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Heat treating method of thin sheet steel type part

A heat treatment method and thin steel sheet technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve problems such as product quality requirements and cost conflicts, and achieve the effects of shortening the production cycle, saving energy, and reducing deformation

Active Publication Date: 2009-03-11
NINGBO HONGXIE CLUTCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a heat treatment method for thin steel sheet parts, so as to solve the defects of serious conflicts between product quality requirements and cost in the prior art

Method used

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  • Heat treating method of thin sheet steel type part
  • Heat treating method of thin sheet steel type part
  • Heat treating method of thin sheet steel type part

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Embodiment 1

[0026] A heat treatment method for thin steel sheet parts, comprising the following steps:

[0027] 1) Exhaust, send methanol and ammonia gas to discharge the air in the furnace, and close the exhaust hole after the air is exhausted;

[0028] 2) On the carbon potential, evenly heat the parts for 25~35 minutes, the temperature is 790℃~800℃, use acetone as co-infiltration, and the dosage is 160~200 drops / hour;

[0029] 3) Rapid carburizing, co-infiltration temperature 790°C-800°C, carbon potential 1.8%-1.9%, time 30-45 minutes, use acetone, methanol, ammonia gas mixture, the content is 80 drops / hour of acetone, 200 drops of methanol drops / hour, ammonia 150 liters / hour;

[0030] 4) Cool down in both, the cooling time is 30 minutes to 45 minutes to drop to a temperature of 760 ° C ~ 770 ° C, keep warm for 1 ~ 2 minutes and start the dilution pump at the same time, and stabilize the carbon potential at 1.4% ~ 1.5%;

[0031] 5) Quenching, the quenching transfer time is ≤20 seconds...

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Abstract

The invention relates to a heat treatment method for a part of the thin steel sheet class. The method comprises the following steps: (1) exhaust; (2) lifting of carbon potential; (3) rapid carburization; (4) even cooling; (5) quenching; and (6) deoiling, low-temperature tempering to complete the process of heat treatment. The heat treatment method uses the process of low-temperature treatment, causes small deformation to a flake-type part, omits the trivial working procedures of flat clamping and tempering, accelerates the production schedule; compared with the prior art, the method reduces the production time by 40 minutes per furnace and shortens the production period by 20 percent; simultaneously, the low-temperature process reduces electricity consumption, saves energy and can not generate mass black carbon; and the obtained finished part has high surface hardness, slightly reduces the strength, and has good plasticity; and the method is suitable for treating the thin steel sheet type part which has small stress, requires wearing resistance and is easy to deform, thereby having large popularization and application potential.

Description

technical field [0001] The invention belongs to the field of metal heat treatment technology, in particular to a metal sheet heat treatment technology. Background technique [0002] Automobile clutches are mainly composed of some thin steel plate type parts. figure 1 The iron pad shown is one of the representative parts. No. 10 steel is directly carbonitrided after being stamped and formed. The effective hardened layer depth is required to be 0.1~0.2mm, the surface hardness is ≥HV600, and the flatness is ≤0.4mm. For a long time, there has been a difficult problem in the process: because the thin sheet parts are easily deformed, the leveling and tempering process has to be added, which not only reduces the efficiency, but also reduces the hardness and wear resistance of the final parts (only ≥ HV500, and even lower). The heat treatment methods in the prior art can be roughly divided into two types, one is medium-temperature co-infiltration in well-type furnace, hot oil quen...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/18C23C8/22
Inventor 汤渝正
Owner NINGBO HONGXIE CLUTCH
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