JPH0529614U - Flat diamond drill and seamer attached to the drill - Google Patents

Abstract

(57) [Abstract] [Objective] An improvement of a flat diamond drill for drilling holes in a glass plate, and a seamer capable of detachable drilling and chamfering in the same step. [Structure] A pair of left and right cutting blades provided with parallel finishing blades fixed to the right and left side portions of a core metal, and corners that extend from the tip of the core metal by extending the finishing blades and narrowing them in a tapered shape. When,
In a flat diamond drill provided with a water supply hole for supplying cooling water to the shaft core, a bottom sloped surface is formed obliquely upward toward the counter-rotational direction surface with the bottom surface of the tip of the corner as a boundary of the in-plane center line of the core metal. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a diamond impregnate type drill, and more particularly to a drill for drilling a glass plate which is a hard and brittle material, and a shimmer for chamfering simultaneously with the drilling.

[0002]

[Prior Art]

 As a tool for perforating a glass plate which is a hard and brittle material, for example, Japanese Utility Model Publication No. 51-27510 has a reamer having abrasive particles fixed to the surface thereof, which is attached to the upper part of a plate-shaped drill which is made smaller toward the tip. Although a drill for plate glass has been disclosed and various proposals have been made as a core drill, for example, Japanese Utility Model Laid-Open No. 63-166361 discloses a plurality of arc-shaped chips containing diamond abrasive grains at the tip of a cylindrical shank. A diamond core drill in which one or both of the lateral end surfaces of the tip is tilted by 30 ° or more is disclosed, and as a tool for simultaneously performing straight drilling and chamfering to tilt the end of the hole in the core drill, For example, in Japanese Utility Model Laid-Open No. 60-183157, a blade portion is provided at the tip of a shank connected to a drive source such as a motor. In the core drill provided with the formed head, the head has a drill portion for perforating a brittle body such as plate glass and a seamer portion for chamfering the periphery of the hole perforated by the drill portion simultaneously with the perforation. In addition, as an improvement of the core drill with a seamer, Japanese Utility Model Laid-Open No. 63-127875 discloses a diamond seamer in which a diamond grindstone body having a chamfered inclined surface is provided with a tightening tool that closely adheres to the main body diamond core drill. Has been done. Furthermore, in the structure described in Japanese Patent Laid-Open No. 161280/1993, which takes into consideration the occurrence of chipping that occurs at the entrance of the hole and the occurrence of corner chipping when the hole is removed, the pipe-shaped tool shank sandwiches the center of rotation of the tool. A pair of plate-shaped taper main cutting edges extending in the longitudinal direction through the gap are formed to face each other, and the main cutting edges taper toward the tip, and the tip is concentric trapezoidal arc surface. A tool for forming a hole in a hard and brittle material in which a hole is formed is disclosed.

[0003]

[Problems to be solved by the device]

 In the plate glass drill disclosed in Japanese Utility Model Publication No. 51-27510, the drilling part and the grinding finishing part are integrated, but the drilling conditions of the drill and the reamer are different, and the equipment for changing the rotation speed, that is, the complicated equipment. The diamond core drill disclosed in Japanese Utility Model Application Laid-Open No. 63-166361 has a plurality of arc-shaped tips containing abrasive grains at intervals at the tip of a cylinder, and has a drawback that it requires a structure. Attempts have been made to provide a gap in the pressure contact to facilitate the injection of cooling water and prevent defects such as chipping, but the glass core that remains in the cylinder when the hole is penetrated remains in the cylinder and is taken out. However, there is a drawback in that the two-way method in which holes are drilled from the top and bottom is used, and the one disclosed in Japanese Utility Model Laid-Open No. 60-183157 has a drill part and a blade part. As the body structure, one side is chamfered at the same time as drilling, but similar to the above, measures to take out the glass core blockage are taken, and the drill part and the blade part are almost in pressure contact with the surface to be drilled as described above, and insufficient injection of cooling water to diffuse. Since the number of rotations is reduced in order to prevent the defects generated from the above, the drilling efficiency is low, and in the case of Japanese Utility Model Laid-Open No. 63-127875, there is a concern that the tightening screw may loosen during chamfering. There is a defect that the chamfered chamfered finish has a defect, and, as described above, the contact pressure structure reduces the cutting speed, resulting in slow tact and reduced productivity.

