CN103937933A - Control of process for 45 steel and 50 steel automobile front axles and method thereof - Google Patents
Control of process for 45 steel and 50 steel automobile front axles and method thereof Download PDFInfo
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- CN103937933A CN103937933A CN201410129212.XA CN201410129212A CN103937933A CN 103937933 A CN103937933 A CN 103937933A CN 201410129212 A CN201410129212 A CN 201410129212A CN 103937933 A CN103937933 A CN 103937933A
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Abstract
The invention discloses a control of a process for 45 steel and 50 steel automobile front axles and a method thereof. The process comprises a forging process, pre-treatment and heat treatment processes and is characterized in that the decarburized layer in the induction heating stage of the forging process is reduced, the heating time is controlled and defects caused by too deep decarbonization are avoided while the initial forging temperature and the final forging temperature are strictly controlled, a reasonable cooling method in the pretreatment process and reasonable quenching temperature, heat preservation time and a quenching medium during heat treatment are selected. The control disclosed by the invention overcomes the deficiencies of the prior art and has a rational design, defects of uneven hardness and poor microstructure of the front axles are solved, the hardness uniformity of the front axles are increased and the service life of the front axles are also prolonged.
Description
Technical field
The present invention relates to auto parts technical field, specifically belong to a kind of 45 steel, 50 steel automobile front axle technology controlling and process and methods thereof.
Background technology
Automobile front axle is very important safety member in automobile chassis, due to weight-carrying capacity is large and military service process in bear the stress of alternation complexity, heat treatment technics requires high, inner quality is very strict.Front shaft material mainly contains 45 steel, 50 steel, 40Cr or 42CrMo etc., and heat treatment requirements modifier treatment, ensures hardness, metallographic structure, must ensure again fatigue property simultaneously.
40Cr or 42CrMo front axle be according to GB3077-88 standard recommendation oil quenching, but be generally difficult to reach technical requirements, at present the PAG class water-soluble quenching mediums that adopt more.45 steel or 50 steel are because hardening capacity is poor, and thermal treatment difficulty is relatively large, have that surface hardness is inhomogeneous, core structure is defective, fatigue property is defective and the defect such as hardening break more.
Summary of the invention
45 steel, 50 steel automobile front axle technology controlling and process and methods thereof are the object of this invention is to provide, in forging process process, reduce the Decarburized layer in induction heating stage, control heat-up time, avoided decarburization to cross the bad of dark generation, simultaneously strict initial forging temperature and the final forging temperature controlled; In preprocessing process, adopt the rational type of cooling, in heat treatment process, adopt rational quenching temperature, soaking time and quenchant, improve the defect that front axle hardness is inhomogeneous, metallographic structure is poor, improved the homogeneity of front axle hardness, the work-ing life of having improved front axle.
The technical solution used in the present invention is as follows:
45 steel, 50 steel automobile front axle technology controlling and process and methods thereof, comprise forging process, pre-treatment and thermal treatment, it is characterized in that: the Decarburized layer that reduces the induction heating stage in described forging process process, to be controlled at 18-20min heat-up time, controlling initial forging temperature is 1250 DEG C, final forging temperature is controlled at 800 DEG C-950 DEG C, after forging in described preprocessing process, air cooling is put separately in employing, 80 DEG C of above hot water carry out cooling, the cold mode of air blast cooling or mist is cooling, described thermal treatment process, 850 ± 30 DEG C of quenching temperatures, soaking time 1.5-2.0min/mmX workpiece net thickness+30min, quenchant adopts the profit water-soluble quenching medium KR7280 of section of 3%-8% concentration.
Last regional temperature of described heat treatment heating furnace is controlled at 700 DEG C.
In described heat treatment process, will enter water and be placed on mid-way, water pump adopts pump more than 30m.
Compared with the prior art, beneficial effect of the present invention is as follows:
The present invention, to reduce the Decarburized layer in induction heating stage in forging process process, controls heat-up time, has avoided decarburization to cross the bad of dark generation, simultaneously strict initial forging temperature and the final forging temperature controlled; In preprocessing process, adopt the rational type of cooling, in heat treatment process, adopt rational quenching temperature, soaking time and quenchant, improve the defect that front axle hardness is inhomogeneous, metallographic structure is poor, improved the homogeneity of front axle hardness, the work-ing life of having improved front axle.。
Brief description of the drawings
Fig. 1 is complete processing schematic diagram of the present invention
Fig. 2 is 45 steel, 50 steel front axle heat treatment technics requirements.
