Cutting blade, granulating device, and method for manufacturing cutting blade

Abstract

A cutting blade (1) according to an embodiment includes: a cutting edge portion (20) designed to slide along a plate surface (204) of a mold plate (201) to cut a material (206) extruded onto the plate surface (204) from a hole (205) formed on the plate surface (204); and a base metal part (10) joined to the joining surface (25) of the cutting blade part (20), in which the base metal part (10) includes, in the vicinity of the joining surface (15), a cutting blade component detection part (10A) in which a cutting blade component is detected, the cutting blade component being a constituent component of a cutting blade material included in the cutting blade part (20). The base metal part (10) includes, inside the base metal part (10), a cutting edge component detection limit or less part (10B) in which the concentration of the cutting edge component is equal to or lower than the detection limit thereof. The cutting edge component detection section (10A) includes a portion in which the concentration of the cutting edge component gradually decreases as the cutting edge component detection section (10A) approaches the cutting edge component detection limit or less section (10B).

Description

Technical Field

[0001] The present disclosure relates to a cutting blade, a granulating device, and a method for manufacturing a cutting blade. Background Art

[0002] Patent Document 1 discloses a cutting blade that is used to cut a resin material extruded from a hole formed in a die plate.

[0003] Citation List

[0004] Patent Document

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication JP 2022-096887.

[0006] For example, a method of joining a cutting edge portion to a base metal portion (alloy portion, i.e., base material portion) by brazing requires a step of finishing the cutting edge portion. In addition, during the finishing step, the cutting edge portion or the base metal portion may be damaged, resulting in a reduction in the yield rate. Therefore, in the method of joining the cutting edge portion to the base metal portion by brazing, it is difficult to reduce the manufacturing cost. Summary of the Invention

[0007] According to the description in this specification and the drawings, other problems and novel features will become apparent.

[0008] The cutting blade according to an embodiment includes: a cutting edge portion designed to slide along the plate surface of a die plate so as to cut a material extruded onto the plate surface from a hole formed in the plate surface; and a base metal portion joined to the joint surface of the cutting edge portion, wherein the base metal portion includes a cutting edge component detection portion near the joint surface, in which a cutting edge component is detected, the cutting edge component being a constituent component of the cutting edge material contained in the cutting edge portion, the base metal portion includes a portion below the cutting edge component detection limit inside thereof, the portion below the cutting edge component detection limit being a portion where the concentration of the cutting edge component is equal to or lower than its detection limit, and the cutting edge component detection portion includes a portion in which the concentration of the cutting edge component decreases as it approaches the portion below the cutting edge component detection limit.

[0009] The granulating device according to an embodiment includes the above-mentioned cutting blade, a cutting blade support portion to which the cutting blade is connected, and the above-mentioned die plate.

[0010] The manufacturing method of a cutting blade according to an embodiment includes the following steps: forming a film on at least a predetermined joint surface of a cutting edge portion by plating or thermal spraying, the cutting edge portion being designed to slide along a plate surface of a die plate so as to cut a material extruded onto the plate surface from a hole formed in the plate surface; disposing the cutting edge portion in a cavity of a die; filling the cavity with a molten material such that the molten material contacts the joint surface of the cutting edge portion, the molten material being obtained by a base metal portion contained in a molten matrix metal material; and curing the molten material and thereby joining the base metal portion to the joint surface of the cutting edge portion, wherein the step of joining the base metal portion to the joint surface is performed such that: the base metal portion includes a cutting edge component detection portion near the joint surface, in which a cutting edge component is detected, the cutting edge component being a constituent component of a cutting edge material contained in the cutting edge portion; the base metal portion includes a portion below the cutting edge component detection limit inside thereof, the portion below the cutting edge component detection limit being a portion where the concentration of the cutting edge component is equal to or lower than its detection limit; and the cutting edge component detection portion includes a portion in which the concentration of the cutting edge component decreases as approaching the portion below the cutting edge component detection limit.

[0011] Advantages of the present invention

[0012] According to the above embodiment, a cutting blade, a granulating device, and a manufacturing method of a cutting blade can be provided, which can reduce the manufacturing cost. Description of the drawings

[0013] Figure 1 is a configuration diagram showing an example of a granulating device using a cutting blade according to a first embodiment;

[0014] Figure 2 is a perspective view showing an example of a die plate in a granulating device using a cutting blade according to a first embodiment;

[0015] Figure 3 is a perspective view showing an example of a cutting blade according to a first embodiment;

[0016] Figure 4 is a cross-sectional view showing an example of a joint portion including a joint surface of a base metal portion and a cutting edge portion according to a first embodiment, and shows a cross-section along Figure 3 the line IV shown in;

[0017] Figure 5 is a diagram schematically showing an example of the concentration of a cutting edge component in a joint portion including a joint surface of a base metal portion and a cutting edge portion according to a first embodiment, wherein the horizontal axis represents the distance from the joint surface in the base metal portion, and the vertical axis represents the concentration of the cutting edge component;

[0018] Figure 6 is a cross-sectional view showing an example of a joint portion including a joint surface of a base metal portion and a cutting edge portion according to the first embodiment, and shows a cross-section along the Figure 3 line IV shown in

[0019] Figure 7 is a diagram schematically showing an example of the concentration of a cutting edge component in a joint portion including a joint surface of a base metal portion and a cutting edge portion according to the first embodiment, where the horizontal axis represents the distance from the joint surface in the base metal portion, and the vertical axis represents the concentration of the cutting edge component;

