JPS6227559A - Manufacture of hot dip tin coated copper wire - Google Patents

Abstract

PURPOSE:To improve production efficiency, by performing electricity conduction heating in coating line part contg. the first and second tin coating vessels, at hot dip tin coating of hard copper wire in both vessels in order to anneal hard copper wire by electricity conduction to coat it with tin. CONSTITUTION:A core wire 8 rewound from a hard copper wire bobbin 9 is pretreated at a washing vessel 1, a water soluble flux vessel 2, and surface of the wire 8 is hot dip tin coated in the first hot dip tin coating vessel 3. Next, the wire is further hot dip tin coated in the second hot dip tin coating vessel 5 and wound by a winding bobbin 10. At this time, a power supplying apparatus 4 is provided to impress low voltage between the vessels 3 and 5 as electrodes, and the wire 8 is electricity conduction heated in an electricity conduction section 11. Heat quantity thrown in the running wire 8 is controlled to about 1X10<-5>-8X10<-5>cal. In this way, since tin is coated while electricity conduction annealing the wire 8, batch annealing can be omitted, and production efficiency is improved.

Description

[Detailed Description of the Invention] <Industry> Second Field of Application The present invention relates to a method for manufacturing hot-dip tin-plated copper wire, and in particular improves the annealing method so that during the hot-dip tin plating process, in air,
The present invention relates to a method for manufacturing hot-dip tin-plated copper wire that can be continuously annealed.

<Prior Art> Copper wire generally has high corrosion resistance, but tin-plated wire is used to improve soldering workability.

In addition, in the case of wrapping connections, there is little increase in contact resistance,
Tinned wire is also used in Lapping River.

Conventionally, tin-plated copper wire has been produced by drawing a rough drawn copper wire, subjecting it to -I annealing, and then tin-plating it by hot-dip plating or electroplating. Such annealing before plating may involve patch annealing of bobbin-wound hard copper wire or running annealing before the plating line, but both have the following problems.

1) When batch annealing bobbin-wound hard R#4 wire.

(a) In a bobbin-wound wire, bonding between the wires easily occurs depending on the winding tension and annealing conditions, and it is difficult to unwind the bonded wire. In some cases, the wire may break and become unusable.

(b)&j! Wire drawing lubricant remains on the copper wire.

This changes in quality or becomes carbonized by annealing, making it difficult to remove in pretreatment before plating. However, the wire drawing lubricating oil can be easily removed by organic solvents, alkaline detergents, electrolytic degreasing, etc., unless it is subjected to annealing heat.

(C) When unwinding a bobbin-wound wire, if the bobbin-wound wire is annealed, the winding curl is fixed, and the wire is likely to be rounded by unwinding. No bobbin winding annealing required.

If it is a hard copper wire, the wire itself has the power to unwind, making it easy to feed out. In addition, hard copper wire has a slight amount of wire drawing lubricant remaining on its surface, which helps the wire slip.
It becomes even easier to rewind.

2) When performing running annealing before the mejiki line.

(a) In particular, when applying electrical annealing to ultrafine wires of 0.1 to II), 26 mmφ, it is expensive to control the circumferential speed of the rotating sheave and maintain the contact angle in order to ensure contact between the electrode and the wire. equipment and controls are required.

(b) When annealing ultra-fine wires, oxidation of the surface causes a significant deterioration of properties, so heating must be performed in a non-oxidizing atmosphere, and atmospheric gas and steam are often required as consumables. It is.

(c) For running annealing, indirect heating is often performed using a tubular furnace, or a combination of current heating and indirect heating is often used, but in addition to the installation and maintenance of the tubular furnace, this requires However, the difficulty of the above-mentioned power supply method and ensuring a protective atmosphere are important.

3) The same annealing effect can be obtained by increasing the temperature of the molten tin tank during plating and increasing the length of the plating tank or lowering the linear speed.
% or more, the tin temperature should be above 350℃, and the linear speed should be l.
00 raisin or more, it will not be possible to achieve the 1-minute characteristic. Therefore, productivity will deteriorate due to low speed, increase in oxidation loss of expensive tin due to high temperature tin, loss of heating energy in tin furnace with low thermal efficiency, etc., so this is a good method. Not.

<Problems to be Solved by the Invention> The purpose of the present invention is to solve the above-mentioned disadvantages of batch annealing and running annealing, and to process hard copper wire at low speed in a plating line in large numbers in air. Among these, the present invention provides a method for manufacturing soft hot-dip tin-plated copper wire while easily carrying out current annealing. Step 4: The invention is to apply hot-dip tin plating to a hard copper wire in a first tin-plating bath, and then to apply hot-dip tin plating to a hard copper wire in a second tin-plating bath. A method for manufacturing a hot-dip tin-plated copper wire, comprising: performing one current heating in a plating line portion including the first tin-plating tank and the second tin-plating tank, when manufacturing the tin-plated copper wire. It is.

