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A Control Method for Grinding Cracks of Aeroengine Carburized Gears

A technology for aero-engine and carburizing gears, which is applied in the control field of grinding cracks in aero-engine carburizing gears, can solve problems such as high cost, long manufacturing cycle, and impact on product quality, etc.

Active Publication Date: 2016-08-03
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for controlling the grinding cracks of carburized gears of aero-engines, which overcomes the shortcomings of the prior art that the grinding cracks cannot be effectively controlled, affects product quality, and makes the product manufacturing cycle long and high in cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for controlling the grinding cracks of the aero-engine carburized gear in this embodiment specifically includes the following steps:

[0018] Step 1: Carry out primary and secondary carburizing treatment on the gear to ensure that the microhardness of the surface of the gear to be ground is 56-60HRC. In this embodiment, the test equipment for the primary and secondary carburizing treatment is a vacuum carburizing furnace ICBP-644TH. Equipment parameters: effective heating area 600mm×450mm×450mm, furnace temperature uniformity (500~750)℃ / ±5℃, (750~1150)℃ / ±10℃;

[0019] In this embodiment, the process of carrying out primary and secondary carburizing treatment to gears includes the following sub-steps:

[0020] Sub-step 1: set the carbon potential of the vacuum carburizing furnace to 1.1%;

[0021] Sub-step 2: Set the primary carburizing temperature and holding time to 905°C and 6.5H respectively;

[0022] Sub-step 3: set the secondary carburizing temperature...

Embodiment 2

[0028] The method for controlling the grinding cracks of the aero-engine carburized gear in this embodiment specifically includes the following steps:

[0029] Step 1: Perform primary and secondary carburizing treatment on the gear to ensure that the microhardness of the gear surface to be ground is 56-60HRC; in this embodiment, the process of performing primary and secondary carburizing treatment on the gear includes the following sub-steps:

[0030] Sub-step 1: set the carbon potential of the vacuum carburizing furnace to 1.3%;

[0031] Sub-step 2: Set the primary carburizing temperature and holding time to 905°C and 6.5H respectively;

[0032] Sub-step 3: set the secondary carburizing temperature and holding time to 905°C and 4H respectively;

[0033] After coming out of the oven, check the microhardness of the gear surface to be ground. The three test values ​​are: 57, 61, 62, and the average value is 60;

[0034] Step 2: Grinding the carburized gear;

[0035] Step 3: P...

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PUM

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Abstract

The invention relates to a method for controlling grinding cracks of a carburized gear of an aircraft engine. The method mainly comprises two aspects: 1, in consideration of the condition that a surface-layer metallographic structure is inevitably changed by excessively high surface temperature to further cause changes in the microscopic hardness of the surface of the gear during the grinding of the gear, the microscopic hardness of the surface to be ground of the gear is controlled to be 56 to 60HRC; 2, the grinding cracks are resulted from the superimposition of structural stress and thermal stress, so that the distribution condition of surface stress is improved to balance or reduce residual stress. The method has the beneficial effects that a lot of experiments show that the grinding cracks in the ground surface of the gear are eliminated; the method can be popularized and applied to control over the grinding cracks of gears of aircraft engines of other types, and valuable technical experiences are accumulated for researches on aircraft engines of new types.

Description

technical field [0001] The invention relates to a method for controlling grinding cracks of an aero-engine carburized gear. Background technique [0002] Aeroengine gears are used to transmit power and change operating speed, so various forms of gears are widely used in power transmission mechanisms such as reducers. [0003] During the engineering manufacturing process of aero-engine gears, grinding cracks are an important factor affecting product quality. Grinding cracks are divided into two types, one is that it only occurs on the grinding surface, the depth is relatively shallow, and the depth is basically the same, the direction is perpendicular to the tooth direction, and there is no definite shape, and the other is that the crack is tortoiseshell (closed network Shape), the depth is roughly 0.03 ~ 0.15mm. The biggest feature of grinding cracks is that they cannot appear immediately and have a great delay. The existence of grinding cracks will greatly reduce the fati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/14
CPCB23P6/04
Inventor 王福平王军郭子静梁养民杨桢郝芝戴静茹陈文亮
Owner AECC AVIATION POWER CO LTD