Shanghai Daoqin Plastics Co., Ltd.

injection molding processing 时 injection molding machine temperature rise high large 危害: make machine generate hot deformation; viscosity reduce; seals deformation; accelerated liquid oxidation 变质; meanwhile make gas separation force pressure reduce.

    一: make machine generate hot deformation: liquid pressure parts in hot 胀系数 different 运动部 parts its combined 见习变 small 而卡死, 引起动 as 失灵, effect/influence liquid pressure system 传动精 degree, 导致部 parts as quality 变差.

    二: make viscosity reduce: injection molding machine temperature rise high will 导致油 viscosity reduce, increase, 泵 容积 efficiency and system efficiency significantly reduce. due to viscosity reduce, slip and other 移动部 parts film thin and by 切破, scratch retardant force increase large, abrasion loss add 剧.

    三: make seals deformation: injection molding machine temperature rise high make seals deformation, accelerated aging 失效, reduce property can and use lifespan, formed 泄漏.

    四: accelerated liquid oxidation 变质: injection molding machine temperature rise high accelerated liquid oxidation 变质, 析出沥青 material 质, reduce liquid pressure use lifespan. material retardant small and 缝隙式阀口, pressure 阀卡死而不 can as, metal tube/pipe long bending, 甚至破裂 and other.

    五: 导致部 parts as quality 变差: injection molding machine temperature rise high 会导致部 parts as quality 变差, in solvent understanding gas 逸出, generate gas 穴, make liquid pressure system as property can reduce.

injection molding machine as principle and process:

    1, injection molding machine as principle: and use injection device versus 似, it is screw （ or 柱塞） 推 force, will already good melt 状态（即 viscous 流态） plastics injection combined good mold cavity inner, solid type rear products process process.

    2, injection molding is 一 循 ring process, cycle main/primary 包括: amount add material —熔 melt 塑化—施 pressure injection —充模 cooling —启模取 parts. 取出塑 parts rear also again 闭模, lower 一 循 ring.

    3, injection molding machine as project: injection molding machine as project control 键盘操 as, electrical appliances control system as and liquid pressure system as 三 方面. separation 别进行 injection process as, add material as, injection pressure, injection speed degree, ejection type selection, material 筒各段 temperature degree 监控, injection pressure and back pressure pressure adjustment and other.

    4, generally screw injection molding machine molding process process is: will or powder plastics add machine inner, through screw and machine outer add hot make plastics formed is melt 状态, rear machine clamping and injection base/seat front 移, make nozzle mold gate 道, toward injection 缸通人 pressure 油, make screw toward front 推进, from very high pressure and relatively fast speed degree will material temperature degree relatively low combined mold inner, 经 一定 time and pressure maintain （ also holding pressure ）, cooling, make its solid molding, can mold opening products （ holding pressure is anti mold cavity in material 反流, toward mold cavity inner material material, and ensure products tool has density and dimensions 公差）. injection molding basic requirements is 塑化, injection and molding. is achieve and ensure molding products quality front 提, is meet/satisfy molding requirements, injection must ensure has pressure and speed degree. meanwhile, due to injection pressure very high, versus in mold cavity in generate very high pressure （ mold cavity inner pressure generally in 20~45MPa between ）, therefore must has large clamping force. can 见, injection plant/unit and clamping plant/unit is injection molding machine key/critical parts.

    5, for plastics products evaluation main/primary has 三 方面, is appearance quality, 包括完整 property, color, gloss and other; is dimensions and versus for 位置间 准确 property; is and applications versus physical properties, chemical property can, electrical property can and other. this quality requirements also according to products use combined different, requirements degree different. products defect main/primary in mold design, manufacturing degree and abrasion loss degree and other 方面. 但事实 upper, plastics processing technology 人员往往苦于面 for use process 手段 弥补 mold defect belt/tape issues formed large difficult 局面.

    6, production process in process adjustment is improve/increase products quality and output/production volume necessary 途径. due to injection molding cycle very short, if process conditions 掌握不 good, waste product 就会源源不绝. in adjustment process most good one-time 改变一 conditions, more 观察几回, if pressure, temperature degree, time 统统一起调 话, very easy formed mixed and understanding, issues 也不知道 is 何道理. adjustment process measures, is more 方面. 例如: solution products 注不满 issues has more can can solution 途径, need selection solution issues 症结 一, main/primary solution/scheme, can true positive solution issues. in addition, also attention/notes solutions in 辨证关系. ratio 如: products 出现 凹陷, has need improve/increase material temperature, has need reduce material temperature; has need increase material amount, has need decrease/reduce material amount. need 承认逆 toward measures solution issues can property.