JPH07265968A - Press die device - Google Patents

Abstract

PURPOSE:To unnecessitate boring a through hole for dropping a slug into a punch by downward flowing fluid between a punch which is loosely inserted into a stripper plate and the stripper plate. CONSTITUTION:A work 28 is pressed and fixed with the stripper plate 26 through a stripper 30. The work 28 is punched with the punch 24 and a die 42. A fluid path is formed with a loose inserting holes 23 which are bored on the stripper plate 26 and the stripper 30 on the outer peripheral surface of the punch 24 and the inner surfaces of the stripper plate 26 and the stripper 30. After punching work, compressed air is supplied into a clearance between the punch 24 and the loose inserting hole 32 through a sealed chamber 34 during the elevating process of the punch 24 and downward jetted from this clearance. Thus, jetted compressed air strikes a slug of the work 28 and, by elevating the stripper 30, the state of negative pressure between the die 42 and the stripper 30 is cancelled with the compressed air and the slug is downward blown off by fluid pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press die device,
More specifically, the present invention relates to a press die apparatus including an upper die plate, a punch vertically provided on the upper die plate, and a stripper plate provided below the upper die plate and having the punch inserted therein.

[0002]

2. Description of the Related Art An example of a conventional press die device is shown in FIG. The press die device 100 includes an upper die plate 102.
And a punch 104 suspended from the upper mold plate 102,
The stripper 10 is provided below the upper mold plate 102.
6, a lower die base 1 corresponding to the punch 104, and an upper die mechanism 110 having a stripper plate 108 through which the punch 104 is inserted.
Lower die mechanism 11 including die 114 provided in 12
6, and a drive mechanism (not shown) for moving the upper die mechanism 110 into and out of contact with the lower die mechanism 116. By moving the upper die mechanism 110 downward in the direction of the lower die mechanism 116, the work (for example, a semiconductor device lead frame) 118 supported on the die 114 is moved to the punch 1.
It can be punched with 04 and the die 114. The punched scraps 120 of the punched work 118 are dropped and accumulated at a predetermined place in the lower mold mechanism 116.

However, at the time of punching, the work 118 is brought into close contact with and sandwiched by the stripper 106 and the die 114, and when the punch 104 and the stripper 106 move up after punching, a negative pressure state is created between the die 114 and the stripper 106. Therefore, the scrap 12 that should have dropped
There is a case where 0 does not fall and rises and remains on the die 114 (this phenomenon is referred to as scrap rising). The remaining scrap 120 is a cause of damage to the work 118, the die 114, etc. to be processed next, or a positioning failure of the work 118, and therefore must be reliably removed. Therefore, conventionally, the through hole 122 is provided at the center of the punch 104, and the compressed air supply path 126 and the through hole 1 which are formed in the backing plate portion 124 which constitutes the upper mold plate 102.
22 has been contacted. Compressed air is supplied to the compressed air supply passage 126 from a compressor (not shown), and the compressed air is ejected from the opening of the through hole 122 at the lower end of the punch 104. With this configuration, the punched dust 120 of the punched work 118 is prevented from rising by the jetted compressed air, and can be reliably dropped.

[0004]

However, the above-mentioned conventional press die device 100 has the following problems. Depending on the shape of the work 118 to be processed, it is necessary to punch with a plurality of punches 104. In that case,
It is necessary to provide as many compressed air supply passages 126 as the number of punches 104, which complicates the structure of the press die apparatus 100 and reduces versatility.
Further, when processing a semiconductor device lead frame as the work 118, it is necessary to provide a large number of punches 104, and with the recent increase in pin count and fineness of the lead frame, it is indispensable to make the punch 104 finer.
There is also a problem that it is becoming impossible to form the through hole 122 in 04. Therefore, it is an object of the present invention to provide a press die device which has a simple structure and is versatile, and which can surely prevent the scrap from rising without forming a through hole in the punch.

[0005]

In order to solve the above problems, the present invention has the following constitution. That is, in a press die apparatus including an upper die plate, a punch vertically provided on the upper die plate, and a stripper plate provided below the upper die plate and in which the punch is inserted, the punch is A fluid ejecting mechanism is provided which is loosely inserted in the stripper plate and which causes a fluid supplied between the punch and the stripper plate to flow downward.

