WO2003082495A1 - Procede de moulage a la presse a froid avec reduction du diametre - Google Patents

Procede de moulage a la presse a froid avec reduction du diametre Download PDF

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Publication number
WO2003082495A1
WO2003082495A1 PCT/JP2003/004269 JP0304269W WO03082495A1 WO 2003082495 A1 WO2003082495 A1 WO 2003082495A1 JP 0304269 W JP0304269 W JP 0304269W WO 03082495 A1 WO03082495 A1 WO 03082495A1
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WO
WIPO (PCT)
Prior art keywords
diameter
tube
forming
press
preforming
Prior art date
Application number
PCT/JP2003/004269
Other languages
English (en)
Japanese (ja)
Inventor
Tsuyoshi Ishikawa
Original Assignee
Nakayama Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nakayama Corporation filed Critical Nakayama Corporation
Priority to AU2003236357A priority Critical patent/AU2003236357A1/en
Publication of WO2003082495A1 publication Critical patent/WO2003082495A1/fr

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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
    • B21C3/00—Profiling tools for metal drawing; Combinations of dies and mandrels
    • B21C3/02—Dies; Selection of material therefor; Cleaning thereof
    • B21C3/08—Dies; Selection of material therefor; Cleaning thereof with section defined by rollers, balls, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces

Definitions

  • the present invention relates to a cold-diameter breathing method for forming a metal tube and a metal tube formed thereby.
  • the present invention relates to a method for cold reducing a diameter of a metal tube, and a metal tube formed by reducing the diameter.
  • the present invention relates to a method for reducing the diameter of a metal tube by press molding and a tube formed by the method.
  • a steel pipe is cold-drawn by a three-roll reducer (Japanese Patent Laid-Open No. 7-51707). This is intended to suppress uneven thickness of the weld.
  • the aim is to achieve this object by using a drawing process using three or more reducers and a two-roll type constant diameter machine with two or more stands.
  • the applicant of the present application has proposed a method of cold-diameter forming of a metal tube by cold-hole forming, in which an original tube made of a metal pipe is traversed in an elliptical shape, an elliptical shape, or a square shape by a preforming roll.
  • a diameter reduction forming step is performed in which the outer peripheral length is reduced from the outer peripheral length of the original tube while reshaping into a circular shape or another cross sectional shape different from the cross sectional shape of the preformed metal tube.
  • a cold reduction roll forming method for metal pipes characterized by the above features and a metal pipe formed by this method have been proposed (PC TZJ P01 / 08310). Disclosure of the invention
  • the present invention is based on the cold roll forming method of a metal pipe by cold roll forming proposed in the earlier patent application by the applicant of the present invention, and a metal pipe reduced in diameter from an original pipe made of a metal pipe.
  • a metal tube reduced in diameter from the original tube and having irregularities formed on the inner and / or outer periphery, or an inner / outer double tube reduced in diameter from the original tube is easily and reliably formed. It is an object of the present invention to provide a cold diameter reduction forming method which can be carried out with smaller equipment and machines by using a cold reduction diameter forming method, and a metal pipe formed thereby.
  • a cold-diameter forming method of a metal tube proposed by the present application is to press-mold a raw tube made of a metal pipe having a non-circular cross-sectional shape by using a forming die.
  • a metal pipe having a cross-sectional shape different from the cross-sectional shape of the original pipe, and a diameter reducing step of reducing the outer peripheral length from the outer peripheral length of the raw pipe is performed. This is a diameter reduction press molding method.
  • the diameter reduction forming step of reducing the outer peripheral length from the outer peripheral length of the original tube while forming the original tubes to have different cross-sectional shapes can be repeated a plurality of times until a desired diameter is obtained.
  • the forming die used in the diameter reducing forming step repeated a plurality of times is configured such that the cross-sectional shape of the metal tube formed by the immediately preceding press forming is changed to a different cross-sectional shape by the next press forming.
  • the arrangement is adjusted and used.
  • This adjustment is performed, for example, by changing the arrangement position of the molding die used for the next press molding with respect to the arrangement position of the molding die used for the immediately preceding press molding, by using a metal pipe to be reduced in diameter.
  • the position of the molding die used for the immediately preceding press molding and the arrangement of the molding die used for the next press molding, such as by rotating the shaft at a predetermined angle with respect to the center axis of the The position is displaced relatively each time.
  • the molding dies used for press molding in the above-described diameter reducing molding step may each be composed of a plurality of dies. By doing so, it is possible to prevent the pipe from sticking out due to the reduction in diameter and the occurrence of scratches and the like.
  • the number of dies and the shape of the dies used in the press forming in the diameter reduction forming process, each of which includes a plurality of dies, are variously determined, and the forming by the immediately preceding press forming is also possible.
  • the cross-sectional shape of the metal tube to be formed can be formed into a different cross-sectional shape by the next press forming.
  • another cold reduction forming method of a metal pipe proposed by the present application is to perform a roll forming using a preforming roll or a preforming die for a raw pipe made of a metal pipe having a circular cross-sectional shape.
  • a preforming step of preforming a tube having another cross-sectional shape different from the cross-sectional shape of the original tube by the first press forming used, followed by a second press forming using a forming die In this way, the preformed metal tube is reformed into another cross sectional shape different from the cross sectional shape of the preformed metal tube, and the outer peripheral length is reduced from the outer peripheral length of the original tube.
  • a cold reduction press forming method for a metal tube is to perform a roll forming using a preforming roll or a preforming die for a raw pipe made of a metal pipe having a circular cross-sectional shape.
  • the cross-sectional shape of the raw tube is polygonal, and the longitudinal tube extending from one end to the other end of the raw tube.