[0020] Figure 8 is a cross-sectional view showing an example of a joint portion including a joint surface of a base metal portion and a cutting edge portion according to the first embodiment, and shows a cross-section along the Figure 3 line IV shown in

[0021] Figure 9 is a diagram schematically showing an example of the concentration of nickel in a joint portion including a joint surface of a base metal portion and a cutting edge portion according to the first embodiment, where the horizontal axis represents the distance from the joint surface in the base metal portion, and the vertical axis represents the concentration of nickel;

[0022] Figure 10 is a cross-sectional view showing an example of a joint portion including a joint surface of a base metal portion and a cutting edge portion according to a modified example of the first embodiment, and shows a cross-section along the Figure 3 line IV shown in

[0023] Figure 11 is a diagram schematically showing an example of the concentration of a film-forming component in a joint portion including a joint surface of a base metal portion and a cutting edge portion according to a modified example of the first embodiment, where the horizontal axis represents the distance from the joint surface in the base metal portion, and the vertical axis represents the concentration of the film-forming component;

[0024] Figure 12 is a flowchart showing an example of a method for manufacturing a cutting blade according to the first embodiment;

[0025] Figure 13 is a cross-sectional view showing an example of a cutting edge portion and a film formed on a joint surface of the cutting edge portion in a method for manufacturing a cutting blade according to the first embodiment;

[0026] Figure 14 is a cross-sectional view showing an example of a cutting edge portion disposed in a cavity of a mold in a method for manufacturing a cutting blade according to the first embodiment;

[0027] Figure 15is a cross-sectional view showing an example of molten material filled into a cavity of a mold in a method for manufacturing a cutting blade according to a first embodiment; and

[0028] Figure 16 is a flowchart showing an example of a method for manufacturing a cutting blade according to a second embodiment. DETAILED DESCRIPTION

[0029] For clarity, the following description and drawings are partially and appropriately omitted and simplified. Further, in all the drawings, the same elements are provided with the same reference numerals (or symbols), and redundant descriptions thereof are appropriately omitted.

[0030] (First Embodiment)

[0031] A cutting blade and a method for manufacturing the cutting blade according to the first embodiment will be described. First, a granulating device will be described as an example of a device using the cutting blade. Next, the cutting blade and the method for manufacturing the cutting blade will be described.

[0032] <Water Granulating Device>

[0033] Figure 1 is a configuration diagram showing an example of a granulating device using a cutting blade according to the first embodiment. Figure 2 is a perspective view showing an example of a mold plate in a granulating device using a cutting blade according to the first embodiment. In Figure 1 a partial exploded view of a part of the granulating device is shown in a frame.

[0034] As Figure 1 and Figure 2 shown, the granulating device is, for example, a water granulating device 200. The water granulating device 200 is connected to the downstream side of an extrusion device 100. The extrusion device 100 includes a drive unit 101, a speed reducer 102, a cylinder 103, and a screw 104. The rotation of the drive unit 101, which is, for example, a motor, is adjusted by the speed reducer 102 and transmitted to the screw 104. Accordingly, the screw 104 rotates in the cylinder 103 with the adjusted driving power of the drive unit 101.

[0035] The material 206 introduced into the cylinder 103 from a predetermined position on the cylinder 103 is extruded into the water granulating device 200 by the rotating screw 104. The introduced material 206 is, for example, a resin material. The extrusion device 100 plasticizes and kneads the resin material, for example, by heating and rotating the screw 104 in the cylinder 103, and extrudes the plasticized and kneaded resin material into the water granulating device 200.

[0036] The underwater granulation device 200 includes a die plate 201, a cutting blade support portion 202, a drive portion 203, and a cutting blade 1. The die plate 201, the cutting blade support portion 202, and the cutting blade 1 are arranged underwater. The die plate 201 has a plate surface 204. A plurality of holes 205 are formed in the plate surface 204. The material 206 extruded by the rotating screw 104 is extruded onto the plate surface 204 through the holes 205 formed in the plate surface 204. The material 206 extruded onto the plate surface 204 is, for example, a molten resin. In Figure 2 order not to complicate the drawings, reference numerals are added only to some of the holes 205 and some of the material 206 strips.

[0037] Each of the die plate 201 and the plate surface 204 has a central axis C. The cutting blade support portion 202 is arranged opposite to the die plate 201. The cutting blade support portion 202 rotates about the central axis C by the driving power of the drive portion 203. The cutting blade support portion 202 holds a plurality of cutting blades 1. In Figure 1 order not to complicate the drawings, reference numerals are added only to some of the cutting blades 1.

[0038] For example, the cutting blades 1 are held at equal intervals along the circumference of the circular cutting blade support portion 202. Further, as the cutting blade support portion 202 rotates, each cutting blade 1 rotates on the plate surface 204. Each cutting blade 1 slides along the plate surface 204, thereby cutting the material 206 extruded onto the plate surface 204 from the holes 205. For example, the molten resin extruded onto the plate surface 204 from the holes 205 is cut by the cutting blade 1. The cut molten resin solidifies underwater and becomes resin pellets.

[0039] <Cutting Blade>

[0040] An explanation of the cutting blade 1 will be given below. Figure 3 is a perspective view showing an example of the cutting blade 1 according to the first embodiment. As Figure 3 shown, the cutting blade 1 includes a base metal portion 10 and a cutting edge portion 20. The joint surface 15 of the base metal portion 10 is joined to the joint surface 25 of the cutting edge portion 20.

