JPH01321196A - Round tool and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent any deposition of a cut material to a tool edge and wear in this edge from occurring as well as to make improvements in the cutting performance by forming a deposit generating artificial diamond coat or hard carbon coat of 0.2-20mum in thickness and less than 2s in surface roughness in at least one side of an edge side or edge periphery of a ringlike cutter. CONSTITUTION:A deposite generating artificial diamond coat 31 or hard carbon coat is formed on edge sides 17b, 19b or edge peripheries 17c, 19c of hard metal ringlike cutters 17, 19 being fitted in mutual parallel shafts by opposing their edges with each other in a thickness of 0.5-25mum by means of a chemical or physical evaporation process or the like. Next, the deposite generating diamond coat 31 or hard carbon coat themselves of these ringlike cutters are rubbed with each other, whereby surface roughness of this coat 31 is set down to less than 2s and a desired round tool is secured. In consequence, wear in the cutter edge is can be kept back and, what is more, any deposition of a cut material to the cutter edge is preventable. Consequently, cutting performance of the round tool is improvable by leaps and bounds.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to a round blade tool used for cutting sheet-like or plate-like articles such as magnetic tape, polyester film, paper, metal foil, metal plate, etc. The present invention relates to a method for manufacturing the same, and particularly to a technique for preventing an article to be cut from being welded to a blade.

"Prior Art" Conventionally, as the above-mentioned round-blade tools, those shown in FIGS. 5 and 6 are known.

This round blade tool has an upper shaft (shaft) + 3 and a lower shaft (shaft) in the device body 11! 5 are arranged parallel to each other, and an upper shaft 13 and a lower shaft 15 are arranged parallel to each other.
is a ring-shaped knife whose cutting edge is made of steel, cemented carbide, cermet, ceramic, etc.
+7 and a knife (sung-shaped cutter) 19 are provided to fit each other.

Here, the knife 17 has a cutting edge 17 as shown in FIG.
a, a cutting blade side surface 17b, and a cutting blade outer periphery 17c,
The knife I9 includes a cutting edge 19a, a cutting edge side surface 19b, and a cutting edge outer periphery 19c.

The knife 17 and the knife 19 are arranged so that the cutting edge side surface 17b and the cutting edge side surface 19b are brought into contact with each other with a predetermined pressure, and the cutting edge 17a and the cutting edge 19a are used to form a sheet such as a magnetic tape. The article 21 is cut.

"Problems to be Solved by the Invention" By the way, when cutting synthetic resin such as magnetic tape or thin copper plates with the round blade tool, the material to be cut may adhere to the blade, causing problems in cutting. There are many.

Furthermore, when cutting thin materials such as magnetic tape, the knives 17.degree. I9 are used while being in contact with each other at a predetermined contact pressure, so the cutting edges are likely to wear out. The reduction in sharpness due to the wear of the cutting edge makes it more likely that the material to be cut will adhere as described above, resulting in a significant reduction in cutting performance.

Therefore, in order to solve the above-mentioned problems, the present inventors conducted experiments as shown below for a case in which the ring-shaped cutter was made of cemented carbide and a case in which a ceramic coating was applied to the cutting edge.

First, knives 17 and 19 made of WC-Co cemented carbide.
were arranged as shown in FIG. 7, and a videotape 25 having a magnetic layer 23 formed on a polyester film 21 was arranged as shown in this figure.

Then, after cutting 500,000 meters, we observed the cross section of the cutting edge and found that it was the same knife! The cross section of the cutting edge of the knife 9 is now shown in FIG. 8, and the cross section of the cutting edge of the knife 17 is now shown in FIG.

As shown in these figures, the cutting edge wears considerably, resulting in a significant drop in cutting performance.

Next, the knife 19 located on the side where the magnetic material is applied
As shown in Fig. 1θ (a), 27 layers of 'riN layer 7 with a thickness of 1.5 μm were formed on the side surface 19b of the cutting blade, and cutting was performed under the same cutting conditions as described above. The wear in this case is shown in Figure 1O (
As shown in b), the wear on the outer circumference 19c of the cutting blade made of cemented carbide is smaller than in the case shown in Fig. 8, but the wear on the side surface of the cutting blade coated with TiN is smaller than in the case shown in Fig. 8. It got bigger. For this reason, the polishing process required for re-polishing the knife after it reaches the end of its life is rather large compared to the case shown in FIG. That is, in the case shown in FIG.
If the cutting edge is polished 2 μm radially inward from the outer peripheral surface, the cutting edge will return to normal, but in the case of FIG. 1O, the cutting edge will not return to normal unless it is polished 5 μm from the outer peripheral surface.

