JP2022061524A - Rotary blade and method for manufacturing the same - Google Patents

Abstract

To provide a high-precision rotary blade at a relatively low cost.SOLUTION: A rotary blade 100 shears a strand 101 of a pellet material between itself and a stationary blade 102 to make pellets 103. Cutting blades 2 placed in a longitudinal direction are provided on an outer circumferential surface of a cylindrical body 1 having an axis C at regular intervals in a circumferential direction. A blade edge line 2A of each of the cutting blades 2 is arranged with a first inclination angle α with respect to the axis C. The cylindrical body 1 is divided into a plurality of diagonally cut members in a direction of the axis C via dividing surfaces 3 parallel to each other having a second inclination angle β with respect to the axis C. A cutting blade can be formed for each of the diagonally cut members divided into a plurality of pieces, which can provide the high-precision rotary blade 100 at a relatively low cost, and correspond to size enlargement. If the rotation trajectories of the seams do not overlap when the rotary blade rotates about the axis, the adverse effect on the pellet quality can be minimized.SELECTED DRAWING: Figure 1

Description

The present invention relates to the above-mentioned rotary blade and a method for manufacturing the same, for shearing a strand in which a pellet material is formed into a long shape with a fixed blade and a rotary blade into pellets.

As a pellet manufacturing machine for manufacturing pellets of resin or the like, for example, as shown in Patent Document 1 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. In the rotary blade of Patent Document 1, a helical blade is provided over the entire length of the rotary blade.

Japanese Patent No. 5336548

However, since the helical blade is provided in a spiral shape, it is necessary to form the cutting blade itself in a spiral shape, which is difficult to process and manufacture, high in cost, and difficult to improve accuracy. Further, since the cutting blade is generally attached to the rotary blade by brazing, the spiral cutting blade must be brazed to the spiral base. Spiral cutting edges are extremely expensive and costly, difficult to install and difficult to improve accuracy.

In view of such circumstances, the present invention has been made for the purpose of providing a rotary blade having high accuracy at a relatively low cost and a method for manufacturing the rotary blade.

The rotary blade according to claim 1 adopts the following configuration in order to achieve the above object.
The above-mentioned rotary blade for shearing a strand in which a pellet material is formed into a long shape with a fixed blade and a rotary blade to form a pellet.
A plurality of cutting blades existing in the longitudinal direction are provided at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical body having an axial center.
The cutting edge line of each of the above cutting blades is arranged with a first inclination angle with respect to the above axis.
The cylindrical main body is divided into a plurality of oblique cutting members in the direction of the axial center via a dividing surface parallel to each other having a second inclination angle with respect to the axial center.

The rotary blade according to claim 2 adopts the following configuration in addition to the configuration according to claim 1.
Each of the above cutting blades is attached with a cutting edge tip arranged along the respective cutting edge line.

The rotary blade according to claim 3 adopts the following configuration in addition to the configuration according to claim 1 or 2.
The plurality of diagonal cutting members include a first diagonal cutting member arranged at the first end portion, a second diagonal cutting member arranged at the second end portion, and the first diagonal cutting member and the second diagonal cutting member. It is configured to include at least three types of one or more intermediate diagonal cutting members arranged between the two.

The rotary blade according to claim 4 adopts the following configuration in addition to the configuration according to claim 3.
There are a plurality of intermediate diagonal cutting members,
The plurality of intermediate diagonal cutting members are set so that the dimensions in the axial direction are equal to each other.

The rotary blade according to claim 5 adopts the following configuration in addition to the configuration according to claim 3 or 4.
The intermediate diagonal cutting member is configured so that the rotation loci of the two opposing split surfaces do not overlap each other when rotated about the axis.

The method for manufacturing a rotary blade according to claim 6 adopts the following configuration in order to achieve the above object.
The above-mentioned method for manufacturing a rotary blade, in which a strand in which a pellet material is formed into a long shape is sheared with a fixed blade and a rotary blade to form pellets.
A process of forming a processing mark extending in the axial direction and a shaft hole penetrating the axial direction on the outer circumference of the cylindrical material.
A step of forming the cylindrical material into a plurality of diagonally cut materials in the direction of the axial center by forming parallel dividing surfaces having a second inclination angle with respect to the axial center.
The process of forming a keyway in the shaft hole of each diagonal cutting material and
A step of forming a diagonal cutting member by providing a plurality of cutting blades arranged at a first inclination angle with respect to the axial center on the outer peripheral surface of each diagonal cutting material at regular intervals in the circumferential direction.
By assembling the diagonal cutting members side by side in the axial direction, the cutting edge line of each cutting blade has the first inclination angle with respect to the axial center on the outer peripheral surface of the cylindrical main body having the axial center. It was provided with a process to be arranged.