[0041] Note that, in order to explain the cutting blade 1, an XYZ orthogonal coordinate system is introduced. When the cutting blade 1 is arranged on the plate surface 204, the direction perpendicular to the plate surface 204 is defined as the Z-axis direction. The direction in which the cutting edge portion extends is defined as the Y-axis direction. The direction perpendicular to the Y-axis direction and the Z-axis direction is defined as the X-axis direction.

[0042] <Base Metal Portion>

[0043] The base metal part 10 includes a mounting part 11 and a top part 12. The mounting part 11 and the top part 12 are arranged adjacent to each other and are connected to each other in the Y-axis direction. The base metal part 10 contains, for example, stainless steel as its material. Thus, the base metal part 10 contains stainless steel as the base metal material, which contains iron, nickel, chromium, etc. Note that the base metal material is not limited to stainless steel containing iron, nickel, chromium, etc., and may also be stainless steel containing other metals or may be a material other than stainless steel. In some cases, the base metal material may be a material containing a resin material, etc.

[0044] The mounting part 11 is connected to the cutting blade support part 202, which transmits power to cause the cutting blade to slide along the plate surface 204. The mounting part 11 is formed, for example, on a part on the +Y-axis direction side of the base metal part 10. The mounting part 11 has, for example, a quadrangular prism shape and has a bottom surface 11a, an upper surface 11b, a front surface 11c, and a back surface 11d. The bottom surface 11a is a surface on the -Z-axis direction side, and the upper surface 11b is a surface on the +Z-axis direction side. The front surface 11c is a surface on the -X-axis direction side, and the back surface 11d is a surface on the +X-axis direction side.

[0045] A hole 13 is formed in the mounting part 11 for connecting it to the cutting blade support part 202. Only one hole 13 may be formed, or multiple holes 13 may be formed. The hole 13 penetrates, that is, extends from the upper surface 11b to the bottom surface 11a. For example, the cutting blade 1 is fixed to the cutting blade support part 202 by inserting a bolt into the hole 13 of the mounting part 11 and a hole formed in the cutting blade support part 202. Alternatively, in addition to the hole 13, a mechanism for connecting the cutting blade to the cutting blade support part 202, such as one or more grooves, may be formed in the mounting part 11.

[0046] The top 12 faces the plate surface 204, with the cutting edge portion 20 therebetween. The cutting edge portion 20 is joined to the top 12. The top 12 is formed, for example, on the portion of the base metal portion 10 on the -Y-axis direction side. The top 12 extends, for example, in the Y-axis direction. The top 12 has a bottom surface 12a, an upper surface 12b, a front surface 12c, and a back surface 12d. The bottom surface 12a is the surface on the -Z-axis direction side, and the upper surface 12b is the surface on the +Z-axis direction side. The front surface 12c is the surface on the -X-axis direction side, and the back surface 12d is the surface on the +X-axis direction side. For example, the front surface 12c has an inclined surface 14. The joining surface 25 of the cutting edge portion 20 is joined to the inclined surface 14 of the front surface 12c. Thus, the inclined surface 14 of the top 12 of the base metal portion 10 serves as the joining surface 15. Note that the portion joined to the cutting edge portion 20 and the like is not limited to the front surface 12c of the top 12 of the base metal portion 10, and the cutting edge portion 20 can be joined to a portion other than the front surface 12c. The base metal portion 10 can be directly joined to the cutting edge portion 20. Specifically, the base metal portion 10 can be directly joined to the cutting edge portion 20 without a film made of a film-forming material, such as a nickel film, therebetween. Note that in some cases, the base metal portion 10 can be joined to the cutting edge portion 20 with a film made of a film-forming material, such as a nickel film, therebetween.

[0047] <Cutting edge portion>

[0048] The cutting edge portion 20 is the portion that slides on the plate surface 204. The cutting edge portion 20 slides along the plate surface 204 of the die plate 201 to cut the material 206 extruded onto the plate surface 204 from the hole 205 formed on the plate surface 204. The cutting edge portion 20 contains, for example, titanium carbide (TiC) as the cutting edge material. For example, the cutting edge portion 20 contains a sintered material obtained by sintering titanium carbide. Note that the cutting edge material of the cutting edge portion 20 is not limited to a material containing titanium carbide, but can be a material containing other metals, such as tungsten carbide (WC). The cutting edge material contains a cutting edge component as its constituent component. For example, when the cutting edge material contains titanium carbide, the cutting edge component contains titanium (Ti).

[0049] The cutting edge portion 20 has, for example, a plate shape, where the cutting edge extends in the Y-axis direction. The cutting edge portion 20 has a bottom surface 20a and an upper surface 20b. The bottom surface 12a is the surface on the -Z-axis direction side, and the upper surface 12b is the surface on the +Z-axis direction side. The bottom surface 20a of the cutting edge portion 20 has a joining surface 25, which is joined to the joining surface 15 of the base metal portion 10. The shape of the cutting edge portion 20 is not limited to a plate shape, but can be a prism shape as long as it has a joining surface 25 that joins to the base metal portion 10. In addition, the cutting edge portion 20 can have a joining surface 25 on a portion other than the bottom surface 20a.

