JP2015085646A - Punch for hard brittle plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide technical means of opening a through hole efficiently without breaking or chipping on the edge of holes during processing a glass plate, especially a small and thin tempered glass plate.SOLUTION: A punch for hard brittle plates forms a through hole by causing two punch grinders arranged, with their tips facing each other on the same axial line, to advance simultaneously or repeatedly and alternately toward a hard, brittle plate placed between the punch grinders so as to form bottomed holes from both sides and increasing the depth of the holes simultaneously or alternately and is provided with a pair of the punch grinders, a rotation drive unit and a movement unit. The punch grinders are supported pivotally to a pair of grinder bases which are reciprocated separately in the axial line direction by the movement device or to a single reciprocative base which increases gradually the reciprocation distance in the axial line direction.

Description

  The present invention relates to an apparatus for drilling through holes in a glass plate or other hard brittle plate, and more particularly to a drilling device that prevents breakage of a hard brittle plate during drilling.

  Normally, when making a through hole in a plate material, use a drilling device equipped with a drilling tool (drill or rod-shaped grindstone) that rotates around the axis line, while positioning the axis at the drilling position of the plate material and rotating the drilling tool. Drilling is performed by advancing toward the plate and passing it from one side of the plate to the other.

  When the plate material is a glass plate, a solid or hollow cylindrical grindstone (drilling grindstone) is used as the drilling tool. However, if the through hole is opened by the above general method, the tool removal side (tool Chipping called chipping occurs in the edge portion between the plate material surface and the through hole on the side opposite to the side on which the metal enters. If the chipping is small, the chipping can be removed by chamfering the edge of the through hole performed after drilling. However, if a large chipping that cannot be removed by this chamfering process occurs, a defective product is obtained.

  Therefore, as a means to prevent chipping on the side where the tool comes off, two drilling grindstones with their tips facing each other on the same axis with the glass plate to be drilled in between are arranged, and one drilling grindstone (preceding tool) is used. Open a bottomed hole with a depth reaching the middle of the plate thickness from one side of the glass plate, retreat the preceding tool, and then advance the other drilling wheel (following tool) from the other side of the glass plate surface to advance the tool. There has been proposed means for opening a through hole by communicating with a bottomed hole having a hole.

  For example, in Patent Document 1, a step of forming a first recess on one surface of a plate material using a first core drill having a tapered portion whose outer periphery of the tip portion is reduced in diameter toward the tip portion, and an outer diameter dimension The second core drill is larger than the inner diameter of the first core drill and smaller than the diameter of the surface edge of the first recess, and the through-hole is concentrically opposed to the first core drill from the other surface of the plate. Through holes are formed in the step of drilling.

  Moreover, in patent document 2, it cut | disconnects from the lower end surface side of a glass plate, makes a preceding drill penetrate | invade in the thickness direction, forms a bottomed hole, and makes a preceding drill retreat, and, after that, the upper end surface side of a glass plate A through hole is formed in the glass plate by cutting a subsequent drill coaxially with the preceding drill.

JP 2008-44178 A JP 2011-111370 A

  With the recent widespread use of mobile terminals, there is a demand for thin display panels used in mobile terminals in order to reduce the weight and thickness of mobile terminals. With the demand for thinning, tempered glass has been used as a substrate glass for display panels, and it has become necessary to form a through-hole in a small thin tempered glass plate.

  The inventors of the present application tried to make a through hole in a thin tempered glass plate by the conventional means as described above. However, when the perforating grindstone is entered from one surface of the glass plate, there is a problem that the glass plate breaks when the tip of the perforated grindstone exceeds the thickness center of the glass plate. This problem is not that the edge of the drilling wheel is not chipped like a general glass plate, but the glass plate itself breaks due to cracks occurring on both sides from the hole in the middle of drilling. It is.

  Then, this invention makes it a subject to obtain the technical means which solves the problem of the fracture | rupture of the glass plate which generate | occur | produces in the middle of the process, when making a through-hole in a tempered glass plate, and it aims at obtaining the glass plate, especially small and thin tempered glass. It is an object of the present invention to obtain technical means capable of efficiently opening a through-hole without breaking the plate during processing and without causing a chip at the edge of the hole.

