JPS58179551A - Production of copper wire - Google Patents

Abstract

PURPOSE:To prevent the disconnection during drawing and to produce a copper wire having good drawability, by segmenting a tundish to a receiving part and a tapping by means of a porous gate, removing the foreign matter in molten copper and killing the flow from the tapping part. CONSTITUTION:A tundish 1 which supplies molten metal into a casting device for producing a copper wire is constituted of a receiving part 2 which receives molten metal from a trough 5 and a tapping part 3 provided with a tap hole 6. Both parts are segmented by means of a porous gate 4 consisting of ceramics. Said gate 4 is preferably of 0.5-3mm. average hole size and 50-90% voids, and is provided with the relation 200/alpha<=T<=700/alpha wherein the thickness thereof; Tcm and void content alpha%, so that the effect of removing foreign matter and killing the flow of the molten copper is provided without causing clogging in a short time and the substantial strength is obtained. The material to be used for said gate is preferably cordierite or the like having good heat resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a copper wire with good wire drawability, and in particular to a method for processing molten metal to obtain a copper wire that is less likely to break during wire drawing. be.

In recent years, with the development of the electronic industry, devices have become smaller and smaller, and the winding wires and wiring wires used are also becoming thinner. On the other hand, from the point of view of wire drawing efficiency, it has become even more desirable to increase the wire drawing speed and to reduce the occurrence of wire breakage during wire drawing even under such conditions.

The present invention was made in order to obtain a copper wire that can be molded as described above, and for casting, the molten metal is poured into a special tamp.

By processing with ish, the drawability is greatly improved and copper wire is produced with less breakage during wire drawing.
The aim is to provide a method for doing so.

The dud 114 is a production of copper wire characterized by casting using a tundish consisting of a receiving part for receiving molten metal and a tapping part for dispensing the molten metal, and the drawing part is separated by a porous weir made of ceramic. It's a method.

The copper wire manufactured by the non-explosion 1 method is a wire made of pure copper or copper alloy, such as tough pitch copper, oxygen-free copper, deoxidized copper, etc.

In the present invention, the casting method may be continuous casting (eg, foil and belt method, twin belt method, etc.), round copper casting, or other casting methods.

In addition, the tongue tissue is a tundish part that has an outlet for supplying ρψ to the casting machine at a desired flow rate, and is generally used to finely adjust the amount of poured molten metal, such as in continuous casting. It will be installed. For example, even if the shape has fMJ1+ at the bottom as shown in Fig. 1 (including the one with holding 12), the molten metal may be slightly acidic in front of the casting machine as shown in Fig. 3, and the slope It may be possible to continuously control the amount and pour the molten metal into the casting machine at a desired flow rate (seven troughs for pouring the molten metal).

Hereinafter, the present invention will be explained by examples using the drawings.

FIG. 1 is a longitudinal sectional view showing an example of a tundish used in an embodiment of the method of the present invention. In the figure, a comb tissue 1 consists of a receiving part 2 for receiving molten metal and a tapping part 3 for tapping the molten metal, and a porous weir 4 made of ceramic ivy separates them.

5 is a trough, and there are 6 spouts.

Next, FIGS. 3 to 5 are diagrams for explaining the case where the tundish is a pouring amount trough. In the figure, the same reference numerals as in FIG. 1 indicate the same parts.

FIG. 3 is a side view showing a state in which molten metal is poured into a twin-belt continuous casting machine. In the figure, C is a twin-belt continuous casting machine, with a pair of upper and lower metal belts 9,
9 and a pair of left and right side dams 1o connecting copper alloy block groups, from the pouring trough 11 to the casting speed Lr; As a result, turbulent flow is controlled to prevent entrainment and the like. However, conventionally, when adjusting the slope of the trough 11, the 21 field line was kept constant even due to the undulation of the scene inside the trough or the falling flow from the transport path (gutter) to the trough 11, and the mold part The turbulence of '1. It was easy. For this reason, one of the conventional plans is to
A pouring trough 41 having the structure as shown in the figure is used, and a barrier 42 is provided in the middle to weaken the influence of the falling flow when receiving the hot water, and at the same time to prevent slag from getting mixed in when pouring the hot metal. Prevention 11 - "My husband also carried out this process. However, a complete solution to the above-mentioned casting problem was not obtained, and slag sometimes got caught up in the pouring flow and got mixed into the casting area. .

FIGS. 5(A) and 5(B) are longitudinal sectional views showing a tongue tissue (molten metal pouring amount trough) used in an embodiment of the method of the present invention. (a) The one shown in the figure is the pouring trough 21
A porous weir 24 made of ceramic is arranged near the center of the trough 31. In the case shown in Fig.
5 and 022, which is equipped with a similar porous weir 34.
23 is a hot water receiving part, and 23 is a hot water outlet part. Porous weir 24, 84
, the porous barrier 35 has a porosity of 75% and an average particle size of 2, for example.
It is made of a porous material with a diameter of 80 mm and r#.

