JPH1046255A - Refined copper pipe excellent in cleanliness in inner surface or production of refined copper alloy pipe and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a producing method of a refined copper pipe, etc., which can sufficiently clean the inner surface in the copper pipe, etc., having small diameter and long total pipe length, and a device therefor. SOLUTION: The hardened copper pipe 13 payed out with a hardened coiling copper pipe delivery device 11 is fed to an induction heater 17 through a straightener 15 and annealed, and the annealed copper pipe is refined with a refining device 21. On the other hand, N2 gas stored in a gas tank 31 for high pressure is press-fed into the refined copper pipe 23 from the end part thereof through a gas pipe 33, and gasified oil content is discharged from the other end. One series work of the delivery-annealing-refining of the hardened copper pipe can continuously be executed while removing the residual oil in the pipe by the above mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing residual oil from the inside of a tempered copper tube or a tempered copper alloy tube, which removes oil adhering to the inner surface of the copper tube or the copper alloy tube together with annealing.

[0002]

2. Description of the Related Art With respect to a method of removing oil remaining on the inner surface of a soft copper tube LWC, a roller hearth furnace or a batch furnace is used to raise the temperature to a temperature higher than a temperature at which oil adhering to the inner surface of the tube is vaporized during LWC annealing. A method has been already established in which an inert gas is fed from one end of the coil tube while vaporized oil is discharged from the other end. (JP-A-6-256855,
JP-A-6-228649)

[0003] Therefore, a tempered copper pipe (for example, a semi-hard copper pipe) with a reduced amount of residual oil on the inner surface is manufactured by feeding out a soft LWC purged in the pipe, and then evacuating the pipe with a die for giving an appropriate reduction. It can be carried out. However, in the case of a small-diameter product having an outer diameter of about 4 to 5 mm, the pipe length reaches several thousand meters or more, and the pressure loss in the pipe becomes excessive. Therefore, it takes a long time to completely remove vaporized oil in the pipe. Is required. For this reason, in the case of a continuous furnace such as a roller hearth furnace, the introduction of LWC has to be intermittent in order to secure a purge time, which has led to a large decrease in productivity.

[0004] Further, it is possible to reduce the residual oil amount of a tempered copper pipe having a proof strength of about 6 to 10 kgf / mm ^{2 by} a similar process of “LWC annealing (purge in the pipe) → annealing coil feeding → proof strength tempering processing”. However, in addition to the multiple steps, the speed of feeding out the soft LWC cannot be increased in order to prevent deformation of the tube, which causes a reduction in efficiency. Further, according to the above-mentioned prior art, there is also a problem that the inside of a tube having a short total tube length is cleaned, but the inside of a small tube having a long total tube length is not sufficiently cleaned.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to sufficiently clean the inside of a tempered copper pipe or a tempered copper alloy pipe having a small diameter and a long total pipe length. To provide a method and an apparatus for producing a tempered copper pipe or a tempered copper alloy pipe, which can perform the heat treatment. Another object of the present invention is to continuously improve the prior art, which is inefficient and requires a large number of man-hours in removing oil adhering to the inner surface of a copper tube or a copper alloy tube together with annealing. An object of the present invention is to provide a method and an apparatus for producing a tempered copper pipe or a tempered copper alloy pipe capable of performing annealing, removing residual oil from the inner surface of the pipe, and performing tempering.

[0006]

In order to solve the above-mentioned problems, in the present invention, the hard coiled copper pipe or the entire hard coiled copper alloy pipe is annealed as it is, and is gas-fed to leave the inner surface of the pipe. Instead of removing the oil, feed the hard coiled copper pipe or hard coiled copper alloy pipe in a state where the gas pressure is fed to the copper pipe or copper alloy pipe, and send the fed hard copper pipe or hard copper alloy pipe. By performing annealing while tempering the annealed pipe, a series of operations of feeding out the hard pipe, annealing, tempering, and winding the tempered pipe are performed in a continuous line. In the present invention, the removal of residual oil from the inner surface of the copper tube or the copper alloy tube is performed sequentially with the movement of the copper tube or the copper alloy tube in the annealing step.

