WO2024019129A1 - Knife - Google Patents

Knife Download PDF

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Publication number
WO2024019129A1
WO2024019129A1 PCT/JP2023/026687 JP2023026687W WO2024019129A1 WO 2024019129 A1 WO2024019129 A1 WO 2024019129A1 JP 2023026687 W JP2023026687 W JP 2023026687W WO 2024019129 A1 WO2024019129 A1 WO 2024019129A1
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WO
WIPO (PCT)
Prior art keywords
hard particles
cutting edge
metal
edge portion
mass
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Application number
PCT/JP2023/026687
Other languages
French (fr)
Japanese (ja)
Inventor
孝典 西原
佳宏 辰巳
裕樹 北村
Original Assignee
京セラ株式会社
大阪富士工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラ株式会社, 大阪富士工業株式会社 filed Critical 京セラ株式会社
Publication of WO2024019129A1 publication Critical patent/WO2024019129A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
    • B23P15/40—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools shearing tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B9/00—Blades for hand knives

Definitions

  • the present disclosure relates to cutlery.
  • Patent Document 1 knives made of materials whose main components are metal materials have been used. Among these, in recent years, knives made of stainless steel containing nickel and chromium have been widely used.
  • the wiring board according to the present disclosure and the knife according to the present disclosure include a blade having a base portion and a cutting edge portion connected to the base portion and located along the base portion.
  • the base portion includes a first metal
  • the cutting edge portion includes a second metal and a plurality of hard particles having a higher hardness than the second metal.
  • the hard particles include tungsten carbide.
  • the second metal includes at least nickel, chromium, and iron.
  • the iron content in the matrix region where no hard particles are present is 10% by mass or more, and the mass ratio of the iron content to the tungsten content (Fe/W) is 1 or more.
  • FIG. 1 is a plan view showing a cutter according to an embodiment of the present disclosure.
  • FIG. 2 is a plan perspective view of the cutter shown in FIG. 1.
  • FIG. FIG. 2 is a diagram of the cutter shown in FIG. 1 viewed from the cutting edge side.
  • 4 is an enlarged cross-sectional view for explaining region X in FIG. 3.
  • FIG. 5 is an enlarged sectional view of the cutting edge portion side in FIG. 4.
  • FIG. FIG. 6 is an enlarged sectional view showing a cutting edge portion containing hard particles different from the hard particles shown in FIG. 5.
  • FIG. FIG. 2 is an explanatory diagram for explaining one embodiment of the method for manufacturing the cutlery shown in FIG. 1.
  • FIG. FIG. 2 is an explanatory diagram for explaining one embodiment of the method for manufacturing the cutlery shown in FIG. 1.
  • FIG. FIG. 2 is an explanatory diagram for explaining one embodiment of the method for manufacturing the cutlery shown in FIG. 1.
  • FIG. FIG. 1 is a plan perspective view of the cutter shown
  • FIG. 2 is a cross-sectional view illustrating an example of a laser cladding technique in an embodiment of the method for manufacturing a cutlery shown in FIG. 1.
  • FIG. FIG. 2 is a cross-sectional view illustrating another example of the laser cladding technique in the embodiment of the method for manufacturing a cutlery shown in FIG. 1 .
  • 4 is a cross-sectional view of an embodiment of the method for manufacturing a cutlery shown in FIG. 1, and is an enlarged cross-sectional view of a portion corresponding to region X in FIG. 3.
  • FIGS. 1 to 6 A cutter according to the present disclosure will be explained based on FIGS. 1 to 6.
  • the drawings used in the following explanation are schematic, and the dimensional ratios and the like on the drawings do not necessarily match the actual ones.
  • a cutlery 1 includes a blade 1a and a handle 1b connected to the blade 1a.
  • the blade 1a is set to have a shape and size that match the intended use of the cutlery 1.
  • the cutlery 1 is a kitchen knife
  • examples thereof include a Japanese knife (such as a Deba knife or a Santoku knife), a Western knife (such as a beef knife), or a Chinese knife.
  • the blade 1a is set according to the shape of each knife.
  • the shape of the blade 1a is set according to the purpose other than the kitchen knife.
  • the handle 1b connected to the blade 1a is for a person to hold when using the cutlery 1.
  • the handle 1b is also set to have a shape and size suited to the intended use of the cutlery 1.
  • the blade 1a and handle 1b may be formed integrally or separately.
  • the cutlery 1 is not limited to having the handle 1b, and may be composed only of the blade 1a.
  • the blade 1a and the handle 1b are formed separately, and a part of the blade 1a is inserted into the handle 1b, and is fixed to the handle 1b at the insertion part.
  • the handle 1b is made of, for example, wood, resin, ceramics, or metal material.
  • the metal material include rust-resistant materials such as titanium or stainless steel.
  • the resin include ABS resin (a copolymer of acrylonitrile, butadiene, and styrene), polypropylene resin, and the like.
  • the size of the cutter 1 is not limited and can be set appropriately depending on the purpose.
  • the total length Ht1 in the longitudinal direction (x-axis direction) may be 5 cm or more and 40 cm or less.
  • the total length Ht2 in the longitudinal direction (x-axis direction) of the cutting edge portion 2, which will be described later, may be, for example, 2 cm or more and 35 cm or less.
  • the length Ht3 in the width direction (y-axis direction) in the direction perpendicular to the overall length Ht1 of the blade 1a may be, for example, 10 mm or more and 150 mm or less.
  • the thickness Ht4 (z-axis direction) of the blade 1a at the thickest portion may be, for example, 1 mm or more and 5 mm or less.
  • the length (x-axis direction) of the handle 1b and the thickness (z-axis direction) of the handle 1b may also be set appropriately.
  • the thickness of the handle 1b may be 5 mm or more and 30 mm or less.
  • the blade 1a has a base portion 3 and a cutting edge portion 2 connected to the base portion 3 and located along the base portion 3.
  • the base portion 3 includes a first metal.
  • the first metal is not limited, and examples thereof include steel, synthetic steel, stainless steel, and titanium alloy.
  • the synthetic steel includes, for example, at least one metal selected from the group consisting of chromium (Cr), molybdenum (Mo), vanadium (V), tungsten (W), cobalt (Co), and copper (Cu).
  • Examples include materials.
  • Examples of the stainless steel include chromium-nickel type or chromium type.
  • Examples of the titanium alloy include a titanium alloy called 64 titanium, which contains 6% by mass of aluminum (Al) and 4% by mass of vanadium. When the first metal is stainless steel, the corrosion resistance of the base portion 3 against rust and the like can be improved.
  • the first metal is the main component of the base portion 3.
  • the main component means a component exceeding 70% by mass out of 100% by mass of all components constituting the base portion 3.
  • the base portion 3 includes an exposed portion 31 exposed from the handle 1b and a core 32 inserted into the interior of the handle 1b.
  • the exposed portion 31 has a back portion 3A extending along the longitudinal direction (x-axis direction) and an end portion 3C as shown in FIG.
  • the width of the exposed portion 31 is narrowed near the longitudinal tip of the exposed portion 31, and the end portion 3C and the back portion 3A are connected at the tip of the exposed portion 31.
  • the cutting edge portion 2 is connected to the end portion 3C along the end portion 3C.
  • the end portion 3C of the base portion 3 may be parallel to the thickness direction (z-axis direction) of the base portion 3, or may be inclined with respect to the z-axis direction, as shown in FIG. 4, for example. .
  • the end portion 3C of the base portion 3 may be curved or bent with respect to the z-axis direction.
  • the joint area between the base portion 3 and the cutting edge portion 2 becomes large. Therefore, the bonding strength between the base portion 3 and the cutting edge portion 2 is increased, and the durability of the blade 1 is increased.
  • the core 32 is narrower in the width direction (y-axis direction) than the exposed portion 31, and is inserted inside the handle 1b.
  • the core 32 in the cutter 1 according to one embodiment has at least one hole 32a. By inserting a portion of the handle 1b into the hole 32a, the blade 1a and the handle 1b are firmly fixed.
  • the cutting edge portion 2 includes a second metal 2a and a plurality of hard particles 4.
  • the second metal 2a is a metal containing at least nickel (Ni), chromium (Cr), and iron (Fe). If the second metal 2a is a metal containing at least nickel, chromium, and iron, the cutting edge portion 2 will have improved corrosion resistance and will be less likely to crack.
  • the metal containing at least nickel, chromium, and iron include alloys such as Inconel (registered trademark) and Colmonoy (registered trademark).
  • the second metal 2a included in the cutting edge portion 2 may include a metal having a lower hardness (Vickers hardness) than the first metal included in the base portion 3.
  • the cutter 1 can have the advantages of both the first metal and the second metal 2a. That is, the overall strength of the cutter 1 can be increased by the first metal of the base portion 3.
  • the second metal 2a of the cutting edge part 2 reduces the occurrence of cracking or chipping of the cutting edge part 2 due to stress applied when the cutting tool 1 is used, and the durability of the cutting edge part 2 can be improved.
  • the hard particles 4 contained in the cutting edge part 2 have a higher hardness (Vickers hardness) than the second metal 2a contained in the cutting edge part 2, and contain tungsten carbide (WC). With such a configuration, the hardness of the entire cutting edge portion 2 can be improved, and the wear resistance of the cutting edge portion 2 can be improved. Furthermore, the hard particles 4 are made of a material having higher hardness than the second metal 2a. Therefore, when the blade 1 is used, the hard particles 4 come into contact with the object, thereby improving the sharpness of the cutting edge portion 2 with respect to the object.
  • the hard particles 4 may include a material that is not only harder than the second metal 2a but also harder than the first metal. That is, the hard particles 4 may contain a material harder than the first metal other than tungsten carbide. Examples of such materials include cermets containing titanium carbide (TiC), titanium nitride (TiN), tantalum carbide (TaC), vanadium carbide (VC), and the like. In this way, by using the hard particles 4 having sufficient hardness, the sharpness and wear resistance of the cutting edge portion 2 can be further improved.
  • the hard particles 4 may have a Vickers hardness of, for example, 1000 Hv or more and 4000 Hv or less.
  • the hard particles 4 may be contained in a proportion of 2% by volume or more and 25% by volume or less. If the hard particles 4 in the cutting edge portion 2 are contained in a proportion of 2% by volume or more, the sharpness and wear resistance can be further improved. When the hard particles 4 of the cutting edge portion 2 are contained in a proportion of 25% by volume or less, the productivity of laser cladding can be maintained at a high level.
  • the content of hard particles 4 can be determined by observing the cross section of the cutting edge part 2 (a cross section parallel to the yz plane) using a scanning electron microscope, and from the photograph of the observed image, calculating the content of the hard particles 4 with respect to the entire area of the cutting edge part 2. It is sufficient to calculate the area ratio as volume %. Specifically, the content rate of hard particles 4 is calculated as follows. First, cross-sectional observation of the blade edge part 2 is performed at five different positions at approximately equal intervals along the length direction (x-axis direction) of the blade edge part 2. Next, the area ratio of the hard particles 4 is measured at these five locations. The average value of the area ratio of the hard particles 4 at these five locations is determined. By regarding the average value of this area ratio as the content rate of the hard particles 4, the content rate of the hard particles 4 is calculated.
  • the tungsten content in the matrix region where the hard particles 4 are not present may be 15% by mass or less. If the tungsten content is 15% by mass or less, the matrix region where no hard particles 4 are present has high toughness, and the cutting edge portion 2 is less likely to chip.
