JP4107516B2 - Multiple winding metal tube manufacturing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for producing a multi-winding metal tube by winding or diffusing a metal strip, and in particular, a multi-winding metal tube formed into a double-wound tube and brazed or diffusion-bonded, or heat treatment. It is related with the cooling device which cools elongate materials, such as a single wound tube body, a seamless tube body, and a rod after being given.
[0002]
[Prior art]
Conventionally, as a multi-winding metal tube manufacturing apparatus, a metal strip having a copper brazing material applied to the entire surface of one surface is plastically deformed by a molding device and formed into a multi-winding tube body. The brazing material in between is melted by a heating device, and the molten brazing material is dissipated from the multi-winding metal tube by a cooling device to be solidified and brazed.
[0003]
As an example of the cooling device in this case, as shown in FIG. 5, the housing 11 surrounding the multi-winding metal tube 5 has a double structure, and the cooling water 17 is passed through the outer housing to enclose the housing 11. The brazing filler metal melted by indirectly cooling the multi-winding metal tube body 5 is solidified inside the casing 11 by the cooling device 10 that cools the outer wall 30.
[0004]
As another example, as shown in FIG. 6, a reducing gas or a neutral gas (inert) 20 is directly introduced into a housing 11 surrounding the casing 11, and the multi-winding metal tube 5 is directly cooled by the gas. the brazing material melted by the housing 11 there is a system cooling device 10 of the coagulating internally.
[0005]
Furthermore, as another example, as shown in FIG. 7, a reducing gas or a neutral gas is directly introduced into a casing 11 surrounding the multi-winding metal tube 5 and the transferred multi-winding metal tube 5 is In addition to direct cooling with gas, a heat exchanger 28 or a chiller unit is provided via the pipes 26 and 27 so that the reducing gas or neutral gas introduced into the housing 11 is re-cooled and circulated to be melted. There is also a cooling device 10 that solidifies the inside of the housing 11 .
Besides, the water-cooled roll 29 having a rotary joint in the housing 11 surrounding the multiwound metal tube 5, as shown in FIG. 8 and more pieces arranged, the water-cooled roll 29 is transferred to the housing 11 A cooling device 10 that employs a cooling roll system in which the outer surface of the multi-winding metal tube body 5 is directly brought into contact with the outside and cooled is also used.
[0006]
[Problems to be solved by the invention]
However, when the indirect cooling unit shown in FIG. 5 is used, the cooling medium is not in direct contact with the outer surface of the multi-winding metal tube body 5, so that the cooling efficiency is poor, and cooling is required to lower the temperature to a predetermined temperature. There is a problem that the production efficiency is low because it is necessary to cool the region for a long time or at a low speed.
[0007]
When the gas direct cooling device shown in FIG. 6 is used, in order to use heat exchange based on the contact between the gas-cooled cooling gas 20 having a small specific heat and the solid multi-wrapped metal tube body 5 having a large specific heat. In order to lower the cooling efficiency to a predetermined temperature, it is inevitable that the cooling area is long and the cooling is performed for a long time, or the cooling time is long because the cooling is performed at a low speed.
[0008]
Furthermore, even when the circulating gas direct cooling device shown in FIG. 7 is used, since the gas flowing into the housing 11 is heat-exchanged outside the housing 11 using the heat exchanger 28 or the chiller unit, Although it shows slightly better cooling efficiency than the former two, it is cooling using a gas with low specific heat, so it is necessary to take a long cooling region in order to lower it to a predetermined temperature. Prolonging time is inevitable.
Furthermore, in the case of using the cooling roll direct contact device shown in FIG. 8, the surface of the water-cooled roll 29 is in direct contact with the outer surface of the heated multi-winding metal tube 5, which is better than the former three. Although the cooling efficiency is high, the surface of the water-cooled roll 29 and the outer surface of the multi-winding metal tube 5 only show partial point contact, and the cooling efficiency is still not satisfactory.
[0009]
As described above, even with various cooling devices conventionally employed, the cooling efficiency cannot be improved to a satisfactory level, and the brazing material flows out of a predetermined location (wasting) from the inner and outer surfaces of the multi-winding metal tube body. Problems such as generation of dirt, formation of cavities between the walls of the metal tube, generation of crystal grains of the base material of the metal tube, and coarsening, leading to deterioration of product yield as well as product yield. The point could not be solved.
