JP3656177B2 - Multi-winding tube manufacturing method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pipe manufacturing technique by brazing or diffusion bonding, and more specifically, using a metal strip (hoop material) having or not having a brazing material or a diffusion material plating layer on at least one surface in advance. The present invention relates to a method and an apparatus for manufacturing a multi-winding tube by brazing or diffusion bonding between respective walls.
[0002]
[Prior art]
As a method for forming a multi-winding tube such as a double winding tube, a triple winding tube, or a quadruple winding tube from a metal strip, a method of forming a multi-winding tube by winding a metal strip is common. As a conventional method for forming a multi-winding tube employing this method, for example, there is a forming method generally referred to as a bandy method in which roll forming is performed sequentially from the inner peripheral side with a multi-stage forming roll. In this bandy method, in the feed direction of the metal strip formed on the multiple winding tube, a guide roll of the metal strip, and a number of pipe making or forming rolls for forming the metal strip from a plate shape to multiple windings, In this method, a metal strip is formed into a multi-winding tube by a molding device composed of a rod with a swimmer (core metal) arranged on the guide roll side of the metal strip in order. is there.
[0003]
That is, with this method, the metal strip with the edge part beveled is introduced into a large number of forming rolls by the guide roll, and with a swimmer inserted from both edge parts that are still released in the forming roll process A metal strip is formed into a multi-winding tube shape while being wound by a large number of forming rolls along the circumferential surface of the rod, and then the walls of the multi-winding tube are tightened by a shaping roll to be shaped and finished. It has become so.
[0004]
On the other hand, in US Pat. No. 2,998,047, a metal material hoop is moved in the longitudinal direction, while half of the longitudinal direction of the hoop is crossed in the relative direction and wound in a substantially object relation, There is disclosed a method of forming a multi-winding tube so that when wrapping the hoop material over about 720 degrees, each half of the longitudinal direction wraps over about 360 degrees.
[0005]
[Problems to be solved by the invention]
However, the conventional method of forming a multi-winding tube using the bandy method is a method of performing multi-winding by sequentially forming a roll from the inner peripheral side of the tube. Even in the case of forming a heavy-wound tube, the forming process is composed of multi-stage forming rolls of about 20 sets, both large and small. However, it takes a lot of labor and time to pass the material. In addition, despite the fact that a large amount of lubricating oil is applied to a large number of forming rolls, the degree of wear of the rolls differs depending on the rolls at each stage, so the management of the degree of wear of all the forming rolls is extremely troublesome. However, it is difficult to adjust the tightening force of the forming roll. Also, with respect to the pipe manufacturing method of the above-mentioned U.S. Patent, similarly to the bandy method, the hoop material is moved in the longitudinal direction and wound with a roller while using a large amount of lubricating oil and wrapped to form a multiple winding wall. Since this method is used, there is a drawback that the entire apparatus becomes long or large.
[0006]
The present invention has been made to eliminate the disadvantages of the prior art, and by simplifying the multiple winding forming process, the forming work efficiency is improved, the forming roll management is simplified, and the roll tightening force is improved. An object of the present invention is to provide a method and an apparatus for manufacturing a multi-winding tube capable of simplifying and speeding up adjustment work and reducing the amount of lubricating oil used.
[0007]
[Means for Solving the Problems]
The present invention employs a method of winding from one side of the hoop as a means for simplifying the multiple winding forming process, and the gist of the present invention is to form a multiple wound tube by brazing or diffusing a metal strip. In the manufacturing method of the multi-winding tube to be joined, the metal band material beveled at the edge part is wound from one side part of the band material from a plate shape with a forming roll and formed into a single winding and the other side part is semicircular Next, the other side of the semicircular shape that becomes the outer wall of the single-wound tube formed inside is formed into a multi-winding tube shape while reducing the diameter with a die, and the multiple-winding tube is multiplexed with a roll. It is characterized by tightening between the walls of the wound tube and then brazing or diffusion bonding.
