大螺距螺纹的有些螺杆由于结构的需要;螺尾部设计时不允许有退刀槽。其螺纹底部到螺纹顶部有一过渡圆弧。在一般情况下,这种螺杆的加工是很难的,我们采用方法如下:在加工100吨摩擦压力机上的大螺杆,其导程为108mm/3的方牙螺纹,先在车床上按其导程加工出深为0.5mm 左右的螺旋线,再在卧铣上用三面刃铣刀(T 型螺纹可用角度铣刀),按螺旋线尾部的位置,卧 Due to the structural requirements of some screws with large pitch threads, there is no allowance for undercut design. From the bottom of the thread to the top of the thread has a transition arc. Under normal circumstances, this screw is difficult to process, we use the following method: In the processing of 100 tons of friction presses on the large screw, the lead is 108mm / 3 square thread, first in the lathe according to its guide Cheng processing deep about 0.5mm spiral, and then lying on the milling cutter with three edges (T-thread available angle milling cutter), according to the location of the tail of the spiral, lying