JPH11293369A - Blade material composed essentially of titanium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a lightweight blank excellent in durability of cutting well by compacting and sintering a composition prepared by mixing specific proportions of Ti powder of specific grain size, aluminum-vanadium alloy powder consisting of aluminum and vanadium in a specific ratio and having specific grain size and vanadium carbide powder of specific grain size. SOLUTION: This material is a sintered compact composed of a composition prepared by mixing, based on 100 pts.wt. of the total amount, about 80 pts. of titanium powder of 100 to 150 μm grain size, about 5 to 8 pts. of aluminum- vanadium alloy powder of <=20 μm grain size having an aluminum/vanadium ratio of 6/4 by weight and about 8 to 15 pts. of vanadium carbide powder of <=3 μm grain size. In order or know the toughness of a blade material, an inspection sample 1 is supported by round bars 3 placed on a fixed plate 2 and the central part of the inspection sample is pressed by means of a round bar 4 having the size identical with the round bars 3 to measure the pressing force at the time of breakage of the inspection sample. Sintering is performed at 1200 to 1300 deg.C for 2 hr in a vacuum furnace or an argon gas furnace. If necessary, aging treatment is carried out at 400 deg.C for 40 hr or at 500 deg.C for 3 hr.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention belongs to the technical field of knives, cutter blades, kitchen knives, scissors, razors, and various other cutting tools mainly for civil use. Secondly, the present invention belongs to the technical field of a cutting tool produced by powder metallurgy.

[0002]

Heretofore, most of the above-mentioned various knives use carbon steel as a cutting material, but the knives such as kitchen knives mainly used at home are quantitatively used. As for stainless steel, daily care such as rust removal and blade sharpening is disliked, and in recent years, stainless steel made of low carbon steel mixed with a large amount of nickel and chrome has become popular. However, while a stainless steel blade has the advantage of being less likely to rust, it is much less sharp than a carbon steel blade. Therefore, recently, cooking blades using so-called special stainless steel, which is obtained by adding molybdenum, vanadium, and other special metals to stainless steel, are entering the household goods market.

[0003] The cutting tool using the special stainless steel as a cutting material is not only stainless steel but also stainless steel.
Excellent sharpness at the beginning of use. However, the sustainability of the sharpness is extremely insufficient.

On the other hand, with the progress of powder metallurgy technology in recent years,
Blade materials made of zirconia-alumina ceramic powder have also been trial manufactured. These blade materials are lightweight and stainless steel, and can provide sharp blades with high hardness, but have the major disadvantage that the blades are easily chipped.

[0005] In view of the above-mentioned points, it is not only stainless steel, but also much lighter than stainless steel and special steel in terms of sustainability of sharpness. In addition, it is more cost-effective than special stainless steel. It is an object of the present invention to provide such a blade material.

[0006]

Means for Solving the Problems The present invention relates to a blade material to which a so-called powder metallurgy technique is applied, which uses a powder of a metal or a compound thereof as a raw material and produces a sintered product through a compression molding process and a sintering process. The metal composition obtained by mixing the following three types of powders is used as a powder material for powder metallurgy. That is,
Titanium (Ti) powder having a particle size of 100 to 150 μm in a total amount of 100 parts by weight
0 parts Aluminum-vanadium alloy powder having a weight ratio of aluminum (Al) 6: vanadium (V) 4 with a particle diameter of 20 μm or less About 5 to 8 parts Vanadium carbide (VC) with a particle diameter of 3 μm or less
About 8-15 copies

The present invention satisfies the above-mentioned requirements, and here, conditions for applying the powder metallurgy technique to the above-mentioned metal composition as a powder material will be described. However, the numerical value itself under such conditions is a known matter in general powder metallurgy technology, and examples thereof will be described below. That is, a pressure of 4 ton / cm ² or more is used for compression molding. Sintering is performed in a vacuum furnace or an argon gas furnace in the range of 1,200 to 1,3
The required time at 00 ° C. is about 2 hours. When the aging treatment is desired, the aging treatment may be performed at 400 ° C. for 40 hours or at 500 ° C. for about 3 hours.

[0008] The blade material made of the sintered product thus obtained can be cut into a desired portion by grinding to obtain a desired blade.

[0009]

In order to avoid redundancy in the first and second embodiments of the present invention, only the weight ratio between each metal and alloy in the composition as a raw material for powder metallurgy will be described below. When the compositions prepared according to the numerical examples listed here were used as raw materials for powder metallurgy, almost the same good results were obtained. (Composition example) However, the particle size of each metal powder or alloy powder is described above.

As described in the above, the processing conditions of the powder metallurgy process are as follows.

