JP7489709B2 - Rotary blade and manufacturing method thereof - Google Patents

Description

The present invention relates to a rotary blade for shearing a strand of pellet material formed into a long shape with a fixed blade and a rotary blade to form pellets, and a method for manufacturing the rotary blade.

2. Description of the Related Art As a pellet manufacturing machine for manufacturing pellets of resin or the like, for example, as disclosed in Patent Document 1 listed below, a machine that cuts a strand between a fixed blade and a rotary blade is known.
Patent Document 1 discloses a rotary blade provided with a helical blade. The rotary blade of Patent Document 1 has a helical blade provided over the entire length of the rotary blade.

Patent No. 5336548

However, because helical blades are formed in a spiral shape, the cutting blade itself must be formed in a spiral shape, which makes processing and manufacturing difficult and costly, and also makes it difficult to improve precision. Furthermore, cutting blades are generally attached to rotary blades by brazing, so the helical cutting blade must be brazed to a helical base. Helical cutting blades are extremely expensive, which increases costs, and they are difficult to attach, making it difficult to improve precision.

In view of the above circumstances, the present invention has been made with an object to provide a relatively low-cost, high-precision rotary blade and a manufacturing method thereof.

In order to achieve the above object, the rotary blade according to the first aspect of the present invention has the following configuration.
The rotary blade is for shearing a strand of pellet material formed into a long shape with a fixed blade and a rotary blade to form pellets,
A cylindrical body having an axis is provided with a plurality of cutting blades arranged in a longitudinal direction at regular intervals in a circumferential direction on an outer peripheral surface thereof,
a cutting edge of each of the cutting blades is disposed at a first inclination angle with respect to the axis;
The cylindrical main body is divided into a plurality of beveled members in the direction of the axis via parallel dividing surfaces having a second inclination angle with respect to the axis.

The rotary blade according to claim 2 has the following features in addition to the features according to claim 1.
Each cutting blade is fitted with a cutting tip disposed along a respective cutting edge line.

The rotary blade according to the third aspect of the present invention employs the following features in addition to the features according to the first or second aspect of the present invention.
The plurality of bevel cutting members are configured to include at least three types: a first bevel cutting member arranged at a first end, a second bevel cutting member arranged at a second end, and one or more intermediate bevel cutting members arranged between the first bevel cutting member and the second bevel cutting member.

The rotary blade according to the fourth aspect of the present invention employs the following features in addition to the features according to the third aspect of the present invention.
The intermediate oblique cutting members are multiple,
The intermediate oblique cutting members are set so that their dimensions in the axial direction are equal to one another.

The rotary blade according to the fifth aspect of the present invention employs the following features in addition to the features according to the third or fourth aspect of the present invention.
The intermediate oblique cutting member is configured such that, when rotated about the axis, the rotation trajectories of the two opposing divided surfaces do not overlap with each other.

In order to achieve the above object, the manufacturing method of the rotary blade according to the sixth aspect of the present invention employs the following configuration.
A method for manufacturing a rotary blade for shearing a strand of pellet material formed into a long shape with a fixed blade and a rotary blade to form pellets, comprising the steps of:
A step of forming a machining mark extending in an axial direction on an outer periphery of a cylindrical material and a shaft hole penetrating in the axial direction;
dividing the cylindrical blank into a plurality of beveled blanks in a direction of the axis by forming dividing surfaces parallel to each other and having a second inclination angle with respect to the axis;
forming a key groove in a shaft hole of each of the oblique cutting blanks;
a step of forming an oblique cutting member by providing a plurality of cutting blades arranged at a first inclination angle with respect to the axis on an outer peripheral surface of each of the oblique cutting materials at regular intervals in a circumferential direction;
The method includes a process of assembling each of the bevel cutting members in a line in the axial direction so that the cutting edge lines of each of the cutting blades are positioned at the first inclination angle with respect to the axial center on the outer peripheral surface of a cylindrical main body having the axial center.

The rotary blade described in claim 1 is a rotary blade for shearing a strand formed of a pellet material into a long shape with a fixed blade and a rotary blade to form pellets. The rotary blade has a cylindrical main body having an axis, and a plurality of cutting blades arranged at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical main body having an axis, the cutting edge lines of the cutting blades being arranged at a first inclination angle with respect to the axis, and the cylindrical main body is divided into a plurality of oblique cutting members in the direction of the axis via mutually parallel dividing surfaces having a second inclination angle with respect to the axis.
As a result, a cutting blade can be formed for each of the multiple divided oblique cutting members, making it possible to provide a highly accurate rotary blade at a relatively low cost.

