JPH046446B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing bright wire by drawing a wire with a wire drawing machine.

[Conventional technology]

As the iron wire for plating the surface, a so-called bright wire, which has a particularly smooth and glossy surface, is used. In order to manufacture bright wire by drawing a wire with a wire drawing machine, it is necessary to completely remove scale from the surface of the raw material wire. If even a small amount of scale remains on the wire surface before wire drawing, scratches will remain on the wire after wire drawing, making it impossible to obtain a high-quality bright wire.

Therefore, in the past, the present inventor had already
No. 148811 discloses a method for completely descaling a wire by bending the wire and buffing the surface of the wire using a buffing wheel consisting of a wire brush and a buffing wheel consisting of a nylon brush in the wire drawing pretreatment process. ing.

The conventional bright wire manufacturing method is to pre-process the wire rod, apply lime liquid to the surface, apply saponified oil or other powdered lubricant to the dried wire rod, and then pass it through a die. First, a regular wire rod with a diameter slightly thicker than the final target wire diameter is manufactured. Next, this ordinary wire is passed through another finishing die in order to further process it into a bright wire with excellent gloss and good adhesion of the plating layer when plated. At this time, the ordinary wire rod obtained in the previous wire drawing process is pickled with hydrochloric acid or sulfuric acid in the next pretreatment process to completely remove the film of powdered lubricant used during the previous wire drawing process. After dropping the wire, it is thoroughly washed with water, a lime soap solution is applied, and the pretreated wire is drawn through a single finishing die at low speed while still wet with the lime soap solution. You're getting the wire.

The purpose of obtaining bright wire is not simply to improve the surface luster of the wire. Bright wire is rarely used as it is, but it is used as chrome-plated copper wire by applying chrome plating or the like on it. When chrome plating is applied to wire drawing material, if the chrome plating is applied after pickling ordinary wire drawing material that is not Brightwire, the film of the powdered lubricant used during wire drawing will remain slightly on the surface even after pickling. Because the plating remains, the plating does not adhere completely to the wire drawing material and easily peels off.

Therefore, when the ordinary drawn wire material is passed through a finishing die at low speed after the complicated pretreatment described above, the surface gloss increases significantly and becomes a bright wire, and the film of powdered lubricant is completely removed. Therefore, if this bright wire is simply pickled and then directly chrome plated, the plating layer will completely adhere to the wire surface and a chrome plated steel wire with excellent gloss will be obtained.

In this way, in the past, in order to completely plate the surface, it was essential to turn ordinary wire drawing material into bright wire through a more complicated pretreatment and finishing wire drawing process that involved passing through a die at low speed. .

[Problem that the invention seeks to solve]

According to the conventional bright wire manufacturing method described above, since the wire is pickled in the pre-treatment process before being passed through the finishing die, pinholes are generated on the wire surface, and these pinholes do not disappear during the wire drawing process. , the final process remains, and the quality of the bright wire product deteriorates. Furthermore, wire rods that have been pickled and drawn in the pre-treatment process cannot be stored for more than 3 to 7 days after being drawn, as rust will occur during storage, and the wire rods should be sent to the plating process immediately after drawing. There is a need.

In addition, the conventional bright wire manufacturing method has the disadvantage that the wire is passed through a finishing die, the drawing speed is slow, and the productivity is low.

Therefore, an object of the present invention is to provide a method for manufacturing bright wire that does not have pinholes, does not rust during storage, and can be stored for a long period of time. Another object of the present invention is to provide a bright wire manufacturing method that can increase the wire drawing speed.

[Means for solving problems]

In order to achieve the above object, the present inventor has conducted intensive research and found that the occurrence of pinholes can be prevented by mechanically descaling the wire without pickling in the pre-treatment process of the wire before wire drawing. In addition, it was discovered that the drawn bright wire does not rust even when stored for a long period of time, and it has been found that the drawn bright wire can be drawn in multiple stages using two or more dies, and that it can be drawn in multiple stages using two or more dies, and that it can be drawn in multiple stages using two or more dies. By lubricating the wire process with a vegetable-based solid lubricant and passing the wire through water before entering the final stage die, we have found that a bright wire with an extremely smooth surface can be obtained and the wire drawing speed can be increased. This discovery led to the completion of the present invention.

That is, the present invention provides a bright wire manufacturing method in which iron wire is descaled in a pretreatment step and then drawn using a wire drawing machine, which includes (a) a step of mechanically descaling the wire by bending and buffing; b) Applying an aqueous solution of a water-soluble lubricant to the wire and drying it; (c) Applying a powdered lubricant mainly composed of saponified oils and fats to the wire; (d) Passing the wire through the first stage die. (e) passing the wire rod through water; and (f) passing the wire rod through a final stage die.

