Process Design and Experiment for Turning External Thread with Axial Stratification

• 1、School of Mechnical and Power Engineering,Harbin University of Science and Technology,Harbin 150080
• 2、Qiqihar NO.2 Machine Tool(Group)CO.,LTD., Qiqihar 161000

Abstract：The alternating axial stratified turning method by left and right cutting edges of tool is adopted in turning large pitch external thread. When the cutting times of left and right cutting edges are too few, the size accuracy and machined surface quality of left and right thread surfaces cannot meet the consistency requirement. While too many cutting times not only reduce the cutting efficiency, but also increase the tool flank wear and the difference of wear width of left and right flank. The machined surface quality consistency of large pitch external thread also cannot meet. According to the process requirement of axial stratified turning, the external thread tools with different cutting edge radius and corner radius are designed. Two cutting process experimental schemes with different feed order, machining allowance and cooling lubrication conditions are put forward. The above tools and process schemes are used to turn Pitch 16mm external thread. The tool flank wear width and the surface roughness value of thread surface are extracted. The impact of the change of variables in the process scheme on the tool flank wear width and its consistency are revealed. Simultaneously, the machined surface roughness value and its consistency of the left and right thread surfaces are shown. These variables include cutting edge radius, corner radius, feed order, machining allowance and cooling lubrication conditions. The above results can be used for the process scheme design of turning external thread with axial stratification.

Keywords： mechanical manufacturing process and equipment external thread large pitch axial stratified turning tool process scheme design