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    S136模具尺寸和制造公差的確定

      
    發布時間:2023年02月17日 來源:S136模具鋼 作者:蘇州S136 點擊:
      

      S136模具尺寸和制造公差的確定

      S136模具型(xing)腔和型(xing)芯的(de)加(jia)工尺寸除(chu)了通過(guo)D=M(1+S)公式計算(suan)基本尺寸之(zhi)外,還有一個加(jia)工公差的(de)問題。

      按(an)照慣例(li),模(mo)具(ju)的(de)加工公(gong)差(cha)為塑件公(gong)差(cha)的(de)1/3。但由于塑料收縮率范(fan)圍和(he)穩定性(xing)各有差(cha)異.

      首(shou)先必(bi)須合理化(hua)確(que)定(ding)不同塑(su)料(liao)所成形塑(su)件(jian)(jian)的(de)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)。即由收(shou)縮率范圍較(jiao)大(da)或(huo)收(shou)縮率穩定(ding)較(jiao)差(cha)(cha)(cha)塑(su)料(liao)成形塑(su)件(jian)(jian)的(de)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)應(ying)取得大(da)一些。否則就可(ke)能出現大(da)量(liang)尺(chi)(chi)寸(cun)超(chao)差(cha)(cha)(cha)的(de)廢品(pin)。為此,各國對塑(su)料(liao)件(jian)(jian)的(de)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)專(zhuan)門(men)制(zhi)訂(ding)了(le)標(biao)(biao)(biao)準(zhun)(zhun)或(huo)行業標(biao)(biao)(biao)準(zhun)(zhun)。中(zhong)國也曾制(zhi)訂(ding)了(le)部級專(zhuan)業標(biao)(biao)(biao)準(zhun)(zhun)。但大(da)都無相應(ying)的(de)模(mo)具(ju)(ju)型腔(qiang)的(de)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)。德國標(biao)(biao)(biao)準(zhun)(zhun)中(zhong)專(zhuan)門(men)制(zhi)訂(ding)了(le)塑(su)件(jian)(jian)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)的(de)DIN16901標(biao)(biao)(biao)準(zhun)(zhun)及相應(ying)的(de)模(mo)具(ju)(ju)型腔(qiang)尺(chi)(chi)寸(cun)公(gong)差(cha)(cha)(cha)的(de)DIN16749標(biao)(biao)(biao)準(zhun)(zhun)。此標(biao)(biao)(biao)準(zhun)(zhun)在世界上具(ju)(ju)有較(jiao)大(da)的(de)影響(xiang),因而可(ke)供塑(su)料(liao)模(mo)具(ju)(ju)行業參考。

      關于(yu)S136塑件的尺寸(cun)公差和允(yun)許偏(pian)差為(wei)了(le)合理地確(que)定不同收縮特性(xing)材料所成形塑件的尺寸(cun)公差,讓標(biao)準引入了(le)成形收縮差△VS這一概念。

      △VS=VSR_VST(4)式中:VS-成(cheng)形收縮(suo)差(cha)(cha)(cha)(cha) VSR-熔(rong)(rong)料(liao)(liao)流(liu)(liu)動方向的(de)(de)成(cheng)形收縮(suo)率 VST-與熔(rong)(rong)料(liao)(liao)流(liu)(liu)動垂直方向的(de)(de)成(cheng)形收縮(suo)率。根據塑(su)料(liao)(liao)△VS值,將各種(zhong)塑(su)料(liao)(liao)的(de)(de)收縮(suo)特性分為(wei)4個組(zu)(zu)。△VS值小(xiao)的(de)(de)組(zu)(zu)是高精度組(zu)(zu),以此類推,△VS值大(da)的(de)(de)組(zu)(zu)為(wei)低精度組(zu)(zu)。并按照(zhao)基本(ben)尺(chi)(chi)寸(cun)(cun)編制了精密技(ji)術、110、120、130、140、150和(he)(he)160公(gong)(gong)差(cha)(cha)(cha)(cha)組(zu)(zu)。并規定(ding),用(yong)(yong)(yong)(yong)收縮(suo)特性穩定(ding)的(de)(de)塑(su)料(liao)(liao)成(cheng)形塑(su)件(jian)(jian)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)可選(xuan)(xuan)用(yong)(yong)(yong)(yong)110、120和(he)(he)130組(zu)(zu)。用(yong)(yong)(yong)(yong)收縮(suo)特性中等穩定(ding)的(de)(de)塑(su)料(liao)(liao)成(cheng)形塑(su)件(jian)(jian)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)選(xuan)(xuan)用(yong)(yong)(yong)(yong)120、130和(he)(he)140。如果(guo)用(yong)(yong)(yong)(yong)這類塑(su)料(liao)(liao)成(cheng)形塑(su)件(jian)(jian)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)選(xuan)(xuan)用(yong)(yong)(yong)(yong)110組(zu)(zu)時,即(ji)可能出大(da)量尺(chi)(chi)寸(cun)(cun)超差(cha)(cha)(cha)(cha)塑(su)件(jian)(jian)。用(yong)(yong)(yong)(yong)收縮(suo)特性較差(cha)(cha)(cha)(cha)的(de)(de)塑(su)料(liao)(liao)成(cheng)形塑(su)件(jian)(jian)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)選(xuan)(xuan)用(yong)(yong)(yong)(yong)130、140和(he)(he)150組(zu)(zu)。用(yong)(yong)(yong)(yong)收縮(suo)特性差(cha)(cha)(cha)(cha)的(de)(de)塑(su)料(liao)(liao)成(cheng)形塑(su)件(jian)(jian)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)選(xuan)(xuan)用(yong)(yong)(yong)(yong)140、150和(he)(he)160組(zu)(zu)。在使用(yong)(yong)(yong)(yong)此公(gong)(gong)差(cha)(cha)(cha)(cha)表時,還需注(zhu)(zhu)意(yi)以下各點。表中的(de)(de)一般公(gong)(gong)差(cha)(cha)(cha)(cha)用(yong)(yong)(yong)(yong)于不(bu)注(zhu)(zhu)明公(gong)(gong)差(cha)(cha)(cha)(cha)的(de)(de)尺(chi)(chi)寸(cun)(cun)公(gong)(gong)差(cha)(cha)(cha)(cha)。直接(jie)標注(zhu)(zhu)偏(pian)差(cha)(cha)(cha)(cha)的(de)(de)公(gong)(gong)差(cha)(cha)(cha)(cha)是用(yong)(yong)(yong)(yong)于對塑(su)件(jian)(jian)尺(chi)(chi)寸(cun)(cun)標注(zhu)(zhu)公(gong)(gong)差(cha)(cha)(cha)(cha)的(de)(de)公(gong)(gong)差(cha)(cha)(cha)(cha)帶。

