JP2018001302A - Honeycomb core drilling tool, honeycomb core drilling method and honeycomb core drilling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily perform drilling of a honeycomb core.SOLUTION: A honeycomb core drilling tool has a cylindrical body which has an opening end on at least a drilling side of a honeycomb core and at the other end of which a rotary shaft is provided, and abrasive grains which are firmly adhered to the opening end of the body. The body is provided with an open hole which applies a force for discharging an end material of the honeycomb core jammed in an interior of the body from the interior of the body, to the end material after drilling of the honeycomb core.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a honeycomb core drilling tool, a honeycomb core drilling method, and a honeycomb core drilling machine.

  2. Description of the Related Art Conventionally, as a method for drilling a drilling object such as concrete, a method of hollowing out a part of the drilling object by rotating a cylindrical tool is known.

  However, when a part of an object to be drilled is cut out using a cylindrical tool, the cut end material may be clogged inside the cylindrical tool. When the cut end material is stuck inside the cylindrical tool, it is necessary to discharge the end material from the tool before performing the next drilling using the tool.

  In view of this, a cylindrical core drill having a special structure capable of easily discharging a concrete end material by its own weight or the like has been proposed (see, for example, Patent Document 1).

  In addition, in a cylindrical tool with a diamond tip fixed to the tip, a technique has also been proposed that makes it easy to discharge the end material from the tool by arranging the diamond tip so that the diamond tip does not protrude inside the cylindrical tool. (For example, refer to Patent Document 2).

JP 2004-202669 A Japanese Patent Laid-Open No. 11-042634

  However, when the object to be drilled by the cylindrical tool is a honeycomb core, the end material cut out inside the cylindrical tool is more easily clogged than when drilling concrete. This is presumably because the plate material constituting the honeycomb core is easily deformed unlike concrete. That is, the hollow end material of the honeycomb core is clogged so as to be in close contact as a whole in a state where the end portions of the plurality of plate materials are pressed inside the cylindrical tool. For this reason, it becomes difficult to discharge the end material of the packed honeycomb core from the inside of the tool. As a result, it becomes difficult to perforate the honeycomb core itself using a cylindrical tool.

  However, the honeycomb core is not brittle like concrete. In particular, when a honeycomb core is used as a constituent member of an aircraft structure, the honeycomb core is often made of a metal or a composite material. Therefore, it is conceivable to drill the honeycomb core using a typical drill having a centering function. However, since there are many voids in the honeycomb core, it is considered almost impossible to center the honeycomb core using a general-purpose drill.

  Accordingly, an object of the present invention is to enable easy drilling of a honeycomb core.

  A honeycomb core drilling tool according to an embodiment of the present invention has a cylindrical body having an opening end on at least a honeycomb core drilling side and a rotating shaft at the other end, and is fixed to the opening end of the body. Abrasive grains. The body is provided with a through-hole for allowing the end material to have a force for discharging the end material of the honeycomb core clogged inside the body after the perforation of the honeycomb core from the inside of the body.

  Further, the honeycomb core drilling method according to the embodiment of the present invention is a honeycomb core drilling tool in which abrasive grains are fixed to the opening end of a cylindrical body provided with a through-hole, and a rotary shaft is provided at the other end. The step of manufacturing the perforated product of the honeycomb core by punching the honeycomb core by bringing the abrasive grains into contact with the honeycomb core while holding and rotating the rotating shaft, and after the punching of the honeycomb core, By applying the force for discharging from the inside of the body to the end material of the honeycomb core clogged in the body using the through hole, the end material clogged in the body is And a step of discharging from the body.

  A honeycomb core drilling machine according to an embodiment of the present invention includes the honeycomb core drilling tool, a rotation mechanism, a robot arm to which the rotation mechanism is attached, an air supply system, and a control device. The rotating mechanism holds the honeycomb core drilling tool. The air supply system supplies the compressed air to the air supply port of the honeycomb core drilling tool. The control device controls a drive shaft of the rotation mechanism and the robot arm.

