Classifications

• • 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
  • B21B—ROLLING OF METAL
  • B21B13/00—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories
  • B21B13/08—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process
  • B21B13/12—Metal-rolling stands, i.e. an assembly composed of a stand frame, rolls, and accessories with differently-directed roll axes, e.g. for the so-called "universal" rolling process axes being arranged in different planes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21B—ROLLING OF METAL
  • B21B17/00—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling
  • B21B17/14—Tube-rolling by rollers of which the axes are arranged essentially perpendicular to the axis of the work, e.g. "axial" tube-rolling without mandrel, e.g. stretch-reducing mills
• • 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
  • B21B—ROLLING OF METAL
  • B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
  • B21B31/16—Adjusting or positioning rolls
  • B21B31/20—Adjusting or positioning rolls by moving rolls perpendicularly to roll axis

Definitions

• the present invention relates to a method and device for forming a cylindrical pipe into an angular pipe, and more particularly it relates to a method for manufacturing an angular pipe, and device therefor, which can, in accordance with the dimensional variations of the angular pipe demanded, manufacture a large variety of angular pipes in small volumes efficiently.
• the rolls employed for the forming are configured from a plurality of vertical roll pairs and a plurality of horizontal roll pairs arranged alternately in the direction of travel of the cylindrical pipe.
• the configuration which is adopted involves the division of the forming rolls into several groups and the incorporation thereof on a common support frame for each divided group, and the employment of a support position control mechanism which, using the support frame unit, varies the position of the rolls on the pipe.
• the invention is characterized in that a support position control mechanism is employed to alter the roll position incorporated by the support frame and the roll gap in the vertical and horizontal direction, and the desired cylindrical pipe is sent forward to pass through the altered roll gap and is pushed or drawn wherein the desired deformation to the cylindrical pipe is applied to create the desired angular pipe.
• This invention by virtue of this configuration, enables angular pipes of differing dimensions to be formed, as appropriate, with high productivity, from cylindrical pipes of differing dimensions with no changing of the forming rolls at all.
• This process of forming the cylindrical pipe is one which involves the employment of a so-called 4-roll type forming roll configured from a driven, or non-driven, 4-piece roll group comprising an above/below pair of horizontal rolls 10a, 10b and a left/right pair of vertical rolls 20a, 20b arranged in such a way that the axial centres thereof lie along the same plane.
• the method adopted involves the employment of a plurality of stands of forming stands in which the abovementioned 4-piece group forming rolls are enclosed - normally 3 to 6 stands are employed - wherein the left/right and above/below centre of the roll gap of the abovementioned vertical roll pair and abovementioned horizontal roll pair enclosed by the abovementioned stands are aligned and arranged to be on a horizontal single line, and while the cylindrical pipe, which constitutes the raw material pipe, is sent to the downstream side passing through the gap formed by the arranged abovementioned 4-piece group rolls of the abovementioned forming stands, the desired deformation is applied to the cylindrical pipe an angular pipes successively formed.
• FIG. 2 shows one example of the application thereof.
• a cylindrical pipe 60 which constitutes the raw material pipe, is held at the end parts thereof in a ram 40 of an oil pressure cylinder 30 by way of a tightening means such as a chuck, and by the pressure force of the abovementioned oil pressure cylinder 30, the pipe is sent into (in the direction of the arrow in Figure 2), for the purpose of forming, the roll gap of the abovementioned forming roll where it is subjected to forming processing.
• the abovementioned forming stand row which is employed is configured from: enclosed rolls 50a and No. 1 forming roll stand for initiating the forming of the cylindrical pipe into a angular pipe; enclosed rolls 50b and No. 2 forming roll stand to advance the different form; and enclosed rolls 50c and No. 3 forming roll stand for finish- forming to an angular pipe 70 whose final cross-section is square or rectangular.
• the enclosed forming rolls in the case of, by way of example, the No. 1 moulder rolling stand are configured from 4-piece group rolls comprising an above horizontal roll 10c, below horizontal roll lOd, and a pair of left/right vertical rolls 20c, 20d.
• the configuration of the forming rolls in the No. 2 and No. 3 forming roll stands is the same.
• a forming device which comprises a mechanism for driving the above/below horizontal rolls or left/right vertical rolls is widely employed.
• the problem described in 1) above is a particularly serious problem pertaining to the manufacture of angular pipes.
