JP5144695B2 - Drilling device for synthetic resin tank - Google Patents

Description

  The present invention relates to a tank drilling device, and more particularly to a device for drilling a circular hole in a synthetic resin tank used as a fuel tank of an automobile or the like.

  When drilling into the fuel tank, it is necessary to prevent the cut pieces from falling into the tank. For this reason, conventionally, as shown in FIG. 15A, a cutter 102 is provided at the center of rotation of the cutter blade 101, and the cutter blades 101, 101 are screwed and held at the center of the portion cut out by the drill 102. There has been proposed a device that performs a circular cut-out operation by a method of pushing in toward the inside of the tank 103 while rotating (Patent Document 1).

JP 2002-361505 A

  However, in the drilling device proposed in Patent Document 1, as shown in FIG. 15B, the chips 104 remain in the tank 103, and a work process for removing and inspecting them is necessary. There's a problem. Further, there is a problem that the tank 103 is deformed by the pushing of the cutter blade 101 and the blade 101 is broken.

  Accordingly, the present invention provides an apparatus that can prevent not only residual cutting pieces but also residual chips, does not cause deformation of the tank, and does not cause blade breakage. It was made as a purpose.

  The synthetic resin tank drilling device of the present invention made to achieve the above object is a drilling device for opening a circular hole in a synthetic resin tank, and has the following configuration. It is characterized by being.

(1) A cutting blade that is cylindrical and has a sharp cutting edge at the lower end, and a cutting blade that is disposed inside the cutting blade, and the angle between the rake face and the flank face is set to a positive acute angle. It has a cutting edge with a shape to scoop resin, and it is composed of a cutting blade with a projection or taper that hooks scrap inside, so that the cutting edge of the tearing blade protrudes beyond the cutting edge of the cutting blade It has an integrated composite blade.

  (2) A blade lifting device that lifts and lowers the composite blade, a blade rotating device that rotates the composite blade, a scrap processing device that processes scrap caught in the composite blade, the blade lifting device, and a blade rotating device. And a control device for driving and controlling the scrap processing device.

  (3) The control device raises the blade rotation device and the blade rotation device so that the composite blade and the tank are brought into contact with each other after the rotation number of the blade rotation device is increased to a predetermined rotation number, and cutting is started. It is configured to execute processing to control the drive.

  (4) When the cutting edge of the tearing blade penetrates the tank, the control device stops the lowering operation of the composite blade and removes the composite blade from the tank, and the scrap processing device is placed at a predetermined discharge position. It is comprised so that the process which drives and controls the said blade raising / lowering apparatus and scrap processing apparatus may be performed so that the scrap discharge operation | movement which drives and discharges the scrap stuck on the composite blade may be performed.

  According to the synthetic resin tank drilling device of the present invention, using a composite blade in which a cutting blade and a cutter blade are integrated, the material is cut with the cutter blade and the inside is sealed at the same time. Cut to remove material. At this time, since the cutting edge of the cutting blade is generally formed in a cross-sectional shape having a taper that widens toward the end, it is possible to penetrate the scraped scrap while being held in the cylindrical portion of the cutting blade. it can. In addition, it is good also as what was provided with the processus | protrusion which forms a screw-shaped groove | channel in the scrap outer peripheral surface in the inner surface of a cutting blade so that this scrap holding power may be exhibited more correctly. On the other hand, cutting waste generated at the time of cutting is confined in a space surrounded by the scrap and the blade. Further, unlike the conventional drilling process using only the tearing blade, the amount of biting of the tearing blade into the tank is small, so that the blade tip is not easily broken and a large pressing load is not applied to the tank. The scrap and cutting waste are discharged at a predetermined position by the scrap discharge operation. As a result, the cutting waste can be drilled into the synthetic resin tank without the scrap falling into the tank.

  Here, in the configuration of (4), as a method of bringing the composite blade out of the tank, either a method of raising the blade or a method of lowering the tank may be adopted. Further, the scrap discharge position can be either a position shifted in the horizontal direction from a position where the drilling process is executed or a position where the drilling process is executed. The position where the drilling process is executed may be the position where the tank is rotated by the index table and retracted, or the tank is moved by the roller conveyor and retracted to create a space below the drilling position. This is because it is possible to make a structure such as introducing shoots, dropping scraps and discharging.

  The synthetic resin tank drilling device of the present invention may further include the following configuration.

  (2A) A horizontal movement device for moving the composite blade in the horizontal direction is also provided, and the control device drives and controls the horizontal movement device in addition to the blade lifting device, the blade rotation device, and the scrap processing device. To be configured.

