JP2012011491A - Drill/tap working device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drill/tap working device facilitating quick exchange of a tool such as a drill or a tap and capable of preventing breakage of the tool during working.SOLUTION: The tool unit 3 includes a tool holder 21 in which a hollow hole 21a is formed, and a collet holder 23 in which a tool 22 is integrally arranged in advance is inserted the tool holder 21. The structure of tool holder 21 and the collet holder 23 allows rotation transmission. The collet holder 23 is held in the tool holder 21 by fitting a steel ball 24 into a groove 23b. The top end side in the insertion direction from the groove 23b of the collet holder 23 is structured so that it has a diameter along the hollow hole 21a of the tool holder 21. When the collet holder 23 is inserted into the tool holder 21 to perform a mounting operation, the steel ball 24 may be pushed out to an outer circumferential direction of the tool holder 21.

Description

  The present invention relates to a drill / tapping device for drilling or internally threading a workpiece.

  Conventionally, when drilling or threading a workpiece, breakage of a drill or a tap that is a tool has been a problem. For such a problem, a hole drilling method and apparatus shown in Patent Document 1 have been proposed. Yes.

  In the drilling method and apparatus of Patent Document 1, a spindle motor that rotates a drill is supported by a restoring element such as an electromagnet and a damping element such as an actuator, and the spindle motor is in an X, Y, Z orthogonal coordinate system ( It is configured such that it can be displaced in a three-dimensional space. At the stage where the drill comes into contact with the workpiece surface, the support force by the restoring element and the damping element is weakened, and the reaction force when the drill comes into contact with the workpiece is absorbed by the displacement of the spindle motor, while suppressing the vibration of the spindle motor. To prevent breakage. Thereafter, when the contact pressure increases to such an extent that the drill can cut the workpiece, the support force of the spindle motor is instantaneously increased to prevent the shaft from swinging.

  In general, a drill chuck shown in Non-Patent Document 1 is used for holding a drill in the above-described apparatus or the like. This drill chuck is configured to open and close three claws by inserting a drill chuck handle into the main body and turning it, so that a desired drill is sandwiched by the claws.

JP-A-6-71509

Japanese Industrial Standards JIS B4634: 1998

  According to the above conventional drilling method and apparatus, not only drilling with a drill but also threading for exchanging a drill with a tap can be performed, but when exchanging a tool such as a drill or a tap. However, it is necessary to mount the drill chuck handle on the drill chuck to open and close the claw, and there is a problem that it takes time to change the tool. In the case of a small-diameter tool, when it is held by a drill chuck, it is often not evenly clamped between the three claws. When drilling or female threading is performed as it is, the tool rotates eccentrically. There were also problems such as the occurrence of defects that could easily break when contacted with the workpiece. Furthermore, the drill chuck has a structure that increases in weight and radial dimensions and tends to increase rotational inertia during processing. For this reason, when a rotational load is applied to the tool during machining, the torsional moment that acts on the tool from the drill chuck increases, and there is a problem that the tool is easily broken especially in a small-diameter tool. .

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drill / tapping device capable of easily and quickly changing a tool and preventing breakage of the tool during processing. . In order to achieve this object, the present invention comprises a first beam that can swivel in a horizontal plane, and a parallel link that is pivotally connected to the first beam in a horizontal plane and that can swivel in a vertical plane. A drill / tapping apparatus having a second beam and a tool unit supported by the second beam, wherein the tool unit is a hollow shaft-shaped tool holder that is rotated by being driven by a rotational drive source. And a shaft-shaped collet holder that is pre-arranged with the tool and inserted into the tool holder. The tool holder is formed with a hollow hole along its axis and can project into the hollow hole. In addition to arranging a steel ball and providing a drive transmission hole portion in which a part of the wall surface of the hollow hole is formed in one or a plurality of planes, the collet holder has a drive that can be fitted in the drive transmission hole portion. Transmission shaft When the collet holder is inserted into the tool holder until the drive transmission shaft portion is fitted to the drive transmission hole portion, a groove arranged at a position where the steel ball can be fitted extends in the circumferential direction. Further, the diameter of the front end side in the insertion direction from the groove to the tool holder is a diameter along the hollow hole over a predetermined length.

