JPS63318984A - Production of edge tool - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing cutlery used in electric razors, hair cutters, garden tree clippers, and the like.

(Prior Art) Materials conventionally used for blades of electric razors include tool steel, Fe-based alloys such as stainless steel, and nickel alloys produced by electroforming. Furthermore, in order to improve the wear resistance and corrosion resistance of the surface, cutlery has been devised in which the surface is coated with ionic compounds such as titanium nitride (TiN) and titanium carbide (TIC) using methods such as ion blating. (For example, Japanese Patent Application Laid-Open No. 61-48
(See Publication No. 392).

However, as mentioned above, in the past, Fe-based alloys such as stainless steel or nickel alloys were used as the base material, and since this base material and the titanium nitride or titanium carbide of the surface coating were different metals, the base material and the titanium carbide were different. The adhesion to the film is weak,
For example, when an impact load from an object to be cut is applied to the tip of a knife,
There was a drawback that the coating material peeled off from the base material, making it impossible to obtain the original performance.

In order to increase this adhesion, we also suggest methods such as applying nickel plating as a base material and then coating it with titanium nitride when the base material is stainless steel, or improving ion blating treatment. However, these methods cannot be expected to dramatically improve adhesion and also have the disadvantage of increasing processing costs.

(Object of the Invention) In view of the above circumstances, the present invention aims to improve the wear resistance and corrosion resistance of the blade by forming a hardened layer on the surface of the blade, while also achieving excellent adhesion between the hardened layer and the base material. It is an object of the present invention to provide a method for manufacturing a cutlery which is high in quality and does not cause peeling of the hardened layer.

(Structure of the Invention) The present invention uses pure titanium or a titanium alloy as a base material, and performs ion processing on the surface thereof to form a hardened layer made of a titanium compound.

In the blade thus manufactured, since the formed hardened layer and the base material are of the same type of metal, the adhesion between them is dramatically improved.

(Example) FIG. 1 is a sectional view of a cutter 1 manufactured by the method of the present invention. This cutter 1 is used as an outer cutter 3 of an electric shaver 2 shown in FIGS. 2(a) and 2(b), and has a cutter hole 1a. This cutter 1 has a base material 4 of titanium or a titanium alloy (for example, Tl-6%AC-4%V).
Vanadium) is used, and a hardened layer 5 made of titanium nitride is formed on its surface.

A method of manufacturing this cutter 1 will be explained based on FIGS. 3(a), (b), and (c).

First, by subjecting the flat base material 4 shown in FIG. 3(a) to sheet metal press (emboss) processing, the unevenness 6 shown in FIG. 1(b) is formed.

At this time, as the base material 4, the altitude is low (HB-125)
By using titanium with a large elongation (35% to 40%), the transfer accuracy of the unevenness 6 is good, there is little variation in the size and shape of the blade hole 1a, and there is an advantage that embossing can be performed without tearing. be.

Next, the surface of this base material 4 is subjected to ion nitriding treatment to form a hardened layer 5 made of nitride ions as shown in FIG. 3(c). This ion nitriding treatment is performed using, for example, an apparatus as shown in FIG. In the vacuum container 7, the base material 4 is used as a cathode, and the surrounding membrane 8 is used as an anode, and when a DC voltage of 300 to 100 OV is applied to cause glow discharge in a mixed gas of nitrogen and hydrogen, the nitrogen gas becomes the cathode. It becomes nitrogen ions nearby and collides with the base material 4, which causes the temperature of the base material 4 to rise from 4500 C to 500 Q.
As the temperature rises to C, nitrogen invades the surface of the base material 4 and nitriding progresses. That is, when this ion nitriding treatment is performed, a hardened layer 5 with nitrogen diffused and permeated into the surface of the base material 4 is formed.
will be formed.

Note that the depth of the hardened layer 5 can be adjusted by changing the processing time.

After performing such surface treatment, the lower surface is ground to the position shown by the dashed line in FIG. 3(C), thereby forming the cutter 1 as shown in FIG. 1. During this grinding, by forming the hardened layer 5 in advance as described above, an edge having the hardened layer 5 can be formed, and burrs at the cutting edge can be reduced.

As described above, in the method of the present invention, titanium or a titanium alloy is used as the base material 4, and the hardened layer 5 is formed by direct ion processing on its surface. As it extends, the base material 4 and the hardened layer 5
The adhesion between the hardened layer 5 and the hardened layer 5 has been dramatically improved compared to the past, and there is almost no fear that the cured layer 5 will peel off.

