Cause And Improvement Of Machining Deformation Of Mechanical Parts

DALIAN, China - Feb. 27, 2023 - PRLog -- 1. Analyze The Causes Of Deformation During Machining Of Mechanical Parts

1.1 Change Of Machining Accuracy Of Parts Due To Internal Force

In the process of lathe machining, it is usually to use the centripetal force to clamp the parts with the three-jaw or four-jaw chuck of the lathe, and then process the mechanical parts. At the same time, in order to ensure that the parts do not loosen under the force and reduce the effect of the internal force, the clamping force must be greater than the mechanical cutting force. The clamping force increases with the increase of cutting force and decreases with it. Such operation can make the mechanical parts stable in the process of processing. However, after the three-jaw or four-jaw chuck is released, the machined mechanical parts will be far different from the original ones, some will be polygonal, some will be elliptical, and there will be large deviation.

1.2 Deformation Is Easy To Occur After Heat Treatment

As for the thin mechanical parts, due to their large length and diameter, the straw cap is prone to bend after heat treatment. On the one hand, the phenomenon of bulge in the middle will occur, and the plane deviation will increase. On the other hand, due to the influence of various external factors, the parts will be bent. These deformation problems are not only caused by the change of the internal stress of the parts after heat treatment, but also because the operator's professional knowledge is not solid enough to understand the structural stability of the parts, which increases the probability of the parts deformation.

1.3 Elastic Deformation Caused By External Force

There are several main reasons for elastic deformation of parts in machining. First, if the internal structure of some parts contains flakes, it will have higher requirements on the operation method. Otherwise, when the operators locate and clamp the parts, they cannot correspond with the design of the drawing, which is easy to cause elastic deformation. The second is the unevenness of the lathe and fixture, which makes the force on both sides of the part uneven when fixing, resulting in the translation and deformation of the part under the action of the force on the side with small force during cutting. The third is that the positioning of the parts is unreasonable during the processing, which reduces the rigidity and strength of the parts. Fourth, the existence of cutting force is also one of the causes of elastic deformation of parts.

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