WO2019198805A1 - 角管成形方法及び装置 - Google Patents
角管成形方法及び装置 Download PDFInfo
- Publication number
- WO2019198805A1 WO2019198805A1 PCT/JP2019/015917 JP2019015917W WO2019198805A1 WO 2019198805 A1 WO2019198805 A1 WO 2019198805A1 JP 2019015917 W JP2019015917 W JP 2019015917W WO 2019198805 A1 WO2019198805 A1 WO 2019198805A1
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- WIPO (PCT)
- Prior art keywords
- roll stand
- roll
- square tube
- stand
- flat roll
- Prior art date
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Classifications
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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
- B21C37/155—Making tubes with non circular section
-
- 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
- B21D15/00—Corrugating tubes
- B21D15/02—Corrugating tubes longitudinally
-
- 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
-
- 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
-
- 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
- B21C37/16—Making tubes with varying diameter in longitudinal direction
-
- 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
- B21D5/06—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles
- B21D5/10—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes
- B21D5/12—Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
Definitions
- the present invention relates to a square tube forming method and apparatus for forming a metal round tube into a square tube, and more particularly to a forming roll type square tube forming method and apparatus using a multi-stage forming roll stand.
- the square tube means a metal square tube.
- caliber rolls are used for both horizontal rolls and vertical rolls.
- the caliber roll is a forming roll whose outer peripheral surface is recessed in a deep arc shape as it goes from the both end portions in the rotation axis direction to the center portion, and the arc-shaped recess is a roll caliber.
- the roll caliber in each stand is designed to gradually become shallower from the upstream side to the downstream side in the material traveling direction, and more specifically, the curvature of the roll caliber is , Gradually decreases from a value close to the curvature of the round tube, which is the raw tube, so that it finally becomes 0, which is the same as the straight portion sandwiched between the corners of the square tube, which is the product Designed.
- horizontal roll stands and vertical roll stands are alternately arranged close to each other in order to improve the formability by suppressing the spring back of the tube material between adjacent rolls. They are trying to use each other's molding power.
- the roll caliber of the forming roll is divided into the part in charge of the corner, the part in charge of the shoulder, the part in charge of the straight part other than the shoulder in the circumferential direction, and a different curvature is given to each part in charge.
- the roll caliber is designed so that the bottom of the caliber of the forming roll comes into limited contact with the central portion of the straight portion of the product square tube.
- pipes of different sizes can be formed in the same stand row, but the combined range is limited, and the development of a rectangular tube forming apparatus having a wider roll-compatible property is awaited.
- the curvature of the cross-section R of the corner portion including the structural steel pipe is accurate as prescribed, that is, there is no increase or decrease in thickness.
- the square tube forming machine adopts a small-diameter forming roll for the purpose of narrowing the space between adjacent horizontal rolls and vertical rolls.
- the square tube forming apparatus presented by Patent Document 2 relatively high dimensional accuracy is ensured by the combination of the multiple curvatures in the roll caliber described above, but on the other hand, the caliber roll is more exclusive. It is inevitable that the roll compatibility is sacrificed.
- the present invention enables wide-ranging rolls that can be incorporated into modern pipe manufacturing lines and the suppression of the overall length of the roll stand row. Further, it is difficult to increase or decrease the thickness of the product corners, and formability
- An object of the present invention is to provide a square tube forming method and a square tube forming apparatus excellent in the above.
- the present inventors have combined a flat roll stand having a rod-shaped flat roll having no roll caliber, and in particular, a horizontal flat roll stand and a vertical flat roll stand are alternately arranged along the tube forming direction.
- the flat roll is not recessed in an arc shape like the caliber roll, so the minimum outer diameter and the maximum outer diameter are substantially equal, and the distance between the roll stands can be reduced compared to the caliber roll stand. it can.
- the overall length of the roll stand row is suppressed, and roll compatibility is significantly improved as compared to the caliber roll stand row.
