JP7177625B2 - multi dice - Google Patents

Description

The present invention relates to multi-dice.

Conventionally, multi-dies are disclosed in, for example, Japanese Patent Application Laid-Open Nos. 2003-48014, 2005-46899 and 8-57531.

JP 2003-48014 A JP-A-2005-46899 JP-A-8-57531

A conventional multi-die has a problem that the quality of the drawn wire is low.
SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems.

A multi-die according to an aspect of the present invention includes a first die having a first bearing, a second die having a second bearing smaller in diameter than the first bearing, located downstream of the first die, and the first die and a holder for fixing the second die in the axial direction, radial direction and circumferential direction, and at least one of the first die and the second die is drawn by the first die and then by the second die. Passages are provided for the discharge of lubricant after it has been supplied to the previous wire.

4 is a cross-sectional view of the multi-dice according to Embodiment 1; FIG. 2 is a front view of the first die viewed from the direction indicated by arrow II in FIG. 1; FIG. FIG. 3 is a side view of the first die seen from the direction indicated by arrow III in FIG. 2; 2 is a front view of the second die viewed from the direction indicated by arrow IV in FIG. 1; FIG. 5 is a side view of the second die viewed from the direction indicated by arrow V in FIG. 4; FIG. FIG. 8 is a cross-sectional view of a multi-dice according to Embodiment 2; FIG. 10 is a cross-sectional view of a multi-dice according to Embodiment 3; FIG. 8 is a front view of the first die seen from the direction indicated by arrow VIII in FIG. 7; FIG. 9 is a side view of the first die viewed from the direction indicated by arrow IX in FIG. 8; FIG. 8 is a front view of the second die viewed from the direction indicated by arrow X in FIG. 7; FIG. 11 is a side view of the second die viewed from the direction indicated by arrow XI in FIG. 10; FIG. 12 is a cross-sectional view of a multi-die according to Embodiment 4; 13 is a front view of the first die seen from the direction indicated by arrow XIII in FIG. 12; FIG. FIG. 14 is a side view of the first die seen from the direction indicated by arrow XIV in FIG. 13; 13 is a front view of the second die viewed from the direction indicated by arrow XV in FIG. 12; FIG. 16 is a side view of the second die viewed from the direction indicated by arrow XVI in FIG. 15; FIG. FIG. 11 is a cross-sectional view of a multi-die according to Embodiment 5; 18 is a front view of the first die seen from the direction indicated by arrow XVIII in FIG. 17; FIG. FIG. 19 is a side view of the first die seen from the direction indicated by arrow XIX in FIG. 18; 18 is a front view of the second die viewed from the direction indicated by arrow XX in FIG. 17; FIG. FIG. 21 is a side view of the second die viewed from the direction indicated by arrow XXI in FIG. 20; FIG. 11 is a cross-sectional view of a multi-die according to Embodiment 6; FIG. 23 is a front view of the first die seen from the direction indicated by arrow XXIII in FIG. 22; 24 is a side view of the first die seen from the direction indicated by arrow XXIV in FIG. 23; FIG. 23 is a front view of the second die seen from the direction indicated by arrow XXV in FIG. 22; FIG. FIG. 26 is a side view of the second die viewed from the direction indicated by arrow XXVI in FIG. 25; FIG. 14 is a cross-sectional view of a multi-die according to Embodiment 7; 28 is a front view of the first die seen from the direction indicated by arrow XXVIII in FIG. 27; FIG. FIG. 29 is a side view of the first die seen from the direction indicated by arrow XXIX in FIG. 28; FIG. 28 is a front view of the second die viewed from the direction indicated by arrow XXX in FIG. 27; FIG. 31 is a side view of the second die viewed from the direction indicated by arrow XXXI in FIG. 30; FIG. 20 is a cross-sectional view of a multi-die according to an eighth embodiment; FIG. 33 is a front view of the first die seen from the direction indicated by arrow XXXIII in FIG. 32; 34 is a side view of the first die seen from the direction indicated by arrow XXXIV in FIG. 33; FIG. 33 is a front view of the second die viewed from the direction indicated by arrow XXXV in FIG. 32; FIG. 36 is a side view of the second die viewed from the direction indicated by arrow XXXVI in FIG. 35; FIG. FIG. 20 is a cross-sectional view of a multi-dice according to Embodiment 9; 38 is a front view of the first die seen from the direction indicated by arrow XXXVIII in FIG. 37; FIG. FIG. 39 is a side view of the first die seen from the direction indicated by arrow XXXIX in FIG. 38; FIG. 20 is a cross-sectional view of a multi-die according to a tenth embodiment; 41 is a front view of the first die seen from the direction indicated by arrow XLI in FIG. 40; FIG. 42 is a side view of the first die seen from the direction indicated by arrow XLII in FIG. 41; FIG. FIG. 20 is a cross-sectional view of a multi-dice according to Embodiment 11; 44 is a front view of the first die seen from the direction indicated by arrow XLIV in FIG. 43; FIG. 45 is a side view of the first die seen from the direction indicated by arrow XLV in FIG. 44; FIG. FIG. 32 is a cross-sectional view of a multi-die according to Embodiment 12; 47 is a front view of the first die seen from the direction indicated by arrow XLVII in FIG. 46; FIG. FIG. 48 is a side view of the first die seen from the direction indicated by arrow XLVIII in FIG. 47; FIG. 32 is a cross-sectional view of a multi-die according to a thirteenth embodiment; 50 is a front view of the first die seen from the direction indicated by arrow L in FIG. 49; FIG. FIG. 51 is a side view of the first die seen from the direction indicated by arrow LI in FIG. 50; FIG. 20 is a cross-sectional view of a multi-dice according to Embodiment 14; 53 is a front view of the holder viewed from the direction indicated by arrow LIII in FIG. 52; FIG. FIG. 54 is a cross-sectional view along the LIV-LIV line in FIG. 53; FIG. 54 is a cross-sectional view along the LV-LV line in FIG. 53; FIG. 32 is a cross-sectional view of a multi-die according to a fifteenth embodiment; FIG. 32 is a cross-sectional view of a multi-dice according to Embodiment 16; FIG. 32 is a cross-sectional view of a multi-dice according to Embodiment 17; FIG. 32 is a cross-sectional view of a multi-die according to Embodiment 18; FIG. 60 is a front view of the holder viewed from the direction indicated by arrow LX in FIG. 59; FIG. 61 is a cross-sectional view taken along line LXI-LXI in FIG. 60; FIG. 61 is a cross-sectional view taken along line LXII-LXII in FIG. 60; FIG. 20 is a cross-sectional view of a multi-die according to Embodiment 19; FIG. 64 is a front view of the first die seen from the direction indicated by arrow LXIV in FIG. 63; FIG. 20 is a cross-sectional view of a multi-dice according to a twentieth embodiment; FIG. 20 is a cross-sectional view of a multi-dice according to Embodiment 21; FIG. 20 is a cross-sectional view of a multi-dice according to Embodiment 22; 1 is a schematic diagram of a slip-type wire drawing machine with stepped capstan rollers; FIG. 1 is a schematic diagram of a non-slip wire drawing machine; FIG.