More specifically, in the method for producing a tempered copper tube or a tempered copper alloy tube having excellent internal cleanliness according to the first invention of the present application, a coiled copper tube or a copper alloy tube is fed out. , After continuously heat-treating the fed copper tube or copper alloy tube, when tempering, pumping gas into the copper tube or copper alloy tube during heat treatment, and hard coiled copper tube or hard A method for producing a tempered coiled copper tube or a tempered coiled copper alloy tube through a step of annealing the coiled copper alloy tube, wherein the hard coiled copper tube or the hard coiled copper alloy tube is fed out, and After annealing the fed out hard copper tube or hard copper alloy tube and tempering the annealed copper tube or copper alloy tube to obtain a desired tempered copper tube or tempered copper alloy tube Take this up By obtaining a desired tempered coiled copper tube or tempered coiled copper alloy tube in a state where gas is pumped into the inside of the tube from one end of the copper tube or copper alloy tube, the copper tube is obtained. Alternatively, a desired soft coiled copper tube or a soft coiled copper alloy tube is obtained while removing oil adhering to the inner surface of the copper alloy tube.

[0008] The apparatus for producing a tempered copper pipe or a tempered copper alloy pipe having excellent internal cleanliness according to the second invention is an apparatus suitable for realizing the method according to the first invention. Pipe or copper alloy pipe feeder, apparatus for continuously heat-treating the fed copper pipe or copper alloy pipe, apparatus for tempering the heat-treated copper pipe or copper alloy pipe, and copper pipe or copper from the pipe end A device for pumping gas into the inside of the alloy tube is provided, and a feeding device for feeding the hard coiled copper tube or the hard coiled copper alloy tube, and annealing the hard copper tube or the hard copper alloy tube fed from the feeding device. Annealing apparatus, a tempering apparatus for tempering a copper pipe or a copper alloy pipe annealed by the annealing apparatus into a desired tempered copper pipe or a tempered copper alloy pipe, and tempering by the tempering processing apparatus. Copper tube or copper alloy And a tempering processed tube storage device for forming a desired tempered coiled copper tube or a tempered coiled copper alloy tube by winding the same, the hard coiled copper tube or the hard coiled copper alloy tube or the tempered coil Gas injection device for pumping gas into the inside of the copper tube or the tempered coiled copper alloy tube from one end thereof, and continuously annealing the gas while pushing the gas into the inside of the tube from one end of the copper tube or the copper alloy tube. By doing so, the oil attached to the inner surface of the copper tube or the copper alloy tube is removed together with the continuous annealing.

Referring to FIG. 1, a method for manufacturing a tempered copper pipe or a tempered copper alloy pipe according to the present invention will be described in comparison with a conventional method. Since the coiled soft tube was fed out and tempered, and finally wound up, a tempered coiled copper tube or the like was obtained. The feeding speed cannot be so high, and as shown in the figure, interruption may occur in the process of shifting from annealing to feeding.

On the other hand, in the method for producing a tempered copper pipe or a tempered copper alloy pipe according to the present invention, the pipe feeding step, which is a rate-determining step in a series of steps, is positioned before the annealing step. The operation can be performed continuously without interruption of the operation. In addition, the removal of residual oil on the inner surface of the pipe by gas pumping has conventionally been performed only in the annealing step, but in the present invention, gas pumping is performed in all steps.

FIG. 2 is a block diagram of an apparatus for producing the method for producing a tempered copper pipe or a tempered copper alloy pipe according to the present invention as described above. According to FIG. 2, it is clear that, unlike the conventional method, in the present invention, gas pressure feeding is performed in all steps, and annealing is performed on a part of the drawn out hard copper pipe or hard copper alloy pipe. As described above, in the method and the apparatus according to the present invention, of the entire process in which gas pressure feeding is performed, the residual oil on the inner surface of the pipe is removed in a portion that is being subjected to an annealing process, and the portion includes a pipe. Will move sequentially with the movement of. Therefore, according to the method and apparatus for manufacturing a tempered copper pipe or a tempered copper alloy pipe according to the present invention, a series of operations of feeding out a hard pipe, annealing, tempering, and winding up a tempered pipe are performed on the inner surface of the pipe. It can be performed continuously while removing oil.

