JP2000237469A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive cutting tool having a cutting quality equal to or higher than that of a carbon steel kitchen knife and generating no rust similarly to a stainless steel kitchen knife by builup-welding or pressure bonding a high hard material to the knife edge part of a main body composed of a stainless material, and forming a cutting blade by polishing this buildup welding part or a pressure bonding part. SOLUTION: A plate material composed of austenite stainless steel (SUS 304) as a stainless material generating no rust is adopted as a raw material of a kitchen knife main body 1, and this is cut in a prescribed shape by a laser beam. The knife edge 2 is formed by buildup-welding a high hard material such as stellite to a knife edge part 1b, and a cutting blade is formed by polishing the knife edge 2. A handle is attached by using a handle attaching nail hole 1c to complete a kitchen knife. At this time, after heating the knife edge 2 to a temperature of 500 to 800 deg.C, a naturally cooling heat treatment is desirably applied. While, a disk-shaped cutting tool 3 is formed in a sandwich shape by sandwiching a stellite material 3a of a central layer between aluminum alloys (3003, 5083) 3b of upper/lower layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool which is resistant to rust and has excellent sharpness.

[0002]

2. Description of the Related Art Conventionally, when a fish processing plant or the like cuts a fish having a lot of moisture and hard bones, all the tools are expensive because special materials are used. Also,
Conventionally available cutting tools such as kitchen knives commonly used at home are hot knives manufactured by blacksmiths who hot forge carbon steel and forge and weld the steel to the cutting edge (hereinafter referred to as knives).
"Carbon steel knife". ) And kitchen knives using stainless steel (hereinafter referred to as “stainless steel knives”).

[0003] Carbon steel knives, which are full-fledged knives manufactured by blacksmiths in the old days, are sharp, but rust easily occurs during use, causing problems in cooking, and their prices are generally high. Frequent care after use and strict storage are necessary in order to prevent rust from being generated on the carbon steel knife. When used for a long period of time, rust may accumulate and the cutting edge may become ragged.

[0004] On the other hand, commercially available stainless steel knives are simple and suitable for cutting vegetables and the like, and have no rust, but have poor sharpness. Further, the cutting edge was easily crushed and the sharpness was further deteriorated, and the durability in terms of sharpness was poor. Further, when food is cut with this stainless steel knife, the fiber of the food is cut apart and there is a concern that the taste of the dish may be reduced.

[0005]

SUMMARY OF THE INVENTION The present invention overcomes the drawbacks of the knife used for cutting fish in a fish processing factory and the like, and the drawbacks of household knives, namely, carbon steel knives and stainless steel knives. It is an object of the present invention to provide a cutting tool such as a sharpened kitchen knife and a cutting knife, which has a sharpness equal to or higher than that of a carbon steel kitchen knife, and does not generate rust like a stainless steel kitchen knife. It is an object of the present invention to provide an inexpensive cutting tool such as a kitchen knife or a cutting blade, which does not have slicing or blade slicing, generally does not require repolishing.

[0006]

Means for Solving the Problems (1) The present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 is characterized in that a high-hardness material is provided on a cutting edge portion of a main body made of stainless steel. Is provided by welding or press-fitting, and polishing the build-up weld or press-fitted portion to form a cutting blade.

According to the first aspect of the present invention, a high-hardness material having a high hardness is overlay-welded or pressure-bonded to the main body of the stainless steel, and the overlay-welded portion or the pressure-bonded portion is polished to form a cutting blade. Since it is a cutting tool, even when cutting a large number of wet items, it is sanitary without rust and can maintain good cutting properties for a long period of time.

(2) The cutting tool according to the first aspect, wherein the stainless steel is austenitic stainless steel and the high hardness material is a stellite material. Is provided.

According to the invention of claim 2, since austenitic stainless steel is used for the material of the main body, no rust is generated even when a large number of wet materials are cut, and the hardfacing material or the pressure-bonding material of the main body has a hardness. The use of a stellite material with a high degree of hygiene results in no sanitary rust and good cutability over a long period of time.

(3) The invention of claim 3 provides a cutting tool according to claim 2, wherein the main body is formed in the shape of a kitchen knife to form a kitchen knife body.

According to the third aspect of the present invention, since austenitic stainless steel is used for the material of the body formed in the shape of a kitchen knife, no rust is generated, and a high hardness stellite material is used for the cladding material or pressure-bonding material of the body. Since it is used, it does not generate rust and is hygienic even as a kitchen knife for home use, and can maintain good cutting performance for a long time.

