JPS6327160B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for processing a punch blade of a perforator for punching holes in paper or the like. More specifically, a plate-shaped metal member is formed into a cylindrical shape by punching and drawing by press work, a mounting part is provided at one end, and a strong iron is applied to the outer periphery of the cutting edge formed at the other end. A hard overhang is provided by work hardening by drawing. To provide a method for processing a punch blade of a perforator, which saves materials and labor, is inexpensive, can be mass-produced, and has excellent punching ability.

[Prior Art] The punch blade conventionally used in this type of punch is as shown in Fig. 1, in which a metal round bar 1 is machined on a lathe, and then the other end of the round bar 1 is machined on a milling machine. The cutting edge 2 is then formed by cutting, and the cutting edge 2 is polished if necessary. In addition, special public service in 1977-
Publication No. 48076 does not include a punch blade, but it does include paper, cloth,
It is used to make holes in vinyl paper, etc., and is described as a cylindrical perforating knife made from a metal plate with a plurality of acute-angled chevron-shaped blades at the tip.

[Problems to be Solved by the Invention] For this reason, conventional punch blades require cutting with a lathe, milling machine, etc., and then grinding, which requires multiple steps such as the use of machine tools, and makes mass production difficult. It had a few shortcomings. As a result, this has become a factor in increasing costs. In addition, the method of processing a cylindrical perforation blade described in Japanese Patent Publication No. 47-48076 uses sheet metal material, but the cutting edge is usually formed by grinding, which has the disadvantage of requiring many steps and poor productivity. .

The object of the present invention is to eliminate these conventional drawbacks, reduce materials and labor, and provide an inexpensive and excellent method for processing punch blades.

[Means for Solving the Problems] The present invention takes the following measures to solve the above problems.

In a method for processing a punch blade having a cylindrical shape and having a corrugated cutting edge consisting of a top and a trough and an overhanging part on the entire outermost periphery of the cutting edge, a plate-shaped metal member is used. A step of forming a punch blade material having a burr formed on its outer periphery by punching it into a polygon, and drawing the punch blade material with a die and a punch so that the corner part of the metal member is the top of the punch blade and the straight part is formed. A method for processing a punch blade in a perforator, comprising the steps of forming a trough and applying ironing during drawing of the die and punch to form the burr into an overhang.

[Function of the embodiment] The function of the embodiment of the present invention is as follows. A punch blade material 10 with a burr 11 formed on the outer periphery is formed by punching a plate-shaped metal member into a polygonal shape, and the punch blade material 10 is drawn using a die and a punch to form a polygonal shape of the metal member. This is a method of processing a punch blade in which the corner part is used as the top part 7 of the punch blade, the straight part is used as the trough part 8, and the burr part 11 is made into the overhang part 9 by ironing during drawing between the die and the punch.

[Example] Hereinafter, a punch blade processing method according to the present invention will be explained in detail with reference to FIGS. 2 to 6. Figure 2 shows the shape formed by the drawing process of the press operation.
Punch blade 3 manufactured by the processing method of the present invention
FIG. 3 is a longitudinal cross-sectional view of the same. In the figure, 4 is a cylindrical portion, 5 is a cutting edge portion, and 6 is a mounting portion for fixing the punch blade. The cutting edge portion 5 has four top portions 7,
It consists of four troughs 8, and as shown in FIG. 3, the outer periphery of the cutting edge 5 is provided with an overhang 9 whose hardness has been strengthened by work hardening associated with the drawing process.

Next, the processing method of the present invention will be explained. Figure 4 shows
A punch blade material 10 is formed by continuous punching from a plate-shaped metal member (not shown). This punching process is performed using a normal processing method. Attachment portions 6 are formed at the same time as punching of this punch blade material 10, or before and after punching. The attachment portion 6 is for fixing the punch blade 3. Figure 5 is the 4th
In the cross-sectional view shown in the figure, a burr (burr) 11 that is produced when punching and forming a metal member is formed on the lower outer periphery. This varies depending on the punching method. Note that the punch blade material 10 may be formed by subjecting a metal member to a slitting process or the like.

