{"id":17959,"date":"2025-01-24T20:07:21","date_gmt":"2025-01-24T20:07:21","guid":{"rendered":"https:\/\/aludiecasting.com\/?p=17959"},"modified":"2025-03-22T06:12:54","modified_gmt":"2025-03-22T06:12:54","slug":"optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune","status":"publish","type":"post","link":"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/","title":{"rendered":"Op\u021biuni de finisare a suprafe\u021bei de turnare sub presiune"},"content":{"rendered":"<p>Piesele turnate sub presiune produc adesea piese cu suprafe\u021be rugoase. Pentru a \u00eembun\u0103t\u0103\u021bi aceste suprafe\u021be, produc\u0103torii utilizeaz\u0103 mai multe op\u021biuni de finisare a suprafe\u021belor de turnare. Ei folosesc prelucrarea pentru a \u00eendep\u0103rta reziduurile, \u0219lefuirea pentru o precizie mai bun\u0103, lustruirea pentru suprafe\u021be netede \u0219i lucioase etc.<\/p>\n<p>Electroplacarea adaug\u0103 un strat metalic str\u0103lucitor pentru a opri rugina \u0219i a le face s\u0103 arate mai frumos. Acoperirea cu pulbere pulverizeaz\u0103 pudr\u0103 colorat\u0103 care se coace tare pentru un finisaj rezistent. Anodizarea face piesele din aluminiu foarte rezistente \u0219i le \u00eempiedic\u0103 s\u0103 rugineasc\u0103. Vopsirea adaug\u0103 culoare \u0219i protejeaz\u0103 piesele. \u0218lefuirea face piesele netede \u0219i lucioase.<\/p>\n<p>\u00cen acest articol, afla\u021bi mai multe op\u021biuni de finisare a suprafe\u021bei pentru a cre\u0219te calitatea \u0219i aspectul pieselor turnate \u00een profunzime.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Tabla de con\u021binut<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Tabelul de con\u021binut\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #7c7c7c;color:#7c7c7c\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #7c7c7c;color:#7c7c7c\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Surface_Finishing_Options\" >Op\u021biuni de finisare a suprafe\u021bei<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#A_Mechanical_Finishing_Methods\" >A. Metode mecanice de finisare<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#1_Machining\" >1. Prelucrarea<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Tool_Materials\" >Materiale pentru scule:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Tool_Wear_and_Its_Effects\" >Uzura sculelor \u0219i efectele acesteia:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#2_Grinding\" >2. Rectificare<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Abrasives\" >Abrazivi:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Coolants\" >Lichide de r\u0103cire:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#3_Polishing\" >3. Lustruire<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#B_Chemical_Finishing_Methods\" >B. Metode de finisare chimic\u0103<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Chemical_Etching\" >Gravur\u0103 chimic\u0103<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Chemical_Milling\" >Mor\u0103rit chimic<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Pickling\" >Murare<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#C_Coating_and_Plating_Methods\" >C. Metode de acoperire \u0219i placare<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#1_Painting\" >1.   Vopsire<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#2_Plating\" >2.   Placare<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#3_Powder_Coating\" >3.   Acoperire cu pulbere<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#4_Anodizing\" >4. Anodizare<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Advanced_Surface_Finishing_Techniques\" >Tehnici avansate de finisare a suprafe\u021belor<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#1_Laser_Polishing\" >1.   