These porous materials reduce the generation of waves on the molten metal surface due to the inclination of the troughs 21 and 31, and also calm down the falling flow when receiving the molten metal, allowing stable molten metal to be poured into the mold from the pouring port 26. Fluctuations in the liquid level in the unsolidified area were small, and turbulence in this area was also reduced. Furthermore, the porous material had the effect of trapping slag mixed in from upstream, reducing entrainment of slag.

In the present invention, the porous weir made of ceramic is made of a porous material (e.g., three-dimensional network skeleton structure, etc.) or an aggregate of ceramic particles (e.g., sintered body, packed rod, etc.) 75. It is like a partition wall, and its material is a compound with good heat resistance, such as Al2O3, MgO, SiO, etc.

TiO2, ZrO2, P, 05, CaO, Si
3N4. Out of SiC etc.

It consists of one or more substances selected from
It has strength at the temperature of molten copper (generally around 1100 to 1200 degrees Celsius), and is resistant to damage due to repeated thermal shock during use.
Pl and σ1 are suitably selected in consideration of manufacturing problems such as processability into a porous body of 11 to 1.

In consideration of these problems, copierite is recommended industrially.

Here, corchiilite has a theoretical composition of 2Mg02Ae.
It is a ceramic represented by 2045SiO2, but M
gO, AI! The eating ratio of 203.5i02 is approximately Mg0
2-14%, A e20.25-39%, 5i0
The content may be within the range of 251% to 65%, and there is no problem with the inclusion of some 1t oxide, etc., which may be added intentionally or unintentionally.

I will further explain why coachilite is recommended here] For example, materials such as quartz glass are strong against thermal shock, but they are not strong in the temperature range of molten steel, and alumina and spinel are weak against thermal shock. A part of the porous body is easily damaged.

Also, materials such as graphite, which are consumed in an oxidizing atmosphere, are difficult to put into practical use. Considering the temperature and atmosphere during use, the function of the porous weir, and the strength of "Ajf"i,
The present inventors have found that coachillite is optimal for molten steel.

FIG. 2 is a diagram schematically showing the structure of a porous body, where 7 is a ceramic particle and 8 is a pore between the particles.

Next, in the present invention, a mechanism in which molten metal is processed in a container will be explained.

Molten metal from a holding furnace, melting furnace, etc. flows into the receiving part of the tongue tissue through a trough, etc., but generally, such an inflow part creates turbulent flow, and there are gases and floating particles on the surface. It is easy to entrain oxides, etc. The tapping section is a part that supplies molten metal to the mold in a desired flow through a nozzle or a trough. By separating the receiving part and the tapping part with a porous weir made of ceramic as in the present invention, the molten metal to be cast passes through this porous weir, and during this time the molten metal in the receiving part is closed. In addition to removing foreign substances such as oxides contained in the copper, other refractories, and iron powder, the turbulent flow in the receiving section becomes a static flow in the tapping section, and gases and remaining foreign substances are removed from the ingot during casting. Prevent rain from getting mixed in as much as possible.

In the present invention, if the average pore diameter of the porous weir made of ceramic is less than 0.5 mm, the porous weir will become clogged with oxides etc. in a short time, and if it exceeds 3 fl, it will be difficult to remove foreign matter etc. Since we have obtained empirical knowledge that the effect is not sufficient, 0.5 to 3 fl is preferable.

If the porosity of this porous weir is less than 50%, the heat generated by the porous weir tends to increase, and the apparent heat transfer also increases, so be careful especially when the porous weir is used up. - 50 to 90% is preferable because it tends to cause clogging, and if it exceeds 90%, ceramics are generally brittle and there is a risk that a part of the porous body may break due to the flow of molten copper.

Next, the thickness of the porous weir through which the molten copper passes is Tc+
++) C-1, it is necessary not only to have the strength as a weir, but also to exhibit the effect of making the molten copper flow static and the effect of filtering foreign matter, and to have a low occurrence of 11 clogging, +
The relationship between the light 1llI/'l ratio and the porosity (α%) of the porous body - If the C1 thickness is less than 200/α, there will be no filtration effect or static flow, and the thickness will be 700%. We found that if the value exceeds /α, 1-1 1-1 is generated unnecessarily, and the price becomes prohibitive, and there is little further improvement of the double effect. That is, it is desirable that the relationship between the thickness (Tcm) of the porous weir and the porosity (α%) is 200/α≦T≦700/α.