In Japanese Patent Laid-Open No. 3-161280, the main cutting edge and the abrasive grain layers of the first and second cutting edge surfaces are made to have different abrasive grain diameters to achieve high efficiency and reduce chipping and chipping. However, similarly to the above, it is difficult to take out a core clogging of, for example, about 1.5 mmφ in the perforation, and there is a problem in using it in the working process of continuous perforation.

[0005]

[Means for solving problems]

 The present invention has been made in view of the above problems, and it is extremely easy to take out the core clogging at the time of punching after completion of drilling, and a seamer for chamfering at the same time as drilling is detachable. At the same time, as a drill that can be chamfered, parallel finishing blades that are fixed to the left and right sides with the shank as an axis on a plate-shaped cored bar that is connected to the shank, and the finishing blades are extended to reach the tip. A pair of left and right cutting blades provided with corners narrowed in a taper shape and protruding from the tip of the core metal, and a concave notch formed at the tip of the core metal to communicate the bottom surface of the notch and the shank. In a flat diamond drill including a water supply hole for drilling, a bottom inclined surface is formed obliquely upward from the tip bottom surface of the corner toward the counter-rotation direction surface with the in-plane center line of the core metal as a boundary. Structure at the corner Forming a side slope extending outward toward the counter-rotational direction plane with the inner side surface of the concave section as a boundary, or forming the bottom slope and the side slope at the corner. In addition to these, a chamfer having an upward slope is provided on the upper side surface of the finishing blade section, and a slit-shaped groove section is further provided on the side surface of the cutting blade section and / or the finishing blade section. (EN) A flat diamond drill in which a U-shaped or V-shaped edging portion that opens outward is provided on a side portion of the finishing blade portion.

Further, a hole for inserting the shank in the center of an oval base metal having a thickness, a screw hole for inserting a set screw orthogonal to the hole on the side surface of the base metal, and a surface of the base metal Connected to a notched sphere band-shaped grinding portion that stands up along opposing arcs of a semicircle and whose tip narrows toward the center of the arc, and notched sphere belt edge edges of the opposing grinding portions that sandwich the hole. Also provided is a seamer which is mounted on a flat diamond drill, which comprises a pair of wall portions projecting from the tip thereof to insert and sandwich the shank side end edge of the core metal.

[0007]

[Action]

 The flat diamond drill of the present invention (hereinafter referred to as FD drill) can be drilled from one direction, and it is also possible to cut the interlayer film of the laminated glass by a pair of facing corners to drill the hole. The bottom surface and the inner side surface of the section are provided with a bottom slope and a side slope that are different from each other with the center line in the core metal as the boundary, and chips are discharged or generated during drilling and inside the corner after penetration. The contact support area to the glass core that stays in the side surface is reduced, the clogging phenomenon of the core is eliminated by the cooling water sprayed from the water supply hole provided in the notch, and the chamfered part provided above the finishing blade makes it straight. Piercing and chamfering slopes are performed with the same drill, and cooling water is more reliably supplied to the inner surface of the corners, cutting edges, and finishing edges by water supply holes and grooves, and with an FD drill with edging. Machine set with eccentricity function Chamfered piercing the glass plate upper and lower surfaces by so can be carried out in the same step.

Even if the seamer can be attached to and detached from the FD drill exclusively for drilling, the compressive force generated in the hole to be ground is small because the grinding surface of the pressure contact portion is narrow and does not cause misalignment or rotational slipping, and cooling is possible. Excellent water penetration and defect-free perforation.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of an FD drill according to an embodiment of the present invention, FIG. 2 is a front view of an assembly in which a seamer is attached to an FD drill, FIG. 3 is a bottom view of FIG. 2, and FIGS. 6 and 7 are perspective views of another FD drill according to an embodiment of the present invention, FIG. 8 is an exploded perspective view of the seamer shown in FIG. 2, and FIG. 9 is the use of the FD drill shown in FIG. It is sectional drawing explaining a state.