(4) The invention according to claim 4 is the cutting tool according to claim 2 or 3, wherein the stellite material is overlay-welded or pressure-bonded to a main body made of austenitic stainless steel, and then the overlay weld. 500 parts or crimped parts
The present invention provides a cutting tool characterized by forming a cutting blade by heat-treating at a temperature of from about 800C to about 800C, and polishing the build-up welded part or the pressure-bonded part.

According to the fourth aspect of the present invention, in addition to the features of the second or third aspect, since the cutting edge is further heat-treated at about 500 ° C. to 800 ° C., the stellite (edge) immediately after the overlay welding is performed. Since cracking of the blade is prevented and compressive stress remains on the blade edge, blade spill can be suppressed as much as possible.

(5) According to a fifth aspect of the present invention, a plate-like stellite material or austenitic stainless steel is cut into a predetermined shape, and an aluminum alloy material is vacuum-pressed on both sides to form a three-layer plate. The cutting tool is characterized in that the cutting edge is formed by polishing the end of the cutting tool.

According to the fifth aspect of the present invention, the cutting tool needs to have a certain thickness to obtain the required rigidity.
Although it was expensive and heavy if made of only stellite material or the like, the cost and weight of the cutting tool can be reduced by using a relatively inexpensive and lightweight aluminum alloy.

Further, it is possible to use waste materials and existing equipment generated from the production site, and it is possible to obtain a large amount of various cutting tools at low cost.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1 and 2 are explanatory views of a manufacturing process of a kitchen knife as a cutting tool according to the first embodiment, and are plan views thereof. FIG. 3 shows a temperature curve when heat treatment is performed. FIG. 4 is an explanatory diagram of the hardness measurement result of the kitchen knife of the present embodiment.

In FIG. 1, reference numeral 1 denotes a kitchen knife body, which is made of an austenitic stainless steel (SUS304) plate having a thickness of 1 to 3 mm as a non-rusting stainless steel. It is cut by a laser beam into such a predetermined shape. Here, the cutting with the laser light is performed because the laser light has the highest cutting speed and requires less maintenance after cutting. 1a is the back of the kitchen knife body 1, 1b
Denotes a blade edge portion of the kitchen knife body 1, and 1c denotes a handle mounting nail hole.

Next, as shown in FIG. 2, a hard material such as stellite is welded to the cutting edge 1b to form a portion constituting the cutting edge 2 to a thickness of 2 to 3 mm. Thereafter, the cutting edge 2 is polished to form a cutting blade, and a handle is attached using the handle mounting nail hole 1c to complete a knife (cutting tool).

Further, if necessary, after the above-mentioned overlay welding, it is preferable to heat the cutting edge 2 to a temperature of 500 ° C. to 800 ° C. as shown in FIG. The reason for performing this heat treatment is to prevent cracking of the cutting edge 2 immediately after build-up welding, that is, the stellite material, and to reduce compressive stress on the cutting edge 2 to reduce blade spillage. Of course, this processing is not absolutely necessary and can be omitted. However, it is better to carry out this processing in order to improve the quality. After the heat treatment, the cutting edge 2 is polished to form a cutting blade, and the cutting edge is attached using the handle mounting nail hole 1c to complete the knife (cutting tool). The above-mentioned high hardness material may be attached by crimping instead of overlay welding.

As a result of various experiments, it has been found that the above-mentioned kitchen knives can be manufactured simply and with excellent functions and at a low manufacturing cost by the following manufacturing method.

The shape of the kitchen knife as shown in FIG. 1 is input to a computer, and a 2 mm thick S
US304 material was cut automatically. In the experimental example, about 100 to 120 sheets can be cut in one hour, and the cut price per sheet is about 300 to 400 yen.

Next, as shown in FIG. 2, the stellite NO. One material (bar diameter: 1.2 mm) was overlaid and welded to a portion constituting the cutting edge 2 with a thickness of 2 to 3 mm. The required time was about 2 to 3 minutes per piece, and 5 to 6 minutes per piece, including the heat treatment time shown in FIG. The unit price is about 400 to 500 yen including the material cost.

Next, the overlaid welded kitchen knife was polished with a polishing machine so as to have the same edge as that of a commercially available ordinary kitchen knife. This time required the longest time in the work process, but it could be completed in about 30 to 40 minutes per one with skill.

Further, in order to confirm and evaluate the sharpness of the cutting edge 2 of the kitchen knife, which is the cutting tool according to the present embodiment, hardness was measured. The results are as shown in FIG. As shown in FIG. 4, the hardness of the cutting edge is 550 to 650.
HV, about 3 to 3 of the cutting edge of commercial stainless steel knives.
It was 5 times, and it was confirmed that the hardness was equal to or higher than the hardness of a carbon steel knife by a blacksmith.

