JP2006341367A - Internal shaving attachment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal shaving attachment, preventing shavings generated in the process of shaving from remaining on an internal tooth of the internal gear, and improving working accuracy. <P>SOLUTION: A workpiece chuck 2 and a shaving cutter 3 are supported movably toward and away from each other in the vertical direction with the workpiece chuck 2 higher, and also supported to relatively move in the horizontal direction. The workpiece chuck 2 is constructed to hold the outer peripheral surface of the internal gear with the axis of rotation of the internal gear pointed to the vertical direction so that the shavings generated in machining using the shaving cutter 3 fall downward from the internal gear, and supported on a support 7 supported to slide in the vertical direction and driven to elevate by an elevating actuator. The workpiece chuck is covered with a coolant scattering preventing cover 72 extending from the front of the workpiece chuck 2 to the right and left sides, and the coolant scattering preventing cover 72 is supported on the support 7 to freely move in the vertical direction. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an internal tooth shaving device.

A conventional internal tooth shaving device is configured to mesh a shaving cutter with an internal gear supported rotatably around a horizontal axis at a predetermined crossing angle, and rotate at least one of the shaving cutter and the work chuck while rotating the tooth surface of the internal gear. Is generally finished (see, for example, Patent Document 1).
JP 2003-117729 A

  However, the above-described conventional internal tooth shaving device has a problem in that shavings generated during shaving remain on the internal teeth of the internal gear, which adversely affects machining accuracy.

  Further, in order to remove frictional heat from the internal gear during shaving, coolant is supplied to the internal gear, but since the shavings scatter around the coolant, the entire surface and side surfaces of the apparatus are covered with the main body cover. However, with the main body cover alone, the scattered shavings adhere to the unprocessed internal gear waiting in the main body cover, which may adversely affect the processing accuracy.

  Then, an object of this invention is to provide the internal tooth shaving apparatus which can wipe out the said conventional problem.

  In order to achieve the above object, an internal tooth shaving device according to the present invention meshes a shaving cutter and an internal gear held by a work chuck with an intersecting angle, and rotationally drives at least one of the shaving cutter and the work chuck. An internal gear shaving device for finishing a tooth surface of the internal gear while the workpiece chuck and the shaving cutter are supported so as to be able to approach and separate in the vertical direction with the workpiece chuck as an upper side, and in the horizontal direction. The workpiece chuck is supported so that a shaving generated during machining by a shaving cutter can fall downward from the internal gear with the axis of rotation of the internal gear directed vertically. It is configured to grip the outer peripheral surface of the gear and is supported so as to be slidable in the vertical direction. The coolant is supported by a support that is driven up and down by a rotor, and is covered with a coolant scattering prevention cover from the front to the left and right sides of the work chuck. It is characterized by being supported movably.

  It is preferable that the coolant scattering prevention cover is supported such that the lower end of the cover is movable further downward from the lower end of the work chuck.

  A main shaft for rotating the work chuck is extended in the vertical direction, the coolant pipe passes through the main shaft in the axial direction and is supported so as not to rotate around the axis, and the coolant discharge port is directed in a predetermined direction. Preferably it is.

  According to the internal tooth shaving device according to the present invention, the shavings being processed fall downward from the tooth surface of the workpiece, do not remain on the tooth surface, and are supported movably by the support body that supports the work chuck. Further, the coolant splash prevention cover can prevent the coolant splashing accurately, so that the processing accuracy can be improved.

  A preferred embodiment of an internal tooth shaving device according to the present invention will be described below with reference to FIGS. In addition, the same code | symbol was attached | subjected to the same component through the whole figure.

  As shown in FIGS. 1 to 3, the internal-tooth shaving device 1 is such that the work chuck 2 and the shaving cutter 3 are supported so as to be able to approach and separate in the vertical direction with the work chuck 2 on the upper side, and the horizontal movement is relatively performed. Supported as possible. The entire surface and side surfaces of the entire apparatus are covered with a main body cover 70 as shown by a one-dot chain line in FIGS. 1 to 3 indicates an open / close type viewing window of the main body cover 70.

  In the illustrated example, the work chuck 2 can be driven to rotate about a vertical axis by a spindle motor 4, and is supported together with the spindle motor 4 so as to be movable in the vertical direction by a lifting actuator 5.