The invention will now be described in detail with reference to preferred embodiments shown in the drawings.

The production of the hot-dip tin-plated copper wire of the present invention is preferably carried out using the apparatus shown in FIG.

In the plating line shown in Fig. 1, the core wire 8 drawn out from a hard copper wire pobbin 9 is washed in a cleaning tank 1, and then pretreated in a water-soluble flux tank 2. 3, hot-dip tin plating is applied to the surface of the core wire 8, and the second hot-dip tin plating tank 5
Then, further hot-dip tin plating was carried out and one winding bobbin lO was obtained.
A tin-plated core wire 8 is wound up.

The present invention is characterized in that the core wire 8 is continuously heated between the first hot-dip tin plating tank 3 and the second hot-dip tin plating tank 5. The electrical heating method is such that the core wire 8 can be annealed while the core wire 8 is monoplated with tin in the first hot-dip tin plating tank and tin-plated as a final product in the second hot-dip tin plating tank 5. Any method may be used.

Preferably, the ':trJl molten tin plating tank 3 and the second molten tin plating tank 5 are used as electrodes, and a low voltage is applied using the power supply device 4 between them, and the first and second molten tin plating tanks are The core wire 8 running between the plating baths is energized by l1fl l1
It is better to use one that heats with electricity. The applied voltage at this time is appropriately determined depending on the thickness of the tin-plated core wire 8 to be heated with electricity. Typical ultra-fine wires are annealed in 1 minute with the application of low voltage.
If it is less than 1 x 10'cal, annealing will not be sufficient,
If it exceeds 8X I O'cal, the appearance of the tin-plated core wire 8 will deteriorate significantly, and not only the surface tin but also the copper of the fabric will be oxidized and discolored.

When plating a large number of core wires 8 at the same time, the power supply device 4 for energization heating responds to changes in the number of core wires due to breakage during plating, the end of the material wire, etc., and voltage fluctuations. Use a transformer with sufficient capacity to minimize the Alternatively, a constant voltage control device may be used, and it is particularly preferable to use a tap transformer for energization heating.

In addition, the point at which the core wire 8 enters the first hot-dip tin plating tank 3 and the second hot-dip tin plating tank 5 changes due to vibration of the core wire 8 or changes in the level of molten tin, so that variations in the 1-current conduction distance do not occur. In addition, it is necessary to keep the vibration of the core wire 8 and the level of molten tin constant.

The length of the energized section 11 is 500 to 3000 mm in the case of ultra-fine wire.
is preferred. This is because if it is less than 500 a+m, the voltage adjustment becomes too fine, and if it exceeds 3000 mm, the voltage is too high and it becomes difficult to handle.

By annealing and heating after tin-plating in the first tin plating tank 3, it is possible to avoid heating the hard copper wire submerged in water-soluble flux, which is done by heating with electricity immediately after the conventional flux tank. . In addition, the first hot-dip tin plating tank 3
It can be powered under sufficient total bending contact to be tin-plated.

Furthermore, since the first orifice 6 of the first molten tin coating bath 3 is very loose, the surface of the plated core wire 8 is
A considerable amount of molten tin remains, and by short-term electrical heating (less than 1 second), surface oxidation of the tin is stopped to a small extent, and friction with the molten tin is prevented during tin plating in the second molten tin coating tank 5. The thin tin oxide on the surface is stripped off, and the tin oxide layer on the surface of the core wire 8 can be removed.

Conventionally, in electrical heating and indirect heating, the core wire wet with water-soluble flux was heated, so it was necessary to heat it in a non-oxidizing atmosphere, but in the present invention, the core wire 8 plated with −・+1 molten tin was heated. Since heating is carried out by electrical current, even an oxidizing atmosphere such as air is acceptable; therefore, there is no need for a protective atmosphere to protect the core wire 8 from oxidation 11- during electrical heating, and there is no need for a cover to maintain this atmosphere. .

The delivery and pretreatment tank for the hard copper wire is appropriately selected from those commonly used, as necessary. It is preferable to use a trichlene cleaning tank as the cleaning tank 1.Although drawing lubricating oil remains in the hard copper wire material, continuous annealing heating is not performed at this stage as in the conventional method. Line lubricating oil can be easily removed by pretreatment such as organic solvents, alkaline detergents, and electric field degreasing.

The first hot-dip tin plating tank 3 uses a first aperture 6 with a very loose gap, for example, a gap of 0.01 mm or more in terms of mW difference, and uses a flux effect to ensure a sufficient amount of copper-tin wetting. It serves as an electrode 11 for generating and passing current for electrical annealing. This results in long immersion lengths and
High temperatures are not required.

The immersion length and immersion method in the first and second tin plating baths 3.5 may be of any type, as long as the method does not increase the tension of the wire as much as possible.

