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精密套类零件采用同时挤孔和碾压外圆的联合加工工艺时,能显著地简化其机械加工的工艺过程,可取消车削、镗孔、拉削、铰孔和磨削及其它等精加工工序。用新工艺法加工套类零件时,仅需两个基本工序——粗车外圆或镗孔,接着进行无切削挤孔和碾压外圆的联合加工。当联合挤孔和碾压外圆时,沿轴向推动以一定的压紧量夹在挤孔刀和碾压模之间的制件,使其壁厚变薄。金属材料变形形式接近四周受压缩,因此该工艺能确保零件得到高度的强化。加工精度相当于2～3级,表面不平度参数Ra=1.25～0.16微米(MKM)。经研究得知,用新工艺法加工过的零件表面显微硬度
Precision sleeve parts with a simultaneous machining of extrusion holes and roller compacts significantly simplify the machining process and eliminate finishing such as turning, boring, broaching, reaming and grinding, and other finishing Process. With the new process for the machining of sleeve parts, only two basic steps are required - the roughing of the outer circumference or boring of the roughing carcass, followed by the joint machining of a non-cutting hole and a rolling outer cylinder. When the joint extrusion hole and rolling the outer circle, along the axial push to a certain amount of clamping sandwiched between the squeeze cutter and rolling die parts, making it thinner wall thickness. The deformation of the metal material is nearly compressed around, so the process ensures that the part is highly strengthened. Processing accuracy is equivalent to 2 to 3, the surface roughness Ra = 1.25 ~ 0.16 microns (MKM). The study shows that, with the new method of processing parts of the surface microhardness