JPS60184462A - Dip forming method - Google Patents

Abstract

PURPOSE:To enable continuous production of a copper alloy clad wire rod by dipping a core wire which is subjected to surface cleaning by non-machining into a molten copper or copper alloy to stick the molten metal around the core wire and hot rolling the casting rod formed in such a way. CONSTITUTION:A seed wire is passed through a cleaning device 23 and the surface thereof is thus cleaned by non-machining. The resultant core wire 1 is passed into a housing 19a in which an inert gaseous or reducing gaseous atmosphere is maintained. The core wire is then fed into an insertion port 2 for the core wire of a crucible 1. The core wire 11 is dipped into a molten copper or copper alloy 5, by which a casting rod 12 stuck and solidified with the molten metal 5 around the core wire 11 is obtd. Such rod is rolled by each one set of oval caliber rolls 16A and round caliber rolls 16B. The reduction ratio by rolling is kept at <=40% to prevent the thickness deviation of the copper alloy layer and the atmosphere in the chamber 15a is made non-oxidative. The continuous production of a copper alloy clad wire rod having good quality is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a so-called dip forming method used in manufacturing clad wire rods of steel or copper alloy.

BACKGROUND OF THE INVENTION Conventionally, a dip forming method has been used as a method for manufacturing copper or copper alloy coated rough drawn wire. An outline of this dip forming method will be explained with reference to FIG. A core wire insertion opening 2 is formed at the bottom of the crucible 1 made of a refractory material such as graphite. Melt W11 is in the crucible 1.
Molten copper 5 is supplied from the molten copper supply port 4 from the molten copper supply port 4 . On the other hand, a seed wire 6 made of copper is drawn by a die 8 while being drawn by a pull block 7. The drawn seed wire 6 passes through a stripping die 10 while being taken off by a capstan 9, and the surface layer is continuously cut off to form a core wire 11 having a clean surface. The core wire 11 is fed upward by pinch rolls 12 and inserted into the crucible 1 through a core wire insertion opening 2 provided at the bottom of the crucible 1. The molten copper 5 solidifies in the core FA11 inserted into the crucible 1, and a cast rod 12 is formed. This casting rod 12 Haruha 1
It is water-cooled to an appropriate temperature in a cooling tower 13 provided above the crucible 1 in connection with the crucible 1, and is fed to a hot rolling apparatus 15 via a guide port 14. In the hot rolling apparatus 15, the cast stock 12 is hot rolled into a plurality of open caliper rolls 16 and a round galvanized roll 16B, and is finished to a predetermined diameter. Thereafter, the wire rod finished to a predetermined diameter is heated in the cooling zone 17, where the temperature is lowered to near room temperature, and in the above process, a product, rough-drawn vA18, is obtained and wound up on a winding device (not shown). .

The inside of the housing 19, which forms a passage for the core wire 11 from the peeling die 6 to the core wire insertion opening 2 of the crucible 1, is provided in a part of the housing 19 as described in, for example, Japanese Patent Publication No. 39-18204. It is evacuated by a vacuum evacuation device (not shown) connected to the exhaust port 20 and maintained in a vacuum atmosphere.

In addition, the passage of the casting rod 12 is connected to a gas supply port 2 provided in the cooling tower 13 in order to create a weakly reducing atmosphere from above the crucible 1 through the cooling tower 13 to the inside of the hot rolling apparatus 15.
1 and a gas supply port 22 provided in the hot rolling apparatus 15, a weakly reducing gas is supplied to the casting rod 1.
2 Surface oxidation is prevented.

According to the conventional dip forming method described above, copper wire is used as a seed wire and molten steel is deposited and solidified to produce a copper rough wire that can be produced industrially. but,
When trying to manufacture a copper-coated steel wire using the steel wire as a seed wire and depositing copper by the above-mentioned dip forming method, the following problem arises, and despite various attempts in the past, it is not practical. was not successful.

The first and biggest obstacle is that when steel wire is used as a seed wire, the lifespan of the stripping die that cleans the surface of the seed wire by cutting becomes extremely short, and operations must be repeated many times to replace the die. It has to be stopped, making it extremely difficult to save money.