[0050] Figure 4 is a cross-sectional view showing an example of a joint portion including joint surfaces 15 and 25 of a base metal portion 10 and a cutting edge portion 20, respectively, according to the first embodiment, and shows a cross-section along the line IV shown in Figure 3 . As shown in Figure 4 , the joint surface 15 of the base metal portion 10 is joined to the joint surface 25 of the cutting edge portion 20. The base metal portion 10 includes a cutting edge component detection portion 10A near the joint surface 15. The cutting edge component detection portion 10A is a portion that detects a cutting edge component, which is a constituent component of the cutting edge material contained in the cutting edge portion 20. When the cutting edge portion 20 contains titanium carbide as the cutting edge material, the cutting edge component contains titanium. In addition, the base metal portion 10 includes a portion 10B below the detection limit of the cutting edge component inside thereof. The portion 10B below the detection limit of the cutting edge component is a portion where the concentration of the cutting edge component is equal to or lower than its detection limit. The state where the concentration of the cutting edge component is equal to or lower than its detection limit means the state where the concentration of the cutting edge component is equal to or lower than the detection limit of a concentration detector, such as a mass spectrometer.

[0051] Figure 5 is a diagram schematically showing an example of the concentration of a cutting edge component in a joint portion including joint surfaces 15 and 25 of a base metal portion 10 and a cutting edge portion 20, respectively, according to the first embodiment, where the horizontal axis represents the distance from the joint surface 15 of the base metal portion 10, and the vertical axis represents the concentration of the cutting edge component. As shown in Figure 5 , the cutting edge component detection portion 10A includes a portion in which the concentration of the cutting edge component gradually decreases as it approaches the portion 10B below the detection limit of the cutting edge component (i.e., the concentration of the cutting edge component decreases as the distance to the portion 10B below the detection limit of the cutting edge component decreases).

[0052] In Figure 5In this case, the concentration of the cutting edge component in the cutting edge component detection unit 10A monotonically decreases. However, the feature that "the cutting edge component detection unit 10A includes a portion in which the concentration of the cutting edge component gradually decreases as it approaches the portion below the cutting edge component detection limit 10B" is not limited to the monotonic decrease in the concentration of the cutting edge component in the cutting edge component detection unit 10A. For example, the feature that "the cutting edge component detection unit 10A includes a portion in which the concentration of the cutting edge component gradually decreases as it approaches the portion below the cutting edge component detection limit 10B" may mean that the concentration of the cutting edge component in the cutting edge component detection unit 10A first increases and forms a peak, and then gradually decreases as it approaches the portion below the cutting edge component detection limit 10B. In addition, in the cutting edge component detection unit 10A, the cutting edge component may exhibit a constant concentration and then sharply decrease as it approaches the portion below the cutting edge component detection limit 10B. In the following description in the specification, the portion including the concentration decrease refers to a feature similar to the above feature.

[0053] Figure 6 is a cross-sectional view showing an example of a joint portion including joint surfaces 15 and 25 of a base metal portion 10 and a cutting edge portion 20, respectively, according to the first embodiment, and shows a cross-section along Figure 3 the line IV shown in. As Figure 6 shown, the base metal portion 10 includes a first film-forming component detection unit 10C near the joint surface 15. The first film-forming component detection unit 10C is a portion in which the concentration of the detected film-forming component is higher than the concentration of the film-forming component contained in the base metal material.

[0054] Note that the base metal portion 10 may contain a material including a film-forming component as the base metal material, and the film-forming component is a constituent component of a film-forming material that can form a film on the cutting edge portion 20 by plating or thermal spraying. Specifically, the film-forming material that can form a film on the cutting edge portion 20 by plating or thermal spraying is, for example, nickel. The film-forming component is nickel. Therefore, the base metal portion 10 may include a nickel-containing stainless steel as the base metal material. In this case, the base metal portion 10 includes a portion (first nickel detection unit, see Figure 8 and Figure 9 ) near the joint surface 15, in which the detected nickel concentration is higher than the nickel concentration originally contained in the base metal material. Note that the film-forming material is not limited to nickel, as long as it is a material that can form a film on the cutting edge portion 20 by plating or thermal spraying, and may be, for example, chromium contained in the base metal material such as stainless steel, or a metal not contained in the base metal material such as stainless steel.

[0055] The base metal part 10 includes a second film-forming component detection part 10D inside the base metal part 10. The second film-forming component detection part 10D is a part where the concentration of the film-forming component is equal to or lower than the concentration of the film-forming component contained in the base metal material. Specifically, for example, when the base metal part 10 includes a nickel-containing stainless steel as the base metal material, the base metal part 10 includes, inside thereof, a part where the concentration of nickel is equal to or lower than the concentration of nickel originally contained in the base metal material (second nickel detection part, see Figure 8 and Figure 9 ).

[0056] Figure 7 is a diagram schematically showing an example of the concentration of the film-forming component in the joint part including the joint surfaces 15 and 25 of the base metal part 10 and the cutting edge part 20 respectively according to the first embodiment, where the horizontal axis represents the distance from the joint surface 15 of the base metal part 10, and the vertical axis represents the concentration of the film-forming component. As Figure 7 shown, the first film-forming component detection part 10C includes a part where the concentration of the film-forming component gradually decreases as it approaches the second film-forming component detection part 10D (that is, as the distance to the second film-forming component detection part 10D decreases, the concentration of the film-forming component decreases).

[0057] A case where the base metal part 10 includes a nickel-containing stainless steel as the base metal material will be described as an example. Figure 8 is a cross-sectional view showing an example of the joint part including the joint surfaces 15 and 25 of the base metal part 10 and the cutting edge part 20 respectively according to the first embodiment, and shows the cross-section along the line IV shown in Figure 3 . Figure 9 is a diagram schematically showing an example of the concentration of nickel in the joint part including the joint surfaces 15 and 25 of the base metal part 10 and the cutting edge part 20 respectively according to the first embodiment, where the horizontal axis represents the distance from the joint surface 15 of the base metal part 10, and the vertical axis represents the concentration of nickel.

[0058] As Figure 8 and Figure 9As shown in [the figure], the base metal part 10 includes a first nickel detection part 10E near the joint surface 15, where the detected nickel concentration is higher than the nickel concentration originally contained in the base metal material. The first nickel detection part 10E corresponds to the above-mentioned first film-forming component detection part 10C, and the first film-forming component is limited to nickel. The base metal part 10 includes a second nickel detection part 10F inside it, where the nickel concentration is equal to or lower than the nickel concentration contained in the base metal material. The second nickel detection part 10F corresponds to the above-mentioned second film-forming component detection part 10D, and the second film-forming component is limited to nickel. The first nickel detection part 10E includes a part where the nickel concentration gradually decreases as it approaches the second nickel detection part (that is, as the distance to the second nickel detection part decreases, the nickel concentration decreases).

[0059] (Variant example)

[0060] As a variant example, a case where the base metal material originally does not contain a film-forming material that can form a film on the cutting edge part 20 by plating or thermal spraying will be described. Figure 10 is a cross-sectional view showing an example of a joint part including joint surfaces 15 and 25 of a base metal part 10 and a cutting edge part 20 according to a variant example of the first embodiment, and shows a cross-section along the Figure 3 line IV shown in [the figure]. Figure 11 is a diagram schematically showing an example of the concentration of a film-forming component in a joint part including joint surfaces 15 and 25 of a base metal part 10 and a cutting edge part 20 according to a variant example of the first embodiment, where the horizontal axis represents the distance from the joint surface 15 of the base metal part 10, and the vertical axis represents the concentration of the film-forming component.

[0061] As Figure 10 and Figure 11 shown in the variant example shown in [the figure], when the base metal material does not contain a film-forming material, the base metal part 10 includes a film-forming component detection part 10G near the joint surface 15, in which a film-forming component is detected, and the film-forming component is a constituent component of a film-forming material that can form a film on the cutting edge part 20 by plating or thermal spraying. The base metal part 10 includes a part below the detection limit of the film-forming component 10H inside it, where the concentration of the film-forming component is equal to or lower than its detection limit. The film-forming component detection part 10G includes a part where the concentration of the film-forming component gradually decreases as it approaches the part below the detection limit of the film-forming component 10H (that is, as the distance to the part below the detection limit of the film-forming component 10H decreases, the concentration of the film-forming component decreases).

[0062] <Manufacturing method of cutting blade>

[0063] Next, the manufacturing method of the cutting blade according to the present embodiment will be described. Figure 12 is a flowchart showing an example of the manufacturing method 1 of the cutting blade according to the first embodiment.Figure 13 It is a cross-sectional view showing an example of a cutting edge portion 20 and a film 30 formed on a joint surface 25 of the cutting edge portion 20 in a manufacturing method of a cutting blade 1 according to the first embodiment.

[0064] Figure 14 It is a cross-sectional view showing an example of the cutting edge portion 20 disposed in a chamber 32 of a mold 31 in a manufacturing method of a cutting blade 1 according to the first embodiment. Figure 15 It is a cross-sectional view showing an example of a molten material 33 filled into the chamber 32 of the mold 31 in a manufacturing method of a cutting blade 1 according to the first embodiment.

[0065] As Figure 12 and Figure 13 shown in step S11 in

[0066] Next, as Figure 12 and Figure 14 shown in step S12 in

[0067] Next, as Figure 12 and Figure 15 shown in step S13 in

[0068] Next, as Figure 12As shown in step S14, the molten material 33 is solidified, and the base metal part 10 is thus joined to the joining surface 25 of the cutting edge part 20. Further, the base metal part 10 includes a cutting edge component detection part 10A near the joining surface 15, and a cutting edge component, which is a constituent component of the cutting edge material contained in the cutting edge part 20, is detected in the cutting edge component detection part. Further, the base metal part 10 includes a below-cutting-edge-component-detection-limit part 10B inside thereof, in which the concentration of the cutting edge component is equal to or lower than its detection limit. Further, the cutting edge component detection part 10A includes a part in which the concentration of the cutting edge component gradually decreases as it approaches the below-cutting-edge-component-detection-limit part 10B (that is, the concentration of the cutting edge component decreases as the distance to the below-cutting-edge-component-detection-limit part 10B decreases).

[0069] When the molten material 33 is solidified and the base metal part 10 is thus joined to the joining surface 25 of the cutting edge part 20, the base metal part 10 may include a first film-forming component detection part 10C near the joining surface 15, and the concentration of the film-forming component detected in the first film-forming component detection part is higher than the concentration of the film-forming component contained in the base metal material. The base metal part 10 may include a second film-forming component detection part 10D in which the concentration of the film-forming component is equal to or lower than the concentration of the film-forming component contained in the base metal material. At this time, the first film-forming component detection part 10C may include a part in which the concentration of the film-forming component gradually decreases as it approaches the second film-forming component detection part 10D (that is, the concentration of the film-forming component decreases as the distance to the second film-forming component detection part 10D decreases).

[0070] For example, when the molten material 33 is solidified and the base metal part 10 is thus joined to the joining surface 25 of the cutting edge part 20, the base metal part 10 may include a first nickel detection part 10E near the joining surface 15, and the concentration of nickel detected in the first nickel detection part is higher than the concentration of nickel contained in the base metal material. Further, the base metal part 10 may include a second nickel detection part 10F inside thereof, in which the concentration of nickel is equal to or lower than the concentration of nickel contained in the base metal material. Further, the first nickel detection part 10E may include a part in which the concentration of nickel gradually decreases as it approaches the second nickel detection part 10F (that is, the concentration of nickel decreases as the distance to the second nickel detection part 10F decreases). The step of solidifying the molten material 33 and thus joining the base metal part 10 to the joining surface 25 of the cutting edge part 20 may be performed in the atmosphere.

[0071] Note that in the case where the film-forming material is a material not included in the base metal material as in the above-described modification example, when the molten material 33 solidifies and the base metal part 10 thus joins to the joining surface 25 of the cutting edge part 20, the base metal part 10 includes a film-forming component detection part 10G near the joining surface 15, and a film-forming component that is a constituent component of the film-forming material is detected in this film-forming component detection part. Further, the base metal part 10 includes a part below the film-forming component detection limit 10H inside thereof, where the concentration of the film-forming component is equal to or lower than its detection limit. Further, the film-forming component detection part 10G includes a part where the concentration of the film-forming component gradually decreases as it approaches the part below the film-forming component detection limit 10H (that is, as the distance to the part below the film-forming component detection limit 10H decreases, the concentration of the film-forming component decreases).

[0072] (Comparative Example)

[0073] Next, before explaining the effects of the present embodiment, the comparative example will be explained first. In the method for manufacturing a cutting blade according to the comparative example, a film 30 made of a film-forming material is not formed on the joining surface 25, and the molten material 33 of the base metal part 10 directly contacts the joining surface 25 of the cutting edge part 20 and thus solidifies. Specifically, in the method for manufacturing a cutting blade according to the comparative example, for example, molten stainless steel is used and the molten stainless steel is directly contacted with the cutting edge part 20 containing titanium carbide.

[0074] In the method for manufacturing a cutting blade according to the comparative example, when the molten material 33 directly contacts the joining surface 25 of the cutting edge part 20, it is difficult for them to join to each other due to the oxide film formed on the joining surface 25. For example, in the atmosphere, the process of filling the molten material 33 into the chamber 32 and the process of solidifying the molten material 33 and thus joining the base metal part 10 to the joining surface 25 of the cutting edge part 20 are performed. This is because the atmosphere in these processes cannot be controlled due to the manufacturing apparatus and joining needs to be performed in the atmosphere. Therefore, in the atmosphere, an oxide film is formed on the joining surface 25 that is in a high-temperature state due to the molten material 33.

[0075] (Effects of the Present Embodiment)

[0076] Next, the effects of the present embodiment will be described. In the present embodiment, a film 30 is formed on the joint surface 25 of the cutting edge portion 20 by plating or hot spraying with a film-forming material, and then the molten material 33 is brought into contact with the joint surface 25. Therefore, even when the steps of filling the molten material 33 into the chamber 32 and curing the molten material 33 and thus joining the joint surface 25 of the base metal portion 10 and the cutting edge portion 20 are performed in the atmosphere, the formation of an oxide film can be prevented by the film 30 formed on the joint surface 25. Therefore, the base metal portion 10 and the cutting edge portion 20 can be fusion-joined or diffusion-joined. In this way, the bond between the base metal portion 10 and the cutting edge portion 20 can be strengthened.

[0077] In addition, the cutting blade 1 according to the present embodiment includes a cutting edge component detection portion 10A near the joint surface 15 of the base metal portion 10, and a cutting edge component is detected in the cutting edge component detection portion. For example, when analyzing the cross section of the base metal portion 10, titanium is also detected in the region of the molten and solidified stainless steel of the base metal portion 10. Therefore, it is determined that the base metal portion 10 and the cutting edge portion 20 are fusion-joined or diffusion-joined. Therefore, the bond between the base metal portion 10 and the cutting edge portion 20 can be strengthened. Therefore, the yield of the cutting blade 1 can be improved, and the manufacturing cost can be reduced.

[0078] In addition, the base metal portion 10 includes a first film-forming component detection portion 10C near the joint surface 15 of the base metal portion 10, and a film-forming component is detected in the first film-forming component detection portion. Specifically, the base metal portion 10 includes a first nickel detection portion 10E near the joint surface 15. Therefore, the bond between the base metal portion 10 and the cutting edge portion 20 can be strengthened.

[0079] In addition, brazing can be omitted in the manufacturing method 1 of the cutting blade according to the present embodiment. Therefore, the time and cost required for brazing can be reduced. In addition, the finishing process can also be eliminated, thereby preventing damage to the cutting edge portion 20 or the base metal portion 10 due to the finishing process.

[0080] (Second Embodiment)

[0081] Next, the second embodiment will be described. In the manufacturing method 1 of the cutting blade according to the present embodiment, the thickness of the film 30 at which the film 30 disappears when the molten material solidifies is obtained. Figure 16 It is a flowchart showing an example of the manufacturing method 1 of the cutting blade according to the second embodiment.

[0082] As Figure 16As shown in step S10 in [description], in the manufacturing method 1 of the cutting blade according to this embodiment, before step S11 of forming a film 30 on the joint surface 25 of the cutting edge portion 20 by plating or thermal spraying with a film-forming material, there is a step S10 of obtaining the thickness of the film, in which case the base metal portion 10 and the cutting edge portion 20 are directly joined. Specifically, the thickness of the film 30 is obtained, at which thickness, when the molten material 33 contacts the film 30 made of the film-forming material and formed on the joint surface 25 of the cutting edge portion 20 and the molten material 33 is thus solidified, the film 30 disappears and the base metal portion 10 and the cutting edge portion 20 are directly joined. For example, the thickness of the nickel film formed on the joint surface 25 is obtained, at which thickness, when the molten material 33 contacts the nickel film and the molten material 33 is thus solidified, the nickel film disappears and the base metal portion 10 is thus directly joined to the cutting edge portion 20.

[0083] The thickness of the film 30 made of the film-forming material can be changed according to the base metal material and the cutting edge material, or can be changed according to the shapes of the base metal portion 10 and the cutting edge portion 20, at which thickness, when the molten material 33 contacts the film 30 and the molten material 33 is thus solidified, the film 30 disappears and the base metal portion 10 is thus directly joined to the cutting edge portion 20. The thickness of the disappearing film 30 can be, for example, several hundred μm or less, or several tens of μm or less, and in some cases, can be several μm or less. For example, the thickness of the disappearing film 30 can be 1 μm to 10 μm, 10 μm to 100 μm, or 100 μm to 900 μm. In addition, the thickness of the disappearing film 30 can be 1 nm to 10 nm, 10 nm to 100 nm, or 100 nm to 900 nm.

[0084] By forming the film 30 with the above-obtained thickness on the joint surface 25, in step S14, the base metal portion 10 can be directly joined to the cutting edge portion 20, where the molten material 33 is solidified and the base metal portion 10 is thus joined to the joint surface 25. Figure 16 Steps S11 to S14 in [description] are respectively similar to Figure 12 Steps S11 to S14 in [description].

[0085] According to this embodiment, when the molten material 33 is solidified and the base metal portion 10 is thus joined to the joint surface 25, the film 30 made of the film-forming material can disappear. Therefore, the base metal portion 10 and the cutting edge portion 20 can be fusion-joined or diffusion-joined, and the bond between the base metal portion 10 and the cutting edge portion 20 can be strengthened. The remaining structures and effects are included in the descriptions of the first embodiment and the modification examples.

[0086] Although the present disclosure has been specifically described based on the embodiments above, it is needless to say that the present disclosure is not limited to the first embodiment, the second embodiment, and the modified examples, and various modifications can be made without departing from the scope and spirit of the present disclosure. In addition, combinations obtained by combining two or more of the configurations of the first embodiment, the second embodiment, and the modified examples are also included within the scope of the technical principles of the present disclosure.

[0087] This application is based on and claims the priority of Japanese Patent Application JP 2022-183230 filed on November 16, 2022, the entire disclosure of which is incorporated herein by reference.

[0088] List of Reference Numerals

[0089] 1 Cutting blade

[0090] 10 Base metal part

[0091] 10A Cutting edge component detection part

[0092] 10B Below the detection limit of the cutting edge component

[0093] 10C First film-forming component detection part

[0094] 10D Second film-forming component detection part

[0095] 10E First nickel detection part

[0096] 10F Second nickel detection part

[0097] 10G Film-forming component detection part

[0098] 10H Film-forming component detection part

[0099] 11 Mounting part

[0100] 11a Bottom surface

[0101] 11b Upper surface

[0102] 11c Front surface

[0103] 11d Back surface

[0104] 12 Top

[0105] 12a Bottom surface

[0106] 12b Upper surface

[0107] 12c Front surface

[0108] 12d Back surface

[0109] 13 Hole

[0110] 14 Inclined surface

[0111] 15 Joining surface

[0112] 20 Cutting edge

[0113] 20a Bottom surface

[0114] 20b Upper surface

[0115] 25 Joining surface

[0116] 30 Membrane

[0117] 31 Mold

[0118] 32 Chamber

[0119] 33 Molten material

[0120] 100 Extrusion device

[0121] 101 Driving part

[0122] 102 Reducer

[0123] 103 Barrel

[0124] 104 Screw

[0125] 200 underwater pelletizing device

[0126] 201 Mold plate

[0127] 202 Cutting blade support part

[0128] 203 Driving part

[0129] 204 Plate surface

[0130] 205 Hole

[0131] 206 Material

Claims

1. Cutting blade, comprising: A cutting edge portion designed to slide along the plate surface of a die plate to cut the material extruded onto the plate surface from a hole formed in the plate surface; And A base metal portion joined to the joint surface of the cutting edge portion, wherein The base metal portion includes a cutting edge component detection portion near the joint surface, in which a cutting edge component is detected, and the cutting edge component is a constituent component of the cutting edge material contained in the cutting edge portion; The base metal portion includes a portion below the cutting edge component detection limit inside it, and the portion below the cutting edge component detection limit is a portion where the concentration of the cutting edge component is equal to or lower than its detection limit, and The cutting edge component detection portion includes a portion where the concentration of the cutting edge component gradually decreases as it approaches the portion below the cutting edge component detection limit.

2. The cutting blade according to claim 1, wherein The base metal portion contains a material containing a film-forming component as the base metal material, and the film-forming component is a constituent component of a film-forming material capable of forming a film on the cutting edge portion by plating or thermal spraying; The base metal portion includes a first film-forming component detection portion near the joint surface, in which the concentration of the detected film-forming component is higher than the concentration of the film-forming component contained in the base metal material; The base metal portion includes a second film-forming component detection portion inside it, in which the concentration of the film-forming component is equal to or lower than the concentration of the film-forming component contained in the base metal material, and The first film-forming component detection portion includes a portion where the concentration of the film-forming component gradually decreases as it approaches the second film-forming component detection portion.

