JPH0985734A - Wheel cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a scribing groove with a uniform depth and being excellent in continuity along a curve with a small radius of curvature, and cut a fragile material plate into a desired shape by tilting the rotating shaft of a wheel at a specified angle to the surface of the fragile material. SOLUTION: The rotating shaft 2 of a glass cutter wheel 1 is tilted at 10-45 deg. to the surface of a fragile material 3, and the tip of the wheel comes into contact with the surface of the fragile material into an arc form. For this reason, when the wheel 1 is advanced along a curve which is bent in the same direction as the arc, even if the radius of curvature of the curve is as small an arc as the diameter of the wheel, a favorable continuous scribing groove is formed. Therefore, the fragile material can be cut into a desired shape, e.g. a curved shape with a small radius of curvature of approx. 5mm. Also, the change of a pressure in the circumferential direction, which is applied to the blade tip, becomes gentler compared with a wheel of a smaller diameter, and the blade tip is not worn out, and the life of the wheel can be extended.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary foil type cutter for cutting a scribe groove for cutting on a brittle material plate such as glass, and more particularly to forming a scribe groove suitable for cutting a brittle material into a circular or curved shape. Regarding the foil cutter.

[0002]

2. Description of the Related Art Conventionally, in this type of glass foil cutter, as shown in FIG. 5, the tip of the glass cutter foil 7 is in contact with the surface of the brittle material 3 in a straight line in a minute section, so that the foil is strongly resistant to the brittle material. When pressed, linear concave scratches 8 having a minute length are formed on the surface of the brittle material 3 as shown in FIG. Therefore, when the foil is linearly moved in the extension direction of the concave scratch 8, the concave scratch 8 becomes a continuous straight line, and a continuous linear scribe groove is formed on the surface of the brittle material. Further, even when the foil is moved along a gentle curve, if the radius of curvature of the curve is sufficiently larger than the diameter of the foil, a scribe groove having a similar continuous curve is formed, and no particular problem occurs.

However, when the foil is moved along a curve having a radius of curvature about the same as or smaller than the diameter of the foil, the surface of the brittle material has linear small scratches in the form of a tangent line tangent to the curve. Are formed innumerably along the line, resulting in a scribed groove with a width and poor continuity,
When the glass is broken, there is a problem that breakage easily progresses from the curve and it is difficult to cut the glass into a desired curved shape.

If the diameter of the cutter foil is reduced in order to reduce the length of a minute straight line in which the tip of the foil comes into contact with the surface of the brittle material, some improvement can be expected in that the scribe groove along the curve is formed. However, in order to easily and satisfactorily break a brittle material into a curved shape, it is necessary to form deep and uniform scribed grooves. Compared with a large diameter foil, the change in stress distribution before and after the foil traveling direction is sharp and small. In the case of a wheel, when trying to form a deep scribe groove equivalent to the deep scribe groove that is possible with a large-diameter wheel, there is a problem in that the scribe groove is likely to enter intermittently and it is difficult to achieve a uniform depth.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above problems by forming a scribed groove having a uniform depth and excellent continuity along a curve having a small radius of curvature to achieve a desired scribed groove. An object is to provide a foil cutter capable of cutting a brittle material plate into a shape.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a foil cutter for forming a scribed groove on the surface of a brittle material, wherein the rotation axis of the foil is inclined by 10 to 45 degrees with respect to the surface of the brittle material. Is.

According to the present invention, since the rotating shaft of the foil is inclined by 10 to 45 degrees with respect to the brittle material surface, the tip of the foil contacts the brittle material surface in an arc shape. for that reason,
When the foil is advanced along a curved line that is curved in the same direction as the arc, even if the radius of curvature of the curve is as small as the diameter of the foil, a good quality continuous scribed groove is formed. If the inclination angle of the wheel rotation axis is less than 10 °,
It is difficult to form a good quality continuous scribed groove having a small radius of curvature.

On the other hand, when the angle exceeds 45 °, the contact area between the tip of the foil and the surface of the brittle material plate 3 is suddenly lengthened,
The force that presses the foil against the brittle material plate must also be increased in proportion to the contact area, so that the rigidity of the wheel rotating shaft and the rigidity of the foil itself must be significantly increased, which is not practical. . Radius (R) 3.0 to 50.
When forming a scribe groove having a shape of a circle having a diameter of 0 mm, 1.0 to 1 is used as a cutter wheel.
The one having a radius (r) of 0.0 mm is used, and the inclination angle of the rotation axis is arcsin (0.8r / R) to arcsin.
It is preferable to adjust to the range of (1.2r / R).