embodiment
Referring to accompanying drawing, 45 steel, 50 steel automobile front axle technology controlling and process and methods thereof, comprise forging process, pre-treatment and thermal treatment, it is characterized in that: the Decarburized layer that reduces the induction heating stage in described forging process process, to be controlled at 18-20min heat-up time, controlling initial forging temperature is 1250 DEG C, final forging temperature is controlled at 800 DEG C-950 DEG C, after forging in described preprocessing process, air cooling is put separately in employing, 80 DEG C of above hot water carry out cooling, the cold mode of air blast cooling or mist is cooling, described thermal treatment process, 850 ± 30 DEG C of quenching temperatures, soaking time 1.5-2.0min/mmX workpiece net thickness+30min, quenchant adopts the profit water-soluble quenching medium KR7280 of section of 3%-8% concentration, last regional temperature of heat treatment heating furnace is controlled at 700 DEG C, in heat treatment process, will enter water and be placed on mid-way, water pump adopts pump more than 30m.
Claims (3)
1.45 steel, 50 steel automobile front axle technology controlling and process and methods thereof, comprise forging process, pre-treatment and thermal treatment, it is characterized in that: the Decarburized layer that reduces the induction heating stage in described forging process process, to be controlled at 18-20min heat-up time, controlling initial forging temperature is 1250 DEG C, final forging temperature is controlled at 800 DEG C-950 DEG C, after forging in described preprocessing process, air cooling is put separately in employing, 80 DEG C of above hot water carry out cooling, the cold mode of air blast cooling or mist is cooling, described thermal treatment process, 850 ± 30 DEG C of quenching temperatures, soaking time 1.5-2.0min/mmX workpiece net thickness+30min, quenchant adopts the profit water-soluble quenching medium KR7280 of section of 3%-8% concentration.
2. 45 steel according to claim 1,50 steel automobile front axle technology controlling and process and methods thereof, is characterized in that: last regional temperature of described heat treatment heating furnace is controlled at 700 DEG C.
3. 45 steel according to claim 1,50 steel automobile front axle technology controlling and process and methods thereof, is characterized in that: in described heat treatment process, will enter water and be placed on mid-way, water pump adopts pump more than 30m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410129212.XA CN103937933A (en) | 2014-04-01 | 2014-04-01 | Control of process for 45 steel and 50 steel automobile front axles and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410129212.XA CN103937933A (en) | 2014-04-01 | 2014-04-01 | Control of process for 45 steel and 50 steel automobile front axles and method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN103937933A true CN103937933A (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410129212.XA Pending CN103937933A (en) | 2014-04-01 | 2014-04-01 | Control of process for 45 steel and 50 steel automobile front axles and method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964988A (en) * | 2019-12-26 | 2020-04-07 | 马钢轨道交通装备有限公司 | A3 axle steel and A3 axle and heat treatment process method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104854A (en) * | 1985-06-21 | 1987-01-28 | 武进齿轮厂 | No. 45 steel fine module gear forged harding technology and quenching machine |
| JPH0790380A (en) * | 1993-09-17 | 1995-04-04 | Nippon Steel Corp | Production of induction-hardened part |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
-
2014
- 2014-04-01 CN CN201410129212.XA patent/CN103937933A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85104854A (en) * | 1985-06-21 | 1987-01-28 | 武进齿轮厂 | No. 45 steel fine module gear forged harding technology and quenching machine |
| JPH0790380A (en) * | 1993-09-17 | 1995-04-04 | Nippon Steel Corp | Production of induction-hardened part |
| CN102605159A (en) * | 2012-03-01 | 2012-07-25 | 湖北神力锻造有限责任公司 | Waste heat temperature control quenching process method for front axle of large-scale vehicle |
Non-Patent Citations (3)
| Title |
|---|
| 刘殿礼: "汽车前轴热水处理的研究", 《鞍山科技大学学报》, vol. 14, no. 01, 31 March 1991 (1991-03-31) * |
| 左永平等: "汽车前轴工艺控制及常见问题处理方法", 《热处理技术与装备》, vol. 33, no. 6, 31 December 2012 (2012-12-31) * |
| 李淑英等: "汽车前轴调质热处理生产线的改进", 《热加工工艺》, vol. 36, no. 12, 25 June 2007 (2007-06-25) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964988A (en) * | 2019-12-26 | 2020-04-07 | 马钢轨道交通装备有限公司 | A3 axle steel and A3 axle and heat treatment process method thereof |
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Application publication date: 20140723 |