In the rotary blade according to the second aspect of the present invention, each cutting blade is provided with a cutting tip disposed along the cutting edge line.
Therefore, a cutting tip can be attached to each of the multiple divided oblique cutting members to form a cutting blade, making it possible to provide a highly accurate rotary blade at a relatively low cost.

The rotary blade described in claim 3 is configured such that the multiple bevel cutting members include at least three types: a first bevel cutting member arranged at a first end, a second bevel cutting member arranged at a second end, and one or more intermediate bevel cutting members arranged between the first bevel cutting member and the second bevel cutting member.
Therefore, by increasing or decreasing the number of intermediate bevel cutting members, the overall length of the rotary blade can be easily changed to accommodate a variety of specifications.

In the rotary blade according to a fourth aspect of the present invention, there are a plurality of the intermediate oblique cutting members, and the intermediate oblique cutting members are set so as to have the same dimensions in the axial direction.
Therefore, by increasing or decreasing the number of intermediate bevel cutting members, the overall length of the rotary blade can be easily changed to accommodate a variety of specifications.

The rotary blade according to the present invention is configured such that when the intermediate oblique cutting member rotates about the axis, the rotation trajectories of the two opposing divided surfaces do not overlap with each other.
The rotary blade has many joints between the oblique cutting members arranged in the circumferential direction. The sharpness of the joints is easily reduced, and if there are many joints in the circumferential direction, cutting defects are likely to occur in the same place when the rotary blade rotates around the axis, which may adversely affect the quality of the pellets. In the present invention, when the rotary blade rotates around the axis, the rotation trajectories of the joints do not overlap, so that the adverse effect on the quality of the pellets can be minimized.

The manufacturing method of the rotary blade according to claim 6 is a manufacturing method of the rotary blade for shearing a strand formed of a pellet material in a long shape with a fixed blade and a rotary blade to form pellets. First, a processing mark extending in the axial direction and an axial hole penetrating in the axial direction are formed on the outer periphery of a cylindrical material. Next, the cylindrical material is divided into a plurality of obliquely cut materials in the axial direction by forming parallel dividing surfaces having a second inclination angle with respect to the axial center. Next, a key groove is formed in the axial hole of each of the obliquely cut materials. Furthermore, a plurality of cutting blades arranged at a first inclination angle with respect to the axial center are provided at regular intervals in the circumferential direction on the outer periphery of each of the obliquely cut materials to form an obliquely cut member. Then, each of the obliquely cut members is assembled in a line in the axial direction so that the cutting edge line of each of the cutting blades is arranged at the first inclination angle with respect to the axial center on the outer periphery of a cylindrical main body having the axial center.
The rotary blade obtained in this manner can form a cutting blade for each of the multiple divided oblique cutting members, making it possible to provide a highly accurate rotary blade at a relatively low cost.

FIG. 2 is a diagram illustrating an embodiment of a rotary blade of the present invention. FIG. 4 is a diagram illustrating a first oblique cutting member. FIG. 11 is a diagram illustrating a second oblique cutting member. FIG. 13 is a diagram illustrating an intermediate oblique cutting member. FIG. 1 is a diagram illustrating a cylindrical material according to one embodiment of the method for manufacturing a rotary blade of the present invention. FIG. 4A to 4C are diagrams illustrating a process for forming a processing mark and a shaft hole in the cylindrical material. 10A to 10C are diagrams illustrating a process of dividing the cylindrical material into a plurality of obliquely cut materials. The obliquely cut workpieces obtained by the above-mentioned dividing step are (A) the first obliquely cut workpiece, (B) the second obliquely cut workpiece, and (C) the intermediate obliquely cut workpiece. 10A to 10C are diagrams illustrating a process of providing cutting blades on each of the above-mentioned oblique cutting materials to produce oblique cutting members. 11A to 11C are diagrams illustrating a process of forming a mounting seat for a cutting tip. 1A to 1C are diagrams illustrating the steps of attaching and sharpening a cutting tip. 5A to 5C are diagrams illustrating an example of a state in which the rotary blade of the present embodiment is used.