[0007] As described above. In the above Composition Example I, Fe was blended as a bulking agent having no adverse effect on the performance of the blade material, and Ag and Cu imparted remarkable antibacterial properties to the blade material when blended at about 1%. At the same time, it was clarified that there was no adverse effect on the hardness of the blade material and the ability to prevent chipping of the blade, which was the object of the present invention. Of course, when it is not necessary to provide antibacterial properties.
The blending of g or Cu can be omitted.

[0010]

Since the blade material according to the present invention contains about 80% of titanium as a main component, the blade made of the blade material is a steel blade or a stainless steel blade mainly composed of carbon steel. Or, it is naturally lighter than the above-mentioned special stainless steel blades, and is superior to stainless steel blades in that it does not rust in seawater.

The hardness of the blade material of the present invention is HRC 45 ° to 50 °.
°, and it is evident that a very high hardness blade can be obtained from this blade material. A sharp blade can be obtained from a high-hardness blade material by cutting, but the sharpness resulting from the high hardness does not always give a high-quality blade. If a high-hardness knife is initially sharp but poor in toughness,
This is because, due to repeated use, minute chipping occurs on a very thin blade, and the blade becomes dull soon.

As a clue to know the toughness of the blade material, the inventor conducted the following bending force measurement. Referring to FIG. 1, reference numeral 1 denotes a 55 mm × 55 mm × 1.5 mm specimen having a diameter of 8 m, which is placed in parallel on the platen 2 at an interval of 25 mm.
This sample 1 is supported by two round bars 3 having a length of 40 mm. Reference numeral 4 denotes a round bar having the same dimensions as the round bar 3. The center of the sample 1 was pressed from above by the round bar 4, and the pressing force when the sample 1 was broken was measured. The measurement results when the blade material of Composition Example I in the above-mentioned Examples was used as a specimen showed that the transverse rupture force per unit cross-sectional area was slightly over 600 kg / cm ² . In addition, almost the same measurement results were obtained when the blade material of Composition Example II was used as a sample. As a control example of measurement, a commercially available zirconia ceramic knife (1.5 m thick blade plate)
m) was cut into the main surface dimensions of Sample 1 described above, and the transverse rupture force was measured in the same manner. The measured value was approximately 200 kg.
/ Cm ² , the bending strength was 1/3 of the bending strength of the sample according to the present invention.

Now, the present inventor has filed Japanese Patent Application No. 329/1997.
Japanese Patent No. 397 discloses the following invention relating to a blade material. That is, about 80 parts of titanium (Ti) powder having a particle size of 150 μm or less in a total amount of 100 parts by weight, and about 6 parts of aluminum-vanadium alloy powder having a particle size of 20 μm or less and having a weight ratio of aluminum (Al) 6: vanadium (V) 4. ８8 parts Iron (Fe) powder having a particle size of 2 μm or less Approximately 1 part Chrome carbide (Cr) having a particle size of 2 μm or less
₃ C ₂ ) powder or titanium carbide (TiC) powder about 1
The present invention relates to a blade material comprising a metal composition obtained by mixing 0 to 1 part of silver (Ag) powder having a particle size of 2 μm or less as a powder material for powder metallurgy.

The present invention substantially corresponds to the above-mentioned ones except that iron powder and silver powder are excluded and vanadium carbide powder is blended in place of chromium carbide and titanium carbide powder. Further, it has been clarified by experiments that the sharpness and the sustainability of the sharpness of the blade are not inferior to those of the above-mentioned prior art.

That is, according to the present invention, not only is the blade made of stainless steel as a blade material not only stainless steel but also significantly lighter than stainless steel, but also it is extremely sharp and at the same time, sharp. The present invention provides a cutting tool production technology that can provide an excellent cutting tool having exceptional high performance that can not be obtained except for the cutting tool using the cutting material of the above-mentioned prior invention, which can be maintained over many times of use. And contribute to the expansion of powder metallurgy technology.

[Brief description of the drawings]

FIG. 1 is an enlarged conceptual sectional view of a measuring device and a sample in a description of a method of measuring a bending force of a blade member.

[Explanation of symbols]

 1 ……………………………………………………………………………………………………………………….

Claims (1)

[Claims] 1. A titanium (Ti) powder having a particle size of 100 to 150 μm in a total amount of 100 parts by weight
Parts, an aluminum-vanadium alloy powder having a weight ratio of aluminum (Al) 6: vanadium (V) 4 having a particle diameter of 20 μm or less, and about 5 to 8 parts of a vanadium carbide (VC) powder having a particle diameter of 3 μm or less. A blade material comprising titanium as a main component, comprising a sintered product obtained by compression molding and sintering a composition obtained by mixing the components.