[0008]
That is, in this method, when forming into multiple windings with a die, the metal strip is wound from one side of the metal strip first with a plurality of forming rolls so that the entire surface of the metal strip is not in contact with the inner peripheral surface of the die. The wound tube is formed and then passed through a die. If the entire surface of the metal strip contacts the entire inner peripheral surface of the die in the molding process, a large amount of lubricant is required to prevent seizure and wear, and the lubricant is used during brazing or diffusion bonding in the subsequent process. It is necessary to remove carbon contained in. However, if the method of winding from one side of the metal strip material is used, the entire surface of the metal strip does not contact the entire inner peripheral surface of the die in the molding process, so use of a lubricant to prevent seizure and wear. Not only does the amount become small, brazing or diffusion bonding is facilitated, but no extra force is applied to the metal strip, there is little residual fatigue stress, and the occurrence of scratches and the like of the metal strip can be prevented. For this reason, in the present invention, a method of winding from one side of the metal strip material is taken before forming into multiple windings with a die.
[0009]
In addition, as an apparatus for carrying out the method of the present invention, a metal strip having a beveled edge portion is wound from one side portion of the strip from a plate shape, and the other side portion is semicircular. A plurality of forming rolls that are formed into a single-winding tube, a die with a taper hole that is formed into a multi-turn tube shape while reducing the diameter of the other side of the semicircular shape that forms the outer wall of the single-winding tube formed inside, and the multiple The gist of the present invention is a device comprising a shaping roll for tightening between the walls of a wound tube, wherein the single roll forming roll, the die with a tapered hole, and the shaping roll are arranged on the same line. In addition, it is preferable to use a cored bar with a swimmer together with a shaping roll in order to tighten between the walls of the multi-winding tube.
[0010]
According to the apparatus of the present invention, a plurality of forming rolls are wound in a circular shape from one side of the metal strip, and the other side of the metal strip is formed in a semicircular shape by a die with a tapered hole. The diameter is reduced while being squeezed and formed into a multi-winding tube shape. Finally, the multiple winding tube is formed by tightening so that the walls of the multiple winding tube are brought into close contact with each other by the combined use of the shaping roll and preferably the cored bar.
[0011]
Japanese Patent Laid-Open No. 7-39932 discloses a die with a tapered hole in which a through-hole having a circular cross section having a tapered portion on the inlet side that decreases in diameter as it goes from the inlet side to the outlet side. A method of forming a flat metal band (hoop material) into a tubular shape (single-wound tube) at once is disclosed, but in this method, both side edges of the hoop are worn or crushed. For example, a lubricant obtained by diluting fluororesin powder mainly composed of polytetrafluoroethylene with Freonsolve is required, but such a lubricant is not only expensive, but this type of lubricant contains a large amount of carbon. Therefore, when such a lubricant is used in the brazing pipe manufacturing method, it is necessary to sufficiently remove this carbon at the time of brazing in the subsequent process, which inevitably increases the number of processes and increases the production cost. Is expensive There is a cormorant drawbacks. Furthermore, the method of forming a hoop material into a tubular shape at a time has a drawback such as a sudden stress applied in the width direction of the hoop material, and the production of a multi-winding tube by brazing or diffusion bonding which is the object of the present invention. Not applicable.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS. Here, the production of a double-wound tube will be described as an example.
FIG. 1 is a schematic diagram showing an apparatus configuration example of a multiple-winding tube manufacturing apparatus according to the present invention, and FIG. 2 is a schematic diagram showing a cross-sectional shape in each step when a double-winding tube is formed by the above-described apparatus. Is a cross-sectional view showing a metal strip that has been beveled in the first step of FIG. 1, and FIG. 1 is a cross-sectional view of a forming roll part. 2 is a cross-sectional view of the forming roll part. 3 is a cross-sectional view of the forming roll part. 4 is a cross-sectional view of the forming roll part. 5 is a sectional view of the forming roll part, (g) is a sectional view of the part A in the second step of FIG. 1, (h) is a sectional view of the part B in the second step, and (i) is a sectional view of the second part. FIG. 3 is a longitudinal side view showing the second step in an enlarged manner, FIG. 4 is a longitudinal front view showing the third step in an enlarged manner, and 1 is between each wall when forming a multi-winding tube A brazing material or brazing material for brazing or diffusion bonding is preferably a metal strip with or without a plating layer provided on both sides, 2 is a beveling roll, 3-1 to 3-5 are single No. 3-1 is a winding tube forming roll. No. 1 molding roll, 3-2 is No. No. 2 forming rolls, 3-3 No. 3 forming rolls, 3-4 are No. No. 4 molding roll, 3-5 is No.4. 5 forming rolls, 4 is a drawing die with a tapered hole for forming a double winding tube, 5 is a double winding tube shaping roll, 6 is a cored bar with a swimmer 6-1, 11 is a single winding tube, 12 is a double winding tube, 12-1 is a double wall tube.