  • the second press molding using a molding die
  • the preforming step roll forming or first press forming using a preforming die
  • the second press forming step can be alternately repeated until a desired diameter is obtained.
  • the second press forming step for diameter reduction forming is performed once or plural times. Can be repeated.
  • the preforming step is performed once or more than once, and then the second press forming step for diameter reduction is performed once. Or, even if it is performed multiple times, in the forming process after the second breath forming process is first performed, the cross-sectional shape of the metal tube obtained by the immediately preceding forming differs depending on the next forming. It is desirable to be formed into a.
  • the first preforming step (roll forming or first press forming using a preforming die), the first second breath forming step, and the second preforming step (roll forming or preforming).
  • First press forming using mold Second second press forming step 1
  • Third preforming step (Roll forming or first press forming using preforming mold) 13th second press forming step
  • the pre-forming step (roll forming or first press forming using a pre-forming die) Is performed once or more than once, and then even if the second press forming step for diameter reduction is performed once or more than once, the forming after the second press forming step is performed first
  • the preforming roll or press used in the immediately preceding molding is used.
  • the next pre-molding port with respect to the position of the molding die The pre-forming or press-forming process can be performed by rotating the position of the metal mold for press forming or press forming by a predetermined angle with respect to the center axis of the metal pipe to be reduced in diameter. It is performed by displacing the used preforming rolls or press forming dies and the next preforming rolls or press forming dies each time. be able to.
  • the preforming step is performed once or more than once, and then the second press forming step for diameter reduction forming is performed.
  • the preforming rolls or preforming dies used in the preforming process and the press forming dies used in the diameter reduction forming process are each of multiple It may be composed of a preforming roll or a plurality of preforming dies and a plurality of forming dies. By doing so, it is possible to prevent the pipe from sticking out due to the reduction in diameter, and the occurrence of scratches and the like.
  • the cross-sectional shape of the metal tube obtained by the immediately preceding molding differs depending on the next molding. It can be made to be molded.
  • two preforming rolls 2a and 2b can be used as shown in Fig. 1 (a).
  • Fig. 1 (a) two preforming rolls 2a and 2b can be used as shown in Fig. 1 (a).
  • FIGS. 1 (a) and (b) four preforming rolls 2a, 2b, 2c and 2d can be used.
  • a preformed metal pipe having the cross-sectional shape shown in FIGS. 1 (a) and (b) can be obtained by press forming instead of a preforming die for press forming.
  • the plurality of preforming rolls used in the preforming step rotate partly or entirely in conjunction with each other, so that the metal pipe to be preformed moves with respect to the preforming rolls. Can be used.
  • the plurality of preforming rolls used in the preforming step are idle rollers, some or all of which are not receiving the driving force from the driving means, and the metal pipe to be subjected to the preforming is pushed in.
  • the metal pipe to be subjected to the preforming is pushed in.
  • roll forming there are roll-driven roll forming method, roll-less driven draw forming method, and next-roll forming method, and all methods can realize preforming.
  • pipes formed by a cold drawing method may be used instead of preforming into a square shape.
  • a preformed metal tube having an elliptical or elliptical cross section 1a by a single preforming by roll forming or press forming as shown in Fig. 1 (a)
  • a single preforming roll or a preforming die for press forming is used.
  • preformed metal pipe with a triangular polygonal cross section In order to obtain a preformed metal pipe with a triangular polygonal cross section by one preforming by roll forming or press forming, two or three preformed rolls or presses are required. A preforming mold for molding is used.
  • the cold reduction press forming method for a metal pipe when the raw pipe made of a metal pipe has a circular cross-sectional shape, a roll using a preformed roll is used.
  • the first press forming using a forming or preforming mold first requires a preforming step of preforming so as to have another cross sectional shape different from the cross sectional shape of the original tube.
  • the pre-forming step is not performed, and the cross-sectional shape is different from the cross-sectional shape of the original tube by press forming using a forming die.
  • the circular cross-sectional shape includes the case where the cross-sectional shape of a metal pipe subjected to diameter reduction processing, that is, the original pipe, is not only a perfect circle but also a substantially circular shape close to a perfect circle. is there.
  • the non-circular cross-sectional shape refers to a metal pipe that undergoes diameter reduction processing, that is, the cross-sectional shape of the original pipe is square or polygonal, such as rectangular, square, pentagonal, hexagonal, or polygonal. Or, it refers to a shape that is not included in the concept of the above-mentioned circular cross-sectional shape, such as an elliptical shape and an elliptical shape.
  • the diameter can be easily reduced using a small press machine as compared with a roll forming machine.
  • This press machine can use the press machine conventionally used for press forming, and can perform diameter reduction forming without requiring any specific mechanical equipment for swaging, heating, etc. .
  • each of the forming dies used for press forming in the diameter reducing step has an uneven portion on its surface, and the outer periphery of a predetermined position of the metal tube subjected to the diameter reducing by the forming die. On the surface, it is possible to form projections and depressions corresponding to the irregularities on the surface of the molding die.
  • the diameter reduction forming step including the outer peripheral surface of the preformed metal tube and the concave and convex portions such as a desired pattern dug into the surface in advance. Due to the contact with the surface of the molding die for press molding, it is possible to provide a convex or concave portion such as a desired pattern on the outer peripheral surface of the metal tube subjected to the diameter reduction simultaneously with the diameter reduction.
  • the metal pipe (round pipe 1b) shown in FIG. 3 (a) shows a part of a metal pipe formed by the method of the present invention, but has a concave and convex portion on the surface.
