齿轮轴的冷挤压成型工艺毕业设计

齿轮轴的冷挤压成型工艺

摘要

本文主要对齿轮轴的冷挤压加工进行了分析研究。将齿轮轴由过去的切削加工工艺改变成冷挤压成形工艺，实现少废料加工，并改善齿轮轴制件质量，是加工方法的进步。

在过去齿轮的生产,主要采用滚、插、铣等传统工艺,但传统工艺加工的齿轮存在生产效率低和产品质量差等缺点。为了克服这些缺点,近年出现了渐开线齿轮的冷挤压加工工艺。采用该工艺加工渐开线齿轮,不但使生产效率大大提高,产品尺寸稳定,表面粗糙度低,材料利用率达70%~80%,而且冷挤压使工件表面产生压应力,可以增加产品的疲劳强度。基于冷挤压加工的优点,我们在生产中引进了这一加工工艺。

为了在制造齿轮轴时减少工艺不合理性所带来的误差及难以加工等现象，本课题主要介绍了齿轮轴的冷挤压加工，通过加工中挤压成型中受力的分析，解决细长轴挤压出现的镦粗变形情况及冷挤压工件的热处理方法。应此本课题的研究具有重要的现实意义。

关键词：齿轮轴；冷挤压；加工工艺，热处理

Abstract

Main gear shaft of cold extrusion processing were analyzed. Gear shaft from the previous machining process change into cold extrusion forming process, less waste processing, gear shaft and improve part quality, advances in processing methods.

In the past the gear production, mainly by rolling, insert, milling and other traditional techniques, but the traditional processing of gear has low production efficiency and poor product quality. In order to overcome these shortcomings, in recent years, the involute gear cold extrusion process. The processing technology of involute gear, not only improves the production efficiency, product size stability, low surface roughness, material utilization rate up to70%~80%, and cold extrusion of the workpiece to produce compressive stress, can increase the product fatigue strength. Based on the cold extrusion processing advantages, we in the production of the introduction of the process.

In order to reduce the process of manufacturing gear shaft is not reasonable and the difficulty of processing error caused by the phenomenon, this paper mainly introduces the gear 0axis cold extrusion processing, through the processing of extrusion force analysis, solve the elongated shaft extrusion of upsetting and extrusion workpiece heat treatment method. Should this topic research has the important practical significance.

Keywords: Gear shaft Cold extrusion Processing Heat treatment

目录

第1章绪论 (1)

1.1毕业设计选题的背景及意义 (1)

1.2冷挤压在国内外研究概况及发展趋势 (1)

1.2.1 冷挤压技术发展趋势 (2)

1.3冷挤压工艺对模具的要求 (2)

1.4冷挤压的特点 (3)

1.4.1冷挤压特点 (3)

1.4.2冷挤压的基本类型 (3)

1.4.3冷挤压的优点 (4)

1.4.4冷挤压缺点 (4)

1.5冷挤压模具的构造及特点 (5)

第2章齿轮轴成形工艺确定 (8)

2.1齿轮轴的结构分析 (8)

2.2冷挤压工艺的分析 (9)

2．3冷挤压几种工艺组合形式 (9)

2.4齿轮轴冷挤的理论基础 (10)

2.5冷挤压工艺方案设计 (10)

2.6齿轮轴冷挤压变形计算 (11)

第3章齿轮轴的加工 (15)

3.1基准的概念和分类 (15)

3.2毛坯直径的计算及优化 (15)

3.3各加工阶段的主要任务 (17)

3.4加工顺序的安排 (18)

3.5限制局部挤压镦粗办法 (18)

3.6拟定加工工艺路线方案 (20)

3.7冷挤压关键技术研究 (23)

3.7.1 冷挤压前期出来 (23)

3.7.2 冷挤压成形中的润滑 (23)

第4章总结 (26)

答谢词 (27)

参考资料 (28)