Next, the content of the present invention will be explained in detail. In order to descale the wire before drawing it, it was
According to the known method disclosed in No. 148811, when the wire is run while being bent in various directions by bending rollers arranged facing each direction, most of the brittle primary scale on the surface of the wire peels off and falls off.
Next, when the wire is slid and run through a buffing wheel made of a rotating wire brush and a buffing wheel made of a nylon brush containing an abrasive, the secondary scale firmly attached to the surface of the wire is completely removed.

An aqueous solution of a water-soluble lubricant containing borax as a main component is applied to the wire rod from which scale has been completely removed mechanically in this manner. As the coating method, known methods such as a method of spraying the aqueous solution onto a running wire, a method of running the wire in a water tank containing an aqueous solution, etc. are used. The wire coated with the aqueous lubricant solution is dried by a known method such as blowing hot air onto the wire or running the wire while winding it around a drum in a dryer.

Next, a die box 1 as shown in FIG.
The dry wire 2 whose surface is thinly coated with lubricant as described above is passed through the wire. The die box 1 is partitioned into a front chamber 4 and a rear chamber 5 by a partition wall 3. A first stage die 6 is provided on the partition wall 3 side of the front chamber 4, and a final stage die 7 is provided at the rear end of the rear chamber 5. The front chamber 4 contains a powdered lubricant 8 whose main component is saponified vegetable oil, and the rear chamber 5 contains water 9.

The wire rod 2 passes through a powder lubricant 8 and passes through a first stage die 6.
, then through water 9, and the final stage die 7.
guided by.

The area reduction rate of the wire rod by the final stage die 7 (reduction in the cross-sectional area of the wire rod by passing through the die/cross-sectional area of the wire rod before passing through the die) is preferably 8 to 12%. If this area reduction rate is less than 8%, the smoothness of the surface of the bright wire product will decrease and sufficient gloss will not be produced.
If this area reduction rate exceeds 12%, seizure will occur and the quality of the product will deteriorate.

The area reduction rate of the first stage die 6 is determined by the raw material wire and the thickness of the wire required as a product, but is usually 10 to 20%.

Figure 2 shows the die box 1 used in the present invention.
2 shows another embodiment of. In this case, the die box 1 is partitioned into three chambers, and a front chamber 10 is provided further forward of the front chamber 4. A die 11 for preliminary wire drawing is provided at the rear end of the preparatory chamber 10, and a known solid powder lubricant for wire drawing 12 is placed in the preparatory chamber 10. After passing the wire through the solid powder lubricant in the pre-drawing chamber 10, the wire is pre-drawn by the preliminary wire-drawing die 11, and the desired wire is drawn using two dies, the first-stage die 6 and the final-stage die 7. The wire is drawn to an appropriate wire diameter. In the case of FIG. 2, the preferable area reduction rate of the final stage die 7 is the same as in the case of FIG. In FIG. 2, the wire is passed through three dies in succession, but the pre-chamber 10 and the pre-chamber 4 are separated, a wire winding drum is placed between them, and the wire 2 is passed through the pre-drawing die 11. The wire 2 may be introduced into the front chamber 4 after being wound around a wire winding drum to loosen the tension of the wire.

In the above description of the case where the wire rod 2 is predrawn before being introduced into the front chamber 4, the preliminary wire drawing consists of a step of passing the wire rod 2 through a known solid powder lubricant 12 and a step of passing it through a preliminary wire drawing die 11. Although the case where the wire rod is passed through the process only once has been described, depending on the thickness ratio of the raw material wire rod and the target product wire rod, the above-mentioned known solid powder lubricant may be applied before the wire rod is passed through the front chamber 4. The wire is passed through the preliminary wire drawing process an arbitrary number of times, and the wire is drawn to the desired wire diameter using two dies, the first stage die 6 and the final stage die 7. The wire can be pre-drawn to a thickness that can be drawn up to the desired thickness. In this case, while the wire is passed through the preliminary wire drawing process multiple times, it is necessary to pass the wire through a wire winding drum as appropriate to maintain the tension of the wire at an appropriate level during the process.

[Effect]

According to the bright wire manufacturing method of the present invention,
After being mechanically descaled and dried, the surface of which is coated with a thin layer of water-soluble lubricant is predrawn as necessary, and then powdered with saponified vegetable oil, etc., is drawn in the front chamber 4 of the die box 1. The powdered lubricant 8 is attached to the surface of the powdered lubricant 8, and the wire passes through the first stage die 6 while being lubricated with the lubricant, and is subjected to the first stage wire drawing action.

