JP2007196370A - Method for machining and cutting object to be processed, rotary tool, and cutting device having the rotary tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for machining and cutting a soft material capable of realizing an excellent cut sectional shape of a work such as a cover and a core of a plastic optical fiber. <P>SOLUTION: When a work P is machined or cut by a rotary tool 1 having a machining blade 3 on an outer circumferential part of a rotating body 2 in a machining and cutting method, the machining blade 3 has a pointed portion 36 having one point sharply projecting in at least one direction of a side in the direction parallel to a rotary shaft 43 of the rotating body 2. By rotating the rotating body 2, a cutting edge 32 of the machining blade 3 is brought into line contact with the work P to machine the work P with the width of tooth, and a side face of the work P is mirror-finished at the plane along the locus depicted only by the pointed portion 36 having one point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for cutting / cutting a workpiece, a method for cutting / cutting a plastic optical fiber, a rotary tool, and a cutting apparatus having the rotary tool, and more particularly, to cut / cut a workpiece such as a plastic optical fiber. The present invention relates to a cutting / cutting method for a workpiece that uses a rotary tool for cutting, a rotary tool for performing the cutting / cutting method, and a cutting apparatus having the rotary tool.

About the cutting method and cutting apparatus of a plastic optical fiber (POF: plastic optical fiber), it describes in the following patent documents 1-4.
Patent Document 1 describes a method of cutting a plastic optical fiber inserted through a base along the end face of the base with a heating blade.
Patent Document 2 describes a method of forming a cut surface of a plastic optical fiber by performing cutting a plurality of times using an ultrasonic cutter.

Patent Document 3 describes a method in which the cutting axis of the cutting blade is aligned with the central axis of the plastic optical fiber, and the end surface of the plastic optical fiber is applied to the cutting edge of the cutting blade for cutting.
Patent Document 4 describes a cutting device that heats a disc-shaped cutting blade rotated by a motor and cuts a plastic optical fiber by the outer peripheral blade surface. One surface of the cutting blade is a plastic optical fiber at the time of cutting. The cutting surface is cut.
JP 7-294748 A JP 2003-48191 A JP 2003-172829 A JP 2003-57451 A

However, the above conventional description has the following problems.
First, as described in Patent Document 1, the plastic optical fiber cutting method using a heating blade requires temperature control of the cutting blade in order to keep heat constant. Further, the heating causes inconveniences such as deformation of portions other than the end face of the plastic optical fiber and deterioration of optical characteristics inside the optical fiber. Furthermore, it takes time to heat the blade.
In the method using an ultrasonic cutter as described in Patent Document 2, since the cutting resistance is high, burrs are likely to occur in the coated portion.

Moreover, the cutting method described in Patent Document 3 does not cut a workpiece such as a plastic optical fiber.
Furthermore, as described in Patent Document 4, it is difficult to adjust the heating temperature in the plastic optical fiber cutting method using a cutting blade that is rotated while being heated. For example, when the heating temperature is increased, the resin constituting the optical fiber is fused and the cutting resistance is increased. On the other hand, when the heating temperature is decreased, the degree of softening of the plastic optical fiber is decreased and the cutting resistance is increased. When the control of the heating temperature deviates from the optimum value, the plastic optical fiber coating material, the core material, and the clad material are fused to the cut surface of the optical fiber or a burr is generated in the optical fiber.

For example, when the temperature of the cutting blade of the plastic optical fiber 101 becomes lower than the optimum value, PM
Burr 103 as shown in FIG. 14A is formed on the coating made of MA (polymethyl methacrylate).
Will occur. Further, when the temperature of the cutting blade of the plastic optical fiber 101 becomes higher than the optimum value, for example, as shown in FIG. 14B, the core material, the clad material PA (polyamid) and the coating material PMMA are fused. The cross section shown in FIGS. 14A and 14B is drawn with reference to the photograph of the cut surface.
In addition, if the core and clad are chipped by cutting the plastic optical fiber, the connection loss increases.

An object of the present invention is to provide a method for cutting and cutting a workpiece capable of improving the cross-sectional shape of the workpiece such as the coating, core and cladding of the plastic optical fiber, and the cross-sectional shape of the plastic optical fiber. It is an object to provide a plastic optical fiber cutting / cutting method that can be improved.

In order to solve the above-described problems, a cutting / cutting method of a workpiece according to the present invention is performed by cutting or cutting a workpiece by cutting or cutting the workpiece with a rotary tool having a cutting blade on an outer peripheral portion of a rotating body. In the method
The cutting blade has a cutting edge, and the cutting edge includes a sharp portion having one point protruding sharply in at least one direction parallel to the rotation axis of the rotating body,
By rotating the rotating body, the cutting edge of the cutting blade is brought into line contact with the workpiece, the workpiece is cut by the cutting edge width of the cutting edge, and only the sharp portion having the one point is drawn. The side surface of the workpiece is mirror-finished on a surface along a locus.
Thereby, the cross-sectional shape of a workpiece can be made favorable. Since the workpiece can be cut with the blade width of the cutting blade, for example, when the workpiece is a wire, cutting the wire only requires moving the blade or wire by the wire thickness, such as polishing and deburring. Cutting and cutting surfaces can be finished to a mirror surface by only primary processing without performing secondary processing.

