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内螺纹低频振动冷挤压加工是通过挤压丝锥棱齿的振动挤压,将传统内螺纹冷挤压加工中的干摩擦状态转变为更有利的边界摩擦状态,从而改善传统内螺纹冷挤压加工过程中冷却润滑液不易进入挤压区的严重缺陷。通过试验可知:随着激振频率的不断增大,挤压扭矩呈不断增大趋势;随着激振力的不断增大,挤压扭矩呈现为先减小后增大的趋势;随着激振力臂长度的不断增大,挤压扭矩总体呈不断增大的趋势。在其他工艺参数相同条件下,低频振动冷挤压可以进一步提高传统内螺纹的牙高率和改善牙顶处凹陷的缺陷,从而提高冷挤压内螺纹的抗疲劳强度及获得更好的表面形貌。
Internal thread low-frequency vibration cold extrusion process is through the extrusion tap tooth vibration extrusion, the traditional internal thread cold extrusion processing of dry friction state into a more favorable boundary friction state, thereby improving the traditional internal thread cold extrusion Cooling process cooling fluid difficult to enter the extrusion zone serious flaw. Through the test we can see: with the continuous increase of excitation frequency, the extrusion torque is increasing. With the increasing of the exciting force, the extrusion torque presents the trend of first decreasing and then increasing. Vibrating arm length continues to increase, the overall extrusion torque is an increasing trend. Under the same conditions of other process parameters, low-frequency vibration and cold extrusion can further increase the tooth height of the traditional internal thread and improve the defects of the top of the tooth, thereby improving the fatigue strength of the cold extrusion internal thread and obtaining a better surface shape appearance.