- the horizontal roll stand and the vertical roll stand are alternately arranged, which basically results in bending with a two-sided roll, like drawing with a four-way roll. It is possible to prevent distortion at the corners. And since the forming roll in each roll stand is a flat roll in which the maximum diameter is suppressed, it is true that the interval between the roll stands can be reduced, but the interval between the roll stands can be temporarily reduced. Even so, the spring back of the pipe material between the adjacent roll stands cannot be suppressed.
- the flat roll stand is very effective for performing such operations. This is because, in the case of a caliber roll having a roll caliber, the outer diameter of both ends is larger than that of the caliber bottom portion in contact with the pipe material, and the change in roll interval and reduction amount is limited by the maximum diameter portion. On the other hand, in the case of a flat roll having substantially no roll caliber, the change range of the roll interval is large, and the reduction amount can be adjusted over a wide range, so that it is particularly effective for forming a square tube.
- the square tube forming method and apparatus of the present invention have been developed on the basis of such knowledge, and the square tube forming method includes a plurality of roll stands arranged along a raw tube forming direction, A square tube forming method of forming a round tube of various dimensions as a product by passing a round tube of various diameters,
- the first flat roll stand and the second flat roll stand whose rolling directions are orthogonal to each other are alternately arranged along the tube forming direction, and a flat roll stand row in which the rolling amount in each roll stand can be set independently,
- the distribution of the molding reduction amount from the first stage stand to the last stage stand, which is selected in advance according to the outer diameter, thickness and material of the raw pipe to be used, and the dimensions of the planned product square tube Distribute individually as the amount of reduction in each roll stand,
- at least one of the first flat roll stand and the second flat roll stand adjacent to each other is driven to form the molding target tube into a product square tube having a predetermined size.
- the square tube forming apparatus of the present invention is a square tube forming apparatus for carrying out the square tube forming method of the present invention
- the first flat roll stand and the second flat roll stand that are perpendicular to the rolling direction are provided with a flat roll stand row that is alternately arranged along the molding direction.
- Each roll stand in the flat roll stand row has roll interval adjusting means capable of independently setting the amount of reduction, and has roll drive means in at least one of the adjacent first flat roll stand and second flat roll stand. ing.
- the roll stand row is a flat roll stand row
- the molding material is a raw material tube.
- the angle with respect to the vertical line and the horizontal line in the individual reduction direction is not limited. From the viewpoint of reality, it is preferable that one is a horizontal roll stand and the other is a vertical roll stand.
- both the horizontal roll and the vertical roll are driven, square tubes having different rectangular ratios can be formed. Although both rolls can be driven by only a part of the stands, it is reasonable and desirable to drive only one of all the stands from the viewpoint of rationalization of the device structure and reduction of the device manufacturing cost.
- the flat roll in each roll stand is basically one whose outer diameter is constant over the entire length in the rotation axis direction, but in some roll stands, particularly one or a plurality of continuous roll stands in a part of the roll stand row, It is within the scope of the present invention to provide shallow arc-shaped recesses having a curvature larger than the outer surface R on the roll contact surface of the pipe material passing through the roll stand, regardless of whether it is driven or not.
- This arc-shaped recess on the outer peripheral surface of the drive roll in a section that requires a large propulsive force with respect to the pipe material, for example, in the upstream part of the roll stand row, a large propulsive force can be obtained.
- a similar arc-shaped recess on the outer peripheral surface the tube material can be smoothly promoted and formed.
- the roll interval adjustment mechanism in the roll stand row should share the interval adjustment motor with the roll stand row. Specifically, a plurality of sets of first flat rolls can be moved along a roll stand row so that a set of spacing adjusting motors for a set of adjacent first flat roll stands and second flat roll stands can be moved. It is good to share between the stand and the second flat roll stand. This simplifies the device structure and reduces the device weight, thereby reducing the device manufacturing cost.
- the basics are the square tube forming by the caliber roll stand row, that is, in each stand. This is a technology that gradually reduces the curvature of a roll caliber and roll-forms a circular tube, which is a raw tube, into a square tube, which is a product.
- the total forming amount is distributed almost equally in all stages according to the number of stands used, and based on this, the caliber curvature at each stand is designed, As for the reduction amount at each stand, the total reduction amount is distributed equally to each stand in a form corresponding to the caliber curvature distribution.