  In the present invention, two drilling grindstones 1 (1a, 1b, 1c), 2 (2) are arranged with their tips facing each other on the same axis a with a hard brittle plate 3 that is easily broken during drilling, such as a tempered glass plate. 2a, 2b, 2c) are simultaneously or repeatedly advanced toward the hard brittle plate 3 to open bottomed holes 31 and 32 having a depth not communicating from both sides of the hard brittle plate 3, By increasing the depth of the holes simultaneously or alternately, the bottomed holes 31 and 32 on both sides are connected to form the through holes 33.

  The drilling device for a hard and brittle plate according to the present invention has a pair of drilling stones 1 and 2 disposed on the same axis a with their tips opposed to each other, and rotational drive devices 8 and 9 around the axis a of these drilling wheels 1 and 2. And advancing and retracting devices 4, 5, and 16 for advancing and retracting the drilling stones 1 and 2 in the direction of the axis a. The pair of drilling grindstones 1 and 2 is supported by a pair of grindstone tables 6 and 7 that are individually reciprocally movable in the direction of the axis a, or one reciprocating table 18 that is reciprocally movable in the direction of the axis a. It is provided by pivotally supporting it. In the former structure, the pair of advancing and retracting devices 4 and 5 simultaneously advance and retract the pair of grindstone tables 6 and 7 toward each other. In the latter structure, the advancing / retreating device 16 repeatedly advances and retreats the carriage 18 while sequentially increasing the reciprocating distance.

  Thereby, a pair of drilling stones 1 and 2 advance or retreat alternately or repeatedly toward the hard brittle plate 3 placed between them, and are hardened by the tip of the drilling stones 1 and 2 when they advance. The hole depths of the bottomed holes 31 and 32 on both sides of the brittle plate 3 are increased simultaneously or alternately, and finally the bottomed holes 31 and 32 are communicated with each other at the intermediate thickness portion of the hard brittle plate 3 so as to be hard brittle. A through hole 33 is drilled in the plate 3.

  In drilling a tempered glass plate, if a bottomed hole is drilled from one side of the glass surface to a depth where the balance of the internal stress of the glass plate is broken, a large tensile force or shearing force is generated around the bottomed hole due to the imbalance of the internal stress. It is presumed that the glass plate breaks. In the present invention, the bottomed holes 31 and 32 are opened from both sides of the hard brittle plate 3 at the same time, that is, so as not to cause a difference in hole depth that causes imbalance of internal stress. Since the bottomed hole communicates with the middle part of the thickness of the hard brittle plate 3 to form the through hole 33, the balance of the internal stress at the peripheral edge of the bottomed holes 31 and 32 is maintained, and breakage during the drilling can be prevented. it is conceivable that.

  The machining of the through hole according to the present invention is a process of making a through hole by opening a bottomed hole from both sides of the hard brittle plate and increasing the depth of the bottomed hole on both sides. In addition to avoiding the occurrence of large chipping at the edge of the hole, it is possible to avoid breakage during the processing of the bottomed hole even in the processing of hard brittle plates that are easily broken, and the display of a tempered glass plate There is also an effect that stable perforation can be performed on the panel substrate.

  Furthermore, in order to avoid the generation of large chips and the breakage of the hard brittle plate to be processed, measures such as slowing the processing speed become unnecessary, and a reduction in processing efficiency can be prevented. In addition, the machine that works by simultaneously advancing the tool from both sides of the surface of the hard brittle plate has a great effect of balancing the stress acting on the hard brittle plate during drilling, and it is possible to drill hard brittle plates that are more likely to break. In addition, since the processing of the bottomed hole proceeds simultaneously from both sides of the plate, there is an effect that the processing time can be shortened.

Side view showing the main part of the first example of the punching device Explanatory drawing which showed the process sequence of the apparatus of FIG. Figure showing an example of a hollow cylindrical drilling wheel pair Diagram showing an example of a solid cylindrical and hollow cylindrical grinding wheel pair Diagram showing an example of a grindstone pair that performs drilling and chamfering The figure which showed the example of the long hole formed in a glass plate Side view showing the main part of the second example of the punching device Explanatory drawing which showed the first half of the processing procedure of the apparatus of FIG. Explanatory diagram showing the second half of the procedure

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a side view showing an essential part of a punching device of the present invention, and is a view showing an essential part of an apparatus for grinding and perforating the periphery of a glass plate for a display of a portable terminal.