In the method for cutting and cutting a workpiece according to the present invention, preferably, the cutting edge of the cutting blade has one point projecting sharply from both sides in a direction parallel to the rotation axis along the direction of the rotation axis. Comprising the sharpened portion having
By rotating the rotating body, the cutting edge of the cutting blade is brought into line contact with the workpiece, the workpiece is cut with the cutting edge width of the cutting edge, and only the sharp portions on both side portions are drawn. The side surface of the workpiece is mirror-finished with two surfaces along the trajectory.
As a result, both sides of the cut wire can be mirror finished at the same time.

  In the method for cutting and cutting a workpiece according to the present invention, preferably, the front shape of the cutting blade is wide at the cutting edge, and the width is narrowed from the cutting edge toward the center of the rotating body. A clearance angle and a rake angle are formed at a side end of the cutting edge and a side shape portion of the cutting blade.

  The method of cutting and cutting a workpiece according to the present invention is preferably characterized in that the cutting blade cuts the workpiece and passes it to mirror-process both the side surfaces and the bottom surface of the workpiece at the same time. To do.

  The method for cutting and cutting a workpiece of the present invention is preferably characterized in that a plastic optical fiber is cut or cut as the workpiece.

  The method for cutting and cutting a workpiece according to the present invention is characterized in that a tension is applied to the plastic optical fiber when the plastic optical fiber is cut or cut.

  The work cutting / cutting method of the present invention is preferably characterized in that a radius R of the sharp part of the cutting edge of the rotary tool is 0.002 mm or more and 0.01 mm or less.

  In the workpiece cutting / cutting method of the present invention, preferably, the rotational speed of the rotary tool is 5000 rpm or more and 10,000 rpm or less.

  The workpiece cutting / cutting method of the present invention is preferably characterized in that a relative feed rate between the rotary tool and the workpiece is 5 mm / s or more and 20 mm / s or less.

  The method for cutting and cutting a workpiece of the present invention is preferably characterized in that the material of the cutting edge of the cutting blade is diamond.

The rotary tool of the present invention is a rotary tool for cutting or cutting a workpiece,
A rotating body,
A cutting blade provided on an outer peripheral portion of the rotating body, the cutting blade including a sharpened portion having one point protruding sharply in at least one direction of a side portion in a direction of a rotation axis of the rotating body, and rotating the rotating body By cutting the workpiece, the cutting edge is brought into line contact with the workpiece, the workpiece is cut with a blade width, and the workpiece is cut along a plane drawn only by the sharp portion having the one point. The cutting blade for mirror-finishing the side surface of the above.

  Thereby, the cross-sectional shape of a workpiece can be made favorable. Since the workpiece can be cut with the blade width of the cutting blade, for example, when the workpiece is a wire, cutting the wire only requires moving the blade or wire by the wire thickness, such as polishing and deburring. Cutting and cutting surfaces can be finished to a mirror surface by only primary processing without performing secondary processing.

The cutting device having the rotary tool of the present invention is a cutting device having a rotary tool for cutting or cutting a workpiece.
A rotating device;
A rotating tool rotated by a rotating shaft of the rotating device,
The rotary tool is
A rotating body mounted on the rotating shaft;
A cutting blade provided on an outer peripheral portion of the rotating body, the cutting blade including a sharpened portion having one point protruding sharply in at least one direction of a side portion in a direction of a rotation axis of the rotating body, and rotating the rotating body By cutting the workpiece, the cutting edge is brought into line contact with the workpiece, the workpiece is cut with a blade width, and the workpiece is cut along a plane drawn only by the sharp portion having the one point. The cutting blade for mirror-finishing the side surface of the above.

Thereby, the shape of the cross section of a workpiece can be made favorable by rotating a rotary tool with a rotating device. Since the workpiece can be cut with the blade width of the cutting blade, for example, when the workpiece is a wire, cutting the wire only requires moving the blade or wire by the wire thickness, such as polishing and deburring. Cutting and cutting surfaces can be finished to a mirror surface by only primary processing without performing secondary processing.

According to the present invention, in order to cut and cut the workpiece with the cutting blade provided on the outer peripheral portion of the rotating body, the cutting edge of the cutting blade is brought into contact with the workpiece by the rotation of the rotating body. In addition, the workpiece is cut and cut along a surface along a trajectory drawn by only one point protruding sharply from the side portion in the longitudinal direction of the rotating shaft of the rotating body.

