WO2021065028A1

WO2021065028A1 - Blade and method for manufacturing blade

Info

Publication number: WO2021065028A1
Application number: PCT/JP2020/004945
Authority: WO
Inventors: 野田　和彦; 克浩土井; 博基玉野; 恭子櫻井
Original assignee: デクセリアルズ株式会社
Priority date: 2019-02-12
Filing date: 2020-02-07
Publication date: 2021-04-08
Also published as: KR102585121B1; KR20210111285A; CN113453856A; CN113453856B; JP7297627B2; JP2020131422A

Abstract

The purpose of the present invention is to provide a blade which allows for high-precision cutting, has high durability, and can be used for a long period of time. To solve the above problem, the blade according to the present invention comprises a plurality of blades 30 formed on an outer circumference of a cylindrical body 20, and is characterized by being made entirely of a free-machining alloy.

Description

Blade and blade manufacturing method

The present invention obtains a blade capable of cutting with high precision and having high durability and can be used for a long period of time, and a blade capable of cutting with high precision and having high durability and can be used for a long period of time. It relates to a method of manufacturing a blade capable of forming a blade.

A shear blade method, a gang blade method, and the like are used as a method of a device for cutting a film-like material into multiple strips. The shared blade method is a method in which the outer circumferences of two round blades are slightly intersected, and the space between the two blades is cut by shearing through a film-shaped material to be cut.
Further, as another cutting method, a score cutting method is known (see, for example, Patent Document 1). In the score cut method, a roller with a blade having a round blade on the outer circumference and a cylindrical lower roll are arranged in parallel, pressed with the material to be cut sandwiched between these two roll blades, and both rolls are rotated. , It is a method to push through the material to be cut.
Further, as another cutting method, there is a technique of using the same blade for the upper blade and the lower blade (see, for example, the cutting device described in Patent Document 2). In this method, by sandwiching the material to be cut with the cutting edge in contact or with a slight gap, even when cutting a metal plate or the like, there is no burring and high-precision cutting can be performed. ..

However, the blades used in these cutting devices have a problem that the durability of the blade is low and it is difficult to use it for a long period of time because the width of the blade edge is narrow and the angle of the blade edge is also small in order to improve the cutting accuracy. was there.

In order to improve the durability of the blade, for example, a technique of increasing the angle of the cutting edge and a technique of plating the cutting edge with a high-strength metal (see, for example, Patent Document 3) are known.
However, if the angle of the cutting edge is increased, the cutting accuracy may decrease, and with regard to the technique of plating the cutting edge with high-strength metal, the plating peels off and the durability of the blade is extended over a long period of use. It is difficult to continue using the same blade for a long period of time.

Japanese Unexamined Patent Publication No. 2003-285293 Japanese Unexamined Patent Publication No. 2001-315090 Japanese Unexamined Patent Publication No. 2000-202796

The present invention has been made in view of such circumstances, and is capable of cutting with high precision, has high durability, can be used for a long period of time, and is capable of cutting with high precision and is durable. An object of the present invention is to provide a method for manufacturing a blade that has high properties and can be used for a long period of time.

As a result of repeated studies to solve the above problems with respect to a plurality of blades formed on the outer peripheral portion of a cylindrical main body, the present inventors have improved the strength of the cutting edge by using a free-cutting alloy for the blades. We focused on the fact that it can be increased to some extent. As a result of further diligent research, the strength of the blade edge can be increased and the blade processing can be performed by forming the entire blade edge from a free-cutting alloy instead of applying alloy plating or the like to the surface of the blade edge. It has been found that the dimensional accuracy of the cutting edge is improved due to the high property, the cutting with high accuracy is possible, and the blade can be used for a long period of time.