      其(qi)(qi)上(shang)、下(xia)偏差(cha)(cha)(cha)(cha)可(ke)(ke)設計人員自行確定(ding)。例如公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)帶(dai)為(wei)(wei)(wei)0.8mm,則可(ke)(ke)以(yi)選用(yong)(yong)以(yi)下(xia)各種(zhong)(zhong)上(shang)、下(xia)偏差(cha)(cha)(cha)(cha)構成(cheng)。0.0;-0.8;±0.4;-0.2;-0.5等。每一(yi)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)組中(zhong)均有A、B兩組公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)值。其(qi)(qi)中(zhong)A是由模(mo)(mo)具(ju)(ju)零件(jian)(jian)組合(he)形成(cheng)的(de)(de)(de)尺寸(cun)(cun),增加了(le)S136模(mo)(mo)具(ju)(ju)零件(jian)(jian)對合(he)處不密合(he)所(suo)形成(cheng)的(de)(de)(de)錯差(cha)(cha)(cha)(cha)。此增加值為(wei)(wei)(wei)0.2mm。其(qi)(qi)中(zhong)B是直接由模(mo)(mo)具(ju)(ju)零件(jian)(jian)所(suo)決定(ding)的(de)(de)(de)尺寸(cun)(cun)。精(jing)密技術是專門設立的(de)(de)(de)一(yi)組公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)值,供具(ju)(ju)有高精(jing)度要求塑(su)件(jian)(jian)使用(yong)(yong)。在此用(yong)(yong)塑(su)件(jian)(jian)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)之前,首先必須知道(dao)所(suo)使用(yong)(yong)的(de)(de)(de)塑(su)料(liao)(liao)適用(yong)(yong)哪幾個公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)組。模(mo)(mo)具(ju)(ju)的(de)(de)(de)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)德國標(biao)準針(zhen)對塑(su)件(jian)(jian)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)制(zhi)(zhi)(zhi)訂了(le)相應模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)的(de)(de)(de)標(biao)準DIN16749。該表中(zhong)共(gong)設4種(zhong)(zhong)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)。不論何種(zhong)(zhong)材(cai)料(liao)(liao)的(de)(de)(de)塑(su)件(jian)(jian),其(qi)(qi)中(zhong)不注明(ming)尺寸(cun)(cun)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)尺寸(cun)(cun)的(de)(de)(de)模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)均使用(yong)(yong)序號1的(de)(de)(de)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)。具(ju)(ju)體(ti)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)值由基本尺寸(cun)(cun)范圍確定(ding)。不論何種(zhong)(zhong)材(cai)料(liao)(liao)塑(su)件(jian)(jian)中(zhong)等精(jing)度尺寸(cun)(cun)的(de)(de)(de)模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)為(wei)(wei)(wei)序號2的(de)(de)(de)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)。不論何種(zhong)(zhong)材(cai)料(liao)(liao)塑(su)件(jian)(jian)較高精(jing)度尺寸(cun)(cun)的(de)(de)(de)模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)為(wei)(wei)(wei)序號3的(de)(de)(de)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)。精(jing)密技術相應的(de)(de)(de)模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)為(wei)(wei)(wei)序號4的(de)(de)(de)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)。可(ke)(ke)以(yi)合(he)理(li)地(di)確定(ding)各種(zhong)(zhong)材(cai)料(liao)(liao)塑(su)件(jian)(jian)的(de)(de)(de)合(he)理(li)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha)和相應的(de)(de)(de)模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)公(gong)(gong)(gong)差(cha)(cha)(cha)(cha),這不僅給模(mo)(mo)具(ju)(ju)制(zhi)(zhi)(zhi)造(zao)帶(dai)來方便(bian),還(huan)可(ke)(ke)以(yi)減少(shao)廢(fei)品(pin),提高經(jing)濟(ji)效期益。

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