CN111168338A - Vehicle closed angle square tube production line - Google Patents
Vehicle closed angle square tube production line Download PDFInfo
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- CN111168338A CN111168338A CN202010186137.6A CN202010186137A CN111168338A CN 111168338 A CN111168338 A CN 111168338A CN 202010186137 A CN202010186137 A CN 202010186137A CN 111168338 A CN111168338 A CN 111168338A
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- production line
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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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/06—Metal-working plant comprising a number of associated machines or apparatus
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- Optics & Photonics (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The utility model provides a vehicle closed angle side pipe production line, includes material loading machine (1), primary forming roll unit (2), welding equipment (3), water-cooling equipment (4), heater (5), thermoforming roll unit (6), integer roll unit (7) and aligning gear (8). The invention gives full play to the characteristics of the cold rolling process, creatively applies the hot forming and welding technology to the cold rolling production line, solves the problem of rapid forming of sharp-angled square tube parts, and has the characteristics of rapid forming speed, good quality, low cost and raw material saving.
Description
Technical Field
The invention relates to a cold rolling technology, in particular to a technology for preparing a sharp-angled section without arc transition by using a cold rolling welding and hot rolling phase structure, and particularly relates to a vehicle sharp-angled square tube production line.
Background
At present, in some large electromechanical products, such as the square beam for the high-speed rail vehicle shown in fig. 1, not only the length is long and generally exceeds more than 10 meters, but also four corners are required to be sharp corners (right angles), arc transition should not be driven, and the thickness of the square beam does not exceed 10 millimeters. If the section with the special structure is formed by hot rolling, the thickness of the section is not suitable for hot rolling, the section is mechanically removed after hot rolling, the preparation period is long, the material waste is serious, the cost is too high, and a sharp corner or a sharp corner structure cannot be machined by hot rolling, so that the hot rolling process cannot be used. If four plates are adopted for welding, the welding workload is large, the quality cannot be guaranteed, the workload of polishing in the later period is huge, the cost is high, the period is long, and the method is not advisable. Therefore, it is urgently needed to develop a new forming device to solve the processing problem of such special structure.
Disclosure of Invention
The invention aims to solve the problem that a square sharp-angle thin-wall strip-shaped square tube can not be subjected to hot rolling forming and cold rolling forming, and provides a vehicle sharp-angle square tube production line combining cold rolling, welding and hot forming technologies.
The technical scheme of the invention is as follows:
the utility model provides a vehicle closed angle side pipe production line which characterized by includes:
a feeding machine 1, wherein the feeding machine 1 places the cut steel strip coil on the initial end of a cold rolling production line;
a primary forming roll unit 2 for rolling the flat steel strip into a square tube shape step by step, wherein a seam of the square tube is positioned at the center of the uppermost edge;
the welding equipment 3 is used for welding the abutted seams at the upper center of the square pipe together to form a closed structure;
the water cooling equipment 4 is used for reducing the temperature of the welding seam of the welded square pipe to normal temperature so as to be carried out subsequently;
a heater 5 for heating the four corners of the square tube to raise the temperature of the four corners to a plastic deformation state;
a hot forming roll set 6, the hot forming roll set 6 is used for rolling four corners which are heated by a heater and are in a plastic state into a sharp corner state, and eliminating an arc transition angle formed by cold rolling;
a shaping roller set 7, wherein the shaping roller set 7 is used for integrating the size and the shape of the square pipe rolled and formed by the hot forming roller set 6;
a straightening mechanism 8; the straightening mechanism 8 is used for performing bridge straightening on the distortion deformation of the shaped square pipe in the length direction and sending the square pipe into a subsequent cutting device for section packaging.
The heater 5 is an intermediate frequency heater, and the heating temperature is 950-1100 ℃.
The heating temperature of the intermediate frequency heating furnace is 1050 ℃.
The hot forming rollers consist of two groups, the first group of hot rolling forming rolls roll the square pipe with the side length of H +0.64t formed by the cold rollers into H +0.32t, H is the theoretical height of a finished product, t is the wall thickness of the finished product, and the second group of hot rolling forming rolls further roll the square pipe into four sides with high length and eliminate corner arcs of four corners.
