JPH0259112A - Wire drawing die - Google Patents

Abstract

PURPOSE:To uniformize working quality by providing an approach section and die hole section on the die hole section, controlling an approach angle within a prescribed angle in the range where the inner diameter of the approach section is specified fold of the inner diameter of the die hole section. CONSTITUTION:The approach section 12 and die hole section 13 are formed continuously on the hole part of the drawing die 11. At this case, in the range where the diameter (d0) of the approach section 12 is 1.05-1.20 fold of the diameter (d1) of the die hole section 13, the approach angle alpha1 is controlled to be <=4 deg.. Further, between that part and the die hole section 13, the approach angle alpha2 is formed to be >4 deg. and to become larger gradually. By this method, because the approach angle of the part where the blank stock is contacted with at first is small, the uniformized wire drawing is performed, generations of a seizure, etc., are reduced. Therefore, the quality of the wire drawing is uniformized.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a wire drawing die suitable for use in drawing a composite wire having a soft metal jacket.

``Prior art'' When wire drawing is performed, an extremely large amount of pressure is applied between the die and the material, so it is common practice to use an appropriate lubricant to prevent wear and seizure of the die. be.

However, when drawing a composite wire whose metal jacket is softer than the metal core, such as aluminum wire,
When wire drawing is performed using an ordinary conical die, there is a problem that the metal core material and the metal outer sheath are not processed uniformly. That is, as shown in FIG. 2, when the composite wire 3 is drawn through the die hole 2 of the conical die l and wire drawn, the metal core material 4 at the center is not deformed, but the soft material at the outer periphery is Only the metal jacket 5 tends to be mainly deformed. If only the metal sheath 5 is deformed in this way, there are problems such as wire drawing becoming impossible or the thickness of the metal sheath 5 partially varying after wire drawing. .

As a way to solve such problems,
As shown in Publication No. 088, etc., an introduction tube having an inner diameter slightly larger than the outer diameter of the composite wire is attached to the front of the die, and the composite wire and lubricant are passed through this introduction tube to feed the composite wire and lubricant to the die hole. It is known that the above problem can be solved by increasing the pressure of the lubricant and forcing the lubricant into the die hole.

"Problem to be solved by the invention" However, the effect of this type of device cannot be said to be perfect, especially when the cross-sectional area of the metal wave 5 is small in a composite wire where the metal wave 5 is made of a soft material such as aluminum When drawing a composite wire or the like whose cross-sectional area is larger than the cross-sectional area of the metal core material 4, troubles such as overlapping still occur.

It is known that reducing the approach angle of the conical die can reduce the above-mentioned troubles, but if the approach angle is reduced, the contact length between the 1-summer line and the die hole becomes longer, so There is a problem that causes troubles such as the wire and die sticking together.

The present invention has been made to solve the above problems,
It is possible to reduce the approach angle at the start of contact between the material to be processed and the die, and at the same time shorten the contact length between the die and the material.Furthermore, it has the effect of increasing the pressure of the lubricant to prevent problems such as seizure. The purpose of the present invention is to provide a wire drawing die that can reduce the amount of wire drawn.

"Means for Solving the Problems" In order to solve the above problems, the present invention provides an approach part and a die hole part from the die inlet part side to the die outlet part side, and the approach angle of the approach part is set to the inlet part side. It is formed so that it becomes larger from the side to the exit side, and the inner diameter of the approach portion is 1.5 mm larger than the inner diameter of the die hole.
The approach angle is set to 4° or less in the range of 0.05 to 1.20 times.

"Function" Since the approach angle of the approach part, which has an inner diameter equivalent to 1.05 to 120 times the inner diameter of the die hole, is 4 degrees or less, the material to be wire drawn and the approach part are initially The approach angle at the part where it contacts will be 4° or less. Therefore, even if the outer metal wave is made of a material such as a composite wire made of a soft material, the entire outer metal wave and the metal core material are uniformly processed and drawn. Furthermore, since the approach angle of the die hole elevation j of the approach part is large, the contact length between the material and the approach part is shortened compared to a conical die with a constant approach angle. Furthermore, since the approach angle of the approach part is small, the elongated gap created between the outer peripheral surface of the material and the inner peripheral surface of the approach part serves as a lubricant introduction path, and the lubricant is reliably introduced to the inside of the die under high pressure. sent.

Embodiment FIG. 1 shows a wire drawing die according to an embodiment of the present invention. The wire drawing die 11 of this example has a shape that gradually tapers from the die inlet side to the outlet side. Approach section 12
A continuous die hole portion I3 is formed on the die exit side on the forward side of this approach portion 12. Note that a mouse ff14 is formed at the die opening, and a back relief section 15 is formed at the die outlet.

The approach section 12 has a bell-shaped cross-sectional profile. Then, assuming that the diameter of the approach part 12 is d,
Assuming that the diameter of the die hole 13 is d, I,0
5d, <d. In the portion where the relationship <1.20d is not satisfied, the approach angle α is greater than 0° and less than 4°.

