JPH0976228A - Method and apparatus for perforating brittle material plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for perforating a brittle material plate which makes it possible to reduce a cutout generated at the drill punching side and to improve the perforating efficiency when the plate is perforated by using a core drill. SOLUTION: The method for perforating at a brittle material plate S by a drill 3 while supplying working fluid comprises the step of giving the pressure of pressurized fluid 24 from the rear surface side to the part to be perforated of the material S.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing method for punching a brittle material plate such as a glass plate, and an apparatus therefor.

[0002]

2. Description of the Related Art Generally, when drilling a brittle material plate such as a glass plate or a ceramic plate, for example, when a mounting hole for a wiper or a power window is formed in an automobile window glass, a rotating core drill is used. Press a cutting tool such as the above against the glass plate and perform drilling while supplying the processing liquid to the processing part.

At this time, as shown in FIG. 4, the brittle material plate S
(A) of the core drill 3 rotating from one side of
When the brittle material plate is punched by pressing in the order of (b) and (c), the unprocessed part is brittlely broken by the pressing of the core drill immediately before the drill tip reaches the back surface of the brittle material plate, and the drill is brittle. Penetrating the material plate to form a core 4
The unprocessed portion 20 in the thickness direction of the brittle material plate when the material falls off
Since they fall off together with the core, a large chip 21 is formed around the hole-processed portion of the brittle material plate, which deteriorates the strength and aesthetics thereof.

Therefore, a first drilling process is carried out from one surface side of the brittle material plate by using a core drill or the like to halfway through the thickness of the brittle material plate, and thereafter, the other surface of the brittle material plate is coaxial with the core drill. A two-way process for forming a through hole in the brittle material plate by performing a drilling operation from the side to form a through hole on the both surfaces with less occurrence of chipping is performed.

Further, as shown in FIG. 5, a one-way processing from one side of the brittle material plate is also attempted in which a core drill 3 having a tapered tip is pressed in the order of (a), (b) and (c) in the figure to punch. Has been.

[0006]

When the above two-way punching method is performed, it is difficult to surely position the hole formed by the first punching step and the hole formed by the second punching step coaxially with each other. For this reason, a step is formed on the hole processing wall surface due to the axial deviation between the first and second drilling steps, and the strength and aesthetics of the brittle material plate are deteriorated.

Further, when a core drill having a tapered tip as shown in FIG. 5 is used, since the tapered portion of the drill is machined so as to expand the hole after the shell is removed, the chip generated on the work plate is reduced. can do. But,
Before the core (falling shell) fell out, as shown by the arrow in the figure, the machining fluid 22 supplied from the shaft hole of the core drill passed through the inside from the tip of the core drill to the tapered portion on the outside of the core drill. When removed, as shown in FIG. 5C, the machining liquid blows through the hole, so that the machining point 23 between the drill taper portion and the workpiece is processed.
Since the machining liquid does not spread, the drill taper portion is apt to burn, so that the machining speed cannot be increased, and the dressing must be frequently performed.

An object of the present invention is to provide a drilling method and an apparatus therefor, which can reduce chipping that occurs on the drill exit side when drilling a brittle material plate by using a core drill or the like and improve processing efficiency. To provide.

[0009]

According to the present invention, in a working method for making a hole in a brittle material plate with a drill while supplying a working liquid, a pressure of a pressurized fluid is applied to a portion to be worked of the brittle material plate from the back surface side. It is a method for making a hole in a brittle material plate, which is characterized in that

In the present invention, the pressure of the pressurized fluid is applied to the processed portion of the brittle material plate from the back surface side, and a liquid or gas can be used as this fluid. A liquid is preferable because it is easy to pressurize and the amount of pressurized fluid that blows through the drill is small and safety is high. When a liquid is used as the pressurized fluid, it often mixes with the working fluid, so it is preferable to use a liquid of the same material as the working fluid as the pressurized fluid, usually water or a water-soluble grinding fluid. To be done.

The pressure of the pressurized fluid is preferably generated by providing a liquid tank so that its opening is in close contact with the back surface of the processed portion of the brittle material plate and supplying the pressurized liquid into the liquid tank. be able to.

