JPH0246911A - How to draw composite metal wire - Google Patents

Abstract

PURPOSE:To allow efficient drawing without disconnection and laboriousness of a preparatory plan by specifying the inclination angle of an inlet side and a 2nd inclination angle in succession thereto as a die to be used and drawing the composite metal wire while using powder as a lubricating agent. CONSTITUTION:The die hole of the die 1 consists of a 1st slope 1c on the inlet side and a 2nd slope 1d in succession thereto and the respective slopes 1c, 1d are constituted of the 1st inclination angle alpha and the 2nd inclination angle beta. The 1st inclination angle alpha is regulated to <=8 deg. and the 2nd inclination angle betato <=20 deg.. The powder lubricating agent 5 is contained in a box 2 between the die 1 and a guide hole 4. The powder lubricating agent 5 sticks to the surface of the composite metal wire 10 during the movement of the metal wire and is withdrawn into the die hole of the die 1. Even the aluminum coated steel wire of a very small size is easily and stably drawn with good quality in this way without disconnection.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a composite metal wire, particularly a relatively small-sized composite metal wire having a core wire having a high deformation resistance and a coating metal having a relatively low deformation resistance on the outer periphery of the core wire. The present invention relates to a wire drawing method useful for wire drawing.

[Prior Art] Composite metal wires have various configurations, but for example, a steel wire with high deformation resistance is used as a core wire, such as an aluminum Na wire, and the surrounding wire is coated with aluminum having low deformation resistance. In such cases, due to the difference in deformation resistance,
It is surprisingly difficult to draw this wire and reduce its diameter.

To solve this difficulty, a fluid lubrication drawing method and a multi-dice powder wire method have been proposed so far, and some of them have been put into practical use.

FIG. 4 is an explanatory sectional view showing a specific example of the fluid lubrication drawing method.

Prior to diameter reduction by the die 21, a long introduction part 20 is provided, and the composite metal wire 10 passes through this long introduction part 20 and is reduced in diameter by the fluid drawing die 21 to form a drawn wire 10-.
wire is drawn.

A lubricating oil of an appropriate viscosity is supplied to the introduction part 20, and as the composite metal atO is drawn into the introduction part 20 in the direction shown by the arrow, the lubricating oil adheres to the surface of the composite metal wire 10 and is removed from the introduction part 20. sent deep inside. There is a die 21 having an approach part 22 at the back of the introduction part 20, and the fed lubricating oil is rapidly increased in pressure to a high oil pressure at the approach part 22 of the die 21, and the composite metal is not deformed by the high oil pressure. The wire 10 is reduced in diameter at the bearing portion and pulled down through the oil film.

As mentioned above, in the fluid lubrication drawing method, the composite metal wire 10
There is always an oil film between the surface of the die and Type 21, and unlike in conventional solid type wire drawing, the wire does not come into direct contact with the inner surface of the die and cause friction, so a coating layer with low deformation resistance is formed. The composite metal wire 10 as a whole can be stably reduced in diameter without being squeezed by a die.

Moreover, FIG. 3 is an explanatory sectional view showing the multi-dice powder median line method.

A plurality of dies 31, 31', 31'' are connected in series between the wall surface of the box 32 and the fixing jig 36 via spacers 33, 33', and a composite metal wire is inserted through the kite hole 34. 10 passes through a powder (e.g. soap powder) for lubrication and each multi-die 31.31'
, 31'', the wire is drawn to a reduced diameter using powder as a lubricant.

Drawing wire using a large number of dies 31.31'31'' in this way is an attempt to process the wire little by little using multiple dies, and a large cross-sectional reduction ratio is achieved by using only one die. This is because, as mentioned above, the coating layer with low deformation resistance is squeezed backward by the die, and a bulge due to the coating material occurs at the die entrance, making wire drawing impossible. If they are installed in series as shown in the figure, the cross-sectional reduction rate per die is small, and the desired diameter reduction is achieved when passing through all the dies, the above-mentioned squeezing will not occur and the process will be smooth. We can expect wire drawing.

In this case as well, the powder drawn into the die melts due to friction with the wire rod, and it is thought that a pressure increasing effect occurs based on a behavior similar to that of the lubricating oil.

[Problem to be solved by the invention] Recently, aluminum-coated steel wire has been used for benches, small animal intrusion prevention fences, and outdoor installations because of its high strength, excellent outdoor corrosion resistance, and beautiful appearance due to its glossy surface. It has come to be widely used for waste baskets, etc.

