塑胶模具定料，求各种模具定材料时，怎么选钢件材料的材质如 （ABS,PC,POM,PVC）.等
推荐回答（1个）
塑 胶 材 料一、塑料的成份：树脂和添加剂添加剂：着色剂、润滑剂、增塑剂、填充剂。填充剂：1.ABS（30％玻璃纤维） 2.木粉填料3.石棉填料 4.云母填料 5.纸浆填料6.矿物填料二、塑料的分类：热塑性、热固性。用途分类：通用塑料、工程塑料三、常用塑料名称及密度、收缩率、模温、性能及用途。名称 密度 收缩率 模温 使用性能ABS 1.02-1.16 0.5％ 50-80 使用性、综合性好，流动性、收缩性好、吸水性大。电机外壳PS 聚苯乙烯 1.04-1.06 0.4％ 30-65 抗拉抗弯、透明性和化学性好、耐磨性差、成型性能好、收缩小。仪表壳、容器。PC 聚碳酸酯 1.02 0.6％ 90-120 防弹胶、透明料、粘度大、成型能和流动性差、冷却快、易产生内应力气泡、力学性好、抗拉弯冲击、易疲劳开裂不耐磨。镜片、手机镜片、医药容器。PP 聚苯烯 0.9-0.91 1.6％ 55-65 百折胶、使用性好、化学稳定性好、抗拉弯、易老化、成型收缩大、易产生收孔和缺陷、管件 、叶轮、阀门、瓶子。PE 聚乙烯 0.91-0.93 1.6％ 40-60 化学性能高、耐热性不高、耐寒性好、成型性流动性好、变形大易分解、收缩性大。电器、电线。POM 聚甲醛 1.41 1.7％ 90-120 塞钢使用性好、耐磨耐冲击、 耐热性差、易分解、化学性不好、成型好、尺寸好、精密。精密仪器轴承、精密仪器。PA6 聚酰胺 1.10-1.15 0.9％ 40-80 较硬耐磨耐冲耐压、耐热性差、收缩大、易产生收缩孔。轴承、滑轮、仪表。PMMA 聚甲基炳 1.17-1.20 0.5％-0.6％ 40-60 亚克力表面硬度不好、易擦伤、吸水性低、收缩小、尺寸准、粘度大。游标、仪表壳、车灯。PVC 聚氯乙烯 1.16-1.135 1.5％-3.0％ 60-80软 1.35-1.45 0.6％-1.5％ 60-80硬 抗酸碱性能强、化学稳定性好、成型差、容易变成黑色。薄膜、水管。四、塑料模塑工艺：1工艺过程、2工艺条件、3制品的工艺性、4常见塑料的缺陷及产生原因。1,工艺过程：A注塑前的准备 B注塑过程：1加料、2塑化、3注射4保压、5泠却、6脱模。C塑料制品的后处理。2,工艺条件：A温度 B时间 C压力 D泠却。3,制品的工艺性：A制品的尺寸、厚壁均匀。B制品的公差：IT12（12级） C表面质量（无斑点、条纹、划伤、气泡、变颜色） D形状 E脱模斜度（在产品指定的公差范围内）。4,常见塑料的缺陷及产生的原因：A填充不足：1、料筒、喷嘴及模具的温度偏低，2、加料量不够，3、注射压力过低，4、注射速度过慢，5、浇道浇口过小，6、模具排气不良，7、注射时间过短，8、流动慢。 B毛边：1、模温不足，2、注射压力过大、锁模力不够，3、模具变形有异物，4、模具排气不良，5、成型条件有问题，6、流动性太好。C气泡：1、塑料有水份，2、塑料分解（温度大），3、注射速度快，4、压力小，5、模温底，6、模具排气不良。D凹陷（缩水）：1、制品壁不均匀，2、 保压时间太短，3、注射压力不够，4、浇口位不当。E熔接痕：1、料温太低、流动性差.2、注射压力不够大.3、排气不良，4、塑料受污染.5、浇口位置（数目）不当。F制品表面有银丝及波纹：1.塑料有水份，2.料温太高或太低，3.浇口或流道尺寸太大，4.镶件温度低。G制品表面有黑点或条纹：1、塑料有分解，2、螺杆旋转速度快或背压过高，3、咀嘴与主流道没有对准，4、模具排气不良。H制品翘曲：1.模温高、冷却时间不够，2.壁厚不均匀，3.浇口位置不当或数目不够，4.顶出位置不当。I制品粘模：1、脱模斜度太小，2、模具有倒扣或倒勾，3、注射压力太高、时间长，4顶针J主流道粘模：咀嘴内径斜度不够、表面不光。L制品分层或脱皮：1塑料有异物或杂物，2、塑化不均匀。M制品褪色：1塑料干燥不够，2注射压力大、背压高，3、模具排气不良。N制品强度下降：1、塑料分解，2、熔接不良，3、模温太低，4、塑料回收次多。 大成模具设计
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