Kitchen knife and manufacturing method of the same

Abstract

To provide a kitchen knife which can be produced at relatively low costs while having a pattern formed at a blade edge.SOLUTION: A kitchen knife of the invention includes: a back side member located at the back side; and a blade side member located at the blade side and formed by a laminate material in which two or more different metal materials are laminated. The blade side member is thinner than the back side member. Further, the blade side member is processed so that at least a part thereof is curved when viewed from the blade edge side and then joined to the back side member. At least one of grinding and polishing is performed after joining to form a pattern.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] One aspect of the present invention relates to a kitchen knife.

Background Art

[0002] Conventionally, there has been a kitchen knife with a pattern on the blade body by bending a material in which multiple types of metal plates are laminated and then performing grinding, polishing, etc. Such a conventional kitchen knife is disclosed in, for example, Patent Document 1.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the above conventional kitchen knife uses a material in which multiple types of metal plates are laminated, there are problems such as the cost of the material being higher than that of a kitchen knife using a single metal plate as the material, and the manufacturing cost of the kitchen knife being high.

Means for Solving the Problems

[0005] In order to solve the above problems, the present invention provides the following means.

[0006] A kitchen knife according to one aspect of the present invention includes a back member located on the back side, and a blade-side member located on the blade side and formed of a laminate in which two or more different metal materials are laminated, The blade-side member is processed such that at least a part of a laminate thinner than the back member is curved as viewed from the blade tip side and then joined to the back member, and a pattern is formed by performing at least one of grinding and polishing after the joining.

[0007] The above-described knife uses laminated material for the blade side and a material other than laminated material for the back side, and a pattern can be formed on the blade side portion made of laminated material. In such a knife, a single layer of material, which is cheaper per unit than laminated material, can be used for the back side, thus reducing material costs and making it possible to manufacture the knife at a lower cost than a knife made entirely of laminated material.

[0008] Furthermore, since the blade-side member and the back-side member can be made of different materials, it is possible to use a material that provides excellent cutting performance for the blade-side member and a material that is less prone to breakage for the back-side member, allowing for the selection of materials suitable for each purpose.

[0009] Furthermore, since different metal materials are exposed at the cutting edge of the blade-side component, if metal materials with different wear properties are used, the cutting edge will become saw-toothed due to wear, resulting in a sharper cutting edge.

[0010] In the above-mentioned knife, preferably, The blade-side component is machined to have a wavy shape when viewed from the cutting edge side.

[0011] According to the above-mentioned knife, a visually appealing wave-shaped pattern can be formed on the blade-side component by grinding or polishing.

[0012] In the above-mentioned knife, preferably, The blade-side member is subjected to grinding and polishing, so that different metal materials of the blade-side member are exposed on at least one of its front and back surfaces, forming a pattern.

[0013] With the above configuration, it is possible to create a knife with a pattern in which different metal materials are exposed on both or one of the front and back surfaces.

[0014] In the above-mentioned knife, preferably, When the blade-side member is processed to be curved, its thickness, as viewed from the cutting edge side, is approximately the same as that of the back-side member.

[0015] According to the kitchen knife having the above-described configuration, when joining the blade-side member and the back-side member, since the center lines of both can be aligned by placing both on a flat table, it is possible to join both while suppressing misalignment without using a special jig or the like during joining.

[0016] In the above kitchen knife, preferably, it is joined such that the center line in the thickness direction of the blade-side member substantially overlaps with the center line in the thickness direction of the back-side member.

[0017] According to the kitchen knife having the above-described configuration, it is possible to join the back-side member and the blade-side member while minimizing the misalignment between them.

[0018] In the above kitchen knife, preferably, the center line in the thickness direction of the blade-side member is a line passing through the middle between the line connecting the front surface-side vertices of the blade-side member and the line connecting the back surface-side vertices as viewed from the blade tip side.

[0019] In the above kitchen knife, preferably, the blade-side member is subjected to etching.

