JP2017154936A - Cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting tool 100 for a glass sheet S2 having high cutting performance, while having a simple constitution.SOLUTION: In a cutting tool 100 including a rotating shaft body 5, and a first blade 41 provided on the shaft body 5, and constituted so as to cut a glass sheet S2, while the first blade 41 is pushed onto the end surface of the glass sheet S2 and rotated, the odd number of first blades 41 are provided on the shaft body 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting tool that cuts and cuts a glass plate or a synthetic plate of a glass plate and a resin plate.

As shown in Patent Document 1, a cutting tool for cutting a hard and brittle material (for example, a glass plate), which is a difficult-to-cut material, has been developed by the present inventor.
The cutting tool disclosed in Patent Document 1 is provided with a plurality of curved cutting edges at the tip of the shank 1, and the rotating cutting edge cuts a thin glass plate from its end face.

  However, recently, ultrathin glass plates (for example, about 30 μm thick) that are more difficult to cut have been developed, and it is required to further improve the machinability of this type of cutting tool.

JP2013-111958A

  It is well known that vibration suppression is a major issue in general cutting, and especially for difficult-to-cut materials such as glass plates, vibration suppression is the biggest point to avoid cracking and improve machinability. It becomes.

  Conventionally, it has been considered that vibrations can be suppressed as the number of blades increases as long as there is no problem such as resonance. (However, if there are too many blades, chips are clogged between the blades. There is an upper limit on the number of blades because cutting performance deteriorates due to cutting with chips and manufacturing of a cutting tool becomes difficult.

  In contrast to this common sense, the inventors of the present invention have made extensive studies and as a result, in a rotary cutting tool that cuts a glass plate from its end face, even when the number of blades is small, vibration during cutting can be suppressed, and cutting performance can be reduced. We found for the first time that it could be improved.

  Specifically, odd-numbered blades have less vibration than even-numbered blades even when the number of blades is small, and according to actual experiments, depending on the diameter of the shaft and the number of rotations. The inventor of the present application has found that, when the number of blades is a prime number, such as 11, 13, 17, 19, etc., cutting is performed more suitably.

  The present invention has been made on the basis of such knowledge, and a main intended problem thereof is to provide a cutting tool for a glass plate that has a simple configuration and high cutting performance.

  That is, the present invention includes a rotating shaft body and a first blade provided on the shaft body, and the first blade rotates while being pressed against an end surface of the glass plate to cut the glass plate. The cutting tool configured as described above is characterized in that an odd number of first blades are provided on the shaft body.

As a specific effective number of blades, the number of the first blades is preferably 3 or more and 19 or less.
As described above, if the number of the first blades is a prime number, vibration can be more suitably suppressed.
And when such a cutting tool is used, it will be difficult to cut conventionally, and it becomes possible to cut an extremely thin glass plate that has been difficult to process.

  By the way, the ultra-thin glass plate may be provided as a laminated plate that is affixed to both the front and back surfaces of a resin plate or one surface thereof, is light and yet bendable.

  As a specific aspect of the cutting tool for cutting such a laminated plate, a second blade is provided in a region adjacent to the axial direction of the region where the first blade in the shaft body is provided, and the first The blade may be a glass plate, and the second blade may be a resin plate.

In particular, when cutting a laminated plate with glass plates pasted on both sides of a resin plate, the cutting tool is configured by a pair of first blade rows that circulate so as to sandwich the second blade for cutting the resin from the axial direction. Will be.
However, in the case of such a configuration, resin chips may be disturbed by the pair of first blades and not discharged well, and may be hindered by cutting around the second blade.

  In order to solve such a problem, in the shaft body, the portion where the second blade is provided is a side opening hole that coincides with the axial direction and opens at a different position in the circumferential direction, and the tip of the shaft body It is preferable that a front end opening hole 61 opened on the surface is provided, and the side opening hole and the front end opening hole 61 communicate with each other.