The present invention has been made based on the above findings, and the gist thereof is as follows.
(1) A plurality of blades formed on the outer peripheral portion of a cylindrical main body, wherein the entire blade is made of a free-cutting alloy.
(2) The blade according to (1), wherein the free-cutting alloy is a nickel-phosphorus alloy.
(3) The blade according to (1) or (2), wherein the Vickers hardness of the blade is 475 or more.
(4) The blade has an average tip width of 0.005 mm or less, a blade edge angle of 30 ° or less, a variation in blade height within ± 0.001 mm, and a blade edge pitch accuracy of ± 0.001 mm or less. The blade according to any one of (1) to (3).
(5) The blade has a hook portion on the inner peripheral side of the cutting edge, and the hook portion is characterized in that the length of the blade is smaller than the height of the blade and the angle of the blade is less than 30 °. The blade according to (4).
(6) A method for manufacturing a plurality of blades formed on the outer peripheral portion of a cylindrical main body, wherein a plating layer of a free-cutting alloy is formed on a master roll base material, and the free-cutting alloy. A method for manufacturing a blade, which comprises a process of cutting a plating layer to form a blade, and the pitch of the formed blade is 0.5 mm or less.

According to the present invention, it is possible to provide a blade that can be cut with high precision, has high durability, and can be used for a long period of time. Further, according to the present invention, it is possible to provide a method for manufacturing a blade, which is capable of cutting with high accuracy, has high durability, and can be used for a long period of time.

It is a front view which shows typically one Embodiment of the blade of this invention. It is a front view which showed the part of the blade of FIG. 1 enlarged. FIG. 5 is a side view schematically showing a state of the blade embodiment of the present invention as viewed from the direction of the rotation axis of the main body. It is a flow figure for demonstrating the process about one Embodiment of the blade manufacturing method of this invention. It is a graph which showed the measurement result of the cutting edge pitch about the blade of the sample which concerns on Comparative Examples 2-4. It is a graph which showed the measurement result of the cutting edge pitch about the blade of the sample which concerns on Examples 1 to 3. It is a photograph which showed the state of the blade before and after the cutting test about the blade of the sample which concerns on Comparative Examples 2-4. It is a photograph which showed the state of the blade before and after the cutting test about the blade of the sample which concerns on Examples 1 to 3. It is the front view which showed the other embodiment of the blade of this invention by enlarging a part of the blade.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the drawings, for convenience of explanation, the dimensions of each component are shown at a ratio different from the actual dimensions.
Here, FIG. 1 schematically shows a state in which one embodiment of the blade of the present invention is viewed from the front, and FIG. 2 is a state in which a part of the blade of FIG. 1 is viewed in an enlarged manner. Is schematically shown. FIG. 3 schematically shows a state in which the blade according to the embodiment of the present invention is viewed from the direction of the rotation axis. FIG. 4 is a diagram for explaining the flow of one embodiment of the blade manufacturing method of the present invention. FIG. 9 schematically shows a state in which a part of the blade is enlarged with respect to another embodiment of the blade of the present invention.

(blade)
First, the blade of the present embodiment will be described.
As shown in FIG. 1, the blades according to the present embodiment are a plurality of blades 30 formed on the outer peripheral portion of the cylindrical main body 20.
The blade 30 according to the present embodiment is entirely made of a free-cutting alloy.
By forming not only the cutting edge and surface of the blade 30 but also the entire surface from a free-cutting alloy, the durability of the cutting edge can be greatly improved, and since the free-cutting alloy is used, the workability of the blade is high. As a result of being able to improve the dimensional accuracy of the cutting edge, it is possible to achieve both high-precision cutting and durability. Further, when the sharpness and cutting accuracy of the blade deteriorate with the passage of time, the sharpness and cutting accuracy can be improved again by reshape processing, so that the blade can be used for a long period of time.

