Shanghai Daoqin Plastics Co., Ltd.

in recent years, 随 人们生 active water improve/increase, automotive 进入家庭, plastics demand amount increase, VCD and, DVD 临, transparent plastics demand 越 越 large, PMMA as is types transparent plastics, light transmittance high, used for high precision 望远镜镜 sheet/slice, 目镜, material 镜, 但 injection molding parts process difficult breakthrough, technology also by Japan 垄断, inner enterprise and 科研 虽 has research can is also is breakthrough 不, this is 国人 痛, large 家各抒 already 见, table/sheet 自己 一 见 understanding, especially is precision injection molding parts process. PMMA injection shot molding is non 常麻烦, has very more is experience, has very more mold in this type of mold 时都认 is very simple, block thin sheet/slice, mold 做完 才发现不 is that simple, manufacturing more 款SONYDVD镜 sheet/slice, large automotive 音响面 sheet/plate, and other, optical sheet/slice 本人修 this category of mold, mold its difficult, key/critical is need use CNC optical abrasion machine light, need manufacturing good this category of mold, from design to production need attention/notes: according to product large small and thick degree, and plastics machine amount, 确定模穴数, generally 开一模两穴, or 四穴, more has what benefits, can more 一点. design 时先做模流 analysis, this very important, especially is long 方形镜 sheet/slice, 进胶点 in long 边靠角落处15MM处才 is most good, if product positive good has 一碰穿孔, or is decrease 胶位就 more good, production very easy gas marks and 熔胶痕. gas design, generally transparent sheet/slice is has 顶针痕, need 开辅助 runner ejection, this runner 就起排 gas function, generally 坚持一 原则, has degree need has gas. runner and 进胶口 design, runner 开梯形, 进胶口开扇形, runner need light non light 亮. selection, generally output/production volume in 10万以 inner, can use Japan positive NAK80就 can, if output/production volume very large, must selection S136 or method Domestic SMV3W high hot 处理钢材, hot to HRC52, again processing rear light, non good, 本身PMMA就 has 一定 腐蚀 property, use hot 处理钢材完 full can remove mold production time rear surface has phenomenon, 当然钢材一定 need in procurement, in very more Domestic or full is S136, full to this type of 效果, if 图便宜, this type of material, what good, is surface 抛不亮, how is dark 钢材纹理, rear 悔都 不 and, S136直接 in 一胜百 or company 购买, negative hot 处理, SMV3W has 龙记代理, use 效果同S136差不 more. mold in injection shot need add temperature, temperature in 120 degree left right, mold manufacturing need mold specialized temperature degree table/sheet in mold upper. plastics machine need selection A type small screw, or ratio A type screw also small PC,PMMA specialized screw, speed very high, this is molding quality good bad basic ensure, has types is full electrical machine precision injection shot machine, molding very good, in has plastics machine production has development this type of specialized machine 台. has very thin transparent parts, can use add nitrogen high pressure injection shot, this is specialized machine 台, in also has use pressure methods molding, 先射胶 again high pressure clamping molding