KR20080100556A

KR20080100556A - Grinding method of small sheet glass

Info

Publication number: KR20080100556A
Application number: KR1020070046389A
Authority: KR
Inventors: 김낙현
Original assignee: (주)성현 테크놀로지
Priority date: 2007-05-14
Filing date: 2007-05-14
Publication date: 2008-11-19

Abstract

A small sheet glass grinding method is provided to process the small thin glass to the excellent quality, the suitable small sheet glass grinding method is provided too. A small sheet glass grinding method comprises a step for fixing with vacuum-absorbing a new glass objects of the thickness less than 1mm cut down on the specified type and fixed on the specification position; and a straightline portion polishing step which polishes the side of the new glass objects while moving to the feeding speed less than 2,000mm/min over 500mm/min while rotating tool less than 30mm over the diameter 25mm over 8,000rpm less than 20,000rpm.

Description

Grinding Method of Small Sheet glass

1-a flowchart showing a first embodiment of a method for grinding small thin glass according to the present invention

2-a flow chart showing a second embodiment of the method for grinding small thin glass according to the present invention

3-a flowchart showing a third embodiment of the method for grinding small thin glass according to the present invention

Figure 4-Flow chart showing the fourth embodiment of the method for grinding small thin glass according to the present invention

Figure 5-Top view of the auxiliary tank

6-5 is a cross-sectional side view

10: case of auxiliary tank 20: inlet

30: air outlet 40: level sensor

50: discharge valve 60: obstruction partition

The present invention relates to a method for grinding small thin glass, and more particularly, to a small thin glass grinding method of grinding a side portion corresponding to the outer and inner diameters of a thin glass to be processed into a small precise shape using friction with a rotating tool. It is about.

In general, the process of cutting thin glass into a small designated shape can realize a certain quality irrespective of the cutting shape by a method such as pressurizing with a constant frequency on the upper side of the glass plate and moving it along the cutting line. In polishing the thin side surface of the glass material, the contact area between the polishing tool and the glass plate varies according to the shape of the glass plate to be processed, so that it is difficult to expect a certain quality.

Abrasive machining refers to a process in which a grinding tool that is rotated at a high speed is in contact with the side of the workpiece and smoothly cuts a rough surface. It is inevitable to generate a vibration by the rotation, due to the nature of the glass material is not easily solved the problem that cracks are easily generated and broken by the vibration, such that the polishing surface is splashed.

Such small thin glass can be polished by laser processing, but it must be equipped with expensive production equipment, and its productivity is also low, making it unsuitable for mass production, and in processing into a shape having an inner diameter or depression, As the contact area with the material becomes wider and more interference, the method of rotating the wheel tool and contacting the glass plate material is applied, so that the outer surface of the glass plate material for windows and doors having a simple rectangular shape having a thickness of 5 mm or more is chamfered or chamfered. Only processing to make is done.

As such, it is difficult to apply precision processing in polishing small thin glass, and especially in the case of complicated shape thin glass having depressions or inner diameters, it is difficult to apply polishing processing more precisely, such as the screen display of a mobile phone or the lens viewing window of a mobile phone camera. Transparent parts that require processing are made of plastic such as acrylic, which is not easily broken and easy to process.

However, these acrylic materials are easily scratched by small impacts or frictions, which not only impairs aesthetics but also functionalities, which inconveniences the user and shortens the service life of the entire device. As it is possible to improve the aesthetics, display performance and camera performance by simply replacing the glass material with the glass material, it is necessary to polish the small sheet glass that is practically suitable for mass production.

The present invention devised to solve the problems as described above, an object of the present invention is to provide a small thin glass grinding method suitable for polishing a small thin glass with excellent quality.

The present invention for achieving the object as described above, the adsorption fixing step of fixing the glass material object of 1mm or less thickness cut to a specified shape by vacuum adsorption; A straight part polishing step for polishing the side of the glass material object while moving at a feed speed of 500mm / min or more and 2,000mm / min or less while rotating a tool having a diameter of 25mm or more and 30mm or less to 8,000rpm or more and 20,000rpm or less. The method of grinding small thin glass which is made into a technical gist.

Here, it is preferable that the side surface of the glass material object has a straight or gentle curved shape, or has a shape projecting from a straight or gentle curved surface.

