CN104627245A - Column B and manufacturing method - Google Patents
Column B and manufacturing method Download PDFInfo
- Publication number
- CN104627245A CN104627245A CN201410783414.6A CN201410783414A CN104627245A CN 104627245 A CN104627245 A CN 104627245A CN 201410783414 A CN201410783414 A CN 201410783414A CN 104627245 A CN104627245 A CN 104627245A
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- Prior art keywords
- main body
- post
- post main
- height
- column
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention relates to a column B and a manufacturing method. The column B comprises a column B body. The top of the column B body is provided with an upper fixing part which is fixed on a car roof, and the bottom of the column B body is provided with a lower fixing part which is fixed on a door threshold. The column B is characterized in that the upper portion of the column B body is a hard area part, the middle and lower portion of the column B body is a soft area part, and a transition area is arranged between the hard area part and the soft area part. A reinforced tube is arranged in the soft area part. The height of the transition area is about 50 mm. The height of the hard area part is a third to a quarter the height of the column B body. The hard area part is obtained through an ultra-high strength steel heat forming technology, and is of a martensitic structure with the strength ranging from 1300 MPa to 1500 MPa. The soft area part is of a ferrite and pearlitic structure or a bainite structure with the strength ranging from 500 MPa to 700MPa, and the soft area part is obtained by slow cooling through the ultra-strength steel heat forming technology. The reinforced tube is a hollow tube, and is obtained through a hydro-forming technology. The design on the cross section of the reinforced tube can be flexibly changed according to the shape of the column B, so that the load on each cross section is more even.
Description
Technical field
The present invention relates to a kind of B post and manufacture method, belong to vehicle part technical field.
Background technology
The B post of automobile is the vertical beam on automobile, between the front stall and back seat of driving compartment, extends to bottom car from roof.B post is supported cart top cover not only, also will bear the supporting power of forward and backward car door, B post is also wanted some additional components of device, the safety strap of such as dress circle, sometimes also will wear electric wire wire harness.Therefore B post mostly has external convex radius, transmits performance to ensure good power.The B column section shape of Modern Car is more complicated, and it is welded by more than one piece stamping steel plate.Along with the development of auto manufacturing technology, need not weld and directly adopt the closed section center pillar of shaped by fluid pressure to come out, its rigidity improves greatly and weight significantly reduces, and is conducive to the lightweight of Modern Car.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of B post and manufacture method are provided, adopt the reinforced pipe of hydraulic forming, the Cross section Design of reinforced pipe can be changed according to B post shapes flexibly, make the load of each cross section more even, and meet vehicle lightweight requirements.
According to technical scheme provided by the invention, described B post, comprises B post main body, and B post body top is the upper fixed part fixing with roof, and B post bottom part body is the lower fixed part fixing with threshold; It is characterized in that: the top of described B post main body is hard area part, middle part and bottom are soft district part, and be transition region between hard area part and soft district part, in soft district, part arranges reinforced pipe; The height of described transition region is about 50mm, and the height of hard area part accounts for 1/3 ~ 1/4 of B post body height; Described hard area part is obtained by ultra-high-tensile steel heat forming technology, and intensity is the martensitic stucture of 1300 ~ 1500MPa; Described soft district part is in ultra-high-tensile steel heat forming technology, by cooling at a slow speed ferrite and pearlite tissue that the intensity obtained is 500 ~ 700MPa or being bainite structure; Described reinforced pipe is hollow tube, is obtained by hydroforming process.
The thickness of pipe of described reinforced pipe is 1.8mm ± 30%.
