JPH05315497A - Manufacture of lead frame-shaped product - Google Patents

Abstract

PURPOSE:To realize a continuous processing by a method wherein when a plurality of processing processes are executed in order on a material to be processed by a plurality of pieces of processing units in the pitchwise-feeding of the material to be processed to its feed direction, unworked parts are formed on the material to be processed in every (n) pieces and the unworked parts are cut. CONSTITUTION:A plurality of processing units, such as a first processing unit for boring pilot holes 3, a second processing unit for punching a circular hole and 4 pieces of square holes 12 and a third processing unit for punching 4 pieces of square holes 13 at the opposed positions to the positions of the 4 pieces of the square holes 12, are fed to the feed direction of a material 10 to be processed and are provided at pitches P. The operations of the first and third processing units are made to stop in good order in every (n) times, such as in every 5 times, whereby unworked parts 15 are formed, the material 10 processed in such a way is wound on a roll and after the material 10 is subjected to processing treatment in addition to a treatment, the parts 15 are cut into a rectangular form as cutting sites. This cutting is performed in such a way that roughened engaging parts 16 are formed, for example, and after that, molded parts 9 are formed on the material 10 to complete a lead frame-shaped product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lead frame-shaped product such as an IC lead frame from a hoop material or a strip-shaped material by so-called progressive feeding means.

[0002]

2. Description of the Related Art Conventionally, when a sheet metal product having a predetermined shape is manufactured by punching, bending, drawing, or compressing a plate made of a structural material such as a steel plate, several steps are required. Is normal. When the number of sheet metal products manufactured is large, each process or stage is individually processed in one processing die, and the workpiece is sequentially sent to the next stage to add processing. Then, the method of completing the processing at the final stage is adopted. Such a processing die is called a progressive die, and for example, one sheet metal product can be obtained for each stamp of the press, and therefore it has an advantage of extremely high efficiency.

In the above-mentioned conventional progressive feed die,
It has the advantages that the production speed is high, the delivery time is short after the work material is put in and the processing is completed, the number of work in progress in the intermediate process of the press working is small, and it is possible to mass-produce by a small number of people. There is a problem.
That is, since a plurality of pairs of punches and dies are incorporated in one die, the die structure becomes extremely complicated, requires highly accurate die manufacturing technology, and lengthens the manufacturing period, resulting in a high manufacturing cost. Will be very expensive.

Further, even in the case of partial damage, repair and adjustment of the mold, it is necessary to disassemble the whole mold, and since these operations are complicated, a lot of time and man-hours are required. Furthermore, in a high-mix low-volume production, if the shape and size of the work piece are slightly different and a dedicated die is produced each time, the die cost becomes expensive, and the demand gradually increases in recent years. However, there is a problem in that it cannot meet the so-called FMS production system, which is increasing.

In order to solve such a problem, the present applicant has already filed an application for a progressive working apparatus having a simple structure and capable of easily performing partial adjustment and the like (for example, Japanese Patent Application No. Hira 2-121760, 2-1
No. 21761).

FIG. 7 is a perspective view of an essential part showing an example of the progressive feeding apparatus. In FIG. 7, reference numerals 100 to 500 are processing units, respectively, on which a work piece (not shown) is provided on the base 1.
2P in the feed direction (P is the feed pitch of the work material)
It is arranged at intervals of. These processing units 100 to 50
0 is provided with a pair of punches and dies corresponding to a plurality of processing steps, and the configuration of the processing unit 100 will be described as an example. Reference numeral 101 denotes a main body, which is formed in a substantially U-shape, and is provided with a dovetail-shaped dovetail 102 integrally formed at a lower end portion,
By engaging with the dovetail groove 103 provided in the base 1, it is possible to adjust the movement in the feed direction of the work material and to restrain the movement in the direction perpendicular to the feed direction of the work material. 104
Is a movement adjusting device, and 105 is a clamp device. 106
Is a hydraulic cylinder and is provided at the upper end of the main body 101.
A position measuring device 107 is provided on the side surface of the hydraulic cylinder 106.