The rotary blade according to claim 1 is the rotary blade for shearing a strand in which a pellet material is formed into a long shape with a fixed blade and a rotary blade to form pellets. The rotary blade is provided with a plurality of cutting blades existing in the longitudinal direction at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical main body having an axial center. The cutting edge line of each of the cutting blades is arranged with a first inclination angle with respect to the axial center. The cylindrical main body is divided into a plurality of oblique cutting members in the direction of the axial center via a dividing surface parallel to each other having a second inclination angle with respect to the axial center.
Therefore, since the cutting edge can be formed for each of the oblique cutting members divided into a plurality of pieces, it is possible to provide a rotary blade with high accuracy at a relatively low cost.

The rotary blade according to claim 2 has a cutting edge tip arranged along the cutting edge line of each cutting blade.
Therefore, it is possible to form a cutting edge by attaching a cutting edge tip to each of the diagonally divided diagonal cutting members, and it is possible to provide a rotary blade with high accuracy at a relatively low cost.

In the rotary blade according to claim 3, the plurality of diagonal cutting members are the first diagonal cutting member arranged at the first end portion, the second diagonal cutting member arranged at the second end portion, and the first diagonal cutting member. It is configured to include at least three types of one or more intermediate diagonal cutting members arranged between the diagonal cutting member and the second diagonal cutting member.
Therefore, by increasing or decreasing the number of intermediate diagonal cutting members, the total length of the rotary blade can be easily changed to meet various specifications.

The rotary blade according to claim 4 has a plurality of intermediate diagonal cutting members, and the plurality of intermediate diagonal cutting members are set so that the dimensions in the axial direction are equal to each other.
Therefore, by increasing or decreasing the number of intermediate diagonal cutting members, the total length of the rotary blade can be easily changed to meet various specifications.

The rotary blade according to claim 5 is configured such that when the intermediate diagonal cutting member rotates about the axis, the rotation trajectories of the two opposing split surfaces do not overlap each other.
A large number of seams between the diagonal cutting members are lined up in the circumferential direction of the rotary blade. The sharpness of the seams tends to decrease, and if there are many seams in the circumferential direction, cutting defects are likely to occur at the same location when the rotary blade rotates around the axis, which may adversely affect the quality of the pellets. be. In the present invention, when the rotary blade rotates about the axis, the rotation trajectories of the seams do not overlap, so that the adverse effect on the quality of the pellets can be minimized.

The method for manufacturing a rotary blade according to claim 6 is the above-mentioned method for manufacturing a rotary blade for shearing a strand in which a pellet material is formed into a long shape with a fixed blade and a rotary blade to form pellets. First, on the cylindrical material, a processing mark extending in the axial direction and a shaft hole penetrating in the axial direction are formed on the outer periphery. Then, the cylindrical material is divided into a plurality of diagonally cut materials in the direction of the axial center by forming a dividing surface parallel to each other having a second inclination angle with respect to the axial center. Next, a keyway is formed in the shaft hole of each of the diagonal cutting materials. Further, a plurality of cutting blades arranged at a first inclination angle with respect to the axial center are provided on the outer peripheral surface of each diagonal cutting material at regular intervals in the circumferential direction to form a diagonal cutting member. After that, by assembling the diagonal cutting members side by side in the axial direction, the cutting edge line of each cutting blade is the first one with respect to the axial center on the outer peripheral surface of the cylindrical main body having the axial center. Arrange with an inclination angle.
Since the rotary blade thus obtained can form a cutting blade for each of a plurality of oblique cutting members, it is possible to provide a highly accurate rotary blade at a relatively low cost.

