Method for producing aluminium by colol extrusion

Abstract

The method for producing cold-extruded aluminum tube includes: 1. preparing at least a tube material of aluminium; 2. reducing calibre of one end of the tube material and changing it to small; 3. coating said tube material with lubricating agent; 4. cold-extruding treatment; preparing at least one eye mould and at least noe core shaft, inserting the core shaft into said tube material, pushing one end of said tube material which is undergone the process of head-reducing treatment of drive said tube material and make it pass through the mould eye of said eye mould to make said tube material be formed into the required aluminum tube. It can raise working quality and working speed, and can reduce consumption of aluminium material, and can reduce cost.

Description

【Technical field】 [0001] The invention relates to a manufacturing method for cold extrusion of an aluminum tube. 【Background technique】 [0002] Generally, aluminum alloys can be divided into two categories: heat-treated aluminum alloys and non-heat-treated aluminum alloys. These two aluminum alloys can be formed into aluminum tubes through extrusion (generally heated to 550°C), butt welding and other manufacturing methods. However, when the aluminum tubes of these two different materials are to be artificially strengthened, the following difficulties will be encountered: [0003] 1. Since non-heat-treated aluminum alloys can only be strengthened by cold rolling and cold forging, this kind of strengthening treatment is only applicable to plates or solid finished products, not to hollow aluminum tubes. Therefore, at present There is no effective way to artificially strengthen aluminum tubes of non-heat-treated aluminum alloys. [0004] 2. Although the aluminum tubes of heat...

AI Technical Summary

Problems solved by technology

[0003] 1. Since non-heat-treated aluminum alloys can only be strengthened by cold rolling and cold forging, this kind of strengthening treatment is only applicable to plates or solid finished products, not to hollow aluminum tubes. Therefore, at present There is no effective way to artificially strengthen the aluminum tubes of non-heat-treated aluminum alloys

[0004] 2. Although the aluminum tubes of heat-treated aluminum alloys can be strengthened by relevant heat treatment procedures (such as solution treatment, age hardening treatment, etc.), the strength of the aluminum tubes that can be improved by the heat treatment procedures is limited, and it will produce aluminum alloys. Tube deformation and dimensional instability

[0005] In addition, in order to meet the relevant size and precision requirements, the above-mentioned aluminum tubes need to undergo subsequent mechanical processing, such as turning, grinding, etc. Although this can make these aluminum tubes meet the relevant size requirements, but this Waiting for mechanical processing will lead to the following defects:

[0006] 1. Low processing accuracy, slow processing speed, and low processing stability: Since this kind of mechanical processing is processed by tools and abrasive tools, it is easy to reduce the processing accuracy due to processing errors, and the turning and grinding are originally equivalent. Labor-consuming and time-consuming processing. Therefore, with the increase of the length of the aluminum tube, the processing speed will be seriously slowed down. In addition, in the process of turning and grinding, the wear of tools and abrasives will cause processing Unstable quality, resulting in reduced processing stability

[0007] 2. High material consumption: Turning and grinding will consume a lot of aluminum tube materials. This will not only cause waste of materials, but also increase the cost of materials.

[0008] 3. High inventory rate: Because the size changes that can be processed by turning and grinding are limited, and if the range of turning and grinding is too large, it will lead to a substantial increase in material costs. Therefore, the industry must stock a variety of different sizes. Aluminum tubes are used to facilitate related mechanical processing, which leads to an increase in the inventory rate and inventory cost of the industry

[0009] 4. Low design variability: It can be seen from the general vehicle manufacturing technology that when the length of the aluminum tube is more than five times the diameter of the aluminum tube, the in-tube process of the aluminum tube will cause technical difficulties. When the length is more than eight times the diameter of the aluminum tube, the aluminum tube's external lathing will also cause technical difficulties. Machined to the required wall thickness and cross-sectional shape

[0010] 5. Low surface luminosity: After the aluminum tube is generally machined and ground, its outer surface will be covered with knife marks. Increased production costs

Images