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为了提高攻丝精度、被加工表面光洁度和刀具尺寸耐用度,设计了一种带切削—挤光齿的丝锥(苏联发明证书号№483206)。这种丝锥(见图a)与一般丝锥不同之点在于每齿均作有挤光部分(塑性变形部分)(见图6),挤光部分在切削部分后面并向刃瓣背偏移。图B所示是前示图,图中的(?)角是切削锥角。挤光部分呈腰鼓形,其中径超过切削部分。丝锥尺寸按下述方法确定。挤光部分凸台中径d_(?)_2~B 根据被加工螺纹精度、被加工材料的物理机械性能、螺距和切削速度进行选择,它应比螺纹上限尺寸小0.02—0.04毫米,但比推
In order to improve the tapping accuracy, machined surface finish and tool size durability, a tap with a cutting-squeezing optocouple was designed (Soviet Invention Certificate No. 483206). This tap (see Figure a) differs from a typical tap in that each tooth has a light-extruded portion (plastically deformable portion) (see Figure 6) that is behind the cutting portion and is offset toward the blade back. Figure B shows the front of the figure, the figure (?) Angle is the cutting cone angle. Squeezed light part was drum-shaped, its diameter than the cutting part. Tap size is determined as follows. According to the accuracy of the thread to be machined, the physical and mechanical properties of the material to be machined, pitch and cutting speed, it should be 0.02-0.04mm smaller than the upper thread limit,