It is a figure explaining one Embodiment of the rotary blade of this invention. It is a figure explaining the 1st diagonal cutting member. It is a figure explaining the 2nd diagonal cutting member. It is a figure explaining the intermediate diagonal cutting member. It is a figure explaining the cutting blade. It is an embodiment of the manufacturing method of the rotary blade of this invention, and is the figure explaining the cylindrical material. It is a figure explaining the process of forming a processing mark and a shaft hole in the said cylindrical material. It is a figure explaining the process of dividing the said cylindrical material into a plurality of diagonally cut materials. It is a diagonal cutting material obtained by the above-mentioned dividing step, (A) is a first diagonal cutting material, (B) is a second diagonal cutting material, and (C) is an intermediate diagonal cutting material. It is a figure explaining the process of providing the cutting blade in each diagonal cutting material and making it into a diagonal cutting member. It is a figure explaining the process of forming a mounting seat of a cutting edge tip. It is a figure explaining the process of mounting and polishing a cutting edge tip. It is a figure explaining an example of the use state of the rotary blade of this embodiment.

Next, embodiments of the present invention will be described in detail.

1 to 5 are views showing an embodiment of the rotary blade of the present invention. Further, FIG. 13 is a diagram illustrating an example of a usage state of the rotary blade.

As shown in FIG. 13, the rotary blade 100 of the present embodiment is used in a shearing device that shears a strand 101 in which a pellet material is formed into a long shape with a fixed blade 102 and a rotary blade 100 to form a pellet 103. The blade is 100.

[Overall structure]
FIG. 1 is a diagram 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 is provided with a plurality of cutting blades 2 existing in the longitudinal direction at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical main body 1 having the axis C. Therefore, the cutting blades 2 are provided on the outer peripheral surface of the cylindrical main body 1 over the entire length in the longitudinal direction, and are arranged at a constant pitch over the entire circumference in the circumferential direction.

The cutting edge line 2A of each cutting blade 2 is arranged with a first inclination angle α with respect to the axial center C. The first inclination angle α can be set to, for example, about 2 ° to 15 °. The cutting edge line 2A is further preferably formed in a spiral shape in the longitudinal direction.

The cylindrical main body 1 is divided into a plurality of oblique cutting members in the direction of the axis C via a dividing surface 3 parallel to each other 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 plurality of diagonal cutting members include a first diagonal cutting member 10 arranged at the first end portion, a second diagonal cutting member 20 arranged at the second end portion, and the first diagonal cutting member. It comprises at least three types of one or more intermediate diagonal cutting members 30 arranged between the 10 and the second diagonal cutting member 20.

Further, in this example, the number of the intermediate diagonal cutting members 30 is a plurality (five in the illustrated example). Further, the plurality of intermediate diagonal cutting members 30 are set so that the dimensions in the axial center C direction are equal to each other. In the illustrated example, the first oblique cutting member 10 is arranged at the first end portion, the second oblique cutting member 20 is arranged at the second end portion, and the first oblique cutting member 10 and the second oblique cutting member 10 are arranged. Five intermediate diagonal cutting members 30 are arranged between the cutting members 20.

The first diagonal cutting member 10, the second diagonal cutting member 20, and the intermediate diagonal cutting member 30 are each formed with a shaft hole 4 coaxial with the axis C and penetrating in the direction of the axis C. .. The shaft holes 4 of the first diagonal cutting member 10, the second diagonal cutting member 20, and the intermediate diagonal cutting member 30 have the same diameter, and a shaft 5 for axially supporting the rotary blade 100 is inserted. ing.

The cylindrical main body 1 is formed by the first diagonal cutting member 10, the second diagonal cutting member 20, and the intermediate diagonal cutting member 30 in which the shaft 5 is inserted and arranged side by side. Tightening flanges 6 are attached to portions of the shaft 5 near both ends so as to fasten both ends of the first end and the second end of the cylindrical body 1. The tightening flange 6 can be tightened with bolts (not shown) or the like, or the shaft 5 can be threaded and tightened by screwing.

[First diagonal cutting member 10]
2A and 2B are views showing the first diagonal cutting member 10, where FIG. 2A is a front view and FIG. 2B is a right side view.

The first diagonal cutting member 10 is arranged at the first end portion. In this example, it is the left end when viewed from the front. The first diagonal cutting member 10 is provided with the above-mentioned cutting blade 2 on the outer peripheral surface thereof, and is provided with the above-mentioned shaft hole 4 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 a second split surface 3B inclined with a second inclination angle β with respect to the axis C.

