CN115927961A - Lightweight high-strength automobile protection beam, preparation method thereof and stretch bender - Google Patents
Lightweight high-strength automobile protection beam, preparation method thereof and stretch bender Download PDFInfo
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Abstract
The application relates to the technical field of automobile part manufacturing, in particular to a high-strength automobile protective beam and a preparation method thereof. A lightweight high-strength automobile protection beam is formed by hot stretch bending of the following component profiles in percentage by weight: c:0.15-0.35%, mn:1.0-1.8%, less than or equal to 1.3% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities. The application discloses lightweight high strength automobile protection roof beam is under the prerequisite that has lightweight high strength, still has the advantage that is difficult for kick-backing or fracture when stretch bending.
Description
Technical Field
The application relates to the technical field of automobile part manufacturing, in particular to a high-strength automobile protective beam, a preparation method thereof and a stretch bender.
Background
The automobile protection beam is an automobile part prepared from metal alloy, is usually connected with a frame longitudinal beam, is used as a first barrier for passive safety of an automobile, and is one of important safety devices for absorbing and buffering external impact force and protecting the front and rear parts of the automobile.
The existing truck front guard beam is prepared by adopting low-strength steel, and the performance of high strength is achieved by thickening. However, the operation of thickening results in a larger overall weight of the automobile guard beam, which is not in line with the requirement of light weight of automobile parts. And because the both ends of automobile guard beam need inwards bend, so when using high strength steel to prepare automobile guard beam, automobile guard beam appears springback or fracture very easily, and then leads to the qualification rate of automobile guard beam to be lower.
Disclosure of Invention
In order to overcome the defect that when high-strength steel is used for preparing an automobile guard beam, the automobile guard beam is easy to rebound or crack, the application provides a light-weight high-strength automobile guard beam, a preparation method thereof and a stretch bender.
First aspect, this application provides a lightweight high strength car guard beam, adopts following technical scheme: a lightweight high-strength automobile protection beam is formed by hot stretch bending of the following component profiles in percentage by weight: c:0.15-0.35%, mn:1.0 to 1.8 percent of Fe, less than or equal to 1.3 percent of Si, less than or equal to 0.005 percent of B, and the balance of Fe and inevitable impurities.
C: carbon is a basic element in steel, if the carbon content is set to be low, the plasticity of the steel is relatively strong, and if the carbon content is set to be high, the strength of the steel is high. In the application, the content of the carbon is selected from 0.15-0.35%, so that the prepared automobile protective beam has excellent compressive strength, yield strength and elongation.
Mn: manganese has the effect of solid solution strengthening, is an important element for expanding an austenite phase region, can reduce the critical quenching speed of steel, stabilizes austenite, refines crystal grains and delays the transformation from the austenite to pearlite. In the application, the manganese content is selected from 1.0-1.8%, if the manganese content exceeds 1.8%, the strength of the pipe is too high when the automobile protection beam is prepared, the processing difficulty is further increased, and even manganese segregation occurs during steel making, so that the automobile protection beam is broken when the automobile protection beam is subjected to hot bending.
Si: silicon, which is a basic element in steel, suppresses the coefficient of carbon doping in a certain temperature range, so that carbon atoms diffuse from martensite into retained austenite, thereby stabilizing the retained austenite. However, if the silicon content exceeds 1.3%, the automobile bumper beam is easily hot-cracked when subjected to thermal stretch bending.
B: boron has the functions of improving the high-temperature strength of steel, strengthening grain boundaries and delaying the formation of iron elements and pearlite, so that the formation of martensite can be assisted during rapid quenching, and the strength of the automobile protective beam is further increased. In addition, the strength of the automobile protection beam can be effectively increased by adding a small amount of boron, but if the strength exceeds 0.005%, the strength of the automobile protection beam is not increased greatly.
In the application, the strength of the automobile protection beam can be effectively improved by adding the components, so that the automobile protection beam has the functions of light weight and high strength. The content of the components can temporarily reduce the strength of the automobile protective beam when the automobile protective beam is subjected to a hot stretch bending process, so that the possibility of springback or cracking of the automobile protective beam is effectively reduced, and the stretch bending qualification rate of the automobile protective beam is effectively increased.
