JP6913657B2 - Multi-winding tube molding device and multi-winding tube molding method - Google Patents

Description

The present invention relates to a multi-winding tube forming apparatus and a multi-winding tube forming method.

Conventionally, there has been known a molding apparatus in which a strip-shaped metal plate is wound into a roll using a plurality of pairs of molding rolls to form a multi-winding tube (see, for example, Patent Document 1).

In the molding apparatus of Patent Document 1, among a plurality of pairs of molding rolls, a pair of molding rolls located on the downstream side in the feeding direction of the metal plate and a mandrel processing portion arranged inside the rolled metal plate. The overlapped portion of the metal plate wound in a roll shape is pressed to bring the overlapped surfaces into close contact with each other.

Japanese Unexamined Patent Publication No. 11-342418

By the way, in Patent Document 1, the shape of the processed portion of the mandrel is a hump shape that is convex outward in the radial direction, and is wound in a roll shape between the maximum outer diameter portion of the processed portion and the pair of forming rolls. The overlapping part of the metal plate is pressed. Here, when the thickness of the metal plate varies, the pressing force acting on the overlapped portion of the metal plate wound in a roll shape tends to vary depending on the processed portion of the mandrel and the forming roll. If the pressing force varies in this way, the adhesion between the overlapping surfaces of the rolled metal plates may decrease. When the adhesion between the overlapped surfaces is lowered, voids (voids) may be generated between the overlapped surfaces of the metal plates wound in a roll shape in the heating process after the molding process.

In consideration of the above facts, the present invention is a multi-winding tube forming apparatus capable of uniformly approaching the pressing force on the overlapped portion of the rolled metal plates even if the thickness of the metal plates varies. An object of the present invention is to provide a method for forming a multi-winding tube.

In the multi-winding tube forming apparatus of the first aspect of the present invention, a plurality of pairs of forming rolls facing each other so as to sandwich the metal plate to be formed are arranged along the feeding direction of the metal plate, and a plurality of pairs are arranged. A multi-winding tube molding device that forms a rolled tube by bending the metal plate with the forming roll, and is arranged inside the metal plate that extends along the feed direction and is wound in a roll shape. A shaft that holds one end side located upstream of the feed direction, and a tapered portion that is provided on the other end side of the shaft opposite to the one end side and expands in diameter from upstream to downstream in the feed direction. The metal plate having a processed portion and a metal mandrel including the metal plate wound in a roll shape by the pair of forming rolls located on the downstream side in the feeding direction among the plurality of pairs of the forming rolls. The tapered portion of the processed portion is arranged at a position where it is sandwiched.

In the multi-winding tube forming apparatus of the first aspect, a metal plate is bent by a plurality of pairs of forming rolls and wound into a roll to form a winding tube. Then, among the plurality of pairs of forming rolls, the taper of the pair of forming rolls and the processed portion is at a position where the metal plate wound in a roll shape is sandwiched between the pair of forming rolls located on the downstream side in the feeding direction of the metal plate. The overlapped portion of the metal plate wound in a roll shape is pressed by the portion. Specifically, in the above-mentioned molding apparatus, the inner portion of the roll of the rolled metal plate is expanded while riding on the tapered portion of the processed portion, and the overlapped portion of the rolled metal plate is overlapped. In a state where the surfaces are in close contact with each other (in other words, in a close contact state), the overlapped portion of the metal plate wound in a roll shape by the pair of forming rolls and the tapered portion of the processed portion is pressed inside and outside the roll. Here, when the thickness of the metal plate varies and the thickness of the metal plate is thicker than the reference plate thickness, when the inner portion of the roll of the rolled metal plate rides on the tapered portion of the processed portion. The frictional force generated in the metal is large, and the tension acting on the shaft holding one end side is also large. When the tension acting on the shaft is large, the axial elongation (elastic elongation) of the metal shaft becomes large, and when the position of the tapered portion is the reference plate thickness, the feed direction of the metal plate (hereinafter, appropriately "feed") It is abbreviated as "direction".) It shifts downstream. When the position of the tapered portion shifts downstream in the feed direction in this way, the distance between the forming roll and the tapered portion increases, so that it acts on the overlapping portion of the metal plate wound in a roll shape between the forming roll and the tapered portion. The increase in pressing force is suppressed. On the other hand, when the thickness of the metal plate is thinner than the reference plate thickness, the frictional force generated when the inner portion of the roll of the rolled metal plate rides on the tapered portion of the processed portion is small and acts on the shaft. The tension also decreases. When the tension acting on the shaft is small, the axial elongation (elastic elongation) of the metal shaft becomes smaller than that of the reference plate thickness, and the position of the tapered portion shifts upstream in the feed direction. When the position of the tapered portion shifts upstream in this way, the distance between the forming roll and the tapered portion becomes shorter, which acts on the overlapping portion of the metal plate wound in a roll shape between the forming roll and the tapered portion. The drop in pressure is suppressed.
As described above, in the multi-winding tube forming apparatus of the first aspect, even if the thickness of the metal plates varies, the pressing force applied to the overlapped portion of the rolled metal plates can be made uniform. can.

