汽车天窗边框塑件模具结构设计及其翘曲变形控制
汽车天窗边框塑件模具结构设计及其翘曲变形控制(任务书,开题报告,论文说明书13000字)
摘 要
此次设计的主要目的是对汽车天窗边框塑件进行结构分析,设计一套能够实现其注塑成型的模具,然后通过工艺参数优化控制其注塑成型过程中出现的翘曲变形。
首先利用Moldflow软件对汽车天窗边框塑件进行了注塑模拟分析,得到初始工艺条件下的翘曲变形情况,然后通过控制变量法进行对比分析,在保持其他条件与初始工艺条件相同的情况下,改变注塑的熔体温度为280℃、290℃、300℃、310℃、320℃,保压压力为110MPa、120MPa、130MPa、140MPa、150MPa,型腔大小为1.005倍、1.01倍的情况下分别进行注塑模拟实验,得到多组制件翘曲变形结果。然后对制件进行结构分析,制订了模具的总体方案,对模具的流道系统、成型零部件、定距分型机构、侧抽芯机构及冷却水道进行了设计计算。
实验表明熔体温度为290℃时,制件注塑过程收缩更加均匀,可以减少由于收缩不均引起的翘曲变形从而减少制件的总体翘曲变形;保压压力为150MPa时,制件由于收缩不均和取向效应变形减小从而使得其总翘曲变形减小;型腔大小越小,制件的翘曲变形量越小。通过工艺优化,将制件工艺参数设为熔体温度为290℃,保压压力为150MPa,型腔大小为原始大小进行模拟分析,得到制件翘曲变形量为0.96mm,相较于初始工艺条件减少了0.29mm。
[资料来源:http://Doc163.com]
由于零件尺寸较大,应采用多点浇注,故选用三板式细水口模具,然后根据成型零部件尺寸选用了合适大小的模架,并且根据模具设计手册对模具的各个部分的零部件进行了设计计算。
关键词:注塑模拟分析;翘曲变形;三板式细水口模具;侧抽芯机构
Abstract
The main purpose of this design is to analyze the structure of automobile skylight frame, design a set of mold to achieve its injection molding, and then through the process parameters to optimize the control of its injection molding process of warping deformation.
Firstly, Moldflow software was used to simulate the plastic parts of automobile skylight frame. The warping deformation was obtained under the initial process conditions. Then, the control method was used to analyze and analyze the same conditions. Under the same conditions and the initial process conditions, Injection molding of the melt temperature of 280 ℃、290 ℃、300 ℃、310 ℃、320 ℃, packing pressure of 110MPa、120MPa、130MPa、140MPa、150MPa, cavity size 1.005 times、 1.01 times the case of injection The results show that the warping deformation of the multi - group is obtained. Then, the structural analysis of the parts is carried out, and the overall scheme of the mold is worked out. The design of the mold flow channel system, the forming parts, the distance classification mechanism, the side core pulling mechanism and the cooling water channel are designed and calculated. [资料来源:http://Doc163.com]
Experiments show that when the melt temperature is 290 ℃, the shrinkage of the injection molding process is more uniform, which can reduce the warping caused by the uneven shrinkage and reduce the overall warpage of the workpiece. When the packing pressure is 150MPa, Unevenness and orientation effect deformation reduced so that its total warping deformation reduced; smaller cavity size, the smaller the amount of warpage deformation.Through the process optimization, the process parameters of the parts were melt temperature 290 ℃, packing pressure 150MPa, cavity size for the original size of the simulation analysis, the workpiece warpage deformation of 0.96mm, compared to the initial process Condition reduced by 0.29mm.
As the parts of the larger size, should be multi-point casting, so the use of three-plate water nozzle mold, and then selected according to the size of forming parts of the appropriate size of the mold, and according to the mold design manual on the various parts of the mold parts were designed Calculation. [资料来源:http://www.doc163.com]
Key Words:Injection molding simulation analysis; warping deformation; three plate small nozzle mold;Side core pulling mechanismnozzle mold;Side core pulling mechanism
[资料来源:http://www.doc163.com]
目录
第1章 绪论 1
1.1论文研究的目的意义 1
1.2国内外发展现状 1
1.3论文研究内容 3
1.4技术方案 3
1.5 小结 4
第2章 汽车天窗边框塑件翘曲变形控制 5
2.1 Moldflow软件介绍 5
2.2汽车天窗边框塑件的前处理 5
2.2.1模型导入 5
2.2.2网格化处理 5
2.2.3材料选择 5
2.2.4流道系统的设置 5
2.2.5冷却系统的设置 6
2.3翘曲变形分析及优化方案 6
2.3.1初始工艺条件下的翘曲变形 6
2.3.2改变熔体温度后的翘曲变形分析 8 [来源:http://Doc163.com]
2.3.3改变保压压力后的翘曲变形分析 9
2.3.4改变制件型腔后的翘曲变形分析 11
2.3.5工艺优化方案 12
2.4小结 13
第3章 汽车天窗边框塑件模具结构设计 14
3.1产品分析 14
3.2注塑机的初步选择 15
3.3模具总体方案设计 16
3.3.1分型面的选择 16
3.3.2模具结构形式 16
3.4流道系统的设计 16
3.4.1主流道系统的设计 16
3.4.2分流道系统设计 17
3.5成型零部件设计 18
3.5.1型腔尺寸计算 18
3.5.2型芯尺寸计算 19
3.5.3成型零部件的壁厚计算 20
3.6模架的选择 21
3.7顶出机构的设计 21
3.7.1脱模力的计算 21
3.7.2推杆直径的确定 22
3.8侧抽芯机构的设计 23
3.8.1抽拔距的计算 23
3.8.2抽拔力的计算 23
3.8.3斜导柱尺寸计算 23
3.9导向及顺序定距分型机构的设计 24
3.9.1导向机构 24
3.9.2模具定距分型原理 24
3.9.3定距机构 25
3.10冷却系统的设计 25
3.11.注塑机的校核 26
3.11.1注塑压力校核 26
3.11.2锁模力的校核 26
3.11.3开模行程校核 26
3.11.4模具安装尺寸校核 27
3.12模具详细结构 28
3.13小结 29
第4章 总结 30
参考文献 31
附录 32
致 谢 33 [资料来源:http://Doc163.com]