CN109351803B - Forming method of P-shaped steel pipe - Google Patents
Forming method of P-shaped steel pipe Download PDFInfo
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- CN109351803B CN109351803B CN201811216533.8A CN201811216533A CN109351803B CN 109351803 B CN109351803 B CN 109351803B CN 201811216533 A CN201811216533 A CN 201811216533A CN 109351803 B CN109351803 B CN 109351803B
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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
- B21C37/15—Making tubes of special shape; Making tube fittings
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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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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention relates to the technical field of cold roll forming, in particular to a forming method of a P-shaped steel pipe. The method for forming the P-shaped steel pipe comprises the steps of adopting a direct squaring cold bending process for primary forming of a plate, wherein the direct squaring cold bending process comprises ten passes, and forming a straight line side welding small edge and a step side welding small edge to 46-80 degrees in the first pass to the third pass; performing straight-line side waist cold-bending forming on the fourth to eighth passes according to the angle of 15 degrees of each pass, and performing step side cold-bending forming on the fourth to eighth passes, wherein the step side cold-bending forming specifically comprises the steps of performing reverse bending forming on a first bent edge on the step side to 20-30 degrees on the fourth pass, performing second bent edge on the step side to 90 degrees on the fifth to sixth passes, and performing step side waist forming to 30 degrees on the seventh to eighth passes according to the angle of 15 degrees of each pass; and molding the straight side waist part and the step side waist part to 80-86 degrees in ninth-tenth passes. The forming method of the P-shaped steel pipe can realize the accurate forming of the P-shaped steel pipe.
Description
Technical Field
The invention relates to the technical field of cold roll forming, in particular to a forming method of a P-shaped steel pipe.
Background
The P-shaped steel pipe is specially used for manufacturing a passenger car frame, the traditional P-shaped steel pipe adopts a round-to-square forming process (as shown in figure 1), but with the further improvement of the grade of steel, the traditional P-shaped steel pipe round-to-square forming process has the problems that the section shape of a product cannot be accurately formed, secondary work hardening exists, and the secondary work hardening phenomenon increases the cracking risk of the product in the using process, especially the R-angle position. And the P-shaped steel pipe is a special-shaped product, and the precise forming of the P-shaped steel pipe cannot be realized by adopting the conventional direct forming process.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a method for forming a P-shaped steel pipe, which can realize accurate forming of the P-shaped steel pipe.
In order to achieve the purpose, the forming method of the P-shaped steel pipe comprises the following steps: the method comprises the following steps of uncoiling, feeding, shearing, butt welding, stamping steel seal, preliminary forming of a plate, extrusion welding, cooling, sizing, straightening, saw cutting, packaging and collecting and warehousing, and is characterized in that the preliminary forming of the plate adopts a direct squaring cold bending process, the direct squaring cold bending process comprises ten times, welding small edge forming procedures are carried out for the first time to the third time, step part forming procedures are carried out for the fourth time to the eighth time, and sealing forming procedures are carried out for the ninth time to the tenth time; forming the linear side welding small edge (100) and the step side welding small edge (200) to 46-80 degrees through a cold bending unit in the first to third steps; the step side cold-bending forming method comprises the following steps that the straight side waist part (300) is formed in a cold-bending mode in the fourth to eighth passes according to the angle of 15 degrees in each pass, meanwhile, the step side (400) is formed in the fourth to eighth passes in a cold-bending mode, the step side first bent edge (401) is formed in the fourth pass in a backward bending mode to be 20-30 degrees in the fifth to sixth passes in a backward bending mode, the step side second bent edge (402) is formed in the fifth to sixth passes in a 90 degree mode, and the step side waist part (403) is formed in the seventh to eighth passes in a 30 degree mode according to the angle of 15 degrees in each pass; the straight side waist portion (300) and the step side waist portion (403) are molded to 80 to 86 degrees in ninth to tenth passes.