[0020] According to the kitchen knife having the above-described configuration, by taking advantage of the characteristics of different metal materials forming the blade-side member with respect to chemical changes, it is possible to clearly form a more beautiful pattern.

[0021] A method for manufacturing a kitchen knife according to one aspect of the present invention includes a bending step of processing a blade-side member formed of a laminate in which two or more different metal materials are laminated so that at least a part thereof is curved as viewed from the direction of the blade tip, a joining step of joining the blade-side member to the back-side member, a grinding and polishing step of performing at least one of grinding and polishing on the joined blade-side member and back-side member to form a pattern.

[0022] When manufacturing a kitchen knife having a pattern by the above steps, it is possible to manufacture a kitchen knife having a pattern at a relatively low cost.

Brief Description of the Drawings

[0023] [Figure 1] Figure 1 is a plan view of the kitchen knife before joining. [Figure 2] Figure 2 is a plan view of the kitchen knife after joining and before grinding. [Figure 3] Figure 3 is a view of the kitchen knife after joining and before grinding, seen from the cutting edge side. [Figure 4] Figure 4 is a plan view of the kitchen knife after polishing. [Figure 5] Figure 5 is an enlarged conceptual view of the pattern-expressing part of the blade-side member after polishing. [Figure 6] Figure 6 is an enlarged plan view of the pattern-expressing part of the blade-side member after polishing. [Figure 7] Figure 7 is a flowchart showing the manufacturing process of the kitchen knife.

Embodiments for Carrying Out the Invention

[0024] A kitchen knife according to one embodiment of the present invention is manufactured by joining a blade-side member formed of a laminate in which a plurality of metal materials are laminated and a back-side member made of a single material, and then performing grinding and polishing. The kitchen knife has a pattern formed on the blade-side member.

[0025] Hereinafter, a kitchen knife according to one embodiment of the present invention will be specifically described with reference to the drawings. However, the embodiments and examples described below are merely examples of the present invention and do not limitatively interpret the technical scope of the present invention. In each drawing, the same reference numerals are assigned to the same components.

[0026] Figure 1 is a plan view of the kitchen knife 1 before the back-side member 2 and the blade-side member 3 are joined.

[0027] The back member 2 is formed from a single flat metal plate and is located on the back side when joined to the blade-side member 3. The back member 2 is made of, for example, martensitic stainless steel such as SUS420J2. In plan view, the back edge of the back member 2 is straight, while the edge on the blade side that joins to the blade-side member 3 is curved. The back member 2 has projections 21 and 22 used for positioning when joining to the blade-side member 3. Projection 21 is provided on the front end side of the back side of the back member 2. Projection 22 is provided on the rear end side of the blade side of the back member 2. The back member 2 has a hole 23 on the rear end side for attaching a handle (not shown). The back member 2 is made of, for example, a metal material with a thickness of 2.5 mm.

[0028] The blade-side member 3 is formed from a laminated material made by stacking two or more different metal materials, and is located on the blade side when joined with the back-side member 2. The laminated material of the blade-side member 3 is, for example, a material in which different alloys are stacked in layers of 10 to 100. Specifically, the laminated material can be a metal in which a metal with iron (Fe) as the base with 0.65% carbon (C), 14.00% chromium (Cr), and 0.15% molybdenum (Mo) added, and a metal with iron (Fe) as the base with 1.00% carbon (C), 15.00% chromium (Cr), 1.00% molybdenum (Mo), 0.25% vanadium (V), and 1.55% cobalt (Co) added are alternately stacked. However, the laminated material of the blade-side member 3 can be arbitrarily selected.

[0029] The blade-side member 3 is flat before the bending process. The edge of the blade-side member 3 that is joined to the back-side member 2 is curved in the same shape as the edge of the opposing back-side member 2. The blade-side member 3 has projections 31 and 32 that are used for positioning during joining, at positions opposite to projections 21 and 22 of the back-side member 2. Projection 31 is provided on the front end side of the back side of the blade-side member 3. Projection 32 is provided on the rear end side of the back side of the blade-side member 3. In its flat state before processing, the thickness of the blade-side member 3 is, for example, 2.2 mm. The thickness of the blade-side member 3 before bending is thinner than that of the back-side member 2.

