Therma processing method for crankshaft of high-power engine

A heat treatment method and engine technology, applied in the field of heat treatment, can solve problems such as failure to meet mechanical performance requirements, failure to meet crankshaft technical requirements, failure to achieve economic benefits, etc., to avoid bending deformation and cracking, and avoid cracking and deformation. , The effect of improving the comprehensive mechanical properties of the crankshaft

Inactive Publication Date: 2004-10-27
CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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Problems solved by technology

Due to the complex shape of the crankshaft, the cross-sectional size of the sampling part is large (φ123), and it is heated horizontally. After vertical quenching with oil, the hardened layer is shallow, which cannot meet the mechanical performance requirements of the sampling part, and the swing is out of tolerance; vertical quenching with water , the hardened layer is deep, although it can meet the mechanical performance requirements of the sampling part, but the cracking tendency is very large, and the scrap rate is high
Obviously, the existing quenching and tempering process cannot meet the technical requirements of the crankshaft after quenching and tempering, and cannot achieve better economic benefits

Method used

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Embodiment Construction

[0019] First, the quenching medium AQ251 is formulated as a quenching liquid at a concentration of 10-13%. Then, the operator uses a crane or other lifting tools to install the crankshaft to be processed on the special tooling for the crankshaft. After filling it according to its loading capacity, it is hoisted into the well-type resistance furnace (for quenching). The heating temperature is 840 ° C, and the heating time is 2.5 hours, the holding time is 2 hours. Quickly move the insulated engine crankshaft into the quenching tank filled with the above-mentioned quenching liquid. The quenching temperature (referring to the temperature when entering the quenching liquid) is 820-830°C, keep the temperature of the quenching liquid at 20-55°C, and the stirring speed is 0.5- 1m / min. Then, after cooling for 6-8 minutes, lift it out and put it into the well-type resistance furnace (for tempering), the heating temperature is 640-660°C, the heating time is 2 hours, and the holding tim...

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Abstract

A technology for thermally treating the crankshaft of high-power engine includes such steps as heating to 830-850 deg.c, holding the temp for 2 hrs, quenching in the liquid at 20-55 deg.C for 6-8 min, tempering at 640-660 deg.C for 3 hrs, and air cooling. Its advantage is high comprehensive mechanical performance of treated crankshaft.

Description

(1) Technical field [0001] The invention relates to a heat treatment process for quenching and tempering a high-power engine crankshaft, which belongs to the technical field of heat treatment. (2) Background technology [0002] The crankshaft material of high-power engines is mostly special 42CrMoA, which needs quenching and tempering treatment after forging and forming. The requirements for comprehensive mechanical properties are relatively high, and the sampling location is at the flange end. Radial swing difference does not exceed 3mm. Due to the complex shape of the crankshaft, the cross-sectional size of the sampling part is large (φ123), and it is heated horizontally. After vertical quenching with oil, the hardened layer is shallow, which cannot meet the mechanical performance requirements of the sampling part, and the swing is out of tolerance; vertical quenching with water , the hardened layer is deep, although it can meet the mechanical performance requirements of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/30
Inventor 庞廷宝李玉新杜运鹏
Owner CHINA NATIONAL HEAVY DUTY TRUCK GROUP
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