[Description of the embodiment of the present invention]
The multi-dies include a first die having a first bearing, a second die having a second bearing having a diameter smaller than that of the first bearing and located downstream of the first die, and the first die and the second die axially , and a holder fixed in the radial direction and the circumferential direction, and at least one of the first die and the second die applies a lubricant to the wire rod after being drawn by the first die and before being drawn by the second die. A passageway is provided for discharge after delivery.

The first die and the second die may be in direct contact with each other. In this case, the thickness of the multi-dice can be reduced.

The multi-dies include a first die having a first bearing, a second die having a second bearing having a diameter smaller than that of the first bearing, the second die being located downstream of the first die and separated from the first die, and the first die. and a holder for fixing the second die in the axial direction, radial direction and circumferential direction, and a lubricant was supplied to the holder after being drawn by the first die and before being drawn by the second die. A passageway is provided for post-ejection.

The cross-sectional area reduction rate of the second die may be 10% or less.
The first die may have a first diamond with a first bearing, a first mounting material in direct contact with the first diamond, and a first case holding the first mounting material.

The downstream face of the first diamond may be exposed to the passageway. In this case, since the downstream surface of the first diamond is exposed to the passage, chips generated in the first bearing are easily discharged to the passage.

The second die may have a second diamond with a second bearing, a second mounting material in direct contact with the second diamond, and a second case holding the second mounting material.

The upstream face of the second diamond may be exposed to the passageway. In this case, since the upstream surface of the second diamond is exposed to the passage, chips generated in the second bearing are easily discharged into the passage.

The first and second dies may be secured to the holder by shrink fitting, sinter-bonded to the holder, or secured to the holder with an intervening bonding agent. Shrink fitting, sinter bonding, adhesives, and the like make it difficult to remove the first and second dies from the holder, so that the first and second dies can be reliably positioned in the holder. . As a result, the quality of the wire is improved.

The first and second dies are fixed to the holder by a fixture, and it may be possible to remove the first and second dies from the holder by manipulating the fixture. In this case, the first and second dies can be removed from the holder and re-polished.