  • a desired pattern is dug into the surface of a molding die used for press molding in the diameter reduction forming step, so that the metal tube after the diameter reduction molding is formed.
  • the desired shape / pattern can be provided at a desired position, for example, over the entire length in the circumferential direction or at a part in the long direction.
  • the press forming step for the diameter reduction forming or the second press forming step can be performed in a state where the mold is inserted into the original tube.
  • This mold material is used by inserting it into the inside of the original pipe, that is, inside the metal pipe to be the original pipe when performing the diameter reducing step after the preforming step.
  • This mold material serves to support and fix the original tube during the press forming in the diameter reducing process, and also plays a role in preventing the original tube from being displaced during the diameter reducing forming. .
  • the shape member by inserting the shape member into the original pipe, it is possible to prevent buckling from occurring inside the metal pipe even when the thickness of the original pipe is thin.
  • a mold material is inserted into the raw pipe during the diameter-reduction forming step by press forming using a forming die. This effectively prevents buckling inside the metal pipe.
  • the inner peripheral length can be reduced without changing the press forming die in the diameter reducing process. It is possible to form a metal tube having a reduced diameter and a metal tube having a reduced diameter.
  • a concave and convex portion is formed on the inner peripheral surface at a predetermined position of the metal tube at the same time as the diameter reduction molding. I can do it.
  • straight ridges and valleys extending in the longitudinal direction that is, extending parallel to the central axis of the metal tube can be formed.
  • the desired shape and pattern of irregularities are formed on the inner peripheral wall at the desired position of the metal pipe. You can also.
  • the desired shape and pattern irregularities on a part of the outer periphery of the mold material, the desired shape and pattern of the desired shape and pattern can be formed only on the desired portion of the inner peripheral wall of the metal tube having a reduced diameter. It can also be formed.
  • each of the inner peripheral wall and the outer peripheral wall of the metal tube to be reduced in diameter is used. It is possible to form the desired shape and pattern at the desired position at the same time.
  • the shape of the pattern formed on the inner periphery is adjusted by appropriately adjusting the arrangement position of the mold material inserted inside the original pipe and the position of the concave and convex portions provided on the outer peripheral surface of the mold material. And the shape and pattern formed on the outer periphery can be given a specific relationship.
  • the mold is a split mold, and a tapered pin that can slide in the axial direction of the split mold is disposed at the center of the split mold, and the tapered bin is a split mold. By sliding in the axial direction, the size of the outer diameter of the split mold can be adjusted.
  • the mold 50 is divided into four split molds 5 1 a
  • the tapered pin is slid in the axial direction of the split die to loosen the split die.
  • the split mold can be extracted from the reduced-diameter molded pipe.
  • the outer diameter of the die split die
  • the cross-sectional shape of the metal tube whose diameter has been reduced can be any shape such as a circle, an ellipse, an oval, a square, and a polygon. It is possible.
  • the various cross-sectional shapes described above can be obtained by variously determining the number of dies used for the dies of each diameter reducing press and the shape of the dies.
  • any of the cold reduction press forming methods for a metal tube according to the present invention the metal tube which has been subjected to the diameter reduction over the entire length of the preformed metal tube is formed. You can also get.
  • a metal tube having only a part with a different outer peripheral length in which only a part is reduced in diameter and the remaining part is simply formed.
  • a metal pipe having a stepped portion having a partly rectangular tube and a partly round tube having different peripheral lengths it is possible to obtain a metal pipe having a stepped portion having a partly rectangular tube and a partly round tube having different peripheral lengths.
  • the two tubes can also be joined by reducing the diameter by the cold-diameter press forming method of the present invention and crimping.
  • a reduction ratio of 3% or more can be achieved in the reduction forming step using a forming die.
  • a diameter reduction ratio of 3% or more can be achieved by a preforming step and a subsequent diameter reduction step using a molding die.
  • a raw tube having a non-circular cross-sectional shape is formed by breath molding using a molding die.
  • the cross-sectional shape of the metal tube formed by the immediately preceding press forming is By forming into a different cross-sectional shape by the next breath forming, when the preforming step and the second press forming step are alternately repeated, or the preforming step is performed once or multiple times
  • the metal pipe formed by the immediately preceding forming step is formed.
  • the small-diameter inner pipe comprises a large-diameter metal pipe having a non-circular cross-sectional shape.
  • the inner and outer double original tubes inserted into the outer tube are formed by press molding using a molding die so that the outer tube has another cross-sectional shape different from that of the outer tube.
  • a diameter reduction forming step of reducing the outer peripheral length of the outer tube from the initial outer peripheral length of the outer tube a structure in which part or all of the inner peripheral surface of the outer tube is in close contact with the outer peripheral surface of the inner tube is provided. It is characterized by forming a double tube having the same.
  • At least the outer peripheral length of the outer tube is formed by press molding using a molding die so that the outer tube has another cross-sectional shape different from that of the outer tube.
  • the diameter of the outer tube is reduced from the initial outer length by a plurality of times until a part or the whole of the inner surface of the outer tube comes into close contact with the outer surface of the inner tube to form a double tube having a desired diameter. Can be repeated.
  • the molding die used in the diameter reduction molding process repeated a plurality of times is such that the cross-sectional shape of the outer tube formed by the immediately preceding press forming has a different cross-sectional shape due to the next press forming. It is desirable that the layout be adjusted and used. The method of this adjustment can be the same as in the case of the single tube described above.
  • each of the molding dies used in the diameter reducing molding step can be made up of a plurality of dies.
  • the number and shape of the molds are determined in various ways, so that the outer tube formed by the immediately preceding press molding
  • the cross-sectional shape can be made to have a different cross-section ⁇ K by the next breath forming as in the case of the single tube described above.