  Then, in order for the shaving cutter 3 to mesh with the internal gear held by the work chuck 2 with a crossing angle, as shown by an arrow R in FIG. And can stop at a predetermined swing angle. Further, the shaving cutter 3 can be moved horizontally in the horizontal direction (Y direction in FIG. 2) by the drive unit 30. In the illustrated example, the shaving cutter 3 rotates with an internal gear that is driven to rotate.

  The work chuck 2 employs a collet chuck that grips the outer peripheral surface of the internal gear with the rotation axis of the internal gear oriented in the vertical direction so that shavings generated during processing by the shaving cutter 3 can fall downward from the internal gear. be able to.

  FIG. 4 is a longitudinal sectional view showing details of the shaving cutter 3. FIG. 4 shows a swing shaft 31 for swinging the shaving cutter 3, a worm wheel 32 fixed to the rear end of the swing shaft 31, and a worm 33 that meshes with the worm wheel 32.

  Further, FIG. 4 shows a clamp device 34 for fixing the shaving cutter 3 at a desired swing angle. The clamp device 34 includes a hydraulically driven piston 34 a, a piston rod 34 b fixed to the piston 34 a, and a clamper 34 c connected to the tip of the piston rod 34 c, and the clamper 34 c moves the peripheral flange portion 3 a of the shaving cutter 3. After pressing, the shaving cutter 3 can be set to a desired swing angle and then fixed.

  As shown in FIG. 5, the lifting / lowering actuator 5 is disposed so that the rotation axis of the motor shaft is directed in the vertical direction, and is fixed to the structural frame F. A screw shaft 5b is connected to the rotary shaft 5a of the lifting / lowering actuator 5, and the screw shaft 5b extends in the vertical direction. A nut body 6 is screwed into the screw shaft 5b. The nut body 6 is connected to the support body 7. The support 7 is slidably mounted on a vertical rail 8 (see FIG. 1) provided on the structural frame F. Moreover, in order to balance the left and right of the support 7, the left and right ends of the support 7 are connected to the piston rods of the balance cylinders F <b> 1 and F <b> 2 supported by the structural frame F.

  A spindle motor 4 and a main shaft 9 are supported on the support 7. The spindle motor 4 and the main shaft 9 have their respective axes oriented in the vertical direction, and are connected by driving with a gear 10. The main shaft 9 is supported by bearings 11, 12 and 13 (FIG. 6) in the support body 7 so as to be rotatable around the axis. As shown in FIG. 6, the work chuck 2 is supported on the main shaft 9.

  When the lifting / lowering actuator 5 is driven, the support body 7 is moved up and down along the screw shaft 5b, whereby the work chuck 2 is moved up and down together with the main shaft 9. When the spindle motor 4 is driven, the main shaft 9 rotates and the work chuck 2 is rotated.

  Further, as shown in an enlarged view in FIGS. 7 and 8, a coolant scattering prevention cover 72 is supported on the support 7. The coolant scattering prevention cover 72 is supported by the support 7 so as to be movable in the vertical direction. A slide rail extending in the vertical direction is fixed to the support 7. The coolant scattering prevention cover 72 includes a roller 74 that runs on the slide rail 73. A hydraulic cylinder 75 is fixed to the support 7, and a piston rod of the hydraulic cylinder 75 is connected to a coolant scattering prevention cover 72. Accordingly, the coolant scattering prevention cover 72 moves up and down on the slide rail by the operation of the hydraulic cylinder 75.

  As shown by a one-dot chain line in FIG. 7, the coolant scattering prevention cover 72 is supported such that the lower end of the cover is further movable downward from the lower end of the work chuck 2.

  As shown in an enlarged cross-sectional view in FIG. 6, the work chuck 2 has a collet 2 f that grips the outer peripheral surface of the internal gear with the rotation axis of the internal gear that is the work W directed in the vertical direction, and the rotation axis of the work W. And a work stopper 2s having a seat surface that receives the upper end surface in the axial direction of the work W in the vertical direction.

A seat plate block 2j is fixed to the lower end of the main shaft 9 by a bolt B1. Seat plate block 2j has a cylindrical portion 2j ₁ which is fitted to the lower end recess 9a of the main shaft 9.

