An Optimal Method for Efficient and Stable Broaching of Turbine Disc Tenon Groove

Abstract

The invention discloses an optimization method for efficient and stable broaching machining of a turbine disc mortise. The optimization method comprises the following steps that a series of points areevenly arranged on the contact trace of a workpiece and a tool at intervals according to the broaching machining path, and modal transfer functions for the tool and the workpiece at all nodes are sequentially obtained through a modal test; transfer functions phi<1i> between the workpiece and the tool at the different nodes are built according to the modal transfer functions of the tool at the nodes and the modal transfer functions of the workpiece at the nodes, and transfer functions phi<1i> (s) in a Laplace mode are obtained from phi<1i> through Laplace transformation; stable areas in cutting machining of the workpiece at the different nodes are obtained according to phi<1i> (s) and the method of solving the stable areas through frequency domains; and the workpiece is efficiently and stably machined according to cutting parameters of the stable areas. According to the method, stable and efficient machining can be conducted by selecting the corresponding cutting parameters according to the different nodes, the condition that tool tipping is generated due to tool trembling is avoided, the life of the tool is prolonged, and the workpiece surface quality is improved.

Description

technical field [0001] The invention relates to the field of mechanical processing, in particular to an optimization method for efficiently and stably broaching a tenon and groove of a turbine disk. Background technique [0002] At present, as a special and effective processing method, broaching has advantages that other processing methods cannot match in processing parts with many specific structures, such as high processing efficiency and high processing accuracy. Nickel-based alloy is used as a general-purpose turbine disk tongue and groove material. During its processing, due to the characteristics of nickel-based alloys, the cutting process has the characteristics of difficult chip breakage, large cutting force, and short tool life. Additional broaching Due to the long broach during processing and the limited installation rigidity of the broaching workpiece, the vibration between the tool and the workpiece is more likely to occur during processing, resulting in large pr...

AI Technical Summary

Problems solved by technology

Nickel-based alloy is used as a general-purpose turbine disk tongue and groove material. During its processing, due to the characteristics of nickel-based alloys, the cutting process has the characteristics of difficult chip breakage, large cutting force, and short tool life. Additional broaching Due to the long broach during processing and the limited installation rigidity of the broaching workpiece, the vibration between the tool and the workpiece is more likely to occur during processing, resulting in large processing errors, shortened tool life, and low processing efficiency. , In addition, during the broaching process, the contact position between the tool and the workpiece changes, and its contact point also changes in the response of the part, that is, its dynamic characteristics change, resulting in a change in the stable area of ​​​​the cutting process

If the cutting speed is not changed in time or the cutting depth is not suitable, it is easy to cause tool chatter, resulting in tool chipping and reduced surface quality of the workpiece.

Images