CN112059548B - Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle - Google Patents
Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle Download PDFInfo
- Publication number
- CN112059548B CN112059548B CN202010889392.7A CN202010889392A CN112059548B CN 112059548 B CN112059548 B CN 112059548B CN 202010889392 A CN202010889392 A CN 202010889392A CN 112059548 B CN112059548 B CN 112059548B
- Authority
- CN
- China
- Prior art keywords
- front lower
- welding
- lower protective
- commercial vehicle
- lower protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 230000001681 protective effect Effects 0.000 claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 25
- 239000010959 steel Substances 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000003466 welding Methods 0.000 claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 13
- 230000000171 quenching effect Effects 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims abstract description 10
- 239000000498 cooling water Substances 0.000 claims abstract description 9
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 7
- 230000003014 reinforcing effect Effects 0.000 claims description 7
- 238000005096 rolling process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 238000004321 preservation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a manufacturing process for front lower protection of an ultrahigh-strength commercial vehicle. It comprises the following steps: firstly, dividing a front lower protective beam into two halves, respectively cold-stamping and forming by adopting hot-formed steel, and then welding to form a hot-formed steel section; welding a left connecting bracket and a right connecting bracket on the cross beam profile; a supporting clamp is additionally arranged between the two connecting brackets; placing the front lower protective welding assembly part into a heating furnace, heating to 880-930 ℃, and keeping for 5-7 min for uniform austenitizing; transferring the heated front lower protective part into a cooling water tank from a heating furnace within 10s, wherein the temperature of the part before quenching is not lower than 650 ℃, the part is quenched and cooled by cooling water and taken out after reaching the normal temperature, and the cooling rate is more than 100 ℃/s to ensure complete martensite; and separating the supporting clamp from the assembly part to obtain the assembly part. The invention improves the collision performance, reduces the weight and reduces the cost.
Description
Technical Field
The invention belongs to the technical field of front lower protection of automobiles, and particularly relates to a manufacturing process of front lower protection of an ultrahigh-strength commercial vehicle.
Background
The existing front lower protective structure generally has the defects of heavy weight, high cost and poor impact resistance, so that the vehicle oil consumption is high, the vehicle purchasing cost and the use cost of a user are high, and the section bar adopting the traditional high-strength steel cannot meet the requirement of light weight.
At present, the lower protective beam structure is mostly a rectangular tubular structure, two ends of the lower protective beam structure are bent according to the curve of the lower part of the whole vehicle, and a preparation process of rolling and integral forming is generally adopted. The conventional rolling technology is adopted for complex high-strength pipes, so that the inner wall of a bending transition part is easy to wrinkle, the outer wall of the bending transition part is easy to crack, the resilience is large, and the formed lower protection cross beam does not meet the product requirement.
The invention discloses a preparation process of an ultrahigh-strength vehicle frame section, which is disclosed by the invention patent with the publication number of CN111203686A and the publication date of 2020, 5 and 29, and although the invention can obtain the ultrahigh-strength frame section and control deformation, the invention still has the following defects: 1. the method has long heat preservation time and low production efficiency; 2. the supporting steel section is difficult to take out after being embedded, and the difficulty of batch production is high; 3. if the support is welded on the cross beam with the obtained martensite structure, the martensite grains at the welding seam are tempered into a ferrite structure, and the strength of the welding seam is greatly reduced, so that the problem that the ultra-high strength steel is difficult to weld on the rolled section is not solved.
The invention discloses a lightweight commercial vehicle front lower protective crossbeam based on a high-strength plate, which is disclosed by the invention patent with the publication number of CN209700590U and the publication date of 2019, 11 and 29, and has the following defects: 1. the DP980 adopted cold stamping or rolling forming is difficult, the resilience is large, and the part forming qualification rate and the size precision are not easy to control; 2. the maximum light weight effect is achieved without using materials of higher strength grade.
Disclosure of Invention
The invention aims to overcome the defects of a rectangular tubular structure of a lower protection crossbeam in the prior art in the processing process and provide a manufacturing process of an ultra-high strength commercial vehicle front lower protection.