Here, the free-cutting alloy is an alloy having excellent machinability, and examples thereof include a nickel-phosphorus alloy and a hard copper alloy. Further, among these free-cutting alloys, it is preferable to use a nickel-phosphorus alloy. This is because the strength is high, so that not only the workability of the blade but also the durability of the blade can be further improved.
The phrase "the entire blade 30 is made of a free-cutting alloy" means that all of the blade 30 (not only the surface but also the inside) is made of only a free-cutting alloy. However, even when it is made of the free-cutting alloy, it is permissible to contain unavoidable impurities. Here, the unavoidable impurities are components that are unavoidably contained at the time of manufacturing the blade 30, and the total content thereof is 1% by mass or less.

Further, the blade 30 made of the free-cutting alloy preferably has a Vickers hardness of 475 or more, more preferably 500 or more, and particularly preferably 550 or more. This is because the durability of the blade can be further enhanced by setting the Vickers hardness to 475 or more.
The Vickers hardness of the blade 30 is measured using a commercially available Vickers hardness tester.

Further, the blade 30 according to the present embodiment preferably has a height of 0.3 mm or less from the viewpoint of being able to perform high-precision cutting while maintaining the durability of the blade.
As shown in FIG. 2, the height T of the blade 30 is the length of the cutting edge protruding from the base portion 32 (base portion other than the blade) described later.

Furthermore, it is preferable that the blades 30 according to the present embodiment each have a small blade tip 30a and high dimensional accuracy from the viewpoint of enabling high-precision cutting.
Specifically, the blade 30 has an average tip width of 0.005 mm or less, a cutting edge angle of 30 ° or less, a variation in the height of the blade 30 within ± 0.001 mm, and a cutting edge pitch accuracy of ± 0.001. It is preferably within mm, the average tip width is 0.002 mm or less, the cutting edge angle is 25 ° or less, the height variation of the blade 30 is within ± 0.0005 mm, and the cutting edge pitch accuracy is within ± 0.001 mm. Is more preferable.

As shown in FIG. 2, the average tip width of the blade 30 is the width W of the tip 30a of the blade along the rotation axis direction of the main body, and the maximum tip width W of the entire circumference of each blade. The average value of all blades is taken as the tip average width.
As shown in FIG. 2, the cutting edge angle of the blade 30 is the angle α formed by the cutting edge of the blade 30.
Regarding the variation in the height of the blade, the difference between the height value X of the target blade and the height value X1 of the highest blade among the five blades arbitrarily selected, and the lowest blade It is the difference from the height value X2. Specifically, it is ± 0.001 mm that X1 is within +0.001 mm and X2 is within -0.001 mm with respect to the target height value X. expressing.
Regarding the cutting edge pitch accuracy, as shown in FIG. 1, with respect to the pitch P on which the blade 30 is formed, five blades arbitrarily selected in the width direction with respect to the target cutting edge pitch P are selected in the circumferential direction 4 It is the difference between the largest pitch P1 and the smallest pitch P2, and specifically, P1 is within +0.001 mm and P2 is within +0.001 mm with respect to the target blade edge pitch P. Within -0.001 mm is expressed as ± 0.001 mm.

Further, as shown in FIG. 9, the blade 30 preferably has a hook portion 33 on the inner peripheral side of the blade edge 34. The hog portion 33 is a part of the blade 30, has an extension angle (hog angle β) different from the cutting edge angle α, and is on the inner peripheral side (lower side in FIG. 9) of the cutting edge 34. ) Is the part located. When the blade 30 has the hook portion 33, the contact resistance to the cut product passing between the blades can be reduced.
Further, as shown in FIG. 9, it is preferable that the hog length U is smaller than the height H of the blade and the hog angle β is less than 30 °. From the point of forming the cutting edge 34, the hog length U needs to be smaller than the height H of the blade, and by setting the hog angle β to less than 30 °, the space through which the cut product passes is widened. This is because the contact resistance to the cut product can be reduced. From the same viewpoint, the hoe length U (the hoe length U / blade height H × 100%) with respect to the blade height H is more preferably 35% to 90%, more preferably 60% to 90%. It is more preferable that the hog angle β is 0 to 10 °.

