JP2012111165A - Boring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply an abrasive without changing structure of a boring device, when a boring speed gets low, in an internal dust collection type boring method for carrying out air cooling of a core bit cutting edge part and discharge of chips by outside air sucked into a core bit, when boring a material to be bored using the boring device equipped with the core bit.SOLUTION: A bottle-like container 22 is once grasped, when the boring speed gets low, to supply the abrasive from a core bit outside toward a boring groove, using a pump tool 21 comprising the flexible resin bottle-like container 22, and a straw-like nozzle 24, and capable of delivering the abrasive in the container from the nozzle 24, when grasping once the container 22.

Description

  The present invention relates to a method for drilling a work material such as concrete by a dry method using a core bit.

  In the method of drilling into a work material such as concrete with a core bit, a wet type one in which cooling of the cutting edge portion made of a chip formed of diamond abrasive grains at the tip of the core bit at the time of drilling and discharge of chips are performed with cooling water. There is a dry type that uses air, and even if it is a dry type, a compressor is connected to the swivel joint of the hollow shaft via a hose, and the core bit is fitted, and the work material is covered with the perforated groove. A dust collector is connected to the suction pad that is installed by a hose, and the blade tip is cooled by passing compressed air supplied from the compressor through the air pipe, swivel joint and hollow shaft into the core bit inside and outside the core bit. After the chips in the perforation groove are ejected into the suction pad, they are removed by suction with a dust collector via a hose. Part dust collection method (Patent Document 1) and a dust collector connected to the swivel joint of the hollow shaft via a hose, sucking the air inside the core bit and passing outside air outside the core bit through the perforated groove and sucking it into the core bit In this way, the cutting edge portion is cooled and the chips are discharged, and the dust and air consisting of the chips in the core bit are sucked out by the dust collector via the hollow shaft, swivel joint and hose (Patent Document 2). )

  In the dry type drilling method, the cutting edge portion may be burned out due to heat generated during drilling, which may cause breakage during drilling. In order to solve this problem and maintain the sharpness at the time of drilling, the abrasive is supplied into the drilling groove to promote the dressing action of the blade edge part. The abrasive supply method is from the start to the end of drilling. There are one that supplies the abrasive continuously, and one that supplies the abrasive intermittently. Patent Document 1 discloses a method of supplying an abrasive material with a timer for a certain period of time.

JP-A-5-104522 JP 2003-19710 A

  The external dust collection system described above requires a compressor that supplies compressed air into the core bit, a suction pad, a dust collector that sucks dust together with the air, and a piping facility for them. The dust collector sucks outside air into the core bit. Compared to the internal dust collection system that sucks and discharges together with dust, the structure is complicated, and when an abrasive supply device is incorporated, the structure is further complicated.

  An object of the present invention is to provide an efficient drilling method in which the structure for supplying an abrasive is simple and without changing the structure in the internal dust collection method described above.

  The invention according to claim 1 includes a core bit having a cutting edge at the tip, a hollow shaft to which the core bit is detachably attached, and rotationally driven by a driving device, and a swivel joint provided on the hollow shaft via a hose. A drilling device having a dust collector connected thereto, and drilling the work material by passing outside air outside the core bit through the perforation groove by the dust collector and sucking the core bit into the cutting edge of the core bit In the drilling method, which cools the dust and sucks and removes dust generated during drilling through the hollow shaft, swivel joint, and hose together with the outside air, a pump device that supplies abrasive material to the drilling site by manual operation is used. Outside of the core bit in the drilling groove of the work material when the drop is reduced, the diamond abrasive grains used for the core bit chip outside And supplying an abrasive grain size of 1/3 or less of.

The invention according to claim 2 is an elastically deformable container that is crushed when the external force is applied to the pump device of the invention according to claim 1 and is restored when the external force is released, and an abrasive in the container. Characterized in that the abrasive in the container is discharged from the nozzle when crushing by applying an external force to the container,
The invention according to claim 3 is characterized in that, in the invention according to claim 2, the nozzle is formed of a straw-like tube that is rotatably inserted into the container.

  The invention according to claim 4 is the invention according to claims 1 to 3, characterized in that the container is made of plastic and has a size that can be grasped with one hand.

  According to the invention according to claim 1, by using an internal dust collection type perforation device that sucks outside air into the core bit as the perforation device, it is possible to supply the abrasive material as it is without any modification to the conventional perforation device. The simple structure of the drilling device can be maintained, and the abrasive is supplied only when the drilling speed is lowered, so that the amount of abrasive used can be reduced, the cost can be reduced, and the supply to the drilling groove The abrasive can easily reach the cutting edge through the perforation groove by suction into the core pit and promote the dressing action of the cutting edge, and the protrusion of the diamond abrasive grain surface used for the core bit chip is In a healthy state, since it is approximately 1/3 or less of the particle diameter of diamond abrasive grains, an abrasive having a particle diameter of 1/3 or less of the outer diameter of diamond abrasive grains is used. The abrasive will be able reliably supplied to the cutting edge by a, an effect equal.

  According to the second aspect of the present invention, when an external force is applied to the container and crushed, the air in the container is discharged from the nozzle together with the abrasive, and the discharge amount of the abrasive is crushed by a certain amount with the handful of the container. Therefore, the pump device is composed of a container and a nozzle, and the structure is simple.

