JPH0818148B2 - Method and apparatus for manufacturing spot-shaped partial clad material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention is a method of spot-clad a metal foil on a band-shaped material, and is used for manufacturing a lead frame or the like of an integrated circuit. The present invention relates to a method and an apparatus for manufacturing a spot-shaped partial clad material.

[Prior Art] As shown in FIG. 9, a lead frame 1 of an integrated circuit.
Is formed by pressing a band-shaped material W. The portion of the lead frame 1 where the bonding portion 1a is formed is coated with a metal such as Al or Ag to improve the bondability. I need to put it. For this reason, the strip-shaped material W should have Al, Ag and
A metal foil S such as is clad. This material is referred to as a spot-shaped partial clad material, and as a method for forming this composite material, there have been conventionally known the "vapor deposition method", the "plating method", and the "rolling pressure welding method".

[Problems to be Solved by the Invention] However, the "vapor deposition method" requires not only expensive equipment but also masks unnecessary portions to be deposited during vapor deposition, and the vapor deposition requires a relatively long time. Therefore, there is a problem that productivity is low.

With regard to the "plating method", there is a problem in that it is not versatile because there are some that cannot be plated depending on the type of the metal to be clad and the thickness that can be plated efficiently is limited.

"Rolling pressure welding method" is, for example, as shown in Japanese Patent Laid-Open No. 59-1078, in which a striped Al or Ag foil is provided on a lead frame strip material, and then a predetermined spot shape is formed. A method of mechanically or chemically removing unnecessary portions. This method has a problem in that the yield of the metal to be deposited is poor, and a facility for masking the portion to be deposited to remove the unnecessary portion is required, resulting in high production cost.

Further, there is proposed a lead frame in which an Al foil is fastened to a lead frame material by spot welding and then clad is formed (JP-A-60-227456), but a metal foil is formed at a predetermined pitch. A specific manufacturing method for aligning with high accuracy and temporarily temporarily fixing has not been proposed, and it has not been put to practical use at this point. That is, it is possible to produce a spot-shaped partial clad material of a fixed length by superposing a metal foil piece of a predetermined size on a predetermined position of a plate material of a fixed length, and press-contacting and rolling it into a continuous strip-shaped material. On the other hand, it was not possible to mass-produce industrially because there is no concrete method to carry out continuously.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a method for producing a spot-shaped partial clad material and an apparatus for the same, which are capable of mass-producing a highly accurate spot-shaped partial clad material by stacking a metal foil having a predetermined size on a strip-shaped material at a constant pitch.

[Means for Solving the Problems] In order to achieve the above object, the method of the present invention is a method of forming a clad material in which a metal foil is clad in a spot shape on a strip-shaped material, and the material is placed at working positions at regular intervals. Material feeding step, feeding the strip-shaped metal foil with a moving suction member and feeding it to the working position, and sucking the metal foil again with a fixed suction member to fix it on the material surface. A foil positioning step of positioning to a position, a cutting step of cutting the metal foil into a predetermined size, a temporary fixing step of temporarily fixing the metal foil piece on the material, the temporarily fixed metal foil piece and the material. And a rolling step of pressing and rolling.

Further, the device of the present invention includes a material supply device for supplying a band-shaped material, a material feeding device for conveying the material drawn from the material supply device by a constant length, and a metal foil supply device for supplying a band-shaped metal foil. And a metal foil feeding device that conveys the metal foil drawn from this metal foil supply device by a fixed length, and cut the conveyed metal foil and place it on the upper surface of the material, and also place this metal foil piece on the upper surface of the material. Cutting to temporarily fix
The structure includes a temporary fixing device and a rolling device that press-contacts and rolls the temporarily fixed metal foil piece and the material.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

First, regarding the spot-shaped partial clad material manufacturing device,
A description will be given with reference to FIGS. 1 to 8.

FIG. 1 is an overall configuration diagram of a spot-shaped partial clad material manufacturing apparatus, FIG. 2 is an external perspective view of a metal foil feeding apparatus in the apparatus, FIG. 3 is a plan view of the same, and FIG. 4 is a line AA of FIG. Cross-sectional view, Fig. 5 is a partially cutaway side view of the cutting / temporary fixing device,
6 is a sectional view taken along the line BB in FIG. 5, FIG. 7 is a sectional view taken along the line CC in FIG. 5, and FIG. 8 is a side sectional view showing the electrode portion of the same device in an enlarged manner.

