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美帝Verson公司曾设计和制造了一套年产147,500,000件轴承套圈的冷挤压机,自动装置和模具。这些装备用于生产万向节轴承套,圆锥滚子轴承套圈,双列圆锥轴承套圈和推力轴承套圈。全部套圈由10条自动线进行生产。 万向节轴承套通常是在自动车床上加工的,目前已采用压力机冷挤压,生产率为54件/分,材料节省60%。冷挤压件的金属流线,不象自动车削那样被切断,所以零件强度比较好。试验表明:挤压的万向节轴承套没有在底部四周破坏的,而以前由棒料车削加工,底部破坏是一个很大的问题。 圆锥滚子轴承套圈冷挤压具有与万向节轴承套冷挤压的同样优点。由棒料加工的套圈流线与套圈轴线平行,因而流线被滚动表面切断,流线端部出现在受滚动压力的表面上,它加速了金属的疲劳,产生剥落,从而降低轴承的使用寿命。冷挤压套圈的流线沿套圈的外部分布,消除了不良的流线端面露出现象。材料经过冷加工,密度较大,能增加轴承静力学和动力学性能,延长了轴承使用寿命,并有可能采用比较便宜的钢材。 冷挤压套圈的后工序加工或终磨留量极小,因此零件的硬化表面完整的保留下来,这对轴承套圈是很有利的。
US-East Verson company has designed and manufactured a set of 147,500,000 pieces of bearing rings with cold extrusion presses, robots and molds. These equipment are used for the production of universal joint bearings, tapered roller bearing rings, double row tapered bearing rings and thrust bearing rings. All ferrules are produced by 10 automatic lines. Gimbal bearing housings are usually machined on automatic lathes and are currently cold pressed by press with a productivity of 54 pcs / min and a material saving of 60%. Cold extrusion of the metal streamline, unlike automatic turning that is cut off, so the strength of parts is better. Tests show that: the extrusion of the universal joint bearing sleeve is not damaged around the bottom, while the former by the bar turning machining, the bottom of the destruction is a big problem. Tapered roller bearing rings cold extrusion with universal joint bearing sleeve with the same advantages of cold extrusion. The flow lines of the ferrule machined from the bar are parallel to the axis of the ferrule such that the streamline is cut off by the rolling surface and the streamline ends appear on the surface subjected to rolling pressure which accelerates the fatigue of the metal resulting in flaking which reduces the Service life. The cold extrusion ferrule’s streamline is distributed along the outside of the ferrule, eliminating the undesirable flowline end-face exposure. After cold working, high density material can increase bearing static and dynamic performance, extend the bearing life, and may use cheaper steel. Cold extrusion ferrule after the process of processing or final mill residue, so the part of the hardened surface intact, which is very favorable bearing rings.