In this way, when ceramic coating is applied to the cutting edge, the wear of the cemented carbide itself is reduced, and cutting performance can be maintained to some extent, but
This has led to a new problem in that the re-grinding allowance has increased, and the running cost of the cutlery has therefore increased.

``Object of the Invention'' This invention was made in view of the above circumstances, and can prevent welding of new wave-cutting material to the blade and wear of the blade edge, and can significantly improve its cutting performance. Moreover, it is an object of the present invention to provide a round-blade tool that can maintain its cutting performance over a long period of time and improve its lifespan, and a method for manufacturing the same.

``Means for Solving the Problems'' This invention was made to achieve the object, and the present invention has been made in order to achieve the object. A precipitated artificial diamond coating or a hard carbon coating is formed on at least one of the outer peripheries of the blade, and the thickness of the precipitated artificial diamond coating or hard carbon coating is 0.2 to 0.2.
20 μm, and its surface roughness is 2S or less.

In addition, the method for manufacturing a round-blade tool of the present invention includes chemical treatment on the side surface or outer periphery of the cutting blade of a ring-shaped blade made of a hard alloy, which is fitted onto shafts disposed parallel to each other with their cutting edges opposed to each other. An artificial diamond coating or a hard carbon coating is deposited to a thickness of 0.5 to 2
The precipitated diamond coatings or hard carbon coatings of these ring-shaped blades are rubbed against each other so that the surface roughness of the coatings is 2S or less.

"Function" It is well known that precipitated synthetic diamonds and hard carbon coatings have extremely high hardness and excellent wear resistance, but as a result of intensive research by the present inventors, it has been discovered that these coatings are synthetically produced. It was found that this material has excellent adhesion resistance to resin and copper. In the round-edged tool of the present invention, at least one of the pair of hard metal ring-shaped cutters whose cutting edges are opposed to each other has a precipitated artificial diamond or hard diamond formed on at least one of the cutting edge side surface and the cutting edge outer periphery. The carbon coating prevents the cutting edge from wearing out and maintains its sharpness over a long period of time. Therefore, due to the synergistic effect of the sharpness of the cutting edge, which makes it difficult for the material to be cut to adhere to the cutting edge, and the excellent welding resistance of the cutting edge, it is possible to effectively prevent the material to be cut from welding to the cutting edge. Cutting performance can be dramatically improved.

However, the cutting performance can be maintained over a long period of time, and the service life can be significantly improved.

Here, the thickness of the precipitated diamond coating, etc. needs to be 0.2 μm or more in order to obtain the necessary wear resistance, and on the other hand, if the thickness of the coating goes -L from 20 μm, the coating will crack. etc., which will shorten the lifespan. Furthermore, the adhesion resistance and abrasion resistance largely depend on the surface roughness of the cutting edge. Therefore, the surface roughness of the precipitated artificial diamond coating must be 2S or less to give it a mirror-like surface.

Although it is possible to obtain such a precise surface by ordinary lapping using diamond abrasive grains, in the method for manufacturing round-edged tools of the present invention, the precipitate formed on the surface of the cutter can be By rubbing diamond or other coatings against each other, the surface of the coating can be polished by the unevenness of each other, and the unevenness can be removed. Therefore, a desired mirror surface state can be easily obtained, and since a diamond grindstone and a lap plate as consumables are not required, the manufacturing cost of the round-blade tool can be significantly reduced.

[Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. In addition, in these figures, the same reference numerals are given to the parts having the same configuration as those of the conventional example, and the explanation thereof will be omitted.

1 and 2 are diagrams schematically showing the cutting edges of a knife 17 and a knife 19 of the round-blade tool according to the present invention.

