Shanghai Daoqin Plastics Co., Ltd.

injection molding mold is types production plastics products tool;也 is plastics products structure and dimensions tool. injection molding mold structure and mold processing quality effect/influence parts products quality and production efficiency. injection molding mold production and plastics products production in most Common, most 常出现 injection molding mold fault/failure causes and its troubleshooting methods detailed introduction lower:
 
    1. gate material difficult. in injection molding process in, gate viscous in gate sleeve/set inner,不 easy 脱出. mold opening 时, products cracks loss 伤. in addition,操 as must use copper rod from nozzle 处敲出, make 之松动 rear can demolding,严 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,以 and nozzle 球面弧 degree small,致 make gate material in generate 铆头. gate sleeve/set relatively difficult processing,应尽 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,必 must gate material or gate ejection machine 构.
 
    2.导柱 loss 伤. in mold in main/primary toward function,以 ensure type and type molding in 任何情况 lower versus 碰,不 can 以导柱 as is force parts or parts use. in below/following types lower, injection 时动,定模 will generate large toward force:(1).塑 parts thick requirements non-uniform 时, material through thick speed rate large, in generate relatively large pressure;(2).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.
 
    3. large type mold,因各 toward material speed rate different,以 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,严 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,定模 for 准位置夹紧 rear, in upper one-time 镗完, this can ensure 动,定模孔 同心 degree,并 make degree most small. in addition,导柱 and sleeve/set hot hardness 务必达 to design requirements.
 
    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,切不 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,以 decrease small sheet/plate thick degree, improve/increase can force.
 
    5.顶杆 bending, fracture or material. made quality relatively good,就 is processing cost high,现 in generally use standards parts, quality 差. and 孔 间隙 if large,则出现漏 material,但 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,结果 in lower one-time clamping this 段露出 顶杆不 can 复位而撞 bad 凹模. is solution this issues,顶杆 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,如 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,严 heavy make and other active parts hot 胀卡死而 loss bad. cooling system design, processing product 形状而定,不 need is mold structure complex or processing difficult this system, especially is large in type mold need separation cooling issues.
 
    7.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,因 this category of machine in mold 两侧面 formed for 设置, its as requirements must 同步,即 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,尽 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,先完 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,也越 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,此 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,导槽 abrasion loss. according to experience,倾角A不应 large 于25
 
    8. has mold 因受模 sheet/plate 面积限 made,导槽 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,留 in slip inner long degree small 于导槽 full long 2/3.
 
    9. most rear in design, manufacturing mold 时,应 according to parts quality requirements,批 amount large small, manufacturing requirements and other specific 情况,既 can meet/satisfy products requirements, in mold structure upper also most can 靠, easy processing, make low, production this mold is good.