CN112236259A - End mill for cutting optical thin film and method for manufacturing optical thin film using the same - Google Patents
End mill for cutting optical thin film and method for manufacturing optical thin film using the same Download PDFInfo
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- CN112236259A CN112236259A CN201980037139.4A CN201980037139A CN112236259A CN 112236259 A CN112236259 A CN 112236259A CN 201980037139 A CN201980037139 A CN 201980037139A CN 112236259 A CN112236259 A CN 112236259A
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Abstract
Provided is an end mill which can suppress cracks, yellow streaks, chipping, and fuzzing when an optical film is cut. The end mill for cutting an optical thin film of the present invention has a body rotating about a rotation axis and a cutting blade projecting from the body to have an outermost diameter, wherein the cutting blade has a helix angle of 0 DEG and an inclination angle of 5 to 45 deg. The method for producing an optical film of the present invention includes a step of cutting an end face of the optical film by using the above-described end mill for optical film cutting.
Description
Technical Field
The invention relates to an end mill for cutting an optical thin film and a method for manufacturing the optical thin film by using the end mill.
Background
It is known that an end face of an optical film (for example, a polarizing plate) is cut. In such cutting, there is a case where a cutting tool having a cutting blade extending in a direction of a rotation axis (for example, in parallel with the rotation axis) is used (for example, see patent document 1). However, the cutting process using such a cutting tool has the following problems: (i) cracks are easily generated in the optical film; (ii) easily discolored by friction (so-called yellow bands are easily generated); (iii) when an adhesive layer (e.g., an adhesive layer or an adhesive layer) is present in the optical film, the optical film is likely to be chipped (when the adhesive or the adhesive of the adhesive layer is scraped by a cutting blade); and (iv) fuzz is likely to occur (incomplete cutting).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2015-72453
Disclosure of Invention
Summary of The Invention
Problems to be solved by the invention
The present invention has been made to solve the above conventional problems, and a main object thereof is to provide an end mill capable of suppressing cracks, yellow streaks, chipping, and fuzzing when an optical film is cut.
Means for solving the problems
The end mill for cutting an optical thin film of the present invention has a body rotating about a rotation axis, and a cutting blade projecting from the body to have an outermost diameter, wherein the cutting blade has a helix angle of 0 DEG and an inclination angle of 5 to 45 deg.
In 1 embodiment, the end mill for optical film cutting includes: the clearance angle of the cutting blade is 5-30 degrees.
In 1 embodiment, the end mill for optical film cutting includes: the cutting edge has a tip angle of 45 ° or more. In another embodiment, the end mill for optical film cutting includes: the knife point angle is more than 55 degrees. In another embodiment, the end mill for optical film cutting includes: the knife-edge angle is less than 65 degrees.
In 1 embodiment, the end mill for optical film cutting includes: the outer diameter is less than 10 mm.
In 1 embodiment, the cutting edge comprises sintered diamond.
In 1 embodiment, the end mill for optical film cutting includes: the cut optical film includes a polarizer, an adhesive layer, a surface protective film, and a separator (separator), and the separator has a peeling force smaller than that of the surface protective film.
According to other aspects of the present invention, a method of manufacturing an optical film may be provided. The manufacturing method includes a step of cutting an end face of the optical film by using the end mill for optical film cutting.
In 1 embodiment, the optical film includes a polarizing plate.
In 1 embodiment, the polarizing plate includes a polarizer, an adhesive layer, a surface protective film, and a separator, and the separator has a peeling force smaller than that of the surface protective film.
Effects of the invention
According to the present invention, in the end mill for cutting an optical film having a cutting blade with a helix angle of 0 °, the inclination angle of the cutting blade is set to a predetermined range, whereby cracks, yellow streaks, chipping, and fuzzing can be suppressed when the optical film is cut.
Drawings
Fig. 1 (a) is a schematic plan view viewed from the axial direction for explaining the structure of an end mill for optical thin film cutting according to 1 embodiment of the present invention; fig. 1 (b) is a schematic perspective view of the end mill for optical film cutting shown in fig. 1 (a).
Fig. 2 is a schematic plan view showing an example of the shape of a non-linearly processed optical thin film obtained by the method for producing an optical thin film using an end mill for optical thin film cutting according to the embodiment of the present invention.
