JP2836663B2 - Method of forming a hole by digging and flat diamond drill used therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat diamond drill for making polygonal, elliptical or deformed holes in a glass plate of a hard brittle material, for example, a window glass for a vehicle, a building, a door glass of a vehicle, and the like.

[0002]

2. Description of the Related Art Various types of drills have been proposed as tools for making holes in architectural glass doors or vehicle window glass. For example, Japanese Patent Publication No. 55-34
No. 5 discloses a method for cutting a glass plate. When a cutout hole having a polygonal contour is formed in a glass plate with or without an opening at a side edge of the plate, one side of the cutout hole is formed. Cutting of the other side leaving at least, using a cylindrical rotary cutting tool having a glass cutting action surface on the side surface, starting from the side edge of the glass plate or a hole previously drilled in the glass plate, the rotation center of the tool It describes that the tool is cut out while being rotated at a high speed in a posture in which the axis is substantially perpendicular to the surface of the glass plate, and is advanced along a predetermined contour.

Further, Japanese Patent Application No. Hei.
No. 229760 proposes to use a flat diamond seamer drill 13 as shown in FIG. 4 to first drill a hole by rotation, and then to drill a deformed hole by grinding and feeding the edging portion 14 by NC control.

[0004]

[Problems to be solved by the invention] Japanese Patent Publication No. 55-345
In the method for cutting a glass plate described in the publication, the other side of one side of the cutout hole is cut out while rotating a cylindrical rotary cutting tool having a cutting action surface at a high speed with the drilled hole as a starting point, scheduled. Cutting along the contour and cutting the remaining side with a conventional glass cutter with a cutter mark and cutting and separating by impact, it is difficult to work and it is not easy to obtain uniform quality drilling. There was a problem.

In the case of the flat diamond seamer drill described in Japanese Patent Application No. Hei 4-229760, the position of the edge is provided in a notch on the finishing edge of the drill body having a large outer diameter. Using for example
When cutting a small acute angle portion that can be formed at the inner corner when a triangle is formed, double drilling is necessary, such as replacing the drill separately and proceeding, or moving the glass plate to be drilled to a machine with a small diameter drill There was a problem that required.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a drill suitable for a small-sized hole formed in a window glass, a door glass, or the like for a building or a vehicle. For the purpose of providing, a finishing blade portion which is fixed to the left and right side portions of the metal core with a shank continuously provided on a plate-shaped metal core as an axis, and the finishing blade portion is extended and tapered toward the tip. A cutting edge portion narrowing in a shape,
Flat die consisting of a gouging blade part provided at a location
Using an diamond drill, cut the cutting edge and
After drilling a circular pilot hole with the finishing blade, rotate the gouging blade
While making contact with the inner peripheral surface of the circular pilot hole,
Start milling and move so as to draw the locus of the specified hole shape
To form a predetermined hole shape by grinding
A method of forming a hole by gouging for chamfering,
Dowels used in the method of forming holes by gouging as described above
Ril, a shank connected to a plate-shaped core
And fixed to the left and right sides of the cored bar, and the rotation axis of the drill
The finishing blade with the corner parallel to the blade and the finishing blade
Extends and narrows in a tapered shape toward the tip,
A cutting blade part having a corner protruding from the tip as a blade part;
A two-blade structure consisting of a hollow cutting blade at the lower end of the blade
In a flat diamond drill,
Small-diameter cylindrical and ground at the place connected to the shank
Provide a gouge blade part whose surface is concave in a concave shape, or
A notched edging edge is provided above the finishing edge.
The above-mentioned flat diamond drill (hereinafter referred to as FD drill) is provided.

[0007] A deformed hole is a triangle, square,.
And diamond-shaped polygonal shapes, elliptical shapes, and combinations of the ellipses in a cross shape.

[0008]

