Rough Machining Method of Turbine Blade Damping Boss

Abstract

The invention discloses a method for rough machining of a damping boss of a turbine blade, which comprises the following steps: (1) selecting a cutting tool whose radius difference between a cutter head and a cutter bar is greater than or equal to the depth of the undercut surface of the damping boss to be processed; 2) Generate the NC machining program of the damping boss according to the characteristics of the damping boss and the selected tool features. By controlling the attitude of the tool, let the rounded corners of the tool process the steep curved surface of the damping boss and the damping boss and The transition position at the root of the blade profile, the small position of the cutter bar of the cutter leaves the interference part of the negative surface of the damping boss. It uses one tool to complete the rough machining of the surface of the damping boss and the transfer of the lower part of the damping boss, leaving a uniform allowance for finishing and improving the processing quality; no need to change the tool, the invalid cutting time (except for entering and retreating) is short, and no Supplementary processing is required; the load of the machine tool is uniform, the cutting process is smooth, the processing efficiency is greatly improved, and the difficulties and bottlenecks of boss processing are effectively overcome.

Description

technical field [0001] The invention relates to the field of turbine blade processing, in particular to a rough machining method for a damping boss of a turbine blade. technical background [0002] The damping boss of the turbine blade is a space convex curved surface on the inner back arc surface at the proper position of the steam channel height of the turbine blade, and the turbine blade profile is a complex curved and twisted space surface. In order to improve the shock absorption characteristics and enhance the working strength, the large blades are generally of a structure with a damping boss. [0003] The machining of turbine blade damping boss has always been the difficulty and bottleneck of blade machining. When CNC machining blades, the 3+2 method is usually used for rough machining. With the optimization of the design, the parameters of the turbine unit are getting higher and higher, and the damping boss becomes more and more complex, generally a complex space s...

AI Technical Summary

Problems solved by technology

In order to process all the damping bosses, the traditional method needs to be carried out from several different angles. Because of the problem of empty knife and knife connection, the processing efficiency is very low, and the area between the blade profile and the damping boss is unavoidable. There is full cutting, resulting in large cutting force, large tool consumption, resulting in deformation of the blade, and cannot leave a uniform margin for finishing

Images