JP5279411B2 - Work positioning device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a workpiece positioning device that positions various workpieces without need of providing a dedicated positioning mechanism per workpiece on a jig. <P>SOLUTION: The positioning device includes a holder 100 having a chuck that can engage with the main spindle of a machining center, a holder side feed screw-thread 131 formed in the holder, a clamp shaft 200 having a clamp shaft side feed screw screwed together with the holder side feed screw-thread, a supporting body 300 that supports the clamp shaft while axially supporting the holder, and a chuck 400 with an opening/closing function provided on the supporting body. The motions of the holder side feed screw and the clamp side feed screw based on the main spindle rotations enable the clamp shaft to move back and forth from the holder, open and close the chuck via the chuck opening/closing function according to the back and forth motions of the clamp shaft, and position the workpiece by the end of the chuck gripping and releasing a part of the workpiece. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a workpiece positioning device that can be suitably used when, for example, a camshaft is processed by a machining center.

For example, when machining a camshaft or the like with a machining center, the conventional camshaft machining equipment has a workpiece positioning mechanism on the jig, clamps the workpiece at the front and rear centers, determines the phase, and then chucks Is going. Thus, the structure which provided the positioning mechanism in the jig | tool is conventionally known (for example, refer patent document 1).
Japanese Patent Laying-Open No. 2003-181731 (page 4-5, FIG. 15)

  If the jig has a workpiece phasing mechanism, for example, if the workpiece is a camshaft, convex portions for phasing are formed at various positions on the camshaft. Must be prepared. That is, a general-purpose phasing jig cannot be used for the jig itself, and a dedicated jig needs to be used in accordance with the convex portion for phasing the camshaft, resulting in high manufacturing costs.

  An object of the present invention is to provide a workpiece positioning apparatus that can perform positioning of various workpieces without the need to provide a dedicated positioning mechanism that is different for each workpiece in a jig.

In order to solve the above-described problem, a workpiece positioning apparatus according to claim 1 of the present invention includes:
A holder having a chuck portion engageable with the spindle of the machining center;
A holder-side feed screw portion having an axis common to the axis of the main shaft and formed in the holder;
A clamp shaft having a clamping shaft side feed screw portion screwed to the holder-side feed screw unit,
A support body that rotatably supports the holder and slidably supports the clamp shaft, and is partially fixed to a housing that houses the main shaft;
A chuck provided in a direction opposite to the main shaft than the clamp shaft of the support and having a chuck opening and closing function;
The clamp shaft is prevented from rotating by the chuck, and the clamp shaft can be advanced and retracted from the holder by the movement of the holder side feed screw portion and the clamp side feed screw portion based on the rotation of the main shaft. And the chuck opens and closes via the chuck opening / closing function according to the advance / retreat of the clamp shaft, and the chuck tip grips or separates a part of the workpiece a plurality of times to process the workpiece. It is characterized by positioning with respect to the machining center .

  According to the workpiece positioning apparatus of the present invention, a holder having a clamp portion that can be engaged with the spindle of the machining center, a holder-side feed screw portion that has an axis common to the axis of the spindle and is formed on the holder, and the holder side The clamp shaft has a clamp shaft-side feed screw portion that is screwed into the feed screw portion, and the chuck opens and closes via the chuck opening and closing function as the clamp shaft advances and retreats, and the chuck tip grips part of the workpiece. Since the workpiece is positioned after being separated, it is not necessary to provide a workpiece positioning mechanism on the jig. As a result, it is possible to deal with various workpieces, and it is not necessary to prepare a dedicated jig equipped with a unique positioning mechanism for each workpiece, and the manufacturing cost can be reduced.

Moreover, the workpiece positioning device according to claim 2 of the present invention is the workpiece positioning device according to claim 1,
The chuck includes two L-shaped arms in plan view and an arm support portion that supports the arms, and a bent portion of each arm is fitted to a fulcrum pin formed on the arm support portion. A notch is formed in the base end portion opposite to the side, and the notches cooperate to form a long hole in a state where the arms around the notch overlap with each other, and the main shaft of the clamp shaft The elongated hole is engaged with an engaging pin that is formed to protrude in the vicinity of the tip on the opposite side.

  Since the chuck has such a configuration, the engagement pin and the long hole cooperate with each other in accordance with the advancement and retreat of the clamp shaft, thereby reliably opening and closing the chuck.

  Preferably, in the workpiece positioning device according to the present invention, a tip of the chuck is provided with a conical workpiece positioning portion, the workpiece is formed of a camshaft, and the protruding portion of the camshaft is sandwiched between the workpiece positioning portions. It is preferable that the extending direction of the protruding portion of the camshaft coincides with the direction of the central axis of the main shaft of the machining center by repeating the opening.

