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以前在自动车床上加工小尺寸内螺纹时,一般选用际准切削丝锥。由于自动车床和攻丝机在攻制螺纹的方法上略有区别,故M2～M1.6小尺寸切削丝锥在自动车床上攻丝,明显表现出强度较差的弱点,经常造成校正齿的断面处扭断,而挤压丝锥具有无槽、强度好、耐用度高,很适合在自动车床上加工小尺寸内螺纹。一、切入锥角φ的造择丝锥在挤压过程中采用锥度挤入形式。确定锥度部分尺寸的原则是:不使相邻两个工作齿间的金属变形量过大或过小,即φ角不得过大或过小(见图)。在自动车上被加工的零件螺纹孔相当于盲孔螺纹,切
Before the automatic lathe machining small-size internal thread, the general choice of quasi-cutting tap. As the automatic lathe and tapping machine in the attack on the thread slightly different ways, so M2 ~ M1.6 small size tap cutting in the automatic lathe, the obvious weakness of the weakness, often resulting in correction tooth section Department of twist, while the extrusion tap with no groove, good strength, high durability, it is suitable for machining small-size automatic thread lathe. First, into the taper angle φ choice of tap in the extrusion process using taper into the form. The principle of determining the size of the taper is that the metal deformation between the two adjacent working teeth should not be too large or too small, that is, the angle φ should not be too large or too small (see figure). The machined parts threaded holes in the automotive are equivalent to blind hole threads, cut