Second, in the cast rod obtained by passing through the crucible 1, the interface between the core seed wire and the deposited solidified steel is not metallurgically bonded, and the bond is produced by hot rolling. However, when the seed wire is made of dissimilar metals, it is difficult to finish it to a uniform thickness without uneven thickness by hot rolling. In other words, if the seed wire is made of steel, for example, the strength of the steel wire is different from that of solidified steel and it is difficult to deform uniformly. Therefore, from the casting rod to the finished diameter, it is passed through an oval caliper and then a round chitri bar. If hot rolling is repeated multiple times, the uneven thickness will increase each time.

Purpose of the Invention 4 - This invention has been made in view of the above-mentioned conventional circumstances, and provides a method for stable continuous operation of copper or copper alloy coated crat wire rods for long periods of time, regardless of the material of the core wire. The main purpose is to provide a dip forming method that can be manufactured at low cost.
Furthermore, it is an object of the present invention to provide a dip forming method in which problems due to uneven thickness are less likely to occur even when the materials of the core wire and the material of the covering material are different.

The structure of the invention, that is, the dip forming method of the present invention includes a step of cleaning the surface of a seed wire by non-cutting processing to form a core wire;
The process consists of a process in which a core wire is immersed in copper or copper alloy molten metal, and a copper alloy bath temperature is applied around the core wire to solidify it to obtain a cast rod, and a process in which the cast rod is continuously hot-rolled. This is a characteristic feature. Furthermore, in the tip forming method of the present invention, the hot rolling process is preferably performed once by passing through an oval caliper and then through a round caliper, so that the total rolling degree is 40% or less. It is characterized by making it so that

The dip forming method of the present invention will be explained in more detail below.

FIG. 2 is a schematic diagram showing an example of equipment used to carry out the dip 74-mink method of the present invention. In the figure, the same parts as those in the equipment shown in FIG.

In the equipment shown in FIG. 2, a peeling die is not provided in the housing 19a that forms the passage for the core wire 11 to the core wire insertion port 2 of the crimp 1, and the surface of the seed wire is cleaned by non-cutting in the vicinity of the entrance of the housing 198. A device 23 is provided.

Further, the hot rolling apparatus 15a includes each set of oval caliper rolls 16A and round caliper rolls 16B. Further, a gas supply pipe 24 is provided in the housing 19a, and a gas supply pipe 24 is provided in the housing 19a.
Inside, as shown in Figure 1 above. + The capstan that was provided with the equipment was not installed.

In the dip forming method of the present invention using the above-mentioned equipment, rough drawn copper wire is manufactured in the following manner.

First, the surface of the core seed wire is cleaned by non-cutting processing in the cleaning device 23. As the cleaning method, well-known methods such as wire brushing method, coconut blast method, etc. can be applied. Further, it is also possible to provide a degreasing means for chemically degreasing the surface of the seed wire, if necessary. Since the surface is cleaned by non-cutting processing in this way, this method allows particularly high-strength materials such as copper wire to be used as the seed wire, and stable continuous operation over a long period of time is possible. In addition, since there is no need to provide a cutting means, that is, a peeling die, the seed wire passing through the peeling die must be tensioned from within the housing 19 to cut the seed wire. The advantage arises that there is no need to provide additional drive capstans.

Next, in the present invention, the surface-cleaned core wire is immersed in molten copper or copper alloy, and the molten metal is applied and solidified around the seed wire 7-, which becomes the core. At that time, a housing 19a that forms a passage for the core wire 11 whose surface has been purified
It is preferable to create an inert gas or weakly reducing gas atmosphere inside by using an inert gas or a weakly reducing raw gas supplied from the gas supply perve 24. By doing so, there is an advantage that the housing structure does not need to be extremely air-tied as in the case where the inside of the housing 19a is maintained in a vacuum atmosphere. Moreover, since it is not necessary to make the housing 19a into an air tie 1~, a cleaning device 23 is provided outside the housing 19a, and the cleaning device 23 cleans the ζ core wire of the housing 1C'. The structure that pulls into the la can be easily configured, and f! It becomes easy to take the method of the present invention to clean the wire surface.

