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Forming grinding method of turbine long shaft spline teeth

A technology of forming grinding and spline teeth, which is applied in the direction of gear teeth, grinding machine parts, grinding/polishing equipment, etc. Effect of Surface Roughness

Active Publication Date: 2019-09-03
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the further improvement of the precision and surface roughness of the involute spline teeth of the turbine long-axis parts by more advanced aero-engines (tooth shape accuracy ≤ 0.01mm, tooth direction accuracy ≤ 0.008mm, surface roughness Ra ≤ 0.8), Gear hobbing has been difficult to meet the requirements of various high-precision indicators proposed in the design of new-type turbine long-axis spline gear machining

Method used

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  • Forming grinding method of turbine long shaft spline teeth
  • Forming grinding method of turbine long shaft spline teeth
  • Forming grinding method of turbine long shaft spline teeth

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Embodiment

[0033] Example: Form grinding of involute spline straight teeth of turbine long axis parts of an aero-engine

[0034] The long shaft part of the engine turbine is made of high-temperature alloy GH4169, which is a difficult-to-machine material. Such asfigure 1 , the axial length of the straight involute spline tooth to be processed is 100mm; the machining allowance on one side of a single involute spline tooth is 3.5mm (that is, the radius difference between the tooth top and the tooth root); the number of teeth is 41 1; Tooth profile accuracy ≤ 0.01mm, tooth direction accuracy ≤ 0.008mm, tooth surface roughness Ra ≤ 0.8.

[0035] Based on the above description of the straight spline teeth of the parts, the spline teeth are processed according to the following steps. Including: the selection of grinding wheel materials and abrasives, the dressing method and dressing parameters of the grinding wheel, the processing stage and allowance distribution of the spline teeth of the par...

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Abstract

The invention discloses a forming grinding method of turbine long shaft spline teeth. Firstly, the molded surface of a grinding wheel is directly finished into the shape correspondingly opposite to the tooth shapes of involute spline straight teeth on a turbine long shaft part, and the machining allowances of the involute spline straight tooth portions are pre-machined on the turbine long shaft part for layering; and then the grinding wheel with the finished molded surface is adopted for directly carrying out forming grinding on all layers until the spline teeth meeting the design requirementsare finally formed. The machining precision and the surface roughness of the part spline teeth can be greatly improved, and the requirements of high-precision machining and high surface roughness ofthe high-temperature alloy turbine long shaft part of an advanced aeroengine on the shapes, the directions and the like of the involute spline teeth are met.

Description

technical field [0001] The invention belongs to the field of mechanical processing, and in particular relates to a method for forming and grinding the involute spline teeth of a long-axis part of a turbine made of a high-temperature alloy material. Background technique [0002] For the machining of the involute spline straight teeth of the long shaft parts of the turbine whose material is a superalloy, the method of generating hobbing is usually carried out on a gear hobbing machine. However, the spline teeth processed by this method can only control the tooth shape and tooth direction accuracy to ≥0.02mm, and the surface roughness can only meet the requirements of Ra=1.2~1.6. However, with the further improvement of the precision and surface roughness of the involute spline teeth of the turbine long-axis parts by more advanced aero-engines (tooth shape accuracy ≤ 0.01mm, tooth direction accuracy ≤ 0.008mm, surface roughness Ra ≤ 0.8), Gear hobbing has been difficult to mee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B24B53/075B23F5/02
CPCB23F5/02B24B53/075
Inventor 李林燊刘丽娟付蓉何坚余杰陈燕
Owner AECC AVIATION POWER CO LTD
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