JPH04344836A - Grinding plate and its manufacture - Google Patents

Abstract

PURPOSE:To provide the grinding plate which is excellent in its grinding capacity, and can be used easily by forming a projection shape of a plate holder with a projection and a shape of a projection corresponding position of a die, to a shape of a cutting blade to be formed, at the time of blanking a through- hole on a thick metallic plate by a fine blanking method, and forming the cutting blade projected from a hole edge simultaneously with blanking of the hole. CONSTITUTION:Many through-holes 2 are pierced on a main body 1 made of a thick metallic plate by a fine blanking method, and also, by projecting a hole edge of the through-hole 2, a cutting blade 3 is formed. In that case, in the periphery of a punch 4, a plate holder 5 is placed, and on the lower side, as well, a reverse holder 7 is placed in accordance with the punch 4 together with a die 6. In order to make its holding complete, a projection 51 is provided on the plate holder 5, the projection 51 is formed to a shape corresponding to a shape of the cutting blade 3, and also, on the upper face of the die 6, as well, a recessed part 61 corresponding to the cutting blade 3 is provided. In such a state, when blanking is executed, the grinding plate which is excellent in its grinding capacity and can be used easily can be obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a plate-shaped grinding body such as a cooking grater or a file for grinding soft materials such as plastic and gypsum board.

0002

[Prior Art and Problems to be Solved by the Invention] A metal cooking grater is made by punching a star shape into a thin metal plate, making a circular hole, and attaching a triangular veneer to the edge of the circular hole. It is known that the surface of a thick metal plate is gouged out with a chisel-like object to form cutting protrusions. However, the former has low cutting ability and poor durability, while the latter has high cutting ability and excellent durability, but has the disadvantage that food fibers can get caught in the protrusions when used. However, in its manufacture, the step of scooping out and raising the protrusion has to be repeated several times, which is very complicated.

[0003]Furthermore, paper sandpaper is known as a file for sharpening soft materials, but it is extremely abrasive and cannot withstand long-term use, and ordinary metal files can easily scratch soft materials. It gets clogged. Therefore, the present invention proposes a novel grinding plate using a thick metal plate and a method for manufacturing the same.

0004

[Means for Solving the Problems] The grinding plate according to the present invention includes:
When punching a through hole in a thick metal plate using the fine blanking method, the shape of the protrusion on the presser with a protrusion and the shape of the corresponding position of the protrusion on the die are set to the shape of the cutting blade to be formed, and the hole protrudes from the edge of the hole at the same time as the hole is punched. The cutting edge is characterized by having a sharp cutting edge formed therein.

[0005] In addition, the manufacturing method adopts a fine blanking method in punching out a thick metal plate, and
The shape of the protrusion of the presser with protrusion and the shape of the corresponding position of the protrusion of the die are set to the shape of the cutting blade to be formed, and the cutting blade protruding from the edge of the hole is formed at the same time as punching the hole.

[0006]

[Function] Fine blanking method is punch: In addition to minimizing the clearance between the dies, a strong plate holder is attached around the punch to completely hold down the workpiece plate and punch it out, creating a cut on the sheared surface. Therefore, the protruding portion of the edge of the punched hole formed by the lower pressure of the plate holder serves as a cutting edge.

[0007]

[Example] Next, an example in which the present invention is applied to a grater will be described. As shown in Fig. 2, the grater is made of a main body 1 made of a thick metal plate with a large number of through holes 2, and the edges of the through holes 2 are made to protrude to form cutting blades 3. The manufacturing method uses a known fine blanking method. In other words, a press processing device that can perform the fine blanking method when punching the through hole 2, specifically, FIG.
As shown in the figure, a plate holder 5 is arranged around the punch 4, and a reverse holder 7 is arranged below the punch 4 along with a die 6. In this press working device, a protrusion 51 is provided around the punch 4 in order to completely hold down the workpiece by the plate holder 5, but the present invention particularly focuses on the shape of the cutting blade 3 to be formed. A projection 51 having a shape corresponding to that of the cutting blade 3 is provided, and a recess 61 having a shape corresponding to the cutting blade 3 is also provided on the upper surface of the die 6.

As shown in FIGS. 3, 4, and 5, when trying to punch through holes 2 into the body 1 of the grater using this press processing device, the body 1 is strongly pressed by the lowering of the plate holder 5. At the same time, the punch 4 is lowered to punch out the through hole 2.
The through hole 2 and the cutting blade 3 are formed at the same time in one punching process. However, the punching process described above is performed by strongly pressing around the punch 4.
Since the clearance between the cut edge and the die 6 is made as small as possible, the cutting edge 3, which is formed so as to protrude with the cut end of the punch serving as a shearing surface, has sufficient grinding ability. Therefore, by punching out the required number of through holes 2, a desired grinding plate (grater) can be manufactured.

[0009] The present invention is not limited to the grater as shown in the above embodiments, but can also be used, for example, with a file for shaving soft materials such as plastic and plasterboard.
It can be applied to all other plate-shaped grinding bodies.

0010

[Effects of the Invention] As described above, when manufacturing a grinding plate using a thick metal plate, the present invention provides the following steps in punching the thick metal plate.
In addition to adopting the fine blanking method, the shape of the protrusion on the plate holder with protrusions and the shape of the corresponding position of the protrusion on the die were set to the shape of the cutting blade to be formed, and the cutting blade protruding from the hole edge was formed at the same time as the hole was punched. This provides a grinding plate that has excellent grinding ability and is easy to use.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a punched portion of an embodiment of the present invention.

FIG. 2 is an overall perspective view of a grater embodying the present invention.

FIG. 3 is an explanatory diagram of the punching process (at the start of punching) of the present invention.

FIG. 4 is an explanatory diagram of the punching process (immediately before punching) of the present invention.

FIG. 5 is an explanatory diagram of the punching process (immediately after punching) of the present invention.

[Explanation of symbols]

1 Main body 2 Through hole 3 Cutting blade 4 Punch 5　Plate holder 51 Protrusion 6 Die 61 Recess 7　Reverse press

Claims (2)

[Claims] Claim 1: When punching a through hole in a thick metal plate by the fine blanking method, the shape of the protrusion on the plate holder with protrusions and the shape of the corresponding position of the protrusion on the die are set to the shape of the cutting blade to be formed, and the hole is punched. At the same time, a grinding plate is characterized in that a cutting edge is formed that protrudes from the hole edge. 2. In punching a thick metal plate, a fine blanking method is adopted, and the shape of the protrusion on the plate holder with protrusions and the shape of the corresponding position of the protrusion on the die are set to the shape of the cutting blade to be formed, and the holes are A method for manufacturing a grinding plate, characterized in that a cutting edge protruding from the hole edge is formed at the same time as punching.