Japanese Patent Application Laid-Open No. 2003-48014 discloses a multi-die having a plurality of dies housed in a die cylinder. However, the die is radially, axially and circumferentially unfixed.

Japanese Patent Laying-Open No. 2005-46899 discloses a structure in which an approach die is rotatable in the circumferential direction. Therefore, the dice are not fixed in the circumferential direction.

Japanese Patent Application Laid-Open No. 8-57531 discloses a die that is divided into two dies, an entry side die and an exit side die, and arranged in tandem. However, the dies are not fixed radially and circumferentially.

The holder axially, radially and circumferentially fixes the first die and the second die. Therefore, the positions of the first die and the second die are fixed. If the first and second dies are not fixed radially and circumferentially, the first and second dies are arranged along the shape of the wire. Therefore, the wire is processed so as to increase the deviation from the perfect circular shape of the wire. On the other hand, since the first and second dies are fixed to the holder in the radial direction and the circumferential direction, it is possible to process the wire rod with the first and second dies so as to make it nearly a perfect circle. Furthermore, since the lubricant is supplied to the wire after being drawn by the first die and before being drawn by the second die, the quality of the wire can be improved.
[Details of the embodiment of the present invention]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1, the multi-die 1 according to Embodiment 1 has a first die 10 having a first bearing 14 and a second bearing 24 having a diameter D2 smaller than the diameter D1 of the first bearing 14. , a second die 20 located downstream of the first die 10, and a holder for fixing the first die 10 and the second die 20 in the axial, radial and circumferential directions.

The first die 10 and the second die 20 have cases 11 and 21 located on the outer periphery, mounting materials 12 and 22 held by the cases 11 and 21, and diamonds 13 and 23 held by the mounting materials 12 and 22. have. Diamonds 13 , 23 have a first bearing 14 and a second bearing 24 .

The first die 10 and the second die 20 are provided with die holes 15 and 25 for drawing a wire. The die holes 15 and 25 are spaced apart from each other around the same axis.

The direction indicated by the arrow 5 is the drawing direction. A wire rod is supplied along the direction indicated by the arrow 5 to the die holes 15 and 25 . Since the wire rod is drawn in the die holes 15 and 25, it is discharged after being reduced in diameter. The direction parallel to the wire drawing direction (the direction in which the die holes 15 and 25 extend) is the axial direction. The direction orthogonal to the drawing direction is the radial direction. The direction of rotation about the drawing direction is the circumferential direction.

The first bearing 14 and the second bearing 24 of the first die 10 and the second die 20 are made of super hard material such as cemented carbide, ceramics, diamond or cBN. First die 10 and second die 20 may be either monocrystalline or polycrystalline. It may be amorphous. Furthermore, when the first bearing 14 and the second bearing 24 are made of diamond, the diamond may or may not contain a binder.

The first bearing 14 and the second bearing 24 of the first die 10 and the second die 20 are the smallest diameter portions of the die holes 15 and 25 . The shape of the die holes 15 and 25 may be circular, elliptical, or rectangular. The die hole 15 has a reduction, a first bearing 14, a back relief and an exit according to the drawing direction. The die hole 25 has a reduction, a second bearing 24, a back relief and an exit according to the drawing direction.

Mounting materials 12, 22 holding diamonds 13, 23 are made of, for example, sintered bodies. Mounting materials 12 and 22 can be formed by placing the powder around diamonds 13 and 23 and sintering.

The cases 11 and 21 and the mounting materials 12 and 22 are formed by solid-phase diffusion (sintering bonding) between the materials of the mounting materials 12 and 22 and the materials of the cases 11 and 21 when the mounting materials 12 and 22 are sintered. can be joined with In this embodiment, the interfaces between the cases 11 and 21 and the mounting materials 12 and 22 are linear, but the interfaces are made uneven to increase the contact area between the cases 11 and 21 and the mounting materials 12 and 22. The mounting members 12 and 22 may be made difficult to come off from the cases 11 and 21.

Cases 11 and 21 are made of metal such as stainless steel. Cases 11 and 21 form the outer peripheries of first die 10 and second die 20 .

A groove-shaped (concave-shaped) passage 19 is provided in the case 11 and the mounting member 12 . A passage 29 is provided in the case 21 and the mounting member 22 . Two passages 19, 29 form the lubricant passages. The first die 10 and the second die 20 are in direct contact.

An annular holder 30 contacts the cases 11 and 21 to hold the cases 11 and 21 . A first die 10 and a second die 20 are fitted in the ring of the holder 30 . The ring shape of the holder 30 is formed according to the outer shape of the first die 10 and the second die 20 . The outer shape of the first die 10 and the second die 20 may be circular, elliptical, or rectangular.