Next, reference numeral 108 denotes a cassette, which is formed in a substantially U shape and has a punch or a die (neither is shown) on the upper part.
Is provided so as to be movable up and down, and a punch or a die or a pair (not shown) paired with the die is provided at the bottom, and is detachably provided on the main body 101. The cassette 108 is positioned by engaging the positioning members 309 and 310 as shown in the processing unit 300. 111 is a clamp screw. That is, the cassette 108 is positioned by a positioning member (not shown, the processing unit 3
Main body 1 through reference numerals 309 and 310 in 00)
It is configured such that a predetermined positioning can be performed by mounting it on 01 and the position can be fixed by tightening the clamp screw 111. After the cassette 108 is fixed, the operating rod (not shown) of the hydraulic cylinder 106 is connected to the punch or die that is vertically movable.

FIG. 8 is an explanatory view of a main part showing a processed state of a work material, (a) shows a plane, (b) shows a cross section, and the same parts are designated by the same reference numerals as those in FIG. Indicate. Figure 8
2 is a material to be processed, which is intermittently pitch-fed at a pitch P in the arrow direction. That is, in FIG.
Pitch feed is performed in a gap between a pair of punches and a die provided in the cassette 108 (similarly in other cassettes). 7 and 8, the processing units 100 to 500 are shown.
Are the pilot hole 3 machining process and the arcuate cut 4 respectively.
It is formed so as to correspond to the above-mentioned processing step and the first to third drawing processing steps.

First, the processing unit 100 is provided with a punch and a die for forming the pilot hole 3, and the pilot hole 3 is provided at a position P on the downstream side in the feeding direction of the workpiece 2.
A guide (not shown) that engages with. Therefore, the pilot holes 3 are sequentially drilled each time the machining unit 100 is operated, and the guides are engaged with the drilled pilot holes 3 to prevent undesired displacement of the workpiece 2 and improve accuracy. Can be held.

Next, in the processing unit 200, the arcuate cut 4 is processed. And processing unit 30
At 0, the first drawing process is performed to form a bowl-shaped projection 5 on the workpiece 2, and the arcuate notch 4 widens to change into an arcuate groove 6. Further, in the processing unit 400, the second drawing process and the processing of the flange hole 7 are performed, and the height of the protrusion 5 increases. In the processing unit 500, the third drawing process is performed to form the height of the protrusion 5 into a predetermined size. After that, although not shown in the drawing, a predetermined bowl-shaped sheet metal product is obtained by performing edge cutting and other processing. Processing units 200 to 500
Also in the above, it is needless to say that the positioning for ensuring the predetermined accuracy is performed by providing the guide that engages with the pilot hole 3.

According to the progressive feeding apparatus having the above configuration, FIG.
It is possible to efficiently manufacture the IC member as shown in FIG. 9A and 9B are explanatory views showing an example of an IC member, where FIG. 9A is a plane and FIG. 9B is a side surface. In FIG. 9, 8 is a lead portion projecting from the periphery of a lead frame (not shown),
Reference numeral 9 denotes a mold part having an IC and other functional parts built therein.

FIG. 10 is an essential part explanatory view showing a processed state of the conventional lead frame having the above-mentioned structure, and corresponds to FIG. In FIG. 10, reference numeral 10 denotes a work material made of a conductive material, which is intermittently fed at a pitch P in the arrow direction. Reference numerals 100, 120, and 130 are processing units, for example, 2P in the feed direction of the workpiece 10.
It is arranged at intervals of. These processing units 100,
120 and 130 have the same structure as that shown in FIG. 7, and are provided with a pair of punches and dies corresponding to the processing steps.

First, the machining unit 100 is provided with a punch and a die for forming the pilot hole 3, and a guide (not shown) engaged with the pilot hole 3 at a position P on the downstream side of the workpiece 10 in the feeding direction. ) Is provided. Therefore, the pilot holes 3 are sequentially drilled each time the machining unit 100 is operated, and the guides are engaged with the drilled pilot holes 3 to prevent undesired displacement of the workpiece 10 and improve accuracy. Can be held.