Preferably, the direct squaring cold bending process comprises the specific processes that a straight side welding small edge (100) and a step side welding small edge (200) are molded to 70 degrees in the first to third steps according to angles of 14 degrees, 40 degrees and 70 degrees in sequence; the step side cold-bending forming method comprises the following steps that the straight side waist portion (300) is subjected to cold-bending forming in the fourth to eighth passes according to the angle of 15 degrees in each pass, meanwhile, the step side (400) is subjected to cold-bending forming in the fourth to eighth passes, the step side first bent edge (401) is subjected to reverse-bending forming to 25 degrees in the fourth pass, the step side second bent edge (402) is formed to 40 degrees in the fifth pass, the step side second bent edge (402) is formed to 90 degrees in the sixth pass, and the step side waist portion (403) is formed to 30 degrees in the seventh to eighth passes according to the angle of 15 degrees in each pass; the ninth pass molds both the straight side waist portion (300) and the stepped side waist portion (403) to 80 °, and the tenth pass molds both the straight side waist portion (300) and the stepped side waist portion (403) to 86 °.
Preferably, the fourth pass adopts a single-side reverse bending to form a first bending edge (401) at the step side, and the bending angle is set to be 3-5 degrees. The single-pass single-side reverse bending forming process ensures that the forming process is effective, the resilience is reduced, and compared with the traditional 2-degree bending angle, the bending angle is larger than the traditional bending angle, the resilience is reduced, and the effective forming is ensured.
Preferably, the step side forming is completed in the fourth to eighth passes by pressing with oblique insert rollers.
As a preferred scheme, the extrusion welding process adopts a four-roller extrusion mode, and the lower rollers adopt a wrapped arc design; the welding adopts the asymmetric welding mode, and the welding allowance of the P-shaped pipe is 1.0-1.2 times of the wall thickness of the P-shaped pipe. The invention improves the control capability of the asymmetric welding process through the extrusion welding process, ensures the welding stability, and ensures no pit-shaped planed mark of the outer burrs of the steel strip by adopting a four-roller extrusion mode.
Preferably, the sizing process adopts a sizing mode of combining four frames of standard rollers and one frame of drum rollers, and the standard rollers, the drum rollers, the standard rollers and the standard rollers are arranged in sequence. The high-strength steel has high strength, the strength is increased after the high-strength steel is processed and hardened, the rebound phenomenon is aggravated, and the size and the flatness control are effectively realized by a sizing mode combining four times of standard rollers and one time of drum rollers.
Preferably, the straightening process adopts four passes of Turkish heads for straightening. And the Turkish head is straightened by adopting four times, so that the torsion value is reduced, and the torsion control is ensured.
The invention has the advantages that: compared with the traditional round-to-square forming process (shown in figure 1) of the P-shaped steel pipe, the invention adopts the direct square-to-cold-bending process (shown in figure 2). The invention discloses a method for forming a P-shaped steel pipe circular plate material, which adopts a three-five forming method in a preliminary forming stage, specifically, the three-five forming method comprises three-pass welding small edge forming, five-pass step part forming and two-pass closed forming, and the accurate forming of the P-shaped steel pipe is completed through the control of forming angles of all passes. In addition, the invention only has the phenomenon of one-time work hardening, thereby avoiding the product quality risk caused by excessive loss of plasticity.
Drawings
FIG. 1 is a schematic view of a conventional round-to-square process;
FIG. 2 is a flow chart of a direct squaring process of the present invention;
FIG. 3 is a schematic view of a roll flower in the preliminary forming stage of the plate in the forming method of the P-shaped steel tube of the present invention; in the figure, 1-12 represent rolling passes;
FIG. 4 is a schematic deformation diagram of each pass of the preliminary forming stage of the plate in the forming method of the P-shaped steel tube; in the figure, 1-12 represent rolling passes;
FIG. 5 is a schematic diagram of oblique insert roller forming in the preliminary sheet forming stage in the P-shaped steel tube forming method of the present invention;
FIG. 6 is a schematic cross-sectional view of a P-shaped steel pipe of the present invention; among them, a straight-line side welding small edge 100, a step side welding small edge 200, a straight-line side waist portion 300, a step side 400 (a step side first bead 401, a step side second bead 402, a step side waist portion 403), and a welding point 500.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.
