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Rare earth and carbon co-infiltration method in continuous furnace for automobile gearbox gear

A technology of automobile gearbox and continuous furnace, applied in the field of carburizing, can solve the problems of low efficiency, unreasonable, high energy consumption, etc., and achieve the effect of high technology level, fast infiltration rate and high wear resistance

Inactive Publication Date: 2005-08-17
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the five intervals, only the III area is actually carburized, and the other four areas only play an auxiliary role. The effective use of the carburizing interval is too short, which is obviously unreasonable. The result must be low penetration rate, low efficiency, High energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0018] Specific embodiment one: In this embodiment, the rare earth co-infiltration treatment is carried out to the automobile gearbox gear in this way: a, the pretreated workpiece is sent into a continuous carburizing furnace in which each section is equipped with a rare earth co-infiltration agent, and the workpiece Enter zone I, and carry out preheating and pre-infiltration treatment at a temperature of 840-890°C; b. Enter zone II and zone III in turn, at a temperature of 840-890°C and a carbon potential of 1.15-1.25% carry out carburizing treatment; c, then enter IV zone, and carry out diffusion treatment under the conditions of temperature 840-890°C and carbon potential of 0.8-1.05%; d, finally enter V zone, at temperature 840-890°C, carbon Under the condition that the potential is 0.8-1.05%, it is waiting to be released and quenched. In this embodiment, after the rare earth is added, the function settings of the continuous furnace are greatly changed. In addition to retai...

specific Embodiment approach 2

[0020] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the rare earth infiltration agent is composed of the following components according to the weight ratio: lanthanum chloride or cerium chloride 10-40, carbonate 50-60, Urea 10-20, sodium acetate 15-20, yellow blood salt 10-30. Described carbonate is barium carbonate and sodium carbonate.

specific Embodiment approach 3

[0021] Specific Embodiment Three: See Table 3 for the weight ratio of each component in the rare earth co-penetration agent of this embodiment.

[0022] Lanthanum chloride or cerium chloride

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Abstract

The continuous micro deformation RE-carbon co-penetrating process for gear of automobile gear box is realized via making the pre-treated workpiece enter the different regions with RE co-penetrant in continuous carbonizing furnace at 840-890 deg.c. The workpiece is made to enter successively region-I for preheating and pre-penetrating; region-II and region-III with carbon potential of 1.15-1.25 % for carbonizing; region-IV with carbon potential of 0.8-1.05 % for diffusion treatment; and region-V with carbon potential of 0.8-1.05 % for waiting for discharging and quenching. The present invention is one controllable low temperature RE high concentration gas carbonizing process capable of resulting in optimal metallurgical structure, and has the advantages of high carbonizing rate, high efficiency and low power consumption.

Description

Technical field: [0001] The invention relates to a carburizing method, in particular to a carburizing method for car gearbox gears in a continuous carburizing furnace using a rare earth co-penetrating agent. Background technique: [0002] At present, 20CrMnTi or 20CrMoH steel is generally used in automobile gearbox gears in my country. Since the size of 20CrMnTi steel changes greatly before and after carburizing, and the regularity is not strong and difficult to control, 20CrMoH (or 22CrMoH) steel is mainly used. If the deformation is not properly crafted, it will also fail to meet international standards. In order to meet the international standard, the gear grinding process has to be adopted, and the gear grinding is a low-efficiency and expensive process, which not only prolongs the production cycle, but also increases the production cost. As we all know, solving gear deformation is a systematic project, involving the smelting quality of steel, rolling of steel, forging a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/20
Inventor 闫牧夫刘志儒
Owner HARBIN INST OF TECH
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