Next, in the machining unit 120, the circular hole 11 and the four square holes 12 are punched out, and in the machining unit 130, the four square holes 13 in diagonal positions are punched out, and the leads shown in FIG. The part 8 is formed. Since the machining units 120 and 130 are also provided with the guides that engage with the pilot holes 3 formed in the workpiece 10, positioning is performed to ensure a predetermined accuracy. It is similar to that of the processing mode shown in FIG.

After carrying out the predetermined progressive machining as described above, the workpiece 10 is wound on a roll and conveyed to the next step, for example, washed, plated, heat treated, and then stripped. It is cut into a shape. Then, as shown in FIG. 11, the IC and other functional parts are set at predetermined positions, the leads 8 are connected, and the mold 9 is formed.
In FIG. 11, the processed portion 14 is shown by a chain line except for one portion, and shows an example in which the workpiece 10 is cut into five strips each having a strip shape.

Next, the strip-shaped workpiece 10 on which the mold portion 9 has been formed as described above is stored in the magazine of the processing unit that constitutes the next processing step (the storage operation is usually manual), and the robot is operated. It is inserted into the processing unit via another take-out device. Then, the bending process of the lead portion 8 and the cutting process from the workpiece 10 are performed, and
Thus, the IC member shown in is obtained.

[0017]

In the above-mentioned conventional manufacturing method, the functional parts are set in the processed portion 14 although the progressive processing can be efficiently applied to the hoop-shaped workpiece 10. Since it is necessary to form the mold portion 9 after that, the workpiece 10 must be cut into strips as shown in FIG. Therefore, in the subsequent processing steps, all the strip-shaped workpieces 10 are handled, and the work of attaching / detaching to / from the processing unit, handling, carrying, and the like are complicated, and a large number of man-hours are required. Further, even when the processing unit itself is automated, since the supply of the strip-shaped workpiece 10 depends on human power, unmanned operation cannot be performed and the operation rate of the automatic processing unit is reduced. There is a problem of causing it.

Further, in the case of small-quantity production or multi-product production, it is possible to meet the demand for shorter delivery time in the case where the fixed-length material is processed into a strip shape and then pressed, rather than the progressive feed processing using the hoop material as described above. .. However, in this case, the above-mentioned progressive machining is rarely carried out. That is, when a strip-shaped material is processed by a progressive die, a so-called blanking or blanking state occurs before and after the strip-shaped material, and this is because the punch and the die are engaged with each other in the absence of the material. ， Because it will damage the mold. Therefore, it is necessary to process the strip-shaped material for each process, which is very inefficient.

It is an object of the present invention to solve the problems existing in the above-mentioned prior art, and to provide a method for manufacturing a lead frame-shaped product, which facilitates continuous processing and automation and can save labor. Is.

[0020]

In order to achieve the above object, in the first invention, mP (m is an arbitrary positive value) in the feed direction of the hoop-shaped workpiece corresponding to a plurality of processing steps. An integer, P is a lead frame-shaped product configured to sequentially perform the plurality of processing steps with respect to the pitch feed of the workpiece by a plurality of processing units arranged at intervals of the feed pitch of the workpiece. In the manufacturing method, the non-machined portion is formed every n pieces (n is an arbitrary positive integer) on the workpiece, and the strip-shaped workpiece is formed by cutting at the non-machined portion. A technical means was adopted in which another processing was carried out, the work pieces were connected again in a hoop shape, and the subsequent processing steps were sequentially carried out in the same manner as described above.

Next, according to the second aspect of the invention, mP is applied in the feed direction of the hoop-shaped workpiece in correspondence with a plurality of processing steps.
A plurality of processing units arranged at intervals of (m is an arbitrary positive integer, P is a feed pitch of the work material) are used to sequentially perform the plurality of processing steps for pitch feed of the work material. In the method for manufacturing a lead frame-shaped product configured as described above, an engaging portion is processed at the end of the hoop-shaped workpiece currently being machined and the tip of a new hoop-shaped workpiece, and the engaging portion is used to insert the engaging portion. A technical means is adopted in which both the workpieces are connected to each other and the same progressive feed machining as that for the workpiece currently being machined is continuously performed for a new workpiece.

