JPH11319982A - Production of grinding plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a grinding plate, in which a cutting edge protrudes around a through hole pierced in a main body with one time press working. SOLUTION: In punching a thick metal plate 1a, a recessed part corresponding to a grinding cutting edge of a grinding plate to be formed is formed to an upper edge of a punching die 4. By a punch 5, in which a tip part is a burring part 51 and a base part is coining part 52, a plate for grinding plate is punched so as to leave a burring part as well as to push in the burring part into the recessed part to form a cutting edge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a grater for cooking and a grinder such as a file for cutting soft materials such as plastic and gypsum board.

[0002]

2. Description of the Related Art As a metal cooking grater, a thin metal plate is formed by star-shaped punching, a circular hole is formed, and a triangular protruding plate is formed at an edge of the circular hole. It is known that the surface is cut and raised with a ragged shape to form cutting projections.

[0003] However, the former is low in cutting ability and inferior in durability, and the latter is high in cutting ability and excellent in durability, but when used, food fibers are caught on the projections. There is a drawback, and in the production thereof, the process of making the projection gouge must be repeated several times, which is very complicated.

Therefore, when forming a through hole in a grinding plate by the fine blanking method, the concave shape corresponding to the projection shape of the plate holder is made to correspond to the cutting blade shape to be formed, and the through hole is punched. At the same time, a manufacturing means for forming a cutting blade protruding from a hole edge was proposed (Japanese Patent Publication No.
-85814).

[0005]

When the above-mentioned fine blanking method is employed, it is necessary to extrude the material to the portion where the grinding blade is formed by the pressing pressure of the plate holder. Is limited to soft materials such as aluminum alloys. In addition, the rear edge of the through hole of the produced grinding plate has an irregular shape, and the appearance as a product is not always good. Therefore, the present invention proposes a new means for manufacturing a grinding blade by ordinary punching.

[0006]

According to a method of manufacturing a grinding plate according to the present invention, a concave portion corresponding to a grinding blade shape of a grinding plate to be formed is provided on an upper edge of a die for punching, and a punch is formed with a front end portion. Along with a large clearance as a burring part, a coining part is formed to continuously push and expand the inner end face, and a sheet material for a grinding plate made of a thick metal plate is punched out so that the burring part remains, and then further punched And a grinding blade is formed at the burring portion.

That is, when a grinding plate is punched with a punch, a through-hole is first formed leaving a burring portion, and the burring portion is pushed and expanded by the progress of the punch, and the burring portion escapes to a concave portion of the die. At the end of the punching process, a grinding blade formed by press-fitting the concave portion around the through hole is produced.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described with reference to an example of a grater. As shown in FIGS. 1 and 2, the grater is formed by forming a large number of through-holes 2 in a main body 1 made of a thick metal plate and projecting the edge of each through-hole 2 into a mountain shape.
According to the present invention, the cutting blade 3 is formed simultaneously with the punching of the through hole 2.

A press working device used for punching the through hole 2 basically has a die 4 and a punch 5 as in the prior art. A concave portion 42 corresponding to the protruding shape of the grinding blade 3 to be formed is provided. On the other hand, the punch 5 has a burring portion 51 at the tip end and a coining portion 52 at the base side. The burring section 51 has a clearance for obtaining a predetermined burring amount (burring height) with respect to the processing hole 41 of the die 4, and the coining section 52 eventually results in the processing hole 41 of the die 4. A clearance that does not generate a burring portion is provided. In particular, a portion corresponding to the concave portion 42 is a tapered surface that pushes the burring portion into the concave portion 42.

As shown in FIGS. 3 and 4, when the through-hole 2 is punched and formed in the thick metal plate 1a to be the main body 1 of the grater by the press working device, a punch 5 is formed.
In the burring processing portion 51, a protruding member (burring portion) a corresponding to burring is left on the main body 1 side, and the remaining material b
Are punched out (FIG. 3). When the punch 5 is further advanced, the punching hole is pushed and expanded by the coining portion 52, and the burring portion a is pushed into the concave portion 41 of the die 4, and the grinding blade 3 is formed by being surely pushed into the concave portion 41 particularly at the tapered portion. Things.

Accordingly, in one operation of the punch 5, the through hole 2 is formed in the main body 1 and the cutting blade 3 is formed at the edge of the through hole 2. Note that the present invention is not limited to the grater as shown in the above embodiment, but can be applied to, for example, a file for cutting a soft material such as plastic and gypsum board, and all other plate-like ground bodies. .

[0012]

According to the present invention, when a grinding plate is manufactured by using a thick metal plate as described above, in the case of punching a thick metal plate,
In particular, on the upper edge of the die for punching, a recess corresponding to the grinding blade shape of the grinding plate to be formed is provided, the tip is a burring part, and the base is a coining part. The burring part is pressed into the recess at the same time as the burring part is punched out, and the through hole is punched out and the cutting blade protruding from the hole edge is formed with only one ordinary press process, and has excellent grinding ability. In addition, the manufacture of an easy-to-use grinding plate is facilitated.

[Brief description of the drawings]

FIG. 1 is a partial plan view of an embodiment of a grinding plate produced by the method of the present invention.

FIG. 2 is an enlarged perspective view of the grinding blade portion.

FIG. 3 shows a punching step of the method of the present invention (a).
Indicates the punching process, (b) indicates the punching process, and (c) indicates immediately after the punching.

FIG. 4 is an explanatory view of the punching step, wherein (d) shows a state after burring and (e) shows a state after coining.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 1a Plate material 2 Through-hole 3 Cutting blade 4 Die 41 Processing hole 42 Concave part 5 Punch 51 Burning processing part 52 Coining processing part

Claims (1)

[Claims] 1. An upper edge of a die for punching is provided with a concave portion corresponding to a grinding blade shape of a grinding plate to be formed. Forming a coining part that pushes and expands the end face, punches a plate material made of a thick metal plate for a grinding plate so that the burring portion remains, and then further advances the punch, forming a grinding blade at the burring portion. Method for manufacturing a grinding plate.