JP5116367B2 - Single pipe roll tube forming apparatus and single pipe roll pipe forming method - Google Patents

Description

  The present invention relates to a single tube roll tube forming apparatus and a single tube roll tube forming method for forming a workpiece cut into a predetermined length into a cylindrical single tube.

  When manufacturing a metal pipe having a predetermined length, a method is known in which both ends of a metal plate are brought into contact with each other and formed into a roll shape, and then the butt portion is welded. By cutting a long roll formed by this method into a predetermined length, a metal diameter pipe as a product is obtained.

  As an apparatus for forming a metal plate into a roll shape, there is an apparatus that performs press working using a U-shaped and O-shaped mold. In this apparatus, a metal plate is molded into a U shape with a U-shaped mold and then formed into a roll with an O-shaped mold. In order to form a metal plate into a roll shape by pressing, it is necessary to deform the metal plate along the inner wall surface of the mold by its elastic force, and sufficient elastic force is generated in the metal plate as a material. A certain degree of thickness is required. Therefore, a thin metal plate cannot be processed into a roll shape by pressing.

Therefore, as an apparatus for forming a thin metal plate into a roll shape, there is a device that performs bending using a drum-shaped forming roller (see, for example, Patent Document 1). The metal plate is passed through a conveying path in which a plurality of forming rollers each having two to three forming rollers are arranged side by side, and the metal plate is bent along the circumferential surface of the forming roller. As the plurality of forming rollers are arranged on the downstream side in the transport direction, the sandwiching angle in the axial direction is narrowed to reduce the curvature of the recess.
Japanese Patent Laid-Open No. 11-221621

  However, in the conventional pipe making apparatus using the forming roller, the inner side of the metal plate was not supported at all when the thin metal plate was bent into a roll shape while pressing from the outer surface of the forming roller. . For this reason, a thin metal plate with insufficient elasticity is more easily deformed inward than a circular shape with a desired diameter, and a long roll can be formed from a long metal plate. A single tube roll cannot be produced from a metal plate cut to length. For this reason, in order to manufacture the single tube roll of predetermined length, it was necessary to cut | disconnect a elongate roll, and there existed a problem which the management of a manufacturing process and material became complicated.

  An object of the present invention is to convey a metal plate together with a shaft body between a plurality of pairs of rollers while pressing the cylindrical shaft body on the upper surface of the metal plate cut to a predetermined length. An object of the present invention is to provide a single-pipe roll pipe-forming apparatus and a single-pipe roll pipe-forming method that can be formed into a roll-like single-pipe roll having a high roundness using a thin metal plate that has been cut into pieces.

  In order to solve the above problems, a single-pipe roll pipe making apparatus of the present invention includes a plurality of lower rollers, a plurality of upper rollers, and a shaft body. The plurality of lower rollers and the plurality of upper rollers are arranged along a conveying direction perpendicular to the axial direction with their respective axial directions parallel to each other. The plurality of lower rollers have a drum shape in which the diameter of the central portion in the axial direction is smaller than the diameters of both end portions, and are positioned on the downstream side in the conveyance direction of the workpiece (a thin metal plate cut to a predetermined length) The one includes a plurality of forming rollers having a narrower sandwich angle in the axial direction. The plurality of upper rollers include a plurality of pressing rollers that press the shaft body against the plurality of forming rollers. The shaft body has a cylindrical shape, is placed on the work, and is transported along with the work with the longitudinal direction parallel to the transport direction between the plurality of lower rollers and the plurality of upper rollers.

  In this configuration, the plurality of upper rollers are arranged above each of the plurality of lower rollers located in a range excluding the intermediate portion in the transport direction among the plurality of lower rollers, and provided with a moving body and a drive mechanism. It may be a thing. The moving body is reciprocally movable along the transport direction, and includes a holding portion that holds the exposed portion. The drive mechanism moves the moving body in the conveyance direction at the same speed as the conveyance speed of the workpiece and the shaft body by the plurality of lower rollers and the plurality of upper rollers.