For example, the fluid jetting mechanism has a closed chamber provided so as to surround the punch between the upper mold plate and the stripper plate, and an inflow port for introducing a fluid into the closed chamber. It may be configured. Further, the closed chamber may be formed by inserting an elastic member between the upper die plate and the stripper plate, or the closed chamber may surround a plurality of the punches. Good. Further, a compressor that supplies compressed air to the inflow port may be provided as the fluid supply means.

[0007]

[Operation] The operation will be described. Since the punch is loosely inserted in the stripper plate and a fluid ejecting mechanism for flowing the supplied fluid downward is provided between the punch and the stripper plate, the supplied fluid can be discharged between the punch and the stripper plate. And spouts downward. Therefore, when punching a workpiece, the punched dust of the workpiece can be pushed downward by the pressure of the ejected fluid and fall. Especially when a closed chamber is provided,
There is no need to provide a fluid flow path in the upper mold plate. Also,
With a structure in which a plurality of punches are arranged in one closed chamber, a plurality of punches can be handled by the fluid supplied from one inflow port.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows a cross-sectional view of a main part of a press die device 10 for punching a semiconductor device lead frame (an example of a work). Press die device 10
Is composed of an upper mold mechanism 12 and a lower mold mechanism 14, and the upper mold mechanism 12 is connected to the lower mold mechanism 14 by a drive mechanism (not shown) (for example, a known motor press mechanism, air press mechanism, hydraulic press mechanism, etc.). It can be moved in and out (movement up and down). In the upper die mechanism 12, 16 is an upper die plate 16,
It comprises a holder portion 18, a backing plate portion 20 and a punch plate portion 22. Reference numeral 24 denotes a punch, which is sandwiched between the punch plate portion 22 and the backing plate portion 20 and fixed to the upper die plate 16 in a vertically extending state.

Reference numeral 26 denotes a stripper plate, which is arranged below the upper mold plate 16 at a distance and is connected to the upper mold plate 16. A stripper 30 for pressing the work 28 is fixed to the lower surface of the stripper plate 26. The stripper plate 26 and the stripper 30 have loose insertion holes 32 in which the punch 24 is loosely inserted. In the case of this embodiment, the clearance between the outer peripheral surface of the punch 24 and the inner peripheral surface of the free insertion hole 32 of the stripper 30 is set to 2/1000 to 5/1000 mm.

Reference numeral 34 is a closed chamber which constitutes an example of a fluid ejection mechanism, and is formed so as to surround the punch 24 between the punch plate portion 22 and the stripper plate 26. The closed chamber 34 is formed by inserting an elastic member 36 (for example, a rubber-based member such as urethane rubber or silicon rubber) between the punch plate portion 22 and the stripper plate 26 and airtightly fixing the member. The elastic member 36 is compressible at least in the vertical direction, and by this compression, the stripper 30 first presses the work 28,
The tip (lower end) of the punch 24 projects from the lower surface of the stripper 30 by a length that allows punching of the work 28.
Can be punched. Reference numeral 38 denotes an inflow port that constitutes an example of a fluid ejection mechanism, and is provided to introduce compressed air (an example of fluid) into the sealed chamber 34. Inlet 38
Are formed by hermetically inserting the pipe into the elastic member 36. The inflow port 38 is connected to a compressor, which is a fluid supply means (not shown), so that compressed air can be constantly supplied. The compressed air may be supplied into the closed chamber 34 at all times, but an electromagnetic valve is provided between the inlet 38 and the compressor, and a downward movement of the punch 24 is started by using a control means such as a limit switch. Punch from time 24
The compressed air may be supplied only until the end of the upward movement.

With the above fluid ejection mechanism, the punch 2 is provided by the closed chamber 34 and the inflow port 38 connected to the compressor.
The compressed air supplied between the stripper plate 4 and the stripper plate 26 can be jetted downward through the clearance between the two. By adopting this structure, it is possible to cool the punch 24 that is overheated by punching the work 28. When an air-driven press is used as the drive mechanism of the upper mold mechanism 12, a part of the drive air (compressed air) may be introduced into the inflow port 38 without providing a dedicated compressor. In that case, the introduction of compressed air may be linked with the clutch of the drive mechanism. In the example shown in FIG. 1, only one punch 24 is shown in one closed chamber 34, but a plurality of punches 24 are provided in one closed chamber 34 (when a large number of fine punches are provided. May be included).

