JP2000024999A - Die for rotary punch and rotary punch unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with the joining process by forming a die with a shaft fixing part fixed to a shaft, and a die hole part extended in the axial direction of the shaft from the shaft fixing part and having a die hole, and forming the die with a sintered integrated body of the powder. SOLUTION: A die for rotary punch comprises a shaft fixing part 1 fixed to a shaft and a die part extended in the axial direction from the shaft fixing part 1 and having a die hole 2, and is manufactured through the injection molding of the alloy powder having the components corresponding to the high speed tool steel, the sintering, the annealing, the trimming, the quench-and-temper, the finish polishing or the like. In a rotary punch unit, two parallel rotary shafts are connected by a pair of circumscribing gears of equal teeth number mounted outside of a housing which rotatably supports two rotary shafts, and rotated and driven by a driving part mounted at a right side of the shaft. A pair of punches made of high speed tool steel are mounted and fixed to one of the shafts, and a pair of rotary punch dies corresponding to the punch are mounted and fixed on the other shaft at the shaft fixing part 1 with the positional relationship for engaging the rotary shafts by the synchronous rotation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary punch unit for perforating one or a plurality of binding holes in a sheet material (hereinafter also referred to as paper) such as paper or synthetic resin film, and more particularly to the above-mentioned die. Things.

[0002]

2. Description of the Related Art When filing a sheet material such as a copied sheet, it is necessary to punch a binding hole. Conventionally, as a method of punching the binding hole, the ends of a plurality of copied sheets are manually inserted. A method of perforating with an aligning and punching machine (such as a manual punch) is often used. The method of punching manually using a punching machine is troublesome, such as manually aligning the edges of the paper or confirming the punching position.In recent years, by incorporating a punching device inside a copy machine or the like, There has been a demand for punching in parallel with copying. One of the punching methods is a rotary punch unit. The rotary punch unit has a die mounted on one of a pair of shafts that rotate synchronously in opposite directions, and a punch mounted on the other, for example, as shown in FIG. 3 of JP-A-7-9394. The punching operation is performed on the sheet material meshed by the synchronous rotation and supplied between the both shafts.

[0003]

In general, the above-mentioned dies are designed to prevent irregular scattering of drilling debris, as shown in FIG.
As shown in (b), an integral type made of metal (a) or an assembled type (b) of a metal part (a) and a part (b) of plastic or the like
In many cases, the whole is formed into a cup-like shape so that the drilling dust is discharged from the opening at one end in the axial direction. Further, as an example of the above assembly type (b), (b) both the shaft fixing portion and the die portion, which are separated by a broken line (c) in the drawing, are used for tool steel or the like in terms of drilling performance and durability performance. High-grade materials, the former being made of low-grade materials, and both being joined by welding, brazing, etc., to reduce the cost as compared with the case where the whole is made of high-grade materials.

[0004] However, this joining method requires a joining process in addition to the cutting process by mechanical processing of both members, so that it is not possible to reduce the cost significantly. Further, due to the thermal influence of brazing or the like, the die portion is not formed. There are drawbacks such as a decrease in hardness. The present invention provides a rotary punch die or a rotary punch unit using this die, which can further reduce cost and has no problem of hardness reduction due to bonding, instead of the conventional bonding method. The purpose is to provide.

[0005]

Means for Solving the Problems The present inventor has made various studies for the purpose of making it possible to further reduce the cost as compared with the conventional joining method while preventing the above-mentioned decrease in hardness.
As a result, it was found that a method based on sintering of powder was most suitable for this purpose. According to this method, even if the whole is made of a high-grade material, it has been found that the above object can be sufficiently achieved, and it is particularly advantageous in the case of mass production.

That is, for example, a method of kneading a metal powder with a suitable binder, injecting it into a mold and molding, and then sintering the molded article is a method for producing a complex three-dimensional article with a near net. Since it can be obtained in a shape, the amount of finishing work can be minimized, the cost can be reduced, and there is no decrease in hardness due to thermal effects because joining is not performed by welding or the like. The binder removal process is required prior to the sintering of the powder, but this process requires a sudden increase in the processing time when the wall thickness exceeds a certain level, but the die of the present invention is used for sheet materials such as paper. In the case of (1), since the maximum thickness can be easily reduced to about 5 mm or less, the binder removal processing does not require a long time.

