JP2008110360A - Method and apparatus for manufacturing metal ball, and copper ball anode for plating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing metal balls, capable of efficiently manufacturing the metal balls without heating a stock. <P>SOLUTION: The method for manufacturing metal balls enables the molding of the metal balls from a long-shaped material S by cold-rolling the material while using at least a set of molding rolls 30, 30. The material S is arranged so as to elongate along an axial line L. Ball materials are manufactured from the stock S by rotating each of the set of molding rolls 30, 30 on its rotation axis M respectively and further revolving each of the set around the axial line L along the outer peripheral surface of the stock S. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a metal ball manufacturing method and a metal ball manufacturing apparatus for forming a ball material from a long material by rolling with a set of forming rolls, and particularly used as a copper raw material in electrolytic plating of copper. The present invention relates to a metal ball manufacturing method, a metal ball manufacturing apparatus, and a plating anode copper ball manufactured by this manufacturing method, which are optimal for manufacturing a plated anode copper ball.

Conventionally, metal balls such as an anode copper ball for plating used when copper plating is applied to a printed wiring board are manufactured by hot rolling as disclosed in, for example, Patent Document 1.
In this hot rolling, a long material is cut into a certain length and heated, and the heated short material is supplied between a set of forming rolls while rotating around the axis of the material. The ball material is formed along the forming groove formed on the outer peripheral surface of the ball. In this method, a metal ball having a high sphericity can be formed.

On the other hand, as disclosed in Patent Document 2, for example, a method of manufacturing a metal ball by cold forging is also provided.
In this cold forging, a long material is divided for each ball, forged with a die having a hemispherical cavity and a punch, and placed in a spherical mold formed by the die and the punch. A ball material is formed by filling a metal.
JP 2000-54199 A JP 2003-181590 A

By the way, in the hot rolling disclosed in Patent Document 1, since the material is heated at the time of rolling, the crystal grains of the metal balls become coarse. For this reason, there has been a problem that a large amount of sludge is generated when an anode copper ball for plating manufactured by hot rolling is used. In addition, since an oxide film is formed on the surface, it is necessary to perform a treatment such as pickling after hot rolling.
Furthermore, in order to rotate the material itself, the material is cut into short pieces and supplied between the forming rolls, but both ends of the material cannot be formed into a ball shape. Will occur a lot.

  On the other hand, in the cold forging disclosed in Patent Document 2, there is no problem such as coarsening of crystal grains and formation of an oxide film because the material is not heated, but a metal ball with high sphericity is formed. Was difficult. Further, since the ball material is formed by filling a spherical mold with a metal, the contact area between the material and the mold is wide, and large power and equipment are required. Further, there has been a problem that noise during ball forming becomes large.

  The present invention has been made in view of the above-described circumstances, and a metal ball manufacturing method capable of efficiently forming a metal ball without heating the material, a metal ball manufacturing apparatus used therefor, and It is an object of the present invention to provide an anode copper ball for plating manufactured by this method for manufacturing a metal ball.

  In order to solve this problem, a metal ball manufacturing method according to the present invention is a method for manufacturing a metal ball that forms a ball material from a long material by cold rolling using at least one set of forming rolls. In the manufacturing method, the material is arranged so as to extend along an axis, and the set of forming rolls rotates around each rotation axis and along the outer peripheral surface of the material around the axis. The ball material is formed from the material by revolving.

  The metal ball manufacturing apparatus according to the present invention is a metal ball manufacturing apparatus that forms a ball material from a long material by cold rolling using at least one set of forming rolls, The set of forming rolls, a material support portion for supporting the material so as to extend along an axis, roll rotation driving means for rotating the set of forming rolls around respective rotation axes, and the set of sets Roll revolving drive means for revolving the forming roll around the axis.

  In the metal ball manufacturing method and metal ball manufacturing apparatus of this configuration, a set of forming rolls rotates around the respective rotation shafts and revolves along the outer peripheral surface of the material around the axis line. The ball material can be formed without rotating the material. Therefore, it is not necessary to cut the material short, and for example, a wire wound in a coil shape can be used as the material, and the ball material can be efficiently formed. In addition, since it is not necessary to cut the long material in advance, it is possible to reduce defective moldings occurring at the initial and final stages of molding.

