JPH04108482A - Household/business incision press-fit implement - Google Patents

Abstract

PURPOSE:To improve the cuttability, corrosion resistance and durability by forming a diamond-like carbon film on the outermost surface of the base material surface. CONSTITUTION:A stainless steel blade is washed and dried, and thereafter, installed so that the blade tip becomes right opposite against the flow direction of molybdenum vapor, on a base material supporting base of a reactor of a spatter vapor deposition device having an evaporation source of molybdenum in the inside. Subsequently, pressure in the reactor is exhausted to about 5 pascals, the evaporation source is heated to about 2100 deg.C and after molybdenum vapor is generated, a shielding plate between the evaporation source and the base body is opened and closed for 1-5 seconds. Next, a base material is installed in the reactor in which a coil-like tungsten wire is installed in the inside, and after the reactor is exhausted to about 5 pascals, methane is led in so as to become about 3% in capacity concentration, pressure in the reactor is adjusted to about 30 pascals, and under this atmosphere, an electric furnace is adjusted to about 800-850 deg.C, and the tungsten wire is conducted electrically and held at about 2000 deg.C.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to razors, cutters, kitchen knives for home or office use,
This relates to improvements in incision and press-fit instruments such as injection needles.

(Prior art) Razors, cutters, knife scissors for household or office use,
Cutting and press-fitting instruments such as injection needles are often used to cut living things, vegetables, meat, etc. into paper, plastic film, and other materials, and they are also used when cutting on hard materials such as countertops and cutting boards. Since the target object may be somewhat acidic or alkaline, it must have excellent cutting and cutting power.
It is required to be durable and have high corrosion resistance. Conventionally, the instruments used in this field are mainly metals, metal alloys, ceramics, metals,
Metal alloys coated with ceramics have been used.

(Problem to be solved by the invention) However, when conventional products cut, incise, or press-fit highly corrosive materials, the cutting quality, that is, the cutting force and cutting force, decrease rapidly, and the durability is poor and the blade surface deteriorates. This has disadvantages such as increased frictional resistance due to corrosion.

The present invention aims to provide an incision and press-fitting instrument for home or office use that eliminates these drawbacks.

(Means for Solving the Problems) As a result of various studies to solve these problems, the inventors of the present invention have found that not only machinability and corrosion resistance, but also durability when cutting different materials frequently are obtained. They succeeded in obtaining a comprehensively high-performance incision and press-fitting instrument with excellent performance, leading to the present invention.

That is, the present invention relates to an improved cutting and press-fitting tool for household or office use, which is characterized in that the outermost surface of the base material is coated with a diamond-like carbon film. The main focus is on incisions and press-fit instruments.

The present invention will be explained in detail below.

The present inventors previously invented a method for improving the performance of a conventionally known ceramic blade for a microtome by coating it with a diamond film, and filed a patent application (Japanese Patent Application No. 60-49545).
(Japanese Patent Application No. 60-141815), but the present invention is based on this and has been improved.

The base material of the household or office cutting and press-fitting instruments of the present invention is iron, bronze, and stainless steel (hereinafter referred to as SUS).
Examples include metals such as cemented carbide metals, ceramics such as zirconia and alumina, and special ceramics such as HIP-treated zirconia and alumina.

The greatest feature of the present invention is that the outermost surface of these base materials is coated with a diamond-like carbon film. It is now possible to provide household, office, cutting, and press-fitting tools that have significantly improved durability when frequently used for cutting. Further, it is preferable that the diamond content in this diamond-like carbon film is 80% by volume or more, and if it is less than this, satisfactory cutting and cutting force cannot be obtained. In the present invention, the base material is first machined or molded to give it a sharp cutting edge, and then the surface is processed.
If the thickness of this diamond-like carbon film is less than 100 mm, it will have poor durability, and if it exceeds 5,000 mm, the frictional resistance with the object to be cut, incised, or press-fitted will increase, and the thickness of 100 to 5,000 range, preferably 300-30
It is better to set it to 00 people. In addition, for items with thin base materials such as razors, 300 to 500 people are recommended, and for items with relatively thick base materials such as kitchen knives and cutters, 10
00 to 3000 people is preferable. In addition, when coating a diamond-like carbon film, it may not be possible to coat it depending on the material of the base material, or the adhesion strength may be relatively weak.
In advance, Mo, W, Ta, St, oxides and nitrides thereof, A1□03, etc., which have relatively strong adhesion strength for a diamond-like carbon film, are deposited on the surface of the substrate as a base using a sputter deposition device or a vacuum deposition device for 50 min. The diamond-like carbon film may be coated after ~200 depositions, preferably 50-100 depositions.