As a method of fixing the first die 10 and the second die 20 to the holder 30, after the holder 30 is heated and expanded, the first die 10 and the second die 20 are positioned in the holder 30, and the holder 30 is cooled. There is shrink-fitting to fix to the holder 30 by shrinking. Furthermore, as a method for fixing the first die 10 and the second die 20 to the holder 30, solid-phase diffusion of the materials forming the holder 30 and the materials forming the cases 11 and 21, There are methods such as interposing a bonding agent between them and attaching the cases 11 and 21 to the holder 30 with fixtures.

In the case of solid-phase diffusion, the contact portions between the holder 30 and the cases 11 and 21 are heated to a temperature at which solid-phase diffusion occurs, and then cooled to fix the cases 11 and 21 to the holder 30 .

When a bonding agent is interposed, a brazing material, an adhesive, or the like is interposed between the holder 30 and the cases 11, 21, and melted and solidified to fix the cases 11, 21 to the holder 30. be able to.

As a fixture, a bolt, a set screw with a hexagon socket, or the like is screwed into the holder 30, and the cases 11 and 21 can be fixed to the holder 30 by pressing the cases 11 and 21 with the tips of the bolts. . Fixing is released by removing a bolt or the like from the holder 30, and the cases 11 and 21 can be removed from the holder 30. - 特許庁

A lubricant inlet passage 31 and a lubricant outlet passage 32 are formed diametrically through the holder 30 . Lubricant inlet passage 31 and lubricant outlet passage 32 lead to passages 19 and 29 . As a result, the lubricant supplied from the lubricant inlet passage 31 in the direction indicated by the arrow 2 passes through the passages 19 and 29 as indicated by the arrow 3 and is discharged from the lubricant outlet passage 32 as indicated by the arrow 4. be.

That is, the multi-die 1 includes a first die 10 having a first bearing 14, a second die 20 located downstream of the first die 10 and having a second bearing 24 having a smaller diameter than the first bearing 14, and a first A holder 30 is provided for fixing the die 10 and the second die 20 in the axial, radial and circumferential directions. At least one of the first die 10 and the second die 20 has a passage 19 for supplying and discharging a lubricant to the wire after being drawn by the first die 10 and before being drawn by the second die 20. 29 are provided.

The first die 10 and the second die 20 may be in direct contact with each other.
The cross-sectional area reduction rate of the second die may be 10% or less. The cross-sectional area reduction rate is defined as 1-(S2/S1), where S1 is the cross-sectional area of the die before wire drawing with the die and S2 is the cross-sectional area of the wire after wire drawing with the die. be done. If the cross-sectional area reduction rate is more than 10%, the effect of finishing the surface of the wire may be reduced.

The first die 10 includes a diamond 13 as a first diamond having a first bearing 14, a mounting material 12 as a first mounting material in direct contact with the diamond 13, and a case as a first case holding the mounting material 12. 11.

The second die 20 includes a diamond 23 as a second diamond having a second bearing 24, a mounting material 22 as a second mounting material directly contacting the diamond 23, and a case as a second case holding the mounting material 22. 21.

The first and second dies 10, 20 may be sinter-bonded to the holder 30 or fixed to the holder 30 with a bonding agent.

The first and second dies 10, 20 are fixed to the holder 30 by fixtures, and it is possible to remove the first and second dies 10, 20 from the holder 30 by operating the fixtures. good.

As shown in FIGS. 2 and 3, the first die 10 on the inlet side has a passage 19 that is linear in front view and rectangular in cross section. Passage 19 extends from one end of first die 10 to the other end. A passage 19 is provided in the case 11 and the mounting member 12 . Passage 19 reaches die hole 15 provided in the center of first die 10 . A passageway 19 is provided to pass through the die hole 15 and extend in the radial direction of the first die 10 .

As shown in FIGS. 4 and 5, the exit-side second die 20 has a passage 29 that is linear in front view and rectangular in cross section. Passage 29 extends from one end of second die 20 to the other end. A passage 29 is provided in the case 21 and the mounting member 22 . Passage 29 reaches die hole 25 provided in the center of second die 20 . A passageway 29 is provided so as to pass through the die hole 25 and extend in the radial direction of the second die 20 .

In the multi-die 1 configured in this manner, the lubricant is supplied from the direction indicated by the arrow 2 and flows near the first die 10 and the second die 20 as indicated by the arrow 3 . Since scrap generated during wire drawing is carried by the lubricant, it is possible to prevent clogging of the scrap.

Since the first die 10 and the second die 20 are in contact with each other, the dimension in the wire drawing direction indicated by the arrow 5 is reduced. Therefore, the multi-dice 1 can be installed in a small space.