In addition, since the material is rolled cold without heating, there is no problem of coarsening of crystal grains and generation of an oxide film.
Furthermore, since the ball material is formed by rolling, the contact area between the material and the roll is smaller than that of forging, and the power can be suppressed, and a metal ball with high sphericity can be formed.

In addition to forming a ball material from a material with a set of forming rolls, a set of forming rolls may be arranged in multiple stages, and the material may be sequentially supplied to these forming rolls to form the ball material. Good.
Alternatively, a ball material may be formed by forming a screw-shaped forming groove having a semicircular cross section on the outer peripheral surface of the pair of forming rolls, inclining the rotation axes of these rotations and revolving around the material. .

Here, the outer circumferential portion of the forming roll forms a concave groove that is recessed radially inward on the outer peripheral surface of the material, and the groove width of the concave groove is reduced while the forming roll is biting inward in the radial direction. The ball material may be formed by gradually narrowing and cutting the material.
In this case, a concave groove is formed in the outer peripheral surface of the material by revolving along the outer peripheral surface of the material while pressing the outer peripheral portion of the forming roll against the outer peripheral surface of the material. As the depth is increased, the groove end width is gradually narrowed and cut, so that the cut end face can be formed into a hemispherical shape. By repeating this, the ball material can be efficiently formed.

The forming roll may be a profile roll whose cross-sectional shape orthogonal to the circumferential direction changes along the circumferential direction.
In this case, by revolving a set of forming rolls along the outer peripheral surface of the material, the material can be made into a shape that sequentially matches the shape of the outer peripheral surface of the roll, and the ball can be formed smoothly.

Furthermore, you may form the 1 shaping | molding protrusion part which protrudes toward the radial direction outer side in the outer peripheral surface of the said forming roll.
In this case, since the material comes into contact with the forming roll at the front end face and both side faces of the single forming protrusion, the contact area is reduced, so that the power for driving the forming roll can be reduced. Thereby, the outer diameter of the metal ball which can be shape | molded can be enlarged.

Moreover, it is preferable to provide the metal ball manufacturing apparatus with supply means for intermittently supplying the material between the pair of forming rolls.
In this case, for example, since a long material wound in a coil shape can be sequentially supplied to a forming roll without cutting, a metal ball can be formed more efficiently.

The anode copper ball for plating according to the present invention is manufactured by the above-described method for manufacturing a metal ball.
Since the anode copper balls for plating are formed by cold rolling, the crystal grains are not coarsened and the generation of sludge can be suppressed. Furthermore, since no oxide film is formed on the surface, it is not necessary to perform surface treatment such as pickling.

  ADVANTAGE OF THE INVENTION According to this invention, the metal ball manufacturing method which can shape | mold a metal ball efficiently, without heating a raw material, the metal ball manufacturing apparatus used for this, and the plating manufactured by this metal ball manufacturing method An anode copper ball can be provided.

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 and 2 show a metal ball manufacturing apparatus according to the present invention. FIG. 3 shows a forming roll, and FIG. 4 shows an outline of the ball forming step.
The metal ball manufacturing apparatus 10 according to the present embodiment forms an anode copper ball for plating having a diameter of 8 to 24 mm.

This metal ball manufacturing apparatus 10 includes a support jig 11 and a pinch roll 12 as a material support portion for supporting a copper wire material S as a raw material so as to extend along an axis L, and ball forming for forming a metal ball B. Part 20.
The copper wire material S used as the raw material for the anode copper balls for plating is composed of, for example, low oxygen copper or phosphorus deoxidized copper having an oxygen content of 20 ppm or less, and is continuously manufactured by a belt caster type continuous casting machine. The produced ingot is rolled into a coil by a continuous rolling mill.

The pinch roll 12 supports the copper wire material S while inserting the long copper wire material S from one side (right side in FIG. 1) into the ball forming unit 20. Further, the support jig 11 is disposed on the other side (right side in FIG. 1) of the ball molding portion 20, and is formed in a concave curved surface shape in which a surface facing one side is recessed toward the other side. The support jig 11 is configured to be able to advance and retract in the direction of the axis L.
Further, an anti-swaying roll 13 for preventing the copper wire material S from shaking is provided on one side of the support jig 11.