These knives 17, 19 are made of hard metal such as cemented carbide, and their actual shape is the same as that shown in FIGS. 6 and 7. Note that as the material of the knives 17 and 19, cermet or the like is appropriately selected in addition to cemented carbide.

These knives 17.19 have cutting edge sides 17b, 19.
A precipitated artificial diamond coating 31 is formed on at least one of the cutting edge outer periphery 17c and l9c. Then, this precipitated artificial diamond coating 3
The thickness of 1 is 0.2 to 20 μm, and the surface roughness is 2
It is set to 6 or less.

The precipitated artificial diamond coating 311 is formed by the following method. That is, the knife to be coated is placed in a flow of a heated reaction mixture consisting of hydrocarbon and hydrogen and activated by a thermionic radiation material, high frequency plasma discharge, microwave plasma discharge, etc. A film is formed on the surface of the diamond, avoiding precipitation and growth. The thickness of the coating in this case is 0.5 to 25 μm. Note that the hard carbon film may be formed by an ion beam method or the like.

Next, the coating of the knife on which the coating has been formed in this way may be processed to a depth of several μm (for example, lapping using diamond abrasive grains);
It is not easy to obtain such a surface roughness, and therefore, in the present invention, a mirror finish is applied to the coating as follows.

That is, the coatings deposited on the surface of the knife are brought into contact with each other with a predetermined contact pressure, and one or both are rotated while reciprocating in a direction perpendicular to the rotation axis. As a result, the surface of the film, which had irregularities of about 0.2 to 5 μm during deposition, is polished by the mutual irregularities, and the irregularities are removed to obtain a surface roughness of 28 or less. As a result, the surface of the coating becomes mirror-like.

As described above, in the present invention, an extremely precise surface can be easily obtained by rubbing the coatings against each other, and furthermore, since diamond abrasive grains and lap plates as consumables are not required, the round blade Tool manufacturing costs can be significantly reduced.

Next, FIGS. 1 and 2 show examples of locations where the precipitated artificial diamond coating 31 is formed.

FIG. 1(a) shows an example in which the precipitated artificial diamond coating 31 is formed only on the outer circumferences 17c and 19c of the cutting blade, and FIG. 1(b) shows the precipitated artificial diamond coating 3!
An example is shown in which these are formed only on the cutting edge side surfaces 17b and 19b. Moreover, FIG. 1(c) shows the precipitated artificial diamond coating 3! is the side of the cutting blade! 7b, +9b and cutting edge outer circumference 1
7c and I9c, and FIG. 1(d) shows an example in which the precipitated artificial diamond coating 31 is formed on the cutting blade side surfaces 17b and +9b and the cutting blade outer periphery 17c and I9c. Not only cutting edges 17a and 19a
An example is shown in which they are also formed on the opposite side surfaces l 7d and 19d.

In addition, Fig. 2(a) to i) is similar to Fig. 1(a) above.
It is a figure which shows the example which combined the knife shown to d) above and below.

FIG. 2(a) is a diagram showing an example in which a precipitated artificial diamond coating 3I is formed only on the outer circumference 19c of the cutting edge of the knife 19,
FIG. 2(b) is a diagram showing an example in which a precipitated artificial diamond coating 31 is formed on the cutting edge outer periphery 17c of the knife 17 and the cutting edge outer periphery 19c of the knife 19.

Further, FIG. 2(c) is a diagram showing an example in which a precipitated artificial diamond coating 31 is formed on the cutting edge side surface 17b of the knife 17 and the cutting edge outer periphery 19c of the knife 19, and FIG. A precipitated artificial diamond coating 31 is formed on the cutting blade side surface 17b and the cutting blade outer periphery 17c, and the knife 19
Artificial diamond coating 3 is also precipitated on the outer circumference 19c of the cutting edge.
FIG. 1 is a diagram showing an example in which 1 is formed.

Furthermore, FIG. 2(e) shows an artificial diamond coating 31 deposited on the cutting edge side surface 9b and the cutting edge outer periphery 19c of the knife I9.
FIG. 2 Cr) shows an example in which a precipitated artificial diamond coating 31 is formed on the cutting edge side surface 17b of the knife 17, and a precipitated artificial diamond coating 31 is also formed on the cutting edge side surface 19b and cutting edge outer periphery 19c of the knife 19. 3 is a diagram showing an example in which a diamond coating 31 is formed. FIG.