The fragmentary longitudinal cross-section which shows the structure of the honeycomb core drilling tool which concerns on the 1st Embodiment of this invention. The left view of the honeycomb core drilling tool shown in FIG. The fragmentary longitudinal cross-section which shows the structure of the honeycomb core drilling tool which concerns on the 2nd Embodiment of this invention. The left view of the honeycomb core drilling tool shown in FIG. The front view which shows the structural example of the end material of the honeycomb core by which the space | gap was obstruct | occluded with the board | plate material. The top view of the end material shown in FIG. The perspective view of the honeycomb core drilling machine which attached the honeycomb core drilling tool shown in FIG. The perspective view which looked at the honeycomb core drilling machine shown in FIG. 7 from another direction. The longitudinal cross-sectional view which shows the detailed structural example of the attachment mechanism shown in FIG. The partial expanded longitudinal cross-sectional view which shows the structure of the honeycomb core drilling tool which concerns on the 3rd Embodiment of this invention. FIG. 11 is a partially enlarged longitudinal sectional view compared for explaining the structure of the honeycomb core drilling tool shown in FIG. 10.

  A honeycomb core drilling tool, a honeycomb core drilling method, and a honeycomb core drilling machine according to an embodiment of the present invention will be described with reference to the accompanying drawings.

(First embodiment)
(Honeycomb core drilling tool)
FIG. 1 is a partial longitudinal sectional view showing the structure of a honeycomb core drilling tool according to a first embodiment of the present invention, and FIG. 2 is a left side view of the honeycomb core drilling tool shown in FIG.

  The honeycomb core drilling tool 1 is a drilling tool having a cylindrical blade portion 2 for drilling a honeycomb core. Specifically, the honeycomb core drilling tool 1 is configured by forming a blade portion 2 on a body 3. The honeycomb core to be drilled by the honeycomb core drilling tool 1 is a structure in which a large number of rectangular tubes (cells) having the same cross-sectional shape such as a hexagon are arranged without gaps.

  The honeycomb core has a feature that it is small in weight and high in strength. For this reason, it is often used as a material for aircraft structures that require weight reduction. An example of the material of the honeycomb core itself is metal, but particularly in the case of a honeycomb core used as a member of an aircraft structure, a carbon fiber reinforced plastic (CFRP) is used for further weight reduction and strength improvement. In many cases, composite materials such as Carbon Fiber Reinforced Plastics (GFRP) and glass fiber reinforced plastics (GFRP) are used as a material. In some cases, a composite material called Nomex (registered trademark) in which paper is impregnated with resin is used as a material for the honeycomb core.

  The body 3 of the honeycomb core drilling tool 1 has a cylindrical structure having an open end at least on the drilling side of the honeycomb core and a rotating shaft 4 provided on the other end. A large number of abrasive grains 2A are fixed to the opening end of the body 3, and the edge portion 2 is formed by the end of the body 3 to which the abrasive grains 2A are fixed. The material of the abrasive grains 2A is typically diamond or cubic boron nitride (CBN), but alumina or silicon carbide may be used depending on the material of the honeycomb core to be drilled. The abrasive grains 2A can be fixed to the end of the body 3 by any method such as electrodeposition.

  The opening end of the body 3 can be provided with zigzag irregularities as shown. The abrasive grains 2A can be fixed to the inner surface, the outer surface, and the end surface of the plate-like end portions having zigzag irregularities.

  If it does so, the cylindrical blade part 2 which has a zigzag-like unevenness | corrugation, and to which the abrasive grain 2A was fixed will function like a saw (saw). That is, when the rotary shaft 4 is held and rotated by the holder, the plurality of plate-like convex portions constituting the cylindrical blade portion 2 function as a plurality of blades (saw blades) arranged in a circle. For this reason, if the blade portion 2 is pressed against the honeycomb core while rotating, the honeycomb core can be perforated.

  In this case, perforation of the honeycomb core is performed by cutting the honeycomb core into a circular shape with the blade portion 2 that functions as a saw. Further, the cutting of the honeycomb core is performed by grinding with the abrasive grains 2A moving along a circular locus. For this reason, the honeycomb core drilling tool 1 can also be classified as a drilling saw or a grinding tool.

  The diameter of the through hole formed in the honeycomb core is the outer diameter of the blade portion 2. Therefore, the outer diameter of the body 3 and the outer diameter of the blade portion 2 are determined according to the diameter of the through hole to be formed in the honeycomb core. As a specific example, in the case of a honeycomb core for an aircraft structure, the outer diameter of the body 3 is determined to be about several cm to 10 cm. On the other hand, the length of the body 3 is determined so as to be at least longer than the thickness of the honeycomb core so that the inner wall of the body 3 on the rotating shaft 4 side does not interfere with the end material of the honeycomb core when the honeycomb core is perforated. Is done.