  The tempered glass plate 3 to be processed is adsorbed and held by a vacuum pressure on a table 11 provided at the upper end of a work shaft that is rotationally driven about a vertical axis a. A machine frame (not shown) is provided with a lateral feed base 14 that is screwed to a feed screw 13 that is rotationally driven by a lateral feed motor 12 and is moved and positioned in the horizontal direction (X-axis direction) in the figure. There is provided a lifting platform 18 which is guided by a vertical guide (Z-axis direction) 15 provided on the side and is screwed up and down by a feed screw 17 which is rotationally driven by a lifting motor 16 mounted on the lateral feed platform 14. Yes.

  The lifting platform 18 is provided with grindstone platforms 6 and 7 at an upper portion and a lower portion thereof. The grindstone tables 6 and 7 are individually guided by vertical guides provided on the lifting platform 18 and screwed into feed screws (not shown) that are driven to rotate by the respective feed motors 4 and 5 and are individually moved up and down. The upper and lower grinding wheel bases 6 and 7 are provided with grinding wheel motors 8 and 9, respectively, and the tip of the rotor shaft of the grinding wheel motor serves as a grinding wheel shaft, and the drilled grinding wheels 1 and 2 are attached to the leading ends. Yes. The upper and lower grindstone motors 8 and 9 are provided with their rotor shafts on the same axis a in the vertical direction.

  A controller (not shown) for controlling the elevating motor 16, the feed motors 4 and 5, and the grindstone motors 8 and 9 includes the feed motor 4, Synchronous feed means for synchronously rotating 5 in the advancing direction of the grindstones 1 and 2, stroke setting means for setting the interval s between the tips of the grindstones 1 and 2 at the origin positions of the grindstone tables 6 and 7, and grindstone motors 8 and 9 Are synchronously rotated in the same direction (the rotation direction seen from the output shaft side of each motor is the reverse direction). The distance s between the tips of the drilling grindstones 1 and 2 is such that the grindstone motors 8 and 9 are driven in the advancing direction of the drilling grindstones 1 and 2 in a state where torque is limited, and the grindstone motors 8 and 9 when the torque limiter is activated. By adding together the rotational speeds of these, the rotational speed of the grinding wheel motor can be measured and set in the stroke setting means.

  Although the grindstone which grinds the outer periphery of the glass plate 3, the grindstone which carries out chamfering, and the motor which rotationally drives them are mounted | worn with the horizontal feed stand 14, these grindstones are not shown by figure.

  The lifting platform 18 is moved up by the lifting motor 16 and retracted to an upper position where it does not interfere with the glass plate 3 except when hole processing is performed on the glass plate 3. When opening a through hole in the glass plate 3, after moving the lateral feed base 14 to the left position in FIG. 1 where the grinding wheel motors 8 and 9 do not interfere with the glass plate 3, they are just intermediate between the grinding wheels 1 and 2. The elevator 18 is lowered so that the glass plate 3 is located at the position of the glass plate 3, and then the axis a of the grindstone is moved to the glass plate 3 by the movement of the lateral feed table 14 in the right direction in the drawing and the rotation of the table 11. Position at the drilling position.

  And while the elevator 18 is stopped, the upper and lower grinding wheel motors 8 and 9 are synchronously rotated by the synchronous rotation command means, and the upper grinding wheel platform 6 and the lower grinding wheel platform 7 are simultaneously sent downward and upward respectively. To start drilling.

  The drilling is performed in the order shown in (a) to (e) of FIG. That is, the drilling grindstones 1 and 2 that are opposed to each other at the upper and lower sides of the tempered glass plate 3 are advanced toward the tempered glass plate 3, and the bottomed holes are simultaneously processed from the upper and lower surfaces of the tempered glass plate 3 by the upper and lower grindstones 1 and 2. Perform (FIG. 2B). The rotational speed and the advance speed of the upper and lower grindstones 1 and 2 are made equal, but the moment when the tips of the upper and lower grindstones 1 and 2 come into contact with the surface of the tempered glass plate 3 do not have to be strictly at the same time. There may be a gap. By continuing the advance operation of the upper and lower grindstones 1 and 2, the bottomed holes 31 and 32 are simultaneously processed on both surfaces of the tempered glass plate 3.