  In addition, it is preferable that the length of the diameter part along the hollow hole of the tool holder in the said collet holder is more than the fitting depth of a drive transmission shaft part and a drive transmission hole part.

  According to the drill and tap processing device of the present invention, the steel ball provided so as to always protrude into the hollow hole of the tool holder is fitted into the groove of the collet holder in which the tool is integrally arranged, thereby arranging the tool in the tool holder. can do. At that time, until the drive transmission shaft portion of the collet holder is fitted and fitted into the drive transmission hole portion of the tool holder, the steel ball is pushed toward the outer periphery of the tool holder on the outer peripheral surface of the collet holder, and the drive transmission shaft portion is When mating with the drive transmission hole, the steel ball fits into the groove. For these reasons, the tool can be changed very easily and quickly with one hand. In addition, the tool is preliminarily disposed on the collet holder, and the collet holder is provided with a diameter portion and a drive transmission shaft portion that respectively match the hollow hole and the drive transmission hole portion of the tool holder. It can be reliably arranged on the axis of the tool unit, and there is an effect that breakage due to eccentric rotation of the tool during machining can be prevented. Furthermore, since the collet holder is supported by the steel ball, the structure is simpler and lighter than the drill chuck, and the radial dimension can be reduced. Therefore, there is an effect that the inertia at the time of rotation can be reduced, and breakage of the tool due to a torsional moment or the like when a rotational load is applied to the tool can be prevented.

1 is a perspective view of a drill / tapping apparatus according to the present invention. 1 is a front view of a drill / tapping apparatus according to the present invention. 1 is a plan view of a drill / tapping apparatus according to the present invention. FIG. 4 is an enlarged partially cutaway cross-sectional view taken along line B-B in FIG. 3, showing a state in which the second beam has turned downward to the bottom dead center. FIG. 4 is an enlarged partially cutaway cross-sectional view taken along line BB in FIG. 3, showing a state in which the second beam is pushed up by the lifter and pivoted upward. It is a perspective explanatory view of a drill and tap processing device according to the present invention. FIG. 3 is an enlarged partially cutaway cross-sectional view taken along line AA in FIG. 2. It is a principal part expansion partial notch sectional view which shows the state of the spring connection member at the time of hole processing. It is a principal part expansion partial notch sectional view which shows the state of the spring connection member at the time of female thread cutting.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In FIG. 1 to FIG. 9, reference numeral 1 denotes a drill / tapping device, which comprises a balance arm 2 and a tool unit 3 connected to the balance arm 2. The balance arm 2 has a support column 4 that is erected and fixed on a sufficiently strong base, frame or the like (not shown), and a beam holder 5 is fixed to the support column 4. The beam holder 5 is configured to be position-adjustable along the column 4. A rotating shaft 6 extends vertically and is rotatably attached to the beam holder 5, and a first beam 7 extending horizontally is integrally connected to the rotating shaft 6. Thereby, the 1st beam 7 is comprised so that turning in the arrow Y1 direction of FIG. 3, ie, the horizontal surface, is possible. Further, a second beam 9 is connected to the tip of the first beam 7 via a rotation shaft 8 extending vertically upward, and this second beam 9 has the rotation shaft 8 as a fulcrum in the direction of arrow Y2 in FIG. That is, it is configured to be rotatable in a horizontal plane.

  The second beam 9 includes an elbow 9a fitted and supported on the rotary shaft 8, and two links 9b and 9c that are pivotally supported by the elbow 9a so as to be rotatable in a vertical plane, and are arranged in parallel. Each of the links 9b and 9c is composed of a tool holder 9d that pivotally supports the ends of the links 9b and 9c in a vertical plane. With this structure, the second beam 9 forms a parallel link. As shown in FIGS. 4 and 5, the link 9b and the link 9c are relatively relative to each other, and the tool holder 9d is parallel to the elbow 9a. It is configured to be able to turn in a vertical plane while maintaining.