[Second diagonal cutting member 20]
3A and 3B are views showing the second diagonal cutting member 20, where FIG. 3A is a front view and FIG. 3B is a right side view.

The second diagonal cutting member 20 is arranged at a second end located on the opposite side of the first end. In this example, it is the right end when viewed from the front. The second diagonal cutting member 20 is provided with the above-mentioned cutting blade 2 on the outer peripheral surface thereof, and is provided with the above-mentioned shaft hole 4 coaxially with the axis C. The side surface on the first end side (left side in the figure) is a first division surface 3A inclined with 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 diagonal cutting member 30]
4A and 4B are views showing the intermediate diagonal cutting member 30, where FIG. 4A is a front view and FIG. 4B is a right side view.

Five intermediate diagonal cutting members 30 are arranged between the first diagonal cutting member 10 and the second diagonal cutting member 20. The intermediate diagonal cutting member 30 is provided with the above-mentioned cutting blade 2 on the outer peripheral surface thereof, and is provided with the above-mentioned shaft hole 4 coaxially with the axis C. The side surface on the first end side (left side in the figure) is a first division surface 3A inclined with 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 a second split surface 3B inclined with a second inclination angle β with respect to the axis C.

[Cut blade 2]
FIG. 5 is a diagram illustrating the details of the cutting blade 2. In the figure, the intermediate diagonal cutting member 30 has been described, but the same applies to the first diagonal cutting member 10 and the second diagonal cutting member 20.
Each of the cutting blades 2 is attached with a cutting edge tip 40 arranged along the respective cutting edge line 2A. A mounting seat 41 for mounting the cutting edge tip 40 is notched in the cutting blade 2, and the cutting edge tip 40 is attached to the mounting seat 41 by, for example, brazing.

As the material of the cutting edge tip 40, for example, cemented carbide, cermet, high-speed tool steel, or the like can be used.

[Divided surface 3]
In the overall structure of FIG. 1, the first diagonal cutting member 10 is arranged at the first end portion, the second diagonal cutting member 20 is arranged at the second end portion, and the first diagonal cutting member 10 and the second diagonal cutting member 10 are arranged. Five intermediate diagonal cutting members 30 are arranged between the cutting members 20. At this time, in the above-mentioned divided surface 3, the first divided surface 3A on the first end side and the second divided surface 3A on the second end side face each other, and the first divided surface 3A and the first divided surface 3A are facing each other. It is configured by the two divided surfaces 3B being in close contact with each other.

The intermediate diagonal cutting member 30 is configured so that the rotation trajectories of the two opposing first division surfaces 3A and the second division surface 3B do not overlap each other when rotated about the axis C. ing. The diameter of the cylindrical member 1, the second inclination angle β, and the dimensions of the intermediate diagonal cutting member 30 in the axial center C direction are set so as to have such a configuration.

〔Production method〕
6 to 13 are views showing an embodiment of the method for manufacturing the rotary blade 100 of the present invention.
This embodiment is a method for manufacturing the rotary blade 101 for shearing a strand 101 in which a pellet material is formed into a long shape with a fixed blade 102 and a rotary blade 100 to form a pellet 103.

FIG. 6 is a diagram showing a cylindrical material 51. (A) is a front view, and (B) is a left side view.
The cylindrical material 51 is a cylindrical material in this example. As the material of the cylindrical material 51, various types of carbon steel for machine structure, alloy steel for machine structure, non-rust steel and the like can be used. For example, alloy tool steel, various stainless steels, etc.

FIG. 7 is a diagram illustrating a process of forming a processing mark and a shaft hole in the cylindrical material. (A) is a front view, and (B) is a left side view.
It is assumed that the outer peripheral surface and both end surfaces of the cylindrical material 51 are dimensioned by rough cutting and have an axial center C. With respect to the cylindrical material 51 after the rough cutting process, a processing mark 55 extending in the axial center C direction and a shaft hole 4 penetrating in the axial center C direction are formed on the outer periphery. In the illustrated example, the processing mark 55 is a groove extending in the axial C direction on the outer peripheral surface. The processing mark 55 is provided over the entire length of the cylindrical material 51. Further, it is preferable to form a flat surface portion 56 in advance on the outer peripheral surface located on the opposite side of the processing mark 55 in order to facilitate the groove processing and the post-processing.