Preferably, the composite material is obtained by hot stretch bending and forming the following component sectional materials in percentage by weight: c:0.21-0.35%, mn:1.0-1.8%, less than or equal to 1.3% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities.
When the content of carbon is between 0.15 and 0.20 percent, the tensile strength of the automobile protective beam is between 1200 and 1400MPa, the yield strength is between 800 and 900, and the elongation is between 6 and 8 percent. When the carbon content is between 0.21 and 0.35 percent, the tensile strength of the automobile protective beam is between 1200 and 1800MPa, the yield strength is between 900 and 1300MPa, and the elongation is between 4 and 8 percent, obviously, when the carbon content is between 0.21 and 0.35 percent, the prepared automobile protective beam has excellent strength and also has excellent elongation, thereby effectively reducing the possibility of springback or cracking of the automobile protective beam when the automobile protective beam is subjected to a hot stretch bending process.
Preferably, the composite material is obtained by hot stretch bending and forming the following component sectional materials in percentage by weight: c:0.21-0.35%, mn:1.0-1.8%, less than or equal to 0.5% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities.
When the content of carbon is increased, the strength of the automobile guard beam is synchronously increased, however, when the automobile guard beam is subjected to a hot stretch bending process at the content, the automobile guard beam is more easily subjected to hot cracking, and when the content of silicon is properly reduced, the possibility of hot cracking of the automobile guard beam can be effectively reduced.
In a second aspect, the application provides a preparation method of a lightweight high-strength automobile guard beam, which adopts the following technical scheme:
a preparation method of a lightweight high-strength automobile protection beam comprises the following steps:
the method comprises the following steps: c, mn, si, B and Fe are mixed, and then are smelted and cast into a section blank;
step two: cutting the section blank into required length, heating and preserving heat to convert the section blank into austenite, and then performing hot stretch bending on the section blank to obtain a rough-processed automobile protection beam;
step three: and then, rapidly and uniformly cooling the rough-machined automobile guard beam, so that the rough-machined automobile guard beam is converted into martensite from austenite, and the lightweight high-strength automobile guard beam is obtained.
When the components with the contents are adopted and matched with hot stretch bending, the automobile guard beam is converted into austenite with lower strength, so that the possibility of springback or cracking of the automobile guard beam is effectively reduced. And the operation of uniform cooling can promote the automobile protection beam to be converted into martensite from austenite, so that the automobile protection beam is promoted to obtain the characteristics of high strength and high toughness.
Preferably, in the second step, the heating temperature is 900-950 ℃, and the heat preservation time is 3-10min.
When the hot stretch bending process is carried out at 900-950 ℃ and the heat preservation time is 3-10min, the automobile protective beam can be quickly and stably transformed into austenite, so that the strength of the automobile protective beam is stably reduced, and the possibility of springback or cracking of the automobile protective beam during hot stretch bending operation is effectively reduced.
Preferably, in the third step, the cooling speed is 23-87 ℃/s.
When the cooling operation has the cooling speed of 23-87 ℃, the automobile protective beam can be more simply and stably transformed from austenite to martensite, and the strength and the toughness of the automobile protective beam are further effectively improved.
The third aspect, the application provides a stretch bender of lightweight high strength automobile guard beam, adopts following technical scheme:
a stretch bender of a lightweight high-strength automobile protection beam comprises a frame, roll bending devices symmetrically arranged at two ends of the frame and a transmission device transversely arranged along the length direction of the frame;
the frame is provided with a limiting seat, a moving channel is formed in the limiting seat, the transmission device is arranged in the moving channel, and the transmission device drives the automobile protection beam to transversely move in the moving channel;
the two roll bending devices are respectively arranged at two ends of the moving channel; the roll bending device comprises a rotary hydraulic oil cylinder arranged on the rack, a connecting disc fixedly connected to the output end of the rotary hydraulic oil cylinder and a roll bending wheel arranged at the eccentric position of the connecting disc; the two ends of the limiting seat are provided with arc surfaces, and the rotating hydraulic oil cylinder extrudes the end part of the automobile protection beam to the arc surfaces through the roll bending wheel.