  According to the third aspect of the present invention, when the nozzle is clogged with the abrasive, it is easy to replace the nozzle or remove the nozzle for cleaning. In addition, by changing the direction of the nozzle, it can be applied to drilling in all directions such as downward, lateral, upward.

  According to the invention concerning Claim 4, a container is lightweight and cheap, and it can pump by one-hand operation.

Schematic of a core drill as a drilling device used in the method of the present invention. Sectional drawing of a pump apparatus. Sectional drawing when crushing a pump instrument and discharging abrasives. Sectional drawing of the principal part of a core drill when inject | pouring an abrasives during drilling.

  FIG. 1 shows a core drill 1 as a drilling device used in the method of the present invention. The core drill 1 is detachably fixed to a work material such as concrete, and a column projecting from the base 2. 3, a head 4 slidably mounted on the column 3, a feed device for the head 4 composed of a pinion rack mechanism, and a drive device that is rotatably supported by the head 4 and composed of a motor 6 with a speed reducer. A hollow shaft 7 and a core bit 8 that is detachably attached to the hollow shaft 7. The hollow shaft 7 includes a swivel joint 11, and a dust collector (not shown) is connected to the swivel joint 11 via a hose 12. ing.

  The core bit 8 is coupled to the hollow shaft 7 by screwing, a tube 15 connected to the coupling 14, and a cutting edge portion 16 formed of diamond abrasive grains and made of a chip fixed to the tube tip. And more.

  FIG. 2 shows a pump device 21 for discharging an abrasive, which is made of a resin made of a resin, for example, polyethylene terephthalate, having a size that can be clamped with one hand by tapering the upper portion and opening the upper end. A bottle-shaped container 22, a cap 23 that is detachably attached to the upper end of the container 22, and a straw-shaped nozzle 24 that is bent at a right angle and is rotatably inserted into the cap 23. Thus, for example, a silicon carbide-based or alumina-based abrasive 25 is placed in the container 22, and when the container 22 is grasped with one hand and is grasped and crushed by a certain amount (FIG. 3), the abrasive 25 in the container is almost The liquid is discharged through a fixed amount nozzle 24. When the grip is released and the external force is released, the container 22 is restored to the state shown in FIG.

  The abrasive 25 has a particle size of about 0.1 to 0.3 mm, which is 1/3 or less of the outer diameter of the diamond abrasive used in the chip, and the inner diameter and length of the nozzle 24 can be changed depending on the size. In the case of a large particle size, the nozzle 24 is shortened.

  At the time of drilling, when the core bit 8 of the core drill 1 is rotationally driven, the cutting edge 18 is cut into the work material 18 as shown in FIG. 4 to form an annular drilling groove 19. The dust collector sucks air in the core bit through the hose 12, the swivel joint 11 and the hollow shaft 7 at the start of drilling. As a result, outside air outside the core bit is sucked into the perforation groove 19, and the blade edge portion 16 is air-cooled and sucked into the core bit together with dust generated by the perforation. Then, it reaches the dust collector via the path.

  When the drilling speed decreases due to crushing during drilling, as shown in FIG. 3, the pump device 21 is grasped, and a handful is crushed to inject a certain amount of abrasive toward the drilling groove 19 from the outside of the core bit. If a single crushing operation is insufficient to inject the abrasive, the process is repeated several times.

The injected abrasive is sucked into the core bit together with the outside air, and performs the dressing action of the blade edge portion in the perforated groove. After being sucked into the core bit, it is collected together with dust by a dust collector.
In the above embodiment, the pump device includes the container 22, the cap 23, and the nozzle 24, but any pump device can be used as long as it can supply the powder, for example, driven by power, It may not be manually operated.

1. Core drill 4 Head 7. Hollow shaft 8 Core bit 11 Swivel joint 12 Hose 16 Blade edge 19 Drilling groove 21 Pump device 22 Container 24 Nozzle 25 ..Abrasive materials

Claims (4)

  Perforation having a core bit having a cutting edge at the tip, a hollow shaft to which the core bit is detachably attached, and rotationally driven by a driving device, and a dust collector connected to a swivel joint provided on the hollow shaft via a hose A method of drilling a work material using an apparatus, wherein the dust collector collects outside air outside the core bit through a drilling groove and sucks the core bit into the core bit to cool the tip of the core bit. In a drilling method in which dust is sucked out together with outside air through a hollow shaft, swivel joint and hose, a work material is used when the drilling speed during drilling is reduced by using a pump device that supplies abrasives to the drilling site by manual operation. Polishing with a diameter of 1/3 or less of the outer diameter of diamond abrasive grains used for core bit chips from the outside of the core bit in the perforated grooves Drilling method and supplying the.   The pump device comprises an elastically deformable container that is crushed when an external force is applied and is restored when the external force is released, and a nozzle that is provided in the container and that discharges abrasive material in the container. 2. The drilling method according to claim 1, wherein when crushed, the abrasive in the container is discharged from a nozzle.   3. The perforating method according to claim 2, wherein the nozzle is formed of a straw-like tube that is rotatably inserted into the container.   The perforation method according to any one of claims 1 to 3, wherein the container is made of plastic and has a size that can be grasped with one hand.