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Carburizing and Quenching Method for Large Excavator Gears

A carburizing quenching and excavator technology, applied in the field of heat treatment, can solve problems such as low carburizing temperature, fluctuation of carbon potential in the furnace, and difficulty in controlling carbon potential, so as to improve tooth surface hardness and wear resistance, and smooth carbon concentration gradient , The effect of shortening the heat treatment time

Active Publication Date: 2018-10-02
CRRC QISHUYAN INSTITUTE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carburizing temperature of this method is low, the strong carburizing potential is high, and a large amount of carbon black is easy to deposit in the furnace, which leads to fluctuations in the carbon potential in the furnace and causes great difficulties in controlling the carbon potential.
At the same time, this method takes a long time to carburize and is at the same temperature. Since the carbide-forming elements such as Cr and W in the steel will form stable alloy carbides with carbon, the carbon absorption capacity is strong, and the carbon concentration of the carburized layer increases. , is not conducive to the diffusion of carbon elements, the concentration gradient of the carburized layer becomes steeper, and large block and network carbides are prone to appear, which destroys the continuity of the matrix structure and seriously affects the quality of the carburized layer, making the gear in the subsequent grinding process Grinding cracks are easy to occur during the process, and the gears are prone to fatigue under the action of periodic contact stress, forming pitting and surface peeling

Method used

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  • Carburizing and Quenching Method for Large Excavator Gears
  • Carburizing and Quenching Method for Large Excavator Gears
  • Carburizing and Quenching Method for Large Excavator Gears

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Embodiment Construction

[0026] See figure 1 As shown, the carburizing and quenching method of the large excavator gear of the present invention comprises the following steps.

[0027] ⑴. In the step of heating and uniform temperature, first place the gear in the carburizing furnace and heat it to 750±10°C, and keep it warm for 3-4h.

[0028] (2) Intensive carburizing step, the temperature of the carburizing furnace is raised, the gear is heated to 960-980°C with the furnace, and the carburizing agent is passed into the carburizing furnace for carburizing, and the carbon potential CP is controlled at 1.30±0.05C%, and the carbon potential is adjusted by adjusting the carburizing The flow of carbon agent is controlled to maintain a period of carburizing time t 强渗 , the carburizing time t during the strong infiltration of the present invention 强渗 It can be controlled within 8-10 hours. By increasing the temperature of strong infiltration and strong carburizing potential, a high carbon concentration is...

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Abstract

The invention relates to a carburizing and quenching method for a large excavator gear. The method comprises the following steps of temperature rising and averaging, high carburizing, dispersing, temperature lowering and averaging, primary quenching, isothermal spheroidizing, secondary quenching and low-temperature tempering. According to the carburizing and quenching method for the large excavator gear, the carburizing and quenching time can be greatly shortened, a high carburizing speed is obtained, energy consumption is reduced, and production efficiency is improved; and meanwhile, grains can be effectively refined, dispersedly-distributed fine-granular carbide is obtained, the metallographic structure of the surface of the gear is improved, tooth face hardness and abrasive resistance are improved, and the service life of the gear is improved.

Description

technical field [0001] The invention relates to a carburizing and quenching method for large excavator gears, belonging to the technical field of heat treatment. Background technique [0002] Excavators are generally driven by electricity, and are construction machinery that realizes continuous operation through the operation of the motor and the gear power of the reduction box. With the rapid development of my country's infrastructure construction in road transportation, energy and water conservancy, and urban construction, the market demand for large excavators is increasing year by year, and the development prospects are strong. However, the working environment of large excavators is relatively complex, and the internal gears of the reduction box are susceptible to failure due to load impact and mechanical vibration. Therefore, large excavator gears not only carry heavy loads and have strong impact, but also require high safety performance. When used, they require excell...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/22C21D1/18C21D9/32C21D1/32
CPCC21D1/18C21D1/32C21D9/32C23C8/22
Inventor 刘聪敏黄星王晓华周冰
Owner CRRC QISHUYAN INSTITUTE CO LTD
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