The ball forming unit 20 includes a housing 21 and a cylindrical ring frame 22 that is accommodated in the housing 21 and extends along the axis L.
At least one set of forming rolls 30 is disposed on the inner peripheral surface of the ring frame 22. In this embodiment, as shown in FIGS. 1 and 2, the pair of forming rolls 30 face each other. It is arranged.

  These forming rolls 30 are supported by a bearing support portion 23 in which a support shaft portion 31 protruding from the side surface of the forming roll 30 protrudes radially inward from the inner peripheral surface of the cylindrical ring frame 22. It can be rotated around. These forming rolls 30 are arranged so that the respective rotation axes M are parallel to each other and parallel to the axis L, and are opposed to each other with the axis L interposed therebetween. Has been.

In addition, a rotation gear 32 having gear teeth formed on the outer peripheral surface is disposed at one end of the support shaft portion 31 of the forming roll 30.
A ring gear 24 having internal teeth on the inner peripheral surface is meshed with the rotary gear 32. A first drive gear 25A disposed on the power shaft of the first drive motor 25 is engaged with the inner teeth of the ring gear 24, and the ring gear 24 is connected to the axis L by the first drive motor 25. It is comprised so that it can be rotated as a center.
When the ring gear 24 is rotated by the first drive motor 25, the rotation gear 32 meshed with the ring gear 24 rotates, and the pair of forming rolls 30 can be rotated around the respective rotation axes M at the same time. That is, the first drive motor 25 and the ring gear 24 constitute a roll rotation drive means 26 that rotates the forming roll 30 around the respective rotation axes M.

Further, gear teeth are formed on the outer peripheral surface of the ring frame 22, and the second drive gear 27 </ b> A disposed on the power shaft of the second drive motor 27 is engaged. Thereby, the ring frame 22 can be rotated around the axis L by the second drive motor 27. Here, when the ring frame 22 rotates, the forming roll 30 supported by the bearing support portion 23 protruding from the inner peripheral surface of the ring frame 22 also revolves around the axis L. That is, the second drive motor 27 and the ring frame 22 constitute roll revolving drive means 28 for revolving the forming roll 30 around the axis L.
Here, the rotation speeds of the first drive motor 25 and the second drive motor 27 are adjusted so as not to generate torque that rotates the copper wire material S.

The forming roll 30 includes one forming protrusion 33 that protrudes radially outward and extends along the circumferential direction. As shown in FIG. 3, the protrusion height of the forming protrusion 33 is high. It is configured to gradually change in the circumferential direction. In the present embodiment, as shown in FIG. 4, the width of the molding ridge 33 also gradually changes in the circumferential direction so that the projection height of the molding ridge 33 becomes higher and the width becomes narrower. It is configured. Further, the side surface of the forming ridge 33 has a concave curve in the cross section orthogonal to the circumferential direction, and the highest protruding portion of the forming ridge 33 has a ¼ arc shape.
And in the part protruded most highly of the shaping | molding protrusion 33, it is comprised so that the shaping | molding protrusion 33 of a pair of forming rolls 30 and 30 may mutually contact.

Next, a process for forming the metal ball B in the ball forming unit 20 will be described. First, the copper wire material S whose other side end is formed into a hemispherical shape is inserted into the ball forming unit 20 by the pinch roll 12, and the other end of the copper wire material S is brought into contact with the support jig 11. Thereby, it arrange | positions so that the axis line of the copper wire raw material S may correspond to the axis line L. FIG.
Here, the roll 30 is revolved along the outer peripheral surface of the copper wire material S around the axis L while rotating the forming roll 30 around each rotation axis M.

  Then, the shaping | molding protrusion part 33 of the shaping | molding roll 30 is pressed on the outer peripheral surface of the copper wire raw material S, and the ditch | groove recessed toward the radial inside is formed in the outer peripheral surface of the copper wire raw material S. Since the protruding height of the forming protrusion 33 is gradually increased, the forming protrusion 33 bites into the outer peripheral surface of the copper wire material S and plastically deforms the copper wire material S. Here, since the width of the forming protrusion 33 becomes narrower as the protrusion height increases, and the side surface of the forming protrusion 33 has a concave curved surface, it is formed on the outer peripheral surface of the copper wire material S. The concave groove is deformed so that the width of the groove gradually becomes narrower as the groove depth becomes deeper, and has a shape that follows the concave curved surface formed by the side surface of the forming ridge 33.

