CN102389917A - Thermoforming method of metal composite board - Google Patents

Thermoforming method of metal composite board Download PDF

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Publication number
CN102389917A
CN102389917A CN2011102965551A CN201110296555A CN102389917A CN 102389917 A CN102389917 A CN 102389917A CN 2011102965551 A CN2011102965551 A CN 2011102965551A CN 201110296555 A CN201110296555 A CN 201110296555A CN 102389917 A CN102389917 A CN 102389917A
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CN
China
Prior art keywords
board
temperature
sheet
die
thermoforming
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Application number
CN2011102965551A
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Chinese (zh)
Inventor
马宁
胡平
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大连理工大学
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Priority to CN2011102965551A priority Critical patent/CN102389917A/en
Publication of CN102389917A publication Critical patent/CN102389917A/en

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Abstract

The invention discloses a thermoforming method of a metal composite board. The method comprises the following steps of: putting a board in a numerical control heating furnace with a segmental heating function so that the board is heated according to four temperature areas in the length direction of the board, and carrying out heat insulation for 3 minutes, wherein the four temperature areas of the board are respectively between 550 DEG C and 650 DEG C, between 650 DEG C and 750 DEG C, between 750 DEG C and 850 DEG C and between 900 DEG C and 1000 DEG C; and then thermoforming the board in a die distributed with different cooling pipelines, wherein the die comprises an upper die and a lower die, and the part where the distribution density of the cooling pipelines is large corresponds to the high-temperature part of the board. In the invention, through controlling the heating temperature in the thermoforming process and the distribution of the cooling pipelines of the die, a special metal composite board of which material properties are in continuous gradient distribution along the length direction is obtained, and the metal composite board is quite suitable to serve as an impact-resistance material.

Description

A kind of thermo shaping method of metallic composite panel

Technical field

The present invention relates to the thermo shaping method of a kind of manufacturing process of sheet metal, particularly a kind of metallic composite panel.

Background technology

High-strength steel sheet hot forming technology is also referred to as the drop stamping technology, more and more receives the concern of industrial quarters.The technical advantage of heat forming technology is: can carry parts up to the complicacy of 1500MPa by fabrication strength; Under the high temperature, material plasticity, formability are good, can the complicated stamping parts of once-forming; Shaping can be eliminated springback influence under the high temperature, and element precision is high, and forming quality is good.

In the general steel plate heat forming technology; Sheet material heats 850-950 ℃ in heating furnace; And insulation makes the abundant austenitizing of sheet material a few minutes, subsequently the sheet material of red heat sent into drawing in the mould of cooling system, and the mold cools down that is had the rapid and uniform cooling system is simultaneously quenched; The steel plate tissue is transformed into uniform martensitic structure by austenite, thereby obtains the parts of superhigh intensity ratio.

Said method can obtain the superhigh intensity martensitic material, and material character is the metallic composite panel that continuous gradient distributes but can not obtain along its length, and this material is widely used in the impact-resistant energy-absorbing and the bearing structure parts of industries such as automobile, civil buildings.

Summary of the invention

For solving the problems referred to above that prior art exists, the present invention will design the thermo shaping method that a kind of material character along its length is the metallic composite panel of continuous gradient distribution.

To achieve these goals, technical scheme of the present invention is following: a kind of thermo shaping method of metallic composite panel may further comprise the steps:

A, heating: sheet material put into have the numerical control heating furnace that segmentation adds temperature function, make sheet material be divided into 550-650 ℃, 650-750 ℃, 750-850 ℃ and 900-100 ℃ of four temperature province and heat and be incubated 3 minutes by length direction;

B, cooling forming: subsequently sheet material is put into the mould with different cooling line distribution densities and carry out hot forming, described mould comprises mold and bed die.

Cooling line of the present invention distributes and is installed in mold and bed die inside respectively, and its distribution density is symmetry up and down.

The high more position of correspondence sheet material temperature, position that cooling line of the present invention distributes close more.