When the automobile protection beam needs to be subjected to hot stretch bending operation, a worker can firstly transfer the heated automobile protection beam to the moving channel, and at the moment, the transmission device transversely transfers the automobile protection beam, so that the automobile protection beam is completely transferred into the moving channel. And then, rotating a hydraulic oil cylinder to control the roll bending wheel to extrude the end part of the automobile protection beam to the arc surface, thereby realizing the stretch bending operation of the automobile protection beam.
At present, common stretch bender has the centre gripping pipe fitting both ends to carry out the stretch bending and vertical extrusion and roll two kinds of modes of cooperation in coordination, wherein the centre gripping pipe fitting both ends are carried out the stretch bending and are required the pipe fitting to remain longer clamping part, then excise, and when vertical extrusion and roll form of cooperation in coordination were carried out the stretch bending to the automobile protective guard, because one-way rolling nature, it need carry out the stretch bending to the both ends of automobile protective beam respectively, and can't realize the operation that automobile protective beam both ends were simultaneously stretched the bend completely, thereby lead to the machining efficiency of automobile protective beam to be lower.
Preferably, the outer end face of the connecting disc is provided with a plurality of limiting holes, and the limiting holes are arranged in a straight line outwards at uniform intervals from the circle center of the connecting disc; the roll bending wheel includes the connecting rod and rotates the wheel portion of connecting on the connecting rod, the connecting rod can dismantle connect in spacing downthehole.
Because the connecting rod can be dismantled and connect in spacing downthehole, so when the automobile protection roof beam of the different radians of needs stretch bending formation, the staff can select the wheel portion that is fit for the diameter according to actual conditions to effectively increase the practicality of stretch bending.
Preferably, the device further comprises a transfer device for transferring the automobile protection beam to the cooling area, wherein the transfer device comprises a conveyor belt and pushing assemblies symmetrically arranged on the rack;
the propelling movement subassembly includes propelling movement pneumatic cylinder and propelling movement piece, the propelling movement pneumatic cylinder set up in removal passageway department, propelling movement piece fixed connection in the output of propelling movement pneumatic cylinder, set up the standing groove that supplies car protective beam to place on the propelling movement piece, the propelling movement pneumatic cylinder shifts the car protective beam that the stretch bending finishes to conveyer belt department through the propelling movement piece, the conveyer belt will the car protective beam that the stretch bending finishes shifts to cooling space.
Because the two ends of the automobile protection beam are provided with a section of bending part after the automobile protection beam is bent, the existence of the bending part can cause that the conveying device is difficult to transfer the automobile protection beam to a cooling area. In the application, after the automobile protection beam is completely bent, the pushing hydraulic cylinder can separate the automobile protection beam which is completely bent from the moving channel through the supporting and conveying block and finally transfer the automobile protection beam to the conveying belt, and then the transfer operation of the automobile protection beam which is completely bent is completed.
Preferably, the transfer device further comprises a plurality of linkage assemblies, each linkage assembly comprises a base, a first gear, a second gear, a first rack, a driving motor and a rotating roller, the first gear and the second gear are rotatably connected to the base, and the first gear is meshed with the second gear;
the first rack is connected to the base in a sliding manner, the first rack is meshed with the first gear, the driving motor is fixedly connected to the upper end of the first rack, and the rotating roller is fixedly connected to the output end of the driving motor; the lower terminal surface of propelling movement piece is provided with the second rack, the second rack with second gear intermeshing, first rack passes through first gear makes the second gear is rotatory, the second gear orders about the live-rollers through the second rack and shifts up and support the automobile protection roof beam that the bending finishes, driving motor shifts the automobile protection roof beam that the bending finishes to conveyer belt department through the driving roller.
When the pushing hydraulic cylinder breaks away from the moving channel through the supporting and conveying block, the first rack enables the second gear to rotate through the first gear, the second gear drives the rotating roller to move upwards through the second rack and supports the automobile protection beam after bending is finished, and the driving motor transfers the automobile protection beam after bending to the conveying belt through the driving roller, so that the transfer operation of the automobile protection beam after bending is finished is realized.
