CN102806259B - Improve the thermo shaping method of auto parts intensity and plasticity - Google Patents
Improve the thermo shaping method of auto parts intensity and plasticity Download PDFInfo
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- CN102806259B CN102806259B CN201210298894.8A CN201210298894A CN102806259B CN 102806259 B CN102806259 B CN 102806259B CN 201210298894 A CN201210298894 A CN 201210298894A CN 102806259 B CN102806259 B CN 102806259B
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Abstract
The invention discloses a kind of thermo shaping method improving auto parts intensity and plasticity, the method comprises the following steps: the thermoformed parts blank 1) rolling out required composition; 2) thermoformed parts blank is carried out first time heating; 3) be sent to by thermoformed parts blank in the hot-forming die with independent cooling system and carry out hot forming, hot-forming die surface temperature control is at 150 ~ 200 DEG C; 4) when hot forming terminates, when temperature is down to 115 ~ 125 DEG C, open hot-forming die, thermoformed parts is carried out the process of post bake lonneal, temperature is 200 ~ 500 DEG C, heat treatment, after 30 ~ 60 seconds, is shifted out heating furnace and is naturally cooled, and can obtain the hot forming auto parts of high strength and high-ductility.The microstructure adopting the obtainable auto parts of the present invention is evenly tiny lath martensite tissue, and have high strength and high-ductility, percentage elongation also improves greatly.
Description
Technical field
The present invention relates to the manufacturing process of part, refer to a kind of thermo shaping method improving auto parts intensity and plasticity particularly.
Background technology
The auto output of sustainable growth and automobile pollution and energy shortage make the large problem of automobile energy consumption, security and exhaust emissions three become increasingly conspicuous.Adopt high-strength vehicle steel while not affecting vehicle safety, can automotive dead weight be reduced, and the weight of automobile often alleviates 1%, 0.6% ~ 1% can be consumed by fuel saving, thus reduce the exhaust emissions of automobile.
Along with the rapid progress of automotive light weight technology industry, Modern Automobile Body design is just attractive in appearance towards fuel economy, security, environmental friendliness, comfortableness and molding surface, low cost development.For vehicle-body outer panel, require that there is high stamping formabilily and high strength, low resilience, good shape retentivity.And the superhigh intensity of high-strength steel sheet makes steel plate very difficult in part punching is shaped, parts size precision is wayward, diel serious wear, and these main causes make the use of high-strength vehicle steel have significant limitation.
The heat forming technology that current hot forming auto parts use is after influence of high austenizing temp, be shaped at mould punching rapidly, in punching course, steel plate is carried out solid quenching by the mould with cooling system thus obtains lath martensite organizing, thus obtains the intensity of superelevation.But only through Quenching Treatment in this heat forming technology, its carbide is not separated out, and makes martensitic matrix plasticity lower, thus cause auto parts percentage elongation not high, lower than 8%, overall plastic property is not good, thus constrains the extensive use of unimach in automobile industry.
Summary of the invention
The present invention is directed to the inductile problem of current hot forming auto parts high strength, provide a kind of thermo shaping method improving auto parts intensity and plasticity, the method comprises the following steps:
1) roll out thermoformed parts blank, the chemical component weight percentage of described thermoformed parts blank is: C:0.2 ~ 0.3%, Mn:1.4 ~ 1.5%, Si:0.2 ~ 0.3%, Cr:0.1 ~ 0.2%, Ni:0.01 ~ 0.02%, Nb:0.001 ~ 0.0015, Mo:0.004 ~ 0.005%, B:0.001 ~ 0.005%, surplus are Fe;
2) thermoformed parts blank is carried out first time heating, temperature is 850 ~ 900 DEG C, heating and thermal insulation 2 ~ 5 minutes;
3), when coming out of the stove after heating and thermal insulation terminates, be sent to by thermoformed parts blank in the hot-forming die with independent cooling system and carry out hot forming, hot-forming die surface temperature control is at 150 ~ 200 DEG C;
4) when hot forming terminates, when temperature is down to 115 ~ 125 DEG C, hot-forming die is opened, thermoformed parts is carried out the process of post bake lonneal, temperature is 200 ~ 500 DEG C, and heat treatment is after 30 ~ 60 seconds, shift out heating furnace naturally to cool, the hot forming auto parts of high strength and high-ductility can be obtained.
Preferably, step 2 of the present invention) in, heating and thermal insulation is 3 minutes.
Preferably, in step 3) of the present invention, time thermoformed parts blank being sent to hot-forming die is 3 ~ 6 seconds.
Preferably, in step 4) of the present invention, hot forming terminates, and when temperature is down to 120 DEG C, opens hot-forming die.
Beneficial effect of the present invention:
1, after adopting above-mentioned thermoformed parts blank and manufacturing process, the microstructure of obtainable auto parts is evenly tiny lath martensite tissue, Kang La Qiang Du≤1400MPa, Yan Shen Shuai≤and 17%, percentage elongation improves greatly.