Finishing in which the polishing abrasive grains of diamond are fixed in parallel to the left and right sides of a cored bar 2 made of, for example, a stainless steel plate and continuously provided at the tip of the spindle shank 1, with the shank 1 as an axis. A two-blade structure comprising a blade portion 3 and a cutting blade portion 5 which is extended to the finishing blade portion and narrows in a taper shape toward the tip and which has a corner portion 4 protruding from the tip of the core metal 2, and a core metal An FD drill 8 including a water supply hole 7 penetrating from the bottom surface of a notch 6 having a concave end portion 2 to the end of the shank 1 along the axis is shown in FIG. As described above, one of the corners 4 and 4 that comes into contact with the surface of the glass plate 10, which is the anti-rotation side of the bottom surface of the tip, faces the anti-rotation side surface of the arrow with the center line in the front and rear surfaces of the core metal 2 as a boundary. Forming a bottom slope 11 obliquely upward, that is, having an angle of θ, Even the corners 4 on the rotating side of countercurrent Ru provided bottom slope 11 formed on arbitrarily differences and bottom slope.

Instead of the bottom slope 11, as shown in FIG. 3, the inner side faces formed by the corners 4 and 4 with the in-plane center line of the core metal 2 as a boundary are directed outward toward the counter rotation side face of the arrow. That is, if the side slope 12 having an angle of α is formed and the side slope 12 is formed also at the corner 4 at the opposed position by mistake, the FD drill 8 dedicated for straight drilling is formed, and the side slopes 12 and 12 are formed. There may be combined corners 4 and 4 provided with bottom slopes 11 and 11.

The FD drill 9 of FIG. 4 provided on the upper side surface of the finishing blade portion 3 of the FD drill and provided with the chamfered portion 13 that is inclined and expanded upward is an FD drill 9 having a corner portion 4 and a relatively large bore diameter, or It can be provided in any of the small diameter exclusive use as shown in 6, and the drill is one in which the drilling and chamfering are integrated. Further, as shown in FIG. 7, a U-shaped or V-shaped edging portion 14 that opens toward the outside is provided on the side surface of the hanging finishing blade portion 3, and straight piercing and chamfering of inclined surfaces at both end edges of the hole are provided. It becomes the FD drill 19 to perform.

Further, as shown in FIG. 5 and FIG. 6, a slit-shaped groove portion 15 is provided until the side surface of the cutting edge portion 5 or the side surface of the finishing blade portion 3 is provided so as to satisfactorily inject the cooling water, As shown in FIG. 9, when the side surfaces of the cutting blade portion 5 and the finishing blade portion 3 narrowed in a tapered shape are rounded with a radius R of about 1.5 to 2.5 times the bore diameter, a rounding occurs. There is little abrupt change in resistance, and the thickness of the finishing blade 3 and the cutting blade 5 is preferably in the range of 35 ° to 70 ° shown in Fig. 3 from the viewpoint of drilling efficiency and its life. The contact area is small, and as a result, the drilling speed becomes slow, and if it is increased, problems such as core clogging as in the past occur, and the grain size of diamond depends on the cutting edge part 5 from the drilling speed and the surface finish of the drilled surface. # 80 to # 100, the finishing blade section 3 is in the range of # 170 to # 230. To use things.

The FD drill 8 dedicated to drilling without the chamfered portion 13 and the edging portion 14 is equipped with a detachable seamer 16 to chamfer a straight hole and the hole edge. The seamer has an oval shape. In order to secure the shank 1 and the seamer 16 to be inserted into the hole 18 by making a hole 18 for fitting the shank 1 in a base metal 17 made of, for example, stainless steel having a thickness of A screw hole 21 into which the set screw 20 is orthogonally communicated with the hole portion 18 is provided on the side surface of the base metal 17, and is provided upright along the arcs of the semicircles facing each other on the base metal surface, and its tip is located at the center of the arc. A ball zone is formed by notching a hollow ball that narrows toward the opposite side, and a grinding section 22 for fixing diamond abrasive grains # 200 to # 230 is provided on the surface of the zone. The hole 18 is sandwiched by the gold and the grinding part 22 There is provided a pair of wall portions 23 which are connected to the end portions of the spherical zone and project from the tip end surface thereof to insert and sandwich the end edge of the cored bar 2 on the shank 1 side. The total angle of the circumferential angles of the grinding portions 22 disposed on the left and right sides is in the range of 100 ° to 140 °.