That is, in the present invention, a die is mounted on one of a pair of shafts that rotate synchronously in opposite directions to each other, and a punch is mounted on the other, and the die and the punch are meshed by the synchronous rotation and supplied between the two shafts. In the die for a rotary punch that is punched in a sheet material, the die includes a shaft fixing portion fixed to the shaft and a die portion extending in the axial direction of the shaft from the shaft fixing portion and having a die hole, and The die is a rotary punch die characterized in that it is an integrated sintered product of powder, and a rotary punch unit characterized by combining the die with a punch made of high-speed tool steel. In the die of the present invention, ceramics, cermets and the like are also useful, but from the viewpoint of chipping resistance, it is desirable to use a metal or alloy such as various tool steels such as high-speed tool steel. Also, it is desirable that the punch as the mating tool be made of substantially the same metal (melted or powder sintered material) for substantially the same reason.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A die having the shape shown in FIG. 1 was obtained by injection molding of an alloy powder having a component equivalent to JIS SKH51 high-speed tool steel into a mold and sintering. Subsequently, the obtained product was annealed, and then finished, for example, by a finishing process, a quenching and tempering process, and a polishing finish (including a polishing hand finish). As shown in FIG. 1, the finished product is provided with a thinned portion 1 'to prevent waste and suppress the increase in the maximum thickness. As a result, the weight of the finished product is reduced to about 90% of that of the conventional die of the joining type. Lighter weight. In addition, the finished product has almost the same finishing accuracy as the conventional bonded dies, and has a piercing performance and durability equal to or higher than the conventional bonded dies by a piercing test combined with a SKH51 equivalent punch. It was confirmed. In some cases, the flywheel effect may be reduced due to the reduction in the weight of the die, and drilling may become unstable.In this case, it is necessary to increase the unit weight while suppressing an excessive increase in the maximum wall thickness, This can be achieved by, for example, fixing a disc made of steel on an axis near the die or the like.

Next, an embodiment of a rotary punch unit using the die of the present invention will be described. In FIG. 3, two parallel rotating shafts 4 and 5 are rotatably supported by housings 6 and 7, respectively, and connected by a pair of external gears 8 and 9 having the same number of teeth outside the housings 6 and 7. Then, the shaft 5 is rotatably driven by a driving unit (not shown) on the right end side of the shaft 5 so as to be capable of synchronous rotation. On one shaft 4 are punches 10a, 10 made of high-speed tool steel.
b, the other shaft 5 is provided with dies 11a and 11b of the present invention corresponding to the punch, and has a positional relationship such that the dies 11a and 11b mesh with each other by synchronous rotation of the rotating shafts 4 and 5. In this embodiment, two pairs of the punch 10 and the die 11 are used, but one pair or three or more pairs may be used.

[0010]

As described above, since the die of the present invention is formed by sintering and integrating the powder, the number of joining steps is unnecessary and the cost can be reduced as a result. In particular, in the case of mass production, the joining process and the automatic machining of both members to be joined are complicated, and various kinds of cams and jigs for an automatic machining machine are required, so that a large investment is required. On the other hand, in the injection molding method, even if there are many types of dies, it can be dealt with simply by preparing a molding die for each. Furthermore,
According to the present invention, a high-quality product can be obtained without the heat effect caused by joining.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing one embodiment of the present invention.

FIG. 3 is a view showing one embodiment of a rotary punch unit using the die of the present invention.

[Explanation of symbols]

1 Axis fixed part, 1 'squeeze part, 2 dice part, (A)
Metal parts, (b) plastic parts, 4 rotating shafts, 5 rotating shafts, 6 housings, 7 housings, 8 gears, 9
Gear, 10a punch, 10b punch, 11a dice, 11b dice

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kazuma Yuasa 1240-2, Iijima-cho, Yasugi-shi, Shimane Prefecture Hat Co., Ltd. F-term (reference) 3C060 AA01 AA04 AA20 BA01 BB20 BC03

Claims (2)

[Claims] 1. A die is mounted on one of a pair of shafts that rotate synchronously in opposite directions to each other, and a punch is mounted on the other, and the die and the punch engage with each other by the synchronous rotation to form a sheet material supplied between the shafts. In the rotary punch die for punching, the die includes a shaft fixing portion fixed to the shaft and a die portion extending in the axial direction of the shaft from the shaft fixing portion and having a die hole, and the die is Dies for rotary punches, characterized by being a powder sintered product. 2. A rotary punch unit comprising the die of claim 1 and a punch made of high-speed tool steel.