The multi-winding tube forming apparatus of the second aspect of the present invention is the multi-winding tube forming apparatus of the first aspect, in which the processed portion extends from the end of the tapered portion to the opposite side of the shaft with the same diameter. It has a columnar part to be put out.

In the multi-winding tube forming apparatus of the second aspect, since the processed portion has a columnar portion extending from the end of the tapered portion to the opposite side of the shaft with the same diameter, for example, the tapered portion does not have the columnar portion. Compared to the case where the end has a sharp angle, the pressure acting on the end of the tapered portion is dispersed, and the wear of the mandrel due to the processing of the metal plate is suppressed.

The device for forming a multi-winding tube according to a third aspect of the present invention further comprises a moving device for moving the mandrel along the feeding direction in the device for forming a multi-winding tube according to the first or second aspect. The device has a holding portion that holds the one end side of the shaft and can move to the upstream side and the downstream side in the feeding direction, and a drive source for moving the holding portion.

In the multi-winding tube molding device of the third aspect, in order to further include a moving device for moving the mandrel along the feeding direction, the position of the tapered portion along the feeding direction is adjusted according to the reference plate thickness of the metal plate. Can be done. For example, by appropriately controlling the drive source, it is possible to automate the adjustment of the positional relationship between the pair of forming rolls and the processed portion before forming the metal plate.

The device for forming a multi-winding tube according to a fourth aspect of the present invention is the device for forming a multi-winding tube according to a third aspect, wherein the moving device includes a sensor for detecting tension acting on the shaft via the holding portion. It further includes a control unit that controls the drive source according to the tension detected by the sensor and adjusts the position of the holding unit along the feed direction.

In the multi-winding tube forming apparatus of the fourth aspect, the tension acting on the shaft is detected by a sensor, and the drive source is controlled by the control unit according to the tension detected by the sensor to hold the shaft in the feed direction of the holding unit. The position along is adjusted. That is, the positional relationship between the pair of forming rolls and the processed portion is automatically adjusted during the forming of the metal plate. As a result, in addition to the effect of the elastic elongation of the metal shaft described above, the pressing force on the overlapping portion of the rolled metal plates can be made uniform.

The apparatus for forming a multiple winding tube according to a fifth aspect of the present invention is a method for forming a multiple winding tube using the apparatus for forming a multiple winding tube according to any one of the first to fourth aspects, wherein a metal plate is formed. It is bent and wound into a roll shape, and the overlapped portion of the metal plate wound into a roll shape is pressed by the pair of the molding rolls located on the downstream side in the feeding direction of the metal plate and the tapered portion of the processed portion. ..

In the multi-winding tube forming apparatus of the fifth aspect, since the multi-winding tube forming apparatus of any one of the first to fourth aspects is used, even if the thickness of the metal plate varies, it is wound in a roll shape. The pressure applied inside and outside the roll to the overlapped portion of the metal plates that have been cut can be made uniform.

As described above, according to the present invention, even if there are variations in the thickness of the metal plates, a multi-winding tube forming apparatus capable of uniformly approaching the pressing force on the overlapping portion of the metal plates wound in a roll shape. And a method for forming a multi-winding tube can be provided.

