CN111545670A - Hot stamping forming B column and forming process thereof - Google Patents
Hot stamping forming B column and forming process thereof Download PDFInfo
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- CN111545670A CN111545670A CN202010549464.3A CN202010549464A CN111545670A CN 111545670 A CN111545670 A CN 111545670A CN 202010549464 A CN202010549464 A CN 202010549464A CN 111545670 A CN111545670 A CN 111545670A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- 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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- 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
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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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Thermal Sciences (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Combustion & Propulsion (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The invention discloses a hot stamping forming B column, which comprises a plate, wherein the top and the bottom of the plate are respectively and integrally formed with a top mounting part and a bottom mounting part, and a first trapezoidal frame, a waist-shaped frame, a hinge, a rectangular frame and a second trapezoidal frame are sequentially arranged below the top mounting part; according to the invention, the part is effectively prevented from rebounding, the thickness of the plate is reduced while the strength of the part is greatly improved, and the lightweight effect is obvious; the cooling speed of the part is controlled by changing the flow of cooling water in the hot forming die, and the quenching heat treatment and the part forming are synchronously completed; the plate and the reinforcing ribs are connected through spot welding and then are subjected to thermal forming, so that the process is simplified, and the energy consumption is saved; the adopted sheet material is a galvanized sheet, so that oxidation can be effectively prevented in the heating process, protective gas does not need to be introduced, and surface treatment is not needed after forming; the shape of the plate is subjected to CAE forming simulation analysis in advance, no trimming margin is left after forming, laser cutting treatment is not needed, and materials are saved.
Description
Technical Field
The invention belongs to the technical field of B columns, and particularly relates to a hot stamping B column. Meanwhile, the invention also relates to a forming process for forming the B column by hot stamping.
Background
The lightweight automobile is favorable for improving the dynamic property, the comfort and the operation stability of the automobile, and the preparation quality of the automobile is reduced on the premise of ensuring the strength and the safety performance of the automobile, so that the power of the automobile is improved, the fuel consumption is reduced, the exhaust pollution is reduced, and the lightweight automobile is an important direction for the technical development of the automobile.
The use of lightweight materials and corresponding molding processes is one of the most effective ways to achieve lightweight automobiles, and high-strength steel is one of the most promising lightweight materials for automobile application prospects. Although the high-strength steel can obviously reduce the thickness of parts, the addition amount of alloy elements is large, the forming pressure is high, and the formed parts have resilience.
For example, "car B-pillar high-strength plate cold-drawing forming die and process", patent technology with patent number CN101491819A improves the springback problem of cold-stamping forming by performing, reverse drawing, trimming and punching, and shaping the R-angle and profile, and has many processes, complex die design, and low forming precision.
The hot stamping forming is that a metal plate is heated to austenitizing temperature, then the metal plate is formed in a die, and simultaneously, the metal plate is quenched by ultra-fast cooling, so that the ultra-high strength martensite structure is obtained by pressure maintaining, and the forming pressure is small and has no resilience.
For another example, "a B pillar of an automobile and a manufacturing method", patent No. CN 104443050a, discloses a B pillar obtained by thermoforming an unequal-thickness plate and a reinforced tube respectively, and then welding the two. The manufacturing method of the unequal-thickness plate is complex and has higher requirements on rolling equipment; two times of thermal forming are needed, the energy consumption is high, and the corrosion resistance is low; moreover, the reinforcing pipe is thick, and the thinning effect is not obvious.
For cold press forming of the B-pillar: cold stamping cannot be formed at one time, a pre-forming or progressive die mode is required, a plurality of sets of dies are required to be designed and developed, and the process is complex; moreover, the required molding pressure is higher and higher due to molding processing hardening of each grade, so that the problems of dark injury, cracking and the like are easy to occur; the formed part has large resilience and poor dimensional accuracy; the strength of the part is improved mainly by adding alloy elements or improving the thickness of the plate, so that the material cost and the weight of the part are increased.
For hot stamp forming of the B pillar: the non-equal thickness plate is adopted, the requirement on rolling equipment is high, and the yield is low; the B column main body and the reinforcing plate are respectively formed, so that energy consumption and working procedures are increased; the thermal forming plate material is oxidized in the heating process, protective gas needs to be introduced, and shot blasting treatment is needed after the part is formed.
