{"id":519,"date":"2018-10-16T22:06:31","date_gmt":"2018-10-16T14:06:31","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=519"},"modified":"2018-10-20T01:44:19","modified_gmt":"2018-10-19T17:44:19","slug":"alternative-cooling-devices","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/ro\/2018\/10\/16\/dispozitive-alternative-de-racire\/","title":{"rendered":"Dispozitive alternative de r\u0103cire"},"content":{"rendered":"

[et_pb_section bb_built=\"1\u2033 disabled_on=\"on|on|\" _builder_version=\"3.10.2\u2033 custom_padding=\"0|0px|54px|0px|false|false\" next_background_color=\"#000000\u2033][et_pb_row custom_padding=\"0|0px|0|0px|false|false\" _builder_version=\"3.0.48\u2033 background_size=\"initial\" background_position=\"top_left\" background_repeat=\"repeat\"][et_pb_column type=\"4_4\u2033][et_pb_text _builder_version=\"3.10.2\u2033 border_width_all=\"3px\" border_color_all=\"#e5e5e5\u2033]<\/p>\n

Ce fac ei?<\/h1>\n

Deflectoarele \u0219i bulele sunt sec\u021biuni ale conductelor de r\u0103cire care deviaz\u0103 fluxul de agent de r\u0103cire \u00een zone care, \u00een mod normal, nu ar fi r\u0103cite. Canalele de r\u0103cire sunt de obicei forate prin cavitatea \u0219i miezul matri\u021bei. Cu toate acestea, matri\u021ba poate fi alc\u0103tuit\u0103 din zone prea \u00eendep\u0103rtate pentru a g\u0103zdui canale de r\u0103cire obi\u0219nuite. Metodele alternative pentru r\u0103cirea acestor zone \u00een mod uniform cu restul piesei implic\u0103 utilizarea de baffles, Bubblers sau pini termici, dup\u0103 cum se arat\u0103 mai jos.<\/p>\n

\"\"<\/p>\n

FIGURA 1. Baffle, bubbler \u0219i pin termic<\/h3>\n

Baffles<\/h1>\n

Un deflector este de fapt un canal de r\u0103cire forat perpendicular pe conducta principal\u0103 de r\u0103cire, cu o lam\u0103 care separ\u0103 un pasaj de r\u0103cire \u00een dou\u0103 canale semicirculare. Lichidul de r\u0103cire curge \u00eentr-o parte a lamei din conducta principal\u0103 de r\u0103cire, se \u00eentoarce \u00een jurul v\u00e2rfului pe cealalt\u0103 parte a deflectorului, apoi curge \u00eenapoi \u00een conducta principal\u0103 de r\u0103cire.<\/p>\n

Aceast\u0103 metod\u0103 asigur\u0103 sec\u021biuni transversale maxime pentru lichidul de r\u0103cire, dar este dificil s\u0103 se monteze separatorul exact \u00een centru. Efectul de r\u0103cire \u0219i, prin urmare, distribu\u021bia temperaturii pe o parte a miezului pot fi diferite de cele de pe cealalt\u0103 parte. Acest dezavantaj al unei solu\u021bii altfel economice, \u00een ceea ce prive\u0219te fabricarea, poate fi eliminat dac\u0103 foaia de metal care formeaz\u0103 deflectorul este r\u0103sucit\u0103. De exemplu, deflectorul elicoidal, prezentat \u00een figura 2 de mai jos, transport\u0103 agentul de r\u0103cire spre v\u00e2rf \u0219i \u00eenapoi sub forma unei elice. Este util pentru diametre cuprinse \u00eentre 12 \u0219i 50 mm \u0219i asigur\u0103 o distribu\u021bie foarte omogen\u0103 a temperaturii. O alt\u0103 evolu\u021bie logic\u0103 a deflectoarelor sunt miezurile spiralate cu zbor simplu sau dublu, a\u0219a cum se arat\u0103 \u00een figura 2 de mai jos.<\/p>\n

\"\"<\/p>\n

FIGURA 2. (St\u00e2nga) Deflector elicoidal. (Dreapta) Deflector spiralat.<\/h3>\n

Bubbles<\/h1>\n

Un bubbler este similar cu un deflector, cu excep\u021bia faptului c\u0103 lama este \u00eenlocuit\u0103 cu un tub mic. Agentul de r\u0103cire curge \u00een partea de jos a tubului \u0219i \"bolborose\u0219te\" prin partea de sus, la fel ca \u00eentr-o f\u00e2nt\u00e2n\u0103. Lichidul de r\u0103cire curge apoi \u00een jos \u00een jurul exteriorului tubului pentru a-\u0219i continua curgerea prin canalele de r\u0103cire.<\/p>\n

