攻制内螺纹时,丝锥折断是经常发生的事情,特别是在钢件上攻M12以下的通孔或盲孔内螺纹,当内螺纹的深度与直径之比等于或大于2.5时,往往使丝锥折断,造成刀具损失和工件报废。这是由于丝锥的强度低,切削阻力大,排屑不畅或丝锥磨损等原因。鉴于此,我们设计、制造了如图所示的保险攻内螺纹专用工具。在该工具中设计了一个我们称之为“过载缓冲离合器”的部件,使主轴与丝锥之间不是刚性动力传递,较好地防止或减少了攻螺纹过程中的丝锥折断现象的发生。 Tapping internal thread, the tap break is a frequent occurrence, especially in the steel up the M12 or blind hole through the blind hole, when the thread depth to diameter ratio is equal to or greater than 2.5, often make the tap Broken, resulting in tool loss and scrapped parts. This is due to the low strength tap, cutting resistance, poor chip removal or tap wear and other reasons. In view of this, we designed and manufactured the special tools for internal thread of insurance as shown in the picture. In this tool, we design a component that we call “overload buffer clutch”, which makes the spindle and the tap not rigidly transmit the power, so as to prevent or reduce the occurrence of tap breakage during tapping.