  (4A) When the cutting edge of the cutting blade penetrates the tank, the control device stops the lowering operation of the composite blade and raises the composite blade to a position where it can be extracted from the tank, and moves it horizontally. A process for driving and controlling the blade lifting device, the horizontal movement device, and the scrap processing device is executed so as to execute a scrap discharging operation for driving the scrap processing device at the discharge position to discharge scrap caught on the composite blade. It is structured like

  As described above, the scrap discharge position can be set near the hole drilling position, but in that case, the scrap discharge processing cannot be executed unless after the tank is retracted. On the other hand, by providing (2A) and (4A) as well, the operation for scrap discharge processing after the composite blade is extracted from the tank can be executed independently of the tank retracting operation. There is an advantage of becoming. In the middle of the process of (4A), it is preferable to stop the rotation of the blade by the blade rotation device when the composite blade is extracted from the tank.

  The synthetic resin tank drilling device of the present invention can further include the following configuration.

  (11) The scrap processing apparatus includes an actuator that is positioned inside the composite blade and that can cause the rod to appear and disappear.

  (12) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the actuator to protrude to the maximum protruding position at the predetermined discharging position, and then the rod is moved to the immersion position with respect to the actuator. It is configured to output a command to return.

  With such a configuration, scrap can be easily discharged by the protruding operation of a rod of an actuator (solenoid, air cylinder, hydraulic cylinder, ball screw mechanism, etc.).

  Further, the synthetic resin tank drilling device of the present invention can further include the following configuration.

(21) The scrap processing device is located inside the composite blade, and includes a lid at the tip of the rod, and the bottom surface of the lid is slightly smaller than the cutting edge of the cutting blade , except for the maximum projecting position. It must have an air cylinder that can take an intermediate projecting position that is located below .

  (22) The control device is configured to execute control to move the rod of the air cylinder to the intermediate protruding position at least before the cutting operation by the cutting blade is started.

(23) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the air cylinder to protrude to the maximum protruding position at the predetermined discharging position, and then immerses the rod into the air cylinder. It is configured to output a command to return to the position.
(24) The lid is sized and shaped so as to close the air blowing hole of the tank to be drilled, and the lower surface of the lid is positioned slightly below the cutting edge of the cutting blade by the air cylinder. It should be constructed so that it can take such an intermediate protruding position.

By providing such a configuration, it is possible to perform drilling in a state where an air blowing hole in the case of manufacturing a tank by blow molding is closed with a lid at the tip of a rod of an air cylinder. Therefore, when the air blowing hole is cut out to form a circular hole in the tank, the cutting waste does not fall into the tank from the air blowing hole. At this time, “(24) The lid body has a size and shape that can close the air blowing hole of the tank to be drilled, and the lower surface of the lid body is slightly smaller than the cutting edge of the cutting blade by the air cylinder. It is also configured to be able to have an intermediate protruding position that is positioned below . By adopting an air cylinder, an actuator as a scrap processing device also acts as an air spring, and the lid is pushed back so as to be immersed in the blade as the blade is lowered. At this time, pressure is applied in the vicinity of the air blowing hole, but it is a pressing force to the inside of the hole that is drilled and a pressure that keeps the balance by the action of the air spring. There is no risk of such deformation of the tank.

  Moreover, the synthetic resin tank drilling device of the present invention can further include the following configuration.

(31) As the scrap processing apparatus, a scrap rotation prevention claw that is located inside the composite cutter, is formed at the tip of the rod, and is inserted into the scrap at a position outside the rotation center of the composite cutter. It must have a direct acting actuator.

  (32) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the actuator to protrude to the maximum protruding position at the predetermined discharging position, and reversely rotates the composite blade by the blade rotating device. Later, it is configured to output a command for returning the rod to the immersive position to the actuator.

  By providing such a configuration, even when the scrap is firmly held inside the cutting blade, the screw can be loosened by rotating the composite cutter in a state where the scrap is prevented from rotating by the claw. The scrap can be reliably discharged by the same action.

  According to the present invention, it is possible not only to prevent chips and the like from remaining, but also to prevent breakage of the blade and deformation of the tank, and to perform a circular hole processing on the synthetic resin tank.