  • the shape of the hard particles 4 is not limited, and various shapes can be adopted.
  • Examples of the shape of the hard particles 4 include a spherical shape, an ellipsoidal shape, and a polyhedral shape.
  • the hard particles 4 may have a polyhedral shape.
  • an angular polyhedral shape may be used.
  • the hard particles 4 are not limited to those having a regular shape such as a spherical shape, an ellipsoid shape, or a polyhedral shape.
  • the hard particles 4 may have an irregular shape, for example, a shape in which a part is sharp like a needle or a shape in which a part has a depression (a recess 4a as shown in FIG. 6).
  • the hard particles 4 may be particles having a single shape or may be a mixture of particles having various shapes.
  • At least one of the hard particles 4 included in the cutting edge portion 2 may be exposed from the cutting edge portion 2.
  • the cutting edge portion 2 includes a cutting edge 2A and a pair of side surfaces 2c located on both sides of the cutting edge 2A. At least one of the hard particles 4 may be exposed from the side surface 2c of the cutting edge portion 2, or may be exposed from the cutting edge 2A, for example.
  • the hard particle 4 comes into contact with the object when cutting the object using the blade 1. As a result, the sharpness of the cutting edge portion 2 becomes good, and the wear resistance of the cutting edge portion 2 can be improved.
  • a plurality of hard particles 4 are exposed from both side surfaces 2c of the cutting edge portion 2. As shown in FIGS. Therefore, the sharpness and wear resistance of the cutting edge portion 2 are further improved.
  • the hard particles 4 exposed from the cutting edge 2A of the cutting edge portion 2 will come into contact with the object when cutting the object using the knife 1. As a result, the sharpness of the cutting edge 2A can be improved.
  • the recess 4a may be exposed from the surface of the cutting edge portion 2 in at least one of the hard particles 4 having the recess 4a. Since the concave portion 4a is exposed from the surface of the blade edge portion 2, the sharpness of the blade edge portion 2 is further improved. Furthermore, the slipperiness of the blade 1 is further improved due to the reduction in the contact area.
  • the hard particles 4 are inserted into the length direction (x-axis direction) and the width of the base part 3 inside the blade edge part 2. They may be dispersed not only in the direction (y-axis direction) but also in the thickness direction (z-axis direction) of the base portion 3.
  • the hard particles 4 may have a particle diameter of, for example, 5 ⁇ m or more and 50 ⁇ m or less. In order to obtain the hard particles 4 having such a particle size, particles having a particle size of less than 5 ⁇ m and particles having a particle size of more than 50 ⁇ m may be separated using, for example, a sieve.
  • the Vickers hardness of the hard particles 4, the first metal, and the second metal 2a may be measured using a method according to JIS Z 2244 (ISO 6507-2, hereinafter the same). If measurement by this method is difficult, identify the compositions of the hard particles 4, the first metal, and the second metal 2a, prepare samples having almost the same composition as the identified compositions, and measure these samples. It may be measured by a method according to JIS Z 2244.
  • the Vickers hardness of the first metal, the second metal 2a, and the hard particles 4 may be determined as long as the magnitude relationship can be determined. Therefore, even if there is a discrepancy between the identified composition and the composition of the sample, it is allowed as long as it does not substantially affect the magnitude relationship.
  • the cutting edge portion 2 has an iron content of 10% by mass or more in the matrix region where no hard particles 4 are present, and a mass ratio of the iron content to the tungsten content ( Fe/W) is 1 or more.
  • Fe/W mass ratio of the iron content to the tungsten content
  • the cutting edge portion 2 of the cutter 1 becomes less likely to be damaged. It is presumed that if 10% by mass or more of iron is contained in the matrix region where the hard particles 4 are not present, an Fe-rich FeNi alloy is formed. As a result, it is presumed that the thermal expansion coefficient decreases, the thermal stress of the metal decreases, and the occurrence of cracks decreases. There is no upper limit to the iron content in the matrix region where hard particles 4 are not present, and may be, for example, 40% by mass or less.
  • the mass ratio (Fe/W) between the iron content and the tungsten content is 1 or more, that is, the tungsten content is less than the iron content, the iron The higher the content, the more difficult it is for tungsten to dissolve into the matrix. As a result, the increase in hardness of the matrix region is reduced, and the toughness of the cutting edge portion 2 can be improved.
  • the mass ratio (Fe/W) between the content of iron and the content of tungsten is not limited as long as it is 1 or more. For example, the upper limit may be about 20.
  • FIG. 7 to 10 are diagrams for explaining one embodiment of a method for manufacturing the cutter 1 shown in FIG. 1.
  • FIG. One embodiment of the method for manufacturing the cutlery 1 includes, for example, the following steps (a) to (d).
  • a base portion 3 containing a first metal is prepared.
  • the base portion 3 has a shape as shown in FIG.
  • the base portion 3 is prepared, for example, by pressing a stainless steel plate material, punching out a mold of a predetermined cutter 1, and then hardening the mold. In quenching, preheating, quenching, and cooling may be repeated several times. The hardness of the base portion 3 can be increased by hardening.
  • the base portion 3 is heated at a lower temperature than in the quenching that will be performed later.
  • the residual heat can reduce the occurrence of cracks, etc. that tend to occur when high temperatures are reached during quenching.
  • the hardening conditions can be set appropriately depending on the material, and for example, the conditions may be set to heat the base portion 3 at a temperature of 1000° C. or higher.
  • cooling the base portion 3 is rapidly cooled from the hardening temperature. By cooling, the materials activated by quenching can be fixed together.
  • step (b) metal powder, iron-containing metal, and hard particles 4 that constitute the second metal 2a are prepared.
  • the second metal 2a and the hard particles 4 are as described above, and detailed description thereof will be omitted.
  • iron-containing metals include iron, stainless steel, and alloys containing iron as a main component.
  • stainless steel include SUS410L and SUS316.
  • step (c) the metal powder constituting the second metal 2a, the metal powder of the iron-containing metal, and the hard particles 4 are injected onto the end portion 3C of the base portion 3, while the metal powder is and baking metal powder of ferrous metals.
  • the blade member has an iron content of 10% by mass or more in the matrix region where no hard particles 4 are present, and a mass ratio of iron content to tungsten content (Fe/W) of 1 or more. 6 is formed.
  • Examples of the method of baking the metal powder and the iron (Fe)-containing metal powder constituting the second metal 2a include a method of melting and baking with a laser. Such a method includes, for example, a cladding technique using a laser.
  • metal powder constituting the second metal 2a and metal powder of an iron (Fe)-containing metal are applied from the side of the laser beam 7a to the vicinity of the end 3C of the base portion 3.
  • the cladding material 6a containing bodies is supplied from the nozzle 7.
  • the cladding material 6a which is the material constituting the cutting edge portion 2
  • Inert gas 7b is blown toward end portion 3C from further outside of cladding material 6a. This makes it easier for the cladding material 6a to be exposed to the laser beam 7a.
  • the inert gas 7b include argon gas.
  • the inert gas 7b can be discharged from the same path as the laser beam 7a, as shown in FIG. Thereby, the inert gas 7b can be blown against the end portion 3C from inside the cladding material 6a.
  • Hard particles 4 are mixed when dissolving the cladding material 6a.
  • the cladding material 6a other than the hard particles 4 is melted by the laser beam 7a and adheres to the end portion 3C.
  • the hard particles 4 since the hard particles 4 have a high melting point, they are difficult to melt by the laser beam 7a.
  • a portion of the tungsten carbide (WC) of the hard particles 4 decomposes, and the tungsten (W) dissolves into the matrix during processing of the blade member 6. If hard particles 4 are mixed in when melting the cladding material 6a, a plurality of hard particles 4 can be dispersed in the cutting edge portion 2.
  • the iron content contained in the metal powder constituting the second metal 2a must be taken into consideration.
  • the amount of iron derived from the iron-containing metal may be adjusted as appropriate.
  • the amount of iron derived from iron-containing metals may be adjusted to 5% by mass or more, and may be adjusted to about 30% by mass at most.
  • the mass ratio (Fe/W) may be set to 1 or more.
  • step (d) the blade member 6 and the base portion 3 are polished.
  • Polishing is performed using, for example, a polishing stone whose surface is coated with particles of aluminum oxide (Al 2 O 3 ), silicon carbide (SiC), diamond, or a mixture thereof. Polishing may be performed in multiple steps. For example, as shown in FIG. 10, first polishing may be performed along dotted line L1, and then second polishing may be performed along dotted line L2.
  • a base portion 3 as shown in FIG. 7 was manufactured using stainless steel.
  • the metal powder constituting the second metal 2a, the metal powder of iron (Fe)-containing metal, and the hard particles 4 are injected onto the end portion 3C of the obtained base portion 3, while the metal powder is was burned onto the end 3C.
  • the metal powder a mixture of Inconel 600 and a metal containing iron (Fe) was used.
  • SUS410L was used as the iron (Fe)-containing metal.
  • the hard particles 4 particles made of tungsten carbide (WC) were used as the hard particles 4 (tungsten carbide) were used. Adjustments were made so that the metal powder content was 85% by mass and the hard particles 4 (tungsten carbide) were 15% by mass.
  • Iron (Fe)-containing metals are used so that the amount of iron added is as shown in Table 1 (5% by mass, 10% by mass, 15% by mass, 20% by mass, 25% by mass and 30% by mass). did.
  • Baking of the metal powder onto the end portion 3C was performed using an apparatus as shown in FIG. Specifically, a mixture of Inconel 600 and an iron-containing metal (cladding material 6a) was supplied from the nozzle 7 to the vicinity of the end portion 3C of the base portion 3 from the side of the laser beam 7a. Then, when the cladding material 6a was dissolved, the hard particles 4 were mixed. The cladding material 6a other than the hard particles 4 was melted by the laser beam 7a and adhered to the end portion 3C. On the other hand, the hard particles 4 have a high melting point.
  • the cladding material 6a which is the material forming the cutting edge, was melted and was able to be metallically bonded to the end portion 3C of the base portion 3. Furthermore, a plurality of hard particles 4 could be dispersed at the cutting edge. Table 1 shows the proportions of the components constituting the cutting edge of the obtained cutlery (sample Nos. 1 to 6).
  • the strength of the cutting edge portion of the obtained cutlery (sample Nos. 1 to 6) was verified. Specifically, in a drop test, an iron ball was dropped freely onto the cutting edge from a certain height to verify the strength of the cutting edge. It was visually confirmed whether there was any damage such as cracks or chips on the cutting edge. If damage such as cracking or chipping did not occur at the cutting edge, it was evaluated as "absent,” and if it did, it was evaluated as "present.” The results are shown in Table 1.
  • the blades according to the present disclosure have no damage such as cracks or chips at the cutting edge.
  • the mass ratio (Fe/W) between the iron content and the tungsten content is 1 or more, and the iron content is 10% by mass or more ( It can be seen that samples Nos. 1 to 6) have no damage such as cracks or chips at the cutting edge.
  • sample No. 1 was prepared, except that the amount of iron contained in the iron-containing metal and the amount of hard particles 4 added were changed to the amounts shown in Table 2.
  • Cutlery were obtained using the same procedure as for cutlery Nos. 1 to 6. The strength of the cutting edge portion of the obtained cutlery (sample Nos. 7 to 25) was verified in the same manner as above. The results are shown in Table 2.
