JPH04253527A - Method for working band material - Google Patents

Abstract

PURPOSE:To surely and easily correct the cumulative errors generated between the metallic foil and the reference hole by correcting the error of the reference hole by inserting the correcting pin in the reference hole before hole repunching, and inserting the guide pin in the re-punched reference hole. CONSTITUTION:The hole punching is executed by lowering the upper die 10 on the lower die, the reference hole is formed on the clad material 1. At first, the pin 12 for correcting is inserted in the reference hole before re-punching, and deviation error of the reference hole is corrected mechanically. The upper die is lowered further, many reference holes which are re-punched completely are inserted with the guide pins 131-13x, it is positioned, the cumulative error of the deviation difference, etc., of the original dimension and the measured dimension is absorbed. Further, the upper die 10 is lowered, the above corrected reference holes are re-punched with the punch 11 for re-punching, the reference holes are formed. Therefore, the cumulative error of the pitch between the metallic foil and the standard holes can be absorbed within the same as the pitch precision between the metallic foils, without measuring the pitches of the metallic foils and the reference holes.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for processing a strip material on which a metal foil or other processing member has been formed in advance, and in particular,
The present invention relates to a method for processing a strip material, in which, when drilling reference holes that will serve as reference positions in a subsequent process at a predetermined pitch from a workpiece, the reference holes are drilled while correcting the pitch error.

0002

[Prior Art] Reference holes in a strip material are holes that are formed in the strip material at predetermined intervals, and are used as a reference for processing when the strip material is subsequently processed. . It is desirable that the distance between the reference holes is maintained at a constant value as accurately as possible. The conventional method of adjusting the position of the reference hole that has been commonly used when processing strip material is to intermittently feed the strip material at predetermined intervals into a mold equipped with a hole punch and positioning pin, and punch the hole. The punch and positioning pins were operated repeatedly at precise timing to match the movement of the strip.

0003

According to the above-mentioned conventional reference hole position adjustment method performed when processing a strip material, it is possible to adjust the reference hole position by accurately adjusting the feeding timing of the strip material and the operation timing of the punch. It is possible to adjust the mutual spacing to a desired value with high precision, that is, to perform accurate positioning. However, such accurate positioning is relative to the reference holes, and if the strip is pre-formed with metal foil or other workpiece before drilling the reference holes, a constant pitch feed is required. It is extremely difficult to always accurately maintain the positional relationship between the metal foil and the reference hole at a constant value using only the method of forming the reference hole. For example, if the strip material is a clad material, after temporarily fixing a piece of metal foil to the material, reference holes (guide holes) are provided at a predetermined pitch with the piece of metal foil, and then the required dimensions are determined by subsequent pressure welding and rolling. The reference hole that has become blank is re-drilled in the required size and shape using a press mold to create a reference hole. Although it is possible to obtain a clad material with highly accurate pitch and dimensions using the above method, for example, there may be a difference in manufacturing accuracy between the manufacturing drawing and the mold (for example, about ±1 μm), or a difference in processing accuracy between the original size and the measured size (
For example, there is a difference of about ±1 μm), and the pitch error between metal foil pieces and between the metal foil pieces and the reference hole cannot be completely eliminated due to the cumulative pitch error that occurs during cladding, the cumulative error for the guide hole that occurs during pressing, etc. Even if the error is extremely small, the cumulative error becomes a problem because the object is a long object wound around a coil.

The present invention has been made in view of the above-mentioned circumstances when processing a strip material, and when drilling reference holes in a strip material on which a processing member has been previously formed, not only between the reference holes but also between the strip material. To provide a method for processing a strip material by which the mutual positional relationship between a processing member and a reference hole previously formed on the material can be accurately determined, and the reference hole can also be processed at the same time.

In particular, in the processing method for obtaining a cladding material having metal foil pieces on a strip material, holes are formed during the temporary fixing step,
When a reference hole that has reached the required dimensions through rolling is re-drilled to the required size and shape using a press mold to become a reference hole, it is necessary to ensure that the accumulated errors between the metal foil piece and the reference hole are corrected. The purpose is to provide a processing method that is easy to perform.

