Shanghai Daoqin Plastics Co., Ltd.

automotive 保险杠 is automotive upper comparison large trim parts 之一, it tool has safety property, function property and decoration property large main/primary function.

automotive 保险杠 light amount main/primary has types 途径: material light amount 化, structure optimization design and manufacturing process innovation. material light amount generally is in conditions lower use density comparison low material substitute/replace 原 材 material, ratio 如以塑代钢; 保险杠 light amount structure optimization design main/primary has thin technology; manufacturing new process has micro foaming material and gas molding and other new technology.

plastics 保险杠材 material material selection

plastics is has quality light, use property can good, manufacturing simple, corrosion resistant, resistant impact, design degree comparison large and other features, by widely used in automotive industrial upper, but also in automotive material in ratio/proportion 越 越 large. automotive upper plastics use amount how much already formed is amount 一 国家 automotive industrial development water 平 一 standards 之一. currently 发达国家 production automotive use plastics already to 200kg, large 约占整车 quality 20% left right.

plastics in automotive industrial in application comparison 晚, in type in plastics use amount has 50~60kg, in high grade has 60~80kg, separation automotive can to 100kg, in production manufacturing in type automotive 时, automotive use 50kg plastics. 每一辆 automotive plastics use amount automotive weight 5%~10%.

保险杠 材 material usually has below/following requirements: good impact resistant can force, good weather resistance. good paint can force, good flow property, good processing properties, price low 廉.

据此, PP type material is property ratio most excellent selection. PP material is types property can comparison excellent general purpose plastics, PP low temperature property can and impact resistant can force comparison 差, wear resistant, easy aging and dimensional stability comparison 差, therefore commonly used modified PP automotive 保险杠 production material. currently polypropylene (PP) automotive 保险杠 specialized material usually PP is material, add 入一定 ratio/proportion or elastomer, machine filler, color masterbatch, additives and other material mixing/compounding processing formed.  

保险杠 thin belt/tape issues and solution measures

保险杠 thin 壁化容 easy warpage deformation, warpage deformation is internal stress 释放 结果. thin 壁化保险杠 in injection molding stage/phase in due to multiple causes generate internal stress.

generally main/primary orientation force, hot force and demolding force. orientation force is melt in fiber, large separation or 链段沿 一定 direction orientation, 松弛不足而引起 inner force. orientation degree and product thick degree, melt temperature degree, mold temperature degree, injection pressure, holding pressure time has 关. thick degree large, orientation degree low; melt temperature degree high, orientation degree low; mold temperature degree high, orientation degree low; injection pressure high, orientation degree high; holding pressure time long, orientation degree large.

hot force is is due to melt temperature degree relatively high mold temperature degree relatively low formed relatively large temperature 差, in mold 腔体区域 melt cooling speed degree relatively fast generate distribution non-uniform machine internal stress.

demolding force main/primary due to mold strong/high degree and rigid degree 不足, in injection pressure and ejection force function lower generate elastic property deformation and ejection distribution 排列不 combined make product ejection force non-uniform generate.

保险杠 thin also has demolding difficult issues, due to thick table/sheet relatively small has relatively small shrinkage amount, make product viscous in mold upper; due to injection speed degree comparison high, make holding pressure time control comparison difficult; comparison thin thick and add strong/high in demolding 时也容 easy loss bad. mold positive 常打开 need injection machine can provide mold opening force, mold opening force can 够克服 mold opening retardant force.

mold opening process in need retardant force has below/following types:

首先 is need 克服直接 mold opening force, mold opening plastics in 平行于 mold opening direction has viscous force generate, this is due to mold cooling 时, plastics parts cooling 不足, type elastic property 膨胀没 has full 恢复. this type of viscous force large small and plastics property 质, mold surface quality, demolding degree and other has 关.

in addition also need 克服间接 mold opening retardant force, 即克服 mold opening machine 动侧抽芯 process retardant force.

also need mold sheet/plate and active sheet/plate and other machine 构运动 generate scratch retardant force.

most rear also need type 腔 参 and pressure, mold opening type pressure can can and other large gas pressure, type inner pressure and outer pressure versus and other.

is solution above large issues, need 适当改进 mold design. selection combined mold material, improve/increase mold hot strong/high property and wear resistance. combined mold structure design and manufacturing, increase sheet/plate and in sheet/plate thick degree, improve/increase mold rigid degree, decrease small mold elastic property deformation.

improve/increase machine 构, system manufacturing and combined degree, reduce type 腔, and 凸模组 parts surface coarse degree, decrease small demolding force. due to products thin 壁化以 rear requirements more high design and combined degree, usually 设置连锁 plant/unit anti 止模芯 and mold cavity versus for 位移.

combined design system, runner design make plastics parts in injection process in from relatively thick toward relatively thin degree. also need has more gas 口. in injection process 方面应该尽 amount decrease small plastics parts internal stress, improve/increase injection speed degree, reduce cooling speed degree. therefore need improve/increase melt temperature degree and mold temperature degree, orientation 松弛. also need selection combined injection pressure, holding pressure time and cooling speed degree.