  Since the position, shape, and dimension of the positioning portion of the camshaft are often different for each camshaft, the position, shape, and dimension of the positioning portion are different for each camshaft by using the workpiece positioning device according to the present invention. There is no need to prepare a dedicated jig.

  According to the workpiece positioning apparatus of the present invention, it is possible to provide a workpiece positioning apparatus capable of positioning various workpieces without providing a jig with a dedicated positioning mechanism that is different for each workpiece.

  Hereinafter, a workpiece positioning apparatus according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a workpiece positioning device 1 according to an embodiment of the present invention in a partial cross section. 2 is a view as seen from the direction of arrows II-II in FIG. 3 is a view as seen from the direction of arrows III-III in FIG.

  As shown in FIG. 1, the workpiece positioning device 1 of the present embodiment includes a holder 100, a holder-side feed screw portion 131 formed on the holder 100, a clamp shaft 200 screwed into the holder-side feed screw portion 131, A support body 300 that fixes the holder 100 and the clamp shaft 200 to the housing 20 that houses the main shaft 10, and a chuck 400 provided on the support body 300 are provided.

  The holder 100 includes a tool holder chuck 110 that can be engaged with the spindle 10 of the machining center, an ATC shank 120 that forms a holder main body, and a cylindrical nut 130 that is attached to the ATC shank 120 via a bolt 121. The cylindrical nut 130 has an axis common to the axis of the main shaft 10, and a holder-side feed screw portion 131 is formed on the inner peripheral surface thereof.

  The clamp shaft 200 is formed with a clamp shaft-side feed screw portion 201 that is screwed to the holder-side feed screw portion 131, and is adjacent to the clamp shaft-side feed screw portion 201 and on the opposite side of the main shaft 10 with a stopper 202 and a bearing. A sliding portion 210 is formed, and a chuck engaging portion 220 from which an engaging pin 221 protrudes is formed on the distal end side of the main shaft 10. The first bearing 301 is pressed against the main shaft side flange of the cylindrical nut 130 by a collar 305 and a nut 306.

  The support body 300 rotatably supports the holder 100 via the first bearing 301 and supports the clamp shaft 200 so as to be slidable via the second bearing 302, and is supported by the housing 20 that houses the main shaft 10. The part is fixed.

  A connecting portion 310 of the support 300 with respect to the housing 20 that houses the main shaft 10 has an L shape, and the connecting pin 320 is housed in a state in which it is urged in one direction by the urging force of the spring 321. The spring 321 is accommodated in the connecting portion by the spring seat portion 322 and the retaining ring 323.

  A positioning surface 325 is formed at the tip of the connecting pin 320, and this tip is engaged with the positioning hole 21 of the housing 20 that houses the main shaft 10. The connection pin 320 is provided with a non-rotating rod 330. When the work positioning device 1 is attached to the main shaft 10, the tip of the connection pin 320 formed with the positioning surface 325 is pushed by the positioning hole 21, and the spring 321 is compressed. Thus, the rotation prevention rod 330 is detached from the groove portion 125 of the ATC shank 120 so that the holder 100 can rotate. The support 300 is mainly composed of three blocks 300A, 300B, and 300C, and are fixed to each other via bolts 329 and 339.

  The clamp shaft 200 has a rectangular cross-section and is fitted to the corresponding sliding portion of the chuck 400 so that the clamp shaft 200 does not rotate. Accordingly, the holder side feed based on the rotation of the main shaft 10 is prevented. The movement of the screw part 131 and the clamp-side feed screw part 201 cooperates so that the clamp shaft 200 can advance and retreat from the holder 100. Then, the chuck 400 is opened / closed via the chuck opening / closing function according to the advance / retreat of the clamp shaft 200, and the workpiece 50 is positioned by the chuck tip pinching or separating a part of the workpiece 50.

  The chuck 400 is provided in a direction opposite to the main shaft 10 rather than the clamp shaft 200 of the support 300 and has an opening / closing function. The opening / closing mechanism of the chuck 400 has two arms 410 that are L-shaped in plan view and an arm support portion 420 that supports the arms. The bent portions 411 of the arms 410 are fitted to fulcrum pins 421 formed on the arm support portions 420. A semi-oval cutout 414a is formed at the base end of each arm 410 opposite to the work chuck side. Then, with the arms 410 around the notches overlapped with each other, the notches cooperate to form a long hole 414b, and the engagement pin 221 is formed to project to the tip side opposite to the main shaft 10 of the clamp shaft 200. A long hole 414b is engaged with the first hole.

  A tip of the chuck 400 is provided with a conical claw portion (work positioning portion) 430. The workpiece 50 is composed of a camshaft. By repeatedly sandwiching and releasing the camshaft phasing portion 51 between the claws, the extending direction of the camshaft phasing portion 51 is in the direction of the central axis of the spindle 10 of the machining center. It comes to match.