The operation of the present invention will be described below. The shank 1 is attached to a rotation drive unit (not shown), and cooling water is directly sprayed from the water supply hole 7 onto the perforated portion of the glass plate 10 to be perforated and pressed, and the FD drill 8 being perforated is rotated by pressing and rotating the glass plate. The cooling water is sprayed from the water supply hole 7 provided on the bottom surface of the cutout portion 6 of the core metal to collide with the glass plate 10, and a part of the cooling water that diffuses is on the inner surface of the corner portion 4, and the other is the other cooling water. The FD drill 8 which is composed of two blades and flows into the outer surface of the cutting blade portion 5 or the finishing blade portion 3 through the groove portion 15 etc. together with water is sufficient before and after the rotating pressure grinding portion. Cooling water flows in to wash and cool the grinding surface, or to cool the drilled groove by adding water to the pressure contact surface to ensure lubrication, and also to constantly press the glass plate 10 surface during drilling. However, the pressing surface consisting of two blades is at two points on the circumference. Since it is repeated by rotation, the action difference between the three-dimensional bending and the two-dimensional bending of the squeezing bend compared to the conventional full-edge pressing, the rotation number and the pressing force from the acting force and the action of the cooling water, that is, the machining There are no defects such as chipping even when drilling without reducing the speed, and the grain size of the diamond abrasive grains of the cutting edge 5 and the finishing edge 3 is divided to give a fine finish of the finish roughness of the hole surface and the chamfered part. As a result, both speed and finish are improved compared to conventional drilling.

The glass core generated in the inner surface of the corner portion 4 during drilling improves the discharge of chips by providing the bottom sloped surface 11 and the side sloped surface 12 at the corner portion, and further, the inner surface and the core side surface. The contact area with the core is reduced, and the collision of the cooling water sprayed from the supply hole 7 and diffused in the notch 6 and the weight of the core synergistically cause the glass plate 10 to naturally drop when it penetrates through the hole and continuously. It does not hinder the drilling process. Since there is no temperature rise during grinding by the pair of corners 4 and the injection of cooling water as described above, not only single glass but also laminated glass with an interlayer film of polyvinyl butyral inserted can be drilled and the temperature rise The finished state of the cut surface of the film for prevention is extremely good.

If the side slopes 12 and 12 and the bottom slopes 11 and 11 are formed in the direction of rotation, the discharge of chips is poor and the life of the corners 4 and 4 is shortened. The chamfered portion 13 provided in the FD drill 9 can perform drilling and chamfering of the upper surface thereof in the same drill. If the chamfered portion 13 having two pieces is provided with the groove portion 15, injection of cooling water is improved, and burnt and burnt. Prevents defects such as chipped corners.

Further, if the FD drill 19 provided with the edging portion 14 is mounted on a machine having an eccentric function and drilled, chamfering of the upper and lower edges of a straight hole can be performed by the same drill in the same step.

Next, an example and a comparative example of the seamer 16 which is detachably attached to the FD drill 8 dedicated to drilling will be described. Example 1. Hole diameter x number of processed pieces ... 26.5 mmφ x 500 pieces on glass plate 2. Cima: dimension 36 mmφ, circumferential angle of grinding part (total) 140 ° Diamond grain size of grinding part # 200 3. Cooling water: Water injection hole 3 Kg / cm ² injection, also given from outside the seamer. 4. Chamfering time: 0.5 to 1.0 seconds / sheet 5. Rotational speed (no load) × cutting speed ... 4,900 rpm × 40 mm / min The results were all good with no defects such as crack chipping.

Comparative Example Under the same conditions as in Example except for the seamer having a grinding portion provided in the range of 360 °, the result was 20 defective pieces such as cracks and chippings. The chamfering is performed from the perforation of the cutting blade part 5 to the post-finishing grinding part 22 of the inner surface of the perforation of the finishing blade part 3. The FD drill 8 and the seamer 16 are attached by inserting the shank 1 and the hole part 18 and screwing. In addition to fixing the set screw 20 to the hole 21 by tightening, the core metal 2 portion of the drill is inserted between the wall portions 23, 23, so that the rotational force applied to the shank 1 does not slip and the seamer 16 is surely provided. And the FD drill 8 and the shimmer 16 rotate concentrically with each other, and the action is to reliably supply the cooling water before and after the pressure contact portion of the rotating two-flute grinding portion 22 to cause the seamer 16 to move to the FD drill 8 Chamfering without defects can be performed under the same conditions as the pressing force and rotation speed of the FD drill, the FD drill 8 and the seamer 16 can be easily replaced due to the life difference, and the combination of diamond abrasive grains according to the drilling conditions is also easy. To Kill.