The manufacture method of described B post, is characterized in that, comprise the following steps:
(1) blank of B post main body is heated to 850 ~ 940 DEG C in heating furnace, makes it be converted into austenite structure, the blank of described B post main body adopts 22MnB5(to be commonly called as boron steel);
(2) blank of the B post main body after austenitizing is carried out Heat forming in mould, and quench simultaneously; Soft district part is incubated, and obtains ferrite and pearlite tissue or bainite structure through cooling at a slow speed; Wherein, the height of hard area part accounts for 1/3 ~ 1/4 of B post body height, is transition region between hard area part and soft district part, and the height of transition region is other parts of about 50mm, B post main body is soft district part;
(3) straight tube is carried out bend pipe at normal temperatures, and preforming is able to the part basically identical with reinforced pipe net shape; The material of described straight tube is micro alloyed steel, dual phase steel or multi-phase Steels;
(4) part after step (3) preforming is carried out hydraulic forming by compression machine in a mold, detailed process is: mould is closed under compression machine drives, the water system of compression machine carries out water filling to the inner chamber of the tubular member after preform, makes the inner chamber of part be full of water; Axial cylinder moves to part and is sealed by part, and inject high pressure water to inner cavity of component, under the effect of high pressure water, workpiece deformation, until fit with the forming surface of mould, obtains the shape of required reinforced pipe simultaneously; The internal pressure of described high pressure water is 5 ~ 250MPa, and axial cylinder thrust is 5 ~ 100 tons;
(5) the reinforced pipe weld together that B post main body step (2) Heat forming obtained and step (4) hydraulic forming obtain, obtains described B post.
The present invention has the following advantages: (1) reinforced pipe adopts Hydroform process, and have weight-saving advantage, namely the intensity of product is higher, and weight is light all the better; (2) stress is concentrated little: relative to conventional ones technique, i.e. the technique that punching press two panels part is welded together again, uses Hydroform process according to the flexible varied cross section design of the situation of B post main body, to make the load in each cross section more even; (3) size quality is higher: because when Hydroform process is shaped, internal pressure is very high, workpiece plastic deformation process compressive stress state, and non-traditional from the drawing of Sheet Metal Forming Technology, press two kinds of state ofs stress, so more easily produce part resilience, the dimensional accuracy of part is thus higher; (4) soft district, B post bottom intensity is weak, and stretch ratio is high, can reach distortion energy-absorbing object, can better protect driver and crew's head during collision.
Accompanying drawing explanation
Fig. 1 is the structural representation of B post of the present invention.
Fig. 2 is the schematic diagram of institute's reinforced pipe.
Detailed description of the invention
Below in conjunction with concrete accompanying drawing, the invention will be further described.
As shown in Fig. 1 ~ Fig. 2: as described in B post comprise upper fixed part 1, lower fixed part 2, B post main body 3, hard area part 4, soft district part 5, transition region 6, reinforced pipe 7 etc.
As shown in Figure 1 and Figure 2, the present invention includes B post main body 3, B post main body 3 top is bottom upper fixed part 1, the B post main body 3 fixing with roof be the lower fixed part 2 fixed with threshold; The top of described B post main body 3 is hard area part 4, and middle part and bottom are soft district part 5, and hard area part 4 and soft district part 5 are transition region 6, and soft district part 4 arranges reinforced pipe 7; Described hard area part 4 is obtained by ultra-high-tensile steel heat forming technology, and intensity is the martensitic stucture of 1300 ~ 1500MPa; Described soft district part 5 is in ultra-high-tensile steel heat forming technology, by cooling at a slow speed ferrite and pearlite tissue that the intensity obtained is 500 ~ 700MPa or being bainite structure; Described reinforced pipe 7 is hollow tube, is obtained by hydroforming process;
The height of described transition region 6 is about 50mm; The height of described hard area part 5 accounts for 1/3 ~ 1/4 of B post main body 3 height;
The thickness of pipe of described reinforced pipe 7 is 1.8mm ± 30%.