1 shows a drilling device of Example 1, (A) is a conceptual diagram of a configuration, (B) is an exploded perspective view of a composite blade, and (C) is a schematic diagram showing a configuration of a blade rotating device. It is the expanded view and sectional drawing of a cutter with which the apparatus of Example 1 is mounted | worn. 3 is a flowchart illustrating the contents of control processing of the apparatus according to the first embodiment. FIG. 3 is an image diagram illustrating an operation of the apparatus according to the first embodiment. FIG. 3 is an image diagram illustrating an operation of the apparatus according to the first embodiment. It is a schematic diagram which shows the structure of the blade rotation apparatus of the drilling apparatus of Example 2. FIG. 10 is a flowchart illustrating the contents of control processing of the apparatus according to the second embodiment. FIG. 6 is an image diagram illustrating an operation of the apparatus according to the second embodiment. FIG. 3 is an image diagram illustrating an operation of the apparatus according to the first embodiment. The drilling apparatus of Example 3 is shown, (A) is a conceptual diagram of a structure, (B) is a disassembled perspective view of a composite blade, (C) is a schematic diagram which shows the structure of a cutter rotating apparatus. 12 is a flowchart illustrating the contents of control processing of the apparatus according to the third embodiment. FIG. 10 is an image diagram illustrating an operation of the apparatus according to the third embodiment. FIG. 10 is an image diagram illustrating an operation of the apparatus according to the third embodiment. It is a front view which shows the shape of the scrap cut out by the apparatus of Example 3. FIG. It is a schematic diagram which shows a prior art and its problem.

  Hereinafter, an embodiment will be described with respect to a drilling device for opening a circular hole in a synthetic resin tank, which includes all of the above-described configurations (1) to (4).

  As shown in FIG. 1A, a tank drilling device 1 according to the first embodiment includes a composite blade 10, a blade lifting device 20 that lifts and lowers the entire composite blade 10, and a blade that rotates the entire composite blade 10. Rotating device 30, horizontal moving device 40 for moving the entire device in the horizontal direction, scrap processing device 50 for processing scrap to be cut, blade lifting device 20, blade rotating device 30, horizontal moving device 40 and scrap The control device 60 is configured to drive and control the processing device 50.

  As shown in FIG. 1 (B), the composite blade 10 is composed of a tearing blade 11 that is cylindrical and has a sharp edge at the lower end, and an outer-shaped cutting blade 12 that fits inside the tearing blade 11. Is done. The cutting edge 11 a of the tearing blade 11 protrudes beyond the cutting edge 12 a of the cutting blade 12. Therefore, when it is lowered by the blade lifting device 20, the cutting edge 11a of the tearing blade 11 contacts the resin tank T and bites into it.

  In the present embodiment, the cutting edge 11a is provided with two protruding portions 11b protruding in the arc shape in the circumferential direction by 2 mm. Moreover, this protrusion part 11b is a part which acts as a tearing blade, and the tearing blade 11 and the cutting blade 12 are fitted in a relationship in which the tip of the cutting edge 11b protrudes 2 mm from the cutting edge 12a of the cutting blade 12. This is because the present embodiment is designed for drilling a resin tank T having a thickness of 6 mm. The protrusion amount of the cutting edge 11b of the tearing blade 11 is not limited to 2 mm. However, it is desirable that the amount of protrusion is equal to or less than ½ of the thickness of the resin tank T so that it does not cause pressure deformation to the resin tank T. The cutting blade 11 and the cutting blade 12 may be coupled not only by a fitting method such as shrink fitting, but also by a coupling method such as screwing or brazing.

  The cutting edges 12a of the cutting blade 12 are formed in two locations with a positional relationship shifted by 180 degrees in the circumferential direction, as shown in the developed and sectional views in FIGS. And it has a cross-sectional shape in which the scrap S can be hooked by a method such as tapering the entire inner surface of the cutting blade 12 or attaching a projection only to the inside of the blade edge 12a.

  In the present embodiment, as the blade rotating device 30, as shown in FIG. 1C, the rotational force of the drive gear 32 rotated by the motor 31 is transmitted to the composite blade 10 by rotating the transmission gear 33. A mechanism in which the gear 33 is externally fitted to the composite blade 10 is employed and is designed to be compact. The transmission gear 33 may be externally fitted to a shaft that rotatably supports the composite blade 10 instead of the composite blade 10. Further, not limited to gear drive, a system such as chain drive or belt drive may be adopted.

  In the present embodiment, as the scrap processing device 50, a scrap discharge air cylinder 51 is provided at a position where the rod 52 can protrude and immerse on the central axis of the composite blade 10.

