摘要：塑料制品如今广泛存在于人们的日常生活中，小到日常生活用品，大到汽车船舶领域。但塑料制品成型过程中偶尔会产生很多缺陷，例如熔接痕、气穴和翘曲等，影响塑件的成型质量及使用性能。因此，通过CAE技术模拟，预测缺陷，优化工艺参数，在此基础上进行模具设计，对于提高塑件的成型质量和使用性能具有重要的意义。

本文以工业缝纫机皮带罩为研究对象，首先对塑料制品的注塑成型工艺进行了研究，其次阐明了在注塑成型过程中经常出现的缺陷及其解决方法。然后通过正交实验方法对模具温度、熔体温度、保压压力、保压时间及注射压力五个工艺参数进行分析，研究各参数对塑件翘曲变形的影响。并获得最优的工艺参数组合，最后在此基础上对注塑模具的浇注系统、冷却系统、导向及脱模机构、分型及抽芯机构进行设计。

关键词：工业缝纫机皮带罩；Moldflow模拟分析；注塑成型；模具设计。

Abstract：Plastic products are now widely present in people's daily lives, small to daily necessities, large to the field of automotive ships. However, the plastic molding process will occasionally produce a lot of defects, such as welding marks, cavitation and warping, etc., affecting the quality of plastic parts and the use of performance. Therefore, through CAE technology simulation, prediction of defects, optimize the process parameters, based on the mold design, to improve the quality of plastic parts and the use of performance is of great significance.

In this paper, the industrial sewing machine belt cover as the research object, the first plastic injection molding process was studied, followed by clarification in the injection molding process often appear defects and solutions. The effects of the parameters on the warpage of the plastic parts were analyzed by orthogonal test method. The effects of the parameters on the warpage of the plastic parts were analyzed. And the optimal combination of process parameters is obtained. Finally, the pouring system, the cooling system, the guiding and stripping mechanism, the typeing and the core pulling mechanism of the injection mold are designed.

Key words: industrial sewing machine belt cover; Moldflow simulation analysis; injection molding; mold design.

目录

第一章 绪论 1

1.1研究背景 1

1.2国内外研究现状 2

1.3本课题的研究意义及研究内容 3

1.31研究意义 3

1.3.2研究内容 3

第二章 注塑成型技术及缺陷分析 4

2.1注塑成型过程 4

2.2注塑成型工艺参数 4

2.2.1熔体温度 4

2.2.2模具温度 5

2.2.3注射压力 5

2.2.4保压时间 5

2.2.5保压压力 5

2.3注塑成型过程中的缺陷分析 5

2.3.1熔接痕 5

2.3.2充填不足 6

2.3.3缩痕 6

2.3.4翘曲变形 6

2.3.5裂纹 7

2.3.6气穴 7

2.3.7溢边