[0030] The back member 2 and the blade-side member 3 described above are processed in the manufacturing process described below to become a kitchen knife 1. As shown in Figure 7, the manufacturing process for kitchen knife 1 includes a curving process S1 in which the blade-side member 3 is curved, a joining process S2 in which the back member 2 and the blade-side member 3 are joined together, a grinding process S3 in which the joined back member 2 and blade-side member 3 are ground, a polishing process S4 in which they are polished, an etching process S5 in which they are etched, and a buffing process S6 in which they are buffed.

[0031] As described above, the blade-side member 3 is flat before processing, but in the curving process S1, it is curved so that it becomes wavy when viewed from the blade tip side, resulting in the shape shown in Figures 1 and 3. Figure 3 shows the state in which the blade-side member 3 and the back-side member 2 are joined, as viewed from the blade tip side indicated by arrow A in Figure 1. In Figure 3, the back-side member 2 has a front surface 2a and a back surface 2b. The curvature of the blade-side member 3 can be arbitrarily determined, but in the completed state as a kitchen knife 1, it is curved to the extent that a pattern is formed on at least one of the front surface and the back surface. As shown in Figure 3, the blade-side member 3 of this embodiment has a shape in which the wavy shape is periodically repeated when viewed from the blade tip side. By making it a shape in which the wavy shape is repeated when viewed from the blade tip side, the completed kitchen knife 1 has a periodic wavy pattern that is aesthetically pleasing.

[0032] The curved blade-side member 3 has a thickness of 2.5 mm, the same as the thickness of the back-side member 2, so that it is joined to the back-side member 2 at their respective centerlines without misalignment. As shown in Figure 3, the thickness of the curved blade-side member 3 is the distance between the line connecting the multiple vertices 33a on the front surface 3a of the blade-side member 3 and the line connecting the multiple vertices 33b on the back surface. In this specification, the straight line passing through the middle of the line connecting the multiple vertices 33a on the front surface 3a of the blade-side member 3 and the line connecting the multiple vertices 33b on the back surface is called the centerline 3c of the curved blade-side member 3.

[0033] The curvature of the blade-side member 3 can be performed by various methods, such as applying press processing to the blade-side member 3 multiple times. The curvature of the blade-side member 3 may also be performed by other methods.

[0034] The curved blade-side member 3 is joined to the back-side member 2 in joining process S2. The joining process for joining the back-side member 2 and the blade-side member 3 is performed, for example, by placing the back-side member 2 and the blade-side member 3 on a table with their edges aligned so that the positioning protrusions 21 and 22 and the protrusions 31 and 32 face each other, and then performing brazing. As described above, both the curved blade-side member 3 and the back-side member 2 are 2.5 mm thick and are at the same height when placed on the table. When performing the joining process, as shown in Figure 3, when viewed from the cutting edge side, the center line 3c of the blade-side member 3 coincides with the center line of the back-side member 2. Brazing is performed using, for example, phosphor bronze solder, but is not limited to this, and silver solder may also be used. As a result, the blade-side member 3 and the back-side member 2 are joined together as shown in Figure 2.

[0035] After joining the back member 2 and the blade-side member 3, the joined materials are subjected to a predetermined treatment, and then both are ground and polished to finish as a kitchen knife 1. After joining the back member 2 and the blade-side member 3, the positioning protrusions 21, 22, 31, and 32 are removed by grinding or the like, resulting in the state shown in Figure 4. In the grinding process S3, the joined back member 2 and blade-side member 3 are ground from the front and back surfaces, making them thinner towards the cutting edge. Then, in the polishing process S4, the surface is smoothed by polishing at least the blade-side member 3 so that it becomes thinner towards the cutting edge.

