论文部分内容阅读
我厂小四轮拖拉机变速箱体(图1)的材料是 HT21-40铸铁,其主要技术要求是:平面 P 和左右两侧面粗糙度为 R.6.3微米;12孔 A_1～A_6(双面)及6孔 B_1～B_3(双面)粗糙度 R.6.3微米,尺寸精度 K7(_(-0.021)~(0.009))。这些孔组成的孔系位置精度要求为同一轴线上的两孔对其公共轴线的同轴度φ0.04;两轴线相互之间的平行度φ0.10;6孔 B_1～B_3对 A_4的平行度φ0.20/350;左右两侧面对 A_1和 A_6轴线的垂直度是0.08/φ112和φ0.10/φ170。保证孔系位置精度是变速箱体加工的关
The material of the small four-wheel tractor transmission body (Figure 1) of our factory is HT21-40 cast iron. Its main technical requirements are: the plane P and the roughness on both sides of the left and right sides are R.6.3 μm; the size of the holes A_1 ~ A_6 (double-sided) And 6 holes B_1 ~ B_3 (double-sided) roughness R.6.3 microns, dimensional accuracy K7 (_ (- 0.021) ~ (0.009)). The hole system composed of these holes is required to have the position accuracy of the coaxiality of two holes on the same axis to its common axis φ0.04; the parallelism between two axes φ0.10; the parallelism of 6 holes B_1 ~ B_3 to A_4 φ0.20 / 350; the perpendicularity of the left and right sides facing the axes A_1 and A_6 is 0.08 / φ112 and φ0.10 / φ170. Hole hole to ensure the accuracy of the location of the transmission body processing off