Stream turbine rotor blade root arc groove roughing milling cutter

Abstract

The invention relates to a stream turbine rotor blade root arc groove roughing milling cutter comprising a cylindrical cutter body, wherein the upper end face of the cutter body in the same circumference is provided a plurality of blade bearings at intervals on which end face cutting blades are arranged; one of the end face cutting blades of any two adjacent blade bearings is arranged on the outer side face of the blade bearing fixed with the end face cutting blade, and the other one of the end face cutting blades is arranged on the inner side face of the blade bearing fixed with the end face cutting blade; the outer periphery and the inner periphery of the cuter body are provided with a plurality with steps symmetrically from top to bottom, wherein the radius of the steps on the outer periphery from top to bottom increases by effect, the periphery of the steps on the inner periphery and the outer periphery is provided with a plurality of cuttings chutes which are sunken towards the wall surface of the cutter body, and the root parts of the cuttings chutes are provided with a tool apron on which a step cutting blade is arranged. The invention has the advantage of high processing efficiency and long service life.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a rough milling cutter for a blade root arc groove of a steam turbine rotor. Background technique [0002] In the steam turbine manufacturing industry, the steam turbine rotor blade root groove (refer to Figure 8 ) processing is a very important and complicated process. In recent years, industrialized countries such as Japan and the United States have successively developed Christmas tree-shaped root groove milling cutters and used them in production, but the import price is very expensive. There are also several domestic companies that have developed Christmas tree-shaped blade root slot milling cutters and have put them into use. However, due to the large amount of machining of the blade root groove, the contact area between the tool and the surface of the machined part is relatively large, resulting in a large cutting resistance, and more chips are formed, whic...

AI Technical Summary

Problems solved by technology

However, due to the large amount of machining of the blade root groove, the contact area between the tool and the surface of the machined part is relatively large, resulting in a large cutting resistance, and more chips are formed, which is difficult to discharge, forcing the cutting speed to slow down, affecting Processing efficiency, tool consumption is also very large, so that the life of the tool is shortened

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