Method for machining tongues and grooves of turbine discs

Abstract

The invention discloses a method for machining tongues and grooves of turbine discs. The method includes steps of 1), forming section grooves in turbine disc blanks along reference lines of tooth crests of tongue teeth in rough broaching stroke; 2), cutting preset tongue tooth groove locations on the side walls of the section grooves to form tongue tooth rough grooves in semi-finish broaching stroke; 3), continuing to carry out cutting on the basis of the tongue tooth rough grooves to obtain tongue tooth grooves. The method for machining the tongues and grooves of the turbine discs has the advantages that the semi-finish broaching stroke is added between the rough broaching stroke and the finish broaching stroke, the partial tongue tooth rough grooves in allowance stroke can be removed bythe aid of the semi-finish broaching stroke, then the remaining tongue tooth grooves in the allowance stroke can be removed by the aid of the finish broaching stroke, finish broaching tools and semi-finish broaching tools are jointly responsible for tongue tooth groove allowance cutting, accordingly, allowance required to be cut by the various broaching tools can be reduced, broaching force in broaching procedures can be reduced, tool damage phenomena can be prevented, and the purposes of protecting the broaching tools, prolonging the service lives of the broaching tools and improving the component machining quality can be achieved.

Description

technical field [0001] The invention relates to the technical field of machining, in particular to a method for machining a tenon and groove of a turbine disc. Background technique [0002] The tenon and groove of the turbine disc are broached sequentially by multiple broaches. [0003] Such as figure 1 As shown, the existing tongue and groove broaching scheme uses a total of 10 broaches, which are processed sequentially in I and II strokes. Among them, the 01-06 broaches are mainly used to remove the allowance, which belongs to the rough drawing stroke of the I stroke ; The 07th-010th broaches are mainly used to process the final profile of the tenon and groove, which belong to the finishing stroke. Thick, the broaching force is large during the broaching process, and it is easy to hit the knife, which affects the life of the broach and the quality of the part. [0004] Therefore, how to provide a new turbine disk tenon and groove machining scheme to avoid the occurrence...

AI Technical Summary

Problems solved by technology

[0003] like figure 1 As shown, the existing tongue and groove broaching scheme uses a total of 10 broaches, which are processed sequentially in I and II strokes. Among them, the 01-06 broaches are mainly used to remove the allowance, which belongs to the rough drawing stroke of the I stroke ; The 07th-010th broaches are mainly used to process the final profile of the tenon and groove, which belong to the finishing stroke. Thick, the broaching force is relatively large during the broaching process, and it is easy to break the knife, which affects the life of the broach and the quality of the part

Images