Shanghai Daoqin Plastics Co., Ltd.

        1. gate material difficult

         in injection molding process in, gate viscous in gate sleeve/set inner, easy 脱出. mold opening 时, products cracks loss 伤. in addition, as must use copper rod from nozzle 处敲出, make 之松动 rear can demolding, heavy effect/influence production efficiency.

         this type of fault/failure main/primary causes is gate light degree 差, inner 孔圆周 direction has 刀痕. its is material soft, use time rear small deformation or loss 伤, and nozzle 球面弧 degree small, make gate material in generate 铆头. gate sleeve/set relatively difficult processing, amount using/adopting standards parts, 如需自行 processing, 也应自 made or specialized 铰刀. 锥孔需经 研 abrasion 至Ra0.4 above. in addition, must gate material or gate ejection.

        2. large type mold 动定模偏移

         large type mold toward material speed rate different, and in 装模时受 mold heavy effect/influence generate 动, 定模偏移. in upper types lower, injection toward force will add in upper, mold opening 时导柱 surface 拉毛, loss 伤, heavy 时导柱 bending or 切断, 甚至无 method mold opening.

         is solution above issues, in mold separation type upper increase high strength 定位键四面各一, most has is using/adopting 圆柱键. 导柱孔 and separation 模面 垂直 degree important, in processing is using/adopting 动, for 准 位置夹紧 rear, in upper one-time 镗完, this can ensure 动, 定模孔 同心 degree, make degree most small. in addition, and sleeve/set hot hardness 务必达 to design requirements.

        3.导柱 loss 伤

        导柱 in mold in main/primary toward function, ensure type and type molding in 任何情况 lower versus 碰, can 以导柱 as is force parts or parts use.

         in types lower, injection 时动, will generate large toward force. parts thick requirements non-uniform 时, material through thick speed rate large, in generate relatively large pressure;塑 parts 侧面不 for 称, 如阶梯形 separation type mold versus for 两侧面 受 反 pressure versus and other.

        4.动模 sheet/plate bending

         mold in injection 时, mold cavity inner melt plastics generate large pressure, generally in 600~1000公斤/ cm. mold manufacturing has heavy issues, 往往改变原 design dimensions, or 者 动模 sheet/plate use low strong/high degree sheet/plate 代替, in use 顶杆顶 material mold in, due to base/seat large,造 formed injection sheet/plate lower 弯. 故动模 sheet/plate must selection excellent 质钢材, need has thick degree, can use A3 and other low strong/high degree sheet/plate, in necessary 时,应 in sheet/plate lower 方设置支撑柱 or block, decrease small sheet/plate thick degree, improve/increase can force.

        5.顶杆 bending, fracture or material

        自 made quality relatively good, is processing cost high, in generally use standards parts, quality need 差一. and 孔 间隙 if large, 则出现漏 material, if 间隙太 small, in injection due to mold temperature rise high, 顶杆膨胀而卡死. more is, has 时顶杆 by ejection generally 距离就顶不动而折断, in lower one-time clamping this 段露出 顶杆不 can 复位而撞 bad 凹模. is solution this issues, heavy new abrasion, in front 端保留10~15 mm combined 段, in separation abrasion small 0.2 mm. has in assembly rear,都必 must 严格检查起配 combined 间隙, generally in 0.05~0.08 mm inner, need ensure ejection machine can 进退自如.

        6. cooling defect or water water

         mold cooling 效果直接 effect/influence products quality and production efficiency, cooling defect, products shrinkage large, or shrinkage non-uniform 而出现翘面 deformation and other defect. 另一方面模 overall or local hot, make mold can positive molding 而停产, heavy make and other active parts hot 胀卡死而 loss bad. cooling system design, processing product 形状而定, need is mold structure complex or processing difficult this system, especially is large in type mold 一定s separation cooling issues.

        7. slip block 倾斜, 复位不顺

         has mold 因受模 sheet/plate 面积限 made, long degree small, slip block in 抽芯动 as rear 露出导槽 outer 面, this in rear stage/phase and clamping 复位初 stage/phase easy formed slip block 倾斜, especially is in clamping 时, slip block 复位不顺, make slip block loss 伤,甚至 pressure bad. according to experience, slip block formed 抽芯动 as rear, in slip inner long degree small 于导槽 full long 2/3.

        8.定距拉紧 machine 构失灵

        摆 钩, 搭扣之 type 定距拉紧 machine generally used for 定模抽芯 or 一 二次 demolding mold in, this category of machine in mold 两侧面 formed for 设置, its as requirements must 同步, clamping meanwhile 搭扣, mold opening to 一 定位置 meanwhile 脱钩. 一旦失 同步,势必造 formed by mold sheet/plate 歪斜而 loss bad, this machine parts need has relatively high rigid degree and wear resistance, adjustment very difficult, machine lifespan relatively short, amount use, can use other machine 构.

         in force comparison small lower can using/adopting elastic launch methods, in force comparison large lower can using/adopting rear type sliding, formed 抽芯动 as rear again separation structure, in large type mold upper can using/adopting liquid pressure 油缸抽芯. slip block 式抽芯 machine loss bad. this type of machine relatively 常出现 毛病 large more is processing upper to and use material small, main/primary has below/following issues.

        斜 销倾角A large, advantages is can in relatively short mold opening inner generate relatively large 抽芯距. is large 倾角A, 当抽拔 force F is value 时, in process in 斜销受 to bending force P=F/COSA, large, easy 出现斜销 deformation and abrasion loss. meanwhile,斜销 for slip block generate toward upper force N=FTGA也越 large, force make slip block for inner toward positive pressure increase large, from increase slip block sliding 时 摩 scratch retardant force. easy formed sliding 不顺, abrasion loss. according to experience, 倾角A不应 large 于25.

        9. injection molding mold in gas 不畅

         injection molding mold in has gas generate, this is what generate?浇注 system and mold type in has gas; has raw materials has has by drying troubleshooting water separation, it in high temperature lower gas formed water gas; due to in injection molding temperature degree high, certain property unstable plastics 会发生 separation understanding generate gas 体; plastics raw materials in certain additives or versus chemical reaction formed gas 体.

         meanwhile gas defect 不畅 缘由, need fast 找出. injection molding 模 排 gas defect will to parts quality and other more belt/tape series 危害, main/primary performance: in injection molding process in melt will type in gas 体, if gas 体排出不 and will formed melt 充填困 difficult,导致 injection amount 不足而不 can type 腔; troubleshooting gas in type in formed high pressure, and in pressure shrink degree lower 渗入至 plastics internal,造 formed 空洞, gas 孔,组织 hydrophobic and and other quality defect; due to gas by high degree pressure shrink, make type inner temperature degree upper rise,进而引起周围 melt separation understanding, 烧灼, make parts local carbon and phenomenon. it main/primary in melt combined 流处, gate 凸缘处; gas troubleshooting 不畅, make 进入各 type melt speed degree different, therefore easy formed flow and combined 痕,并 make parts force property can reduce; due to type in gas retardant 碍,会 reduce speed degree, effect/influence molding cycle, reduce efficiency.

        塑 parts in bubbles distribution, mold cavity in 积存空 gas generate 汽泡,常 distribution in and gate versus for upper; plastics raw materials in separation understanding or chemical reaction generate bubbles 则沿塑 parts thick degree distribution; plastics raw materials in water gas generate bubbles,则不规则 distribution in 整 塑 parts upper.