Compared with prior art, the present invention has following beneficial effect:

1, the present invention has obtained material character and has been particulate metal composite board that continuous gradient distributes along its length through heating-up temperature and mold cools down pipe-line layout in the control hot forming process.

2, the present invention finds that through the metallographic experiment metallic composite microstructure that obtains comprises martensite, martensite and ferrite line and staff control and ferrite and pearlite line and staff control etc.; And corresponding stretching experiment shows that the yield strength of this hot forming metallic composite can be from 300MPa to the 1000MPa continuous distributed, hot strength from 480MPa to the 1600MPa continuous distributed.

3, the present invention analyzes the impact energy absorption ability of the shape for hat thin-wall construction be made up of U type metallic composite; Find through rationally arranging the distribution of material of U type metallic composite parts; Aspect energy absorption ability, improve 58.7% than corresponding single heat-formable material, peak force can descend 23.4%.

4, the present invention has proved the feasibility of brand-new hot forming metallic composite processing technology through experiment and numerical simulation analysis, and this metallic composite is particularly suitable for the selection of the material of anti-the collision impact.

Description of drawings

5 in the total accompanying drawing of the present invention, wherein:

Fig. 1 is a U-shaped metal parts hot-forming die cooling line distribution map.

Fig. 2 is a U-shaped metal parts sketch map.

Fig. 3 is the engineering stress-strain curve of U-shaped metal parts A section.

Fig. 4 is the engineering stress-strain curve of U-shaped metal parts B section.

Fig. 5 is the engineering stress-strain curve of U-shaped metal parts C section.

Among the figure: 1, mold, 2, bed die, 3, cooling line, 4, sheet material.

The specific embodiment

Below in conjunction with accompanying drawing method of the present invention and beneficial effect are described further.Shown in Fig. 1-2, a kind of thermo shaping method of metallic composite panel may further comprise the steps:

A, heating: sheet material 4 put into have the numerical control heating furnace that segmentation adds temperature function, make sheet material 4 be divided into 550-650 ℃, 650-750 ℃, 750-850 ℃ and 900-100 ℃ of four temperature province and heat and be incubated 3 minutes by length direction;

B, cooling forming: subsequently sheet material 4 is put into the mould with different cooling lines 3 distributions and carry out hot forming, described mould comprises mold 1 and bed die 2.

Cooling line 3 of the present invention distributes and is installed in mold 1 and bed die 2 inside respectively, and its distribution density is symmetry up and down.

The position high more portion of correspondence sheet material 4 temperature that cooling line 3 of the present invention distributes close more

Below through test data beneficial effect of the present invention is described.

1, the metallic composite A after the hot forming, B, C are partly carried out the Metallographic Analysis of microstructure, metallographic structure shows: U type parts A part is converted into martensite fully, and the corresponding plate of A part complete austenitizing and the enough coolings of process are described; U type metallic element B partly is martensite and ferritic line and staff control, and the corresponding plate of B part not complete austenitizing and cooldown rate deficiency are described; U type parts C partly is ferrite and pearlitic line and staff control, explains that the corresponding plate heating of C part does not reach austenitizing temperature.The microstructure of U type parts analyzes that clear portion of hot forming technology process can obtain material character and be particulate metal composite that continuous gradient distributes along its length through control heating-up temperature and mold cools down pipe-line layout.

2, materials respectively and carry out stretching experiment in A, B, the C part of U type metallic composite, experimental result is shown in Fig. 3-5.

As can be seen from the figure the material mechanical performance at U type parts A, B, C three places is corresponding with their microstructure; Yield strength can change from 300MPa to 1000MPa continuously; Hot strength changes from 480MPa to 1600MPa continuously, is particulate metal functional composite material that continuous gradient distributes thereby proof can obtain material character through heat forming technology partly.This hot forming metallic composite technology need not interconnection techniques such as bonding, welding, riveted joint, only needs a step heat forming technology, and this not only improves the design space of material greatly but also has saved production cost greatly.