The reason for limiting the approach fi7 to 4° or less in such parts is that when drawing wire with a die, if the area reduction rate is 10 to 30%, the material before wire drawing must first be drawn through the die. This is because it is the part in this range that comes into contact with the approach section of the. Therefore, the approach angle for this range is 4
When the angle is less than 4°, the approach angle at the portion where the material first contacts the approach portion I2 of the wire drawing die 11 can be made 4° or less. In addition, in the part between the part where the approach angle is 4° or less and the die hole I3, the approach angle indicated by α in FIG. 1 is larger than 4°, and the approach angle α is the die hole I3. It is formed so that it becomes larger as it approaches. Further, the portion extending from the portion where the approach angle is limited to 4° or less toward the mouse portion 14 side is sloped to the same magnitude as the approach angle, or is formed so that the approach angle is Oo.

In addition, in FIG. 1, L indicates the length of the mouse portion 14, and 7. indicates the length of the approach portion 12, L3 indicates the length of the die hole portion 13, and 74 indicates the length of the back relief portion 5.

Next, a case where a composite wire such as an aluminum-coated steel wire is drawn using the wire drawing die 11 having the configuration shown in FIG. 1 will be described.

In the wire drawing die 11 having the structure of this example, among various materials, the cross-sectional area of the metal core +4 is larger than the cross-sectional area of the metal core +4 (for example, the cross-sectional area of the metal core +4 is 45 to 60%) is suitable for wire drawing.

That is, as shown in FIG. 1, the composite wire 20 drawn into the wire drawing die 11 from the population side of the die is
The diameter of the die hole 1 is gradually reduced.
3, and is pulled out from the die hole I3 and processed to a desired diameter.

At this time, since the approach angle is set to a small value of 4° or less at the part where the composite wire 20 and the approach part 12 first come into contact, the composite wire has a large cross-sectional area ratio of the metal coating. It is possible to uniformly deform the metal core material and the metal outer wave.

In addition, in the part near the population side of the wire drawing die 11,
During wire drawing, an elongated gap S is formed between the outer circumferential surface of the degree wire 20 and the inner circumferential surface of the approach section 12. Therefore, when wire drawing is performed by supplying lubricant to the wire drawing die 11, this gap S serves as the introduction path for the lubricant, so that the lubricant is reliably supplied to the inside of the wire drawing die 11 under high pressure. can be supplied.

Further, since the approach angle of the approach KtJ12 increases as it approaches the die hole 13, it is shorter than the approach angle of the conical die, where the approach angle is constant. Therefore, compared to a conical die or the like, the contact length between the composite wire 20 and the approach portion I2 can be made shorter. Therefore, if the wire drawing process is performed using the wire drawing die II of this example, it is possible to prevent the composite wire 20 from sticking to the die 1. In addition, since the approach angle increases as it approaches the die hole 13 as described above, the approach angle at the portion where the composite wire 20 and the approach portion 12 first come into contact can be made sufficiently small. Therefore, this was not possible with conventional conical dies.
An extremely small approach angle of 2° or less can be achieved, and in this case, the composite wire 20 can be processed more uniformly.

By the way, by using the die II having the above configuration alone, the composite wire 20 can be drawn sufficiently, but in order to further increase the lubricant pressure, the gravity of the die 11 is applied to the outer diameter of the composite wire 20. An introduction pipe with a slightly larger inner diameter may be attached to facilitate introduction of the lubricant.

"Manufacturing Example" A plurality of dies having the structure shown in FIG. 1 were manufactured and an aluminum-coated steel wire was drawn. An example of the dimensions of each part of the produced die is L1 = 2mm, L = 23mm, L
3=4mm, L4=1mm, a,=l'α,=8
°, dI = 4.5mm5do = 5.0mm.

When an aluminum-coated steel wire with an outer diameter of 7.0 mm was drawn to a length of 3.5 mm using a plurality of dies having this structure, the wire drawing process was able to be performed without any troubles such as wire breakage or poor wire drawing.

For comparison, wire drawing was performed at the same processing rate using a conical die with an approach angle of 4°; however, problems such as wire breakage and partial variations in the thickness of the outer wave metal occurred.

"Effects of the Invention" As explained above, the present invention has a die hole of +1<1.
In the approach part with an inner diameter of 05 times to 1.20 times, the approach angle of that part is set to 4 degrees or less, and the angle of the approach part on the side closer to the die hole is gradually increased. Therefore, the approach angle of the part where the material first contacts the approach part can be kept below 4 degrees.The small approach angle allows the entire core material to be drawn uniformly, and the contact between the material and the approach part can be reduced to 4 degrees or less. The length can be made shorter than that of a conical die to eliminate sticking. Therefore, by using the die of the present invention, even if the metal coating is soft and the metal coating has a high cross-sectional area ratio, such as a composite wire, the entire wire can be drawn uniformly without causing problems such as seizure or processing defects. effective.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view for explaining a state in which a compound wire is drawn using a conventional conical die. ! ■ ・Wire drawing die, 12...Abutment part, 13
-Die hole, α1...Approach part, 20...Composite line, do -Inner diameter of approach part, d, Inner diameter of die hole.

Claims (1)

[Claims] An approach portion and a die hole are provided from the die inlet side to the die outlet side, the approach angle of the approach portion increases from the inlet side to the exit side, and the inner diameter of the approach portion is A wire drawing die characterized in that an approach angle is formed to be 4° or less in a portion of the die hole in a range of 1.05 to 1.20 times the inner diameter.