JP2013040056A - Glass drill - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a glass drill that can effectively prevent minute cracks from occurring due to a lack of cooling in a drill tip section by smoothly and sufficiently supplying a cutting liquid to the drill tip section when a glass plate is subjected to hole-forming processing and that can conduct the hole-forming processing with high accuracy.SOLUTION: The cutting liquid L is supplied smoothly and sufficiently to the drill tip section by forming a liquid-supplying groove 11 on the outer surface of the glass drill, wherein the liquid-supplying groove is formed such that it inclines backward in a rotating direction toward a drill tip direction, thereby conducting the hole-forming processing with high accuracy while effectively preventing the minute cracks from occurring due to the lack of cooling in the drill tip section.

Description

  The present invention relates to a glass drill for subjecting a glass plate to a predetermined drilling process.

  Glass substrates used in flat panel displays such as plasma displays and liquid crystal displays are provided with through holes (exhaust holes) in the corners and peripheral edges of the glass substrate for the purpose of exhausting the panel and enclosing gas. It is done.

  Glass materials have hard and brittle properties as their material characteristics. Therefore, when drilling holes in glass substrates, heat treatment required after drilling due to insufficient cooling of the drill tip by cutting fluid. Small cracks may occur during the process.

  In particular, when processing a small-diameter through hole in a thin glass substrate, the shortage of the cutting fluid supplied to the drill tip is prominent due to the small diameter of the drill used for processing. There has been a problem that the glass substrate is damaged or broken due to minute cracks generated on the inner peripheral surface or the periphery thereof.

  In order to cope with such a problem, Patent Document 1 discloses that a plurality of notch portions having different sizes are provided on the outer peripheral surface of the cutting portion of the cutting tool that performs drilling, and the cutting tool supplies a workpiece to be cut. When cutting, the cutting tool is forced to swing using the difference in the magnitude of contact resistance generated at each notch, and the cutting fluid is supplied from the gap between the cutting tool and the work piece caused by the swing. Techniques for performing are disclosed.

  In Patent Document 2, a groove for discharging chips is formed on the outer peripheral surface of a cutting portion of a cutting tool that performs drilling, and at the time of drilling, the grooves are used to replace chip discharge. Further, a technique is disclosed in which a cutting fluid is supplied to the bottom of a machining hole so that the groove serves as both a chip discharge groove and a cutting fluid supply groove.

JP 2004-291185 A JP 2002-137112 A

  However, the technique disclosed in Patent Document 1 has a problem that forced cutting is given to the cutting tool at the time of drilling, and the processing accuracy of the hole processing surface is lowered by the vibration of the tool.

  In addition, as described in the same document, if the cutting tool only vibrates, a force that can positively supply the cutting fluid to the cutting portion tip side of the tool is not generated. There is also a problem that it is difficult to spread the liquid.

  Moreover, even if it is based on the technique disclosed by patent document 2, the groove | channel used for supply of the cutting fluid and the groove | channel used for discharge | emission of a chip are the same, Comprising: It is an operation | work contrary to discharge | emission and supply. Must be done by a single groove.

  And since the single groove | channel disclosed by the same literature mainly aims at discharge | emission of a chip, not only the force which can supply cutting fluid positively to a drill front end does not generate | occur | produce. On the contrary, there is a problem that a force for drawing out the cutting fluid can be generated, and it becomes difficult or impossible to supply a sufficient amount of the cutting fluid to the drill tip.

  An object of the present invention is to supply a cutting fluid smoothly and sufficiently to a drill tip so that generation of micro cracks due to insufficient cooling of the drill tip can be effectively suppressed, and highly accurate drilling can be performed. It is to provide a glass drill.

  In order to solve the above-mentioned problems, the present invention provides a glass drill for subjecting a glass plate to a predetermined drilling process. A cutting fluid is applied to an outer surface of the glass drill at a tip portion of the glass drill. A liquid supply groove to be supplied is formed, and the liquid supply groove is characterized by being inclined backward in the rotational direction toward the distal end direction of the glass drill.

  According to such a configuration, since the liquid supply groove is inclined rearward in the rotation direction toward the tip of the drill, the drill is pushed into the cutting fluid flowing through the liquid supply groove toward the tip of the drill when the drill rotates. Directional force acts. As a result, a smooth and sufficient supply of cutting fluid to the drill tip can be performed, so that generation of microcracks due to insufficient cooling of the drill tip can be effectively suppressed, and highly accurate drilling can be performed. Become.