Lustruire cu laser<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Electrochemical_Polishing\" >Lustruire electrochimic\u0103<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Ultrasonic_Finishing\" >Finisare cu ultrasunete<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Casting_Defects_Causes_Types_and_Prevention\" >Defecte de turnare: Cauze, tipuri \u0219i prevenire<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#1_Porosity\" >1. Porozitatea<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Gas_Porosity\" >Porozitatea gazului:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Sand_Porosity\" >Porozitatea nisipului:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Prevention\" >Prevenire:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#2_Shrinkage\" >2. Mic\u0219orarea<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Prevention-2\" >Prevenire<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#3_Rough_Surfaces\" >3. Suprafe\u021be rugoase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Surface_roughness\" >Rugozitatea suprafe\u021bei:<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Prevention-3\" >Prevenire<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Considerations_for_Choosing_a_Surface_Finishing_Option\" >Considera\u021bii pentru alegerea unei op\u021biuni de finisare a suprafe\u021bei<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/aludiecasting.com\/ro\/optiuni-de-finisare-a-suprafetelor-de-turnare-sub-presiune\/#Conclusion\" >Concluzie:<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Surface_Finishing_Options\"><\/span>Op\u021biuni de finisare a suprafe\u021bei<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-finish-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17960 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-finish-1-1024x1024.jpg\" alt=\"finisarea suprafe\u021bei de turnare\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-finish-1-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-finish-1-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-finish-1-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<h3><span class=\"ez-toc-section\" id=\"A_Mechanical_Finishing_Methods\"><\/span>A. Metode mecanice de finisare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Produc\u0103torii utilizeaz\u0103 metode mecanice de finisare. Aceste metode ajut\u0103 la cre\u0219terea preciziei dimensionale \u0219i a calit\u0103\u021bii pieselor turnate. Ele \u00eendep\u0103rteaz\u0103 reziduurile metalice, netezesc suprafa\u021ba \u0219i \u00eembun\u0103t\u0103\u021besc caracteristicile finale ale piesei.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"1_Machining\"><\/span>1. Prelucrarea<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Procesul de prelucrare include unelte de t\u0103iere. Aceste unelte sunt utilizate pentru a modela o pies\u0103 prin \u00eendep\u0103rtarea materialului. Metodele comune de prelucrare sunt:<\/p>\n<ul>\n<li><strong>\u00centoarcerea<\/strong>: Produc\u0103torul utilizeaz\u0103 unelte de t\u0103iere pentru a t\u0103ia excesul de metal \u00een timp ce rote\u0219te piesa turnat\u0103. Aceast\u0103 metod\u0103 func\u021bioneaz\u0103 bine pentru piesele cilindrice. Ea ajut\u0103 la ob\u021binerea unei precizii dimensionale de \u00b10,05 mm.<\/li>\n<li><strong>Frezare<\/strong>: O frez\u0103 rotativ\u0103 \u00eendep\u0103rteaz\u0103 materialul atunci c\u00e2nd men\u021bine\u021bi piesa \u00eentr-o stare sta\u021bionar\u0103. Prin frezare se pot realiza forme foarte dure \u0219i se poate ob\u021bine o precizie de p\u00e2n\u0103 la \u00b10,02 mm.<\/li>\n<li><strong>Forare<\/strong>: Pute\u021bi utiliza o ma\u0219in\u0103 de g\u0103urit pentru a face g\u0103uri \u00een piese. \u00cen general, burghiurile pot crea g\u0103uri cu diametre de p\u00e2n\u0103 la 0,5 mm. Toleran\u021ba acestor g\u0103uri variaz\u0103 de la \u00b10,05 mm la \u00b10,1 mm, \u00een func\u021bie de dimensiune.<\/li>\n<li><strong>Plictisitor<\/strong>: Procesul de g\u0103urire este potrivit pentru extinderea g\u0103urilor existente. Acesta ofer\u0103 o precizie de \u00b10,01 mm.<\/li>\n<li><strong>Modelare \u0219i rabotare<\/strong>: Aceste tehnici sunt utilizate pentru a efectua ac\u021biuni de t\u0103iere dreapt\u0103 \u0219i pentru a realiza suprafe\u021be netede. Ele ofer\u0103 o precizie de aproximativ \u00b10,1 mm.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Tool_Materials\"><\/span>Materiale pentru scule:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Alegerea uneltelor depinde de metalul turnat \u0219i de standardele de finisare. Pute\u021bi alege <a href=\"https:\/\/en.wikipedia.org\/wiki\/High-speed_steel\" target=\"_blank\" rel=\"noopener\">O\u021bel de mare vitez\u0103<\/a> (HSS) pentru metale moi. Acesta ofer\u0103 o vitez\u0103 de t\u0103iere de p\u00e2n\u0103 la 30-40 m\/min. Sculele din carbur\u0103 sunt op\u021biuni bune pentru materiale dure \u0219i rezistente. Aceste scule ofer\u0103 viteze de 150-300 m\/min.