The method for confirming the various dimensions of the blade 30 described above is not particularly limited, but a transfer product of the blade is obtained by dropping an ultraviolet curable resin on the surface of the blade and then irradiating it with ultraviolet rays to cure it. be able to. After that, the cured transcript can be appropriately cut out, and various dimensions can be confirmed by observing with a microscope and measuring the dimensions. This does not mean that the dimensions of the blade are directly measured, but it is simple because the shape of the intermediate product can be transferred accurately by curing the UV curable resin following the surface shape of the blade. It is effective for confirming the shape of the blade.

As described above, the blade 30 according to the present embodiment is entirely made of a free-cutting alloy, but as shown in FIG. 1, the base portion 32 on which the blade is formed is also referred to as the blade 30. Similarly, it can be composed of a free-cutting alloy. Since the blade 31 and the base portion 32 are integrated, the strength of the blade 30 can be further increased.
However, in the present invention, the formation of the base portion 32 is not particularly limited, and the blade 30 may be directly placed on the main body 20.

As shown in FIG. 1, the blade 30 according to the present embodiment is formed on the outer peripheral portion of the cylindrical main body 20 as a part of the bladed roller 10, and the object is cut.
By rotating the cylindrical main body 20 about the rotation axis C, the blade 30 according to the present embodiment is also rotated. Then, by bringing the object into contact with the rotating blade 30 according to the present embodiment, the object is cut.

The blade 30 according to this embodiment has a disk-shaped shape. FIG. 3 schematically shows a state of the blade 30 according to the present embodiment as viewed from the direction of the rotation axis. The blade 30 according to the present embodiment is not particularly limited except that it has a disk shape. For example, as shown in FIG. 3, the cutting edge can be shaped to draw an arc.

The main body 20 is not particularly limited as long as it has a cylindrical shape and the blade 30 according to the present embodiment can be formed on the outer peripheral surface.
For example, as the main body 20, a material having high strength and durability such as stainless steel, steel, a high-strength alloy, and a high-strength metal can be used.
Further, the dimensions of the main body 20 can be appropriately selected according to the type of the cutting device, the required performance, and the like.

(Blade manufacturing method)
Next, a method for manufacturing the blade according to the present embodiment will be described.
As shown in FIG. 4, the blade manufacturing method according to the present embodiment is a method for manufacturing a plurality of blades 30 formed on the outer peripheral portion of the cylindrical main body 20, and is comfortable on the master roll base material 21. A step of forming the plating layer 31 of the workable alloy (FIGS. 4A and 4B) and a step of cutting the plating layer 31 of the free-cutting alloy to form a blade 30 (FIG. 4C). , (D)), and the pitch P of the formed blade 30 is 0.5 mm or less.
By going through the above steps (FIGS. 4A to 4D), even when the forming pitch P of the blades 30 is as fine as 0.5 mm or less, the dimensional accuracy of all the blades 30 is high and high accuracy. A blade capable of cutting can be obtained. Further, since the obtained blade 30 is entirely made of a free-cutting alloy, it is easy to process, has high durability, and can be used for a long period of time.

As shown in FIGS. 4A and 4B, the method for manufacturing a blade according to the present embodiment includes a step of forming a free-cutting alloy plating layer 31 on a master roll base material 21.
By this step (FIGS. 4A and 4B), the plating layer 31 which is the base of the blade 30 can be formed.

The master roll base material 21 is a member that serves as a base for the plating layer 31, and later becomes the main body 20 of the bladed roller 10 (FIG. 4D).
The master roll base material 21 has a roll (cylindrical) shape, but can be formed by, for example, cutting or grinding the surface of the base material.

As the master roll base material 21, a known alloy such as stainless steel or high-strength carbon steel can be used as the material, and rigidity, cost, machinability, adhesion to free-cutting alloy plating, and the like can be taken into consideration. It is possible to select as appropriate.

Further, the plating layer is a base of the blade 30, and is made of a free-cutting alloy.
The plating layer is composed of only a free-cutting alloy as a composition component, but may contain unavoidable impurities.