Disclosure of Invention
The invention aims to provide a hot stamping B column and a forming process thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a hot stamping forming B post, includes the sheet material, the top and the bottom of sheet material integrated into one piece respectively have top installation department and end installation department, top installation department below is equipped with first trapezoidal frame, waist shape frame, hinge, rectangle frame and the trapezoidal frame of second in proper order, first screw hole has been seted up to the inside of first trapezoidal frame, waist shape groove and second screw hole have been seted up to the inside of waist shape frame, the third screw hole has been seted up on the solid fixed page or leaf on the hinge, the third screw hole has been seted up to the inside of the trapezoidal frame of second, the strengthening rib has all been welded with the bottom in sheet material top.
Preferably, the second threaded holes are at least three equidistantly arranged.
Preferably, the first trapezoid frame is wide at the top and narrow at the bottom.
Preferably, the width of the waist-shaped frame is gradually increased from top to bottom.
Preferably, the second trapezoid frame is narrow at the top and wide at the bottom.
Preferably, the plate comprises the following chemical components in percentage by weight: 0.20 to 0.225 weight percent of C, 1.05 to 1.48 weight percent of Si, 1.45 to 1.85 weight percent of Mn, 0.15 to 0.35 weight percent of Cr, less than 0.010 weight percent of P, less than 0.015 weight percent of S, less than 0.010 weight percent of N, and the balance of Fe and inevitable impurities.
Preferably, the strength of the plate stock is: sigma s is more than or equal to 1200MPa, and sigma b is more than or equal to 1600 MPa.
Preferably, the front reinforcing rib and the rear reinforcing rib are positioned on the outer sides of the first trapezoidal frame, the waist-shaped frame, the hinge, the rectangular frame and the second trapezoidal frame.
The invention also provides a forming process for forming the B column by hot stamping, which specifically comprises the following steps:
s1, welding the plate and the reinforcing ribs (14) together;
s2, putting the plate into a heating furnace through a unstacking robot;
s3, heating the plate to austenitizing temperature by steps along with a heating roller in the furnace, namely 890-960 ℃;
s4, discharging the plate from the heating furnace, and then feeding the plate into a hydraulic press die from a roller machine for punch forming;
s5, introducing cooling water into the die for rapid cooling, wherein the cooling rate is 50-100 ℃/S, and maintaining the pressure for 6-10S to obtain a lath martensite structure;
s6, after demolding, the temperature of the plate is 200-230 ℃, and the plate (1) is cooled to room temperature along with the conveyer belt in air.
Preferably, the shape of the plate is subjected to CAE forming simulation analysis in advance, no trimming margin is left after forming, and laser cutting treatment is not needed.
The hot stamping forming B column and the forming process thereof provided by the invention have the beneficial effects that:
according to the invention, the part is effectively prevented from rebounding, the thickness of the plate is reduced while the strength of the part is greatly improved, and the lightweight effect is obvious; the cooling speed of the part is controlled by changing the flow of cooling water in the hot forming die, and the quenching heat treatment and the part forming are synchronously completed; the plate and the reinforcing ribs are connected through spot welding and then are subjected to thermal forming, so that the process is simplified, and the energy consumption is saved; the adopted sheet material is a galvanized sheet, so that oxidation can be effectively prevented in the heating process, protective gas does not need to be introduced, and surface treatment is not needed after forming; the shape of the plate is subjected to CAE forming simulation analysis in advance, no trimming margin is left after forming, laser cutting treatment is not needed, and materials are saved.
Drawings
FIG. 1 is a heat treatment process diagram of a hot stamping B-pillar;
FIG. 2 is a flow chart of a forming process for hot stamping a B-pillar;
FIG. 3 is a view showing the structure of a part of a hot stamping B-pillar;
FIG. 4 is a scanning electron microscope image of the metallographic structure of a hot stamping B-pillar;
FIG. 5 is a transmission electron microscope image of the metallographic structure of a hot stamping B-pillar.
