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Thermal treatment method for improving low-temperature impact work of air blower main shaft

A heat treatment method and low-temperature impact technology, applied in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of low pass rate of heat treatment, high production cost, and inability to guarantee normal production of products, etc.

Inactive Publication Date: 2013-06-26
ZHONGYUAN SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat treatment qualification rate of the product is lower than 30%
Caused a huge production cost, unable to guarantee the normal production of the product

Method used

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  • Thermal treatment method for improving low-temperature impact work of air blower main shaft
  • Thermal treatment method for improving low-temperature impact work of air blower main shaft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] A heat treatment method for improving the low-temperature impact energy of the fan shaft. Six fan shafts made of 42CrMoA are selected, and the furnace is installed at a quenching temperature of 840°C. The heating is at an average temperature of 6-7 hours, and the furnace is released after 6-8 hours of heat preservation. The furnace temperature is 840°C. , air-cooled for 5-8 minutes and then placed in the quenching station, then sprayed with water and cooled for 2-5 minutes, then air-cooled for 1-2 minutes, then water-filled and sprayed for 10-20 minutes, then air-cooled for 2-4 minutes and then cooled by water or spraying 1 to 3 minutes, press this and repeat 3 times; after cooling, the outlet water temperature of the workpiece is controlled at 140°C, after quenching, it is tempered at a temperature of 590°C, and the tempering is kept for 25 to 30 hours; after tempering, air cooling and water cooling are alternated for 10 to 20 minutes Then air cool to room temperature. ...

Embodiment 2

[0011] A heat treatment method for improving the low-temperature impact energy of the fan shaft. Six fan shafts made of 42CrMoA are selected, and the furnace is installed at a quenching temperature of 840°C. The heating is at an average temperature of 6-7h, and the furnace is released after 6-8h of heat preservation. The furnace temperature is 860°C. ℃, air-cooled for 5-8 minutes, then placed in the quenching station, then sprayed with water to cool for 2-5 minutes, then air-cooled for 1-2 minutes, then injected with water for 10-20 minutes, then air-cooled for 2-4 minutes and then soaked in water or sprayed Cool for 1 to 3 minutes, repeat this step 4 times; after cooling, the outlet water temperature of the workpiece is controlled at 160°C, after quenching, temper at 630°C, and keep tempered for 25 to 30 hours; after tempering, air cooling and water cooling are alternated for 10 to Cool to room temperature in air after 20 min.

Embodiment 3

[0013] A heat treatment method for improving the low-temperature impact energy of the fan shaft. Six fan shafts made of 42CrMoA are selected, and the furnace is installed at a quenching temperature of 860°C. The heating is at an average temperature of 6-7 hours, and the furnace is released after 6-8 hours of heat preservation. The furnace temperature is 860°C. , air-cooled for 5-8 minutes and then placed in the quenching station, then sprayed with water and cooled for 2-5 minutes, then air-cooled for 1-2 minutes, then water-filled and sprayed for 10-20 minutes, then air-cooled for 2-4 minutes and then cooled by water or spraying 1~3min, press this and repeat 6 times; after cooling, the outlet water temperature of the workpiece is controlled at 160°C, after quenching, it is tempered at 630°C, and the tempering is kept for 25~30h; after tempering, air cooling and water cooling are alternated for 10~20min Then air cool to room temperature.

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Abstract

The invention belongs to the technical field of production of air blower main shafts and in particular relates to a thermal treatment method for greatly improving a low-temperature impact toughness value in the mechanical performances of an air blower main shaft material. The thermal treatment method comprises the following steps of: selecting the air blower main shaft made of a 42CrMoA material, feeding the air blower main shaft to a furnace under a quenching temperature of 840 DEG C to 860 DEG C; heating up and equalizing the temperature, discharging the air blower main shaft out of the furnace after keeping the temperature, wherein the tapping temperature is 840 DEG to 860 DEG C; cooling in the air and placing the cooled air blower main shaft in a quenching station; injecting water for immersing and cooling; re-injecting water for immersing and cooling after cooling in the air; soaking in water or spraying for cooling after cooling in the air, repeating the process for 3 times to 6 times; controlling the outlet water temperature of the workpiece after the cooling to 140 DEG C to 160 DEG C; tempering at 590 DEG C to 630 DEG C after the quenching is finished for preserving the heat; cooling in the air to reach the room temperature after carrying out air-cooling and water-cooling alternatively upon tempering and discharging from the furnace, wherein the impact work value at -30 DEG C can be greatly improved relative to the conventional thermal treatment process.

Description

technical field [0001] The invention belongs to the technical field of fan main shaft production, and in particular relates to a heat treatment method capable of greatly improving the low-temperature impact toughness value of the mechanical properties of the fan main shaft material. Background technique [0002] Under the background of vigorously promoting new energy sources in the country, wind power generation has become the focus of public attention. As an important part of wind turbines, fan shafts are also being sought after by major manufacturers. As a member of Bingzhuang Group, our company actively responds to the government's call to enter the field of fan spindle processing. In production, we found that some fan shaft products have very high requirements on the performance of materials, and the wind power machine manufacturers who need these products are often some large multinational companies. [0003] In order to open up the market for the main shaft of the fa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/28
Inventor 张歧尧张留元李洪达尚军帅李军普赵东
Owner ZHONGYUAN SPECIAL STEEL
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