  • the amount of WC added in the hard particles 4 is 10% by mass or more. It can be made 35% by mass or less.
  • the amount of WC added to the cutting edge portion 2 is set to 10% by mass or more and 35% by mass or less, the content of WC particles increases and wear resistance improves.
  • the blade edge portion 2 is easy to sharpen even if it becomes dull. Thereby, the cutter 1 can be used for a long period of time.
  • the amount of WC added is less than 10% by mass, the content of WC particles becomes low, and the wear resistance tends to decrease.
  • the content of WC in the hard particles 4 can be calculated in volume %.
  • the density of Inconel 600 is 8.42 (g/cm 3 )
  • the density of SUS410L is 7.74 (g/cm 3 )
  • the density of WC is 15.6 (g/cm 3 ).
  • hard particles (WC) 95% by mass (Inconel 600: 90% by mass + SUS410L: 5% by mass): 5% by mass
  • the content of W in the matrix is 2.38% by mass (sample No.
  • the cutting edge portion 2 contains the WC hard particles 4 at a ratio of 2.55% by volume.
  • hard particles (WC) 60% by mass (Inconel 600: 30% by mass + SUS410L: 30% by mass): 40% by mass,
  • a cutlery includes a blade having a base portion and a cutting edge portion connected to the base portion and located along the base portion.
  • the base portion includes a first metal
  • the cutting edge portion includes a second metal and a plurality of hard particles having a higher hardness than the second metal.
  • the hard particles include tungsten carbide.
  • the second metal includes at least nickel, chromium, and iron.
  • the iron content in the matrix region where no hard particles are present is 10% by mass or more, and the mass ratio of the iron content to the tungsten content (Fe/W) is 1 or more.
  • the second metal includes a metal having a lower hardness than the first metal.
  • the hard particles include hard particles having an angular polyhedral shape.
  • the hard particles include a material having a higher hardness than the first metal.
  • the cutting edge portion contains hard particles in a proportion of 2% by volume or more and 25% by volume or less.
  • the tungsten content in the matrix region in which no hard particles are present in the cutting edge portion is 15% by mass or less.
  • the cutting edge portion has a cutting edge and a pair of side surfaces located on both sides of the cutting edge, and at least one of the hard particles is exposed from the side.
  • at least one of the hard particles is exposed from the cutting edge.
  • at least one of the hard particles has a recess, and in at least one of the hard particles having the recess, the recess is located at the cutting edge. exposed from the surface.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Knives (AREA)

Abstract

A knife according to the present disclosure comprises a blade that has a base part and an edge part that is connected to the base part and located along the base part. The base part includes a first metal, and the edge part includes a second metal and a plurality of hard particles having higher hardness than the second metal. The hard particles include tungsten carbide. The second metal includes at least nickel, chromium, and iron. In the edge part, the iron content in a matrix region in which the hard particles are not present is 10% by mass or greater, and the mass ratio (Fe/W) of the iron content and the tungsten content is 1 or greater.

Description

刃物cutlery
　本開示は、刃物に関する。 The present disclosure relates to cutlery.
　従来、金属材料を主成分とする材料からなる包丁が用いられている。その中でも、近年においては、ニッケルおよびクロムを成分とするステンレスからなる包丁が多く用いられている（特許文献１）。 Conventionally, knives made of materials whose main components are metal materials have been used. Among these, in recent years, knives made of stainless steel containing nickel and chromium have been widely used (Patent Document 1).
特開２０００－１８９６８２号公報Japanese Patent Application Publication No. 2000-189682
　本開示に係る配線基板は、本開示に係る刃物は、基体部と、基体部に繋がり基体部に沿って位置する刃先部とを有する刀身を備える。基体部は、第１金属を含み、刃先部は、第２金属と、第２金属よりも高い硬度を有する複数の硬質粒子とを含む。硬質粒子は、炭化タングステンを含む。第２金属が、少なくともニッケルとクロムと鉄とを含む。刃先部は、硬質粒子が存在しないマトリックス領域における鉄の含有量が１０質量％以上であり、かつ鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上である。 The wiring board according to the present disclosure and the knife according to the present disclosure include a blade having a base portion and a cutting edge portion connected to the base portion and located along the base portion. The base portion includes a first metal, and the cutting edge portion includes a second metal and a plurality of hard particles having a higher hardness than the second metal. The hard particles include tungsten carbide. The second metal includes at least nickel, chromium, and iron. In the cutting edge portion, the iron content in the matrix region where no hard particles are present is 10% by mass or more, and the mass ratio of the iron content to the tungsten content (Fe/W) is 1 or more.
本開示の一実施形態に係る刃物を示す平面図である。FIG. 1 is a plan view showing a cutter according to an embodiment of the present disclosure. 図１に示す刃物の平面透視図である。FIG. 2 is a plan perspective view of the cutter shown in FIG. 1. FIG. 図１に示す刃物を刃先側から見た図である。FIG. 2 is a diagram of the cutter shown in FIG. 1 viewed from the cutting edge side. 図３の領域Ｘを説明するための拡大断面図である。4 is an enlarged cross-sectional view for explaining region X in FIG. 3. FIG. 図４における刃先部側を拡大した断面図である。FIG. 5 is an enlarged sectional view of the cutting edge portion side in FIG. 4. FIG. 図５に示す硬質粒子とは異なる硬質粒子を含む刃先部を示す拡大断面図である。FIG. 6 is an enlarged sectional view showing a cutting edge portion containing hard particles different from the hard particles shown in FIG. 5. FIG. 図１に示す刃物の製造方法の一実施形態を説明するための説明図である。FIG. 2 is an explanatory diagram for explaining one embodiment of the method for manufacturing the cutlery shown in FIG. 1. FIG. 図１に示す刃物の製造方法の一実施形態において、レーザークラッディング技術の一例を説明する断面図である。FIG. 2 is a cross-sectional view illustrating an example of a laser cladding technique in an embodiment of the method for manufacturing a cutlery shown in FIG. 1. FIG. 図１に示す刃物の製造方法の一実施形態において、レーザークラッディング技術の他の例を説明する断面図である。FIG. 2 is a cross-sectional view illustrating another example of the laser cladding technique in the embodiment of the method for manufacturing a cutlery shown in FIG. 1 . 図１に示す刃物の製造方法の一実施形態における断面図であり、図３の領域Ｘに相当する部分の拡大断面図である。4 is a cross-sectional view of an embodiment of the method for manufacturing a cutlery shown in FIG. 1, and is an enlarged cross-sectional view of a portion corresponding to region X in FIG. 3. FIG.
　従来の包丁は、刃先が脆く、割れまたは欠けが生じやすい。そのため、優れた耐摩耗性を有し、刃先が破損しにくい刃物が求められている。本開示に係る刃物を、図１～６に基づいて説明する。以下の説明で用いられる図面は模式的なものであり、図面上の寸法比率などは現実のものとは必ずしも一致していない。 Conventional knives have brittle cutting edges and are prone to cracking or chipping. Therefore, there is a need for a cutter that has excellent wear resistance and whose cutting edge is less likely to be damaged. A cutter according to the present disclosure will be explained based on FIGS. 1 to 6. The drawings used in the following explanation are schematic, and the dimensional ratios and the like on the drawings do not necessarily match the actual ones.
　以下、本開示の一実施形態に係る刃物について説明する。一実施形態に係る刃物１は、刀身１ａと、刀身１ａに接続された柄１ｂとを備える。 Hereinafter, a cutlery according to an embodiment of the present disclosure will be described. A cutlery 1 according to one embodiment includes a blade 1a and a handle 1b connected to the blade 1a.
　刀身１ａは、刃物１の用途に合わせた形状および大きさに設定される。刃物１が包丁の場合、例えば、和包丁（出刃包丁または三徳包丁など）、洋包丁（牛刀など）または中華包丁などが挙げられる。刀身１ａは、各包丁の形状に合わせて設定される。刀身１ａが包丁以外（例えば、ナイフまたは手術用器具など）の場合、刀身１ａの形状は、包丁以外の用途に合わせて設定される。 The blade 1a is set to have a shape and size that match the intended use of the cutlery 1. When the cutlery 1 is a kitchen knife, examples thereof include a Japanese knife (such as a Deba knife or a Santoku knife), a Western knife (such as a beef knife), or a Chinese knife. The blade 1a is set according to the shape of each knife. When the blade 1a is something other than a kitchen knife (for example, a knife or a surgical instrument), the shape of the blade 1a is set according to the purpose other than the kitchen knife.
　刀身１ａに接続された柄１ｂは、刃物１を人が利用する際に人が把持するためのものである。柄１ｂも刀身１ａと同様、刃物１の用途に合わせた形状および大きさに設定される。 The handle 1b connected to the blade 1a is for a person to hold when using the cutlery 1. Like the blade 1a, the handle 1b is also set to have a shape and size suited to the intended use of the cutlery 1.
　刀身１ａおよび柄１ｂは、一体的に形成されていてもよく、別体で形成されていてもよい。刃物１は、柄１ｂを備えていることに限定されず、刀身１ａのみで構成されていてもよい。本実施形態においては、刀身１ａおよび柄１ｂが別体で形成されており、刀身１ａの一部が柄１ｂの内部に挿入され、該挿入部で柄１ｂに対して固定されている。 The blade 1a and handle 1b may be formed integrally or separately. The cutlery 1 is not limited to having the handle 1b, and may be composed only of the blade 1a. In this embodiment, the blade 1a and the handle 1b are formed separately, and a part of the blade 1a is inserted into the handle 1b, and is fixed to the handle 1b at the insertion part.
　柄１ｂは、例えば、木材、樹脂、セラミックスまたは金属材料で形成されている。金属材料としては、例えば、チタン系またはステンレス系などのような錆にくい材料が挙げられる。樹脂としては、例えば、ＡＢＳ樹脂（アクリロニトリル、ブタジエンおよびスチレンの共重合体）、ポリプロピレン樹脂などが挙げられる。 The handle 1b is made of, for example, wood, resin, ceramics, or metal material. Examples of the metal material include rust-resistant materials such as titanium or stainless steel. Examples of the resin include ABS resin (a copolymer of acrylonitrile, butadiene, and styrene), polypropylene resin, and the like.
　刃物１の大きさは限定されず、用途に応じて適宜設定される。刃物１の大きさは、例えば、図１および図２に示すように、長手方向（ｘ軸方向）の全長Ｈｔ１が５ｃｍ以上４０ｃｍ以下であってもよい。図１および図２に示すように、後述する刃先部２の長手方向（ｘ軸方向）全長Ｈｔ２は、例えば２ｃｍ以上３５ｃｍ以下であってもよい。図３に示すように、刀身１ａの全長Ｈｔ１と直交する方向の幅方向（ｙ軸方向）の長さＨｔ３は、例えば１０ｍｍ以上１５０ｍｍ以下であってもよい。図３に示すように、刀身１ａの厚みＨｔ４（ｚ軸方向）は、最も厚い部分で、例えば、１ｍｍ以上５ｍｍ以下であってもよい。柄１ｂの長さ（ｘ軸方向）および柄１ｂの厚み（ｚ軸方向）も、適宜設定すればよい。例えば、柄１ｂの厚みは、５ｍｍ以上３０ｍｍ以下であってもよい。 The size of the cutter 1 is not limited and can be set appropriately depending on the purpose. As for the size of the cutter 1, for example, as shown in FIGS. 1 and 2, the total length Ht1 in the longitudinal direction (x-axis direction) may be 5 cm or more and 40 cm or less. As shown in FIGS. 1 and 2, the total length Ht2 in the longitudinal direction (x-axis direction) of the cutting edge portion 2, which will be described later, may be, for example, 2 cm or more and 35 cm or less. As shown in FIG. 3, the length Ht3 in the width direction (y-axis direction) in the direction perpendicular to the overall length Ht1 of the blade 1a may be, for example, 10 mm or more and 150 mm or less. As shown in FIG. 3, the thickness Ht4 (z-axis direction) of the blade 1a at the thickest portion may be, for example, 1 mm or more and 5 mm or less. The length (x-axis direction) of the handle 1b and the thickness (z-axis direction) of the handle 1b may also be set appropriately. For example, the thickness of the handle 1b may be 5 mm or more and 30 mm or less.