In order to solve the problems that the existing high-strength P-shaped steel pipe forming method cannot be precisely formed and the risk of product cracking is high, the invention provides a P-shaped steel pipe forming method. Hereinafter, preferred embodiments of the method for forming a P-shaped steel pipe according to the present invention will be described in detail by way of specific examples.
The forming method of the P-shaped steel pipe comprises the following steps: 1) uncoiling, 2) feeding, 3) shearing, 4) butt welding, 5) stamping a steel seal, 6) preliminary forming of a plate, 7) extrusion welding, 8) cooling, 9) sizing, 10) straightening, 11) sawing, 12) packing and collecting, and 13) warehousing;
as shown in fig. 3, 4 and 6, the step 6) of preliminary forming of the plate includes 10 passes, specifically, a three-five forming method is adopted, the three-five forming method includes three-pass welding small edge forming, five-pass step part forming and two-pass sealing forming, and the angle control of the preliminary forming of the plate is shown in table 1:
TABLE 1
In the rolling process, a single-side reverse bending is adopted for forming the first bending edge 401 at the step side in the fourth pass, and the passing bending angle is set to be 4 degrees. As shown in fig. 5, the step side 400 is formed by pressing with oblique rollers in the fourth to eighth passes.
As shown in fig. 3 and 4, the 11 th step is performed by the extrusion welding process of step 7), in which welding is performed at a welding point 500, and the welding is performed by an asymmetric welding method. In the extrusion welding forming process, a four-roller extrusion mode is adopted for welding, and the lower roller adopts an arc wrapping design, so that the control capability of the asymmetric welding process is improved, and the welding stability is ensured. Wherein the welding allowance of the P-shaped pipe is 1.2 times of the wall thickness of the P-shaped pipe.
And (3) after the extrusion welding forming is finished, cooling the P-shaped steel pipe in the step 8) to avoid the generation of quenched martensite, wherein the cooling step adopts a mode of combining air cooling and water cooling.
And after the cooling step is finished, carrying out sizing in the step 9) on the P-shaped steel pipe, wherein the sizing process adopts a sizing mode of combining four standard rollers and one drum roller, and the standard rollers, the drum rollers, the standard rollers and the standard rollers are arranged in sequence. Wherein the drum-shaped roller convexity is designed according to 10% of the corresponding side length.
And (3) straightening the P-shaped steel pipe in the step 10) after the sizing is finished, wherein the straightening process adopts four passes of Turkish heads for straightening. The traditional two-pass Turkish head straightening is distinguished, and the four-pass Turkish head straightening is adopted, so that the distortion value is reduced, and the torsion control is ensured.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. A forming method of a P-shaped steel pipe comprises the following steps: the method comprises the following steps of uncoiling, feeding, shearing, butt welding, stamping steel seal, preliminary forming of a plate, extrusion welding, cooling, sizing, straightening, saw cutting, packaging and collecting and warehousing, and is characterized in that the preliminary forming of the plate adopts a direct squaring cold bending process, the direct squaring cold bending process comprises ten times, welding small edge forming procedures are carried out for the first time to the third time, step part forming procedures are carried out for the fourth time to the eighth time, and sealing forming procedures are carried out for the ninth time to the tenth time; forming the linear side welding small edge (100) and the step side welding small edge (200) to 46-80 degrees through a cold bending unit in the first to third steps; the cold bending forming of the straight side waist part (300) is carried out in the fourth to eighth passes according to the angle of 15 degrees of each pass, meanwhile, the cold bending forming of the step side (400) is carried out in the fourth to eighth passes, the cold bending forming of the step side (400) is specifically carried out in the process that the first bent edge (401) of the step side is reversely bent and formed to 20-30 degrees in the fourth pass, the single-side reverse bending forming of the first bent edge (401) of the step side is adopted in the fourth pass, the passing angle is set to 3-5 degrees, the second bent edge (402) of the step side is formed to 90 degrees in the fifth to sixth passes, and the step side waist part (403) is formed to 30 degrees in the seventh to eighth passes according to the angle of 15 degrees of each pass; the straight side waist portion (300) and the step side waist portion (403) are molded to 80 to 86 degrees in ninth to tenth passes.
