制冷热交换器U型管自动成型机毕业设计-夹紧机构设计 、弯管机主机部分设计

毕业设计说明书

题目名称：制冷热交换器U型管自动成型机设计——夹紧机构设计、弯管机主机部分设计院系名称：

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20**年 03月

摘要

小U型管的弯制方法有很多，相应的设备也有很多，但大多数都是用手动或机械弯管机加工生产出来的，而且多为冷弯。在实际中通常是根据生产对U管的质量要求选择相应的弯管机进行加工。本课题旨在寻求一种新的弯管工艺，在保证弯管质量的前提下尽可能提高弯管的速度。

本着以上的目的，本课题研究设计了一款液压全自动U型管弯管机，所加工的管材为硬铜管。它具有生产效率较高，制造成本低。整台机器共有以下几部分组成：送料夹紧和送料机构、弯曲夹紧机构、弯曲机构和切断机构四大部分组成。除了切断机构是由一台功率为0.37kw的小功率三相异步电动机带动之外，其它的机构均采用了液压传动。弯管方式采用辗压。在弯管的过程中，定模保持不动，固定在旋转平台上的动模进行靠模完成管子的加工。

由于主要采用了液压传动的传动方式，和其它的液压设备相同，该液压全自动弯管机在传动上大为简化，缩短了传动链，从而提高了动力的传动效率。本设备可以一次完成两根管料的同时加工，所以加工效率较高。另外本设备还有一个很大的特点：在生产过程中采用了芯轴机构来减弱管子弯曲截面的椭圆度和内壁管子内壁的褶皱。同时由于芯轴机构中顶推弹簧的顶推作用，弯曲过程中管子外壁的开裂现象得到了很好的解决。

Abstract

There are many bending method of Small U-tube, so the corresponding device is a lot. But most bending machine is manual or mechanical processing, and mostly is cold .In practice; the select of bending machine is usually based on the quality of the production requirements on U tube. This topic seeks to find a new elbow technology, in ensuring the quality of pipe bends under the premise of improving the speed as much as possible.

In the above purpose, the research design of a hydraulic automatic U-tube bending machine, the processing of copper pipe as hard. It has higher production efficiency, low manufacturing cost. The whole machine is a total of the following components: Feeding clamping and feed mechanism, clamp body bending, bending bodies and cut off the bodies of four parts. In addition to cutting off body by a low-power power 0.37kw three phase induction motor drive, the other agencies are using a hydraulic transmission. Rolling Elbow is adopted. In the bending process, scheduled to die remain intact, fixed on the rotating platform, the dynamic model for the tube to complete the processing by the module.

Since the main use of the hydraulic drive transmission, and other similar hydraulic equipment, automatic bending machine of the hydraulic drive on the greatly simplified, reducing the transmission chain, resulting in improved power transmission efficiency. The device at once, while two pipe materials processing, so the processing efficiency is higher. The device also has a lot of features: in the production process used to weaken the tube bending mandrel body section of the ellipticity of the inner wall of the tube wall folds. At the same time pushing the mandrel institutions push the spring effect, the outer wall of the tube bending process of cracking phenomenon has been well addressed.

Keywords:Bender,Motor, Gear, Rack, Hydraulic cylinder

目录

目录 (3)

1管子弯曲方法的选择 (4)

1.1管料弯曲变形分析【1】 (4)

1.2常用弯管方法 (5)

1.3小弯曲半径管件的加工 (6)

1.4弯曲方法的拟定 (6)

2弯管机的总体设计拟定 (7)

2.1弯管机的总体机拟定及分析【2】 (7)

2.2弯管机总体机构的划分 (7)

3弯管机各机构的选择和设计 (8)

3.1靠模弯曲机构的设计【3】 (8)

3.2定模和夹块运动的设计 (8)

3.3弯管辅助机构——芯轴的设计 (8)

3.4顶镦装置的设计 (9)

3.5切断机构的设计 (9)

4齿轮齿条的参数计算和选定 (9)

4.1齿轮的拟定 (9)

4.2齿条的参数计算和拟定 (10)

5液压缸的设计 (10)

5.1液压缸主要参数的初步计算和拟定【4】 (10)

5.2液压缸的验算 (11)

5.3液压缸各部分结构形式的拟定 (11)