- the square tube forming method and apparatus of the present invention uses a roll stand row in which first flat roll stands and second flat roll stands whose rolling directions are orthogonal to each other are arranged alternately along the forming direction, and on the forming dimensions of the roll caliber. Since the restriction is removed, roll compatibility is very high. In addition to suppressing the overall length of the flat roll stand row by reducing the distance between adjacent flat roll stands, the sizing stand (four-way roll stand) for securing thrust, which was required in the past, is no longer necessary, making it easy to modernize Can be incorporated into the pipe manufacturing line. For these reasons, square tubes of various dimensions can be formed from round tubes of various diameters, more specifically, various dimensions (outer diameter, wall thickness) and materials.
- the roll roll is extremely versatile due to the flat roll, and the amount of reduction of each stand in the stand row can be set independently, and the amount of reduction can be freely distributed. Therefore, even when the amount of reduction is large, the molding amount per roll stand is small, and the winding resistance to the roll is reduced because the winding around the roll is reduced.
- the molding amount per roll stand is small, and the winding resistance to the roll is reduced because the winding around the roll is reduced.
- at least one of the adjacent first flat roll stand and second flat roll stand is driven to give a stable propulsive force to the tube material passing through the stand row. By doing so, there is no need for a sizing stand (four-way roll stand) to secure thrust.
- a sizing stand four-way roll stand
- the square tube forming method and apparatus of the present invention can economically manufacture a high quality square tube.
- the square tube forming apparatus of the present embodiment is an apparatus for continuously forming a round tube, which is a forming material, through a plurality of forming roll stands in order to form a square tube, and is arranged in a round tube production line.
- the square tube forming apparatus includes a roll stand row 10 having a rectangular tube shape that is long in the tube forming direction.
- the rectangular tube-shaped roll stand array 10 includes a square frame-shaped horizontal roll stand 20A having a thin thickness in the tube forming direction and a square frame-shaped vertical roll stand 20B having a small thickness in the tube forming direction on the stand base 30.
- the round tube which is a shaping
- the horizontal roll stand 20A is arranged between the upper and lower fixed horizontal bases 22A and 22A and the upper and lower fixed horizontal bases 22A and 22A.
- the upper and lower horizontal movable bases 23A and 23A supported by the left and right vertical rods 21A so as to be movable in the vertical direction, and the upper and lower horizontal rolls 24A and 24A attached to the opposing surfaces of the movable bases 23A and 23A, respectively. ing.
- Each of the upper and lower horizontal rolls 24A is a flat roll having a substantially constant outer diameter over the entire length in the central axis direction, and horizontal support shafts that support the horizontal roll 24A are brackets with built-in bearings on both sides of the horizontal roll 24A.
- 25A and 25A are rotatably supported, and one end portion of the support shaft protrudes as one input shaft 24A 'to one side of the roll stand row 10 and roll drive as roll drive means disposed on one side thereof. By being connected to the mechanism 40, it is rotationally driven (see FIG. 1).
- a pair of upper and lower horizontal rolls 24A, 24A are provided with a mechanical upper jack 26A mounted downward on the upper surface of the central portion of the upper fixed horizontal base 22A, and upward on the lower surface of the central portion of the lower fixed horizontal base 22A.
- the roll interval is adjusted by the attached mechanical lower jack 26A.
- the downward-facing upper jack 26A passes through the upper fixed horizontal base 22A and is coupled to the upper surface of the upper movable base 23A, and is used for a horizontal roll disposed on one side of the roll stand row 10. It is driven via a horizontal input shaft 27A by an interval adjusting motor 50A (see FIGS. 1 and 2). Further, the upward downward jack 26A has a tip portion passing through the lower fixed horizontal base 22A and coupled to the lower surface of the lower movable base 23A.
- the horizontal roll interval adjusting motor 50A (see FIGS. 1 and 2).
- the symmetrical movement of the upper and lower jacks 26A and 26A causes the upper and lower movable bases 23A and 23A to be driven up and down symmetrically to adjust the roll interval between the upper and lower horizontal rolls 24A and 24A. That is, the distance between the upper and lower horizontal rolls 24A and 24A is adjusted by the upper and lower jacks 26A and 26A, the horizontal roll interval adjusting motor 50A, the input shaft 27A as the power transmission mechanism, the upper and lower gear boxes 28A and 28A, and the power transmission shaft 29A.