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Tool_Wear_and_Its_Effects\"><\/span>Uzura sculelor \u0219i efectele acesteia:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Uneltele se uzeaz\u0103 adesea din cauza utiliz\u0103rii repetate pentru o perioad\u0103 lung\u0103 de timp. Uneltele defecte cauzeaz\u0103 suprafe\u021be rugoase \u0219i inexactit\u0103\u021bi dimensionale. De asemenea, acestea cresc riscul de defecte. Prin urmare, \u00eentre\u021binerea corespunz\u0103toare a sculelor este important\u0103 pentru a evita aceste efecte.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Grinding\"><\/span>2. Rectificare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-grinding.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17962 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-grinding-1024x1024.jpg\" alt=\"suprafa\u021ba de rectificare \u00een turnarea sub presiune\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-grinding-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-grinding-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/surface-grinding-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<p>Rectificarea este o tehnic\u0103 de finisare. Aceasta utilizeaz\u0103 discuri abrazive care netezesc suprafa\u021ba unei piese. Diferitele metode eficiente de rectificare includ:<\/p>\n<ul>\n<li><strong>\u0218lefuirea suprafe\u021belor<\/strong>:<\/li>\n<\/ul>\n<p>Ofer\u0103 suprafe\u021be plane \u0219i poate atinge toleran\u021be de \u00b10,001 mm. Imaginea prezint\u0103 un proces de rectificare a suprafe\u021belor folosind un ax orizontal \u0219i o mas\u0103 cu mi\u0219care alternativ\u0103. Aici, rectificarea suprafe\u021belor este clasificat\u0103 \u00een dou\u0103 tipuri:<\/p>\n<ol>\n<li>Rectificarea transversal\u0103: Roata de \u0219lefuit se deplaseaz\u0103 dintr-o parte \u00een alta a suprafe\u021bei.<\/li>\n<li>\u0218lefuirea prin plonjare: Roata coboar\u0103 direct \u00een material.<\/li>\n<\/ol>\n<ul>\n<li><strong>Rectificare cilindric\u0103<\/strong>: Produc\u0103torii utilizeaz\u0103 aceast\u0103 metod\u0103 pentru piese cu forme cilindrice \u0219i ob\u021bin toleran\u021be de \u00b10,002 mm.<\/li>\n<li><strong>Rectificare f\u0103r\u0103 centru<\/strong>: Aceast\u0103 metod\u0103 este ideal\u0103 pentru realizarea de piese rotunde precise. Se ob\u021bin toleran\u021be str\u00e2nse de \u00b10,001 mm.<\/li>\n<li><strong>\u0218lefuirea prin alunecare<\/strong>: Produc\u0103torii \u00eendep\u0103rteaz\u0103 reziduurile de la t\u0103ieturile ad\u00e2nci \u00een materiale mai dure folosind aceast\u0103 tehnic\u0103. Aceasta le permite s\u0103 ob\u021bin\u0103 o toleran\u021b\u0103 de \u00b10,002 mm.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Abrasives\"><\/span>Abrazivi:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Abrazivul este un fel de material granulos. Acesta este utilizat de fapt pentru t\u0103iere sau frecare \u00een timpul \u0219lefuirii \u0219i se bazeaz\u0103 pe metalul care este \u0219lefuit. De exemplu, produc\u0103torii folosesc oxid de aluminiu pentru o\u021beluri cu o dimensiune a granulelor de 60-120. Pentru materialele mai dure (ceramic\u0103), ace\u0219tia folosesc carbur\u0103 de siliciu cu granula\u021bii de 120-240.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Coolants\"><\/span>Lichide de r\u0103cire:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Lichidele de r\u0103cire sunt importante pentru a proteja piesele de deteriorarea termic\u0103. Acestea controleaz\u0103 temperatura pieselor \u0219i a ro\u021bilor de rectificat. De asemenea, lichidele de r\u0103cire reduc uzura ro\u021bilor, deoarece asigur\u0103 lubrifierea \u0219i faciliteaz\u0103 \u00eendep\u0103rtarea a\u0219chiilor. Tipurile comune de agen\u021bi de r\u0103cire includ uleiuri solubile \u00een ap\u0103 \u0219i agen\u021bi de r\u0103cire sintetici.