As shown in FIG. 1, the spot-shaped partial clad material manufacturing apparatus is equipped with the material supply device 100 and the metal foil supply device 200 on the material supply side of the cutting / temporary fixing device 500. The material feeding device 300 and the metal foil feeding device 400 provided in the above are adapted to lead out the material W and the metal foil S from the respective feeding devices 100 and 200. A material cleaner 600 cleans the upper surface of the material W supplied to the cutting / temporary fixing device 500 with a rotating brush and sucks it in vacuum. A pressure welding / rolling device 700 is provided on the delivery side of the cutting / temporary fixing device 500.
The clad material that has passed 00 is wound up by the winding device 800 as a product.

The material supply device 100 includes a detachable drum 101 around which a belt-shaped material W is wound, and the material W is led out by the rotation of the drum 101. On the other hand, the metal foil supply device 200 includes a detachable drum 201 around which a strip-shaped metal foil S is wound, and the metal foil S is led out by rotating the drum 201. Here, as the material W and the metal foil S, any materials are used depending on the use of the clad material to be manufactured. For example, for a lead frame of an integrated circuit, Fe-Ni material is suitable as a material, and Al, Ag material is suitable as a metal foil.

As the material feeding device 300, for example, a known air feeder is used. The material W drawn from the material supply device 100 by the material feeding device 300 is a cutting / temporary fixing device 5
It is supplied to 00 at a constant pitch intermittently.

As shown in FIGS. 2 and 3, the metal foil feeding device 400 includes a metal foil guide plate (fixed suction member) 402 on a base 401, and a slider (moving suction member) 403 above the metal foil guide plate 402.
It has.

On the upper surface of the metal foil guide plate 402, a step portion 4 extending in the front-rear direction is formed.
04 is formed, and the lower surface side of this step portion 404 is the metal foil S.
Of the guide groove 405. Further, a groove width adjusting plate 406 is provided on the opposite side of the step portion 404 with the guide groove 405 interposed therebetween so as to be movable in the groove width direction. That is, the slot 4 is formed in the groove width adjusting plate 406.
07 is drilled in multiple places and screws 4 that engage with the long hole 407
It is fixed on the metal foil guide plate 402 by 08. Therefore, the groove width adjusting plate 406 can be moved and adjusted in the groove width direction according to the width dimension of the supplied metal foil S.

A fixed suction portion 409 is formed at the front end of the bottom surface of the guide groove 405, as shown in FIG. Fixed suction part 409
Is composed of a large number of small holes 409a and is connected to a vacuum suction device (not shown) via a suction hole 410 and a pipe (not shown). Here, since the suction pressure by the vacuum suction device is dispersed into the large number of small holes 409a, the metal foil S is soft and surely sucked, and there is no risk of damage or bending.

2 and 3, an air cylinder 411 is provided on one side surface of the base 401 and drives the drive rod 411a in the feeding direction (right direction in FIG. 3). Slider 403
Is attached to the tip of the drive rod 411a of the air cylinder 411 via a connector 412. Also, the slider 403
Is urged to the left in FIG. 3 by a tension spring 413. Therefore, the slider 403 moves in the feeding direction by the driving force of the air cylinder 411 and retracts by the biasing force of the tension spring 413. 414 is a stopper provided on the upper surface of the metal foil guide plate 402, and has a pin 414a that abuts the slider 403 in the retracted position. This pin 414a is connected to the micrometer 41
Since the protruding length changes in the front-back direction by 5, the feed pitch of the slider 403 can be adjusted with high accuracy.

On the lower surface of the slider 403, a moving suction portion 416 is formed as shown in FIGS. That is, a disc 417 for adjusting the suction position is rotatably attached to the lower surface of the slider 403. A through hole 418 is formed in the disc 417 at a position eccentric to the rotation center by a predetermined length. Then, a suction nozzle 419 including a large number of fine holes 419a is attached to the lower surface of the disc 417 so as to communicate with the through hole 418. On the other hand, a communication hole 420 communicating with the through hole 418 is formed on the lower surface of the slider 403 with which the disc 417 is in contact. The communication hole 420 communicates with a vacuum suction device (not shown) via a pipe 421.

With the above configuration, by rotating the disc 417,
Since the opening position of the suction nozzle 419 can be adjusted, the metal foil S
Even if the width of the metal foil S is changed, the metal foil S can always be surely adsorbed on the central axis line. Further, since the suction pressure of the suction nozzle 419 is dispersed in the large number of pores 419a, the metal foil S can be softly and surely sucked.

Further, in the base 401, a material guide passage for guiding the material W along the lower side of the metal foil S (not shown in the drawing).
Is formed. Furthermore, the metal foil guide plate 402 is movable in the width direction of the material W with respect to the base 401. This movement adjustment is performed by the micrometer 422. Accordingly, the relative position of the metal foil S with respect to the material W can be adjusted with high accuracy.

