塑料盖注射模方案设计书.docVIP

毕业论文任务书 题 目： 塑料盖注射模设计 起 止 时 间： 2011年4月——2011年5月 学 生 姓 名： 学 号： 0841002551 班 级： 08模具5班 专业（全称）： 模具设计与制造 指 导 老 师： 2011年 6月11日 目录 1.塑件的工艺性分析 1.1制件的产品图···································3 1.2尺寸及精度·····································3 1.3 表面粗糙度····································4 1.4 脱模斜度······································4 1.5 塑件壁厚······································4 1.6 圆角··········································5 1.7 收缩率········································5 2.塑件的材料选择 2.1制件的材料选择································6 3.注射机的选择及型腔数的确定 3.1 注射机的选择··································7 3.2 型腔数的确定··································9 4.浇注的系统的设置 4.1主流道的设计··································11 4.2分流道的设计··································12 4.3浇口的设计····································12 4.4冷料穴的设计··································14 5.成型零部件的设计 5.1凹模设计·····································16 5.2型芯的设计····································16 5.3成型零部件工作尺寸的计算······················17 6.合模导向机构的设置 6.1 导柱··········································20 6.2 导套··········································21 6.3 导柱导套的配用································22 7.推出机构和复位零件的设计 7.1 推杆推板的设计·······························24 7.2 复位零件的设计·······························24 8.温度调节系统及排气系统的设计 8.1温度调节系统的设计·······26 8.2排气系统的设计·········27 9.试模与修模 9.1 装模··············27 9.2试模··············29 1.塑件的工艺性分析 1.1制件的产品图 1.2尺寸及精度 塑件尺寸在这里指的是塑件的总体尺寸，而不是壁厚、孔径等结构尺寸。塑件尺寸大小与塑件流动性有关。 塑件的尺寸精度是指所获得的塑件尺寸与产品的设计尺寸的符合程度，即所获塑件尺寸的准确度。影响塑件尺寸精度的因素很多，首先是模具的制造精度的磨损程度，其次是塑料收缩率的波动以及成型时工艺条件的变化，塑件成型后的时效变化和模具的结构形状等。因此，塑件的尺寸精度往往不高，应在保证使用要求的前提下尽可能选用低精度等级。 根据定义图纸的要求公差为自由公差，结合塑料制件公差数值标准SJ1372-78，4级，即一般精度标准。 1.3 表面粗糙度 塑件的外观要求越高，表面粗糙度值应越低。成型时要尽可能从工艺上避免冷疤、云纹等缺陷产生，除此之外，塑件的外观主要取决于