The prototype kitchen knife was used at home for one month. However, even if it was used at home for one month, it was in the same condition as at the beginning of the trial production, and it was confirmed that there was no need for regrind. did it.

Next, a second embodiment of the present invention will be described with reference to FIGS. 5 and 6 are explanatory views of a manufacturing process of a disk-shaped cutting blade as a cutting tool according to a second embodiment of the present invention, and are cross-sectional views thereof. FIG. 7 is a plan view of a disk-shaped cutting blade.

In FIGS. 5 to 7, reference numeral 3 denotes a disk-shaped cutting tool, which is made of a light and highly corrosion-resistant aluminum alloy (3003, 5083) with a stellite material 3a of tool steel having high hardness and good machinability as a central layer. 3b constitutes a three-layer sandwich sandwiched between upper and lower layers.

A method of manufacturing a disk-shaped cutting blade according to the present embodiment will be described below. First, as shown in FIG. 5, aluminum alloys 3b are placed on both sides of a disk-shaped stellite material 3a. Put in a vacuum crimping container, temperature 4
At 80 to 520 ° C., the rolling reduction of the aluminum alloy 3b is 0.
Crimping is performed to about 25%.

Stellite material 3a and aluminum alloy 3b
Then, the circumferential portion of the disc-shaped cutting blade 3 to which is pressed is polished to an acute angle with a polishing machine as shown in FIG. As a result, a circumferential surface of the stellite material 3a is obtained as a cutting blade. FIG. 7 is a plan view showing this state. A circular hole 3c is made in the center of the disk-shaped cutting blade 3 and fixed through the shaft of a rotating machine, so that it can be used as a rotary cutting tool.

In the second embodiment described above,
Although the three central layers are made of the stellite material 3a, a disk-shaped cutting blade having high stainless steel can be obtained by using stainless steel of austenitic stainless steel instead.

Further, not only the disk-shaped cutting blade but also the above-mentioned 3
Cutting blades having a linear or curved blade shape in a layered structure can likewise be obtained.

That is, the cutting tool of the present embodiment requires rigidity and a certain thickness in order to resist the reaction force from the material to be cut in the cutting blade, which is a conventional cutting tool, and requires a certain amount of stellite. Although it would be expensive if made only from materials, etc., the cost of the cutting blade can be reduced by using a relatively inexpensive aluminum alloy.

In the case of a hand-held tool, if it is made only of a conventional stellite material or the like, the tool becomes heavy and workability is poor. However, according to the cutting blade of the present embodiment, an aluminum alloy is crimped on both sides. In addition, the workability can be improved by reducing the weight.

The stellite material and stainless steel austenitic stainless steel, which are tool steels used for the cutting tool of the present embodiment, are expensive, but it is also possible to use waste material generated from the production site. Vacuum pressure bonding containers and the like can also be used when existing equipment is idle, and it is possible to obtain a large number of various cutting tools at low cost. That is, the cutting tool of the present invention has various possibilities and applicability in its use.

For example, in the butt welding portion of the ship outer plate, the welding beam may rise and adversely affect the propulsion efficiency of the ship, and the protrusion of the bead may be cut using a robot. However, the excess portion of the weld bead has a high hardness and the wear of the cutting blade is severe, so that a large number of cutting blades are required and the cost is high. If the cutting tool of the present invention is used for such a purpose, it is inexpensive and lightweight, and the effect is great. For such applications, the cutting tool of the second embodiment is suitable. However, the cutting tool of the first embodiment of the present invention is also formed of the welding part by determining the shape according to the use. It can be used for various purposes other than cutting work.

Although the present invention has been described with reference to the illustrated embodiments, it is needless to say that the present invention is not limited to the embodiments and various changes may be made to specific embodiments within the scope of the present invention. No.

[0038]

(1) According to the first aspect of the present invention, the cutting tool is formed by welding or crimping a high-hardness material to the cutting edge portion of the main body made of stainless steel, and then forming the cladding welding portion or crimping portion. Since the cutting blade is formed by polishing, even when a large number of wet products are cut, rust is not generated and sanitary, and good cutting performance can be maintained for a long time.

(2) In the invention of claim 2, the cutting tool according to claim 1, wherein the stainless steel is austenitic stainless steel and the hard material is a stellite material. Because it is composed, the main body material is made of austenitic stainless steel, so even when cutting a lot of wet ones, no rust is generated, and since the hardfacing material or the pressure bonding material of the main body is made of a high hardness stellite material, It is sanitary without rust, and has good cutting properties for a long time.