Fig. 3 is a schematic perspective view for explaining the cutting process of the optical thin film using the end mill for optical thin film cutting according to the embodiment of the present invention.
Fig. 4 (a) to 4 (e) are schematic plan views illustrating a series of procedures of nonlinear cutting, which is an example of the cutting of the optical thin film using the end mill for optical thin film cutting according to the embodiment of the present invention.
Detailed Description
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments. Further, the drawings are schematically shown for easy viewing, and the proportions, angles, and the like of the length, width, thickness, and the like in the drawings are different from those in reality.
A. End mill for cutting optical thin film
Fig. 1 (a) is a schematic plan view viewed from the axial direction for explaining the structure of an end mill for optical thin film cutting (hereinafter, simply referred to as an end mill) according to 1 embodiment of the present invention; fig. 1 (b) is a schematic perspective view of the end mill of fig. 1 (a). The end mill 100 of the illustrated example has: a main body 20 which rotates around a rotation axis 22 extending in a vertical direction (a stacking direction of the work 200, which is a cutting object on which an optical thin film is stacked, and which will be described later in detail), and a cutting blade 10 which protrudes from the main body 20 and has an outermost diameter. The end mill is typically a straight end mill (straight end mill). Further, in the embodiment of the present invention, the helix angle of the cutting edge 10 is 0 °. With such a configuration, the optical film can be cut satisfactorily. More specifically, when cutting (for example, profile machining or non-linear machining) is performed using a cutting blade having a helix angle, and when the cutting surface is tapered when viewed in the lateral direction, the cutting surface can be prevented from being tapered by using a cutting blade having a helix angle of 0 °. In particular, a significant effect can be obtained when the optical thin film is subjected to fine nonlinear processing (profile processing) using a small-diameter end mill. In the present specification, the "helix angle of 0 °" means that the blade tip 10a extends in a direction substantially parallel to the rotation axis 22, in other words, the blade is not twisted with respect to the rotation axis. "0 °" means substantially 0 °, and includes a case where the material is twisted by a slight angle due to a machining error or the like.
The cutting blade 10 may be formed integrally with the body 20 (i.e., may be formed by cutting a raw material to form an end mill), or may be attached to the body 20 as a separate body. Cutting edge 10 typically includes an edge tip 10a, a chamfer (すくい face) 10b, and a clearance face (escape し face) 10 c. A pocket 30(pocket) is defined by the slope 10b and the body 20. The shape of the clearance surface 10c in plan view may be curved (may have 2 clearance surfaces), linear, or smoothly curved as illustrated in the figure. Preferably, the clearance surface 10c has been roughened. As the roughening treatment, any appropriate treatment may be used. A typical example is a sand blasting treatment. By roughening the surface of the cleft, adhesion of an adhesive or an adhesive to the cutting blade can be suppressed when the optical film includes an adhesive layer (e.g., an adhesive layer or an adhesive layer), and as a result blocking can be suppressed. In the present specification, "adhesion" refers to a phenomenon in which optical films in a work are adhered to each other by an adhesive or an adhesive on end faces when the optical films include an adhesive layer, and the adhesive or the adhesive chips attached to the end faces promote adhesion of the optical films to each other.