Example: Ordinary electrolytic copper was continuously melted in a shaft furnace, and molten tough pitch copper with an oxygen content of approximately 250 to 800 ppm was supplied to the receiving part 2 of the tundish 1 as shown in FIG. The melt is passed through the porous weir 4 and sent to the tapping section 3, from which it is continuously cast in a foil-and-belt type continuous casting machine through the tapping port 6 (nozzle), and immediately the molten metal of the present invention having a diameter of 8 mm is cast. Manufactured Arahiki line. Here, the ceramic porous bodies shown in Table 1 were used for the porous weir 4.

In addition, porous weirs made of ceramics whose average porosity, average pore diameter, and weir thickness are within the above-mentioned recommended ranges are used in the present invention, and those where at least one of them is outside the range are classified as unexploded 8A (2 ).

For comparison, a conventional rough wire was manufactured using a conventional tundish without a porous weir.

The wire drawability (drawing weight per wire breakage) was measured when the rough drawn wire was drawn to 26mmφ and then further drawn to 0.18mmφ and 0.05flφ using a continuous wire drawing machine. d'do1 was moe.

The conditions during the manufacturing process and the wire drawability are as shown in Table 2.゛Table 1 rl) * indicates items outside the recommended range.

Table 2 From Table 2, it depends on IK! It can be seen that samples No. 1 to No. 11 have less occurrence of wire breakage and improved wire drawability compared to the conventional example.

In addition, Al-45 whose porosity, average pore diameter, and weir thickness of the porous layer are within the recommended ranges allows for stable casting without causing 1-1 clogging or chipping of the porous layer. The operation was successful, but at least one of these was outside the recommended range, meaning that it was easy for the porous material to break off once per shake, and sufficient samples for evaluation were not obtained. CJFL7), the still young fruit is not 1. perspiration, or there is not enough water 7), 8. *: 9)
Therefore, the effect of improving wire drawability was also lower than those within the range.

As described above, the copper wire manufacturing method of the present invention has a receiving part for receiving k-chip and a tapping part for tapping molten metal.
(k) Since the image parts are separated by a porous layer made of ceramic and are cast using a tan tissue, the molten metal to be cast passes through the porous layer, and the molten metal receives the molten metal during this period. In addition to removing the molten steel contained in the molten steel and foreign substances from objects and materials, the disturbance of L, A +'+l-,
The oil flow is static in the tapping area, which prevents gas and residual foreign matter from entering the ingot during casting, resulting in less wire breakage during copper wire drawing and greatly improved wire drawability. In particular, it has the effect of improving the productivity of thin copper wire.

[Brief explanation of the drawing]

Figure 1 shows misfire I'! FIG. 1.1 is a longitudinal cross-sectional view showing an example of a tongue tissue used in an example of the method. FIG. 2 is a diagram schematically showing the structure of the porous body of the porous layer shown in FIG. 1. FIG. 3 is a side view showing a state in which molten metal is poured into a twin-belt continuous casting machine. FIG. 4 is a longitudinal sectional view showing an example of a conventional pouring trough. FIGS. 5A and 5B are longitudinal cross-sectional views showing tundishes used in other embodiments of the unexploded FJ1 method. l...Tan tissue, 2.22...1M part, 312
3...1+1/M part, 4, 24.34-porous layer, 5
Trough, 6. Outlet, 7. Ceramic particles, 8.
... Hole, 9... Metal belt, 10... Side gum, 11.21.8+, old? 1g? Trough for M, 26
... pouring spout, 35 ... porous barrier, 42-obstruction' ¥1
<-...Twin belt type continuous casting machine. Yoshi 1 figure 72 figure

Claims (1)

[Scope of Claims] (1) Casting using a tandy-7, which consists of a receiving part for receiving molten metal and a tapping part for dispensing the molten metal, and the drawing parts are separated by a porous layer made of ceramic. A method for producing copper wire characterized by: (2) The porous layer made of ceramic has an average diameter of 0.5 to 3 txm and a porosity of 50 to 90
% special. (H Manufacture of copper wire according to claim 1)
Tsunon left 5. (, l) When the thickness of a porous layer made of ceramic is T am and the porosity is α%, 200/α≦T
The method for manufacturing a copper wire according to claim 1, wherein the fork has a relationship of ≦700/α. (4) Copper wire assembly J2L according to claim 1, 2 or 3, wherein the ceramic is copeillite.
force law. (5) The method for manufacturing a copper wire according to claim 1, 2, 3, or 4, wherein the tank inosu is a lubrication trough. (6) The method for producing a copper wire according to claim 5, wherein the casting is performed using a twin-belt continuous casting machine.