JP5042275B2 - Diamond dice - Google Patents

Description

  The present invention relates to a diamond die for drawing a metal wire, and more particularly, to a diamond die suitable for processing a wire that easily generates machining scraps with a non-slip type wire drawing machine.

  Conventionally, a slip-type wire drawing machine using a plurality of dies has been used for drawing an ultrafine wire having a wire diameter of several tens of μm or less. However, in recent years, non-slip type wire drawing machines have also been used.

  The slip type wire drawing machine has a simpler and more compact wire drawing device than the non-slip type wire drawing machine. However, problems such as scratches on the surface of the metal wire, breakage due to changes in tension due to fluctuations in frictional resistance, and wear of the die are likely to occur. In order to solve such a problem, a wire drawing method in which a speed difference between a capstan and a metal wire is appropriately set is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-239814 (Patent Document 1).

  On the other hand, the non-slip type wire drawing machine is less likely to be scratched on the surface of the metal wire and is less likely to break, but it is very difficult to increase the size of the wire drawing machine or to keep the tension applied to the metal wire during wire drawing constant. Detailed control is required. This is because the metal wire being drawn is reduced in cross-sectional area each time it passes through the die, and the traveling speed of the metal wire increases, so the tension is likely to be non-uniform. This is because it needs to be controlled. In order to solve such problems, the area reduction rate of each wire drawing die can be arbitrarily changed, and the surface area reduction rate and drawing force of each wire drawing die being processed are monitored in real time. A non-slip type wire drawing machine capable of processing while constantly checking the processing state is proposed in, for example, Japanese Patent Application Laid-Open No. 2005-103623 (Patent Document 2).

  Furthermore, as a further improvement of the above non-slip type wire drawing machine, there is a wire drawing machine in which a dancer roller for applying a back tension to a metal wire is linearly moved substantially parallel to the wire drawing direction of the wire drawing die. No. 3918132 (Patent Document 3).

JP 11-239814 A JP 2005-103623 A Japanese Patent No. 3918132

  However, all of the above-mentioned techniques are improvements related to the wire drawing machine, and it is not mentioned about improving the die as a measure for preventing the wire wire from being easily scratched, and there is an insufficient point. I cannot deny that there is. Even if a slip-type wire drawing machine is used to prevent disconnection, if a metal wire such as a gold wire is drawn, a problem of disconnection still occurs. This is because processing scraps are likely to be generated in the processing of gold wires, and because the gold wires are very sticky, the processing scraps when processed with one die are sent to the next die while remaining on the surface. This is because the material enters the processing hole, clogs the processing hole in the die hole, increases the wire drawing resistance, and breaks. This phenomenon occurs in various metal wires, but there is a tendency to be noticeable in the processing of highly viscous wires such as gold wires or aluminum wires.

  When wire drawing is performed with a diamond die attached to a slip-type wire drawing machine, even if debris adheres to the metal wire, it passes through the capstan before the metal wire is sent to the next die, and the metal wire and cap The machining waste is removed to some extent by the slip generated between the stun. Therefore, when the metal wire is sent to the next die, there is little processing debris adhering to the surface, and the problem of clogging the processing hole is unlikely to occur, so it is considered that the drawing resistance is not easily increased and disconnection is not likely to occur. Yes.

  However, when wire drawing is performed with a diamond die attached to a non-slip type wire drawing machine, as described above, the next diamond die remains while the processing waste when processed with one diamond die remains attached to the surface. It is easy to get into the processing hole, and the diamond die hole is clogged with processing scraps, increasing the wire drawing resistance and making it easy to break.

  Therefore, the present invention has been made to solve the above-mentioned problems, and the present invention prevents disconnection by making it difficult for metal wire processing scraps to clog the diamond die hole, and in particular, non-slip type. An object of the present invention is to provide a diamond die that can make full use of the function of the wire drawing machine when used in a wire drawing machine.

