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Causes of deformation in the processing of aluminum alloy stamping parts and improvement measures

by:Fortuna     2021-03-05
Stamping manufacturers produce stamping products of various materials. Among them, the coefficient of thermal expansion of aluminum alloy stamping parts is relatively large, especially when free forging blanks are used, the machining allowance is large, which increases the defect of deformation; aluminum alloy stamping parts Reasons for deformation during processing; there are many reasons for deformation, mainly including parts material, part shape, production conditions, cutting fluid performance have a certain relationship, mainly manifested as: the internal stress caused by the blank during the stamping process with the die Deformation caused by cutting force, deformation caused by cutting heat and deformation caused by clamping force; how to reduce the deformation in the processing of aluminum alloy stamping parts? 1. Reduce the internal stress of the blank; adopt natural or artificial aging and vibration treatment , Can partially eliminate the internal stress of the blank, and pre-processing is also an effective process method. For larger blanks, due to the large margin, the deformation may increase after processing. If the excess blank is processed first Part, reduce the margin of each part, and place it for a period of time in advance, which can not only release a part of the internal stress, but also reduce the deformation during processing; 2. Reasonably select the tool geometric parameters to improve the cutting ability of the tool; the material and geometry of the tool Parameters have an important influence on cutting force and cutting heat. The correct selection of tools is essential to reduce the deformation of parts; 3. Adjust the clamping method of aluminum alloy stamping parts; For thin-walled aluminum alloy workpieces with relatively poor rigidity, if you use The three-jaw self-centering chuck or spring chuck is clamped from the radial direction. Once it is released after processing, the workpiece will inevitably be deformed. At this time, the method of pressing the axial end face with better rigidity should be used. To locate the inner hole of the part, make a self-made threaded through mandrel, sleeve it into the inner hole of the part, press the end face with a cover plate on it, and back it with a nut. The clamping deformation can be avoided when the outer circle is processed, so that satisfactory processing accuracy can be obtained. When processing thin-walled and thin-plate workpieces, it is best to choose a vacuum chuck to obtain a uniform clamping force, and then process it with a small amount of cutting, which can well prevent the deformation of the workpiece. Article recommendation: How to prevent the occurrence of strain on automotive metal stamping parts? Previous post: How to prevent the occurrence of strain on automotive metal stamping parts?
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