Method for machining balance hole of steam turbine rotor disc and machining tool

Abstract

The invention provides a turbine rotor disk balance hole machining method and a machining tool. The machining method includes the following steps that, step 10, a workbench is arranged, wherein a pit is formed, the workbench is fixed to the bottom of the pit, a pressing plate is fixedly arranged on the workbench, a rotor workpiece is vertically placed on the workbench and pressed through the pressing plate, a through hole is formed in the center of the workbench, the lower portion of the workbench is aligned with the through hole to be provided with a steel pipe so that a round pit can be formed, and one end of each rotor stretches into the round pit; step 20, balance holes are machined, wherein a radial drill is installed on one side of the pit, a balance hole drill jig is installed in the to-be-machined balance hole of the first to-be-machined rotor, the radial drill is used to control a drill bit to start machining of the balance holes of the rotors according to guiding of the balance hole drill jig till machining of the balance holes of the to-be-machined rotors covered in the stroke of the drill bit is completed. According to the turbine rotor disk balance hole machining method, a vertical machining method is adopted, the workpiece is vertically machined, the radial drill is selected for machining, and machining cost is low.

Description

technical field [0001] The invention relates to the technical field of steam turbine rotor impeller processing, in particular to a method for machining a balance hole of a steam turbine rotor disc, and also provides a processing tool used in the method for machining a balance hole of a steam turbine rotor disc. Background technique [0002] The steam turbine rotor is the core component of the steam turbine and requires high machining accuracy. In steam turbine rotor processing technology, in order to balance the thrust of the end face of the impeller, there are usually steam balance holes on the impeller. The conventional processing method of the steam balance hole is to process the steam balance hole on a boring machine; Lying on the machine table, for a relatively long rotor, the table of the floor boring machine is not long enough to effectively clamp the workpiece. And those with flanges on the end face of the rotor cannot be finished on the boring machine, so the turni...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems existing in the prior art that the roundness of the balance hole cannot be guaranteed to meet the requirements, and that the machining of the balance hole has a high failure rate and a low success rate, the present invention provides a method for machining the balance hole of a steam turbine rotor disk and Processing tool

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