The technical scheme adopted by the invention is as follows: the utility model provides a manufacturing process of protection under super high strength commercial car, preceding protection assembly includes down protects the crossbeam and fixes two supports that are used for connecting the preceding lower part of automobile body on protecting the crossbeam under and under, and the technology includes following step:
(1) firstly, dividing the front lower protective beam into two halves, respectively cold-stamping and forming by adopting hot-formed steel, and then welding to form a hot-formed steel section;
(2) welding a left connecting bracket and a right connecting bracket on the cross beam profile;
(3) in order to control the deformation of the connecting supports, a supporting clamp is additionally arranged between the two connecting supports;
(4) placing the front lower protective welding assembly part into a heating furnace to be heated to 880-930 ℃, and keeping the temperature for 5-7 min to perform uniform austenitizing;
(5) transferring the heated front lower protective part into a cooling water tank from a heating furnace within 10s, wherein the temperature of the part before quenching is not lower than 650 ℃, the part is quenched and cooled by cooling water and taken out after reaching normal temperature, and the cooling rate is more than 100 ℃/s to ensure complete martensite;
(6) and separating the supporting clamp from the assembly part to obtain the assembly part.
Furthermore, axial reinforcing grooves are respectively formed in the front side steel plate and the rear side steel plate of the lower protective cross beam.
Further, the front lower protection assembly is made of a hot forming steel material 22MnB 5.
Further, the clamp material is heat-resistant steel Cr25Ni 20.
The preparation process of the invention adopts the supporting clamp made of heat-resistant steel, and can avoid the distortion, the springback and the weld cracking of the connecting bracket in the cooling process, thereby preparing the front lower protective assembly part of the commercial vehicle meeting the requirement of dimensional precision.
The light weight of the commercial vehicle is a market trend and is an important index for showing the vehicle type competitiveness of the commercial vehicle. Under the mandatory regulation of load limitation, the current weight reduction of 100kg can bring 3000-. Compared with the prior art and equipment, the invention has the beneficial effects that:
1. due to the limitation of structural forms of a chassis and a front part of a vehicle of a heavy commercial vehicle, the cross section of a beam of a traditional front lower guard is mostly in a rectangular tubular structure, the material of the cross section is mainly Q235, DL510, QSTE700, DP980 and other profiles with the strength not exceeding 1000MPa, and the manufacturing process is generally formed integrally by rolling. The structural design and the manufacturing process of the front lower protection beam overcome the technical difficulties of insufficient rigidity, high manufacturing process difficulty, high cost and the like after the replacement of materials, so that the collision performance of the front lower protection after the light weight is not lower than or even exceeds the performance of the original part, the manufacturing process cost is lower than the process cost of the original part, and the front lower protection beam can be popularized and applied to safety parts with the requirement on collision resistance.
2. The original front lower protective cross beam replaced by the invention is of a rectangular structure with 120 x 110 x 3 x 2102mm, the cross beam reinforcing plate material is DL510 with the thickness of 5mm, and the connecting bracket is made of DL750 material with the thickness of 3 mm; the rear cross beam of the front lower protective structure is a reinforced rigid structure with the thickness of 120 x 80 x 2.3 x 2102mm, the cross beam reinforcing plate is made of hot forming steel materials with the thickness of 3mm, the connecting support is made of hot forming steel materials with the thickness of 2.3mm, the total weight is reduced by 9kg, the weight is reduced by more than 20%, and the expected light weight effect is achieved.
3. The theoretical strength of the light weight front lower protection is analyzed by adopting CAE, and the strength of the light weight front lower protection is verified by a bench test, so that the light weight front lower protection meets the national mandatory standard requirement of GB 26511-2011 requirement for front lower protection of commercial vehicles; the invention protects the single part before heat treatment of the ultrahigh strength, reduces the manufacturing cost of the single part by 30 yuan, and has the cost reduction performance of 300 ten thousand yuan/year according to the calculation of 10 ten thousand annual output.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the beam of the present invention;
FIG. 3 is a flow chart of a manufacturing process of the present invention;
fig. 4 is a schematic structural view of the quenching jig of the present invention.
Detailed Description
The invention will be further described in detail with reference to the following drawings and specific examples, which are not intended to limit the invention, but are for clear understanding.
As shown in fig. 1, the front lower protection assembly of the invention comprises a lower protection beam 1 and two supports 2, wherein the lower protection beam 1 is fixed at the front lower part of a vehicle body, and the two supports 2 are symmetrically arranged on the lower protection beam from left to right, as shown in fig. 1; when the lightweight structure design is carried out on the front lower protective assembly, the rigidity of the connecting bracket meets the requirement, the connecting bracket is kept unchanged, namely the total arrangement is not changed, the lightweight design is only carried out on the front lower protective beam structure, and the front side steel plate 3 and the rear side steel plate 3 of the lower protective beam 1 are respectively provided with the axial reinforcing grooves 4, as shown in fig. 2. Through the structural optimization of the front lower protective beam, the section coefficient of the product is increased, and the rigidity of the product is improved, so that the requirement of further thinning under the condition of not reducing the rigidity is met, and the lightweight effect is realized to the greatest extent.