In the embodiment of the present invention, the inclination angle α of the cutting edge 10 is 5 ° to 45 °, preferably 5 ° to 30 °. When the inclination angle α is within this range, the chip pocket 30 can be set to an appropriate size to satisfactorily discharge the cutting chips while ensuring the sharpness of the cutting edge and appropriately suppressing the resistance during the cutting process. As a result, cracks and yellow bands in the optical film can be favorably suppressed, and moreover, in the case where the optical film has an adhesive layer, gel shortage can be favorably suppressed. Further, if the inclination angle α is too large, particularly in the case where the cutting blade is attached to the body as a separate body, the manufacturing itself of the cutting blade (ultimately, the end mill) may become difficult. The clearance angle β of the cutting edge 10 is preferably 5 ° to 30 °, preferably 5 ° to 25 °. If the clearance angle β is within such a range, contact between the clearance surface 10c and the workpiece 200 can be prevented, and resistance during cutting can be appropriately suppressed. Further, it is possible to prevent a situation where the blade angle γ becomes excessively small. As a result, cracks and yellow bands in the optical film can be favorably suppressed, and moreover, in the case where the optical film has an adhesive layer, gel shortage can be favorably suppressed. In addition to this, the life of the cutting edge can be increased. The cutting edge angle γ of the cutting edge 10 is preferably 45 ° or more, and more preferably 55 ° or more. As long as the point angle γ is within such a range, the life of the cutting edge can be increased. Considering the inclination angle α and the clearance angle β, the tip angle γ is preferably less than 85 °, preferably 80 ° or less, and more preferably 75 ° or less. In other embodiments, the tip angle γ is 65 ° or less. If the cutting edge angle γ is within such a range, the occurrence of fuzz can be suppressed while maintaining a good life of the cutting edge (suppressing breakage of the edge tip). In 1 embodiment, the inclination angle α is preferably in the range of 5 ° to 15 °, the clearance angle β is preferably in the range of 15 ° to 25 °, and the knife tip angle γ is preferably in the range of 55 ° to 65 °. In the present specification, the "inclination angle α" is an angle formed by a straight line connecting the blade tip 10a and the rotation axis 22 and the inclined surface 10 b; "clearance angle β" is the angle formed by the cutting face of the workpiece 200 and the clearance face 10 c; the "edge angle γ" is an angle defined with the edge tip 10a as the apex, and is an angle calculated from the following equation: 90 deg. -inclination angle alpha-clearance angle beta.
The number of cutting edges of the end mill may be any number as appropriate according to the purpose. The number of blades may be 1 blade, 2 blades, or 3 blades or more, as shown in the figure. Preferably, the number of blades is 1 to 3. With such a configuration, the distance between the cutting edges can be appropriately secured, and thus the cutting chips can be discharged well. More preferably, the number of blades is 2. With such a configuration, the rigidity of the cutting blade is ensured, and the chip pocket is ensured, so that the cutting chips can be discharged well.
The edge thickness δ of the end mill is preferably 1.5mm or less, more preferably 1.2mm or less, and still more preferably 1.0mm or less. The lower limit of the thickness is preferably 0.3mm, more preferably 0.6 mm. By setting the thickness of the blade within such a range, the cutting sharpness can be maintained. In addition, the cutting edge angle can be adjusted to achieve both a good tool life and a good cutting quality.
The outer diameter of the end mill is preferably less than 10mm, more preferably 3mm to 9mm, more preferably 4mm to 7 mm. According to the embodiment of the present invention, for example, in the fine nonlinear machining (profile machining) using such a small-diameter end mill, the crack and the yellow band of the optical film can be favorably suppressed, and in the case where the optical film has an adhesive layer, the shortage of the adhesive can be favorably suppressed. In the present specification, the term "outer diameter of the end mill" refers to a value obtained by multiplying a distance from the rotation axis 22 to the cutting edge tip 10a by 2.
In 1 embodiment, the cutting edge 10 comprises sintered diamond. With such a configuration, fine non-linear machining (profile machining) using the small-diameter end mill as described above can be performed satisfactorily.
B. Method for producing optical film
A method for producing an optical film according to an embodiment of the present invention includes a step of cutting an end face of an optical film by using the end mill for optical film cutting described in the above item a. More specifically, the manufacturing method includes a step of forming a work by stacking a plurality of optical films, and a step of cutting an end face of the optical film constituting the work by cutting an outer peripheral surface of the work. In 1 embodiment, the cutting process includes a non-linear process (profile process).
Specific examples of the optical film include a polarizer, a retardation film, a polarizing plate (typically, a laminate of a polarizer and a protective film), a conductive film for a touch screen, a surface-treated film, and a laminate obtained by appropriately laminating these materials according to the purpose (for example, a circularly polarizing plate for antireflection and a polarizing plate with a conductive layer for a touch screen). In 1 embodiment, the optical film includes an adhesive layer (e.g., an adhesive layer). According to the embodiment of the present invention, even in the optical film including the adhesive layer, the shortage of the adhesive during the cutting process can be suppressed.