　刀身１ａは、基体部３と、基体部３に繋がり基体部３に沿って位置する刃先部２とを有する。基体部３は、第１金属を含む。第１金属としては限定されず、例えば、鋼、合成鋼、ステンレスまたはチタン合金などが挙げられる。 The blade 1a has a base portion 3 and a cutting edge portion 2 connected to the base portion 3 and located along the base portion 3. The base portion 3 includes a first metal. The first metal is not limited, and examples thereof include steel, synthetic steel, stainless steel, and titanium alloy.
　合成鋼としては、例えば、クロム（Ｃｒ）、モリブデン（Ｍｏ）、バナジウム（Ｖ）、タングステン（Ｗ）、コバルト（Ｃｏ）および銅（Ｃｕ）からなる群より選択される少なくとも１種の金属を含む材料などが挙げられる。ステンレスとしては、例えば、クロム・ニッケル系またはクロム系などが挙げられる。チタン合金としては、例えば、いわゆる６４チタンといわれる、アルミ（Ａｌ）を６質量％、バナジウムを４質量％の割合で含むチタン合金などが挙げられる。第１金属がステンレスの場合、錆などに対する基体部３の耐食性を向上させることができる。 The synthetic steel includes, for example, at least one metal selected from the group consisting of chromium (Cr), molybdenum (Mo), vanadium (V), tungsten (W), cobalt (Co), and copper (Cu). Examples include materials. Examples of the stainless steel include chromium-nickel type or chromium type. Examples of the titanium alloy include a titanium alloy called 64 titanium, which contains 6% by mass of aluminum (Al) and 4% by mass of vanadium. When the first metal is stainless steel, the corrosion resistance of the base portion 3 against rust and the like can be improved.
　一実施形態に係る刃物１において、第１金属は基体部３の主成分である。主成分とは、基体部３を構成する全成分１００質量％のうち、７０質量％を超える成分のことを意味する。 In the cutlery 1 according to one embodiment, the first metal is the main component of the base portion 3. The main component means a component exceeding 70% by mass out of 100% by mass of all components constituting the base portion 3.
　図２に示すように、基体部３は、柄１ｂから露出した露出部３１と、柄１ｂの内部に挿入された中子３２とを含む。露出部３１は、長手方向（ｘ軸方向）に沿って背部３Ａおよび図４に示すように端部３Ｃが延在している。露出部３１の長手方向先端付近で、露出部３１の幅が狭くなっており、露出部３１の先端で端部３Ｃと背部３Ａとが繋がっている。端部３Ｃには、図４に示すように、端部３Ｃに沿って刃先部２が接続されている。 As shown in FIG. 2, the base portion 3 includes an exposed portion 31 exposed from the handle 1b and a core 32 inserted into the interior of the handle 1b. The exposed portion 31 has a back portion 3A extending along the longitudinal direction (x-axis direction) and an end portion 3C as shown in FIG. The width of the exposed portion 31 is narrowed near the longitudinal tip of the exposed portion 31, and the end portion 3C and the back portion 3A are connected at the tip of the exposed portion 31. As shown in FIG. 4, the cutting edge portion 2 is connected to the end portion 3C along the end portion 3C.
　基体部３の端部３Ｃは、例えば図４に示すように、基体部３の厚み方向（ｚ軸方向）に対して平行であってもよく、ｚ軸方向に対して傾斜していてもよい。あるいは、基体部３の端部３Ｃは、ｚ軸方向に対して湾曲していたり屈曲していたりしてもよい。端部３Ｃが湾曲または屈曲していると、基体部３と刃先部２との接合面積が大きくなる。そのため、基体部３と刃先部２との接合強度が高くなり、刃物１の耐久性が高くなる。 The end portion 3C of the base portion 3 may be parallel to the thickness direction (z-axis direction) of the base portion 3, or may be inclined with respect to the z-axis direction, as shown in FIG. 4, for example. . Alternatively, the end portion 3C of the base portion 3 may be curved or bent with respect to the z-axis direction. When the end portion 3C is curved or bent, the joint area between the base portion 3 and the cutting edge portion 2 becomes large. Therefore, the bonding strength between the base portion 3 and the cutting edge portion 2 is increased, and the durability of the blade 1 is increased.
　中子３２は、露出部３１よりも幅方向（ｙ軸方向）に狭くなっており、柄１ｂの内部に挿入されている。一実施形態に係る刃物１における中子３２は、少なくとも１つの孔部３２ａを有する。孔部３２ａに柄１ｂの一部が挿入されることによって、刀身１ａと柄１ｂとが強固に固定されている。 The core 32 is narrower in the width direction (y-axis direction) than the exposed portion 31, and is inserted inside the handle 1b. The core 32 in the cutter 1 according to one embodiment has at least one hole 32a. By inserting a portion of the handle 1b into the hole 32a, the blade 1a and the handle 1b are firmly fixed.
　刃先部２は、第２金属２ａと複数の硬質粒子４とを含む。第２金属２ａは、少なくともニッケル（Ｎｉ）とクロム（Ｃｒ）と鉄（Ｆｅ）とを含む金属である。第２金属２ａが、少なくともニッケルとクロムと鉄とを含む金属であれば、刃先部２は、耐食性が向上するとともに、クラックが入りにくくなる。少なくともニッケルとクロムと鉄とを含む金属としては、例えば、インコネル（登録商標）またはコルモノイ（登録商標）などの合金が挙げられる。 The cutting edge portion 2 includes a second metal 2a and a plurality of hard particles 4. The second metal 2a is a metal containing at least nickel (Ni), chromium (Cr), and iron (Fe). If the second metal 2a is a metal containing at least nickel, chromium, and iron, the cutting edge portion 2 will have improved corrosion resistance and will be less likely to crack. Examples of the metal containing at least nickel, chromium, and iron include alloys such as Inconel (registered trademark) and Colmonoy (registered trademark).
　一実施形態に係る刃物１において、刃先部２に含まれる第２金属２ａは、基体部３に含まれる第１金属よりも低い硬度（ビッカース硬度）を有する金属を含んでいてもよい。このような構成によって、刃物１は、第１金属と第２金属２ａとの双方の利点を持ち合わせることができる。すなわち、刃物１の全体的な強度を、基体部３の第１金属によって高くすることができる。さらに、刃先部２の第２金属２ａによって、刃物１の使用時に負荷される応力による刃先部２の割れまたは欠けの発生が低減し、刃先部２の耐久性を向上させることができる。 In the knife 1 according to one embodiment, the second metal 2a included in the cutting edge portion 2 may include a metal having a lower hardness (Vickers hardness) than the first metal included in the base portion 3. With such a configuration, the cutter 1 can have the advantages of both the first metal and the second metal 2a. That is, the overall strength of the cutter 1 can be increased by the first metal of the base portion 3. Furthermore, the second metal 2a of the cutting edge part 2 reduces the occurrence of cracking or chipping of the cutting edge part 2 due to stress applied when the cutting tool 1 is used, and the durability of the cutting edge part 2 can be improved.
　刃先部２に含まれる硬質粒子４は、刃先部２に含まれる第２金属２ａよりも高い硬度（ビッカース硬度）を有しており、炭化タングステン（ＷＣ）を含んでいる。このような構成によって、刃先部２全体の硬さを向上させることができ、刃先部２の耐摩耗性を向上させることができる。さらに、硬質粒子４は、第２金属２ａよりも高い硬度を有する材料によって形成されている。そのため、刃物１の使用時に硬質粒子４が対象物に接触することによって、対象物に対する刃先部２の切れ味が向上する。 The hard particles 4 contained in the cutting edge part 2 have a higher hardness (Vickers hardness) than the second metal 2a contained in the cutting edge part 2, and contain tungsten carbide (WC). With such a configuration, the hardness of the entire cutting edge portion 2 can be improved, and the wear resistance of the cutting edge portion 2 can be improved. Furthermore, the hard particles 4 are made of a material having higher hardness than the second metal 2a. Therefore, when the blade 1 is used, the hard particles 4 come into contact with the object, thereby improving the sharpness of the cutting edge portion 2 with respect to the object.
　硬質粒子４は、第２金属２ａよりも硬いだけなく、第１金属よりも硬い材料を含んでいてもよい。すなわち、硬質粒子４は、炭化タングステン以外に、第１金属よりも硬い材料を含んでいてもよい。このような材料としては、例えば、炭化チタン（ＴｉＣ）、窒化チタン（ＴｉＮ）、炭化タンタル（ＴａＣ）または炭化バナジウム（ＶＣ）などを含むサーメットなどが挙げられる。このように、十分な硬さを有する硬質粒子４を用いることによって、刃先部２の切れ味および耐摩耗性をより向上させることができる。硬質粒子４は、例えば、１０００Ｈｖ以上４０００Ｈｖ以下のビッカース硬度を有していてもよい。 The hard particles 4 may include a material that is not only harder than the second metal 2a but also harder than the first metal. That is, the hard particles 4 may contain a material harder than the first metal other than tungsten carbide. Examples of such materials include cermets containing titanium carbide (TiC), titanium nitride (TiN), tantalum carbide (TaC), vanadium carbide (VC), and the like. In this way, by using the hard particles 4 having sufficient hardness, the sharpness and wear resistance of the cutting edge portion 2 can be further improved. The hard particles 4 may have a Vickers hardness of, for example, 1000 Hv or more and 4000 Hv or less.
　刃先部２において、硬質粒子４は２体積％以上２５体積％以下の割合で含まれていてもよい。刃先部２の硬質粒子４が２体積％以上の割合で含まれていると、切れ味および耐摩耗性をさらに向上させることができる。刃先部２の硬質粒子４が２５体積％以下の割合で含まれていると、レーザークラッディングの生産性を高く維持できる。 In the cutting edge portion 2, the hard particles 4 may be contained in a proportion of 2% by volume or more and 25% by volume or less. If the hard particles 4 in the cutting edge portion 2 are contained in a proportion of 2% by volume or more, the sharpness and wear resistance can be further improved. When the hard particles 4 of the cutting edge portion 2 are contained in a proportion of 25% by volume or less, the productivity of laser cladding can be maintained at a high level.
