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How Can Aluminum Parts Be Processed To Reduce The Processing Distortion Of Materials?

May. 27, 2019

Here is Oem Office Partition Aluminum Profiles manufacturer talking about How Can Aluminum Parts Be Processed To Reduce The Processing Distortion Of Materials.

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Aluminum alloys are important industrial raw materials. Since the hardness is relatively small, the coefficient of thermal expansion is large, and deformation is likely to occur in the machining of thin-walled and thin-plate parts. In addition to improving the tool performance and pre-aging treatment to eliminate the internal stress of the material, from the perspective of the processing technology, some means can be taken to minimize the deformation of the material.

Oem Office Partition Aluminum Profiles

Symmetrical machining method: For aluminum alloy parts with large machining allowance, in order to create better heat dissipation conditions and reduce thermal deformation, it is necessary to avoid excessive concentration of heat. The method that can be adopted is symmetric machining. For example, there is a 90 mm thick aluminum alloy plate that needs to be milled to a thickness of 60 mm. If one side is milled and then turned over to the other side, since each face is processed to the next dimension, continuous When the machining allowance is large, the problem of heat concentration will be caused so that the flatness of the milled aluminum alloy plate can only reach 5 mm. If the symmetrical processing method of repeated feeding on both sides is adopted, each surface is processed at least twice, until the size is reached, which is advantageous for heat dissipation, and the flatness can be controlled at 0.3 mm.


Layered multiple processing methods: When there are multiple cavities on the aluminum alloy plate parts to be processed, if one cavity is used to process one cavity sequentially, it is easy to wrap the cavity wall due to uneven force. Deformation. A better solution is to adopt a layered multiple processing methods, that is, to process all the cavities at the same time, but not once, but in several layers, layer by layer to the required size. In this way, the force of the part will be relatively uniform and the probability of deformation is small.


Proper selection of cutting amount: Choosing the right amount of cutting can effectively reduce the cutting force and cutting heat during cutting. In the machining process, the excessive amount of cutting causes the cutting force of one pass to be too large, which is easy to cause deformation of the parts, and also affects the rigidity of the machine spindle and the durability of the tool. Among the various factors of cutting amount, the influence on the cutting force is the amount of backing. It is said that reducing the amount of back-feeding is beneficial to ensure that the parts are not deformed, but at the same time, the processing efficiency is reduced. High-speed milling of CNC machining can solve this problem. It only needs to reduce the amount of back-feeding, increase the feed rate accordingly, and increase the speed of the machine tool, which can reduce the cutting force and ensure the processing efficiency.


The order of the passes is exquisite: roughing and finishing should use a different order of walking. Roughing requires cutting the excess material on the surface of the blank in a relatively short period of time at a faster cutting speed to form the geometric profile required for finishing. Therefore, the emphasis is on processing efficiency. In pursuit of material removal rate per unit time, up-cut milling should be used. Finishing requires higher machining accuracy and surface quality and emphasizes machining quality. Climb milling should be used. Since the cutting thickness of the cutter teeth gradually decreases from zero to zero during the down milling, the work hardening phenomenon is greatly reduced, and the deformation of the parts is also suppressed to some extent.


Secondary pressing of thin-walled parts: When processing thin-walled aluminum alloy parts, the pressing force during clamping is also an important cause of deformation, which is difficult to avoid even if the machining accuracy is improved. In order to reduce the deformation of the workpiece due to the clamping, the compacted part can be loosened before the finishing reaches the final size, the pressing force is released, the part is freely restored to its original state, and then re-squeezed slightly. The action point of the second pressing is better on the bearing surface, and the clamping force should be applied to the direction of the rigidity of the workpiece. The pressing force is such that the workpiece can be clamped without looseness, which is the experience and feel of the operator. Have higher requirements. The compression deformation of the parts thus machined is small.


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