KR100790554B1 - Polishing Wheel for grinding of sheet glass edge and its manufacturing method - Google Patents

Abstract

The present invention provides a thin glass chamfering polishing wheel for polishing the edge of thin glass while rotating at high speed, wherein the abrasive layer is generally ring-shaped to polish the edge while rotating in contact with the edge of the thin glass; And a bushing fixed to an inner diameter surface of the abrasive layer and having a shaft hole at a center thereof so as to be axially fixed to a rotating shaft, and a protrusion formed integrally with the abrasive layer so as to be firmly coupled to the abrasive layer. It is characterized in that it comprises a to improve the edge strength and edge roughness of the machining surface, can reduce the rotation runout, high balance, light weight, greatly improve the precision of machining, and reduce the failure rate In addition, it is easy to attach and detach from the equipment, and can increase the price competitiveness by increasing the inner diameter of the bushing even without using a separate adapter, it has the effect of reducing the replacement time of the grinding wheel.

Description

Polishing Wheel for grinding of sheet glass edge and its manufacturing method

1 is a perspective view showing a thin glass chamfering polishing wheel according to an embodiment of the present invention.

2 is a partial side cross-sectional view of FIG. 1.

3 is a state diagram used in FIG.

4 is a plan view illustrating an example of the bushing of FIG. 1.

5 is a plan view illustrating another example of the bushing of FIG. 1.

6 is a block diagram showing a method of manufacturing a thin glass chamfering polishing wheel according to an embodiment of the present invention.

(Description of Major Symbols in the Drawing)

1: laminated glass 2: recessed groove

3: cutting surface 10: abrasive grain layer

20: bushing 20a: shaft ball

21: groove portion 30: projection portion

31: horizontal portion 32: flange portion

33: gap

The present invention relates to a thin glass chamfering polishing wheel and a manufacturing method thereof, and more particularly, to a thin glass chamfering polishing wheel for polishing the rim surface of the thin glass while rotating at a high speed fixed to the rotating shaft and a method for manufacturing the same. .

In general, next-generation flat panel display products, which replace existing CRT monitors such as liquid crystal displays (PDP) and plasma display panels (PDPs), are widely used in various fields such as computers, monitors, and TVs.

The glass used to manufacture flat panel displays such as LCDs and PDPs is generally thin glass of several millimeters in thickness, and its flatness is very important to realize accurate display functions, and also prevents cracking of edges. In order to improve the uniformity of processing, the edge strength and surface roughness are very important.

The conventional thin glass chamfering wheel for processing such an edge surface was largely comprised of an abrasive grain layer and a bushing so that the edge surface of thin glass may be polished while rotating at high speed.

Here, the abrasive layer is to polish the rim surface while rotating in contact with the edge surface of the thin glass, the bushing is fixed to the inner diameter surface of the abrasive layer, it is connected to the rotation axis of the motor.

In particular, such an abrasive layer is made by simply mixing abrasives such as stone powder and fillers such as urethane, and as the size of the LCD glass substrate is increased, it is difficult to satisfy the quality of the edge surface.

That is, when the conventional thin glass chamfering wheel is used, the edge strength of the thin glass is 100 to 110 Mpa, and there is a problem that it is easily broken when a pressure is applied to the center of the glass. Cut the glass substrate to a certain size (e.g. 150mm × 20mm), fix it to the ground, and slowly apply pressure to the center of the glass to measure the pressure when it breaks.

In addition, when the conventional thin glass grinding wheel for chamfering is used, the edge roughness (surface roughness) of the thin glass is also 0.12 to 0.15 μm, and the surface is rough so that the edge strength can be weakened, and the physical properties can be adversely affected. (Edge roughness is a measure of the surface roughness of scanning a face with a probe or imaging a reflected light using a light source).

Meanwhile, a bushing of a conventional thin glass chamfering wheel is made of aluminum and is fixed to the abrasive layer by an interference fit method, and a rotation run out (number of vibrations during rotation) is 0.1 to 0.25. mm, the balance is very low, the weight is very high, the precision is greatly reduced, the failure rate is high, and this aluminum bushing is easily peeled off from the abrasive layer, or when it is mounted on the equipment, the deformation of the product In addition to causing non-uniformity, there are many problems, such as binding to the rotating shaft of the motor, making it difficult to remove or damage the product and equipment.

In addition, in order to improve the price competitiveness of conventional thin glass chamfering polishing wheels, the inner diameter of the bushing is increased and a separate adapter may be used. However, in this case, the time required for mounting a separate adapter and the production cost of the adapter are increased. There was an issue added.