[0010]
The present invention solves the above-mentioned problems, manufactures a multi-winding metal tube having a cooling device that has high cooling efficiency, can save space, enables cooling processing in a short time, and at the same time enables high-speed cooling It is an object to provide an apparatus.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a molding device for forming a metal strip into a multi-winding metal tube, a heating device for melting a brazing material applied between the walls of the multi-winding metal tube, A multi-winding metal tube manufacturing apparatus comprising a cooling device for solidifying and cooling the brazing material, wherein the cooling device is sandwiched in contact with an outer surface in the axial direction of the multi-winding metal tube, and the multi-winding metal tube body A pair of endless metal belts that can rotate and move at a speed synchronized with the transfer speed, and an inner surface of each endless metal belt so that the endless metal belt can be pressed against the outer surface in the axial direction of the multi-winding metal tube. A plurality of pressing rolls provided, heat dissipated from the multi-winding metal tube in contact with the outer surface of the metal belt provided outside the endless metal belts through the endless metal belt, D And radiating role to prevent overheating of the dress metal belt is constituted by at least one drive roll for rotating transferring the endless metal belt at a speed synchronized with the transport speed of the multi-winding metal pipe body of the, and The press roll is characterized by a multi-winding metal tube manufacturing apparatus in which grooves are provided on the outer periphery .
[0012]
In the present invention, it is preferable that a plurality of the driving rolls are arranged, and each of the pressing roll and the heat radiation roll includes a rotary joint, and is a water-cooled roll that allows passage of cooling water inside the roll. It is preferable to be configured.
[0013]
In addition, it is preferable that a plurality of endless metal belts are arranged in the circumferential direction and contact the outer surface of the multi-winding metal tube at a plurality of locations in the circumferential direction of the multi-winding metal tube.
On the other hand, it is preferable that the position of at least one rotating shaft core of the heat radiating roll can be controlled following the expansion and contraction of the endless metal belt.
Moreover, it is preferable that a refrigerant injection nozzle that enables a pre-cooling process is provided in the vicinity of the inlet of the multi-winding metal tube inside the casing surrounding the cooling device.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a multi-winding metal tube manufacturing apparatus in which a forming device, a heating device, and a cooling device are sequentially arranged, and brazing a multi-winding metal tube by melting a brazing material between the walls of the multi-winding metal tube. An object of the present invention is to improve a cooling device that cools a multi-winding metal tube that has passed through a heating device for solidification and solidifies and brazes the brazing material melted in the previous step.
Furthermore, the present invention provides a cooling device for sufficiently exerting the above-described function by bringing a metal belt having good heat conduction into contact with the outer peripheral surface of the multi-winding metal tube, so that heat from the multi-winding metal tube can be obtained. The apparatus is a multi-winding metal tube manufacturing apparatus that can perform cooling efficiently by bringing the metal belt itself into contact with a separately provided water-cooled roll while performing transmission quickly.
[0015]
The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic diagram showing the overall configuration of an apparatus according to an embodiment of the present invention, and FIG. FIG. 3 is a schematic diagram showing the configuration of the cooling device section of the apparatus according to the embodiment of the present invention, and FIG. 4 is a schematic diagram showing the configuration of the cooling apparatus of the apparatus according to another embodiment of the present invention.
[0016]
As shown in FIG. 1, the multi-winding metal tube manufacturing apparatus 1 of the present invention continuously multiplies a metal strip 2 unwound from an uncoiler (not shown) in a cylindrical shape by a multi-stage forming roll 3. Multiple-winding metal tube formed into a predetermined shape by a plurality of pairs of energizing rolls 6 (rotating electrodes) arranged at an appropriate interval in the transfer direction of the multi-winding metal tube 5 and a forming device 4 for forming into a winding 5 is a heating device 9 that heats by resistance heating (in the heating device, when the press roll 7 and the pinch roll 8 are used to control the transfer speed of the multi-winding metal tube 5 and press the wall of the multi-winding tube 5 in the radial direction) And a cooling device 10 for solidifying the brazing material melted by the heating device 9 and brazing the multi-winding metal tube body 5.
In this case, the inside of the heating device 9 is a non-oxidizing atmosphere or a reducing atmosphere.
