JP3197933U - Easy to sharpen - Google Patents

Abstract

A blade that is easy to sharpen is provided. A local hardened portion 3 having a hardness higher than that of a body 1 is generated at a local portion opposite to the thickness direction with respect to the blade surface of the blade, and the angle of the blade edge is 5 degrees or more. A constant sharpening angle can be maintained by the cutting edge part 2 and the local hardening part 3. [Selection] Figure 1

Description

  In the present invention, in a knife such as a knife, a knife, a planer, etc., the angle between the blade and the sharpening tool when a local hardened portion is generated on the back side opposite to the thickness direction with respect to the blade edge and the blade edge is sharpened. That is, the present invention relates to a blade having a structure capable of sharpening while maintaining a constant sharpening angle (hereinafter referred to as “a sharp blade that is easy to sharpen”).

  In general, a blade only shows its power when it is sharpened. It is said that the craftsmanship of chefs, carpenters, etc. depends on the sharpening technique of the blade. The sharpening force acting from the opposite side of the sharpening surface during sharpening generally acts more strongly on the back side than the cutting edge, and the sharpening angle is not kept constant, and the back side is sharpened much. In order to keep the sharpening angle constant, it is necessary to have a technique to apply the sharpening force uniformly to the sharpening surface. This technology is the key to sharpening technology. In ordinary households and do-it-yourself carpenters, cutlery tools deliver joy and enjoyment. Therefore, there is always a demand to place a knife that can cut well. In order to meet such demands, for example, Utility Model Document 1 proposes a sharpening angle holder that holds a blade and maintains a constant sharpening angle. Utility Model Document 2 proposes a technique for maintaining the sharpening angle by arranging hardened steel on both sides of the blade in the thickness direction and sandwiching the soft iron at the central portion integrally. Moreover, in order to maintain the sharpening angle constant, a power sharpening machine that moves the sharpening tool with power such as an electric motor is commercially available.

  However, the utility model document 1 has a disadvantage that it requires prior adjustment and skill of jigs, and the applicable blades are also limited. The utility model document 2 has a drawback that the manufacturing method of the blade is complicated and the manufacturing cost becomes high, and it has not been put on the market yet. In addition, since the power sharpener is expensive and complicated to handle, it has drawbacks for use in general households.

Utility model literature

Utility model document 1

  Utility Model No. 3108849

Utility model document 2

  Utility Model 49-43262

  In view of the conventional drawbacks as described above, there is a demand for a blade having an inexpensive structure that can easily maintain a constant sharpening angle when sharpening. The present invention meets this need. Aiming to provide an “easy to sharpen blade” that makes it possible to maintain a constant sharpening angle by generating a hardened part in the local area of the blade at low cost by making full use of the current hardened processing technology. It is said.

  In order to achieve the above-described object, the present invention provides a blade that is locally hardened by laser, micro-shot blasting, or the like on a portion opposite to the wall thickness direction (hereinafter referred to as “rear surface”) with respect to the blade surface of the blade. There is provided an “easy to sharpen blade” characterized by generating a harder portion (hereinafter referred to as “locally hardened portion”) than a body supporting a surface (hereinafter referred to as “body”).

  As is clear from the above description, the following effects can be obtained by the present invention.

  When sharpening, the local hardened portion generated in the local portion on the back surface of the blade can suppress the amount of sharpening on the back surface side, and can keep the sharpening angle constant. Therefore, it is possible to easily regenerate a sharp blade with a small amount of grinding and time without using a complicated sharpening tool or an expensive power sharpening machine.

It is sectional drawing of the thickness direction of the cutter which shows the structure of this invention. (A) is a cross-sectional view before sharpening, and (b) is a cross-sectional view after sharpening. It is sectional drawing of the thickness direction of the cutter of Example 2 of this invention. (A) is a cross-sectional view before sharpening, and (b) is a cross-sectional view after sharpening. It is a sketch of the kitchen knife which produced the spot-like local hardening part by this invention. It is a sketch of the kitchen knife which produced | generated the continuous local hardening part by this invention.

  Hereinafter, the form of this invention is demonstrated based on FIGS.