　硬質粒子４の含有率は、刃先部２の断面（ｙｚ平面に平行な断面）を走査型電子顕微鏡を用いて観察し、観察画像の写真から、刃先部２全体の面積に対する硬質粒子４の合計の面積の割合を体積％として求めればよい。具体的には、硬質粒子４の含有率は、次のように算出する。まず、刃先部２の長さ方向（ｘ軸方向）に沿ってほぼ均等間隔で異なる５カ所の位置で刃先部２の断面観察を実施する。次に、これら５カ所で硬質粒子４の面積割合を測定する。この５箇所での硬質粒子４の面積の割合の平均値を求める。この面積の割合の平均値を硬質粒子４の含有率と見なすことで、硬質粒子４の含有率が算出される。 The content of hard particles 4 can be determined by observing the cross section of the cutting edge part 2 (a cross section parallel to the yz plane) using a scanning electron microscope, and from the photograph of the observed image, calculating the content of the hard particles 4 with respect to the entire area of the cutting edge part 2. It is sufficient to calculate the area ratio as volume %. Specifically, the content rate of hard particles 4 is calculated as follows. First, cross-sectional observation of the blade edge part 2 is performed at five different positions at approximately equal intervals along the length direction (x-axis direction) of the blade edge part 2. Next, the area ratio of the hard particles 4 is measured at these five locations. The average value of the area ratio of the hard particles 4 at these five locations is determined. By regarding the average value of this area ratio as the content rate of the hard particles 4, the content rate of the hard particles 4 is calculated.
　刃先部２において、硬質粒子４が存在しないマトリックス領域におけるタングステンの含有量は、１５質量％以下であってもよい。タングステンの含有量が１５質量％以下であれば、硬質粒子４が存在しないマトリックス領域は靭性が高く、刃先部２が欠けにくくなる。 In the cutting edge portion 2, the tungsten content in the matrix region where the hard particles 4 are not present may be 15% by mass or less. If the tungsten content is 15% by mass or less, the matrix region where no hard particles 4 are present has high toughness, and the cutting edge portion 2 is less likely to chip.
　硬質粒子４の形状は限定されず、種々の形状が採用され得る。硬質粒子４の形状としては、例えば、球体状、楕円体状または多面体形状などが挙げられる。これらの中でも、硬質粒子４は多面体形状を有していてもよい。多面体形状の中でも角ばった多面体形状であってもよい。硬質粒子４が角ばった多面体形状を有していると、硬質粒子４と第２金属２ａとの密着性を向上させることができる。硬質粒子４は、球体状、楕円体状または多面体形状など規則的な形状を有するものに限定されない。硬質粒子４は、例えば、一部が針状に尖っている形状または一部に窪み（図６に示すような凹部４ａ）を有する形状など、不規則な形状を有していてもよい。硬質粒子４は、単一の形状を有する粒子であってもよく、種々の形状を有する粒子の混合物であってもよい。 The shape of the hard particles 4 is not limited, and various shapes can be adopted. Examples of the shape of the hard particles 4 include a spherical shape, an ellipsoidal shape, and a polyhedral shape. Among these, the hard particles 4 may have a polyhedral shape. Among the polyhedral shapes, an angular polyhedral shape may be used. When the hard particles 4 have an angular polyhedral shape, the adhesion between the hard particles 4 and the second metal 2a can be improved. The hard particles 4 are not limited to those having a regular shape such as a spherical shape, an ellipsoid shape, or a polyhedral shape. The hard particles 4 may have an irregular shape, for example, a shape in which a part is sharp like a needle or a shape in which a part has a depression (a recess 4a as shown in FIG. 6). The hard particles 4 may be particles having a single shape or may be a mixture of particles having various shapes.
　刃先部２に含まれる硬質粒子４の少なくとも１つは、刃先部２から露出していてもよい。刃先部２は図４および図５に示すように、刃先２Ａと、刃先２Ａの両側に位置する一対の側面２ｃとを含んでいる。硬質粒子４の少なくとも１つは、例えば、刃先部２の側面２ｃから露出していてもよく、刃先２Ａから露出していてもよい。 At least one of the hard particles 4 included in the cutting edge portion 2 may be exposed from the cutting edge portion 2. As shown in FIGS. 4 and 5, the cutting edge portion 2 includes a cutting edge 2A and a pair of side surfaces 2c located on both sides of the cutting edge 2A. At least one of the hard particles 4 may be exposed from the side surface 2c of the cutting edge portion 2, or may be exposed from the cutting edge 2A, for example.
　硬質粒子４の少なくとも１つが刃先部２の側面２ｃから露出していると、刃物１を用いて対象物を切る際、対象物に硬質粒子４が接触する。その結果、刃先部２の切れ味が良好となり、刃先部２の耐摩耗性を向上させることができる。図４および５に示すように、一実施形態に係る刃物１では、刃先部２の双方の側面２ｃから、複数の硬質粒子４が露出している。このため、刃先部２の切れ味および耐摩耗性がより向上する。 If at least one of the hard particles 4 is exposed from the side surface 2c of the cutting edge portion 2, the hard particle 4 comes into contact with the object when cutting the object using the blade 1. As a result, the sharpness of the cutting edge portion 2 becomes good, and the wear resistance of the cutting edge portion 2 can be improved. As shown in FIGS. 4 and 5, in the cutter 1 according to one embodiment, a plurality of hard particles 4 are exposed from both side surfaces 2c of the cutting edge portion 2. As shown in FIGS. Therefore, the sharpness and wear resistance of the cutting edge portion 2 are further improved.
　一方、硬質粒子４の少なくとも１つが刃先部２の刃先２Ａから露出していると、刃物１を用いて対象物を切る際に、刃先２Ａから露出する硬質粒子４が対象物に接触する。その結果、刃先２Ａの切れ味を向上させることができる。 On the other hand, if at least one of the hard particles 4 is exposed from the cutting edge 2A of the cutting edge portion 2, the hard particles 4 exposed from the cutting edge 2A will come into contact with the object when cutting the object using the knife 1. As a result, the sharpness of the cutting edge 2A can be improved.
　図６に示すように、凹部４ａを有する硬質粒子４のうちの少なくとも１つにおいて、凹部４ａが刃先部２の表面から露出していてもよい。凹部４ａが刃先部２の表面から露出していることによって、刃先部２の切れ味がより向上する。さらに、接触面積の低減による刃物１の滑り性がより向上する。 As shown in FIG. 6, the recess 4a may be exposed from the surface of the cutting edge portion 2 in at least one of the hard particles 4 having the recess 4a. Since the concave portion 4a is exposed from the surface of the blade edge portion 2, the sharpness of the blade edge portion 2 is further improved. Furthermore, the slipperiness of the blade 1 is further improved due to the reduction in the contact area.
　刃先部２を研磨しても刃先部２の表面に硬質粒子４が露出しやすくするために、硬質粒子４は、刃先部２の内部で基体部３の長さ方向（ｘ軸方向）および幅方向（ｙ軸方向）のみならず、基体部３の厚み方向（ｚ軸方向）にも分散していてもよい。 In order to make it easier for the hard particles 4 to be exposed on the surface of the blade edge part 2 even if the blade edge part 2 is polished, the hard particles 4 are inserted into the length direction (x-axis direction) and the width of the base part 3 inside the blade edge part 2. They may be dispersed not only in the direction (y-axis direction) but also in the thickness direction (z-axis direction) of the base portion 3.
　硬質粒子４は、例えば、５μｍ以上５０μｍ以下の粒子径を有していてもよい。このような粒子径を有する硬質粒子４を得るためには、５μｍ未満の粒子径を有する粒子および５０μｍを超える粒子径を有する粒子を、例えばふるいを用いて選別すればよい。 The hard particles 4 may have a particle diameter of, for example, 5 μm or more and 50 μm or less. In order to obtain the hard particles 4 having such a particle size, particles having a particle size of less than 5 μm and particles having a particle size of more than 50 μm may be separated using, for example, a sieve.
　硬質粒子４、第１金属および第２金属２ａのビッカース硬度の測定は、ＪＩＳ　Ｚ　２２４４（ＩＳＯ６５０７－２、以下同じ）に準じた方法を用いて行えばよい。仮に、この方法による測定が困難である場合、硬質粒子４、前記第１金属および第２金属２ａの組成をそれぞれ同定し、同定した組成とほぼ同等の組成を有する試料を作成し、これら試料についてＪＩＳ　Ｚ　２２４４に準じた方法で測定すればよい。 The Vickers hardness of the hard particles 4, the first metal, and the second metal 2a may be measured using a method according to JIS Z 2244 (ISO 6507-2, hereinafter the same). If measurement by this method is difficult, identify the compositions of the hard particles 4, the first metal, and the second metal 2a, prepare samples having almost the same composition as the identified compositions, and measure these samples. It may be measured by a method according to JIS Z 2244.
　本開示に係る刃物おいて、第１金属、第２金属２ａおよび硬質粒子４のビッカース硬度は、大小関係を把握することができればよい。したがって、同定した組成と試料の組成とにズレが生じていても、大小関係に実質的に影響しない範囲で許容される。 In the cutlery according to the present disclosure, the Vickers hardness of the first metal, the second metal 2a, and the hard particles 4 may be determined as long as the magnitude relationship can be determined. Therefore, even if there is a discrepancy between the identified composition and the composition of the sample, it is allowed as long as it does not substantially affect the magnitude relationship.
　一実施形態に係る刃物１において、刃先部２は、硬質粒子４が存在しないマトリックス領域における鉄の含有量が１０質量％以上であり、かつ鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上である。刃物１は、このような構成を有することによって、優れた耐摩耗性を有し、刃先部２が破損しにくい。 In the cutter 1 according to one embodiment, the cutting edge portion 2 has an iron content of 10% by mass or more in the matrix region where no hard particles 4 are present, and a mass ratio of the iron content to the tungsten content ( Fe/W) is 1 or more. By having such a configuration, the cutter 1 has excellent wear resistance, and the cutting edge portion 2 is less likely to be damaged.
　硬質粒子４が存在しないマトリックス領域における鉄の含有量が１０質量％以上であれば、一実施形態に係る刃物１は、刃先部２が破損しにくくなる。硬質粒子４が存在しないマトリックス領域に１０質量％以上の鉄が含まれていると、ＦｅリッチなＦｅＮｉ合金が形成されると推察される。その結果、熱膨張率が低下して金属の熱ストレスが減少し、クラックの発生が低下すると推察される。硬質粒子４が存在しないマトリックス領域における鉄の含有量について上限は限定されず、例えば４０質量％以下であってもよい。 If the iron content in the matrix region where the hard particles 4 are not present is 10% by mass or more, the cutting edge portion 2 of the cutter 1 according to the embodiment becomes less likely to be damaged. It is presumed that if 10% by mass or more of iron is contained in the matrix region where the hard particles 4 are not present, an Fe-rich FeNi alloy is formed. As a result, it is presumed that the thermal expansion coefficient decreases, the thermal stress of the metal decreases, and the occurrence of cracks decreases. There is no upper limit to the iron content in the matrix region where hard particles 4 are not present, and may be, for example, 40% by mass or less.
　硬質粒子４が存在しないマトリックス領域において、タングステンの含有量が多くなるとマトリックス領域の硬度が上昇し、刃先部２の割れまたは欠けが発生しやすくなる。硬質粒子４が存在しないマトリックス領域において、鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上、すなわち、タングステンの含有量が鉄の含有量よりも少ない場合、鉄の含有量が多く、タングステンはマトリックス中へ溶解しにくくなる。その結果、マトリックス領域の硬度の上昇が低減され、刃先部２の靭性を向上させることができる。鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）は１以上であれば限定されず、例えば、上限は、２０程度であってもよい。 In the matrix region where hard particles 4 are not present, when the tungsten content increases, the hardness of the matrix region increases, making the cutting edge portion 2 more likely to crack or chip. In the matrix region where hard particles 4 are not present, if the mass ratio (Fe/W) between the iron content and the tungsten content is 1 or more, that is, the tungsten content is less than the iron content, the iron The higher the content, the more difficult it is for tungsten to dissolve into the matrix. As a result, the increase in hardness of the matrix region is reduced, and the toughness of the cutting edge portion 2 can be improved. The mass ratio (Fe/W) between the content of iron and the content of tungsten is not limited as long as it is 1 or more. For example, the upper limit may be about 20.