R\u0103cirea cea mai eficient\u0103 a miezurilor sub\u021biri se realizeaz\u0103 cu ajutorul bulelor. Diametrul ambelor trebuie s\u0103 fie ajustat astfel \u00eenc\u00e2t rezisten\u021ba la curgere \u00een ambele sec\u021biuni transversale s\u0103 fie egal\u0103. Condi\u021bia pentru aceasta este:<\/p>\n

Diametru interior \/ Diametru exterior = 0,707<\/p>\n

Bulg\u0103rele sunt disponibile \u00een comer\u021b \u0219i sunt de obicei \u00een\u0219urubate \u00een miez, a\u0219a cum se arat\u0103 \u00een figura 3 de mai jos. P\u00e2n\u0103 la un diametru de 4 mm, tubulatura trebuie s\u0103 fie tivit\u0103 la cap\u0103t pentru a m\u0103ri sec\u021biunea transversal\u0103 a ie\u0219irii; aceast\u0103 tehnic\u0103 este ilustrat\u0103 \u00een figura 3. Bubblers pot fi utilizate nu numai pentru r\u0103cirea miezului, ci sunt, de asemenea, pentru r\u0103cirea sec\u021biunilor plate ale matri\u021bei, care nu pot fi echipate cu canale forate sau frezate.<\/p>\n

\"\"<\/p>\n

FIGURA 3. (St\u00e2nga) Bubblers \u00een\u0219urubate \u00een miez. (Dreapta) Bubbler conic pentru a m\u0103ri ie\u0219irea<\/p>\n

NOT\u0102:<\/strong>\u00a0Deoarece at\u00e2t deflectoarele, c\u00e2t \u0219i bublerii au zone de curgere \u00eenguste, rezisten\u021ba la curgere cre\u0219te. Prin urmare, trebuie s\u0103 se acorde aten\u021bie la proiectarea dimensiunii acestor dispozitive. Comportamentul fluxului \u0219i al transferului de c\u0103ldur\u0103 at\u00e2t pentru deflectoare c\u00e2t \u0219i pentru barbotoare poate fi u\u0219or modelat \u0219i analizat prin analiza C-MOLD Cooling.<\/p>\n

Pini termici<\/h1>\n

Un pin termic este o alternativ\u0103 la deflectoare \u0219i bubler. Este un cilindru etan\u0219 umplut cu un fluid. Fluidul se vaporizeaz\u0103 pe m\u0103sur\u0103 ce extrage c\u0103ldura din o\u021belul de scule \u0219i se condenseaz\u0103 pe m\u0103sur\u0103 ce elibereaz\u0103 c\u0103ldura c\u0103tre lichidul de r\u0103cire, dup\u0103 cum se arat\u0103 \u00een figura 4. Eficien\u021ba transferului de c\u0103ldur\u0103 a unui \u0219tift termic este de aproape zece ori mai mare dec\u00e2t a unui tub de cupru. Pentru o bun\u0103 conduc\u021bie a c\u0103ldurii, evita\u021bi un gol de aer \u00eentre \u0219tiftul termic \u0219i matri\u021b\u0103 sau umple\u021bi-l cu un material de etan\u0219are foarte conductiv.<\/p>\n

\"\"<\/p>\n

FIGURA 4. Eficien\u021ba transferului de c\u0103ldur\u0103 al \u0219tiftului termic<\/h3>\n

R\u0103cirea miezurilor sub\u021biri<\/h1>\n

\u00cen cazul \u00een care diametrul sau l\u0103\u021bimea sunt foarte mici (mai pu\u021bin de 3 mm), numai r\u0103cirea cu aer este posibil\u0103. Aerul este suflat \u00een miezuri din exterior \u00een timpul deschiderii matri\u021bei sau curge prin gaura central\u0103 din interior, a\u0219a cum se arat\u0103 \u00een figura 5. Aceast\u0103 procedur\u0103, desigur, nu permite men\u021binerea unei temperaturi exacte a matri\u021bei.<\/p>\n

\"\"<\/p>\n

FIGURA 5. R\u0103cirea cu aer a unui miez sub\u021bire<\/h3>\n

R\u0103cirea mai bun\u0103 a miezurilor sub\u021biri (cele care m\u0103soar\u0103 mai pu\u021bin de 5 mm) se realizeaz\u0103 prin utilizarea unor inser\u021bii realizate din materiale cu conductivitate termic\u0103 ridicat\u0103, cum ar fi materialele din cupru sau beriliu-cupru. Aceast\u0103 tehnic\u0103 este ilustrat\u0103 \u00een figura 6 de mai jos. Astfel de inser\u021bii sunt montate prin presare \u00een miez \u0219i se extind cu baza lor, care are o sec\u021biune transversal\u0103 c\u00e2t mai mare posibil, \u00eentr-un canal de r\u0103cire.<\/p>\n