  • the number of times press forming for diameter reduction is performed depends on the material and thickness of the metal tube to be diameter reduced, for example, the material, wall thickness, ratio of diameter reduction, and diameter reduction of the outer tube and the inner tube. It can be determined according to the use of the formed metal tube.
  • still another cold reduction press forming method for metal pipes proposed by the present application is that a small-diameter inner pipe is inserted into an outer pipe composed of a large-diameter metal pipe having a circular cross-sectional shape.
  • a heavy original pipe is pre-formed by roll forming using a pre-forming roll or first press forming using a pre-forming die so that the outer pipe has a different cross-sectional shape.
  • a preforming step, followed by a second press forming using a forming die, causes the preformed outer pipe to be crossed to another cross section having a different cross-sectional shape from that of the preformed outer pipe.
  • a step of reducing the diameter of at least the outer peripheral length of the outer tube from the initial outer peripheral length of the outer tube while reshaping the outer tube into a planar shape When forming an outer tube, press forming using a molding die The diameter-reducing forming at least reducing the outer circumferential length of the outer tube from the initial outer circumferential length of the outer tube while forming the cross-sectional shape to have another different cross-sectional shape is performed by a preforming step (roll forming or preforming). The first press molding using a molding die) and the second press molding step can be alternately repeated.
  • the second press forming step is performed once or multiple times It can be repeated.
  • the number of times the pre-forming step and the second press-forming step are alternately repeated.
  • the number of times of the second press forming process depends on the material of the metal tube to be reduced in diameter.
  • the thickness can be determined according to, for example, the material of each of the outer tube and the inner tube, the wall thickness, the ratio of reducing the diameter, the use of the metal tube having the reduced diameter, and the like.
  • the second press forming step is repeated. Even if it is repeated or repeated a number of times, in the forming step after the second press forming step is first performed, the cross-sectional shape of the outer tube formed by the immediately preceding forming depends on the next forming Desirably, it is formed into a different cross-sectional shape as in the case of the single tube described above.
  • the preforming rolls or preforming dies used in the preforming process and the press forming dies used in the diameter reduction forming process are respectively a plurality of preforming holes or a plurality of preforming rollers.
  • the second press forming process can be performed first by setting the number and shape of the dies in a variety of ways, including the pre-forming dies and a plurality of forming dies.
  • the outer pipe formed by the immediately preceding molding in the subsequent molding step can be formed into a different cross sectional shape by the next molding. Is the same as
  • the plurality of preforming rolls used in the preforming step are such that the original tube which receives the preforming by partially or entirely rotating in conjunction with the preforming roll is connected to the preforming roller.
  • the same method as that of the single pipe described above can be used for the moving method.
  • the plurality of pre-forming rolls used in the pre-forming step are idle rollers, some or all of which are not receiving the driving force from the driving means, and the original tube receiving the pre-forming is By being pushed into the hole of the preforming roll from the upstream side by pushing means, or by being pulled out from the hole of the preforming roll to the downstream side by the bow I punching means.
  • the preform is received by being pushed into the hole of the preforming roll from the upstream side by pushing means and pulled out from the hole of the preforming roll to the downstream side by drawing means.
  • the method in which the original tube is moved with respect to the preforming roll can be adopted in the same manner as in the case of the single tube described above.
  • the metal pipe or raw In the case of moving the pipe, the following method can be adopted.
  • the preforming roll is composed of a plurality of rolls, and a metal tube or a raw tube which receives the preforming by rotating part or all of the plurality of rolls in each preforming roll in conjunction with each other.
  • the method moves with respect to the preforming roll.
  • FIG. 2 (c) This is called a roll forming method (roll driving method), an example of which is shown in FIG. 2 (c).
  • FIG. 2 (c) In the illustrated embodiment, reference numerals 41a, 41b, and 41c denote preforming rolls, respectively, in which the preforming rolls are continuously formed. It is repeated several times. If a roll having a plurality of preforming stands is arranged in tandem in this way, it is also possible to adopt a method in which only some of the stands are forcibly driven. For example, if a set of four rolls is used, only the set of two rolls can be forcibly driven.
  • FIG. 2 (c) In the example shown, only two rolls of the preforming roll 4la and only the rolls 2a and 2c of the preforming roll 41c are forcibly driven.
  • the preforming rolls are each composed of a plurality of rolls, and some or all of the plurality of rolls in each preforming roll are idler rolls that have not received the driving force from the driving means. , One of the following methods could be used.
  • the first method is that a raw tube to be preformed is pushed from the upstream side into a hole shape of a preforming roll and a hole shape of a reduced-diameter forming roll by a pushing means, whereby a preforming roll of the original tube is formed. Is moved.
  • This is called the next roll forming method (roll non-drive pipe pushing method), an example of which is shown in FIG. 2 (a).
  • the pushing means a hydraulic cylinder or a hydraulic jack can be used. In the embodiment shown in FIG. 2 (a), the rod 5 of the hydraulic cylinder 4 is pushed out, whereby the round steel pipe 1 as the original pipe moves and is preformed by the preforming roll.
  • the round steel pipe 1 which is the raw pipe to be preformed, is drawn out to the downstream side from the hole shape of the preforming roll 31 and the hole shape of the reduced diameter forming roll by a drawing means.
  • the original tube is moved with respect to the preforming roll.
  • This is called the draw forming method (roll-driven pipe pulling method), an example of which is shown in Fig. 2 (b).
  • a chuck for gripping the distal end side of the metal tube, a hydraulic jack for holding and pulling the chuck, or a chain for pulling the chuck while being driven in rotation can be used.