  When the rotational speed obtained by adding the rotational speeds of the upper and lower feed motors 4 and 5 after the start of drilling reaches the rotational speed set in the stroke setting means, one of the feed motors 4 and 5 (in the example of FIG. 4) is reversed and the other rotation is continued, or the rotation of the feed motors 4 and 5 is stopped, and the elevator 18 is moved up or down by the elevator motor 16 (up in the example of FIG. 2) ( FIG. 2 (d)). By this operation, the drilling stone on the side that continues to advance (in the example of FIG. 2, the drilling stone 2) connects the upper and lower bottomed holes 31 and 32 to form the through hole 33. Thereafter, the penetrating grindstone (the drilling grindstone 2 in the example of FIG. 2) that has penetrated is retracted by reverse rotation of the feed motor (FIG. 2 (e)), and the machining of one through hole 33 is completed.

  When processing of the commanded number of through holes is completed, the grinding wheel motors 8 and 9 are moved to a position where they do not interfere with the glass plate 3, and then the lifting table 18 is moved up to process the through holes. Exit.

  The diameter of the piercing grindstone on the side to be penetrated (in the example of FIG. 2 pierced grindstone 2) is slightly larger than the diameter of the other grindstone (in the example of FIG. 2 piercing grindstone 1) (about the finishing grinding allowance). Is preferred. By doing so, it is possible to prevent the formation of streaks or the like at the connecting portions of the upper and lower bottomed holes 31 and 32 due to errors in the diameters of the upper and lower drilling stones 1 and 2 and errors in the axial center.

  The upper and lower perforation grindstones 1 and 2 may be a solid grindstone or a hollow grindstone (FIG. 3), and one may be a solid grindstone and the other may be a hollow grindstone. Also, as shown in FIG. 4, one is a hollow cylindrical grindstone 1b, and the other is a solid cylindrical grindstone 2b provided with a tip 21 inserted into the hollow hole of the hollow cylindrical grindstone 1b. You can also. Further, by using the drilling grindstones 1c and 2c provided with the conical portion 22 on the base end side as shown in FIG. 5, the upper and lower grindstones 1c and 2c are advanced individually after the through holes are opened in the above procedure. Further, it is possible to chamfer the edge of the through hole drilled by the conical portion 22.

  Further, after the through hole is drilled, the penetrating grindstone (pierced grindstone 2 in the example of FIG. 2) is kept in the penetrating state while the rotation of the horizontal feed base 14 and the rotation of the table 11 are maintained. The through holes 35 having various shapes larger than the long holes 34 and the diameter of the grindstone can be formed. In this case, a drilling grindstone having a conical portion 22 on the base end side as shown in FIG. 5 is advanced to a position where the conical portion 22 rubs the edge of the through hole to move the lateral feed table 14 or the table 11. Thus, it is possible to simultaneously perform chamfering 36 on one edge of the formed long hole 34 or large-diameter through-hole 35.

  FIG. 7 is a view showing a main part of a second embodiment of the punching device of the present invention. The apparatus shown in FIG. 7 is not provided with the grinding wheel bases 6 and 7 and their feed motors 4 and 5 in the apparatus shown in FIG. Are mounted directly at the upper and lower positions of the lifting platform 18. Therefore, the interval s between the upper and lower grindstones 1 and 2 is constant, and the other structure is the same as that of the apparatus of FIG.

  In the apparatus according to the second embodiment, the lifting platform 18 is repeatedly reciprocated up and down, and the reciprocating strokes are sequentially increased to alternately perforate the bottomed holes on both sides of the surface of the tempered glass plate 3. By sequentially increasing the depth of the bottomed holes, through holes are drilled in the tempered glass plate 3.

  FIGS. 8A to 9G are views for explaining a through-hole drilling operation in the apparatus of FIG. As in the case of the first embodiment, the lifting platform 18 is lowered at a position where it does not interfere with the glass plate 3, and the axis a of the grindstone is set to the drilling position of the glass plate 3 by moving the lateral feed table 14 and rotating the table 11. To match.