Next, we will explain in detail the embodiment of the present invention.

Figures 1 to 5 show an embodiment of the rotary blade of the present invention. Figure 13 is a diagram illustrating an example of the rotary blade in use.

As shown in FIG. 13, the rotary blade 100 of this embodiment is a rotary blade 100 used in a shearing device that shears a strand 101 formed from a pellet material in a long shape using a fixed blade 102 and a rotary blade 100 to form pellets 103.

[Overall structure]
1A and 1B are views showing the overall structure of the rotary blade 100. (A) is a front view, and (B) is a left side view.

The rotary blade 100 has a plurality of cutting blades 2 arranged at regular intervals in the longitudinal direction on the outer peripheral surface of a cylindrical body 1 having an axis C. Therefore, the cutting blades 2 are arranged on the outer peripheral surface of the cylindrical body 1 over the entire longitudinal length and at a constant pitch over the entire circumference.

The cutting edge line 2A of each cutting blade 2 is disposed at a first inclination angle α with respect to the axis C. The first inclination angle α can be set, for example, to about 2° to 15°. It is further preferable that the cutting edge line 2A is formed in a spiral shape in the longitudinal direction.

The cylindrical body 1 is divided into a plurality of beveled members in the direction of the axis C via parallel dividing surfaces 3 having a second inclination angle β with respect to the axis C. The second inclination angle β can be set to, for example, about 45° to 85°.

In this example, the multiple bevel cutting members are configured with at least three types: a first bevel cutting member 10 arranged at the first end, a second bevel cutting member 20 arranged at the second end, and one or more intermediate bevel cutting members 30 arranged between the first bevel cutting member 10 and the second bevel cutting member 20.

Furthermore, in this example, there are multiple intermediate bevel cutting members 30 (five in the illustrated example). Furthermore, the multiple intermediate bevel cutting members 30 are set so that their dimensions in the direction of the axis C are equal to each other. In the illustrated example, the first bevel cutting member 10 is disposed at the first end, the second bevel cutting member 20 is disposed at the second end, and five intermediate bevel cutting members 30 are disposed between the first bevel cutting member 10 and the second bevel cutting member 20.

The first bevel cutting member 10, the second bevel cutting member 20, and the intermediate bevel cutting member 30 each have an axial hole 4 that is coaxial with the axis C and penetrates in the direction of the axis C. The axial holes 4 of the first bevel cutting member 10, the second bevel cutting member 20, and the intermediate bevel cutting member 30 each have the same diameter, and a shaft 5 for supporting the rotary blade 100 is inserted through them.

The cylindrical body 1 is constituted by the first beveled member 10, the second beveled member 20, and the intermediate beveled member 30, which are aligned with the shaft 5 inserted therethrough. Fastening flanges 6 are attached to the portions of the shaft 5 near both ends, and are adapted to fasten both ends of the first end and the second end of the cylindrical body 1. The fastening flanges 6 can be fastened, for example, by bolts (not shown) or the like, or the shaft 5 can be threaded and fastened by screwing.

[First bevel cutting member 10]
FIG. 2 is a diagram showing the first oblique cutting member 10, where (A) is a front view and (B) is a right side view.

The first bevel cutting member 10 is disposed at the first end. In this example, it is the end on the left side when viewed from the front. The first bevel cutting member 10 has the above-mentioned cutting blade 2 on its outer circumferential surface, and the above-mentioned axial hole 4 is provided coaxially with the axis C. The side surface on the first end side (left side in the figure) is the first end surface 1A perpendicular to the axis C. The side surface on the second end side (right side in the figure) is the second dividing surface 3B inclined at a second inclination angle β with respect to the axis C.

[Second bevel cutting member 20]
FIG. 3 is a diagram showing the second oblique cutting member 20, where (A) is a front view and (B) is a right side view.

The second bevel cutting member 20 is disposed at a second end located opposite the first end. In this example, it is the right end when viewed from the front. The second bevel cutting member 20 has the above-mentioned cutting blade 2 on its outer circumferential surface, and the above-mentioned axial hole 4 is provided coaxially with the axis C. The side surface on the first end side (left side in the figure) is the first division surface 3A inclined at a second inclination angle β with respect to the axis C. The side surface on the second end side (right side in the figure) is the second end surface 1B perpendicular to the axis C.