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Polishing\"><\/span>3. Lustruire<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Fabrican\u021bii de piese turnate sub presiune \u00eembun\u0103t\u0103\u021besc suprafe\u021bele produselor finale folosind metode de lustruire. Aceste metode creeaz\u0103 un aspect str\u0103lucitor \u0219i estetic al pieselor, precum \u0219i le sporesc durata de via\u021b\u0103. Tipurile de lustruire includ:<\/p>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/polishing.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17963 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/polishing-1024x1024.jpg\" alt=\"lustruire chimic\u0103\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/polishing-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/polishing-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/polishing-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<ul>\n<li><strong>\u0218lefuire<\/strong>: Acest proces utilizeaz\u0103 ro\u021bi de \u0219lefuit a c\u0103ror vitez\u0103 variaz\u0103 de la 2000 la 4000 RPM. Aceasta este produs\u0103 cu materiale din p\u00e2nz\u0103 sau p\u00e2sl\u0103. Produc\u0103torii netezesc suprafe\u021bele cu aceste ro\u021bi. Ei aplic\u0103 adesea metode abrazive \u0219i neabrazive pentru finisarea ulterioar\u0103.<\/li>\n<li><strong>Lustruire chimic\u0103<\/strong>:<\/li>\n<\/ul>\n<p>O unealt\u0103 rotativ\u0103 (o bil\u0103 de uretan) neteze\u0219te suprafa\u021ba unei piese de prelucrat \u00een cadrul acestei metode. Unealta exercit\u0103 presiune prin intermediul unui suport cu arc. Produc\u0103torul curge suspensie sub unealt\u0103. Care lustruiesc suprafa\u021ba prin ac\u021biune chimic\u0103 \u0219i mecanic\u0103.<\/p>\n<ul>\n<li><strong>Lapare<\/strong>: Laparea presupune utilizarea de abrazivi fini (past\u0103 de diamant). Acest proces ofer\u0103 suprafe\u021be netede superioare. Poate fi utilizat pentru piese de \u00eenalt\u0103 precizie pentru a ob\u021bine finisaje cu valori RA chiar mai mici de 0,01 \u00b5m.<\/li>\n<li><strong>Cizelare<\/strong>: Metodele de honuire func\u021bioneaz\u0103 bine la finisajele suprafe\u021belor interne, cum ar fi alezajele cilindrilor. Aceasta utilizeaz\u0103 pietre abrazive. Aceasta \u00eendep\u0103rteaz\u0103 reziduurile \u0219i ofer\u0103 un finisaj precis \u0219i neted. Honuirea ofer\u0103 toleran\u021be de aproximativ \u00b10,01 mm p\u00e2n\u0103 la \u00b10,02 mm, \u00een func\u021bie de material.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"B_Chemical_Finishing_Methods\"><\/span>B. Metode de finisare chimic\u0103<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Chemical_Etching\"><\/span>Gravur\u0103 chimic\u0103<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Gravarea chimic\u0103 \u00eendep\u0103rteaz\u0103 anumite zone de pe o pies\u0103 folosind agen\u021bi de gravur\u0103. De exemplu, produc\u0103torii folosesc clorur\u0103 feric\u0103 pentru cupru \u0219i acid nitric pentru o\u021bel. Ace\u0219tia folosesc aceast\u0103 tehnologie pentru desene metalice complicate \u00een electronice (PCB) \u0219i piese decorative. Ad\u00e2ncimile de gravur\u0103 variaz\u0103 de la 0,01 la 0,5 mm, \u00een func\u021bie de metal \u0219i de timpul de expunere.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Chemical_Milling\"><\/span>Mor\u0103rit chimic<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Frezarea chimic\u0103 \u00eendep\u0103rteaz\u0103 cantitatea controlat\u0103 de material prin <a href=\"https:\/\/en.wikipedia.org\/wiki\/Chemical_milling\" target=\"_blank\" rel=\"noopener\">gravur\u0103 chimic\u0103<\/a>. \u00cendep\u0103rtarea materialului variaz\u0103 de la 0,1 la 2 mm, \u00een func\u021bie de necesit\u0103\u021bile componentei.<\/p>\n<p>\u00cen plus, nu este nevoie de unelte mecanice, deoarece aceast\u0103 metod\u0103 poate crea forme complexe f\u0103r\u0103 acestea. Pute\u021bi utiliza aceast\u0103 metod\u0103 pentru industriile aerospa\u021bial\u0103 \u0219i auto.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Pickling\"><\/span>Murare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Decaparea \u00eendep\u0103rteaz\u0103 oxizii, calcarul \u0219i rugina pentru a cur\u0103\u021ba suprafe\u021bele metalice. Se folose\u0219te imersia \u00een solu\u021bii acide. De exemplu, acid clorhidric sau acid sulfuric.