  Hereinafter, the operation of the workpiece positioning device 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a diagram for explaining the operation of the workpiece positioning apparatus 1 according to the present invention, and shows a state in which the chuck 400 is completely closed and the phase determining convex portion 51 of the workpiece 50 is sandwiched between the claw portions 430. FIG. 5 is a view showing a state in which the chuck 400 starts to open from the state shown in FIG. FIG. 6 is a view showing a state where the chuck 400 is completely opened following the state shown in FIG.

  As a work procedure for determining the workpiece phase, the tool holder chuck 110 is first attached to the main shaft 10, and the positioning surface 325 at the end of the connecting pin main body is engaged with the positioning hole 21 provided in the housing 20 of the main shaft 10. As a result, the connecting pin 320 first moves to the chuck side against the biasing force of the spring 321, and the detent rod 330 is removed from the groove 125 of the ATC shank 120 so that the holder 100 can rotate relative to the support 300. It becomes a state.

  Then, the phase determining convex portion 51 of the workpiece 50 is aligned with the claw portion 430 of the chuck 400 as shown in FIG. The workpiece 50 at this time is a camshaft, but the workpiece 50 is fixed by sandwiching center holes at both ends of the camshaft with positioning pins (not shown here), and the phase determining convex portion 51 is a claw portion 430 at the tip of the arm. Temporary positioning to enter between.

  Then, the main shaft 10 is rotated, for example, about 3 rotations in one direction. As a result, the cylindrical nut 130 integrated with the ATC shank 120 rotates. At this time, since the cylindrical nut 130 is pivotally supported on the support body 300 via the first bearing 301, it rotates smoothly. As the cylindrical nut 130 rotates, the holder-side feed screw portion 131 and the clamp shaft-side feed screw portion 201 cooperate to feed the clamp shaft 200 away from the main shaft 10. At this time, the tip end of the clamp shaft 200 is restrained in the rotation direction by the arm support portion 420, so that the clamp shaft 200 is sent out without rotating. Further, since the clamp shaft 200 is slidably supported by the support body 300 by the second bearing 302, it is fed out smoothly.

  Along with this, the engagement pin 221 of the clamp shaft 200 pushes the long hole 414b formed by the two arms 410 of the chuck 400 forward, and both arms 410 rotate around the fulcrum pin 421 on the principle of leverage. The tip of the arm 410 is expanded (see FIG. 5).

  When the main shaft 10 is further rotated, the clamp shaft 200 is further pushed out, and the engagement pin 221 of the clamp shaft 200 pushes the long hole 414b formed in the arm 410 further forward, thereby further expanding the tips of both arms 410. Open.

  The clamp shaft 200 stops pushing when the stopper 202 abuts against the stopper abutting portion 351 of the support 300 (see FIG. 6).

  Subsequently, the main shaft 10 is rotated about three rotations in the reverse direction. As a result, an operation opposite to the operation of the chuck 400 described above is performed. That is, the expanded arm 410 is closed again in the order shown in FIGS.

  Such an operation is repeated several times, and the phase is determined so that the extending direction of the phase determining convex portion 51 of the workpiece 50 matches the axial direction of the main shaft 10. Then, after the phase determination operation of the workpiece 50 is completed, the workpiece positioning device 1 is removed from the main shaft 10 and a tool such as a drill is attached to the main shaft 10. In this case, a cooling portion is attached to a predetermined portion of the workpiece 50 which is a camshaft. Processing to drill holes and so on.

  That is, the workpiece positioning device 1 according to the present embodiment is characterized in that it is a positioning device that can be attached to and detached from the main shaft, that is, a positioning device that can be attached to and detached from the main shaft of the machining center. Specifically, the positioning device attached to the main shaft using the tool clamp mechanism of the machining center is moved to an arbitrary position on the jig using the feed shaft of the machining center to position the workpiece (centering clamp). Do. The positioning device is driven and detected by the rotation of the spindle and the NC coordinates. As a result, the additional operation and effect of the present invention in which the drive source and operation detection dedicated to the chuck become unnecessary is also exhibited.

  In the positioning device that is coupled to the main shaft by the tool clamping mechanism of the main shaft and is restricted in the rotational direction by the main shaft head body, the nut in the device is rotated by rotating the main shaft, thereby clamping (screw) The positioning chuck opens and closes when the shaft moves back and forth.

  As described above, the conventional camshaft machining equipment has a positioning mechanism in the jig, and after clamping the workpiece at the front and rear centers, positioning and then chucking are performed. However, the workpiece (camshaft) positioning according to the present invention is performed. According to the apparatus, by providing the positioning device on the spindle of the machining center, a jig that is simple and flexible with respect to the type of workpiece can be realized.