The plating method for forming the plating layer is not particularly limited. For example, known plating methods such as electroless plating and electroplating can be appropriately used.
Examples of the free-cutting alloy of the plating layer include nickel-phosphorus alloys and hard copper alloys, and among these, nickel-phosphorus alloys are preferably used. This is because the workability of the blade and the durability of the blade can be further improved.

Further, as shown in FIGS. 4C and 4D, the blade manufacturing method according to the present embodiment includes a step of cutting the plating layer 31 of the free-cutting alloy to form the blade 30.
By this step (FIGS. 4C and 4D), the blade 30 can be formed on the master roll base material 21 (main body 20).

Although this step is not particularly limited, as shown in FIG. 4C, a step of cutting the plating layer 31 into a columnar shape (columnar processing step) and as shown in FIG. 4D, The plating layer 31 that has been machined into a columnar shape can be further cut and further divided into a step of forming a blade 30 (shape machining step).

In the columnar processing step (FIG. 4C), the surface of the formed plating layer 31 is machined so that the plating layer 31 has a columnar shape. As shown in FIG. 4B, the surface shape is not uniform only by forming the plating layer 31, and it is difficult to form the blade 30 with high dimensional accuracy as it is. Therefore, once the plating layer 31 is processed into a uniform cylindrical shape, the subsequent shape processing step (FIG. 4D) can be performed with higher accuracy.

The method of cutting the plating layer 31 in the columnar processing step (FIG. 4C) is not particularly limited as long as the plating layer 31 can be formed into a columnar shape. For example, as shown in FIG. 4C, cutting can be performed by cutting with a lathe, and an R-shaped diamond bite or the like can be used as the tip of the cutting tool 41 at that time. However, the type of the tool processing is not particularly limited, and other known tool processing can be appropriately selected.

When the surface of the cylinder is processed, if the surface of the plating layer 31 is cut too much, the surface of the master roll base material 21 is exposed or the blade becomes so thin that the blade cannot be formed from the plating layer. It is necessary to consider the thickness of the plating layer 31, the height of the formed blade 30, and the thickness of the plating layer after processing the surface of the cylinder. For example, when the height of the formed blade 30 is 0.24 mm, the plating thickness is 0.35 mm or more, and when machining the surface of a cylinder, the surface of about 0.05 mm is ground with a cutting tool to achieve a thickness of about 0.3 mm. Cylindrical processing can be performed so as to form the plating layer 31.

In the shape processing step (FIG. 4 (d)), the surface of the cylindrically processed plating layer 31 is further machined to form a plurality of target blades 30. As shown in FIG. 4D, the surface shape is not uniform only by forming the plating layer 31, and it is difficult to form the blade 30 with high dimensional accuracy as it is.

Regarding the method of cutting the plating layer 31 in the shape processing step (FIG. 4D), any method can control the blade tip width W, the blade edge angle α, the blade-to-blade pitch P, etc. with high accuracy. , There is no particular limitation. For example, shape machining can be performed by a precision cutting apparatus using a diamond tool.
As the diamond tool, for example, as shown in FIG. 4D, a tool 42 having a trapezoidal cross section and a tapered shape can be used. The taper angle of the tool 42 is preferably an angle close to the cutting edge angle from the viewpoint of improving the dimensional accuracy of the cutting edge angle of the blade 30.

Further, since the blade 30 obtained by the manufacturing method of the present embodiment is entirely made of a free-cutting alloy, if the blade edge is worn or deformed due to long-term use, the above-mentioned By performing shape processing, the cutting edge can be returned to the state before wear.

In the manufacturing method of the present embodiment, if necessary, a heat treatment step can be further carried out in order to adjust the hardness of the blade 30.
The heat treatment conditions are not particularly limited. For example, the heat treatment can be performed at 300 to 350 ° C. for 60 minutes or more.

