CN107419206A - A kind of heat treatment method of automotive safety part forging - Google Patents
A kind of heat treatment method of automotive safety part forging Download PDFInfo
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- CN107419206A CN107419206A CN201710688349.2A CN201710688349A CN107419206A CN 107419206 A CN107419206 A CN 107419206A CN 201710688349 A CN201710688349 A CN 201710688349A CN 107419206 A CN107419206 A CN 107419206A
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- forging
- heat treatment
- automotive safety
- safety part
- temperature
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/05—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys of the Al-Si-Mg type, i.e. containing silicon and magnesium in approximately equal proportions
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Forging (AREA)
Abstract
The invention belongs to automotive safety part processing technique field, more particularly to a kind of heat treatment method of automotive safety part forging, the material of the automotive safety part forging is aluminium alloy 6082, including delays warm heating and thermal insulation, quick heating and thermal insulation, precooling and water cooling, again heating and the several steps of oil cooling.The present invention has advantages below compared with prior art：By controlling each phase heat treatment programming rate and soaking time in the present invention, crystal grain is grown up after avoiding forging heat treatment, maintain original state fine grain, combined using a variety of types of cooling, cooling velocity is fast and abundant, forging intensity can be effectively improved, after water cooling, heating and heat preservation is handled again, and casting can be made to obtain good comprehensive mechanical property.
Description
Technical field
The invention belongs to automotive safety part processing technique field, and in particular to a kind of heat treatment side of automotive safety part forging
Method.
Background technology
In forging production process, forge the forging of shaping, its internal grain compared with it is thick, stress is larger, and hydrogen content compared with
It is big, it is necessary to by being heat-treated after forging come crystal grain thinning, eliminating stress and expand hydrogen etc. so that its interior tissue obtains effectively relatively becoming,
Current forges rear Technology for Heating Processing, the hydrogen in forging is not spread into effusion fully, that is, it is not thorough to expand hydrogen so that after forging at heat
The forging of reason, its internal hydrogen content is exceeded, and in actual use, there is the safety of hydrogen embrittlement fracture is hidden for this forging
Suffer from；Wherein aluminum alloy forge piece, because reaching more than 40% with lighter forge weight, higher tensile strength, elongation, spy
The safety member for being used in automobile it is not adapted to, the wherein tensile strength of the forging of aluminium alloy 6082 is more than 310MPa, hardness HB90-
110, it is heat-treated after needs on the basis of meeting its mechanical performance are forged to forging, avoids breaking in actual use
Split.
The content of the invention
The purpose of the present invention is to be directed to the problem of existing, there is provided a kind of heat treatment method of automotive safety part forging.
The present invention is achieved by the following technical solutions：A kind of heat treatment method of automotive safety part forging, the vapour
The material of car safety member forging is aluminium alloy 6082, is comprised the following steps：
（1）Forging is heated to by 350-400 DEG C of 25-30 points of scope inside holding with 30-40 DEG C/h heating rate in heating furnace
Clock；
（2）Continue to heat forging, it is small that forging is heated into 780-820 DEG C of scope inside holding 2 with 55-65 DEG C/h heating rate
When, after making the temperature at each position of workpiece reach uniformly, continue to be incubated 4-6 hours；
（3）Precooling 5-8 minutes are carried out to forging with the nitrogen that temperature is 85-95 DEG C, are then placed in the clear water that temperature is 75-80 DEG C
Middle carry out water cooling, forging surface temperature is water-cooled to as 240-260 DEG C；
（4）Forging is heated to by 420-450 DEG C of 40-50 points of scope inside holding with 45-50 DEG C/h heating rate in reheating furnace
Clock, after making the temperature at each position of workpiece reach uniformly, continue to be incubated 10-12 hours；
（5）It is 140-160 DEG C to be cooled to surface temperature with oil of the temperature less than 60 DEG C, completion heat treatment of coming out of the stove.
As further improvement of these options, heating furnace is electrical heating annular furnace, the temperature control of electrical heating annular furnace
Precision processed is ± 5 DEG C.
As further improvement of these options, the oily cooling oil is N15 machine oil；Used during the water cooling
Mixer is stirred radiating, and mixing speed is 20-30 revs/min；The equal grain size of the automotive safety part forging is not less than 8
Level.