  A plate-like stopper plate 10 is adjacent to the links 9b and 9c and is fixed to the elbow 9a so as to extend in parallel therewith. A stopper block 11 is fixed to the lower end of the stopper plate 10, and a stopper bolt 12 is screwed to the stopper block 11 below the tool holder 9d. As shown in FIG. 4, the second beam 9 can be swung downward until it abuts against the stopper bolt 12, and the second beam 9 is adjusted by turning the stopper bolt 12 to adjust its protruding amount. Nine bottom dead centers can be set arbitrarily. A hollow hole 12a is formed through the stopper bolt 12 along its axis, and a lifter 13 is press-fitted and fixed therein. The lifter 13 is a cable release for operating a camera shutter, and is configured such that a pin 13a at the tip protrudes when a release button (not shown) is operated. By the protruding operation of the pin 13a of the lifter 13, the second beam 9 can be turned upward in the vertical plane as shown in FIG. 5 shows a state in which the second beam 9 is pushed up by the lifter 13. However, if the tool unit 3 is held and operated by hand, the second beam 9 can be swung further upward.

  As shown in FIG. 6, the stopper plate 10 is provided with a spring connecting member 14 extending vertically, and tension springs 15a and 15b are connected to both ends of the spring connecting member 14, respectively. The tension springs 15a and 15b are connected to the links 9b and 9c, respectively. The tension spring 15a can be urged to turn the second beam 9 upward by the tension force, and the tension spring 15b The pulling force can bias the second beam 9 to turn downward. The spring connecting member 14 is disposed so as to be fitted in a groove 16 a of the adjustment plate 16 fixed to the stopper plate 10, and is always fixed between the stopper plate 10 and the adjustment plate 16. One of the screws for fixing the adjusting plate 16 to the stopper plate 10 is a butterfly bolt 17. By loosening the butterfly bolt 17, the spring connecting member 14 can move in the vertical direction along the groove 16a. It is configured. Accordingly, the spring connecting member 14 is positioned and fixed at an arbitrary position in the vertical direction, and the tensile force applied to the second beam 9 by the tension springs 15a and 15b can be adjusted.

  The tension spring 15a obtains a thrust load (axial load acting on the tool 22) to be applied to the tool 22 described later when female threading is performed with the spring connecting member 14 moved to the upper limit position and fixed. The performance that can be obtained is adopted. In the female threading process, the tap that becomes the tool 22 bites the workpiece and advances while cutting the female thread, and that the tap needs to be reversed approximately once every 2-3 revolutions in the female threading direction. Therefore, the thrust load applied to the tool 22 may be small. Otherwise, especially when reversing the tap, the tap does not return along the screw so that it can be cut by then, and it may bite into the workpiece. Accordingly, the tension spring 15a is configured to appropriately reduce the thrust load due to the weight of the tool unit 3 at the upper limit position of the spring coupling member 14. Further, the tension spring 15b has a performance capable of obtaining a thrust load to be applied to the tool 22 described later when drilling in a state where the spring connecting member 14 is moved and fixed to the lower limit position. . In the drilling, unless the drill serving as the tool 22 is pressed against the workpiece with a corresponding thrust load, the drill escapes from the drilling position in the initial stage or easily breaks due to the impact of cutting resistance during drilling. Accordingly, the tension spring 15b is configured so that an appropriate thrust load can be added to the thrust load due to the weight of the tool unit 3 at the lower limit position of the spring connecting member 14.