In particular, in recent years, the thickness of thin glass chamfering polishing wheels has been increased to reduce the replacement time of the thin glass chamfering polishing wheels and to secure more polishing areas. There was a problem that the balance could hardly be satisfied with conventional thin glass chamfering wheels.

It is an object of the present invention to solve the above problems, to provide a thin glass chamfering polishing wheel and a method of manufacturing the same that can satisfy the quality of the edge surface, that is, sufficient edge strength and edge roughness even in large sheet glass processing. have.

In addition, another object of the present invention, it is possible to reduce the rotation runout, the balance is very high, the weight can be reduced to greatly improve the precision of processing, lower the failure rate, and facilitate the removal of the equipment To provide a thin glass chamfering polishing wheel and a method of manufacturing the same.

In addition, another object of the present invention is to increase the internal diameter of the bushing even without using a separate adapter to increase the price competitiveness, and to reduce the replacement time of the polishing wheel thin glass chamfering polishing wheel and its production In providing a method.

The thin glass chamfering polishing wheel of the present invention for achieving the above object, in the construction of a thin glass chamfering polishing wheel for polishing the rim surface of the thin glass while rotating at high speed, while contacting and rotating the rim surface of the thin glass An abrasive grain layer that is generally ring-shaped to polish the edges; And a bushing fixed to an inner diameter surface of the abrasive layer and having a shaft hole at a center thereof so as to be axially fixed to a rotating shaft, and a protrusion formed integrally with the abrasive layer so as to be firmly coupled to the abrasive layer. Characterized in that comprises a.

In addition, according to the present invention, the projection portion, the horizontal portion whose cross-sectional shape protrudes horizontally from the outer diameter surface of the bushing so as to bury a predetermined distance in the abrasive layer; And a flange portion whose cross-sectional shape protrudes vertically vertically from the horizontal protrusion portion.

In addition, according to the present invention, a plurality of the projections are radially installed on the circumferential surface of the bushing so that a gap may be formed therebetween.

On the other hand, the thin glass chamfering polishing wheel of the present invention for achieving the above object is in contact with the rim surface of the thin glass in constituting the thin glass chamfering polishing wheel for polishing the edge of the thin glass while rotating at high speed An abrasive grain layer having an overall ring shape for polishing the edge surface while rotating; And a bushing fixed to the inner diameter surface of the abrasive layer, wherein the abrasive layer comprises 55 to 70 wt% of an abrasive having a main component of silicon carbide (SiC) and 18 to 28 wt% of a filler having a main component of urethane. , The main components of chromium oxide (CrO), cerium oxide (Ce ₂ O), resin powder (Resin Powder), calcium carbonate (CaO ₃ ), calcium oxide (CaO), iron oxide (Fe ₂ O ₃ ) and combinations thereof It is characterized in that the glossy material formed by selecting any one is made of 3 to 25% by weight.

On the other hand, the manufacturing method of the thin glass chamfering polishing wheel of the present invention for achieving the above object, as a whole to polish the rim surface while rotating in contact with the rim surface of the thin glass to polish the rim surface of the thin glass while rotating at high speed A ring-shaped abrasive layer is fixed to the inner diameter surface of the abrasive layer, the shaft hole is formed in the center to be fixed to the axis of rotation, and the protrusions embedded in the abrasive layer to be solidly bound with the abrasive layer is integrally A method of manufacturing a thin glass chamfering wheel comprising a bushing formed, the method comprising: injection molding the bushing by inserting a bushing raw material into a bushing mold; Mixing the abrasives, fillers, and polishes, which are the abrasive layer raw materials, with each other to form an abrasive grain dough; Aligning the bushing on the lower plate of the entire mold, closely attaching the abrasive layer dough around the bushing, and covering the upper plate of the entire mold to mount the bushing and the abrasive layer in the entire mold; Pressing and thermoforming by heating and pressurizing the filler to foam, firing, drying and aging for a predetermined time; And cutting the outer surface of the abrasive grains drawn out from the entire mold with a cutter: and removing foreign substances from the abrasive grain cutting surface.

Hereinafter, a thin glass chamfering wheel for thin glass according to various embodiments of the present invention and a manufacturing method thereof will be described in detail with reference to the accompanying drawings.

First, as shown in FIGS. 1 and 2, the thin glass chamfering polishing wheel according to the preferred embodiment of the present invention is to polish the edge (edge) of the thin glass 1 while rotating at high speed. , The abrasive grain layer 10 and the bushing 20 are largely comprised.

That is, the abrasive grain layer 10 is in contact with the edge surface of the thin glass 1 to rotate the edge surface while rotating, and is formed in a ring shape as a whole, and the material includes an abrasive, a filler, and a polish.