[0013]
The beveling roll 2 is a processing roll for cutting the edge portion of the metal strip 1 obliquely at a predetermined angle so as not to cause a step on the inner peripheral surface and the outer peripheral surface of the double-winding tube. . No. The one forming roll 3-1 is composed of a pair of rolls 3-1a and 3-1b whose circumferential side surfaces are formed in an arc shape. No. 2 forming roll 3-2 is composed of a roll 3-2a having an arcuate circumferential side and a roll 3-2b with an arcuate caliber. 3 forming roll 3-3 consists of rolls 3-3a and 3-3b with arc-shaped calibers having different diameters. No. 4 forming roll 3-4 consists of rolls 3-4a and 3-4b with arc-shaped calibers having different diameters. The 5 forming rolls 3-5 are composed of arc-shaped caliber-equipped rolls 3-5a and 3-5b having different diameters.
[0014]
As shown in an enlarged view in FIG. 3, the double-pipe forming tapered die 4 with a tapered hole has a through-hole 4-1 having a substantially circular cross section with a taper that decreases in diameter from the entry side to the exit side. A die that has been drilled. The double wound tube shaping roll 5 is composed of a pair of upper and lower caliber-equipped rolls 5-1.
[0015]
Next, a process for forming a double-wound tube by the above apparatus will be described.
The metal strip 1 guided and fed by a guide roll or the like (not shown) is first beveled at the edge by the beveling roll 2 in the first step of FIG. Next, No. of the same process. 1 Forming rolls 3-1 to No. 1 No. 3 forming roll 3-3, both side portions of the metal strip 1 are gradually bent into arc shapes having different curvature radii. No. 4 molding roll 3-4 is wound with the arc having the smaller radius of curvature. The same part is wound inward by the 5 forming rolls 3-5, and the single winding tube 11 which becomes the innermost wall of the multiple winding tube is formed. On the other hand, the other end of the metal strip 1 is The semi-circular shape is gradually formed from one forming roll 3-1, and the state is maintained.
[0016]
No. The formed body that has exited the 5 forming rolls 3-5 is formed into a double-wound tube shape by the drawing die 4 with a tapered hole for double-winding tube forming in the next second step. That is, as described above, the double-pipe-forming tapered die 4 with a tapered hole is provided with a through-hole 4-1 having a substantially circular cross section with a taper that decreases the diameter from the entry side to the exit side. Since it has a structure, the other end of the single-wound tube 11 is gradually reduced in diameter by passing the molded body through this die, and is formed into a double wall. Is formed into a tube 12-1.
[0017]
In this way, the tube 12-1 formed into a substantially complete double-wall tube shape has its double-wall portion in close contact with the shaping roll 5 and the cored bar 6 with the swimmer 6-1 in the third step of the final stage. , Shaping and finishing. That is, in the pair of shaping rolls 5, the double wall tube 12-1 is tightened from the inside and outside while being supported by the swimmer 6-1 so that the walls are in close contact with each other and finished in a tight state. 12 The core bar 6 with the swimmer 6-1 is inserted into the pipe when in the open pipe state.
[0018]
The double-wound tube thus formed with the walls in close contact with each other is then heated by a heating furnace, a high-frequency heating device, a resistance heating device, etc., and the brazing material or diffusion provided by plating or the like on the metal strip preferably. By melting or diffusing the material, brazing or diffusion bonding between the walls completes the product double wound tube.
