TW201518031A - Method for making hole in rigid brittle plate and device thereof - Google Patents

Abstract

The present invention provides a method for making a hole in a rigid brittle plate and a device thereof. The following technical solution is obtained: A through-hole can be efficiently made in a machining process of a glass plate, particularly a small and thin tempered glass plate, without breaking or causing notches generated at an edge of the hole. Two hole-making grinding wheels that are arranged on the same axis with front ends opposite to each other are simultaneously or alternately advanced toward a rigid brittle plate disposed therebetween so as to make blind holes in two opposite surfaces in such a way that their depths are simultaneously or alternately increased, thereby forming a through-hole. The device comprises a pair of hole-making grinding wheels and a rotation driving device thereof and a feeding device. The pair of hole-making grinding wheels is axially supported on a pair of grinding wheel carriages that are individually and reciprocally movable along an axial direction by means of the feeding device, or it is mounted, in an axially supported manner, on an elevation platform that successively increases the distance of reciprocal movement in the axial direction.

Description

Perforation method and device for hard brittle board

The present invention relates to a method and apparatus for penetrating through holes in glass sheets and other hard brittle boards, and therefore particularly relates to a technique for preventing breakage of hard brittle sheets during perforation.

Generally, when a through hole is formed in a sheet material, a perforating device having a perforating tool (drill or rod-shaped grinding wheel) for rotating is used, and the axis of the perforating tool is positioned at a perforation position of the sheet material, so that the perforating tool is rotated while facing The sheet enters, passing from one side of the sheet to the other.

When the plate is a glass plate, a cylindrical grinding wheel (perforated grinding wheel) is used as a perforating tool. When a through hole is formed by the above method using a perforated grinding wheel, a portion of the sheet surface and the edge of the through hole on the extraction side of the tool (the side opposite to the side where the tool enters) is called tipping. gap. If the notch is small, the notch can be removed by chamfering the edge of the through hole after the perforation. However, if a large gap which cannot be removed by chamfering is generated, the processing is unsatisfactory.

As a method of preventing a notch from being formed on the side of the perforated grinding wheel, the following method has been proposed. That is, the two perforated grinding wheels opposed to the front end are disposed on the same axis via the glass plate. Further, a perforated grinding wheel (preemptive grinding wheel) is used to open a bottomed hole (a hole that does not penetrate) from the one side of the glass plate to the middle of the thickness of the plate. Next, after the preceding grinding wheel is retracted, another piercing grinding wheel (rear grinding wheel) is inserted from the other side of the glass plate, and communicates with the bottomed hole opened by the preceding grinding wheel to form a through hole.

For example, in Patent Document 1, a through hole is formed by a step of forming a first concave portion on one surface of a sheet material using a first hollow drill, wherein the first hollow drill is provided on an outer circumference of a front end portion a tapered portion that tapers toward the front end; and a step of penetrating the through hole from the other side of the sheet by the second hollow drill, wherein the second hollow drill is disposed coaxially opposite the first hollow drill, and the second hollow The outer diameter of the drill is larger than the inner diameter of the first hollow drill and smaller than the diameter of the edge portion of the first recess on the surface of the glass sheet.

Further, in Patent Document 2, after the drill bit is inserted from the lower surface of the glass sheet in the thickness direction to form the bottomed hole, the preceding drill is retracted, and then the trailing drill is disposed coaxially with the preceding drill from the glass plate. The upper surface enters to form a through hole in the glass plate.

CITATION LIST Patent Literature Patent Literature 1: JP-A-2008-44178 Patent Document 2: JP-A-2011-111370

With the spread of the portable terminal, in order to reduce the weight and thickness of the portable terminal, the thickness of the display panel for the portable terminal is required to be reduced. In order to reduce the thickness of the substrate, a tempered glass is used as the substrate glass of the display panel, and it is necessary to perform a process of forming a through hole in a small thin tempered glass sheet.

The inventors of the present application have attempted to provide a through hole in a thin tempered glass sheet by the conventional means as described above. However, when the perforated grinding wheel is introduced from one side of the glass sheet, a problem occurs in that the glass sheet is broken at the time when the leading end of the perforated grinding wheel exceeds the center of the thickness of the glass sheet. The breakage of the glass sheet does not cause a gap at the edge of the pull-out side of the perforated grinding wheel, but a crack is generated from the hole to the both sides during the perforating process, causing the glass sheet itself to break.

