JPH0753941Y2 - Punching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a device for punching a glass plate which is a brittle material.

[Prior art and its problems]

When a glass plate is drilled, defects such as chipping are likely to occur on the drill contact surface of the hole and the peripheral edge on the back surface side.

As a countermeasure against these problems, it has been proposed that the cutting edge of the core drill is tapered, as disclosed in Japanese Utility Model Laid-Open No. Sho 48-23386, but it is not a fundamental suppression of chipping.

That is, the attached FIG. 4 is a side sectional view showing a state in which a brittle plate material, for example, a glass plate 2 is being drilled by the tapered core drill 1, and the upper surface side of the glass plate 2 is Y, Y due to the pressing force x of the core drill 1. A strong compressive force indicated by ′ is generated, and they are pressed against each other, which is a major factor of causing a chip in the portion.

Further, when the core drill penetrates the glass plate 2, the lower surface side is likely to be chipped due to the impact due to the release of the pressing force, the rapid restoration of the glass plate 2, and the like.

In addition, the actual feed flat 1-60814 is equipped with a repeat feed mechanism for the diamond core drill to change the repeat feed cycle and pressing force according to the cutting depth.
No. 57 discloses that the core drill head is composed of a drill portion and a seamer portion for chamfering around the hole.

In the former case, the machining efficiency is inferior, and the control system is complicated due to repeated feeding, which causes a cost increase.

In the latter case, the chip abutment surface side of the core drill can be cut and removed by seaming, but the chipping remains on the facing surface side.

It should be noted that as another measure for suppressing the chipping, it is considered to make the grinding powder finer as much as possible, but it is not practical because it lowers the cutting efficiency.

The present invention solves these problems and provides a punching device in which chipping is suppressed as much as possible by simple means.

[Means for solving problems]

The present invention is a drilling device comprising a driving rotary core drill and a bending moment load means having a drill head contact surface side of a glass plate to be drilled as a tension side, wherein the bending moment load means is a glass plate drill contact. A ring-shaped support tool through which a drill can be placed on the back side, and a drill shaft and a ring-shaped support tool on the drill contact surface side that are substantially concentric with each other and have an inner diameter larger than the outer diameter of the ring-shaped support tool. A drilling device comprising a ring-shaped pressing tool and a means for controlling the pressing of the ring-shaped pressing tool against a glass plate, and a head in a rotary drive core drill has a tapered tapered tip blade portion and a cylindrical trailing blade portion. And a grain size of the abrasive grains planted on the outer periphery of each of them is 100 mesh or more at the tip blade portion and 200 mesh or less at the trailing blade portion.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side sectional view according to the present invention, in which 2 is a glass plate which is a brittle plate, 1 is a drill which is driven to rotate, for example, a tapered core drill. Reference numeral 3 is a bending moment load means for applying a tensile force to the upper surface of the glass plate 2 against the compressive strain generated by the pressing force of the core drill 1 on the upper drill contact surface of the glass plate 2. For example, a resin which contacts the lower surface side and is inserted after the core drill 1 penetrates the glass plate 2,
Ring-shaped support 4 made of hard rubber, and glass plate 2
Of the core drill 1 and the ring-shaped pressing member 5 arranged substantially concentrically with the ring-shaped supporting member 4 and having an inner diameter larger than the outer diameter of the ring-shaped supporting member 4. The pressing member 5 is made of stainless steel. It is formed of a metal 5a such as steel and a resin or rubber 5b in the glass plate contact portion.

FIG. 2 is an overall perspective view according to the present invention. The ring-shaped pressing tool 5 is supported by a support rod 6 on a support body (not shown) so as to be vertically rotatable, and an air cylinder 7 supported separately by the support body is driven. The ring-shaped pressing member 5 is pressed downward by the extension action of the shaft body 7 ′.

Reference numeral 8 denotes a cooling water introducing hose, and cooling water is also introduced from an air core 9 of the core drill, and cools the contact portion between the core drill 1 and the glass plate 2 with the cooling water.

It should be noted that the ring-shaped support tool 4 may have a protruding height of several mm to several tens of mm.

Further, by providing a supporting member having a substantially similar height and an appropriate shape at another position of the glass plate 2 corresponding to the supporting member 4, the support is made stable and reliable.

Further, the ring-shaped support tool 4 can be detachably provided on the punching table 3 '. Further, by making the inner diameter of the ring-shaped support tool 4 smaller than the diameter of the drill 1, it is possible to eliminate the impact when the drill 1 penetrates the glass plate 2, and accordingly,
The chipping is further suppressed.

Then, when the cutting edge of the core drill 1 is brought into contact with the glass plate 2 and perforated, the compressive strain of the glass plate 2 caused thereby is applied to the ring-shaped pressing tool 5 based on the drive of the air cylinder 7.
Then, the glass plate 2 is pressed against the glass plate 2 for cutting, and during that time, cooling water flows out from the hollow portion 9 of the hose 8 and the core drill 1 to cool these cutting portions. By performing such an operation, it is possible to greatly suppress the occurrence of a noticeable chipping of the perforated portion in many cases in the conventional means.

FIG. 3 is a front view of a core drill head according to the present invention, which comprises a tapered taper portion 10 and a succeeding cylinder portion 11 connected to the taper portion 10. The taper portion 10 and the cylinder portion 11 are made of a binder such as a low melting point metal. Abrasive grains, usually diamond grains, are planted on the outer periphery.

In the present invention, the abrasive powder size of the taper portion 10 of the head is 100 mesh (150 μm) or more as in the conventional case, for example 80 mesh (175 μm), and the abrasive grain size of the cylinder portion 11 of the head is 200 mesh (70 μm) or less, for example 270 With a mesh (50 μm), the tapered portion 10 has a function of expanding holes and holes, and the cylinder portion 11 has a function of smoothing holes.
Therefore, even if a chip occurs, it can be effectively suppressed by such a configuration.

It should be noted that the diameter of the cylinder portion 11 is equal to or larger than the diameter of the thickest root portion of the taper portion 10, and is preferably slightly thicker.

According to the punching device of the present invention, however, the conventional chipping of a radius of 1.5 mm or more can be suppressed to 0.4 mm or less, which is hardly visible.

[Effect of device]

According to the present invention, it is possible to easily suppress the breakage of the brittle glass plate with a simple means.

[Brief description of drawings]

1 is a partial side sectional view of the present invention, FIG. 2 is an overall perspective view,
FIG. 3 is a front view of a core drill head according to the present invention, and FIG. 4 is a partial side sectional view according to a comparative example. 1 ... Core drill, 2 ... Punched plate 4 ... Supporting tool, 5 ... Pressing tool

Claims (2)

[Scope of utility model registration request] 1. A drilling device comprising a driving rotary core drill and bending moment load means having a drill head contact surface side of a glass plate to be drilled as a pulling side, wherein the bending moment load means is a glass plate drill contact. A ring-shaped support tool which can be penetrated by a drill and which is arranged on the contact / rear surface side and a drill shaft and a ring-shaped support tool which are substantially concentric with the drill contact surface side, and whose inner diameter is larger than the outer diameter of the ring-shaped support tool. A ring-shaped pressing tool of
A punching device comprising means for controlling the pressing of the ring-shaped pressing tool against a glass plate. 2. A head in a rotary drive core drill comprises:
The tapered tapered tip blade and the cylinder-shaped trailing blade are integrated, and the grain size of the abrasive grains planted on the outer periphery of each is 100 mesh or more at the tip blade and 200 mesh or less at the trailing blade. The punching device according to claim 1, wherein