  As described above, according to the workpiece positioning apparatus according to the present invention, the holder having the clamp portion that can be engaged with the spindle of the machining center, and the holder-side feed screw portion that has an axis common to the axis of the spindle and is formed on the holder. And a clamp shaft having a clamp shaft side feed screw portion screwed to the holder side feed screw portion, and the chuck opens and closes via the chuck open / close function according to the advance / retreat of the clamp shaft, and the chuck tip is one of the workpieces. Since the workpiece is positioned by gripping or releasing the part, it is not necessary to provide a workpiece positioning mechanism on the jig. As a result, it is possible to deal with various workpieces, and it is not necessary to prepare a dedicated jig equipped with a unique positioning mechanism for each workpiece, and the manufacturing cost can be reduced.

  Preferably, the chuck includes two L-shaped arms in plan view and an arm support portion that supports the arms, and a bent portion of each arm is fitted to a fulcrum pin formed on the arm support portion. A notch is formed at the base end opposite to the side, and the notch cooperates to form a long hole with the arms around the notch overlapping each other. It is preferable that the elongated hole is engaged with an engaging pin that is formed to protrude in the vicinity of the tip end of the member.

  Since the chuck has such a configuration, the engagement pin and the long hole cooperate with each other in accordance with the advancement and retreat of the clamp shaft, thereby reliably opening and closing the chuck.

  Preferably, the tip of the chuck is provided with a conical workpiece positioning portion, the workpiece is composed of a camshaft, and the camshaft protruding portion is repeatedly sandwiched and released by the workpiece positioning portions. It is preferable that the extending direction of the head is aligned with the central axis direction of the main axis of the machining center.

  Since the camshaft often has a different positioning portion for each camshaft, it is not necessary to prepare a dedicated jig for each camshaft having a different positioning portion by using the workpiece positioning device according to the present invention.

  The embodiments described above are merely examples of specific embodiments of the present invention, and it goes without saying that various modifications can be considered without departing from the scope of the present invention.

It is the side view which showed the work positioning device which concerns on one Embodiment of this invention in the partial cross section. It is the figure seen from the arrow II-II direction in FIG. It is the figure seen from the arrow III-III direction in FIG. It is a figure explaining the effect | action of this invention, and is a figure which shows the state which the chuck | zipper closed completely and the phase determination convex part of the workpiece | work was pinched | interposed with the nail | claw part. FIG. 5 is a diagram illustrating a state in which the chuck starts to open from the state illustrated in FIG. 4. FIG. 6 is a view showing a state where the chuck is completely opened following the state shown in FIG. 5.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Work positioning device 10 Main shaft 20 Housing 21 Positioning hole 50 Work 51 Phase-determining convex part 100 Holder 110 Tool holder chuck 120 ATC shank 121 Bolt 125 Groove part 130 Cylindrical nut 131 Holder side feed screw part 200 Clamp shaft 201 Clamp axis side feed screw Part 202 Stopper 210 Bearing sliding part 220 Chuck engaging part 221 Engaging pin 300 Support body 300A, 300B, 300C Block 301 First bearing 302 Second bearing 305 Collar 306 Nut 310 Connecting part 320 Connecting pin 321 Spring 322 Spring seat part 323 Retaining ring 325 Positioning surface 329, 339 Bolt 330 Non-rotating rod 351 Stopper contact part 400 Chuck 410 Arm 411 Bending part 414a Cutting Can 414b slots 420 arm support 421 support pin 430 pawl portion (workpiece positioning portion)

Claims (2)

A holder having a chuck portion engageable with the spindle of the machining center;
A holder-side feed screw portion having an axis common to the axis of the main shaft and formed in the holder;
A clamp shaft having a clamping shaft side feed screw portion screwed to the holder-side feed screw unit,
A support body that rotatably supports the holder and slidably supports the clamp shaft, and is partially fixed to a housing that houses the main shaft;
A chuck provided in a direction opposite to the main shaft than the clamp shaft of the support and having a chuck opening and closing function;
The clamp shaft is prevented from rotating by the chuck, and the clamp shaft can be advanced and retracted from the holder by the movement of the holder side feed screw portion and the clamp side feed screw portion based on the rotation of the main shaft. And the chuck opens and closes via the chuck opening / closing function according to the advance / retreat of the clamp shaft, and the chuck tip grips or separates a part of the workpiece a plurality of times to process the workpiece. A workpiece positioning device characterized by positioning with respect to a machining center .   The chuck includes two L-shaped arms in plan view and an arm support portion that supports the arms, and a bent portion of each arm is fitted to a fulcrum pin formed on the arm support portion. A notch is formed in the base end portion opposite to the side, and the notches cooperate to form a long hole in a state where the arms around the notch overlap with each other, and the main shaft of the clamp shaft The workpiece positioning apparatus according to claim 1, wherein the elongated hole is engaged with an engagement pin that is formed to protrude in the vicinity of the tip portion on the opposite side of the workpiece.

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