When the punch blade material 10 that has been punched and formed is held in the state shown in FIG. 5 by supporting its lower surface with a die and drawing is performed by pushing a punch from above, the punch blade 3 shown in FIG. 2 is formed (not shown). . As a result, the four corners 12 of the square in FIG.
The four straight line portions 43 form the smooth curved valley portion 8. At this time, the burr part 11 of the punch blade material 10 is located on the outer periphery of the cutting edge part 5, so the cutting edge is sharp and suitable for punching paper. By appropriately selecting and squeezing,
Plastic flow is generated on the outer periphery of the cutting edge portion 5, and an overhanging portion 9 shown in FIG. 3 is formed.

Since this overhanging portion 9 is work-hardened, the punching operation when punching the paper becomes even better, and the efficiency of the punching operation is improved in the factory.

Processing Examples and Usage Examples of Punch Blade Below, processing examples and usage examples of the punch blade 3 manufactured by the processing method of the present invention will be shown. FIG. 6 shows a state in which the punch blade 3 manufactured by the processing method of the present invention is attached to a stapler 42 with a punch. This stapler with punch 42 is a conventionally known stapler with a punch blade 3 manufactured by the processing method of the present invention, so that paper binding and punching can be performed separately. A base 15 is provided with a punch hole 13 and a paper insertion port 14 on the upper surface, and above the base 15, a punch blade 3 manufactured by the processing method of the present invention shown in FIG. 2 is attached to the lower surface and pressed against the front end. Frame 1 forming part 16
7 and a handle 19 provided with a finger rest 18 at the front end are rotatably pivoted by a shaft 20 at the rear.

To perform punching work with this stapler with punch 42, after inserting the paper into the insertion slot 14, push down the pressing parts 16 at all ends of the frame 17. As the frame 17 descends, the punch blade 3 descends. ,
A paper sheet (not shown) inserted into the insertion port 14 can be perforated. During this perforation, the top 7 of the punch blade 3 is formed at an extremely acute angle, so it bites into the paper more strongly than conventional punch blades 3, and the outer periphery of the tip of the punch blade 3 has a work-hardened surface. Since the overhanging part 9 is formed, the perforation is good, and therefore, compared to the conventional punch blade 3,
Reliable drilling can be performed with less force.

Next, the second processing example and usage example shown in FIGS. 7 and 8 will be explained. The punch blade 3 in FIG. 7 uses a triangular punch blade material (not shown) as the first
It was formed by drawing as in the example,
The cutting edge portion 5 is provided with three top portions 7 and three trough portions 8, and the mounting portion 6 is provided with a through hole 21.

FIG. 8 shows the punch blade 3 shown in FIG. 7 attached to a pliers type perforator 22 with a part cut out. The hole 21 is fitted and caulked, and by tightening the handle 23, the punch blade 3 and the punch hole 25 are attached.
It is possible to perforate the paper inserted between the The perforation effect is the same as that of the first usage example, so a description thereof will be omitted.

Next, a third usage example shown in FIG. 9 will be explained. Figure 9 shows a punch file for storing documents.
It is equipped with a punch blade 3 manufactured by the processing method of the present invention, and has the functions of punching and binding documents to be filed, and can punch holes with a single touch.
It allows you to bind the necessary documents,
It is used by being fixed to a file cover (not shown).

This punch file 26 has a main body integrally molded from a synthetic resin material, and includes an L-shaped base 27, a binding pin 28, a tilting plate 29 provided with a punch hole 13,
In addition, the hinge portion 30 is integrally molded, and the punch blade 3 of the present invention is attached to the upper end of the binding pin 28 by riveting, fitting, insert molding, or the like.