  In these configurations, a thin metal plate workpiece cut to a predetermined length is conveyed along a predetermined conveyance direction between a plurality of lower rollers and a plurality of upper rollers in a state where the upper surface is pressed by a shaft body. Is done. During this time, the workpiece is brought into contact with the circumferential surface of the forming roller, which is gradually narrowed in the axial direction, and is finally formed into a roll-shaped single pipe by abutting both ends parallel to the conveying direction by bending. . By setting the outer diameter of the shaft body equal to the inner diameter of the single pipe to be manufactured, the workpiece is supported by the shaft body from the inside during bending, and the workpiece does not deform into a circular inside.

  According to the present invention, a thin metal plate workpiece cut to a predetermined length is moved along a predetermined conveying direction between a plurality of lower rollers and a plurality of upper rollers in a state where the upper surface is pressed by a shaft body. By transporting and making a roll-shaped single pipe by abutting both ends parallel to the transport direction during bending, the work can be supported by the shaft from the inside during bending, and the work is supported by the lower roller And it can prevent deform | transforming inward rather than each surrounding surface of an upper roller. A thin metal plate cut to a predetermined length can be used as a material to form a roll with high roundness.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a single-pipe roll pipe making device according to a first embodiment of the present invention. FIG. 2 is a front view of the single-pipe roll pipe making device according to the first embodiment.

  As an example, the single-pipe roll pipe making apparatus 1 according to the first embodiment forms a single-pipe roll having an inner diameter of 103 mm using a 1.2 mm-thick stainless steel sheet cut to a length of 1280 mm as a workpiece. The single-pipe roll pipe making apparatus 1 includes, for example, 14 lower rollers 11 to 24, 14 upper rollers 31 to 44, a motor 2, a chain drive unit 3, and a shaft body 4.

  The lower rollers 11 to 24 are arranged at equal intervals along a horizontal conveyance direction X with their respective rotation axes parallel to each other and orthogonal to the rotation axis. For example, the lower rollers 11 to 24 are arranged at a pitch of 457.2 mm. The upper rollers 31 to 44 are arranged vertically above the lower rollers 11 to 24 with their respective rotational axes parallel to each other and parallel to the respective rotational axes of the lower rollers 11 to 24. The rotation shafts of the lower rollers 11 to 24 and the upper rollers 31 to 44 are supported by the frame 6. For example, the lower rollers 11 to 24 and the upper rollers 31 to 44 are made of die steel such as SKD11.

  The motor 2 is fixed to the frame 6. A sprocket 2 </ b> A is fixed to the rotating shaft of the motor 2.

  The chain drive unit 3 includes sprockets 3A, 3B, 3C and chains 3D, 3E. The chain 3D is stretched between the sprocket 2A and the sprocket 3A. The chain 3E is stretched between the sprocket 3B and the sprocket 3C. The sprocket 3A and the sprocket 3B are fixed on the same axis.

  Sprockets 11A to 24A are fixed to the respective rotation shafts of the lower rollers 11 to 24. The sprockets 11A to 24A mesh with the chain 3E.

  The rotation of the rotating shaft of the motor 2 is transmitted to the rotating shafts of the lower rollers 11 to 24 through the sprocket 2A, the chain 3D, the sprocket 3A, the chain 3E, and the sprockets 11A to 24A. The lower rollers 11 to 24 rotate at the same speed.

  FIG. 3 is a front view of each roller provided in the single-pipe roll pipe making apparatus. The upper roller 31 conveys the workpiece 100 along the conveyance direction X between the upper roller 31 and the lower roller 11. The upper roller 32 presses the shaft body 4 toward the peripheral surface of the lower roller 12, and transports the shaft body 4 along the transport direction X between the lower roller 12.

  The shaft body 4 is placed on the upper surface of the workpiece 100. As an example, the shaft body 4 is made of SCM435 (alloy steel for machine structure) having a length longer than the cutting length of the workpiece 100. The shaft body 4 has a hollow or solid cylindrical shape with an outer diameter equal to the inner diameter of a single tube roll as a product.