  Next, the stroke is such that the depth of the bottomed hole drilled with the grindstone at the stroke end when the upper and lower grindstones 1 and 2 advance toward the tempered glass plate 3 is a depth that does not penetrate the tempered glass plate 3; The lift 18 is lifted and lowered by a stroke in which the depth is gradually increased every time the lift 18 is reciprocated. Then, as shown in FIGS. 8B to 9E, the depths of the bottomed holes 31 and 32 drilled from both sides are sequentially increased, and finally, the upper and lower bottomed holes 31 are formed by one of the grindstones. , 32 are cut away to form through holes. Therefore, thereafter, as shown in FIG. 9F, the through hole 33 is formed by penetrating the tempered glass plate 3 with one of the grindstones 2 (or 1) and returning the lifting platform to the initial state.

  The structure of the second embodiment is characterized in that the device structure can be simplified. On the other hand, the structure of the first embodiment has a complicated device structure, but the processing force in the grinding wheel axis direction acting on the tempered glass plate 3 is balanced during the processing, so that the glass plate is more reliably broken during the processing. Can be avoided.

DESCRIPTION OF SYMBOLS 1 (1a, 1b, 1c) Perforation grindstone 2 (2a, 2b, 2c) Perforation grindstone 3 Tempered glass plate 4, 5 Feed motor 6, 7 Grinding wheel base 8, 9 Grinding wheel motor 16 Lifting motor 18 Lifting base 31, 32 Bottom Hole 33 Through hole a Vertical axis

The drilling device for a hard and brittle plate according to the present invention has a pair of drilling stones 1 and 2 disposed on the same axis a with their tips opposed to each other, and rotational drive devices 8 and 9 around the axis a of these drilling wheels 1 and 2. And advancing and retracting devices 4, 5, and 16 for advancing and retracting the drilling stones 1 and 2 in the direction of the axis a. The pair of drilling grindstones 1 and 2 is supported by a pair of grindstone tables 6 and 7 that are individually reciprocally movable in the direction of the axis a, or one lift 18 that is reciprocally movable in the direction of the axis a. It is provided by pivotally supporting it. In the former structure, the pair of advancing and retracting devices 4 and 5 simultaneously advance and retract the pair of grindstone tables 6 and 7 toward each other. In the latter structure, the advancing / retreating device 16 repeatedly advances and retracts the lifting platform 18 while sequentially increasing the reciprocating distance.

A controller (not shown) for controlling the elevating motor 16, the feed motors 4 and 5, and the grindstone motors 8 and 9 includes the feed motor 4, Synchronous feed means for synchronously rotating 5 in the advancing direction of the grindstones 1 and 2, stroke setting means for setting the interval s between the tips of the grindstones 1 and 2 at the origin positions of the grindstone tables 6 and 7, and grindstone motors 8 and 9 Are synchronously rotated in the same direction (the rotation direction seen from the output shaft side of each motor is the reverse direction). Spacing s between the tips of the piercing grindstone 1 and 2, drives the motor 4 and 5 feed while applying a torque limit to the advancing direction of the drilling grinding wheel 1, the feed motor 4 and 5 when worked torque limiter By adding together the rotational speeds, the rotational speed of the feed motor can be measured and set in the stroke setting means.

Claims (3)

A pair of drilling wheels arranged on the same axis with their tips opposed to each other, and an advancing / retreating device for moving these drilling wheels back and forth in the axial direction, and moving the pair of drilling wheels around the axis while moving forward and backward In a drilling device for a hard brittle plate that drills a through hole in a hard brittle plate positioned between the pair of drilling wheels,
By making the pair of drilling wheels advance toward the hard brittle plate simultaneously or alternately, bottomed holes are formed on both surfaces of the hard brittle plate, and the depth of the bottomed holes is increased simultaneously or alternately. By making the both bottomed holes communicate with each other at the intermediate thickness portion of the hard brittle plate, a through hole is drilled in the hard brittle plate.   The drilling device for a hard brittle plate according to claim 1, wherein the pair of drilling grindstones are pivotally supported by a pair of grindstone tables that simultaneously advance in the axial direction toward each other.   The hard brittle plate perforating apparatus according to claim 1, wherein the pair of perforating grindstones are pivotally supported on a reciprocating table that reciprocates while sequentially increasing a reciprocating distance.

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