　次に、一実施形態に係る刃物１を製造する方法について説明する。一実施形態に係る刃物１が得られる方法であれば限定されない。刃物１の製造方法の一実施形態について、図７～１０に基づいて説明する。 Next, a method for manufacturing the cutlery 1 according to one embodiment will be described. The method is not limited as long as it allows the blade 1 according to one embodiment to be obtained. An embodiment of the method for manufacturing the cutlery 1 will be described based on FIGS. 7 to 10.
　図７～図１０は、図１に示す刃物１の製造方法の一実施形態を説明するための図である。刃物１の製造方法の一実施形態は、例えば、下記の工程（ａ）～（ｄ）を包含する。
　（ａ）第１金属を含む基体部３を準備する工程。
　（ｂ）第２金属２ａを構成する金属粉体と鉄含有金属と硬質粒子４とを準備する工程。
　（ｃ）基体部３の端部３Ｃに対して、第２金属２ａを構成する金属粉体と鉄含有金属と硬質粒子４とを噴射しつつ、金属粉体および鉄含有金属を焼き付ける工程。
　（ｄ）刃部材６と基体部３とを研磨する工程。 7 to 10 are diagrams for explaining one embodiment of a method for manufacturing the cutter 1 shown in FIG. 1. FIG. One embodiment of the method for manufacturing the cutlery 1 includes, for example, the following steps (a) to (d).
(a) Step of preparing the base portion 3 containing the first metal.
(b) A step of preparing metal powder, iron-containing metal, and hard particles 4 constituting the second metal 2a.
(c) A step of baking the metal powder and the iron-containing metal while spraying the metal powder, the iron-containing metal, and the hard particles 4 constituting the second metal 2a onto the end portion 3C of the base portion 3.
(d) A step of polishing the blade member 6 and the base portion 3.
　工程（ａ）では、第１金属を含む基体部３を準備する。基体部３は、図７に示すような形状を有する。基体部３は、例えば、ステンレスの板材をプレス加工して所定の刃物１の型を打ち抜いた後、焼き入れすることによって準備する。焼き入れでは、余熱、焼き入れ、および冷却を何回か繰り返して行ってもよい。焼き入れによって、基体部３の硬度を高めることができる。 In step (a), a base portion 3 containing a first metal is prepared. The base portion 3 has a shape as shown in FIG. The base portion 3 is prepared, for example, by pressing a stainless steel plate material, punching out a mold of a predetermined cutter 1, and then hardening the mold. In quenching, preheating, quenching, and cooling may be repeated several times. The hardness of the base portion 3 can be increased by hardening.
　余熱では、後に実施する焼き入れよりも低い温度で基体部３を加熱する。余熱によって、焼き入れの際に高温になると生じやすいひび割れなどの発生を低減することができる。焼き入れの条件は、材料によって適宜設定することができ、例えば、１０００℃以上の温度で基体部３を加熱する条件に設定すればよい。冷却では、焼き入れの温度から急激に基体部３を冷やす。冷却によって、焼き入れで活性した素材同士を固定することができる。 In the preheating, the base portion 3 is heated at a lower temperature than in the quenching that will be performed later. The residual heat can reduce the occurrence of cracks, etc. that tend to occur when high temperatures are reached during quenching. The hardening conditions can be set appropriately depending on the material, and for example, the conditions may be set to heat the base portion 3 at a temperature of 1000° C. or higher. In cooling, the base portion 3 is rapidly cooled from the hardening temperature. By cooling, the materials activated by quenching can be fixed together.
　次いで、工程（ｂ）では、第２金属２ａを構成する金属粉体と鉄含有金属と硬質粒子４とを準備する。第２金属２ａおよび硬質粒子４については上述の通りであり、詳細な説明は省略する。鉄含有金属としては、例えば、鉄、ステンレスまたは鉄を主成分とする合金などが挙げられる。ステンレスとしては、例えば、ＳＵＳ４１０ＬまたはＳＵＳ３１６などが挙げられる。 Next, in step (b), metal powder, iron-containing metal, and hard particles 4 that constitute the second metal 2a are prepared. The second metal 2a and the hard particles 4 are as described above, and detailed description thereof will be omitted. Examples of iron-containing metals include iron, stainless steel, and alloys containing iron as a main component. Examples of stainless steel include SUS410L and SUS316.
　次いで、工程（ｃ）では、基体部３の端部３Ｃに対して、第２金属２ａを構成する金属粉体と鉄含有金属の金属粉体と硬質粒子４とを噴射しつつ、金属粉体および鉄含有金属の金属粉体を焼き付ける。その結果、硬質粒子４が存在しないマトリックス領域における鉄の含有量が１０質量％以上であり、かつ鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上となる刃部材６が形成される。 Next, in step (c), the metal powder constituting the second metal 2a, the metal powder of the iron-containing metal, and the hard particles 4 are injected onto the end portion 3C of the base portion 3, while the metal powder is and baking metal powder of ferrous metals. As a result, the blade member has an iron content of 10% by mass or more in the matrix region where no hard particles 4 are present, and a mass ratio of iron content to tungsten content (Fe/W) of 1 or more. 6 is formed.
　第２金属２ａを構成する金属粉体および鉄（Ｆｅ）含有金属の金属粉体を焼き付ける方法としては、例えば、レーザーによって溶解させて焼き付ける方法などが挙げられる。このような方法としては、例えば、レーザーを用いたクラッディング技術が挙げられる。 Examples of the method of baking the metal powder and the iron (Fe)-containing metal powder constituting the second metal 2a include a method of melting and baking with a laser. Such a method includes, for example, a cladding technique using a laser.
　具体的には、図８に示すように、レーザー光７ａの横側から基体部３の端部３Ｃ付近に対し、第２金属２ａを構成する金属粉体および鉄（Ｆｅ）含有金属の金属粉体を含むクラッディング材料６ａを、ノズル７から供給する。これにより、刃先部２を構成する材料であるクラッディング材料６ａを溶解させつつ、端部３Ｃに金属結合させることができる。クラッディング材料６ａのさらに外側から不活性ガス７ｂを端部３Ｃに対して吹き付ける。これにより、クラッディング材料６ａがレーザー光７ａに当たりやすくなる。不活性ガス７ｂとしては、例えば、アルゴンガスなどが挙げられる。不活性ガス７ｂは、図９に示すように、レーザー光７ａと同じ経路から吐出することができる。これにより、不活性ガス７ｂは、クラッディング材料６ａの内側から端部３Ｃに対して吹き付けることができる。 Specifically, as shown in FIG. 8, metal powder constituting the second metal 2a and metal powder of an iron (Fe)-containing metal are applied from the side of the laser beam 7a to the vicinity of the end 3C of the base portion 3. The cladding material 6a containing bodies is supplied from the nozzle 7. Thereby, the cladding material 6a, which is the material constituting the cutting edge portion 2, can be melted and metallurgically bonded to the end portion 3C. Inert gas 7b is blown toward end portion 3C from further outside of cladding material 6a. This makes it easier for the cladding material 6a to be exposed to the laser beam 7a. Examples of the inert gas 7b include argon gas. The inert gas 7b can be discharged from the same path as the laser beam 7a, as shown in FIG. Thereby, the inert gas 7b can be blown against the end portion 3C from inside the cladding material 6a.
　クラッディング材料６ａを溶解させる際に、硬質粒子４を混ぜる。レーザー光７ａによって硬質粒子４以外のクラッディング材料６ａが溶解して、端部３Ｃに付着する。一方、硬質粒子４は融点が高いため、レーザー光７ａによって溶解されにくい。しかし、硬質粒子４の炭化タングステン（ＷＣ）の一部が分解し、タングステン（Ｗ）が刃部材６の加工中にマトリックス中に溶解する。クラッディング材料６ａを溶解させる際に硬質粒子４を混ぜると、刃先部２に複数の硬質粒子４を分散させることができる。 Hard particles 4 are mixed when dissolving the cladding material 6a. The cladding material 6a other than the hard particles 4 is melted by the laser beam 7a and adheres to the end portion 3C. On the other hand, since the hard particles 4 have a high melting point, they are difficult to melt by the laser beam 7a. However, a portion of the tungsten carbide (WC) of the hard particles 4 decomposes, and the tungsten (W) dissolves into the matrix during processing of the blade member 6. If hard particles 4 are mixed in when melting the cladding material 6a, a plurality of hard particles 4 can be dispersed in the cutting edge portion 2.
　刃先部２において、硬質粒子４が存在しないマトリックス領域における鉄の含有量を１０質量％以上にするためには、第２金属２ａを構成する金属粉体に含まれる鉄の含有量を考慮して、鉄含有金属に由来する鉄の添加量を、適宜調整すればよい。例えば、鉄含有金属に由来する鉄の添加量が５質量％以上となるように調整すればよく、多くても３０質量％程度に調整すればよい。 In order to make the iron content in the matrix region where the hard particles 4 are not present in the cutting edge portion 2 to be 10% by mass or more, the iron content contained in the metal powder constituting the second metal 2a must be taken into consideration. , the amount of iron derived from the iron-containing metal may be adjusted as appropriate. For example, the amount of iron derived from iron-containing metals may be adjusted to 5% by mass or more, and may be adjusted to about 30% by mass at most.
　第２金属２ａに含まれる微量のタングステンまたは硬質粒子４に由来するタングステン、上述の鉄の含有量を考慮して、硬質粒子４が存在しないマトリックス領域における鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）を１以上とすればよい。 Considering the trace amount of tungsten contained in the second metal 2a, the tungsten derived from the hard particles 4, and the above-mentioned iron content, the iron content in the matrix region where the hard particles 4 are not present and the tungsten content are The mass ratio (Fe/W) may be set to 1 or more.
　次いで、工程（ｄ）では、刃部材６と基体部３とを研磨する。研磨は、例えば、酸化アルミニウム（Ａｌ２Ｏ３）、炭化珪素（ＳｉＣ）、ダイヤモンドまたはこれらの混合粒子などが表面に塗布された研磨石を用いて行われる。研磨は、複数回に分けて行ってもよい。例えば、図１０に示すように、まず点線Ｌ１に沿って１回目の研磨を行い、次に、点線Ｌ２に沿って第２研磨を行ってもよい。 Next, in step (d), the blade member 6 and the base portion 3 are polished. Polishing is performed using, for example, a polishing stone whose surface is coated with particles of aluminum oxide (Al 2 O 3 ), silicon carbide (SiC), diamond, or a mixture thereof. Polishing may be performed in multiple steps. For example, as shown in FIG. 10, first polishing may be performed along dotted line L1, and then second polishing may be performed along dotted line L2.
　このような方法によって、優れた耐摩耗性を有し、刃先部２が破損しにくい刃物１が得られる。 By such a method, a cutter 1 having excellent wear resistance and whose cutting edge portion 2 is less likely to be damaged can be obtained.