  A drive shaft 2 a for driving the collet 2 f is disposed so as to penetrate the inside of the main shaft 9 in the axial direction of the main shaft 9. A pull stud 2p is detachably attached to the lower end of the drive shaft 2a.

Pull stud 2p is inserted into the cylindrical portion 2j ₁ of the seat plate block 2j. A radially extending arm 2b is screwed to the pull stud 2p, and the arm 2b is accommodated in the open space 2js of the seat plate block 2j. In FIG. 6, only an arm extending in one direction is shown for convenience of illustration, but in the embodiment, it extends in three directions at equal angular intervals.

  A guide member 2i having a tapered inner peripheral surface is fixed to the seat plate block 2j by a bolt B2. The work stopper 2s is sandwiched between the seat plate block 2j and the guide member 2i.

A connecting rod 2c is fixed to the arm 2b by a bolt B3. The connecting rod 2c penetrates the guide member 2i. In the guide member 2i, a collet holding ring 2d is connected by a bolt B4. A collet clamping ring 2e is fixed to the collet clamping ring 2d by a bolt B5. These clamping ring 2d, the flange portion 2f ₁ of the collet 2f during 2e is held.

  The collet 2f has a slit (not shown) and a tapered outer surface guided by the tapered inner peripheral surface of the guide member 2i. Therefore, when the drive shaft 2a is pulled upward in the drawing, the tapered outer peripheral surface of the collet 2f is guided by the tapered inner peripheral surface of the guide member 2i, and the collet 2f is radially reduced in diameter by elastic deformation. The outer peripheral surface of the internal gear is tightened and clamped.

  A rotary joint 77 is attached to the upper end of the drive shaft 2a. The rotary joint 77 includes hydraulic oil ports 22 and 23 (FIG. 9). A piston 24 is fixed to the drive shaft 2a. The piston 24 is accommodated in a piston chamber 25, and the piston chamber 25 is screwed to a gear holder 26 fixed to the main shaft 9 via a gear 10, as shown in FIG. Therefore, the piston chamber 25 does not move up and down with respect to the support 7 and rotates together with the main shaft 9.

As shown in FIG. 6, hydraulic oil chambers 25 a and 25 b that are vertically partitioned by the piston 24 are formed in the piston chamber 25. The hydraulic oil ports 22 and 23 communicate with the hydraulic oil chambers 25a and 25b, respectively. In the illustrated example, the drive shaft 2a, the upper shaft portion 2a ₁ of the piston 24 is formed, it is screwed to the lower shaft portion 2a _2.

  When hydraulic oil is supplied to the lower hydraulic oil chamber 25b in FIG. 6 and discharged from the upper hydraulic oil chamber 25a, the piston 24 is pushed upward in FIG. 6, thereby pulling up the drive shaft 2a, The collet 2f tightens the workpiece W. In the opposite case, the collet 2f is expanded, and the workpiece W held can be removed.

The position of the vertical movement of the drive shaft 2 a is detected by the sensors 27 and 28. The sensors 27 and 28 can employ proximity switches. The sensors 27 and 28 are fixed to a cap body 78 attached to the upper part of the rotary joint 77. The upper end portion 2a ₁ of the drive shaft 2a, a pair of upper and lower annular protrusions 20a, 20b are formed. When the work chuck 2 is at the chuck position, the sensor 27 detects the convex portion 20a, and when the work chuck 2 is at the non-chuck position, the sensor 28 detects the convex portion 20b.

  A protrusion 25p is formed on the side of the casing forming the piston chamber 25. The sensor 50 detects this protrusion 25p. The sensor 50 is fixed to a plate 29 erected on the cover casing 7 a of the support 7. The plate 29 includes a projecting piece 29a slidably engaged with a longitudinal groove 77a (see FIG. 9) formed in the rotary joint 77. Accordingly, the rotary joint is restricted from rotating around the vertical axis by the protrusion 29a, but is allowed to move in the vertical direction. The sensor 50 detects the original position (0 angle position) related to the rotation angle of the main shaft 9 by the protrusion 25p. It is necessary to detect the original position of the main shaft 9 in order to phase the teeth of the internal gear that is the workpiece W and the teeth of the shaving cutter 3.

