提高轴类零件两端中心孔的加工质量,能保证此类零件加工的形状及位置精度,还能降低表面粗糙度。为此,我将一台Z512台钻,装上硬质合金的中心孔挤压刀具,改装成一台中心孔挤压机床。实现了对经过高频淬火的凸轮轴两端中心孔的挤压加工。中心孔挤压机床结构如图1所示。首先要保证挤压刀2和下顶尖4的同轴度,具体做法如下:(1)检查底板6和钻床主轴1的同轴度。(2)精磨一根直径稍大于挤压刀2及下顶尖4 Improve the processing quality of the central hole at both ends of shaft parts, to ensure the shape and position accuracy of such parts processing, but also reduce the surface roughness. To this end, I will be a Z512 Taiwan drill, fitted with cemented carbide center hole extrusion tool, converted into a center hole extrusion machine. Achieved through the high-frequency quenching camshaft center hole at both ends of the extrusion process. Center hole extrusion machine structure shown in Figure 1. First of all to ensure that the extrusion knife 2 and under the top 4 of the coaxiality, as follows: (1) Check the floor 6 and drill spindle 1 coaxiality. (2) Grinding a diameter slightly larger than the extrusion blade 2 and the lower tip 4