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Adjustable finishing broach of wheel disc and tenon slot combination surface

A combined and fine broaching technology, which is applied in the direction of broaching tools, broaching machines, metal processing equipment, etc., can solve the problems of not having the function of adjusting side profile lines and reducing the geometric accuracy of side profile lines, so as to reduce the first-time manufacturing accuracy Requirements, overcoming the non-adjustable height, maintaining and improving the effect

Inactive Publication Date: 2012-10-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Both of the above two documents involve the fir tree-shaped tongue and groove broaches of turbine discs, but their structures do not have the function of adjusting the direction of the profile line of the side profile. None of the patents are for broaching finishing of heavy duty gas turbine discs

Method used

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  • Adjustable finishing broach of wheel disc and tenon slot combination surface
  • Adjustable finishing broach of wheel disc and tenon slot combination surface
  • Adjustable finishing broach of wheel disc and tenon slot combination surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment selects the rake angle 8 of 20° to ensure the surface roughness during fine broaching; selects the relief angle 9 of 3° to reduce the flank wear of the tool flank due to the springback deformation of the material, and Reserve a certain allowance for regrinding; the tooth thickness 10 of the cutting part is selected as 8 mm, and the tooth spacing 11 is 31 mm to ensure that the cutting edge has sufficient strength; the radius of the chip flute 12 is selected as R2.5 mm to It is used for thin-layer cutting chips during fine drawing.

Embodiment 2

[0031] The rake angle 8 is 15°, the rear angle 9 is 5°, the tooth thickness 10 is 6 mm, the tooth spacing 11 is 20 mm, and the radius 12 of the chip flute is R5 mm.

Embodiment 3

[0033] The rake angle 8 is 25°, the rear angle 9 is 2°, the tooth thickness 10 is 9 mm, the tooth spacing 11 is 32 mm, and the chip flute radius 12 is R3.5 mm.

[0034] When the present invention is working, the profile combined and separated adjustable structure is used to maintain the geometric accuracy of the side profile line after regrinding of the tool, so as to meet the strict requirements of the tenon and groove processing of the heavy-duty gas turbine rotor disk.

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Abstract

The invention discloses an adjustable finishing broach of wheel disc and tenon slot combination surface. The adjustable finishing broach comprises a mounting section, a cutting section and an adjusting section, wherein the cutting section consists of two halves of separate contour line blade elements and fixed on the mounting section through the adjusting section, and the adjusting section is a replaceable element to adjust the position of the contour line of the cutting section. According to the invention, the dimensional deviation of reground cutting edge can be removed; the geometric accuracy of precisely processed contour line is kept; the tool cost is reduced, and the service life of the tool is prolonged; and the adjustable finishing broach is suitable for broaching machining of the wheel disc and the tenon slot of a heavy gas turbine rotor.

Description

technical field [0001] The invention relates to a cutting tool, in particular to a combined profile-adjustable finish broach used in the finish broaching stage of the tenon and groove processing of the heavy-duty gas turbine rotor disk, and belongs to the technical field of mechanical manufacturing. Background technique [0002] The temperature of the working environment of the gas turbine rotor is extremely high, and the rotor is subjected to high-speed rotating centrifugal force and additional stress during operation. Therefore, the precision requirements for the fir tree-shaped tenon and groove connecting the disc and the blade on the compressor section and the turbine section of the rotor are very strict. Improve the fatigue resistance of the rotor. The production of heavy-duty gas turbines (the general name for 200MW-class gas turbines) has higher and higher requirements for efficiency. The traditional forming and milling methods can no longer meet the requirements. The...

Claims

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Application Information

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IPC IPC(8): B23D43/00
Inventor 安庆龙陈明刘志强邱坤贤王呈栋
Owner SHANGHAI JIAO TONG UNIV
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