According to this, the cutting surface or cutting surface of the workpiece becomes a surface equal to the locus drawn by only one point protruding sharply from the side where the cutting blade is located, and the surface roughness of the surface is reduced,
It becomes possible to prevent burr due to cutting, sagging or chipping due to fusion, and improve the cross-sectional shape of the workpiece.

  Therefore, no finishing process is required after cutting. For example, by applying to cutting / cutting of a plastic optical fiber, the appearance inspection of the cut surface and the transmission measurement of the cut plastic optical fiber can be omitted, and the cutting process can be shortened, so that productivity is improved.

Fig.1 (a) is a top view which shows the rotary tool used for the cutting and cutting method of the workpiece based on embodiment of this invention example, FIG.1 (b) is the II line | wire of the same figure (a). It is sectional drawing.

A rotary tool 1 shown in FIG. 1 has a substantially disc-shaped rotary body 2 having a shaft hole 2a at the center, and a cutting blade 3 attached on the outer periphery of the rotary body 2. The rotating body 2 includes a straight portion 2b cut parallel to the tangential direction, and a positioning portion 2c extending vertically from one end of the straight portion 2b to reach the outer periphery. The straight portion 2b and the positioning portion In consideration of the balance of the rotating body, 2c is provided at two points symmetrical with respect to the rotation center axis.

For balance of the rotating body, dynamic balance such as providing a balance weight 4 on the outer peripheral edge of the rotating body 2 or the front or back surface of the rotating body 2 may be adopted. The balance weight 4 is attached so as to be closer to the center axis than the rotation trajectory of the cutting edge 32 of the cutting blade 3.

A shaft hole 2a provided at the center of the rotating body 2 is provided with a rotating shaft 43 such as a motor of a rotating mechanism described later.
It is formed in a size that fits in The diameter of the rotating body 2 is preferably not too large in order to reduce the burden on the rotating mechanism. In addition, the material constituting the rotating body 2 is lighter, has a higher hardness, has a lower coefficient of thermal expansion, and is easier to process because it reduces the load on the rotating mechanism and facilitates the mounting of the cutting blade 3. desirable.

The cutting blade 3 is made of a wear-resistant material such as diamond (single crystal, sintered), high speed steel, ceramic, etc., and it is particularly desirable to use diamond. The cutting blade 3 is attached to a portion where the linear portion 2b and the positioning portion 2c of the rotating body 2 intersect. The attachment may be provided so as not to be removable, such as a brazing method or a method of fixing using an adhesive, or may be provided so as to be removable, such as a screwing method. Also good.

Further, as illustrated in the front view of FIG. 2A, the cutting blade 3 is substantially attached to the rotating shaft of the rotating body 2 on the side opposite to the mounting portion 31 and the mounting portion 31 attached to the rotating body 2. While having the blade edge | tip 32 arrange | positioned in parallel and the front flank (flank) 33 which comprises the front surface of the area | region from the attachment part 31 to the blade edge | tip 32, as shown to the side view of FIG.2 (b), A rake face 34 that extends rearward from the cutting edge 32 at the lower part of the front flank 33 and inclines so as to approach the attachment portion 31 side, and a back tapered face 3 formed rearward from both sides of the cutting blade 3 and the front flank 33.
5. The width of the front flank 33 is closer to the attachment portion 31, that is, the rotating body 2
It is formed so that the width gradually narrows as it approaches the rotation axis 43.

As a result, the cutting edge 32 of the cutting blade 3 has an acute angle with respect to the front flank 33, the rake face 34 and the back taper surface 35, and both ends of the cutting edge 32 become sharp parts, and the sharp part is substantially one piece. It has become a point.
Next, the sizes of the rotating body 2 and the cutting blade 3 will be described with specific examples.
The thickness a around the shaft hole 2a of the rotating body 2 is 2 mm, for example, and is preferably equal to or greater than the thickness of the cutting blade 3. This is because if the thickness a is thinner than the cutting blade 3, the strength of the rotating body 2 decreases.

The dimension b of the cutting edge 32 of the cutting blade 3 is preferably 1 mm or less. Its dimension b
Because the cutting width of the workpiece, for example, plastic optical fiber, changes due to
This is because the smaller the value, the smaller the cutting amount. Also, as shown in FIG. 2A, the angle θ ₁ of both side edges of the front flank surface 33, that is, the back taper surface 35 with respect to the cutting edge 32 is less than 90 °, for example, an acute angle of 89 °. This is because when the angle θ ₁ is 90 °, when the workpiece is cut, the contact area with the cut surface increases, and the cutting resistance increases. Therefore, in the front flank 33, the blade edge 32 is widest, both ends of the blade edge 32 are sharp, and the tip is in one point.