\"\"<\/p>\n

FIGURA 6. Utilizarea unui material cu conductivitate termic\u0103 ridicat\u0103 pentru a r\u0103ci un miez sub\u021bire<\/h3>\n

R\u0103cirea nucleelor mari<\/h1>\n

Pentru diametrele mari ale miezului (40 mm \u0219i mai mari), trebuie asigurat un transport pozitiv al agentului de r\u0103cire. Acest lucru poate fi realizat cu inser\u021bii \u00een care agentul de r\u0103cire ajunge la v\u00e2rful miezului printr-un orificiu central \u0219i este condus printr-o spiral\u0103 p\u00e2n\u0103 la circumferin\u021ba acestuia, iar \u00eentre miez \u0219i inser\u021bie \u00een mod elicoidal p\u00e2n\u0103 la ie\u0219ire, dup\u0103 cum se arat\u0103 \u00een figura 7. Acest model sl\u0103be\u0219te semnificativ miezul.<\/p>\n

\"\"<\/p>\n

FIGURA 7. Utilizarea unui deflector elicoidal pentru r\u0103cirea miezului mare<\/h3>\n

R\u0103cirea miezurilor cilindrilor<\/h1>\n

R\u0103cirea miezurilor cilindrilor \u0219i a altor piese rotunde ar trebui s\u0103 se fac\u0103 cu o spiral\u0103 dubl\u0103, a\u0219a cum se arat\u0103 mai jos. Lichidul de r\u0103cire curge spre v\u00e2rful miezului \u00eentr-un helix \u0219i se \u00eentoarce \u00een alt helix. Din motive de proiectare, grosimea peretelui miezului trebuie s\u0103 fie de cel pu\u021bin 3 mm \u00een acest caz.<\/p>\n

\"\"FIGURA 8. Spiral\u0103 dubl\u0103 cu bubbler central<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section bb_built=\"1\u2033 disabled_on=\"||on\" _builder_version=\"3.10.2\u2033 custom_padding=\"0|0px|54px|0px|false|false\" prev_background_color=\"#000000\u2033][et_pb_row custom_padding=\"0|0px|0|0px|false|false\" _builder_version=\"3.0.48\u2033 background_size=\"initial\" background_position=\"top_left\" background_repeat=\"repeat\"][et_pbb_column type=\"4_4\u2033][et_pb_text _builder_version=\"3.10.2\u2033 border_width_all=\"3px\" border_color_all=\"#e5e5e5\u2033]<\/p>\n

Ce fac ei?<\/h1>\n

Deflectoarele \u0219i bulele sunt sec\u021biuni ale conductelor de r\u0103cire care deviaz\u0103 fluxul de agent de r\u0103cire \u00een zone care, \u00een mod normal, nu ar fi r\u0103cite. Canalele de r\u0103cire sunt de obicei forate prin cavitatea \u0219i miezul matri\u021bei. Cu toate acestea, matri\u021ba poate fi alc\u0103tuit\u0103 din zone prea \u00eendep\u0103rtate pentru a g\u0103zdui canale de r\u0103cire obi\u0219nuite. Metodele alternative pentru r\u0103cirea acestor zone \u00een mod uniform cu restul piesei implic\u0103 utilizarea de baffles, Bubblers sau pini termici, dup\u0103 cum se arat\u0103 mai jos.<\/p>\n

\"\"<\/p>\n

FIGURA 1. Baffle, bubbler \u0219i pin termic<\/h3>\n

Baffles<\/h1>\n

Un deflector este de fapt un canal de r\u0103cire forat perpendicular pe conducta principal\u0103 de r\u0103cire, cu o lam\u0103 care separ\u0103 un pasaj de r\u0103cire \u00een dou\u0103 canale semicirculare. Lichidul de r\u0103cire curge \u00eentr-o parte a lamei din conducta principal\u0103 de r\u0103cire, se \u00eentoarce \u00een jurul v\u00e2rfului pe cealalt\u0103 parte a deflectorului, apoi curge \u00eenapoi \u00een conducta principal\u0103 de r\u0103cire.<\/p>\n

