加工喷油泵体(材料HT 20-40,图1)φ23_0~(+0.02)mm孔时,其孔的表面粗糙度始终达不到设计要求(Re2.5)。为此,我们研制了硬质合金无刃铰刀(图2)对内孔进行挤压加工,效果很好。一、挤压加工原理硬质合金无刃铰刀是根据挤压加工原理设计的一种铰刀,是一种旋转的挤压加工。它利用金属的塑性,使 When machining the injection pump body (Material HT 20-40, Fig. 1) φ23_0 ~ (+0.02) mm hole, the surface roughness of its hole can not reach the design requirement (Re2.5). To this end, we developed a carbide non-edge reamer (Figure 2) of the hole for extrusion processing, the effect is very good. First, the principle of extrusion machining Carbide bladeless reamer is based on the principle of extrusion machining designed a reamer, is a rotary extrusion process. It makes use of the plasticity of the metal