[Intermediate bevel cutting member 30]
4A and 4B are diagrams showing the intermediate oblique cutting member 30, in which (A) is a front view and (B) is a right side view.

The intermediate bevel cutting members 30 are arranged in a row of five between the first bevel cutting member 10 and the second bevel cutting member 20. The intermediate bevel cutting member 30 has the above-mentioned cutting blade 2 on its outer circumferential surface, and the above-mentioned axial hole 4 is provided coaxially with the axis C. The side surface on the first end side (left side in the figure) is the first divided surface 3A inclined at the second inclination angle β with respect to the axis C. The side surface on the second end side (right side in the figure) is the second divided surface 3B inclined at the second inclination angle β with respect to the axis C.

[Cutting blade 2]
5 is a diagram for explaining the details of the cutting blade 2. In the drawing, the intermediate oblique cutting member 30 is shown and explained, but the same applies to the first oblique cutting member 10 and the second oblique cutting member 20.
A cutting tip 40 is attached to each cutting blade 2 so as to be disposed along the respective cutting edge lines 2A. A mounting seat 41 for mounting the cutting tip 40 is cut out in the cutting blade 2, and the cutting tip 40 is attached to the mounting seat 41 by, for example, brazing.

The cutting tip 40 can be made of a material such as cemented carbide, cermet, or high-speed tool steel.

[Divided surface 3]
1, a first beveled member 10 is disposed at the first end, a second beveled member 20 is disposed at the second end, and five intermediate beveled members 30 are disposed between the first beveled member 10 and the second beveled member 20. In this case, the above-mentioned dividing surface 3 is formed by the first dividing surface 3A on the first end side facing the second dividing surface 3A on the second end side, and the first dividing surface 3A and the second dividing surface 3B being in close contact with each other.

The intermediate bevel cutting member 30 is configured so that the rotation trajectories of the two opposing first and second dividing surfaces 3A and 3B do not overlap when rotated about the axis C. The diameter of the cylindrical member 1, the second inclination angle β, and the dimensions of the intermediate bevel cutting member 30 in the direction of the axis C are each set to achieve this configuration.

〔Production method〕
6 to 13 are diagrams showing an embodiment of a method for manufacturing the rotary blade 100 of the present invention.
The present embodiment relates to a method for manufacturing the rotary blade 101 for shearing a strand 101 formed from a pellet material in a long shape with a fixed blade 102 and a rotary blade 100 to form pellets 103.

6A and 6B are views showing the cylindrical material 51. (A) is a front view, and (B) is a left side view.
In this example, the cylindrical material 51 is cylindrical. As the material of the cylindrical material 51, various carbon steels for machine construction, alloy steels for machine construction, stainless steels, etc., can be used. For example, alloy tool steels, various stainless steels, etc.

7A and 7B are diagrams for explaining the process of forming a machining mark and a shaft hole in the cylindrical material, (A) being a front view and (B) being a left side view.
The outer peripheral surface and both end surfaces of the cylindrical material 51 are roughly cut to size, and the material has an axis C. After the rough cutting process, machining marks 55 extending in the direction of the axis C on the outer periphery and shaft holes 4 penetrating in the direction of the axis C are formed in the cylindrical material 51. In the illustrated example, the machining marks 55 are grooves extending in the direction of the axis C on the outer peripheral surface. The machining marks 55 are provided over the entire length of the cylindrical material 51. In addition, it is preferable to form a flat portion 56 in advance on the outer peripheral surface located opposite the machining marks 55 in order to facilitate the groove machining and post-machining.

8A and 8B are diagrams illustrating the process of dividing the cylindrical blank 51 into a plurality of obliquely cut blanks, in which (A) is a front view and (B) is a left side view.
The cylindrical blank 55 is divided into a plurality of beveled blanks in the direction of the axis C by forming dividing surfaces 3 parallel to each other and having a second inclination angle β with respect to the axis C. This dividing step can be performed, for example, by using a saw or the like.

Figure 9 shows the beveled workpieces obtained by the above-mentioned dividing process. (A-1) and (A-2) are the first beveled workpiece 11, (B-1) and (B-2) are the second beveled workpiece 21, and (C-1) and (C-2) are the intermediate beveled workpieces 31.

