JPH0733418U - Die for punching - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is capable of maintaining a predetermined clearance without remanufacturing a stripper plate or additional machining of a die, thereby extending the life of a mold and improving its quality. The purpose is to [Structure] The punching die of the present invention is configured by providing a reinforcing member 8 at a position deviated from a position where the cutting blade effective portion 7 of the punching punch 1 engages with the engaging hole 5 of the die 4. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a die for punching, and in particular, a die for punching which can secure a predetermined clearance without re-manufacturing a punch and additional machining of a die, which has a long life of the die and an improved quality. Regarding molds.

[0002]

[Prior art]

 As a conventional punching die, for example, there is one shown in FIG. This punching die is a punch plate (not shown) supported by a driving device such as a cylinder mechanism, a punching punch 1 that is fixed to a punch plate and moves up and down, and guides up and down movement of the punching punch 1. It comprises a stripper plate 2 having a guide hole 3 and a die 4 which cooperates with the punching punch 1 to punch a plate-shaped member (not shown).

The punching punch 1 is, as shown in FIGS. 4A, 4B, and 4C, a base portion 1A having a key groove 11 for fixing to the punch plate, and extended from the base portion 1A. It is configured by including a thin plate-shaped cutting blade effective portion 7 and a blade portion 7A provided on the peripheral edge of the tip of the cutting blade effective portion 7.

The cutting edge effective portion 7 is configured to move up and down while penetrating the guide hole 3 of the stripper plate 2, and when descending, the engaging hole 5 of the die 4 is moved by a predetermined length from the blade portion 7 A at the tip. The plate-shaped member located on the die 4 is punched out by the cooperation of the blade portion 5A provided on the upper peripheral edge of the engagement hole 5 and the blade portion 7A of the cutting blade effective portion 7 in cooperation with each other. .

On the other hand, at the time of punching, when the punching punch 1 is in a state as shown in FIG. 5, that is, when the cutting blade effective portion 7 is curved and deformed as shown by a dotted line, as shown in FIG. The part 7 may come into contact with the side surface of the guide hole 3 of the stripper plate 2, and the shape of the guide hole 3 may be deformed due to friction between the two. When such a phenomenon occurs, the punching punch 1 and the die 4 collide with each other due to the influence of the deformation amount α, or the clearances between the punching punch 1 and the die 4 become non-uniform, and the cutting edge effective portion 7 or the edge of the punching hole 5 is affected. There was a risk of chipping.

Therefore, at present, the problem of chipping is dealt with by increasing the clearance by remanufacturing the stripper plate 2 or by additionally machining the die 4. Also, as a measure to prevent this problem, during the punching punch production process, the grinding conditions, that is, the selection of grinding wheel, wheel rotation speed, grinding wheel axis stroke, cutting depth, etc., are taken into consideration. ing.

[0007]

[Problems to be solved by the device]

 However, according to the conventional die for punching, if chipping occurs in the effective part of the cutting edge or the edge part of the engaging hole, it is necessary to re-manufacture the stripper plate or additionally process the die. In addition to the complicated work, there is a problem that delivery time will be long and cost will be increased. In addition, when a die is additionally machined, punching burrs and punching sagging become noticeable on the product, and there is a problem that quality deterioration cannot be avoided. Furthermore, even if the punching punch is remanufactured, the guide hole of the stripper plate has already been deformed, so the punching punch is not guided and may be damaged due to shake or the like due to vibration during punching. .

On the other hand, even when considering the selection of the grinding conditions in the manufacturing stage of the punching punch, when the punching tool is deformed by heat due to the grinding process, or when the punch support is released, the stress inside the punch is released and the punching punch bends. As a result, the same problems as above will occur.

Therefore, the object of the present invention is to maintain a predetermined clearance without re-manufacturing the stripper plate or additional machining of the die, which can extend the life of the mold and improve the quality. It is to provide a die for punching.

[0010]

[Means for Solving the Problems]

 In view of the above problems, the present invention can maintain a predetermined clearance without remanufacturing a punching punch or additional machining of a die. Provided is a punching die in which a reinforcing member is provided at a position deviated from a position where a cutting edge effective portion of a punch engages with an engaging hole of a die.

The cutting edge effective portion is composed of a thin plate member for punching between the leads of the lead frame, and the reinforcing member is formed on both surfaces of the thin plate member with a predetermined thickness. Moreover, it is preferable to form a reinforcing member passage portion having a shape corresponding to the cross-sectional shape of the reinforcing member in the guide hole of the stripper plate.