The manufacture method of described B post, comprises the following steps:
(1) blank of B post main body is heated to 850 ~ 940 DEG C in heating furnace, makes it be converted into austenite structure, the blank of described B post main body adopts 22MnB5(to be commonly called as boron steel);
(2) blank of the B post main body after austenitizing is carried out Heat forming in mould, and quench simultaneously; Soft district part is incubated, and obtains ferrite and pearlite tissue or bainite structure through cooling at a slow speed; Wherein, the height of hard area part 5 accounts for 1/3 ~ 1/4 of B post main body 3 height, and the height of transition region 6 is other parts of about 50mm, B post main body is soft district part;
(3) selection material is the straight tube of dead-soft steel, corrosion-resistant steel, aluminium, aluminum magnesium alloy, straight tube is carried out bend pipe at normal temperatures, and preforming is able to the part basically identical with reinforced pipe net shape; The material of described straight tube is micro alloyed steel (as SM355MC), dual phase steel (as DP800) or multi-phase Steels;
(4) part after step (3) preforming is carried out hydraulic forming by compression machine in a mold, detailed process is: mould is closed under compression machine drives, the water system of compression machine carries out water filling to the inner chamber of the tubular member after preform, makes the inner chamber of part be full of water; Axial cylinder moves to part and is sealed by part, and inject high pressure water to inner cavity of component, under the effect of high pressure water, workpiece deformation, until fit with the forming surface of mould, obtains the shape of required reinforced pipe simultaneously; The internal pressure of described high pressure water is 5 ~ 250MPa, and axial cylinder thrust is 5 ~ 100 tons;
(5) the reinforced pipe weld together that B post main body step (2) Heat forming obtained and step (4) hydraulic forming obtain, obtains described B post.
Claims (3)
1. a B post, comprises B post main body (3), and B post main body (3) top is the upper fixed part (1) fixing with roof, and B post main body (3) bottom is the lower fixed part (2) fixing with threshold; It is characterized in that: the top of described B post main body (3) is hard area part (4), and middle part and bottom are soft district part (5), is transition region (6), arranges reinforced pipe (7) in soft district part (4) between hard area part (4) and soft district part (5); The height of described transition region (6) is about 50mm, and the height of hard area part (5) accounts for 1/3 ~ 1/4 of B post main body (3) height; Described hard area part (4) is obtained by ultra-high-tensile steel heat forming technology, and intensity is the martensitic stucture of 1300 ~ 1500MPa; Described soft district part (5) is in ultra-high-tensile steel heat forming technology, by cooling at a slow speed ferrite and pearlite tissue that the intensity obtained is 500 ~ 700MPa or being bainite structure; Described reinforced pipe (7) is hollow tube, is obtained by hydroforming process.
2. B post as claimed in claim 1, is characterized in that: the thickness of pipe of described reinforced pipe (7) is 1.8mm ± 30%.
3. a manufacture method for B post, is characterized in that, comprises the following steps:
(1) blank of B post main body is heated to 850 ~ 940 DEG C in heating furnace, makes it be converted into austenite structure, the blank of described B post main body adopts 22MnB5(to be commonly called as boron steel);
(2) blank of the B post main body after austenitizing is carried out Heat forming in mould, and quench simultaneously; Soft district part is incubated, and obtains ferrite and pearlite tissue or bainite structure through cooling at a slow speed; Wherein, the height of hard area part (5) accounts for 1/3 ~ 1/4 of B post main body (3) height, is transition region (6) between hard area part (5) and soft district part (4), and the height of transition region (6) is other parts of about 50mm, B post main body is soft district part;
(3) straight tube is carried out bend pipe at normal temperatures, and preforming is able to the part basically identical with reinforced pipe net shape; The material of described straight tube is micro alloyed steel, dual phase steel or multi-phase Steels;
