JP4127666B2 - Slitter cutting blade and slitting tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slitting blade and a slitting tool for continuously cutting a long sheet-shaped workpiece such as a resin film, paper, metal foil, and metal thin plate.
[0002]
[Prior art]
Conventionally, for slitting a slitting blade or a ceramic green sheet as shown in FIG. 1 for continuously cutting a long sheet-like workpiece such as a resin film, magnetic tape, paper, metal foil, and metal thin plate. As such cutting blades and the like, many cutting blades are used in which a cutting edge surface of a hard alloy such as cemented carbide is coated with a coating film. For example, Patent Documents 1 and 2 describe that the surface of a cutting blade made of cemented carbide or the like is coated with diamond-like carbon (DLC) having a thickness of 1 to 2 μm by a vapor deposition method, thereby extending the life.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-72224
[Patent Document 2]
JP-A-10-146714 [0005]
[Problems to be solved by the invention]
However, in a cutting blade coated with diamond-like carbon (DLC) having a film thickness of 1 to 2 μm by the vapor deposition method described in Patent Documents 1 and 2, the coating 20 is concentrated on the cutting edge 21 as shown in FIG. As a result, the sharpness of the cutting edge is impaired and the sharpness is deteriorated, particularly in the case of cutting a soft and thin material to be cut. Occurs, the cut surface is broken instead of being cut, and part of the material to be cut off falls apart (separately). In some cases, a heavy load is applied to the cutting blade and the life is shortened. There was a fear.
[0006]
Therefore, when the thickness of the DLC film is simply reduced, there is a problem that the DLC film is worn away at an early stage due to friction between the blade edges during slitting, and the life of the cutting blade is not so much increased.
[0007]
Accordingly, an object of the present invention is to provide a cutting blade having a cutting blade in which both the sharpness and wear resistance of the tip cutting edge are improved.
[0008]
[Means for Solving the Problems]
When coating the coating film on the cutting blade that forms the first blade with a small tip angle and a sharp cutting edge, the present inventor applies the film thickness of the coating film at the taper of the second blade over the entire surface. While controlling to 0.1-0.2 micrometer and setting it as the structure which provided the specific clearance without rubbing the blade edge | tip of a 1st blade and a 2nd blade, a sharpness is good and a favorable cut surface is obtained. At the same time, it was found to be a long-life slitter cutting blade.
[0009]
That is, in the slitting blade of the present invention, the overlapping portion of the cutting edge of the first blade and the cutting edge of the second blade while the first blade and the second blade rotate in opposite directions around the respective centers. in a slitter cutting blade forming the first blade and said second blade slitting tool to continuously cut by shearing object to be cut, the tip angle the second blade in the cutting edge Ah at 65 ° or less And the blade edge of the second blade forms a taper on the blade edge located on the side of the overlapping surface with the first blade and a relief is formed on the surface opposite to the surface facing the first blade, Both tapered shapes taper from both main surfaces toward the tip, and the peripheral edges of the first blade and the second blade are brought into sliding contact with each other by bringing the tip of the first blade into contact with the taper. In front of the first blade to overlap Disposed in parallel and a second blade, it is characterized in that at least the tapered is covered by the coating film having a thickness 0.1~0.2μm over the entire surface.
[0010]
Here, the arithmetic average roughness (Ra) of the surface of the second blade is 0.03 μm or less to realize smooth slitting, increase sharpness and reduce unnecessary load on the blade edge. This is desirable for extending the life of the blade.
[0011]
In addition, it is desirable that the coating film is made of a diamond-like carbon film from the viewpoints of improving wear resistance, preventing friction with the work material, preventing the work material from being wound, and removing chips.
[0012]
Furthermore, the slitting tool of the present invention is configured such that the first blade and the second blade of the slitter cutting blade rotate in directions opposite to each other around their centers, while the cutting edge of the first blade and the second blade The workpiece is continuously cut by shearing at the overlapping portion with the blade edge.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The slitting blade for continuous cutting of a long sheet-like workpiece such as resin film, magnetic tape, paper, metal foil, thin metal plate, etc. of the present invention, (a) Front view, (b) Schematic enlarged schematic view of the cutting edge portion in the SS section passing through the centers P and O of the cutting blades (first blade 2 and second blade 3), (c) overlap start point A of the first blade 2 and second blade 3 A description will be given based on FIG. 1, which is a schematic enlarged schematic view of a cutting edge portion in a TT cross section passing through the line.