<\/p>\n<p>Decaparea poate cur\u0103\u021ba cu ad\u00e2ncimi cuprinse \u00eentre 0,05 \u0219i 0,3 mm. Totu\u0219i, aceasta depinde de acidul utilizat \u0219i de timpul de imersie. Pute\u021bi utiliza acest proces pentru a preg\u0103ti suprafe\u021bele metalice pentru galvanoplastie, vopsire sau sudare.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"C_Coating_and_Plating_Methods\"><\/span>C. Metode de acoperire \u0219i placare<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Painting\"><\/span>1.   Vopsire<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Vopsirea utilizeaz\u0103 mai multe tipuri de acoperire. De exemplu, pe baz\u0103 de solvent, pe baz\u0103 de ap\u0103 \u0219i acoperiri cu pulbere. \u00cenainte de vopsire, preg\u0103tirea adecvat\u0103 a suprafe\u021bei \u0219i cur\u0103\u021benia (peste 95%) sunt importante pentru o mai bun\u0103 aderen\u021b\u0103. Aceasta include degresarea \u0219i fosfatarea.<\/p>\n<p>Pute\u021bi vopsi piesa folosind vopsirea prin pulverizare, acoperirea prin imersie sau pulverizarea electrostatic\u0103. Utiliza\u021bi-le \u00een func\u021bie de tipul de material \u0219i de nevoile de finisare.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Plating\"><\/span>2.   Placare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Placarea se refer\u0103 la procesul de acoperire a metalului prin galvanoplastie \u0219i galvanoplastie f\u0103r\u0103 curent electric. \u00cen special, electroliza depune metale precum cromul, nichelul sau aurul \u00een galvanoplastie. \u00cen acela\u0219i timp, placarea f\u0103r\u0103 curent electric ofer\u0103 acoperiri uniforme f\u0103r\u0103 a necesita curent extern.<\/p>\n<p>Grosimea plac\u0103rii variaz\u0103 \u00eentre 0,005-0,25 mm. Rezist\u0103 la rugin\u0103 \u0219i uzur\u0103 \u0219i ofer\u0103 finisaje decorative pentru industrii precum cea auto \u0219i electronic\u0103.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Powder_Coating\"><\/span>3.   Acoperire cu pulbere<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Acoperirea cu pulbere utilizeaz\u0103 pudr\u0103 \u00eenc\u0103rcat\u0103 negativ pentru a se aplica pe piesele de prelucrat \u00eemp\u0103m\u00e2ntate. Produc\u0103torii \u00eenc\u0103lzesc articolul la o temperatur\u0103 cuprins\u0103 \u00eentre 160\u00b0C \u0219i 200\u00b0C. Aceasta face ca pulberea s\u0103 formeze un finisaj neted.<\/p>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/powder-coating.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17964 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/powder-coating-1024x1024.jpg\" alt=\"finisare de suprafa\u021b\u0103 acoperire cu pulbere\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/powder-coating-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/powder-coating-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/powder-coating-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<p>Acoperirea cu pulbere dureaz\u0103 mai mult, previne coroziunea \u0219i este ecologic\u0103. Aceasta este potrivit\u0103 pentru piese auto, aparate \u0219i mobilier.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"4_Anodizing\"><\/span>4. Anodizare<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/maxresdefault-1-1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17984 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/maxresdefault-1-1-1024x455.jpg\" alt=\"procesul de anodizare\" width=\"1024\" height=\"455\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/maxresdefault-1-1-1024x455.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/maxresdefault-1-1-980x435.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/maxresdefault-1-1-480x213.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<p>Anodizarea finisajului de suprafa\u021b\u0103 este un proces care modific\u0103 suprafa\u021ba unui metal. Acesta utilizeaz\u0103 electricitate \u0219i o baie chimic\u0103. Aceasta creeaz\u0103 un strat mai gros pe suprafa\u021ba metalului. Noul strat este mai rezistent la coroziune \u0219i uzur\u0103. Anodizarea poate schimba \u0219i aspectul metalului. Aluminiul este metalul cel mai des anodizat. Procesul este utilizat \u00een multe industrii, cum ar fi industria aerospa\u021bial\u0103, industria auto \u0219i construc\u021bii.<\/p>\n<p>Pute\u021bi merge la <a href=\"https:\/\/aludiecasting.com\/ro\/anodizare-aluminiu-turnat\/\">anodizare aluminiu turnat<\/a> pagin\u0103 pentru a afla mai multe despre finisajul suprafe\u021bei de anodizare a aluminiului.