- the mechanism is configured.
- the vertical roll stand 20B includes a pair of left and right fixed vertical bases 21B and 21B, two upper and lower horizontal rods 22B and 22B connecting the left and right fixed vertical bases 21B and 21B, and left and right fixed vertical bases. Between the bases 21B and 21B, the left and right movable bases 23B and 23B supported by the two upper and lower horizontal rods 22B and 22B so as to be movable in the horizontal direction, and the left and right movable bases 23B and 23B are rotatably supported, respectively. Left and right vertical rolls 24B and 24B are provided.
- the left and right fixed vertical bases 21B and 21B are provided symmetrically on both ends of the horizontal fixed base 22A (see FIG. 3) below the horizontal roll stand 20A. That is, the horizontal fixing base 22A on the lower side of the horizontal roll stand 20A described above extends to the downstream side of the roll stand row 10, and the vertical fixing bases 21B and 21B are attached on the extending portions. As a result, a pair of adjacent horizontal roll stand 20A and vertical roll stand 20B constitutes a pair of horizontal and vertical stands 20 integrated by a common horizontal fixed base 22A.
- the left and right movable bases 23B have upper and lower sliders slidably supported by upper and lower horizontal rods 22B and 22B, and a roll support frame 25B attached between the upper and lower sides.
- the roll support frame 25B which also serves as a connecting member for the upper and lower sliders, has a structure that is opened to the inside by combining the upper and lower horizontal members and the outer vertical member, and the left and right vertical rolls 24B and 24B are interposed between the upper and lower horizontal members. Is supported rotatably.
- the left and right vertical rolls 24B and 24B have their roll intervals adjusted by left and right jacks 26B and 26B attached to the outer surfaces of the left and right vertical fixed bases 22B and 22B, respectively.
- the jack 26B on one side has a tip portion that passes through the fixed vertical base 22B on one side and is coupled to the outer surface of the vertical member on the outer side of the movable base 23B on one side. Is driven via a vertical input shaft 27B by a vertical roll interval adjusting motor 50B (see FIGS. 1 and 2) disposed on one side of the vertical roll.
- the other side of the jack 26B has a tip portion passing through the fixed vertical base 22B on the other side and coupled to the outer surface of the vertical member outside the movable base 24B on the other side.
- Driving force by the distance adjusting motor 50B see FIGS.
- the left and right movable bases 23B and 23B are horizontally moved symmetrically, and the distance between the left and right vertical rolls 24B and 24B is adjusted. That is, the left and right jacks 26B and 26B, the vertical roll interval adjusting motor 50B, the input shaft 27B as the power transmission mechanism, the left and right gear boxes 28B and 28B, and the power transmission shaft 29B are spaced apart from the left and right vertical rolls 24B and 24B.
- An adjustment mechanism is configured.
- the roll stand row 10 in the tube forming apparatus is configured. More specifically, the roll stand row 10 is composed of 11 sets of stand pairs 20 (a total of 23 roll stands including the horizontal roll stand 20A in the final stage).
- the interval between the horizontal rolls 24A and 24A in the horizontal roll stand 20A is adjusted by the horizontal roll interval adjusting motor 50A, and the interval between the vertical rolls 24B and 24B in the vertical roll stand 20B is vertical. It is adjusted by the roll interval adjusting motor 50B.
- the horizontal roll interval adjusting motor 50A and the vertical roll interval adjusting motor 50B is provided corresponding to one horizontal / vertical stand pair 20, and the one set of horizontal roll interval adjusting motor 50A and The vertical roll interval adjusting motor 50B moves along the roll stand row 10 (self-propelled here), so that the horizontal rolls 24A and 24A and the vertical rolls 24B and 24B in the 12 horizontal / vertical stand pairs 20 are separated. Are adjusted sequentially.
- a support base 51 is provided over the entire length of the roll stand row 10 on one side of the roll stand row 10, particularly on the uppermost part thereof.
