Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud

A technology of combining electrodes and processing methods, applied in the field of aerospace or aviation special processing, can solve the problems of long effective processing time of equipment and low EDM processing efficiency, so as to increase the machining discharge area, improve the EDM efficiency of turbine disks, The effect of improving the utilization rate of machine tools

Active Publication Date: 2014-08-20
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a combined electrode machining method for improving the EDM efficiency of turbine discs with shrouds, which can solve the problems of low EDM processing efficiency of integral turbine disc blades with shrouds, long effective processing time of equipment occupied by non-productive work, etc. question

Method used

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  • Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud
  • Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud
  • Compound electrode machining method for improving efficiency of electric spark machining of turbine disc with blade tip shroud

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Experimental program
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Effect test

Embodiment 1

[0031] Such as figure 1 As shown, 21 blades are evenly distributed on the diameter of the turbine disk with blade shroud Φ220mm, and the inlet and outlet are at an angle of 10 degrees relative to the axis. The blades are not only slender but also have a large grid pitch. According to calculations, the total length of a single blade is about 61 mm, the center of gravity is located at the center of the trailing edge of the blade, most of the blades deviate from the centerline of the impeller, and the blade spans the circumference of 17.14°. This structure puts forward higher requirements for electrode design.

[0032] A combined electrode machining method for improving the EDM efficiency of a turbine disk with a shroud according to the present invention is adopted, and the blade channel includes an inlet area 3, a channel throat area 2, and an outlet area 4;

[0033] It includes the following steps:

[0034] (a) Rough machining blade channel

[0035] Such as Figure 5 As show...

Embodiment 2

[0057] A combined electrode machining method for improving the EDM efficiency of a turbine disk with a shroud according to the present invention is adopted, and the blade channel includes an inlet area 3, a channel throat area 2, and an outlet area 4;

[0058] It includes the following steps:

[0059] (a) Rough machining blade channel

[0060] Such as Figure 6 As shown, use the combined electrode on the left and the combined electrode on the right to machine the entrance area 3 and the exit area 4 from the left and right sides of the turbine disk respectively; quantity;

[0061] The left combined electrode combines four electrodes together through the connecting block to form the left combined electrode, and the assembly position of the electrode and the connecting block corresponds to the position and angle of the blade channel of the corresponding turbine disk; the design of the left combined electrode adopts Based on the profiling design principle of the blade channel o...

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Abstract

The invention provides a compound electrode machining method for improving the efficiency of electric spark machining of a turbine disc with a blade tip shroud. The method comprises the following steps: (a) rough machining of a blade channel, wherein an inlet area and an outlet area are machined from the left side and the right side of the turbine disc respectively in an electric spark machining mode through a left compound electrode and a right compound electrode till one-third machining allowance of the inlet area and one-third machining allowance of the outlet area are left; (b) semi-finish machining of the blade channel, wherein a channel laryngeal area is machined from the left side and the right side of the turbine disc in an electric spark semi-finish machining mode through a single left semi-finish machining electrode and a single right semi-finish machining electrode and are made in a through state; (c) finish machining of the blade channel, wherein the blade channel is machined in place from the left side and the right side of the turbine disc in an electric spark finish machining mode through a single left finish machining electrode and a single right finish machining electrode. According to the method, the electrodes can be quickly clamped and replaced, the auxiliary time is shortened, the machine tool utilization rate is increased, and secondary alignment is not needed during replacement.

Description

technical field [0001] The invention belongs to the technical field of aerospace or aviation special processing, and in particular relates to a combined electrode processing method for improving the electric discharge processing efficiency of a turbine disk with a shroud. Background technique [0002] The integral turbine disk is the core component of aviation and aerospace engines. It operates under high temperature and high speed conditions, and bears strong thermal erosion and vibration loads. Its working condition is very bad. The advanced design and structure of the turbine disk directly affects the engine. The pros and cons of performance, the level of reliability. Therefore, the integral turbine disk processing technology has always been one of the core key manufacturing technologies of aerospace engines. Integral turbine disks can be divided into two types: open without shrouds and semi-closed with shrouds. Among them, semi-closed integral turbine disks with shrouds...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23H5/02
Inventor 陈济轮钟晓红张昆马宁孙秀京张万刚沈岩朱平萍
Owner CAPITAL AEROSPACE MACHINERY
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