The pressure of the pressurized fluid in the present invention is adjusted depending on the type of drill and whether or not the pre-drilling process is performed on the brittle material plate. If the pressure of the pressurized fluid is too low,
It is impossible to prevent the occurrence of chipping, and if the pressure is too high, the brittle material plate that is the work piece may not be able to withstand the pressure and may be damaged, so normally 0.2 to 5 kgf / cm ² Kept within the range of. A more preferable range is 0.5 to 3 kgf /
cm ² .

When a cylindrical core drill having a flat tip is used as a drill to supply liquid to the shaft hole, the pressurizing fluid must counter the force due to the pressing force of the drill and the pressure of the working liquid to supply the shaft hole. It is preferable to have a pressure capable of generating. However, when the drill penetrates the brittle material plate, in order to prevent the pressurized fluid having a pressure higher than that of the working fluid from flowing backward to the drill shaft hole and damaging the shaft hole feed pump, It is necessary to take measures such as stopping the pressurization of the pressurized fluid.

When a pressurized working fluid is supplied to the inside of the cylinder of the drill (so-called axial bore feed fluid), the above-mentioned working fluid is used as the pressurized fluid and is supplied from the axial bore feed fluid system. This is preferable because it simplifies the apparatus, and at this time, the pressure of the pressurized fluid becomes equal to the pressure of the working fluid.

When using a core drill of the axial hole liquid supply type in which the outer shape of the tip of the drill has a taper shape, a pressurized fluid is used so that the machining liquid can be continuously supplied to the tapered portion of the drill. As described above, it is preferable to use the same liquid as the above-described working liquid supplied from the shaft hole liquid supply system and having the same pressure.

According to the present invention, when a brittle material plate is drilled using a core drill or another drill, the brittle material plate is pressed by the drill and when the working fluid is supplied to the drill through the axial hole. The force in the drill feed direction is received by the pressure of the working fluid, but the force is offset by applying pressure from the back surface of the workpiece, that is, the opposite side of the drill, by the working fluid.

Further, when a drill having a tapered tip capable of supplying the axial hole liquid is used, the processing liquid is stored in a liquid tank on the back surface of the brittle material plate, and the same amount as the processing liquid for supplying the axial hole of the drill is used. In addition to the above, when the brittle material plate is processed and the shell is removed, the working fluid does not blow through, and the working fluid remains on the drill taper surface and the surface to be worked as before. Supplied in between.

[0018]

Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the glass plate S is held on the support base 7. A cylindrical tank 1 serving as a machining liquid reservoir is provided on the lower surface of the position where the drilling of the glass plate S is performed by the drill 3, and an opening 8 is provided on the upper portion of the tank 1 and the periphery of the opening. An O-ring 2 made of rubber seals between the glass plate S and the back surface 9 of the processed portion. A pressurized working liquid, which is a pressurized fluid 24, is introduced into the tank through the guide hole 13 provided on the side wall of the tank 1. In consideration of the treatment of shells and chips generated during drilling, the tank 1 is detachably attached to the support base with a hinge 10 and a clasp 11 in a space below the glass plate S, When the shells 4 etc. are stored in the tank, they can be easily taken out from the tank and discarded.

The glass plate S is not directly supported by the tank 1 or the O-ring 2, but is supported by the support table 7 of the work table, and the clearance between the tank 1 and the glass plate S is set so that the collapse amount of the O-ring 2 is appropriate. Is set to. Although the tank 1 is provided independently in this embodiment, the tank may be provided in the work table itself of the processing machine that holds the glass plate to provide the function. Also, the tank itself or the O-ring may directly support the plate to be processed such as a glass plate so that the tank itself or the O-ring may also serve as the support base. The drill is provided with a shaft hole 5 for allowing the working fluid to pass therethrough. Water or other working fluid pressurized by a pump (not shown) and a conduit (not shown) is drilled as shown by an arrow. 3 and is passed through the inside of the cylindrical blade 12 of the drill 3
And between the surface to be processed.