A diamond die according to the present invention is a diamond die provided with a hole for drawing a metal wire by a non-slip wire drawing machine, and the diamond die has a flow of wire drawing so as to define the hole. In the shape of the hole in the cross section along the center line of the hole, the opening angle of the portion closest to the reduction part is 100 in the shape of the hole in the cross section along the center line of the hole. The length of the reduction part is 0.2D or more and 1.0D or less (D is the diameter of the bearing part), and a convex arc surface is provided at the boundary between the approach part and the reduction part. The radius of the circular arc surface is not less than 1 μm and not more than 20 μm.
The opening angle of the reduction part is 5 ° or more and 30 ° or less.

  Since there is a large difference in the opening angle between the approach portion and the reduction portion, a convex arc surface having a radius of 20 μm or less is provided at the boundary portion. The opening angle of the part means the opening angle of the part closest to the reduction part excluding the arc surface.

  In the diamond die according to the present invention configured as described above, the length of the reduction portion is set to 0.2D or more and 1.0D or less so as to be shorter than the conventional one so as to reduce the resistance during wire drawing.

  During wire drawing, the periphery of the diamond die is filled with a working fluid that also serves as a lubrication effect. If the length of the reduction part is long like a conventional diamond die, reduction is performed at the entrance of the reduction part as described above. The machining waste tends to accumulate in the gap between the portion and the wire, and the accumulated processing waste is brought from the reduction portion toward the bearing portion in accordance with the movement of the wire. As a result, it is considered that work scraps are welded to the surface of the wire to increase the wire diameter, increase the resistance, and break the wire.

  When wire drawing is performed with the diamond die of the present invention, when the wire rod with the processing dust attached to the surface tries to enter the processing hole and starts to contact the reduction part, it is extremely located at the boundary between the approach part and the reduction part. It is easy for scraps to come into contact with the sharp convex arcuate surface. Therefore, once the processing waste is separated from the surface of the wire, the processing waste easily flows from the inlet side of the reduction portion to the approach side even if the periphery is filled with the processing liquid. And since the opening angle of the part closest to the reduction part among the approach parts is set to 100 ° or more, the machining waste flowing out from the reduction part to the approach part easily flows to the approach part and the bell part and is easily discharged, and again the reduction part. In addition, it becomes difficult for processing waste to enter the bearing section. As a result, the wire is not welded and the resistance of wire drawing does not increase, so that the wire can be prevented from being disconnected.

  Preferably, a bell portion upstream of the approach portion is further provided, and a shape from the bell portion to the approach portion is a concave curved surface.

  More preferably, by making the shape from the bell part to the approach part into a concave curved surface shape, it becomes easier for the processing waste flowing from the inlet side of the reduction part to the approach part to be held by the approach part, and the reduction part and the bearing part. It is possible to more effectively prevent the processing waste from flowing into.

  The diamond dies as described above are very effective when used for wire drawing with a non-slip type wire drawing machine.

  Moreover, when it uses for the drawing process of either a gold wire, a copper wire, and an aluminum wire, a very big effect is acquired.

  According to the diamond die of the present invention, even if it is a wire rod that easily generates processing scraps such as a gold wire and an aluminum wire, and is easy to weld, it is efficient and high quality without disconnection by a non-slip type wire drawing machine. Can be performed.

It is a figure which shows the cross-sectional shape of the hole of the diamond die according to Embodiment 1 of this invention. It is a figure which shows the cross-sectional shape of the hole of the diamond die according to Embodiment 2 of this invention. It is a figure which shows the cross section along the central axis of a hole in the diamond die according to a comparative example. It is sectional drawing for demonstrating the state at the time of wire drawing in the diamond die according to Embodiment 1 of this invention. It is sectional drawing for demonstrating the state at the time of wire drawing in the diamond die according to a comparative example. It is a figure which shows the wire drawing machine with which the diamond die according to this invention is used.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  FIG. 1 is a diagram showing a cross-sectional shape of a hole of a diamond die according to Embodiment 1 of the present invention. FIG. 1 shows a cross-sectional shape of the hole 2 when the diamond die is cut along a cross section along the central axis of the hole 2. The upper side of FIG. 1 is the entrance side of the wire. The hole 2 of the diamond die 1 is defined from the upper side by a bell portion 3, an approach portion 4, a reduction portion 5, a bearing portion 6, a back relief portion 7 and an exit portion 8.