In use, place the documents to be bound on the two punch blades 3, press the top surface while tilting the tilting plate 29 forward, and the punch blades 3 punch while perforating the paper of the document. Insert into hole 13,
The document is filed by the binding pin 28. It goes without saying that the tilting plate 29 is provided with a punch waste storage device and a device that prevents the tilting plate from rotating upwards unnecessarily.

Next, to explain the fourth processing example and usage example shown in FIGS. 10 and 11, the punch blade 3 in FIG. It is processed into a long cylindrical shape, with two through holes 31 provided at the top. FIG. 11 shows a punch hole 33 in which the punch blade 3 is fitted into a base 32, in which the punch blade 3 is attached to a commonly used punching device.
A frame 34 is provided above the base 32 so as to be parallel to the base 32. An operating handle 35 is supported by a pivot 36 on this frame 34 so that it can freely move up and down, and a punch blade 3 is attached to the center of the frame 34 through a shaft 37 so as to be able to move up and down vertically. There is. In this state, if paper is inserted into the insertion slot 38 and the operating handle 35 is pressed, the punch blade 3 can punch holes in the paper.

Next, the punch blade 3 shown in FIG. 12 is formed by drawing a gear-shaped punch blade material into a cylindrical shape, and has a number of triangular cutting edges 39 on the lower side. The punch blade 3 shown in Fig. 13 is used when punching square holes in paper, so
The punch blade material, which is almost the same as shown in Fig. 4, is drawn into a rectangular cylindrical shape.The functions and effects of each of the above usage examples are the same as those of the first usage example, so explanations are omitted. do.

Although preferred embodiments of the punch blade manufactured by the processing method of the present invention have been described above, various design changes can be made to the drawing method, shape, etc. without departing from the spirit of the present invention. Of course.

[Effects of the Invention] As described in detail above, the punch blade processing method of the present invention manufactures a plate-shaped metal member by punching and drawing using a press operation, thereby saving on materials, which is a characteristic of press processing. In addition to making full use of the cost reduction effect due to labor saving, the cutting edge part becomes hard due to work hardening that occurs during the manufacturing process, and the drilling ability is improved due to the forming effect of the overhanging part 9 etc. that occurs due to particularly strong squeezing. It has excellent advantages such as being able to

This punch blade can be used not only for punching documents and cards, but also for punching leather, plastic, etc.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional punch blade, Fig. 2 is a perspective view of a punch blade processed by the processing method of the present invention, Fig. 3 is a cross-sectional view thereof, and Fig. 4 is a plan view of the punch blade material. 5 is a sectional view of the same, FIG. 6 is a partially cutaway side view of the punch-stapler in the first usage example equipped with a punch blade processed by the processing method of the present invention, and FIG. The figure is a perspective view of the punch blade in another processing example, Figure 8 is a partially cutaway side view of the same pliers type perforator, and Figure 9 is the punch blade attached to the punch file in another usage example. FIG. 10 is a perspective view showing another shape of the punch blade, FIG. 11 is a sectional view of a perforator equipped with the same punch blade, and FIGS. 12 and 13 are perspective views of punch blades of other shapes. It is a diagram. 3...Punch blade, 4...Cylindrical part, 5...Blade tip part, 6...
Mounting part, 7...top, 8...trough, 9...overhanging part, 1
0... Punch blade material, 11... Burr portion, 13... Punch hole, 31... Through hole, 39... Triangular cutting edge portion.

Claims (1)

[Claims] 1. In a method for processing a punch blade having a cylindrical shape and having a corrugated cutting edge consisting of a top and a trough, and an overhanging part on the entire outermost periphery of the cutting edge, a plate-shaped metal member is used. A step of punching out a polygonal shape to form a punch blade material with a burr formed on the outer periphery, and drawing the punch blade material with a die and a punch to make the corner part of the metal member the top of the punch blade and the straight part. 1. A method for processing a punch blade in a perforator, comprising the step of forming the burrs into troughs and applying ironing during drawing of the die and punch to form the burrs into overhangs.