2, the Technology for Heating Processing of hot forming auto parts of the present invention is Quench and temper two parts, and the object of tempering is the internal stress eliminating quenching generation, separates out the carbide of a part, can improve the plasticity of martensite steel.
3, the present invention adopts the hot-forming die possessing independent cooling system, and different post bake low tempering temperatures and temperature retention time control, and control part Microstructure evolution, make part have high strength and plasticity proportioning.
Accompanying drawing explanation
Fig. 1 is the original microstructure figure of thermoformed parts blank.
The microstructure figure of the hot forming auto parts that Fig. 2 obtains for employing the inventive method.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the present invention is described in further detail.
Percentage by weight is represented with wt% in following embodiment.
Embodiment 1
1) the thermoformed parts blank with following compositions is rolled out, C:0.2wt%, Mn:1.4wt%, Si:0.2wt%, Cr:0.1wt%, Ni:0.01wt%, Nb:0.001wt%, Mo:0.004wt%, B:0.001 wt%, Fe surplus, the original structure structure of thermoformed parts blank is as shown in Figure 1;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 850 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 150 DEG C;
4) when hot forming terminates, when temperature is 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 200 DEG C, and heat treatment, after 30 seconds, is shifted out heating furnace and naturally cooled, can obtain the hot forming auto parts of high strength and high-ductility, the institutional framework of the hot forming auto parts obtained as shown in Figure 2.After testing, tensile strength is 1550MPa to gained hot forming auto parts, and percentage elongation A10 is 17%.
As can be seen from Figure 1, before carrying out hot forming process, the original structure of part blank is ferrite+pearlite entirely.As can be seen from Figure 2, adopt the hot forming auto parts that the manufacturing process adopted in the present invention obtains, its tissue is lath martensite entirely, thus substantially increases intensity and the plasticity of part.
Embodiment 2
1) the thermoformed parts blank with following compositions is rolled out, C:0.23wt%, Mn:1.42wt%, Si:0.24wt%, Cr:0.16wt%, Ni:0.013wt%, Nb:0.0012wt%, Mo:0.0043wt%, B:0.002wt%, Fe surplus, the original structure structure of thermoformed parts blank is as shown in Figure 1;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 850 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 160 DEG C;
4) when hot forming terminates, when temperature is 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 500 DEG C, and heat treatment, after 30 seconds, is shifted out heating furnace and naturally cooled, can obtain the hot forming auto parts of high strength and high-ductility, the institutional framework of the hot forming auto parts obtained as shown in Figure 2.After testing, tensile strength is 1480MPa to gained hot forming auto parts, and percentage elongation A10 is 20%.
As can be seen from Figure 1, before carrying out hot forming process, the original structure of part blank is ferrite+pearlite entirely.As can be seen from Figure 2, adopt the hot forming auto parts that the manufacturing process adopted in the present invention obtains, its tissue is lath martensite entirely, thus substantially increases intensity and the plasticity of part.
Embodiment 3
1) the thermoformed parts blank with following compositions is rolled out, C:0.25wt%, Mn:1.45wt%, Si:0.25wt%, Cr:0.15wt%, Ni:0.015wt%, Nb:0.0014wt%, Mo:0.0045wt%, B:0.004 wt%, Fe surplus, the original structure structure of thermoformed parts blank is as shown in Figure 1;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 900 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 170 DEG C;
4) when hot forming terminates, when temperature is 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 200 DEG C, and heat treatment, after 60 seconds, is shifted out heating furnace and naturally cooled, can obtain the hot forming auto parts of high strength and high-ductility, the institutional framework of the hot forming auto parts obtained as shown in Figure 2.After testing, tensile strength is 1500MPa to gained hot forming auto parts, and percentage elongation A10 is 18%.
As can be seen from Figure 1, before carrying out hot forming process, the original structure of part blank is ferrite+pearlite entirely.As can be seen from Figure 2, adopt the hot forming auto parts that the manufacturing process adopted in the present invention obtains, its tissue is lath martensite entirely, thus substantially increases intensity and the plasticity of part.
Embodiment 4
1) the thermoformed parts blank with following compositions is rolled out, C:0.3wt%, Mn:1.5wt%, Si:0.3wt%, Cr:0.2wt%, Ni:0.02wt%, Nb:0.0015wt%, Mo:0.005wt%, B:0.005 wt%, Fe surplus, the original structure structure of thermoformed parts blank is as shown in Figure 1;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 900 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 200 DEG C;
4) when hot forming terminates, when temperature is 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 500 DEG C, and heat treatment, after 60 seconds, is shifted out heating furnace and naturally cooled, can obtain the hot forming auto parts of high strength and high-ductility, the institutional framework of the hot forming auto parts obtained as shown in Figure 2.After testing, tensile strength is 1520MPa to gained hot forming auto parts, and percentage elongation A10 is 19%.