It is a schematic block diagram of the molding apparatus of a multi-winding tube which concerns on one Embodiment of this invention. It is sectional drawing which cut the pair of molding rolls located at the most downstream in the feed direction of the metal plate of the multi-winding tube molding apparatus of FIG. 1 along the axial direction of a mandrel. It is a schematic block diagram which shows the operation of winding a metal plate in a roll shape by the molding apparatus of the multi-winding tube of FIG. FIG. 3 is a cross-sectional view of a pair of forming rolls located at the most downstream side in the feeding direction of the metal plate of the multi-winding tube forming apparatus of FIG. 3 cut along the axial direction of the mandrel. In the cross-sectional view shown in FIG. 4, it is a cross-sectional view showing a state in which the processed portion of the mandrel is displaced downstream in the feed direction of the metal plate due to an increase in the thickness of the metal plate. In the cross-sectional view shown in FIG. 4, it is a cross-sectional view showing a state in which the processed portion of the mandrel is displaced upstream in the feeding direction of the metal plate due to a decrease in the thickness of the metal plate. FIG. 7 is a cross-sectional view taken along the line 7X-7X of FIG. It is sectional drawing along the direction orthogonal to the axial direction of the multiple winding tube manufactured through the molding method of the multiple winding tube which concerns on one Embodiment of this invention. It is an enlarged sectional view of the metal plate used in the molding method of the multi-winding tube which concerns on one Embodiment of this invention. It is sectional drawing which shows the modification of the mandrel shown in FIG. 2 (cross-sectional view corresponding to FIG. 2). It is sectional drawing (cross-sectional view corresponding to FIG. 4) which shows the modification of the mandrel shown in FIG.

Hereinafter, an apparatus for forming a multi-winding tube and a method for forming a multi-winding tube according to an embodiment of the present invention will be described with reference to the drawings. The arrow M appropriately shown in each figure is the feed direction of the metal plate 52.

First, the multiple winding tube 50 manufactured by using the multiple winding tube forming apparatus (hereinafter, appropriately referred to as "molding apparatus") 20 of the present embodiment will be described, then the forming apparatus 20 will be described, and then the forming apparatus 20 will be described. , The molding method using the molding apparatus 20 will be described.

FIG. 8 shows the multi-winding tube 50 of the present embodiment. The multiple winding tube 50 is formed by winding a metal plate 52 in a roll shape and joining the overlapping surfaces of the overlapped portions. The multiple winding tube 50 of this embodiment is a double winding tube. Further, the multiple winding pipe 50 is used, for example, as a piping component (for example, a brake pipe) of a vehicle.

Further, as shown in FIG. 9, the metal plate 52 forming the multiple winding tube 50 is a coating material 56 formed of a core material 54 formed of a metal material and a metal material having a melting point lower than that of the core material 54. Is formed by covering. Further, the metal plate 52 is processed into a strip shape, and the longitudinal direction of the metal plate 52 coincides with the axial direction (direction along the axis) of the multi-winding tube 50 after molding. Examples of such a metal plate 52 include a clad steel plate and a plated steel plate. As the metal material forming the core material 54 , iron, aluminum, or the like may be used. Further, as the metal material forming the covering material 56, copper, an aluminum alloy or the like used as a general brazing material may be used. Further, in the present embodiment, both sides of the core material 54 are covered with the covering material 56, but only one side of the core material 54 may be covered with the covering material 56. In the present embodiment, after the metal plate 52 is wound in a roll shape, the overlapped surfaces of the overlapped portions are joined by brazing to form the multi-winding tube 50.

Next, the molding apparatus 20 of this embodiment will be described.
<Molding equipment>
As shown in FIGS. 1 to 4, the molding apparatus 20 is an apparatus that performs roll forming (roll forming) by bending a metal plate 52 and winding it into a roll shape to form a pipe shape having a predetermined inner diameter.

The molding apparatus 20 includes a plurality of pairs of molding rolls 22 arranged along the feeding direction of the metal plate 52 (hereinafter, appropriately abbreviated as “feeding direction”), and a metal arranged along the feeding direction. It is equipped with a mandrel 24 made of metal.

(Molding roll)
As shown in FIGS. 1 and 3, in the plurality of pairs of forming rolls 22, a plurality of pairs of forming rolls 22 facing each other so as to sandwich the metal plate 52 to be formed are spaced apart from each other along the feeding direction. It is arranged and configured. The metal plate 52 is bent by these forming rolls 22 and wound into a roll shape.