  • the third method is a combination of the first method and the second method, wherein the original tube to be preformed is pushed into the hole shape of the preforming roll from the upstream side by a pushing means, and is pulled out. By pulling out from the hole shape of the preforming roll to the downstream side by means, the original pipe is moved with respect to the preforming roll.
  • a preferable method can be selected from the above-mentioned methods according to the relationship of the diameter, wall thickness, length, molding speed, etc.
  • FIGS. 2 (a) and 2 (b) describes a case where only one set of preforming steps is required.
  • FIG. 2 (c) a plurality of tandemly arranged It is also possible to adopt a form in which preforming is performed a plurality of times by using the preforming hole.
  • the method of preforming a metal tube by a roll forming method in the preforming step has been described.However, the same effect can be obtained by a method using a press and a cold drawing method. It is possible to reduce the diameter of the preformed pipe formed by the above method.
  • the inner tube may be inserted over the entire length of the outer tube or only a part of the outer tube. Further, it is also possible to adopt a form in which the outer pipe is mounted on a part of the inner pipe.
  • the inner / outer double is formed over the entire length by the cold reduction press forming method applied to the formation of the double tube of the present invention described above.
  • a double tube can be formed.
  • the inner pipe is inserted only in a part of the outer pipe, a double pipe in which only the portion where the inner pipe is inserted is formed thicker can be formed.
  • the outer tube is provided around a part of the inner tube, it is possible to form a double tube in which only the portion where the outer tube is provided is thick.
  • the forming dies used for the diameter reduction are each respectively. Since the surface of the metal tube is provided with projections and depressions, the diameter of the metal tube can be reduced while forming the depressions and projections on the surface of the metal tube whose diameter has been reduced by the molding die.
  • the press forming step or the second press forming step for diameter reduction forming can be performed in a state where the mold material is inserted into the inner tube.
  • a predetermined irregularity is formed on the outer peripheral surface of the mold material, and the irregularity can be formed on the inner peripheral surface at a predetermined position of the inner tube simultaneously with the diameter reduction molding.
  • tapered bins that are slidable in the axial direction of the split mold are arranged at the center of the split mold, and the tapered bins slide in the axial direction of the split mold. By moving the arm, the size of the outer diameter of the split mold can be adjusted.
  • an internal / external double tube can be easily manufactured.
  • the inner circumference of the outer pipe is reduced in diameter so that the inner circumference of the outer pipe is smaller than the outer circumference of the inner pipe, whereby the inner circumference of the outer pipe and the outer circumference of the inner pipe are formed.
  • a double tube with a close-fitting structure can also be formed.
  • the outer pipe of the inner pipe and the inner pipe of the outer pipe are in direct contact with uniform pressure, and the heat characteristics become uniform. Therefore, in any of the above-described methods for forming a double pipe, which can provide a double pipe product with significantly improved reliability, the same as described above, the circular shape Is a concept that includes not only a perfect circular shape but also a substantially circular shape close to a perfect circle.
  • the non-circular shape means that the cross section of the outer tube has a rectangular shape such as a triangular shape, a square shape, a pentagonal shape, a hexagonal shape or a polygonal shape, or an elliptical shape, an oval shape, A shape that is not included in the concept of a circular shape.
  • the inner tube may be made of the same material as the metal tube constituting the outer tube or a metal tube of a different material. Further, a non-metallic tube made of a different material from the metal tube constituting the outer tube may be used.
  • the inner tube may be a tube made of aluminum, titanium, or a synthetic resin.
  • the double pipe 10 shown in FIG. 3 (b) is manufactured by the method of the present invention, and the synthetic resin pipe 8 is disposed inside the round steel pipe 7. Since the round steel pipe 7 is reduced in diameter by the diameter reducing step by press forming, the inner peripheral wall of the round steel pipe 7 and the outer peripheral wall of the synthetic resin pipe 8 abut uniformly and at equal pressure to form an integral double pipe. Tubes are being manufactured.
  • the inner tube is made of the same material as the metal tube forming the outer tube, a metal tube of the same material as the outer tube, or a non-metal tube of a different material from the metal tube forming the outer tube.
  • the formed pipes are used as inner pipes, which are inserted into large diameter metal pipes.
  • the inner and outer triple tubes can be formed.
  • it is possible to form multiple tubes such as a quadruple tube and a quintuple tube.
  • any of the cold reduction press forming methods of the present invention applied to the formation of a double pipe when the outer pipe is reduced in diameter by using the reduced diameter press forming, the gap between the reduced diameter press forming dies is reduced. It is possible to reduce the diameter of the outer tube without extruding the outer tube into the tube.
  • the double pipe can be formed using the reduced-diameter forming die. It is only necessary to clean the inner and outer tubes by washing. That is, it is not necessary to perform pretreatment such as heat treatment and mechanical treatment on the inner pipe and the outer pipe.
  • a double tube can be formed using a reduced-diameter forming die, a special material is not required as a press die material, and surface treatment of the die is not required, so that it is inexpensive and efficient.
  • a heavy tube can be formed.
  • the preforming step and the subsequent reduction press forming once are performed.
  • a diameter reduction ratio of 3% or more was achieved.
  • a diameter reduction rate of 3% or more could be achieved in one round of diameter reduction breath forming.
  • the diameter reduction rate can be varied between 3% and 22% depending on the preforming step to be used and the form of the diameter reduction press mold.
  • a pre-forming die equipped with three pre-forming dies is preformed into a triangular cross-section, and then Then, with a press molding machine equipped with three molding dies, a mold material is inserted into the preformed metal tube, and the apex of the triangle of the preformed metal tube is directed inward. By reducing the diameter in the compression direction, a reduction rate of 22% was achieved.