As the gas used in the present invention, various gases such as an oxidizing gas and a non-oxidizing gas can be used as long as the residual oil evaporated inside the pipe can be removed.
It is preferable to use a non-oxidizing gas from the viewpoint of preventing oxidation. D
Although a reducing gas such as X gas can be used, it is more preferable to use an inert gas such as a nitrogen gas or an argon gas in consideration of handling and cost. Residual oil inside the pipe or copper alloy pipe can be removed without discoloring or altering the pipe. Further, in FIG. 2, the inert gas is fed from the soft coiled tube to the hard coiled tube, but the direction may be reversed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 is a view showing an embodiment of a tempered copper pipe manufacturing apparatus according to the present invention. As shown in FIG. 3, in the apparatus for manufacturing a tempered copper pipe according to the present invention, the hard copper pipe 13 fed by the coiled hard copper pipe feeding device 11 is straightened by the straightening machine 15 to be annealed. Sent to the line. In this embodiment, the straightening machine 15 is a general one having a grooved roll. The annealing line consists of a heating zone, a holding zone, and a cooling zone. The hard copper tube 13 that has passed through the straightener 15 is first sent to an induction heater 17 and instantaneously high-frequency induction-heated to 400 to 1000 ° C. After recrystallization, it is instantaneously water-cooled in the cooling zone.

The copper tube which has been annealed by the induction heater 17 and has become the soft copper tube 19 is subjected to a tempering process by a tempering device 21 and is given appropriate mechanical properties and dimensions. The tempered copper tube 23 obtained by this temper processing device 21 is:
It is carried to a coiler roll 27 via a temper processing material take-off mechanism 25 composed of a belt feeder, a drum drawing machine, and the like.
Here, an appropriate bending is given, and it is stored in the basket-shaped storage device 29. The storage device 29 has a mechanism for winding the tempered copper tube 23 by rotation, and the tempered copper tube 23 is wound up here, whereby the tempered coiled copper tube 30 is wound.
Is obtained.

In the above embodiment, N ₂ gas is used as the inert gas. Then, the N ₂ gas stored in the high-pressure gas tank 31 passes through the gas pipe 33 and is fed under pressure from the end of the tempered copper pipe 23. The connection between the gas pipe 33 and the end of the tempered copper pipe 23 is made by a rotary seal 35. The rotary seal 35
It has a mechanism that can be synchronized with the rotation of the container 29, and the connection between the pipe after the rotary seal 35 and the end of the tempered copper pipe 23 is performed by a pipe coupler 37. Since the pipe coupler 37 has sufficient pressure resistance, the gas pipe 3
The airtightness of the connection between 3 and the tempered copper tube 23 is maintained.

The gas pipe 33 has a pressure adjusting valve 39 for adjusting the N ₂ gas supplied from the high-pressure gas tank 31 to a predetermined pressure required for purging the inner surface of the copper pipe, and an electromagnetic valve 41 which opens and closes when the line is started. It is provided. At the same time, a flow meter 43 and a pressure sensor 45 are attached to the gas pipe 33 so that the state of the gas pipe 33 is monitored. Data of the flow rate and pressure of the purge gas obtained from the flow meter 43 and the pressure sensor 45 are recorded by a recorder 47.
Output from In this embodiment, the supply of the high-pressure N ₂ gas is performed from the end of the tempered copper tube 23, but the supply of the high-pressure N ₂ gas is performed from the end of the hard copper tube 13. The same effect as described above can be obtained. This is because, regardless of which end of the hard copper tube 13 or the tempered copper tube 23 is supplied with the N ₂ gas, the vaporized oil is discharged from the other end.
Further, although this embodiment shows a case of a copper tube, it is apparent that the present invention is not limited to a soft tube and can be applied to a copper alloy tube.

[0017]

EXAMPLES Table 1 shows the effects when the above embodiment is applied to the site. The gas pipe 33 used had a diameter of about 1 inch.

[0018]

[Table 1]

As shown in Table 1, it is recognized that annealing, tempering, and removal of residual oil on the inner surface can be performed in a continuous line, and productivity is greatly improved. The inner residual oil amount is 0.04 mg / m or less, which is equivalent to that of the prior art. However, the required number of personnel is small and the labor saving effect can be achieved.