Further, a plurality of pairs of auxiliary rolls 23 that assist in bending the metal plate 52 are arranged between the pair of forming rolls 22 that are adjacent to each other along the feeding direction.

Of the plurality of pairs of forming rolls 22, the pair of forming rolls 22A located at the uppermost stream in the feeding direction functions as a feeding roller that sandwiches the metal plate 52 wound around the drum 58 from both plate surface sides and sends it out in the feeding direction. ..

Further, among the plurality of pairs of forming rolls 22, the pair of forming rolls 22B located at the most downstream in the feeding direction is a superposition of the metal plates 52 wound in a roll shape with the tapered portion 28A of the mandrel 24 described later. It functions as a pressure roll that pressurizes the portion to bring the overlapping surfaces 52A and 52B into contact with each other without a gap. Further, each of the pair of forming rolls 22B is formed with a peripheral groove 25 into which a metal plate 52 wound in a roll shape is inserted. The peripheral groove 25 is formed continuously in the circumferential direction of the forming roll 22B for one round.

Of the plurality of pairs of forming rolls 22, the plurality of pairs of forming rolls 22C located between the pair of forming rolls 22A and the pair of forming rolls 22B gradually push the metal plate 52 from the upstream to the downstream in the feeding direction. It functions as a bending roll for bending into a roll and winding it into a roll.

(Mandrel)
As shown in FIGS. 1 and 3, the mandrel 24 has a shaft 26 and a machined portion 28.

The shaft 26 extends along the feed direction. Specifically, the shaft 26 extends from between the pair of forming rolls 22A and the pair of forming rolls 22C to just before the nip portion N of the pair of forming rolls 22B. With this configuration, a part of the shaft 26 (a portion on the downstream side in the feed direction) is arranged inside the metal plate 52 wound in a roll shape. The shaft 26 is made of a metal material (eg, iron). The nip portion N referred to here refers to a position where the metal plate 52 wound in a roll shape is sandwiched between the pair of forming rolls 22B located at the most downstream in the feeding direction.

Further, a disk-shaped spool portion 27 is formed on one end 26A side located upstream in the feed direction of the shaft 26 so as to project outward in the radial direction from the shaft 26. The shaft 26 is held by the holding portion 32 of the moving device 30, which will be described later, using the spool portion 27.

The processed portion 28 is provided on the other end 26B side (in the present embodiment, the other end 26B) located on the other end 26B side (the other end 26B in the present embodiment), which is opposite to one end 26A side of the shaft 26 and is located downstream in the feed direction. The processed portion 28 has a tapered portion 28A whose diameter increases from the upstream to the downstream in the feeding direction. Further, the processed portion 28 is formed of a metal material (for example, iron) and is joined to the other end 26B of the shaft 26 by welding.

Further, the position of the tapered portion 28A of the processed portion 28 along the feed direction of the mandrel 24 is controlled by the moving device 30 described later so as to be located at the nip portion N of the pair of forming rolls 22B.

As shown in FIGS. 1 and 3, the molding device 20 further includes a moving device 30 that moves the mandrel 24 along the feed direction.

The moving device 30 includes a holding unit 32, a drive source 34, a sensor 36, and a control unit 38.

The holding portion 32 is connected to a housing 31 that holds one end 26A side of the shaft 26 and is configured to be slidable along the feed direction. The holding portion 32 supports one end 26A side of the shaft 26 and moves together with the housing 31 along the feeding direction. The holding portion 32 is provided with an engaging portion (not shown), and this engaging portion engages with the spool portion 27 of the shaft 26. The mandrel 24 moves with the movement of the holding portion 32.

The drive source 34 is connected to the housing 31 via a ball screw mechanism (not shown) for sliding the housing 31. The drive source 34 supplies a driving force for moving the holding portion 32 together with the housing 31 along the feeding direction. As the drive source 34, for example, an electric motor (servo motor) may be used. The drive source 34 is controlled by the control unit 38.

The sensor 36 is arranged in the housing. The sensor 36 detects the tension acting on the shaft 26 via the holding portion 32. The information detected by the sensor 36 is transmitted to the control unit 38.