In addition, the bushing 20, which is fixed to the inner diameter surface of the abrasive grain layer 10, is formed with a shaft hole (20a) in the center to be fixed to the axis of rotation (not shown) of the motor.

In addition, the bushing 20 is formed of an integrally formed protrusion 30 embedded in the abrasive layer 10 so that the bushing 20 can be firmly bound to the abrasive layer 10. The material of the bushing 20 can be injection molded. It is a synthetic resin.

In particular, as shown in FIG. 2, the protrusion part 30 of the bushing 20 is embedded in the abrasive layer 10 so that the horizontal part 31 can be firmly attached to the abrasive layer 10. And the flange portion 32.

That is, the cross-sectional shape of the horizontal portion 31 protrudes horizontally from the outer diameter surface of the bushing 20 by a predetermined distance, and the flange portion 32 has a cross-sectional shape of the horizontal protrusion 30. It will protrude vertically up and down.

Therefore, the abrasive layer 10 and the bushing 20 can be firmly bound by the horizontal portion 31 from the up and down impact, and the abrasive layer 10 and the bushing (by the flange portion 32). 20) can be firmly bound from the left and right shocks.

Here, the protrusion 30 may be formed in a disc shape along the outer circumferential surface of the bushing 20, as shown in FIG. 4, but preferably, as shown in FIG. 5. It is preferable that a plurality of radially conformal portions are provided on the circumferential surface of 20 so that a gap 33 is formed therebetween.

Accordingly, in the process of attaching the abrasive layer 10 to the bushing 20, raw material of the abrasive layer 10 flows between the gaps 33 of the bushing 20 to prevent delamination, thereby enabling more firm fixing. At the same time, it is filled between the gaps 33, thereby suppressing the formation of internal voids, thereby suppressing runout of the product and improving the balance.

On the other hand, as shown in Figures 1 and 2, it is also possible to form a weight reducing groove portion 21 on the upper and lower surfaces of the bushing 20, respectively, and the free forming of the projection portion 30 and the groove portion 21 In order to achieve this, the bushing 20 may be formed by selecting any one of ABS resin, PP, PE, MC Nylon, and a combination thereof.

Therefore, by using the thin glass chamfering polishing wheel of the present invention, the value of the rotational runout can be significantly lowered from 0.02 to 0.14 mm, and the balance is uniform and at the same time light weight and high precision are achieved, resulting in the failure rate. Lowering the product and preventing damage to the product and equipment.

The thin glass chamfering abrasive wheel of the present invention is composed of an abrasive grain, a filler and a polished material to form an abrasive grain layer. The abrasive grain layer 10 is composed of 55 to 55 abrasive grains whose main component is silicon carbide (SiC). 70% by weight, 18-28% by weight of fillers containing urethane as main ingredient, chromium oxide (CrO), cerium oxide (Ce ₂ O), resin powder, calcium carbonate (CaO ₃ ), calcium oxide (CaO) ), Iron oxide (Fe ₂ O ₃ ) and a glossy material formed by selecting any one of them is composed of 3 to 25% by weight.

Therefore, the edge strength of the thin glass 1 processed using the thin glass chamfering polishing wheel of the present invention including such a gloss material is 110 to 120 Mpa, and of course, the strength is remarkably increased as compared with the prior art. The edge roughness (surface roughness) of the thin glass 1 is also 0.10 to 0.14 µm, and the surface is denser than before, so that the edge strength is stronger and physical properties are improved.

Accordingly, as shown in FIG. 3, when the edge surface of the thin glass 1 is rubbed with the outer circumferential surface of the abrasive layer while rotating the thin glass chamfering polishing wheel of the present invention at high speed, the abrasive layer 10 is worn and concave. While the groove 2 is formed, the edge surface of the thin glass 1 may be processed, and a plurality of thin glass may be formed while forming other concave grooves 2 adjacent to each other at a predetermined distance from the concave groove 2. The edge surface of 1) can be processed continuously one after the other.

When the concave grooves 2 are formed on the entire outer circumferential surface of the abrasive layer 10, the outer circumferential surface of the abrasive layer 10 may be cut to form a new cutting surface 3, and then used again.

Meanwhile, in the method of manufacturing the thin glass chamfering wheel for thin glass of the present invention, as shown in FIG. 6, first, a bushing raw material is prepared (S1), and the bushing is injected into the bushing mold to injection-molize the bushing ( S2).

In addition, the abrasive, the filler and the polishing material as the abrasive grain raw materials are separately prepared (S3), and mixed with each other to form an abrasive grain dough (S4). At this time, the abrasive layer raw material is stirred by a ball mill operation (mixing using a plurality of balls).