  • a preforming stand equipped with four preforming rolls is preformed into a pentagonal cross section, and subsequently, With a press forming machine equipped with five forming dies, a mold is inserted into the preformed metal tube, and the pentagonal apex of the preformed metal tube is pressed inward. A diameter reduction ratio of 7.2% was achieved by reducing the diameter in the direction of reduction.
  • the outer pipe is reduced in diameter by a combination of a single preforming step and a single press forming step using a forming die for press forming. Rates of 3% to 22% were possible.
  • the cold reduction press forming method for metal tubes proposed by the present invention has been described above.
  • the metal pipe proposed by the present invention is formed by any of the above-described cold reduction press forming methods of the metal pipe of the present invention.
  • FIG. 1 (a) is a schematic sectional view illustrating a preforming step of the present invention
  • FIG. 1 (b) is another schematic sectional view explaining a preforming step of the present invention.
  • FIG. 2 (a) is a perspective view illustrating an embodiment of an extrusion forming method employed in the preforming step of the present invention
  • FIG. 2 (b) is employed in the preforming step of the present invention
  • FIG. 2 (c) is a perspective view illustrating an embodiment of a roll forming method employed in the preforming step of the present invention.
  • FIG. 3 (a) is a perspective view showing a metal tube of the present invention, which is a reduced-diameter tube formed by the method of the present invention and has a groove formed in a direction parallel to the axis on the outer periphery
  • (B) is a perspective view in which a part of the double pipe formed by the method of the present invention is cut and represented.
  • FIG. 4 (a) is a side view of a mold used when press molding is performed in the method of the present invention
  • FIG. 4 (b) is a cross-sectional view of the mold shown in FIG. 4 (a).
  • FIG. 5 is a schematic cross-sectional view illustrating a step of reducing the diameter of a square steel pipe into a round steel pipe by press molding.
  • FIG. 6 is a schematic cross-sectional view illustrating a step of performing diameter reduction forming from a pipe having a circular cross-sectional shape.
  • FIG. 6 (a) is a schematic cross-sectional view illustrating a preforming step by roll forming.
  • FIG. 7 (b) is a schematic cross-sectional view for explaining a diameter reduction forming step by press molding.
  • FIG. 7 is a schematic cross-sectional view for explaining a step of performing diameter reduction forming from a tube having a rectangular cross section.
  • Figure (a) is a schematic cross-sectional view illustrating the process of reducing the diameter of a rectangular tube into an octagonal cross-section by a press die.
  • FIG. 7 (b) is a diagram of reducing the diameter to an octagonal cross-section.
  • FIG. 3 is a schematic cross-sectional view illustrating a step of reducing the diameter of a press-formed pipe into a round steel pipe by press forming.
  • FIG. 8 is a schematic sectional view illustrating a step of forming a double pipe according to the present invention.
  • Fig. 8 (a) is a schematic cross-sectional view for explaining a step of preforming the outer tube into a rectangular cross-sectional shape by roll forming, and Fig. 8 (b) is reducing the diameter of the outer tube by press forming; It is an outline sectional view explaining a process of forming a double pipe (round steel pipe).
  • a 4 Omm x 4 Omm square steel pipe 60 (thickness: 1.6 mm, outer circumference: 134 mm, length: 150 mm) is formed into a round steel pipe 63 by press forming.
  • press-mold in the directions of arrows 62a, 62b, 62c, and 62d press-mold in the directions of arrows 62a, 62b, 62c, and 62d to form round steel pipe 63 with an outer diameter of 4 Omm. The diameter was reduced.
  • the bin 53 of the mold 50 was slid in the direction of the arrow 55 to loosen the mold 50 and pulled out from the round steel pipe 63.
  • the outer circumference of the round steel pipe 63 was 125.7 mm, and was reduced in diameter by about 6.2%.
  • the above-mentioned four-piece mold material was extracted, and instead, eight-piece mold materials were inserted, press-formed using eight molding dies, and reduced in diameter to a round steel pipe with an outer diameter of 4 Omm.
  • the outer diameter of the reduced-diameter round steel pipe was 125.6 mm, which was reduced by approximately 6.2% from the square steel pipe with a non-circular cross-sectional shape as the original pipe.
  • JIS standard STK400-E—G (outer diameter: 42.7mmx thickness: 1.6mm, length: 150mm) is used as a raw tube, and four preforming rolls 71a, 71b, Preforming was performed using 71c and 71d.
  • Fig. 1 (b) was passed through the state shown in the figure, and preformed into a square tube 73 (Fig. 6 (b)) with a cross section of 39.5mm x 39.5mm.
  • JIS standard STK400—E-G (outer diameter: 42.7mmx thickness: 1.6mm, length: 150mm) is used as the original tube, and four of them are shown in Fig. 4 (a) and (b). Inserting the split mold material and preforming by press molding using four molding dies, the cross section indicated by reference numeral 73 in FIG. 6 (b) is 39.5 mm x 39.5 mm Was preformed into a square tube. Next, insert the four-piece mold material as shown in Figs. 4 (a) and (b) into the preformed tube, press-mold using four molding dies, and make an outer diameter of 40mm. Of a round steel pipe. The diameter reduction rate from the original tube was 6.3%.
  • JIS standard STK400-E-G (outer diameter: 42.7 mm x thickness: 1.6 mm, length: 150 mm) was used as a raw tube, and preforming was performed using four preforming rolls. The four pre-formed rolls are set at desired positions in the directions indicated by arrows 72a, 72b, 72c and 72d in FIG. 6 (a), and the original tube is set as shown in FIG. 1 (b). It was preformed into a square tube 80 (Fig. 7 (a)) with a cross section of 39.5mm x 39.5mm.