  From the bell portion 3 to the approach portion 4, the opening angle A at the position closest to the reduction portion 5 in the approach portion 4 is 100 ° to 180 °, and the opening angle B of the reduction portion 5 is 5 ° to 30 °. The length of the reduction part 5 is not less than 0.2D and not more than 1.0D (D is the diameter of the bearing part 6), and the length of the bearing part 6 is not less than 0.2D and not more than 0.8D.

  The length of the reduction portion 5 is significantly shorter than that of the conventional diamond die, and the portion where the gap between the wire before drawing and the inner surface of the hole 2 of the diamond die 1 is narrow is minimized. It has become a shape. The boundary between the reduction portion 5 and the approach portion 4 is an arc surface 111 having a radius R of 20 μm or less.

  The bearing portion 6 is a portion of 0 ° to 1.5 ° with respect to the drawing axis of the wire, and the reduction portion 5 is upstream of the flow of the wire from the inlet of the bearing 6 and downstream of the arc surface 111. The approach part 4 and the bell part 3 refer to the upstream side of the arc surface 111.

  FIG. 2 is a diagram showing a cross-sectional shape of a hole of a diamond die according to Embodiment 2 of the present invention, and FIG. 2 shows a cross-section of the diamond die cut along a plane along the central axis of the hole 2. FIG. Similar to the first embodiment, the diamond die 1 has a bell part 3, an approach part 4, a reduction part 5, a bearing part 6, a back relief part 7 and an exit part 8 from the upper side.

  Similar to the diamond die 1 of FIG. 1, in the diamond die 1 according to the second embodiment, the opening angle A at the position closest to the reduction portion 5 in the approach portion 4 is 100 from the bell portion 3 to the approach portion 4. The opening angle B of the reduction portion 5 is 5 ° to 30 °, the length of the reduction portion 5 is 0.2D to 1.0D (D is the diameter of the bearing portion 6), The length of the bearing part 6 is 0.2D or more and 0.8D or less. The shape from the bell portion 3 to the approach portion 4 is a concave curved surface 112, and the opening angle on the inlet side of the bell portion 3 is smaller than 100 °. In FIG. 1, the shape from the bell portion 3 to the approach portion 4 is a convex curved surface 113. However, when drawing is performed by making the shape as shown in FIG. 2, the shape from the surface of the wire rod The separated processing waste is discharged to the approach portion 4 side, and this processing waste is easily held by the approach portion 4 portion having the concave curved surface 112 shape. As a result, the amount of processing waste entering between the wire and the reduction portion 5 in accordance with the movement of the wire is reduced to more than that of the diamond die 1 in FIG. 1, and the effect of preventing troubles such as wire breakage becomes higher. . The boundary between the reduction portion 5 and the approach portion 4 has a sharp convex curved surface shape with a radius R of 20 μm or less, like the diamond die 1 of FIG.

  FIG. 3 is a diagram showing a cross section along the central axis of the hole in the diamond die according to the comparative example. The upper side of the figure is the entrance side of the wire, and the respective parts are in order of the bell part 3, approach part 4, reduction part 5, bearing part 6, back relief part 7 and exit part 8 from the upper side so as to be defined in the hole. Provided. As the shape of a diamond die according to a comparative example that is generally used, the opening angle of the approach portion 4 is 40 ° or more and 60 ° or less, the opening angle of the reduction portion 5 is 5 ° or more and 15 ° or less, and the length is 100 μm. The length of the bearing portion 6 is not less than 250 μm and not more than 10 μm and not more than 20 μm.