150-250m for ultra-fine wire of 0.1-0.28mmφ
The length of the first hot-dip tin plating tank 3 is 100 mm at a linear speed of /sin.
mm was sufficient. O, less than 1mmφ or 0.26■
For wires exceeding φ, the length of the bath may be adjusted according to the wire speed so as to provide enough immersion time to obtain sufficient wetting of the copper wire and the amount of tin. Further, any method may be used as the dipping method, such as a method in which the molten tin is heaped up using a jet type method, or a method in which the wire is passed through a cylindrical melting furnace in a straight line without bending.

The plating line may be one in which the core wires 8 are fed as a single line, but generally, for process control purposes, a large number of core wires 8 are fed through the plating line at the same time. In the case of multiple wires, a partition for the purpose of insulation is required to prevent short circuits between the running wires during electrical heating. In particular, there is a risk that the end of the core wire may come into contact with another adjacent core wire 8 when the wire is broken or passed through.

Guide boot 〇-1 for feeding the core wire 8 used in the first tin plating bath 3, the second tin plating bath 5, and the energization heating section 11
2 and a sinker 13 for dipping the core wire 8 into the plating bath.
is preferably made of ceramic.

If you run the wires between the first tin plating tank 3 and the second tin plating tank 5 while the current is being applied, the wires may be fused due to sparks, etc., so pass the specified number of wires through the wires without passing them through at the bottom, and then switch Insert the product winding pobin], connect O with 6 +, 3 cut ++
It is desirable to wind it up.

<Example> Example Hot-dip tin-plated copper wire was manufactured using the hard copper wire shown in Table 1 using the plating line shown in FIG. The first hot-dip tin plating tank 3 has an immersion length of 100 mm.

Zero current section 11 is automatically temperature controlled to 250°C.
Annealed at 2780 ■. The second hot-dip tin plating tank 5 had an immersion length of 700 mm and was automatically temperature controlled at 260°C. The wire speed, the first drawing die, the applied voltage, the applied current, and the second drawing die were those shown in Table 1, respectively.

The properties of the obtained hot-dip tin-plated copper wire were measured and are shown in Table 1.

Separately, as a comparative example, a punch annealed material wire plated with tin was similarly measured, and the results are shown in Table 1. The obtained hot-dip tin-plated conductive wire has properties equivalent to or better than general hot-dip tin-plated wire, and has various insulation properties. : Excellent as a conductor for wires.

When winding and unwinding the bobbin, there was no curling, and it was easy to unwind and unwind the bobbin.

<Effects of the Invention> (1) Since the hard drawn wire is used as the material 1 and tin plating is performed while electrically annealing, patch annealing of the material 4 wires can be omitted. As a result, the processing time for the 4-core wire is shortened, production efficiency is increased, and orders with short lead times can be accommodated.

(2) Various defects caused by punch annealing of the material wire are avoided.

- The occurrence of defects due to mutual adhesion (metallurgical crimping) of the bobbin 48 wires is avoided.

- Discoloration due to defects in the annealing atmosphere is avoided.

This prevents deterioration of the wire drawing lubricant residue into solid Z, deterioration, carbonization, etc., which is difficult to remove by pre-plating treatment, due to heating during the heating process.

(3) Since the surface of the running wire is covered with tin due to electrical annealing heating, tin oxide is formed, but this tin oxide is transferred to the second hot-dip tin plating bath under the voltage and current that maximizes the elongation of the plated wire. It is easily removed and does not remain on the surface of the wire. Therefore, no special non-melting atmosphere is required.

(4) Continuous current heating before tin plating requires a contact electrode such as a contact sheave on the running core wire, but since the present invention uses a molten tin bath as the electrode, there is no need for maintenance. The annealing conditions can be electrically controlled and are highly reliable.Especially in the case of tin-plated fine wires, each of which is long and requires a considerable amount of time to complete plating the entire length. The annealing conditions are easy to maintain and the product is highly reliable.

(5) Since there is no need to obtain an annealing effect in a molten tin bath, the temperature of the molten tin bath is 250 to 260°C for 1 minute in the method of the present invention, and heating for annealing is also efficient and direct. It is a very effective method because it uses electrical current heating, and the heat for annealing is brought into the second hot-dip tin plating tank, so it is also an advantageous method.

[Brief explanation of the drawing]

FIG. 1 is a diagram of a plating apparatus used in the method of manufacturing hot-dip tin-plated copper wire of the present invention. Code theory 1 liter

Claims (2)

[Claims] (1) After hot-dip tin-plating the hard copper wire in the first tin-plating tank, the hot-dip tin plating is performed in the second tin-plating tank to produce a tin-plated copper wire. 1. A method for producing a hot-dip tin-plated copper wire, characterized in that heating is performed by energizing a plating line portion including a first tin-plating tank and a second tin-plating tank. (2) The electrical heating is performed in the first tin plating tank and the second tin plating tank.
2. The method for producing a hot-dip tin-plated copper wire according to claim 1, wherein the method is carried out using a tin-plating bath as an electrode.