  On the other hand, the tool unit 3 has a motor mount 18 attached integrally with the tool holder 9d. As shown in FIG. 7, the motor mount 18 has an AC servo motor 19 (hereinafter referred to as an example of a rotational drive source). The motor 19 is simply fixed. The motor 19 is provided with an encoder 19b. The encoder 19b is configured to generate a signal corresponding to the number of rotations of the drive shaft 19a of the motor 19. The encoder 19b is connected to a controller (not shown) for motor drive control.

  A hollow shaft-shaped tool holder 21 is coupled to the drive shaft 19a of the motor 19 via a coupling 20 so as to be integrally rotatable. The tool holder 21 is concentrically formed with a bottomed hollow hole 21a. In this hollow hole 21a, a shaft 22 in which a tool 22 such as a drill for drilling holes or a tap for female thread cutting is held in advance is integrated. A shaped collet holder 23 is inserted. Further, the bottom side wall surface of the hollow hole 21a is configured as a drive transmission hole 21b having two opposing flat surfaces, and the end of the collet holder 23 is fitted and fitted into the drive transmission hole 21b. The drive transmission shaft portion 23a is chamfered.

  The collet holder 23 is prevented from coming off by a steel ball 24 arranged at the tip of the tool holder 21 so as to always protrude into the hollow hole 21a. That is, the collet holder 23 is formed with an annular groove 23b in the circumferential direction, and the steel ball 24 is fitted therein. The steel ball 24 is prevented from coming off by a cylindrical collar 25 slidably provided along the outer periphery of the tool holder 21. The collar 25 is always urged toward the tip end side of the tool holder 21 by the spring 26 and is always in contact with the retaining ring 27, thereby normally blocking the outward movement path of the steel ball 24, and the steel ball 24. Is inoperable in a state of protruding into the hollow hole 21a. Further, the diameter of the collet holder 23 on the back side of the groove 23b, that is, the distal end side in the insertion direction of the tool holder 21 into the hollow hole 21a is a guide portion 23c having a diameter along the hollow hole 21a over a predetermined length. It is configured. It is preferable that the length of the guide portion 23c is at least as large as the fitting depth between the drive transmission hole portion 21b and the drive transmission shaft portion 23a. In this example, a sufficiently long length is secured. ing.

  The tool unit 3 configured as described above has a configuration in which the motor 19 to the tool 22 are arranged on a coaxial line, and the posture of the tool 22 is always perpendicular to the axis by the action of the parallel link of the second beam 9, that is, the axis of the tool 22. The tool holder 9d is connected in a vertical orientation. For this reason, by the vertical turning of the second beam 9 of the balance arm 2, the balance arm 2 can move up and down while maintaining the vertical axis.

  The drill / tapping device 1 performs a vertical hole drilling or female threading on a workpiece as can be seen from the posture of the tool unit 3 held by the balance arm 2. As a first working example, an example of drilling is shown below.

  When drilling a hole in the workpiece W, the collar 25 is slid upward against the bias of the spring 26, and a collet holder 23 having a drill is inserted as a tool 22 into the tool holder 21. At this time, since the collet holder 23 is provided with a guide portion 23c having a diameter along the hollow hole 21a of the tool holder 21, from the beginning when the collet holder 23 is inserted into the tool holder 21, the steel ball 24 is inserted into the tool holder 21 by the guide portion 23c. It is pushed in the direction protruding from the outer periphery. Therefore, even if the collar 25 is not always pushed up by hand, the collar 25 is blocked by the steel ball 24 and cannot return to the original position. In this state, since the steel ball 24 is also pushed to the collet holder 23 side by the collar 25, the drive transmission shaft portion 23a is fitted to the drive transmission hole portion 21b and the groove of the collet holder 23 is positioned at the steel ball 24 position. When 23b is arranged, it automatically fits here. At the same time, the collar 25 returns to the position where the outer side of the steel ball 24 is closed, so that the collet holder 23 is prevented from coming off. After inserting the collet holder 23 into the tool holder 21 in this way, the collet holder 23 can be mounted and held on the tool holder 21 by one-hand operation. In addition, since the collet holder 23 can be attached and detached simply by pushing up the collar 25, even when a tap is used as the tool 22 as will be described later, the replacement is very easy.