[0012]

【Example】

 Hereinafter, the punching die of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a perspective structure of a punching die according to an embodiment of the present invention. In this figure, the same parts as those in FIG. 3 are designated by the same reference numerals and symbols, and a duplicate description will be omitted here.

This punching die has a convex portion 8 as a reinforcing member at a position separated by a predetermined distance from the tip of the cutting blade effective portion 7 of the punching punch 1, and a guide hole 3 of the stripper plate 2. And a passing portion 3A corresponding to the convex portion 8 of the cutting blade effective portion 7 is formed in each.

FIG. 2 shows the punching punch 1 in detail. As can be seen from this figure, a convex portion 8 having a predetermined thickness is formed on both sides of the base portion 1A from a position separated from the blade portion 7A at the tip of the cutting blade effective portion 7 by a predetermined distance l. The cutting edge effective portion 7 is reinforced.

In the above structure, when the punching punch 1 is lowered by a driving mechanism such as a cylinder mechanism for driving the punching plate, the punching punch 1 has its cutting edge effective portion 7 guided by the guide hole 3 of the stripper plate 2. The blade 7A at the tip is engaged with the engaging hole 5 of the die 4 for a predetermined length, and the blade 7A of the cutting blade effective portion 7 and the blade 5A of the engaging hole 5 are provided between the die 4 and the stripper plate 2. A plate-shaped member (not shown) located at is punched into a narrow groove.

At the time of punching, the punching punch 1 does not bend as shown in FIG. 5 because the cutting edge effective portion 7 is reinforced by the convex portions 8 formed on both surfaces thereof. Therefore, the guide hole 3 is not deformed by the punching punch 1, the clearance between the punch 1 and the die 4 can be maintained in a uniform state, and the cutting edge effective portion 7 and the blade portion 7A of the engaging hole 5 can be maintained. , Or 5A chipping can be prevented. Further, since it is not necessary to re-manufacture the stripper plate 2 and the additional machining of the die 4, punching burrs, punching sagging, etc. are eliminated and the quality of the product can be stabilized.

Further, since the punching punch 1 is guided by the guide hole 3 of the stripper plate 2 only by the projecting portion 3A of the guide hole 3 and the convex portion 8 of the effective cutting edge portion 9, the guide hole 3 is cut by the cutting edge. The effective portion 7 can be largely released, the side surface of the punching punch 1 does not contact the side surface of the guide hole 3, and as a result, the punching punch 1 and the die 4 can be accurately aligned, and the punching is performed. The accuracy can be improved.

In the embodiment described above, the punching punch is a thin plate-like punching punch between the leads of the lead frame. However, the punching punch is not limited to this as long as it has a curved shape during punching. The shape of the tip of the punch may be more complicated, or the shape of the diver cut may be required to be precise.

[0020]

[Effect of device]

 As described above, according to the punching die of the present invention, since the reinforcing member is provided at a position deviated from the position where it engages with the engaging hole of the die of the cutting blade effective portion of the punching punch, the punching punch is remanufactured. Predetermined clearance can be maintained without additional machining of the die and die, which makes it possible to extend the life of the die and improve its quality.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a punching punch according to an embodiment.

FIG. 3 is a perspective view showing a conventional punching die.

FIG. 4 is an explanatory view showing a punching punch of a conventional die for punching.

FIG. 5 is an explanatory view showing a state of a conventional die for punching during punching.

FIG. 6 is an explanatory view showing a state of a conventional die for punching during punching.

[Explanation of symbols]

1 Punching Punch 1A Base 2 Stripper Plate 3 Guide Hole 3A Projection 4 Die 5 Engagement Hole 5A Blade 7 Cutting Blade Effective 7A Blade 8 Convex

Claims (3)

[Scope of utility model registration request] 1. A punching punch composed of a base portion supported by a driving member and guided by a guide hole of a stripper plate, a cutting blade effective portion having a blade portion at its tip, and the punching punch descended. At this time, the cutting blade effective portion comprises a die having an engaging hole that engages for a predetermined length,
In a punching die for punching a plate-shaped member into a predetermined shape by engaging the engaging hole of the cutting blade effective portion by lowering of the punching punch, the punching punch is the predetermined portion of the cutting blade effective portion. A die for punching, wherein a reinforcing member is provided at a position deviated from the length of the die. 2. The cutting edge effective portion is composed of a thin plate-shaped member for punching between the leads of a lead frame, and the reinforcing member is formed on both surfaces of the thin plate-shaped member with a predetermined thickness. A die for punching according to claim 1. 3. The punching die according to claim 1, wherein the guide hole has a reinforcing member passage portion having a shape corresponding to a cross-sectional shape of the reinforcing member.