  • FIGS. 4 (a) and (b) a four-piece mold as shown in FIGS. 4 (a) and (b) is inserted into this tube 80, and four molds 81a, 81b, 81c and 81d are used. , Arrow 82a,
  • JIS standard STK400-E—G (outer diameter: 42.7 mm x thickness: 1.6 mm, length: 150 mm) is used as the original tube, and four pre-formed rolls are used as shown in Fig. 1 (b).
  • the original tube was preformed into a square tube having a cross section of 39.5 mm x 39.5 mm as shown by reference numeral 73 in Fig. 6 (b).
  • a second preforming was performed with four rolls to form a square tube having a cross section of 39. Ommx 39. Omm as shown by reference numeral 73 in FIG. 6 (b).
  • JIS standard STK400-E—G (outer diameter: 42.7 mm x thickness: 1.6 mm, length: 15 Omm) is used as the original tube, and four pre-formed as shown in Fig. 1 (b) By mouth, this original tube was preformed into a square tube with a cross section of 39.5 mm x 39.5 mm as shown by reference numeral 73 in Fig. 6 (b).
  • a second preforming was performed with four rolls to form a square tube having a cross section of 39. Ommx 39. Omm as shown by reference numeral 73 in FIG. 6 (b).
  • press molding was performed using four molding dies to form a round steel tube with an outer diameter of 39 mm.
  • the diameter reduction ratio was about 8.7%.
  • this round steel pipe is formed by four preforming rolls with a cross section of 37. Ommx 37. Omm as indicated by reference numeral 73 in Fig. 6 (b). Preformed into square tubes.
  • JIS standard STK400—E—G (outer diameter: 42.7 mm x thickness: 1.2 mm, length: 150 mm) is used as a raw tube, which is used as four preforming rolls as shown in Fig. 1 (b).
  • Fig. 1 (b) was preformed into a square tube having a cross section of 37. Ommx 37.0 mm as shown by reference numeral 73 in Fig. 6 (b).
  • 4 Ommx 40 mm square steel pipe 60 (thickness: 1.6 mm, outer circumference: 134 mm, length: 15 Omm), 4 pieces as shown in Fig. 4 (a) and (b) As shown in Fig. 5, four molding dies, each of which has a vertical stripe pattern on its surface, are inserted in a state where a molding material having a concave and convex pattern on the surface is inserted. And then reduced in diameter to a round steel tube with an outer diameter of 4 Omm. After the completion of the diameter reduction, the mold was removed from the round steel pipe.
  • the outer circumference of the round steel pipe was 125.7 mm, and a pattern with a depth of about 0.2 mm corresponding to the concavo-convex pattern formed on the surface of the section was formed on the inner peripheral wall. Also, on the outer peripheral wall, a vertical stripe pattern having a depth of about 0.2 mm corresponding to the uneven pattern formed on the surface of the molding die was formed.
  • 53.5mmx 53.5mm square steel pipe (thickness: 1.2mm, outer circumference: 19 Omm, length: 15 Omm) to be the inner tube
  • JIS standard STK 400 -EG to be the inner tube
  • Outer diameter: 50.8mm x thickness: 1.2mm, length: 15 Omm A round steel pipe was inserted and used as the original pipe.
  • press forming was performed using four forming dies, and the outer tube (square steel tube) was reduced to an octagonal shape with an outer circumference of 187 mm.
  • the diameter of the outer pipe (square steel pipe) was reduced to a double pipe where the center of each side of the inner pipe (square steel pipe) and a part of the inner pipe (round steel pipe) were in contact.
  • Example 13 The double tube obtained in Example 13 was used as the original tube, and as shown in FIG. 7 (b), the diameter of the outer tube was reduced to 54 mm by press forming using eight forming dies. A double round tube was obtained.
  • JIS standard STK400-EG outer diameter: 63.5mmx thickness: 1.2mm, length: 150mm
  • round steel pipe 90 that becomes the inner pipe
  • a round steel pipe 91 (diameter: 60.5 mm x thickness: 1.2 mm, length: 150 mm) was inserted and used as the original pipe.
  • the preforming using four preforming rolls 92a, 92b, 92c, and 92d results in a 60 mm x 60 mm Preformed into square tubes.
  • the double pipe of Example 15 was used as a raw pipe, and as shown in FIG. 6 (a), four preformed holes were used to traverse the cross section indicated by reference numeral 73 in FIG. 6 (b). It was preformed into a square double tube with a face of 58.0 mm mx 58. Omm.
  • press molding was performed using four molding dies to obtain a double tube having an outer diameter of 58.5 mm and a thickness of 2.4 mm.
  • the double tube of Example 15 was used as a raw tube, and as shown in FIG. 6 (a), four preformed holes were used to traverse the cross section indicated by reference numeral 73 in FIG. 6 (b). It was preformed into a square double tube with a face of 57.0 m mx 57. Omm.
  • press forming is performed using four forming dies, the outer diameter is reduced to an octagonal cross section of 197.5 mm, and then press forming is performed using eight forming dies. I got a tube.
  • Example 18 The double pipe of Example 15 was used as a raw pipe, and as shown in FIG. 6 (a), four preformed holes were used to traverse the cross section as indicated by reference numeral 73 in FIG. 6 (b).
  • the surface is preformed into a square double tube with a surface of 57. Om mx 57. Omm, and then, similarly, by four preforming rolls, as indicated by reference numeral 73 in FIG. 6 (b). It was preformed into a square double tube with a cross section of 55.0 mm x 55.0 mm.