Further, in the manufacturing method of the present embodiment, known conditions (for example, a surface treatment step of the formed blade) can be appropriately carried out in addition to the above-mentioned steps.

(Cutting device)
Next, the cutting device according to the present embodiment will be described.
The cutting device of the present embodiment has the blade of the present invention described above. By using the blade of the present invention, high-precision cutting is possible, the blade is highly durable, and it can be used for a long period of time.

The type of cutting device according to this embodiment is not particularly limited. For example, a cutting device such as a share blade method, a gang blade method, or a score cut method can be used.
Among these cutting devices, a score-cut type cutting device is preferable from the viewpoint that the effect of the blade of the present invention can be more exerted.

When the blade of the present invention is used in a score-cut type cutting device, it is preferably used as a blade of a roller with a blade, and when used in a share blade type or gang blade type cutting device, the upper blade and / Or preferably used as a lower blade.

Next, the present invention will be specifically described based on examples. However, the present invention is not limited to the following examples.

(Example 1)
Prepare a stainless master roll base material (SUS440C, diameter: 98 mm, axial length: 70 mm (blades are formed in the length range of 12 mm)), electrolessly plating the base material, and average thickness. Formed a layer of 0.35 mm nickel-phosphorus alloy. Then, the alloy layer was surface-processed into a columnar shape with an R-shaped cutting tool, and then the shape was processed using a diamond tool with a taper angle of 25 degrees to obtain a sample blade.
The number of blades obtained was 31, the average tip width was 0.002 mm, the cutting edge angle was 25 °, and the Vickers hardness was 550.

(Example 2)
After producing the blade under the same conditions as in Example 1, the blade was heat-treated at 300 ° C. for 1 hour to obtain a sample blade.
The number of blades obtained was 31, the average tip width was 0.002 mm, the cutting edge angle was 25 °, and the Vickers hardness was 900.

(Example 3)
Prepare a stainless master roll base material (SUS304, diameter: 98 mm, axial length: 70 mm (blades are formed in a length range of 4 mm)), electrolessly plating the base material, and average thickness. Formed a layer of 0.35 mm nickel-phosphorus alloy. Then, the alloy layer was surface-processed into a columnar shape with an R-shaped cutting tool, and then the shape was processed using a diamond tool with a taper angle of 25 degrees to obtain a sample blade.
The number of blades obtained was 11, the average tip width was 0.005 mm, the cutting edge angle was 25 °, and the Vickers hardness was 550.

(Example 4)
Prepare a stainless master roll base material (SUS304, diameter: 98 mm, axial length: 70 mm (blades are formed in a length range of 3 mm)), electrolessly plating the base material, and average thickness. Formed a layer of 0.35 mm nickel-phosphorus alloy. After that, the alloy layer is surface-processed into a columnar shape with an R-shaped cutting tool, and then the shape of the cutting edge is processed using a diamond tool with a taper angle of 25 degrees. Was processed to obtain a sample blade.
The number of blades obtained was 11, the average tip width was 0.002 mm, the cutting edge angle was 25 °, the hog angle was 8 °, the hog length was 0.2 mm, and the Vickers hardness was 550.

(Example 5)
Prepare a stainless master roll base material (SUS304, diameter: 98 mm, axial length: 70 mm (blades are formed in a length range of 3 mm)), electrolessly plating the base material, and average thickness. Formed a layer of 0.35 mm nickel-phosphorus alloy. After that, the alloy layer is surface-processed into a columnar shape with an R-shaped cutting tool, and then the shape of the cutting edge is processed using a diamond tool with a taper angle of 25 degrees. Was processed to obtain a sample blade.
The number of blades obtained was 11, the average tip width was 0.002 mm, the cutting edge angle was 25 °, the hog angle was 8 °, the hog length was 0.15 mm, and the Vickers hardness was 550.