  Further, when drilling, as shown in FIG. 8, the spring connecting member 14 is slid and fixed to the lower limit position. As a result, the lower tension spring 15b urges the link 9c to be pulled down, and at the time of machining, in addition to the thrust load due to the weight of the tool unit 3 or the like, a thrust load due to the force of the tension spring 15b is applied to the tool 22, 22 can be pressed against the workpiece W. In this state, the tool unit 3 is operated to place the tip of the tool 22 at the hole machining position of the workpiece W. At this time, the first beam 7 and the second beam 9 are set in a horizontal turning state in which the angle θ in plan view is about 90 °, and the links 9b and 9c of the second beam 9 extend substantially in the horizontal direction. Is set as follows.

  Thus, when the start switch (not shown) of the tool unit 3 is turned on and the motor 19 is driven, the tool holder 21 to the tool 22 (drill) rotate via the coupling 20. At this time, since a thrust load is applied to the tool 22 by its own weight such as the tool unit 3 and the force of the tension spring 15b, the tool 22 punches the workpiece W by rotation. During the drilling, the tool unit 3 and the balance arm 2 are placed in a free state. That is, the operator does not grip the tool unit 3 or restrict the movement of the balance arm 2.

  During drilling, a complex drag acts on the tool 22 due to various factors such as the biting of chips, the shape of the tool 22 itself, the composition of the workpiece W, the torque ripple inherent to the motor 19 and the like. When such a drag force acts, the balance arm 2 receives this and performs a fine turning operation in the horizontal and vertical directions to finely adjust the position of the tool unit 3. As a result, the tool 22 is always automatically aligned to an optimum state without resisting the drag and punches the workpiece W. Further, the second beam is set to be substantially horizontal with respect to the descent of the tool unit 3 as the tool 22 drills into the workpiece W and the fine movement in the axial direction of the tool unit 3 due to the aforementioned drag. The tool 22 can be aligned by horizontally turning the first beam 7 and the second beam 9 with a slight force.

  Further, the ratio of the rotational load in the drag acting on the tool 22 is large, and the fluctuation during machining is fine and complicated. This rotational load is transmitted to the balance arm 2 as a rotational reaction force of the tool unit 3. At this time, since the balance arm 2 is set so that the first beam 7 and the second beam 9 form about 90 ° in plan view, this rotational reaction force is received by the first beam 7 at a pressure angle of 0 °. It becomes possible. As a result, the rotational movement of the first and second beams 7 and 9 due to the rotational reaction force, that is, the rotational load acting on the tool 22 does not occur, and the displacement of the tool unit 3 is prevented.

  In order to receive the rotational reaction force at a pressure angle of 0 °, the angle θ in plan view formed by the first beam 7 and the second beam 9 is optimally 90 °. Therefore, even if the angle θ is not strictly 90 °, the first and second beams 7 and 9 do not turn due to the rotational reaction force. In actual work, as described above, the balance arm 2 slightly rotates in the horizontal direction in accordance with the drag and drilling that the tool 22 receives, but at this level, the tool unit 3 is displaced due to the rotational reaction force. There is no. If the balance arm 2 is sufficiently strong against the drag received by the tool 22, the angle θ in plan view formed by the first beam 7 and the second beam 9 is set within a range of 90 ± 5 °. There is no practical problem.