[0014]
According to FIG. 1, the cutting blade 1 for slitter has predetermined cutting edges 2a, 3a of a first blade (lower blade) 2 and a second blade (upper blade) 3, which are two substantially disc-shaped cutting blades. The cutting blades 2 and 3 are arranged in parallel so as to overlap each other by an interval (overlap amount) D, and the respective cutting blades 2 and 3 are set so that each center is fixed and each of them is rotated around its axis. . In addition, according to this invention, the parallelism (L of FIG.1 (b)) of the virtual planes formed in the locus | trajectory of each peripheral part of the 1st blade (lower blade) 2 and the 2nd blade (upper blade) 3 is shown. ₁ parallelism between the L ₂₎ may be offset if it is within 2 degrees.
[0015]
According to the present invention, like the second blade (upper blade) 3 among the slitting blades 1, the tip angle θ at the blade tip is 60 ° or less, particularly 45 ° or less, further 10 to 30 °, and the tip of the blade tip is It is desirable to have a thin blade with a sharp edge with a radius of curvature of 5 μm or less, especially 3 μm or less. This makes it possible to reduce the stress applied to the material to be cut, and to achieve high processing with high dimensional accuracy and no sagging or burrs. It can be a surface.
[0016]
Further, according to the present invention, as shown in FIG. 2, at least the cutting edge of the second blade (upper blade) 3 that is a thin blade is coated with the coating film 11 having a film thickness of 0.1 to 0.2 μm. The peripheral edges of the first blade 2 and the second blade 3 are parallel to each other in a state where the peripheral edges of the first blade 2 and the second blade 3 are in sliding contact with each other in a state where the taper 5 is formed on the cutting edge located on the side of the overlapping surface with the first blade 2. It is a great feature that the cutting edge of the first blade and the second blade can be satisfactorily cut without contact with each other. 1
[0017]
In addition, as the coating film 11, the periodic table 4a, 5a, 6a group metal carbide, nitride, carbonitride, carbonitride, especially (Ti _a M _b ) C _x N _y O _z (however, M: At least one selected from the group consisting of Al, Zr, Cr and Si, 0 <a ≦ 1, 0 ≦ b <1, a + b = 1, 0 ≦ x ≦ 1, 0 ≦ y ≦ 1, 0 ≦ z ≦ 1, x + y + z = 1), diamond, diamond-like carbon (hereinafter abbreviated as DLC; DLC of the present invention also includes tetrahedral amorphous carbon), cubic boron nitride (cBN), and Al ₂ O ₃ A single layer or a plurality of layers can be suitably used for at least one hard coating film or fluororesin coating film selected from the group consisting of DLC, especially for improving wear resistance and chip disposal. Is desirable. In addition to the cutting edge 3a, the surface 5 facing the lower blade 2 is covered with the coating film 11 made of DLC, thereby preventing friction with the workpiece and preventing the work material from being wound easily. There is also an effect.
[0018]
Further, according to the present invention, it is desirable to form the coating film 11 having a film thickness of 2 μm or less also on the lower blade 2, whereby the polishing scraps on the workpiece due to rubbing wear between the lower blade 2 and the workpiece. Can be reduced.
[0019]
Here, if the material to be cut comes into contact with the cutting blade (upper blade 3) and causes entanglement due to poor peeling, poor welding resistance, or poor chip slidability, the material to be cut contacts. The slidable contact surface of the cutting blade (upper blade 3) passing therethrough (particularly the surface 5 facing the lower blade 2, the main surface F ₁ of the upper blade 3) and the surface 6 surface opposite to the slidable contact surface are arithmetically averaged. The roughness (Ra) is desirably controlled to a matte state of 0.1 to 0.4 μm, and in terms of friction reduction of the material to be cut and chip dischargeability, the sliding contact surface of the cutting blade (upper blade 3) (especially The surface 5 facing the lower blade 2, the main surface F ₁ ) of the upper blade 3, and the surface 6 opposite to the sliding contact surface have an arithmetic average roughness (Ra) of 0.03 μm or less, particularly 0.02 μm or less. It is desirable to control the mirror surface state. Incidentally, in the present invention, when DLC is used as the coating film 11, the arithmetic average roughness (Ra) of the surface of the main surface of the upper blade 3 (particularly, the surface 5 facing the lower blade 2, F ₁ ) is 0. It is desirable that it is 03 μm or less.
[0020]
In addition, according to this invention, the base material 12 of the 2nd blade (upper blade) 3 is 0.3-3.0 mass% in total by the carbide conversion at least 1 sort (s) chosen from the group of Cr, V, and Ta. In particular, 0.5 to 2% by mass and Co in a proportion of 8 to 15% by mass, particularly 9 to 13% by mass, with the balance being an average particle size of 0.1 to 0.5 μm, in particular 0.1 to Consisting of 0.4 μm WC particles has both the uniformity of the ultra-fine cemented carbide structure and the toughness that can withstand the grinding of the cutting edge, so that the cutting edge of the cutting edge 3 can be improved and the resistance of the cutting edge can be improved. This is desirable in that it is a cemented carbide that has both wear characteristics.
