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中心钻是工厂常用的刀具,其铲磨质量的好坏直接影响刀具的使用寿命和加工精度。我单位40发动机曲轴打两端中心孔带锪端面是采用两种较大的成形中心钻。另件是调质锻件,端面极不平,对中心钻有较高的技术要求,特别是两刃的对称摆差不得大于0.05毫米。原来我们采用一个专用夹具修磨,由于夹具设计和制造达不到技术要求,铲磨后的两刃摆差很大,一般在0.2～0.6毫米,大大超过刃磨的技术要求;加工当中打刃现象特别严重,造成刀具供不应求;其中心钻的价值较高,给国家造成很大的浪费。而且加工出来的中心孔精度低,直接影响曲轴的加工质量。原夹具的缺点是:1)装夹刀具不能保证其同心度,2)其
Center drill is commonly used in the factory tool, the quality of its shovel grinding tool directly affects the life and processing accuracy. My unit 40 engine crankshaft hit both ends of the center hole with 锪 end face is the use of two larger forming center drill. The other is quenched and tempered forgings, the end is extremely uneven, the center has a higher drilling technology requirements, in particular the symmetry of the two-edged difference should not exceed 0.05 mm. The original we use a dedicated fixture grinding, the fixture design and manufacture of less than technical requirements, after grinding two-edged swing great, usually 0.2 ~ 0.6 mm, greatly exceeds the technical requirements of grinding; processing blade The phenomenon is particularly serious, resulting in short supply of knives; the higher the value of the center drill, causing a great waste to the country. And machined out of the center hole low accuracy, a direct impact on the crankshaft processing quality. Disadvantages of the original fixture: 1) clamping tool can not guarantee its concentricity, 2) its