  After the piercing of the honeycomb core, the end material of the cylindrical honeycomb core remains in the body 3. For this reason, in order to perform the next drilling with the honeycomb core drilling tool 1, it is necessary to remove the end material remaining in the body 3. However, the surface of the cylindrical end material of the honeycomb core made of a composite material, metal, or the like becomes the ends of a large number of cut thin plates. For this reason, the end material of the honeycomb core is easily deformed and clogged inside the body 3 while receiving a compressive force.

  Therefore, the body 3 is provided with a through-hole 5 for causing the end material to have a force for discharging the end material of the honeycomb core clogged inside the body 3 after the perforation of the honeycomb core from the inside of the body 3. . Specifically, a through hole 5 for inserting an extrusion rod 6 for extruding the end material from the inside of the body 3 is provided on the side surface of the body 3.

  In order to extrude the end material from the inside of the body 3, the extruding rod 6 is slid in the longitudinal direction of the body 3, that is, the tool axis direction of the honeycomb core drilling tool 1 while pressing the extruding rod 6 against the end material in the body 3. Is effective. Therefore, as shown in the drawing, it is practical to provide a slit 5A having the length direction as the tool axis direction of the honeycomb core drilling tool 1 as a through hole 5 on the side surface of the body 3. Thereby, the extrusion rod 6 can be slid in the tool axis direction of the honeycomb core drilling tool 1 with a part of the extrusion rod 6 being inserted into the body 3.

(Honeycomb core drilling method)
Next, a method for drilling a honeycomb core using the honeycomb core drilling tool 1 will be described.

  When the honeycomb core drilling tool 1 is used to drill the honeycomb core, the honeycomb core drilling tool 1 is attached to a tool driving device having a rotating mechanism. For example, the rotating shaft 4 of the honeycomb core drilling tool 1 can be held by a holder of a hand-held tool driving device that is rotationally driven by compressed air or the like. Then, while holding and rotating the honeycomb core drilling tool 1 with a tool driving device, the abrasive grains 2A of the blade portion 2 are brought into contact with the honeycomb core, and the plate material constituting the honeycomb core with the abrasive grains 2A moving through the circular track The honeycomb core can be cut into a circular shape by scraping off.

  When the honeycomb core drilling tool 1 is fed in the tool axis direction together with the tool driving device, and the honeycomb core is completely cut by the blade portion 2, the end material of the cylindrical honeycomb core is clogged in the body 3, and the product Or it cuts out from the honeycomb core used as a semi-finished product. For this reason, when the honeycomb core drilling tool 1 is pulled out, a through hole is formed in the honeycomb core. That is, the drilling of the honeycomb core is completed.

  When the number of through holes to be drilled is one, the manufacture of the honeycomb core drilled product is completed. However, in order to perform the next drilling of the honeycomb core, it is necessary to discharge the end material of the honeycomb core clogged in the body 3 from the body 3 after the drilling of the honeycomb core. On the other hand, even when there are other through holes to be drilled, it is necessary to discharge the end material of the honeycomb core clogged in the body 3 from the body 3.

  Therefore, by using the through hole 5 of the body 3 to apply a force for discharging the end material from the inside of the body 3 to the end material, the end material clogged inside the body 3 is discharged. Specifically, the push rod 6 is inserted into a slit 5 </ b> A provided as a through hole 5 on the side surface of the body 3. Then, the end material can be discharged from the body 3 by pushing the end material toward the opening end side of the body 3 with the inserted push rod 6. In particular, since the end material is a honeycomb core, the end material can be scraped out from the body 3 while being crushed by the extrusion rod 6.

  For this reason, when there is one through hole to be drilled, the honeycomb core drilling tool 1 can drill the next honeycomb core. On the other hand, when there are other through holes to be drilled, it is possible to perform drilling at different positions. When a plurality of through-holes are formed in the honeycomb core, the plurality of through-holes are formed by repeating drilling by rotational driving of the honeycomb core drilling tool 1 and discharging the end material clogged inside the body 3. A drilled product of the formed honeycomb core can be manufactured.

(effect)
In the honeycomb core drilling tool 1 and the honeycomb core drilling method as described above, the end material of the honeycomb core clogged inside the body 3 is scraped by the extrusion rod 6 on the side surface of the body 3 provided with the cylindrical blade portion 2. A slit 5 </ b> A is provided as the through hole 5 so as to be able to perform.

