Complicated groove type milling cutter and method for machining chip breaker grooves of complicated groove type milling cutter

Abstract

The invention discloses a complicated groove type milling cutter and a method for machining chip breaker grooves of the complicated groove type milling cutter. The molded line of an cutting edge of the milling cutter is in the shape of a Christmas tree, the milling cutter is provided with three or four teeth, the front angle of the milling cutter is 10 degrees, the helical angle of the milling cutter ranges from 3 degrees to 10 degrees, a chip breaker groove is formed in the back of the blade of the cutter and located on each tooth, the shape of each chip breaker groove is the same as the shape of the molded line of the cutting edge, the molded lines of the chip breaker grooves are corrugated, the chip breaker grooves of the teeth are sequentially staggered by certain wavelengths/teeth in the spiral direction of the milling cutter, the molded lines of the chip breaker grooves meet the relation R>r and the relation R=X2/(8Z)+Z/2-r, X refers to the wavelength, Z refers to the wave depth, R refers to the circular arc radius of upper half waves, and r refers to the circular arc radius of lower half waves. The method for machining the chip breaker grooves comprises the steps that the molded lines of the chip breaker grooves of the milling cutter are drawn by means of autocad drawing tool software and are guided into the num software of a numerically-controlled machine tool control system, a chip breaker groove machining program is generated automatically, and the chip breaker grooves of the milling cutter are machined automatically through a machine tool.

Description

technical field [0001] The invention relates to the processing technology of metal cutting tools, in particular to a complex groove type milling cutter and a processing method of chip breaker grooves thereof. Background technique [0002] The Christmas tree (i.e. fir tree)-shaped wheel groove on the moving blade assembly wheel of the steam turbine rotor has extremely complicated lines and requires high machining accuracy, with many technical difficulties and great difficulties. In order to achieve high speed, large depth of cut, and fast tool feed in machining operations, the cutting tool used is a semi-finishing milling cutter with a three-dimensional complex groove shape and a wave-shaped wheel groove. The complex groove type milling cutter has a rake angle of 10° and a helix angle of 3-10°. On the back of each tooth of the milling cutter, there is a chip breaker that is consistent with the trajectory of the cutting edge line. These chip breakers are in the form of Corrug...

AI Technical Summary

Problems solved by technology

The corrugation density and the flatness of the upper half wave are a pair of contradictions, and it is not easy to take into account

In the past, the shape of the chip breaker was a sine wave, and the radius of the upper and lower half waves was the same, which failed to solve this contradiction, so that the above advantages of the milling cutter have not been fully utilized, and further improvement is required

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