Cemented carbide profile milling cutter with large helix angle

Abstract

The invention relates to a cemented carbide profile milling cutter for machining a rotor mortise and a blade tenon of a turbine, a blower and the like, comprising a blade and a handle of an integral structure, wherein the blade has a fir-tree or mushroom contour shape; a helix angle Beta is 15-25 degrees; a front angle Gamma of the cutter increases from 8 degrees to 15 degrees along with the increment of the diameter of the profile; a back angle Alpha of the cutter increases from 6 degrees to 12 degrees along with the increment of the diameter of the profile; a back margin of the cutter is 3-4mm in width, and is 1-2mm in depth; an unequal degree of the chip removal groove is 3-8 degrees. The milling cutter has high hardness, good wearing resistance, long service life, rational structure, low work resistance and vibration, and is suitable for high-speed cutting.

Description

technical field [0001] The invention relates to a milling cutter, in particular to a profile milling cutter used for processing rotor tenon grooves and blade tenon teeth of machines such as steam turbines and blowers. Background technique [0002] The blade tenons and rotor tenons of steam turbines, aircraft engines and blowers are all processed by profile milling cutters. There are two problems with the existing milling cutters. One is that the materials are all made of high-speed steel, which has limited hardness and poor wear resistance. The cutting edge is easy to wear, and the linear speed does not exceed 45 m / min, which cannot meet the high-speed cutting requirements. The second is that the design of the tool structure is not reasonable. The chip removal groove adopts a straight groove or a small helix angle of about 5 degrees. The positive rake angle of the tool is also small, and the chip removal is not smooth during the cutting process of the tool. The roughness of...

AI Technical Summary

Problems solved by technology

[0002] The blade tenons and rotor tenons of steam turbines, aircraft engines and blowers are all processed by profile milling cutters. There are two problems with the existing milling cutters. One is that the materials are all made of high-speed steel, which has limited hardness and poor wear resistance. The cutting edge is easy to wear, and the linear speed does not exceed 45 m / min, which cannot meet the high-speed cutting requirements

The second is that the design of the tool structure is not reasonable. The chip removal groove adopts a straight groove or a small helix angle of about 5 degrees. The positive rake angle of the tool is also small, and the chip removal is not smooth during the cutting process of the tool. The roughness of the machined surface is poor; the tool durability is low, and the cutting length generally does not exceed 5 meters

This leads to low cutting efficiency and high tool consumption

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