  The coolant pipe P1 passes through the drive shaft 2a and the pull stud 2p in the axial direction. The upper end portion of the coolant pipe P1 is fixed to the cap body 78, and the lower end portion thereof is supported by a radial bearing 2sb supported by the work stopper 2s. The distal end portion of the coolant pipe P1 protruding from the radial bearing 2sb into the work chuck 2 extends sideways in the work chuck 2, and the coolant discharge port is formed between the internal gear W held by the work chuck 2 and the shaving cutter 3. Directed to the meshing point. Thus, while the main shaft 9 is rotating and shaving, the coolant pipe P1 does not rotate, and the coolant is always supplied from above the internal gear W to the meshing point of the internal gear W and the shaving cutter 3.

  The internal tooth shaving device 1 includes a work transfer unit for transferring an internal gear, which is a work, to the work chuck 2. The workpiece transfer unit has a workpiece carry-in arm 41 and a workpiece carry-out arm 42.

  The workpiece loading arm 41 is supported so as to be swingable around a first swing axis 41 a parallel to the rotation axis of the work chuck 2, and a workpiece replacement position Yc positioned on the vertical movement path of the work chuck 2. It swings between a workpiece insertion position Yin separated from the workpiece replacement position to the front right side.

  The workpiece carry-out arm 42 is supported so as to be swingable around a second swing axis 42a parallel to the rotation axis of the work chuck 2, and is separated from the workpiece replacement position Yc and the workpiece replacement position Yc to the left on the near side. Swings between the workpiece take-out position Yout.

  The workpiece carry-in arm 41 and the workpiece carry-out arm 42 are oscillated by hydraulic cylinders 41m and 42m, and a pinion rack (not shown) that converts the linear motion of these hydraulic cylinders 41m and 42m into rotational motion, respectively.

  The workpiece carry-in arm 41 supports the internal gear with its axis of rotation directed in the vertical direction so that the work chuck 2 can grip the internal gear on the workpiece carry-in arm 41 from above.

  The workpiece carry-in arm 41 can have an indexing function of an internal gear that is the workpiece W. The indexing function can be constituted by a positioning pin, a proximity sensor or the like.

  Workpiece replacement and machining are performed as follows. First, when a workpiece is placed at the workpiece loading position Yin, the workpiece loading arm 41 swings and loads the workpiece into the workpiece replacement position. Next, the work chuck 2 descends and grips the work on the work carry-in arm 41. Thereafter, the work chuck 2 moves up to a position where it does not interfere with the work carry-in arm 41, and the work carry-in arm 41 swings back to the work loading position.

  Next, the work chuck 2 is lowered and lowered to a height position where the shaving cutter 3 enters the internal gear W. At the same time, the coolant splash prevention cover 72 moves down on the support 7, the lower end of the cover moves further downward from the lower end of the work chuck 2, and covers the lower front and side surfaces of the work chuck 2. The shaving cutter 3 swings around the horizontal axis so as to make a desired crossing angle with the workpiece. The shaving cutter 3 is fixed at a desired swing angle, then moves in the horizontal direction, approaches the internal gear W, and meshes with the internal gear W.

  When the workpiece chuck 2 forcibly rotates the workpiece, the shaving cutter 3 rotates with the workpiece, and finishing processing is performed by combining the vertical movement of the workpiece chuck 2 and the horizontal movement of the shaving cutter 3. When the work chuck 2 is raised and the coolant splash prevention cover 72 is also raised after the finishing process is completed, the work carry-out arm 42 swings to the work exchange position Yc located between the work chuck 2 and the shaving cutter 3. Prepare to receive the processed workpiece by moving. When the workpiece chuck 2 is lowered and the workpiece unloading arm 42 receives a processed workpiece from the workpiece chuck 2, the workpiece unloading arm 42 swings and moves after the workpiece chuck 2 is raised to a position where it does not interfere with the workpiece unloading arm 42. The processed workpiece is carried out from the exchange position Yc to the workpiece removal position Yout.

  The internal-tooth shaving device 1 having the above-described configuration causes the shaving cutter 3 to oscillate to have a predetermined crossing angle with the internal gear as the work W gripped by the work chuck 2, and to move the work chuck 2 in the vertical direction and to perform shaving. Shaving such as conventional processing is performed by moving the cutter 3 in the horizontal direction.