In summary, the present application has the following beneficial effects:
the addition of C, mn, si and B can effectively improve the strength of the automobile protection beam, so that the automobile protection beam has the functions of light weight and high strength;
2.C:0.15-0.35%, mn: the proportion of 1.0-1.8 percent, less than or equal to 1.3 percent of Si and less than or equal to 0.005 percent of B can transform the automobile guard beam into austenite with lower strength when the hot stretch bending process is carried out on the automobile guard beam, thereby effectively reducing the possibility of the automobile guard beam rebounding or cracking.
3. The operation of uniform cooling can promote the automobile guard beam to be transformed from austenite to martensite, thereby promoting the automobile guard beam to obtain the characteristics of high strength and high toughness.
Drawings
FIG. 1 is a schematic structural view of a stretch bender for a lightweight, high strength automotive containment beam;
FIG. 2 is an enlarged schematic view of section A of FIG. 1;
FIG. 3 is a schematic structural view of the transmission;
FIG. 4 is an exploded schematic view of the roll bending apparatus;
FIG. 5 is a schematic diagram of a push assembly;
FIG. 6 is a schematic structural view of the pushing assembly and the linking assembly;
reference numerals: 1. a frame; 2. a roll bending device; 3. a transmission device; 4. a transfer device; 11. a limiting seat; 12. a moving channel; 13. a circular arc surface; 21. rotating the hydraulic oil cylinder; 22. a connecting disc; 23. a roll bending wheel; 31. a drive motor; 32. a drive roll; 33. a driving roller; 34. a drive belt; 41. a conveyor belt; 42. a push assembly; 43. a linkage assembly; 221. a limiting hole; 231. a connecting rod; 232. a wheel portion; 421. a pushing hydraulic cylinder; 422. a pushing block; 423. a placement groove; 431. a base; 432. a first gear; 433. a second gear; 434. a first rack; 435. a second rack; 436. a drive motor; 437. the roller is rotated.
Detailed Description
The present application will be described in further detail with reference to the accompanying FIGS. 1 to 6 and examples and comparative examples.
Examples
Example 1
A lightweight high-strength automobile protection beam is formed by hot stretch bending of the following component profiles in percentage by weight: c:0.15%, mn:1.4%, si:1.3%, B:0.005% and the balance of Fe and inevitable impurities; the weight of the lightweight high-strength automobile guard beam can be selected according to the actual size of the vehicle, and the embodiment is described by taking 10kg as an example.
A preparation method of a lightweight high-strength automobile protection beam comprises the following steps:
the method comprises the following steps: c, mn, si, B and Fe are mixed, then smelting is carried out at the temperature of 1560 ℃, and then a section blank is cast;
step two: cutting the section bar blank into required length, heating to 900 ℃ and preserving heat for 3min to convert the section bar blank into austenite, and then performing hot stretch bending on the section bar blank by a stretch bender to obtain a rough-processed automobile protection beam;
step three: then, rapidly and uniformly cooling the rough-machined automobile guard beam by water cooling or air cooling at the cooling speed of 35 ℃/s, so that the rough-machined automobile guard beam is converted into martensite from austenite, and the lightweight high-strength automobile guard beam is obtained;
the stretch bender for processing the lightweight high-strength automobile protection beam has the following structure:
referring to fig. 1 and 2, the stretch bender includes a frame 1, roll bending devices 2 symmetrically disposed at both ends of the frame 1, a transmission device 3 transversely disposed along a length direction of the frame 1, and a transfer device 4 disposed at the transmission device 3.
The machine frame 1 is used for supporting the automobile protection beam, the transmission device 3 is used for transferring two ends of the automobile protection beam to the roll bending device 2, the roll bending device 2 is used for performing stretch bending operation on two ends of the automobile protection beam, and the transfer device 4 is used for transferring the automobile protection beam after the stretch bending operation to a cooling area.