Aceast\u0103 metod\u0103 asigur\u0103 sec\u021biuni transversale maxime pentru lichidul de r\u0103cire, dar este dificil s\u0103 se monteze separatorul exact \u00een centru. Efectul de r\u0103cire \u0219i, prin urmare, distribu\u021bia temperaturii pe o parte a miezului pot fi diferite de cele de pe cealalt\u0103 parte. Acest dezavantaj al unei solu\u021bii altfel economice, \u00een ceea ce prive\u0219te fabricarea, poate fi eliminat dac\u0103 foaia de metal care formeaz\u0103 deflectorul este r\u0103sucit\u0103. De exemplu, deflectorul elicoidal, prezentat \u00een figura 2 de mai jos, transport\u0103 agentul de r\u0103cire spre v\u00e2rf \u0219i \u00eenapoi sub forma unei elice. Este util pentru diametre cuprinse \u00eentre 12 \u0219i 50 mm \u0219i asigur\u0103 o distribu\u021bie foarte omogen\u0103 a temperaturii. O alt\u0103 evolu\u021bie logic\u0103 a deflectoarelor sunt miezurile spiralate cu zbor simplu sau dublu, a\u0219a cum se arat\u0103 \u00een figura 2 de mai jos.<\/p>\n

\"\"<\/p>\n

FIGURA 2. (St\u00e2nga) Deflector elicoidal. (Dreapta) Deflector spiralat.<\/h3>\n

Bubbles<\/h1>\n

Un bubbler este similar cu un deflector, cu excep\u021bia faptului c\u0103 lama este \u00eenlocuit\u0103 cu un tub mic. Agentul de r\u0103cire curge \u00een partea de jos a tubului \u0219i \"bolborose\u0219te\" prin partea de sus, la fel ca \u00eentr-o f\u00e2nt\u00e2n\u0103. Lichidul de r\u0103cire curge apoi \u00een jos \u00een jurul exteriorului tubului pentru a-\u0219i continua curgerea prin canalele de r\u0103cire.<\/p>\n

R\u0103cirea cea mai eficient\u0103 a miezurilor sub\u021biri se realizeaz\u0103 cu ajutorul bulelor. Diametrul ambelor trebuie s\u0103 fie ajustat astfel \u00eenc\u00e2t rezisten\u021ba la curgere \u00een ambele sec\u021biuni transversale s\u0103 fie egal\u0103. Condi\u021bia pentru aceasta este:<\/p>\n

Diametru interior \/ Diametru exterior = 0,707<\/p>\n

Bulg\u0103rele sunt disponibile \u00een comer\u021b \u0219i sunt de obicei \u00een\u0219urubate \u00een miez, a\u0219a cum se arat\u0103 \u00een figura 3 de mai jos. P\u00e2n\u0103 la un diametru de 4 mm, tubulatura trebuie s\u0103 fie tivit\u0103 la cap\u0103t pentru a m\u0103ri sec\u021biunea transversal\u0103 a ie\u0219irii; aceast\u0103 tehnic\u0103 este ilustrat\u0103 \u00een figura 3. Bubblers pot fi utilizate nu numai pentru r\u0103cirea miezului, ci sunt, de asemenea, pentru r\u0103cirea sec\u021biunilor plate ale matri\u021bei, care nu pot fi echipate cu canale forate sau frezate.<\/p>\n

\"\"<\/p>\n

FIGURA 3. (St\u00e2nga) Bubblers \u00een\u0219urubate \u00een miez. (Dreapta) Bubbler conic pentru a m\u0103ri ie\u0219irea<\/p>\n

NOT\u0102:<\/strong>\u00a0Deoarece at\u00e2t deflectoarele, c\u00e2t \u0219i bublerii au zone de curgere \u00eenguste, rezisten\u021ba la curgere cre\u0219te. Prin urmare, trebuie s\u0103 se acorde aten\u021bie la proiectarea dimensiunii acestor dispozitive. Comportamentul fluxului \u0219i al transferului de c\u0103ldur\u0103 at\u00e2t pentru deflectoare c\u00e2t \u0219i pentru barbotoare poate fi u\u0219or modelat \u0219i analizat prin analiza C-MOLD Cooling.<\/p>\n

Pini termici<\/h1>\n

Un pin termic este o alternativ\u0103 la deflectoare \u0219i bubler. Este un cilindru etan\u0219 umplut cu un fluid. Fluidul se vaporizeaz\u0103 pe m\u0103sur\u0103 ce extrage c\u0103ldura din o\u021belul de scule \u0219i se condenseaz\u0103 pe m\u0103sur\u0103 ce elibereaz\u0103 c\u0103ldura c\u0103tre lichidul de r\u0103cire, dup\u0103 cum se arat\u0103 \u00een figura 4. Eficien\u021ba transferului de c\u0103ldur\u0103 a unui \u0219tift termic este de aproape zece ori mai mare dec\u00e2t a unui tub de cupru. Pentru o bun\u0103 conduc\u021bie a c\u0103ldurii, evita\u021bi un gol de aer \u00eentre \u0219tiftul termic \u0219i matri\u021b\u0103 sau umple\u021bi-l cu un material de etan\u0219are foarte conductiv.<\/p>\n