The present invention has advantages below compared with prior art：
By controlling each phase heat treatment programming rate and soaking time in the present invention, crystal grain is grown after avoiding forging heat treatment
Greatly, original state fine grain is maintained, is combined using a variety of types of cooling, cooling velocity is fast and abundant, and it is strong can to effectively improve forging
Degree, after water cooling, heating and heat preservation is handled again, and casting can be made to obtain good comprehensive mechanical property, obtain tempered sorbite,
With higher toughness and intensity, with high tempering to eliminate internal stress and improve tissue and performance, internal stress can be eliminated, and
Improve tissue and performance, further crystal grain thinning, reduce hardness, greatly improved using high tempering plasticity, there is forging
Certain hardness and intensity, has good plasticity and toughness again, and combination property is preferable；
Through ultrasonic wave recombination pressure container flaw detection JB4730.3-2005 standard I levels, according to GB/T6394-2002 standards, grain size
Grade reaches 8 grades, and property indices are satisfied by requiring.
Embodiment
Embodiment 1
A kind of heat treatment method of automotive safety part forging, the material of the automotive safety part forging is aluminium alloy 6082, including
Following steps：
（1）Forging is heated to 28 minutes by 380 DEG C of scope inside holdings with 35 DEG C/h heating rate in heating furnace；
（2）Continue to heat forging, forging is heated to 2 hours by 800 DEG C of scope inside holdings with 60 DEG C/h heating rate, makes workpiece
After the temperature at each position reaches uniformly, continue insulation 5 hours；
（3）Precooling is carried out 6 minutes to forging with the nitrogen that temperature is 90 DEG C, is then placed in the clear water that temperature is 78 DEG C and enters water-filling
Cooling, forging surface temperature is water-cooled to as 250 DEG C；
Radiating is stirred with mixer during the water cooling, mixing speed is 25 revs/min；
（4）Forging is heated to 45 minutes by 430 DEG C of scope inside holdings with 48 DEG C/h heating rate in reheating furnace, makes workpiece each
After the temperature at individual position reaches uniformly, continue insulation 11 hours；
（5）Surface temperature is cooled to as 150 DEG C with N15 machine oil of the temperature less than 60 DEG C, completion heat treatment of coming out of the stove.
Wherein, heating furnace is electrical heating annular furnace, and the temperature control precision of electrical heating annular furnace is ± 5 DEG C.
Embodiment 2
A kind of heat treatment method of automotive safety part forging, the material of the automotive safety part forging is aluminium alloy 6082, including
Following steps：
（1）Forging is heated to 30 minutes by 350 DEG C of scope inside holdings with 30 DEG C/h heating rate in heating furnace；
（2）Continue to heat forging, forging is heated to 2 hours by 780 DEG C of scope inside holdings with 65 DEG C/h heating rate, makes workpiece
After the temperature at each position reaches uniformly, continue insulation 6 hours；
（3）Precooling is carried out 5 minutes to forging with the nitrogen that temperature is 95 DEG C, is then placed in the clear water that temperature is 75 DEG C and enters water-filling
Cooling, forging surface temperature is water-cooled to as 260 DEG C；
Radiating is stirred with mixer during the water cooling, mixing speed is 30 revs/min；
（4）Forging is heated to 50 minutes by 420 DEG C of scope inside holdings with 50 DEG C/h heating rate in reheating furnace, makes workpiece each
After the temperature at individual position reaches uniformly, continue insulation 10 hours；
（5）Surface temperature is cooled to as 140 DEG C with N15 machine oil of the temperature less than 60 DEG C, completion heat treatment of coming out of the stove.
Embodiment 3
A kind of heat treatment method of automotive safety part forging, the material of the automotive safety part forging is aluminium alloy 6082, including
Following steps：
（1）Forging is heated to 25 minutes by 400 DEG C of scope inside holdings with 40 DEG C/h heating rate in heating furnace；
（2）Continue to heat forging, forging is heated to 2 hours by 820 DEG C of scope inside holdings with 55 DEG C/h heating rate, makes workpiece
After the temperature at each position reaches uniformly, continue insulation 4 hours；
（3）Precooling is carried out 8 minutes to forging with the nitrogen that temperature is 85 DEG C, is then placed in the clear water that temperature is 80 DEG C and enters water-filling
Cooling, forging surface temperature is water-cooled to as 240 DEG C；
Radiating is stirred with mixer during the water cooling, mixing speed is 20 revs/min；
（4）Forging is heated to 40 minutes by 450 DEG C of scope inside holdings with 45-50 DEG C/h heating rate in reheating furnace, makes work
After the temperature at each position of part reaches uniformly, continue insulation 12 hours；
（5）Surface temperature is cooled to as 160 DEG C with N15 machine oil of the temperature less than 60 DEG C, completion heat treatment of coming out of the stove.