[0020]

As described above, according to the present invention,
A series of operations such as feeding of a hard tube, annealing, tempering, and winding of a soft tube can be continuously performed while removing residual oil from the inner surface of the tube.

[Brief description of the drawings]

FIG. 1 is a view for explaining a method for producing a tempered copper pipe or a tempered copper alloy pipe according to the present invention, in comparison with a conventional method.

FIG. 2 is a block diagram of an apparatus for manufacturing a tempered copper pipe or a tempered copper alloy pipe according to the present invention.

FIG. 3 is a view showing an embodiment of the apparatus for manufacturing a tempered copper pipe according to the present invention.

[Explanation of symbols]

 11 Coiled hard copper tube feeding device 13 Hard copper tube 15 Straightening machine 17 Induction heater 19 Soft copper tube 21 Heat treatment device 23 Heat treatment copper tube 25 Heat treatment material take-off mechanism 27 Coiler roll 29 Storage unit 30 Heat treatment coil Copper pipe 31 Gas tank for high pressure 33 Gas pipe 35 Rotary seal 37 Pipe coupler 39 Pressure regulating valve 41 Solenoid valve 43 Flow meter 45 Pressure sensor 47 Recorder

Claims (4)

[Claims] 1. A coiled copper tube or copper alloy tube is fed out, and after feeding out the fed copper tube or copper alloy tube, heat treatment is performed continuously. A method for producing a tempered copper pipe or a tempered copper alloy pipe having excellent internal cleanliness, wherein the pipe is fed into a copper pipe or a copper alloy pipe during heat treatment. 2. A method for producing a tempered coiled copper pipe or a tempered coiled copper alloy pipe through a step of annealing a hard coiled copper pipe or a hard coiled copper alloy pipe, wherein the hard coiled copper pipe or the tempered coiled copper alloy pipe is provided. A pipe or a hard coiled copper alloy pipe is fed, annealed to the drawn hard copper pipe or the hard copper alloy pipe, and tempered the annealed copper pipe or the copper alloy pipe to obtain a desired soft copper pipe. After obtaining a tube or a soft copper alloy tube, a desired tempered coiled copper tube or a tempered coiled copper alloy tube is obtained by winding the tube, and gas is supplied from one end of the copper tube or the copper alloy tube. By performing the process in a state of being pumped into the inside of the pipe, it is possible to obtain a desired tempered coiled copper pipe or a tempered coiled copper alloy pipe while removing oil adhering to the inner surface of the copper pipe or the copper alloy pipe. Feature A method for producing a tempered copper pipe or a tempered copper alloy pipe having excellent inner surface cleanliness. 3. An apparatus for feeding a coiled copper pipe or a copper alloy pipe, an apparatus for continuously heat-treating the fed copper pipe or the copper alloy pipe while feeding, and tempering the heat-treated copper pipe or the copper alloy pipe. An apparatus for producing a tempered copper pipe or copper alloy pipe having excellent internal cleanliness, comprising: an apparatus for processing; and a device for pumping gas into a copper pipe or a copper alloy pipe from a pipe end. 4. A feeding device for feeding a hard coiled copper tube or a hard coiled copper alloy tube, an annealing device for annealing the hard copper tube or the hard copper alloy tube fed from the feeding device, and annealing by the annealing device. Tempering device for tempering the processed copper tube or copper alloy tube into a desired tempered copper tube or tempered copper alloy tube, and winding the copper tube or copper alloy tube tempered by the temper processing device A tempered tube storage device for forming a desired tempered coiled copper tube or tempered coiled copper alloy tube by using the hard coiled copper tube, the hard coiled copper alloy tube, or the tempered coiled copper tube Alternatively, a gas press-in device for pumping gas into the inside of the tempered coiled copper alloy tube from one end thereof is provided, by continuously annealing while gas is fed into the inside of the copper tube or copper alloy tube from one end of the tube. , With continuous annealing An apparatus for producing a tempered copper pipe or a tempered copper alloy pipe having excellent internal cleanliness, wherein both remove oil adhering to the inner face of the copper pipe or the copper alloy pipe.