In 1 embodiment, the optical film may be an adhesive layer-attached polarizing plate including a surface protective film, a polarizer, an adhesive, and a separator in this order. In 1 embodiment, the peeling force of the separator is smaller than that of the surface protective film. When an end mill is used for such an adhesive layer-attached polarizing plate, the separator having a peeling force smaller than that of the surface protective film is likely to be detached from the edge of the end mill, and thus fuzzing may occur. However, according to the embodiment of the present invention, the cutting edge angle is set to 55 ° to 65 °, whereby the separator side is suppressed from fluffing while maintaining a good cutting sharpness, and a good life of the cutting edge (the edge tip is suppressed from being damaged) can be further realized.
Hereinafter, a method for manufacturing a polarizing plate with an adhesive layer as an example of an optical film will be described. Specifically, each step in the method for manufacturing the planar polarizing plate with an adhesive layer will be described with reference to fig. 2. It is obvious to those skilled in the art that the optical film is not limited to the polarizing plate with an adhesive layer and the planar shape of the polarizing plate with an adhesive layer is not limited to the planar shape shown in fig. 2. That is, the manufacturing method of the present invention can be applied to any optical film having any shape.
B-1. formation of work
Fig. 3 is a schematic perspective view for explaining the cutting process of the optical film, and a work 200 is shown in this figure. As shown in fig. 3, a work 200 in which a plurality of optical films (adhesive layer-attached polarizing plates) are stacked may be formed. Since the adhesive layer-attached polarizing plate can be manufactured by a conventional method known in the art, a detailed description of the manufacturing method is omitted. The adhesive layer-attached polarizing plate can be typically cut into any appropriate shape when a work is formed. Specifically, the adhesive layer-attached polarizing plate may be cut into a rectangular shape, a shape similar to the rectangular shape, or an appropriate shape (for example, a circular shape) according to the purpose. In the illustrated example, the adhesive layer-attached polarizing plate is cut into a rectangular shape, and the work 200 has outer peripheral surfaces (cut surfaces) 200a and 200b facing each other and outer peripheral surfaces (cut surfaces) 200c and 200d orthogonal to the same. The workpiece 200 is preferably clamped from above and below by a clamping mechanism (not shown). The overall thickness of the workpiece is preferably from 10mm to 50mm, more preferably from 15mm to 25mm, and more preferably about 20 mm. Such a thickness prevents damage due to pressing by the clamping mechanism or impact during cutting. The adhesive layer-attached polarizing plates are overlapped so that the work has such a total thickness as described above. The number of the adhesive layer-attached polarizing plates constituting the work may be, for example, 20 to 100. The clamping mechanism (e.g. jig) can be made of soft material or hard material. When the soft material is used, the hardness (JIS a) is preferably 60 ° to 80 °. If the hardness is too high, an indentation of the clamping mechanism may remain. If the hardness is too low, the jig may be deformed to cause a positional deviation, which may result in insufficient cutting accuracy.
B-2. end milling cutter machining
Next, a predetermined position of the outer peripheral surface of the workpiece 200 is cut by the end mill 100. The end mill 100 is typically held by a machine tool (not shown), rotated at high speed around a rotation axis of the end mill, and used by being fed in a direction intersecting the rotation axis while being brought into contact with a cutting blade and being cut into an outer peripheral surface of the workpiece 200. That is, typically, the cutting is performed by bringing the cutting blade of the end mill into contact with and cutting into the outer peripheral surface of the workpiece 200. In the case of manufacturing the adhesive layer-attached polarizing plate in a plan view as shown in fig. 2, chamfered portions 200E, 200F, 200G, and 200H are formed at 4 corner portions of the outer periphery of the work 200, and a recess 200I is formed at a central portion of the outer peripheral surface connecting the chamfered portions 200E and 200H.
The cutting process of the workpiece 200 will be described in detail. First, as shown in fig. 4 (a), the portion of fig. 2 where the chamfered portion 200E is formed is chamfered, and then, as shown in fig. 4 (b) to 4 (d), the portions where the chamfered portions 200F, 200G, and 200H are formed are chamfered in this order. Finally, as shown in fig. 4 (e), the recess 200I is formed by cutting. In the illustrated example, the chamfered portions 200E, 200F, 200G, and 200H and the recessed portion 200I are formed in this order, but these may be formed in any appropriate order.