  • the double tube of Example 15 was used as a raw tube, and as shown in FIG. 6 (a), four pre-formed holes were used to traverse the cross section indicated by reference numeral 73 in FIG. 6 (b).
  • the surface is preformed into a square double tube with a surface of 57. Om mx 57. Omm, and then, similarly, by four preforming rolls, as indicated by reference numeral 73 in FIG. 6 (b). It was preformed into a square double tube with a cross section of 55.0 mm x 55.0 mm.
  • press forming is performed using four forming dies, the outer diameter is reduced to an octagonal cross section of 190.Omm, and then press forming is performed using eight forming dies, and the outer diameter is 55. I got a tube.
  • the cross section of the raw tube is triangular, and in each continuous cross section in the longitudinal direction from one end of the raw tube to the other end.
  • the shape was preformed in such a manner that the R at each vertex (corner) of the triangular shape gradually changed from one end of the original tube to the other end.
  • a triangular cross section with a side of 61 mm was formed. became.
  • One end is a round shape with an outer diameter of 6 Omm, the outer diameter gradually decreases toward the other end, and the other end has a round shape with an outer diameter of 49 mm.
  • the preformed tube is reduced in diameter by press forming, and the one end A round taper tube having an outer diameter of 60 mm and an outer diameter of the other end of 49 mm was obtained.
  • a mold material as shown in Figs. 4 (a) and (b), which is tapered from one end to the other end is preliminarily used. The tube was inserted into the formed tube to reduce the diameter.
  • the cold-reducing press forming method for metal pipes includes various methods for forming a raw metal pipe by roll forming using a pre-forming roll or pre-forming by press forming using a pre-forming die.
  • a reduced-diameter metal tube, a reduced-diameter metal tube having irregularities formed on the inner and / or outer circumference, or a reduced-diameter inner / outer double tube can be simply and Molding can be performed reliably.
  • the double pipe manufactured by the method proposed by the present invention can be formed into a double pipe only at a portion where the wall thickness is desired to be increased, it is necessary to provide an inexpensive alternative to such a steel pipe for tailored structure. Can be.
  • the metal pipe of the present invention (reduced diameter pipe or reduced diameter double pipe) manufactured by the method of the present invention is used as a raw pipe, and is again converted into a metal pipe having a circular, square or other irregular cross section.

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  • Engineering & Computer Science (AREA)
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Abstract

La présente invention concerne un procédé de moulage à la presse à froid avec réduction du diamètre d'un tube métallique qui comprend un processus de moulage avec réduction du diamètre permettant de réduire la longueur circonférentielle externe d'un tube métallique de départ présentant une section transversale non circulaire comparativement à la longueur circonférentielle externe de départ tout en moulant à la presse le tube de départ pour qu'il ait une section transversale différente de celle du tube de départ; et un procédé de moulage à la presse à froid avec réduction du diamètre qui se caractérise en ce qu'il comprend un processus de prémoulage d'un tube métallique de départ ayant une section transversale circulaire sous forme d'un tube ayant une section transversale différente de celle du tube de départ, par moulage-laminage au moyen d'un rouleau de prémoulage ou par moulage avec une première presse au moyen d'une matrice de prémoulage, et un processus de moulage avec réduction du diamètre permettant de réduire la longueur circonférentielle externe d'un tube métallique prémoulé comparativement à celle du tube métallique de départ tout en remoulant le tube métallique prémoulé de sorte qu'il ait une section transversale différente de celle du tube métallique prémoulé à l'aide d'une deuxième presse comprenant une matrice de moulage.
PCT/JP2003/004269 2002-04-03 2003-04-03 Procede de moulage a la presse a froid avec reduction du diametre WO2003082495A1 (fr)

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AU2003236357A AU2003236357A1 (en) 2002-04-03 2003-04-03 Cold diameter reduction press molding method of metal pipe and metal pipe molded by that method

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JP2002101777A JP2003290849A (ja) 2002-04-03 2002-04-03 金属管の冷間縮径プレス成形法及びこれにより成形された金属管

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CN102133587A (zh) * 2011-01-11 2011-07-27 武穴市玉鼎工贸有限公司 一种异型管成型机
CN102720601A (zh) * 2012-04-26 2012-10-10 庄景阳 化油器主喷嘴支撑架

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FR2971722B1 (fr) * 2011-02-18 2014-01-17 Peugeot Citroen Automobiles Sa Procede de preparation de la surface exterieure d'une piece de revolution pour l'application d'un revetement, procede de revetement, vehicule et machine correspondants
CN104501634B (zh) * 2014-11-21 2017-04-26 东莞汉旭五金塑胶科技有限公司 铝管与热导管的封包方法及其封包管体结构
KR101809832B1 (ko) * 2015-04-20 2017-12-15 김태조 사다리 발판 요철성형 방법
KR102302232B1 (ko) * 2020-03-25 2021-09-14 주식회사 천일정밀 파이프 축관장치

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JPS466858B1 (fr) * 1967-05-16 1971-02-20
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JPS49123342U (fr) * 1973-02-24 1974-10-22
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JPS5378971A (en) * 1976-12-23 1978-07-12 Kubota Ltd Reduce process for diameter of pipe material by plastic working
JPH07155832A (ja) * 1993-11-30 1995-06-20 Nippon Steel Metal Prod Co Ltd テーパ角管の製造装置
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CN102133587B (zh) * 2011-01-11 2012-10-03 湖北玉鼎管业有限公司 一种异型管成型机
CN102720601A (zh) * 2012-04-26 2012-10-10 庄景阳 化油器主喷嘴支撑架

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