  When drilling is performed to a desired depth by the tool 22, the pin 13a of the lifter 13 is protruded upward while the drive of the motor 19 is continued. Accordingly, the second beam 9 is lifted upward, and the tool 22 is pulled out from the workpiece W. At this time, since the second beam 9 is a parallel link, the axis of the tool 22 rises while moving slightly in parallel. For this reason, although the tool 22 contacts the hole, the force generated in the direction intersecting the axis of the tool 22 can be absorbed by the horizontal turning operations of the first beam 7 and the second beam 9. In addition, since the lifter 13 is disposed on the stopper plate 10 that can be horizontally rotated integrally with the second beam 9, the lifter 13 moves integrally with the second beam 9 when it horizontally rotates. Therefore, the pin 13a contacting the second beam 9 does not become a resistance element for the horizontal turning operation of the second beam 9, and even the fine horizontal turning operation of the first beam 7 and the second beam 9 is allowed. Thus, the tool 22 can be pulled out from the hole of the workpiece W while aligning, and the tool 22 can be prevented from being broken. In particular, as described above, since the first beam 7 and the second beam 9 can be finely swiveled, even when the tool 22 having a small diameter that causes a small force acting on the tool 22 is pulled out, the breakage is prevented. Can be prevented. Further, since the tool 22 is rotated by driving the motor 19 at the time of extraction, the tool 22 is prevented from being squeezed when contacting the hole, and the effect of preventing the tool 22 from being broken further increases.

Next, an example in which female threading is performed on a workpiece will be shown as a second work example.
When female threading is performed on the workpiece W, first, a pilot hole is formed in the workpiece W using a drill as the tool 22 as described above. Thereafter, the tool 22 is replaced with a collet holder 23 having a tap, and as shown in FIG. 9, the spring connecting member 14 is slid and fixed to the upper limit position. As a result, the upper tension spring 15a urges the link 9b to be pulled up, and the thrust load applied to the tool 22 (tap) (load due to the weight of the tool unit 3 or the like) during processing is moderately reduced.

  Subsequently, the tool unit 3 is operated to position the tip of the tool 22 at the pilot hole entrance of the workpiece W. At this time, for the same reason as described above, the balance arm 2 and the second arm 7 are arranged so that the first and second beams 7 and 9 form about 90 ° in a plan view and the links 9b and 9c of the second beam 9 are substantially horizontal. Set the position / height relationship with the workpiece W. When the motor 19 is driven to rotate forward to rotate the tool 22 in the threading direction, the tool 22 forms a female thread along the pilot hole.

  In the process of female thread cutting, the controller 19 reads the output pulse of the encoder 19b, and when it is detected that the motor 19 has been normally rotated a predetermined number of times, the motor 19 is switched to reverse rotation. Thus, after the motor 19 is reversely driven by the number of rotations smaller than the number of rotations during normal rotation driving, the motor is returned to normal rotation driving again. This is repeated and threading with the tool 22 is performed to a desired depth. As a result, the tool 22 is unscrewed by a smaller amount of rotation each time a predetermined rotational threading is performed, so that the biting of the chips can be prevented and the screw can be molded for stability. In addition, since the thrust load on the tool 22 due to the weight of the tool unit 3 and the like is appropriately reduced by the action of the tension spring 15a, the tool 22 has already been formed in each of threading and unscrewing of the tool 22. Can be rotated along. Therefore, since the tool 22 has already been formed, it is possible to prevent the occurrence of a problem that the tool 22 is bitten by the screw and another female screw is cut.

  Also in this female threading, from the beginning of biting into the lower hole of the tool 22 to the end of female threading, the self-aligning effect by the balance arm 2 and the tool unit 3 by the rotational reaction force are the same as in the above-mentioned hole machining. The effect of preventing the positional deviation is obtained. For this reason, it is possible to prevent breakage of the tap and to reliably cut the female thread.

  When the female screw having a desired depth is formed on the workpiece W, the drive of the motor 19 is switched to the reverse drive, and the tap is removed from the female screw. Also at this time, since the self-aligning effect of the tool 22 by the balance arm 2 is obtained, the tool 22 can be prevented from being broken and reliably pulled out. When the tool 22 is unscrewed to the vicinity of the entrance of the female screw, the lifter 13 is actuated so that the pin 13a protrudes upward, and the second beam 9 is pushed upward. As a result, it is possible to prevent the tool 22 from being quickly detached from the female screw, causing the tool 22 to run idle at the female screw inlet, and to prevent the occurrence of problems such as damaging the inlet end of the female screw.