  During machining, the opening formed by the tooth surface of the internal gear, which is a workpiece, faces downward, and the shavings that are being machined fall together with the coolant, so that no shavings remain on the internal teeth. Accordingly, the processing accuracy is improved. The shavings are collected together with the coolant in a dust box (not shown) through a shooter (not shown), and separated from the coolant by a magnetic separator (not shown).

  Furthermore, since the coolant is intensively supplied from above to the cutting point of the internal gear, the coolant is stably supplied and contributes to the improvement of processing accuracy.

  Further, by providing the coolant scattering prevention cover 72 that moves together with the work chuck separately from the main body cover, it is possible to accurately prevent coolant scattering and to improve the processing accuracy. Further, the coolant scattering prevention cover 72 is supported by the support 7 supporting the work chuck so as to be movable in the vertical direction. Therefore, the coolant scattering prevention cover 72 moves independently from the work chuck 2 and opens the work exchange space at the work exchange position. Therefore, it can be raised to a position equal to or higher than the lower end position of the work chuck 2, and can be lowered further below the lower end of the work chuck in order to effectively prevent the coolant from being scattered at the work processing position.

  In the above embodiment, a configuration in which the work chuck moves up and down for exchanging the workpiece is adopted, but a configuration in which the workpiece carry-in arm and the workpiece carry-out arm are moved up and down may be adopted. In the above embodiment, the shaving cutter is swingable. However, the work chuck can be swingably configured. Furthermore, instead of forcibly driving the workpiece, the shaving cutter may be forcibly driven, or both the shaving cutter and the workpiece can be forcibly driven in synchronization. Furthermore, although the collet chuck is shown as the work chuck in the above embodiment, a drill chuck or other gripping means can be employed.

It is a front view equivalent to the II view of FIG. 3 which shows 1st Embodiment of the internal-tooth shaving apparatus which concerns on this invention. It is a side view of the internal-tooth shaving apparatus shown in FIG. FIG. 3 is a plan view corresponding to the III-III view of FIG. 2. It is a longitudinal cross-sectional view which shows the internal structure of the shaving cutter which is a component of the internal-tooth shaving apparatus shown in FIG. FIG. 2 is an enlarged longitudinal sectional view taken along line V in FIG. 1. It is the longitudinal cross-sectional view which abbreviate | omitted a part of FIG. 5 and expanded. It is a side view which expands and shows a part of FIG. It is a front view which expands and shows a part of FIG. It is a top view which expands and shows a part of internal tooth shaving apparatus of FIG .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Internal tooth | gear shaving apparatus 2 Work chuck 2a Drive shaft 3 Shaving cutter 7 Support body 9 Main shaft 70 Main body cover 72 Coolant scattering prevention cover P1 Coolant pipe

Claims (3)

An internal tooth shaving device that meshes a shaving cutter and an internal gear held by a work chuck with an intersecting angle, and finishes the tooth surface of the internal gear while rotating at least one of the shaving cutter and the work chuck. There,
The work chuck and the shaving cutter are supported so as to be able to approach and separate in the vertical direction with the work chuck as an upper side, and supported so as to be relatively movable in the horizontal direction.
The work chuck is
It is configured to grip the outer peripheral surface of the internal gear with the rotation axis of the internal gear facing up and down so that the shavings generated during processing by the shaving cutter can fall downward from the internal gear.
Supported by a support that is slidably supported in the vertical direction and is driven up and down by a lift actuator; and
Covered by a coolant splash prevention cover from the front to the left and right sides of the work chuck,
The internal tooth shaving device, wherein the coolant scattering prevention cover is supported by the support so as to be movable in the vertical direction. 2. The internal tooth shaving device according to claim 1, wherein the coolant scattering prevention cover is supported so that a lower end of the cover is movable further downward from the lower end of the work chuck. A main shaft for rotating the work chuck is extended in the vertical direction, the coolant pipe passes through the main shaft in the axial direction and is supported so as not to rotate around the axis, and the coolant discharge port is directed in a predetermined direction. The internal tooth shaving device according to claim 1 or 2, wherein

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