(Embodiment 2)
As shown in FIG. 6, the multi-die 1 according to the second embodiment differs from the multi-die 1 according to the first embodiment in that the lubricant outlet passage 32 is provided in an L shape. In this embodiment, the lubricant outlet passage 32 has a shape bent by 90°. However, the angle is not limited to 90°, and the lubricant outlet passage 32 can be bent at any angle.

(Embodiment 3)
As shown in FIGS. 7 to 11, in the multi-die 1 according to the third embodiment, the widths of the passages 19 and 29 provided in the first die 10 and the second die 20 are different from those in the first embodiment. Since the passages 19 and 29 are wide in Embodiment 3, the side surfaces of the passages 19 and 29 are not provided in the mounting members 12 and 22 but are provided only in the cases 11 and 21 . In this embodiment, when forming the side surfaces of the passages 19 and 29, it is not necessary to process the mounting members 12 and 22, and only the cases 11 and 21 need to be processed, which facilitates processing.

(Embodiment 4)
As shown in FIGS. 12 to 16, in the multi-die 1 according to the fourth embodiment, the shapes of passages 19 and 29 provided in the first die 10 and the second die 20 are different from those in the first embodiment. In Embodiment 4, the side surfaces of passages 19 and 29 are tapered. By forming the tapered passages 19 and 29, the contact area between the side surfaces of the passages 19 and 29 and the coolant is increased as compared with the multi-die 1 of the first embodiment which is not tapered. As a result, more heat can be dissipated from the sides of the passages 19,29.

(Embodiment 5)
As shown in FIGS. 17 to 21, the multi-die 1 according to the fifth embodiment differs from the first embodiment in the shape and width of passages 19 and 29 provided in the first die 10 and the second die 20. As shown in FIGS. In Embodiment 5, the side surfaces of passages 19 and 29 are tapered. By forming the tapered passages 19 and 29, the contact area between the side surfaces of the passages 19 and 29 and the coolant is increased as compared with the multi-die 1 of the first embodiment which is not tapered. As a result, more heat can be dissipated from the sides of the passages 19,29. Furthermore, since the passages 19 and 29 are wide, a large amount of lubricant can flow.

(Embodiment 6)
As shown in FIGS. 22 to 26, in the multi-die 1 according to the sixth embodiment, the shapes of passages 19 and 29 provided in the first die 10 and the second die 20 are different from those in the first embodiment. In Embodiment 6, the side surfaces of passages 19 and 29 are curved. By forming the curved passages 19 and 29, the passages 19 and 29 do not have corners compared to the multi-die 1 of the first embodiment having the rectangular passages 19 and 29. It is possible to prevent chips from accumulating inside.

(Embodiment 7)
As shown in FIGS. 27 to 31, in the multi-die 1 according to the seventh embodiment, the widths of the passages 19, 29 provided in the first die 10 and the second die 20 are different from those in the sixth embodiment. In Embodiment 7, compared with Embodiment 6, passages 19 and 29 are wider and have curved surfaces. By forming the wide curved passages 19 and 29, the passages 19 and 29 do not have corners compared to the multi-die 1 of the first embodiment having the rectangular passages 19 and 29. It is possible to prevent chips from accumulating in 19 and 29. - 特許庁Furthermore, since the passages 19 and 29 are widened, a large amount of lubricant can flow.

(Embodiment 8)
As shown in FIGS. 32 to 36, in the multi-die 1 according to the eighth embodiment, only the first die 10 is provided with passages 19, and the second die 20 is not provided with passages. Although passages 19 are provided only in the first die 10 in this embodiment, passages may be provided only in the second die 20 . The first die 10 and the second die 20 are in contact with each other. Since the passage 19 is provided only in the first die 10, compared with the case where the passage 19 is provided in the first die 10 and the passage 29 is provided in the second die 20, the passage 19 can be easily processed, and the manufacturing cost can be reduced. .

(Embodiment 9)
As shown in FIGS. 37 to 39, in the multi-die 1 according to the ninth embodiment, the width of the passages 19 provided in the first die 10 is different from that in the eighth embodiment. In the ninth embodiment, since the width of the passage 19 is wide, the side surface of the passage 19 is not provided in the mount member 12 but is provided only in the case 11 . The first die 10 and the second die 20 are in contact with each other. In this embodiment, when forming the side surface of the passage 19, it is not necessary to process the mounting material 12, and only the case 11 needs to be processed, thus facilitating the process. The second die 20 is not provided with passages.