The rack 1 is provided with the spacing seat 11 of the terminal surface fixedly connected with of transmission 3, and the removal passageway 12 has transversely been seted up to spacing seat 11, and transmission 3 sets up in removal passageway 12 department. The two ends of the limiting seat 11 are provided with arc surfaces 13. The two roll bending devices 2 are respectively arranged at the two arc surfaces 13.
Referring to fig. 1 and 3, the transmission device 3 includes a transmission motor 31, a drive roller 32, six transmission rollers 33, and a transmission belt 34, wherein the transmission motor 31 is fixedly connected to the frame 1, the drive roller 32 is fixedly connected to an output end of the transmission motor 31, the drive roller 32 and the six transmission rollers 33 are both rotatably connected to the frame 1, and the drive roller 32 and the six transmission rollers 33 are both located at the moving channel 12. The driving belt 34 is wound around the peripheries of the driving roller 32 and the six driving rollers 33, and the driving roller 32 drives the six driving rollers 33 to synchronously rotate through the driving belt 34.
When the automobile protection beam that finishes heating needs to be subjected to stretch bending operation, the worker can firstly transfer the automobile protection beam to the end part of the moving channel 12 through the manipulator, at the moment, the driving roller 33 is started, and the driving roller 33 drives the automobile protection beam to move, so that the two ends of the automobile protection beam are transferred to the roll bending device 2.
Referring to fig. 2 and 4, the roll bending apparatus 2 includes a rotary hydraulic cylinder 21 fixedly connected to the frame 1, a connection plate 22 fixedly connected to an output end of the rotary hydraulic cylinder 21, and a roll bending wheel 23 detachably connected to an eccentric portion of the connection plate 22.
The roll bending wheel 23 comprises a connecting rod 231 and a wheel portion 232 rotatably connected to the connecting rod 231, four limiting holes 221 are formed in the outer end face of the connecting rod 231, the four limiting holes 221 are formed in the circular uniform interval outward straight line of the connecting disc 22, and the four limiting holes 221 are used for fixing the connecting rod 231.
When the both ends of automobile guard bar need be carried out the stretch bending operation, the staff can directly open two rotary hydraulic cylinder 21, and rotary hydraulic cylinder 21 can drive roll bending wheel 23 through connection pad 22 and carry out curvilinear motion, and then extrudees the both ends of automobile guard beam to arc surface 13 department to accomplish the stretch bending operation to automobile guard beam.
And when the automobile protection beam with different radian requirements needs to be subjected to stretch bending, a worker can select the roll bending wheels 23 with different diameters according to actual conditions and fix the connecting rod 231 in different limiting holes 221 according to actual conditions.
Referring to fig. 1 and 5, the transferring device 4 includes a conveying belt 41, two pushing assemblies 42 and two linking assemblies 43, wherein the two pushing assemblies 42 are disposed at the moving channel 12, the two linking assemblies 43 are disposed at the feeding end of the conveying belt 41, and the two pushing assemblies 42 and the two linking assemblies 43 correspond to each other.
Referring to fig. 5 and 6, the pushing assembly 42 includes a pushing hydraulic cylinder 421 and a pushing block 422, the pushing hydraulic cylinder 421 is fixedly connected to the moving channel 12, the pushing block 422 is fixedly connected to an output end of the pushing hydraulic cylinder 421, and a placing groove 423 for placing the automobile protection beam is formed in an upper end surface of the pushing block 422.
The linkage assembly 43 includes a base 431, a first gear 432, a second gear 433, a first rack 434, a driving motor 436, and a rotating roller 437, wherein the first gear 432 and the second gear 433 are both rotatably connected to the base 431, and the first gear 432 and the second gear 433 are engaged with each other.
The first rack 434 is slidably coupled to an upper end surface of the base 431, the first rack 434 is engaged with the first gear 432, the driving motor 436 is fixedly coupled to an upper end of the first rack 434, and the rotating roller 437 is fixedly coupled to an output end of the driving motor 436. A second rack 435 is fixedly connected to the lower end surface of the pushing block 422, and the second rack 435 and the second gear 433 are engaged with each other.