2. The method of forming a P-shaped steel pipe according to claim 1, wherein: the direct squaring cold bending process comprises the specific process that a straight side welding small edge (100) and a step side welding small edge (200) are molded to 70 degrees in the first to third steps according to angles of 14 degrees, 40 degrees and 70 degrees in sequence; the step side cold-bending forming method comprises the following steps that the straight side waist portion (300) is subjected to cold-bending forming in the fourth to eighth passes according to the angle of 15 degrees in each pass, meanwhile, the step side (400) is subjected to cold-bending forming in the fourth to eighth passes, the step side first bent edge (401) is subjected to reverse-bending forming to 25 degrees in the fourth pass, the step side second bent edge (402) is formed to 40 degrees in the fifth pass, the step side second bent edge (402) is formed to 90 degrees in the sixth pass, and the step side waist portion (403) is formed to 30 degrees in the seventh to eighth passes according to the angle of 15 degrees in each pass; the ninth pass molds both the straight side waist portion (300) and the stepped side waist portion (403) to 80 °, and the tenth pass molds both the straight side waist portion (300) and the stepped side waist portion (403) to 86 °.
3. The method of forming a P-shaped steel pipe according to claim 1, wherein: and the step side (400) molding is completed in the fourth to eighth passes by adopting the inclined insertion roller to apply pressure.
4. The method of forming a P-shaped steel pipe according to claim 1, wherein: the extrusion welding process adopts a four-roller extrusion mode, and the lower rollers adopt a wrapped arc design; the welding adopts an asymmetric welding mode, and the welding allowance of the P-shaped steel pipe is 1.0-1.2 times of the wall thickness of the P-shaped pipe.
5. The method of forming a P-shaped steel pipe according to claim 1, wherein: the sizing process adopts a sizing mode of combining four sets of standard rollers and one set of drum rollers, and the standard rollers, the drum rollers, the standard rollers and the standard rollers are arranged in sequence.
6. The method of forming a P-shaped steel pipe according to claim 1, wherein: the straightening process adopts four passes of Turkish heads to straighten.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811216533.8A CN109351803B (en) | 2018-10-18 | 2018-10-18 | Forming method of P-shaped steel pipe |
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| CN201811216533.8A CN109351803B (en) | 2018-10-18 | 2018-10-18 | Forming method of P-shaped steel pipe |
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| CN109351803A CN109351803A (en) | 2019-02-19 |
| CN109351803B true CN109351803B (en) | 2020-05-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109998303B (en) * | 2019-04-20 | 2024-01-09 | 南京世岐货架型材制造有限公司 | Edge-locking P-shaped beam and forming machine |
| CN113118231B (en) * | 2021-04-21 | 2023-05-09 | 中冶赛迪技术研究中心有限公司 | General technology for producing closed section steel through hot roll bending |
| CN113579658B (en) * | 2021-08-06 | 2023-10-17 | 四川攀钢嘉德精工科技有限公司 | Steel plate deformation process |
| CN113967672B (en) * | 2021-09-30 | 2023-08-29 | 武汉钢铁江北集团冷弯型钢有限公司 | Forming method of right trapezoid-section steel pipe |
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Patent Citations (6)
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| CN1814402A (en) * | 2005-02-05 | 2006-08-09 | 上海申花钢管有限公司 | Method for working complex section steel pipe by high-frequency resistance welding continuous roll type cold bending |
| CN101708514A (en) * | 2009-12-17 | 2010-05-19 | 上海佳冷型钢有限公司 | Method for processing open-web sharp-angled rhomboid tube |
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