Further, according to the third aspect of the present invention, a plurality of machining steps are provided at intervals of mP (m is an arbitrary positive integer, P is a feed pitch of the work material) in the feed direction of the work material. In the method for manufacturing a lead frame-shaped product, which is configured to sequentially perform the plurality of processing steps with respect to the pitch feed of the material to be processed by the plurality of processing units described above, the ends of the strip-shaped material are sequentially processed. Connected to form a long continuous work material, and for the connection part of this work material, selectively stop the operation of the work units other than the work unit of the pilot hole for positioning the work material. We adopted the technical means of forming a non-processed part.

[0023]

With the above construction, the material to be processed is cut into strips and carried out only when other processing with a relatively long processing time is carried out, and efficient progressive machining can be applied in the subsequent processing steps. .. Further, since the work material is provided with the non-working portions at appropriate intervals, it is possible to perform pitch feeding and positioning with respect to the work material in the subsequent processing steps even if cutting is performed at this portion. Work pieces can be connected in a hoop shape.

Further, since the end of the workpiece currently being machined and the tip of a new workpiece can be connected to carry out the progressive machining continuously, the time loss for exchanging the workpiece is greatly increased. Can be reduced.

Furthermore, even if strip-shaped materials are used, they can be connected in sequence and processed sequentially, so that the production efficiency can be greatly improved.

[0026]

EXAMPLE FIG. 1 is a plan view of a main part showing a processed state of a work material in an example of the present invention. (A) shows a processed state of a front stage, (b) shows a processed state of a rear stage, and the same portion Is shown in FIG.
And the same reference numerals as in FIG. First, in FIG. 1 (a), reference numeral 15 denotes a non-processed portion, which is a portion other than the pilot hole 3 where processing is not performed.

That is, the working units 120 and 130 in FIG. 10 are operated five times, and generally n (n)
Is a positive integer) and can be formed by stopping in order. Processing unit 120, 1 applied to the present invention
30 (see FIG. 10) is the processing unit 1 shown in FIG.
Similar to 00 to 500, since each has an independent hydraulic cylinder, it is possible to easily stop the operation as described above by the action of an appropriate control device.

Workpiece 10 processed as described above
Is wound on a roll in the same manner as in the conventional method, subjected to other predetermined processing, and then cut into strips. The cut portion in this case is the non-processed portion 15 of the work material 10,
In addition, as shown in FIG. 1 (b), it is preferable to cut so as to form, for example, the uneven engaging portion 16. The cutting including the formation of the engaging portion 16 is performed in the pilot hole 3
If it is carried out based on, the cutting site is constant, and there is compatibility in the connection work described later, which is advantageous.

The means for forming the mold portion 9 on the workpiece 10 cut into strips is the same as that of the conventional method described above, but thereafter, as shown in FIG. 1 (b), the strip-shaped workpiece 1 is formed.
0 is connected via the engaging portion 16. In this case as well, after the connection work is performed with the pilot hole 3 as a reference, the work is wound on a roll, and the subsequent bending of the lead portion 8 and the cutting from the workpiece 10 are performed by the same progressive feeding as described above. The connecting work may be performed only by press-fitting the engaging portion 16, but spot welding, use of an adhesive agent, or the like may be used together if necessary. In addition, the shape of the cut portion may be a shape other than the uneven engaging portion 16.

FIG. 2 is a plan view of a main portion showing a processing portion of a processing unit according to another embodiment of the present invention. In FIG. 2, reference numeral 140 denotes a connection part removal type, which is configured by a punch and a die having the same configuration as the processing units 100, 120 and 130 in FIG. Reference numerals 10a and 10b respectively show a work material currently being processed and a new work material. Then, the end 20 of the workpiece 10a currently being machined and the tip 21 of the new workpiece 10b are brought close to each other, and the machining contour 1 of the connection part cutting die 140 is formed.
The connection part removal die 140 is operated in a state in which the end 20 and the tip 21 are positioned so as to be included in 41.