3. The cutting blade according to claim 1, wherein The cutting edge portion contains titanium carbide as the cutting edge material; The cutting edge component contains titanium; The base metal portion contains nickel-containing stainless steel as the base metal material; The base metal portion includes a first nickel detection portion near the joint surface, in which the detected nickel concentration is higher than the nickel concentration contained in the base metal material; The base metal portion includes a second nickel detection portion inside it, in which the nickel concentration is equal to or lower than the nickel concentration contained in the base metal material, and The first nickel detection portion includes a portion where the nickel concentration gradually decreases as it approaches the second nickel detection portion, and The base metal portion is directly joined to the cutting edge portion.

4. The cutting blade according to claim 1, wherein The base metal portion includes a film-forming component detection portion near the joint surface, in which a film-forming component is detected, and the film-forming component is a constituent component of a film-forming material capable of forming a film on the cutting edge portion by plating or thermal spraying; The base metal portion includes a portion below the film-forming component detection limit inside it, in which the concentration of the film-forming component is equal to or lower than its detection limit, and The film-forming component detection part includes a part where the concentration of the film-forming component gradually decreases as it approaches the part below the detection limit of the film-forming component.

5. A granulating device, comprising: The cutting blade according to any one of claims 1 to 4; A cutting blade support part, to which the cutting blade is connected; And A die plate.

6. A method for manufacturing a cutting blade, comprising the following steps: Forming a film on at least a predetermined joint surface of the cutting edge part by plating or thermal spraying with a film-forming material, the cutting edge part being designed to slide along the plate surface of the die plate so as to cut the material extruded onto the plate surface from a hole formed in the plate surface; Arranging the cutting edge part in a cavity of a mold; Filling the cavity with a molten material such that the molten material contacts the joint surface of the cutting edge part, the molten material being obtained by a base metal material contained in a molten base metal part; and Solidifying the molten material so as to join the base metal part to the joint surface of the cutting edge part, wherein The step of joining the base metal part to the joint surface is performed such that: The base metal part includes a cutting edge component detection part near the joint surface, in which a cutting edge component is detected, the cutting edge component being a constituent component of the cutting edge material contained in the cutting edge part; The base metal part includes a part below the detection limit of the cutting edge component inside it, the part below the detection limit of the cutting edge component being a part where the concentration of the cutting edge component is equal to or lower than its detection limit; and The cutting edge component detection part includes a part where the concentration of the cutting edge component gradually decreases as it approaches the part below the detection limit of the cutting edge component.

7. The method for manufacturing a cutting blade according to claim 6, wherein The step of filling the cavity with the molten material is performed such that the base metal material contains a film-forming component, the film-forming component being a constituent component of the film-forming material, and The step of joining the base metal part to the joint surface is performed such that: The base metal part includes a first film-forming component detection part near the joint surface, in which the concentration of the film-forming component detected is higher than the concentration of the film-forming component contained in the base metal material; The base metal part includes a second film-forming component detection part inside it, in which the concentration of the film-forming component is equal to or lower than the concentration of the film-forming component contained in the base metal material; and The first film-forming component detection part includes a part where the concentration of the film-forming component gradually decreases as it approaches the second film-forming component detection part.

8. The manufacturing method of the cutting blade according to claim 6, wherein, It further includes a step of obtaining the thickness of the film before the step of forming the film with the film-forming material, at which thickness, when the molten material solidifies, the film disappears and the base metal part thus joins directly to the cutting edge part, wherein The step of joining the base metal part to the joint surface is performed such that the base metal part joins directly to the cutting edge part.

9. The method for manufacturing a cutting blade according to claim 8, wherein In the step of obtaining the thickness of the film, the thickness of a nickel film containing nickel and formed on the bonding surface is obtained. The thickness of the nickel film is such that when the molten material contacts the nickel film and the molten material is thereby solidified, the nickel film disappears and the base metal part is thereby directly bonded to the cutting edge part. Perform the step of forming the film with the film-forming material such that: The cutting edge part contains titanium carbide as the cutting edge material; The cutting edge composition contains titanium; and The nickel film is formed on the bonding surface by the plating or the thermal spraying. Perform the step of filling the chamber with the molten material such that the base metal part contains nickel-containing stainless steel as the base metal material, and Perform the step of bonding the base metal part to the bonding surface such that: The base metal part includes a first nickel detection part near the bonding surface, in which the concentration of nickel detected is higher than the concentration of nickel contained in the base metal material. The base metal part includes a second nickel detection part inside it, in which the concentration of nickel is equal to or lower than the concentration of nickel contained in the base metal material, and The first nickel detection part includes a part where the concentration of nickel gradually decreases as it approaches the second nickel detection part.

10. The method for manufacturing a cutting blade according to claim 6, wherein Perform the step of bonding the base metal part to the bonding surface such that: The base metal part includes a film-forming component detection part near the bonding surface, in which a film-forming component is detected, and the film-forming component is a constituent component of the film-forming material; The base metal part includes a part below the detection limit of the film-forming component inside it, in which the concentration of the film-forming component is equal to or lower than its detection limit, and The film-forming component detection part includes a part where the concentration of the film-forming component gradually decreases as it approaches the part below the detection limit of the film-forming component.

11. The manufacturing method of the cutting blade according to any one of claims 6 to 10, wherein, Perform the step of filling the chamber with the molten material and the step of bonding the base metal part to the bonding surface in the atmosphere.

Images