The aluminum-coated steel wires used for these are relatively small in diameter, ranging from around 1 inch to 3nl+, and the manufacturing process requires 14 mm of attached wire manufactured by extrusion.
Usually, it is manufactured by α-order drawing wire drawing.

However, when it is attempted to draw such a small-diameter aluminum-coated FGLS wire by the above-described conventional method, it has been found that there is a new problem that has not been seen in the conventional applicable wire diameters.

First, in the fluid lubrication drawing method, lubricating oil is not drawn in sufficiently at the start of wire drawing, and it takes a certain amount of time for the pressure to rise sufficiently and reach a state of fluid lubrication, during which time a large drawing force is required. There is a problem that. Moreover, the viscosity of lubricating oil is sensitive to the outside temperature, and adjusting it is surprisingly time-consuming.

Even at the start of wire drawing, which requires a large drawing force as described above, there was no problem even if the wire drawing was continued forcibly in the case of relatively large diameter wires that were conventionally targeted for wire drawing. However, when the size of the thin wire as mentioned above is reached, wire breakage occurs frequently.

Another problem is that lubricating oil tends to adhere to equipment, which makes the pack tension on the wire unstable, and for the above-mentioned silk sizes, wire breakage occurs during wire drawing.

In addition, in the case of the multi-die Oki wire method, due to its structure, the degree of processing per pass cannot be obtained sufficiently, and the number of passes required for drawing thin wire is extremely large, making it time-consuming. be.

Several dies are required per bus, and as the number of passes increases, it is necessary to prepare many dies before drawing thin wire, which not only increases costs, but also requires the use of dies and spacers each time the pass changes. It is very troublesome to have to replace, reassemble, tighten with a large force, and set. Moreover, as will be described later, only dies with a full angle of about 6 degrees can be used, and there is another problem in that there is no degree of freedom in wire drawing.

An object of the present invention is to solve the above-mentioned problems of the prior art, such as wire breakage and complicated setup for composite metal wires, especially relatively thin composite wires having a coating layer with lower deformation resistance than the core wire. The purpose is to provide a curving method that is problem-free and extremely efficient.

[Means for Solving the Problems] The present invention uses a die with a double-tapered inner surface, in which the first inclination angle on the inlet side is 8° or less, and the subsequent second inclination angle is 20° or less. The gist of this method is to use a die to curve the curve using powder as a lubricant.

[Function] By using a powder lubricant, the problem of the generation of excessive pulling force at the start of a curve, which was observed in the four-body lubrication method, is not only eliminated, but also the above-mentioned 2. By using a step-tapered die, it is possible to achieve a greater degree of machining in one pass than with a conventional multi-die curve.
Not only is it possible to greatly reduce the number of dice (rp), but it is also possible to achieve significant labor savings in curve setup due to the reduction in the number of passes, and to greatly improve efficiency.

[Example] The present invention will be described below with reference to Examples 6. Fig. 1 is a cross-sectional view showing a specific configuration of a curved line device that implements the method according to the present invention.

The die 1 is fixed between the wall surface of the box 2 and the fixture 3, and the composite metal wire 10, which should be curved, is drawn down through the die 1 through the guide hole 4 of the box 2 in the direction of the arrow in the figure. The wire rod 10- is curved.

A powder lubricant 5 made of, for example, soap powder is contained in the box 2 between the die 1 and the kite hole 4, and the powder lubricant 5 adheres to the surface while the composite metal wire 10 moves.
It is drawn into the die hole of die 1.

FIG. 2 is an enlarged cross-sectional view of the vicinity of the die 1 in FIG. No, but in this way the bipartite body 1a
, lb has the advantage that manufacturing of the die 1 becomes easier.

In the die 1 according to the present invention, the die hole consists of a first slope 1c on the entrance side and a 211th slope 1d following it, and each slope 1c, ld is formed by a first slope angle α and a second slope angle β. configured.

Therefore, in the present invention, the first inclination angle α is specified to be 8° or less, and the second inclination angle β is specified to be 20° or less.6 By configuring the inner surface of the die as described above, powder While using a lubricant, it is possible to obtain a much larger one-pass retraction compared to the conventional multi-die curve method, which greatly improves productivity, and also allows composite metal wire to be processed smoothly and with high efficiency without the risk of wire breakage. In particular, it has become possible to curve thin composite metal wires.

Next, this will be demonstrated using the following examples.