Subsequently, the bushing is aligned with the lower plate of the entire mold, and the abrasive grain dough is closely adhered to the circumference of the bushing, and then the bushing and the abrasive grain layer are mounted in the entire mold by covering the upper plate of the entire mold (S5). At this time, the abrasive grain dough is formed in a long rice cake shape so as to easily adhere to the circumference of the bushing.

Subsequently, the filling material of the abrasive layer is heated and pressurized so as to foam, followed by compression thermoforming, firing, drying, and aging for a predetermined time (S6). At this time, the thermoforming temperature is approximately 60 to 100 degrees, and the firing, drying, and ripening time is about 10 hours or more.

Next, the external appearance of the abrasive grain layer drawn out from the entire mold is cut with a cutter (S7). In this case, the cutter is a diamond wheel.

Subsequently, foreign matter on the abrasive grain cutting surface is removed with a brush (S8), and the finished product is inspected and shipped (S9).

Therefore, the thin glass chamfering polishing wheel produced by such a process is not only firmly attached to the abrasive layer and the bushing, but also can be manufactured in a very light weight even at a wide thickness, and can greatly improve various performances.

The present invention is not limited to the above-described embodiments, and of course, modifications may be made by those skilled in the art without departing from the spirit of the present invention.

For example, in the embodiment of the present invention, the protrusion is composed of a horizontal portion and a flange portion, the thickness and size of the abrasive layer and the bushing, etc., as shown in the drawings, but in addition to the range of each component within the scope of the present invention. Forms, types, designs, etc. can be modified and changed in various ways.

Therefore, the scope of the claims in the present invention will not be defined within the scope of the detailed description, but will be defined by the following claims and the technical spirit thereof.

As described above, according to the thin glass chamfering abrasive wheel of the present invention and a manufacturing method thereof, it is possible to improve the edge strength and edge roughness of the processing surface, reduce the rotational runout, high balance, light weight, It can greatly improve the precision, reduce the rate of defects, facilitate the attachment and detachment of the equipment, and increase the price competitiveness by increasing the inner diameter of the bushing without using an adapter, and improve the replacement time of the grinding wheel. It will have a reducing effect.

Claims (8)

delete delete delete delete delete In constructing a thin glass chamfering wheel for polishing the edge of thin glass while rotating at high speed, An abrasive grain layer having an overall ring shape in contact with the edge of the thin glass and rotating while polishing the edge; And Bushing is fixed to the inner surface of the abrasive layer: The abrasive layer is 55 to 70% by weight of the abrasive, the main component of silicon carbide (SiC), 18 to 28% by weight of the filler material of the urethane as the main component, chromium oxide (CrO), cerium oxide (Ce ₂ O), resin Resin powder, calcium carbonate (CaO ₃ ), calcium oxide (CaO), iron oxide (Fe ₂ O ₃ ) and the polishing material formed by selecting any one of them, characterized in that consisting of 3 to 25% by weight Polishing wheel for thin glass chamfering. It is fixed to the ring-shaped abrasive grain layer and the inner diameter surface of the abrasive grain layer, which are in contact with the edge surface of the laminated glass while rotating at high speed to polish the edge surface of the laminated glass, and to be fixed to the rotation axis. In the manufacturing method of the thin glass chamfering grinding wheel comprising a bushing is formed in the center, the bushing is formed integrally with the projection embedded in the abrasive layer so as to be firmly bound to the abrasive layer, Injection molding the bushing by inserting a bushing raw material into a bushing mold; Mixing the abrasives, fillers, and polishes, which are the abrasive layer raw materials, with each other to form an abrasive grain dough; Aligning the bushing on the lower plate of the entire mold, closely attaching the abrasive layer dough around the bushing, and covering the upper plate of the entire mold to mount the bushing and the abrasive layer in the entire mold; Pressing and thermoforming by heating and pressurizing the filler to foam, firing, drying and aging for a predetermined time; Cutting the appearance of the abrasive grains extracted from the entire mold with a cutter; and Removing foreign matter from the abrasive grain cutting surface; Method for producing a thin glass chamfering polishing wheel comprising a. The method of claim 7, wherein The abrasive layer raw material is stirred by a ball mill operation (mixing using a plurality of balls), The abrasive grain dough is formed in the shape of a long rice cake, The thermoforming temperature is approximately 60 to 100 degrees, The firing, drying and ripening time is about 10 hours or more, When cutting the external appearance of the abrasive layer, the cutter is a diamond wheel, Removing the foreign material of the cutting surface is a manufacturing method of the thin glass chamfering polishing wheel, characterized in that made of a brush.

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