The front lower protection assembly of the light commercial vehicle adopts a hot forming steel material with the mark of 22MnB5, and the material has excellent anti-collision performance and is widely applied to passenger vehicles. The tensile strength of the hot formed steel before heating is about 500-700 MPa, the strength is equivalent to that of conventional steel such as DL510, and the cold stamping or rolling forming is easy; the strength of the section bar obtained after the preparation process of the invention can reach 1300 MPa-1600 MPa.
Referring to fig. 3, the manufacturing process includes the steps of:
example 1:
the first step is as follows: the beam is prepared by adopting a hot forming steel material, firstly cold stamping to form a half body structure of the beam, and then passing CO2The gas shielded welding mode welds the two half-body structures of the beam into an integral beam structure;
secondly, welding a bracket, namely stamping the cross beam reinforcing plate into a U-shaped structure, welding the U-shaped structure to a position corresponding to the cross beam, and welding a left welded connecting bracket assembly and a right welded connecting bracket assembly to the central position of the cross beam reinforcing plate to obtain a front lower protection assembly part;
thirdly, installing a clamp, installing a quenching supporting clamp (shown in figure 4) between the left connecting bracket and the right connecting bracket, and fixing the quenching supporting clamp and the hole position at the upper end of the bracket through the clamping groove;
fourthly, heating and cooling, namely putting the front lower protection welding assembly part into a box type heating furnace with the internal temperature of 880 ℃ for heat preservation for 7 minutes to carry out uniform austenitizing, then transferring the heated front lower protection part into a cooling water tank from the heating furnace within 8s, wherein the temperature of the part before quenching is not lower than 650 ℃, the temperature of the part is reduced to 120-180 ℃, and the quenching and cooling speed is higher than 100 ℃ per second, so that complete martensite is ensured;
and fifthly, disassembling the clamp, and separating the quenching supporting clamp from the assembly part to obtain the front lower protective part of the design.
Example 2:
example 2 is basically the same as example 1 except that:
the fourth step: heating and cooling, namely putting the front lower protective welding assembly part into a box-type heating furnace with the internal temperature of 910 ℃ for heat preservation for 6 minutes to perform uniform austenitizing, then transferring the heated front lower protective part into a cooling water tank from the heating furnace within 10 seconds, wherein the temperature of the part before quenching is not lower than 650 ℃, the temperature of the part is reduced to 120-180 ℃, and the quenching and cooling speed is higher than 100 ℃ per second, so that complete martensite is ensured.
Example 3:
example 3 is basically the same as example 1 except that:
the fourth step: heating and cooling, namely putting the front lower protective welding assembly part into a box-type heating furnace with the internal temperature of 930 ℃ for heat preservation for 5 minutes to perform uniform austenitizing, then transferring the heated front lower protective part into a cooling water tank from the heating furnace within 12 seconds, wherein the temperature of the part before quenching is not lower than 650 ℃, the temperature of the part is reduced to 120-180 ℃, and the quenching and cooling speed is higher than 100 ℃ per second, so that complete martensite is ensured.
Those not described in detail in this specification are within the skill of the art.
Claims (3)
1. A manufacturing process for front lower protection of an ultrahigh-strength commercial vehicle is characterized by comprising the following steps of: the front lower protection assembly comprises a lower protection beam and two supports which are fixed on the lower protection beam and used for connecting the front lower part of the vehicle body, and the process comprises the following steps:
(1) firstly, dividing the front lower protective beam into two halves, respectively cold-stamping and forming by adopting hot-formed steel, and then welding to form a hot-formed steel section;
(2) welding a left connecting bracket and a right connecting bracket on the cross beam profile;
(3) a supporting clamp is additionally arranged between the two connecting brackets;
(4) placing the front lower protective welding assembly part into a heating furnace to be heated to 880-930 ℃, and keeping the temperature for 5-7 min to perform uniform austenitizing;
(5) transferring the heated front lower protective part into a cooling water tank from a heating furnace within 10s, wherein the temperature of the part before quenching is not lower than 650 ℃, the part is quenched and cooled by cooling water and taken out after reaching normal temperature, and the cooling rate is more than 100 ℃/s to ensure complete martensite;
(6) separating the supporting clamp from the assembly part to obtain the supporting clamp;
the front lower guard assembly is made of a hot forming steel material 22MnB 5.
2. The process of manufacturing an ultra-high strength commercial vehicle front underrun protection according to claim 1, wherein: axial reinforcing grooves are respectively formed in the front side steel plate and the rear side steel plate of the lower protective cross beam.