In the present invention, a circular pilot hole is formed between the cutting blade portion and the finishing blade portion which rotate around the shank . Under circular if the acrid Ri blade portion to the edge periphery of the lower hole Seshimere move FD drill with the rotation of abutting the shank along a predetermined cut-out plan outline
Drilling of a unique shape such as a triangle having an area larger than the hole is also possible . Deformed hole tangent to the circular pilot hole
In the form of triangular, it can be reduced grinding of them if harshness Ri blade portion so as allowed to move drill <br/> contact with the line of triangle side and a circular hole as a grinding start point, as a result harshness Ri becomes survival of the blade portion, and harsh Ri blade portion of the cross section is concave in a circular arc shape
As a result, the chamfered shape of the modified hole can be selected, and the chamfering can be performed simultaneously with the formation of the modified hole . In addition, a small hole formed inside the corner of a modified hole such as a triangle
For grinding sharp corners, connect the mandrel with the upper shank.
Due to the small diameter of the gouging blade provided at the location,
The corner of the hole can be easily reduced to a small radius.
You.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an overall perspective view of the FD drill of the present invention, and FIG. 2 shows a pilot hole formed in a glass plate and a hollow of the FD drill.
Ri shows a perspective view cutaway of a part showing a relation between the blade portion, FIG 3 is a perspective view of the FD drill showing another embodiment of the present invention,
FIG. 4 is an overall perspective view of the flat diamond seamer drill proposed by the present applicant.

[0010] the glass plate 1 brought drilled circular lower hole 11, it is used to finish the profiled bore 12, such as a triangle F
D drill 2 is approximately the same diameter or slightly oversized outer diameter side surface cutting forms a concave, have a harsh Ri blade section 4 provided with the diamond abrasive grains to the external shape surface, and the shank below the shank 3
I do. Right and left side portions of the core 5 consisting of continuously provided to, for example, stainless steel plate to該抉Ri blade portion, the drill times by fixing abrasive grains of diamond shank 3 as axial
A finishing blade portion 6 having a corner portion parallel to the axis of rotation as a blade portion, and a hollow blade formed of a corner portion extending from the finishing blade portion and narrowing in a tapered shape toward the lower end and projecting from the front end of the metal core 5. A cutting blade portion 8 having a two-blade configuration provided with the portions 7 and 7 is provided . A water supply hole 10 is provided that penetrates from the bottom surface of the notch 9 formed in the lower concave portion of the cored bar 5 to the upper end of the shank 3 along the axis.

The grain size of the diamond abrasive grains is as follows: # 60 to # 120 for the cutting blade 8 and # 140 to # 2 for the finishing blade 6.
70, it is possible to use a blade portion 4 that Ri acrid ranging # 60 # 600, the particle degree of the rotational speed FD drill 2, the cut feed rate, variously selected in consideration of conditions such as the moving speed .

Hereinafter, the operation of the present invention will be described. An outer diameter of approximately 35φ finishing cutting portion 6, by mounting the FD drill 2 the outer diameter of the harshness Ri blade portion 4 is made of 10φ a rotating portion of a machine tool, not shown, through the shank 3, the water supply of drilling the shank 3 When the cooling water is injected from the hole 10 and the FD drill 2 is pressed against the glass plate 1 and rotated while directly spraying the cooling water also on the portion of the glass plate 1 to be drilled, the cooling water from the water supply hole 10 is A part of the cooling water that is sprayed from a water supply hole 10 provided on the bottom surface of the notch 9 of the metal core and collides with the surface of the glass plate 1 and diffuses is formed at the corner 7.
The cooling water that is sprayed directly on the inner surface of the
By flowing into the outer surface of the cutting blade 8 or the finishing blade 6 together with the downward drilling of the D drill 2, the FD drill 2 composed of two blades provides sufficient cooling water to be supplied to the inside and outside of the corner 7. in cleaning the cooling of the grinding surface, or holding the lubricant and subsequently direct cooling water cutting blade portion 8 and finishing edges 6, further supplies to the blade section 4 of Ri harshness, the cooling during the grinding, cleaning, lubrication Do it.

The rotation speed of the FD drill 2 is 8,000 rpm
m, descending grinding feed speed 150mm / min, prepared hole 11
Was bored, After finishing the cutting portion 6 penetrates the lower hole, the inner peripheral surface of the prepared hole 11 while rotating the blade section 4 of Ri egress of FD drill by the NC controller (not shown) as shown in FIG. 2 equivalents By contacting them and moving them so as to draw an equilateral triangular locus at a transverse grinding feed speed of 20 mm / min while maintaining a rotation of about 8,000 rpm, an equilateral triangular shaped hole 12 is formed.

The resulting modified hole 12 was an equilateral triangle having a side of about 45 mm and a corner having a radius of R5 (about 5 mm radius), and the hole could form an inner peripheral surface which had been chamfered. Triangular profiled hole 12 consisting of a tangent drawn to the circular lower hole 11, acrid Ri grinding amount of the blade 4 is reduced, thus extending the該抉Ri blade portion of the grinding life, especially lower hole 11 and the triangular
Near the contact point between the shape of the line can be achieved an increase in grinding speed, it can be variously selected by the concave shape of the selection of the cutting portion 4 which Ri acrid also finished shape of the profiled bore inner surface.