  For this reason, the end material of the honeycomb core clogged in the body 3 after the perforation of the honeycomb core can be easily discharged. As a result, conventionally, when a honeycomb core is drilled using a cylindrical drilling tool that assumes drilling of concrete or the like, it is difficult to remove the end material from the drilling tool. Although it has been considered difficult to drill a honeycomb core using a tool, a cylindrical drilling tool can be used for drilling a honeycomb core. In other words, it is possible to drill a honeycomb core by providing a simple structure to a cylindrical drilling tool without developing a special drilling tool having a special and complicated structure for drilling a honeycomb core. Become.

(Second Embodiment)
(Honeycomb core drilling tool)
FIG. 3 is a partial longitudinal sectional view showing the structure of a honeycomb core drilling tool according to a second embodiment of the present invention, and FIG. 4 is a left side view of the honeycomb core drilling tool shown in FIG.

  In the honeycomb core drilling tool 1A according to the second embodiment shown in FIG. 3, the end material of the honeycomb core clogged inside the body 3 can be discharged using compressed air. Different from the honeycomb core drilling tool 1. Since the configuration and operation of the other parts of the honeycomb core drilling tool 1A in the second embodiment are not substantially different from those of the honeycomb core drilling tool 1 in the first embodiment, the same or corresponding parts have the same reference numerals. The description is omitted.

  The body 3 of the honeycomb core drilling tool 1 </ b> A is provided with an air supply port 5 </ b> B as a through hole 5 for injecting compressed air for extruding a honeycomb core end material from the inside of the body 3 by air pressure. It is done. In order to push the end material from the inside of the body 3 toward the opening end side, it is necessary to inject compressed air into the space on the rotating shaft 4 side of the end material clogged in the body 3. Therefore, the air supply port 5B is provided at a position where compressed air can be injected into the space on the rotary shaft 4 side of the end material.

  In the illustrated example, an air supply port 5 </ b> B is provided on the rotating shaft 4 of the body 3. More specifically, the rotating shaft 4 side of the cylindrical body 3 is closed with a disk-shaped plate, and a hollow cylindrical tube that also serves as the rotating shaft 4 is connected to the disk-shaped plate with an air supply port. 5B is provided. Therefore, when the end material of the columnar honeycomb core is clogged on the opening end side of the body 3, an air supply port is formed in the space in the body 3 generated between the end material and the disk-shaped plate on the rotating shaft 4 side. Compressed air can be injected from 5B.

  In addition, you may form an air supply port not only in the illustrated example but in parts other than the rotating shaft 4. FIG. For example, a component that slides rotatably with respect to the body 3 may be attached via a bearing or the like, and an air supply port may be formed in the component. However, as shown in the figure, if the air supply port 5B is formed in the rotating shaft 4 of the body 3, the structure of the body 3 can be extremely simplified.

  When compressed air is injected from the air supply port 5 </ b> B, the end material can be pushed out toward the opening end side of the body 3 by at least the flow of air, and the end material can be discharged from the body 3. In particular, when at least one surface of the honeycomb core to be perforated is closed with a plate material, the open end side of the body 3 is closed with the airtight body maintained to some extent by the end material.

  FIG. 5 is a front view showing a structural example of the end material of the honeycomb core in which the gap is closed with a plate material, and FIG. 6 is a top view of the end material shown in FIG.

  When a large number of voids in the honeycomb core to be perforated are closed with a plate material, the honeycomb core remaining as the end material W is also closed with the plate material W1 as illustrated in FIGS. For this reason, compressed air does not flow into a large number of voids in the honeycomb core that has become the end material W. In addition, the plate material W1 that closes the honeycomb core is clogged inside the body 3 in a state of being cut into a disk shape. That is, the gap between the end member W of the honeycomb core including the plate material W1 and the body 3 is also very small.

  As a result, if compressed air is continuously injected into the space in the body 3 generated between the end material W and the disk-shaped plate on the rotating shaft 4 side, the air pressure in the space gradually increases. For this reason, the end material W can be pushed out toward the opening end side of the body 3 by air pressure, and the end material W can be discharged from the body 3 by the same principle as the air gun.

  When the honeycomb core is used as a panel member for an aircraft wing structure or the like, both sides of the honeycomb core are often blocked by a plate material. That is, a honeycomb core having a predetermined thickness with both surfaces closed by a plate material is often used as an aircraft panel. In the case of drilling a honeycomb core whose at least one surface is closed with a plate material, by utilizing the fact that the end material W is clogged with a state in which an airtight body is maintained in the body 3, The end material W can be discharged.