In addition, as mentioned above, titanium has high ductility, and as shown in Table 1, the bare leg modulus (elastic modulus) E is approximately 1/2 compared to stainless steel and nickel. When used for the outer cutter 3, it can be smoothly bent into an arch shape, and the workability can also be improved.

Furthermore, the outer cutter 3 formed in this way has excellent flexibility and can be brought into close contact with the inner cutter 9 (see FIGS. 2(a) and (b)) without any gaps, which improves the sharpness of the electric razor 1. It also leads to improvement.

As for the ion processing of the surface of the base material 4, in addition to the ion nitriding described above, the hardened layer 5 made of titanium nitride or titanium carbide in Table 1 can be formed by ion blating. This ion blating process uses, for example, an apparatus as shown in FIG. In the figure, when glow discharge is performed inside the furnace 10 and argon gas is turned into plasma,
Deposition vaporized from crucible G heated by power source 11 and heater 12? The substance 13 is ionized and further accelerated at the glow discharge cathode end near the base material 4 to form a hardened layer 5 on the surface. Therefore, a cutter formed by such an ion blasting process, like the cutter 1' shown in FIG. will have the following.

Next, a method for forming the inner cutter 9 of the electric shaver 2 according to the present invention will be explained based on FIG. 7.

First, a base material 4 made of titanium or titanium alloy is punched into the shape of the inner blade as shown in FIG. 7(a), and then subjected to the ion nitriding treatment or ion brating treatment described above to form the shape shown in FIG. 7(b). A hardened layer 5 is formed.

Furthermore, as shown in Figure (c), by grinding or the like on a predetermined surface, it is possible to form a cutting edge having a hardened layer 5, which has a long life and allows the hardened layer 5 to peel off. A worry-free inner cutter 9 can be obtained.

Furthermore, by using titanium, which has a small Young's modulus as described above, as the base material 4, as shown in FIG. This has the effect of allowing the user to shave while enjoying a pleasant shaving sound.

The present invention can also be applied to the manufacture of electric shavers other than the cutter, for example, as shown in FIGS. 9(a) and 9(b).
) A fixed blade 12 or a movable blade 13 of a hair clipper such as a hair cutter 11 shown in FIG. 10, and a knife 14 shown in FIG.
It can also be used for the fixed blade 16 or movable blade 17 of the garden tree clipper 15 shown in FIGS. 11(a) and 11(b). Moreover, as shown in Table 1 above, the specific gravity of titanium is significantly lower than that of stainless steel or nickel, so it is possible to improve operability by reducing the weight of the equipment. Excellent effects can be obtained for large equipment such as.

(Effects of the Invention) As described above, the present invention uses pure titanium or a titanium alloy as a base material, and the surface thereof is subjected to ion processing to form a hardened layer made of a titanium compound. This has the effect of producing blades that have a long service life, have high adhesion between the base material and the hardened layer, and are free from the risk of the hardened layer peeling off. In addition, titanium, which is used as a base material, has a lower Young's modulus and specific gravity than conventionally used stainless steel and nickel, so it can improve workability such as bending and reduce the weight of manufactured blades. It is possible.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a cutlery treated with ion nitriding according to the method of the present invention, Figures 2 (a) and (b) are perspective and cross-sectional views of a general electric shaver, and Figures 3 (a) and (b). (c) is a cross-sectional view showing the manufacturing process of the outer blade of an electric shaver by the method of the present invention, FIG. 4 is a cross-sectional view of an ion nitriding treatment device, FIG. 5 is a cross-sectional view of an ion brating treatment device, and FIG. FIGS. 7(a), 7(b), and 7(c) are cross-sectional views of cutlery subjected to ion blating treatment according to the method of the present invention; FIGS. The figure is a sectional view showing how the inner cutter is used, and Figure 9 (a)
) (b) is a perspective view and a sectional view of a hair cutter having a blade manufactured by the method of the present invention, FIG. 10 is a cutaway perspective view of a knife having a blade manufactured by the same method, and FIG.
1(a) and 1(b) are perspective views of a garden tree clipper having blades manufactured by the same method. 1.1'... cutter, 4... base material, 5... hardened layer. Patent applicant Matsushita Electric Works Co., Ltd. Agent
Patent Attorney Etsushi Kotani Patent Attorney Chief 1) Masamukai Patent Attorney Yasuo Itaya Figure 1 Figure 2 (a) (b) Figure 5 Figure 6 Figure 7 (a) (b) (C) Figure 8

Claims (1)

[Claims] 1. A method for manufacturing cutlery, which comprises using pure titanium or a titanium alloy as a base material, and subjecting the surface of the base material to ion processing to form a hardened layer made of a titanium compound.