Further, in FIG. 2B, an angle θ ₂ formed by a line vertically extending from the surface of the attachment portion 31 of the cutting blade 3 toward the blade edge 32 and the front flank surface 33 is set to 0 ° or more, and the attachment portion The angle θ ₃ formed by the surface 31 and the rake surface 34 is 5 to 20 °. If the angle θ ₃ is too small, the contact area with the object to be cut, for example, a plastic optical fiber, becomes large. Therefore, the larger the angle, the better for reducing the contact resistance. The angle between the surface opposite to the front flank surface 33 and the surface of the attachment portion 31 is, for example, 90 °.
It is. The angle formed by the front flank 33 and the rake face 34 is an acute angle.

The height of the cutting blade 3, that is, the blade length h is, for example, 1.8 mm. When the object to be cut is a plastic optical fiber, it is preferably longer than its diameter. However, if the length is too long, the load on the rotating mechanism increases, and the blade length h is appropriately selected. Further, the dimension d in the front-rear direction of the rake face 34 is preferably 1 mm or more, and if it is too small, the strength is weak and there is a risk that the blade may be broken due to resistance during cutting. Furthermore, the dimension e of the attachment part 31 of the cutting blade 3 is 1.2 mm, for example.

The rotary tool 1 having the rotating body 2 and the cutting blade 3 as described above is, for example, with respect to the distal end portion of the rotating shaft 43 of the rotating device 42 installed on the mounting table 41 of the cutting device 40 as shown in FIG. Removably attached.

  In the example of FIG. 3, a plastic optical fiber P is a preferable example of a workpiece to be cut. The plastic optical fiber P is attached substantially parallel to the rotation shaft 43 on the POF fixing portion 44 of the moving stage 45 installed on the mounting table 41. In the POF fixing portion 44, a clamp 46 having a groove for sandwiching the plastic optical fiber P is attached. The rotating device 42 and the mounting table 41 have not only the direction of the rotation axis of the rotation shaft 43 and the direction parallel to the rotation axis 43 but also a mechanism that relatively moves toward and away from and changes the moving position.

  Further, the rotating device 42 and the mounting table 41 have a mechanism that can change the angle of the rotating shaft 43 of the rotating device 42 relative to a soft body that is an object of cutting and cutting. The angle is 0 to 45 degrees with respect to the rotation axis 43 with respect to the central axis of the plastic optical fiber when the soft body is a plastic optical fiber.

When the rotating device 42 is driven, the rotating shaft 43 rotates, and accordingly, the rotating tool 1 rotates around the shaft hole 2a. As shown in FIG. 4A, the rotation direction of the rotary tool 1 is such that the cutting edge 32 of the cutting blade 3 attached to the rotating body 2 passes through the plastic optical fiber P to be cut before the back taper surface 34. The direction. Further, when the cutting edge 32 is stopped on the plastic optical fiber P, it comes into line contact. The plastic optical fiber P may be slightly curved.

Then, the cutting blade 3 is rotated by the rotating device 42, and as shown in FIG.
When the blade 32 of the cutting blade 3 attached to the plastic optical fiber P is moved closer to the plastic optical fiber P, and then the rotary body 2 is gradually moved in a direction crossing the plastic optical fiber P, the state shown in FIG. Thus, the cutting edge 32 of the cutting blade 3 cuts the plastic optical fiber P with the blade width,
Finally, as shown in FIGS. 4B and 5B, the plastic optical fiber P is cut.
At the time of cutting, tension is applied to the plastic optical fiber P around the rotating body 2 by the clamps 46 that support the plastic optical fiber P on both sides of the cutting blade 3.

In the cutting process, as shown in FIG. 5 (a), the cut surface of the plastic optical fiber P continues to contact the sharp side edges of the cutting edge 32 at one point. The cutting resistance is low, and the cutting surface is caught by the cutting edge 32 and hardly changes. As a result, the generation of burrs in the coating of the plastic optical fiber P and the coating hardly adhere to the cut surface. In addition, the three surfaces of the side surface (cutting surface) of the plastic fiber P positioned on both sides of the blade edge 32 and the bottom surface (cutting surface) where the blade edge 32 comes into line contact are both mirror surfaces, and the cut surface that appears after cutting is a mirror surface.

The sharp portions at both ends of the cutting edge 32 are substantially in point contact with the cutting surface, and the surface along the miracle drawn by the one point is the cut surface of the plastic optical fiber, that is, the processed surface. Become. The trajectory at a predetermined time of the sharp portions at both ends of the cutting edge 32 on the cut surface is shown in FIG.
As shown by the broken line.

However, the broken line shown in FIG. 6 indicates the longitudinal direction of the rotation axis of the rotary tool 1 and the plastic optical fiber P.
Is the locus of the cutting edge 32 when the rotary tool 1 is moved in a direction in which the central axes of the two are arranged in parallel and approached at the shortest distance.