(Embodiment 10)
As shown in FIGS. 40 to 42, in the multi-die 1 according to the tenth embodiment, the shape of the passages 19 provided in the first die 10 is different from that of the eighth embodiment. In Embodiment 10, the side surface of passage 19 is tapered. The first die 10 and the second die 20 are in contact with each other. By forming the tapered passage 19, the contact area between the side surface of the passage 19 and the coolant is increased as compared with the multi-die 1 of the eighth embodiment which is not tapered. As a result, more heat can be dissipated from the sides of the passageway 19 .

(Embodiment 11)
As shown in FIGS. 43 to 45, the multi-die 1 according to the eleventh embodiment differs from the eighth embodiment in the shape and width of the passages 19 provided in the first die 10 . In Embodiment 11, the side surfaces of passages 19 and 29 are tapered. The first die 10 and the second die 20 are in contact with each other. By forming the tapered passage 19, the contact area between the side surface of the passage 19 and the coolant is increased as compared with the multi-die 1 of the eighth embodiment which is not tapered. As a result, more heat can be dissipated from the sides of the passageway 19 . Furthermore, since the width of the passage 19 is wide, a large amount of lubricant can flow.

(Embodiment 12)
As shown in FIGS. 46 to 48, the multi-die 1 according to the twelfth embodiment differs from that of the eighth embodiment in the shape of the passages 19 provided in the first die 10 . In the twelfth embodiment, the side surfaces of the passage 19 are curved. The first die 10 and the second die 20 are in contact with each other. By forming the passages 19 with curved surfaces, the passages 19 are not provided with corners as compared with the multi-die 1 of the eighth embodiment having the rectangular passages 19 , so chips are prevented from accumulating in the passages 19 . can be prevented.

(Embodiment 13)
As shown in FIGS. 49 to 51, in the multi-die 1 according to the thirteenth embodiment, the width of the passage 19 provided in the first die 10 is different from that in the twelfth embodiment. In the thirteenth embodiment, compared with the twelfth embodiment, the width of the passage 19 is wider. The passage 19 has a curved shape. By forming the wide curved passage 19, the passage 19 does not have a corner portion as compared with the multi-die 1 of the eighth embodiment having the rectangular passage 19, so that chips do not enter the passage 19. It can prevent accumulation. Furthermore, since the width of the passage 19 is widened, a large amount of lubricant can flow.

(Embodiment 14)
As shown in FIG. 52, the multi-die 1 according to the fourteenth embodiment differs from the multi-die 1 according to the first embodiment in that the first die 10 and the second die 20 are provided separately. . A space between the first die 10 and the second die 20 is the passageway 39 . Lubricant can flow in passage 39 .

The first die 10 is stored in the first die storage space 37 of the holder 30 . The second die 20 is stored in the second die storage space 38 of the holder 30 . The first die 10 is fixed to the holder 30 in the first die storage space 37 . The second die 20 is fixed to the holder 30 in the second die storage space 38 . Both the first die storage space 37 and the second die storage space 38 are annular.

The multi-die 1 includes a first die 10 having a first bearing 14 and a second bearing 24 having a diameter smaller than that of the first bearing 14 . A second die 20 and a holder 30 for fixing the first die 10 and the second die 20 in axial, radial and circumferential directions are provided. The holder 30 is provided with a passage 39 for supplying and discharging a lubricant to the wire after being drawn by the first die 10 and before being drawn by the second die 20 .

As shown in FIG. 53, the opening-shaped second die storage space 38 is circular. A slit-shaped passage 39 is provided so as to pass through the center of the circle. The second die storage space 38 has a cylindrical shape with a bottom 38 b , and a portion of the bottom 38 b is cut out by a passage 39 . Since the cylindrical storage space 38 for the second die has a bottom 38b, the second die 20 contacts the bottom 38b. Thereby, the position of the second die 20 in the wire drawing direction can be determined. Lubricant is supplied from the passage 39 to the second die storage space 38 .

In the cross section of FIG. 54, there is a step between the passage 39 and the first die storage space 37 and the second die storage space 38 . This is because the passage 39 is a rectangular passage provided in the case, and the first die storage space 37 and the second die storage space 38 are cylindrical, and there is a difference in shape between them. be.

As shown in FIG. 55, the ring-shaped holder 30 is provided with a radially extending bridge member 36 . The bridge member 36 is composed of two plate-like members. A passage 39 is provided between the two plate members. One end surface of the bridge member 36 is the bottom 37b, and the other end surface is the bottom 38b.

That is, the multi-die 1 has a first die 10 having a first bearing 14 and a second bearing 24 having a diameter smaller than that of the first bearing 14. and a holder 30 for fixing the first die 10 and the second die 20 in the axial and radial directions. The holder 30 is provided with a passage 39 for supplying and discharging a lubricant to the wire after being drawn by the first die 10 and before being drawn by the second die 20 . Since the entire circumferences of the first die 10 and the second die 20 are connected to the holder 30, leakage of the lubricant from the gap between the first die 10 and the second die 20 and the holder 30 can be prevented.