In the figure: 1. a plate material; 2. a top mounting portion; 3. a bottom mounting portion; 4. a first ladder frame; 5. a first threaded hole; 6. a waist-shaped frame; 7. a kidney-shaped groove; 8. a second threaded hole; 9. a hinge; 10. a third threaded hole; 11. a rectangular frame; 12. a second ladder frame; 13. a third threaded hole; 14. and (5) reinforcing ribs.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention provides a hot stamping forming B column as shown in figures 1-5, which comprises a plate material 1, wherein the strength of the plate material 1 is as follows: the sigma s is more than or equal to 1200MPa, the sigma b is more than or equal to 1600MPa, and the chemical components and the content of the plate 1 are as follows: 0.20 to 0.225 weight percent of C, 1.05 to 1.48 weight percent of Si, 1.45 to 1.85 weight percent of Mn, 0.15 to 0.35 weight percent of Cr, less than 0.010 weight percent of P, less than 0.015 weight percent of S, less than 0.010 weight percent of N, and the balance of Fe and inevitable impurities;
the top and the bottom of the plate 1 are respectively integrally formed with a top mounting part 2 and a bottom mounting part 3, and a first trapezoidal frame 4, a waist-shaped frame 6, a hinge 9, a rectangular frame 11 and a second trapezoidal frame 12 are sequentially arranged below the top mounting part 2;
the first trapezoid frame 4 is arranged to be wide at the top and narrow at the bottom, the width of the waist-shaped frame 6 is gradually increased from top to bottom, and the second trapezoid frame 12 is arranged to be narrow at the top and wide at the bottom;
a first threaded hole 5 is formed in the first trapezoid frame 4, a kidney-shaped groove 7 and second threaded holes 8 are formed in the kidney-shaped frame 6, at least three second threaded holes 8 are arranged at equal intervals, a third threaded hole 10 is formed in a fixed page on the hinge 9, a third threaded hole 13 is formed in the second trapezoid frame 12, reinforcing ribs 14 are welded to the top and the bottom of the plate material 1, and the front reinforcing rib 14 and the rear reinforcing rib 14 are located on the outer sides of the first trapezoid frame 4, the kidney-shaped frame 6, the hinge 9, the rectangular frame 11 and the second trapezoid frame 12;
the invention also provides a forming process for forming the B column by hot stamping, which specifically comprises the following steps:
s1, welding the plate 1 and the reinforcing ribs 14 together;
s2, putting the plate 1 into a heating furnace through a unstacking robot;
s3, heating the plate 1 to an austenitizing temperature along with an in-furnace heating roller in a stepping manner, namely 890-960 ℃;
s4, discharging the plate 1 from the heating furnace, and then feeding the plate into a hydraulic press die from a roller machine for punch forming;
s5, introducing cooling water into the die for rapid cooling, wherein the cooling rate is 50-100 ℃/S, and maintaining the pressure for 6-10S to obtain a lath martensite structure;
s6, after demolding, the temperature of the plate 1 is 200-230 ℃, and the plate 1 is cooled to room temperature along with the conveyer belt.
The present invention has:
1) according to the invention, the B column adopts a hot stamping forming process, the plate 1 is softened after being heated, the forming pressure is small, the die and the hydraulic machine are not easy to wear, and the service life of equipment is prolonged;
2) the production rhythm is fast and stable, 6-10PCS parts are produced every minute, and the production process is suitable for large-scale production;
3) the production plate 1 is a galvanized plate, oxidation is effectively prevented in the heating process, protective gas is prevented from being introduced, surface treatment is not needed for the formed part, and the energy is saved and the environment is protected;
4) the components of the plate 1 are mainly low-cost C, Si and Mn elements, and micro-alloy elements are not required to be added, so that the production cost is reduced;
5) the part is effectively prevented from rebounding, the strength of the part is greatly improved, meanwhile, the thickness of the plate is reduced, the thickness of the plate is 1.0-1.1mm, and the lightweight effect is obvious;
6) the part is formed in a die and rapidly cooled to obtain a lath martensite structure with extremely high strength, as shown in fig. 4 and 5, the thickness is about 0.4 mu m, and the strength of the plate material 1 before forming is as follows: sigma s is more than or equal to 300MPa, sigma b is more than or equal to 600MPa, and the strength of the formed plate 1 is as follows: the sigma s is more than or equal to 1200MPa, the sigma b is more than or equal to 1600MPa, the strength is obviously improved, the impact and collision resisting effect is good, the safety of the vehicle body is improved, and drivers and passengers are better protected;
7) the plate 1 and the reinforcing ribs 14 are connected through spot welding and then are subjected to thermal forming, so that the process is simplified, the precision is improved, and the energy consumption is saved;
8) the shape of the plate 1 is subjected to CAE forming simulation analysis in advance, no trimming margin is left after forming, laser cutting treatment is not needed, and materials are saved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The utility model provides a hot stamping forming B post, includes sheet material (1), its characterized in that: the top and the bottom of sheet material (1) are integrated into one piece respectively and have top installation department (2) and end installation department (3), top installation department (2) below is equipped with first trapezoidal frame (4), waist shape frame (6), hinge (9), rectangle frame (11) and the trapezoidal frame of second (12) in proper order, first screw hole (5) have been seted up to the inside of first trapezoidal frame (4), waist shape groove (7) and second screw hole (8) have been seted up to the inside of waist shape frame (6), third screw hole (10) have been seted up on hinge (9) the solid fixed page or leaf, third screw hole (13) have been seted up to the inside of the trapezoidal frame of second (12), strengthening rib (14) have all been welded with the bottom in sheet material (1) top.
