准确的钻头刃磨方法(国外英文资料).doc

正确的钻头刃磨方法(国外英文资料) Standard grinding methods and techniques BR standard twist drills are a very common drilling tool. The utility model has the advantages of simple structure and convenient sharpening, but the grinding method is really good, and the method and the skill of grinding are well mastered. Factories also have such a situation, the work of more than ten years of workers, grinding well, twist drill also quite a lot. What is the reason for this? The key is methods and techniques. If the method is mastered, the problem will be solved. BR students in the class in the process have been learned knowledge of standard twist drill, grinding requirements basically back down to the standard twist drill blade: BR 2 + 2ordm angle is 118 degrees; after the angle BR the hole at the edge of 0 to 10 DEG -14 DEG BR and the rake angle is 50 the two DEG -55 DEG BR cut main cutting edge length and composition of drill axis angle of the two to the two main BR equal to the flank grinding smooth. BR but its not enough to have a theory. Make sure the students stand in front of the grinding machine. They are automatic hands, and they dont blindly grind. If you are not the hand to guide students grinding methods and skills, then the theory of good knowledge of students, you let him first sharpening a standard twist drill, nine out of ten is not drilling. Why? Theory has not yet acted as a guide to practice. Students have not mastered the skills and skills of sharpening. The common standard twist drills only grind two main flank and regrinding edges, but after sharpening, we should ensure that the top angle, the transverse edge angle and the two main cutting lengths are equal, or so high. Moreover, after sharpening the grinding edge, it is difficult for the drill to be smooth in cutting and to chip out in the drilling process. First of all, to help students build confidence, confidence and motivation. After mastering the methods and techniques, sharpening a qualified standard twist d