After the automobile protection beam is completely bent, a worker can start the pushing hydraulic cylinder 421, and the pushing hydraulic cylinder 421 transfers the automobile protection beam out of the moving channel 12 through the pushing block 422. At this time, the first rack 434 moves synchronously with the pushing block 422, and the first gear 432 is driven by the first rack 434 to drive the second gear 433 to rotate reversely. The rotation of the second gear 433 drives the second rack 435 to move upwards and support the automobile guard beam after bending. Finally, the drive motor 436 transfers the automobile guard beam after bending to the conveyor belt 41 through the driving roller 33. And then the transfer operation of the automobile protection beam after the bending is finished is completed.
In this embodiment, the fixing connection may be implemented by welding, integral molding, bolt fixing, or thread connection. The detachable connection can adopt conventional detachable connection modes such as threaded connection, clamping connection and interference fit according to actual use. The rotary connection can adopt conventional rotary connection modes such as pin shaft connection and the like according to the actual use. The sliding connection can be realized by adopting conventional sliding connection modes such as a track or a sliding chute according to the actual selection.
Examples 2 to 17
The difference from example 1 is that the contents of the components are different, as shown in table 1.
TABLE 1 Components of examples 1 to 17 and their content amounts (wt%)
Example 18
The difference from example 16 is that the heating temperature, holding time and cooling rate in step two are different, as shown in table 2.
TABLE 2 tables of the respective parameters of the production methods in example 16 and examples 18 to 24
| Heating temperature/. Degree.C | Holding time/min | Cooling rate ℃/s | |
| Example 16 | 900 | 3 | 35 |
| Example 18 | 930 | 6 | 35 |
| Example 19 | 950 | 10 | 35 |
| Example 20 | 880 | 2 | 35 |
| Example 21 | 970 | 12 | 35 |
| Example 22 | 930 | 6 | 52 |
| Example 23 | 930 | 6 | 71 |
| Example 24 | 930 | 6 | 23 |
| Example 25 | 930 | 6 | 87 |
Comparative example
Comparative example 1
The difference from example 1 is that the lightweight high-strength automobile guard beam is directly processed by cold stretch bending.
Performance test
Detection method
1. Test for compressive Strength
Three samples were taken from examples 1 to 25 and comparative example 1, and then the compressive strength of the samples was measured with reference to GB/T7314-2017 "metallic Material Room temperature compression test method" and averaged.
2. Yield strength test
Three samples were taken from examples 1 to 25 and comparative example 1, respectively, and then subjected to a tensile test with reference to GB/T228-2002 "indoor tensile test method for metallic materials", followed by obtaining a yield strength from a stress-strain curve and averaging.
3. Elongation test
Three samples were taken from examples 1 to 25 and comparative example 1, and then the elongation of the samples was measured with reference to GB/T228-2002 "indoor tensile test for Metal Material", and the average value was taken.
4. Surface topography
Three samples were taken from examples 1 to 25 and comparative example 1, respectively, followed by visual observation of the number of cracks on the sample surface, followed by characterization of the surface topography according to Sa, as follows:
sa0: the surface is not cracked;
sa1: fine cracks (5 or less) exist on the surface;
sa2: a small number of cracks (5-10) exist on the surface;
sa3: cracks (10-15) exist on the surface;
sa4: there were a large number of cracks (more than 15) on the surface.
And (3) detection results: the data of the above detection method are specifically shown in table 3.
TABLE 3 compression Strength, yield Strength, elongation Table of examples 1 to 25 and comparative example 1
As can be seen by combining examples 1 to 7 and comparative example 1 and combining table 3, the compressive strength, yield strength and surface morphology of example 1 are significantly improved compared to comparative example 1, and thus it is demonstrated that, under the composition ratio of example 1, the hot stretch bending process can promote the automobile guard rail to have a certain strength, and effectively improve the defect that the automobile guard beam is prone to cracking during stretch bending.
While the compression strength and yield strength of example 6 are higher than those of examples 1 to 5, the elongation and surface morphology of example 6 are relatively poor, while the surface morphology and elongation of example 7 are relatively superior, but the compression strength and yield strength of example 7 are slightly inferior, so that the components of the automobile guard rail are relatively better than those of examples 1 to 5.