An object of the present invention is to provide a technical means for breaking a glass sheet which occurs during the processing when a through hole is formed in a tempered glass sheet. That is, the object of the present invention is to provide a technical means for preventing the glass sheet, particularly the small and thin tempered glass sheet from being broken during processing, and not forming a notch at the edge of the hole, thereby enabling high efficiency Open through holes.

According to the present invention, two perforated grinding wheels 1 (1a, 1b, 1c) and 2 (2a) are disposed on the same axis a so as to face each other with a hard brittle sheet 3 which is easily broken during perforation by a tempered glass sheet or the like. 2b, 2c) entering the hard brittle sheet 3 simultaneously or repeatedly alternately, opening the bottomed holes 31, 32 having a depth that is not connected from the two faces of the hard brittle sheet 3, by making the depth of the bottomed holes simultaneously or alternately This increases, thereby connecting the bottomed holes 31 and 32 on both sides to form the through hole 33.

The perforating device of the rigid brittle plate of the present invention comprises: a pair of perforated grinding wheels 1, 2 which are arranged on the same axis a so that the front ends are opposed to each other; and rotary driving devices 8, 9 which wind the perforated grinding wheels 1, 2 The axis a rotates; and the feed means 4, 5 or the lifting device 16 which also serves for feeding, which advances and retreats the perforated grinding wheels 1, 2 in the direction of the axis a. The pair of perforated grinding wheels 1, 2 are axially supported by a pair of wheel holders 6, 7 which are individually reciprocated in the direction of the axis a, or are supported by a lifting table 18 which reciprocates in the direction of the axis a. According to the former configuration, the pair of feeding devices 4, 5 allow the pair of wheel heads 6, 7 to simultaneously enter each other toward the other side. According to the latter configuration, the elevating device 16 that also serves for feeding advances the elevating table 18 repeatedly while increasing the reciprocating distance.

According to the above configuration, the pair of perforated grinding wheels 1, 2 are moved forward and backward simultaneously or repeatedly toward the hard brittle sheet 3 placed between them, and the front ends of the perforated grinding wheels 1, 2 make the two faces of the hard brittle sheet 3 at the time of entry. The depths of the bottomed holes 31 and 32 are simultaneously or alternately increased. Finally, the two bottomed holes 31 and 32 are communicated with each other at the intermediate portion of the thickness of the rigid brittle plate 3, and the through holes 33 are bored in the rigid brittle plate 3.

Effect of the invention

According to the present invention, the bottom holes 31 and 32 are formed at substantially the same depth from both faces of the rigid brittle plate 3, and the through holes 33 are formed by connecting the bottomed holes on both sides to the intermediate portion of the thickness of the rigid brittle plate 3. Therefore, it can be considered that the balance of the stress inside the glass sheet at the periphery of the bottomed holes 31, 32 is maintained, and the breakage during the perforation can be prevented.

The processing of the through hole of the present invention is such that a bottom hole is formed from both sides of the rigid brittle plate, and a hole depth of the bottomed holes on both sides is increased to form a through hole. Therefore, there is an effect that not only a large notch can be prevented from occurring at the edge of the hole on the drawing side of the tool, but also breakage during the processing of the bottomed hole can be avoided in the processing of the display panel substrate of the tempered glass sheet. Stable perforation is possible.

Further, it is not necessary to reduce the processing speed in order to avoid a large gap or breakage, and it is possible to prevent the processing efficiency from being lowered. Further, when the tool is simultaneously introduced from both sides of the surface of the rigid brittle plate, the bottomed hole is simultaneously processed from both surfaces of the plate, so that the processing time can be shortened and the perforation process can be performed. The effect of internal stress equalization on the hard brittle sheet is large, and the effect of breaking the glass sheet during the perforation process is large.

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing a main part of a perforating apparatus of the present invention, and is a view showing a main part of an apparatus for performing grinding and perforation of a peripheral edge of a glass plate for a display of a portable terminal.

The processed tempered glass sheet 3 is adsorbed to the table 11 by vacuum pressure, and the table 11 is provided at the upper end of the workpiece shaft that is driven to rotate about the vertical axis a. A vertical feed stage 14 is provided on the illustrated mechanical frame, and the horizontal feed stage 14 is screwed with the feed screw 13 driven to be rotated by the infeed motor 12 in the left-right direction in the drawing (X The axis direction) is determined to move the position. A guide member 15 and a lifting motor 16 in a vertical direction (Z direction) are provided on the infeed table 14, and an elevating table 18 is provided, which is guided by the guide member 15 to be driven to rotate by the elevating motor 16. The feed screw 17 is screwed to raise and lower.