The number of the shaping rollers is two groups so as to prolong the rebound time of the restraining section bar and keep the size of the section bar.
The sharp angle is a 90-degree angle or an angle smaller than 90 degrees.
The welding equipment 3 is a high-frequency welding machine.
The primary forming roll unit 2 is composed of 11 cold roll sets, four of the 11 cold roll sets are used for bending and deforming the top edge of a square pipe, and seven of the 11 cold roll sets are used for bending and deforming the two side edges of the square pipe.
The invention has the beneficial effects that:
the invention gives full play to the characteristics of the cold rolling process, creatively applies the hot forming technology and the welding technology to the cold rolling production line, solves the problem of rapid forming of the sharp-angled square pipe fitting, and has the characteristics of rapid forming speed, good quality, low cost and raw material saving.
The invention realizes the flowing of the material through thermal deformation, and supplements the inner arc material to the outer arc to realize the sharp angle treatment. The rapid forming of the sharp corner is realized by utilizing the hot-rolling forming roller.
The invention has the advantages of low investment and quick effect, and can realize the reconstruction of the production line only by adding heating, welding and cooling equipment on the original cold rolling production line. And the used roller can be changed into a small angle by repairing a large angle).
Drawings
FIG. 1 is a schematic cross-sectional view of a molded product according to an embodiment of the present invention.
FIG. 2 is a schematic view of the cold-rolling forming process of the steel strip of the present invention.
FIG. 3 is a schematic layout of the cold roll forming rolls of the present invention.
FIG. 4 is a schematic layout of the hot roll forming rolls of the present invention.
FIG. 5 is a schematic view of the hot rolled formed first and last formed product of the present invention.
FIG. 6 is a schematic diagram of the production line composition of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1-6.
A square tube vehicle sharp corner square tube production line shown in figure 1, four corners of which are right angles and can also be sharp corners smaller than 90 degrees, taking a right angle as an example, the production line of the invention comprises the following devices:
the feeding machine 1 is used for placing the cut steel strip coil on the initial end of a cold rolling production line, and is completely the same as the feeding machine of the existing cold extrusion production line;
a primary forming roll unit 2 for rolling the flat steel strip into a square tube shape step by step, wherein a seam of the square tube is positioned at the center of the uppermost edge; the structure of the primary forming roller unit is shown in fig. 3, the primary forming roller unit 2 is composed of 11 sets of cold roller sets, four sets of the 11 sets of cold roller sets are used for bending and forming the uppermost edge of a square pipe, and seven sets of cold roller sets are used for bending and forming the two side edges of the square pipe. As shown in fig. 6;
the welding equipment 3 is used for welding the abutted seams at the upper center of the square pipe together to enable the square pipe to form a closed structure, and the welding equipment is preferably a high-frequency welding machine and can be purchased from the market directly;
the water cooling equipment 4 is used for reducing the temperature of the welding seam of the welded square pipe to normal temperature so as to be carried out subsequently; the water cooling device 4 can also be realized by a conventional spraying device, and the environmental protection of wastewater treatment is only needed;
a heater 5 for heating the four corners of the square tube to raise the temperature of the four corners to a plastic deformation state; the heater 5 is preferably a medium frequency heater, and the heating temperature is 950-1100 ℃, and is more preferably 1050 ℃.
A hot forming roll set 6, the hot forming roll set 6 is used for rolling four corners which are heated by a heater and are in a plastic state into a sharp corner state, and eliminating an arc transition angle formed by cold rolling; the hot forming rollers consist of two groups, the first group of hot rolling forming rolls roll the square pipe with the side length of H +0.64t formed by the cold rollers into H +0.32t, H is the theoretical height of a finished product, t is the wall thickness of the finished product, and the second group of hot rolling forming rolls further roll the square pipe into four sides with high length and eliminate corner arcs of four corners.
A shaping roller set 7, wherein the shaping roller set 7 is used for integrating the size and the shape of the square pipe rolled and formed by the hot forming roller set 6, and the structure of the hot roller is shown in figure 4; the number of the shaping rollers is two groups so as to prolong the rebound time of the restraining section bar and keep the size of the section bar.
