The working principle of cold rolling

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1, the precision cold rolling technology is in room temperature will ring rotary parts using extrusion and plastic deformation and get the finished part of a kind of cold forming method. Cold rolling work principle is consists of a main dri ve forming roll wheel to forming outside surface shape, a follower of forming core rod to forming inner surface shape, mandrel and workpiece by support roller bearing, rolling workpiece, roll wheel drive the workpiece rotate, mandrel in and feed unit solid united supporting wheel driven extrusion workpiece, so as to realize the workpiece rolling.ball bearing suppliers
2, cold rolling phase analysis
In the cold rolling process, the rolling pressure is not a constant, its as feed schedule change, has the obvious periodic, cold rolling pressure and stroke relationship can generally be divided into three stages:
The first â…  stage - compression deformation stage. Rolling start, supporting wheel mechanism began to feed, rolling pressure must overcome metal internal resistance to deformation and the friction between the blank and die, so that all the metal lattice is completely compaction, metal materials began to produce plastic deformation, rolling pressure increased sharply.
The first â…¡ stage -- stable deformation stage. Supporting wheel institutions continue to feed, forcing the metal continue to flow. In this stage, the only change blank height, deformation zone stability constant, plastic deformation zone height not changing over time, pressure is not as stroke and change, so called in the third stage plastic deformation zone height are called stable plastic deformation zone height. The height to when rolling pressure to achieve a minimum value, they can produce stable deformation principle to determine.ball bearing company
The first â…¢ stage - when billet residual thickness more than stable deformation zone height later, such as supporting wheel institutions continue to move forward, rolling pressure and rising sharply.
From the above analysis, we can conclude that the second stage end, if con tinue to rolling, the pressure will increase sharply. Therefore, at this time must end rolling, or die or rolling machine is easy to damage.
When the second phase is completed ends the whole rolling process, so, the rolling excess material thickness is the stable deformation height. If at the end of the second stage continue to rolling, the pressure will increase sharply. If limit increment not beyond mould allowable unit pressure, and according to the principle of rolling for more than the thickness of the material, so that can give full play to the ability of die material, and can save raw material loss. The rolling excess material thickness should be less than the stable deformation height. Usually, the second stage rolling is brought to an end.miniature bearing