Grinding wheel holders 6 and 7 are provided at an upper portion and a lower portion of the lifting table 18. Each of the wheel heads 6 and 7 is guided by a guide provided in the vertical direction of the elevating table 18, and is screwed up and lowered separately from the feed screw (not shown) that is driven to rotate by the feed motors 4 and 5, respectively. Grinding wheel motors 8, 9 are respectively disposed on the upper and lower wheel heads 6, 7, and the front end of the rotor shaft of the grinding wheel motor is a grinding wheel shaft, and perforated grinding wheels 1, 2 are attached to the front end. The upper and lower grinding wheel motors 8, 9 are disposed such that the rotor shaft is located on the same axis a in the vertical direction.

The controller that controls the lift motor 16, the feed motors 4, 5, and the grinding wheel motors 8, 9 includes a rotation command unit that rotates the lift motor 16 and the feed motors 4, 5 individually and forwardly, and further includes: a synchronous feed unit that synchronously rotates the feed motors 4, 5 in the direction of entry of the grinding wheels 1, 2; a stroke setting unit that positions the front ends of the grinding wheels 1, 2 at the origin positions of the wheel holders 6, 7 The interval s is set; and the synchronous rotation command unit causes the grinding wheel motors 8, 9 to rotate synchronously in the same direction (the direction of rotation viewed from the output shaft side of each motor is the reverse direction). The interval s between the front ends of the perforated grinding wheels 1, 2 drives the feed motors 4, 5 in the direction of entry of the perforated grinding wheels 1, 2, for example, in the torque limiting state, and the feed motors 4, 5 when the torque limiter is operated. The total number of revolutions is set to the stroke setting unit as the rotational speed of the feed motor.

A grinding wheel that grinds the outer circumference of the glass sheet 3, a grinding wheel that performs chamfering, and a motor that drives the rotation of the grinding wheel are attached to the infeed table 14, but these grinding wheels are not shown in the drawings.

In addition to the hole processing of the glass plate 3, the elevating table 18 is raised by the elevating motor 16, and is retracted to an upper position that does not interfere with the glass plate 3. When a through hole is formed in the glass plate 3, the lateral feed stage 14 is moved to the left position in FIG. 1 where the grinding wheel motors 8, 9 and the glass plate 3 do not interfere, and the lifting table 18 is lowered into a glass. The plate 3 is located at exactly the middle of the two grinding wheels 1, 2, and then, by the movement of the lateral feed table 14 in the right direction in Fig. 1 and the rotation of the table 11, the axis a of the grinding wheel is as shown in Fig. 1. Positioned at the perforation of the glass plate 3.

Then, while the elevating table 18 is stopped, the upper and lower grinding wheel motors 8 and 9 are simultaneously rotated by the synchronous rotation command unit, and the upper grinding wheel base 6 and the lower grinding wheel base 7 are simultaneously downward and Feed in the top to start piercing.

The perforation is performed in the order shown in (a) to (e) of Fig. 2 . In other words, the perforated grinding wheels 1 and 2 facing the upper and lower sides of the tempered glass sheet 3 are introduced into the tempered glass sheet 3, and the bottom and bottom holes are simultaneously processed from the upper and lower surfaces of the tempered glass sheet 3 by the upper and lower grinding wheels 1 and 2 ( (b) of Figure 2. The rotational speeds and the entry speeds of the upper and lower grinding wheels 1 and 2 are equal, but the moments at which the tips of the upper and lower grinding wheels 1 and 2 are in contact with the surface of the tempered glass sheet 3 need not be strictly simultaneous, and may be temporally deviated. By continuing the movement of the upper and lower grinding wheels 1, 2, the bottomed holes 31, 32 are simultaneously machined on both faces of the tempered glass sheet 3.

When the number of revolutions obtained by totaling the rotational speeds of the upper and lower feed motors 4 and 5 after the start of the perforation reaches the number of revolutions set in the stroke setting unit, one of the feed motors 4 and 5 is advanced (in the example of FIG. 2, The motor 4) is reversed and the other side continues to rotate, or the rotation of the feed motors 4, 5 is simultaneously stopped, and the lift table 18 is moved upward or downward by the lift motor 16 (upward movement in the example of Fig. 2) ) ((d) of Figure 2). By this operation, the perforated grinding wheel (the perforated grinding wheel 2 in the example of FIG. 2) that continues to enter is connected to the upper and lower bottomed holes 31 and 32 to form the through hole 33. Then, the perforated grinding wheel (the perforated grinding wheel 2 in the example of FIG. 2) that has passed through is retracted by the reverse rotation of the feed motor ((e) of FIG. 2), and the processing of one through hole 33 is completed.