In addition, the present invention comprises a suction fixing step for fixing the glass material object of 1mm or less thickness cut to a specified shape by vacuum suction to a fixed position; A curved part polishing step for polishing the side of the glass material object while moving at a feed rate of 30 mm / min or more and 800 mm / min or less while rotating a tool having a diameter of 0.7 mm or more and 2 mm or less to 30,000 rpm or more and 50,000 rpm or less; The method of grinding small thin glass is another technical point.

Here, it is preferable that the side surface of the glass material object has an inner diameter of 2.5 mm or less in curvature radius, or has a shape recessed to a curvature radius of 2.5 mm or less from a straight or smooth curved surface.

In addition, the present invention comprises a suction fixing step of fixing the glass material object of 1mm or less thickness cut into a designated shape by vacuum suction to a designated position; A straight line for grinding a straight or lateral surface of the glass material object while moving a tool with a diameter of 25 mm or more and 30 mm or less at a feed rate of 500 mm / min or more and 2,000 mm / min or less while rotating a tool of 8,000 rpm or more and 20,000 rpm or less. Sub-polishing step; A curve that polishes the side surface having a radius of curvature of 2.5mm or less of the glass material object while moving a tool of 0.7mm or more and 2mm or less at a speed of 30mm / min and 800mm / min while rotating a tool of 3mm or more and 50,000mm or less. Sub-polishing step; the compact thin glass grinding method comprising a to another technical gist.

And, in the configuration of the present invention as described above, the cutting oil removal step of removing the cutting oil adhered to the glass material object by injecting high-pressure air; A cutting oil transfer step of moving the cutting oil separated from the glass material object to a designated path using a vacuum pump; A cutting oil collecting step of accumulating and collecting the cutting oil being transferred in an auxiliary tank installed on a cutting oil feeding path; It is also preferred to include an embodiment configured to further include; cutting oil discharge step of discharging the cutting oil accumulated in the auxiliary tank more than a predetermined capacity.

The auxiliary tank may further include: a case having an inner space portion extending and configured to reduce and cancel kinetic energy of the cutting oil being transferred and to be stagnant; An introduction port provided at one end of the case such that the cutting oil and air being transferred to the vacuum pump are introduced into the case; An air outlet provided at the other end of the case so that air introduced into the case can be discharged upwardly; A level sensor configured to generate a signal by detecting cutting oil accumulated above a predetermined capacity in the case; A discharge valve installed at the bottom of the case to discharge discharge the accumulated cutting oil in the case; It is preferably configured to include; a barrier rib which is installed across the straight extension path from the inlet to the air outlet so as to prevent the movement of the cutting oil to the air outlet side in the case.

Therefore, in polishing the side of the small thin glass having a thickness of less than 1mm, according to the side portion and the shape of the small thin glass, by adjusting the rotation speed, the feed rate of the tool and the tool appropriately, a variety of precision processing is required There is an advantage that the compact thin glass material of the shape can be polished with excellent quality.

In addition, when applied to a tool and an equipment that can automatically change and adjust the rotation speed of the tool, it is possible to stably and continuously mass produce small thin glass parts, thereby contributing to the enhancement of small electronic devices at a low cost. There is an advantage.

In addition, there is another advantage that it is possible to prevent the damage to the motor and cylinder of the vacuum pump due to the cutting oil flow by having a secondary tank for stagnating and accumulating the cutting oil conveyed to the vacuum pump side to block the flow of cutting oil into the vacuum pump.

The present invention having the configuration as described above will be described in detail with reference to the following drawings. 1, 2, 3, and 4 are flow charts showing the first, second and third embodiments of the method for grinding small thin glass according to the present invention, FIG. 5 is a plan view of an auxiliary tank, and FIG. 6 is a side cross-sectional view of FIG. to be.

Small thin glass grinding method according to the present invention is a glass plate material of less than 1mm thickness as the target object, while stably fixing the glass material object through the adsorption fixing step, the straight part polishing step 25mm or more 30mm in diameter Rotate the tools below 8,000rpm or more and 20,000rpm or less and move them at a feed speed of 500mm / min or more and 2,000mm / min, or through the curved part polishing step, the tools of 0.7mm or more and 2mm or less and 30,000rpm or more 50,000 While rotating at a rpm or less, the glass material is polished to move at a feed rate of 30 mm / min or more and 800 mm / min or less.