[0006] Furthermore, Japanese Patent Laid-Open No. 60-227456 discloses a technique of using guide holes when processing a lead frame. However, this conventional technology does not include a technology that allows for accurate positioning of the mutual positional relationship between the workpiece and the reference hole, which are preformed on the strip material, and for machining the reference hole at the same time. No disclosures.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the method of processing a strip material according to the present invention, in which reference holes are drilled while performing alignment, includes a correction pin, a punch for drilling, and a guide pin from the upstream side. The lengths of these pins and punches are as follows: drilling punch < guide pin < correction pin, and the maximum length of the pin and punch in the strip material feeding direction is as follows: drilling punch > guide pin > correction pin. Using a related press mold, while lowering the press mold, first insert a correction pin into the reference hole before re-drilling, mechanically correct the deviation error of the reference hole, and then re-drill. A guide pin is inserted into the drilled reference hole for positioning, and then a punch is used to re-drill the reference hole that was corrected during the previous press.

[0008]

[Function] According to the method for processing a band material of the present invention having the above-mentioned configuration, in order to provide reference holes that will serve as reference positions in the subsequent process at a predetermined pitch with respect to the workpiece, the holes are drilled during the temporary fixing process of the workpiece. When the reference holes that have reached the required dimensions through subsequent rolling are re-drilled into the required dimensions and shape using a press die, the cumulative error in the pitch between the workpiece reference holes is equal to the pitch accuracy of the metal foil piece, i.e. It is absorbed within the required tolerance of the processing area in the subsequent process.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a sectional view of essential parts of an example of an apparatus for carrying out the method of the present invention. Figure 2 shows the cladding material as a strip material, of which Figure 2(a) shows the state after temporary fixing of metal foil, Figure 2(b) shows the state after rolling, and Figure 2(c) shows the state after punching. This shows the state in which the reference hole has been drilled. As shown in FIG. 1, the press mold is comprised of an upper mold 10 that is movable up and down, and a lower mold 20 paired with the upper mold 10. The upper mold 10 has a substantially square reference hole 5 and a circular reference hole 6.
The punch 11 for re-drilling the hole is attached to the upper mold reference surface 1.
It is set so that it appears from 0a. The vertical movement of the upper die and the retraction of the punch 11 from the reference surface 10a are performed by driving means (not shown). Also, upper mold 1
A correction pin 12 that can be inserted into the reference hole 5 before re-drilling is provided on the upstream side of the perforating punch 11 on the reference surface 10a of 0. A plurality of (x) guide pins (131 to 13x) that can be inserted into a large number of completed reference holes 6 are erected at a predetermined pitch. The relationship between the hole punch 11, the correction pin 12, and the guide pin 13 provided on the upper die 10 is as follows. In other words, the length from the reference plane (when the re-drilling punch is protruded) is: Drilling punch 11<Guide pin 13<Correction pin 12The maximum length in the strip material feeding direction is:Drilling punch 11>Guide pin 13 >Correction pin 12.

Normally, the punch 11 for drilling is formed into a circular or cylindrical shape with a circular cross section in order to re-drill the circular reference hole 6 as described above. Also,
The shape of the guide pin 13 inserted into the re-drilled reference hole 6 is similarly formed into a circular shape with a circular cross-sectional shape, or a cylindrical shape. However, the shape of the correction pin 12 is determined by the shape of the reference hole 5 after rolling. That is, as shown in FIG. 2(b), when the reference hole 5 is square, it is possible to use a circular correction pin 12 having a cross section similar to the circle inscribed in the reference hole 5. but,
For example, in the case of a rectangular reference hole 5 having a long side in the strip feeding direction (longitudinal direction), the diameter of the correction pin 12 depends on the short side of the reference hole 5 (length in the direction perpendicular to the strip feeding direction). This makes it difficult to provide an appropriate amount of backlash that can absorb the various accumulated errors that characterize the present invention. Therefore, in such a case, the shape of the correction pin 12 is different from that of the reference hole 5.
It is preferable to form it into the shape of a square column or a square tube having a rectangular cross section similar to the above. Furthermore, in the case of a rectangular reference hole 5 having a short side in the strip feed direction, even if the correction pin 12 has a circular cross section, the diameter of the reference hole 5 is the same as that of the long side of the reference hole 5 (in the direction perpendicular to the strip feed direction). It is possible to use the correcting pin 12 because it is not restricted by the size (dimensions of

As described above, it is necessary to appropriately select the shape of the correction pin 12 such as a rectangular or circular cross section depending on the shape of the reference hole 5 after rolling. The maximum length of the pin 12 in the strip material feeding direction (in the case of a rectangular cross section, the length of one side in the strip material feeding direction,
If the cross section is circular, the diameter) is the reference hole 5 before re-drilling.
It is necessary to make the length shorter than the maximum length in the strip material feeding direction, and to make it slightly shorter than the tolerance range of the bonding area of the lead frame in the subsequent process.

