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如图所示标注的齿轮,是泵轮驱动轴,长200毫米,壁厚2毫米,轴上的锥齿轮齿面径向跳动精度要求高,需承受很高的动载荷,要求锥齿轮具有很高的弯曲疲劳强度和足够的接触疲劳强度,因而采用优质合金钢制造,并对齿面进行渗碳淬火,渗碳深度0.6～0.9毫米,硬度HRC>54,非渗碳表面硬度HRC为35～43,要求其表面强化而心部具有较高的屈服强度和韧性。由于热处理后变形大,又不再对锥齿轮进行加工,而靠磨削零件的外圆和两端面来保证零件锥齿轮齿面的径向跳动精度。这就要求作为热处理后磨削该零件外圆和两端面的基准,即两端的60°定心锥面一定要与锥齿轮的节锥同心。为此设计了如图所示的心轴夹具进行倒棱。
The gear marked in the figure is the drive shaft of the pump wheel, with a length of 200 mm and a wall thickness of 2 mm. The bevel gear tooth flank of the shaft requires high radial runout accuracy and has to bear a high dynamic load. The bevel gear is required to have a very high High bending fatigue strength and sufficient contact fatigue strength, which is made of high quality alloy steel, and the tooth surface carburizing and quenching, carburizing depth of 0.6 to 0.9 mm, hardness HRC> 54, non-carburized surface hardness HRC 35 ~ 43, requiring its surface to strengthen the heart has a higher yield strength and toughness. Due to the large deformation after heat treatment, the bevel gear is no longer processed, but the outer bevel and the two end faces of the grinding part are used to ensure the radial runout accuracy of the bevel gear tooth surface of the part. This requires grinding as the heat treatment after the cylindrical and the two parts of the reference surface, that is, both ends of the centering cone of 60 ° must concentric with the bevel cone section. Designed for this purpose as shown in the mandrel jig for chamfering.