  According to this configuration, the resin chips scraped by the second blade are discharged from the front end surface of the shaft body through the discharge path formed by the side surface opening hole and the front end opening hole 61. Troubles caused by chips can be solved without difficulty.

  In order to discharge chips more smoothly, the surface of the peripheral wall surface of the side opening hole that is opposite to the tip surface of the shaft body is directed toward the tip surface side toward the center of the shaft body. It is preferable to be inclined as described above.

  According to the present invention configured as described above, although the number of blades is small, the cutting performance can be improved compared to a cutting tool having a larger number of blades, and the number of blades is smaller. Chip clogging is less likely to occur. Further, since the number of blades can be reduced, the manufacturing cost of the cutting tool itself can be reduced.

The perspective view which shows the front-end | tip part of the cutting tool in one Embodiment of this invention. The front view which shows the front-end | tip part of the cutting tool in the embodiment. The bottom view of the cutting tool in the embodiment. AA line sectional view in FIG. The bottom view showing the cutting mode of the laminated material using the cutting tool in the embodiment. The simulation result which shows the difference in the vibration at the time of cutting by the difference in the number of sheets of the 1st blade.

  Hereinafter, an embodiment of a cutting tool according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the cutting tool 100 includes a transparent resin plate S1 made of, for example, polycarbonate, and transparent ultrathin glass plates (for example, soda lime glass and aluminosilicate) respectively attached to both surfaces thereof. A laminated material S made of acid glass or the like is cut from its end face.

This will be described more specifically.
This cutting tool 100 is composed of a metal bar-shaped shank 1 and a blade portion 2 formed integrally with the tip of the shank 1.
The shank 1 includes a main body 11 having a cylindrical shape with an equal cross section and a tapered portion 12 that extends integrally from the front end of the main body 11 in the axial direction. Attached and configured to rotate about an axis.

  The blade portion 2 includes a shaft body 5 extending in the axial direction from the tip of the tapered portion 12, and a first blade 41 and a second blade 42 provided on a side surface of the shaft body 5.

  The shaft body 5 includes a large-diameter first blade forming portion 51 in which the first blade 41 is formed, and a small-diameter second blade forming portion 52 in which the second blade 42 is formed. In this embodiment, a pair of first blade forming portions 51 are formed so as to sandwich the second blade forming portion 52 from both ends in the axial direction.

  The first blade 41 is for cutting the glass plate S2. Here, a plurality of first blades 41 are arranged on the side peripheral surface of each first blade forming portion 51 at equal intervals in the circumferential direction. Yes.

  The length of the first blade 41 in the axial direction is set to be the same as or slightly longer than the thickness of the glass plate S2, as shown in FIG. Further, the first blade 41 provided in one first blade forming portion 51 is located at the same position (same phase) in the circumferential direction as the first blade 41 provided in the other first blade forming portion 51. It is configured.

  In this embodiment, the rake angle of the first blade 41 is negative (here, about −70 ° or −about 45 °), and the clearance angle is set to about 10 °. When the first blade 41 is viewed from the side (viewed from the tangential direction of the shaft body 5), as shown in FIG. 2, the ridge line of the blade tip is straight and parallel to the axial direction, and viewed from the front. When viewed from the radial direction of the shaft body 5, the ridgeline of the cutting edge is configured to coincide with the axis and form a straight line.

  The second blade 42 is for cutting the resin plate S1, and here, as shown in FIG. 4 in particular, only one is projected from the side peripheral surface of the second blade forming portion 52. The axial lengths of the second blade 42 and the second blade forming portion 52 are set to be the same as the thickness dimension of the resin plate S1.

  In this embodiment, the rake angle of the second blade 42 is set to be positive (here, about 10 °) and the clearance angle is set to about 10 °, and viewed from the side (viewed from the tangential direction of the shaft body 5). The edge of the blade edge is straight and parallel to the axial direction, and when viewed from the front (viewed from the radial direction of the shaft 5), the edge line of the blade edge matches the axis and forms a straight line. It is configured.

  When the laminated material S is cut using the cutting tool 100, the laminated material S is floated and fixed on, for example, a work table, the first blade 41 is the height of the upper and lower glass plates S2, and the second blade 42 is a resin. The height of the cutting tool 100 is adjusted so as to match the height of the plate S1, and while maintaining the height, the cutting tool 100 is moved in the horizontal direction while rotating around the axis, and the end face of the laminate S Press against. Thereby, as shown in FIG. 5, the laminated material S can be cut and cut.

However, the cutting tool 100 of this embodiment is also characterized by the following two configurations in addition to the above configuration.
(1) The number of first blades 41 provided in each first blade forming portion 51 is an odd number.
(2) A discharge path 6 is provided for drawing chips of the resin plate S <b> 1 cut by the second blade 42 into the inside from the side peripheral surface of the shaft body 5 and discharging the chips from the tip end surface of the shaft body 5. about.

First, (1) will be described.
The number of the first blades 41 is an odd number of 11 in this embodiment.
If the number of blades is too large, it takes time to manufacture the cutting tool, and chips may still remain when the next blade arrives, and may be cut by its own chips. The upper limit is about 20 in this embodiment.

On the other hand, conventionally, unless there is a specific reason such as a resonance problem, it is considered that as the number of blades increases, vibration during cutting decreases and cracks and the like can be prevented.
Therefore, it is common knowledge to design a large number of blades within a range that does not cause special problems such as chips and resonance.

However, in the case of glass cutting, as a result of intensive studies by the inventor of the present application, it has been found that an odd number of blades suppresses vibration more than an even number of blades having a larger number of blades.
That is, as can be seen from the simulation results shown in FIG. 6, for example, 13 or 11 blades with fewer blades than those with 14 blades are vibrations in the Y direction (upper graph line). It can be seen that the vibration in the Y direction (lower graph line) is suppressed and at least not increased. Further, even if the number of blades is more than that, the vibration in the Y direction is suppressed more at least in the 15 sheets than the 16 sheets and in the 17 sheets than the 18 sheets, and the vibration in the X direction does not increase. I understand that.
Here, the Y direction is a direction parallel to the laminated plate and a cutting progress direction.

  That is, the odd-numbered sheet has a tendency to suppress vibration even if the number of blades is smaller than the even-numbered sheet. Further, according to actual experiments, although depending on the diameter and the rotational speed of the shaft body 5, It has been found that when the number of blades is a prime number such as 5, 7, 11, 13, 17, and 19, more suitable cutting can be performed.

  Based on the above knowledge, the cutting tool 100 of the present embodiment has 11 blades for cutting the glass 11 as described above.

  Therefore, according to this configuration, although the number of blades is small, the cutting performance is not inferior to that of a blade having many blades, and the number of blades is small. Therefore, it is possible to reduce the cost and labor of production.

Next, the discharge path 6 of (2) will be described.
As described above, the discharge path 6 draws the chips of the resin plate S1 cut by the second blade 42 from the side peripheral surface of the shaft body 5 and discharges the chips from the tip surface of the shaft body 5. belongs to.

This will be described more specifically.
As shown in FIG. 1, FIG. 3, FIG. It is formed from a side circumferential opening hole 62 that is formed so as to communicate with the tip opening hole 61.

The tip opening hole 61 is a bottomed hole extending from the circular opening 6a provided at the center of the tip surface of the shaft body 5 in the axial direction while slightly narrowing the inner diameter.
The side circumferential opening hole 62 has a slit shape that extends in a radial direction from a rectangular opening 6 b provided on the side circumferential surface of the shaft body 5 and communicates with the inner circumferential surface of the tip opening hole 61.

  In this embodiment, the opening 6b is provided in a portion adjacent in the circumferential direction where the second blade 42 is provided. The opening 6b only needs to extend at least over the second blade forming portion 52 in the axial direction, that is, at least over both ends of the second blade 42 in the axial direction. In this embodiment, the opening 6b further extends in the axial direction, reaches one first blade forming portion 51 in the root direction of the shaft body 5, and the other first blade forming portion 51 in the distal end direction. And the tip end surface of the shaft body 5 is also opened. The opening 6b is positioned between the adjacent first blades 41 so as not to interfere with the first blades 41.

  Further, the inner side surface 6 d on the base side of the side circumferential opening hole 62 is inclined so as to go to the tip side as it goes to the center of the shaft body 5.

  Thus, according to such a configuration, the resin chips are discharged from the front end surface of the shaft body 5 through the side circumferential opening hole 62 and the front end opening hole 61. Therefore, it is possible to prevent problems such as resin chips being wound around the second blade 42.

  In particular, in the individual embodiment, since the tip opening hole 61 is provided on the axis, the centrifugal force does not act on the chips pushed out from the side opening hole 62 to the tip opening hole 61, It is easy to fall down, and the effect that discharge is promoted can be achieved.

The present invention is not limited to the above embodiment.
For example, the number of first blades is not limited to 11 and may be an odd number of 3 or more and 19 or less. The number of the second blade is not limited to one and may be plural. However, in the case of the above-described embodiment in which the first blades are provided at both ends, it is preferable that a discharge path is formed in a portion adjacent to the circumferential direction of each second blade.

  In the case of a laminated material in which the glass plate is attached only to one side of the resin plate, or when the bottomed groove is cut without cutting even if the glass plate is attached to both sides of the resin plate May be a cutting tool in which the first blade is provided only on one side adjacent to the second blade in the axial direction. If only the glass plate is cut, the second blade is unnecessary and only the first blade is required.

  In the discharge path, the side opening hole does not have to reach the tip surface of the shaft body. Although the inner peripheral surface on the base side of the side opening hole does not necessarily have to be inclined as in the above-described embodiment, the chip dischargeability may be inferior.

  The ridge line shape of the first blade, particularly the cutting edge, is linear in the embodiment, but may be curved or may be inclined with respect to the axial direction.

The phase in the circumferential direction of the first blade may be different between one first blade row and the other first blade row.
In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Cutting tool 3 ... Shaft body 41 ... 1st blade 42 ... 2nd blade 6 ... Discharge path 6a, 6b ... Opening S1 ... Glass plate S2 ... Resin Plate S ... Laminated plate

Claims (6)

  Cutting comprising a rotating shaft body and a first blade provided on the shaft body, the first blade rotating while being pressed against an end surface of the glass plate, and cutting the glass plate A cutting tool, wherein an odd number of first blades are provided on the shaft body.   The cutting tool according to claim 1, wherein the number of the first blades is 3 or more and 19 or less.   The cutting tool according to claim 2, wherein the number of the first blades is a prime number.   A laminated plate in which a glass plate and a resin plate are overlapped is cut, and the shaft body is provided with a second blade in a region adjacent to the axial direction of the region where the first blade is provided. The cutting tool according to claim 1, 2 or 3, wherein the first blade is configured to cut a glass plate, and the second blade is configured to cut a resin plate. The shaft body is formed with a discharge path for discharging chips of the resin plate cut by the second blade,
The discharge path has one end opened at a position different from the side circumferential surface on which the second blade is provided in the circumferential direction, and the other end opened at the tip end surface of the shaft body. The cutting tool according to claim 4. In what cuts the laminated board which laminated the glass plate and the resin board,
A rotating shaft,
A first blade provided on the shaft body for cutting a glass plate from its end face;
Provided in a region adjacent to the axial direction of the region where the first blade is provided in the shaft body, the second blade for cutting the resin plate from its end surface,
The shaft body is formed with a discharge path for discharging chips of the resin plate cut by the second blade, and the discharge path is circumferential with respect to the side peripheral surface on which the second blade is provided. A cutting tool characterized in that one end thereof opens at a position that is different from each other in the axial direction, and the other end opens at the tip surface of the shaft body.