Compared with the embodiment 1 and the embodiment 5, the embodiment 2-4 has relatively higher compressive strength, yield strength and surface appearance, so that the defect that the automobile protective beam is easy to crack during stretch bending can be effectively overcome on the premise of ensuring certain strength by the components of the embodiment 2-4.
It can be seen from the combination of examples 3, 8-11 and table 3 that the compressive strength and yield strength of the automobile guard beam gradually increase with the increase of the Mn content, but when the Mn content reaches 1.8%, if the Mn content is increased, the surface morphology of the automobile guard beam gradually deteriorates, and this is because, if the Mn content exceeds 1.8%, manganese segregation occurs during steel making, which in turn causes the automobile guard beam to break during hot stretch bending.
As can be seen by combining example 3, examples 12 to 13 and Table 3, the compressive strength and yield strength of the automobile guard beam gradually increased with the increase in the B content, but when the B content reached 0.005%, the increase in the strength of the automobile guard beam was not large if the B content was further increased.
It can be seen from the combination of example 3 and examples 14-17 and table 3 that the compressive strength and yield strength of the automobile guard beam gradually increase with the increase of the Si content, but when the Si content reaches 0.5%, if the Si content is increased, the automobile guard beam is easily hot-cracked during hot stretch bending, and the surface appearance is poor.
It can be seen from the combination of examples 16, 18 to 21 and table 3 that the compressive strength, yield strength, elongation and surface morphology of the automobile protection beam are improved as the heating temperature and the heat preservation time are increased, but when the heating temperature reaches 930 ℃ and the heat preservation time reaches 6min, if the heating temperature and the heat preservation time are increased, the compressive strength, yield strength, elongation and surface morphology of the automobile protection beam are sometimes decreased, that is, the heating temperature is 900 to 950 ℃ and the heat preservation time is 9 to 10min in the hot stretch bending process, so that the effect is relatively better.
It can be seen from the combination of example 16, examples 22-25 and Table 3 that the compressive strength, yield strength, elongation and surface morphology of the automobile guard beam are improved with the increase of the cooling rate, but when the cooling rate reaches 52 ℃/s, if the cooling rate is increased again, the compressive strength, yield strength, elongation and surface morphology of the automobile guard beam are sometimes reduced, that is, the effect of the cooling rate of 35-71 ℃/s in the hot stretch bending process is relatively better.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The lightweight high-strength automobile protection beam is characterized by being formed by hot stretch bending of the following component sectional materials in percentage by weight: c:0.15-0.35%, mn:1.0-1.8%, less than or equal to 1.3% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities.
2. The light-weight high-strength automobile guard beam according to claim 1, characterized by being formed by hot stretch bending of the following component profiles in percentage by weight: c:0.21-0.35%, mn:1.0-1.8%, less than or equal to 1.3% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities.
3. The light-weight high-strength automobile guard beam according to claim 2, characterized by being formed by hot stretch bending of the following component profiles in percentage by weight: c:0.21-0.35%, mn:1.0-1.8%, less than or equal to 0.5% of Si, less than or equal to 0.005% of B, and the balance of Fe and inevitable impurities.
4. A method of manufacturing a lightweight, high strength automotive bumper beam according to any one of claims 1-3, comprising the steps of:
the method comprises the following steps: c, mn, si, B and Fe are mixed, and then are smelted and cast into a section blank;
step two: cutting the section blank into required length, heating and preserving heat to convert the section blank into austenite, and then performing hot stretch bending on the section blank to obtain a rough-processed automobile protection beam;
step three: and then, rapidly and uniformly cooling the rough-machined automobile guard beam, so that the rough-machined automobile guard beam is transformed from austenite to martensite, and the lightweight high-strength automobile guard beam is obtained.
5. The method for manufacturing a lightweight high-strength automobile guard beam according to claim 4, characterized in that: in the second step, the heating temperature is 900-950 ℃, and the heat preservation time is 3-10min.