  In the above configuration, a discharge groove for discharging chips from the tip of the glass drill is formed on the outer surface of the glass drill, and the discharge groove rotates toward the tip of the glass drill. It is preferable to incline forward in the direction.

  In this way, since the liquid supply groove and the discharge groove are formed as grooves dedicated to liquid supply and discharge, respectively, the supply of the cutting fluid to the drill tip and the chips from the drill tip Both actions can be performed at the same time with distinction from the discharge. Moreover, since the discharge groove is inclined forward in the rotational direction toward the tip of the drill, when the drill rotates, a force in the direction away from the tip of the drill acts on the chips flowing along with the cutting fluid in the discharge groove. To do. As a result, it becomes possible to positively discharge the chips, so that it is difficult for chips to stay between the drill tip and the hole processing surface of the glass plate. The problem of rough skin on the surface can be suppressed as much as possible.

  Said structure WHEREIN: It is preferable that the outer surface of the said drill for glass is formed with a cylindrical surface part and the convex curve part connected to the front end side.

  If it does in this way, it will become possible to drill a through-hole rapidly in a glass plate, suppressing increase in cutting resistance.

  In the above configuration, the liquid supply groove may be formed to be curved when viewed from the front.

  Even in this case, it is possible to enjoy the same operational effects as those already described.

  Said structure WHEREIN: It is preferable that a curvature radius becomes large as the said liquid supply groove | channel moves to a front-end | tip direction.

  In this way, the action of the force that pushes the cutting fluid flowing through the supply groove into the drill tip is greater at the upstream end of the supply groove than at the downstream end. It becomes possible to supply cutting fluid.

  In the above configuration, the discharge groove may be formed to be curved when viewed from the front.

  Even in this case, it is possible to enjoy the same operational effects as those already described.

  Said structure WHEREIN: It is preferable that a curvature radius becomes small as the said discharge groove | channel moves to a front-end | tip direction.

  In this way, the upstream end of the discharge groove has a greater force to move away the chips flowing along with the cutting fluid from the drill tip than the downstream end, so that the cutting from the drill tip can be performed more smoothly. It becomes possible to discharge the powder.

  Said structure WHEREIN: It is preferable that the said liquid supply groove | channel is formed on the extended line which goes to the center axis line of the convex-curved surface part from the said cylindrical surface part.

  If it does in this way, the cutting fluid supplied through a liquid supply groove will be able to spread to a drill front-end | tip part without deviation, and it becomes possible to raise cutting efficiency effectively.

  Said structure WHEREIN: It is preferable that the depth of the liquid supply groove | channel formed in the said convex-curved surface part is deep compared with the depth of the liquid supply groove | channel formed in the said cylindrical surface part.

  In this way, the cutting fluid supplied through the liquid supply groove is supplied to the drill tip without a shortage, and the cooling effect of the drill tip is enhanced. Can be suppressed. In addition, even when the wear of the convex curved surface portion proceeds due to the pressing to the glass plate, it takes a long time until the liquid supply groove becomes shallow enough to withstand use, so that the durability can be improved. .

  As described above, according to the glass drill of the present invention, the generation of micro cracks due to insufficient cooling of the drill tip can be effectively suppressed by smoothly and sufficiently supplying the cutting fluid to the drill tip. Can be drilled with high accuracy.

It is a front view which shows the use condition of the glass drill which concerns on 1st Embodiment of this invention. It is the schematic diagram which expand | deployed the drill for glass shown in FIG. 1 in the cylindrical surface part. FIG. 3A is a front view showing a glass drill according to a second embodiment of the present invention, FIG. 3B is a bottom view thereof, and FIG. 3C is a rear view thereof. FIG. 4A is a front view of a glass drill according to a third embodiment of the present invention, and FIG. 4B is a bottom view thereof. FIG. 5A is a front view of a glass drill according to a fourth embodiment of the present invention, and FIG. 5B is a bottom view thereof.

  Embodiments of a glass drill according to the present invention will be described below with reference to the accompanying drawings. In the following embodiments, the glass plate is a glass substrate for a flat panel display such as a liquid crystal display or a plasma display.

  First, the structure of the glass drill 1 (henceforth the drill 1) which concerns on 1st Embodiment of this invention is demonstrated based on FIG. The outer surface of the drill 1 is formed by a cylindrical surface portion 1a on the base end side and a convex curved surface portion 1b smoothly connected to the distal end side. In this embodiment, the convex curved surface portion 1b is formed in a hemispherical shape. For example, diamond abrasive grains are attached to each of the cylindrical surface portion 1a and the convex curved surface portion 1b using a binding material such as a metal bond.

