灯座塑料模具设计(1)

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1、目录第1章前言·························································1第2章塑件的工艺性设计·············································22.1注塑模工艺····························22.2化学和物理特性··························22.3塑件的尺寸与公差·························32.4塑件的结构工艺性分析·······

2、················42.5确定成型工艺参数·························4第3章成型零部件的设计·········································53.1型腔尺寸的确定··························53.2型芯尺寸的确定··························6第4章浇注系统的设计·······································64.1分型面的选择·············

3、················64.2确定浇口形式及位置·························74.3设计主流道及分流道形状和尺寸····················8第5章推出机构的设计······································105.1推杆的设计·····························105.2侧抽芯机构的设计··························10第6章注射机的选择·······················

4、·················126.1计算塑件的体积和重量························126.2模具闭合高度的确定和校核························126.3模具开模行程校核··························12第7章模架的选择··············································13绪论·························································

5、········14参考文献·····························································15谢致·································································16第1章前言第1章前言日用品，有时采用精度和强度不太高的塑料传动，由于塑料具有可塑性强，密度小、比强度高、结缘性、化学稳定性高、外观多样的特点，因而受到越来越多的厂家及人民的喜爱。塑料工业是新兴的工业，是随着石油工业

6、的发展而应而生的，目前塑料制件几乎已经进入一切工业部门以及人民日常生活的各个领域。随着机械工业电子工业，航空工业、仪器仪表工业和日常用品工业的发展，塑料成型制件的需求量越来越多，质量要求也越来越高，这就要求成型塑件的模具的开发，设计制造的水平也须越来越高。本文也就对日用品中的灯座模具设计过程进行阐述。第1页（共16页）第1章前言第二章塑料的工艺性设计2.1注塑模工艺干燥处理：如果储存适当则不需要干燥处理。熔化温度：220~275℃，注意不要超过275℃。模具温度：40~80℃，建议使用50℃。结晶程度

7、主要由模具温度决定。注射压力：可大到1800bar。注射速度：通常，使用高速注塑可以使内部压力减小到最小。如果制品表面出现了缺陷，那么应使用较高温度下的低速注塑。流道和浇口：对于冷流道，典型的流道直径范围是4~7mm。建议使用通体为圆形的注入口和流道。所有类型的浇口都可以使用。典型的浇口直径范围是1~1.5mm，但也可以使用小到0.7mm的浇口。对于边缘浇口，最小的浇口深度应为壁厚的一半；最小的浇口宽度应至少为壁厚的两倍。PP材料完全可以使用热流道系统。成型时间：注射时间20s~60s高压时间0s~3

8、s冷却时间20s~90s总周期50s~160s2.2化学和物理特性PP是一种半结晶性材料。它比PE要更坚硬并且有更高的熔点。由于均聚物型的PP温度高于0℃以上时非常脆，因此许多商业的PP材料是加入1~4%乙烯的无规则共聚物或更高比率乙烯含量的钳段式共聚物。共聚物型的PP材料有较低的热扭曲温度（100℃）、低透明度、低光泽度、低刚性，但是有更强的抗冲击强度。PP的强度随着乙烯含量的增加而增大。PP的维卡软化温度为150℃。由于结晶度较高，这种材料的表面刚度