  When such a diamond die 1 is attached to a non-slip type wire drawing machine and the wire drawing is performed, the next diamond die remains while the processing scraps produced by one diamond die 1 remain attached to the surface of the wire. The wire rod is sent to 1 and the processing waste is clogged in the hole 2. As a result, the wire drawing resistance increases and breaks easily.

  FIG. 4 is a cross-sectional view for illustrating a state at the time of wire drawing in the diamond die according to the first embodiment of the present invention. FIG. 4 shows the periphery of the processing portion when the diamond die 1 is attached to a non-slip type wire drawing machine and wire drawing is performed. The processing scraps 12 remain attached to the surface of the wire 11 to be drawn and fed into the reduction unit 5. At this time, the processing scraps 12 adhering to the surface of the wire rod 11 come into contact with the sharp convex arc surface 111 formed at the boundary between the reduction portion 5 and the approach portion 4, so that the processing scrap from the wire rod 11. The part where 12 is separated and the gap between the reduction part 5 and the wire 11 is narrow is very small as compared with the case where a conventional diamond die is used. As a result, the processing waste 12 is easily discharged to the approach portion 4 side. Thereby, it is significantly reduced that the processing waste 12 enters between the wire 11 and the reduction portion 5 in accordance with the movement of the wire 11, and the processing waste 12 is not welded to the wire 11. Therefore, troubles such as stable disconnection without increasing resistance during wire drawing are extremely unlikely to occur.

  FIG. 5 is a cross-sectional view for explaining a state at the time of wire drawing in a diamond die according to a comparative example. It is fed into the reduction unit 5 with the processing waste 12 attached to the surface of the wire 11 to be drawn. And although the processing waste 12 adhering to the surface of the wire 11 contacts the surface of the reduction part 5 once, it leaves | separates from the wire 11 once, but it is easy to collect in the clearance gap between the reduction part 5 and the wire 11, and the processing waste 12 which collected. Since the wire enters between the wire 11 and the reduction portion 5 in accordance with the movement of the wire 11, it becomes easy to weld to the wire 11. As a result, resistance at the time of wire drawing increases and eventually breaks.

  FIG. 6 is a diagram showing a wire drawing machine using a diamond die according to the present invention. Referring to FIG. 6, in a wire drawing machine, a wire 11 which is a metal wire before being drawn is wound around an unwinding bobbin 13, and the wire 11 is fed out to form a plurality of capstans 15 and diamonds. The wire is drawn while passing through the dies 1 a, 1 b, and 1 c and wound on the winding bobbin 14. In order to feed the wire 11, the capstan 15 is driven by a drive motor, and the diamond dies 1 a, 1 b, 1 c and their surroundings are filled with a lubricating liquid. In the non-slip type wire drawing machine, the wire rod 11 is driven in a state in which no slip occurs between the capstan 15 and the wire rod 11 with the peripheral speed of the capstan 15 equal to the traveling speed of the wire rod 11 to be processed.

  In the slip type wire drawing machine, the wire 11 is driven in a state in which the peripheral speed of the capstan 15 is higher than the traveling speed of the wire 11 to be machined and slip occurs between the capstan 15 and the wire 11. Let

  The diamond die 1 according to the present invention as described above has an approach portion 4, a reduction portion 5 and a bearing portion 6 from the upstream side to the downstream side of the wire drawing flow so as to define the hole 2. In the shape of the hole 2 in the cross section along the center line of 2, the opening angle A on the reduction part 5 side of the approach part 4 is 100 ° or more and 180 ° or less, and the length of the reduction part 5 is 0.2D or more and 1 0.0D or less (D is the diameter of the bearing portion 6), and a convex arc surface 111 is provided at the boundary between the approach portion 4 and the reduction portion 5, and the radius R of the arc surface is 20 μm or less. . The opening angle of the reduction unit 5 is preferably 5 ° or more and 30 ° or less.