After the processing of the number of through holes of the command is completed, the lateral feed table 14 is moved to a position where the grinding wheel motors 8 and 9 and the glass plate 3 do not interfere with each other, and then the lifting table 18 is moved upward to complete the processing step of the through holes.

Preferably, the perforated grinding wheel on one side (the perforated grinding wheel 2 in the example of FIG. 2) has a slightly larger diameter (degree of machining grinding allowance) than the other grinding wheels (in the example of FIG. 2, the perforated grinding wheel 1) )diameter of. According to this, it is possible to prevent streaks or the like from occurring at the joint portion between the upper and lower bottomed holes 31 and 32 due to the error in the diameter of the grinding wheel of the upper and lower perforated grinding wheels 1 and 2 and the error in the axial center.

The upper and lower perforated grinding wheels 1 and 2 may be solid grinding wheels (grinding wheels without hollow holes), hollow grinding wheels (grinding wheels with hollow holes, Fig. 3), or one side may be solid and the other side It is a hollow grinding wheel. Further, as shown in FIG. 4, one of the hollow grinding wheels 1b may be formed, and the other one may be a solid grinding wheel 2b having a distal end portion 21 inserted into a hollow hole of the hollow grinding wheel 1b. Further, by using the piercing grinding wheels 1c and 2c having the conical portion 22 on the proximal end side as shown in FIG. 5, the through holes can be opened in the above-described steps, and the upper and lower grinding wheels 1c and 2c can be individually accessed. The edge of the through hole obtained by perforating the conical portion 22 is chamfered.

Further, after the through hole is pierced, the through-hole perforated grinding wheel (the perforated grinding wheel 2 in the example of FIG. 2) is kept rotated in the through state, and the movement of the lateral feed table 14 and the rotation of the table 11 are performed. Therefore, the long hole 34 as shown in FIG. 6 and the through hole 35 of various shapes having a diameter larger than the diameter of the grinding wheel can be opened. In this case, when the perforated grinding wheel having the conical portion 22 on the proximal end side as shown in FIG. 5 is used, the chamfered portion 36 can be formed on the edge of the formed long hole 34 and the large diameter through hole 35.

Fig. 7 is a view showing a main part of a second embodiment of the perforating device of the present invention. In the apparatus of Fig. 7, the wheel heads 6, 7 and their feed motors 4, 5 in the apparatus of Fig. 1 are not provided, and the grinding wheel motors 8, 9 of the upper and lower grinding wheels 1, 2 are mounted directly at the front end of the rotor shaft. At the upper and lower positions of the lifting platform 18. The interval s between the upper and lower grinding wheels 1 and 2 is fixed, and the lifting motor 16 of the second embodiment also serves as a feed motor for alternately advancing and retracting the grinding wheels 1 and 2. The other structure is the same as that of Fig. 1.

According to the apparatus of the second embodiment, the elevating table 18 is repeatedly reciprocated up and down, and the reciprocating movement stroke thereof is sequentially increased, thereby alternately piercing the bottomed holes on both sides of the surface of the tempered glass sheet 3, and sequentially The hole depth of the bottomed hole on both sides is increased, so that a through hole is bored in the strengthened glass plate 3.

FIGS. 8 and 9 (a) to (g) are views for explaining a punching operation of the through hole of the device of FIG. 7. As in the case of the first embodiment, the elevating table 18 is lowered to a position where it does not interfere with the glass plate 3, and the movement of the lateral feed table 14 and the rotation of the table 11 are used to make the grinding wheel as shown in FIG. The axis a coincides with the position of the perforation of the glass sheet 3.

Then, the depth of the bottomed hole perforated by the grinding wheel at the stroke end when the upper and lower grinding wheels 1 and 2 enter the tempered glass plate 3 is a stroke that does not penetrate the depth of the tempered glass sheet 3, and each time the lifting table 18 is pressed The stroke in which the depth is sequentially deepened during the reciprocating operation causes the elevating table 18 to reciprocate up and down. Thus, as shown in FIGS. 8(b) to 9(e), the depths of the bottomed holes 31 and 32 which are perforated from both sides are sequentially deepened, and finally, the upper and lower bottomed holes are cut by any one of the grinding wheels. The wall between 31 and 32 forms a through hole. Therefore, as shown in FIG. 9(f), the tempered glass sheet 3 is penetrated by one grinding wheel 2 (or 1), and the lifting table is returned to the initial state, thereby forming the through hole 33.

