JPH0126763B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing metal wires used as wires, electric wires, or brazing rods for welding, and particularly relates to a method for manufacturing metal wires made of metal materials that are difficult to process. It is related to the method.

[Conventional technology]

Conventionally, the general method for manufacturing metal wire is to hot-roll and cold-roll a billet in the shape of a round bar, then draw it with a hole die to form a wire-making rod material, and then draw it with a wire drawing machine. The method was to gradually draw the wire down to a predetermined thickness.

[Problem that the invention seeks to solve]

However, the amount that can be pulled out by this hole die is determined by the area reduction rate, which is generally around 20%, and if the area reduction rate is increased beyond this, the sliding friction that occurs between the drawing die and the surface of the treated material will increase the resistance. The treated material was torn off due to the overlapping process, making it impossible to perform the drawing process.

Also, there is a large difference in the speed at which the metal is pulled out from the hole die due to the sliding friction of the metal itself.
This difference in sliding friction caused a difference in wire manufacturing productivity.

For this reason, how to reduce this sliding friction will lead to improved productivity, so research and development of lubricants has progressed, and metals with relatively low friction coefficients such as aluminum, copper, copper alloys, iron, etc. With the development of new agents, it became possible to increase the drawing speed.

However, good lubricants have not been developed for so-called difficult-to-process metal materials with a high coefficient of friction, such as titanium, and drawing speeds have still been slow. Comparing this with iron wire, which has a fast drawing speed, for example, if the wire diameter is 2 mmφ and the area reduction rate is 20%, iron wire can be drawn at a speed of 400 to 800 m/min, while titanium wire can be drawn out at a speed of 400 to 800 m/min. The drawing speed was 8 to 14 m, and the difference in drawing speed was more than 50 times, and the productivity of difficult-to-reach wire rods such as titanium was extremely poor.

The method of drawing a cylindrical billet using a hole die required many types of complicated manufacturing equipment, and the equipment cost was high.

However, when manufacturing metal wires, using special metals such as titanium to make metal wires has particularly poor production efficiency and costs a lot of money, resulting in extremely high product costs.

[Means for solving problems]

The present invention was made in view of the above, and has good production efficiency regardless of the coefficient of friction that differs depending on the type of metal.Moreover, it does not use an expensive cylindrical billet, but uses an inexpensive flat plate to reduce the thickness of the metal plate. The present invention provides a novel method for manufacturing a metal wire that can quickly manufacture a metal wire of a desired thickness.

That is, a large number of linear grooves are formed on the surface of a metal plate, and the convex portions formed by the grooves are alternately pulled in opposite directions, and the grooves between the convex portions are pulled and cut. It is characterized in that the shaped portion is a wire rod.

[Effect]

As a result, the convex portion is continuously formed as a metal wire, and by further rolling it, it can be formed into a predetermined cross-sectional shape.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings.
shows a long metal plate made of titanium alloy wound into a coil with a width of 500 mm, a thickness of 2 mm, and a length of 200 m, and a rolling roll 3 with a rectangular groove 2 cut in the metal plate 1.
As shown in Figure 3, cut the corners on both sides.
A plurality of square convex portions 4 having an angle of 90 degrees and concave grooves 5 therebetween are formed by rolling in a straight line. Next, this is passed between two pairs of guide rollers 6 for separating, which have a roll with a small interval followed by a roll with a large interval, and the adjacent convex portions 4 are alternately pulled in opposite directions in the thickness direction, By pulling in the opposite direction by 180°, the grooves 5 between the convex portions are pulled and cut, and the convex portions 4 are taken out as the wire rod 7. This wire rod 7 is then bitten into the round grooves 8 of a pair of forming rolls 9 each having a semicircular groove 8 formed therein, and the burrs protruding on both sides of the wire rod are removed and the corners of the rectangular wire rod 7 are rounded. Then, this is wound up with a take-up reel 10.

These operations are first performed by inputting the end of the metal plate 1 from the rolling roll 3 to the forming roll 9 (advance processing), and then turning on the drive switch to move the rolling roll and forming roll that move at a constant speed. The process is performed continuously. Further, the guide roll does not run by itself, but is rotated by a moving metal plate.

In addition, in order to complete the wire as a perfectly round wire, after passing through the forming roll 9, a peeling die (not shown) is used to remove burrs that occur on the forming roll.
The wire is removed, the surface is polished (gliding), the wire is wound onto a reel, and the wire is cut to a predetermined size to produce a perfect round wire.

In the example, the corner of the convex part was made to have a 90° angle with a rolling roll, but if the corner is made at an obtuse angle of 90° or more, there will be an increase in loss when forming it into a circular shape with a forming roll, and if the corner is made into an acute angle of 90° or less, the edge of the roll will be damaged. 90° is optimal as it will break easily.

〔Effect of the invention〕

As described above, the method of the present invention is fundamentally different from the conventional method of drawing from a hole die, and is not affected by the sliding friction of the metal itself.
Even aluminum, copper, iron, and even titanium, which has traditionally been considered a difficult wire material, can be produced with extremely high production efficiency.

In other words, when making a 2 mmφ wire using a coil material of 2 mm thickness x 500 mm width x 200 mL.

Required time as rolling speed 10m/min Pre-applied treatment Approximately 20 to 30 minutes of rolling 20 minutes total 40 to 50 minutes Product weight 2 x 500 x 4.5 x 0.88 = 792Kg... (However, weight loss rate 12%) Product length 178 pieces x 308 m = 54824 m ≒ 55000 m Wire production speed 1100 m to 1375 m per minute As is clear from the above, the wire production speed of the present invention is completely comparable to the titanium drawing speed of 8 to 14 m per minute described as a conventional example. It is amazingly fast, and compared to the iron drawing speed of 400 to 800 m, it is 2 to 3 times faster.
The wire manufacturing speed increases, and production efficiency is dramatically improved compared to the method of drawing from a hole die. According to this method, production efficiency is improved for all kinds of metals, but it is found that the effect is particularly large for difficult-to-reach wire materials such as titanium.

Furthermore, this manufacturing method does not use a cylindrical billet and can use an inexpensive flat plate, resulting in low material costs and the ability to provide inexpensive wire production.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the overall arrangement of an apparatus to which the method of the present invention is applied, Fig. 2 is an enlarged view of the main parts of Fig. 1, Fig. 3 is a side view of a rolling roll, and Fig. 4 is a forming roll. FIG. 5 is a cross-sectional view of the metal plate after passing through the rolling rolls. 1... Metal plate, 2... Square groove, 3... Roll roll, 4...
Convex portion, 5... Groove, 6... Guide roller, 7... Wire rod, 8... Round groove, 9... Forming roll, 10... Winding reel.

Claims (1)

[Claims] 1. A metal plate that is rewound by a band-shaped metal plate unwinding roll has a plurality of grooves formed at opposing positions on both the front and back sides of the metal plate by blades having a 90° angle provided on the outer periphery of each of a pair of upper and lower rolling rolls. Following a pair of guide rollers formed in a straight line and rotatable behind the rolling rolls, adjacent convex portions are alternately moved in opposite directions in the thickness direction by rotatable separation guide rollers provided above and below. The separated ends of the wire rods obtained by pulling and cutting the respective grooves are fixed to respective take-up reels, and a pair of upper and lower moldings is provided between the take-up reels and the separating guide roller. A method of manufacturing a metal wire with a circular cross section from a metal plate, which is characterized by forming it using rolls.