  Actually, drilling was performed with the honeycomb core drilling tool 1A for a honeycomb core panel whose both surfaces were closed with a plate material, and a test for confirming whether the end material W could be reliably discharged by supplying compressed air was performed. . As the material for the honeycomb core and the plate material for closing the honeycomb core, GFRP and a composite material in which paper is impregnated with resin were used. As a result, if the outer diameter of the body 3 is about several centimeters to about 10 centimeters, regardless of whether the fiber constituting the composite material that is the material of the honeycomb core is glass or paper, the diameter is about 3 mm to 4 mm. It was confirmed that the end material W can be discharged by injecting compressed air having a pressure of about 0.1 MPa to 0.5 MPa from the air supply port 5B.

  In particular, it was confirmed that the required pressure of the compressed air to be supplied can be reduced by increasing the size of the air supply port 5B and increasing the supply amount of the compressed air. This is because if the amount of compressed air supplied to the sealed space in the body 3 is increased, the air pressure in the sealed space is necessary for discharging the end material W even if some compressed air leaks from the sealed space. This is probably because the pressure can be increased. For this reason, by optimizing the dimensions of the honeycomb core drilling tool 1A, the end material W is discharged from the honeycomb core drilling tool 1A using compressed air having a practical pressure that can be easily supplied at a factory or the like. Can do.

  If the honeycomb core drilling tool 1A having the above structure is used, the end material W clogged in the body 3 can be easily discharged as in the honeycomb core drilling tool 1 in the first embodiment. . For this reason, the honeycomb core can be drilled using a cylindrical drilling tool. In addition, if the honeycomb core drilling tool 1A that discharges the end material W with compressed air is used, it is possible to automate the drilling of the honeycomb core using an arbitrary device equipped with a rotation mechanism and a compressed air supply system. Become.

(Honeycomb core drilling machine)
Next, an example of a honeycomb core drilling machine for automatically drilling a honeycomb core using the honeycomb core drilling tool 1A will be described.

  FIG. 7 is a perspective view of the honeycomb core drilling machine 10 to which the honeycomb core drilling tool 1A shown in FIG. 3 is attached. FIG. 8 is a perspective view of the honeycomb core drilling machine 10 shown in FIG. .

  As illustrated in FIGS. 7 and 8, the honeycomb core drilling machine 10 can be configured by holding the honeycomb core drilling tool 1 </ b> A by the robot arm 12 of the robot 11 having an articulated arm or the like. More specifically, the rotation mechanism 13 can be attached to the robot arm 12, and the honeycomb core drilling tool 1A can be held by the rotation mechanism 13. Furthermore, an air supply system 14 for supplying compressed air to the air supply port 5B of the honeycomb core drilling tool 1A is provided. The air supply system 14 is connected to a compressed air supply tank 15 installed in a factory or the like.

  The rotating mechanism 13 and the air supply system 14 for holding and rotating the honeycomb core drilling tool 1A are housed in a common casing 16 and the mechanism 17 for attaching the honeycomb core drilling tool 1A to the robot arm 12 as shown in the figure. Can be offered as.

  FIG. 9 is a longitudinal sectional view showing a detailed configuration example of the attachment mechanism 17 shown in FIG. However, the housing 16 of the attachment mechanism 17 is omitted in FIG.

  As illustrated in FIG. 9, the compact rotation mechanism 13 can be configured by providing the output shaft 17B of the motor 17A coaxially with the rotation shaft 4 of the honeycomb core drilling tool 1A. Alternatively, the output shaft 17B of the motor 17A is not provided coaxially with the rotary shaft 4 of the honeycomb core drilling tool 1A, but via a gear or the like provided between the output shaft of the motor and the rotary shaft 4 of the honeycomb core drilling tool 1A. The power of the motor may be transmitted to the rotating shaft 4 of the honeycomb core drilling tool 1A. A holder 17C is fixed to the output shaft 17B of the motor 17A, and the rotary shaft 4 of the honeycomb core drilling tool 1A can be held by the holder 17C.

  A through-hole 17D can be formed in the output shaft 17B of the motor 17A as a compressed air supply path. One end of a through hole 17D formed in the output shaft 17B of the motor 17A is connected to the air supply port 5B of the honeycomb core drilling tool 1A. On the other hand, the other end of the through hole 17D formed in the output shaft 17B of the motor 17A is connected to the coupler 17F through the gap 17E. The coupler 17F can be directly or indirectly connected to the compressed air supply tank 15 by a hose. Thereby, the air supply system 14 which supplies compressed air from the coupler 17F to the air supply port 5B of the honeycomb core drilling tool 1A via the through hole 17D formed in the output shaft 17B of the motor 17A can be formed.

