JPH0691066A - Cutter - Google Patents

Abstract

PURPOSE:To provide a cutter regularly having a new sharp blade edge without polishing by providing a blade edge forming member formed in a thin layer from a material harder than the material of the blade to extend from the cutting edge of the blade to the inner part of the blade. CONSTITUTION:A cutter 10 is provided with a blade edge forming member 16 formed into a thin layer or a foil by a material harder than the material of a blade 12 so as to extend from the cutting edge 14 of the blade 12 to the inner part of the blade 12. To manufacture this cutter 10, two blade members 12', 12'' having a form in which the blade 12 is halved in a vertical section 18 passing the cutting edge 14 are prepared In the area from a cutting edge 14' corresponding to the blade edge of a side surface 20 corresponding to the section 18 of one blade member 12' to its inner part, the thin-layered blade edge forming member 16 is formed by a material harder than the material of the blade member 12' over the range from the top end of the blade member 12' to the root end The cross sectional width or thickness of the blade edge forming member 16 is about 2 to 100 microns. Then, the two blade members 12', 12'' are bonded to each other to nip the blade edge forming member 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knife such as a knife or a kitchen knife, and more particularly to a knife that does not need to be sharpened even when used and can always exhibit a sharp cutting edge, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventional blades have an unavoidable problem in that the blade edge becomes blunt and the sharpness thereof deteriorates as the blade is used.

Therefore, various attempts have been made to improve this problem.

For example, to improve the wear resistance of the material of the blade. Although this attempt has the effect of prolonging the cutting edge, it cannot eliminate wear, and therefore requires polishing, and in the case of polishing,
Due to its wear resistance, polishing work becomes difficult.

Further, a method of coating the cutting edge with a material having a high wear resistance is also used. However, if the cutting edge of the cutting tool produced by this method is used for a long period of time, the coating may wear and the cutting edge may become dull. Inevitable.

In view of the above points, it is an object of the present invention to provide a cutting tool which can always exhibit a new sharp cutting edge without polishing and a manufacturing method thereof.

[0007]

That is, the blade according to the present invention extends from the blade edge of the blade to the inside of the blade, or extends from the blade edge along one side surface of the blade. As described above, the basic feature is that the blade forming member is formed in a thin layer from a material harder than the blade material.

The present invention further provides a method for producing a blade as described above, in which two blade members each having a shape obtained by dividing the blade into two parts in a vertical section passing through the edge of the blade are prepared. A thin layer blade edge forming member made of the hard material is formed from an edge corresponding to the blade edge on a side surface corresponding to the cross section of one blade member to an inner portion thereof, and both blade members are joined at the cross section It is characterized by being a blade.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on the embodiments shown in the accompanying drawings.

FIG. 1 shows a knife or Western knife 10 according to an embodiment of the present invention, and FIGS.
Shows the steps for manufacturing the blade 10.

That is, the blade 10 has a blade edge forming member 16 formed in a thin layer or a foil with a material harder than the blade material so as to extend from the blade edge 14 of the blade 12 to the inside of the blade. It is characterized by having.

In order to manufacture this blade, first, two blade members 12 'and 12 "having a shape obtained by dividing the blade into two parts along a vertical section 18 (Fig. 4) passing through the edge 14 of the blade (Fig. 2) are prepared. As the material of the blade member, stainless steel, cast iron, aluminum, resins and the like can be used.

From the tip of the blade member 12 'to the proximal end in the region from the edge 14' corresponding to the cutting edge 14 of the side surface 20 corresponding to the cross section 18 of one blade member 12 'to the inside (upper side in the drawing). The thin-layered blade edge forming member 16 is formed of a material harder than the material of the blade member over the range of (3) (FIG. 3). Various methods can be used as a method for forming the blade edge forming portion, and for example, a blade of a blade edge forming member can be formed by forming a cemented carbide film by a thermal spray coating method. Other methods include solid carburizing method, gas carburizing method, gas carbonitriding method, gas nitriding method, salt bath method (boronization, sulfurization, nitriding, carburizing), metal infiltration method (diffusion coating method), and induction firing. There are an injection method, a hardfacing method, an electric discharge hardening method and the like. Further, it is preferable that the transverse width, that is, the thickness of the blade edge forming member is about 2 to 100 microns.

Next, the two blade members 12 ', 12 "prepared as described above are joined so as to sandwich the cutting edge forming portion 16 (FIG. 4). This joining method is conventionally used, for example, It can be arbitrarily selected from various methods such as a high temperature pressure welding method.

As described above, the blade according to the present invention having the blade forming member 16 in the blade is formed.

FIGS. 6 and 7 show a knife or Japanese-style knife 22 according to another embodiment of the present invention. Compared to the ones shown in FIGS. 1 to 5, in this blade, the blade members 24, 24 ″ have different shapes, but the manufacturing method thereof is substantially the same.

In the above-mentioned embodiment, the blade forming member is formed inside the blade. However, the blade according to the present invention is not limited to this, and the blade member as described above is single and one side surface thereof is provided. It is also possible to form the blade tip forming member to be a blade.

[0018]

The blade according to the present invention is formed as described above, and the blade tip forming member is formed to be harder than the blade member. Therefore, if the blade is used, the blade tip is formed. The blade portion around the forming member wears first, so that the edge of the blade forming member 16 is always kept the same as or slightly protrudes from the edge of the blade member, and the edge of the blade forming member is always kept. It will be retained as a new cutting edge (Fig. 5).

Therefore, the blade according to the present invention can always be provided with a new blade until the blade forming member is worn away and can be used with good sharpness for a long period without the need for polishing. .

[Brief description of drawings]

FIG. 1 is a side view of a cutting tool according to an embodiment of the present invention.

FIG. 2 is a sectional view of the blade in the first step for manufacturing the blade shown in FIG.

FIG. 3 is a sectional view of the cutting tool in the second step.

FIG. 4 is a sectional view of the cutting tool in the final step.

FIG. 5 is a sectional view of the same blade after being used for a certain period of time.

FIG. 6 is a side view of a cutting tool according to another embodiment of the present invention.

7 is a sectional view of the blade of FIG.

[Explanation of symbols]

 10 --- blade; 12 --- blade; 12 ', 12 "--- blade member; 14 --- blade edge; 16 --- blade forming member; 18 --- cross section; 20 --- side surface; 22 --- knife; 24 ', 24 "--- blade member

Claims (3)

[Claims] 1. A thin layer made of a material harder than that of the blade so as to extend from the blade edge of the blade into the inside of the blade or to extend from the blade edge along one side surface of the blade. A blade comprising a formed blade tip forming member. 2. The cutting tool according to claim 1, wherein the cutting edge forming member has a transverse width, that is, a thickness of about 2 to 100 microns. 3. A method of manufacturing a blade comprising a blade edge forming member formed in a thin layer from a material harder than the material of the blade so as to extend from the blade edge of the blade into the inside of the blade, said method comprising: Two blade members each having a shape obtained by dividing a blade into two parts in a vertical cross section passing through the edge of the blade are prepared, and from the edge corresponding to the edge of the blade of the side surface corresponding to the cross section of one blade to the inner portion thereof, A method for manufacturing a blade, comprising forming a thin-layer blade edge forming member made of a material, and joining both blade members at the cross section to form a blade.