The cutting conditions may be appropriately set according to the structure of the adhesive layer-attached polarizing plate, the desired shape, and the like. For example, the rotation speed (rotation number) of the end mill is preferably less than 25000rpm, more preferably 22000rpm or less, and still more preferably 20000rpm or less. The lower limit of the rotation speed of the end mill may be, for example, 10000 rpm. For example, the feed rate of the end mill is preferably 500 mm/min to 10000 mm/min, more preferably 500 mm/min to 2500 mm/min, and still more preferably 800 mm/min to 1500 mm/min. The number of cuts at the cutting site of the end mill may be 1 cut, 2 cuts, 3 cuts or more.
The above-described process can produce a polarizing plate with an adhesive layer that has been cut. In the illustrated example, an adhesive layer-attached polarizing plate including a non-linearly processed portion can be obtained.
Examples
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Further, the evaluation items in the examples are as described below.
(1) Crack(s)
The adhesive layer-attached polarizing plates obtained in examples and comparative examples (all of the adhesive layer-attached polarizing plates constituting the work) were evaluated by visually checking the occurrence of cracks and by the following criteria. In addition, the crack is an image observed by being magnified with an optical microscope.
Very good: no crack was observed
O: although some cracks are seen, the extent thereof is not practically problematic
X: see the crack
(2) Yellow belt
The adhesive layer-attached polarizing plates obtained in examples and comparative examples (all of the adhesive layer-attached polarizing plates constituting the work) were evaluated by visually checking the occurrence of yellow bands based on the following criteria. In addition, the yellow band is an image magnified by an optical microscope.
Very good: yellow belt is not seen
O: although a slightly yellowish band is seen, the extent thereof is not problematic in practical use
X: see the yellow belt
(3) Lack of glue
The adhesive layer-attached polarizing plates obtained in examples and comparative examples (all of the adhesive layer-attached polarizing plates constituting the work) were evaluated by visually checking the state of the missing adhesive (the adhesive layer was scraped off by a cutting blade and was lacking).
Very good: no gum shortage is seen
O: although some gel shortage was observed, the degree thereof was not problematic in practical use
X: seeing the glue shortage
(4) Life of cutting blade
The state of the cutting blade used in the examples and comparative examples after cutting was confirmed.
Very good: no flaw or defect on the blade and good durability
O: slight scar on the blade
(5) Raising of wool
The work pieces cut in the examples and comparative examples were fixed in a bundled state, and the end portions were observed in reflection under a fluorescent lamp. The workpiece including the sample having fuzz was visually confirmed to have a white color at the end face. The size of fuzz was visually confirmed in the portion discolored to white in one bundle of workpieces, and evaluation of fuzz was performed according to the following criteria.
Very good: no fuzz was observed
O: since there was a portion which was very slightly discolored to white, the size of fuzz was confirmed, and although some fuzz was observed, the degree thereof was not a problem in practical use
And (delta): since there was a portion slightly discolored to white, the degree of fuzz was confirmed, and although fuzz was observed, the fuzz was still within the reference range
X: visual fuzzing
< production example 1> production of adhesive layer-attached polarizing plate
As the polarizer, a film (thickness: 12 μm) obtained by uniaxially stretching a long polyvinyl alcohol (PVA) resin film in the longitudinal direction (MD direction) while containing iodine was used. An optically functional film (COP film with an antistatic layer) was bonded to one side of the polarizer. The COP film with an antistatic layer was a cycloolefin polymer (COP) film (25 μm) on which an antistatic layer (5 μm) was formed, and was laminated so that the COP film was on the polarizer side. A surface protection film was bonded to the antistatic layer side of the obtained polarizer/COP film/antistatic layer laminate. On the other hand, a retardation film of a cycloolefin resin (product name "ZB-12" manufactured by ZEON corporation, japan) having an in-plane retardation Re (550) of 50nm and a thickness of 40 μm) was laminated on the polarizer side of the laminate. Further, an adhesive layer (thickness 20 μm) was formed on the outside of the retardation film, and a separator (separator) was attached to the adhesive layer. Thus, an adhesive layer-attached polarizing plate 1 having a structure of a surface protective film/an antistatic layer/a COP film/a polarizer/a retardation film/an adhesive layer/a separator was produced.
< production example 2> production of adhesive layer-attached polarizing plate
A polarizer was produced in the same manner as in production example 1, and a luminance improving film (product name "DBEF" manufactured by 3M) was bonded to one side of the polarizer. A surface protective film was bonded to the obtained polarizer/luminance improving film on the luminance improving film side. On the other hand, a saponified acrylic resin film having a thickness of 40 μm was bonded to the polarizer side of the laminate. Further, an adhesive layer (thickness: 20 μm) was formed on the outer side of the acrylic resin film, and a separator was bonded to the adhesive layer. Thus, an adhesive layer-attached polarizing plate 2 having a structure of a surface protective film/a brightness enhancement film/a polarizer/an acrylic film/an adhesive layer/a separator was produced.
< example 1>
The adhesive layer-attached polarizing plate 1 obtained in production example 1 was cut into a size of 5.7 inches (about 140mm in the vertical direction and 65mm in the horizontal direction), and the cut polarizing plate was stacked into a plurality of pieces to form a work (about 20mm in total thickness). The obtained work was clamped by a jig (jig) and cut by an end mill having a helix angle of 0 ° to form chamfered portions at 4 corners of the outer periphery of the work, and a concave portion was formed in the center of 1 out of 4 outer peripheral surfaces, thereby obtaining an adhesive layer-attached polarizing plate that was not linearly processed as shown in fig. 2. Here, the end mill had 1 cutting edge number, an outer diameter of 5mm, an inclination angle of the cutting edge of 5 °, a clearance angle of 15 °, and a nose angle of 70 °. Further, the feed speed of the end mill was 1200 mm/min, and the rotation speed was 15000 rpm.
The nonlinear-processed adhesive layer-attached polarizing plate obtained finally was subjected to the evaluations (1) to (3) above. Further, the cutting edge was evaluated in the above (4). The evaluation in (5) was also performed on the cut adhesive layer-attached polarizing plate. The results are shown in table 1.
< examples 2 to 6 and comparative example 1>
An adhesive layer-attached polarizing plate was produced in the same manner as in example 1, except that the inclination angle, the clearance angle, and the edge angle of the cutting edge of the end mill were changed as shown in table 1. The obtained non-linearly processed adhesive layer-attached polarizing plate was used for the evaluations (1) to (3) above. Further, the above evaluation (4) was performed for the cutting blade used. The evaluation in (5) was also performed on the cut adhesive layer-attached polarizing plate. The results are shown in table 1.
< example 7>
An adhesive layer-attached polarizing plate was produced in the same manner as in example 1, except that the adhesive layer-attached polarizing plate 2 obtained in production example 2 was used, and the non-linear processing was performed as shown in fig. 2. The obtained non-linearly processed adhesive layer-attached polarizing plate was used for the evaluations (1) to (3) above. Further, the above evaluation (4) was performed for the cutting blade used. The evaluation in (5) was also performed on the cut adhesive layer-attached polarizing plate. The results are shown in table 1.
< examples 8 to 12 and comparative example 2>
An adhesive layer-attached polarizing plate was produced in the same manner as in example 7, except that the inclination angle, the clearance angle, and the edge angle of the cutting edge of the end mill were changed as shown in table 1. The obtained non-linearly processed adhesive layer-attached polarizing plate was used for the evaluations (1) to (3) above. Further, the above evaluation (4) was performed for the cutting blade used. The evaluation in (5) was also performed on the cut adhesive layer-attached polarizing plate. The results are shown in table 1.
< comparative example 3>
Although the end mill with an inclination angle of 50 ° was attempted to be manufactured, it could not be manufactured.
[ Table 1]
< evaluation >
As is clear from table 1, according to the embodiments of the present invention, it is possible to suppress cracks, yellow stripes, and starving in the cutting process of an optical film (here, an adhesive layer-attached polarizing plate) by setting the inclination angle of the cutting edge of the end mill to a predetermined range. Further, by setting the lower limit of the inclination angle to a predetermined value or more, the sharpness of the blade can be made better, and as a result, the cracks, the yellowish tinge and the gel shortage can be suppressed more favorably (comparison of example 1 with examples 2 to 6, and comparison of example 7 with examples 8 to 12). Further, by setting the upper limit of the inclination angle to a predetermined value or less, it is possible to secure chip pockets of an appropriate size, and as a result, it is possible to reduce friction caused by cutting chips and to suppress yellow bands more favorably (comparison of example 6 with examples 2 to 5, and comparison of example 12 with examples 8 to 11). In addition, by setting the cutting edge angle to a predetermined value or more, the life of the cutting edge can be increased. Further, by setting the cutting edge angle to a predetermined value or less, the cutting sharpness can be improved, and as a result, fuzz can be suppressed (comparison of examples 4 to 6 with examples 1 to 3, and comparison of examples 10 to 12 with examples 7 to 9). Further, by setting the edge angle to a predetermined range, it is possible to satisfy the excellent life of the cutting edge (suppression of damage of the edge tip) while maintaining the suppression of fuzzing (comparison of examples 3 to 4 with examples 1 to 2 and 5 to 6, and comparison of examples 9 to 10 with examples 7 to 8 and 11 to 12).
Industrial applicability
The end mill of the present invention is suitably used for cutting an optical film. The optical film cut by the end mill of the present invention can be used for a special-shaped image display unit such as an automobile instrument panel or a smart watch.
Description of the reference symbols
Angle of inclination of alpha …
Angle of beta … clearance
Gamma … corner angle
Delta … blade edge thickness
10 … cutting blade
10a … knife edge point
10b … inclined plane
10c … clearance surface
20 … Main body
22 … rotating shaft
30 … crumb point
100 … end mill
200 … workpiece
Claims (11)
1. An end mill for cutting an optical film, comprising a body rotating about a rotation axis and a cutting blade projecting from the body and having an outermost diameter,
the helix angle of the cutting blade is 0 degree, and the inclination angle is 5-45 degrees.
2. The end mill for optical film cutting as claimed in claim 1,
the clearance angle of the cutting blade is 5-30 degrees.
3. The end mill for optical film cutting as claimed in claim 1 or 2,
the cutting edge angle of the cutting blade is more than 45 degrees.
4. The end mill for optical film cutting as claimed in claim 3,
the knife sharp angle is more than 55 degrees.
5. The end mill for optical film cutting as claimed in claim 3 or 4,
the knife sharp angle is less than 65 degrees.
6. The end mill for optical film cutting as claimed in any one of claims 1 to 5,
the outer diameter of the end mill for cutting the optical thin film is less than 10 mm.
7. The end mill for optical film cutting as claimed in any one of claims 1 to 6,
the cutting edge comprises sintered diamond.
8. The end mill for optical film cutting as claimed in any one of claims 1 to 7,
the cut optical film includes a polarizer, an adhesive layer, a surface protective film, and a separator, and the separator has a peeling force smaller than that of the surface protective film.
9. A method for manufacturing an optical film, comprising a step of coating a substrate,
comprising the step of cutting the end face of the optical film by using the end mill for optical film cutting according to any one of claims 1 to 8.
10. The manufacturing method according to claim 9,
the optical film includes a polarizing plate.
11. The manufacturing method according to claim 10,
the polarizing plate includes a polarizer, an adhesive layer, a surface protective film, and a separator, and the separator has a peeling force smaller than that of the surface protective film.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018117679 | 2018-06-21 | ||
| JP2018-117679 | 2018-06-21 | ||
| JP2019-080282 | 2019-04-19 | ||
| JP2019080282A JP2020001160A (en) | 2018-06-21 | 2019-04-19 | End mill for cutting optical film, and optical film manufacturing method using the same |
| PCT/JP2019/018793 WO2019244505A1 (en) | 2018-06-21 | 2019-05-10 | Optical film cutting end mill and optical film production method using said end mill |
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| CN112236259A true CN112236259A (en) | 2021-01-15 |
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| JP (1) | JP2020001160A (en) |
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| CN116748577A (en) * | 2022-03-14 | 2023-09-15 | 日东电工株式会社 | Composite cutting tool and method for manufacturing resin sheet using the same |
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Also Published As
| Publication number | Publication date |
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| TWI821291B (en) | 2023-11-11 |
| JP2020001160A (en) | 2020-01-09 |
| TW202000349A (en) | 2020-01-01 |
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