Next, a keyway 58 is formed in the shaft hole 4 of each of the beveled materials. The keyway 58 transmits the rotational power of the shaft 5 to each of the beveled materials by fitting a key (not shown) into a space that matches a keyway (not shown) provided in the shaft 5.

[First oblique cutting material 11]
In FIG. 9, (A-1) is a front view of the first oblique cutting material 11, and (A-2) is a left side view.

The first beveled material 11 is processed to become the first beveled member 10 described above. A key groove 58 is formed on the inner surface of the shaft hole 4 of the first beveled material 11. The key groove 58 is formed to extend along the axis C. During processing, the position of the key groove 58 is determined by the processing mark 55 described above. In this example, the position of the key groove 58 is determined so that it is aligned with the axis C and the processing mark 55.

The first beveled material 11 has a first end surface 1A on the side of the first end (left side in the figure) that is perpendicular to the axis C. The side of the second end (right side in the figure) is a second divided surface 3B that is inclined at a second inclination angle β with respect to the axis C.

[Second oblique cutting material 21]
In FIG. 9, (B-1) is a front view of the second oblique cutting material 21, and (B-2) is a left side view.

The second beveled material 21 is processed to become the second beveled member 20 described above. A key groove 58 is formed on the inner surface of the shaft hole 4 of the second beveled material 21, similar to the first beveled material 11.

The second beveled material 21 has a first dividing surface 3A on the side of the first end (left side in the figure) that is inclined at a second inclination angle β with respect to the axis C. The side of the second end (right side in the figure) is a second end surface 1B that is perpendicular to the axis C.

[Intermediate bevel cutting material 31]
In FIG. 9, (C-1) is a front view of the intermediate oblique cutting material 31, and (C-2) is a left side view.

The intermediate bevel cutting material 31 is processed to become the intermediate bevel cutting member 30 described above. A key groove 58 is formed on the inner surface of the shaft hole 4 of the intermediate bevel cutting material 21, similar to the first bevel cutting material 11 and the second bevel cutting material 21.

The side surface of the intermediate beveled material 31 on the first end side (left side in the figure) is a first divided surface 3A inclined at a second inclination angle β with respect to the axis C. The side surface of the second end side (right side in the figure) is a second divided surface 3B inclined at a second inclination angle β with respect to the axis C.

Figure 10 is a diagram explaining the process of providing cutting blades 2 to each of the above-mentioned bevel cutting materials to make them into bevel cutting members. (A-1) and (A-2) are the first bevel cutting members 10, (B-1) and (B-2) are the second bevel cutting members 20, and (C-1) and (C-2) are the intermediate bevel cutting members 30.

In this process, a number of cutting blades 2 are arranged at a first inclination angle α with respect to the axis C at regular intervals in the circumferential direction on the outer peripheral surface of each of the bevel-cutting materials to form a bevel-cutting member.

In Figure 10, (A-1) is a front view of the first bevel cutting member 10, and (A-2) is a right side view. In this process, the cutting blade 2 described above is formed on the outer peripheral surface of the first bevel cutting material 11 to form the first bevel cutting member 10 shown in the figure.

In FIG. 10, (B-1) is a front view of the second bevel cutting member 20, and (B-2) is a right side view. In this process, the above-mentioned cutting blade 2 is formed on the outer peripheral surface of the second bevel cutting material 21 to form the second bevel cutting member 20 shown in the figure.

In FIG. 10, (C-1) is a front view of the intermediate bevel cutting member 30, and (C-2) is a right side view. In this process, the cutting blade 2 described above is formed on the outer peripheral surface of the intermediate bevel cutting material 31, forming the intermediate bevel cutting member 30 shown in the figure.

11 is a diagram illustrating a process for forming the mounting seat 41 of the cutting tip 40. Although the intermediate oblique cutting member 30 is shown in the diagram, the first oblique cutting member 10 and the second oblique cutting member 20 are similarly formed.
The mounting seats 41 are formed by cutting out a front portion of each cutting blade 2 in the direction of rotation (the arrow in the figure).