First, the case where a flat tip type core drill is used will be described. As shown in FIG. 2, a core drill 3 having a flat tip and an outer diameter of 10 mm and an inner diameter of 7 mm is used, and the core drill 3 is pressed against a glass plate S having a thickness of 5 mm in the order of (a), (b) and (c) in the figure. Make a hole. The processing liquid, water,
It is pressurized to 1 kgf / cm ² with a pump (not shown) and supplied to the shaft hole 5 of the core drill through a conduit (not shown). The back surface of the glass plate S and the periphery of the opening of the machining fluid tank 1 having a diameter of 16 mm are sealed with an O-ring 2, and the machining fluid tank 1 has the same value as the shaft hole water supply pressure from the pump to the core drill of 1 kgf /
Water pressurized to cm ² is introduced through the guide hole 13. Filled in the machining fluid tank 1 working fluid is in contact with the back surface of the glass plate S, approximately multiplied by the working fluid pressure 1 kgf / cm ² of the area of about 2 cm ² of the opening of the machining fluid tank 1 2 kgf External force acts on the glass plate S as if pressing it from the back surface.

The drill was drilled at a feed rate of 50 mm / min and a rotation speed of 6000 rpm. As a result, the thickness of the unprocessed portion near the back surface of the glass plate, that is, the thickness of the shell (t2) was 0.68 mm, which was about 85% of the thickness (t1) of 0.80 mm of the shell without pressure. . The diameter (d2) of the shell in this example is 11.
12 mm, this value and the diameter of the hole drilled 10.00
The difference with mm is 1.12 mm, and as a comparative example, the diameter (d1) 1 of the shell without the pressure applied by the machining fluid tank.
The difference between 1.60 mm and the diameter of the bored hole of 10.00 mm was about 70% of 1.60 mm. As described above, it can be seen that the chip around the hole of the plate to be processed is smaller in this example than in the comparative example.

In this embodiment, the pressure applied to the rear surface of the glass plate is 1 kgf / cm, which is the same as the pressure value of the water supplied to the core hole.
Although there was a ^2, the pressure of the working fluid to be applied to the tank 1 is higher becomes thin thickness of empty shells, the diameter d2 is smaller, i.e. tend to chipping of the peripheral holes is reduced. In addition, the diameter of the opening of the tank in this example is 1 outside diameter of the core drill.
Although it was 16 mm compared to 0 mm, it is effective to apply a small diameter as close as possible to the outer diameter of the core drill, for example, 12 mm, to effectively apply pressure to the plate to be processed, and to reduce chipping around the plate hole to be processed. .

Next, the case of using a tapered core drill will be described. As shown in FIGS. 1 and 3, the taper tip angle is 60 degrees, the tip outer diameter is 8 mm, and the root outer diameter is 10 m.
Using a core drill 3 having an inner diameter of 7 mm and an inner diameter of 7 mm, a glass plate S having a thickness of 5 mm is drilled. As a result of making other processing conditions the same as the above-mentioned example, the thickness of the unprocessed part of the glass plate was the same as that of the above-mentioned example.

By supplying the working fluid to the tank 1 at the same pressure as the axial hole water supply pressure of the core drill 3, the working fluid is sufficiently supplied to the working portion even after the shell 4 is removed from the glass plate S. It is possible to prevent clogging and burning of the tapered portion of No. 3.

In this embodiment, similarly to the above-mentioned embodiments, the feed rate of the core drill to the axial hole and the pressure of the working fluid applied to the tank are set to 1 kgf / cm ^2. As a result, the feed rate of the workable drill is set to 130%. I was able to. In addition, the clogging of the tapered portion of the core drill has been reduced, and in the conventional case, for example, about 2
In the present invention, the dressing, which was required every 0 times of machining, was required about every 45 times of machining, and the dressing interval could be doubled or more.

The supply pressure of the working liquid to the tank 1 in this case is
It is best to make the pressure the same as the pressure of the axial hole water supply of the core drill, but if the glass plate and the tank are sufficiently sealed, it is possible to obtain some effect by simply storing the working fluid in the tank.

In the conventional machining method, as shown in FIG. 5, when the core drill 3 having a tapered tip is used, after the shell 4 is removed, the machining liquid is blown out from the hole, so that the tapered portion of the core drill 3 is machined. The liquid will not spread,
It is easy to cause clogging and burning of the part.