  On the outer surface of the drill 1, a supply groove 11 that supplies the cutting fluid L to the distal end side from the cylindrical surface portion 1 a to the convex curved surface portion 1 b, and a discharge groove 12 that discharges the chips K to the proximal end side Is formed. The liquid supply groove 11 is inclined rearward in the rotational direction toward the distal end direction of the drill 1, while the discharge groove 12 is inclined forward in the rotational direction toward the distal end direction of the drill 1. The shape of the liquid supply groove 11 is formed so as to be linear when the liquid supply groove 11 is viewed from the front, and the shape of the discharge groove 12 is also when the discharge groove 12 is viewed from the front. Are formed so as to be linear.

  Further, in order to prevent a through path of the cutting fluid L flowing through the liquid supply groove 11 to the discharge groove 12 (the cutting fluid L flowing through the liquid supply groove 11 leaks into the discharge groove 12 before reaching the drill tip). The liquid supply groove 11 and the discharge groove 12 are preferably formed at positions that are appropriately separated from each other in the cylindrical surface portion 1a of the drill 1 without being close to each other.

  The cross-sectional shape of the liquid supply groove 11 and the discharge groove 12 (the shape of the cross section perpendicular to the flow path of the cutting fluid L and the chips K) may be circular or rectangular, and the groove depth is 5 to 30 of the drill diameter. % Is preferable.

  FIG. 2 is a schematic view of the developed drill 1 shown in FIG. 1 (specifically, a developed view of the cylindrical surface portion 1a on the outer surface of the drill 1). In the developed view shown in FIG. 2, the inclination angle with respect to the center line (a straight line parallel to the axis) of the liquid supply groove 11 and the discharge groove 12 is preferably in the range of 1 ° to 45 °.

  Next, based on FIG. 1, the drilling process and action effect to the glass plate 2 using the drill 1 are demonstrated.

  When the drill 1 rotates in the direction A (clockwise) shown in FIG. 1 and contacts the glass plate 2, the cutting fluid L supplied from a cutting fluid supply source (not shown) such as a nozzle is supplied to the liquid supply groove 11. By tilting backward in the rotational direction toward the distal end direction of the drill 1, a force is applied in the direction of a in FIG. 1 (direction to push into the drill distal end portion) in the liquid supply groove 11, and the drill distal end portion Supplied to. Further, the chip K generated in the processing moves away from the tip of the drill in the direction of b in FIG. 1 in the discharge groove 12 because the discharge groove 12 is inclined forward in the rotational direction toward the tip direction of the drill 1. Direction) and discharged from the drill tip together with the cutting fluid L. Here, as the cutting fluid L, cutting oil, water, or the like can be used.

  Moreover, by forming the tip portion of the drill 1 into a curved surface that is convexly curved toward the drill tip direction, it is possible to quickly drill a through hole while suppressing an increase in cutting resistance.

  3A to 3C show a glass drill 1 according to a second embodiment of the present invention. As described in the first embodiment, the liquid supply groove 11 and the discharge groove 12 formed on the outer surface of the drill 1 are inclined backward in the rotational direction and forward in the rotational direction, respectively, toward the distal end direction of the cutting drill 1. Then, the function of supplying the cutting fluid L and the function of discharging the chips K can be exhibited. In the present embodiment, it is not a linear shape as shown in FIGS. 1 and 2, but is formed to be curved when the liquid supply groove 11 is viewed from the front, and the shape of the discharge groove 12 is also The discharge groove 12 is formed to be curved when viewed from the front. The liquid supply groove 11 has a larger radius of curvature as it moves in the distal direction, and the discharge groove 12 has a smaller radius of curvature as it moves in the distal direction. Since other configurations are the same as those in the first embodiment, a duplicate description is omitted.

  In the present embodiment, the downstream end of the liquid supply groove 11 is formed on the central axis of the convex curved surface portion 1b. If it does in this way, in addition to the effect similar to 1st Embodiment mentioned above, the cutting fluid L supplied to a drill front-end | tip part can be reliably supplied to the deepest part of a processing hole.

  4 (a) and 4 (b) show a glass drill 1 according to a third embodiment of the present invention. In the present embodiment, the groove depth in the convex curved surface portion 1b of the liquid supply groove 11 for supplying the cutting fluid L to the drill tip is deeper than the groove depth in the cylindrical surface portion 1a of the drill 1, Specifically, the liquid supply groove 11 formed in the entire region of the convex curved surface portion 1b or in one region of the tip is the slit S.