Next, the powdered lubricant 8 passes through water in the rear chamber 5, and most of the powdered lubricant 8 remaining on the surface of the wire is washed away by the water, but some remains adsorbed on the surface. At the same time, the wire is cooled to an appropriate temperature in water and passed through the final stage die 7.
pass through. At this time, water and a small amount of lubricant remaining on the wire surface act extremely effectively as lubrication.

Further, since the final stage die 7 is placed in the water in the rear chamber 5 and is directly cooled, the cooling efficiency is good and the final stage die 7 does not seize even when wire is drawn at high speed.

When the wire rod 2 is predrawn and immediately passed through a powdered lubricant 8 made of a saponified vegetable oil, etc., the temperature of the wire rod 2 rises due to the preliminary drawing, and the high-temperature wire rod is made of a saponified oil, fat, etc. In contact with the powder lubricant 8,
The lubricant easily adheres to the wire surface, and the lubricating effect of the first stage die 6 and the final stage die 7 is improved.

〔Example〕

Next, the method of the present invention will be specifically explained using Examples. FIG. 3 is a process diagram showing an embodiment of the bright wire manufacturing method of the present invention.

In the drawing, the raw wire 20 enters the drawn wire pre-treatment device 13 and travels while being bent in the vertical, left and right directions by bending rollers 14, and most of the primary scale on the surface of the raw wire 20 is peeled off. . Next, a buffing wheel 15 made of a wire brush and a buffing wheel 23 made of a nylon brush containing an abrasive.
Polish the surface of the raw wire 20 one by one by polishing the remaining 1
Completely polish and remove the secondary scale and the secondary scale that adheres to the surface of the wire underneath. A lubricant coating device 24 sprays and coats the wire with an aqueous solution of a water-soluble lubricant containing borax as a main component, and the wire is wound and run around a drum in a drying device 16 to be completely dried.

The wire 2 that has been pretreated in this way is sent to the wire drawing device 17-a, passes through the solid powder lubricant 12, passes through the preliminary wire drawing die 11-a, and is passed through the lower part of the wire drawing device 17-a. It is wound around the take-up drum 18 several times and pulled, then passed through the solid powder lubricant 12 and passed through the preliminary wire drawing die 12-b, and then the upper take-up drum 19
Wind it up while towing it. The wire rod 2 wound on the upper winding drum 19 is continuously unwound from above the upper winding drum 19 and sent to the next wire drawing device 17-b.

Similarly to the wire drawing device 17-a, the wire drawing device 17-b also coats the wire 2 with the solid powder lubricant 12, the preliminary wire drawing die 11-c, the lower winding drum 18, the solid powder lubricant 12, and the preliminary wire drawing. The wire is passed through the wire die 11-d, wound onto the upper winding drum 19, continuously unwound from above, and sent to the next wire drawing device 17-c.

In the wire drawing device 17-c, the wire rod 2 is passed through a pre-chamber 10 containing a solid powder lubricant 12 and a preliminary wire drawing die 1.
1-e, a front chamber 4 containing a powdered lubricant 8 containing saponified vegetable oil and fat as a main component, a first stage die 6, a rear chamber 5 containing water, and a final stage die 7 are passed in this order. After that, the wire rod is wound up while being pulled onto the wire rod winding drum 21. This is continuously unwound from the top of the drum and wound up by a wire winding device 22 to form a bundle 25 of bright wire as a product. In Fig. 3, if the final stage die 7 is removed, water is not put into the rear chamber 5, and the drawn wire material that has passed through the first stage die is wound on the wire winding drum as it is, it becomes a substantially normal drawn wire material with low luster. can get.

Bright wire A obtained in the example of the bright wire manufacturing method of the present invention obtained through all the steps according to the bright wire manufacturing method of the present invention shown in FIG. 3 is shown in FIG. 3 as described above for comparison. , a drawn wire material B obtained by a process of a comparative example in which only passing through the water in the rear chamber 5 and passing through the final stage die 7 is omitted will be compared.

Bright Wire A had excellent gloss, and when it was pickled with dilute hydrochloric acid and then electroplated with chrome in a chrome plating bath, a chrome-plated steel wire with excellent adhesion of the plating layer was obtained.

On the other hand, the drawn wire material B has a dull luster, and when it is pickled with dilute hydrochloric acid in the same manner as above and then electroplated with chrome in a chrome plating bath, the adhesion of the plating layer is poor, and when the wire is bent, it easily The plating layer peeled off.