The control unit 38 controls the output (driving force) of the drive source 34 according to the information related to the tension detected by the sensor 36, and adjusts the position of the holding unit 32 in the feed direction. That is, the control unit 38 can adjust the position of the tapered portion 28A of the processed portion 28 in the feed direction.

<Molding method>
Next, a method of forming a multi-winding tube using the forming apparatus 20 of the present embodiment will be described.

First, before starting the molding of the multi-winding tube, the size (thickness, inner diameter, etc.) of the multi-winding tube to be molded is input from an operation unit (not shown) to a storage unit (not shown) of the control unit 38. Based on this size information, the control unit 38 controls the drive source 34 to arrange the tapered portion 28A of the machining portion 28 at the optimum position (optimal position in the feed direction) of the nip portion N of the pair of forming rolls 22B. do. This optimum position is predetermined by calculation based on size information or the like. Specifically, the control unit 38 sets the distance L2 (see FIG. 2) between the forming roll 22B and the tapered portion 28A to be the same as the thickness T of the peripheral wall portion of the multi-winding tube 50 input as size information. By controlling the drive source 34, the tapered portion 28A is arranged at an optimum position of the nip portion N of the pair of forming rolls 22B.
Further, based on the input information, the distance between the pair of forming rolls 22A, the pair of forming rolls 22B, the plurality of pairs of forming rolls 22C, and the plurality of pairs of auxiliary rolls 23 changes. For example, in the pair of forming rolls 22B, the distance L1 between the bottom surfaces of the peripheral groove 25 changes along the center line CL.

Next, the metal plate 52 is pulled out from the drum 58, and the tip end portion of the metal plate 52 is arranged between the pair of forming rolls 22A and sandwiched. The pair of forming rolls 22A rotate in synchronization with each other, and feed the sandwiched metal plate 52 from the upstream to the downstream in the feeding direction. The metal plate 52 sent out from the pair of forming rolls 22A is bent by a plurality of pairs of forming rolls 22C and a plurality of pairs of auxiliary rolls 23 and wound into a roll shape. At this time, the metal plate 52 is wound in a roll shape so as to surround the shaft 26 of the mandrel 24. Then, when the metal plates 52 pass through the plurality of pairs of forming rolls 22C, the metal plates 52 are wound into a roll shape with a gap in the overlapped portion.

Next, in the nip portion N of the pair of forming rolls 22B, the overlapped portion of the metal plate 52 wound in a roll shape is pressed by the pair of forming rolls 22B and the tapered portion 28A of the processed portion 28. Specifically, in the molding apparatus 20, as shown in FIG. 4, the roll inner portion of the metal plate 52 wound in a roll shape is expanded in diameter while riding on the tapered portion 28A of the processed portion 28, and is shown in FIG. The pair of forming rolls 22B and the tapered portion of the processed portion 28 are in a state where the overlapping surfaces 52A and 52B of the overlapping portion of the metal plate 52 wound in a roll shape are in contact with each other without a gap (in other words, in a close contact state). The overlapped portion of the metal plate 52 wound into a roll by 28A is pressed inside and outside the roll. Since the overlapped portion after pressurization is before joining, the metal plate 52 wound in a roll shape as shown in FIGS. 4 and 5 has a maximum diameter portion of the tapered portion 28A while expanding in diameter after pressurization. Go through.

