蜗轮箱I的工艺规程和夹具设计【镗47孔夹具】【9张CAD图纸+毕业论文】【答辩通过】

摘  要

蜗轮箱I的工艺规程和夹具设计是一个贴近实际的毕业设计。该零件结构有一定复杂性，有两个主轴孔，并且有底面的大平面，因此零件毛坯采用灰铸铁铸造成形，箱体零件是一种典型零件，因此其加工工艺规程和夹具设计也具有典型性。在加工过程中，采用先面后孔的加工路线，以保证工件的定位基准统一、准确。为了消除由粗加工所造成的内应力、切削力、夹紧力和切削热对加工精度的影响，整个工艺过程中主要是先加工基准面，在加工其他的平面和孔，达到零件图上的要求。

对各平面加工时，首先是考虑定位，以保证平面的尺寸精度、相互位置精度和表面粗糙度，同时提高了生产率。箱体零件的轴孔是箱体零件的关键，因此我采用专用夹具——卧式镗床镗孔来保证各孔系的尺寸精度、平行度、同轴度等要求，对其他的油孔、螺纹孔、紧固孔的加工可放到最后进行。

蜗轮箱I的主要加工部位为两端面和轴孔。为了满足零件要求，采用专用铣床夹具和镗床夹具来进行加工，将大大提高产品质量和生产率。

关键词：夹具，镗模，余量，误差，精度

ABSTRACT

I worm me the process of order and fixture design is a graduate close to the actual design. Parts of the structure of a certain complexity, there are two spindle hole, and a large flat bottom, so parts of rough forming a gray iron foundry, cabinet parts is a typical parts, so its processing procedures and fixture design also has typical . In the process, using surface after the first hole of the processing line, to ensure that the workpiece positioning benchmark unified and accurate. In order to eliminate the rough caused by stress, cutting force, the clamping force and cutting heat on the accuracy of processing, the whole process is the first major processing base level, in the processing of the plane and the other hole, reaching parts of the map Requirements.

  On the plane processing, the first is to consider positioning, to ensure that the plane the size of accuracy, precision and location of each other surface roughness, while improving productivity. Parts of the box-axis is the key parts box, so I used special fixture - Boring horizontal boring machine to ensure the accuracy of the size of the hole, parallel, coaxial, and other requirements on other hole, thread Hole, fastening holes into the final processing can be carried out.

 I worm me the main processing sites at both ends of the shaft and the hole. To meet the requirements of spare parts, used for milling and boring machine fixture fixture for processing, will greatly improve product quality and productivity.

Key words: fixture, boring mode, margin of error, coa

目  录

5.1  镗主轴孔夹具设计25

5.2.2定位方案及定位元件设计26

5.2.3夹紧方案及夹紧元件设计26

5.2.4夹具体的设计26

5.2.5镗套，衬套的设计26

5.2.6定位元件的设计28

5.2.7 定位误差分析30

5.2.8镗削力与夹紧力计算31

5.2.9夹具精度的计算31

5.2.10 夹具操作的简要说明32

6  结论41

致 谢43

1  蜗轮箱Ⅰ加工工艺规程设计

1.1  零件的分析

1.1.1零件的作用

题目给出的零件是蜗轮箱I。蜗轮箱箱体的主要作用是支承各传动轴，保证各轴之间的中心距及平行度，并保证蜗轮箱各部件的正确安装。因此蜗轮箱箱体零件的加工质量，不但直接影响箱体内各个部件的装配精度和运动精度，而且还会影响工作精度、使用性能和寿命。蜗轮箱安装轴主要是实现能量的传递。在两个轴的端面都有挡盖，两个轴相互垂直安装，前后端面支承孔、左右端面支撑孔用以安装传动轴，实现其能量传递。