[0036] During the grinding process S3 or polishing process S4, two or more metal materials from the laminated material forming the blade-side member 3 are exposed on the front and back surfaces, and patterns appear on the surface of the blade-side member 3, for example, as shown in Figures 4 and 6. Figure 5 is a conceptual diagram showing an enlarged view of the patterned area of ​​the polished blade-side member 3. As shown in Figure 5, patterns are formed on the front and back surfaces of the blade-side member 3 by the exposure of layers 301, 302, 303, 304, and 305, which are different metal materials forming the blade-side member 3. Note that Figure 5 shows the opposite side from Figures 4 and 6, so the formed patterns are different. However, at this point, the boundaries of the exposed metal materials may not be clearly visible.

[0037] Next, an etching process S5 is performed on the knife 1, which has been ground and polished, in which etching is carried out using, for example, a liquid agent. The metal material exposed on the front and back surfaces of the blade-side member 3 after etching becomes easier to distinguish between layers due to the difference in solubility, resulting in a clear pattern being visible.

[0038] Next, a buffing process S6 is performed on the knife 1, particularly the blade-side member 3. Conventional buffing methods can be used. Buffing the knife 1 makes the formed pattern more clearly visible. Note that buffing is not necessarily required.

[0039] Furthermore, the cutting edge of the blade-side member 3 is sharpened to make it usable as a kitchen knife. Alternatively, it may be provided as a kitchen knife without sharpening.

[0040] In this way, a knife 1 as shown in Figure 4 is obtained. The knife 1 is completed by connecting a handle (not shown) to the rear end where the hole 23 is provided.

[0041] [Differentiation] The following modifications can be applied to the knife 1 and the method for manufacturing the knife 1, which were specifically described in the embodiments.

[0042] In this embodiment, the back member 2 and the blade-side member 3 were ground and polished after joining, but the knife 1 may be formed by grinding or polishing only.

[0043] In the curving process S1 of the embodiment, the blade-side member 3 is curved so that it has a wavy shape throughout when viewed from the cutting edge side. However, it is also possible to process only a part of the blade-side member 3 to be curved. In other words, there may be one or more curved sections in the curving process. In this case, grinding and polishing may form a pattern only on the curved portion of the blade-side member 3.

[0044] Furthermore, the blade-side member 3 may be processed so that a pattern appears on only one of its front or back surfaces.

[0045] In this embodiment, the blade-side member 3 is processed so that different patterns appear on the front and back surfaces, but it may also be processed so that the same pattern appears on the front and back surfaces.

[0046] In this embodiment, a single flat metal material was used as the back member 2, but multiple layers of metal material may be used depending on the purpose.

[0047] In this embodiment, the blade-side member 3 was processed by curving to have approximately the same thickness as the back-side member 2, but it is also possible to process them to have different thicknesses. However, when using the blade-side member 3 after such curving, if one attempts to align the centerlines when joining the blade-side member 3 and the back-side member 2, it becomes impossible to place them on the same flat surface, requiring either a step or the use of a jig.

[0048] In the joining process of this embodiment, the back member 2 and the blade-side member 3 were joined by brazing, but they may also be joined using other existing methods such as laser welding, gas welding, arc welding, electron beam welding, or other welding methods.

[0049] Furthermore, although the embodiment was described assuming the use of a blade-side member 3 with a uniform thickness, a blade-side member 3 that is formed to become thinner from the back side towards the cutting edge side may also be used.

[0050] [Features of this embodiment] The knife 1 of this embodiment has the following features, for example.

[0051] The knife 1 comprises a back member 2 and a blade-side member 3. The blade-side member 3 is made of a laminated material that is thinner than the back member 2, processed so that at least a portion of it is curved when viewed from the cutting edge side, and then joined to the back member 2. A pattern is formed on the blade-side member 3 by grinding and polishing, or at least one of these processes. In such a knife 1, a single layer of metal material, which is cheaper per unit, can be used for the back member 2 than the laminated material of the blade-side member 3, thus reducing material costs and making it possible to manufacture the knife at a lower cost than a knife made entirely of laminated material.