  As described above, the drill / tapping device 1 prevents the pivoting of the balance arm 2 (positional displacement of the tool unit 3) due to a pure rotational load acting on the tool 22 during drilling or internal thread cutting, and other than that. For the force acting on the tool 22, for example, the force to move the tool 22 in parallel or the bending moment, the swinging movement of the balance arm 2 in the horizontal and vertical planes is allowed, and the tool unit 3 is adjusted to the optimum position. It is something you can mind. For this reason, it is possible to prevent the tool 22 from being broken by a complicated force acting during drilling or internal thread cutting, and to perform drilling reliably. Further, when the tool 22 is pulled out, in addition to the above-mentioned self-aligning action, the lifter 13 can apply a force for turning the second beam 9 upward in the vertical plane. Can be prevented. In particular, when drilling holes and female screws with a diameter of φ2 mm or less by drilling and M2 or less by female threading, the breakage rate of drills and taps is increased. It is also possible to prevent breakage of the minute diameter tool 22.

  In addition, as said tool 22, the drill tap which integrated the drill and the tap on the same axis | shaft can also be used, and by this, pilot hole processing and female threading processing may be performed continuously with one tool. . In the present embodiment, the tension springs 15a and 15b are exemplified as the first and second springs, but other springs such as a compression spring and a fluid spring can be adopted as the spring member used here. By connecting these springs to both ends of the spring connecting member 14 so as to urge the second beam from the up and down directions, the second position of the spring connecting member can be adjusted in the same manner as in the case of the tension springs 15a and 15b. The urging direction and urging force of the beam 9 can be adjusted. Further, as the lifter 13, in addition to the camera shutter operation release exemplified in the present embodiment, other direct acting actuators such as an air cylinder can be used.

DESCRIPTION OF SYMBOLS 1 Drill / tap processing apparatus 2 Balance arm 3 Tool unit 4 Support column 5 Beam holder 6 Rotating shaft 7 1st beam 8 Rotating shaft 9 2nd beam 9a Elbow 9b Link 9c Link 9d Tool holder 10 Stopper plate 11 Stopper block 12 Stopper bolt 13 Lifter 14 Spring connecting member 15a Tensile spring 15b Tensile spring 16 Adjusting plate 17 Butterfly bolt 18 Motor mount 19 AC servo motor 20 Coupling 21 Tool holder 22 Tool 23 Collet holder 24 Steel ball 25 Color W Workpiece

Claims (2)

A first beam that can swivel in a horizontal plane, a second beam that is connected to the first beam so as to swivel in a horizontal plane and that can swivel in a vertical plane, and the second beam A drill tapping device having a tool unit supported by
The tool unit has a hollow shaft-shaped tool holder that rotates by receiving a drive of a rotational drive source, and a shaft-shaped collet holder that is preliminarily disposed integrally with the tool and inserted into the tool holder.
In the tool holder, a hollow hole is formed along the axial center, a steel ball capable of projecting into the hollow hole is disposed, and a drive wall in which a part of a wall surface of the hollow hole is formed in one or a plurality of planes. While providing a hole,
The collet holder is provided with a drive transmission shaft portion that can be fitted and fitted to the drive transmission hole portion, and the collet holder is inserted into the tool holder until the drive transmission shaft portion is fitted and fitted to the drive transmission hole portion. And a groove disposed at a position where the steel ball can be fitted to extend in the circumferential direction, and further, the hollow hole extends over a predetermined length from the groove in the insertion direction to the tool holder. Drill / tapping machine characterized by having a diameter along   The length of the diameter part along the hollow hole of the tool holder in a collet holder is a length more than the fitting depth of a drive transmission shaft part and a drive transmission hole part, The drill * of Claim 1 characterized by the above-mentioned. Tapping machine.

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