Here, when the thickness of the metal plate 52 varies, and as shown in FIG. 5, the thickness T of the metal plate 52 is thicker than the reference plate thickness (in this embodiment, half of the input wall thickness). the large friction force occurs when the roll inner portion of the metal plate 52 wound into a roll rides on the tapered portion 28A of the processing unit 28, that acting on the shaft 26, one end 26A side is held Tsutomu Cho F Will also grow. When the tension F acting on the shaft 26 is large, the axial elongation (elastic elongation) of the metal shaft 26 is large, and when the position of the tapered portion 28A is the reference plate thickness (in other words, the nip portion N described above). When placed in the optimum position), it shifts downstream in the feed direction. When the position of the tapered portion 28A shifts downstream in this way, the distance L2 between the forming roll 22B and the tapered portion 28A is separated, so that the metal plate wound in a roll shape between the pair of forming rolls 22B and the tapered portion 28A. The increase in the pressing force acting on the overlapping portion of the 52 is suppressed.
On the other hand, as shown in FIG. 6, when the thickness T of the metal plate 52 is thinner than the reference plate thickness, the roll inner portion of the metal plate 52 wound in a roll shape rides on the tapered portion 28A of the processed portion 28. frictional force is small, which occurs when the even smaller Tsutomu Cho F that acting on the shaft 26, one end 26A side is held. When the tension F acting on the shaft 26 is small, the axial elongation (elastic elongation) of the metal shaft 26 is smaller than that of the reference plate thickness, and the position of the tapered portion 28A shifts upstream in the feeding direction. When the position of the tapered portion 28A shifts upstream in this way, the distance L2 between the pair of forming rolls 22B and the tapered portion 28A approaches, so that the metal plate wound in a roll shape between the forming roll 22B and the tapered portion 28A. The decrease in the pressing force acting on the overlapping portion of the 52 is suppressed.
As described above, in the molding apparatus 20, even if the thickness T of the metal plate 52 varies, the pressing force applied to the overlapped portion of the metal plate 52 wound in a roll shape can be made uniform.

The variation in the thickness of the metal plate referred to here includes the variation in the thickness due to a manufacturing error, the variation in the thickness when a metal plate whose thickness changes in the middle of the longitudinal direction is used as a specification, and the like.

Further, in the present embodiment, the moving device 30 is used, the tension F acting on the shaft 26 is detected by the sensor 36, and the drive source 34 is controlled by the control unit 38 according to the tension F detected by the sensor 36. The position of the holding portion 32 that supports 26 is adjusted along the feeding direction. Specifically, when the tapered portion 28A cannot be arranged at the optimum position of the nip portion N of the pair of forming rolls 22B only by the elastic elongation of the shaft 26, the moving device 30 takes into consideration the elastic elongation of the shaft 26. The tapered portion 28A is arranged at an optimum position of the nip portion N of the pair of forming rolls 22B. As a result, in addition to the effect of the elastic elongation of the metal shaft 26 described above, the pressing force on the overlapping portion of the rolled metal plates can be made uniform.

The metal plate 52 wound into a roll through the pair of forming rolls 22B is heated in the heating step of the subsequent step. By this heating, the overlapped portion of the metal plate 52 wound in a roll shape is joined by brazing, and the multi-winding tube 50 is manufactured. The multi-winding tube 50 manufactured in this manner is heated in a state where the overlapping surfaces 52A and 52B of the overlapping portion of the metal plate 52 wound in a roll shape are in close contact with each other (in other words, in a close contact state). Therefore, the generation of voids (voids) is suppressed between the overlapping surfaces 52A and 52B.

Next, the operation and effect of the multi-winding tube forming apparatus 20 of the present embodiment will be described.
In the molding apparatus 20, even if the thickness of the metal plate 52 varies as described above, the pressing force applied to the overlapped portion of the metal plate 52 wound in a roll shape can be made uniform.

Further, in the molding apparatus 20, since the tapered portion 28A is arranged at the optimum position of the nip portion N of the pair of molding rolls 22B, one type of mandrel 24 can correspond to a metal plate of a plurality of sizes (plate thickness). This makes it possible to reduce the types of mandrel 24. By reducing the types of mandrel 24 in this way, it is possible to reduce the work of installing the mandrel in the molding apparatus for each size of the metal plate.

Further, in order to further include the moving device 30, the molding apparatus 20 automatically adjusts the positions of the pair of forming rolls 22B and the tapered portion 28A of the processed portion 28 along the feeding direction before forming the metal plate 52. The tapered portion 28A can be arranged at an optimum position of the nip portion N of the pair of forming rolls 22B.

Further, in the molding apparatus 20, as described above, the moving apparatus 30 arranges the tapered portion 28A at the optimum position of the nip portion N of the pair of forming rolls 22B in consideration of the elastic elongation of the shaft 26. .. Therefore, in addition to the effect of the elastic elongation of the metal shaft 26 described above, the pressing force on the overlapped portion of the metal plate 52 wound in a roll shape can be made uniform.