3. The process of manufacturing an ultra-high strength commercial vehicle front underrun protection according to claim 1, wherein: the clamp is made of heat-resistant steel Cr25Ni 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889392.7A CN112059548B (en) | 2020-08-28 | 2020-08-28 | Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010889392.7A CN112059548B (en) | 2020-08-28 | 2020-08-28 | Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112059548A CN112059548A (en) | 2020-12-11 |
| CN112059548B true CN112059548B (en) | 2022-01-25 |
Family
ID=73659728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010889392.7A Active CN112059548B (en) | 2020-08-28 | 2020-08-28 | Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112059548B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201559605U (en) * | 2009-12-07 | 2010-08-25 | 北汽福田汽车股份有限公司 | Vehicle front lower portion protection device |
| CN103233109A (en) * | 2013-05-13 | 2013-08-07 | 武汉钢铁(集团)公司 | Control method and device for hot-forming plasticity distribution of high-strength steel |
| CN206938685U (en) * | 2017-07-13 | 2018-01-30 | 东风商用车有限公司 | Front lower protection device |
| CN209700590U (en) * | 2019-04-23 | 2019-11-29 | 湖北凸凹模具科技股份有限公司 | A kind of front lower protection crossbeam of lightweight commercial vehicle based on high-strength plate |
| CN111203686A (en) * | 2018-11-21 | 2020-05-29 | 郑州宇通客车股份有限公司 | Preparation process of ultrahigh-strength vehicle framework section bar |
-
2020
- 2020-08-28 CN CN202010889392.7A patent/CN112059548B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201559605U (en) * | 2009-12-07 | 2010-08-25 | 北汽福田汽车股份有限公司 | Vehicle front lower portion protection device |
| CN103233109A (en) * | 2013-05-13 | 2013-08-07 | 武汉钢铁(集团)公司 | Control method and device for hot-forming plasticity distribution of high-strength steel |
| CN206938685U (en) * | 2017-07-13 | 2018-01-30 | 东风商用车有限公司 | Front lower protection device |
| CN111203686A (en) * | 2018-11-21 | 2020-05-29 | 郑州宇通客车股份有限公司 | Preparation process of ultrahigh-strength vehicle framework section bar |
| CN209700590U (en) * | 2019-04-23 | 2019-11-29 | 湖北凸凹模具科技股份有限公司 | A kind of front lower protection crossbeam of lightweight commercial vehicle based on high-strength plate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112059548A (en) | 2020-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4833323B2 (en) | Vehicle member manufacturing method and side member using the same | |
| JP5137322B2 (en) | Bumper reinforcement | |
| JP5137323B2 (en) | Bumper reinforcing member manufacturing method | |
| US10166593B2 (en) | Manufacturing method for bumper beam of vehicle | |
| JP2015051754A (en) | Bumper structure and method for production of bumper beam | |
| KR20100096832A (en) | Cooling system for press mold and method for producing automobile parts using the same | |
| US8635835B2 (en) | Hollow member | |
| CN112059548B (en) | Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle | |
| KR101140293B1 (en) | Body frame of automotive vehicle using high tensile strength steel tube | |
| CN105665576A (en) | Steel forming method and forming component | |
| US20210140021A1 (en) | Automotive component with enhanced strength | |
| KR100987901B1 (en) | Use of uhss pipe bumper lower stiffener reinf and it's manufacturing method | |
| KR101116633B1 (en) | Method for fabricating a member of vehicle | |
| CN111203686A (en) | Preparation process of ultrahigh-strength vehicle framework section bar | |
| EP2675928B1 (en) | Method for manufacturing high-strength steel sheet parts subject in use to fatigue stresses | |
| JP5251764B2 (en) | Vehicle structural member and method for manufacturing the same | |
| KR20160085979A (en) | Bumper back beam for a vehicle and the method of manufacturing the same | |
| CN110777298B (en) | Steel for double-phase high-strength steel hollow part and hot bulging forming process thereof | |
| CN114770037B (en) | Manufacturing and assembling method of lightweight car door bumper | |
| Iyer et al. | Application of advanced high strength stainless steel for mass reduction in automotive structures-a front bumper beam case study | |
| KR101107955B1 (en) | Manufacturing method for automobile rear wheel tubular torsion beam | |
| CN113621884A (en) | Lightweight automobile roof rear cross beam lower plate, preparation method and rear cross beam assembly | |
| KR101447835B1 (en) | Manufacturing method of ultra high strength thin pipe for motors and bumper beam using the pipe | |
| JPH05117748A (en) | Production of high-strength electric resistance welded tube | |
| CN113621883A (en) | Lightweight automobile roof front cross beam lower plate, preparation method and front cross beam assembly |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |