JP4273188B2 - Anti-fogging device for press punching - Google Patents

Description

The present invention relates to an apparatus for preventing smoldering generated in a press die during press punching.

For lead frames or connector parts manufactured by press punching, a long strip-shaped workpiece is formed into a predetermined shape by performing press punching while sequentially feeding it on the processing stage of the mold. This will be described with reference to FIG. FIG. 9 is a cross-sectional perspective view showing a state immediately after the punch 1 and the die 3 punch the workpiece 2 in the press punching process. 4 is a punch mark immediately after punching, 5 is a punch mark punched one shot before, 6 is a punch mark punched two times before, 7 is a punch mark punched three times before, It is in the state which has fallen from the discharge port 9. Thus, the scrap is sequentially pushed into the die by the punch 1 and finally falls from the discharge port 9. When the punch 1 returns to the passage surface 12 of the die, when the punch 1 returns, the so-called debris 4 is lifted from the die 3, and the soot 4 is removed from the die 3. If it adheres to the work material installation surface 8 or the surface of the work material 2, it will not be possible to continuously perform press punching, but it may cause damage to the mold and defective quality.

In order to solve the above problem of fogging, various fogging prevention devices are known.

FIGS. 10 and 11 show a device for preventing fogging in Patent Document 1. FIG. The inclined grooves 14A and 14B in the opposite direction with respect to the passing direction of the scraping are formed in the discharge port 9 by a laser 13 (not shown) from a position away from the cutting edge 11 on the passing face 12 of the die 3 by the distance d. By providing relative movement between the punch 4 and the tip of a punch, ie, a punch (not shown), the punch 4 and the tip of the punch are easily peeled off. This is a method of locking to the passing surface 12.

FIG. 12 shows a device for preventing fogging in Patent Document 2. The passing surface 12 from the cutting edge portion 11 of the die 3 to the discharge port 9 has a tapered shape that decreases from the cutting edge portion 11 toward the discharge port 9. This is a method of locking the scraper to the die by utilizing the reaction force of the compressive force that gradually increases to the scrap 4.

FIG. 14 shows the anti-fogging device in Patent Document 3. A wedge-shaped groove 16 that narrows from the cutting edge portion 11 toward the discharge port 9 is formed on the passage surface 12 that extends from the cutting edge portion 11 of the die 3 to the discharge port 9, and the removal debris 4 is volume-compressed. In this process, the scraper is locked to the die using the reaction force of the compression force that gradually increases to the scraper 4.

JP-A-10-146626 JP-A-6-238377 JP 2004-148356 A

However, in Patent Document 1 shown in FIGS. 10 and 11, since there is a concern about the occurrence of burrs, no grooves are formed in the cutting edge portion 11, and the locking force is increased until the scraped parts reach the inclined grooves 14 </ b> A and 14 </ b> B. Therefore, a stable effect cannot be obtained. In addition, by providing an inclined groove in a direction different from the passing direction by a laser from a position separated from the distance d so as not to interfere with the cutting edge 11, the position management of the distance d can be performed even when a new die is manufactured. Obviously, it is difficult to manage at the time of continuous press punching which requires re-grinding. Moreover, in this patent document 1, since the groove | channel is not provided in the cutting-blade part 11 of the die | dye 3, and the to-be-processed material installation surface 8, it is volumetric in the process in which a punch is pushed by a punch and passes the scraping passage surface 12. As shown in Patent Document 2, it is not possible to expect the effect of preventing the rise using the reaction force of the compression force that gradually increases as it is removed.

Further, in Patent Document 2, as shown in FIG. 13, as shown in FIG. 13, the removal marks 5 and 6 locked to the passage surface 12 of the removal of the die, and a new removal mark 4 that is in close contact with the punch 1 and fits into the die 3. There is no escape space for the air 15 interposed between them, and the air is compressed by press punching process to generate a large repulsive force, which acts as a force to make the punched out contact with the punch, and the punch 1 rises from the bottom dead center When doing so, the negative pressure generated between the punch and the debris also becomes large, so that there is a problem that scumming tends to occur.

Similarly, also in Patent Document 3, as shown in FIG. 15, new punches 5 and 6 locked to the punching passage surface 12 of the die 3 and new punches that fit into the punch 3 in close contact with the punch 1. There is no escape space for the air 15 interposed between the punch 4 and the air is compressed by a press punching process to generate a large repulsive force. When rising from the dead center, the negative pressure generated between the punch and the scum is increased, so that there is a problem that the scum is likely to occur. Patent Document 1 also does not show a method for eliminating the repulsive force caused by the compressed air. Neither Patent Document 2 nor Patent Document 3 discloses a method for eliminating the repulsive force generated by the compressed air in the case where a plurality of chips are present on the passing surface.

Also, when punching thin workpieces at high speed, such as narrow-pitch connector parts, if the punch is locked to the die passing passage surface, it will be fitted into the die in close contact with the punch. The air intervening between the punch and the punch is abruptly compressed to generate a large repulsive force, which acts as a force to bring the punch and the punch into close contact with each other. Since the negative pressure generated between the scum increases, the scum rises easily. Further, since a thin work material has a small contact area with the die and a low stiffness of the material, the locking force for pulling the die into the die is often weak. For the above reasons, it is necessary to eliminate the repulsive force caused by the compressed air in order to prevent scumming in high-speed press punching of a thin workpiece.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide a device that reliably prevents the press-up process from being lifted even when a plurality of punches are present on the passing surface. To do.

In the press punching die of the work material of the present invention, the groove formed on the work material installation surface communicates with the notch of the cutting edge portion and the groove formed in a different direction with respect to the passing direction of the cutting edge. An air escape groove interposed between a new squeeze that is in close contact with the punch and fits into the die. next, the depth of the groove so as to form so as to decrease gradually toward the dregs passage area punching becomes maximum at the notch gradually increasing the cutting edge from the workpiece mounting surface, switching of the cutting edge The notch is formed in an R shape in cross-section, and the punch is pushed by the punch and is compressed and deformed in the process of passing through the concave groove to increase the holding force to the die and eliminate this air to the outside. To suppress the generation of a high repulsive force It is characterized in. Further, by making the groove of the passage surface to be removed in a direction different from the passage direction, a relative movement is generated between the removal tip and the tip of the punch, and the tip of the punch is peeled off when the removal is made. It is easy to make it easy to lock the scraper to the passing surface of the die.

Further, the means for forming the concave groove so that the groove formed on the work material installation surface of the die communicates with the groove formed on the notch of the cutting edge portion and the passing surface of the die is a laser. .

The material of the die may be single crystal diamond, polycrystal diamond (PCD) or cubic boron nitride (CBN).

The workpiece is a lead frame or a connector part manufactured by press punching.

As described above, the anti-fogging device according to the present invention can reliably prevent the hoist from floating up to the punch side during punching, and can perform more stable punching. In addition, this brings about an effect that the trouble of the processing apparatus can be suitably suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 (a) and 1 (b) are views showing a first embodiment of the anti-fogging structure according to the present invention. FIG. 1 (a) shows that a punch 1 is inserted into a die 3 and a new debris 4 is inserted. Indicates the state that occurred. FIG. 1B shows a state in which the punch 1 is inserted into the die 3 up to the bottom dead center. In FIG. 1A, the workpiece 2 is punched with a punch 1 and a die 3. In the die 3, the groove 10 is formed so that the groove 10 </ b> A formed on the workpiece installation surface 8, the notch 10 </ b> B of the cutting edge portion 11, and the groove 10 </ b> C formed on the passing surface 12 are communicated. The depth of the concave groove 10 is gradually increased from the workpiece installation surface 8 and is maximized at the cutting edge portion 11, and is provided so as to gradually decrease toward the discharge port 9 along the passing through surface 12. It is. In practice, the depth of the concave groove 10 is often sufficient when it is 2 to 10 micrometers, and it is desirable to set it appropriately according to the thickness of the workpiece and the state of occurrence of burrs.

Also, in FIG. 1A, 4 is a punch mark immediately after punching, 5 is a punch mark punched one shot before, 6 is a punch mark punched two shots before, 7 is a shot three shots before It is a punch that has been punched. Further, in FIG. 1B, when the punch 1 is inserted into the die 3 to the bottom dead center, the punch 7 punched out three shots before is pushed out sequentially and falls from the discharge port 9 of the die 3. Is in a state of being. In the process from the state shown in FIG. 1A to the state shown in FIG. 1B, the scraper 4 is sequentially pushed into the slipping passage surface 12 of the die 3 by the punch 1 and finally falls from the discharge port 9. In this way, as a result of the punch 4 being pressed by the punch 1 and being compressed and deformed in the process of passing through the concave groove 10, the holding force of the punch 3 to the die 3 increases.

Also, the air 15 interposed between the punch 4 immediately after punching and the punch 5 punched one shot before passes through the concave groove 10 and is preferably excluded to the outside. This is because the groove 10 </ b> A of the workpiece installation surface 8 reaches the outside of the workpiece 2. If the air 15 interposed between the punch 4 immediately after punching and the punch 5 punched one shot before is sealed and compressed by press punching, the strong repulsive force generated Acts as a force to bring the punch 4 into close contact with the punch 1, and when the punch 1 rises from the bottom dead center, the negative pressure generated between the punch 1 and the punch 4 increases, and immediately after being punched. Since the drainage 4 acts as a force for discharging from the passing surface 12 of the die 3, the scumming is likely to occur. For the above reasons, an effective anti-fogging effect can be obtained.

A second embodiment of the anti-raising structure will be described. In FIG. 2, a situation is shown in which a chip 4 punched from the workpiece 2 is pushed into the die along the concave groove 10. Since the groove 10A of the work material installation surface 8 reaches the outside of the work material 2, air permeability is ensured along the groove 10A. Prior to this, when the workpiece 2 is punched next time, the groove 10A is formed with a punch 5 that is locked to the passing surface 12 of the punch 3 and a new punch that is in close contact with the next punch and fits into the die 3. It functions as an air escaping groove interposed between the scum 4 and it is possible to suppress generation of a high repulsive force that promotes scum by excluding this air to the outside.

Further, as shown in FIG. 3, when the concave groove 10 of the die 3 is formed by the laser 13, the irradiation angle, focal area, focal depth, irradiation speed, irradiation energy, etc. of the laser 13 are set in a suitable state. By irradiating 3, each groove 10 </ b> A, notch 10 </ b> B, and groove 10 </ b> C can be easily formed.

4 shows a state in which the groove 13 is formed by irradiating the divided die 3 with the laser 13, but compared with the groove 10 formed in the integrated die 3 shown in FIG. It is possible to irradiate the laser 13 more freely.

Further, in FIG. 5, by adding a configuration in which the groove 10 </ b> C of the passage surface 12 is different from the passage direction, the gap between the passage 4 and the tip of the punch 1 (not shown). It is possible to cause the relative movement of the punch 4 and the tip of the punch 1 to be easily peeled off, and to lock the scraper 4 to the passing surface 12 of the die 3.

A third embodiment of the anti-fogging structure will be described. 5, the configuration is the same as that of FIG. 3, but a plurality of concave grooves 10 are formed in different directions. When punching is performed with the die 3, as the scraper 4 (not shown) is fed toward the discharge port, deformation occurs due to the grooves in the different direction formed on the scraper passage surface 12 of the die 3. The air intervening between the new punch (not shown) which is held on the passing surface 12 of the die 3 with a strong holding force and comes into close contact with the next punch (not shown) and fits into the die 3. Since it is also excluded from the concave groove 10, the synergistic effect can effectively prevent the rising. In this case, needless to say, the irradiation pattern of the laser beam can be arbitrarily set as necessary.

A fourth embodiment of the anti-fogging structure will be described. In FIG. 6, the configuration is the same as that in FIG. 3, but the concave groove 10 forms a stepped groove. When the die 3 is punched, the stepped grooves formed on the passing surface 12 of the die 3 are deformed as the die is sent toward the discharge port, and the die 3 is deformed with a strong holding force. Since air that is held by the passage surface 12 and is in contact with a new punch (not shown) that fits into the die 3 in close contact with the punch (not shown) next time is also excluded from the groove 10. The synergistic effect can effectively prevent the fogging. In this case, needless to say, the irradiation pattern of the laser beam can be arbitrarily set as necessary.

The energy of the laser is easy to set, and if a suitable processing energy condition is set, it is possible to process various shapes such as irregularities without damaging the die. Further, since the laser can be irradiated in a non-contact manner, it can be applied to a finer cutting edge. Although it depends on the die material, it is also possible to machine the groove shape on the cemented carbide die with a laser marking device. Furthermore, due to the straightness characteristic of the laser beam, there is an advantage that the focusing with the workpiece and the determination of the processing position are easier than the conventional processing method.

Next, referring to FIG. 7, a fifth embodiment of the anti-raising structure will be described. In FIG. 7, the material of the die 3 is single crystal diamond, polycrystalline diamond (PCD) or cubic boron nitride (CBN), and the other structure is the same as that of the first embodiment. In this case, if the die 3 is partially, that is, only the upper portion 17 is made of single crystal diamond, polycrystal diamond (PCD) or cubic boron nitride (CBN), the material cost can be improved. In recent years, since the work materials have become harder, punches and dies have been made harder due to the need to reduce mold maintenance man-hours. Single crystal diamond, polycrystalline diamond, and cubic boron nitride It has been put to practical use as a high-hardness material higher than cemented carbide and ceramics. There are single crystals and polycrystals in diamond. Since single crystal diamond is a non-conductive material, it is difficult to form grooves by wire-cut discharge or sculpting discharge, but the method shown in FIGS. The concave groove 10 can be efficiently formed by a laser. On the other hand, polycrystalline diamond and cubic boron nitride have conductivity by being mixed with a conductive material and can form grooves by wire-cut discharge or sculpting discharge. In addition, the groove 10 can be efficiently formed by a laser by the method shown in FIGS.

Next, referring to FIG. 8, a sixth embodiment of the anti-fogging structure will be described. Single crystal diamond, polycrystalline diamond, and cubic boron nitride are expensive materials. In particular, since single crystal diamond is difficult to produce a large material, when it is used for a die 3 or a punch, the upper 17 It is economical to bond single crystal diamond, polycrystalline diamond, or cubic boron nitride only to a necessary portion by brazing or the like and form the cutting edge portion 11. Therefore, as shown in FIG. 8A, a plurality of suitable protrusions 10A1, 10B1, and 10C1 are formed in the die 3 portion, and single crystal diamond, polycrystalline diamond, or cubic nitriding is formed only at a necessary portion around the protrusion. Boron is bonded by brazing or the like, and after forming the cutting edge, as shown in FIG. 8B, the groove 10A, the notch 10B, or the groove 10C is formed so as to appear as shown in FIG. It is possible to obtain the same anti-fogging effect as in the case of the laser in the fifth embodiment.

It is sectional drawing which shows 1st Example of the raising prevention structure by this invention. It is a perspective view which shows 2nd Example of the raising prevention structure by this invention. It is a perspective view which shows the formation method of the raising prevention structure by this invention. It is a perspective view which shows the other formation method of the raising prevention structure by this invention. It is a perspective view which shows 3rd Example of the raising prevention structure by this invention. It is a perspective view which shows 4th Example of the raising prevention structure by this invention. It is sectional drawing which shows 5th Example of the raising prevention structure by this invention. It is sectional drawing which shows 6th Example of the raising prevention structure by this invention. It is a cross-sectional perspective view showing a state immediately after a punch and a die punch a workpiece, of a punching die. It is a perspective view which shows the raising prevention structure in patent document 1. FIG. It is sectional drawing which shows the raising prevention structure in patent document 1. FIG. It is sectional drawing which shows the raising prevention structure in patent document 2. FIG. It is sectional drawing which shows the effect | action of the raising prevention structure in patent document 2. FIG. It is sectional drawing which shows the raising prevention structure in patent document 3. FIG. It is sectional drawing which shows the effect | action of the raising prevention structure in patent document 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Punch 2 Work material 3 Die 4 Blanking material 8 Work material installation surface 9 Discharge port 10 Concave groove 11 Cutting edge portion 12 Blanking surface 13 Laser

Claims (4)

In the press punching die of the work material, the groove formed on the work material installation surface and the notch of the cutting edge and the groove formed in a direction different from the passing direction of the cutting edge are communicated with each other. A groove is formed, and this concave groove becomes an air escape groove interposed between a new squeeze that is in close contact with the punch and fitted into the die when this staking is locked to the passage surface of the dies. the depth of the groove so as to form so as to decrease gradually toward the dregs passage area punching becomes maximum at the notch gradually increasing the cutting edge from the workpiece mounting surface, the cross section notches cutting edge Formed in a R shape, and the punching press is pressed by a punch and is compressed and deformed in the process of passing through the concave groove to increase the holding force of the punching to the die. Raise prevention device.   2. The press-up process anti-fogging apparatus according to claim 1, wherein the method of forming the concave groove is a laser.   The material of the die is one of single crystal diamond, polycrystalline diamond (PCD), or cubic boron nitride (CBN). The anti-fogging device for press punching according to any one item.   4. The press blanking prevention apparatus according to claim 1, wherein the workpiece is a lead frame or a connector part manufactured by press punching.

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