FIG. 3 is a plan view showing a work piece having a processed connection portion, and the same portions are denoted by the same reference symbols as those in FIG. In FIG. 3, 22 and 23 are engaging parts,
The terminal end 20 and the tip end 21 are formed in a concavo-convex shape that can be engaged with each other. Reference numeral 24 is a pin hole, which is formed in a semicircular shape at the portions corresponding to the terminal end 20 and the tip end 21, respectively. By processing the joint portion as described above, the workpiece 10
It is possible to connect a and 10b without polymerizing.

FIG. 4 is an explanatory view showing a connection state of the work pieces, (a) shows a main part plane of the work pieces after the connection,
(B) shows a vertical cross-section of the main part of the press-fitting type for connection, and the same portions are denoted by the same reference symbols as those in FIGS. FIG. 3
Materials 10a, 10b processed as described above
Is, for example, as shown in FIG.
By engaging with each other, they are connected while maintaining the same thickness dimension. In this case, if the press-fitting mold 150 for connection as shown in FIG. 4B is used, the connecting work can be carried out efficiently.

In FIG. 4 (b), reference numerals 25 and 26 denote an upper die and a lower die, respectively, which constitute the press-fitting die 150 for connection, which are provided so as to face each other and the upper die 25 is vertically movable. .. Numeral 27 is a positioning pin, which is provided on the lower die 26 so as to be vertically movable and urged upward by a spring 28. With the above configuration, the workpiece 10
When connecting a and 10b, each has a semicircular pin hole 2
4 (not shown, see FIG. 4A) is brought into contact with the positioning pin 27 and placed on the lower mold 26. Next, when the upper die 25 is operated in the direction of the arrow, the workpieces 10a and 10b are integrally connected with the engaging portions 22 and 23 as shown in FIG. 4A.

The connection press-fitting mold 150 shown in FIG.
Is preferably provided at an intermediate portion between the connection part cutting die 140 and the progressive feeding unit shown in FIG.
0 and the connecting press-fitting mold 150 may be provided separately from the progressive processing line. Further, by controlling the operation of the punch of the connecting portion removing die 140, it can be used also as the connecting press-fitting die 150. Further, it is preferable that the processing unit does not process the connection portion between the workpieces 10a and 10b thereafter, but it may be processed as long as the connection state is not adversely affected.

FIG. 5 is a diagram for explaining the connection state of strip-shaped materials, (a) showing a plane and (b) showing a side surface. In FIG. 5, 30 is a strip-shaped material, and the end faces 31 are butted.
By adhering the adhesive tape 32 to the front and back, the continuous long work material 10 is formed. The strip-shaped material 30
In addition to the adhesive tape 32, other connecting means such as butt welding or spot welding may be used as the means for connecting.

FIG. 6 is a plan view of an essential part showing a processed state of a work material in still another embodiment of the present invention. The hatched portion in FIG. 6 is the connection portion, and the unprocessed portion 33
Is a region where no machining is performed except for the pilot hole 3. Unlike the non-machined portion 15 shown in FIG. 1, the non-machined portion 33 is not necessarily an integral multiple of the feed pitch of the workpiece 10, but the machining units 120 and 130 (see FIG. 10) has independent hydraulic cylinders like the processing units 100 to 500 shown in FIG. 7, the operation of the non-processing portion 33 is selectively stopped by the action of an appropriate control device. It is easily possible. The non-processed portion 33 is finally cut or scrapped. Even if it is a strip-shaped material as described above, by connecting these,
It is possible to carry out the same progressive processing as the hoop material.

In this embodiment, an example of manufacturing an IC member is described, but it is needless to say that it can be applied to the manufacture of other lead frame-shaped products. The present invention can be widely applied to a mode in which the material is cut into a shape, another processing is performed, the work material is connected again in a hoop shape, and the subsequent progressive processing is performed.

[0038]

EFFECTS OF THE INVENTION Since the present invention has the structure and operation as described above, continuous processing and automatic processing can be easily performed on a hoop-shaped workpiece, and labor can be saved, resulting in processing efficiency. It is possible to significantly improve the manufacturing cost and reduce the manufacturing cost.

