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90°直切口型连杆的体、盖是用两个連杆螺钉来定位与連接的。螺栓孔的光洁度为▽6,精度为2～3级,螺栓孔中心线对分开面的不垂直度允差为0.15/100。材料一般为中碳合金钢,调质处理HB241～293,国内工厂多采用钻,扩、铰工艺。存在问题是:孔的精度不易保证。由于材料韧性大,一般用高速钢铰刀,刀具寿命短,成本高;孔的光洁度不稳定。螺栓孔中心线对分开面的不垂直度允差也不易保证。因此成为連杆生产的关键工
90 ° straight incision connecting rod body, cover is connected and positioned by two connecting rod screws. The bolt hole finish is ▽ 6 with an accuracy of 2 to 3 and the tolerance of the non-perpendicularity of the centerline of the bolt hole to the separation surface is 0.15 / 100. Materials are generally carbon steel, quenched and tempered HB241 ~ 293, the domestic factory to use more drilling, expansion, hinge process. The problem is: the accuracy of the hole is not easy to guarantee. As the material toughness, the general high-speed steel reamers, tool life is short, high cost; hole finish is not stable. Bolt hole centerline on the separation of non-perpendicularity tolerance is not easy to guarantee. Therefore, the key link rod production