A straightening mechanism 8; the straightening mechanism 8 is used for performing bridge straightening on the distortion deformation of the shaped square pipe in the length direction and sending the square pipe into a subsequent cutting device for section packaging. The straightening machine mechanism and the subsequent cutting can adopt the same equipment as the existing cold extrusion production line, and independent design and purchase are not needed.
The forming method of the invention comprises the following steps:
a method for producing a square tube with sharp corners of a vehicle takes a product shown in figure 1 as an example, four corners are required to be right angles without circular arc transition, a production line used by the whole forming process is shown in figure 6, and the method comprises eight steps of material preparation, cold rolling (including eleven groups of rollers), high-frequency welding, water cooling, heating, hot rolling, shaping and correction, and specifically comprises the following steps of:
the first step, blanking, cutting the steel strip coil into steel strip coils with required width according to the size and the loss of a final formed product; the cutting equipment can be carried out by adopting the existing uncoiling equipment; the material preparation is completed, the material width can be obtained through conventional calculation, and the calculation is carried out by adopting the principle that the volume is unchanged.
Secondly, putting the cut steel strip coil on a frame, and placing the cut steel strip coil on a feeding machine at the starting end of a cold rolling production line through a coiling machine;
thirdly, enabling the steel strip to enter a first group of cold rolls through an unreeling machine or a traction machine, enabling the position of each side, which occupies 1/8 width of the steel strip, to be tilted upwards by 20 degrees by utilizing the rolling pressure of the cold rolls, and enabling the steel strip to enter a second group of cold rolls;
fourthly, rolling by a second group of cold rolls to further tilt the two tilted side edges to 40 degrees, and then further rolling in a third group of cold rolls;
fifthly, rolling by a third group of cold rolls to further tilt the two side edges tilted in the fourth step to 60 degrees, and then further rolling in a fourth group of cold rolls;
sixthly, rolling by a fourth group of cold rolls to enable the two side edges raised in the fifth step to be raised to 89 degrees, and then further rolling in a fifth group of cold rolls; the preforming of the spliced edges is completed, and the angle and the step number of the preforming can be adjusted according to equipment, materials and the like during specific implementation;
seventhly, tilting the position 3/8 of the width of each steel strip by 20 degrees through rolling of a fifth group of cold rolls, and then further rolling in a sixth group of cold rolls;
eighthly, rolling by a sixth group of cold rolls to further tilt the two tilted edges of the seventh step to 40 degrees, and then further rolling in a seventh group of cold rolls;
ninth, rolling by a seventh group of cold rolls to further tilt the two tilted sides of the eighth step to 45 degrees, and then further rolling in an eighth group of cold rolls;
step ten, rolling by an eighth cold roll group to further tilt two edges tilted in the step ninth step to 60 degrees, and then further rolling in a ninth cold roll group;
step ten, rolling by a ninth group of cold rolls to further tilt two edges tilted in the step ten to 75 degrees, and then further rolling in a tenth group of cold rolls;
step ten, rolling by a tenth cold roll group to further tilt two sides of the tilt in the step eleventh step to 85 degrees, and then further rolling in an eleventh cold roll group;
step thirteen, rolling by a group thirteen cold-rolling roller, further tilting two sides of the tilting in the step twelfth to 90 degrees, realizing folding of the square pipe, and then entering a stitch welding unit; the square pipe with the abutted seams is obtained by rolling 11 groups of cold rolling rolls, the dies used in the cold rolling process are shown in figure 3, and the shape of the blank obtained by rolling each group of cold rolling dies is shown in figure 2.
Fourteenth, performing high-frequency welding on the abutted seams of the square pipes with the gaps closed in the thirteenth step by using a high-frequency welding machine to connect the square pipes into a whole;
fifteenth step, the square tube after high-frequency welding is cooled by a water cooling unit (spray cooling can be adopted), so that the temperature difference caused by high-frequency welding is eliminated;
sixthly, enabling the square pipe cooled by the water cooling unit to enter a medium-frequency heater, and heating four corners in the direction by using the medium-frequency heater until the material is subjected to plastic deformation; the heating temperature of the intermediate frequency heater is generally controlled to be 950-1100 ℃, and is optimally 1050 ℃.