[0021]
Further, as described above, by forming a taper 5 as cut corner of the cutting edge 3a of the upper blade 3 of the overlapping side surface overlaps the cutting edge 3a located in F ₁ F ₁ side, lower blade 2 and the wafer As a result of preventing the three cutting edges 2a and 3a from coming into contact with each other and rubbing with each other, it is possible to reduce wear debris due to contact between the cutting edges and to prolong the life of each of the cutting edges 2a and 3a, and the cutting edges 2a and 3a start to overlap. FIG. 1C is a laterally enlarged side view showing the arrangement of the lower blade 2 and the upper blade 3 in the TT cross section passing through the point A, and the lower blade 2 and the upper blade 3 in the SS cross section passing through the point B. As shown in FIG. 1 (b) which is a laterally enlarged side view showing the arrangement, a clearance with a predetermined minute width (distance between the blade edge of the upper blade 3 and the lower blade 2) E is accurately set over a long period of time. be able to.
[0022]
That is, as shown in FIG. 1A, the lower blade 2 and the upper blade 3 of the slitter cutting blade 1 adjusted and set to the clearance E controlled to a predetermined minute width as described above. By continuously feeding the material to be cut (not shown) so as to cross the side surface direction of the slitter cutting blade 1 vertically while rotating in the opposite directions around the centers of the cutting blades 2 and 3, the point A To the vicinity of the point B, in particular at the point A, the portion where the lower blade 2 and the upper blade 3 approximately overlap, in other words, a predetermined width formed between the blade edges 2a and 3a of the material to be cut. A desired effective shear stress is applied to the portion entering the clearance E portion, and the workpiece can be continuously cut into a sharp shear surface with a small force.
[0023]
Here, according to the present invention, in that it can easily set the predetermined amount of clearance of the sub μm~ number μm order, the taper angle theta ₁ of the cutting edge 3a of the upper blade 3 is 0 ° 15'~40 ° Is desirable.
[0024]
Further, in order to increase the sharpness between the blade edges 2a and 3a and to allow the workpiece to be cut after cutting to incline and to escape without receiving an excessive force from the cutting blades 2 and 3, as shown in FIG. as shown in the schematic side view of the lower blade 2, it is desirable to overlapping surface F ₁ of the upper blade 3 is formed into a inclined by concave inclination angle theta _{2 =} 2 to 10 ° toward the center 3b the cutting edge 3a .
[0025]
That is, the angle θ ₃ formed by the cutting edge 2a of the lower blade 2 and the cutting edge 3a of the upper blade 3, that is, the angle θ ₃ formed by the axis L ₁ of the first blade 2 and the taper 5 of the cutting edge 3a of the upper blade ₃ (θ ₁ −θ ₂ ) is preferably 0 to 30 °, and thereby, a fine width of clearance E = (D / 2) × tan θ ₃ , particularly a clearance E of 0.005 to 0.1 mm can be accurately and easily obtained. Can be set. Here, the axis L ₁ refers to a straight line passing between the cutting edge facing through the center P of the lower blade 2 (2a, 2a ').
[0026]
Incidentally, other than the conventional cutting place is inward from the perpendicular to the axis of the blade surface so as not to contact, Yes in several degrees of relief (undercut) is taken, the cutting edge 2a positioned in overlapping surface F ₂ of the lower blade 2 It is desirable that the taper 7 is formed. Further, by forming the notch 8 inside the predetermined distance from the cutting edge 2a of the lower blade 2, there is an effect that workability is good when the cutting edge is polished with a grindstone.
[0027]
The lower blade 2 in FIG. 1 may of course be formed of the same ultrafine cemented carbide as the upper blade 3. FIG. 1 illustrates a slitter cutting blade, but the present invention is not limited to this, and a thin blade such as a specially shaped blade such as a gobel blade, a gang blade, a plate blade, or a fiber cutting knife is used. It can use suitably also about the cutting blade to comprise.
[0028]
【Example】
Tungsten carbide (WC) powder having an average particle size of 0.4 μm, 10% by mass of metallic cobalt (Co) powder, 0.3% by mass of vanadium carbide (VC) powder, 0% of chromium carbide (Cr ₃ C ₂ ) powder .6% by mass, methanol as a solvent, and as a grinding medium, a tungsten carbide particle having an average particle diameter of 0.3 μm and a 3 mm diameter ball made of cemented carbide is added, and an attritor for 20 hours. After pulverizing, mixing and drying, it was formed into a predetermined donut disk shape by press molding and fired at 1380 ° C. for 1 hour to produce a cemented carbide.