(4) part after step (3) preforming is carried out hydraulic forming by compression machine in a mold, detailed process is: mould is closed under compression machine drives, the water system of compression machine carries out water filling to the inner chamber of the tubular member after preform, makes the inner chamber of part be full of water; Axial cylinder moves to part and is sealed by part, and inject high pressure water to inner cavity of component, under the effect of high pressure water, workpiece deformation, until fit with the forming surface of mould, obtains the shape of required reinforced pipe simultaneously; The internal pressure of described high pressure water is 5 ~ 250MPa, and axial cylinder thrust is 5 ~ 100 tons;
(5) the reinforced pipe weld together that B post main body step (2) Heat forming obtained and step (4) hydraulic forming obtain, obtains described B post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783414.6A CN104627245A (en) | 2014-12-17 | 2014-12-17 | Column B and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410783414.6A CN104627245A (en) | 2014-12-17 | 2014-12-17 | Column B and manufacturing method |
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| Publication Number | Publication Date |
|---|---|
| CN104627245A true CN104627245A (en) | 2015-05-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410783414.6A Pending CN104627245A (en) | 2014-12-17 | 2014-12-17 | Column B and manufacturing method |
Country Status (1)
| Country | Link |
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| CN (1) | CN104627245A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107848008A (en) * | 2015-07-20 | 2018-03-27 | 麦格纳国际公司 | Superhigh intensity car body component and vehicle chassis component |
| CN108995716A (en) * | 2018-08-03 | 2018-12-14 | 武汉理工大学 | A kind of automobile intensity adjustable B-pillar structure |
| CN111918729A (en) * | 2018-03-30 | 2020-11-10 | 马自达汽车株式会社 | Hot press working method and working apparatus |
Citations (6)
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| CN101132938A (en) * | 2005-03-02 | 2008-02-27 | 住友金属工业株式会社 | Member for reinforcing vehicle body |
| CN101219451A (en) * | 2008-01-25 | 2008-07-16 | 哈尔滨工业大学 | Method for forming long tube part with partial convexity |
| US20090250967A1 (en) * | 2006-08-25 | 2009-10-08 | Hans Bodin | Method of hot-stamping and hardening an object from a metal sheet, and a b-pillar for a vehicle |
| JP2009274590A (en) * | 2008-05-14 | 2009-11-26 | Nippon Steel Corp | Center pillar reinforcing member and its manufacturing method |
| CN101767140A (en) * | 2010-01-06 | 2010-07-07 | 哈尔滨理工大学 | Device and method for internal pressure forming of reducer pipes |
| CN101861265A (en) * | 2007-11-15 | 2010-10-13 | 耶斯塔姆普硬技术股份公司 | A B-pillar for a vehicle |
-
2014
- 2014-12-17 CN CN201410783414.6A patent/CN104627245A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101132938A (en) * | 2005-03-02 | 2008-02-27 | 住友金属工业株式会社 | Member for reinforcing vehicle body |
| US20090250967A1 (en) * | 2006-08-25 | 2009-10-08 | Hans Bodin | Method of hot-stamping and hardening an object from a metal sheet, and a b-pillar for a vehicle |
| CN101861265A (en) * | 2007-11-15 | 2010-10-13 | 耶斯塔姆普硬技术股份公司 | A B-pillar for a vehicle |
| CN101219451A (en) * | 2008-01-25 | 2008-07-16 | 哈尔滨工业大学 | Method for forming long tube part with partial convexity |
| JP2009274590A (en) * | 2008-05-14 | 2009-11-26 | Nippon Steel Corp | Center pillar reinforcing member and its manufacturing method |
| CN101767140A (en) * | 2010-01-06 | 2010-07-07 | 哈尔滨理工大学 | Device and method for internal pressure forming of reducer pipes |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107848008A (en) * | 2015-07-20 | 2018-03-27 | 麦格纳国际公司 | Superhigh intensity car body component and vehicle chassis component |
| CN111918729A (en) * | 2018-03-30 | 2020-11-10 | 马自达汽车株式会社 | Hot press working method and working apparatus |
| CN108995716A (en) * | 2018-08-03 | 2018-12-14 | 武汉理工大学 | A kind of automobile intensity adjustable B-pillar structure |
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Application publication date: 20150520 |
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