The cutting / temporary fixing device 500, as shown in FIG.
The mold 501 is composed of 10 and the lower mold 520.

The lower die 520 has a structure in which a die holder 522 is arranged on the upper surface of a lower die stand 521, an electrode block 523 is incorporated inside the die holder 522, and a die 504 is installed on the upper surface of the die holder 522.

The electrode block 523, as shown enlarged in FIG.
It is divided into two along the feeding direction of the metal foil S (material W). The block pieces 524, 525 are symmetrically arranged, and form a groove portion 523a in the center and bearing portions 524a, 525a on both sides. The main shafts 526 and 527 are rotatably supported by the bearing portions 524a and 525a, respectively. Rotating electrodes 528, 529 and rotating electrode receivers 530, 531 are fitted into the tip ends of the main shafts 526, 527, respectively. The rotating electrode receivers 530 and 531 are fixed to the spindles 526 and 527 by screws 532 and 532, respectively, and the rotating electrodes 528 and 529 are bolted.
Since it is fastened to the rotary electrode receivers 530 and 531 by 533 and 533, it does not separate from the main shafts 526 and 527. Insulating spacers 534 and 535 are interposed between the rotary electrode receivers 530 and 531 and the bearing portions 524a and 525a.

Further, the rotating electrodes 528, 529 are composed of two electrode supporting members 536, 5
36 (only one is shown in FIG. 8). These electrode supporting members 536, 536 are formed of a material having high flexibility and insulation, such as urethane resin. Furthermore, power cords 538 and 539 are connected to the rotary electrodes 528 and 529, respectively. The power cords 538 and 539 are led out of the machine through the hollow portion of the main shaft 527 and are connected to a power source (not shown).

The electrode block 523 incorporating the rotary electrodes 528, 529 and the like as described above is mounted in the die holder 522 as shown in FIG. The one main shaft 527 is connected to a rotary drive source (not shown) via a shaft coupling 540. The rotary drive source rotates the main shaft 527 at a constant speed and reverses the rotation direction at an arbitrary angle, for example, every 180 degrees. The rotational force of the main shaft 527 is transmitted to the other main shaft 526 via the electrode supporting members 536 and 536. . Therefore, the rotating electrodes 528, 529 are
Rotates with 6,527. As a result, the wear of the outer circumferences of the rotating electrodes 528, 529 due to the discharge becomes uniform, and the life is extended. Further, since the power cords 538 and 539 passed through the main shaft 527 are not twisted because they are reversed at every arbitrary angle.

The electrode block pieces 524 and 525 are separately biased upward by hydraulic cylinders 541 and 542 provided in the lower mold base 521.

A metal foil guide groove 504a is formed at the center of the die 504 installed on the upper surface of the die holder 522, and the metal foil s is supplied to this guide groove 504a. On the other hand, a material guide hole 504b is formed in the lower part of the die 504, and the material W is supplied above the rotary electrodes 528 and 529 through the material guide hole 504b.

A punch holder 512 is supported on the upper die 510 by a guide post 511 so as to be vertically movable, and a punch 513 is provided on the punch holder 512. The punch 513 cooperates with the die 504 to cut the metal foil S. Where punch 513 and dice 5
The cutting edges of 04 intersect at a slight relative angle (for example, 1 degree) when viewed from a plane, and during the cutting operation, the punch 513 and the die 504 are sequentially moved from one end of the cutting edge toward the other end. It is designed to engage. Also, when viewed from the front, a slight relative angle (for example, 1 degree) is attached.
As a result, the punch 513 and the die 504 perform a cutting operation as if cutting the paper with scissors, so that the thin metal foil can be reliably cut. In order to realize the above cutting operation reasonably, the die 504 is provided with a compression spring 51 as shown in FIG.
It is fixed by the biasing force of 4,514, and the punch 513 can move in parallel against this biasing force during the cutting operation.

Further, a pressing member 515 is provided at the rear position of the punch 513 (see FIG. 7). This holding member 515 is a die 504
Is positioned above the guide groove 504a of the punch 513, the lower end thereof projects slightly below the cutting edge of the punch 513, and the spring 516
It is supported by and can move up and down. The pressing member 515 descends together with the punch 513 and presses and fixes the metal foil S in the guide groove 504a before the cutting operation starts. Therefore, the metal foil S is accurately cut according to the dimensions in a state where the bending and the distortion are removed, and is accurately arranged at a predetermined position of the material W. Further, an upper die electrode 517 is provided at a position slightly ahead of the cutting edge of the punch 513 (see FIG. 7).
The upper die electrode 517 is located above the rotating electrodes 528 and 529 described above and descends together with the punch holder 512. And
By pressing the metal foil S and the material W from above, the rotary electrode 528,
Press on 529. In this way, the upper electrode 517 and the rotating electrode 52
The metal foil S and the material W are sandwiched by 8,529 and electricity is applied to perform spot welding.