  As shown in FIG. 4B, the slit S (the liquid supply groove 11 in the convex curved surface portion 1b) passes on the central axis of the convex curved surface portion 1b of the drill 1 as its path, and FIG. As shown in a), the downstream end of the slit S (the downstream end in the supply direction of the cutting fluid L) and the upstream end of the discharge groove 12 (the upstream end in the discharge direction of the chips K) are the cylindrical surface portion 1a and the convex curved surface portion 1b. Are provided at the same height at the boundary. Other configurations are the same as those in the first and second embodiments described above, and thus redundant description is omitted.

  By providing such a slit S in the liquid supply groove 11, the cutting fluid L supplied through the liquid supply groove 11 is supplied to the distal end portion of the drill 1 (mainly the distal end portion of the convex curved surface portion 1 b) without shortage. Thus, since the cooling effect of the tip of the drill 1 is enhanced, the generation of micro cracks due to the influence of heat can be further suppressed. In addition, even when wear of the convex curved surface portion 1b progresses due to the pressing to the glass plate 2, it takes a long time until the liquid supply groove 11 becomes shallow enough to withstand use, so that the durability is improved. Is planned.

  FIGS. 5A and 5B show a glass drill 1 according to a fourth embodiment of the present invention. The drill 1 according to the fourth embodiment is also provided with a slit S as in the third embodiment, but unlike the third embodiment, the downstream end of the liquid supply groove 11 and the upstream end of the discharge groove 12 Are provided at the same height in the middle of the convex curved surface portion 1b in the axial direction. Other configurations are the same as those in the first, second, and third embodiments described above, and thus redundant description is omitted.

  In the first to fourth embodiments according to the present invention, the shape of the convex curved surface portion 1b of the drill 1 is a hemispherical surface. However, the shape is not limited to this, and other curved surface shapes that are curved in a convex shape, for example, The tapered cross-sectional contour line may be formed in an elliptical shape or the cross-sectional contour line may be formed in a parabolic shape.

  In addition, the present invention is not limited to the case where the liquid supply groove 11 and the discharge groove 12 are completely independent as in each of the embodiments described above, but the downstream end of the liquid supply groove 11 and the upstream end of the discharge groove 12 Including the case where is communicated.

  In each of the drawings for explaining the embodiment of the present invention described above, the same reference numerals are given to the constituent elements having the same function or shape, and the duplicate description is omitted.

  As described above, according to the glass drill of the present invention, the generation of micro cracks due to insufficient cooling of the drill tip can be effectively suppressed by smoothly and sufficiently supplying the cutting fluid to the drill tip. Can be drilled with high accuracy.

DESCRIPTION OF SYMBOLS 1 Glass drill 2 Glass plate 11 Supply groove 12 Discharge groove A Glass drill rotation direction 1a Glass drill cylindrical surface portion 1b Glass drill convex curved surface portion L Cutting fluid K Chip a Supply direction (Supply of cutting fluid L direction)
b Discharge direction (Chip K discharge direction)
S slit

Claims (9)

In a glass drill that performs predetermined drilling on a glass plate,
On the outer surface of the glass drill, a liquid supply groove for supplying a cutting fluid to the tip of the glass drill is formed,
The said liquid supply groove | channel inclines in the rotation direction back toward the front-end | tip direction of the said glass drill, The glass drill characterized by the above-mentioned. On the outer surface of the glass drill, a discharge groove for discharging chips from the tip of the glass drill is formed,
2. The glass drill according to claim 1, wherein the discharge groove is inclined forward in the rotational direction toward a tip direction of the glass drill.   3. The glass drill according to claim 1, wherein an outer surface of the glass drill is formed of a cylindrical surface portion and a convex curved surface portion connected to a tip end side thereof.   The said liquid supply groove | channel is curving when it sees from the front, The drill for glass in any one of Claims 1-3 characterized by the above-mentioned.   5. The glass drill according to claim 4, wherein the liquid supply groove has a radius of curvature that increases as it moves in a distal direction.   The glass drill according to claim 1, wherein the discharge groove is curved when viewed from the front.   The glass drill according to claim 6, wherein the discharge groove has a radius of curvature that decreases as it moves in a distal direction.   The said liquid supply groove | channel is formed on the extended line which goes to the center axis line of the said convex-curved surface part from the said cylindrical surface part, The drill for glass in any one of Claims 3-7 characterized by the above-mentioned.   The glass drill according to claim 3, wherein a depth of the liquid supply groove formed in the convex curved surface portion is deeper than a depth of the liquid supply groove formed in the cylindrical surface portion.

Images