- the support base 51 is supported horizontally by a stay 52 or the like extending from the uppermost part of the stand set 20 to one side.
- the pair of horizontal roll interval adjustment motors 50A and vertical roll interval adjustment motors 50B are connected to each other, and can move along the roll stand row 10 on the support base 51 in this state.
- one set of horizontal roll interval adjusting motor 50A and vertical roll interval adjusting motor 50B stop at positions corresponding to each of the 12 sets of horizontal / vertical stand pairs 20, and at each stop position, By being connected to the horizontal input shaft 27A and the vertical input shaft 27A in the vertical roll stand 20B, respectively, the distance between the horizontal rolls 24A and 24A in the horizontal roll stand 20A and the vertical roll 24B in the vertical roll stand 20B. , 24B are adjusted.
- Reference numeral 53 denotes a flexible cable for supplying power to the movable horizontal roll interval adjusting motor 50A and the vertical roll interval adjusting motor 50B.
- the horizontal rolls 24A and 24A in the horizontal roll stand 20A are rotationally driven by the roll drive mechanism 40 disposed on one side of the roll stand row 10.
- the roll drive mechanism 40 is divided into three drive units 41.
- Each drive unit 41 is connected to four horizontal roll stands 20A in the four pairs of adjacent stands 20 in the roll stand row 10, thereby rotating the upper and lower horizontal rolls 24A, 24A in the four horizontal roll stands 20A. To drive.
- the roll drive mechanism 40 has a drive motor 42 that drives each drive unit 41, and the upper and lower output shafts 43, 43 corresponding to the four horizontal roll stands 20A are connected to the four horizontal roll stands.
- the four horizontal roll stands 20A are made into a set, and the upper and lower horizontal rolls 24A and 24A in each horizontal roll stand 20A are rotated. To drive.
- An extremely shallow arc-shaped recess having a larger curvature than the outer surface R of the pipe material to be formed is formed.
- a plurality of sets (here 12 sets) of horizontal and vertical stand pairs 20 that is, in the combination of the horizontal roll stand 20A and the vertical roll stand 20B), the distance between the upper and lower horizontal rolls 24A and 24A in the horizontal roll stand 20A and the distance between the left and right vertical rolls 24B and 24B in the vertical roll stand 20B are set, for example, Adjustment is made for each stand pair 20 from the upstream side to the downstream side of the row 10. As described above, this adjustment is performed by a combination of the movable horizontal roll interval adjusting motor 50A and the vertical roll interval adjusting motor 50B.
- the roll drive mechanism 40 causes the Only the horizontal rolls 24A and 24A in the horizontal roll stand 20A are rotationally driven.
- a round tube as a molding material is passed through the roll stand row 10.
- the tube material is formed into a square tube from a round tube by sequentially passing through a pair of stands 20 in the roll stand row 10 (that is, a combination of a horizontal roll stand 20A and a vertical roll stand 20B).
- the roll stand row 10 has a configuration in which horizontal roll stands 20A and vertical roll stands 20B are alternately arranged, and the horizontal rolls 24A and 24A in the horizontal roll stand 20A and the vertical rolls 24B in the vertical roll stand 20B.
- 24B is a flat roll whose outer diameter is substantially constant over the entire length in the central axis direction. For these reasons, not only the distance between adjacent stands is reduced, but also it is easy to avoid roll interference between adjacent stands. It can be adjusted. Moreover, even if the interval between adjacent stands is reduced, a relatively large diameter flat roll can be used, so that the winding of the pipe material around the roll and the increase of the penetration resistance due to this are avoided.
- the outer diameter, material, thickness, etc. of the molding material are increased such that the reduction amount at a specific position of the roll stand row 10, for example, a partial stand on the upstream side is increased, and the reduction amount is gradually reduced at others. It is possible to set a formability-oriented reduction amount distribution in consideration of the changing springback amount.
- the tube material penetration resistance is essentially suppressed to be small, and the horizontal rolls 24 ⁇ / b> A and 24 ⁇ / b> A are rotationally driven in all the horizontal roll stands 20 ⁇ / b> A so Since the propulsive force is added to the entire length, the amount of reduction at a specific position of the roll stand row 10 is increased, and as a result, the springback is increased, and the pipe material passes smoothly through the roll stand row 10.