  The upper roller 33 bends both ends of the workpiece 100 in the axial direction Y (a direction orthogonal to the transport direction X) between the upper roller 33 and the lower roller 13.

  The upper rollers 34 to 44 press the shaft body 4 toward the peripheral surfaces of the lower rollers 14 to 24. The upper rollers 34 to 39 have a drum shape whose cross-sectional shape is an arc that is equal to the outer diameter of the shaft body 4, and have the same shape.

  Each of the lower rollers 14 to 19 has a drum shape in which the diameter of the intermediate part in the axial direction Y is smaller than the diameters of both end parts. The cross-sectional shape of the lower rollers 14 to 19 is configured by an arc whose central portion in the axial direction Y is equal to the outer diameter of the single tube roll. In the arc, two straight lines inclined toward both ends in the axial direction Y are continuous. The angle between the two straight lines in the cross-sectional shapes of the lower rollers 14 to 19 is made narrower as the lower roller is located downstream in the transport direction X. For example, the sandwiching angles of the lower rollers 14 to 19 are set to 160 °, 120 °, 90 °, 60 °, 20 °, and 0 °, respectively. The length of the circular arc in the cross-sectional shape of the lower rollers 14 to 19 is made longer as the lower roller on the downstream side in the transport direction X, and the lower roller 19 is a semicircle.

  The workpiece 100 is sequentially conveyed between the upper rollers 34 to 39 and the lower rollers 14 to 19 so that the lower surface (outer peripheral surface) is along the peripheral surface of the lower rollers 14 to 19 and the upper surface (inner peripheral surface). ) Is bent in a state where both end portions in the axial direction Y are lifted upward so as to be along the outer peripheral surface of the shaft body 4.

  The upper roller 40 is configured by dividing the roller 40A and the roller 40B into two in the axial direction Y. The rollers 40 </ b> A and 40 </ b> B have a shape in which a truncated cone whose central axis is parallel to the axial direction Y has a small diameter portion at the central portion side. The lower roller 20 has a circumferential surface that is a semicircular arc that is equal to the outer diameter of a single tube roll that is a product. The workpiece 100 is bent inward between the upper roller 40 and the lower roller 20 with both ends in the axial direction Y coming into contact with the peripheral surface of the upper roller 40.

  The upper roller 41 is formed in a shape in which the respective small diameter portions are in contact with two truncated cones whose central axis is parallel to the axial direction Y in the axial direction Y. The sandwiching angle on the peripheral surface of the upper roller 41 is narrower than the sandwiching angle on the peripheral surface of the upper roller 40. The lower roller 21 has the same shape as the lower roller 20. The workpiece 100 is bent between the upper roller 41 and the lower roller 21 such that both end portions in the axial direction are in contact with the peripheral surface of the shaft body 4.

  The upper rollers 42 to 44 have a semicircular arc and a circumferential surface. The semicircular arc of the peripheral surface of the upper roller 44 located on the most downstream side in the transport direction X is equal to the outer diameter of the single tube roll that is the product. The lower rollers 22 to 24 have the same shape as the lower roller 20. The workpiece 100 is sequentially conveyed between the upper rollers 42 to 44 and the lower rollers 22 to 24, so that the outer peripheral surface is along the peripheral surfaces of the upper rollers 42 to 44 and the lower rollers 22 to 24. The surface is bent into a substantially perfect circle so that the surface follows the outer peripheral surface of the shaft body 4.

  The workpiece 100 is sequentially bent together with the shaft body 4 between the upper rollers 31 to 44 and the lower rollers 11 to 24 to be gradually bent from a flat plate shape to a single tube roll shape. At this time, the shaft body 4 is always located inside the workpiece 100. For this reason, even if the workpiece 100 is a thin plate cut to a predetermined length and does not have sufficient elastic force, the workpiece 100 is crushed in the vertical direction by the single-pipe roll pipe making device 1. However, a substantially perfect single tube roll can be formed.

  Note that the number of arrangement of the upper rollers 34 to 39 and the lower rollers 14 to 19 and the number of arrangement of the upper rollers 42 to 44 and the lower rollers 22 to 24 are not limited to the above example.