  A diamond die having the shape shown in FIG. 1 was attached to the non-slip type wire drawing machine shown in FIG. Specifically, as the diamond die 1a shown in FIG. 6, the diamond die 1 shown in FIG. 1 was used, and the diamond dies 1b and 1c in FIG. At this time, the opening angle A of the approach portion of the diamond die 1a of FIG. 6 and the length of the reduction portion 5 are variously changed, the wire diameter before drawing is set to 21 μm, and the drawing speed (drawing speed) is set to 500 m / Using a sample in which the line type is gold, the radius R of the circular arc surface 111 is 15 μm, the opening angle B of the reduction part 5 is 12 °, and the diameter D of the bearing part 6 is 20 μm. Table 1 shows the results of the test.

  Further, the opening angle A of the approach part 4 and the radius R of the circular arc surface 111 are variously changed, the wire diameter before drawing is set to 21 μm, the drawing speed (drawing speed) is set to 500 m / min, and the wire type is set to gold wire. The wire was drawn using a sample in which the reduction length was 0.5D, the opening angle B of the reduction portion 5 was 12 °, and the diameter D of the bearing portion 6 was 20 μm. The results are shown in Table 2.

  “...” in Table 2 indicates test results for samples in which the radius R of the arc surface 111 at the boundary between the reduction portion and the approach portion is 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 μm. ing.

  In addition, the radius R and the reduction length of the arc surface 111 are variously changed, the wire diameter before drawing is set to 21 μm, the drawing speed (drawing speed) is set to 500 m / min, the wire type is set to a gold wire, and the opening angle Wire drawing was performed using a sample in which A was 140 °, the opening angle B of the reduction portion 5 was 12 °, and the diameter D of the bearing portion 6 was 20 μm. The results are shown in Table 3.

  “...” in Table 3 indicates test results for samples in which the radius R of the arc surface 111 at the boundary between the reduction portion and the approach portion is 7, 8, 9, 10, 11, 12, 13, 14, 15, 16 μm. ing.

  According to Tables 1 to 3, the opening angle A of the approach portion 4 must be 100 ° or more and 180 ° or less, the length of the reduction portion 5 should be 0.2D or more and 1.0D or less, and the radius R of the circular arc surface 111 should be 20 μm or less. I found out that

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The diamond die of the present invention can provide a great effect with a non-slip type wire drawing machine, but the effect of the present invention can also be obtained with a slip type wire drawing machine as compared with the case where a conventional diamond die is used.

  1,1a, 1b, 1c Diamond die, 3 bell part, 4 approach part, 5 reduction part, 6 bearing part, 7 back relief part, 8 exit part, 11 wire rod, 12 processing scrap, 14 winding bobbin, 15 capstan 111 arc surface, 112, 113 curved surface.

Claims (3)

A diamond die for a non-slip wire drawing machine provided with a hole for drawing a metal wire,
The diamond die has an approach part, a reduction part and a bearing part from the upstream side to the downstream side of the wire drawing flow so as to define the hole,
In the shape of the hole in the cross section along the center line of the hole, the opening angle of the portion closest to the reduction portion of the approach portion is 100 ° to 180 °, and the length of the reduction portion is 0.2D to 1. a 0D less (D is the diameter of the bearing portion), a boundary between said approach portion the reduction section is a circular arc surface of the convex is provided, the radius of the arcuate surface is Ri der least 20μm or less 1 [mu] m, A diamond die having an opening angle of the reduction part of 5 ° to 30 ° .   The diamond die according to claim 1, which is used for wire drawing of any one of a gold wire, a copper wire and an aluminum wire.   The diamond die according to claim 1 or 2, further comprising a bell portion upstream of the approach portion, wherein a shape from the bell portion to the approach portion is a convex curved surface.

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