[0019]
The various forming rolls in the first step of the apparatus of the present invention may be appropriately combined depending on the type, size (diameter, wall thickness, etc.), material, etc. of the multiple winding tube to be manufactured. Here, the description has been given by taking the formation of a double-winding tube as an example. However, the present invention is not limited to a double-winding tube, but a triple-winding tube 22 as shown in FIG. Needless to say, the present invention can be similarly applied to the molding of the winding tube 32 and the like.
[0020]
【The invention's effect】
As described above, according to the present invention, the following effects can be obtained.
(1) The manufacturing process is composed of a first process composed of a plurality of stages of forming rolls, a second process composed of a drawing die, and a third process of finishing. Compared to the conventional method in which the hoop material is directly formed into a tubular shape by a multi-stage forming roll and the tube body is reduced in diameter, the forming machine can be greatly reduced in size and the equipment cost can be reduced. .
(2) Since the entire surface of the metal strip is wound from one side of the metal strip and passed through the die so that the entire surface of the metal strip does not contact the inner peripheral surface of the die when forming into multiple windings with a die, The amount of high-grade lubricant used to prevent sticking and friction is reduced, which not only facilitates brazing or diffusion bonding, but also does not apply extra force to the metal strip, and residual fatigue stress And the occurrence of scratches on the metal strip can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an apparatus configuration example of a multi-winding tube manufacturing apparatus according to the present invention.
FIG. 2 is a schematic view showing a cross-sectional shape in each step when a double-rolled tube is formed by the same apparatus, (a) is a cross-sectional view showing a beveled metal strip in the first step of FIG. (B) is No. in the first step. 1 is a cross-sectional view of a forming roll part. 2 is a cross-sectional view of the forming roll part. 3 is a cross-sectional view of the forming roll part. 4 is a cross-sectional view of the forming roll part. 5 is a sectional view of the forming roll part, (g) is a sectional view of the part A in the second step of FIG. 1, (h) is a sectional view of the part B in the second step, and (i) is a sectional view of the second part. It is sectional drawing of a part.
3 is an enlarged vertical side view showing a second step shown in FIG. 1. FIG.
4 is an enlarged longitudinal front view showing a third step shown in FIG. 1. FIG.
FIGS. 5A and 5B illustrate a multi-winding tube that can be manufactured according to the present invention. FIG. 5A is a schematic view showing a triple-winding tube, and FIG. 5B is a schematic view showing a quadruple-winding tube.
[Explanation of symbols]
1 Metal strip 2 Beveling roll 3-1 No. 1 1 Forming roll 3-2 No. 1 2 Forming roll 3-3 No. 3 Forming roll 3-4 No. 3 4 Forming roll 3-5 No. 4 5 Forming Roll 4 Drawing Die with Tapered Hole for Double Winding Tube Forming 5 Double Winding Tube Shaping Roll 6 Core Bar 6-1 Swimmer 11 Single Winding Tube 12 Double Winding Tube 12-1 Double Wall Tube 22 Triple Winding Tube 32 Quadruple winding tube

Claims (2)

In a manufacturing method of a multi-winding tube in which a metal strip is wound and formed into a multi-winding tube and brazed or diffusion-bonded, the metal band with the edge part beveled is formed from a plate shape to one side of the band with a forming roll The other side part is formed into a semicircle while being wound from the part, and the other side part is then formed into a semicircular shape, and then the other side part of the semicircular shape that becomes the outer wall of the single-wound tube formed inside is reduced in diameter by a die. A method for producing a multi-winding tube, characterized in that it is formed into a multi-winding tube shape, the multiple-winding tube is fastened between walls of the multi-winding tube with a roll, and then brazed or diffusion bonded. In a multi-winding tube manufacturing apparatus that forms a multi-winding tube by brazing or diffusion-bonding by winding a metal strip, winding the metal strip with the edge portion beveled from one side of the strip from a plate shape Multiple windings while reducing the diameter of the other side part of the semicircular shape that forms the outer wall of the single-wound tube formed inside and a plurality of forming rolls that are formed into a single-circle shape and the other side part is formed into a semicircular shape. It consists of a die with a tapered hole to be formed into a tube shape and a roll for tightening between the walls of the multiple winding tube, and the single roll forming roll, the die with a taper hole, and the tightening roll between walls are on the same line. An apparatus for forming a multi-winding tube, characterized by being arranged in

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