Shanghai Daoqin Plastics Co., Ltd.

precision injection molding parts molding concept precision injection molding parts is processing molding injection molding parts products dimensions heavy degree very high, use general purpose injection molding parts machine, injection molding parts molding process difficult to requirements types injection molding parts molding methods. “ precision injection molding parts molding ” this concept, main/primary is difference 于“常规 injection molding parts molding ”, it is polymer/macromolecule material speed development, in table/sheet, electronics field/area using/adopting precision plastics parts high degree metal parts technology. currently for precision injection molding product indicators has 2, is products dimensions heavy degree, is products quality heavy degree. main/primary from products dimensions heavy degree 方面阐述 precision injection molding parts molding. due to various material property and processing process different, can plastics made parts degree and metal parts degree and other 同起. precision injection molding parts molding is 一门涉 and Raw Materials property can, formulation, molding process and equipment and other more comprehensive technology, precision plastics products 包括DVD数码 light 盘, DVD激 light 头, versus machine parts, electrical 脑接插 parts, light guide sheet/plate, non 球面透镜 and other precision product, this category of product significantly features is dimensions degree requirements high, but also for products inner in quality and formed product rate requirements high. molding products injection molding parts mold is 决定该 products can to design requirements dimensions important conditions, precision injection molding parts machine is ensure products in requirements dimensions scope/range inner molding, and ensure high formed product rate key/critical equipment. plastics products most high degree and other grade is grade. 1.1 precision injection features (1) made parts dimensions degree high, small, has high degree dimensions 界限; (2) products weight heavy degree high, requirements has day, month, year dimensional stability; (3) injection molding parts mold material good, rigid property 足, type dimensions degree, light degree and sheet/plate 间 定位精 degree high; (4) using/adopting precision injection machine more 换常规 injection machine; (5) using/adopting precision injection molding parts molding process; (6) selection precision injection molding parts molding material. products most important technology indicators, is injection molding parts products degree (dimensions 公差, 形位公差 and products surface light degree). use standards is SJ1372―78, and Japan plastics products degree and injection molding parts mold degree and other grade very 接近. injection molding parts precision plastics products, from material selection, injection molding parts mold design, injection molding parts molding process, as technology water and other 4 large factors 进行严格 control. precision injection molding parts machine requirements products dimensions degree generally in 0.01～0.001mm以 inner, many precision injection molding parts also requirements injection molding parts machine tool has high injection pressure, high injection speed degree; requirements clamping system tool has large rigid property and high 锁模精 degree, 谓锁模精 degree is clamping force uniform property, can 调, stability and heavy property high, clamping 位置精 degree high; requirements for pressure, amount, temperature degree, amount and other can control to versus 应 精 degree, using/adopting more grade or grade injection, ensure molding process again conditions and products dimensions heavy degree and other. 1.2 effect/influence products dimensions degree factors (1) injection molding parts mold degree; (2) molding shrinkage; (3) products use ring temperature degree, wet degree and 波动 幅 degree. 2 injection molding parts precision molding material selection machine strong/high degree high, dimensional stability good, resistant creep property can good, ring 境适应 scope/range 广. commonly used has types material: (1)POM and carbon fiber reinforced (CF) or reinforcement (GF); this type of material features is creep resistance can good, resistant fatigue, weather resistance, electrical property can good, flame resistant, add lubricant easy demolding. (2)PA and glass fiber reinforced PA66, its features: impact resistant can force and wear resistance can strong/high, flow property can good, can molding 0.4mm壁 thick products. glass fiber reinforced PA66 tool has heat resistant property (melting point 250℃), its disadvantages is tool has wet property, generally molding rear need through wet 处理. (3)PBT reinforcement polyester, molding time short. molding time comparison lower: PBT≤POM≈PA66≤PA6. (4)PC and GFPC features: good wear resistance, reinforcement rear rigid property improve/increase, dimensional stability good, weather resistance, flame resistant and molding processing property good. 3 precision injection molding parts molding in shrinkage issues effect/influence shrinkage factors has types: hot shrinkage, versus shrinkage, orientation shrinkage and pressure shrink shrinkage. 