FIG. 8 is a diagram illustrating a step of dividing the cylindrical material 51 into a plurality of diagonally cut materials. (A) is a front view, and (B) is a left side view.
The cylindrical material 55 forms a parallel dividing surface 3 having a second inclination angle β with respect to the axis C, and is divided into a plurality of diagonal cutting materials in the direction of the axis C. This dividing step can be performed using, for example, a saw board or the like.

FIG. 9 is a diagonal cutting material obtained by the above-mentioned dividing step. (A-1) (A-2) is the first diagonal cutting material 11, (B-1) (B-2) is the second diagonal cutting material 21, and (C-1) (C-2) is the intermediate diagonal cutting material. Material 31.

Next, a key groove 58 is formed in the shaft hole 4 of each of the diagonal cutting materials. The key groove 58 fits a key (not shown) in a space matched with a key groove (not shown) provided on the shaft 5, and transmits the rotational power of the shaft 5 to each diagonal cutting material.

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

The first diagonal cutting material 11 becomes the above-mentioned first diagonal cutting member 10 by processing described later. A key groove 58 is formed on the inner surface of the shaft hole 4 of the first diagonal cutting material 11. The keyway 58 is formed so as to extend along the axis C. At the time of 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 as to be arranged on the same line as the axis C and the processing mark 55.

The first diagonal cutting material 11 has a first end surface 1A whose side surface on the first end side (left side in the drawing) is perpendicular to the axis C. The side surface on the second end side (right side in the figure) is a second split surface 3B inclined with a second inclination angle β with respect to the axis C.

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

The second diagonal cutting material 21 becomes the above-mentioned second diagonal cutting member 20 by the processing described later. A key groove 58 is formed on the inner surface of the shaft hole 4 of the second diagonal cutting material 21 in the same manner as the first diagonal cutting material 11.

In the second diagonal cutting material 21, the side surface on the first end side (left side in the drawing) is a first divided surface 3A inclined with a second inclination angle β with respect to the axial center 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 diagonal cutting material 31]
In FIG. 9, (C-1) is a front view of the intermediate diagonal cutting material 31, and (C-2) is a left side view.

The intermediate diagonal cutting material 31 becomes the above-mentioned intermediate diagonal cutting member 30 by the processing described later. A key groove 58 is formed on the inner surface of the shaft hole 4 of the intermediate diagonal cutting material 21 in the same manner as the first diagonal cutting material 11 and the second diagonal cutting material 21.

In the intermediate diagonal cutting material 31, the side surface on the first end side (left side in the drawing) is a first divided surface 3A inclined with a second inclination angle β with respect to the axial center C. The side surface on the second end side (right side in the figure) is a second split surface 3B inclined with a second inclination angle β with respect to the axis C.

FIG. 10 is a diagram illustrating a process of providing a cutting blade 2 on each of the diagonal cutting materials to form a diagonal cutting member. (A-1) and (A-2) are the first diagonal cutting member 10, (B-1) and (B-2) are the second diagonal cutting member 20, and (C-1) and (C-2) are intermediate diagonal cutting members. It is a member 30.

In this step, a plurality of cutting blades 2 arranged at a first inclination angle α with respect to the axis C are provided on the outer peripheral surface of each oblique cutting material at regular intervals in the circumferential direction to provide an oblique cutting member. Form.

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

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

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

FIG. 11 is a diagram illustrating a process of forming a mounting seat 41 of the cutting edge tip 40. In the figure, the intermediate diagonal cutting member 30 has been described, but the same applies to the first diagonal cutting member 10 and the second diagonal cutting member 20.
The mounting seat 41 is formed by making a notch in the front portion of each cutting blade 2 in the rotation direction (arrow in the figure).

FIG. 12 is a diagram illustrating a process of mounting and polishing the cutting edge tip 40. (A) is a mounting process, and (B) is a polishing process. In the figure, the intermediate diagonal cutting member 30 has been described, but the same applies to the first diagonal cutting member 10 and the second diagonal cutting member 20.
As shown in FIG. 12A, the cutting edge tip 40 is attached to the mounting seat 41 of each of the cutting blades 2. This attachment can be done, for example, by brazing.
As shown in FIG. 12B, both sides of the attached cutting edge tip 40 are polished so as to be flush with the first divided surface 3A and the second divided surface 3B. Similarly, in the case of the first oblique cutting member 10, the cutting edge tip 40 is polished so as to be flush with the first end surface 1A and the second divided surface 3B. In the case of the second diagonal cutting member 20, the cutting edge tip 40 is polished so as to be flush with the second end surface 1B and the first dividing surface 3A.