Example 1 A curve experiment was conducted using a soft 1i1 wire SWRM10K as a core material and an aluminum-coated steel wire coated with pure aluminum as a test material. Using a die according to the present invention having a first inclination angle α-6° and a second inclination angle β=14°, and using soap powder as a lubricant, the aluminum coated 1 flll wire with a wire diameter of 1.79m+n is cut into a die having a wire diameter of 1.79m+n.
Although the curve was curved at 58 nm, the degree of processing at this time was 22.1%, and the curve could be curved without any problems both during the curve and the restart curve after stopping.

In order to compare with this, the test aluminum coated steel wire having a wire diameter of 1.88+n+n was curved to a diameter of 1.7onon using a conventional fluid lubrication drawing device. The degree of machining at this time was 1862%, which was considerably smaller than the 22.1% described above, but the wire broke when the machine was restarted after stopping.

Example 2 Using the same core material and aluminum-coated steel wire as in Example 1, a curve experiment was conducted with a smaller diameter.

The wire diameter was curved from 0.8m+n to 0.7nw+diameter using the die according to the present invention with a first inclination angle of α-6° and a second inclination angle of β-10”.The degree of processing at this time was 23.4%. Despite this, I was able to take the rlJJ line without any problems.

On the other hand, in the conventional fluid lubrication drawing method, it was possible to create a curve from 0.8 diameter to 0.74 diameter (machining rate 14.4%), or it was possible to create a curve from 0.7 nun diameter, which is the same as in the present invention. A curve with a working degree of 23.496 was not possible.

Example 3 A curve experiment similar to that described above was conducted using an aluminum-coated steel wire made of hard steel wire 5WRH62B as a core material and coated with pure aluminum as a test material.

A die with the same inclination angle as in Example 1 was used, and by the method of the present invention, it was made from 2.66 mm diameter to 2.28 mm diameter (processing degree 26.5%) and from 2-30 mm diameter to 1 mm. -9
I made a curve to a diameter of 9 mm (processing rate 24.2%), but I was able to curve all of them without any problems. 2 The reason why a curve with such a high processing rate is created is that there is no powder in the die. This is thought to be due to the fact that high pressure is generated when the material is drawn in, resulting in good deformation.

In contrast, in the case of the fluid lubricant drawing method, the machining rate is 194%.
Although I was able to create a curve up to that point, I was unable to create a curve with a degree of processing higher than that.

Example 4 A comparison was made between the curve method according to the present invention and the multi-dice normal method using the same core material and aluminum coated steel wire as in Example 013 and the same powder lubricant.

Table 1 shows the curve results according to the present invention, and Table 2 shows the curve results based on the multi-dice normal using three dice.

As can be seen from Table 1, according to the method according to the present invention, the first inclination angle α of the die is 8° or less, and the second inclination angle β is 20°.
It is possible to curve any angle less than 6 degrees, but in the multi-dice method, it is possible to curve only in the extremely limited case where all three die angles are 6 degrees, and it is not possible to curve in other cases. It can be seen that the degree of freedom of the curve exists only in an extremely narrow range.

Table 2 Table 1 [Effects of the Invention] As described above, the wire drawing method according to the present invention can exhibit the following excellent effects.

(1) It is possible to easily and stably perform curves of good quality using silk-sized aluminum coated gA wires without causing troubles such as wire breakage.

(2) ■ The degree of processing per bus can be increased, simplifying setup and saving labor.

(3) It is easy to replace dies, and work efficiency can be greatly improved.

(4) Since the number of dice used is small, the number of dice prepared is also small, and the cost town can be increased accordingly.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing how wire is drawn by the method according to the present invention, Fig. 2 is an enlarged cross-sectional view of the vicinity of the die in Fig. 1, and Fig. 3 shows the conventional multi-die wire drawing method. cross section,
FIG. 4 is a sectional view showing a conventional fluid lubrication drawing method. 1: Dice, 1c: First inclined surface, 1d: Second inclined surface, 2: Box, 3: Fixing jig, 5: Powder lubricant, : Composite metal wire.

Claims (1)

[Claims] (1) Composite metal wire drawn using powder as a lubricant using a die with a two-step tapered inner surface, the first inclination angle of which is 8° or less on the inlet side, and the subsequent second inclination angle is 20° or less. wire drawing method. (2) The wire drawing method according to claim 1, wherein the composite metal wire to be drawn is an aluminum-coated steel wire having a relatively small diameter.