Further, even when the material to be processed is replaced with a new one in units of hoops, the replacement work is easy, the time loss can be greatly reduced, and the operating rate of the progressive processing apparatus is greatly improved. There is an effect that can be made.

Furthermore, these are connected to strip-shaped materials which conventionally depended only on press working by a single die,
In addition, by selectively stopping the processing for the connecting portion, the same progressive processing as that for the hoop shape can be performed, and there is an effect that high-efficiency processing can be performed even in small-quantity multi-product production.

[Brief description of drawings]

FIG. 1 is a plan view of a main part showing a processing state of a material to be processed in an example of the present invention, (a) shows a processing state of a front stage, and (b) shows a processing state of a rear stage.

FIG. 2 is a plan view of a main portion showing a processing portion of a processing unit according to another embodiment of the present invention.

FIG. 3 is a plan view showing a material to be processed having a connection portion.

FIG. 4 is an explanatory view showing a connection state of workpieces,
(A) shows the plane of the main part of the workpiece after connection, and (b) shows the vertical cross section of the main part of the press-fitting type for connection.

FIG. 5 is a diagram illustrating a connection state of strip-shaped materials,
(A) shows a plane and (b) shows a side surface.

FIG. 6 is a plan view of a main portion showing a processed state of a work material according to still another embodiment of the present invention.

FIG. 7 is a perspective view of a main part showing an example of a progressive processing device.

FIG. 8 is an explanatory view of a main part showing a processing state of a work material,
(a) shows the plane and (b) shows the cross section.

9A and 9B are explanatory views showing an example of an IC member, where FIG. 9A is a plane and FIG. 9B is a side view.

FIG. 10 is an explanatory view of a main part showing a processed state of a conventional lead frame.

FIG. 11 is a plan view of relevant parts showing a material to be processed when a conventional mold part is formed.

[Explanation of symbols]

10 Work Material 15,33 Non-Processing Part 100,120,130,200,300,400,5
00 Processing unit

Claims (3)

[Claims] 1. A plurality of hoop-shaped workpieces arranged at intervals of mP (m is an arbitrary positive integer, P is a feed pitch of the workpiece) corresponding to a plurality of machining steps. In the manufacturing method of the lead frame-shaped product, which is configured to sequentially perform the plurality of processing steps with respect to the pitch feed of the material to be processed by the processing unit of, the number of the processed materials is n (n is an arbitrary positive integer). ) Place a non-processed part everywhere, cut at this non-processed part to form a strip-shaped work material, perform other processing in this state, and connect the work material again in a hoop shape. A method of manufacturing a lead frame-shaped product, characterized in that the subsequent processing steps are sequentially performed in the same manner as described above. 2. A plurality of hoop-shaped workpieces arranged at intervals of mP (m is an arbitrary positive integer, P is a feed pitch of the workpiece) corresponding to a plurality of machining steps. In the method of manufacturing a lead frame-shaped product, which is configured to sequentially perform the plurality of processing steps with respect to the pitch feed of the material to be processed by the processing unit, the end of the currently processed hoop-shaped material and a new The engaging part is processed at the tip of the hoop-shaped workpiece, and the two workpieces are connected through this engaging part, and the same progressive machining as the progressive machining for the workpiece currently being machined is newly added. The method for manufacturing a lead frame-shaped product, which is continuously performed on the material to be processed. 3. A plurality of processing units corresponding to a plurality of processing steps and arranged at intervals of mP (m is an arbitrary positive integer, P is a feed pitch of the material to be processed) in the feed direction of the material to be processed. Thus, in the method of manufacturing a lead frame-shaped product configured to sequentially perform the above-described plurality of processing steps with respect to the pitch feed of the material to be processed, the end portions of the strip-shaped material to be processed are sequentially connected and the A continuous workpiece is formed, and the operation of the processing units other than the processing unit of the pilot hole for positioning the workpiece is selectively stopped at the connection of the workpiece to form the non-processed portion. A method for manufacturing a lead frame-shaped product, comprising: