Crushing blade for shear-type crusher and manufacturing method thereof

Abstract

This invention suppresses the decrease in abrasion resistance caused by the inclusion of base material components in the shearing edges of crushing blades used in shear-type crushers. [Solution] The crushing blade comprises a thick disk-shaped base material and a side edge formed on the outer edge of the side surface of the base material. The base material has an outer edge step portion that is recessed in the thickness direction of the base material at the outer edge of the side surface to form a step. The size of the outer edge step portion is longer in the radial direction than in the thickness direction. The side edge includes a first overlay weld layer formed between the inner peripheral end and the outer peripheral end of the outer edge step portion, a second overlay weld layer formed on the outer peripheral end side of the first overlay weld layer, a third overlay weld layer formed from the inner peripheral end side of the first overlay weld layer to the second overlay weld layer, and a fourth overlay weld layer formed on the third overlay weld layer. The fourth overlay weld layer forms the cutting edge of the side edge.

Description

[Technical field]

[0001] This specification discloses a technique relating to a crushing blade for a shear-type crusher and a manufacturing method thereof. [Background technology]

[0002] Known shear-type crushers for crushing objects to be crushed use crushing blades in the shape of thick disks with multiple protrusions protruding in the radial direction (see Patent Documents 1 and 2). The tips of the protrusions on the crushing blades and the outer edges of the sides are formed with shear edges that bite into the objects to be crushed in order to shear them. The shear edges of the crushing blades wear down as the crushing process is repeated. For this reason, the shear edges are required to be wear-resistant. Patent Documents 1 and 2 describe a technique for forming or regenerating the shear edges of the crushing blades by build-up welding. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-196610 A [Patent Document 2] Patent Publication No. 2022-70629 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology of forming or regenerating the shearing edge of the crushing blade by overlay welding has room for improvement in terms of improving the wear resistance of the shearing edge. [Means for solving the problem]

[0005] The technology disclosed in this specification can be realized in the following forms.

[0006] (1) One embodiment disclosed in the present specification is a method for manufacturing a crushing blade. The crushing blade includes a base material having a thick disk shape and a side edge formed on an outer edge of a side surface of the base material. In the method for manufacturing the crushing blade, a base material to be processed is prepared, which is the base material before the side edge is formed; the outer edge of the side surface of the base material to be processed is cut in the thickness direction and radial direction of the base material to form an outer edge step portion that is longer in the radial direction than in the thickness direction; a first buildup weld is formed by weaving in the radial direction from the inner peripheral end to the outer peripheral end of the outer edge step portion, thereby forming a first buildup weld layer between the inner peripheral end and the outer peripheral end of the outer edge step portion; and after forming the first buildup weld layer, a second buildup weld is formed by weaving in the radial direction on an outer peripheral side portion of the first buildup weld layer on the outer peripheral end side, thereby forming a first buildup weld layer. a second weld overlay layer is formed on the outer circumferential portion of the first weld overlay layer; after forming the second weld overlay layer, a third weld overlay is formed on the second weld overlay layer by weaving in the radial direction from an inner circumferential portion of the first weld overlay layer that is different from the outer circumferential portion, thereby forming a third weld overlay layer on the first weld overlay layer and the second weld overlay layer; after forming the third weld overlay layer, a fourth weld overlay is formed on the third weld overlay layer by weaving in the radial direction; and the first to fourth weld overlay layers are cut to machine the side edge so that a cutting edge of the side edge becomes the fourth weld overlay layer. According to the manufacturing method of the crushing blade in this embodiment, the first weld overlay layer, the second weld overlay layer, and the third weld overlay layer are interposed between the cutting edge of the side edge, which is the shearing edge, and the base material, so that the amount of base material components mixed in the side edge can be reduced from the base material toward the cutting edge, thereby suppressing the decrease in wear resistance caused by the mixing of base material components in the side edge of the crushing blade.

[0007] (2) In the manufacturing method of the crushing blade in the above-mentioned embodiment, when performing at least one of the first to fourth overlay welds, the base material to be processed may be tilted so that both the first surface along the thickness direction and the second surface along the radial direction of the outer edge step at the processing location where the overlay weld is performed face upward. According to the manufacturing method of the crushing blade in this embodiment, it is easier to keep the molten metal during the overlay weld at a desired position compared to the case where it is not. This makes it easy to form the first to fourth overlay weld layers on the outer edge step so that the fourth overlay weld layer becomes the cutting edge of the side edge.

[0008] (3) In the manufacturing method of the crushing blade in the above-mentioned embodiment, the workpiece base material may be formed in a thick disk shape having a plurality of protruding portions protruding in the radial direction, and the crushing blade may further include a tip edge formed at the tip of the protruding portion. In the manufacturing method of the crushing blade in this embodiment, the tip of the protruding portion in the workpiece base material is cut to form a tip surface on the protruding portion; after forming the tip surface, a plurality of overlay weld layers are formed by stacking on the tip surface; and the plurality of overlay weld layers formed on the tip surface may be cut to cut out the tip edge so that the overlay weld layer farthest from the workpiece base material among the plurality of overlay weld layers becomes the cutting edge of the tip edge. According to the manufacturing method of the crushing blade in this embodiment, since a plurality of overlay weld layers are interposed between the cutting edge of the tip edge, which is a shear edge, and the base material, the amount of the base material components mixed in the tip edge can be reduced from the base material to the cutting edge. This can suppress the decrease in wear resistance caused by the mixing of the base material components in the tip edge of the crushing blade.

[0009] (4) One embodiment disclosed in the present specification is a crushing blade used in a shear-type crusher. The crushing blade includes a base material having a thick disk shape and a side edge formed on the outer edge of a side surface of the base material. The base material has an outer edge step portion that is recessed in the thickness direction and radial direction of the base material at the outer edge of the side surface to form a step. The size of the outer edge step portion is longer in the radial direction than in the thickness direction. The side edge includes a first overlay weld layer formed between an inner peripheral end and an outer peripheral end of the outer edge step portion; a second overlay weld layer formed on an outer peripheral side portion of the first overlay weld layer on the outer peripheral end side; a third overlay weld layer formed on the second overlay weld layer from an inner peripheral side portion of the first overlay weld layer different from the outer peripheral side portion; and a fourth overlay weld layer formed on the third overlay weld layer. The fourth overlay weld layer forms a cutting edge of the side edge. According to the crushing blade of this embodiment, the first weld overlay layer, the second weld overlay layer, and the third weld overlay layer are interposed between the cutting edge of the side edge, which is the shearing edge, and the base material, so that the amount of base material components mixed in the side edge can be reduced from the base material toward the cutting edge, thereby suppressing the decrease in wear resistance caused by the mixing of base material components in the side edge of the crushing blade.

[0010] In the crushing blade of the above-mentioned embodiment, the base material may be in the form of a thick disk having a plurality of protruding portions protruding in the radial direction, and the crushing blade may further include a tip edge formed at the tip of the protruding portion. In this case, the tip edge may include a plurality of overlay weld layers laminated on the protruding portion of the base material, and the overlay weld layer farthest from the base material among the plurality of overlay weld layers may form the cutting edge of the tip edge. According to the crushing blade of this embodiment, since a plurality of overlay weld layers are interposed between the cutting edge of the tip edge, which is a shear edge, and the base material, it is possible to reduce the mixing of components from the base material into the tip edge as it moves from the base material to the cutting edge. This makes it possible to suppress the decrease in wear resistance caused by the mixing of base material components in the tip edge of the crushing blade.

[0011] The technology disclosed in this specification can be realized in various forms other than the crushing blade for a shearing crusher and the manufacturing method thereof. The technology disclosed in this specification can be realized in the form of, for example, a shearing crusher, a crushing blade part, etc. The technology disclosed in this specification may be applied to a new crushing blade or a recycled crushing blade. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view showing a configuration of a crushing blade. [Diagram 2] FIG. 2 is an explanatory diagram showing the configuration of a crushing blade. [Diagram 3] FIG. 4 is an enlarged cross-sectional view showing a detailed structure of a side edge. [Figure 4] FIG. 4 is an enlarged cross-sectional view showing the detailed structure of the tip edge. [Diagram 5] 4A to 4C are process diagrams showing a method for manufacturing a crushing blade. [Figure 6] FIG. 2 is an explanatory diagram showing a configuration of a base material. [Figure 7] FIG. 4 is an explanatory diagram showing the configuration of a base material on which an outer edge step portion is formed. [Figure 8] FIG. 4 is an enlarged cross-sectional view showing a detailed structure of an outer edge step portion. [Figure 9] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 10] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 11] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 12] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 13] FIG. 2 is an explanatory diagram showing the configuration of a base material on which a tip surface is formed. [Figure 14] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 15] FIG. 4 is an explanatory diagram showing how a weld overlay layer is applied. [Figure 16] FIG. 11 is an explanatory diagram showing a state in which a side edge is formed. [Figure 17] FIG. 11 is an explanatory diagram showing how a tip edge is formed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Fig. 1 is a perspective view showing the configuration of the crush blade 100. Fig. 2 is an explanatory diagram showing the configuration of the crush blade 100. Fig. 2(a) shows a side view of the crush blade 100. Fig. 2(b) shows a front view of the crush blade 100.

[0014] The crushing blade 100 is used in a shearing type crusher (not shown) for crushing materials to be crushed (for example, industrial waste). The crushing blade 100 includes a base material 110, a side edge 130, and a tip edge 150.

[0015] The base material 110 has a thick disk shape. The base material 110 is made of a steel material (e.g., chrome molybdenum steel) having toughness. The base material 110 has two side surfaces 112, a plurality of outer peripheral surfaces 114, a through hole 116, and a plurality of protruding portions 118. The two side surfaces 112 are surfaces constituting the side surfaces of the base material 110 having a thick disk shape. The plurality of outer peripheral surfaces 114 are surfaces constituting the outer peripheral surface of the base material 110 having a thick disk shape. The through hole 116 is a hole that fits into a rotating shaft (not shown) of a shear type crusher. The plurality of protruding portions 118 are portions protruding in the radial direction of the base material 110 having a thick disk shape. In this embodiment, the number of protruding portions 118 is five. In other embodiments, the number of protruding portions 118 may be four or less, or six or more.

[0016] The side edge 130 is a shear edge formed on the outer edge of the side surface 112 of the base material 110. The side edge 130 is formed around the entire outer edge of each of the two side surfaces 112.

[0017] The leading edge 150 is a shear edge formed at the tip of the protruding portion 118 of the base material 110. The leading edge 150 is formed over the entire area of ​​the tip of each of the multiple protruding portions 118.

[0018] FIG. 3 is an enlarged cross-sectional view showing the detailed structure of the side edge 130. FIG. 3 corresponds to the F3-F3 cross section shown in FIG. 2(a). The side edge 130 is formed at an outer edge step 140p of the base material 110. The outer edge step 140p is recessed in the thickness direction and radial direction of the base material 110 at the outer edge of the side surface 112 of the base material 110 to form a step shape. The outer edge step 140p has a radial length L2 longer than a thickness direction length L1. The side edge 130 has a blade surface 132, a blade surface 134, a cutting edge 135, an overlay weld layer 210, an overlay weld layer 220, an overlay weld layer 230, and an overlay weld layer 240.

[0019] The cutting surface 132 of the side edge 130 is a cutting surface formed on the same plane as the side surface 112 of the base material 110. The cutting surface 134 of the side edge 130 is a cutting surface formed on the same plane as the outer circumferential surface 114 of the base material 110. The cutting edge 135 of the side edge 130 is a corner where the cutting surface 132 and the cutting surface 134 intersect.

[0020] The welded overlay layer 210 of the side edge 130 is a first welded overlay layer formed between the inner circumferential end 141p and the outer circumferential end 149p of the outer edge step 140p. The welded overlay layer 220 of the side edge 130 is a second welded overlay layer laminated on an outer circumferential side portion 211 of the welded overlay layer 210 on the outer circumferential end 149p side. The welded overlay layer 230 of the side edge 130 is a third welded overlay layer laminated on the welded overlay layer 220 from an inner circumferential side portion 212 different from the outer circumferential side portion 211 of the welded overlay layer 210. The welded overlay layer 240 of the side edge 130 is a fourth welded overlay layer laminated on the welded overlay layer 230. The material of the welded overlay layers 210 to 240 is a steel material containing chromium, manganese, molybdenum, etc. and having toughness. The material of the overlay weld layers 210 to 240 is a steel material having a higher hardness than the material of the base metal 110 .

[0021] The weld overlay layer 230 and the weld overlay layer 240 are exposed on the blade surface 132 of the side edge 130 shown in FIG. 3. The first weld overlay layer 210 may or may not be exposed on the blade surface 132. The weld overlay layer 210, the weld overlay layer 220, the weld overlay layer 230, and the weld overlay layer 240 are exposed on the blade surface 134 of the side edge 130 shown in FIG. 3. The first weld overlay layer 210 may or may not be exposed on the blade surface 134. The cutting edge 135 of the side edge 130 is formed by the weld overlay layer 240.

[0022] Fig. 4 is an enlarged cross-sectional view showing the detailed structure of the leading edge 150. Fig. 4 corresponds to the F4-F4 cross section shown in Fig. 2(b). The leading edge 150 is formed on the leading end surface 160p of the protruding portion 118 of the base material 110. The leading edge 150 has a cutting surface 152, a cutting surface 154, a cutting tip 155, a weld overlay layer 310, a weld overlay layer 320, a weld overlay layer 330, and a weld overlay layer 340.

[0023] Blade surface 152 of leading edge 150 is a blade surface formed on the same plane as outer peripheral surface 114 facing inward at protrusion 118. Blade surface 1154 of leading edge 150 is a blade surface formed on the same plane as outer peripheral surface 114 facing outward at protrusion 118. Cutting edge 155 of leading edge 150 is a corner where blade surface 152 and blade surface 154 intersect.

[0024] The welded overlay layer 310 of the leading edge 150 is a fifth welded overlay layer laminated on the leading edge surface 160p. The welded overlay layer 320 of the leading edge 150 is a sixth welded overlay layer laminated on the welded overlay layer 310. The welded overlay layer 330 of the leading edge 150 is a seventh welded overlay layer laminated on the welded overlay layer 320. The welded overlay layer 340 of the leading edge 150 is an eighth welded overlay layer laminated on the welded overlay layer 330. The welded overlay layer 340 is the welded overlay layer farthest from the leading edge surface 160p among the multiple welded overlay layers 310 to 340 constituting the leading edge 150. The material of the welded overlay layers 310 to 340 is a steel material containing chromium, manganese, molybdenum, etc. and having toughness. The material of the overlay weld layers 310 to 340 is a steel material having a higher hardness than the material of the base metal 110 .

[0025] A plurality of weld build-up layers 310-340 are exposed on cutting surfaces 152, 154 of the leading edge 150. A cutting tip 155 of the leading edge 150 is formed by the weld build-up layer 340.

[0026] 5 is a process diagram showing a manufacturing method of the crushing blade 100. The manufacturer of the crushing blade 100 prepares a base material 110B, which is a processed base material before the side edges 130 and the tip edge 150 are formed (step S110). The base material 110B may be a new steel material processed into a shape equivalent to the crushing blade 100. The base material 110B may also be a used crushing blade 100 whose side edges 130 and the tip edge 150 have been worn.

[0027] Fig. 6 is an explanatory diagram showing the configuration of the base material 110B. Fig. 6(a) shows a side view of the base material 110B. Fig. 6(b) shows a front view of the base material 110B. The base material 110B has two side surfaces 112, multiple outer peripheral surfaces 114, through holes 116, and multiple protrusions 118, similar to the base material 110 of the crushing blade 100.

[0028] Returning to the explanation of Fig. 5, after preparing the base material 110B (step S110), the manufacturer forms an outer edge step 140 in the base material 110B by cutting (step S120). The outer edge step 140 of the base material 110B is a structure that becomes the base of the outer edge step 140p of the crushing blade 100, which is the finished product.

[0029] FIG. 7 is an explanatory diagram showing the configuration of the base material 110B on which the outer edge step 140 is formed. FIG. 7(a) shows a side of the base material 110B. FIG. 7(b) shows a front of the base material 110B. FIG. 8 is an enlarged cross-sectional view showing the detailed structure of the outer edge step 140. The F8-F8 cross section in FIG. 8 corresponds to the F8-F8 cross section shown in FIG. 7(a). The outer edge step 140 is formed by cutting the outer edge 130B of the side surface 112 of the base material 110B. The outer edge step 140 is formed around the entire circumference of the outer edge of each of the two side surfaces 112. The outer edge step 140 is recessed in the thickness direction and radial direction of the base material 110B at the outer edge of the side surface 112 of the base material 110B to form a step shape.

[0030] The outer edge step 140 has an inner peripheral end 141, a step surface 142, a corner 145, a step surface 148, and an outer peripheral end 149. The inner peripheral end 141 is a portion where the side surface 112 and the step surface 142 intersect. The step surface 142 is a surface perpendicular to the side surface 112. The corner 145 is a portion where the step surface 142 and the step surface 148 intersect at right angles. The step surface 148 is a surface perpendicular to the outer peripheral surface 114. The outer peripheral end 149 is a portion where the outer peripheral surface 114 and the step surface 148 intersect. The size of the outer edge step 140 is such that the radial length L4 is longer than the thickness length L3. In this embodiment, L3=5 mm, and L4=15 mm.

[0031] Returning to the explanation of FIG. 5, after forming the outer peripheral step 140 (step S120), the manufacturer laminates a plurality of weld overlay layers 210-240 on the outer peripheral step 140 by overlay welding (step S130). The material of the weld overlay layers 210-240 is a steel material having a higher hardness than the material of the base material 110B. When overlay welding is performed on the outer peripheral step 140 (step S130), it is preferable to tilt the base material 110B so that both the step surface 142 and the step surface 148 of the outer peripheral step 140 at the processing location where the overlay welding is performed face upward.

[0032] 9 is an explanatory diagram showing how the weld overlay layer 210 is applied. The F9-F9 cross section in FIG. 9 corresponds to the F8-F8 cross section in FIG. 8. The manufacturer applies a first overlay weld by radial weaving M1 to the inner peripheral end 141 to the outer peripheral end 149 of the outer peripheral step 140 all around the side surface 112, thereby forming the weld overlay layer 210 between the inner peripheral end 141 to the outer peripheral end 149 of the outer peripheral step 140. As a result, an outer peripheral step 140p is formed at the boundary between the base material 110B and the weld overlay layer 210 instead of the outer peripheral step 140.

[0033] Fig. 10 is an explanatory diagram showing how to apply the overlay weld layer 220. The F10-F10 cross section in Fig. 10 corresponds to the F9-F9 cross section in Fig. 9. After forming the overlay weld layer 210, the manufacturer applies a second overlay weld by radial weaving M2 to an outer periphery side portion 211 of the overlay weld layer 210 on the outer periphery side portion 211 of the overlay weld layer 210, the second overlay weld being applied around the entire circumference of the side surface 112.

[0034] Fig. 11 is an explanatory diagram showing how to apply the overlay weld layer 230. The F11-F11 cross section in Fig. 11 corresponds to the F10-F10 cross section in Fig. 10. After forming the overlay weld layer 220, the manufacturer applies a third overlay weld by radial weaving M3 to the overlay weld layer 220 from an inner peripheral side portion 212 different from the outer peripheral side portion 211 of the overlay weld layer 210 around the entire circumference of the side surface 112, thereby laminating the overlay weld layer 230 on the overlay weld layer 210o and the overlay weld layer 220.

[0035] Fig. 12 is an explanatory diagram showing the construction of the weld overlay layer 240. The F12-F12 cross section in Fig. 12 corresponds to the F11-F11 cross section in Fig. 11. After forming the weld overlay layer 230, the manufacturer applies a fourth overlay weld by radial weaving M4 to the weld overlay layer 230 around the entire circumference of the side surface 112, thereby laminating the weld overlay layer 240 on the weld overlay layer 230.

[0036] Returning to the explanation of Fig. 5, after forming the multiple overlay weld layers 210-240 (step S130), the manufacturer forms a tip surface 160 on the protruding portion 118 of the base material 110B by cutting (step S140). The tip surface 160 of the base material 110B is a structure that becomes the tip surface 160p of the crushing blade 100, which is the finished product.

[0037] Fig. 13 is an explanatory diagram showing the configuration of the base material 110B on which the tip surface 160 is formed. The F13-F13 cross section in Fig. 13 corresponds to the F13-F13 cross section in Fig. 7. The tip surface 160 is formed by cutting the tip 150B of the protruding portion 118 of the base material 110B. In this embodiment, the cutting length L5 for cutting when forming the tip surface 160 is the length at which the tip surface 160 is formed at a position 9.5 mm from the cutting edge 155 of the crushing blade 100, which is the finished product.

[0038] Returning to the explanation of Fig. 5, after forming the tip surface 160 (step S140), the manufacturer laminates a plurality of weld overlay layers 310-340 on the tip surface 160 by overlay welding (step S150). The material of the weld overlay layers 310-340 is a steel material having a higher hardness than the material of the base material 110B. When overlay welding is performed on the tip surface 160 (step S150), it is preferable to tilt the base material 110B so that the tip surface 160 at the processing location where the overlay welding is performed faces upward.

[0039] Fig. 14 is an explanatory diagram showing how to apply the weld overlay layer 310. The F14-F14 cross section in Fig. 14 corresponds to the F13-F13 cross section in Fig. 13. The manufacturer applies a fifth overlay weld by weaving M5 in the direction along the side surface 112 to the front end surface 160 over the entire width of the front end surface 160, thereby forming the weld overlay layer 310 on the front end surface 160. As a result, a front end surface 160p is formed in place of the front end surface 160 at the boundary between the base material 110B and the weld overlay layer 310.

[0040] Fig. 15 is an explanatory diagram showing how the overlay weld layers 320 to 340 are applied. The F15-F15 cross section in Fig. 15 corresponds to the F14-F14 cross section in Fig. 14. The manufacturer applies a sixth overlay weld by weaving M5 in the direction along the side surface 112 to the overlay weld layer 310, thereby forming the overlay weld layer 320 on the overlay weld layer 310. Thereafter, the manufacturer applies a seventh overlay weld to laminate the overlay weld layer 330 on the overlay weld layer 320 in the same manner as the sixth overlay weld, and then applies an eighth overlay weld to laminate the overlay weld layer 340 on the overlay weld layer 330.

[0041] Returning to the explanation of Fig. 5, after laminating the multiple overlay weld layers 310 to 340 (step S150), the manufacturer forms the side edges 130 and the tip edge 150 by cutting (step S160). In this way, the crushing blade 100 is completed.

[0042] Fig. 16 is an explanatory diagram showing how the side edge 130 is formed. The F16-F16 cross section in Fig. 16 corresponds to the F12-F12 cross section in Fig. 12. The manufacturer cuts the overlay weld layers 210-240 along a cutting surface LC1 that is flush with the side surface 112 and a cutting surface LC2 that is flush with the outer circumferential surface 114, thereby cutting out the side edge 130 so that the cutting edge 135 of the side edge 130 becomes the overlay weld layer 240.

[0043] Fig. 17 is an explanatory diagram showing how to form the leading edge 150. The F17-F17 cross section in Fig. 17 corresponds to the F15-F15 cross section in Fig. 15. The manufacturer cuts the weld overlay layers 310-340 along cutting surface LC3 which is flush with the outer peripheral surface 114 facing outward, and cutting surface LC4 which is flush with the inner peripheral surface 114, thereby cutting out the leading edge 150 so that the cutting edge 155 of the leading edge 150 becomes the weld overlay layer 340.

[0044] According to the crushing blade 100 described above, since the build-up weld layer 210, the build-up weld layer 220, and the build-up weld layer 230 are interposed between the cutting edge 135 of the side edge 130 and the base material 110, the amount of base material components mixed in the side edge 130 can be reduced from the base material 110 toward the cutting edge 135. This makes it possible to suppress a decrease in wear resistance at the side edge 130 of the crushing blade 100 due to the mixing of base material components.

[0045] In addition, according to the crushing blade 100, since a plurality of overlay weld layers 310-340 are interposed between the cutting edge 155 of the leading edge 150 and the base material 110, the amount of base material components mixed in the leading edge 150 can be reduced from the base material 110 toward the cutting edge 155. This makes it possible to suppress a decrease in wear resistance at the leading edge 150 of the crushing blade 100 due to the mixing of base material components.

[0046] In the manufacturing method of the crushing blade 100, when overlay welding is performed on the outer edge step 140 (step S130), the base material 110B is tilted so that both the step surface 142 and the step surface 148 of the outer edge step 140 at the processing location where the overlay welding is performed face upward, so that the molten metal during overlay welding can be easily kept at the desired position compared to the case where this is not the case. This makes it easy to form multiple overlay weld layers 210-240 on the outer edge step 140 so that the overlay weld layer 240 becomes the cutting edge 135 of the side edge 130.

[0047] The technology disclosed in this specification is not limited to the above-mentioned embodiment, example, and modification, and can be realized in various configurations without departing from the spirit thereof. For example, among the technical features in the above-mentioned embodiment, example, and modification, those corresponding to the technical features in each form described in the Summary of the Invention column can be appropriately replaced and combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. In addition, technical features that are not described as essential in this specification can be appropriately deleted.