[0052] Furthermore, since the blade-side member 3 and the back-side member 2 can be made of different materials, it is possible to use a material that can produce excellent cutting performance for the blade-side member 3 and a material that is less prone to breakage for the back-side member 2, making it easier to select materials that are suitable for each purpose.

[0053] Furthermore, since different metal materials appear at the cutting edge of the blade-side member 3, if metal materials with different wear properties are used to form each layer of the blade-side member 3, the cutting edge will become saw-like, resulting in a sharper cutting edge.

[0054] In the kitchen knife 1, it is preferable that the blade-side member 3 is processed to have a wavy shape when viewed from the cutting edge side. In such a kitchen knife 1, a wavy pattern with excellent aesthetic appeal can be formed on the blade-side member 3 by grinding or polishing.

[0055] In the knife 1, it is preferable that the blade-side member 3 is subjected to grinding and polishing, so that different metal materials of the blade-side member 3 are exposed on at least one of the front and back surfaces, thereby forming a pattern. In such a knife 1, the knife can have a pattern in which different metal materials are intermittently exposed on both or one of the front and back surfaces.

[0056] In the knife 1, it is preferable that the blade-side member 3, when processed to have a wavy shape, has a thickness that is approximately the same as that of the back-side member 2 when viewed from the tip side. In this case, when joining the blade-side member 3 and the back-side member 2, the centerlines of both can be aligned by laying them flat on a surface, so that they can be joined together while minimizing misalignment without using special jigs or steps during joining.

[0057] In the knife 1, it is preferable that the center line 3c in the thickness direction of the blade-side member 3 is joined to the back-side member 2 such that it substantially overlaps with the center line in the thickness direction of the back-side member 2. The center line 3c in the thickness direction of the blade-side member 3 is the line that passes through the midpoint between the line connecting the vertices 33a on the front side of the blade-side member 3 and the line connecting the vertices 33b on the back side, as viewed from the tip side of the blade. In this way, the back-side member 2 and the blade-side member 3 can be joined together while minimizing the misalignment between them.

[0058] In the knife 1, it is preferable to apply etching to the blade-side member 3. This causes the different metal materials forming the blade-side member 3 to undergo different chemical changes, resulting in the formation of more beautiful and clearly defined patterns.

[0059] Furthermore, the manufacturing method for the knife 1 includes at least one of the following steps: a curving step S1, a joining step S2, a grinding step S3, and a polishing step S4. In the curving step S1, the blade-side member 3, which is formed from a laminated material in which two or more different metal materials are stacked, is processed so that at least a portion of it is curved when viewed from the direction of the cutting edge. In the joining step S2, the blade-side member 3 is joined to the back-side member 2. In the grinding step S3, at least the blade-side member 3 is ground. In the polishing step S4, at least the blade-side member 3 is polished. By manufacturing the knife 1 having a pattern on the blade-side member 3 using these steps, a knife with a pattern can be manufactured at a relatively low cost. [Explanation of Symbols]

[0060] 1…Kitchen knife 2…Rear side member 3…Blade-side member 21, 22, 31, 32... protrusions

Claims

1. A back side member located on the back side; A knife having a blade side member located on the blade side and formed of a laminated material in which two or more different metal materials are laminated, The blade side member, which is thinner than the back side member, is processed to have a wavy shape when viewed from the cutting edge side, and the thickness when viewed from the cutting edge side is made the same as that of the back side member before being joined to the back side member. After joining, the blade side member and the back side member are subjected to at least one of grinding and polishing, so that the different metal material is exposed on at least one of the front surface and the back surface to form a pattern. Knife.

2. The blade side member is joined so that a center line in a thickness direction of the blade side member substantially overlaps with a center line in a thickness direction of the back side member.

2. The knife according to claim 1.

3. a center line in the thickness direction of the blade side member is a line passing through the middle between a line connecting vertices on the front surface side of the blade side member and a line connecting vertices on the back surface side of the blade side member when viewed from the cutting edge side; 3. The knife according to claim 2.

4. The blade side member is etched. The knife according to any one of claims 1 to 3.

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