  The blade lifting device 20 may have a structure for lifting the composite blade 10 together with the blade rotating device 30. The horizontal movement device 40 may be configured to move the entire drive unit including the composite blade 10, the blade lifting device 20, and the blade rotation device 30 in the horizontal direction.

  Next, the contents of the control process executed by the control device 60 will be described. When the drilling operation start is instructed, the control device 60 first drives the blade rotating device 30 to rotate the composite blade 10 at a steady speed as shown in the flowchart of FIG. The device 20 is driven and controlled to lower the composite blade 10 (S20). When the composite blade 10 descends and the cutting edge 11a of the tearing blade 11 approaches the surface of the resin tank T (S30: YES), the descending speed is switched from high speed to low speed (S40).

  Then, when the cutting edge 11a of the tearing blade 11 penetrates the resin tank T (S60: YES), the blade lifting device 20 is switched to the state of high-speed raising control (S70). Next, the rotation of the blade by the blade rotation device 30 is stopped (S80). When the composite blade 10 is raised to a predetermined position (S100: YES), the ascent operation is stopped (S110), and the horizontal movement device 40 is driven to move the composite blade 10 horizontally to a predetermined position (cut piece discharge position). The operation is stopped (S120 to S140), and a protruding command is output to the scrap discharge air cylinder 51 to discharge the cut piece (S150). Thereafter, a return command is output to the scrap discharge air cylinder 51 to return the rod 52 to the original immersion state (S160). Then, the horizontal moving device 40 is driven in the reverse direction to return the composite blade 10 to the original position (S170, S180). When the composite blade 10 returns to the original position (S180: YES), the horizontal movement device 40 is stopped (S190), it is determined whether or not work completion is commanded (S200), and work completion is not commanded. If this is the case (S200: NO), it is determined whether or not the next tank is set (S210). If the next tank is set (S210: YES), the operations from S10 are repeated.

  Here, in the process of S30, it is possible to determine whether or not the vehicle has approached by an appropriate method such as the elapsed time jsj after the descent start and the measurement of the descent distance. The determination of S60 is made from a method of detecting by a stress sensor or the like that the reaction force applied to the support shaft of the composite blade 10 has become a predetermined value or less, a method of determining by the lowered position of the support shaft of the composite blade 10, and a determination from the descending speed. A method etc. can be adopted. The determination of S100, S130, and S180 can be detected by a limit switch or the like, or can be determined based on a moving distance. S200 may be determined based on the setting state of the command signal, and S210 may be determined using an optical sensor or the like.

  By the above control process, as shown in FIGS. 4 and 5, the chips L are confined inside the composite blade 10, and the scrap S is mainly cut while being held so as to be caught inside the cutting blade 12. The cutting operation is performed, and after the penetration, the scrap S and the cutting waste L rise while being held inside the composite blade 10, and the scrap S and the cutting waste L can be discharged without dropping into the tank.

  According to the present embodiment, the cutting blade 12 is fitted into the tearing blade 11, the material is cut with the tearing blade 11, and the inside is sealed at the same time, and the cutting with the cutting blade 12 is performed on the inside to remove the material. . Since the protrusion or taper for hooking the scrap S is provided on the inner side, the scrap S is hooked and held even after penetrating, and the cutting waste L is confined inside the composite blade 10 while maintaining a sealed state. Further, except for the cutting edge 11 except for the first biting and the last penetration, the cutting operation naturally proceeds with the progress of the cutting of the cutting blade 12, so that the cutting edge 11a is not easily broken, and the synthetic resin. A large pressing load is not applied to the tank T made of metal. Therefore, according to the present embodiment, not only residue of chips and the like can be prevented, but also breakage of the blade and deformation of the tank can be prevented.

  As shown in FIG. 6, the tank drilling device 1 of Example 2 is a device suitable for cutting out a circular hole in the air blowing hole BH at the time of blow molding. Although the structure is the same as that of the first embodiment, the tip of the rod 52 of the scrap discharge air cylinder 51 is provided with a cover 53 having a size capable of closing the air blowing hole B, and the scrap discharge air cylinder. In 51, the internal pressure can be controlled in multiple stages so that the rod is in the intermediate protruding state and the maximum protruding state.

  Further, there is a slight difference in the contents of the control processing executed by the control device 60. When the drilling operation start is instructed, the control device 60 first outputs a command for causing the rod 52 to be in an intermediate projecting state to the air cylinder 51 as shown in the flowchart of FIG. 7 (S5). . The intermediate projecting state is a projecting state in which the lower surface of the lid 53 is positioned slightly below the cutting edge 12a of the cutting blade 12. Thereafter, the same procedure as in the first embodiment is executed. Note that the cylinder rod protrusion command in S150 is a command to the maximum protrusion state.

