{"id":599,"date":"2018-10-17T00:13:07","date_gmt":"2018-10-16T16:13:07","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=599"},"modified":"2018-10-17T00:13:07","modified_gmt":"2018-10-16T16:13:07","slug":"chapter-25-3-residual-stress-china-injection-mold","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/ro\/2018\/10\/17\/capitolul-25-3-tensiuni-reziduale-in-matritele-de-injectie-din-portelan\/","title":{"rendered":"Capitolul 25-3, Tensiuni reziduale, matri\u021b\u0103 de injec\u021bie din por\u021belan"},"content":{"rendered":"
\n
\n
Capitolul 25-3, Tensiuni reziduale, matri\u021b\u0103 de injec\u021bie din por\u021belan
\nAcas\u0103<\/a>\u00a0\"\u00a0Blog despre tehnologia matri\u021belor<\/a>\u00a0\"\u00a0Centrul de \u0219tiri<\/a>\u00a0\" Capitolul 25-3, Tensiuni reziduale, matri\u021b\u0103 de injec\u021bie din por\u021belan<\/div>\n<\/div>\n<\/div>\n
<\/div>\n

\"\"<\/p>\n

FIGURA 5. Apar tensiuni reziduale variabile \u0219i piesa se deformeaz\u0103 pe m\u0103sur\u0103 ce straturile cu volum specific \u00eenghe\u021bat diferit interac\u021bioneaz\u0103 \u00eentre ele<\/h3>\n

Tensiuni reziduale induse de proces vs. \u00een cavitate<\/h2>\n

Datele privind tensiunile reziduale induse de proces sunt mult mai utile dec\u00e2t datele privind tensiunile reziduale \u00een cavitate pentru simularea turn\u0103rii. \u00cen continuare sunt prezentate defini\u021biile celor doi termeni, \u00eempreun\u0103 cu un exemplu care ilustreaz\u0103 diferen\u021ba dintre ei.<\/p>\n

Tensiuni reziduale induse de proces<\/h3>\n

Dup\u0103 ejectarea piesei, constr\u00e2ngerile din cavitatea matri\u021bei sunt eliberate, iar piesa este liber\u0103 s\u0103 se mic\u0219oreze \u0219i s\u0103 se deformeze. Dup\u0103 ce se stabilizeaz\u0103 la o stare de echilibru, tensiunea r\u0103mas\u0103 \u00een interiorul piesei se nume\u0219te tensiune rezidual\u0103 indus\u0103 de proces sau, pur \u0219i simplu, tensiune rezidual\u0103. Tensiunea rezidual\u0103 indus\u0103 de proces poate fi indus\u0103 de flux sau de temperatur\u0103, aceasta din urm\u0103 fiind componenta dominant\u0103.<\/p>\n

Tensiune rezidual\u0103 \u00een cavitate<\/h3>\n

\u00cen timp ce piesa este \u00eenc\u0103 constr\u00e2ns\u0103 \u00een cavitatea matri\u021bei, tensiunea intern\u0103 care se acumuleaz\u0103 \u00een timpul solidific\u0103rii este denumit\u0103 tensiune rezidual\u0103 \u00een cavitate. Aceast\u0103 tensiune rezidual\u0103 \u00een cavitate este for\u021ba care determin\u0103 contrac\u021bia \u0219i deformarea piesei dup\u0103 ejec\u021bie.<\/p>\n

Exemplu<\/h3>\n

Distribu\u021bia contrac\u021biei descris\u0103 \u00een deformarea datorat\u0103 contrac\u021biei diferen\u021biale conduce la un profil de tensiuni reziduale induse termic pentru o pies\u0103 ejectat\u0103, dup\u0103 cum se arat\u0103 \u00een figura din st\u00e2nga jos de mai jos. Profilul de tensiune din figura din st\u00e2nga sus este tensiunea rezidual\u0103 \u00een cavitate, \u00een care piesa turnat\u0103 r\u0103m\u00e2ne constr\u00e2ns\u0103 \u00een matri\u021b\u0103 \u00eenainte de ejectare. Odat\u0103 ce piesa este ejectat\u0103 \u0219i for\u021ba de constr\u00e2ngere din matri\u021b\u0103 este eliberat\u0103, piesa se va contracta \u0219i se va deforma pentru a elibera tensiunea rezidual\u0103 \u00eencorporat\u0103 (\u00een general tensiunea de trac\u021biune, dup\u0103 cum se arat\u0103) \u0219i pentru a atinge o stare de echilibru. Starea de echilibru \u00eenseamn\u0103 c\u0103 nu exist\u0103 nicio for\u021b\u0103 extern\u0103 care s\u0103 se exercite asupra piesei, iar tensiunile de trac\u021biune \u0219i compresiune pe sec\u021biunea transversal\u0103 a piesei ar trebui s\u0103 se echilibreze reciproc. Figurile din partea dreapt\u0103 corespund cazului \u00een care r\u0103cirea este neuniform\u0103 pe toat\u0103 grosimea piesei \u0219i, prin urmare, determin\u0103 o distribu\u021bie asimetric\u0103 a tensiunilor reziduale.<\/p>\n

\"Profilul<\/p>\n

FIGURA 6. Profilul tensiunii reziduale \u00een cavitate (sus) vs. profilul tensiunii reziduale induse de proces \u0219i forma piesei dup\u0103 ejec\u021bie (jos).<\/p>\n

Reducerea tensiunilor reziduale induse termic<\/h2>\n

Condi\u021biile care conduc la o compactare suficient\u0103 \u0219i la temperaturi mai uniforme ale pere\u021bilor matri\u021bei vor reduce tensiunile reziduale induse termic. Acestea includ:
\n- Presiunea \u0219i durata de ambalare corespunz\u0103toare
\n- R\u0103cirea uniform\u0103 a tuturor suprafe\u021belor piesei
\n- Grosimea uniform\u0103 a sec\u021biunii peretelui<\/p>","protected":false},"excerpt":{"rendered":"

Chapter 25-3, Residual stress, china injection mold Home\u00a0\u00bb\u00a0Mould Technology Blog\u00a0\u00bb\u00a0News Center\u00a0\u00bb Chapter 25-3, Residual stress, china injection mold FIGURE 5.\u00a0Variable residual stresses arise and the part deforms as layers of different frozen-in specific volume interact with each other Process-induced vs. in-cavity residual stress Process-induced residual stress data are much more useful than in-cavity residual stress […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-599","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"\nChapter 25-3, Residual stress, china injection mold - Plastic Mold | China Mold Maker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.plasticmoldco.com\/ro\/2018\/10\/17\/\u03ba\u03b5\u03c6\u03ac\u03bb\u03b1\u03b9\u03bf-25-3-\u03c5\u03c0\u03bf\u03bb\u03b5\u03b9\u03bc\u03bc\u03b1\u03c4\u03b9\u03ba\u03ad\u03c2-\u03c4\u03ac\u03c3\u03b5\u03b9\u03c2-\u03c3\u03b5-\u03ba\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-3, Residual stress, china injection mold - 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