12A and 12B are diagrams for explaining the process of attaching and sharpening the cutting tip 40. (A) is the attachment process, and (B) is the sharpening process. In the drawings, the intermediate bevel cutting member 30 is shown and explained, but the first bevel cutting member 10 and the second bevel cutting member 20 are similarly described.
12A, a cutting tip 40 is attached to the mounting seat 41 of each cutting blade 2. This attachment can be performed by brazing, for example.
12(B), both surfaces of the attached cutting tip 40 are ground so as to be flush with the first divided surface 3A and the second divided surface 3B. Similarly, in the case of the first beveled cutting member 10, the cutting tip 40 is ground so as to be flush with the first end surface 1A and the second divided surface 3B. In the case of the second beveled cutting member 20, the cutting tip 40 is ground so as to be flush with the second end surface 1B and the first divided surface 3A.

The cutting tip 40 can then be polished to a shape such as that shown in Figure 5.

Then, a process is performed in which the bevel cutting members are aligned in the direction of the axis C and assembled. This ensures that the cutting edge lines 2A of the cutting blades 2 are arranged at the first inclination angle α with respect to the axis C on the outer circumferential surface of the cylindrical body 1 having the axis C (see FIG. 1).

The above embodiment provides the following effects:

The rotary blade 100 of this embodiment is a rotary blade 100 for shearing a strand 101 formed from a pellet material in a long shape with a fixed blade 102 and a rotary blade 100 to form pellets 103. The rotary blade 100 has a plurality of cutting blades 2 arranged in the longitudinal direction at regular intervals in the circumferential direction on the outer peripheral surface of a cylindrical body 1 having an axis C. The cutting edge line 2A of each cutting blade 2 is disposed at a first inclination angle α with respect to the axis C. The cylindrical body 1 is divided into a plurality of oblique cutting members in the direction of the axis C via mutually parallel dividing surfaces 3 having a second inclination angle β with respect to the axis C.
Therefore, a cutting blade can be formed for each of the multiple divided oblique cutting members, making it possible to provide a highly accurate rotary blade 100 at a relatively low cost.

In the rotary blade 100 of this embodiment, each cutting blade 2 is provided with a cutting tip 40 disposed along each cutting edge line 2A.
Therefore, a cutting edge tip 40 can be attached to each of the multiple divided bevel cutting members to form a cutting blade, making it possible to provide a highly accurate rotary blade 100 at a relatively low cost.

In this embodiment, the rotary blade 100 is configured with at least three types of bevel cutting members: a first bevel cutting member 10 arranged at the first end, a second bevel cutting member 20 arranged at the second end, and one or more intermediate bevel cutting members 30 arranged between the first bevel cutting member 10 and the second bevel cutting member 20.
Therefore, by increasing or decreasing the number of intermediate oblique cutting members 30, the overall length of the rotary blade 100 can be easily changed to accommodate a variety of specifications.

The rotary blade 100 of this embodiment includes a plurality of intermediate oblique cutting members 30, and the intermediate oblique cutting members 30 are set so that the dimensions in the direction of the axis C are equal to each other.
Therefore, by increasing or decreasing the number of intermediate oblique cutting members 30, the overall length of the rotary blade 100 can be easily changed to accommodate a variety of specifications.

The rotary blade 100 of this embodiment is configured so that when the intermediate bevel cutting member 30 rotates around the axis C, the rotational trajectories of the opposing first and second dividing surfaces 3A and 3B do not overlap with each other.
A large number of seams between the diagonal cutting members are arranged in the circumferential direction of the rotary blade 100. The sharpness of the seams is easily reduced, and if there are a large number of seams in the circumferential direction, poor cutting is likely to occur in the same place when the rotary blade 100 rotates around the axis C, which may adversely affect the quality of the pellets. In the present invention, the rotational trajectories of the seams do not overlap when the rotary blade 100 rotates around the axis C, so that the adverse effect on the quality of the pellets can be minimized.