Furthermore, FIG. 2(g) shows the cutting edge side surface 17 of the knife I7.
b and artificial diamond coating 3 deposited on the cutting edge outer periphery 17c.
1, and also the cutting edge side surface 19b and cutting edge outer periphery 19c of the knife 19 are also precipitated and formed with artificial diamond coating@31.
FIG. 2(h) shows an example in which an artificial diamond coating 31 is formed by precipitation only on the side surface 19b of the cutting edge of the knife I9.
Figure 2 (i) is a side view of the cutting edge of knife I7! 7b and the cutting edge side surface 19b of the knife 19, an example in which a precipitated artificial diamond coating 31 is formed.

Note that the knives 17 and 19 facing each other may be in contact with each other or may be spaced apart from each other.

In the above-mentioned round-blade tool, at least one of the pair of knives 17 or 19 whose cutting edges are opposed to each other has a precipitated artificial diamond coating 31 formed on at least one of the side surface of the cutting blade and the outer periphery of the cutting blade. This prevents wear on the cutting edge and maintains its sharpness over a long period of time. Therefore, due to the synergistic effect of the sharpness and the difficulty in welding of the material to be cut to the cutting edge and the excellent welding resistance of the cutting edge, welding of the material to be cut to the cutting edge can be effectively prevented. Therefore, the cutting performance can be dramatically improved, and moreover, the cutting performance can be maintained for a long period of time, and the service life can be significantly improved.

In addition, by setting the surface roughness of the precipitated artificial diamond coating 31 to 2S or less to make the surface mirror-like, the lava resistance and wear resistance of the cutting edge can be further improved, thereby improving cutting performance and service life. can be further improved.

Next, we will further clarify the effects of this round-blade tool through specific experimental examples.

forming a precipitated diamond coating by the above method, and
The videotape was cut by 500,000 m with a film layer having a surface roughness of 0.5S and a thickness of 0.5 μm provided by rubbing the films against each other, and then the state of wear was measured.

FIG. 3(a) shows a case where a precipitated artificial diamond coating 31 is formed on the cutting edge outer periphery 17c, 19c, and FIG. 3(b)
When the precipitated artificial diamond coating 31 is formed on the side surfaces 17b and 19b of the cutting blade, FIG. 3(c) shows the outer periphery 1 of the cutting blade.
7c and 19c, and the cutting edge side surfaces 17b and I9b are provided with a precipitated artificial diamond coating 31. FIG.

As can be seen from these figures, the parts of the cemented carbide where the precipitated diamond coating @31 is not formed are worn, but the amount is small, especially the cutting edge part, which is the most important part during cutting. Not worn out.

Furthermore, in this experiment, no welding of the videotape to the cutting edge occurred, and no deterioration in cutting performance was observed.

Figure 4 shows a film formed using a similar method.
It is a diagram showing a cross section of the cutting edge after cutting a copper plate of O, I mn+ thickness by 500 kn+. Figure 4(a) shows the cutting edge outer circumference 17c.
, I9c t: When the Fr-produced artificial diamond coating 1 is formed, FIG. 4(b) shows the cutting edge side surface 17b,
When the precipitated artificial diamond coating 31 is formed on I 9b, FIG. 4(c) shows the outer periphery of the cutting edge! 7c.

FIG. 9 is a diagram showing the state of wear when a precipitated artificial diamond coating 31 is formed on +9c and the side surfaces 17b and l9b of the cutting blade.

In this experiment as well, only slight wear was observed in the areas where the diamond coating 31 was not formed, and there was no wear on the cutting blade or welding to the videotape cutting edge, and no deterioration in cutting performance was observed at all. .

In the above embodiment, the combination of the upper knife 17 and the lower knife 19 is shown in FIGS.
), but there is no need to limit it to this, and Figure 1 (a
All combinations of the four examples shown in ) to d) are possible.

Further, in the above embodiment, the precipitated artificial diamond coating 31 is formed on the knife 17, 19, but the same effect can be obtained by forming a hard carbon coating such as i-carbon using the same method as above. I can do it.