[0017]
In the illustrated embodiment, the roll diameter of the pinch roll 8 is made larger than the roll diameter of the presser roll 7 or the rotational speed of the pinch roll 8 is changed as means for pressing the walls of the multi-winding tube body 5 in the radial direction. By doing so, an apparatus in which a tensile force in the tube axis direction acts on the multi-winding metal tube body 5 between the presser roll 7 and the pinch roll 8 has been shown. However, Japanese Patent Laid-Open Nos. 8-215743 and 8- It can also be replaced with a device for pressing the multi-winding tube body from the outside or the inside as disclosed in Japanese Patent No. 215744.
If comprised in this way, when the brazing material which exists between the walls of the multi-winding metal tube 5 is heated and melted and given fluidity, the walls of the multi-winding metal tube 5 are made to cross each other in the radial direction. It will be pressed.
[0018]
Thus, in order to solidify the brazing material in a molten state, the multi-winding metal tube body 5 is then sent to the cooling device 10. The cooling device 10 is surrounded by a casing 11 so as to enable a reducing gas or neutral gas atmosphere, and is sandwiched in the casing 11 so as to be in contact with the outer surface in the axial direction of the multi-winding metal tube 5. In addition, a plurality of pairs of endless metal belts 12 that can rotate and move at a speed synchronized with the transfer speed of the multi-winding metal tube 5, and the endless metal belts 12 are multiplexed in contact with the inner surfaces of the endless metal belts 12. A plurality of pressing rolls 13 that press against the outer surface in the axial direction of the wound metal tube 5 and the outer surface of the endless metal belt 12 are in contact with the outer surface of the metal belt and transmitted from the multiple wound metal tube 5. The endless metal belt 12 is radiated from the endless metal belt 12 to prevent the endless metal belt 12 from being overheated. It is constituted by a driving roller 15 for rotating the transfer at a speed synchronized with the transport speed of the Shokukantai 5.
[0019]
In this case, the heat applied to the multi-winding metal tube 5 for melting and brazing the brazing material existing between the walls of the multi-winding metal tube is sandwiched so as to come into contact with the multi-winding metal tube 5. The pair of endless metal belts 12 are quickly discharged by the action of the heat radiation roll 14.
[0020]
In this case, it is preferable that a plurality of drive rolls 15 are arranged in the circumferential direction of the multi-winding metal tube body 5, thereby making it easy for the endless metal belt 12 to be in close contact with the outer peripheral surface of the multi-winding metal tube body 5. Smooth running of the endless metal belt 12 is ensured.
[0021]
Moreover, it is preferable that each or any one of the press roll 13 and the heat radiation roll 14 is formed as a water cooling roll which provided the rotary joint and enabled the passage of the cooling water 17 inside the roll (refer FIG. 2) . Thus, the heat of the multi-winding metal tube body 5 is radiated more rapidly through the endless metal belt 12 disposed so as to be in surface contact with each of the pressing roll 13 and the heat radiation roll 14.
Further, the press roll 13 formed as a water-cooled roll is preferably formed as a grooved press roll 13 having grooves 18 provided on the outer periphery as shown in FIG. The area in contact with the tube body 5 is expanded, and the heat of the multi-winding metal tube body 5 can be radiated more quickly.
[0022]
In addition, as shown in FIG. 2, a plurality of endless metal belts 12 are provided in the circumferential direction, and arranged so as to contact the outer surface of the multi-winding metal tube 5 at a plurality of locations in the circumferential direction of the multi-winding metal tube 5. As a result, the area where the endless metal belt 12 contacts the multi-winding metal tube body 5 is enlarged, and the heat of the multi-winding metal tube body 5 can be radiated more quickly.
[0023]
On the other hand, as shown in FIG. 3, it is preferable that at least one rotating shaft core 19 of the heat radiating roll 14 is disposed so as to be position-controllable following the expansion and contraction of the endless metal belt 12 by heat. As a result, the tension of the endless metal belt 12 is controlled as the endless metal belt 12 expands and contracts due to the heat transmitted from the multi-winding metal tube 5, and the degree of engagement between the endless metal belt 12 and the drive roll 15 is controlled. The operation of the endless metal belt 12 is ensured in synchronization with the transfer speed of the multi-winding metal tube 5, and the frictional wrinkles on the outer peripheral surface of the multi-winding metal tube 5 are generated by the surface sliding action of the endless metal belt 12. Is prevented.