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Advanced_Surface_Finishing_Techniques\"><\/span>Tehnici avansate de finisare a suprafe\u021belor<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Laser_Polishing\"><\/span>1.   Lustruire cu laser<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0218lefuirea cu laser \u00eembun\u0103t\u0103\u021be\u0219te suprafe\u021bele metalice fabricate aditiv. Aceasta creeaz\u0103 urme unice strat cu strat pentru a \u00eembun\u0103t\u0103\u021bi finisajul suprafe\u021bei \u0219i a reduce rugozitatea.<\/p>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/laser-polishing.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17965 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/laser-polishing-1024x1024.jpg\" alt=\"\u0219lefuire cu laser\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/laser-polishing-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/laser-polishing-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/laser-polishing-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<p>O raz\u0103 laser gaussian\u0103 scaneaz\u0103 \u00eentr-o anumit\u0103 direc\u021bie. Acestea topesc \u0219i netezesc stratul de material. Acest punct laser se suprapune cu o spa\u021biere a trapei de 0,1-0,5 mm pentru consecven\u021b\u0103.<\/p>\n<p>\u0218lefuirea cu laser utilizeaz\u0103 raze laser de mare energie pentru a lichefia \u0219i resolidifica stratul de suprafa\u021b\u0103. Aceasta ofer\u0103 o precizie de p\u00e2n\u0103 la \u00b10,1 \u00b5m. Acest proces este preferabil pentru forme \u0219i dispozitive dure, cum ar fi implanturile medicale, piesele aerospa\u021biale \u0219i optica de precizie.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Electrochemical_Polishing\"><\/span>Lustruire electrochimic\u0103<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u0218lefuirea electrochimic\u0103 (ECP) utilizeaz\u0103 electricitatea. Aceasta neteze\u0219te \u0219i rafineaz\u0103 suprafa\u021ba pieselor metalice cu o rezisten\u021b\u0103 la coroziune de 80-95%.<\/p>\n<p>Acest proces este asem\u0103n\u0103tor electroplac\u0103rii inverse. Deoarece produc\u0103torii \u00eendep\u0103rteaz\u0103 un strat sub\u021bire \u00een loc s\u0103 adauge metal. Astfel \u00eenc\u00e2t s\u0103 ob\u021bin\u0103 un finisaj foarte lustruit.<\/p>\n<p>ECP este ideal pentru dispozitive medicale, palete de turbine \u0219i piese aerospa\u021biale.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Ultrasonic_Finishing\"><\/span>Finisare cu ultrasunete<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Finisarea cu ultrasunete utilizeaz\u0103 unde sonore de \u00eenalt\u0103 frecven\u021b\u0103. Aceste unde creeaz\u0103 vibra\u021bii \u00eentr-o suspensie de particule abrazive \u0219i un metal lichid. Vibra\u021biile agit\u0103 particulele abrazive pentru a bombarda suprafa\u021ba piesei. Acest lucru \u00eendep\u0103rteaz\u0103 metalul \u0219i determin\u0103 un rezultat mai bine lustruit.<\/p>\n<p>Prelucrarea cu ultrasunete poate ob\u021bine un finisaj de suprafa\u021b\u0103 de p\u00e2n\u0103 la 0,1-0,3 \u00b5m. Este eficient\u0103 pentru debavurare, lustruire \u0219i \u00eendep\u0103rtarea contaminan\u021bilor din forme complicate.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Casting_Defects_Causes_Types_and_Prevention\"><\/span>Defecte de turnare: Cauze, tipuri \u0219i prevenire<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Porosity\"><\/span>1. Porozitatea<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Porozitatea arat\u0103 ca ni\u0219te g\u0103uri mici sau goluri. Aceasta se formeaz\u0103 \u00een interiorul metalului \u0219i \u00eel sl\u0103be\u0219te. Motivele apari\u021biei sale sunt:<\/p>\n<ul>\n<li>Manipularea necorespunz\u0103toare a metalului topit<\/li>\n<li>Factori de mediu<\/li>\n<li>Probleme legate de mucegai (vechi sau deteriorate)<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Gas_Porosity\"><\/span>Porozitatea gazului:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Porozitatea gazelor apare \u00een timpul solidific\u0103rii. Gaze precum hidrogenul, azotul sau oxigenul p\u0103trund sau se amestec\u0103 cu metalele. Aceste gaze se acumuleaz\u0103 \u00een interior \u0219i formeaz\u0103 bule. De exemplu, hidrogenul \u00een aluminiu prezint\u0103 o solubilitate de 0,69 cm\u00b3\/100g la 660\u00b0C. Aceasta se reduce la 0,034 cm\u00b3\/100g atunci c\u00e2nd metalul devine solid.