The first embodiment of the present invention shown in Figure 1 is made of the adsorption fixing step and the linear sub-polishing step, the second embodiment of the present invention shown in Figure 2 consists of the adsorption fixing step and the curved part polishing step The third embodiment of the present invention shown in FIG. 3 has a configuration consisting of an adsorption fixing step, a straight part polishing step, and a curved part polishing step.

The adsorption fixing step is a step of stably fixing the glass material object at a predetermined position so that the tool contacts and rubs on each side of the small thin glass that has already been cut into a designated shape, and thus, the entire small glass material. The bottom surface of the glass material is fixed to the processing table by the air pressure difference generated by using the vacuum pump so that the adhesive force can be evenly adhered without damage such as scratches.

The straight part polishing step and the curved part polishing step are steps of polishing the side by moving at a predetermined speed along the outer or inner angle of the glass material object fixed at a predetermined position while rotating the tool at a predetermined rotational speed. Step and curved part polishing step are to be distinguished from each other because the straight part polishing step and the curved part polishing step are more suitable for grinding of the straight part and the curved part, respectively, in which the tool diameter, rotation speed, and feed rate are in a specific range. It is a name and does not mean that each applies to the grinding | polishing of a straight part and a curved part limitedly.

The grinding step is to grind the glass material object while rotating at a feed rate of 500 mm / min or more and 2,000 mm / min or less while rotating a tool having a diameter of 25 mm or more and 30 mm or less to 8,000 rpm or more and 20,000 rpm or less. Depth of 0.02 ~ 0.2mm is suitable and the side surface of the glass material is preferably a straight line or a gentle curved shape, or a portion having a shape protruding from a straight or gentle curved surface.

The curved polishing step is to grind the glass material object while moving at a feed rate of 30 mm / min or more and 800 mm / min or less while rotating a tool having a diameter of 0.7 mm or more and 2 mm or less to 30,000 rpm or more and 50,000 rpm or less. The depth of 0.02 ~ 0.15mm is suitable and the side surface of the glass material has an inner diameter of 2.5mm or less, or a part that has a shape recessed to a radius of curvature of 2.5mm or less from a straight or gentle curved surface. It is preferable.

When the outer shell of the workpiece has a simple shape in the grinding of the outer shell of the workpiece, it is processed quickly by applying the linear abrasive grinding stage having a higher feed speed than the curved sub-polishing stage, and has a curvature radius of 2.5 mm or less. When fine precision machining is required, such as an outer shell having a recessed portion or an inner diameter of 2.5 mm, it is preferable to apply a curved part polishing step to process stably.

The straight part polishing step is possible to grind the tool size, the number of revolutions, as quickly and stably as possible, taking into consideration the thickness of the glass material to be processed and the contact area, so as to be suitable for grinding the straight part with little interference between the tool and the workpiece. The curved part polishing step provides a range of rotational speeds, and the tool part can be stably polished in consideration of the thickness of the workpiece and the contact area, so as to be suitable for grinding a large portion of interference between the tool and the workpiece. Number and rotational speed range.

A straight line or a gentle curved shape suitable for applying the linear sub-polishing step means a relatively simple shape with a curvature radius of 2.5 mm suitable for applying the sub-polishing step, and is processed like a screen display of a mobile phone. The shape of the object includes a simple outer shape, such as a rectangle or oval with rounded corners.

The shape having a radius of curvature of 2.5 mm or less suitable for applying the curved part polishing step means that when the object to be processed has the same internal angle as the through hole, the internal angle has the shape of a circular through hole having a diameter of 5 mm or less, or 5 mm or less. It includes an elliptical shape having an inner diameter, and includes the same shape as the depression is formed in the size of 5mm or less on the outer surface of the object.

Accordingly, when polishing an object having a complex outer shape or a complex shape of the outer and inner angles, it is preferable to apply a straight part polishing step and a curved part polishing step together as in the third embodiment. The application of the sub-polishing step and the curved sub-polishing step may vary depending on the shape and the specific size of the object to be processed.However, it is appropriate to consider the contact area between the tool and the object and consider the productivity. You should be able to implement speed.