• the need to manufacture a small volume of each of a diversified type of angular pipes of different dimensions has increased, and high productivity manufacturing technology which is able to deal with the production of many sizes in small lots has been demanded.
• the objective of the invention is to provide a method for manufacturing an angular pipe, and the device therefor, wherein: a variety of sizes of angular pipe are able to be formed from a cylindrical pipe without changing the rolls; shape defect such as warp is not generated at the side portion and the deformation strain is minimal; and manufacture can be achieved with high productivity.
• the cylindrical pipe can be moved forward and pushed or drawn through the predetermined roll gaps and an angular pipe, with a square cross-section or rectangular cross-section, can be continuously manufactured from a cylindrical pipe.
• each group is able to be supported by a supporting frame and position control of the roll in each group is able to be performed. Size changes can be executed easily and swiftly, and manufacture with good shape precision and good productivity can be achieved.
• the inventors discovered that, in a configuration in which it is possible to rotate all the vertical roll pairs and horizontal roll pairs along the axis of the cylindrical pipe, forming can be achieved in such a way that, the welding seam can be positioned at any portion of the cross-section of the angular pipe.
• Figure 1 is a schematic diagram that shows the schematic configuration of the forming rolls in a device for forming an angular pipe of the prior art.
• Figure 2 is a schematic diagram that shows the schematic configuration of a device for forming an angular pipe based on a method of push forming.
• Figure 3 is a schematic diagram which shows the schematic configuration of a pair of vertical rolls and pair of horizontal rolls for forming which are enclosed in a roll forming device employed in the method of manufacturing an angular pipe based on the present invention.
• Figure 4 is a schematic diagrams which shows a state in which 3 different types of angular pipe have been manufactured using the roll forming device based on the invention shown in Figure 3;
• Figure 4a shows a case in which a desired square-shaped angular pipe of comparatively large dimensions is manufactured from a cylindrical pipe;
• Figure 4b shows a case in which an oblong-shaped angular pipe is manufactured from a cylindrical pipe of the same diameter as that in Figure 4a;
• Figure 4c shows a case in which a square-shaped angular pipe of comparatively small dimensions is manufactured from a cylindrical pipe of small diameter.
• the roll forming device employed in the method for manufacturing the angular pipe based on the present invention, and more particularly, the con iguration of the enclosed forming roll groups, is shown in the Figure 3 type diagram.
• an above/below pair of horizontal rolls a, b and left/right pair of vertical rolls c, d are arranged alternately and at multiple stages 1 ⁇ n, m.
• the order of arrangement may be such that the vertical rolls are the first rolls.
• the axial centre of the vertical rolls and the axial centre of the horizontal rolls belonging to the adjacent vertical rolls pairs c, d and horizontal roll pairs a, b are, unlike the 4-roll type forming roll of the prior art shown in Figure 1, not on the same planar surface, and are arranged in such a way that a distance between the surface which includes the axial centre of the abovementioned horizontal roll pairs, and the surface which includes the axial centre of the abovementioned vertical roll pairs, is maintained to the degree that they do not interfere with each other.
• group division can be performed at the appropriate number of stages as determined from the demands of control or formability such as, by way of example, group division in a constant number such as at 3-stages 4-stages or 5-stages, or group division at a range of different numbers of stages.
• the abovementioned vertical roll groups and abovementioned horizontal roll groups are supported by joint supporting frames respectively.
• the supporting frame comprises a roll supporting mechanism equipped with a set-position altering control means which affords the adjustment and change, in accordance with the product dimensions and cylindrical pipe dimensions of the raw material pipe, of the roll gap formed by the abovementioned vertical roll pairs and the abovementioned horizontal roll pairs.
• the support frame itself may be moved by means of the set-position altering control means wherein, by way of example, a configuration may be adopted in which the gap between the aforementioned right vertical roll and aforementioned left vertical roll can be altered, as appropriate, by the employment of a set-position altering control mechanism, in which the abovementioned support frame is mounted in advance, to afford the movement in the left/right direction in respectively identical phases.
• a set-position altering control means for the roll pairs or support body any well known mechanical mechanism and control means can be adopted.
• the roll profile is established in such a way that, its curvature is reduced step-wise.