[0024]
Further, as shown in FIG. 4, a refrigerant injection nozzle 22 that enables precooling processing is provided in the vicinity of the inlet 21 of the multi-winding metal tube 5 in the housing 11 that surrounds the cooling device 10. Preferably, even when the multi-winding metal tube 5 is transferred to the cooling device 10 while the brazing material is in a molten state, the multi-winding metal tube 5 is pressed by the pressing roll 13 disposed in the cooling device 10. The cross-sectional shape of the multi-winding metal tube body 5 is fluctuated, the outer peripheral surface of the multi-winding metal tube 5 is scratched, or the brazing material can be sufficiently prevented from protruding to a predetermined outside region, and the heat dissipation efficiency is improved, and the cooling device The length of 10 can be shortened or the multi-winding metal tube 5 can be sent at high speed, and the apparatus can be downsized and succeeded.
In addition, as a heating device of the multi-winding metal tube manufacturing device according to the present invention, a heating device using a high-frequency heating coil, or a general heating furnace known from Japanese Patent Publication No. 29-4613 can be used as the heating device. .
[0025]
【The invention's effect】
As described above, according to the present invention, the miniaturization and efficiency improvement of the cooling device is promoted, so that the multi-winding metal tube manufacturing device itself is miniaturized, the heat dissipation efficiency is improved, and the friction on the outer surface of the product is increased. Occurrence of soot is prevented, and efficient productivity can be sufficiently secured.
In addition, no voids indicating poor brazing between the walls of the multi-winding metal tube are recognized, and a thin brazing layer with good adhesion is recognized.
Furthermore, no contamination due to the outflow of brazing material was observed on any of the inner and outer surfaces of the multi-winding metal tube, and the seam portion formed on the outer surface of the multi-winding metal tube was finished almost smooth and high quality. Can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the overall configuration of an apparatus according to an embodiment of the present invention.
FIG. 2 is a partial cross-sectional view showing a main part of the cooling device of the present invention.
FIG. 3 is a schematic view showing the configuration of an embodiment of the cooling device of the present invention.
FIG. 4 is a schematic view showing the configuration of another embodiment of the cooling device of the present invention.
FIG. 5 is a schematic view showing a configuration of a cooling device according to a conventional example.
FIG. 6 is a schematic view showing a configuration of another cooling device according to a conventional example.
FIG. 7 is a schematic diagram showing the configuration of another cooling device according to a conventional example.
FIG. 8 is a schematic view showing the configuration of another cooling device according to a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multiple winding metal pipe manufacturing apparatus 2 Metal strip 3 Forming roll 4 Forming apparatus 5 Multiple winding metal tube 6 Current supply roll 7 Pressing roll 8 Pinch roll 9 Heating device 10 Cooling device 11 Case 12 Endless metal belt 13 Pressing roll 14 Heat radiation Roll 15 Drive roll 17 Cooling water 18 Groove 19 Rotating shaft core 20 Cooling gas 21 Inlet 22 Refrigerant injection nozzle

Claims (3)

A molding device for forming a metal strip into a multi-winding metal tube, a heating device for melting a brazing material applied between the walls of the multi-winding metal tube, and a cooling device for solidifying and cooling the melted brazing material In the multi-winding metal tube manufacturing apparatus, the cooling device is held so as to be in contact with the outer surface in the axial direction of the multi-winding metal tube, and can be rotated at a speed synchronized with the transfer speed of the multi-winding metal tube. A pair of endless metal belts, a plurality of pressing rolls disposed in contact with the inner surface of each endless metal belt so as to press the endless metal belt against the outer surface in the axial direction of the multi-winding metal tube, Heat which is provided outside the endless metal belt and is in contact with the outer surface of the metal belt and transmitted from the multi-winding metal tube is radiated through the endless metal belt, thereby preventing the endless metal belt from overheating. A radiator roll of fit, the is constituted by at least one drive roll for the endless metal belt is rotatably transported in a synchronized speed the transfer speed of the multi-winding metal pipe body of the and the pressing roll groove in the outer periphery An apparatus for producing a multi-winding metal tube, which is provided .   2. The multi-winding metal tube production according to claim 1, wherein at least one of the pressing roll and the heat radiation roll includes a rotary joint, and is configured as a water-cooled roll that allows passage of cooling water inside the roll. apparatus. The endless metal belt with a plurality circumferentially disposed, according to claim 1 or 2, characterized in that contact with the outer surface of said multiplexing wound metal pipe body at a plurality of positions in the circumferential direction of the multi-winding metal pipe body The multi-winding metal tube manufacturing device described

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