Aluminum alloy fittings processing technology methods and process characteristics

In today's industrial manufacturing, the adjustment of production structure has been gradually realized, which provides an opportunity for the development of the efficient and expansive application of aluminum alloy, which makes the application frequency of aluminum alloy in industrial production rise continuously due to its certain application advantages. Then there is aluminum alloy due to its outstanding physical and mechanical performance advantages. The following editorial to share with you about the technical methods of aluminum alloy parts processing and process characteristics, welcome to read!

Technical methods of aluminum alloy parts processing:

1. Machining benchmark selection

The machining datum should be consistent with the design datum, assembly datum and measurement datum as far as possible, and the machining process should give full consideration to the stability, positioning accuracy and clamping reliability of the parts.

2.Rough machining

As the machining dimensional accuracy and surface roughness of some aluminum alloy parts are not easy to meet the high precision requirements, it is necessary to carry out rough machining on some parts with complicated shapes before machining, and cut them in combination with the characteristics of aluminum alloy materials. The heat generated in this way will lead to cutting deformation, increase the error of part size to different degrees, and even lead to deformation of the workpiece. Therefore, for the rough machining of general flat surfaces, milling is used. At the same time, coolant is added to cool the workpiece to minimize the effect of cutting heat on machining accuracy.

3. Finishing

In the process of processing, high-speed cutting will produce a large amount of cutting heat, although the debris can take away most of the heat, but in the blade can still produce extremely high temperatures, due to the low melting point of aluminum alloy, the blade is often in a semi-molten state, so that the strength of the cutting point is affected by the high temperature, which is prone to produce aluminum alloy parts in the processing of the formation of concave and convex defects. Therefore, in the finishing process, usually choose the cutting fluid with good cooling performance, good lubrication performance and low viscosity. In the lubrication tool, timely take away the cutting heat, reduce the temperature of the tool and parts processing surface, reduce the parts temperature deformation.

4. Reasonable choice of cutting tools

Compared with ferrous metals, aluminum alloy material in the cutting process produces relatively small cutting force, you can use a larger cutting speed, but it is easy to form a debris tumor. The thermal conductivity of aluminum alloy is very high. Due to more heat from the chips and parts during the cutting process, the temperature of the cutting area is lower and the durability of the tool is higher, but the temperature rise of the parts themselves is faster, which is easy to cause deformation. Therefore, choosing the right tool material, selecting a reasonable tool angle and improving the tool surface roughness are very effective in reducing the cutting force and cutting heat.

5. The use of heat treatment and cold treatment to solve the processing deformation

Eliminate aluminum alloy material processing stress heat treatment methods are: artificial timeliness, recrystallization annealing, etc.. Simple structure of the parts process route is generally used: roughing, artificial timeliness, finishing. For the complex structure of the parts process route, generally used: roughing, artificial timeliness (heat treatment), semi-finishing, artificial timeliness (heat treatment), finishing. In the roughing and semi-finishing arrangements after artificial timeliness (heat treatment) process at the same time, can be arranged after the parts finishing stable heat treatment process, to prevent the parts placed, installed, the use of the process of small size changes.

Process characteristics of aluminum alloy parts machining:

(1) It can reduce the effect of residual stress on machining deformation. After the completion of rough machining, it is recommended to use heat treatment to remove the stress generated by the rough machining of the parts, in order to reduce the impact of stress on the quality of finishing.

(2) Improve machining accuracy and surface quality. After the separation of roughing and finishing, finishing is just a small machining allowance, small machining stress and deformation, which can greatly improve the quality of parts.

(3) Improve productivity. As rough machining only removes excess material, leaving enough margin for finishing, it does not take into account the size and tolerances, effectively utilizing the performance of different models of machine tools to improve cutting efficiency.

After cutting aluminum alloy parts, the metal organization in the processing table will change greatly. In addition, the effect of the cutting motion leads to greater residual stress. In order to reduce the deformation of the part, it is necessary to fully release the residual stress of the material.

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