The surface speed at the contact portion between the tool and the glass material is changed according to the diameter and the number of rotations of the tool. The straight part polishing step and the curved part polishing step have a certain range while making a difference in the diameter and the rotation speed of the tool. As the surface speed is realized, even when the straight part polishing step and the curved part polishing step are applied in parallel according to the shape of the object to be processed, the entire side surface of the object may be ground to a certain quality.

The range of tool size, rotational speed, and feed speed presented in the straight part polishing step and the curved part polishing step is actually the result of the final derivation by consideration of repeated experiments. In grinding, by differentiating and appropriately adjusting the number of rotations of the tool and the tool according to the side portion and shape of the small sheet glass, it can be applied to the overall processing of small sheet glass materials of various shapes that require precise processing.

In the adsorption fixing step, the shape and position of the small sheet glass are constantly recognized and numerically controlled by CNC, and the tool and the number of rotations are automatically exchanged by applying ATC in the straight part polishing step and the curved part polishing step. And, if adjusted, it can be repeatedly and polished at a lower cost than that produced by laser processing, and it is expected to be applied to replace the entire plastic material mounted on small electronic devices by mass production. .

In the grinding process, cutting oil is used to prevent problems caused by friction and heat generation between the glass material object and the tool. In the fourth embodiment of the present invention shown in FIG. The coolant used in the step has a configuration including a coolant removal step, a coolant transfer step, a coolant collecting step, and a coolant discharge step.

In the cutting oil removing step, high-pressure air is sprayed onto the glass material object after the grinding process is finished, and the cutting oil on the glass material object is pushed out to the processing table side, and the cutting oil is removed from the glass material object in the cutting oil transfer step. A vacuum pump is used to move to a designated path. In the cutting oil collecting step, the cutting oil being transported is accumulated and collected in the auxiliary tank. In the cutting oil discharge step, the cutting oil accumulated in the auxiliary tank is discharged.

The auxiliary tank is the case 10, the inlet 20, the air outlet 30, the level sensor 40, as shown in Figure 5, 6 to be adapted to the cutting oil collection step and the cutting oil discharge step The case 10 is provided on the conveying path of the cutting oil so that the discharge valve 50 and the barrier rib 60 may be prevented and accumulated therein by inhibiting the conveying of the cutting oil being conveyed. Air and cutting oil are introduced into the case 10 through the 20 and the air is discharged to the air outlet 30. When the cutting oil is accumulated in the case 10 or more, the level sensor 40 is stored. Sensing and adjusting the discharge using the discharge valve 50 installed on the bottom of the case (10).

The case 10 of the auxiliary tank receives the cutting oil being transferred along with the air flow due to the pressure difference together with the air through the inlet 20 installed at one end thereof, and together with the air in the case 10. It provides an inner space portion of the shape extending along the flow path of the cutting oil and air to reduce and cancel the kinetic energy of the cutting oil being transferred to the air outlet 30 and to be stagnant.

The air outlet 30 provides a path capable of upwardly discharging at the other end opposite to the inlet 20 to prevent passage of cutting oil, which is relatively heavy compared to air, to allow passage of only air, and the level sensor 40 generates a signal to the discharge valve 50 by generating a signal when the cutting oil is accumulated in the case more than a predetermined capacity to automatically adjust the discharge or detect the detection signal of the level sensor 40 from the outside Check and respond.

The barrier rib 60 is a component for more effectively stagnating the cutting oil in the case 10, and prevents smooth movement of the cutting oil from the case 10 to the air outlet 30, thereby reducing the energy of the cutting oil. It is installed to cross the straight extension path from the inlet 20 to the air outlet (30) to promote the consumption and to have the effect of extending the transport path in the case (10).

When the transfer path of air and cutting oil in the case 10 has a horizontal direction, the barrier rib 60 has a shape in which a plurality of plates are vertically upright on the transfer path, and the air discharge port 30 is directed toward the air outlet 30. The movement of the air and the cutting oil movement toward the discharge valve 50 side are provided with a free space between the inner wall of the case 10 and mutually.