  The structure and effect of the present invention will be described with reference to FIG. As shown in FIG. 1A, a material that hardens by quenching or shot blasting, such as high carbon steel or martensitic stainless steel, is used for the blade according to the present invention. A local hardened portion 3 having a depth of 2 mm or less from the surface is generated in the local portion of the back surface 4 by local quenching with a laser. That is, the blade surface 7 including the blade edge 2 and the local hardened portion 3 have a structure sandwiching the relatively soft body 1. When sharpening, the sharpening force from the blade surface 7 side generally acts more strongly on the back surface 4 side than the blade edge 2. However, as shown in FIG. 1B, the back surface 4 side is not preferentially sharpened by the presence of the local hardened portion 3. The sharpening angle is kept constant, and the sharpening surface 5 uniformly strikes and sharpens the surface of the sharpening tool. Accordingly, the surface 8 after sharpening is formed with a small amount and time of the sharpened portion 6, and the blade edge 2 can be sharpened sharply. Even at home, sharpness can be easily regenerated without using a sharpening angle holding tool or an expensive power sharpening machine and using a normal sharpening tool such as a grindstone without requiring a sharpening skill. Subsequent blade attachment is performed as needed. Moreover, the shape of the local hardening part 3 can exhibit the effect of this invention, even if it is a continuous form or a discontinuous form.

  The recommended depth of quenching is 2 mm or less.

  FIG. 2 shows an embodiment of the present invention in which the angle of the blade edge 2 and the angle of the body part on the back surface 4 side are different and the cross section in the thickness direction is convex. This shape can be found on a vegetable knife or the like. As shown in FIG. 2A, in this case, the local curing portion 3 is generated in a local portion that is separated from the blade edge 2 by 5 mm or more. At the beginning of sharpening, the convex part of the body 1 between the cutting edge 2 and the local hardening part 3 is temporarily sharpened. However, after that, as shown in FIG. 2B, the sharpening angle is kept constant, the surface 8 after sharpening is formed, and the cutting edge 2 is sharpened well. Therefore, the effect of this invention can be demonstrated.

  In order to maintain the sharpening angle, the recommended value is to set the distance between the cutting edge and the locally hardened portion, that is, the sharpening width to 5 mm or more.

  FIG. 3 shows an embodiment of the present invention in which the local hardened portion 3 is generated in a spot shape along the blade edge 2. The shape of the local hardening part 3 can arbitrarily select a rectangle or the like in addition to a circle. The sharpening angle can be maintained constant by the local hardening part 3, so that the effect of the present invention can be exhibited.

FIG. 4 shows an embodiment of the present invention in which the local hardening portion 3 is curved along the curved cutting edge 2. The effect of the present invention can be demonstrated.

  Table 1 is a table showing the configuration and manufacturing cost, ease of sharpening, and sharpness of the cutting edge portion, body portion, and local hardening portion of the present invention.

  Invention Example 1 is an example of using chromium-molybdenum steel, which can quench the entire blade. The cutting edge is quenched to a hardness of HRC55. A sharpening angle is set to 20 degrees, a sharpening width is set to 15 mm, and local hardening is performed by a laser to generate a locally hardened portion having a hardness of HRC55. Since a constant sharpening angle can be maintained by the cutting edge part and the local hardening part, the cutting edge can be sharpened easily, and the effect of the present invention is exhibited.

  Invention Example 2 is an example of the present invention in which a locally hardened portion is generated with a sharpening width of 10 mm. A constant sharpening angle can be maintained. The effect of this invention is demonstrated.

  Example 3 of the present invention is an example of the present invention when the angle of the sharpening surface 5 is different between the blade edge 2 and the back surface 4, which has already been described with reference to FIG.

  Comparative Example 1 is an example of a conventional form having no local curing portion. Ease of sharpening is poor. The sharpness is poor with a small amount of sharpening.

  Comparative Example 2 is an example of the technique proposed by Utility Model Document 2. This is an example in which steel is disposed on the blade surface and the back surface, and soft iron is disposed in the central portion and sandwiched integrally. Ease of sharpening and sharpness are good, but it is not popular because of the excessive manufacturing cost of blades.

  Comparative Example 3 is for hair shave, and the sharpening width is 20 mm and the blade edge angle is 4 degrees, which is extremely sharp. This is a limited use for a blade and is not covered by the present invention.

  The present invention is used in the industry for manufacturing a blade.

DESCRIPTION OF SYMBOLS 1 Body 2 Cutting edge 3 Local hardening part 4 Back surface 5 Polishing surface 6 Sharpening part 7 Blade surface 8 Surface after sharpening

Claims (2)

  An easy-to-sharp blade characterized by generating a locally hardened portion having a depth of 2 mm or less and having a hardness higher than that of the body, at a local portion that is 5 mm or more away from the blade edge on the opposite side to the blade surface of the blade. .   2. An easy-to-sharp blade according to claim 1, wherein the angle of the blade edge is 5 degrees or more.

Images