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.