CN111229860A - Method for forming vehicle sharp-corner square tube - Google Patents
Method for forming vehicle sharp-corner square tube Download PDFInfo
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- CN111229860A CN111229860A CN202010185896.0A CN202010185896A CN111229860A CN 111229860 A CN111229860 A CN 111229860A CN 202010185896 A CN202010185896 A CN 202010185896A CN 111229860 A CN111229860 A CN 111229860A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/08—Making tubes with welded or soldered seams
- B21C37/0803—Making tubes with welded or soldered seams the tubes having a special shape, e.g. polygonal tubes
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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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
A method for forming a vehicle sharp-corner square tube comprises eight steps of material preparation, cold rolling (including eleven groups of rollers), high-frequency welding, water cooling, heating, hot rolling, shaping and correction. 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 method for forming a vehicle sharp-angled square tube.
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 process to solve the processing problem of the sharp-angled 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 method for forming the vehicle sharp-angle square tube by combining cold rolling, welding and hot forming technologies.
The technical scheme of the invention is as follows:
a method for forming a sharp-corner square tube of a vehicle is characterized by comprising the following steps:
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;
secondly, putting the cut steel strip coil on a loading machine of a cold rolling production line;
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 is wider than 1/8, 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;
seventhly, tilting the steel strip at the position with the width of 3/8 degrees on each side by rolling through 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;
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, cooling the square tube subjected to high-frequency welding through a water cooling unit to eliminate temperature difference caused by high-frequency welding;
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;
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;
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;
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 heating temperature of the intermediate frequency heater is 950 ℃ and 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 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 repeatedly used by repairing (changing a large angle into a small 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 method for forming 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 in 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 is wider than 1/8, 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 steel strip at the position with the width of 3/8 degrees on each side by rolling through 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 950 ℃ and 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 (6)
1. A method for forming a sharp-corner square tube of a vehicle is characterized by comprising the following steps:
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;
secondly, putting the cut steel strip coil on a loading machine of a cold rolling production line;
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 is wider than 1/8, 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;
seventhly, tilting the steel strip at the position with the width of 3/8 degrees on each side by rolling through 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;
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, cooling the square tube subjected to high-frequency welding through a water cooling unit to eliminate temperature difference caused by high-frequency welding;
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;
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;
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;
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.
2. The method as claimed in claim 1, wherein the heating temperature of the intermediate frequency heater is 950 ℃ and 1100 ℃.
3. The method as claimed in claim 2, wherein the heating temperature of the intermediate frequency heating furnace is 1050 ℃.
4. The method of claim 1, wherein the hot forming rolls are comprised of two sets, a first set of hot forming rolls rolling the cold roll formed square tube having a side length of H +0.64t to H +0.32t, H being the theoretical height of the finished product and t being the wall thickness of the finished product, and a second set of hot forming rolls further rolling the square tube to a four-sided 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 method of claim 1, wherein the sharp angle is 90 degrees or less than 90 degrees.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019112650997 | 2019-12-11 | ||
| CN201911265099 | 2019-12-11 |
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| Publication Number | Publication Date |
|---|---|
| CN111229860A true CN111229860A (en) | 2020-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010185896.0A Pending CN111229860A (en) | 2019-12-11 | 2020-03-17 | Method for forming vehicle sharp-corner square tube |
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Cited By (2)
| 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 |
| CN114749482A (en) * | 2022-04-12 | 2022-07-15 | 南京图信新材料科技有限公司 | Section steel forming machine for track and track production and manufacturing method |
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|---|---|---|---|---|
| DE4442434C1 (en) * | 1994-11-29 | 1995-10-05 | Welser Ohg Josef | Method for mfr. of rolled hollow plate profiles |
| CN1644473A (en) * | 2005-01-21 | 2005-07-27 | 上海俊昌钢管有限公司 | Rectangular and square structure of members and forming process for container |
| CN2771137Y (en) * | 2005-01-21 | 2006-04-12 | 上海俊昌钢管有限公司 | Rectangle, square member structure for container |
| CN102699107A (en) * | 2012-06-19 | 2012-10-03 | 武汉钢铁(集团)公司 | Cold roll forming method of thin-walled and high-strength square steel tube |
| CN202824102U (en) * | 2012-08-06 | 2013-03-27 | 天津市津舜钢管制造有限公司 | Angle iron production line |
| CN105107866A (en) * | 2015-07-23 | 2015-12-02 | 上海宝钢型钢有限公司 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
-
2020
- 2020-03-17 CN CN202010185896.0A patent/CN111229860A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4442434C1 (en) * | 1994-11-29 | 1995-10-05 | Welser Ohg Josef | Method for mfr. of rolled hollow plate profiles |
| CN1644473A (en) * | 2005-01-21 | 2005-07-27 | 上海俊昌钢管有限公司 | Rectangular and square structure of members and forming process for container |
| CN2771137Y (en) * | 2005-01-21 | 2006-04-12 | 上海俊昌钢管有限公司 | Rectangle, square member structure for container |
| CN102699107A (en) * | 2012-06-19 | 2012-10-03 | 武汉钢铁(集团)公司 | Cold roll forming method of thin-walled and high-strength square steel tube |
| CN202824102U (en) * | 2012-08-06 | 2013-03-27 | 天津市津舜钢管制造有限公司 | Angle iron production line |
| CN105107866A (en) * | 2015-07-23 | 2015-12-02 | 上海宝钢型钢有限公司 | Thermal shaping method and device of high-strength sharp-corner square rectangular tube |
Cited By (3)
| 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 |
| CN114749482A (en) * | 2022-04-12 | 2022-07-15 | 南京图信新材料科技有限公司 | Section steel forming machine for track and track production and manufacturing method |
| CN114749482B (en) * | 2022-04-12 | 2024-05-17 | 南京图信新材料科技有限公司 | Profile steel forming machine for rail and rail production and manufacturing method |
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