Seventeenth step, the square tube heated by the medium frequency is immediately fed into a high-temperature-resistant thermoforming roller for thermoforming, so that the materials at four corners generate plastic flow, and arc corners generated in the cold extrusion forming process from the second step to the thirteenth step are eliminated; the hot forming rollers consist of two groups, the first group of hot rolling forming rolls roll the square pipe with the side length of H +0.64t formed by the cold rollers into H +0.32t, H is the theoretical height of a finished product, t is the wall thickness of the finished product, and the second group of hot rolling forming rolls further roll the square pipe into four sides with the height and the length, and simultaneously eliminate corner arcs of four corners.
Eighteen, feeding the hot-rolled sharp-angle square tube into a shaping roller for further shaping, so that the size of the square tube is maintained; the number of the shaping rollers is two groups so as to prolong the rebound time of the restraining section bar and keep the size of the section bar.
And finally, enabling the shaped square pipe to enter a correction unit for further correction in the length direction, and cutting to obtain the required sharp-angle square pipe.
The parts not involved in the present invention are the same as or can be implemented using the prior art.
Claims (8)
1. The utility model provides a vehicle closed angle side pipe production line which characterized by includes:
the feeding machine (1) is used for placing the cut steel strip coil on the initial end of the cold rolling production line by the feeding machine (1);
a primary forming roll unit (2) for rolling the flat steel strip into a square tube shape step by step, wherein the seam of the square tube is positioned at the center of the uppermost edge;
the welding equipment (3) is used for welding the abutted seams at the upper center of the square pipe together to form a closed structure;
the water cooling equipment (4) is used for reducing the temperature of the welding seam of the welded square pipe to normal temperature so as to be added later;
a heater (5) for heating the four corners of the square tube to raise the temperature of the four corners to a plastic deformation state;
the hot forming roll set (6) is used for rolling four corners which are heated by a heater and are in a plastic state into a sharp-angled state, and eliminating arc transition angles formed by cold rolling;
the shaping roller set (7) is used for integrating the size and the shape of the square pipe rolled and formed by the hot forming roller set (6);
a corrective mechanism (8); the correcting mechanism (8) is used for carrying out bridge correction on the distortion deformation of the shaped square pipe in the length direction and sending the square pipe into a subsequent cutting device for section packaging.
2. The production line according to claim 1, characterized in that the heater (5) is a medium frequency heater and the heating temperature is 950-1100 ℃.
3. The production line as claimed in claim 2, wherein the heating temperature of the intermediate frequency heating furnace is 1050 ℃.
4. The production line as claimed in claim 1, wherein the hot forming rolls are composed of two sets, the first set of hot forming rolls roll the cold roll formed square tube with side length of H +0.64t to H +0.32t, H being theoretical height of the finished product and t being wall thickness of the finished product, and the second set of hot forming rolls further roll the square tube to four side height while eliminating four corner arcs.
5. The method of claim 1 wherein the number of shaping rolls is two to extend the time to inhibit the rebound of the profile to maintain the profile in size.
6. The production line of claim 1, wherein the sharp angle is 90 degrees or less than 90 degrees.
7. A production line as claimed in claim 1, characterized in that said welding device (3) is a high-frequency welding machine.
8. The production line of claim 1, wherein the primary forming roll unit (2) comprises 11 cold roll sets, four of the 11 cold roll sets are used for bending and forming the uppermost edge of the square tube, and seven of the 11 cold roll sets are used for bending and forming the two side edges of the square tube.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911265108 | 2019-12-11 | ||
| CN2019112651082 | 2019-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111168338A true CN111168338A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010186137.6A Pending CN111168338A (en) | 2019-12-11 | 2020-03-17 | Vehicle closed angle square tube production line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113579652A (en) * | 2021-07-29 | 2021-11-02 | 济钢集团有限公司 | Production method and production device for producing sharp-angle square tubes |
-
2020
- 2020-03-17 CN CN202010186137.6A patent/CN111168338A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113579652A (en) * | 2021-07-29 | 2021-11-02 | 济钢集团有限公司 | Production method and production device for producing sharp-angle square tubes |
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