As shown in FIG. 1, a pressure welding / rolling apparatus 700 includes a calendar roller 701 and a backup roller 702, and a raw material W having a metal foil S temporarily fixed thereto is passed between the calender rollers 701 to perform pressure welding / rolling. Stick the metal foil S on.
The load for pressure contact / rolling is transmitted from the backup roller 702 to the calendar roller 701. This load can be adjusted arbitrarily.

The winding device 800 winds the pressed and rolled clad material (product) onto the drum 801. A tension device 802 is provided in front of the drum 801, and the product is wound while applying a constant tension to the product. Further, the winding device 800 includes a separator coiler 803 wound with a scratch-proof tape.
The damage prevention tape is pulled out from the coiler 803, supplied to the surface of the product, and wound with the product to prevent the product from being damaged.

Next, an example of the method of the present invention using the above-described spot-shaped partial clad material manufacturing apparatus will be described.

The method of the present invention is composed of a material feeding step, a foil feeding step, a foil positioning step, a cutting step, a temporary fixing step, and a rolling step.

(1) Material Feeding Device The strip-shaped material W attached to the material feeding device 100 is pulled out from the tip, and the material guiding passage of the metal foil feeding device 400, the material guiding hole 504b of the cutting / temporary fixing device 500, and the rotation. It is guided to the material feeding device 300 through the electrodes 528 and 529. The material feeding device 300 intermittently transfers the material W to the right in FIG. 1 by a fixed length. By this operation, the material W
Are sequentially sent to the positions (working positions) above the rotary electrodes 528, 529 of the temporary cutting fixing device 500.

(2) Foil feeding step and foil positioning step The strip-shaped metal foil S mounted on the metal foil supply device 200 is
It is pulled out from the tip and guided to the guide groove 405 of the metal foil feeding device 400. In the metal foil feeding device 400, the slider 403 sucks the metal foil S at the retracted position by the moving suction unit 416 and moves it forward by driving the air cylinder 411. By this operation, the metal foil S is fed by a fixed length (foil feeding step).
At this time, the fixed suction portion 409 provided on the guide groove 405 surface of the metal foil guide plate 402 is not performing the suction operation.

The slider 403 releases the suction state of the moving suction portion 416 at the front end position. At the same time, the suction operation of the fixed suction unit 409 is started, and the metal foil S is sucked and fixed by the fixed suction unit 409 (foil positioning step).

The slider 403 transfers the metal foil S to the fixed suction portion 409, and then moves to the retracted position again. By repeating a series of these operations, the tip of the metal foil S passes through the guide groove 504a of the die 504 provided in the cutting / temporary fixing device 500 and extends from the cutting edge of the die 504 by a certain length to form a rotary electrode. 528,5
It is located above 29 (working position). The foil feeding step and the foil positioning step are performed in parallel with the material feeding step described above.

(3) Cutting Process After the metal foil S is placed at the work position, the upper die 510 descends to perform the cutting work. That is, together with the punch holder 512, the pressing member 515, the punch 513, and the upper electrode 517.
And the pressing member 515 presses the metal foil S against the surface of the guide groove 504a of the die 504. Then, the punch 513 engages with the die 504 to cut the metal foil S. The cut metal foil piece S is arranged on the upper surface of the material W at the working position.

(4) Temporary fixing process The upper electrode 517 is further lowered together with the punch 513, and the metal foil piece S and the material W at the working position are rotated electrodes 528, 529.
Press to the side. The metal foil piece S and the material W are the upper electrode 51.
An appropriate pressure is achieved by the balance between the pressure applied to the cylinders 541, 542 sandwiched between the 7 and the rotating electrodes 528, 529 and the pressing force of the upper mold electrode 517. When a high voltage is applied between the rotating electrodes 528, 529 while applying a constant pressure, a current flows between the upper mold electrode 517 and the rotating electrodes 528, 529,
Heating occurs due to resistance between the metal foil piece S and the material W, and as a result, the metal foil piece S is spot-welded on the material W.