Next, the lower mold mechanism 14 will be described. 40
Is the lower mold base and is fixed. Reference numeral 42 denotes a die, which cooperates with the lower punch 24 to punch the work 28. The die 42 is fixed in the lower die base 40.
A hole 44 through which the punch 24 passes is formed in the die 42 so that punched scraps can be dropped and accumulated at a predetermined place. 46 is a protruding pin,
It is constantly urged upward by the spring 48. When the upper die mechanism 12 moves downward and the stripper 30 presses the work 28 onto the die 42, the ejecting pin 46 moves downward to a position where the upper end surface thereof coincides with the upper surface of the die 42. on the other hand,
After the punching of the work 28 is completed, the upper die mechanism 12 moves upward, the stripper 30 releases the work 28, and when the punch 24 comes out of the work 28, the upper end surface is projected from the upper surface of the die 42 by the biasing force of the spring 48. Work 2
8 is released from the die 42.

In the press die apparatus 10 having the above structure, the upper die mechanism 12 is moved downward to move the punch 24 and the die 42.
When punching out the work 28 with at least the stripper 3
0 and compressed air are supplied into the closed chamber 34 during the upward movement process of the punch 24. Then, since the supplied compressed air has a flow path (clearance) only between the punch 24 and the loose insertion hole 32, it is jetted downward from the flow path. As a result, the jetted compressed air hits the scraps of the work 28, and even if the stripper 30 moves upward, a negative pressure is canceled between the die 42 and the stripper 30, and the negative pressure state is canceled by the compressed air. It is possible to blow down the scraps by pressure.
Therefore, it is possible to reliably prevent the scraps from remaining on the die 42. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and may be, for example, the outer peripheral surface of the punch 24 and / or the loose insertion hole 3.
2 A groove for ejecting fluid may be engraved on the inner peripheral surface to positively determine the ejection position. In addition, the punch 24 is used as a fluid.
It is also possible to use cooling oil. Further, it is needless to say that many modifications can be made without departing from the spirit of the invention, such as mixing mist-like oil with compressed air as a fluid.

[0014]

When the press die apparatus according to the present invention is used, the punch is loosely inserted in the stripper plate, and a fluid ejection mechanism for flowing the fluid supplied between the punch and the stripper plate downward is provided. ing. Therefore, it is possible to push and drop the scraps of the work punched out by passing the fluid between the outer periphery of the punch and the inner periphery of the hole of the stripper plate downward by the pressure of the ejected fluid. it can. According to this structure, since it is not necessary to form a through hole in the punch, it is possible to sufficiently cope with the fineness of the punch. Further, if the configuration of claim 2 is adopted, since it suffices to supply the fluid to the closed chamber, it is not necessary to provide the fluid passage in the upper mold plate, and the structure can be simplified. Further, when the configuration of claim 4 is adopted, a plurality of punches can be arranged in one closed chamber, so that the fluid supplied from one inflow port can be used for a plurality of punches, and the structure can be simplified. In addition,
Even if the punch arrangement is changed, it is possible to provide a press die device having versatility, which is very effective.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of a press die device according to the present invention.

FIG. 2 is a sectional view of a main part of a conventional press die device.

[Explanation of symbols]

 10 Press Mold Device 16 Upper Mold Plate 24 Punch 26 Stripper Plate 28 Work 34 Sealing Chamber 36 Elastic Member 38 Inlet

Claims (6)

[Claims] 1. A press die apparatus comprising: an upper die plate; a punch vertically provided on the upper die plate; and a stripper plate provided below the upper die plate and having the punch inserted therein. The press die apparatus, wherein the punch is loosely inserted in the stripper plate, and a fluid ejecting mechanism is provided between the punch and the stripper plate for flowing a fluid supplied downward. 2. The fluid ejection mechanism comprises a closed chamber provided so as to surround the punch between the upper die plate and the stripper plate, and an inlet for introducing a fluid into the closed chamber. The press die device according to claim 1, wherein: 3. The press mold apparatus according to claim 2, wherein the closed chamber is formed by inserting an elastic member between the upper mold plate and the stripper plate. 4. The press die apparatus according to claim 2, wherein the closed chamber surrounds a plurality of the punches. 5. The press mold apparatus according to claim 2, further comprising a compressor that supplies compressed air to the inflow port. 6. The press die apparatus according to claim 5, wherein the compressed air is mixed with mist-like oil.