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齿宽大于70mm、模数4～6mm、中碳钢或中碳合金结构钢制造的圆柱齿轮,在煤矿机械产品中常用作中载或重载传动的关键零件。采用自喷式串联的双匝感应圈对齿轮进行高频连续加热淬火时,虽可使齿面取得三分之二齿高或全齿高的似仿形硬化层,但轮齿的齿向和内孔变形不易控制。通常以淬火前留放余量,淬火后磨削内孔、珩磨齿面的精整手段来达到齿轮精度要求。可是,对于非专业性齿轮制造单位,往往受到缺少专用设备的限制而难以实现。对此,我们本着现有设备条件和工件的不同要求,从试验中找出变形原因,并采取如下工艺措施。
Tooth width greater than 70mm, modulus 4 ~ 6mm, medium carbon steel or carbon steel structural steel cylinder gears, coal mine machinery products commonly used as a medium or heavy load transmission key components. Self-spray series double-turn induction ring gear for high-frequency continuous heating and quenching, although the tooth surface can be made two-thirds of the tooth height or all-tooth-like high profile like hardened layer, but the gear tooth direction and Hole deformation is not easy to control. Usually leave the balance before quenching, grinding after grinding bore, honing the surface of the finishing tools to achieve gear accuracy requirements. However, for non-professional gear manufacturing units, it is often difficult to achieve due to the lack of special equipment. In this regard, we in the existing equipment conditions and the different requirements of the workpiece, from the test to find out the causes of deformation, and take the following technical measures.