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改进连杆螺栓孔的加工工艺,是提高连杆质量的关键问题。我厂加工某型柴油机连杆(见图1)螺栓孔挤压螺纹,对连杆螺纹底孔的要求如图2所示。连杆材料40Cr钢,调质处理硬度HB240～280。原工艺用连杆体、盖合一,在通用机床上分别钻、扩、铰两个螺纹底孔,扩螺栓过孔,倒角,再对连杆体上两个螺纹底孔分别进行两次攻丝。这种传统工艺很难保证螺纹的孔距公差、垂直度、螺纹精度和表面粗糙度。现改用连杆体、盖合一,在专用机床上同时用枪钻加
Improve the connecting rod bolt hole processing technology, is to improve the quality of connecting rod key issues. I plant a certain type of diesel engine connecting rod (see Figure 1) bolt hole extrusion thread, connecting rod thread bottom hole requirements shown in Figure 2. Connecting rod material 40Cr steel, quenching and tempering treatment hardness HB240 ~ 280. The original process with connecting rod body, covered one, respectively, in general-purpose machine were drilled, expanded, hinged two threaded bottom hole, bolt hole, chamfering, and then on the connecting rod body two threaded holes were twice Tapping. This traditional process is difficult to guarantee thread pitch tolerances, verticality, thread accuracy and surface roughness. Now use connecting rod body, covered one, while in the special machine with a gun drill plus