- each horizontal roll stand is used in a partial stand on the upstream side that increases the amount of reduction (here, two sets of horizontal and vertical stands 20 are possible, but more than that).
- An extremely shallow arc-shaped recess having a larger curvature than the roll contact surface R of the tube material passing between the rolls is formed on the outer peripheral surfaces of the horizontal rolls 24A and 24A in 20A and the vertical rolls 24B and 24B in each vertical roll stand 20B. Therefore, a particularly large driving force is added to the pipe material passing through each stand.
- the arc-shaped concave portions are provided in the horizontal rolls 24A and 24A in the horizontal roll stand 20A and the vertical rolls 24B and 24B in the vertical roll stand 20B on the upstream side of the roll stand row 10 so that the pipe material is rolled into the roll stand row.
- the force drawn into 10 is strengthened, and a smoother passage of the tube material becomes possible.
- the pipe material passing through the roll stand row 10 is subjected to bending from two directions by the flat horizontal rolls 24A and 24A and the flat vertical rolls 24B and 24B, thereby forming a corner portion. Therefore, moldability is improved and high quality square tubes are manufactured. Specifically, a square tube having a predetermined cross-sectional curvature is produced without thinning at the corners. The fact that no thinning occurs at the corners means that it is not necessary to assume the occurrence of thinning in the dimensions of the forming tube, and the effect of reducing the diameter of the main pipe, or the thickness of the round tube and square tube that can be manufactured, can be made similarly. There is an effect.
- the horizontal roll stand 20A and the vertical roll stand 20B are alternately arranged to suppress roll interference between adjacent stands, and the horizontal roll stand 20A. Since only the horizontal rolls 24A and 24A are rotated and the vertical rolls 24B and 24B of the vertical roll stand 20B are free rollers, member interference between adjacent stands is further suppressed. As a result, the overall length of the roll stand row 10 is suppressed to be short, and it is easy to secure a device arrangement space in the pipe manufacturing factory. Further, the weight of the apparatus is reduced, and the manufacturing cost can be reduced.
- the roll interval adjustment in the horizontal roll stand 20A and the roll interval adjustment in the vertical roll stand 20B can be carried out by combining a pair of horizontal roll interval adjustment motor 50A and vertical roll interval adjustment motor 50B. Repeat for each pair of stands 20. That is, the horizontal roll interval adjusting motor 50A and the vertical roll interval adjusting motor 50B are also used between the plurality of horizontal / vertical stand pairs 20. For this reason, the structure of the square tube forming apparatus is simplified. As a result, the apparatus weight is reduced, and the apparatus manufacturing cost is further reduced.
- the analysis software used for obtaining the analysis result is three-dimensional elasto-plastic deformation finite analysis software having sufficient accuracy to reproduce the actual molding developed by the present inventors.
- the drawing is schematically based on the result output from the software.
- FIG. 6 shows the change in the cross-sectional shape of the pipe from the round tube, which is a molding material, to the square tube of the product, step by step for each stand.
- FIG. 7 shows the cross-sectional shape of the tube from the round tube as the forming material to the square tube of the product.
- FIG. 8 shows the change in steps for each stand. Since the roll outer diameter is displayed at the same ratio in FIG. 5 and FIG. 7, it is easy to compare the outer diameters of the raw pipes.
- the flat roll stand row used in the square tube forming examples 1 and 2 is configured according to the square tube forming apparatus shown in FIGS. 1 to 4, and the vertical roll stand and the horizontal roll stand are paired with the vertical roll stand and the horizontal roll stand. It is a roll stand row of 12 rolls and 24 rolls arranged alternately. The roll diameter in each roll stand is 150 mm, and the total length of the roll stand row is 4660 mm.
- the 24 roll stands can individually set the amount of reduction, but the 12 roll stands with 1 pair of vertical and horizontal are divided into 3 groups with 4 groups as 1 group. Each group set its own reduction amount.