In the molding apparatus 20 of the above-described embodiment, the processed portion 28 of the mandrel 24 has a tapered portion 28A, but the present invention is not limited to this configuration. For example, as in the mandrel 60 shown in FIGS. 10 and 11, the machined portion 62 may have a cylindrical portion 62B extending from the end of the tapered portion 62A to the opposite side of the shaft 26 with the same diameter. .. In this case, for example, as compared with the case where the end of the tapered portion has an acute angle without having the cylindrical portion 62B, the pressure acting on the end of the tapered portion 62A is dispersed, and the mandrel 24 accompanying the processing of the metal plate 52 Wear is suppressed.

In the above-described embodiment, the molding device 20 has the moving device 30, but the present invention is not limited to this configuration, and the molding device 20 may not have the moving device 30. In this case, the tapered portion 28A is arranged at the optimum position of the nip portion N only by the effect of the elastic elongation of the shaft 26.

Further, in the above-described embodiment, the tapered portion 28A of the processed portion 28 is arranged at the nip portion N of the pair of molding rolls 22B located at the most downstream in the feeding direction, but the present invention is not limited to this configuration. For example, the processing portion 28 is located on the nip portion N of the pair of molding rolls 22C (the second pair of molding rolls 22C from the most downstream) located on the downstream side in the feed direction and one upstream from the pair of molding rolls 22B. The tapered portion 28A may be arranged. In this case, the metal plate 52 wound in a roll shape can be pressed by the pair of forming rolls 22C second from the most downstream, and the fine adjustment of the pipe diameter can be performed by the pair of forming rolls 22B downstream.

Although the embodiments of the present invention have been described above with reference to the embodiments, these embodiments are examples and can be modified in various ways without departing from the gist. Needless to say, the scope of rights of the present invention is not limited to these embodiments.

20 Molding equipment (Multiple winding tube molding equipment)
22 Molding roll 22B Molding roll (Molding roll on the downstream side in the feed direction)
24 Mandrel 26 Shaft 26A One end 26B Other end 28 Machining part 28A Tapered part 30 Moving device 32 Holding part 34 Drive source 36 Sensor 38 Control part 50 Multiple winding tube 52 Metal plate 60 Mandrel 62 Machining part 62A Tapered part 62B Cylindrical part CL center line N Nip part M Feed direction

Claims (5)

A plurality of pairs of molding rolls facing each other so as to sandwich the metal plate to be molded are arranged along the feeding direction of the metal plate, and the metal plate is bent and wound into a roll by the plurality of pairs of the molding rolls. A multi-winding tube molding device that forms winding tubes.
A shaft that extends along the feed direction and is arranged inside the metal plate that is wound in a roll shape and holds one end side located upstream of the feed direction, and the other end of the shaft that is opposite to the one end side. It has a metal mandrel provided on the side and having a processed portion having a tapered portion that expands in diameter from upstream to downstream in the feed direction.
Among the plurality of pairs of the forming rolls, the tapered portion of the processed portion is located at a position where the metal plate wound in a roll shape is sandwiched between the pair of forming rolls located on the downstream side of the uppermost stream in the feeding direction. Arranged multi-winding tube molding device. The multi-winding tube molding apparatus according to claim 1, wherein the processed portion has a cylindrical portion having the same diameter from the end of the tapered portion and extending toward the opposite side of the shaft. A moving device for moving the mandrel along the feed direction is further provided.
1. The moving device has a holding portion that holds the one end side of the shaft and can move to the upstream side and the downstream side in the feeding direction, and a drive source for moving the holding portion. Alternatively, the apparatus for forming a multi-winding tube according to claim 2. The moving device controls the drive source according to the sensor that detects the tension acting on the shaft via the holding portion and the tension detected by the sensor, and follows the feeding direction of the holding portion. The multi-winding tube forming apparatus according to claim 3, further comprising a control unit for adjusting the position. A method for forming a multi-winding tube using the multi-winding tube forming apparatus according to any one of claims 1 to 4.
Bend the metal plate and wind it into a roll
A method for forming a multi-winding tube, which pressurizes an overlapping portion of the metal plates wound in a roll shape by a pair of the forming rolls located on the downstream side in the feed direction of the metal plate and the tapered portion of the processed portion. ..

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