The manufacturing method of the rotary blade of this embodiment is a manufacturing method of the rotary blade 100 for shearing a strand 101 formed of a pellet material in a long shape with a fixed blade 102 and a rotary blade 100 to form pellets 103. First, a processing mark 55 extending in the direction of the axis C and an axial hole 4 penetrating in the direction of the axis C are formed on the outer periphery of the cylindrical material 51. Next, the cylindrical material 51 is divided into a plurality of obliquely cut materials in the direction of the axis C by forming parallel dividing surfaces 3 having a second inclination angle β with respect to the axis C. Next, a key groove 58 is formed in the axial hole 4 of each of the obliquely cut materials. Furthermore, a plurality of cutting blades 2 arranged with a first inclination angle α with respect to the axis C are provided at regular intervals in the circumferential direction on the outer periphery of each of the obliquely cut materials to form an obliquely cut member. Then, by arranging and assembling each of the bevel cutting members in the direction of the axis C, the cutting edge lines 2A of each of the cutting blades 2 are positioned on the outer peripheral surface of the cylindrical body 1 having the axis C at the first inclination angle α with respect to the axis C.
The rotary blade 100 obtained in this manner can form a cutting blade for each of the multiple divided oblique cutting members, making it possible to provide a highly accurate rotary blade at a relatively low cost.

[Modifications]
The above describes a particularly preferred embodiment of the present invention. However, the present invention is not intended to be limited to the illustrated embodiment. The present invention can be modified and carried out in various forms. In other words, the present invention is intended to include various modified examples.
For example, in the above embodiment, the cutting blade 2 uses the cutting tip 40, but it is also possible to use a cutting blade 2 that does not use the cutting tip 40 (a so-called full blade).
In addition, the dimensions of the intermediate oblique cutting members 30 in the direction of the axis C may not be equal.

C: Axis center 1: Cylindrical body 1A: First end face 1B: Second end face 2: Cutting blade 2A: Cutting edge line 3: Divided surface 3A: First divided surface 3B: Second divided surface 4: Shaft hole 5: Shaft 6: Clamping flange 10: First beveled cutting member 11: First beveled cutting material 20: Second beveled cutting member 21: Second beveled cutting material 30: Intermediate beveled cutting member 31: Intermediate beveled cutting material 40: Cutting edge tip 41: Mounting seat 51: Cylindrical material 55: Machining mark 56: Flat surface 58: Key groove 100: Rotating blade 101: Strand 102: Fixed blade 103: Pellets

Claims (6)

The rotary blade is for shearing a strand of pellet material formed into a long shape with a fixed blade and a rotary blade to form pellets,
A cylindrical body having an axis is provided with a plurality of cutting blades arranged in a longitudinal direction at regular intervals in a circumferential direction on an outer peripheral surface thereof,
a cutting edge of each of the cutting blades is disposed at a first inclination angle with respect to the axis;
the cylindrical body is divided into a plurality of oblique cutting members in the direction of the axis via dividing surfaces that are parallel to each other and have a second inclination angle with respect to the axis. 2. The rotary blade of claim 1, wherein each of the cutting blades is provided with a cutting tip disposed along a respective cutting edge line. The rotary blade according to claim 1 or 2, wherein the plurality of oblique cutting members are configured to include at least three types of members: a first oblique cutting member arranged at a first end, a second oblique cutting member arranged at a second end, and one or more intermediate oblique cutting members arranged between the first oblique cutting member and the second oblique cutting member. The intermediate oblique cutting members are multiple,
The rotary blade according to claim 3 , wherein the intermediate oblique cutting members are set to have the same dimensions in the axial direction. 5. The rotary blade according to claim 3, wherein the intermediate bevel cutting member is configured such that, when rotated about the axis, the rotation trajectories of the two opposing divided surfaces do not overlap with each other. A method for manufacturing a rotary blade for shearing a strand of pellet material formed into a long shape with a fixed blade and a rotary blade to form pellets, comprising the steps of:
A step of forming a machining mark extending in an axial direction on an outer periphery of a cylindrical material and a shaft hole penetrating in the axial direction;
dividing the cylindrical blank into a plurality of beveled blanks in a direction of the axis by forming dividing surfaces parallel to each other and having a second inclination angle with respect to the axis;
forming a key groove in a shaft hole of each of the oblique cutting blanks;
a step of forming an oblique cutting member by providing a plurality of cutting blades arranged at a first inclination angle with respect to the axis on an outer peripheral surface of each of the oblique cutting materials at regular intervals in a circumferential direction;
and assembling the bevel cutting members in line in the axial direction so that the cutting edge lines of the cutting blades are positioned at the first inclination angle with respect to the axial center on the outer peripheral surface of a cylindrical main body having the axial center.

Images