Finally, in the present invention, the cast rod whose core wire is poured with molten metal and solidified is subsequently hot rolled in a hot rolling apparatus 15a. The hot rolling mill 15a, which is an example of equipment for carrying out the invention described above, is provided with eight sets of oval caliper rolls 16A and round caliper rolls 16B. Using such equipment, the casting roll is made into an oval caliper roll 16A.
If hot rolling is performed only once, in which the core wire is passed through the round caliper roll 16B, the uneven thickness of the copper or copper alloy solidified on the core wire can be prevented from increasing during the hot rolling process. be able to. In addition, the total rolling degree of the rolling degree of the oval caliper roll 16A and the rolling degree of the round caliper roll 16B during such hot rolling should be 40% or less. desirable. If it exceeds 40%, the uneven thickness of the copper or copper alloy solidified on the core wire will increase, which is not preferable.

Example Next, examples of this invention will be described.

A copper-coated steel wire was manufactured by the method of the present invention using the equipment shown in FIG. 2 described above. A mild steel wire of 9.5 m1aφ was used as the seed wire, and wire brushing was continuously performed in a cleaning device 23 to remove an oxide film and rust on the surface of the mild steel wire. The core wire from which the oxide film and rust had been removed was immediately sent into the housing 19a in a weakly reducing gas atmosphere, and inserted into the crucible 1 from the housing 19a, where pure copper was deposited and solidified. The feeding speed of the seed wire at that time is 70i
/ It was chewy. In addition, the diameter of the obtained casting lot was 131
! It was lΦ. The cast rod was hot-rolled through a cooling tower 13, fed to a hot-rolling device 15, and hot-rolled while preventing oxidation to finish it into 111IIflφ. Therefore, the total degree of processing is about 13%. The copper thickness of the obtained copper-coated steel wire was measured, and the weight ratio was calculated.

The maximum copper thickness is 1.501um and the minimum is 1.4
5u+, with an average length of 1.4811 m. The results show that the material is rolled to a uniform thickness. Further, the weight ratio of copper was approximately 50%, but this value can be varied by changing the speed of the seed wire.

In addition, in this invention, the core wire is not limited to a steel wire as in the above embodiments, but a copper wire or other material may be used as the core wire.

11- It is a schematic diagram showing an example.

Effects of the Invention As described above, according to the dip forming method of the present invention, the surface of the seed wire is cleaned to form a core wire without cutting, and the core wire is coated with molten copper or copper alloy @ solidified. By hot rolling, it is possible to economically manufacture copper or copper alloy coated clad wire rods using high strength materials such as steel wires as seed wires by continuous operation over a long period of time. In addition, the hot rolling process is carried out using a hot rolling machine consisting of one set of oval caliper rolls and one set of round caliper rolls, and hot rolling is performed once through the oval caliper and then through the round caliper. The total rolling degree is 40%.
By doing as follows, it is possible to prevent the metal that has solidified and adhered to the core wire from becoming excessively uneven in thickness during the rolling process.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing equipment for performing the conventional dip forming method, and FIG. 2 is a schematic diagram showing equipment used for implementing the dip forming method of the present invention. Copper, 6...seed line,
10... Peeling die, 11... Core wire, 12.
...Casting rod, 15a...Hot rolling equipment, 16
A... Oval caliper roll, 16B... Round caliper roll, 19a... Housing, 2
3... Cleaning equipment @. Applicant H-Kura Nsen Co., Ltd. Agent Patent attorney Toyoda Sankaku (and 1 other person)

Claims (5)

[Claims] (1) The process of surface cleaning the seed wire by non-cutting to make it into a core wire, and immersing the core wire in molten copper or copper alloy.
A dip forming method comprising the steps of: obtaining a cast rod by adhering and solidifying the molten metal around a core wire; and continuously hot rolling the cast rod. (2) In the hot rolling process, hot rolling is performed by passing through an oval caliper and then passing through a round caliper.
The dip forming method according to claim 1, wherein the dip forming process is carried out so that the total number of rolling marks is 40% or less. (3) The seed wire passageway before the surface-cleaned ridgeline is immersed in the molten copper or copper alloy is placed in an inert gas or weakly reducing gas atmosphere. Dip forming method according to claim 2. (4) The dip forming method according to claim 1, claim 2, or claim 3, wherein the means for surface cleaning of the seed line is a wire brushing method. . (5) The dip forming method according to claim 1, claim 2, or claim 3, wherein the means for cleaning the surface of the seed wire is a shot blasting method.