After that, the cutting edge tip 40 can be polished and finished into the shape shown in FIG. 5, for example.

Then, a step of arranging and assembling the diagonally cut members side by side in the direction of the axis C is performed. As a result, on the outer peripheral surface of the cylindrical main body 1 having the axis C, the cutting edge line 2A of each cutting blade 2 is arranged with the first inclination angle α with respect to the axis C (the first inclination angle α). See Figure 1).

The above embodiment has the following effects.

The rotary blade 100 of the present embodiment is the rotary blade 100 for shearing a strand 101 in which a pellet material is formed into a long shape with a fixed blade 102 and a rotary blade 100 to form a pellet 103. The rotary blade 100 is provided with a plurality of cutting blades 2 existing in the longitudinal direction at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical main body 1 having the axis C. The cutting edge line 2A of each cutting blade 2 is arranged with a first inclination angle α with respect to the axial center C. Then, the cylindrical main body 1 is divided into a plurality of oblique cutting members in the direction of the axis C via a dividing surface 3 parallel to each other having a second inclination angle β with respect to the axis C. There is.
Therefore, since the cutting edge can be formed for each of the diagonally divided members, it is possible to provide the rotary blade 100 with high accuracy at a relatively low cost.

In the rotary blade 100 of the present embodiment, each of the cutting blades 2 is attached with a cutting edge tip 40 arranged along the respective cutting edge line 2A.
Therefore, the cutting edge tip 40 can be attached to each of the diagonally divided diagonal cutting members to form a cutting edge, and the rotary blade 100 with high accuracy can be provided at a relatively low cost.

In the rotary blade 100 of the present embodiment, the plurality of diagonal cutting members are the first diagonal cutting member 10 arranged at the first end portion, the second diagonal cutting member 20 arranged at the second end portion, and the above. It is configured to include at least three types of one or more intermediate diagonal cutting members 30 arranged between the first diagonal cutting member 10 and the second diagonal cutting member 20.
Therefore, by increasing or decreasing the number of the intermediate diagonal cutting members 30, the total length of the rotary blade 100 can be easily changed to meet various specifications.

The rotary blade 100 of the present embodiment has a plurality of intermediate diagonal cutting members 30, and the plurality of intermediate diagonal cutting members 30 are set so that the dimensions in the axial center C direction are equal to each other.
Therefore, by increasing or decreasing the number of the intermediate diagonal cutting members 30, the total length of the rotary blade 100 can be easily changed to meet various specifications.

In the rotary blade 100 of the present embodiment, when the intermediate diagonal cutting member 30 rotates about the axis C, the rotation trajectories of the first division surface 3A and the second division surface 3B facing each other are mutual. It is configured so that it does not overlap.
A large number of seams between the diagonal cutting members are lined up in the circumferential direction of the rotary blade 100. The sharpness of the seams tends to decrease, and if there are many seams in the circumferential direction, when the rotary blade 100 rotates about the axis C, cutting defects are likely to occur at the same place, which adversely affects the quality of the pellets. There is a risk. In the present invention, when the rotary blade 100 rotates about the axis C, the rotation trajectories of the seams do not overlap, so that the adverse effect on the quality of the pellets can be minimized.

The method for manufacturing a rotary blade of the present embodiment is the method for manufacturing the rotary blade 100 for shearing a strand 101 in which a pellet material is formed into a long shape with a fixed blade 102 and a rotary blade 100 to form a pellet 103. .. First, on the outer circumference of the cylindrical material 51, a processing mark 55 extending in the axial center C direction and a shaft hole 4 penetrating in the axial center C direction are formed. Then, the cylindrical material 51 is divided into a plurality of oblique cutting materials in the direction of the axis C by forming a dividing surface 3 parallel to each other having a second inclination angle β with respect to the axis C. .. Next, a key groove 58 is formed in the shaft hole 4 of each of the diagonal cutting materials. Further, a plurality of cutting blades 2 arranged at a first inclination angle α with respect to the axis C are provided on the outer peripheral surface of each diagonal cutting material at regular intervals in the circumferential direction to form a diagonal cutting member. .. After that, by assembling the diagonal cutting members side by side in the direction of the axis C, the cutting edge line 2A of each cutting blade 2 becomes the axis C on the outer peripheral surface of the cylindrical main body 1 having the axis C. On the other hand, it is arranged with the first inclination angle α.
Since the rotary blade 100 thus obtained can form a cutting blade for each of a plurality of oblique cutting members, it is possible to provide a rotary blade with high accuracy at a relatively low cost.