Further, the blade portion 4, 4 Ri acrid 3 '
Were arranged in multiple stages, # the abrasive particle size used in the first stage of the harshness Ri blade portion 4 # 60 # 325,2 stage harshness Ri blade portion 4 '2
If the high-speed processing is performed in the first step and the finishing processing is performed in the second step, the high-quality deformed hole 12 can be formed more quickly.

When drilling a modified hole 12 larger than a triangle formed by a circular tangent to the pilot hole 11 , drilling a straight portion of the modified hole using the edging blade portion 14 and digging Ri blade portion 4,
The drilling of the acute angle portion of the modified hole using 4 'may be appropriately combined. Thus, it is natural that the concave surfaces of the blade portions are made to coincide with each other.

During the drilling, the glass core generated in the inner surface of the corner 7 has a unique inclined surface provided by the present applicant in Japanese Utility Model Application No. 3-78511. As a result, the discharge of chips is improved, and the area of contact with and supporting the inner side surface of the core and the side surface of the core is reduced. Due to the synergistic effect of its own weight, the glass sheet 1 falls naturally when the glass plate 1 is pierced, and does not hinder the continuous piercing process. The above-mentioned cooling water injection causes no temperature rise during grinding, so that it is possible not only to form a single sheet glass but also to form a deformed hole in a laminated glass into which an intermediate film of, for example, polyvinyl butyral is inserted, thereby preventing the temperature from rising. The finished state of the cut surface is extremely good.

[0018] FD corner portions 7 of the lower tip of the drill 2, i.e. notch 9 into parting-shaped cutting edge portion having a shape which is not provided, by providing the cutting portion 4 which Ri harsh and continuously to the shank 3, Although the processing time of the pilot hole 11 increases, it is possible to form the modified hole 12.

[0019]

[Effect of the Invention The present invention is an FD drill provided with acrid Ri blade portion of substantially the same diameter as the shank between shank and the core, with a cutting edge portion and a finishing blade portion for rotating the shank an axis was drilled pilot holes in a glass plate, it is possible to specific drilling when allowed to move a blade portion Ri harsh on the edge periphery of the lower hole circle along the cutout plan contour with the rotation of abutting the shank, under the grinding amount if moving the FD drill hole as a contact also achieved the survival of less harshness Ri blade portion, etc. perform chamfering various shapes by the shape of harshness Ri blade unit at the same time, the effect is very remarkable.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an FD drill according to an embodiment of the present invention.

FIG. 2 is a perspective view of a part of a notch showing a relationship between a pilot hole formed in a glass plate and a notch of an FD drill.

FIG. 3 shows a perspective view of an FD drill showing another embodiment of the present invention.

FIG. 4 shows an overall perspective view of a flat diamond seamer drill already proposed by the present applicant.

[Explanation of symbols]

2 ······ FD drill 3 ...... shank 4, 4 '... harsh Ri blade section 5 ...... core metal 6 ...... finishing the blade section 8 ... .... Cutting blades

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 49-128853 (JP, U) JP-A 4-28955 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B24D 7/18 B23B 51/00 B23B 51/08 B28D 1/14

Claims (3)

(57) [Claims] 1. A finishing blade portion fixed to the left and right sides of a metal core with a shank connected to a plate-shaped metal core as a shaft core, and the finishing blade portion is extended and tapered toward the tip. The cutting edge portion narrows to the point where the core bar and the shank are connected.
Flat diamond drill consisting of provided gouge blade
The workpiece has a circular cutting edge and finishing edge
After drilling the pilot hole, rotate the gouge
Abut on the inner peripheral surface of the
Move to draw the locus of the hole shape of
Forming by grinding and chamfering the inner surface of the hole
Forming a hole by gouging. 2. A hole is formed by the gouge according to claim 1.
Drill that is used for
Adheres to the left and right sides of the cored bar with the provided shank as the axis
Finish with a sharp edge parallel to the axis of rotation of the drill
The blade and the finishing blade are extended and
The corner that protrudes from the tip of the cored bar
Cutting edge portion, and hollow cutting of the lower end of the cutting edge portion
Flat diamond drill with two blades consisting of a blade
At the connecting point between the cored bar and the shank.
Gouge blade with a cylindrical shape and concave grinding surface
Flat diamond drill
Le. 3. An edge provided in a notch shape on an upper portion of the finishing blade portion.
3. The flap according to claim 2, further comprising a cutting blade.
Diamond drill.