An angle θ formed by the surface of the brittle material plate and the surface of the brittle material plate on the inclined upper side of the rotary shaft (the end surface of the rotary shaft end farther from the surface of the brittle material plate) of both surfaces of the tip of the foil. ₁
The angle θ ₂ between the other surface of the cutting edge and the surface of the brittle material plate is adjusted in consideration of the tilt component due to the rotation axis of the foil. If θ ₁ and θ ₂ are made equal, the scribe groove extends perpendicularly to the surface of the brittle material plate, but if θ ₁ is made larger than θ ₂ by, for example, 10 degrees, the scribe groove becomes vertical to the outside (the inclination of the rotation axis). It extends about 5 degrees (half of the difference between θ ₁ and θ ₂ ) toward the right side, and on the contrary, if it is reduced by 10 degrees, it will increase to about 5 inside.
It grows at an angle.

When a brittle material plate is fractured along a curved scribe groove, the fracture surface (thickness direction) tends to progress inward of the scribe groove. Therefore, when it is desired to make the fracture surface as vertical as possible, It is preferable to keep θ ₁ larger than θ ₂ . Normally, θ ₁ is 10 to 35 ° and θ ₂ is 3
It is adjusted to -30 ° and θ ₁ is larger than θ ₂ by 2 ° or more.

The foil cutter of the present invention has a thickness of 0.5-5 mm.
It is suitable for cutting brittle material plates, such as thick glass plates, and in particular can be cut into curves with a radius of curvature of 5-10 mm, for example circular with a radius of 5-10 mm. 0.
To form a circular scribed groove in a brittle material plate having a small thickness of 5 to 1.5 mm, 1.0 to 2.0 mm
It is preferable to use a cutter radius with a small radius.

[0012]

1 shows a tilting rotary cutter wheel according to the present invention. FIG. 2 is an enlarged view of the tip portion thereof. The cutter wheel 1 has a diameter of 5 mm, and the rotary shaft 2 is attached to the block 11 with the rotary shaft 2 inclined at about 30 °. The tip angle of the cutter wheel 1 is 53 ° on the side where the rotary shaft 2 is lowered (from a plane perpendicular to the rotary shaft) and 103 ° on the side where the rotary shaft 2 is raised. Therefore, the blade contact angles θ ₁ = 17 ° and θ ₂ = 7 ° were measured from the surface of the glass plate. The wheel rotation shaft 2 is attached so as to be inclined at α = 30 ° with respect to the surface of the glass plate 3 having a thickness of 3 mm, which is a brittle material.

FIG. 3 is an enlarged view of a concave scratch due to the bite of the foil into the glass surface when the cutter foil 1 is pressed against the surface of the glass plate 3 with a load of 10 kg. The concave scratch 4 has a length of about 500 μm and a radius of curvature of 5 when viewed from above.
I drew an arc equivalent to mm. The value of the radius of curvature R of this circular arc (5 mm) is calculated from the inclination angle α (about 30 °) of the rotary shaft 2 and the radius r (2.5 mm) of the wheel as an approximate expression R = r / sin α.
It agrees with the value calculated in.

As shown in FIG. 4, by rotating the cutter wheel 1 in the direction of the arrow 6 along a circular curve 5 having a radius of curvature of 5 mm, the cutter foil 1 is continuously and uniformly formed along the curve 5 on the lower surface of the glass plate 3. A circular scribe groove having a depth of about 500 μm and a width of 30 μm was formed. This scribe groove is not perpendicular to the glass plate but is inclined downward from the upper surface of the glass plate by about 5 ° outside the curve 5 because the blade contact angles θ ₁ and θ ₂ measured from the glass plate surface are different. When the glass was broken along this curve 5, the fracture surface became a truncated cone shape, and the circular glass plate portion with a radius of about 5 mm could be easily pulled out downward, and the separation was easy. It was

When the values of the cutting edge contact angles θ ₁ and θ ₂ are set to be opposite to each other, the scribe groove is inclined downward from the upper surface of the glass plate by about 5 ° inside the curve 5. When the glass was broken along the curve 5, the fracture surface became a truncated cone shape, and the circular glass plate portion having a radius of about 5 mm could be easily pulled out in the upward direction. When the blade contact angles θ ₁ and θ ₂ are set to the same value, the scribe groove extends perpendicularly to the glass plate.

For comparison, in the case of the conventional cutter foil 7 shown in FIG. 5, an enlarged view of the concave scratches due to the biting of the foil when the cutter foil is pressed against the surface of the glass plate 3 is as shown in FIG. As compared with the concave scratch 4 in FIG. 3, the concave scratch 8 has a deviation of about 6 μm in the width direction. This difference in the width direction appears as a difference in the depth and width of the scribed groove along the curve 5, and a discontinuous scribed groove having a depth of 500 μm and a width of about 45 μm was formed. Then, when the glass was broken, the breaking progressed from the curve.

FIG. 7 shows an example of another curved shape. This closed curve is composed of a straight line portion 9 and a corner portion 10. The corner portion 10 has a radius of curvature of 5 mm. The same cutter foil as that used in the above example was moved along the straight line portion 9 and the corner portion 10 to form a scribe groove, and the glass plate was broken along the scribe groove.

Since the straight portion 9 is easily broken, it is not necessary to form a scribe groove as deep as the curved portion 10. Therefore, the load of the cutter wheel 1 is
0 may be set to a constant value, but at the corner portion 10, 10
It is also possible to make the scribe groove shallow by limiting the linear portion 9 to about 5 kg. Straight part 9, corner part 1
When the load is 5 kg for both 0 and 0, the length of the concave scratch 4 due to the bite into the glass in FIG. 3 is about 200 μm.
The deviation from the concave scratch 8 was suppressed to about 2 μm.

From the above, it was possible to improve the quality of the scribed groove of the corner portion 10 without deteriorating the quality of the scribed groove of the straight portion 9 and to cut the brittle material plate into a desired shape.

[0020]

According to the present invention, it is possible to form a scribe groove along a curve having a radius of curvature equal to or smaller than the wheel diameter, which is particularly effective in forming a circular scribe groove. Further, since the wheel diameter can be increased, continuous scribed grooves having a uniform depth can be formed.

Therefore, the brittle material plate can be cut into a desired shape, for example, a curved shape having a small radius of curvature of about 5 mm. Since the change in the pressure applied to the cutting edge in the circumferential direction is gentler than that of the small-diameter foil, the cutting edge can be extended and the life of the foil can be extended without causing any pain. Furthermore, since the rotation speed of the foil is lower than that of the small-diameter foil, the wheel center shaft is also less likely to wear.

[Brief description of drawings]

FIG. 1 is a sectional view showing a glass cutter wheel according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of the tip of the glass cutter foil shown in FIG.

FIG. 3 is a perspective view showing concave scratches formed on the surface of a brittle material due to the glass cutter foil of the present invention.

FIG. 4 is a perspective view showing a relationship between a glass cutter wheel and a curved scribe groove according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a conventional glass cutter wheel.

FIG. 6 is a perspective view showing concave scratches formed on the surface of a brittle material by a conventional glass cutter foil.

FIG. 7 is a perspective view showing a closed curve shape in which straight and curved scribe grooves are formed by the glass cutter wheel according to the embodiment of the present invention.

[Explanation of symbols] 1 glass cutter wheel 2 rotating shaft 3 brittle material (glass plate) 4, 8 concave scratch 5 curve 6 traveling direction 7 conventional glass cutter wheel 9 large curve or straight line 10 small curve radius 11 Holder of glass cutter foil

Claims (3)

[Claims] 1. A foil cutter having a scribed groove formed on the surface of a brittle material plate, wherein the rotation axis of the foil is inclined by 10 to 45 degrees with respect to the surface of the brittle material plate. 2. The scribed groove has a radius (R) of 3.0 to
The foil has a circumference of a circle having a diameter of 50.0 mm, the foil has a radius (r) of 1.0 to 10.0 mm, and the inclination angle of the rotating shaft is arcsin (0.8r / R). )
The foil cutter according to claim 1, wherein the foil cutter is ~ arcsin (1.2r / R). 3. The angle between the cutting edge surface on the inclined upper hand side of the rotating shaft and the brittle material plate surface on both sides of the tip cutting edge of the foil is θ ₁ , and the other surface of the cutting edge and the brittle material plate surface are If the angle formed is θ ₂ , θ ₁ is 10 to 35 °, and θ _{2 is}
Is 3 to 30 °, and theta ₁ is at least 2 than theta ₂
The foil cutter according to claim 1, which is large.