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Sand_Porosity\"><\/span>Porozitatea nisipului:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Porozitatea nisipului apare \u00een procesul de turnare cu nisip. Unele boabe de nisip sau gaze din matri\u021be se amestec\u0103 cu metalul topit.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Prevention\"><\/span>Prevenire:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Produc\u0103torii degazeaz\u0103 cu argon sau topesc metalul \u00een vid pentru a elimina gazele captive.<\/p>\n<p>Pentru a preveni porozitatea nisipului, este important s\u0103 se utilizeze nisip cu granula\u021bie fin\u0103 cu permeabilitate sc\u0103zut\u0103. De asemenea, umiditatea ar trebui s\u0103 fie aplicat\u0103 pe matri\u021ba de nisip. Aceste m\u0103suri pot reduce defectele cu 3 p\u00e2n\u0103 la 5%.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"2_Shrinkage\"><\/span>2. Mic\u0219orarea<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Atunci c\u00e2nd metalul devine solid, acesta se contract\u0103 neuniform, l\u0103s\u00e2nd goluri \u00een interior, cunoscute sub numele de porozitate de contrac\u021bie. Aceasta este o problem\u0103 comun\u0103 \u0219i apare adesea \u00een <a href=\"https:\/\/aludiecasting.com\/ro\/aluminiu-turnat-sub-presiune-3\/\">aluminiu turnat sub presiune<\/a>. Acest aliaj se poate contracta p\u00e2n\u0103 la 6,6% \u00een volum. Diver\u0219ii factori influen\u021beaz\u0103 contrac\u021bia, cum ar fi:<\/p>\n<ul>\n<li>Rata de r\u0103cire<\/li>\n<li>Tip metalic<\/li>\n<li>Design de turnare<\/li>\n<\/ul>\n<p><a href=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/shrinkage-porosity.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-17961 size-large\" src=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/shrinkage-porosity-1024x1024.jpg\" alt=\"contrac\u021bia turn\u0103rii sub presiune\" width=\"1024\" height=\"1024\" title=\"\" srcset=\"https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/shrinkage-porosity-1024x1024.jpg 1024w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/shrinkage-porosity-980x980.jpg 980w, https:\/\/aludiecasting.com\/wp-content\/uploads\/2025\/01\/shrinkage-porosity-480x480.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/a><\/p>\n<p>De exemplu, o rat\u0103 de r\u0103cire mai mare pentru aluminiu (30 \u00b0C\/min) provoac\u0103 fisuri. \u00cen acela\u0219i timp, 5 \u00b0C\/min asigur\u0103 o structur\u0103 uniform\u0103.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Prevention-2\"><\/span>Prevenire<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Pute\u021bi utiliza alimentatoare pentru a ad\u0103uga metal topit suplimentar \u00een timpul solidific\u0103rii pentru a evita contrac\u021bia. \u00cen plus, men\u021bine\u021bi constant\u0103 temperatura de turnare. De exemplu, 650-700\u00b0C pentru aluminiu. Proiecta\u021bi o matri\u021b\u0103 uniform\u0103. De asemenea, aplica\u021bi r\u0103ciri pentru sec\u021biunile mai groase. Aceste r\u0103ciri accelereaz\u0103 procesul de solidificare \u0219i minimizeaz\u0103 contrac\u021bia.<\/p>\n<p>Aceast\u0103 imagine arat\u0103 porozitatea de contrac\u021bie. Aceasta este redus\u0103 \u00een timpul solidific\u0103rii presurizate. Pute\u021bi vedea diferen\u021ba dintre sec\u021biunile experimentului \u0219i simul\u0103rii. O scar\u0103 de culori demonstreaz\u0103 nivelul porozit\u0103\u021bii totale de contrac\u021bie. De exemplu, albastrul este zero, sec\u021biunea verde eviden\u021biat\u0103 este \u00een jur de 40 p\u00e2n\u0103 la 50, iar cavitatea de contrac\u021bie ro\u0219ie arat\u0103 contrac\u021bia 100%.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"3_Rough_Surfaces\"><\/span>3. Suprafe\u021be rugoase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Suprafe\u021bele rugoase se refer\u0103 la imperfec\u021biuni. Acest aspect afecteaz\u0103 aspectul \u0219i performan\u021ba pieselor turnate. Acestea se formeaz\u0103 din cauza:<\/p>\n<ul>\n<li><strong>Rugozitatea matri\u021bei<\/strong>: Suprafe\u021bele neuniforme ale matri\u021bei provoac\u0103 rugozitatea matri\u021bei, adesea din cauza <strong>grosier<\/strong> granule de nisip. De exemplu, matri\u021bele cu AFS GFN &lt;50 fac suprafe\u021bele foarte aspre.