CN108441616A - Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method - Google Patents
Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method Download PDFInfo
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- CN108441616A CN108441616A CN201810352858.2A CN201810352858A CN108441616A CN 108441616 A CN108441616 A CN 108441616A CN 201810352858 A CN201810352858 A CN 201810352858A CN 108441616 A CN108441616 A CN 108441616A
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- torsion beam
- heating furnace
- stress
- temperature
- stove
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vehicle Body Suspensions (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method, including：Torsion beam after cold moudling is vertically placed in heat treatment heating furnace, is filled with inert gas after banking in stove；Start heating furnace temperature-rise period, in-furnace temperature is risen to 560-580 DEG C；Start heating furnace insulating process, in-furnace temperature is made to be kept for 50-70 minutes at a temperature of 560-580 DEG C；Start the air-cooled process of heating furnace, makes torsion beam in descent of temperature to 290-310 DEG C；Torsion beam is taken out from heating furnace, it is naturally cold in air outside stove, it has been released the torsion beam of stress.The positive effect of the present invention is：By the way of being heat-treated to product, the regional stress of stress concentration can be released to greatest extent, and then improve the fatigue resistance of product,（It can reach 450,000 times or more, the product fatigue strength of this technique do not applied to improve 1 times）.Processing method compared with prior art, stress elimination effect is good, meets the idea of development of automotive light weight technology.
Description
Technical field
The invention belongs to automobile manufacturing fields, and in particular to cold stamping shaped station wagon Rear wheel suspension torsion beam.
Background technology
Traditional torsion beam is the U-shaped or V-type beam that is open, by blanking punched+moulding process for being produced in forming process
Raw stress concentration is relatively small, for region of stress concentration take be increase material width make region of stress concentration expand from
And the intensity that dispersive stress is concentrated.
The drawing force that V-shaped Guan Liang is received in drawing process due to V word transitional regions is excessive, can be after flow harden
V word transitional regions generate larger tensile stress, and for the current way of the stress of such Guan Liang, that one is selection intensities is opposite
The tensile property of lower steel steel such as 590DP S420MC, steel itself is good, the stress generated in forming process
Naturally just small, another is to increase material thickness to promote the tensile property of tubing.
For the U-shaped or V-type torsion beam single products weight that is open generally at 15 kilograms or more, in addition intermediate solid drawing
Bar total weight should be at 20 kilograms or so, in order to which region of stress concentration does not fail in fatigue test, often by stress concentration
Which further increases material weights for area's amplification, are unfavorable for the theory of automotive light weight technology.
One class of V-shaped pipe beam piece weight is no more than 10 kilograms and centre is not necessarily to pull rod, meets automotive light weight technology theory, but
The relatively low steel of stress intensity selection intensity in order to reduce region of stress concentration, can reduce the integral strength of product, just
Degree.It is equivalent to and sacrifices product section strength and stiffness to exchange the promotion of fatigue strength for.The product weight if increasing material thickness
It can increase and not meet the idea of development of automotive light weight technology.
Invention content
The object of the present invention is to provide a kind of release stress heat treatments of cold forming high strength steel car Rear secondary frame for vehicle torsion beam
Method is used for the manufacture of small-sized passenger car Rear wheel suspension torsion beam, and processing remaining in previous such torsion beam production is overcome to answer
Aforesaid drawbacks existing for power mode.
The heat treatment method of release stress is after the torsion beam cold moudling of the present invention：
1, enter stove：Torsion beam after cold moudling is vertically placed in heat treatment heating furnace, is filled with indifferent gas after banking in stove
Body；
2, it heats：Start heating furnace temperature-rise period, in-furnace temperature is risen to 560-580 DEG C；
3, it keeps the temperature：Start heating furnace insulating process, in-furnace temperature is made to be kept for 50-70 minutes at a temperature of 560-580 DEG C；
4, air-cooled in stove：Start the air-cooled process of heating furnace, makes torsion beam in descent of temperature to 290-310 DEG C；
5, cooling outside stove：Torsion beam is taken out from heating furnace, it is naturally cold in air outside stove, it has been released the torsion of stress
Beam.
The torsion beam stress release method of above-mentioned steps is well suited to processing and selects material number CP800, DP780, DP980,
Tensile strength is more than the high strength steel of 780MPa.
The positive effect of the present invention is：It, can be maximum by the regional stress of stress concentration by the way of being heat-treated to product
Limit releases, and then improves the fatigue resistance of product,（It can reach 450,000 times or more, do not apply the production of this technique
Product fatigue strength improves 1 times）.Processing method compared with prior art, stress elimination effect is good, meets the development of automotive light weight technology
Theory.
Description of the drawings
Fig. 1 is the torsion beam area of stress concentration metallograph being cold-pressed out.
Fig. 2 is the metallograph using the method for the present invention treated torsion beam original area of stress concentration.
Specific implementation mode
1, standby corresponding size and be configured with temperature sensor, timer, automatic controller heat treatment heating furnace and
Inert gas source sets processing step and process conditions in automatic controller；
2, enter stove：Material is vertically placed in heat treatment for the torsion beam after CP800 or DP780 or DP980 steel cold moudlings
In heating furnace, closes in stove and be filled with inert gas；
3, it heats：Start heating furnace temperature-rise period, in-furnace temperature is risen to 570 DEG C；
3, it keeps the temperature：Start heating furnace insulating process, in-furnace temperature is made to be kept for one hour at a temperature of 570 DEG C；
4, air-cooled in stove：Start the air-cooled process of heating furnace, makes torsion beam in descent of temperature to 300 DEG C；
5, cooling outside stove：Torsion beam is taken out from heating furnace, it is naturally cold in air outside stove, the torsion of stress must be released
Beam.
Claims (1)
1. cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method, including：
（1）Enter stove：Torsion beam after cold moudling is vertically placed in heat treatment heating furnace, is filled with indifferent gas after banking in stove
Body；
（2）Heating：Start heating furnace temperature-rise period, in-furnace temperature risen to 560-580 DEG C,
（3）Heat preservation：Start heating furnace insulating process, in-furnace temperature is made to be kept for 50-70 minutes at a temperature of 560-580 DEG C；
（4）It is air-cooled in stove：Start the air-cooled process of heating furnace, makes torsion beam in descent of temperature to 290-310 DEG C；
（5）It is cooling outside stove：Torsion beam is taken out from heating furnace, it is naturally cold in air outside stove, the torsion of stress must be released
Beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352858.2A CN108441616A (en) | 2018-04-19 | 2018-04-19 | Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810352858.2A CN108441616A (en) | 2018-04-19 | 2018-04-19 | Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108441616A true CN108441616A (en) | 2018-08-24 |
Family
ID=63201069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810352858.2A Pending CN108441616A (en) | 2018-04-19 | 2018-04-19 | Cold forming high strength steel car Rear secondary frame for vehicle torsion beam discharges stress heat-treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108441616A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309605A (en) * | 2016-11-01 | 2017-11-03 | 上海汇众汽车制造有限公司 | The antifatigue processing technology of metal parts, torsion beam processing method and torsion beam |
-
2018
- 2018-04-19 CN CN201810352858.2A patent/CN108441616A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309605A (en) * | 2016-11-01 | 2017-11-03 | 上海汇众汽车制造有限公司 | The antifatigue processing technology of metal parts, torsion beam processing method and torsion beam |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180824 |