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Heat Treatment Method for Pinion Gears of Automobile Electric Steering System

A technology of electric steering system and heat treatment method, used in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of large differences in hardness, uneven matching of gear strength and toughness, etc., to achieve high uniformity and ensure tooth shape accuracy. and gear mechanical properties, the effect of solving the difference in mechanical properties

Active Publication Date: 2020-09-04
厦门真冈热处理有限公司
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AI Technical Summary

Problems solved by technology

Using the existing heat treatment process, it is found that the uniformity of the strength and toughness matching of gears is not high, and the hardness of different batches of parts, or the same part of different parts in the same furnace or different positions of a single part is quite different.

Method used

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  • Heat Treatment Method for Pinion Gears of Automobile Electric Steering System
  • Heat Treatment Method for Pinion Gears of Automobile Electric Steering System
  • Heat Treatment Method for Pinion Gears of Automobile Electric Steering System

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Embodiment Construction

[0027] Please refer to figure 2 , image 3 and Figure 4 , a heat treatment method for a pinion gear of an automotive electric steering system, including the steps of charging, heating, quenching, and tempering in sequence.

[0028] Loading step: the gear 10 is installed in the material basket 20, and the distance between the gears 10 and 10 is kept 1-5 cm. Preferably, the distance between the gears 10 is 2-3 cm. Preferably, the gear 10 is placed vertically with the big end facing down. Preferably, the material basket 20 includes a horizontally arranged loading mesh 22 and a horizontally arranged separating mesh 24, the gear 10 stands on the loading mesh 22, the separating mesh 24 is located above the loading mesh, and the separating mesh 24 Corresponding to each gear, there is a grid 242 to frame the gear 10, and the corresponding four corners of the loading mesh 22 and the separating mesh 24 are respectively connected in series with connecting rods 26, and the loading m...

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Abstract

The invention discloses a heat treatment method of a pinion of an automobile electric steering system. The heating furnace reaches the temperature of 810-830 DEG C, a material basket is fed into the heating furnace, the temperature of the heating furnace is gradually reduced to 580-620 DEG C, the temperature is gradually increased to 810-830 DEG C, the temperature of the heating furnace continuesto rise to 850 + / -5 DEG C, and the temperature is kept for 135-160 minutes, at the same time, the carbon potential CP is controlled to be within the range of 0.4 + / -0.05%; the oil temperature is 70 DEG C + / -10 DEG C, and the tempering temperature is 620 + / -5 DEG C. The gears are subjected to heat preservation at 850 + / -5 DEG C for 135-160 minutes in the heating furnace, so that alloy elements arefully dissolved into austenite and are uniform, the austenite with more uniform components can be obtained, and the hardenability is improved, meanwhile, the temperature of the inner surface of the quenching front gear tends to be consistent, the hardness drop is reduced, the uniformity is improved, the distortion during quenching is controlled, and the mechanical property is facilitated..

Description

technical field [0001] The invention relates to a heat treatment method of a gear, in particular to a heat treatment method of a pinion of an electric steering system of an automobile. Background technique [0002] Electric power steering system (EPS) technology is the "high technology" of auto parts. It is the development direction of automobile steering system. From a global point of view, more than 50% of automobiles are equipped with EPS, and about 35% of passenger cars in my country use EPS. Compared with the steering shaft and rack or EPS, the pinion electric steering system (P-EPS) has a compact structure, which increases the stiffness of the steering system and has excellent dynamic and flexible performance and other technical advantages. Among them, the pinion is the core component of P-EPS to achieve power steering. Due to the characteristics of processing and use, the pinion needs to be quenched and tempered. Considering that customers use P-EPS for high-end passen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/32C21D1/18
CPCC21D1/18C21D9/32
Inventor 胡大维张雪梅胡敬华
Owner 厦门真冈热处理有限公司
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