\"\"<\/p>\n

FIGURA 4. Eficien\u021ba transferului de c\u0103ldur\u0103 al \u0219tiftului termic<\/h3>\n

R\u0103cirea miezurilor sub\u021biri<\/h1>\n

\u00cen cazul \u00een care diametrul sau l\u0103\u021bimea sunt foarte mici (mai pu\u021bin de 3 mm), numai r\u0103cirea cu aer este posibil\u0103. Aerul este suflat \u00een miezuri din exterior \u00een timpul deschiderii matri\u021bei sau curge prin gaura central\u0103 din interior, a\u0219a cum se arat\u0103 \u00een figura 5. Aceast\u0103 procedur\u0103, desigur, nu permite men\u021binerea unei temperaturi exacte a matri\u021bei.<\/p>\n

\"\"<\/p>\n

FIGURA 5. R\u0103cirea cu aer a unui miez sub\u021bire<\/h3>\n

R\u0103cirea mai bun\u0103 a miezurilor sub\u021biri (cele care m\u0103soar\u0103 mai pu\u021bin de 5 mm) se realizeaz\u0103 prin utilizarea unor inser\u021bii realizate din materiale cu conductivitate termic\u0103 ridicat\u0103, cum ar fi materialele din cupru sau beriliu-cupru. Aceast\u0103 tehnic\u0103 este ilustrat\u0103 \u00een figura 6 de mai jos. Astfel de inser\u021bii sunt montate prin presare \u00een miez \u0219i se extind cu baza lor, care are o sec\u021biune transversal\u0103 c\u00e2t mai mare posibil, \u00eentr-un canal de r\u0103cire.<\/p>\n

\"\"<\/p>\n

FIGURA 6. Utilizarea unui material cu conductivitate termic\u0103 ridicat\u0103 pentru a r\u0103ci un miez sub\u021bire<\/h3>\n

R\u0103cirea nucleelor mari<\/h1>\n

Pentru diametrele mari ale miezului (40 mm \u0219i mai mari), trebuie asigurat un transport pozitiv al agentului de r\u0103cire. Acest lucru poate fi realizat cu inser\u021bii \u00een care agentul de r\u0103cire ajunge la v\u00e2rful miezului printr-un orificiu central \u0219i este condus printr-o spiral\u0103 p\u00e2n\u0103 la circumferin\u021ba acestuia, iar \u00eentre miez \u0219i inser\u021bie \u00een mod elicoidal p\u00e2n\u0103 la ie\u0219ire, dup\u0103 cum se arat\u0103 \u00een figura 7. Acest model sl\u0103be\u0219te semnificativ miezul.<\/p>\n

\"\"<\/p>\n

FIGURA 7. Utilizarea unui deflector elicoidal pentru r\u0103cirea miezului mare<\/h3>\n

R\u0103cirea miezurilor cilindrilor<\/h1>\n

R\u0103cirea miezurilor cilindrilor \u0219i a altor piese rotunde ar trebui s\u0103 se fac\u0103 cu o spiral\u0103 dubl\u0103, a\u0219a cum se arat\u0103 mai jos. Lichidul de r\u0103cire curge spre v\u00e2rful miezului \u00eentr-un helix \u0219i se \u00eentoarce \u00een alt helix. Din motive de proiectare, grosimea peretelui miezului trebuie s\u0103 fie de cel pu\u021bin 3 mm \u00een acest caz.<\/p>\n

\"\"FIGURA 8. Spiral\u0103 dubl\u0103 cu bubbler central<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>","protected":false},"excerpt":{"rendered":"

What do they do? Baffles and bubblers are sections of cooling lines that divert the coolant flow into areas that would normally lack cooling. Cooling channels are typically drilled through the mold cavity and core. The mold, however, may consist of areas too far away to accommodate regular cooling channels. Alternate methods for cooling these […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[10],"tags":[],"class_list":["post-519","post","type-post","status-publish","format-standard","hentry","category-news-3"],"yoast_head":"\nAlternative cooling devices - 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\/16\/dispozitive-alternative-de-racire\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Alternative cooling devices - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"What do they do? Baffles and bubblers are sections of cooling lines that divert the coolant flow into areas that would normally lack cooling. Cooling channels are typically drilled through the mold cavity and core. The mold, however, may consist of areas too far away to accommodate regular cooling channels. 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