  In the part where the protrusion height of the forming protrusion 33 becomes the highest, the forming protrusions 33 of the respective forming rolls 30 come into contact with each other, and the copper wire material S is cut. Since the cross section orthogonal to the circumferential direction of the side surface of the molding ridge 33 has a ¼ arc shape at the highest protruding portion of the molding ridge 33, the cut end surfaces of the copper wire material S are respectively It is formed in a hemispherical shape. In this way, the anode copper ball for plating (metal ball B) is formed. Thereafter, the support jig 11 is moved toward the other side, the metal ball B is discharged to the outside, and the support jig 11 is returned to a predetermined position.

  Then, the copper wire material S with the other side end formed into a hemispherical shape is fed toward the other side, inserted into the ball forming unit 20, and the other end of the copper wire material S is applied to the support jig 11. Make contact. By repeating this, the metal ball B is continuously formed from the long copper wire material S wound in a coil shape. In this ball molding, since the copper wire material S is deformed so as to rise in the radial direction, the outer diameter of the formed metal ball B becomes larger than the initial outer diameter of the copper wire material S.

FIG. 5 shows the positional relationship between the copper wire material S and the forming roll 30. When the revolution angle of the ring frame 22 is θ1, the non-slip position radius of the copper wire material S is r1, the rotation angle of the forming roll 30 is θ2, and the non-slip position radius of the forming roll 30 is r2, the forming roll 30 and the copper wire material Since it is in rolling contact with S, θ1 × r1 = θ2 × r2, and the revolution angle θ1 of the ring frame 22 is θ1 = (r2 / r1) × θ2.
In the present embodiment, since one metal ball B is formed when the forming roll 30 rotates once, one metal ball B is formed when the ring frame 22 rotates (r2 / r1).

  Here, the ratio of the radius r2 of the forming roll 30 and the radius r1 of the copper wire material S is normally set to about (r2 / r1) = 5 to 10 when the axial rigidity of the forming roll 30 is taken into consideration. From this, in this embodiment, the ring frame 22 rotates 5-10 centering on the axis L, and the one metal ball | bowl B is shape | molded. The radius ratio r2 / r1 can be appropriately set in consideration of the material of the metal ball to be molded, the ball radius, and the like.

In the metal ball manufacturing apparatus 10 having such a configuration, the pair of forming rolls 30 rotate around the respective rotation axes M and along the outer peripheral surface of the copper wire material S around the axis L. Since it is configured to revolve, the metal ball B can be formed by processing the outer peripheral surface of the copper wire material S without rotating the copper wire material S. For this reason, it is not necessary to cut the copper wire material S into short pieces in advance, and the metal balls B can be continuously formed from the long copper wire material S wound in a coil shape.
Moreover, in this embodiment, although hemispherical defective molding occurs at the initial stage and the final stage of molding, it is possible to insert the long copper wire material S into the ball molding unit 20 without cutting in advance. As a result, the amount of defective molding can be reduced.

  Further, the forming roll 30 is provided with a single forming protrusion 33 that protrudes radially outward and extends along the circumferential direction, and the protrusion height of the forming protrusion 33 gradually increases in the circumferential direction. The width of the molding ridge 33 is gradually changed in the circumferential direction so as to change, and the projection ridge 33 is configured such that the projection height of the molding ridge 33 becomes higher and the width becomes narrower. The metal ball B is formed by pressing the outer peripheral surfaces of the pair of forming rolls 30 against the copper wire material S and plastically deforming the side surfaces thereof in a cross section perpendicular to the circumferential direction. Can do.

  Furthermore, since the forming roll 30 is provided with one forming protrusion 33, the copper wire material S comes into contact with the forming roll 30 on the tip surface and both side surfaces of the forming protrusion 33. The contact area can be reduced. Thereby, the output of the 1st drive motor 25 which drives the forming roll 30, and the 2nd drive motor 27 can be made small, and it becomes possible to shape | mold the comparatively large diameter metal ball B. FIG.

Moreover, since the pinch roll 12 that supports the copper wire material S acts as a supply means for intermittently supplying the copper wire material S to the ball forming unit 20, the copper wire material S can be sequentially supplied to the forming roll 30. The metal ball B can be molded well.
Furthermore, in this embodiment, since the support jig 11 that supports the other end of the copper wire material S is provided, the position of the copper wire material S in the direction of the axis L is stable, and a metal ball having a high sphericity. B can be molded. In addition, since the steady roll 13 for preventing the copper wire material S from shaking is disposed, the metal ball B can be formed with higher accuracy.