2. A hot stamp-formed B-pillar as defined in claim 1, wherein: the second threaded holes (8) are at least three in equal distance.
3. The method of claim 1, wherein the step of hot stamping the B-pillar comprises: the first trapezoid frame (4) is wide at the top and narrow at the bottom.
4. A hot stamp-formed B-pillar as defined in claim 1, wherein: the width of waist shape frame (6) is crescent from top to bottom.
5. A hot stamp-formed B-pillar as defined in claim 1, wherein: the second trapezoid frame (12) is arranged in a manner that the upper part is narrow and the lower part is wide.
6. A hot stamp-formed B-pillar as defined in claim 1, wherein: the plate material (1) comprises the following chemical components in percentage by weight: 0.20 to 0.225 weight percent of C, 1.05 to 1.48 weight percent of Si, 1.45 to 1.85 weight percent of Mn, 0.15 to 0.35 weight percent of Cr, less than 0.010 weight percent of P, less than 0.015 weight percent of S, less than 0.010 weight percent of N, and the balance of Fe and inevitable impurities.
7. A hot stamp-formed B-pillar as defined in claim 1, wherein: the strength of the plate (1) is as follows: sigma s is more than or equal to 1200MPa, and sigma b is more than or equal to 1600 MPa.
8. The hot stamp formed B-pillar as in claim 7, wherein: the front reinforcing rib and the rear reinforcing rib (14) are positioned on the outer sides of the first trapezoidal frame (4), the waist-shaped frame (6), the hinge (9), the rectangular frame (11) and the second trapezoidal frame (12).
9. The forming process for hot stamping forming of the B pillar according to claim 1, wherein: the method specifically comprises the following steps:
s1, welding the plate (1) and the reinforcing ribs (14) together;
s2, putting the plate (1) into a heating furnace through a unstacking robot;
s3, heating the plate (1) to an austenitizing temperature along with an in-furnace heating roller in a stepping manner, namely 890-960 ℃;
s4, discharging the plate 1 from the heating furnace, and then feeding the plate into a hydraulic press die from a roller machine for punch forming;
s5, introducing cooling water into the die for rapid cooling, wherein the cooling rate is 50-100 ℃/S, and maintaining the pressure for 6-10S to obtain a lath martensite structure;
s6, after demolding, the temperature of the plate (1) is 200-230 ℃, and the plate (1) is cooled to room temperature along with the conveyer belt in air.
10. The forming process of hot stamping forming of the B pillar as claimed in claim 9, wherein: the shape of the plate (1) is subjected to CAE (computer aided engineering) forming simulation analysis in advance, no trimming allowance is left after forming, and laser cutting treatment is not needed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010549464.3A CN111545670A (en) | 2020-06-16 | 2020-06-16 | Hot stamping forming B column and forming process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010549464.3A CN111545670A (en) | 2020-06-16 | 2020-06-16 | Hot stamping forming B column and forming process thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114952185A (en) * | 2022-04-22 | 2022-08-30 | 一汽解放汽车有限公司 | Forming method of side wall reinforcement |
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| CN209888936U (en) * | 2019-05-21 | 2020-01-03 | 东风小康汽车有限公司重庆分公司 | B-pillar inner reinforcing plate |
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| DE102009047951A1 (en) * | 2009-10-01 | 2011-04-07 | Daimler Ag | Column i.e. B-column, for hybrid motor vehicle i.e. passenger car, has outer shell made of aluminum-based alloy and connected with inner shell, and reinforcing part made of aluminum-based alloy and connected with outer wall of outer shell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114952185A (en) * | 2022-04-22 | 2022-08-30 | 一汽解放汽车有限公司 | Forming method of side wall reinforcement |
| CN114952185B (en) * | 2022-04-22 | 2024-06-04 | 一汽解放汽车有限公司 | Forming method of side wall reinforcement |
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