As described above, the coolant conveyed with the air to the vacuum pump is stagnated, accumulated and discharged in the auxiliary tank, thereby preventing the inflow of the coolant into the vacuum pump, thereby preventing damage to the motor and cylinder of the vacuum pump due to the coolant inflow. The lifetime of the expensive vacuum pump can be maintained, and the collection and processing of cutting oil can also be easily performed.

According to the present invention by the above-described configuration, in polishing the side surface of the small thin glass having a thickness of 1 mm or less, according to the side portion and the shape of the small thin glass, the rotation speed and the feed rate of the tool are appropriately adjusted. By adjusting and applying, there is an effect that the compact thin glass material of various shapes requiring precise processing can be polished with excellent quality.

In addition, when applied to a tool and an equipment that can automatically change and adjust the rotation speed of the tool, it is possible to stably and continuously mass produce small thin glass parts, thereby contributing to the enhancement of small electronic devices at a low cost. It works.

In addition, there is another effect that it is possible to prevent damage to the motor and cylinder of the vacuum pump due to the cutting oil flow by having a secondary tank for stagnating and accumulating the cutting oil transferred to the vacuum pump side to block the flow of cutting oil into the vacuum pump.

Claims

An adsorption fixing step of vacuum-sorption of the glass material object having a thickness of 1 mm or less cut into a predetermined shape and fixed at a predetermined position;

A straight part polishing step for polishing the side of the glass material object while moving at a feed rate of 500 mm / min or more and 2,000 mm / min or less while rotating a tool having a diameter of 25 mm or more and 30 mm or less to 8,000 rpm or more and 20,000 rpm or less. Small thin glass grinding method

The method of claim 1,

Small thin glass grinding method characterized in that the side surface of the glass material has a straight or gentle curved shape

The method of claim 1,

The side of the glass material object is a small thin glass grinding method characterized in that it has a shape projecting from a straight or smooth curved surface

Including a curved polishing step for polishing the side of the glass material object while moving at a feed rate of more than 30mm / min 800mm / min while rotating a tool of less than 0.7mm 2mm or less than 30,000rpm or more than 50,000rpm; Small thin glass grinding method characterized in that the configuration

The method of claim 3,

The side of the glass material object is a small thin glass grinding method, characterized in that the inner diameter of the curvature radius less than 2.5mm

The method of claim 3,

Small side glass grinding method characterized in that the side of the glass material has a shape recessed in a radius of curvature of 2.5mm or less from a straight or gentle curved surface

A straight line for grinding a straight or lateral surface of the glass material object while moving a tool with a diameter of 25 mm or more and 30 mm or less at a feed rate of 500 mm / min or more and 2,000 mm / min or less while rotating a tool of 8,000 rpm or more and 20,000 rpm or less. Sub-polishing step;

A curve that polishes the side surface having a radius of curvature of 2.5mm or less of the glass material object while moving a tool of 0.7mm or more and 2mm or less at a speed of 30mm / min and 800mm / min while rotating a tool of 3mm or more and 50,000mm or less. Sub-polishing step; compact thin glass grinding method comprising a

The method according to any one of claims 1 to 7,

A cutting oil removing step of spraying high-pressure air to remove cutting oil from the glass material object;

A cutting oil transfer step of moving the cutting oil separated from the glass material object to a designated path using a vacuum pump;

A cutting oil collecting step of accumulating and collecting the cutting oil being transferred in an auxiliary tank installed on a cutting oil feeding path;

Small thin glass grinding method further comprises; cutting oil discharge step of discharging the cutting oil accumulated in the auxiliary tank more than a predetermined capacity;

The method of claim 8, wherein the auxiliary tank,

A case provided with an inner space portion of a shape which reduces and cancels the kinetic energy of the cutting oil being transferred and is extended to be stagnant;

An introduction port provided at one end of the case such that the cutting oil and air being transferred to the vacuum pump are introduced into the case;

An air outlet provided at the other end of the case so that air introduced into the case can be discharged upwardly;

A level sensor for generating a signal by detecting cutting oil accumulated in a predetermined capacity in the case;

A discharge valve installed at the bottom of the case to discharge discharge the accumulated cutting oil in the case;

A small thin glass grinding method comprising: a barrier rib installed across the straight extension path from the inlet to the air outlet so as to prevent movement of the cutting oil from the inside of the case to the air outlet side