  Furthermore, the anode copper ball for plating formed by the metal ball manufacturing apparatus 10 is rolled in the cold without heating the copper wire material S, so that the crystal grains are not coarsened and sludge is produced. Can be suppressed. Furthermore, since no oxide film is formed on the surface, it is not necessary to perform surface treatment such as pickling.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
For example, the forming roll is provided with one forming protrusion, and the protrusion height of the forming protrusion is described as gradually changing over the circumference in the circumferential direction, but is not limited thereto. As shown in FIG. 6, you may form so that two shaping | molding protrusions may be longitudinally arranged in the circumferential direction. In this case, one metal ball is formed each time the forming roll is rotated halfway around the rotation axis M.

Moreover, although demonstrated as what shape | molds the anode copper ball for plating from a copper wire raw material, it is not limited to this, It can apply also to shaping | molding of another metal ball.
Further, although it has been described that the anode copper ball for plating having a diameter of 8 to 24 mm is formed, it is preferable to change the ball diameter according to the material of the metal ball.

Moreover, although demonstrated as what was provided with a pair of forming roll, it is not limited to this, A forming roll may be arrange | positioned in multiple steps and a raw material may be supplied to these forming rolls one by one.
Moreover, it is good also as a structure which forms the screw-shaped shaping | molding groove | channel which makes a cross-sectional semicircle in the outer peripheral surface of a pair of shaping | molding roll, inclines the rotating shaft of these rotations mutually, and revolves around the raw material.

  In addition, although the copper wire material has been described as being manufactured by a belt caster type continuous casting machine and a continuous rolling mill, it may be manufactured by other methods, for example, by extruding a billet material at a high temperature. The copper wire material may be manufactured.

1 is a schematic side view of a metal ball manufacturing apparatus according to an embodiment of the present invention. It is the schematic of the cross section orthogonal to the axis line of the manufacturing apparatus of the metal ball | bowl shown in FIG. It is explanatory drawing of the forming roll with which the manufacturing apparatus of the metal ball shown in FIG. 1 was equipped. It is process drawing which shows a mode that a metal ball is shape | molded with the manufacturing apparatus of the metal ball shown in FIG. It is explanatory drawing which shows the contact state of a forming roll and a raw material. It is explanatory drawing which shows the other example of a forming roll.

Explanation of symbols

10 Metal Ball Manufacturing Equipment 11 Support Jig (Material Support Section)
12 Pinch roll (material support / feeding means)
26 Roll rotation driving means 28 Roll revolution driving means 30 Forming roll 33 Forming protrusion

Claims (7)

By cold rolling using at least one set of forming rolls, a metal ball manufacturing method for forming a ball material from a long material,
The material is arranged so as to extend along an axis;
The set of forming rolls rotates around each rotation axis and revolves along the outer peripheral surface of the material around the axis,
A method of manufacturing a metal ball, comprising forming a ball material from the material.   The outer periphery of the forming roll forms a concave groove that is recessed radially inward on the outer peripheral surface of the material, and the groove width of the concave groove is gradually narrowed while the forming roll is biting inward in the radial direction. The metal ball manufacturing method according to claim 1, wherein the ball material is formed by cutting the material. A metal ball manufacturing apparatus for forming a ball material from a long material by cold rolling using at least one set of forming rolls,
The set of forming rolls;
A material support for supporting the material so as to extend along the axis;
Roll rotation driving means for rotating the set of forming rolls around the respective rotation axes;
Roll revolving drive means for revolving the set of forming rolls about the axis;
An apparatus for producing a metal ball, comprising:   The said forming roll is a profile roll from which the cross-sectional shape orthogonal to a circumferential direction changes along a circumferential direction, The manufacturing apparatus of the metal ball | bowl of Claim 3 characterized by the above-mentioned.   5. The metal ball manufacturing apparatus according to claim 3, wherein one forming protrusion that protrudes radially outward is formed on an outer peripheral surface of the forming roll.   The metal ball manufacturing apparatus according to any one of claims 3 to 5, further comprising supply means for intermittently supplying the material between the pair of forming rolls.   An anode copper ball for plating produced by the method for producing a metal ball according to claim 1 or 2.

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