  The rotation mechanism 13 and the air supply system 14 can be housed in the common housing 16 as described above. In other words, the attachment mechanism 17 of the honeycomb core drilling tool 1A including the rotation mechanism 13 and the air supply system 14 can be manufactured.

  The rotation mechanism 13 that holds and rotates the honeycomb core drilling tool 1 </ b> A and the drive shaft of the robot arm 12 can be automatically controlled by the control device 18 of the robot 11. The switching of the supply of compressed air from the air supply system 14 to the honeycomb core drilling tool 1A may be controlled by another control device or may be controlled by the control device 18 of the robot 11.

  If the control device 18 of the robot 11 can control the supply timing of the compressed air, the honeycomb core drilling tool 1A is rotated to drill the honeycomb core, and then the compressed air is quickly supplied to the air of the honeycomb core drilling tool 1A. Control of supplying the material W from the supply port 5B into the body 3 and discharging the end material W of the honeycomb core from the body 3 is facilitated. Of course, even when the supply timing of the compressed air is controlled by another control device, the synchronization process can be performed with the control device 18 of the robot 11.

  When the honeycomb core drilling machine 10 performs the drilling of the honeycomb core, the rotary shaft 4 of the honeycomb core drilling tool 1A is held by the holder 17C attached in advance to the rotating mechanism 13 provided in the robot arm 12. Then, the honeycomb core drilling tool 1A is rotated by driving the rotation mechanism 13 under the control of the control device 18.

  Subsequently, the drive shaft of the robot arm 12 is driven by the control of the control device 18, and the honeycomb core drilling tool 1A is positioned. That is, the honeycomb core drilling tool 1A is positioned at the drilling position of the honeycomb core. When the positioning of the honeycomb core drilling tool 1A is completed, the honeycomb core drilling tool 1A is sent out in the tool axis direction, that is, the drilling direction by driving the robot arm 12. A feed mechanism for feeding the honeycomb core drilling tool 1A in the tool axis direction may be provided in the attachment mechanism 17. In that case, the honeycomb core drilling tool 1A is fed in the drilling direction by driving the feed mechanism.

  When the blade portion 2 of the honeycomb core drilling tool 1A comes into contact with the honeycomb core, drilling by cutting the honeycomb core is started. Furthermore, when the honeycomb core drilling tool 1A is fed in the tool axis direction by a distance corresponding to the thickness of the honeycomb core, the honeycomb core is cut into a circular shape, and a through hole can be formed in the honeycomb core. That is, the honeycomb core can be perforated.

  When the honeycomb core is cut into a circular shape, the columnar end material W remains in the body 3 of the honeycomb core drilling tool 1A. Therefore, the compressed air is injected from the air supply port 5B of the honeycomb core drilling tool 1A into the space in the body 3 on the rotating shaft 4 side of the end material W through the compressed air supply path provided in the robot arm 12. As a result, the air pressure in the space increases, and the end material W can be pushed out from the body 3.

  When the end material W is pushed out from the body 3, the next drilling can be performed using the honeycomb core drilling tool 1A. For example, by driving the robot arm 12, the honeycomb core drilling tool 1A can be positioned at another drilling position of the same honeycomb core, and drilling using the honeycomb core drilling tool 1A can be performed. Alternatively, drilling using another honeycomb core drilling tool 1A can be performed.

(effect)
The honeycomb core drilling tool 1A in the second embodiment as described above is configured such that the end material W clogged in the body 3 after the honeycomb core is drilled can be discharged with compressed air. On the other hand, the honeycomb core drilling machine 10 is configured to automatically perform the drilling of the honeycomb core using the honeycomb core drilling tool 1A and the discharge of the end material W using the compressed air.

  For this reason, according to the honeycomb core drilling tool 1A, the end material W clogged in the body 3 can be automatically removed. As a result, as exemplified by the honeycomb core drilling machine 10 using the robot 11, both the drilling of the honeycomb core and the end material W can be automated. Further, not only the honeycomb core drilling machine 10 using the robot 11, but also a honeycomb core drilling tool 1A may be attached to the main shaft of a machine tool such as a machining center, a milling machine or a drilling machine so that compressed air can be supplied.

  For this reason, the discharge work of the end material W by a worker's manual work becomes unnecessary. Further, since the end material W can be automatically discharged, the honeycomb core can be continuously perforated. In addition, by appropriately determining the size of the honeycomb core drilling tool 1A such as the air supply port 5B, the end material W using compressed air having realistic pressure that can be easily procured in a factory or the like. Can be discharged.