(Example 6)
Prepare a stainless master roll base material (SUS304, diameter: 98 mm, axial length: 70 mm (blades are formed in a length range of 3 mm)), electrolessly plating the base material, and average thickness. Formed a layer of 0.35 mm nickel-phosphorus alloy. After that, the alloy layer is surface-processed into a columnar shape with an R-shaped cutting tool, and then the shape of the cutting edge is processed using a diamond tool with a taper angle of 25 degrees. Was processed to obtain a sample blade.
The number of blades obtained was 11, the average tip width was 0.002 mm, the cutting edge angle was 25 °, the hog angle was 8 °, the hog length was 0.1 mm, and the Vickers hardness was 550.

(Comparative Example 1)
Five metal circular blades (material: SKH51) were prepared. The distance piece (or spacer), the blade, and the distance piece were laminated in this order on the blade shaft, and assembled to the roller-shaped main body at predetermined blade intervals.
The dimensions of the blade were a circle with a diameter of 98 mm and a thickness of 0.5 mm.

(Comparative Examples 2 to 4)
Prepare a master roll base material made of copper (diameter: 98 mm, axial length: 70 mm (blade is formed in the length range of 4 mm)), and surface-process the base material into a columnar shape with an R-shaped cutting tool. After that, a diamond tool with a taper angle of 25 degrees was used to perform shape processing to obtain a sample blade.
In the sample of Comparative Example 2, the number of blades obtained was 11, the average tip width was 0.005 mm, the cutting edge angle was 25 °, and the Vickers hardness was 180.
In the sample of Comparative Example 3, the number of blades obtained was 11, the average tip width was 0.035 mm, the cutting edge angle was 25 °, and the Vickers hardness was 180.
In the sample of Comparative Example 4, the number of blades obtained was 11, the average tip width was 0.002 mm, the cutting edge angle was 25 °, and the Vickers hardness was 180.

<Evaluation>
For the samples of Examples 1 to 3 and Comparative Examples 1 to 4, the dimensional state of the blade (blade angle, blade pitch accuracy, tip average width, hardness) before use was measured using a microscope and magnified photographs. The condition was confirmed and measured. The results are shown in Table 2.
Further, for each sample of Examples and Comparative Examples, in addition to the above-mentioned measurement of the dimensional state of the blade, the following evaluations (1) and (2) were also performed.

(1) Variation in blade height For the samples of Comparative Examples 2 to 4 and Examples 1 to 3, five blades (n1 to n5) are arbitrarily selected, and an ultraviolet curable resin is dropped on the surface of the blades. After that, the height of the selected blade was observed and measured by obtaining a transfer product of the blade by irradiating it with ultraviolet rays and curing it. The measurement results are shown in Table 1.
From the results in Table 1, it was found that there was no variation in the height of the blade for each sample of the example. On the other hand, in Comparative Examples 2 to 4, it was found that a variation of about 0.004 mm occurred.

(2) Cutting edge pitch accuracy Five blades (n1 to n5) were arbitrarily selected for each sample, and the variation from the target cutting edge pitch (average cutting edge pitch in Table 2) was measured as the cutting edge pitch accuracy. The measurement results are shown in Table 2. In addition, the variation in the cutting edge pitch is measured at four positions (0 °, 90 °, 180 °, 270 °) along the circumferential direction of the blade, and the measurement results are plotted on a graph in FIG. 5 and FIG. It is shown in FIG. In Table 2, the difference between the largest pitch and the smallest pitch among all 20 data (5 blades x 4 locations in the circumferential direction) is displayed as the cutting edge pitch accuracy.
From the results of Table 2, FIG. 5 and FIG. 6, the variation in the pitch of each sample in the examples is less than half that of the variation in the pitch of the samples in Comparative Examples 2 to 4, and the cutting edge pitch accuracy is greatly improved. It turned out that.