Control group 1 is set, by step（1）Remove, remaining content is in the same manner as in Example 1；Control group 2 is set, will be implemented
The step of example 1（1）In 35 DEG C/h replace with 65 DEG C/h, remaining content is constant；Control group 3 is set, by the step of embodiment 1（3）Middle nitrogen
Gas precooling replaces with air precooling, and remaining content is constant；Control group 4 is set, by step in embodiment 1（3）It is middle with nitrogen precooled
Remove, remaining content is constant；Control group 5 is set, by step（5）Middle N15 machine oil cooling replaces with clear water cooling, and remaining content is not
Become；Each group mechanical property is detected under normal temperature condition and hot conditions, obtained to draw a conclusion：
Table 1
| Group | Room temperature Rm（MPa） | Room temperature Rp0.2（MPa） | 350℃Rm（MPa） | 350℃Rp0.2（MPa） |
| Index request | ≥400 | 200-280 | ≥350 | ≥160 |
| Embodiment 1 | 428 | 265 | 386 | 196 |
| Embodiment 2 | 432 | 272 | 385 | 194 |
| Embodiment 3 | 433 | 268 | 387 | 195 |
| Control group 1 | 416 | 255 | 346 | 176 |
| Control group 2 | 387 | 243 | 329 | 182 |
| Control group 3 | 422 | 262 | 343 | 185 |
| Control group 4 | 405 | 237 | 328 | 167 |
| Control group 5 | 394 | 254 | 347 | 173 |
The automotive safety part forging satisfactory mechanical property after being heat-treated in the present invention is can be seen that by data in table 1, in high temperature
Under the conditions of tensile strength and yield strength retentivity it is good, disclosure satisfy that its mechanical requirements, increase the service life.
Claims (5)
1. a kind of heat treatment method of automotive safety part forging, the material of the automotive safety part forging is aluminium alloy 6082, its
It is characterised by, comprises the following steps：
（1）Forging is heated to by 350-400 DEG C of 25-30 points of scope inside holding with 30-40 DEG C/h heating rate in heating furnace
Clock；
（2）Continue to heat forging, it is small that forging is heated into 780-820 DEG C of scope inside holding 2 with 55-65 DEG C/h heating rate
When, after making the temperature at each position of workpiece reach uniformly, continue to be incubated 4-6 hours；
（3）Precooling 5-8 minutes are carried out to forging with the nitrogen that temperature is 85-95 DEG C, are then placed in the clear water that temperature is 75-80 DEG C
Middle carry out water cooling, forging surface temperature is water-cooled to as 240-260 DEG C；
（4）Forging is heated to by 420-450 DEG C of 40-50 points of scope inside holding with 45-50 DEG C/h heating rate in reheating furnace
Clock, after making the temperature at each position of workpiece reach uniformly, continue to be incubated 10-12 hours；
（5）It is 140-160 DEG C to be cooled to surface temperature with oil of the temperature less than 60 DEG C, completion heat treatment of coming out of the stove.
2. a kind of heat treatment method of automotive safety part forging as claimed in claim 1, it is characterised in that heating furnace is electrical heating
Annular furnace, the temperature control precision of electrical heating annular furnace is ± 5 DEG C.
A kind of 3. heat treatment method of automotive safety part forging as claimed in claim 1, it is characterised in that the oily cooling oil
For N15 machine oil.
A kind of 4. heat treatment method of automotive safety part forging as claimed in claim 1, it is characterised in that the water cooling process
Middle to be stirred radiating with mixer, mixing speed is 20-30 revs/min.
A kind of 5. heat treatment method of automotive safety part forging as claimed in claim 1, it is characterised in that the automotive safety part
The equal grain size of forging is not less than 8 grades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710688349.2A CN107419206A (en) | 2017-08-12 | 2017-08-12 | A kind of heat treatment method of automotive safety part forging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710688349.2A CN107419206A (en) | 2017-08-12 | 2017-08-12 | A kind of heat treatment method of automotive safety part forging |
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| Publication Number | Publication Date |
|---|---|
| CN107419206A true CN107419206A (en) | 2017-12-01 |
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| CN201710688349.2A Pending CN107419206A (en) | 2017-08-12 | 2017-08-12 | A kind of heat treatment method of automotive safety part forging |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104674144A (en) * | 2015-02-28 | 2015-06-03 | 钢铁研究总院 | Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor |
-
2017
- 2017-08-12 CN CN201710688349.2A patent/CN107419206A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104674144A (en) * | 2015-02-28 | 2015-06-03 | 钢铁研究总院 | Heat treatment method of large-size, high-strength and fine-grain nickel-based superalloy forge piece for nuclear reactor |
Non-Patent Citations (1)
| Title |
|---|
| （美）迈利克: "《汽车轻量化——材料、设计与制造》", 31 May 2012 * |
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Application publication date: 20171201 |
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