  FIG. 4 is a front view of a main part of a single-pipe roll pipe making device according to the second embodiment of the present invention. FIG. 5 is a side view of the main part of the single-pipe roll pipe making device according to the second embodiment. The single-pipe roll pipe making device 200 according to the second embodiment includes upper rollers 231, 232, 234 and a moving body 205 instead of the upper rollers 31 to 44 of the single-pipe roll pipe making device 1. In the single-pipe roll pipe making device 200, the lower rollers 22 to 24 for sizing among the lower rollers 11 to 24 of the single-pipe roll pipe making device 1 are omitted. Further, the outer diameter of the shaft body 4 is slightly larger than the inner diameter of the single tube roll as a product. The single pipe roll pipe-formed by the single pipe roll pipe forming apparatus 200 is finished to the inner diameter of the single pipe roll that becomes a product in the compression process of the next process.

  The upper roller 231 functions in the same manner as the upper roller 31 and transports the workpiece 100 along the transport direction X. The upper roller 232 functions in the same manner as the upper roller 33 and bends both ends of the workpiece 100 in the axial direction Y (direction orthogonal to the transport direction X) between the upper roller 232 and the lower roller 13. The upper roller 234 includes rollers 234A and 234B that are supported around an axis parallel to an axial direction Z orthogonal to the transport direction X and the axial direction Y. The peripheral surfaces of the rollers 234A and 234B are configured by approximately ¼ arcs having a diameter substantially equal to the outer diameter of the single tube roll as a product. Between the roller 234A and the roller 234B, a gap through which a holding portion 251 described later passes is provided.

  The moving body 205 includes a holding portion 251 that holds a part of the upper end of the shaft body 4. The moving body 205 is reciprocally movable along the transport direction X above the lower rollers 11 to 21 via, for example, a rail 300 arranged in parallel with the transport direction X. The moving body 205 is fixed to a part of a chain 301 stretched in a loop shape by sprockets 302 and 303. The rotation of the motor 304 is transmitted to the sprocket 302. The moving body 205 moves in the transport direction X direction from the position at which the shaft body 4 faces the lower roller 11 to the position at which the shaft body 4 faces the lower roller 21 at the same speed as the transport speed of the workpiece 100.

  In the single-pipe roll pipe making apparatus 200, the shaft body 4 held by the moving body 205 is moved together with the workpiece 100 in the conveyance direction X while the workpiece 100 is being conveyed by driving the lower rollers 11 to 21. Thereby, the upper surface (inner side surface) of the workpiece 100 can be bent so as to be in close contact with the peripheral surface of the shaft body 4, and can be formed into a single tube roll. A gap through which the holding portion 251 passes along the transport direction X is formed on the peripheral surface of the single pipe roll piped by the single pipe roll pipe forming apparatus 200. In the next compression step, the single tube roll is contracted so as to close this gap.

  When the workpiece 100 and the shaft body 4 pass between the upper roller 234 and the lower roller 21, the motor 304 is rotated in the reverse direction, and the moving body 205 is moved back to a position where the shaft body 4 faces the lower roller 11. At this time, by moving the moving body 205 at a higher speed than when the moving body 205 moves forward, the tact time can be shortened and the working efficiency can be improved.

  As described above, even when the single-pipe roll manufacturing apparatus 200 is a thin plate cut to a predetermined length and does not have sufficient elastic force, it is pushed up and down. A substantially circular single tube roll can be formed without being crushed.

  In addition, the shaft body 4 is made sufficiently longer than the length of the workpiece 100 in the transport direction X, and a portion of the shaft body 4 exposed from the downstream end or the upstream end of the workpiece 100 is held by the holding portion 251. It may be. Thereby, it is possible to prevent the gap in the transport direction X from being formed on the peripheral surface of the single tube roll, and it is possible to omit the subsequent compression step.

  In addition, all said embodiment is an example, This invention is not limited to these, A various change can be added within the scope of this invention.

