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在车床上加工普通螺纹时,通常是先用外圆车刀(或内孔车刀)将工件外圆(内孔)车至所要加工螺纹的大径(小径)尺寸,然后用螺纹车刀进行螺纹的车削加工。由这种方法加工出的螺纹,牙尖不是过尖就是过平,并经常出现牙尖破损,表面粗糙度值很难达到R_(?)1.6。由于螺纹车刀多采用手工刃磨,加工后的螺纹牙型角也很难保证60°。 成都工具研究所研制了一种新型硬质合金可转位
When machining ordinary threads on a lathe, it is common to first use the outer turning tool (or inner turning tool) to drive the outer circumference (inner hole) of the workpiece to the larger diameter (smaller diameter) of the thread to be machined and then use a thread turning tool Thread turning machining. Threads machined by this method do not tip sharp or flat, and often have sharp cusp tips, making it difficult to achieve surface roughness R _ (?) 1.6. Due to the use of manual screwdriver sharpening, machining angle of the screw thread is also difficult to guarantee 60 °. Chengdu Tool Research Institute has developed a new type of cemented carbide indexable