Shanghai Daoqin Plastics Co., Ltd.

injection molding industrial in currently 巿场越发 more large front lower, in development wide, ratio more color injection molding, gas 体辅助, inner film, injection molding and other new process. in injection molding machine specifications upper, in toward direction development —— large injection molding machine and micro type injection molding machine in more new 换代.

in recent years, micro type products demand 越 越 more, is electronics industry, table/sheet also is military industry industry in, has a large amount of micro small injection molding parts demand, this injection molding products in dimensions and degree upper requirements non high.

    in this front lower, micro type injection molding process 也就面临 巨 large 挑战, how to can let injection molding parts meet/satisfy micron grade dimensions requirements, meanwhile also need tool good appearance and property can 呢? below/following 我们针 for micro type injection molding in mold, equipment, material, process and other and injection molding 差别做一 simple introduction.

    mold processing and key points

    in mold 方面, micro type injection molding for/regarding processing equipment requirements versus for injection molding need high very more.

    micro type injection molding in mold processing usually has types trend: types is using/adopting 镜面火花 machine processing, is ensure high density, most good need use electrical 极进行 electrical processing, is electrical loss consumption ratio copper electrical need small very more.

    types comparison commonly used processing methods is using/adopting electrical 铸模, using/adopting electrical process can ensure non high degree, disadvantages is processing cycle long, 每一穴都 need processing, also has in production in if has light micro loss method 修复, can heavy new more loss bad 穴位.

    in mold 方面, mold temperature is micro type injection molding very important parameters. for high demand 客户, currently comparison commonly used method is use high light injection molding field/area 理念, fast speed add hot and cooling system.

    upper, high mold temperature for/regarding micro type injection molding very has 帮助, ratio can anti thin filling difficult, material, is high mold temperature degree also belt/tape new issues, ratio cycle add long and mold opening rear shrinkage deformation and other. therefore new mold temperature system versus important, in injection molding process in mold temperature degree can improve/increase （ can ultra- use plastics melting point ）, make melt can fast speed type 腔, anti melt in process in temperature degree reduce fast formed 充填不 full; demolding 时, mold temperature degree also can speed reduce, maintain in ratio plastics heat deflection temperature (HDT) low temperature degree inner, rear again mold opening ejection.

    remove outer, due to micro type injection molding is quality is milli grade products, if using/adopting 普通浇注 system injection molding products, make is in as most optimization rear, products and system inner material material quality ratio still is 1:10. has to 10% material material by injection molding formed micro type products, generate a large amount of system material, therefore micro type injection molding using/adopting hot runner system.

in material selection 方面, in development front can selection viscosity low, heat stabilized property good general purpose engineering plastics.

    selection low viscosity material is is in process in melt viscosity low, 整 浇注 system retardant force versus for small, filling speed degree relatively fast, can ensure melt 顺利充满 type 腔, melt temperature degree 也不会 has obvious reduce, in products upper easy formed cold 接缝, but also in process in separation orientation less, products property can comparison uniform.

    if selection high viscosity plastics, not only filling relatively slow, but also material time relatively long, due to material 引起 剪切 flow easy make separation 子沿剪切 flow direction orientation, in this 样情况 lower cooling to soft below/following orientation by 冻结, this type of in 一定程 degree upper orientation easy formed products internal stress, 甚至引起 products force cracking or warpage deformation.

    requirements plastics heat stabilized property good 理由则 is due to material material long time in hot runner inner or screw function easy formed thermal degradation, especially is for hot property plastics, make in very short ring time inner, 也会因 is material material injection amount small, in system inner time versus for relatively long, formed plastics versus degree degradation, therefore hot property plastics combined micro type injection molding.

    equipment selection key points

    in equipment selection 方面, due to micro type injection molding parts dimensions large small is micron grade products, selection injection amount is milli grade injection machine.

    this category of injection machine injection mono generally using/adopting screw -柱塞组 combined 式, screw separation formed for material material 塑化, 并由柱塞 will melt to type 腔. screw 柱塞式 injection molding machine can combined screw high degree and equipment high speed degree, can ensure production process degree and filling speed degree.

    in addition, this type of injection machine usually clamping toward machine 构, injection system, gas demolding machine 构, quality testing machine and packaging system formed. good quality testing system can ensure micro type precision injection molding products formed product rate, 监控整 process in parameters 波动情况.

    injection molding process key points

    most rear, 我们看 lower micro type injection molding in injection molding process requirements. in injection molding process upper, need gate gas and force issues, usually need using/adopting more grade injection molding, ensure material can 够处于稳流 状态 filling.

    remove outer, also need holding pressure time large small, small holding pressure pressure 会导致 product shrinkage, is large holding pressure also 会导致应 force in, and dimensions large and other issues.

    another, material in material tube/pipe in time is need 严格监控, material in material tube/pipe in time long, 会导致材 material degradation effect/influence product function. in process parameters tube/pipe upper need standards parameters tube/pipe 控, product in amount front most good can 够做DOE验证, production in has 改动都 need heavy new dimensions and function testing.

    micro type injection molding as is injection molding field/area in separation 支, positive high dimensions degree, high function demand, high appearance requirements direction development, has through mold, equipment, material, process and other process/workflow control and technology improve/increase can meet/satisfy development.