(5) Rolling Step The material W to which the metal foil pieces S have been temporarily fixed is sequentially sent from the cutting / temporary fixing device 500 to the pressure welding / rolling device 700. In the pressure welding / rolling apparatus 700, the temporarily fixed material W of the metal foil piece S is
Is pressed between the calendar rollers 701 and 701 and rolled.
Here, the material W is stretched to remove undulations and the like.
The metal foil piece S is pressed against the upper surface of the material W and integrated with the material W. The material W having the metal foil pieces S clad after the rolling process is wound up by the winding device 800.

The above-mentioned steps are continuously performed at a constant pitch,
Metal foil pieces S are clad on the upper surface of the material W at predetermined intervals.

The present invention is not limited to the above-described embodiments, and various modifications can be made without changing the gist.

For example, the material supply device in the spot-shaped partial clad material manufacturing device may be any device that can continuously supply a strip-shaped material, and the material supply device can supply the material in predetermined lengths. It suffices that the metal foil supply device is capable of continuously supplying a thin strip-shaped material. As the pressing / rolling device, various known devices for rolling a metal strip can be used. Further, it is not necessary to continuously shift to the rolling process after the temporary fixing process is completed, and the raw material after the temporary fixing process may be wound up and then rolled back to be rolled again. The winding device is not essential to the device of the present invention, and for example, the clad material may be transferred from the pressure welding / rolling device to the device for the next step as it is.

[Effects of the Invention] As described above, according to the method for manufacturing a spot-shaped partial clad material of the present invention, a highly precise spot-shaped partial clad material is obtained by superposing a metal foil having a predetermined size on a strip-shaped material at a constant pitch. Can be mass-produced.

Further, according to the spot-shaped partial clad material manufacturing apparatus of the present invention, the above manufacturing method can be efficiently carried out.

[Brief description of drawings]

1 to 8 are views for explaining an embodiment of the device of the present invention. FIG. 1 is an overall configuration diagram of a spot-shaped partial clad material manufacturing device, and FIG. 2 is a metal foil feeding device in the device. External perspective view, FIG. 3 is a plan view of the same, and FIG. 4 is A- of FIG.
A sectional view taken along the line A, FIG. 5 is a partially cutaway side view of the cutting / temporary fastening device, FIG. 6 is a sectional view taken along the line BB of FIG. 5, and FIG. 7 is a sectional view of FIG.
-C sectional view taken on the line C, and Fig. 8 is an enlarged side sectional view showing an electrode portion of the device. FIG. 9 is a view showing the process of manufacturing the lead frame of the integrated circuit on the plane of the material. W: Material, S: Metal foil 100: Material, 200: Metal foil feeder 300: Material feeder, 400: Metal foil feeder 500: Cutting / temporary fixing device 600: Material cleaner, 700: Pressure welding / rolling device 800: Winding device

Front page continued (72) Inventor Akira Sasaki 6-12 Hommachi, Tanashi City, Tokyo Citizen Watch Co., Ltd. Tanashi Factory (72) Inventor Shin Nemoto 2-19-1 Minami Suita, Suita City, Osaka Prefecture Sumitomo Special Metal Co., Ltd. in Suita Works (72) Inventor Kazuhiro Yamamoto 2-19-1 Minami Suita, Suita City, Osaka Sumitomo Special Metals Co., Ltd. in Suita Works (56) Reference JP-A-2-280981 (JP, A) JP 62-156089 (JP, A) JP 61-276784 (JP, A) JP 59-21487 (JP, A) JP 3-106578 (JP, A)

Claims (2)

[Claims] 1. A method of forming a clad material in which a metal foil is clad in a spot shape on a band-shaped material, the material feeding step of feeding the material to a work position by a fixed length, and a moving suction member for moving the band-shaped metal foil. And a foil feeding step of feeding the metal foil to the working position, a foil positioning step of re-sucking the metal foil with a fixed suction member and positioning it at a fixed position on the material surface, and setting the metal foil to a predetermined size. It includes a cutting step of cutting into metal foil pieces, a temporary fixing step of temporarily fixing the metal foil pieces on the material, and a rolling step of press-contacting and rolling the temporarily fixed metal foil pieces and the material. A method for manufacturing a spot-shaped partial clad material, comprising: 2. A material supply device for supplying a belt-shaped material, a material feeding device for conveying the material drawn from the material supply device by a constant length, and a metal foil supply device for supplying a belt-shaped metal foil. A metal foil feeding device that conveys the metal foil drawn from this metal foil supply device by a fixed length, and cuts the conveyed metal foil into metal foil pieces that are placed on the upper surface of the material, and the metal foil is placed on the upper surface of the material. An apparatus for producing a spot-shaped partial clad material, comprising: a cutting / temporary fixing device for temporarily fixing a foil piece; and a rolling device for pressing and rolling the temporarily fixed metal foil piece and the material.