摘要针对CS/LM1型7.62毫米通用机枪为保证闭锁间隙和击针突出量需要在装配时进行修挫，装配效率和产品质量低的问题，本毕业设计开展相应的尺寸链公差计算和免修挫技术方案研究。本文介绍了CS/LM1型通用机枪的基本情况和结构特点，概述了极值法计算尺寸链的方法，枪械尺寸链对射击精度、可靠性、加工制造成本、生产效率等有重要影响。利用尺寸链公差计算分析软件对该机枪尺寸链中的闭锁间隙尺寸链和击针突出量尺寸链进行了详细的分析计算。提出将零件的固定设计尺寸变为可调整的浮动尺寸，在装配过程中完成调整封闭环尺寸的具体设计方案，使闭锁间隙与击针突出量达到无修挫合格要求。并针对两项设计方案设计出对应的专用量具，为解决该机枪装配过程中的实际问题提供了有效技术途径。47986

关键词  闭锁间隙  击针突出量  无修挫合格方案   专用量具设计

毕业论文设计说明书外文摘要

Title  Dimension chain analysis and calculation of CS/LM1 type 7.62 mm universal machine gun                     

Abstract

For CS/LM1 type 7.62mm general purpose machine gun in order to guarantee the closed space and hit needle protruding amount needed in the assembly of repair, low assembly efficiency and the quality of the products, the graduation design to carry out the corresponding dimension chain tolerance computation and exemption contusion and technical scheme of the study.This paper introduces the basic situation and construction features of CS/LM1 type general purpose machine gun. An overview of the extreme value method to calculate the dimension chain method and weapon size chain on firing accuracy, reliability and processing manufacturing cost and production efficiency has important influence. By using the dimension chain tolerance calculation and analysis software, a detailed analysis is made on the size chain of the locking clearance and the striking needle protrusion of the machine gun. The parts of the fixed size of design variable for adjustable floating dimensions, in the assembly process to complete the adjustment closed to the specific design of the ring size, the closed space and click needle protruding amount to repair eligibility requirements. And the corresponding special measuring tools are designed according to the two design schemes. Solve practical problems in the assembly of firearms.

Keywords  lock clearance  striking needle  non repair and contusion  special measuring tool design

目录

1 引言 1

1.1  课题的工程背景 1

1.2  课题相关领域国内外研究状况 1

1.3  课题内容 4

2  CS/LM1型通用机枪及尺寸链计算原理 5

2.1  CS/LM1型通用机枪 5

2.2  尺寸链及其计算原理 6

2.3  闭锁间隙与击针突出量的定义 11

3  尺寸链分析与计算 12

3.1  闭锁尺寸链分析与计算 12

3.2  击针突出量尺寸链分析与计算 16

4  闭锁尺寸与击针突出量无修挫合格技术方案及量具设计 19

4.1  闭锁尺寸无修挫合格技术方案及量具设计 19

4.2  击针突出量无修挫合格技术方案及量具设计