(3) According to the third aspect of the present invention, in the cutting tool according to the second aspect, the cutting tool is configured so that the main body is formed in the shape of a kitchen knife and becomes a kitchen knife main body.
Since austenitic stainless steel is used for the material of the body formed in the shape of a kitchen knife, no rust is generated, and a hardened stellite material is used for the cladding material or pressure bonding material of the body.
Even as a household kitchen knife, it does not rust and is hygienic, and can maintain good cutting properties for a long time.

(4) According to the invention of claim 4, in the cutting tool according to claim 2 or 3, the stellite material is overlay-welded or pressure-bonded to a main body made of austenitic stainless steel. Then, the overlay welding portion or the pressure bonding portion is heat-treated at 500 ° C. to 800 ° C., and the overlay welding portion or the pressure bonding portion is polished to form a cutting blade. In addition to the effect of the third aspect of the present invention, since the cutting edge is further heat-treated at about 500 to 800 ° C., cracking of stellite (blade) immediately after build-up welding is prevented, and compressive stress remains on the cutting edge. It can be suppressed as much as possible.

(5) According to the invention of claim 5, the cutting tool is formed by cutting a plate-shaped stellite material or austenitic stainless steel into a predetermined shape, and then vacuum-pressing aluminum alloy materials on both surfaces to form a three-layer plate. The edge of the three-layer plate is polished to form a cutting edge, so that the cutting tool needs a certain thickness to obtain the required rigidity. Although expensive and heavy, the use of a relatively inexpensive and lightweight aluminum alloy can reduce the cost and weight of the cutting tool.

Further, it is possible to use waste materials generated from the production site and existing equipment, and it is possible to obtain a large amount of various cutting tools at low cost.

(6) Still further, in addition to the invention of claim 5,
The cutting tool according to the first, second, third, and fourth aspects of the present invention is highly effective when applied to applications requiring a low-cost, large-volume sharp blade such as welding beam cutting work.

[Brief description of the drawings]

FIG. 1 is an explanatory view of one process of manufacturing a kitchen knife as a cutting tool according to a first embodiment of the present invention, and is a plan view of a kitchen knife body.

FIG. 2 is an explanatory view of a manufacturing step following FIG. 1;

FIG. 3 is an explanatory diagram of a temperature curve of a heat treatment.

FIG. 4 is an explanatory diagram of a hardness measurement result of the kitchen knife according to the first embodiment.

FIG. 5 is an explanatory view of one process of manufacturing a disk-shaped cutting blade which is a cutting tool according to a second embodiment of the present invention, and is a cross-sectional view of the disk-shaped cutting blade.

FIG. 6 is an explanatory view of the manufacturing process continued from FIG. 5;

FIG. 7 is a plan view of a disk-shaped cutting blade according to a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 kitchen knife main body 1a back 1b blade tip 1c handle mounting nail hole 2 blade tip 3 disk-shaped cutting blade 3a stellite material 3b aluminum alloy 3c hole

Continued on the front page (72) Inventor Masafumi Yashiro 5-717-1, Fukahori-cho, Nagasaki-shi Naganishi Engineering Co., Ltd. (72) Inventor Shizuo Kawanami 5-717-1, Fukahori-cho, Nagasaki-shi, Naganishi Engineer Ring Co., Ltd. F term (reference) 3C061 BA20 DD06 EE12 EE38

Claims (5)

[Claims] 1. A hardened material is weld-welded or pressure-bonded to a cutting edge of a main body made of a stainless steel material, and a cutting blade is formed by polishing the weld-welded portion or the pressure-bonded portion. Cutting tools 2. The cutting tool according to claim 1, wherein the stainless steel is austenitic stainless steel, and the high hardness material is a stellite material. 3. The cutting tool according to claim 2, wherein said main body is formed in the shape of a kitchen knife to form a kitchen knife main body. 4. The cutting tool according to claim 2, wherein the stellite material is overlaid or press-bonded to a main body made of austenitic stainless steel, and then the overlaid welded portion or the crimped portion is heated to 500 ° C. or lower. A cutting tool characterized by forming a cutting blade by heat treatment at 800 ° C. and polishing the overlay welding or crimping portion. 5. A plate-shaped stellite material or austenitic stainless steel is cut into a predetermined shape, an aluminum alloy material is vacuum-pressed on both surfaces to form a three-layer plate, and the edge of the three-layer plate is polished to obtain a cutting edge. A cutting tool characterized by forming: