KR20160076170A - Scribing Wheel - Google Patents

Abstract

SUMMARY OF THE INVENTION The present invention provides a scribing wheel that reduces the rate of failure of flat glass products and extends the life of the scribing wheel. A scribing wheel according to the present invention comprises: a rotating shaft hole formed through a rotating shaft line; An opposing edge inclined surface forming a circumferential cutting edge; And a pair of mutually parallel side surfaces disposed between the edge inclined surface and the rotating shaft hole. The side surfaces have inner and outer ribs concentric with each other with a ring-shaped depression interposed therebetween.

Description

Scribing Wheel {Scribing Wheel}

The present invention relates to a scribing wheel for cutting a plate glass for an LCD (Liquid Crystal Display) display.

The plate glass material for LCD display is cut according to the size of the desired product. Scraping wheels are mainly used for cutting the plate glass. The scribing wheel is rotatably supported by the holder through the rotating pin.

As the scribing wheel rotates, the surface of the plate glass is scribed to produce fine glass particles, which can penetrate between the scribing wheel and the holder. The infiltrated glass particles interfere with smooth rotation of the scraping wheel and can make the scraping wheel be inclined with respect to the surface of the plate glass. Whereby the life of the scraping wheel can be reduced and the defect rate can be increased.

Accordingly, it is an object of the present invention to provide a scribing wheel which improves the defect rate due to glass particles and the life of the scribing wheel.

The above object can be accomplished by providing a spinning machine, comprising: a rotating shaft hole formed through a rotating shaft; An opposing edge inclined surface forming a circumferential cutting edge; Wherein each of the side surfaces has an inner diameter rib and an outer diameter rib which are formed concentrically with each other with a depressed portion in the form of a ring therebetween, and a pair of side surfaces arranged between the edge inclined surface and the rotating shaft hole, It is achieved by the ice wheel.

Here, the depth of the depressed portion is made to become lower toward the outer diameter rib at least in a part of the radial section, so that the minute glass particles are removed to the outside by the centrifugal force of the scribing wheel without penetrating between the holder and the scribing wheel .

Since the sidewall of the outer diameter rib adjacent to the depression has an outward inclination angle, the glass particles are removed to the outside by the centrifugal force of the scribing wheel.

Here, the height of the outer diameter rib in the axial direction may be higher than the height of the inner diameter rib. The outer diameter rib can be brought into close contact with the holder so that the scribing wheel does not tilt with respect to the plate surface of the plate glass, and the inner diameter rib can be prevented from being in close contact with the holder, thereby reducing frictional resistance due to fine glass particles penetrating between the holder and the inner diameter rib.

According to the present invention, by reducing the frictional resistance caused by penetration of fine glass particles between the scribing wheel and the holder, it is possible to improve the defective rate of the glass product by the glass particles and the lifetime of the scribing wheel.

1 and 2 are a perspective view and a cross-sectional view showing a scribing wheel according to a first embodiment of the present invention,
Figures 3 (a), (b), and (c) are cross-sectional views of a scribing wheel according to other embodiments of the present invention.

Hereinafter, a scribing wheel 1 according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in the perspective view of Fig. 1 and the sectional view of Fig. 2, the scribing wheel 1 according to the first embodiment of the present invention is a scribing wheel having a substantially disc shape, A hole 10 is formed. The outer cutting edge 200 is formed of an edge inclined surface 20 which faces mutually along the circumferential direction. There is a pair of side portions 30 parallel to each other between the edge inclined surface 20 and the rotating shaft hole 10. A rotary pin (not shown) for rotating the scribing wheel 1 is received in the rotary shaft hole 10. In order to facilitate insertion of the rotary pin, a rotating shaft public eye inner surface 100 is formed in the axial end portions of the rotary shaft hole 1 in the form of a funnel. Each of the side portions 30 is formed with a depressed portion 40 recessed inward in the axial direction. The depressed portion 40 has a circular ring-shaped groove shape with respect to the axis of rotation. An inner diameter rib 300 and an outer diameter rib 310 are formed on the inner and outer diameters side of the depression 40 so as to protrude stepwise in the axial direction of the bottom of the depression 40. The bottom surfaces of the depressed portions 40 of both side portions 30 are formed parallel to each other. The bottom surface of the depressed portion 40 may be formed in an arc shape or a wave-like cross-sectional shape instead of a flat surface, or an inclined surface having an inclination angle of a predetermined angle along the radial direction. The inner diameter ribs 300 and the outer diameter ribs 310 located radially inward and outward of the depressions 40 are formed to have the same height in the axial direction. When the scribing wheel 1 is mounted on a holder (not shown), the inner diameter rib 300 and the outer diameter rib 310 come into contact with the surface of the holder. The inner diameter ribs 300 and the outer diameter ribs 310 may have heights in different axial directions as required.

The cutting edge 200 is generally formed along a circular line. The cutting edge 200 may have various profiles such as a square waveform, a triangle waveform, a sine wave, and a sawtooth shape depending on the increase in scribing efficiency or the type and application of the material.

When the cutting edge 200 contacts the plate glass to form a crack, various sizes of glass particles are generated. Some of the generated glass particles flow into the side surface 30 of the scribing wheel 1, that is, between the surface of the holder and the depression 40. As a result, the glass particles do not increase frictional resistance between the holder and the side surface portion 30, or cause damage or the like of the contact surface. The depth and width of the depressed portion 40 are appropriately selected in consideration of the size and amount of generated glass particles.

3 (a), 3 (b) and 3 (c) are cross-sectional views showing preferred variants of the depression 40 and the ribs 300, 310. 3 (a), the depth of the depressed portion 40 of the scribing wheel 1 is progressively lowered toward the outer side in the radial direction, thereby forming an outwardly inclined surface as a whole. As a result, the glass particles flowing into the depression 40 can easily escape to the outside due to the influence of the centrifugal force and the self weight when the scribing wheel 1 rotates. The inclined surface of the depression 40 may be formed only in a part of the radial section.

The outer diameter rib 310 of the scribing wheel 1 according to the embodiment of FIG. 3 (b) is formed such that the outer diameter rib side wall 312 toward the depressed portion 40 is inclined outward. By the outward tilting of the outer diameter rib side wall 312, the glass particles can be easily separated from the outside without being accumulated by the side wall 312 when the scraping wheel 1 rotates.

The scribing wheel 1 according to the embodiment of FIG. 3 (c) has a height in the axial direction of the outer diameter rib 310 higher than an axial height of the inner diameter rib 300. Accordingly, since only the outer diameter rib 310 contacts the holder, the uprightness of the wheel 1 is maintained and the contact area is minimized, thereby further reducing the adverse effect of the glass particles.

Due to the above-described scribing wheel 1, the glass particles penetrating between the surface of the holder and the scribing wheel 1 are reduced, and most of the glass particles are released outwardly through the depressions 40. [ As a result, the scribing wheel 1 smoothly rotates and the inclination to the plate surface of the plate glass is reduced, so that the defect rate of the plate glass product can be reduced and the life of the scraping wheel 1 can be prolonged.

1: scribing wheel 10: rotating shaft
20: edge inclined surface 30:
40: depression 100: inner surface of the rotary shaft
200: cutting edge 300: inner diameter rib
302: inner diameter rib side wall 310: outer diameter rib
312: outer diameter rib side wall

Claims (4)

In the scribing wheel,
A rotary shaft hole formed through the rotary shaft;
An opposing edge inclined surface forming a circumferential cutting edge;
And a pair of parallel side surfaces disposed between the edge inclined surface and the rotating shaft hole,
Wherein each of the side portions has an inner diameter rib and an outer diameter rib formed concentrically with each other with a depressed portion in the ring therebetween. The method according to claim 1,
Wherein the depth of the depression is lowered toward the outer diameter rib at least in a part of the radial section. The method according to claim 1,
And the sidewall of the outer diameter rib adjacent to the depression has an outwardly inclined angle. The method according to claim 1,
And the height of the outer diameter rib in the axial direction is higher than the height of the inner diameter rib.

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