3.1 hot shrinkage is molding material and injection molding parts mold material solid has hot material features. injection molding parts mold temperature degree high, products temperature degree high, shrinkage rate increase, therefore precision injection injection molding parts mold temperature degree high. 3.2 versus shrinkage due to crystallization type resin in toward process in, polymer/macromolecule crystallization 化, due to ratio decrease/reduce 而引起 shrinkage, versus shrinkage. injection molding parts mold temperature degree high, crystallization degree high, shrinkage rate large; 但另一方面, crystallization degree improve/increase make products density increase, 线膨胀系数 decrease small, shrinkage rate reduce. therefore shrinkage rate 由两者 comprehensive function 而定. 3.3 orientation shrinkage, due to separation in flow direction upper strong/high tensile, make in cooling large separation has heavy new 卷曲恢复 trend, in orientation direction will generate shrinkage. separation orientation degree and injection pressure, injection speed degree, resin temperature degree and injection molding parts mold temperature degree and other has 关. main/primary is injection speed degree. 3.4 pressure shrink shrinkage and elastic property 复位, generally plastics tool has pressure shrink property. in high pressure lower ratio 容发生 significantly 变化. in generally temperature degree lower, improve/increase pressure molding products ratio decrease small, density increase, 膨胀系数 decrease small, shrinkage rate significantly decline. for pressure shrink property, molding material tool has elastic property function, make products shrinkage decrease small. effect/influence products molding shrinkage factors and molding conditions and as conditions has 关. 4 precision injection molding parts injection molding parts mold 4.1 injection molding parts mold degree, main/primary 取决于 injection molding parts mold type dimensions degree high, type 腔定位准确 or separation type degree is meet/satisfy requirements. generally precision injection molding parts injection molding parts mold dimensions 公差, control in products dimensions 公差 1/3 below/following. 4.2 can processing property and rigid property, in injection molding parts mold structure design in, type 腔数不宜 more, sheet/plate, sheet/plate, type 腔壁都 need thick 一, 以避免 parts in high temperature, high pressure function lower 发生剧烈 elastic property 形变. 4.3 products demolding property, injection molding parts mold need amount less type 腔数, less short runner and ratio injection molding parts mold has more high light degree, this has demolding. 4.4 precision injection molding parts mold material, selection machine strong/high degree high alloy 钢. made as type 腔, 浇道 材 material need 经 严格 hot 处理, selection hardness high (molding parts need to HRC52 left right), wear resistance good, resistant property strong/high material. 5 precision injection machine features and selection 5.1 technology parameters features from injection pressure 方面划 separation, machine: 147 ～177MPa; precision machine: 216 ～243MPa; ultra-high pressure machine: 243～392 MPa. precision injection molding parts machine must high pressure is: (1) improve/increase precision products degree and quality, injection pressure for products molding shrinkage has most obvious effect/influence. injection pressure to 392MPa时, products molding shrinkage is 零. this products degree injection molding parts mold control or ring effect/influence. 实验证明: injection pressure from 98MPa improve/increase to 392MPa rear, machine strong/high degree improve/increase 3%～33%. (2) can decrease small precision products thick, improve/increase molding long degree. 以PC is 例, machine injection pressure 177MPa, can molding 0.2～0.8mm壁 thick products, precision machine injection pressure in 392MPa时 can molding thick degree in 0.15～0.6mm between products. ultra-high pressure injection machine can obtain long ratio more large products. (3) improve/increase injection pressure can separation injection speed rate 功效. to injection speed rate, has 两 办 method: is improve/increase system most high injection pressure; is renovation screw parameters, improve/increase long ratio. precision injection machine injection speed rate requirements high. Germany manufacturing DEMAG precision injection molding parts machine (60～420吨) is 例, it injection speed degree can to 1000mm/s, screw can obtain 12m/s2 accelerated degree. 5.2 precision injection machine in control features (1) for injection molding parts molding parameters heavy degree (again property) requirements high, using/adopting more grade injection control: a. more grade control; b. more grade speed degree control; c. more grade holding pressure control; d. more grade back pressure control; e. more grade screw speed control. 位移传感 device degree requirements to 0.1mm, this can control amount 行程, injection 行程以 and material thick degree (injection shot 监控点), ensure injection amount 准确, improve/increase products molding degree. material and nozzle temperature degree control need 精确, rise temperature ultra- 调 amount need small, temperature degree need small. precision injection molding parts using/adopting PID control, make temperature degree degree in ±0.5℃ between is 宜. (2) quality requirements, plastics uniform property not only effect/influence to injection molding parts parts molding quality, also effect/influence to melt plastics through gate 时 受 retardant force large small, is to uniform 塑化, design specialized screw and use specialized increase technology can less. another, machine temperature degree 也应精确 control, in screw, machine temperature degree more using/adopting PID control (ratio/proportion, micro separation, separation), degree can control in ±l℃ inner, basic can meet/satisfy precision injection molding parts requirements, if using/adopting