  Various methods can be considered as a method for automatically discharging the end material of the honeycomb core packed in the cylindrical drilling tool. As a specific example, a method in which a spring is provided in a cylindrical drilling tool and the end material is pushed out by the spring can be considered. However, when the honeycomb core material is a composite material, it is necessary to rotate the cylindrical drilling tool at a higher speed than when drilling concrete or the like in accordance with the mechanical characteristics of the composite material. As a result, when the composite material is a perforation target, an excessive load may be applied to the spring and the spring may be damaged. For this reason, with a cylindrical drilling tool provided with a spring inside, it is difficult to drill a honeycomb core made of a composite material.

  Another method is to form an air flow with a fan. In view of this, a cylindrical drilling tool in which a propeller-type fan is provided on the holder side so that air can be fed in the tool axis direction was prototyped, and a test was conducted to see if the end material of the honeycomb core could be discharged. We also prototyped a cylindrical drilling tool that was equipped with a sirocco fan so that air could be taken in from the rotating surface and tested to see if the end material of the honeycomb core could be discharged. As a result, when pumping air with a fan such as a propeller fan or a sirocco fan, it can be discharged if it is dust like dust, but it cannot discharge the end material of the cylindrical honeycomb core that is clogged by compressive force. It was confirmed.

  On the other hand, as described above, particularly when the honeycomb core whose pores are closed with a plate material is a perforation target, the end material W of the honeycomb core is more reliably discharged by the increase in air pressure due to the supply of compressed air. It was confirmed that it was possible.

(Third embodiment)
FIG. 10 is a partially enlarged longitudinal sectional view showing the structure of the honeycomb core drilling tool according to the third embodiment of the present invention, and FIG. 11 is compared to explain the structure of the honeycomb core drilling tool shown in FIG. It is a partial expanded longitudinal cross-sectional view.

  In the honeycomb core drilling tool 1B according to the third embodiment shown in FIG. 10, the structure of the blade portion 2 formed at the end of the body 3 by fixing the abrasive grains 2A is the honeycomb core according to the first embodiment. This is different from the drilling tool 1 and the honeycomb core drilling tool 1A in the second embodiment. The configuration and operation of the other parts of the honeycomb core drilling tool 1A in the third embodiment are not substantially different from the honeycomb core drilling tool 1 in the first embodiment and the honeycomb core drilling tool 1B in the second embodiment. Therefore, only the structure of the blade part 2 is illustrated, and the same or corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 11, when the blade portion 2 is formed by fixing the abrasive grains 2A to the end portion of the body 3 having a constant plate thickness, the inner surface side of the body 3 has a slight amount corresponding to the thickness of the abrasive grains 2A. A significant step will occur. The level difference due to the fixing of the abrasive grains 2A may hinder smooth discharge of the end material W of the honeycomb core.

  Therefore, as shown in FIG. 10, by reducing the thickness on the opening end side of the body 3, a step is provided on the inner surface on the opening end side, and the abrasive grains 2 </ b> A are fixed to the step so that the abrasive grains 2 </ b> A are attached to the body 3. It is possible not to project on the inner surface side. That is, the structure of the body 3 and the blade portion 2 can be designed so that the level difference corresponding to the thickness of the abrasive grain 2A is reduced on the inner surface side of the body 3.

  Thereby, the inner diameter of the portion of the blade portion 2 to which the abrasive grains 2A are fixed is equal to the inner diameter of the portion of the body 3 to which the abrasive grains 2A are not fixed, that is, the portion adjacent to the blade portion 2, and the end of the honeycomb core. The material W can be discharged from the body 3 more smoothly.

  Actually, the honeycomb core drilling tool 1B in which the protrusion of the abrasive grains 2A is reduced by making the thickness of the body 3 in the portion forming the blade portion 2 thinner than the thickness in the portion adjacent to the blade portion 2 is manufactured. did. Then, a test was performed to determine whether or not the effect of facilitating the discharge of the end material W by compressed air was obtained using a honeycomb core panel whose both surfaces were closed with the plate material W1 as a perforation target. As a result, if the blade portion 2 is formed such that the thickness at the opening end side of the body 3 is reduced and no step is generated, the end material W is reduced compared to the case where the thickness at the opening end side of the body 3 is constant. It was confirmed that the pressure of compressed air required for discharging can be drastically reduced.