  In the intermediate projecting state according to the command of S5 of Example 2, the lid 53 closes the air blowing hole BH at the time of blow molding before the cutting blade 12 comes into contact with the surface of the resin tank T and starts cutting, thereby cutting chips. L is prevented from spilling into the tank, and the air cylinder itself acts as an air spring as the cutting blade 12 is lowered, so that the rod 52 is pushed back while the air blowing hole BH is closed by the lid 53. It is. Note that the air cylinder internal pressure in the intermediate protruding state is set to a weak value so that the tank does not deform.

  By the above control process, as shown in FIGS. 8 and 9, the chips L are confined inside the composite blade 10 in a state where the air blowing holes BH are blocked, and the scrap S is caught inside the cutting blade 12. In this way, a cutting operation mainly for cutting is performed while being held, and after penetration, the scrap S and the cutting waste L rise while being held inside the composite blade 10, and the scrap S and the cutting waste L are put into the tank. It can be discharged without dropping.

  Also in the present embodiment, the cutting blade 12 is fitted into the tearing blade 11, the material is cut with the tearing blade 11, and the inside is sealed at the same time, and the cutting with the cutting blade 12 is performed on the inside to remove the material. Since the protrusion or taper for hooking the scrap S is provided on the inner side, the scrap S is hooked and held even after penetrating, and the cutting waste L is confined inside the composite blade 10 while maintaining a sealed state. Further, except for the cutting edge 11 except for the first biting and the last penetration, the cutting operation naturally proceeds with the progress of the cutting of the cutting blade 12, so that the cutting edge 11a is not easily broken, and the synthetic resin. A large pressing load is not applied to the tank T made of metal. Therefore, according to the present embodiment, not only residue of chips and the like can be prevented, but also breakage of the blade and deformation of the tank can be prevented.

  As shown in FIGS. 10A to 10C, the tank drilling device 1 of the third embodiment has substantially the same structure as that of the first embodiment. The difference in structure is that a scrap rotation prevention claw 55 provided at the tip of a horizontal arm extending in the direction is provided.

  Further, the content of the control process executed by the control device 60 is substantially the same as that of the first embodiment, but there is a difference in the final scrap discharging operation. This point will be described with reference to FIG. Operation until the horizontal movement device 40 is driven for scrap discharge, the composite blade 10 is horizontally moved to a predetermined position (cut piece discharge position) and stopped, and a projection command is output to the scrap discharge air cylinder 51 (S10). ~ S150) are the same. However, the main purpose of the protrusion command in S150 is to cause the scrap rotation preventing claw 55 to bite into the scrap S. Then, after the operation of S150, the motor 31 is commanded to rotate in the direction opposite to that at the time of drilling (S155). Thereby, the scrap S comes out from the inside of the cutting blade 12 and is discharged in the manner of reversing the screw. Subsequent operations are the same as those in the first embodiment.

  With the above control processing, as shown in FIGS. 12 and 13, the chips L are confined inside the composite blade 10, and the scrap S is mainly cut while being held so as to be caught inside the cutting blade 12. The cutting operation is performed, and after the penetration, the scrap S and the cutting waste L rise while being held inside the composite blade 10, and the scrap S and the cutting waste L can be discharged without dropping into the tank.

  According to the present embodiment, as shown in FIG. 14, the scrap when the scrap holding ability is enhanced by forming the blade projecting inward on the outer surface of the scrap S so as to cut the thread groove on the inner surface of the cutting blade 12. The effect of accurately performing the discharge is demonstrated. Other effects are the same as those of the first embodiment.

  As mentioned above, although the Example of this invention was described, it cannot be overemphasized that various deformation | transformation implementation in the range which does not deviate from the summary is not restricted to this Example and this invention is possible.

  For example, as the cutting blade of the composite blade, a cutting blade that does not have a cylindrical body may be integrated with the inner surface of the cutting blade by screwing or brazing. Alternatively, a plurality of such composite blades may be prepared with different diameters and replaced with an auto tool changer.

  It can be used as a device for processing a circular hole for a fuel tank made of a synthetic resin for automobiles, motorcycles, small ships and the like.