6. The method for manufacturing a lightweight high-strength automobile guard beam according to claim 5, characterized in that: in the third step, the cooling speed is 23-87 ℃/s.
7. A stretch bender for processing a lightweight high strength automotive containment beam according to any one of claims 1-3, wherein: the bending machine comprises a rack (1), roll bending devices (2) symmetrically arranged at two ends of the rack (1) and a transmission device (3) transversely arranged along the length direction of the rack (1);
a limiting seat (11) is arranged on the rack (1), a moving channel (12) is formed in the limiting seat (11), the transmission device (3) is arranged in the moving channel (12), and the transmission device (3) drives the automobile protection beam to move transversely in the moving channel (12);
the two roll bending devices (2) are respectively arranged at two ends of the moving channel (12); the roll bending device (2) comprises a rotary hydraulic oil cylinder (21) arranged on the frame (1), a connecting disc (22) fixedly connected to the output end of the rotary hydraulic oil cylinder (21) and a roll bending wheel (23) arranged at the eccentric position of the connecting disc (22); arc surfaces (13) are arranged at two ends of the limiting seat (11), and the end part of the automobile protection beam is extruded to the arc surfaces (13) by the rotary hydraulic oil cylinder (21) through the roll bending wheel (23).
8. The stretch bender for lightweight high strength automotive guard beams according to claim 7, characterized in that: a plurality of limiting holes (221) are formed in the outer end face of the connecting disc (22), and the limiting holes (221) are arranged outwards in a straight line at intervals from the circle center of the connecting disc (22); the roll bending wheel (23) comprises a connecting rod (231) and a wheel part (232) which is rotatably connected onto the connecting rod (231), and the connecting rod (231) is detachably connected into the limiting hole (221).
9. The stretch bender for lightweight high strength automotive guard beams according to claim 7, characterized in that: the device comprises a rack (1) and a transferring device (4) for transferring the automobile guard beam to a cooling area, wherein the transferring device (4) comprises a conveyor belt (41) and pushing assemblies (42) symmetrically arranged on the rack (1);
propelling movement subassembly (42) are including propelling movement pneumatic cylinder (421) and propelling movement piece (422), propelling movement pneumatic cylinder (421) set up in removal passageway (12) department, propelling movement piece (422) fixed connection in the output of propelling movement pneumatic cylinder (421), set up standing groove (423) that supply car guard beam to place on propelling movement piece (422), propelling movement pneumatic cylinder (421) shift the car guard beam that the stretch bending finishes to conveyer belt (41) department through propelling movement piece (422), conveyer belt (41) will the car guard beam that the stretch bending finishes shifts to cooling space.
10. The stretch bender for lightweight high strength automotive containment beams according to claim 9, wherein: the transfer device (4) further comprises a plurality of linkage assemblies (43), each linkage assembly (43) comprises a base (431), a first gear (432), a second gear (433), a first rack (434), a driving motor (436) and a rotating roller (437), the first gear (432) and the second gear (433) are both rotationally connected to the base (431), and the first gear (432) and the second gear (433) are meshed with each other;
the first rack (434) is connected to the base (431) in a sliding manner, the first rack (434) is meshed with the first gear (432), the driving motor (436) is fixedly connected to the upper end of the first rack (434), and the rotating roller (437) is fixedly connected to the output end of the driving motor (436); the lower end face of the pushing block (422) is provided with a second rack (435), the second rack (435) is meshed with the second gear (433), the first rack (434) enables the second gear (433) to rotate through the first gear (432), the second gear (433) enables a rotating roller (437) to move upwards through the second rack (435) and supports the automobile protection beam after bending, and the driving motor (436) transfers the automobile protection beam after bending to the conveying belt (41) through a transmission roller (33).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211524908.3A CN115927961A (en) | 2022-12-01 | 2022-12-01 | Lightweight high-strength automobile protection beam, preparation method thereof and stretch bender |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211524908.3A CN115927961A (en) | 2022-12-01 | 2022-12-01 | Lightweight high-strength automobile protection beam, preparation method thereof and stretch bender |
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