In the multi-die 1 according to the fourteenth embodiment, there is no need to form passages in the first die 10 and the second die 20 .

(Embodiment 15)
As shown in FIG. 56, the multi-die 1 according to the fifteenth embodiment differs from the multi-die 1 according to the fourteenth embodiment in that the lubricant outlet passage 32 is provided in an L shape.

(Embodiment 16)
As shown in FIG. 57, in the multi-die 1 according to the sixteenth embodiment, only the first die 10 is provided with passages 19, and the second die 20 is not provided with passages. Although passages 19 are provided only in the first die 10 in this embodiment, passages may be provided only in the second die 20 . The first die 10 and the second die 20 are separated from each other.

The passage 19 of the first die 10 is shaped along the passage 39 of the holder 30 . Enlarging the passageway 39 reduces the strength of the bridge member, but the size of the passageway 19 does not affect the size of the bridge member. Therefore, by providing the passage 19, the passage 39 can be made small, and a decrease in the strength of the bridge member can be suppressed.

(Embodiment 17)
As shown in FIG. 58 , in the multi-die 1 according to the seventeenth embodiment, passages 19 are provided in the first die 10 . A passageway 29 is provided in the second die 20 . Passages 19 and 29 are shaped along passage 39 .

Since the passages 19 and 29 are provided in addition to the passage 39, the flow rate of the lubricant can be ensured even if the cross-sectional area of the passage 39 is made small. As a result, it is possible to reduce the cross-sectional area of the passage 39, thereby suppressing a decrease in the strength of the bridge member.

(Embodiment 18)
As shown in FIGS. 59 and 60, two lubricant outlet passages 32 are provided in the multi-die 1 according to the eighteenth embodiment. Correspondingly, the passage 39 also has a branched structure on the downstream side.

In the cross section of FIG. 61, a step exists between the passage 39 and the first die storage space 37 and the second die storage space 38 . This is because the passage 39 is a rectangular passage provided in the case, and the first die storage space 37 and the second die storage space 38 are cylindrical, and there is a difference in shape between them. be.

As shown in FIG. 62, the ring-shaped holder 30 is provided with a radially extending bridge member 36 . The bridge member 36 is composed of two plate-like members. A passage 39 is provided between the two plate members. One end surface of the bridge member 36 is the bottom 37b, and the other end surface is the bottom 38b.

(Embodiment 19)
A bifurcated passage 19 may be formed in the first die 10 as shown in FIGS. 63 and 64 . The lubricant outlet passage 32 is also bifurcated to match the passage 19 as shown in FIG. The structure is not limited to the structure in which the outlet side of the passage 19 is bifurcated, and the inlet side of the passage 19 may be bifurcated.

(Embodiment 20)
A passage 29 may also be provided in the second die 20 as shown in FIG. The passage 29 is bifurcated like the passage 19 shown in FIG. Accordingly, the lubricant outlet passage 32 is bifurcated.

(Embodiment 21)
As shown in FIG. 66, in multi-die 1 according to the twenty-first embodiment, upstream surface 23 f of diamond 23 is exposed to passage 29 . The upstream surface 23f is flush with the surface of the passageway 29. As shown in FIG. Although the upstream surface 23f is flush with the surface of the passage 29 in this embodiment, the upstream surface 23f may protrude from the surface of the passage 29 upstream (toward the diamond 13).

Since the upstream surface 23f of the diamond 23 is exposed to the passage 29, there is an effect that chips generated by the second bearing 24 are easily discharged to the passage 29 side.

(Embodiment 22)
As shown in FIG. 67, in the multi-die 1 according to the twenty-second embodiment, the downstream surface 13f of the diamond 13 is exposed to the passage 19. As shown in FIG. Downstream surface 13f is flush with the surface of passageway 19; Although the downstream surface 13f is flush with the surface of the passage 19 in this embodiment, the downstream surface 13f may protrude from the surface of the passage 19 downstream (toward the diamond 23).

Since the downstream surface 13f of the diamond 13 is exposed to the passage 19, there is an effect that chips generated in the first bearing 14 are easily discharged to the passage 19 side.