DESCRIPTION OF SYMBOLS 1 ... Tank drilling device 10 ... Compound blade 11 ... Ripping blade 11a ... Cutting edge of cutting blade 12 ... Cutting blade 12a ... Cutting blade edge 20 ... Cutter lifting / lowering device 30 ..Cutter rotation device 31 ... Motor 32 ... Drive gear 33 ... Transmission gear 40 ... Scrap processing device 50 ... Horizontal movement device 51 ... Scrap discharge air cylinder 52 ... Rod 53 ... Lid 55 ... Scrap rotation prevention claw 60 ... Control device BH ... Air blowing hole L ... Cutting waste S ... Scrap T ... Resin tank

Claims (5)

A drilling device for a synthetic resin tank, which is a drilling device for opening a circular hole in a synthetic resin tank and has the following configuration.
(1) A cutting blade that is cylindrical and has a sharp cutting edge at the lower end, and a cutting blade that is disposed inside the cutting blade, and the angle between the rake face and the flank face is set to a positive acute angle. It has a cutting edge with a shape to scoop resin, and it is composed of a cutting blade with a projection or taper that hooks scrap inside, so that the cutting edge of the tearing blade protrudes beyond the cutting edge of the cutting blade It has an integrated composite blade.
(2) A blade lifting device that lifts and lowers the composite blade, a blade rotating device that rotates the composite blade, a scrap processing device that processes scrap caught in the composite blade, the blade lifting device, and a blade rotating device. And a control device for driving and controlling the scrap processing device.
(3) The control device raises the blade rotation device and the blade rotation device so that the composite blade and the tank are brought into contact with each other after the rotation number of the blade rotation device is increased to a predetermined rotation number, and cutting is started. It is configured to execute processing to control the drive.
(4) When the cutting edge of the tearing blade penetrates the tank, the control device stops the lowering operation of the composite blade and removes the composite blade from the tank, and the scrap processing device is placed at a predetermined discharge position. It is comprised so that the process which drives and controls the said blade raising / lowering apparatus and scrap processing apparatus may be performed so that the scrap discharge operation | movement which drives and discharges the scrap stuck on the composite blade may be performed. The synthetic resin tank drilling device according to claim 1, further comprising the following configuration.
(2A) A horizontal movement device for moving the composite blade in the horizontal direction is also provided, and the control device drives and controls the horizontal movement device in addition to the blade lifting device, the blade rotation device, and the scrap processing device. To be configured.
(4A) When the cutting edge of the cutting blade penetrates the tank, the control device stops the lowering operation of the composite blade and raises the composite blade to a position where it can be extracted from the tank, and moves it horizontally. A process for driving and controlling the blade lifting device, the horizontal movement device, and the scrap processing device is executed so as to execute a scrap discharging operation for driving the scrap processing device at the discharge position to discharge scrap caught on the composite blade. It is structured like The synthetic resin tank drilling device according to claim 1 or 2, further comprising the following configuration.
(11) The scrap processing apparatus includes an actuator that is positioned inside the composite blade and that can cause the rod to appear and disappear.
(12) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the actuator to protrude to the maximum protruding position at the predetermined discharging position, and then the rod is moved to the immersion position with respect to the actuator. It is configured to output a command to return. The synthetic resin tank drilling device according to claim 1 or 2, further comprising the following configuration.
(21) The scrap processing device is located inside the composite blade, and includes a lid at the tip of the rod, and the bottom surface of the lid is slightly smaller than the cutting edge of the cutting blade, except for the maximum projecting position. It must have an air cylinder that can take an intermediate projecting position that is located below.
(22) The control device is configured to execute control to move the rod of the air cylinder to the intermediate protruding position at least before the cutting operation by the cutting blade is started.
(23) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the air cylinder to protrude to the maximum protruding position at the predetermined discharging position, and then immerses the rod into the air cylinder. It is configured to output a command to return to the position.
(24) The lid is sized and shaped so as to close the air blowing hole of the tank to be drilled, and the lower surface of the lid is positioned slightly below the cutting edge of the cutting blade by the air cylinder. It should be constructed so that it can take such an intermediate protruding position. The synthetic resin tank drilling device according to claim 1 or 2, further comprising the following configuration.
(31) As the scrap processing apparatus, a scrap rotation prevention claw that is located inside the composite cutter, is formed at the tip of the rod, and is inserted into the scrap at a position outside the rotation center of the composite cutter. It must have a direct acting actuator.
(32) At the time of the scrap discharging operation, the control device outputs a command for causing the rod of the actuator to protrude to the maximum protruding position at the predetermined discharging position, and reversely rotates the composite blade by the blade rotating device. Later, it is configured to output a command for returning the rod to the immersive position to the actuator.