"Effects of the Invention" As explained above, according to the present invention, at least one of a pair of hard metal ring-shaped cutters with cutting edges facing each other has at least one of the cutting edge side surface and the cutting edge outer circumference. Forming a precipitated artificial diamond coating or hard carbon coating, and setting the thickness of the precipitated artificial diamond coating or hard carbon coating to 0.2 to 20 μm,
Since the surface roughness is 2S or less, it is possible to prevent welding of the material to be cut to the cutting edge and wear of the cutting edge. Therefore, the cutting performance can be dramatically improved, and the cutting performance can be maintained for a long time. It can be maintained for a long period of time, greatly improving its lifespan.

Furthermore, in the method for manufacturing a round-edged tool of the present invention, chemical treatment is applied to the side surface or outer periphery of the cutting edge of the ring-shaped blade made of hard alloy, which is fitted onto shafts disposed parallel to each other with their cutting edges opposed to each other. An artificial diamond coating or a hard carbon coating is deposited to a thickness of 0.5
~25 μm in diameter, and the precipitated diamond coatings of these ring-shaped cutters are rubbed against each other to achieve a surface roughness of 2S or less, making it possible to easily obtain a desired mirror surface, and furthermore, it can be used as a consumable item. Since diamond abrasive grains and lap plates are not required, the tool life can be improved and tool costs can be significantly reduced.

[Brief explanation of the drawing]

1 and 2 are views showing embodiments of the present invention, in which FIGS. 1(a) to 2(d) are cross-sectional views showing a knife on which a precipitated artificial diamond coating is formed, and FIG. Figures (a) to (i) are cross-sectional views showing the upper knife and lower knife provided with the precipitated artificial diamond coating, and Figure 3 shows the state of wear of the knife of the present invention when cutting video film. 4(a) to c
) is a cross-sectional view showing the state of wear of the knife of the present invention when cutting a copper plate, FIG. 5 is a front view showing a conventional round-blade tool, and FIG. 6 is an enlarged view of the portion marked with an arrow ■ in FIG. Further, FIG. 7 is a cross-sectional view showing a state in which a video film is cut with a conventional round-blade tool, and FIG. 8 is a diagram showing a worn state of the lower knife after cutting a video film.
a) is a cross-sectional view of the cutting edge, and FIG. 8(b) is a cross-sectional view of the cutting edge.
a) An enlarged view of the middle arrow ■ part, FIG. 9 is a diagram showing the state of wear of the upper knife after cutting the video film, and FIG.
Figure (a) is a cross-sectional view of the cutting edge, and Figure 9 (b) is a cross-sectional view of the cutting edge.
Fig. 10 (a) is an enlarged view of the part indicated by the middle arrow ■, and Fig. 1θ shows the state of wear of a knife whose cutting edge is coated with TiN. 1
0(b) is an enlarged view of the portion indicated by the arrow X in FIG. 1(a). 13... Upper shaft (shaft), I5...
...Lower shaft (shaft)! 7... Knife (ring-shaped cutter), +7b... Cutting blade side surface, 17c... Cutting blade outer periphery, 19... Knife (ring-shaped cutter), 19b...
... Cutting blade side surface, 19c ... Cutting blade outer periphery, 31 ... Precipitated artificial diamond coating.

Claims (2)

[Claims] (1) In a round-blade tool in which a hard metal ring-shaped cutter is fitted onto a shaft disposed parallel to each other, at least one of the pair of ring-shaped cutters with cutting edges facing each other is cut. A precipitated artificial diamond coating or a hard carbon coating is formed on at least one of the blade side surface and the cutting edge outer periphery, and the thickness of the precipitated diamond coating or hard carbon coating is 0.2 to 20 μm,
A round blade tool characterized in that the surface roughness of the coating is set to 2S or less. (2) Precipitation is formed by chemical or physical vapor deposition on the side surface or outer periphery of the cutting edge of a hard metal ring-shaped cutter that is fitted onto parallel shafts with their cutting edges opposing each other. Forming an artificial diamond coating or a hard carbon coating with a thickness of 0.5 to 25 μm, and rubbing the precipitated diamond coatings or hard carbon coatings of these ring-shaped blades against each other to make the surface roughness of the coating 2S or less. Features: A manufacturing method for round-blade tools.