In order to cut the plastic optical fiber P with the cutting blade 3, a rotating blade tip 32 is used.
It is necessary to pass the plastic optical fiber P through the orbit. As a method for the passage, as illustrated in FIG. 7, the rotating body 2 is supported at a predetermined position without moving up and down, left and right, and the moving stage 45 is moved to move the plastic optical fiber P to the cutting edge 32 of the cutting blade 3. As illustrated in FIG. 8, the rotating body 2 is lowered toward the plastic optical fiber P with the moving stage 45 stopped, and the plastic optical fiber P is moved to the cutting edge 32.
There are other methods such as passing through the rotating orbit.

Note that the plastic optical fiber P may be cut and cut while the rotating rotator 2 is reciprocated in the direction intersecting the rotation axis. In this case, the cutting edge 32 on the cut surface of the plastic optical fiber P is used. The trajectory of one point on the side edge for each predetermined time is as shown by the broken line in FIG.
By the way, during the cutting and cutting of the plastic optical fiber P by the cutting blade 3, the cutting blade 3
The shape of the cut surface can be changed by changing the position of at least one of the moving stage 45 and moving the stick optical fiber P in the longitudinal direction.

For example, when the plastic optical fiber P is cut with the rotated cutting blade 3, when the central axis of the plastic optical fiber P and the rotation axis of the rotating body 2 are relatively inclined, the cut surface of the cross section is shown in FIG. It becomes an elliptical shape as shown in FIG. When the plastic optical fiber P is cut by the rotated cutting blade 3, the central axis of the plastic optical fiber P and the rotating body 2
When the plastic optical fiber P is cut by inclining in the opposite direction and cutting it halfway and then cutting to the end by cutting the plastic optical fiber P relatively, the one of the cut surfaces is shown in FIG.
The wedge-shaped and substantially V-shaped cross-section as shown in FIG. Further, in the process of cutting the plastic optical fiber P with the rotated cutting blade 3, the central axis of the plastic optical fiber P and the rotational axis of the rotating body 2 are relatively inclined in one direction so that the plastic optical fiber P is 1 / After cutting up to 3, the central axis of the plastic optical fiber P and the rotational axis of the rotating body 2 are arranged in parallel, and after further cutting the plastic optical fiber P by 1/3, the central axis of the plastic optical fiber P A plastic optical fiber P is formed by tilting the rotation axis of the rotator 2 in a relatively opposite direction.
When the remaining 1/3 is cut and cut, one of the cut surfaces has a substantially trapezoidal cross-sectional shape as shown in FIG.

In this way, the plastic optical fiber P is moved in the longitudinal direction, radial direction, axial direction,
Alternatively, the angle between the longitudinal direction of the plastic optical fiber P and the rotation center axis of the cutting blade 3 is 0 °.
By tilting more greatly, the cut surface of the plastic optical fiber P can be formed into a desired shape. The angle is changed by providing a mechanism for changing at least one angle of the POF fixing portion 44 including the clamp 46 and the rotating device 42.
The two cut surfaces of the plastic optical fiber P as described above are both in a mirror state.

As an indication of the mirror surface, a surface roughness (Ra) of 1.0 μm or less can be obtained.
The surface roughness is due to the locus of one point of the sharp portion 36 at both ends of the cutting edge 32 that cuts the plastic optical fiber. Further, no burrs are generated on the surface of the plastic optical fiber P due to cutting. Further, the PA resin and PMMA resin constituting the plastic optical fiber are not fused.

Since the cutting resistance can be reduced by using the blade of the present invention, a good cutting surface is obtained regardless of whether or not cooling water is used when cutting the metal-containing solution with the rotary tool 1. be able to.
The number of rotations of the cutting blade 3 when cutting with the rotary tool 1 is, for example, 5000 rpm or more, and the feed rate when cutting the plastic optical fiber obliquely is in the range of 20 mm / sec or less. At the time of cutting, it is preferable to increase the feed rate when the rotational speed of the cutting blade 3 is increased.

The surface roughness of the cut surface of the plastic optical fiber according to the conditions is 1.0 μm or less, and the optical transmission loss due to this is 1 dB or less. The optical transmission loss is measured with a power meter.
In that case, no burrs or chips occurred in the cross section of the plastic optical fiber. Of course, since the heat treatment was not performed, the constituent materials were not fused. In addition, the optical transmission characteristics of the plastic optical fiber are not deteriorated even in the cut state, the inspection cost can be reduced, and the product specification can be nearly 100%.

  Moreover, since both ends of the cutting edge of the cutting blade 3 are sharpened portions 36 and the plastic optical fiber, which is a soft body, is cut by the both ends, the cut surfaces on both sides of the cutting blade 3 can be processed into a mirror surface at the same time. Improves.

  When diamond is used as the material of the cutting edge 32 of the cutting blade 3, the durability is increased, and the surface roughness of the cut surface is maintained at 1.0 μm or less even when the plastic optical fiber is cut at 100,000 / sheet or more. In particular, when diamond is used as the material of the cutting edge 32, single crystal diamond is desirable.

FIG. 14 shows the radius R at the cutting edge 36 of the cutting blade 3 of the rotary tool 1.
As shown in FIG. 14, the radius R of the sharpened portion 36 of the blade edge 32 is preferably 0.002 mm or more and 0.01 mm or less, and most preferably 0.005 mm. By setting the radius R of the sharp portion 36 of the blade tip 32 in this way, the cutting blade 3 cuts the plastic optical fiber P with the sharp portion 36 formed at one point and cuts the plastic optical fiber P. A trajectory drawn with only one point is created on the side.

  If the radius R of the tip of the sharpened portion 36 of the blade tip 32 is less than 0.002 mm, it is difficult to process the sharpened portion 36 of the bladed tip 32 and the sharpened portion 36 is likely to be chipped. Further, if the radius R of the tip of the sharpened portion 36 of the blade edge 32 exceeds 0.01 mm, it is not preferable because it is difficult to mirror-process the side surface of the plastic optical fiber P.

  As for the rotation speed of the rotary tool 1, it is desirable that it is 5000 rpm or more and 10,000 rpm or less. By setting the number of rotations of the rotary tool 1 in this way, for example, the plastic optical fiber P can be reliably cut and cut.

  If the rotational speed of the rotary tool 1 is less than 5000 rpm, for example, when the plastic optical fiber P is intermittently cut using a single cutting blade 3 as shown in FIG. 1, sufficient centrifugal force cannot be obtained. This is not preferable because the shape of the cross section of the plastic optical fiber P may not be improved. Further, when the rotational speed of the rotary tool 1 exceeds 10,000 rpm, the heat generated between the cutting blade of the rotary tool 1 and the workpiece increases, which affects the plastic optical fiber P and causes the side surface of the plastic optical fiber P to be affected. This is not preferable because there is a possibility that the mirror finish cannot be obtained.

  Moreover, when setting the rotation speed of the rotary tool 1 mentioned above, the relative feed rate of the rotary tool 1 and the workpiece, for example, the plastic optical fiber P, is 5 mm / s or more and 20 mm / s or less. By setting the relative feed speed in this manner, the cross-sectional shape of the plastic optical fiber P can be reliably improved.

If the relative feed rate is less than 5 mm / s, the cutting workability of the plastic optical fiber P is lowered, which is not preferable. If the relative feed rate exceeds 20 mm / s, the heat generated between the cutting blade of the rotary tool 1 and the workpiece increases, which affects the plastic optical fiber P and causes the plastic optical fiber P to Since there is a possibility that the mirror processing of the side surface may not be obtained, it is not preferable.
As an example, when the rotational speed of the rotary tool 1 is set to 5000 rpm and the feed rate exceeds 20 mm / s, the optical transmission loss of the plastic optical fiber P becomes 1 dB or more.

By the way, although the above-mentioned cutting blade 3 demonstrated the example attached to the rotary body 2, two or more may be sufficient and it arrange | positions in consideration of a rotary body balance in that case. An example in which two rotary tools 1 are attached to the rotary body 2 is shown in FIG.
Moreover, the taper surface formed in the side part of the cutting blade 3 is not both sides, FIG. 12 (a), (b).
As shown in FIG. FIG. 12A shows a first cutting blade 3A in which a tapered surface 35 is provided only on one side of the front flank 33 and a sharpened portion 36 is formed only on one side, and FIG.
These are the 2nd cutting blade 3B which provided the taper surface 35 only in the other side of the front flank 33, and formed the sharpened part 36 only in the other side.

As shown in FIG. 12C, the first and second cutting blades 3A and 3B are attached to the rotating body 2 with the front flank 33 at the front side in the rotation direction. Thereby, the sharp part 36 of the first cutting blade 3A.
Is arranged on the one surface side of the rotating body 2, and the sharpened portion 36 of the second cutting blade 3B is arranged on the other surface side of the rotating body 2. In this case, one of the cut surfaces of the plastic optical fiber is a surface formed along the locus of one point of the sharpened portion 36 of the first cutting blade 3A, and the other of the cut surfaces is the second cutting blade 3B. It is a surface formed along the locus of one point of the sharp part 36.

  In the embodiment of the present invention, when cutting or cutting the plastic optical fiber P which is a workpiece by the rotary tool 1 having the cutting blade 3 on the outer peripheral portion of the rotating body 2, the cutting blade 3 has a cutting edge 32, The cutting edge 32 is provided with a sharp portion 36 having one point protruding in at least one direction parallel to the rotation axis 43 of the rotating body 2, and the cutting edge 3 of the cutting blade 3 is made of plastic by rotating the rotating body 2. The plastic optical fiber P is cut with the blade width of the cutting edge 32 by making line contact with the optical fiber P, and the side surface of the plastic optical fiber P is mirror-finished along the surface drawn only by the sharp portion 36 having the one point.

  Thereby, the cross-sectional shape of the plastic optical fiber P can be made favorable. Since the plastic optical fiber P can be cut with the blade width of the cutting blade 32, for example, in the cutting of the plastic optical fiber P which is an example of the wire, it is only necessary to move the blade or the wire by the thickness of the wire. Cutting and cutting surfaces can be finished to mirror surfaces only by primary processing without performing secondary processing.

  In the embodiment of the present invention, the cutting edge 32 of the cutting blade 3 includes sharp portions 36, 36 each having a single point projecting sharply from both sides in a direction parallel to the rotation shaft 43 along the direction of the rotation shaft 43. By rotating the rotating body 2, the cutting edge 3 of the cutting blade 3 is brought into line contact with the plastic optical fiber P, and the plastic optical fiber P is cut with the cutting edge width of the cutting edge 32, and the sharp portions 36, 36 on both sides thereof are cut. The side surface of the plastic optical fiber P is mirror-finished with two surfaces along the locus drawn only by the above. Thereby, in the cutting | disconnection of the plastic optical fiber P which is an example of a wire, both cut surfaces can be finished into a mirror surface simultaneously.

  In the embodiment of the present invention, the front shape of the cutting blade 3 is wide at the blade tip 32, and the width becomes narrower from the blade tip 32 toward the center of the rotating body 2, and the sharpened portion 36 is formed at the side edge of the blade tip 32. And the clearance angle and the rake angle are formed in the side shape part of the cutting blade 3. Thereby, the side surface of the plastic optical fiber P which is an example of a wire can be smoothly finished into a mirror surface at the time of cutting.

  In the embodiment of the present invention, the cutting blade 3 is characterized in that the plastic optical fiber P is cut and passed to simultaneously mirror-finish the three surfaces of both side surfaces and the bottom surface. Thereby, the bottom surface and both side surfaces of the plastic optical fiber P, which is an example of a wire, can be smoothly finished into a mirror surface during cutting.

  In the embodiment of the present invention, for example, when the plastic optical fiber P is cut or cut, tension is applied to the plastic optical fiber P. Thereby, the plastic optical fiber P can be cut by cutting the plastic optical fiber P so as not to loosen, and the cross-sectional shape of the plastic optical fiber P can be improved.

  In the embodiment of the present invention, the material of the cutting edge 32 of the cutting blade 3 is diamond. Thereby, the durability of the cutting edge 32 of the cutting blade 3 is increased, and the surface roughness of the cut surface of, for example, the plastic optical fiber P that is a workpiece can be maintained at 1.0 μm or less.

  In the embodiment of the present invention, one cutting blade 3 and one balance weight 4 are provided for the rotating body 2 of the rotary tool 1, or two cutting blades 3 are provided for the rotating body 2 of the rotating tool 1. By providing, not only the vibration of the cutting blade 3 is suppressed by obtaining a dynamic balance when the rotary tool 1 is rotated, but the rotary tool 1 generates wind to cut the rotary tool 1 that generates heat by cutting and cutting. The blade 3 and the workpiece can be cooled.

  In the embodiment of the present invention, the rotary tool 1 does not need to use a cutting fluid such as water when cutting the workpiece, and therefore, a drying process for drying the cutting fluid is unnecessary.

The present invention is not limited to the above embodiment, and includes various modifications.
For example, according to the cutting blade and the cutting device of the present invention, the workpiece may be a wire or other shapes. The workpiece can be used for processing not only a plastic optical fiber which is an example of a wire, but also other soft materials such as acrylic and nylon, and other types of workpieces. The numerical value of the radius R of the tip of the blade edge can be applied to each of the above-described embodiments.

FIG. 1 is a front view and a cross-sectional view illustrating an example of a rotary tool according to an embodiment of the present invention. Drawing 2 is a front view and a side view showing an example of a cutting blade attached to a rotary tool concerning an embodiment of the present invention. FIG. 3 is a plan view showing an example of the soft body cutting device according to the embodiment of the present invention. FIG. 4 is a perspective view showing the cutting operation of the plastic optical fiber by the rotary tool according to the embodiment of the present invention. FIG. 5 is a front view showing the cutting operation of the plastic optical fiber by the rotary tool according to the embodiment of the present invention. FIG. 6 is a cross-sectional view showing a first example of the movement trajectory of the cutting edge on the cut surface of the plastic optical fiber cut by the rotary tool according to the embodiment of the present invention. FIG. 7 is a side view showing a first example of movement of the rotary tool and the plastic optical fiber when the plastic optical fiber is cut by the rotary tool according to the embodiment of the present invention. FIG. 8 is a side view showing a second example of movement of the rotary tool and the plastic optical fiber when the plastic optical fiber is cut by the rotary tool according to the embodiment of the present invention. FIG. 9 is a cross-sectional view showing a second example of the movement trajectory of the cutting blade end on the cut surface of the plastic optical fiber cut by the rotary tool according to the embodiment of the present invention. FIG. 10 is a perspective view showing first to third examples of the cut surface of the plastic optical fiber cut by the rotary tool according to the embodiment of the present invention. FIG. 11 is a front view and a cross-sectional view illustrating another example of the rotary tool according to the embodiment of the present invention. FIG. 12 is a front view and a sectional view showing still another example of the rotary tool according to the embodiment of the present invention. FIG. 13 is a diagram showing a radius R at the cutting edge of the cutting blade of the rotary tool according to the embodiment of the present invention. FIG. 14 is a front view showing a cut surface of a plastic optical fiber by a conventional cutting blade.

Explanation of symbols

1: Rotating tool 2: Rotating body 2a: Shaft hole 3: Cutting blade 31: Mounting portion 32: Cutting edge 33: Front flank 34: Rake surface 35: Back taper surface 36: Sharpened portion 40: Cutting device 41: Mounting table 42: Rotating device 43: Rotating shaft 44: POF fixed part 45: Moving stage 46: Sharp point P: Plastic optical fiber (an example of a workpiece)

Claims (12)

In the workpiece cutting / cutting method of cutting or cutting the workpiece with a rotary tool having a cutting blade on the outer periphery of the rotating body,
The cutting blade has a cutting edge, and the cutting edge includes a sharp portion having one point protruding sharply in at least one direction parallel to the rotation axis of the rotating body,
By rotating the rotating body, the cutting edge of the cutting blade is brought into line contact with the workpiece, the workpiece is cut by the cutting edge width of the cutting edge, and only the sharp portion having the one point is drawn. A method of cutting and cutting a workpiece, wherein the side surface of the workpiece is mirror-finished along a surface along a trajectory. The cutting edge of the cutting blade includes the pointed portion having one point projecting sharply from both sides in a direction parallel to the rotation axis along the direction of the rotation axis,
By rotating the rotating body, the cutting edge of the cutting blade is brought into line contact with the workpiece, the workpiece is cut with the cutting edge width of the cutting edge, and only the sharp portions on both side portions are drawn. The method of cutting and cutting a workpiece according to claim 1, wherein the side surface of the workpiece is mirror-finished with two surfaces along the trajectory.   The front shape of the cutting blade is wide at the cutting edge, the width is narrowed from the cutting edge toward the center of the rotating body, the sharpened portion is formed at a side edge of the cutting edge, and 3. The workpiece cutting / cutting method according to claim 1, wherein a relief angle and a rake angle are formed in the shape portion.   The said cutting blade cuts and passes the said workpiece, and mirror-finishes three surfaces of the both sides | surfaces and the bottom face of the said workpiece simultaneously, The Claim 1 thru | or 3 characterized by the above-mentioned. Cutting and cutting method for workpieces.   The method for cutting and cutting a workpiece according to any one of claims 1 to 4, wherein a plastic optical fiber is cut or cut as the workpiece.   6. The method for cutting and cutting a workpiece according to claim 5, wherein tension is applied to the plastic optical fiber when the plastic optical fiber is cut or cut.   The cutting radius of the workpiece according to any one of claims 1 to 6, wherein a radius R of the sharp portion of the cutting edge of the rotary tool is not less than 0.002 mm and not more than 0.01 mm. -Cutting method.   The work cutting / cutting method according to any one of claims 1 to 7, wherein the rotational speed of the rotary tool is not less than 5000 rpm and not more than 10,000 rpm.   The method for cutting and cutting a workpiece according to claim 8, wherein a relative feed speed between the rotary tool and the workpiece is 5 mm / s or more and 20 mm / s or less.   The method for cutting and cutting a workpiece according to any one of claims 1 to 9, wherein a material of the cutting edge of the cutting blade is diamond. In a rotary tool for cutting or cutting a workpiece,
A rotating body,
A cutting blade provided on an outer peripheral portion of the rotating body, the cutting blade including a sharpened portion having one point protruding sharply in at least one direction of a side portion in a direction of a rotation axis of the rotating body, and rotating the rotating body By cutting the workpiece, the cutting edge is brought into line contact with the workpiece, the workpiece is cut with a blade width, and the workpiece is cut along a plane drawn only by the sharp portion having the one point. And a cutting tool for mirror-finishing the side surface of the rotary tool. In a cutting device having a rotary tool for cutting or cutting a workpiece,
A rotating device;
A rotating tool rotated by a rotating shaft of the rotating device,
The rotary tool is
A rotating body mounted on the rotating shaft;
A cutting blade provided on an outer peripheral portion of the rotating body, the cutting blade including a sharpened portion having one point protruding sharply in at least one direction of a side portion in a direction of a rotation axis of the rotating body, and rotating the rotating body By cutting the workpiece, the cutting edge is brought into line contact with the workpiece, the workpiece is cut with a blade width, and the workpiece is cut along a plane drawn only by the sharp portion having the one point. A cutting apparatus having a rotary tool, comprising: the cutting blade for mirror-finishing the side surface of the cutting tool.

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