重型刮板输送机是煤矿井下的主要运输设备之一,链轮是刮板输送机的重要驱动部件。链轮链窝在和圆环链啮合过程中承受着巨大的交变载荷和附加的冲击载荷，本研究课题针链轮在使用过程中频繁发生严重磨损造成链轮早期失效的问题，分析了其中的原因，进而采取两种改进方案：其一是制造链轮材质选用40CrNiMoA钢来替代原有的35CrMo和42CrMo，由于这三种材质同属合金钢，具有相近的机械性能和工艺性，所以，在其他机加工和热处理工艺都不改变的情况下，通过切片解剖的方式，对三种材质链轮的化学成分和硬度梯度进行了测定，结果表明,材质40CrNiMoA由于增加了合金元素Ni，提高了材质的淬透性，而且确保链轮齿面淬火硬度达到HRC48-58。由此可见，采用该新材质来制造链轮可以增加其耐磨性，从而提高链轮的使用寿命；其二是针对影响链轮与链环啮合性能和传动效率的关键部位——链窝，分析了影响其加工精度的原因，在此基础上，设计了加工链窝用的可转位硬质合金成型铣刀代替原来的整体高速钢成型铣刀，介绍了该刀具的结构、性能，又设计了合理的加工路线、加工程序、测量器具，经过反复加工实验，确定了合理的加工参数，经实践证明该硬质合金成型铣刀设计合理，加工质量稳定可靠，加工硬度高，便于安装维护，同时链窝加工方法合理可行，加工性能良好，经济效益明显，具有一定的推广价值。 最后，通过工业应用实验情况验证，在两种制造工艺方案下加工的链轮极大地提高了其耐磨性，进而提高了链轮的使用寿命，受到用户的好评，这充分说明该研究课题是正确、可行的。

Heavy Scraper conveyor is a coal mine transportation equipment, Sprocket wheel is an important drive components. sprocket wheel chain socket and round-link chain in the process of meshing endure alternating enormous impact load and additional load, in view of this,Aiming at the question of premature invalidation of sprocket wheel of my company that resulted in frequent bad abrasion in the process of being used, analyze this causation, and adopt two improved project, firstly, change the material of sprocket wheel being made from the steel of 35CrMo and 42CrMo to the steel of 40CrNiMoA, This three kinds of material have similar mechanical and technical capability, owing to together belong to alloy steel. under the circumstances of unchanging mechanical machining and heat treatment processes. By mensuring the chemistry component and rigidity grads of sprocket wheel made from three kinds of material by dissection way. As a result，we compared the steel of 40CrNiMoA with the steel of 35CrMo and 42CrMo, the steel of 40CrNiMoA still has a kind of alloy element of Ni. This element of Ni can improve quenching capability of material. And new material also can ensure the quenching rigidity of sprocket wheel’s tooth-face to attain HRC48-58. It shows that the new material can enhance the wearable capability of sprocket wheel thereby enhance using life-span of sprocket wheel.In addition.Aiming at the pivotal part-chain socket,which affects the meshing capability and transmission efficiency of sprocket wheel and round-link chain.The text analyzed the reasons which affect the machining precision，on this condition,designed the indexable cemented carbide molding milling cutter instead of primary molding milling cutter of high-speed steel. Which is used in the machining of sprocket wheel and the text introduced the structure and machining ability of this molding milling cutter.and designed logical machining route，machining programme and measuring implement,by machining repeatly and validating, finally made certain logical machining parameter. Practice proved that this design of molding cutter of cemented carbide is reasonable. The quality of machining is stable and credible, machining rigidity is high, Installing and maintenance are convenient, At the same time，the machining technique of sprocket wheel chain socket is logical and feasible, machining performance is very good, economic benefit is obvious, having the certain expansion value. In conclusion，by means of industry applications experiment validating, sprocket wheel manufactured by two manufacturing technics scheme improve greatly wearable capability of itself, farther enhance the using life-span of sprocket wheel, and make it reach international advanced level, this production is well admired by consumer, it fully show that this question of studying is right and feasible.