• a roll is employed which has a profile of a very small curvature, that is to say, a roll which is almost equivalent to a flat roll.
• the desired cylindrical pipe by way of the roll gap of the abovementioned vertical roll pairs and the abovementioned horizontal roll pairs arranged alternately in a row form, is moved forward and formed, by pushing or drawing while the desired deformation is applied, into the desired angular pipe which has either a square-shape or rectangular-shape cross-section.
• a roll drive device can be introduced to drive all or a selected portion of the rolls as appropriate, so that the automatic forwarding of the pipe during forming is possible, and the function of the device of the present invention can be improved even further.
• the number of vertical roll groups which form the abovementioned left/right pairs and the number of horizontal roll groups which form the abovementioned above/below pairs can be selected, as appropriate, based on factors such as the diameter of the cylindrical pipe being formed, the wall thickness, material quality, and shape and dimension of the angular pipe which is required.
• the diameter of the horizontal rolls and vertical rolls for the abovementioned forming is determined, as appropriate, by, for example, the dimensions and form of the angular pipe and the raw material pipe which constitutes the subject material.
• the dimensions and form of the angular pipe and the raw material pipe which constitutes the subject material are determined, as appropriate, by, for example, the dimensions and form of the angular pipe and the raw material pipe which constitutes the subject material.
• the diameter of the horizontal rolls and vertical rolls for the abovementioned forming is determined, as appropriate, by, for example, the dimensions and form of the angular pipe and the raw material pipe which constitutes the subject material.
• the entire length of the forming device in this case would be in the region of 2.5 m to 3.0 m, which is much shorter by comparison to the forming device of the prior art, and a marked shortening of the length of the device is possible.
• the method of forming based on the invention involves the forming using forming roll groups formed in a comparatively large number of pairs, it has a very small forming amount (forming strain) per roll compared to the 4-roll type forming method of the prior art. For that reason, the generation of cracks and other product defects can be prevented effectively.
• Figure 4b in the same forming device as the case of embodiment 1, shows a case in which a mounted roll setting-position altering control mechanism is employed and the gaps of the horizontal rolls and vertical rolls are altered, wherein an angular pipe, which has an oblong cross-section, is manufactured from a cylindrical pipe which has an outer diameter the same as that used in embodiment 1.
• Embodiment 3 shows a case in which a mounted roll setting-position altering control mechanism is employed and the gaps of the horizontal rolls and vertical rolls are altered, wherein an angular pipe, which has an oblong cross-section, is manufactured from a cylindrical pipe which has an outer diameter the same as that used in embodiment 1.
• Figure 4c shows a case in which, in a forming device the same as that of embodiment 1, a mounted roll setting-position altering control mechanism is employed and the gaps of the horizontal rolls and vertical rolls are altered, wherein an angular pipe is manufactured, which has a desired square cross-section of comparatively small dimension, from a cylindrical pipe.
• the forming device and roll forming method based on the invention in a method for forming an cylindrical pipe into a angular pipe, affords the realization of the complete common-use of forming rolls which had been impossible in the prior art, and it affords the efficient manufacture of angular pipes of different dimensions without changing of the roll groups.
• this invention is one in which, by a marked improvement in the productivity of the forming work and the gentle deformation applied to the raw material pipe, an angular pipe product of a high product quality standard, and with very high dimensional precision, can be manufactured easily and at low cost.
• the invention has, by comparison to the device and method for forming an angular pipe from a cylindrical pipe of the prior art, the following advantages:

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)
• Shaping Of Tube Ends By Bending Or Straightening (AREA)

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

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ID=15495720

Family Applications (1)

Country Status (5)

Cited By (3)

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Citations (5)

• 1999
  • 1999-04-21 JP JP11150379A patent/JP2000301233A/ja active Pending
• 2000
  • 2000-04-21 AT AT00917404T patent/ATE296691T1/de not_active IP Right Cessation
  • 2000-04-21 EP EP00917404A patent/EP1169150B1/de not_active Expired - Lifetime
  • 2000-04-21 WO PCT/JP2000/002612 patent/WO2000064606A1/en active IP Right Grant
  • 2000-04-21 DE DE60020545T patent/DE60020545T2/de not_active Expired - Fee Related

Patent Citations (5)

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