[0029]
Next, the cutting blade made of cemented carbide is ground with a diamond grindstone on the surface of the cutting blade (upper blade 3) made of cemented carbide (upper blade 3) (surface 5, F1, 6 in FIG. 1). The mirror surface had an angle of 30 ° and an arithmetic average roughness (Ra) of 0.01 μm or less.
[0030]
And the coating film which consists of DLC with a film thickness of 0.2 micrometer was coat | covered by the P-CVD method to the said whole cutting blade. In addition, after forming a coating film, when the arithmetic mean roughness (Ra) of the upper blade 3 surface (taper surface 5) was measured again, it was also 0.01 micrometer or less.
[0031]
In the same manner as the obtained cutting blade with DLC coating film (upper blade), a lower blade is produced with the same base material and coating film material, and a slitting tool as shown in FIG. A slitting test was conducted using aluminum foil under the following conditions.
[0032]
<Conditions>
Tape speed: 100 m / min Overlap amount of upper and lower blades: 0.5 mm
During the slitting test, the state of the processed surface of the material to be cut was observed with a microscope at any time, and the time when burrs or deformation occurred on the cut surface was evaluated as the life, and it was possible to cut a length of 160 × 10 ⁴ m.
[0033]
(Comparative Example 1)
The cutting blade and slitting tool are the same as in the embodiment except that the DLC coating film thickness is 2 μm and the blade edge configuration is such that the first blade and the second blade rub against the slitting blade of the embodiment. Was manufactured and evaluated in the same manner, the life of the cutting blade was 30 × 10 ⁴ m.
[0034]
(Comparative Example 2)
A cutting blade and a slitting tool were prepared in the same manner as in Comparative Example 1 except that the film thickness of the DLC coating was set to 0.3 μm with respect to the cutting blade for slitter in Comparative Example 1, and the evaluation was performed similarly. The lifetime was 50 × 10 ⁴ m.
[0035]
【The invention's effect】
As described above in detail, the slitting blade of the present invention desirably has a film thickness of 0.1 over the entire surface of the coating film at the taper when the coating film is coated on a cutting blade with a sharp edge. It controls the ～0.2Myuemu, by adopting a configuration that can cut satisfactorily without the blade edge of the first blade and the second blade is in contact, it is possible to improve the cutting stand of the cutting tip of the cutting blade, the cutting edge tip Since it is a thin blade having both wear resistance, it exhibits excellent slitting performance.
[Brief description of the drawings]
FIGS. 1A to 1C are schematic views showing the structure of a slitter as an example of the cutting blade of the present invention.
FIG. 2 is a conceptual cross-sectional view for explaining a configuration of a cutting edge of a cutting blade.
FIG. 3 is a conceptual diagram for explaining the configuration of a cutting edge coated with a conventional coating film.
[Explanation of symbols]
1 Cutting blade for slitter 2 First blade (lower blade)
3 Second blade (upper blade (cutting blade))
5, 7 Tapered surface 6 Main surface opposite to the surface facing the lower blade of the upper blade 8 Notch 11 Coating film 12 Base material

Claims (4)

While the first blade and the second blade rotate in opposite directions around their centers, the workpiece is continuously cut by shearing at the overlapping portion of the blade edge of the first blade and the blade edge of the second blade. a slitter cutting blade forming the first blade and said second blade slitting tool to the second blade Ah at the tip angle of 65 ° or less in cutting Rutotomoni, the cutting edge of the second blade, Both the taper is formed on the cutting edge located on the side of the overlapping surface with the first blade and the relief is formed on the surface opposite to the surface facing the first blade, and both taper from both main surfaces toward the tip. The first blade and the first blade such that the peripheral edges of the first blade and the second blade are in sliding contact with each other by bringing the tip of the first blade into contact with the taper. disposed in parallel with said second blade, at least prior to Slitter cutting blade, wherein the taper is coated with the coating film having a thickness 0.1~0.2μm over the entire surface.   The slitting blade for slitter according to claim 1, wherein an arithmetic average roughness (Ra) of a surface of the second blade is 0.03 µm or less.   The slitting blade according to claim 1 or 2, wherein the coating film is made of a diamond-like carbon film.   While the said 1st blade and 2nd blade of the cutting blade for slitters in any one of Claims 1 thru | or rotate in the mutually opposite direction centering on each center, the blade edge | tip of the said 1st blade and the said 2nd blade A slitting tool characterized by continuously cutting a workpiece by shearing at an overlapping portion with a blade edge.

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