　ステンレス鋼を用いて、図７に示すような基体部３を製造した。次いで、得られた基体部３の端部３Ｃに対して、第２金属２ａを構成する金属粉体と鉄（Ｆｅ）含有金属の金属粉体と硬質粒子４とを噴射しつつ、金属粉体を端部３Ｃに焼き付けた。金属粉体としては、インコネル６００と鉄（Ｆｅ）含有金属との混合物を使用した。鉄（Ｆｅ）含有金属としては、ＳＵＳ４１０Ｌを使用した。硬質粒子４としては炭化タングステン（ＷＣ）で形成された粒子を使用した。金属粉体が８５質量％および硬質粒子４（炭化タングステン）が１５質量％となるように調整した。鉄（Ｆｅ）含有金属は、鉄の添加量が表１に記載の添加量（５質量％、１０質量％、１５質量％、２０質量％、２５質量％および３０質量％）となるように使用した。 A base portion 3 as shown in FIG. 7 was manufactured using stainless steel. Next, the metal powder constituting the second metal 2a, the metal powder of iron (Fe)-containing metal, and the hard particles 4 are injected onto the end portion 3C of the obtained base portion 3, while the metal powder is was burned onto the end 3C. As the metal powder, a mixture of Inconel 600 and a metal containing iron (Fe) was used. SUS410L was used as the iron (Fe)-containing metal. As the hard particles 4, particles made of tungsten carbide (WC) were used. Adjustments were made so that the metal powder content was 85% by mass and the hard particles 4 (tungsten carbide) were 15% by mass. Iron (Fe)-containing metals are used so that the amount of iron added is as shown in Table 1 (5% by mass, 10% by mass, 15% by mass, 20% by mass, 25% by mass and 30% by mass). did.
　端部３Ｃへの金属粉体の焼き付けは、図８に示すような装置を用いて行った。具体的には、レーザー光７ａの横側から基体部３の端部３Ｃ付近に対し、インコネル６００と鉄含有金属との混合物（クラッディング材料６ａ）を、ノズル７から供給した。次いで、クラッディング材料６ａを溶解させる際に、硬質粒子４を混ぜた。レーザー光７ａによって硬質粒子４以外のクラッディング材料６ａが溶解して、端部３Ｃに付着した。一方、硬質粒子４は融点が高い。そのため、レーザー光７ａによって溶解されにくいものの、硬質粒子４の炭化タングステンの一部が分解して、タングステンがマトリックス中に溶解した。ノズル７からクラッディング材料６ａを供給する際に、クラッディング材料６ａのさらに外側から不活性ガス７ｂ（アルゴン）を端部３Ｃに対して吹き付けた。 Baking of the metal powder onto the end portion 3C was performed using an apparatus as shown in FIG. Specifically, a mixture of Inconel 600 and an iron-containing metal (cladding material 6a) was supplied from the nozzle 7 to the vicinity of the end portion 3C of the base portion 3 from the side of the laser beam 7a. Then, when the cladding material 6a was dissolved, the hard particles 4 were mixed. The cladding material 6a other than the hard particles 4 was melted by the laser beam 7a and adhered to the end portion 3C. On the other hand, the hard particles 4 have a high melting point. Therefore, a part of the tungsten carbide of the hard particles 4 was decomposed and the tungsten was dissolved into the matrix, although it was difficult to dissolve by the laser beam 7a. When the cladding material 6a was supplied from the nozzle 7, an inert gas 7b (argon) was blown onto the end portion 3C from further outside the cladding material 6a.
　このようにして、刃先部を構成する材料であるクラッディング材料６ａを溶解させつつ、基体部３の端部３Ｃに金属結合させることができた。さらに、刃先部に複数の硬質粒子４を分散させることができた。得られた刃物（試料Ｎｏ．１～６）の刃先部を構成している成分の割合を、表１に示す。 In this way, the cladding material 6a, which is the material forming the cutting edge, was melted and was able to be metallically bonded to the end portion 3C of the base portion 3. Furthermore, a plurality of hard particles 4 could be dispersed at the cutting edge. Table 1 shows the proportions of the components constituting the cutting edge of the obtained cutlery (sample Nos. 1 to 6).
　得られた刃物（試料Ｎｏ．１～６）について、刃先部の強度を検証した。具体的には、落下試験で、一定の高さから鉄球を刃先部に自由落下させて刃先部の強度を検証した。刃先部に割れまたは欠けなどの破損が発生しているか否かを、目視で確認した。刃先部に割れまたは欠けなどの破損が発生していなかった場合には「無し」、発生していた場合には「有り」と評価した。結果を表１に示す。 The strength of the cutting edge portion of the obtained cutlery (sample Nos. 1 to 6) was verified. Specifically, in a drop test, an iron ball was dropped freely onto the cutting edge from a certain height to verify the strength of the cutting edge. It was visually confirmed whether there was any damage such as cracks or chips on the cutting edge. If damage such as cracking or chipping did not occur at the cutting edge, it was evaluated as "absent," and if it did, it was evaluated as "present." The results are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１に示すように、本開示に係る刃物（試料Ｎｏ．１～６）は、刃先部に割れまたは欠けなどの破損が発生していないことがわかる。このように、硬質粒子が存在しないマトリックス領域において、鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上であり、鉄の含有量が１０質量％以上である刃物（試料Ｎｏ．１～６）は、刃先部に割れまたは欠けなどの破損が発生していないことがわかる。 As shown in Table 1, it can be seen that the blades according to the present disclosure (sample Nos. 1 to 6) have no damage such as cracks or chips at the cutting edge. In this way, in the matrix region where there are no hard particles, the mass ratio (Fe/W) between the iron content and the tungsten content is 1 or more, and the iron content is 10% by mass or more ( It can be seen that samples Nos. 1 to 6) have no damage such as cracks or chips at the cutting edge.
　次に、鉄含有金属に含まれる鉄の添加量および硬質粒子４の添加量を、表２に示す添加量に変更した以外は、試料Ｎｏ．１～６の刃物と同様の手順で、刃物（試料Ｎｏ．７～２５）を得た。得られた刃物（試料Ｎｏ．７～２５）について、刃先部の強度を上記の手順と同様の手順で検証した。結果を表２に示す。 Next, sample No. 1 was prepared, except that the amount of iron contained in the iron-containing metal and the amount of hard particles 4 added were changed to the amounts shown in Table 2. Cutlery (sample Nos. 7 to 25) were obtained using the same procedure as for cutlery Nos. 1 to 6. The strength of the cutting edge portion of the obtained cutlery (sample Nos. 7 to 25) was verified in the same manner as above. The results are shown in Table 2.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２に示すように、本開示に係る刃物（試料Ｎｏ．７～１９）は、刃先部に割れまたは欠けなどの破損が発生していないことがわかる。一方、硬質粒子が存在しないマトリックス領域において、鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以下である、または鉄の含有量が１０質量％未満である刃物（試料Ｎｏ．２０～２５）は、刃先部に割れまたは欠けなどの破損が発生していることがわかる。 As shown in Table 2, it can be seen that the blades according to the present disclosure (Samples Nos. 7 to 19) had no damage such as cracks or chips at the cutting edge. On the other hand, in the matrix region where no hard particles exist, the mass ratio of iron content to tungsten content (Fe/W) is 1 or less, or the iron content is less than 10% by mass (sample). Nos. 20 to 25) are found to have damage such as cracks or chips at the cutting edge.
　硬質粒子４が存在しないマトリックス領域において、Ｆｅの含有量が１０質量％以上となるように鉄含有金属に由来する鉄を添加する場合に、硬質粒子４のＷＣの添加量は、１０質量％以上３５質量％以下にすることができる。刃先部２は、ＷＣの添加量を１０質量％以上３５質量％以下にすると、ＷＣの粒子の含有量が増加して、耐摩耗性が向上する。刃先部２は切れ味が悪くなった場合でも砥ぎやすい。これにより、刃物１は長期間使用することができる。刃先部２は、ＷＣの添加量が１０質量％よりも小さくなると、ＷＣの粒子の含有量が低くなり、耐摩耗性が低下しやすくなる。 When adding iron derived from an iron-containing metal so that the Fe content is 10% by mass or more in the matrix region where the hard particles 4 are not present, the amount of WC added in the hard particles 4 is 10% by mass or more. It can be made 35% by mass or less. When the amount of WC added to the cutting edge portion 2 is set to 10% by mass or more and 35% by mass or less, the content of WC particles increases and wear resistance improves. The blade edge portion 2 is easy to sharpen even if it becomes dull. Thereby, the cutter 1 can be used for a long period of time. In the cutting edge portion 2, when the amount of WC added is less than 10% by mass, the content of WC particles becomes low, and the wear resistance tends to decrease.
　刃先部２において、硬質粒子４のＷＣの含有量は体積％で算出することができる。インコネル６００の密度を８．４２（ｇ／ｃｍ３）、ＳＵＳ４１０Ｌの密度を７．７４（ｇ／ｃｍ３）、ＷＣの密度を１５．６（ｇ／ｃｍ３）とする。硬質粒子４のＷＣの添加量が少ない、例えば、金属粉体（インコネル６００＋ＳＵＳ４１０Ｌ）：硬質粒子（ＷＣ）＝９５質量％（インコネル６００：９０質量％＋ＳＵＳ４１０Ｌ：５質量％）：５質量％の場合、体積比は、金属粉体：硬質粒子（ＷＣ）＝１１．３４（９０／８．４２＋５／７．７４）:０．３２(５／１５．６)となり、体積％は、０．３２／（１１．３４＋０．３２）＝０．３２／１１．６４＝２．７％となる。ここで、マトリックのＷの含有量は、表２より、２．３８質量％（試料Ｎｏ．７）であり、Ｗの溶解量をＸとすると、Ｘ／（９５＋Ｘ）＝０．０２３８からＸ＝２．３２となり、２．３２／１５．６＝０．１５体積％が溶解すると推察される。したがって、刃先部２は、ＷＣの硬質粒子４が２．５５体積％の割合で含まれることになる。 In the cutting edge portion 2, the content of WC in the hard particles 4 can be calculated in volume %. The density of Inconel 600 is 8.42 (g/cm 3 ), the density of SUS410L is 7.74 (g/cm 3 ), and the density of WC is 15.6 (g/cm 3 ). When the amount of WC added in the hard particles 4 is small, for example, metal powder (Inconel 600 + SUS410L): hard particles (WC) = 95% by mass (Inconel 600: 90% by mass + SUS410L: 5% by mass): 5% by mass, The volume ratio is metal powder: hard particle (WC) = 11.34 (90/8.42 + 5/7.74): 0.32 (5/15.6), and the volume % is 0.32/( 11.34+0.32)=0.32/11.64=2.7%. Here, the content of W in the matrix is 2.38% by mass (sample No. 7) from Table 2, and if the dissolved amount of W is X, then X/(95+X)=0.0238, so X= 2.32, and it is estimated that 2.32/15.6=0.15% by volume is dissolved. Therefore, the cutting edge portion 2 contains the WC hard particles 4 at a ratio of 2.55% by volume.
