毕业设计论文-皮带轮注塑模具设计.doc

天津职业技术师范大学
Tianjin University of Technology and Education
毕业设计
专业: 机械设计制造及其自动化
班级学号:
学生姓名:
指导教师: 教授
二〇一一年六月
天津职业技术师范大学本科生毕业设计
皮带轮注塑模具设计
The plastic belt-wheel mold design
专业班级:
学生姓名:
学院:机械工程学院
2011 年 6月
摘要
该设计是一款以聚***乙烯为材料的皮带轮模具设计,所选用的塑料成型方法是注塑成型。
该皮带轮设计是工程上用来固定三角皮带的标准件,因此设计时应遵循标准件的设计,在塑料件上不采用拔模角或者说拔模角为0°。对塑料知识了解之后,根据给定零件的形状尺寸、公差精度,结合塑件材料选择成型方式为注塑。确定型腔分布为一模两腔,根据制品的体积选择注射机为XS-ZY-250型;由制品材料的特性选择浇注方式,并设计成侧浇口形式。计算成形零件尺寸,设计材料的分型方式为斜导柱抽芯侧向分型机构。之后,设计推出机构。选择合适的模架,再细化每个零部件的位置配合关系。
最后进行校验,对斜导柱的强度进行校验,对注塑机的注射量、注射压力、开合模行程、模具高度与注塑机的关系进行校验。完成此设计。
关键词:注射模;XS-ZY-250注射机;聚***乙烯(PVC);侧向抽芯;一模两腔
ABSTRACT
This is a design of a belt-wheel die which made of polyvinyl chloride .The solution of the belt-wheel is plastic injection mold.
The belt-wheel is the standard work used in engineering which fix trigonal-strap, so we design it according the standard. It shouldn’t use the draft, or design the draft is 0°. After learning some knowledge of plastic, we choose the injector depend on the shape and the dimensional tolerances of the work piece, choose two cavities in one mold, choose XS-ZY-250 injector by the volume of the plastic work piece. Design the shot means is depend on the plastic’s characteristic, and adopt the edge gate. Calculate the size of the cores and the cavity, the structure of drawing cores used oblique post is to be adopted. Design the ejector framework and choose the standard mold bases. Then design the relationship of the other work piece in the whole mold.
Validate is the last thing. Validate the guide pin size and the shot capacity, injection pressure, open daylight of the injector. And the relation of the mold shut height with the injector size, so the design is over.
Key Words:plastic injection mold; XS-ZY-250 injector; polyvinyl chloride (PVC); oblique post drawing cores; two cavities in one mold
目录
1 绪论 1
1
2 塑料材料及选用 3
塑料的本色和牌号 3
塑料的特点 3
3
3
3
3
4
塑料的选用 4
3 注塑机及选用 6