- the reduction amount distribution adopted for this plain steel blank was 9: 3: 1 in the order of the first group, the second group, and the third group.
- the first group performs molding with a reduction amount of 9/13 (about 69.3%), with the reduction amount necessary for the entire molding of the cross-sectional shape from the material round tube to the product square tube being 13, and the second group. Then, molding is performed with a reduction amount of 3/13 (about 23%), and the third group has a reduction amount distribution in which molding is performed with a reduction amount of 1/13 (about 7.7%).
- the same reduction amount is set for a pair of vertical rolls and horizontal rolls, and four square cuts of the square cross section are performed as a result of the flattening of the sides.
- the last stand RB8 of the first group finished molding about 69% of the total molding amount
- the last stand RB16 of the second group finished molding about 92%
- the last stand of the third group With RB24, the molding of 100% is finished both vertically and horizontally.
- a case of forming a flat rectangular product square tube having a width of 150 mm and a thickness of 7 mm is shown, and the reduction amount distribution is 9: 3 in the order of the first group, the second group, and the third group.
- the ratio is 1.
- the position of the corner can be set by selecting the amount of reduction so that the vertical side is large and the horizontal side is small for a pair of vertical roll and horizontal roll, As a result of the flattening of the sides, four squares with a rectangular cross section are formed.
- the last stand RB8 of the first group finished molding about 69% of the total molding amount
- the last stand RB16 of the second group finished molding about 92%
- the last stand of the third group With RB24, the molding of 100% is finished both vertically and horizontally.
- the reason why the amount of reduction is distributed in this manner is clearly shown in FIG. 8 in particular.
- the side portion is flattened at a stretch, and the square shape is formed.
- the group continues to perform square forming that promotes smooth flattening of the side, and the third group on the downstream side adopts a forming process for obtaining a predetermined dimension.
- such a reduction amount distribution is adopted in consideration of the planned product dimensions. It is a feature of the present invention that such a molding process according to product specifications can be adopted flexibly.
- the roll combined range in the analysis model is up to 3 times or less of the outer diameter ratio and 3 times or less of the aspect ratio, and it was confirmed from the analysis result that the actual machine was manufactured and actually operated.
- the grouping of the roll stands in the flat roll stand row is 3 groups with 1 pair ⁇ 4 groups (8 units) as 1 group, but 4 groups with 1 pair ⁇ 3 groups (6 units) as 1 group, 1 group 6 groups with 1 pair x 2 groups (4 groups) as 1 group, 12 groups with 1 pair x 1 group (2 groups) as 1 group, molding specifications (material of round tube, outer diameter and wall thickness, In addition, depending on the difference in the dimensions of the product square tube), a wide range of square tube forming can be performed by variously selecting the grouping method together with the rolling amount distribution.