In this embodiment, both the downstream surface 13f and the upstream surface 23f are exposed to the passages 19, 29, but the downstream surface 13f is exposed to the passage 19 and the upstream surface 23f is exposed to the passage 29. may not be exposed to

As shown in FIG. 68, a plurality of dies 9 are arranged in a slip type wire drawing machine provided with stepped capstan rollers 101 and 102 . The diameter of the bearing of each die 9 is set so that each pass of each die 9 has a predetermined cross-sectional area reduction rate. The running speed of the wire rod 8 increases each time it passes through the die 9 . Each step of the stepped capstan rollers 101, 102 is designed so that its peripheral speed is always faster than the running speed of the wire. This prevents the wire rod 8 from bending. Therefore, wire drawing is performed while slipping by the speed difference between the traveling speed of the wire rod 8 and the peripheral speed of the stepped capstan rollers 101 and 102 . Since the wire is drawn while slipping, there is a problem that the surface of the wire rod 8 is damaged. The diameter of the wire rod 8 is determined by the diameter of the bearing of the multi-die 1 for finishing which is the final pass. The accuracy of the multi-die 1 for final finishing (bearing diameter, roundness) must be precisely controlled. The performance of the multi-die 1 shown in the embodiment is maximized when used as a finishing die. The die 9 may be composed of the multi-die 1 of the embodiment.

The wire 8 is supplied from the supply bobbin 103 in the direction indicated by the arrow 111 . The wire 8 is drawn by a die. The wire is fed by stepped capstan rollers 101 and 102 . Stepped capstan rollers 101 and 102 rotate in the direction indicated by arrow R1. The outer diameters of the stepped capstan rollers 101 and 102 increase toward the downstream side of the wire rod 8 flow. This is because the cross-sectional area of the wire rod 8 becomes smaller and the feeding speed of the wire rod 8 becomes faster as it goes downstream. Finally, the wire 8 is wound on the winding bobbin 104 .

As shown in FIG. 69, the multi-die 1 according to the embodiment may be applied to a non-slip wire drawing machine. A non-slip type wire drawing machine is a wire drawing machine in which a plurality of wire drawing machines are connected by synchronously controlling the dancer pulley 124, the multi-die 1 and the capstan rollers 121 and 122 as one wire drawing machine. Since the running speed of the wire rod 8 after passing through the multi-die 1 is equal to the peripheral speed of the capstan rollers 121 and 122 which come into contact next, no slip occurs between the wire rod 8 and the capstan rollers 121 and 122 . Since the dancer pulley 124 is rotatable in the direction indicated by the arrow, the distance between the supply bobbin 103, the capstan rollers 121 and 122, and the bobbin 131 can be adjusted by the dancer pulley 124. As a result, the wire 8 can be prevented from slipping on the capstan rollers 121 and 122 .

The embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above-described embodiments, and is intended to include meanings equivalent to the scope of the claims and all modifications within the scope.

1 multi-die, 2, 3, 4, 5 arrow, 8 wire rod, 9 die, 10 first die, 11, 21 case, 12, 22 mounting material, 13, 23 diamond, 14 first bearing, 15, 25 die hole , 19, 29, 39 passage 20 second die 30 holder 31 lubricant inlet passage 32 lubricant outlet passage 36 bridge member 37 storage space for first die 37b, 38b bottom 38 for second die Storage space, 121, 122 capstan rollers, 101, 102 stepped capstan rollers, 103 supply bobbin, 104 take-up bobbin, 124 dancer pulley.

Claims (7)

a first die having a first bearing;
a second die located downstream of the first die, having a second bearing smaller in diameter than the first bearing;
a holder for fixing the first die and the second die in the axial, radial and circumferential directions;
At least one of the first die and the second die is provided with a passage for supplying and discharging a lubricant to the wire after being drawn by the first die and before being drawn by the second die. and
The first die has a first diamond having the first bearing, a first mounting member in direct contact with the first diamond, and a first case holding the first mounting member ,
The second die has a second diamond having the second bearing, a second mounting member in direct contact with the second diamond, and a second case holding the second mounting member ,
A multi-die , wherein at least one of the first case and the second case is provided with a concave shape forming the passage . 2. The multi-die of claim 1, wherein said first die and said second die are in direct contact with each other. 3. The multi-die according to claim 1, wherein the cross-sectional area reduction rate of said second die is 10% or less. 4. The multi-die according to any one of claims 1 to 3 , wherein the downstream face of said first diamond is exposed to said passage. 5. The multi-die according to any one of claims 1 to 4 , wherein the upstream face of said second diamond is exposed to said passage. 6. The first and second dies are fixed to the holder by shrink fitting, sinter - bonding to the holder, or fixed to the holder via a bonding agent. The multi-dice according to any one of . From claim 1, wherein the first and second dies are fixed to the holder by fasteners, and the first and second dies can be removed from the holder by manipulating the fasteners. 6. The multi-dice according to any one of 5 .

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