It is a side view of the single pipe roll pipe making apparatus concerning a 1st embodiment of this invention. It is a front view of the single pipe roll pipe making apparatus. It is a front view of the single pipe roll pipe making apparatus which concerns on the 1st embodiment. It is a front view of each roller with which the single pipe roll pipe making apparatus is equipped. It is a front view of the principal part of the single pipe roll pipe manufacturing apparatus which concerns on 2nd Embodiment of this invention. It is a side view of the principal part of the single pipe roll pipe making apparatus which concerns on the 2nd embodiment.

Explanation of symbols

1,200 Single-pipe roll pipe making device 2 Motor 3 Chain drive part 4 Shaft body 11-24 Lower roller 31-44 Upper roller 205 Moving body 251 Holding part

Claims (3)

A plurality of lower rollers disposed parallel to each other in the conveying direction perpendicular to the axial direction, and a plurality of upper rollers disposed above each of the plurality of lower rollers, The thin metal sheet workpiece cut into a predetermined length is conveyed along the predetermined conveying direction between the plurality of lower rollers and the plurality of upper rollers, and is bent by the conveying direction. A single-pipe roll pipe-making device for making a roll-like single pipe by matching both ends parallel to each other,
A columnar shaft that is placed on the workpiece and conveyed with the workpiece with the longitudinal direction parallel to the conveying direction between the plurality of lower rollers and the plurality of upper rollers,
The plurality of lower rollers have a drum shape in which the diameter of the central portion in the axial direction is smaller than the diameters of both end portions, and a plurality of lower rollers have a smaller pinching angle in the axial direction as they are located on the downstream side in the transport direction. Including forming rollers,
The plurality of upper rollers includes a plurality of press rollers that press the shaft against the plurality of forming rollers. A plurality of lower rollers arranged along the conveying direction perpendicular to the axial direction with the respective axial directions being parallel to each other, wherein the diameter of the central portion in the axial direction is smaller than the diameter of both end portions And a plurality of lower rollers including a plurality of forming rollers with a smaller pinching angle in the axial direction as it is located on the downstream side in the transport direction,
A plurality of upper rollers disposed above each of the plurality of lower rollers located in a range excluding an intermediate portion in the transport direction among the plurality of lower rollers;
A cylindrical shaft body that is placed on the workpiece and is conveyed with the workpiece with the longitudinal direction parallel to the conveying direction between the plurality of lower rollers and the plurality of upper rollers;
A movable body that is reciprocally movable along the conveying direction, and a movable body that includes a holding unit that holds the shaft body;
A drive mechanism for moving the movable body in the transport direction at the same speed as the work speed of the workpiece and the shaft body by the plurality of lower rollers and the plurality of upper rollers,
Both ends parallel to the conveying direction are bent by a bending process while the workpiece of the thin metal plate cut to a predetermined length is conveyed along the conveying direction between the plurality of lower rollers and the plurality of upper rollers. A single pipe roll pipe making device that makes a single pipe in a roll shape. A plurality of lower rollers disposed on a metal sheet workpiece cut to a predetermined length along a conveying direction perpendicular to the axial direction with the respective axial directions parallel to each other, and the plurality of lower rollers to pipe-making of the respective plurality of upper rollers located above, during the transport along the conveying direction between, the single pipe rolled against parallel across the transport direction by bending A method of making a single pipe roll,
A cylindrical shaft body that is placed on the workpiece and is conveyed along with the workpiece with a longitudinal direction parallel to the conveying direction between the plurality of lower rollers and the plurality of upper rollers; The plurality of lower rollers including a plurality of forming rollers having a drum shape in which the diameter of the central portion is smaller than the diameters of both end portions, and having a narrower sandwich angle in the axial direction as being located downstream of the conveyance direction And a plurality of upper rollers including a plurality of presser rollers that press the shaft body against the plurality of forming rollers,
After the cylindrical shaft body is placed on the work with the longitudinal direction parallel to the transport direction, the work body and the shaft body are moved to the plurality of lower rollers in a state where the shaft body is pressed against the work. And a method of making a single pipe roll conveyed between the plurality of upper rollers.

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