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- Engineering & Computer Science (AREA)
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- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
Description
圧下方向が直交する第1フラットロールスタンドと第2フラットロールスタンドとが管材成形方向に沿って交互に配列されると共に、各ロールスタンドにおける圧下量を独立して設定できるフラットロールスタンド列を用い、
使用する被成形素管の外径、肉厚及び材質、並びに予定する製品角管の寸法に応じて予め選定される初段スタンドから終段スタンドまでの成形圧下量分布を、前記フラットロールスタンド列の各ロールスタンドにおける圧下量として個別に配分し、
且つ、隣接する第1のフラットロールスタンドと第2のフラットロールスタンドの少なくとも一方を駆動して、前記被成形素管を、予定する寸法の製品角管に成形するものである。
圧下方向が直交する第1フラットロールスタンドと第2フラットロールスタンドとが成形方向に沿って交互に配列されたフラットロールスタンド列を具備しており、
前記フラットロールスタンド列における各ロールスタンドは、圧下量を独立して設定できるロール間隔調整手段を有すると共に、隣接する第1フラットロールスタンドと第2フラットロールスタンドの少なくとも一方にロール駆動手段を有している。
なお、以下に述べる本発明の説明では、ロールスタンド列はフラットロールスタンド列のことであり、成形素材は被成形素管のことである。
20 水平垂直スタンド対
20A 水平ロールスタンド(第1のフラットロールスタンド)
21A 垂直ロッド
22A 固定水平ベース
23A 可動ベース
24A 水平ロール
25A ブラケット
26A ジャッキ
27A 入力軸
28A ギヤボックス
29A 動力伝達軸
20B 垂直ロールスタンド(第2のフラットロールスタンド)
21B 固定垂直ベース
22B 水平ロッド
23B 可動ベース
24B 垂直ロール
25B ロール支持枠
26B ジャッキ
27B 入力軸
28B ギヤボックス
29B 動力伝達軸
30 スタンドベース
40 ロール駆動機構(ロール駆動手段)
41 駆動ユニット
42 駆動モータ
50A 水平ロール用間隔調整モータ
50B 垂直ロール用間隔調整モータ
51 支持台
52 ステー
53 ケーブル
Claims (6)
- 素管成形方向に沿って配列された複数のロールスタンドに被成形素管である種々口径の丸管を通過させて製品である種々寸法の角管に成形する角管成形方法であって、
圧下方向が直交する第1フラットロールスタンドと第2フラットロールスタンドとが管材成形方向に沿って交互に配列されると共に、各ロールスタンドにおける圧下量を独立して設定できるフラットロールスタンド列を用い、
使用する被成形素管の外径、肉厚及び材質、並びに予定する製品角管の寸法に応じて予め選定される初段スタンドから終段スタンドまでの成形圧下量分布を、前記フラットロールスタンド列の各ロールスタンドにおける圧下量として個別に配分し、
且つ、隣接する第1のフラットロールスタンドと第2のフラットロールスタンドの少なくとも一方を駆動して、前記被成形素管を、予定する寸法の製品角管に成形する角管成形方法。 - 請求項1に記載の角管成形方法において、フラットロールスタンド列の一部分における1又は複数のロールスタンドにおいて、当該ロールスタンドを通過する管材のロール接触面Rより大きな曲率をもつ弧状凹部をフラットロールに形成して、前記管材に推進力を付加する角管成形方法。
- 請求項1に記載の角管成形方法において、隣接する1組の第1フラットロールスタンド及び第2フラットロールスタンドを対象とした1組の間隔調整用モータを、フラットロールスタンド列に沿って移動可能に配置して、フラットロールスタンド列における複数組の第1フラットロールスタンド及び第2フラットロールスタンド間で共用する角管成形方法。
- 請求項1~3の何れか一つに記載の角管成形方法を実施するための角管成形装置であって、
圧下方向が直交する第1フラットロールスタンドと第2フラットロールスタンドとが成形方向に沿って交互に配列されたフラットロールスタンド列を具備しており、
前記フラットロールスタンド列における各ロールスタンドは、圧下量を独立して設定できるロール間隔調整手段を有すると共に、隣接する第1フラットロールスタンドと第2フラットロールスタンドの少なくとも一方にロール駆動手段を有する角管成形装置。 - 請求項4に記載の角管成形装置において、
フラットロールスタンド列の一部分における1又は複数のロールスタンドにおいて、当該フラットロールスタンドを通過する管材のロール接触面Rより大きな曲率をもつ弧状凹部がフラットロールに形成された角管成形装置。 - 請求項4に記載の角管成形装置において、
隣接する1組の第1フラットロールスタンド及び第2フラットロールスタンドを対象とした1組の間隔調整用モータが、フラットロールスタンド列に沿って移動可能に配置されて、フラットロールスタンド列における複数組の第1フラットロールスタンド及び第2フラットロールスタンド間で共用される角管成形装置。
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US17/046,460 US20210170465A1 (en) | 2018-04-13 | 2019-04-12 | Square tube forming method and square tube forming device |
EP19785769.1A EP3778052A4 (en) | 2018-04-13 | 2019-04-12 | SQUARE TUBE MOLDING PROCESS AND DEVICE |
CN201980025553.3A CN112368089A (zh) | 2018-04-13 | 2019-04-12 | 方管成型方法及装置 |
KR1020207032284A KR20200139809A (ko) | 2018-04-13 | 2019-04-12 | 각관 성형 방법 및 장치 |
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