(Other embodiments)
Although specific embodiments have been described above, the described embodiments are merely examples, and do not limit the scope of the invention. The novel methods and apparatus described herein can be implemented in a variety of other ways. Various omissions, substitutions, and changes can be made in the method and apparatus described herein without departing from the spirit of the invention. The appended claims and their equivalents include such various forms and modifications as are encompassed by the scope and spirit of the invention.

  For example, the first embodiment and the second embodiment can be combined. That is, both of the air supply port 5B for supplying compressed air and the through hole 5 such as the slit 5A for inserting the push rod 6 leak from the through hole 5 for inserting the push rod 6. It can be provided at an appropriate position of the body 3 so as not to come out. And a honeycomb core drilling tool can be comprised so that both discharge | emission of the end material W using the extrusion rod 6 and discharge | emission of the end material W by compressed air can be implemented. Further, when discharging the end material W using compressed air, the operator manually connects the compressed air supply hose and the like to the honeycomb core drilling tool without automating the discharge of the end material W. You may do it.

DESCRIPTION OF SYMBOLS 1, 1A, 1B Honeycomb core drilling tool 2 Blade part 2A Abrasive grain 3 Body 4 Rotating shaft 5 Through-hole 5A Slit 5B Air supply port 6 Extrusion rod 10 Honeycomb core drilling machine 11 Robot 12 Robot arm 13 Rotating mechanism 14 Air supply system 15 Compressed air supply tank 16 Housing 17 Mounting mechanism 17A Motor 17B Output shaft 17C Holder 17D Through hole 17E Gap 17F Coupler 18 Controller W End material W1 Plate material

Claims (10)

A cylindrical body having an open end at least on the perforated side of the honeycomb core and having a rotation shaft at the other end;
Abrasive grains fixed to the open end of the body,
A honeycomb provided with a through hole in the body for causing the end material to have a force for discharging the end material of the honeycomb core clogged inside the body after the perforation of the honeycomb core from the inside of the body Core drilling tool.   The honeycomb core drilling tool according to claim 1, wherein a slit for inserting an extrusion rod for extruding the end material from the inside of the body is provided at least as the through hole on a side surface of the body.   An air supply port for injecting compressed air for extruding the end material from the inside of the body by air pressure into the space on the rotating shaft side of the end material is used as the through hole. The honeycomb core drilling tool according to claim 1 or 2, provided at least on the body.   The honeycomb core drilling tool according to claim 3, wherein the air supply port is provided in the rotating shaft of the body.   By reducing the thickness at the opening end side of the body, a step is provided on the inner surface at the opening end side, and the abrasive grains are fixed to the step so that the abrasive grains do not protrude on the inner surface side of the body. The honeycomb core drilling tool according to any one of claims 1 to 4. Abrasive grains are fixed to the opening end of a cylindrical body provided with a through-hole, while the abrasive grains are honeycombed while being held and rotated by a honeycomb core drilling tool provided with a rotary shaft at the other end. Producing a drilled article of the honeycomb core by punching the honeycomb core in contact with the core; and
By causing a force to be discharged from the inside of the body to act on the end material of the honeycomb core clogged inside the body after the perforation of the honeycomb core using the through holes, the inside of the body Discharging the clogged end material from the body;
A method for drilling a honeycomb core.   By inserting an extrusion rod into a slit provided as the through hole on the side surface of the body, and pushing the end material toward the opening end side of the body with the inserted extrusion rod, the end material is removed from the body. The honeycomb core drilling method according to claim 6, wherein the honeycomb core is perforated.   By injecting compressed air from the through hole into the space on the rotary shaft side of the end material inside the body, and pushing the end material toward the opening end side of the body by air pressure, the end The honeycomb core drilling method according to claim 6, wherein the material is discharged from the body. Drilling the honeycomb core with the honeycomb core drilling tool by holding and rotating the rotating shaft with a holder attached to a rotating mechanism provided in the robot arm,
The honeycomb core drilling method according to claim 8, wherein the compressed air is injected from the through hole into the space on the rotary shaft side of the end material through the compressed air supply path provided in the robot arm. A honeycomb core drilling tool according to claim 3 or 4,
A rotating mechanism for holding the honeycomb core drilling tool;
A robot arm to which the rotating mechanism is attached;
An air supply system for supplying the compressed air to the air supply port of the honeycomb core drilling tool;
A control device for controlling a drive shaft of the rotation mechanism and the robot arm;
Honeycomb core drilling machine.

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