The guide pins (131 to 13x) have a smaller diameter than the diameter of the reference hole 6, and are provided with enough backlash to absorb cumulative errors such as differences between the original size and the measured size.

As is clear from the above explanation, the maximum length of the various pins and punches in the strip material feeding direction is the maximum length of the reference hole 5 before re-drilling and the reference hole 6 during (after) re-drilling in the strip material feeding direction. Determined by maximum length.

[0014] Here, a clad material will be explained as an example of a strip material to be processed. The material that becomes the clad base material is 42Ni-F, which is used as a lead frame material.
Known materials such as e-based materials can be used. In addition, Ag, Ag-Cu, etc. are used as the metal foil to be pressed into spot shape.
Known brazing materials such as wax, Al, Cu, etc. can be used. Furthermore, pieces of metal foil of the required dimensions are temporarily fixed on the strip-shaped material at a predetermined pitch, and during this temporary fixing process, reference holes as shown in FIG. Provided at a specified pitch with the foil pieces.

[0015] The following methods can be used to obtain a material in which metal foil pieces of a required size are temporarily fixed at highly accurate pitches. a.
The metal foil and material fed to a fixed length are continuously spot welded at the required intervals and temporarily fixed, and then the unnecessary parts are cut and removed using a rotary cutter, and the metal foil pieces of the required size are temporarily fixed at a high precision pitch to create a cladding. How to get wood. b. At the same time, the metal foil fed to a fixed length was sandwiched and cut with a punch, and at the same time, the punch was spot-welded as a current-carrying material on the material being fed to a fixed length, and the metal foil pieces of the required size were temporarily fixed at a high-precision pitch. How to get cladding material. c. After continuously laser welding the metal foil and material fed to a fixed length at the required intervals and temporarily fixing them, use laser cutting to remove unnecessary parts and temporarily fix the metal foil pieces of the required size at a high precision pitch, or A method of obtaining a temporarily fixed cladding by laser cutting and laser welding while simultaneously pressing metal foil fed to a fixed length onto a material fed to a fixed length using a holding jig.

As an example, the above method b will be explained in detail. (1) A predetermined amount of metal foil of a predetermined width is fed into a cutting device by a fixed size feed device having an attachment/detachment mechanism using a suction machine. (2) When a predetermined length of metal foil overhangs the end face of the guide, the punch is lowered to cut the metal foil into pieces of metal foil. (3) When the metal foil piece cut by the punch is pressed against the material, the metal foil piece is welded by applying pressure and electricity to the roller electrode. At this time, use the punch to punch a reference hole. (4) After spot welding is completed, the fixed size feed device
The clad material is fed in an amount that takes into account deformation due to pressure rolling and finish rolling. For example, after performing steps (1) and (4) above at the same time,
By repeating the cycle of steps (2) and (3), it is possible to obtain a cladding material in which metal foil pieces are temporarily fixed continuously at a required pitch.

Next, the rewound clad material is rolled in a rolling mill in which a backup roll is brought into contact with a pair of work rolls. At this time, it is equipped with a load detection device and a plate thickness gauge.
A rolling load control device performs constant load control. Further, on the exit side of the rolling mill, for example, an optical sensor or a high-precision encoder is provided to measure the pitch of the metal foil pieces. The control method is
It consists of the following steps. (1) Find a quantitative relationship between rolling load fluctuations and pitch fluctuations and a control model based on the rolling load measurement values and the pitch measurement values at that time, and (2) Set a target for obtaining a predetermined pitch. Calculate the rolling load, and (3) perform constant load control by outputting the rolling load as a control standard. (4) Furthermore, the pitch measurement results are fed back to the rolling load control device to appropriately correct the control model and perform comprehensive correction for control errors. By performing cascade control of constant load control and constant elongation control, and by detecting the target position from the pitch after rolling or a required reference point and controlling the target load, ultra-high precision plate thickness control is possible during rolling. Therefore, the desired high-precision pitch control can be achieved.