As can be seen from Figure 1, before carrying out hot forming process, the original structure of part blank is ferrite+pearlite entirely.As can be seen from Figure 2, adopt the hot forming auto parts that the manufacturing process adopted in the present invention obtains, its tissue is lath martensite entirely, thus substantially increases intensity and the plasticity of part.
Embodiment 5
1) the thermoformed parts blank with following compositions is rolled out, C:0.28wt%, Mn:1.47wt%, Si:0.26wt%, Cr:0.14wt%, Ni:0.019wt%, Nb:0.0011wt%, Mo:0.0046wt%, B:0.003wt%, Fe surplus, the original structure structure of thermoformed parts blank is as shown in Figure 1;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 880 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 180 DEG C;
4) when hot forming terminates, when temperature is 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 400 DEG C, and heat treatment, after 40 seconds, is shifted out heating furnace and naturally cooled, can obtain the hot forming auto parts of high strength and high-ductility, the institutional framework of the hot forming auto parts obtained as shown in Figure 2.After testing, tensile strength is 1510MPa to gained hot forming auto parts, and percentage elongation A10 is 18.5%.
As can be seen from Figure 1, before carrying out hot forming process, the original structure of part blank is ferrite+pearlite entirely.As can be seen from Figure 2, adopt the hot forming auto parts that the manufacturing process adopted in the present invention obtains, its tissue is lath martensite entirely, thus substantially increases intensity and the plasticity of part.
Claims (1)
1. improve a thermo shaping method for auto parts intensity and plasticity, comprise the following steps:
1) the thermoformed parts blank with following chemical composition and percentage by weight is rolled out, C:0.3wt%, Mn:1.5wt%, Si:0.3wt%, Cr:0.2wt%, Ni:0.02wt%, Nb:0.0015wt%, Mo:0.005wt%, B:0.005wt%, surplus is Fe;
2) thermoformed parts blank is put into high-temperature box type heating furnace to heat, furnace temperature is set as 900 DEG C, heating and thermal insulation 3 minutes;
3) when coming out of the stove after heating and thermal insulation terminates, thermoformed parts blank is sent in the hot-forming die with independent cooling system and carries out hot forming, delivery time is 5 seconds, pre-sets hot-forming die cooling system running parameter, by hot-forming die surface temperature control at 200 DEG C;
4) when hot forming terminates, when temperature is down to 120 DEG C, open hot-forming die, thermoformed parts is sent in low temperature box type heater and carries out the process of post bake lonneal, furnace temperature is set as 500 DEG C, heat treatment, after 60 seconds, is shifted out heating furnace and is naturally cooled, and can obtain the hot forming auto parts of high strength and high-ductility.
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| CN103028645A (en) * | 2012-12-31 | 2013-04-10 | 哈尔滨工业大学 | Hot stamping forming method for variable strength distribution strong-strength steel plate part |
| US10767756B2 (en) * | 2015-10-13 | 2020-09-08 | Magna Powertrain Inc. | Methods of forming components utilizing ultra-high strength steel and components formed thereby |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51140817A (en) * | 1975-05-30 | 1976-12-04 | Hitachi Metals Ltd | Martensite tool steel for hot forming |
| CN101280352A (en) * | 2008-05-21 | 2008-10-08 | 钢铁研究总院 | High-safe high-precision producing method of thermoforming martensitic steel parts |
| CN102181790A (en) * | 2011-05-09 | 2011-09-14 | 武汉钢铁(集团)公司 | Steel with 1,300MPa-level tensile strength for automobile safety piece and production method thereof |
| CN102296242A (en) * | 2011-09-13 | 2011-12-28 | 北京科技大学 | Heat treatment method of high strength and toughness hot formed steel plate used for automobile |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51140817A (en) * | 1975-05-30 | 1976-12-04 | Hitachi Metals Ltd | Martensite tool steel for hot forming |
| CN101280352A (en) * | 2008-05-21 | 2008-10-08 | 钢铁研究总院 | High-safe high-precision producing method of thermoforming martensitic steel parts |
| CN102181790A (en) * | 2011-05-09 | 2011-09-14 | 武汉钢铁(集团)公司 | Steel with 1,300MPa-level tensile strength for automobile safety piece and production method thereof |
| CN102296242A (en) * | 2011-09-13 | 2011-12-28 | 北京科技大学 | Heat treatment method of high strength and toughness hot formed steel plate used for automobile |
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Effective date of registration: 20171115 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Co-patentee after: Huazhong University of Science and Technology Patentee after: Wuhan iron and Steel Company Limited Address before: 15 Wuchang, Wuhan Friendship Avenue, No. 999, block A, layer (Wuhan Iron and steel science and technology innovation department), No. 430080, Co-patentee before: Huazhong University of Science and Technology Patentee before: Wuhan Iron & Steel (Group) Corp. |
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