Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment

A heat treatment method and technology for trucks, which is applied in the field of heat treatment of spiral bevel gears of trucks, can solve the problems of carburizing and quenching, thermal distortion of gears, high energy consumption, and high production costs, so as to improve carburizing speed, reduce exhaust gas emissions, The effect of metallographic structure and surface hardness optimization

Active Publication Date: 2012-03-14
哈尔滨汇隆汽车箱桥有限公司 +3
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Problems solved by technology

[0003] In order to solve the problems of high energy consumption and high production cost of the existing method, carburizing quenching and gear thermal distortion still exist in the heat treatment and carburizing process, the present invention provides a spiral bevel gear for trucks on double-row rare earth carburizing equipment The specific technical scheme to solve this problem is as follows:

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  • Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment
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  • Heat treatment method of spiral bevel gear of cargo truck on double-row rare earth carburization equipment

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 The present embodiment will be described. The steps of this embodiment method are as follows:

[0016] The rare earth carburizing product is CA457 "Jiefang" truck rear axle main and driven spiral bevel gears, both of which are made of 20CrMnTiH steel; the hardenability of the material is J9=36~42HRC.

[0017] The effective hardened layer depth requirement of carburizing and quenching for driving and driven spiral bevel gears is 1.70-2.10mm; metallographic structure, carbide grade 1-5, martensite and retained austenite grade 1-5; gear surface and core The hardness requirements are 58~63HRC and 35~40HRC respectively; the depth of non-martensitic layer is ≤20um, and the inspection shall be carried out according to the standard of QC / T262-1999 "Metallographic Inspection of Automobile Carburized Gears".

[0018] Step 1. Put the spiral bevel gear on the washing machine, wash it for 5-6 minutes at the temperature of alkaline...

specific Embodiment approach 2

[0024]Specific embodiment two: the difference between this embodiment and specific embodiment one is that in step one, pretreatment is carried out under the condition that the temperature of the pretreatment furnace on the double-row rare earth carburizing equipment is 480 ° C, and the pretreatment time is 120 minutes; step two The temperature in the middle heating zone is preheated under the condition of 870°C, and the preheating time is 300 minutes. At this time, 2 cubic meters of nitrogen gas per hour is input into the furnace; The temperature of the zone is 910°C for pre-carburization, and the pre-carburization time is 300 minutes. At this time, the carbon potential Cp is 1.35%C, propane gas is input at 0.5 cubic meters per hour, nitrogen is input at 2 cubic meters per hour, and methanol per hour 20 milliliters per minute, 25 milliliters per minute of rare earth methanol; in step 4, carburizing is carried out at a temperature of 930° C. after pre-carburizing in step 3 and e...

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Abstract

The invention provides a heat treatment method of a spiral bevel gear of a cargo truck on double-row rare earth carburization equipment, and relates to a carburization heat treatment technological process of the spiral bevel gear of the cargo truck. The invention solves the problems that energy consumption of carburization heat treatment is high, production cost of a product is high and carburization quenching and gear thermal distortion still exist in a carburization process. The method provided by the invention comprises the following steps of: taking a preheating zone as a strong leakage region 1 and taking a carburizing region as a strong leakage region 2, namely taking a region II and a region III as a carburizing speed main control region and taking a region IV and a region V as a metallographic structure main control region, carrying out temperature control in the regions I, II, III, IV and V, carrying out carbon potential control in the regions II, III, IV and V, and inputtingcarburizing medium propane gas, rare earth methanol penetrating agent, nitrogen, methanol and air into a furnace, thus the heat treatment method is realized. The metallographic structure and surface hardness of the spiral bevel gear subjected to the heat treatment method provided by the invention are all optimized, and heat treatment quality of the spiral bevel gear is improved; meanwhile, capacity is improved by 23%, heat treatment production cost is reduced by 18.9%, and pollution of exhaust emission to the environment is reduced.

Description

technical field [0001] The invention relates to a heat treatment method for a spiral bevel gear of a truck, in particular to a carburizing heat treatment process for a spiral bevel gear of a truck on a double-row rare earth continuous gas carburizing automatic production line. Background technique [0002] At present, the spiral bevel gears of trucks are generally produced by continuous gas carburizing automatic production lines, but due to the long production cycle of carburizing heat treatment (generally ten hours to tens of hours), the temperature is as high as 880-940°C, and the equipment power is 500 ~1000kW, so the energy consumption is large, the product production cost is high, and the quality of the spiral bevel gear is poor; and there are still some problems such as carburizing and quenching and gear thermal distortion in the heat treatment and carburizing process. Since the 1990s, many tests have been carried out on the continuous gas carburizing automatic product...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/22
Inventor 金荣植李庆文刘志儒陈云生谢飞刘成友
Owner 哈尔滨汇隆汽车箱桥有限公司
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