The structure of this second embodiment has a feature that can simplify the structure of the device. On the other hand, in the structure of the first embodiment, the device structure becomes complicated, but since the machining force balance acting on the axial direction of the grinding wheel of the tempered glass sheet 3 during the machining is balanced, it is possible to more reliably avoid the machining process. The glass plate broke.

1 (1a, 1b, 1c) ‧‧‧ perforated grinding wheel
2 (2a, 2b, 2c) ‧‧‧ perforated grinding wheel
3‧‧‧Strengthened glass plate
4, 5‧‧‧ feed motor
6, 7‧‧‧ wheel seat
8, 9‧‧‧ grinding wheel motor
11‧‧‧Workbench
12‧‧‧Transverse feed motor
13‧‧‧Feed screw
14‧‧‧Horizontal feed table
15‧‧‧Guide
16‧‧‧ Lifting motor
17‧‧‧ Feeding screw
18‧‧‧ Lifting platform
21‧‧‧ front end
22‧‧‧Cone
31, 32‧‧‧Bottom hole
33‧‧‧through holes
34‧‧‧ long hole
35‧‧‧through holes
36‧‧‧Chamfering
A‧‧‧ vertical axis
S‧‧‧ interval

Fig. 1 is a side view showing a main part of a first example of a perforating device. 2(a) to 2(e) are explanatory views showing a processing procedure of the apparatus of Fig. 1. Fig. 3 is a view showing an example of a hollow cylindrical perforated grinding wheel. 4 is a view showing an example of a solid cylindrical and hollow cylindrical grinding wheel. FIG. 5 is a view showing an example of a grinding wheel that performs perforation and chamfering. Fig. 6 is a view showing an example of an elongated hole formed in a glass plate. Fig. 7 is a side view showing a main part of a second example of the perforating device. Fig. 8 is an explanatory view showing the first half of the processing steps of the apparatus of Fig. 7. Fig. 9 is an explanatory view showing the latter half of the step.

1‧‧‧Perforated grinding wheel

2‧‧‧Perforated grinding wheel

3‧‧‧Strengthened glass plate

31, 32‧‧‧Bottom hole

33‧‧‧through holes

A‧‧‧ vertical axis

S‧‧‧ interval

Claims (6)

A method for perforating a rigid brittle plate, characterized in that two perforated grinding wheels are disposed on the same axis so as to face each other with a hard brittle plate through which a through hole is to be formed, and the two perforated grinding wheels are used from the hard The bottom surface of the brittle plate is provided with a bottom hole, and the depths of the bottomed holes on both sides are sequentially increased, thereby connecting the bottomed holes on the two sides. The perforation method of the rigid brittle plate according to claim 1, wherein the two perforated grinding wheels are simultaneously introduced toward the hard brittle plate in the same manner of the rotation direction and the rotation speed about the axis, and simultaneously increased The depth of the bottomed holes on both sides. The method of perforating a rigid brittle plate according to claim 1, wherein the two perforated grinding wheels having an interval between the leading ends set to a predetermined interval alternately face the rigid brittle plate and increase the inflow stroke thereof. The large one is repeatedly entered at the same time, thereby sequentially increasing the depth of the bottomed holes on the both sides. A perforating device for a rigid brittle plate, the perforating device of the rigid brittle plate comprising: a pair of perforated grinding wheels disposed on the same axis in such a manner that the front ends are opposed; and a feeding device that causes the perforated grinding wheels to follow Advancing and retreating in the axial direction, and performing the advancing and retracting by rotating the pair of perforated grinding wheels about the axis, thereby penetrating through holes on a rigid brittle plate positioned between the pair of perforated grinding wheels, the hard The perforating device of the brittle plate is characterized in that the pair of perforated grinding wheels are simultaneously or alternately introduced toward the hard brittle plate, thereby forming a bottom hole on both faces of the hard brittle plate, by making these The hole depth of the bottom hole is simultaneously or alternately increased, so that the two bottomed holes communicate with each other at the intermediate portion of the thickness of the hard brittle plate, whereby the through hole is bored in the hard brittle plate. A perforating device for a hard brittle plate according to claim 4, wherein the pair of perforated grinding wheels are axially supported by a pair of wheel heads that simultaneously enter each other toward the opposite side in the axial direction . The perforating device for a rigid brittle plate according to claim 4, wherein the pair of perforated grinding wheels are axially supported by a lifting table which is also used for feeding the grinding wheel, and the lifting table is performed while sequentially increasing the reciprocating distance Reciprocating.