FIG. 4 is a process diagram showing another embodiment of the bright wire manufacturing method of the present invention. In this case wire rod 2
The process is exactly the same as that shown in FIG. 3 until it leaves the second wire drawing device 17b, but in the third wire drawing device 17-c, the wire 2 is first coated with solid powder lubricant 12.
Pass through the preliminary wire drawing die 11-e,
After being wound around the lower winding drum 18 several times, a front chamber 4 containing a powdered lubricant 8 mainly composed of saponified vegetable oil, a first stage die 6, a rear chamber 5 containing water,
It is successively passed through the final stage die 7 and wound up while being pulled onto the upper winding drum 19. This is continuously unwound from the top of the drum, and the wire winding device 22
The bright wire is wound into a bundle 25 of bright wire as a product.

FIG. 5 is a process diagram showing another embodiment of the bright wire manufacturing method of the present invention. In this case, the process until the wire 2 leaves the drying device 16 of the drawn wire pretreatment device 13 is exactly the same as in the case of FIGS. 3 and 4. The wire rod 2 leaving the drying device 16 is transferred to a pre-chamber 10 containing a solid powder lubricant 12 in a die box 1;
Preliminary wire drawing die 11, front chamber 4 containing powdered lubricant 8 mainly composed of saponified vegetable oil, first stage die 6, rear chamber 5 containing water, and final stage die 7 are successively installed. The bright wire is passed through the wire and wound while being pulled by the wire winding device 22 to form a bundle 25 of bright wire as a product.

The bright wire manufacturing method of the present invention is as follows.
The method is not limited to the method of the above embodiment shown in the process diagram in the figure, but depending on the thickness of the raw wire material 20 and the bright wire of the product and the quality required for the product.
The number of preliminary wire drawing dies 11 and the arrangement of the winding drums can be determined as appropriate.

〔Effect of the invention〕

According to the bright wire manufacturing method of the present invention,
It is possible to produce a bright wire with no pinholes, an extremely smooth surface, and excellent gloss. Compared to conventional bright wire manufacturing methods, wire drawing speed can be significantly increased, improving productivity. Since no acid is used to pre-treat the wire, no acidic substances remain on the wire surface of the product, and no rust will occur on the surface even if the wire is stored for a long period of one year or more.

Since pickling is not used for pre-treatment of the wire, there is no need for post-treatment of the pickling solution, and there is no risk of pollution.

[Brief explanation of drawings]

FIG. 1 is a partially sectional plan view of a die box used in the present invention, and FIG. 2 is a partially sectional plan view of another embodiment of the same die box. 3 to 5 are process diagrams of an embodiment of the bright wire manufacturing method of the present invention. 1...Dice box, 2...Wire rod, 3...Partition wall, 4...Front chamber, 5...Rear chamber, 6...First stage die, 7...Final stage die, 8...Powdered lubricant , 9
... Water, 10 ... Preliminary chamber, 11 ... Preliminary wire drawing die, 12 ... Solid powder lubricant, 13 ... Wire drawing wire pretreatment device, 14 ... Bending roller,
15... Buffing car made of wire brush, 16...
Drying device, 17...Wire drawing device, 18...Lower winding drum, 19...Upper winding drum, 20...Raw wire rod, 21...Wire rod winding drum, 22...Wire rod winding device, 23... ...Buffing car made of nylon brush,
24... Lubricant applicator, 25... Winding bundle.

Claims (1)

[Claims] 1. A bright wire manufacturing method in which iron wire is descaled in a pretreatment step and then drawn in a wire drawing machine, including: (a) mechanically descaling the wire by bending and buffing; , (b) a step of applying an aqueous solution of a water-soluble lubricant to the wire rod and drying it; (c) a step of applying a powdered lubricant mainly composed of saponified oil and fat to the wire rod; (d) a step of putting the wire rod into a first stage die. (e) passing the wire through water; (f) passing the wire through a final stage die. 2. In the method for producing bright wire according to claim 1, (b) applying an aqueous solution of a water-soluble lubricant to the wire;
Between the step of drying and (c) the step of applying a powdered lubricant mainly composed of saponified oil and fat to the wire, the wire is passed through a known solid powder lubricant and passed through a die. A bright wire manufacturing method that involves passing it through a preliminary wire drawing process once or multiple times. 3. The bright wire manufacturing method according to claim 1 or 2, wherein the final stage die has an area reduction rate of 8 to 12%. 4. The step of mechanically descaling the wire by bending and buffing involves running the wire while repeatedly bending it in each direction with a bending roller, peeling off most of the scale, and then using a wire brush and a wire brush while running the wire. 3. The method for producing bright wire according to claim 1, comprising the step of sequentially buffing the surface of the wire with a nylon brush containing abrasive powder. 5. The method for producing bright wire according to claim 1 or 2, wherein the water-soluble lubricant is a lubricant containing borax as a main component.