In the present embodiment, an example of drilling a brittle material plate in which a pre-process such as a pilot hole has not been carried out is shown, but a sufficient effect is obtained even when a pre-work such as a pilot hole is carried out. Further, in the above-mentioned two embodiments, the core drill having the axial hole was used as the drill by supplying water to the axial hole. However, it is also applicable to the core drill which supplies water from the outside without supplying the axial hole and the solid drill having no axial hole. Can be applied.

[0029]

When a general core drill with a flat tip is used, the glass is pushed in the axial direction of the drill by the force in the feed direction by the core drill and when the core drill is supplied with the axial hole, the glass is pressed in the axial direction of the drill. When processing progresses and the unprocessed part of the workpiece becomes thin and cannot withstand the force, the core, that is, the shell, comes off and chipping occurs. It is known that the chip generated at this time is almost proportional to the thickness of the unprocessed part of the core.

In the machining method of the present invention, since a pressure is applied by the machining liquid from the back surface of the workpiece, that is, the side opposite to the surface processed by the core drill, the force acts in the direction opposite to the feed direction of the core drill. The force of pressing the brittle material plate, which is the workpiece, is offset. As a result, the unsealed portion of the shell becomes thinner and the chipping near the hole becomes smaller because the timing of the core slipping out is delayed.

Further, when a drill having a tapered tip capable of supplying the axial hole liquid is used, the processing liquid is stored in a liquid tank on the back surface of the brittle material plate, and the same amount as the processing liquid for supplying the axial hole of the drill is used. In addition to the above effects, the following effects can be obtained by applying the pressure. In the conventional machining method, the machining fluid 6 supplied from the axial hole 5 of the drill 3 and discharged to the surface of the workpiece through the machining site as shown by an arrow in FIG. When the shell was removed and the shell disappeared, it was blown through the hole to the back surface of the workpiece and was no longer supplied to the processing location. In this processing method, however, the blow-through of the machining liquid 6 was the workpiece as shown in FIG. Since it is blocked by the pressurized liquid in the processing liquid tank 1 on the back side and the same pressure as the shaft hole supply liquid is applied, there is no delay when the shell comes off, and there is sufficient delay in the processing location between the drill and the workpiece. A working fluid can be supplied.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional processing method.

FIG. 5 is a sectional view showing another conventional processing method.

FIG. 6 is an enlarged sectional view showing a conventional processing method.

[Explanation of symbols]

S glass plate, 1 liquid tank, 2 O-rings, 3 drills,
4 shells, 5 shaft holes, 6 working fluid, 7 support, 8
Opening, 9 backside of processed part, 10 hinge, 11 clasp,
12 blades, 13 guide holes, 20 unprocessed parts, 21 chips,
22 working fluid, 23 working location, 24 pressurized fluid,

Claims (6)

[Claims] 1. A method of forming a hole in a brittle material plate with a drill while supplying a working liquid, wherein a pressure of a pressurized fluid is applied to a portion to be processed of the brittle material plate from the back surface side. Drilling method for material plate. 2. The pressure of the pressurized fluid is generated by supplying a pressurized liquid into the liquid tank by providing the liquid tank so that its opening is in close contact with the back surface of the processed portion of the brittle material plate. The method for boring a brittle material plate according to claim 1, wherein 3. The brittle material plate according to claim 1, wherein the drill has a cylindrical shape, a working fluid is supplied into the cylinder of the drill, and the same fluid as the working fluid is used as the pressurized fluid. Drilling method. 4. The pressurized fluid is supplied at the same pressure as the working liquid supplied to the inside of the cylinder of the drill.
A method for punching a brittle material plate as described. 5. The method of boring a brittle material plate according to claim 3, wherein the outer shape of the tip of the drill has a tapered shape. 6. A drill, a support for holding a brittle material plate, a working liquid supply means for supplying a working liquid to a working portion, and a liquid tank for accumulating the working liquid having an opening. A means for maintaining the liquid tank so that the opening of the liquid tank can be brought into close contact with the back surface of the portion to be processed of the brittle material plate supported on the support table; An apparatus for punching a brittle material plate, comprising: a means for supplying a liquid.