Influence of lubricating fluid on forming quality of internal thread during cold extrusion
To improve the extrusion process and improve the forming quality of thread,taking 316 stainless steel as the test material,the test method was used to explore the effect laws of different lubricating fluids on the extrusion process and extrusion quality.Extrude form-ing tests of the internal thread were carried out under four kinds of lubricating fluid conditions.The variation curves of extrusion torque un-der different lubricating fluids and the teeth shapes of thread after forming were obtained.The microhardness of the teeth shapes of thread was measured.The test results show that the torque of thread is larger under dry extrusion condition.When the speed is 150 r·min-1,the torque of thread after lubrication is reduced by maximum of 32.8%compared with that of dry extrusion.When the speed is 200 r·min-1,the torque is reduced by maximum of 30.4%.Under the lubrication condition,the defect of thread tip is obviously reduced,the symmetry of teeth shapes is improved,and the microhardness of teeth shapes increases slightly.
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