Efficient grinding method for tipping tooth tops of side-edge-free roughing broaches

Abstract

The invention discloses an efficient grinding method for tipping tooth tops of side-edge-free roughing broaches. The efficient grinding method is characterized in that a magnetic workbench is deflected by a certain angle to grind triangular areas of tips of tipping teeth of a broach, follow-up teeth are ground according to shapes of the ground tipping teeth, the grinding allowance of the follow-up teeth is gradually reduced, the last three follow-up teeth of the broach are kept unground to guarantee the profile of the broach, accordingly, local envelope curves of the ground teeth of the broach are changed, and the tipping teeth of the side-edge-free roughing broach are efficiently ground. The efficient grinding method has the advantages that the profile of the original integral envelope curve of the broach is guaranteed, the grinding allowance is low, a blade of the broach is ground uniformly, the grinding time is greatly shortened, impact and vibration on the front-back teeth adjacent to the tipping teeth can be effectively reduced, the grinding efficiency is improved, grinding permissible times of the broach are increased, the service life of the broach is prolonged, the production cost is lowered, and the efficient grinding method is suitable for broaches with various structures and is particularly suitable for grinding side-edge-free roughing broaches for machining mortises of rotor discs of heavy-duty gas turbines.

Description

technical field [0001] The invention relates to a grinding method for a metal cutting tool, in particular to a high-efficiency grinding method for tooth tip chipping of a rough broach without a side edge, and belongs to the technical field of mechanical cutting processing and manufacturing. Background technique [0002] As the most advanced and complex mechanical manufacturing technology in the world, heavy-duty gas turbine manufacturing technology has become an important symbol to measure the manufacturing capacity of my country's energy industry. The working temperature of gas turbine rotor is high, the volume of rotor forging is large, and it needs to bear large centrifugal force and additional stress when rotating at high speed. This requires the rotor material to have good high temperature tensile strength, good plasticity, high creep strength, and low The ductile-brittle transition temperature and other properties. Therefore, the material of the rotor disk is a diffic...

AI Technical Summary

Problems solved by technology

There are two traditional broach grinding methods: one is the grinding method of the rake face of the cutting edge; the other is the grinding method of completely grinding off the chipped teeth, and the follow-up teeth are evenly distributed by the tooth lift of the chipped teeth; however, this The two grinding methods have a large loss on the tool, which reduces the number of times the tool can be reground, reduces the service life, and causes the cost of the tool to rise sharply

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