[0021]

[Effect of the device]

 According to the present invention, by providing a bottom slope or a side slope at the corner portion composed of two blades and the injection force of the cooling water sprayed from the supply hole, the glass core naturally discharges when the hole penetrates. The double blade reduces the pressing force at the peripheral edge of the hole and facilitates the diffusion of cooling water. In addition, the groove is provided to prevent the temperature from rising due to cooling water, and the effect of lubricity causes defects such as burns and chips. Can be drilled without holes, and chamfering and edging can be provided on the drill for drilling to allow chamfering on one side or both sides. The effect of the drill and shimmer of different types can be easily replaced, and the straight hole and chamfering can be done in the same process.

[Brief description of drawings]

FIG. 1 shows a perspective view of an FD drill according to an embodiment of the present invention.

FIG. 2 is an assembled front view in which a seamer is attached to an FD drill.

3 shows a bottom view of FIG.

FIG. 4 is a perspective view of another FD drill according to an embodiment of the present invention.

FIG. 5 is a perspective view of another FD drill according to an embodiment of the present invention.

FIG. 6 is a perspective view of another FD drill according to an embodiment of the present invention.

FIG. 7 is a perspective view of another FD drill according to an embodiment of the present invention.

FIG. 8 is an exploded perspective view of the seamer shown in FIG. 2 disassembled.

9 is a cross-sectional view illustrating a usage state of the FD drill shown in FIG. 7.

[Explanation of symbols]

2 ... Core metal 3 ... Finishing blade 4
・ ・ ・ Corner 5 ・ ・ ・ Cut blades 8, 9, 19 ・ ・ ・ FD drill 11 ・ ・ ・ Bottom slope 12 ・ ・ ・ Side slope 1
3 ... Chamfer 14 ... Border 15 ... Groove 1
6 ... Cima 17 ... Base metal 22 ... Grinding part 2
3 ... Wall

Claims (7)

[Scope of utility model registration request] 1. A parallel finishing blade portion fixed to left and right side portions with the shank as an axis on a plate-shaped cored bar continuous with the shank, and the finishing blade portion is extended and tapered toward the tip. A pair of left and right cutting blades each having a corner portion that is narrowed to protrude from the tip of the core metal, and a concave cutout portion is formed at the tip end of the core metal, and a hole is provided to connect the bottom surface of the cutout portion and the shank. A flat diamond drill having a water supply hole, wherein a bottom bottom surface of the corner portion forms a bottom slope inclined upward toward the counter-rotation direction surface with the in-plane center line of the core metal as a boundary. 2. A parallel finishing blade portion fixed to left and right side portions with the shank serving as an axis on a plate-shaped cored bar continuous with the shank, and the finishing blade portion extending and tapering toward the tip. A pair of left and right cutting blades each having a corner portion that is narrowed to protrude from the tip of the core metal, and a concave cutout portion is formed at the tip end of the core metal, and a hole is provided to connect the bottom surface of the cutout portion and the shank. In the flat diamond drill consisting of the water supply holes, a flat diamond forming a side slope extending outward toward the counter-rotational direction surface with the inner surface of the recess formed by the corners as a boundary of the in-plane center line of the core metal. Drill. 3. The flat diamond drill according to claim 1, wherein the bottom slope and the side slope are formed at the corners. 4. The flat diamond drill according to claim 1, wherein a chamfered portion having an upward slope is provided on an upper side surface of the finishing blade portion. 5. The flat diamond drill according to claim 1, wherein slit-shaped groove portions are provided on the side surfaces of the cutting blade portion and / or the finishing blade portion. 6. A U-shaped or V-shaped edging portion that opens outwardly is provided on a side portion of the finishing blade portion.
Alternatively, the flat diamond drill described in 2 or 3. 7. A hole in which the shank is fitted in the center of an oval base metal having a thickness, a screw hole on a side surface of the base metal that is orthogonal to the hole and into which a set screw is screwed, and a surface of the base metal. Connected to a notched spherical band-shaped grinding portion that stands up along an arc of a semicircle facing each other and has its tip narrowed toward the center of the arc, and a notched spherical band end edge of the grinding part that opposes the hole portion. And a seamer mounted on a flat diamond drill, which comprises a pair of wall portions projecting from the tip and inserting and sandwiching the shank side edge of the core metal.