Next, a method for coating the surface of a substrate with a diamond-like film will be described. A hydrocarbon gas (A) is used as the carbon source, and an inert gas such as argon (
A diamond-like carbon film is deposited from hydrocarbons on a substrate by a known hot filament method or plasma CVD method using a mixed gas containing C). The volume ratio of hydrocarbon gas and hydrogen gas (B) is A/B=0.
It can be used in a wide range of 10 to 0.001. Further, it is preferable that the volume ratio of the hydrogen gas, inert gas, and hydrocarbon gas used is A/(B-C) = 0.10 to 0.001, and the substitution ratio of C to B is 50% or less. or,
Examples of the hydrocarbon gas used here include methane, ethane, propane, and ethylene. To carry out this method using the hot filament method, first, a substrate is placed in a reactor, and then the pressure in the reactor is reduced to 0.
After evacuation until the pressure is within the range of 0.001 to 0.01 Torr, a mixed gas of hydrocarbon gas and hydrogen or an inert gas as necessary is introduced into the reactor to reduce the pressure to 10 to 30 Torr.
Adjust to within the Torr range. Several mm to 1 on the top of the base material surface
A coiled tungsten wire is installed at a distance of 0 mm, and electricity is applied to maintain the surface temperature of the coil at 1,950 to 2,100°C. The surface temperature of the base material is preferably maintained at 800 to 1,000°C; the diamond-like carbon film of the present invention will not form below 800°C, and the diamond-like carbon film will form even above 1,000°C. I can't. On the other hand, when using the plasma CVD method, the base material is first placed in the reactor, and then the pressure in the reactor is adjusted to 0.001 to 0.01 To.
After evacuation to a range of rr, a mixed gas of hydrocarbon gas and hydrogen or an inert gas as required is introduced into the reactor. The pressure inside the reactor is adjusted to be within the range of 10 to 30 Torr in order to maintain stable plasma, and then microwave high frequency power is applied to it to generate plasma in the system and to release the base material. Adjust the surface temperature to 800-1000°C. If the substrate temperature is below 800°C, hydrogen may be mixed into the diamond-like carbon film, and if it exceeds 1000°C, there will be a drawback that the precipitated diamond will reversely transform into graphite. By using the above-described thermal filament method or plasma CVD method, hydrocarbons are thermally decomposed by contact with plasma flame, and a diamond film containing diamond or graphite is formed.
A diamond-like carbon film is deposited in the form of a uniform plate to a desired thickness on the surface of the substrate.

FIG. 1 is a side view of a knife as an example of a cutting and press-fitting tool for household and office use, and FIG. 2 is a cross-sectional view taken along the line a-a of this knife to show the state in which the diamond-like carbon film is coated.

The embodiments of the present invention will be specifically described below with reference to Examples, but the present invention is not limited thereto.

The diamond content of the formed diamond-like carbon film was measured and evaluated by the method shown below.

[Method for Measuring Diamond Content] (1) Confirm the composition of the deposited film using X-ray diffraction to confirm the diamond component.

(2) After measuring the specific gravity (B/A) of the diamond-like carbon film formed after dissolving and removing the base material and the underlying deposited film, the diamond content is measured and evaluated using the following formula. True specific gravity of diamond is 3.515, true specific gravity of graphite is 2.2
5. Sample volume A (cc), sample weight B (gr)
, assuming that the sample consists only of graphite and diamond, and assuming that the volume of graphite is W (cc), B = 3.515
(A-W) + 2.25 W (Example) A stainless steel blade with a width of 6 cm, a length of 15 cm, a thickness of 0.4 mm, and a blade angle of 14 @ was washed with pure water and IPA, dried, and then a molybdenum evaporation source was placed inside. The blade was placed on the substrate support of the reactor of a sputter vapor deposition apparatus with the cutting edge directly facing the direction of flow of molybdenum vapor.

Then, the pressure inside the reactor was evacuated to about 5 pass pressure. Next, after heating the evaporation source to 2100°C and generating molybdenum vapor, a thin molybdenum film with a thickness of 80 to 150 mm is formed on the surface of the substrate by opening and closing the shield plate between the evaporation source and the substrate for 1 to 3 seconds. It was vapor deposited.

Next, this base material was placed in a reactor equipped with a coiled tungsten wire inside, and after the reactor was evacuated to 5 Pascals, methane was introduced to a volume concentration of 3%, and the pressure inside the reactor was The temperature was adjusted to 30 Pascals, and in this atmosphere, the electric furnace was adjusted to 800 to 850°C, and when the tungsten wire was energized and maintained at 2,000°C, the base material had a temperature of 1,000 Pascals.
0 to 2,000 membranes were deposited. Next, this stainless steel blade was taken out of the container and the structure of the coating film was examined using an X-ray diffraction device, and diamond components were found.

Subsequently, it was confirmed from the measurement results of specific gravity that the content of diamond components was f90%.

Next, when this stainless steel blade was subjected to a sharpness test (JISTO201), it was found to be 4.7cc. On the other hand, when the same test was performed using a conventionally polished scalpel, the result was 12
It was cc. In addition, as a durability test, a commercially available PVC film (thickness 100μ) was cut with this blade.
After repeating 0 times, the sharpness test described above was performed and the result was 5.3c.
c, whereas the conventional polished blade is 21cc.
Met.

(Effects of the Invention) The present invention provides a cutting and press-fitting instrument for household or office use in which a diamond-like carbon film is formed on the outermost surface of a base material surface, and in particular, a device coated with a film having a diamond content of 80% or more. It has excellent machinability, corrosion resistance, and durability, making it extremely useful for household and office uses.

4,

[Brief explanation of drawings]

FIG. 1 is a side view of a knife showing an example of the incision and enlargement instrument of the present invention, and FIG. 2 is a sectional view taken along line a-a of the cutting edge. Substrate/Coating Diamond-like Carbon Film Pattern Patent Applicant Shin-Etsu Chemical Co., Ltd. Agent/Patent Attorney Ryo Yamamoto --York 1 Figure 2

Claims (1)

[Scope of Claims] 1. A cutting and press-fitting instrument for domestic and office use, characterized in that the outermost surface of the base material is coated with a diamond-like carbon film. 2. The diamond content of the diamond-like carbon film is 80
The household office incision according to claim 1, which has a capacity of % or more.
Press-fitting equipment.