　硬質粒子４のＷＣの添加量が多い、例えば、金属粉体（インコネル６００＋ＳＵＳ４１０Ｌ）：硬質粒子（ＷＣ）＝６０質量％（インコネル６００：３０質量％＋ＳＵＳ４１０Ｌ：３０質量％）：４０質量％の場合、体積比は、金属粉体：硬質粒子（ＷＣ）＝７．４４（３０／８．４２＋３０／７．７４）:２．５６（４０/１５．６）となり、体積％は、２．５６／（７．４４＋２．５６）＝２．５６／１０＝２５．６％となる。マトリックのＷの含有量は、表２より、１９質量％（試料Ｎｏ．１９）であり、Ｗの溶解量をＸとすると、Ｘ／（６０＋Ｘ）＝０．１９からＸ＝１４．１となり、１４．１／１５．６＝０．９体積％が溶解すると推察される。したがって、刃先部２は、ＷＣの硬質粒子が２４．７体積％の割合で含まれることなる。 When the amount of WC added in hard particles 4 is large, for example, metal powder (Inconel 600 + SUS410L): hard particles (WC) = 60% by mass (Inconel 600: 30% by mass + SUS410L: 30% by mass): 40% by mass, The volume ratio is metal powder: hard particle (WC) = 7.44 (30/8.42 + 30/7.74): 2.56 (40/15.6), and the volume % is 2.56/( 7.44+2.56)=2.56/10=25.6%. From Table 2, the W content of the matrix is 19% by mass (sample No. 19), and if the dissolved amount of W is X, then X/(60+X) = 0.19, so X = 14.1. It is estimated that 14.1/15.6=0.9% by volume is dissolved. Therefore, the cutting edge portion 2 contains 24.7% by volume of WC hard particles.
　以上、本開示の実施形態について説明した。しかし、本開示に係る実施形態は上述の実施形態に限定されるものではなく、下記の（１）に示す本開示の範囲内で種々の変更および改良が可能である。 The embodiments of the present disclosure have been described above. However, the embodiments according to the present disclosure are not limited to the above-described embodiments, and various changes and improvements can be made within the scope of the present disclosure shown in (1) below.
　（１）本開示に係る刃物は、基体部と、基体部に繋がり基体部に沿って位置する刃先部とを有する刀身を備える。基体部は、第１金属を含み、刃先部は、第２金属と、第２金属よりも高い硬度を有する複数の硬質粒子とを含む。硬質粒子は、炭化タングステンを含む。第２金属が、少なくともニッケルとクロムと鉄とを含む。刃先部は、硬質粒子が存在しないマトリックス領域における鉄の含有量が１０質量％以上であり、かつ鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上である。 (1) A cutlery according to the present disclosure includes a blade having a base portion and a cutting edge portion connected to the base portion and located along the base portion. The base portion includes a first metal, and the cutting edge portion includes a second metal and a plurality of hard particles having a higher hardness than the second metal. The hard particles include tungsten carbide. The second metal includes at least nickel, chromium, and iron. In the cutting edge portion, the iron content in the matrix region where no hard particles are present is 10% by mass or more, and the mass ratio of the iron content to the tungsten content (Fe/W) is 1 or more.
　本開示の実施形態に関し、以下の（２）～（９）に示す実施形態をさらに開示する。 Regarding the embodiments of the present disclosure, embodiments shown in (2) to (9) below are further disclosed.
　（２）上記（１）に記載の刃物において、第２金属は、第１金属よりも低い硬度を有する金属を含む。
　（３）上記（１）または（２）に記載の刃物において、硬質粒子は、角ばった多面体形状を有する硬質粒子を含む。
　（４）上記（１）～（３）のいずれかに記載の刃物において、硬質粒子は、第１金属よりも高い硬度を有する材料を含む。
　（５）上記（１）～（４）のいずれかに記載の刃物において、刃先部は、硬質粒子を２体積％以上２５体積％以下の割合で含む。
　（６）上記（１）～（５）のいずれかに記載の刃物において、刃先部は、硬質粒子が存在しないマトリックス領域におけるタングステンの含有量が、１５質量％以下である。
　（７）上記（１）～（６）のいずれかに記載の刃物において、刃先部は、刃先と、刃先の両側に位置する一対の側面とを有し、硬質粒子のうちの少なくとも１つが、側面から露出している。
　（８）上記（１）～（７）のいずれかに記載の刃物において、硬質粒子のうちの少なくとも１つが、刃先から露出している。
　（９）上記（１）～（８）のいずれかに記載の刃物において、硬質粒子のうちの少なくとも１つが凹部を有し、凹部を有する硬質粒子のうちの少なくとも１つにおいて、凹部が刃先部の表面から露出している。 (2) In the cutlery described in (1) above, the second metal includes a metal having a lower hardness than the first metal.
(3) In the cutlery described in (1) or (2) above, the hard particles include hard particles having an angular polyhedral shape.
(4) In the cutlery according to any one of (1) to (3) above, the hard particles include a material having a higher hardness than the first metal.
(5) In the cutlery according to any one of (1) to (4) above, the cutting edge portion contains hard particles in a proportion of 2% by volume or more and 25% by volume or less.
(6) In the cutter according to any one of (1) to (5) above, the tungsten content in the matrix region in which no hard particles are present in the cutting edge portion is 15% by mass or less.
(7) In the cutler according to any one of (1) to (6) above, the cutting edge portion has a cutting edge and a pair of side surfaces located on both sides of the cutting edge, and at least one of the hard particles is exposed from the side.
(8) In the cutter according to any one of (1) to (7) above, at least one of the hard particles is exposed from the cutting edge.
(9) In the cutter according to any one of (1) to (8) above, at least one of the hard particles has a recess, and in at least one of the hard particles having the recess, the recess is located at the cutting edge. exposed from the surface.
　１　　刃物
　１ａ　刀身
　１ｂ　柄
　２　　刃先部
　２ａ　第２金属
　２Ａ　刃先
　２ｃ　側面
　３　　基体部
　３１　露出部
　３２　中子
　３２ａ　孔部
　３Ａ　背部
　３Ｃ　端部
　４　　硬質粒子
　４ａ　凹部
　６　　刃部材
　６ａ　クラッディング材料
　７　ノズル
　７ａ　レーザー光
　７ｂ　不活性ガス 1 Knife 1a Blade 1b Handle 2 Cutting edge 2a Second metal 2A Cutting edge 2c Side 3 Base 31 Exposed part 32 Core 32a Hole 3A Back 3C End 4 Hard particle 4a Recess 6 Blade member 6a Cladding material 7 Nozzle 7a Laser Light 7b Inert gas

Claims (9)

  1. 　基体部と、
    　該基体部に繋がり前記基体部に沿って位置する刃先部と、
    を有する刀身を備え、
    　前記基体部は、第１金属を含み、
    　前記刃先部は、第２金属と、該第２金属よりも高い硬度を有する複数の硬質粒子とを含み、
    　前記硬質粒子が、炭化タングステンを含み、
    　前記第２金属が、少なくともニッケルとクロムと鉄とを含み、
    　前記刃先部は、前記硬質粒子が存在しないマトリックス領域における鉄の含有量が１０質量％以上であり、かつ鉄の含有量とタングステンの含有量との質量比（Ｆｅ／Ｗ）が１以上である、
    刃物     a base portion;
    a cutting edge portion connected to the base portion and located along the base portion;
    Equipped with a blade that has
    The base portion includes a first metal,
    The cutting edge portion includes a second metal and a plurality of hard particles having a higher hardness than the second metal,
    the hard particles include tungsten carbide,
    The second metal includes at least nickel, chromium, and iron,
    In the cutting edge portion, the iron content in the matrix region where the hard particles are not present is 10% by mass or more, and the mass ratio of the iron content to the tungsten content (Fe/W) is 1 or more. ,
    cutlery
  2. 　前記第２金属は、前記第１金属よりも低い硬度を有する金属を含む、請求項１に記載の刃物。 The cutlery according to claim 1, wherein the second metal includes a metal having a lower hardness than the first metal.
  3. 　前記硬質粒子は、角ばった多面体形状を有する硬質粒子を含む、請求項１または２に記載の刃物。 The cutlery according to claim 1 or 2, wherein the hard particles include hard particles having an angular polyhedral shape.
  4. 　前記硬質粒子は、前記第１金属よりも高い硬度を有する材料を含む、請求項１～３のいずれかに記載の刃物。 The cutlery according to any one of claims 1 to 3, wherein the hard particles include a material having a higher hardness than the first metal.
  5. 　前記刃先部は、前記硬質粒子を２体積％以上２５体積％以下の割合で含む、請求項１～４のいずれかに記載の刃物。 The cutter according to any one of claims 1 to 4, wherein the cutting edge portion contains the hard particles in a proportion of 2% by volume or more and 25% by volume or less.
  6. 　前記刃先部は、前記硬質粒子が存在しないマトリックス領域におけるタングステンの含有量が、１５質量％以下である、請求項１～５のいずれかに記載の刃物。 The cutter according to any one of claims 1 to 5, wherein the cutting edge portion has a tungsten content of 15% by mass or less in a matrix region where the hard particles are not present.
  7. 　前記刃先部は、刃先と、該刃先の両側に位置する一対の側面とを有し、前記硬質粒子のうちの少なくとも１つが、前記側面から露出している、請求項１～６のいずれかに記載の刃物。 The cutting edge portion has a cutting edge and a pair of side surfaces located on both sides of the cutting edge, and at least one of the hard particles is exposed from the side surfaces. The knife mentioned.
  8. 　前記硬質粒子のうちの少なくとも１つが、前記刃先から露出している、請求項１～７のいずれかに記載の刃物。 The cutter according to any one of claims 1 to 7, wherein at least one of the hard particles is exposed from the cutting edge.
  9. 　前記硬質粒子のうちの少なくとも１つが凹部を有し、該凹部を有する硬質粒子のうちの少なくとも１つにおいて、前記凹部が刃先部の表面から露出している、請求項１～８のいずれかに記載の刃物。 Any one of claims 1 to 8, wherein at least one of the hard particles has a recess, and in at least one of the hard particles having the recess, the recess is exposed from the surface of a cutting edge. The knife mentioned.
PCT/JP2023/026687 2022-07-21 2023-07-20 Knife WO2024019129A1 (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060090603A1 (en) * 2004-09-24 2006-05-04 Kai U.S.A., Ltd., Dba Kershaw Knives Knife blade manufacturing process
JP2013154599A (en) * 2012-01-31 2013-08-15 Toyo Kohan Co Ltd Mold part, material for mold part, and method for manufacturing these items
JP2016041853A (en) * 2015-11-04 2016-03-31 住友電工ハードメタル株式会社 Cemented carbide, micro-drill and method for producing cemented carbide
JP2018008074A (en) * 2015-06-22 2018-01-18 京セラ株式会社 Cutter
WO2021081143A1 (en) * 2019-10-22 2021-04-29 Milwaukee Electric Tool Corporation Cladded tool and method of making a cladded tool
JP2022100186A (en) * 2020-12-23 2022-07-05 日本特殊陶業株式会社 Cutter

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060090603A1 (en) * 2004-09-24 2006-05-04 Kai U.S.A., Ltd., Dba Kershaw Knives Knife blade manufacturing process
JP2013154599A (en) * 2012-01-31 2013-08-15 Toyo Kohan Co Ltd Mold part, material for mold part, and method for manufacturing these items
JP2018008074A (en) * 2015-06-22 2018-01-18 京セラ株式会社 Cutter
JP2016041853A (en) * 2015-11-04 2016-03-31 住友電工ハードメタル株式会社 Cemented carbide, micro-drill and method for producing cemented carbide
WO2021081143A1 (en) * 2019-10-22 2021-04-29 Milwaukee Electric Tool Corporation Cladded tool and method of making a cladded tool
JP2022100186A (en) * 2020-12-23 2022-07-05 日本特殊陶業株式会社 Cutter

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