Claims (3)

1. the thermo shaping method of a metallic composite panel is characterized in that: may further comprise the steps:
A, heating: sheet material (4) put into have the numerical control heating furnace that segmentation adds temperature function, make sheet material (4) be divided into 550-650 ℃, 650-750 ℃, 750-850 ℃ and 900-100 ℃ of four temperature province and heat and be incubated (3) minute by length direction;
B, cooling forming: subsequently sheet material (4) is put into the mould with different cooling lines (3) distribution and carry out hot forming, described mould comprises mold (1) and bed die (2).
2. the thermo shaping method of a kind of metallic composite panel according to claim 1 is characterized in that: described cooling line (3) distributes and is installed in mold (1) and bed die (2) inside respectively, and its distribution density is symmetrical up and down.
3. the thermo shaping method of a kind of metallic composite panel according to claim 1 is characterized in that: the high more position of correspondence sheet material (4) temperature, position that described cooling line (3) distributes close more.
CN2011102965551A 2011-09-30 2011-09-30 Thermoforming method of metal composite board CN102389917A (en)

Priority Applications (1)

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CN2011102965551A CN102389917A (en) 2011-09-30 2011-09-30 Thermoforming method of metal composite board

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2011102965551A CN102389917A (en) 2011-09-30 2011-09-30 Thermoforming method of metal composite board

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102672054A (en) * 2012-05-30 2012-09-19 浙江吉利汽车研究院有限公司杭州分公司 Hot forming method and hot forming mould
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
CN104220186A (en) * 2012-06-27 2014-12-17 宝马股份公司 Cooled tool for hot-forming and/or press-hardening of sheet metal material and method for producing cooling device for this tool
CN105598282A (en) * 2015-12-30 2016-05-25 吉林大学 Hot forming punching device of automobile energy absorbing structure and punching method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003285120A (en) * 2002-01-22 2003-10-07 Nippon Steel Corp Residual stress reducing method and mold assembly for metal sheet product
CN201231286Y (en) * 2008-07-31 2009-05-06 钢铁研究总院 Baby fixation device for imaging department
US20100064759A1 (en) * 2008-09-18 2010-03-18 Benteler Automobiltechnik Gmbh Method and device for press-hardening a metallic formed structure
KR100951042B1 (en) * 2009-11-13 2010-04-05 현대하이스코 주식회사 Hot press forming device for promoting cooling efficiency

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003285120A (en) * 2002-01-22 2003-10-07 Nippon Steel Corp Residual stress reducing method and mold assembly for metal sheet product
CN201231286Y (en) * 2008-07-31 2009-05-06 钢铁研究总院 Baby fixation device for imaging department
US20100064759A1 (en) * 2008-09-18 2010-03-18 Benteler Automobiltechnik Gmbh Method and device for press-hardening a metallic formed structure
KR100951042B1 (en) * 2009-11-13 2010-04-05 현대하이스코 주식회사 Hot press forming device for promoting cooling efficiency

Non-Patent Citations (1)

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Title
马宁: "高强度钢板热成形技术若干研究", 《中国博士学位论文全文数据库 工程科技Ⅰ辑》 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102672054A (en) * 2012-05-30 2012-09-19 浙江吉利汽车研究院有限公司杭州分公司 Hot forming method and hot forming mould
CN102672054B (en) * 2012-05-30 2015-04-01 浙江吉利汽车研究院有限公司杭州分公司 Hot forming method and hot forming mould
CN104220186A (en) * 2012-06-27 2014-12-17 宝马股份公司 Cooled tool for hot-forming and/or press-hardening of sheet metal material and method for producing cooling device for this tool
US10081047B2 (en) 2012-06-27 2018-09-25 Bayerische Motoren Werke Aktiengesellschaft Cooled tool for hot-forming and/or press-hardening of a sheet metal material and method for producing a cooling device for this tool
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
CN105598282A (en) * 2015-12-30 2016-05-25 吉林大学 Hot forming punching device of automobile energy absorbing structure and punching method

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