The rolled clad material is in a state as shown in FIG. 2(b). Next, an example in which the processing method of the present invention is applied to processing a clad material as a strip material,
This will be explained with reference to FIG. As shown in FIG. 1, a cladding material 1 in which metal foil pieces 3 are crimped onto a material 2 at a high precision pitch by the method described above is sent to a press mold by a fixed-size feeding device. The reference hole provided in the clad material 1 is a rectangular reference hole 4 having a short side in the longitudinal direction of the material 2 as shown in FIG. Through the above-described rolling method, the square-shaped reference hole 5 as shown in FIG. High precision pitch control within tolerance of bonding area. In the above-mentioned press mold, when the clad material 1 is sent by the fixed size feed device, the upper mold 1
0 is a lower mold 2 with a large number of holes at a predetermined standard hole pitch.
0 and performs drilling to form a reference hole 6. First, as the upper mold 10 descends, the correction pin 12 is inserted into the reference hole 5 before re-drilling. As a result, if a one-sided deviation error of the reference hole 5 occurs, this error is corrected by mechanical correction accompanying the insertion of the correction pin 12. Next, the upper mold 10
A large number of reference holes 6 that have been re-drilled are further lowered.
Insert guide pins (131 to 13x) to position. As a result, cumulative errors such as differences between the original size and the measured size are absorbed by the play (error) set across the large number of guide pins (131 to 13x). after that,
Further, the upper die 10 is lowered, and the reference hole 5, which was subjected to the above-described mechanical correction during the previous pressing, is re-drilled with the punch 11 to form the reference hole 6 as shown in FIG. 2(c). By repeating such pressing, the cumulative error in the pitch between the metal foil piece 3 and the reference hole 6 can be absorbed to within the same level as the pitch accuracy between the metal foil pieces 3 without measuring the pitch between the metal foil piece 3 and the reference hole 6. can be done. That is, it is possible to obtain the cladding material 1 in which the pitch of the reference holes 6 is controlled with high accuracy within the tolerance of the bonding area when processing the lead frame.

Furthermore, if the correction pin 12 is not inserted into the reference hole 5 before re-drilling, that is, the metal foil piece 3 and the reference hole 5
If there is a large error in the pitch, the correction pin 12 is raised in recognition of this, and the reference hole 5, which was mechanically corrected during the previous press, is re-drilled with the punch 11. This ensures that continuous pressing operations are not interrupted. Furthermore, after such continuous pressing work is completed, when the shape of the re-drilled reference hole is measured and detected by an optical sensor or the like, an irregularly shaped reference hole 6 remains where the reference hole 5 before re-drilling remains.
This makes it possible to easily remove defective parts that have defects, which is effective for industrial production. Note that the present invention can also be applied to strip materials other than clad materials, such as strip materials in which processed members are formed by drawing on a strip-shaped material.

[0020]

As described above, according to the method for processing a strip material of the present invention, when drilling reference holes in a strip material on which processed members have been formed in advance, holes can be drilled not only between the reference holes but also on the strip material in advance. This has the effect that the mutual positional relationship between the formed processing member and the reference hole can be accurately determined, and the reference hole can also be machined at the same time.

[Brief explanation of the drawing]

FIG. 1 shows a sectional view of essential parts of an example of an apparatus for carrying out the method of the present invention.

FIG. 2 is a diagram showing a cladding material as a strip material.

FIG. 3 is a diagram illustrating the processing method of the present invention.

[Explanation of symbols]

1...Strip material (clad material) 2...Material (substrate material) 3...Processed parts (metal foil) 4...Reference hole (before rolling) 5...Reference hole (after rolling and before re-drilling) 6...Reference hole (after re-drilling) 10...Upper mold 10a...Reference surface 11...Drilling punch 12...Correction pin 13 (131 ~ 13x)...Guide pin 20...Lower mold

Claims (1)

[Claims] Claim 1: A method for processing a band material, in which a reference hole is drilled in a band material having a pre-processed workpiece while aligning the material, in which a correction pin, a punch for drilling, and a guide pin are sequentially drilled from the upstream side. The lengths of these pins and punches are in the relationship of drilling punch < guide pin < correction pin. Also, the maximum length of the pin and punch in the strip material feeding direction is in the relationship of drilling punch > guide pin > correction pin. Using a press mold, while lowering the press mold, first insert a correction pin into the reference hole before re-drilling, mechanically correct the misalignment error of the guide hole, and then complete the re-drilling. This method of processing a strip material is characterized in that a guide pin is inserted into the reference hole prepared for positioning, and then a punch is used to re-drill the reference hole corrected during the previous pressing.