The blades of the samples of Examples 1 to 6 and Comparative Examples 2 to 4 were assembled to a stainless steel roller (S45C, diameter 30 mm) and used as a roller with a blade in a score-cut type cutting device. For Comparative Example 1, the sample was used as a roller with a blade in a score-cut type cutting device.
Then, a PET film (Toyobo A4300, thickness: 50 μm, width: 4 mm) was cut by a score-cut type cutting device using the blade of each sample. The film was cut by the cutting device up to a length of 100 m. After cutting the film, the following evaluations (3) to (5) were performed.

(3) Whether or not the film can be cut It was visually confirmed whether or not the film could be cut up to 100 m by a cutting device using the blade of each sample.
Regarding the evaluation, ○ if 100m film cutting can be confirmed, ▲ if 100m film cutting can be confirmed but difficult to cut, × if 100m film cutting cannot be confirmed. The results are shown in Table 2. For the samples of Examples 1 to 3 and Comparative Examples 2 to 4, the state of the film after cutting was photographed and shown in FIGS. 7 and 8.

(4) Damage to the blade after cutting the film After cutting the film with a cutting device using the blade of each sample, it was observed with a microscope whether or not there was damage to the blade.
Regarding the evaluation, if there was no damage to the blade after cutting the film, it was evaluated as ◯, and if there was damage to the blade after cutting the film, it was evaluated as x, and the results are shown in Table 2. For the samples of Examples 1 to 3 and Comparative Examples 2 to 4, the state of the blade before and after cutting was photographed and shown in FIGS. 7 and 8.

(5) Film cutting accuracy After cutting the film with a cutting device using the blade of each sample, the state of the cut film was observed with a microscope.
Regarding the evaluation, in a 100 m film, when the variation in cutting width is 0.002 mm or less, it is evaluated as ◯, and when the variation in cut width exceeds 0.002 mm, it is evaluated as ×, and is shown in Table 2. For the samples of Examples 1 to 3 and Comparative Examples 2 to 4, a part of the cut film was photographed and shown in FIGS. 7 and 8.

From the results of Table 2 and FIGS. 5 to 8, when the blades of each sample of the examples were used, the dimensional accuracy of the blades before cutting the film was excellent, the durability of the blades after cutting the film was also excellent, and the film It was found that excellent results were also obtained for cutting accuracy.
On the other hand, when the blade of the sample of Comparative Example 1 was used, it was found that the dimensional accuracy of the blade before cutting and the cutting accuracy of the film were inferior. It seems that there was a problem with the accuracy when the blade was assembled to the roll, in addition to the low dimensional accuracy of the blade.
Further, when the blades of the samples of Comparative Examples 2 to 4 were used, although the dimensional accuracy before cutting was excellent, the film could not be sufficiently cut, resulting in low durability.

10 Roller with blade 20 Main body 21 Master roll base material 30 Blade 31 Plating layer 32 Base part 33 Hoe part 32 Blade tip 41 bite 42 Tool P Blade tip pitch W Blade tip width T Blade height α Blade angle β Ho Long

Claims

Multiple blades formed on the outer circumference of a cylindrical body
A blade characterized in that the entire blade is made of a free-cutting alloy.
The blade according to claim 1, wherein the free-cutting alloy is a nickel-phosphorus alloy.
The blade according to claim 1 or 2, wherein the Vickers hardness of the blade is 475 or more.
The blade is characterized in that the average tip width is 0.005 mm or less, the blade edge angle is 30 ° or less, the blade height variation is within ± 0.001 mm, and the blade edge pitch accuracy is within ± 0.001 mm. The blade according to any one of claims 1 to 3.
The blade has a hook portion on the inner peripheral side of the cutting edge.
The blade according to claim 4, wherein the hoe portion has a hoe length smaller than the height of the blade and a hoe angle of less than 30 °.
A method for manufacturing a plurality of blades formed on the outer periphery of a cylindrical main body.
The process of forming a free-cutting alloy plating layer on the master roll base material and
The process of cutting the plating layer of the free-cutting alloy to form a blade is provided.
A method for manufacturing a blade, characterized in that the pitch of the formed blade is 0.5 mm or less.