FUZZY control methods, more combined precision injection molding parts. (3) as temperature degree control need high temperature 变化导致 injection pressure 波动, must for as using/adopting add hot, cooling ring plant/unit, temperature stability in 50～55℃ is 宜. (4) holding pressure pressure effect/influence, holding pressure for degree parts effect/influence large, 准确 说, holding pressure can relatively good shrink, decrease small parts deformation, control parts degree, holding pressure pressure stability 决定 塑 parts molding degree, screw 终止位置不变 is holding pressure 效果 决定 factors. (5) for injection molding parts mold temperature degree control requirements cooling time same, injection molding parts mold type temperature degree low products thick degree need ratio temperature degree high products thick degree dimensions large. 如POM, PA type material, mold temperature 50℃时 thick degree is 50～100μm products, in 80℃时 thick degree decrease small to 20～40μm, 100℃时 decrease small to has 10μm. room temperature for precision products dimensions has effect/influence. 5.3 precision injection molding parts machine liquid pressure system (1) system need using/adopting ratio/proportion pressure 阀, ratio/proportion amount or 伺服变 amount ratio/proportion system. (2) in pressure clamping machine in, clamping separation and injection separation separation 开. (3) due to precision injection molding parts machine tool has high speed property, is must strong/high liquid pressure system reaction speed degree. (4) precision injection molding parts machine liquid pressure system, more need separation machine ― electrical ― liquid ― 仪一体 chemical industry 程. 5.4 precision injection molding parts machine structure features (1) due to precision injection machine injection pressure high, this need strong/high clamping system rigid degree. 动, sheet/plate degree control in 0.05～0.08mm scope/range inner. (2) requirements for low pressure injection molding parts mold and clamping force large small degree control. is clamping force large small need effect/influence injection molding parts mold deformation degree, most need effect/influence to made parts dimensions 公差. (3) 启, speed degree need fast, generally in 60mm/s left right. (4) 塑化部 parts: screw, screw 头, ring, material and other, need design formed can force strong/high, 均化程 degree good, injection efficiency high structure 形式; screw 驱动扭矩 need large, can grade speed. 结论: 无论何 types precision injection molding parts machine, most 终都必 must can stability control products dimensions heavy degree and quality heavy degree. 6 precision injection machine main/primary table/sheet Model/Grade precision injection molding parts molding machine made 方面代 table/sheet world water production injection molding parts processing main/primary has Germany 克劳斯玛菲, 德玛格, 雅宝, 阿博格以 and Japan day 精, day 钢, machine and Sumitomo heavy machine and other injection molding parts processing 厂. Germany 阿博格 company launch precision injection machine clamping machine 构采取 箱式 design, improve/increase 锁模精 degree. due to sheet/plate injection machine front sheet/plate and rear sheet/plate solid machine upper, clamping force add 时, 四拉杆 伸 long to machine 架 约束, from make 拉杆趋 toward “拱桥形”而 effect/influence 锁模精 degree, 箱式样 design from made defect deformation degree improve/increase 锁模精 degree. injection using/adopting di toward pressure control, 精确定位 screw 位置, make injection amount control degree improve/increase 一倍; using/adopting frequency device optimization control 主泵马达, not only make liquid pressure system control degree improve/increase, but also energy saving significantly; in addition, using/adopting block design, injection molding parts molding machine 各运动 system can according to use 户实际 need, liquid pressure and electrical 动两者 组 combined, system and injection system versus for 位置也 can has multiple 配置. day company using/adopting new control system TACT, improve/increase speed degree, as stability property, liquid 晶屏显示 more control interface; new injection machine 构: screw long ratio add large reinforcement 塑化效果, temperature optimization temperature degree control, for pressure 回路进行 optimization; pressure loss reduce, efficiency improve/increase, low speed 运动平稳 property improve/increase, development new pressure 式FN series precision injection molding parts molding machine, also development formed 功 油 pressure small type precision injection molding parts molding machine NP7RealMini, AU3E, AS15 and other machine type. precision injection molding parts molding machine main/primary processing material is liquid crystal polymer (LCP) (LCP), polyamide (PA) (PA), polyphenylene sulfide (PPS) (PPS) and other engineering plastics. day 精NEX150 precision injection machine comprehensive Ultimate micro type injection molding parts technology, can used for large amount injection molding parts molding processing micro small precision plastics parts, has optimization design 精确计 amount and fast speed injection system, high precision and high rigidity clamping machine 构, can processing 0.1～0.3g heavy precision micro type plastics parts, applications 包括数码 versus machine, machine, hard 盘, fine connectors and other and other. Japan made 钢 也 development 出J-ELII-UPS ultra-high speed precision injection molding parts molding machine. in standards holding pressure conditions lower, products weight 变动幅 degree is 0.022 克, using/adopting new holding pressure control methods rear, products weight 变动幅 degree can decrease small to 0.006 克.