[0048] For example, in addition to the weld overlay layers 220 and 230, an additional weld overlay layer may be laminated between the weld overlay 210 and the weld overlay 240 of the side edge 130. Also, in addition to the weld overlay layers 320 and 330, an additional weld overlay layer g may be laminated between the weld overlay 310 and the weld overlay 340 of the tip edge 150. [Explanation of symbols]

[0049] 100…Crushing blade 110...Base material 110B…Base material 112...Side 114...Outer surface 116...Through hole 118...Protruding part 130…Side edge 130B…Outer edge 132…Blade surface 134…Blade surface 135…Cutting edge 140...Outer edge step 140p…Outer edge step 141…Inner circumference end 141p…Inner edge 142...Stepped surface 145…Corner 148...Stepped surface 149...Outer edge 149p…Outer edge 150…Tip edge 152…Blade surface 154...Blade surface 155…Edge 160…Tip surface 160p…Tip surface 210…Weld overlay 211...Outer circumference part 212…Inner circumference side part 220…Weld overlay 230…Weld overlay 240…Weld overlay 310…Weld overlay 320…Weld overlay 330…Weld overlay 340…Weld overlay

Claims

1. A thick disk-shaped base material; A side edge formed on the outer edge of the side surface of the base material; A method for manufacturing a crushing blade comprising: preparing a base material to be processed, which is the base material before the side edge is formed; The outer edge of the side surface of the workpiece is cut in the thickness direction and the radial direction of the workpiece, thereby forming an outer edge step portion which is longer in the radial direction than in the thickness direction; A first build-up weld layer is formed between the inner circumferential end and the outer circumferential end of the outer edge step by performing a first build-up weld by weaving in the radial direction from the inner circumferential end to the outer circumferential end of the outer edge step; After forming the first weld overlay layer, a second weld overlay is formed on an outer peripheral portion of the first weld overlay layer on the outer peripheral end side by performing a second weld overlay by weaving in the radial direction, thereby forming a second weld overlay layer on the outer peripheral portion of the first weld overlay layer; After forming the second weld overlay layer, a third weld overlay is formed on the first weld overlay layer and the second weld overlay layer by weaving in the radial direction from an inner peripheral side portion of the first weld overlay layer that is different from the outer peripheral side portion of the first weld overlay layer to the second weld overlay layer, After forming the third weld overlay layer, a fourth weld overlay is formed on the third weld overlay layer by weaving in the radial direction, thereby forming a fourth weld overlay layer on the third weld overlay layer; a cutting edge for cutting the first to fourth weld overlay layers, thereby cutting out the side edge so that a cutting edge of the side edge becomes the fourth weld overlay layer.

2. A method for manufacturing the crushing blade according to claim 1, When performing at least one of the first to fourth overlay welds, the workpiece base material is tilted so that both a first surface along the thickness direction and a second surface along the radial direction of the outer edge step at the location where the overlay weld is performed face upward.

3. A method for manufacturing the crushing blade according to claim 1 or 2, The workpiece base material is in the form of a thick disk having a plurality of protruding portions protruding in a radial direction, The crushing blade further includes a tip edge formed at the tip of the protrusion, a tip end surface is formed on the protrusion by cutting the tip end of the protrusion in the workpiece base material; After forming the tip surface, a plurality of overlay weld layers are laminated on the tip surface, a cutting edge formed on the tip surface of the cutting blade, the cutting edge being cut out such that the weld overlay layer farthest from the workpiece base material among the weld overlay layers becomes a cutting edge of the tip edge.

4. A crushing blade used in a shear-type crusher, A thick disk-shaped base material; A side edge formed on the outer edge of the side surface of the base material; Equipped with the base material has an outer edge step portion that is recessed in a thickness direction and a radial direction of the base material at the outer edge of the side surface to form a step shape, The outer edge step has a size longer in the radial direction than in the thickness direction, The side edge is A first overlay weld layer formed between an inner peripheral end and an outer peripheral end of the outer edge step; A second overlay weld layer formed on an outer peripheral side portion of the first overlay weld layer on the outer peripheral end side; A third overlay weld layer formed on the second overlay weld layer from an inner peripheral side portion of the first overlay weld layer that is different from the outer peripheral side portion; and a fourth overlay weld layer formed on the third overlay weld layer; Including, The fourth weld overlay layer forms a cutting edge of the side edge.

5. The crushing blade according to claim 4, The base material is in the form of a thick disk having a plurality of protruding portions protruding in a radial direction, The crushing blade further includes a tip edge formed at the tip of the protrusion, The tip edge includes a plurality of overlay weld layers laminated on the protruding portion of the base material, The overlay weld layer farthest from the base material among the plurality of overlay weld layers forms a cutting edge of the tip edge.

Images