[Modification example]
The above has described a particularly preferable embodiment of the present invention. However, the present invention is not limited to the illustrated embodiment. The present invention can be implemented by transforming it into various aspects. That is, the present invention is intended to include various modifications.
For example, in the above embodiment, the cutting edge tip 40 is used for the cutting edge 2, but it is also possible to use a cutting edge 2 (so-called total blade) that does not use the cutting edge tip 40.
Further, the dimensions of the intermediate diagonal cutting member 30 in the direction of the axis C are intended to include those that are not equal.

C: Axial center 1: Cylindrical body 1A: First end surface 1B: Second end surface 2: Cutting blade 2A: Cutting edge line 3: Divided surface 3A: First divided surface 3B: Second divided surface 4: Shaft Hole 5: Shaft 6: Tightening flange 10: First diagonal cutting member 11: First diagonal cutting material 20: Second diagonal cutting member 21: Second diagonal cutting material 30: Intermediate diagonal cutting member 31: Intermediate diagonal cutting material 40 : Cutting edge tip 41: Mounting seat 51: Cylindrical material 55: Processing mark 56: Flat surface portion 58: Key groove 100: Rotary blade 101: Strand 102: Fixed blade 103: Pellet

Claims (6)

The above-mentioned rotary blade for shearing a strand in which a pellet material is formed into a long shape with a fixed blade and a rotary blade to form a pellet.
A plurality of cutting blades existing in the longitudinal direction are provided at regular intervals in the circumferential direction on the outer peripheral surface of the cylindrical body having an axial center.
The cutting edge line of each of the above cutting blades is arranged with a first inclination angle with respect to the above axis.
The cylindrical main body is divided into a plurality of oblique cutting members in the direction of the axial center via a dividing surface parallel to each other having a second inclination angle with respect to the axial center. blade. The rotary blade according to claim 1, wherein each of the above cutting blades is attached with a cutting edge tip arranged along the respective cutting edge lines. The plurality of diagonal cutting members include a first diagonal cutting member arranged at the first end portion, a second diagonal cutting member arranged at the second end portion, and the first diagonal cutting member and the second diagonal cutting member. The rotary blade according to claim 1 or 2, wherein the rotary blade is configured to include at least three types of one or more intermediate diagonal cutting members arranged between the blades. There are a plurality of intermediate diagonal cutting members,
The rotary blade according to claim 3, wherein the plurality of intermediate diagonal cutting members are set so that the dimensions in the axial direction are equal to each other. The rotary blade according to claim 3 or 4, wherein the intermediate diagonal cutting member is configured so that the rotation loci of two opposing split surfaces do not overlap each other when rotated about the axis. The above-mentioned method for manufacturing a rotary blade, in which a strand in which a pellet material is formed into a long shape is sheared with a fixed blade and a rotary blade to form pellets.
A process of forming a processing mark extending in the axial direction and a shaft hole penetrating the axial direction on the outer circumference of the cylindrical material.
A step of forming the cylindrical material into a plurality of diagonally cut materials in the direction of the axial center by forming parallel dividing surfaces having a second inclination angle with respect to the axial center.
The process of forming a keyway in the shaft hole of each diagonal cutting material and
A step of forming a diagonal cutting member by providing a plurality of cutting blades arranged at a first inclination angle with respect to the axial center on the outer peripheral surface of each diagonal cutting material at regular intervals in the circumferential direction.
By assembling the diagonal cutting members side by side in the axial direction, the cutting edge line of each cutting blade has the first inclination angle with respect to the axial center on the outer peripheral surface of the cylindrical main body having the axial center. A method of manufacturing a rotary blade, which comprises a process of arranging the blade.

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