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发表于 2020-5-28 13:41:48 | 显示全部楼层 |阅读模式
When short mandrel pull system, wall to thinning, while the inner and outer surfaces of the tube are present friction,steel plate punch, resulting in non-uniform deformation of the metal in the air pull factors, in the short mandrel pull system is weakened, thus representing an empty metal deformation when pulling evenly, additional stress and residual stress generated is also small. (When is the use of a cylindrical mandrel) in the short mandrel pull system, under certain conditions, a mandrel rod system generates jitter. Jitter causes the pipe surface alternating light and dark rings, mold damage and loud noise. The basic reason for this is that the pull system jitter mandrel-way system is a flexible rod vibration system. Reaction force equilibrium the total friction force on the mandrel and pull the lever system in the elastic stretching process. If the positive pressure acting on the mandrel and the friction coefficient in the drawing process is frequently changing,cnc bus bar punch, the balance of the above conditions are constantly changing, the elastic deformation and the position of the mandrel rod is subsequently changing, causing a lever system to force the mandrel vibration and produce jitter.
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