<\/li>\n<li><strong>Incluziuni de nisip<\/strong>: C\u00e2nd produc\u0103torii toarn\u0103 metal topit \u00een matri\u021ba de nisip, mai multe boabe de nisip libere se lipesc de metalul topit \u0219i afecteaz\u0103 finisajul suprafe\u021bei.<\/li>\n<li><strong>Eroziune: <\/strong>O vitez\u0103 a metalului topit mai mare de 2 m\/s formeaz\u0103 eroziune.<\/li>\n<\/ul>\n<h3><span class=\"ez-toc-section\" id=\"Surface_roughness\"><\/span>Rugozitatea suprafe\u021bei:<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Pute\u021bi m\u0103sura rugozitatea suprafe\u021bei cu instrumente precum profilometrele. Rugozitatea medie (Ra) pentru piesele turnate cu nisip se situeaz\u0103 de obicei \u00eentre 6-25 \u00b5m. \u00cen acela\u0219i timp, aceasta variaz\u0103 de la 0,4 la 0,8 \u00b5m pentru piesele lustruite.<\/p>\n<p>Cu toate acestea, Rz (rugozitatea cu varia\u021bii de \u00een\u0103l\u021bime mai mari) pentru piesele turnate \u00een nisip fluctueaz\u0103 \u00eentre 50 \u00b5m sau mai mult.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Prevention-3\"><\/span>Prevenire<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>\u00cembun\u0103t\u0103\u021bi\u021bi calitatea matri\u021bei \u0219i utiliza\u021bi nisip cu granula\u021bie fin\u0103 (de exemplu, AFS GFN &gt;60). Aplica\u021bi acoperiri refractare netede. \u00cen plus, controla\u021bi viteza de turnare la 1,5-2 m\/s pentru a reduce eroziunea. Pentru o atingere final\u0103, pute\u021bi utiliza metode de \u0219lefuire sau lustruire.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Considerations_for_Choosing_a_Surface_Finishing_Option\"><\/span>Considera\u021bii pentru alegerea unei op\u021biuni de finisare a suprafe\u021bei<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Op\u021biunea corect\u0103 de finisare a suprafe\u021bei depinde de mai mul\u021bi factori, dup\u0103 cum se arat\u0103 \u00een tabel. De exemplu, costul, compatibilitatea materialelor, calitatea de finisare dorit\u0103 \u0219i volumul de produc\u021bie. Alege\u021bi-le cu \u00een\u021belepciune pentru a v\u0103 justifica investi\u021biile.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Concluzie:<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Piesele fabricate au adesea suprafe\u021be aspre care trebuie reparate. Suprafe\u021bele rugoase pot ap\u0103rea, de asemenea, din cauza unor defecte precum porozitatea, contrac\u021bia sau uzura matri\u021bei. Oricum, le pute\u021bi repara folosind mai multe op\u021biuni de finisare a suprafe\u021belor. Aceste metode includ \u0219lefuirea, prelucrarea, lustruirea sau acoperirea. Selectarea tehnicilor depinde de modul \u00een care dori\u021bi s\u0103 transforma\u021bi suprafe\u021bele brute \u00een finisaje fine sau de utilizarea aplica\u021biilor.<\/p>","protected":false},"excerpt":{"rendered":"<p>Die castings often produce parts with rough surfaces. To improve these surfaces, manufacturers use several casting surface finishing options. They use machining to remove residues, grinding for better accuracy, polishing for smooth, shiny surfaces, etc. Electroplating adds a shiny metal coat to stop rust and make them look nicer. Powder coating sprays on colored powder [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":17966,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-17959","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aluminium-die-casting"],"_links":{"self":[{"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/posts\/17959","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/comments?post=17959"}],"version-history":[{"count":0,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/posts\/17959\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/media\/17966"}],"wp:attachment":[{"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/media?parent=17959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/categories?post=17959"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aludiecasting.com\/ro\/wp-json\/wp\/v2\/tags?post=17959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}