Shanghai Daoqin Plastics Co., Ltd.

        1, cooling separation or non-uniform

         in full cooling ejection, 顶杆 顶推 force make molding made parts deformation, therefore separation cooling strong/high demolding generate deformation. countermeasures is in mold cavity inner separation cooling, and other full hard rear can ejection. can reduce mold temperature degree, long cooling time. however, has mold local cooling separation, in usually molding conditions lower also has can anti deformation. this type of 情况应考虑变 more cooling water 路径, cooling water 道 位置 or add cooling 梢孔, especially 应考虑不 use water cold, using/adopting gas cooling and other methods.

        2, 顶杆造 formed

         has made parts demolding property defect, using/adopting strong/high demolding formed deformation. for easy deformation plastics made parts, this is generate deformation is generate cracks. for/regarding ABS and polystyrene (PS) made parts, this type of deformation is by 推项部位 发白 performance (参照 cracking, cracks, micro and 发白). its remove methods is improvement mold light, make its easy demolding, has use demolding agent can improved demolding. most 根本 改进 methods is abrasion type 芯, decrease small demolding retardant force, or increase large 拔模斜 degree, in easy ejection increase 设顶杆 and other, more ejection methods more important.

        3, molding 应变引起

         molding 应变造 formed deformation main/primary is molding shrinkage in direction upper 差异, thick generate. therefore, improve/increase mold temperature degree, improve/increase material temperature degree, reduce injection pressure, improvement system flow conditions and other can decrease small shrinkage rate in direction upper value. can is, more molding conditions large more difficult positive, this 时就需改变 gate and 数目例如 molding long parts need from 一端注入 and other.

         has 时必需改变 cooling water 道 配置; relatively long thin sheet/slice type made parts more easy deformation, has 时需变 more made parts local design in its upper 翘一侧 背面设置 add strong/high and other. utilizing 辅助工 tool cooling positive this type of deformation large more is has 效. can positive 时, must positive mold design. its in, most important is attention/notes make products thick 一致. in already lower, good through amount products deformation, versus direction positive mold, add positive.

        4, crystallization property plastics

         shrink rate relatively large resin, generally is crystallization property resin (如 polyoxymethylene (POM), nylon, polypropylene (PP), polyethylene (PE) and PET resin and other) ratio non crystallization property resin (如PMMA resin, polyethylene (PE), polystyrene (PS), ABS resin and AS resin and other) deformation large, another, due to glass fiber reinforcement resin tool has fiber toward property, deformation large.

         due to melt temperature degree scope/range narrow more generate deformation, and is difficult positive. crystallization property plastics crystallization degree cooling speed degree different 而变化, 即急剧 cooling crystallization degree reduce, molding shrinkage decrease small, slow cooling crystallization degree rise high, molding shrinkage increase large. crystallization property plastics deformation 特殊矫 positive method is utilizing this — property 质.

        实际 upper use positive method is make 动, has temperature 差. is make warpage 另一面 generate temperature degree, can positive deformation. has this temperature high 达20℃ above, must separation uniform distribution. must 指出, in design crystallization property plastics molding made parts and mold 时, 如不预先采取 especially anti deformation 手段, made parts deformation method use, make molding conditions to upper 述各项 requirements, large more 数情况 still can positive deformation.

        5, positive products warpage methods

         from mold in products if need positive, simple method need positive products in positive tool upper, in warpage add upper heavy material, must 明确决定 heavy material weight 同 放 位置.

         or warpage products in device upper, 一同放入 products heat deflection temperature (HDT) hot water in, simple use 手矫直. need attention/notes hot water temperature degree can high, 否则会 make products deformation more add 历害.

         warpage positive rear can in products upper has 斑痕.