JP6234733B2 - attachment - Google Patents

Description

  The present invention relates to an attachment for processing a shaft portion using a portal machining center suitable for processing of a main body portion in processing of a cutting object having a shaft portion and a main body portion.

  Hydroelectric power generation facilities are provided with guide vanes that adjust the flow rate so that efficient operation can be performed according to the amount of water used. Such a guide vane includes a main body portion having a blade shape (that is, a plate shape having a thickness that is thinner toward both edges), and a shaft portion provided so as to extend from one end surface and the other end surface of the main body portion. Have.

  The conventional guide vane machining methods are: (1) a step of machining the shaft end face using a lathe, and (2) a step of roughing the shaft portion and machining the end of the main body using a lathe. And (3) a step of machining the main body portion using a portal machining center, and (4) a shaft portion is finished using a lathe (that is, the extending direction (angle of the shaft portion with respect to one end surface of the main body portion) , Usually at right angles). The portal machining center is a machine tool in which a structure supporting a main shaft has a gate shape in a front view as disclosed in, for example, JP-A-2005-103694 (Patent Document 1).

  The conventional guide vane processing method has a problem that the ratio of non-processing time such as setup time increases because of many processing steps. Further, in the step of processing the shaft portion, it is necessary to assist the unbalance of the main body portion with a jig, so that there is a problem that a lot of man-hours are spent on the work of attaching the workpiece.

JP 2005-103694 A

  The present inventor uses the attachment for processing the shaft portion by using a portal machining center suitable for processing the main body portion in the processing of the cutting object having the shaft portion and the main body portion, thereby reducing the number of times of setup. It has been found that it can be reduced and that it is not necessary to assist the unbalance of the main body with a jig in the process of processing the shaft.

  Furthermore, the present inventor uses the automatic attachment indexing mechanism for performing the phase indexing of the attachment in addition to the attachment in the machining of the cutting object having the shaft portion and the main body portion. It has been found that it can contribute to improving the accuracy of the coaxiality of a pair of shaft portions extending from both sides of the portion.

  The present invention has been created based on the above findings. An object of the present invention is to provide an attachment for processing the shaft portion using a portal machining center suitable for processing the main body portion in processing of a cutting object having a shaft portion and a main body portion. .

The present invention is an attachment for machining the shaft portion using a portal machining center suitable for machining the main body portion in machining a workpiece having a shaft portion and a main body portion. An attachment main body configured to be attachable to and detachable from the ram, a cylindrical portion supported by the attachment main body through a bearing and supported by the bearing, and a flange at one end of the cylindrical portion A rotating part having a cutting blade support part provided in a shape, an annular rotating part support part provided in the attachment main body part for supporting a cylindrical part of the rotating part, and the cutting blade support of the rotating part A cutting blade mounted on the portion so as to face radially inward, and a U-axis adjusting mechanism for adjusting the position of the cutting blade in the radial direction;
An attachment comprising: a rotary power transmission system that transmits a rotational force of a main shaft of the portal machining center to the rotary unit.

  The attachment of the present invention is usually used by being mounted on a ram of a portal machining center. When the rotational force of the main shaft is transmitted to the rotating part by the rotational power transmission system, the rotating part is rotated around the rotation axis on the attachment main body, and the cutting blade mounted on the rotating part is rotated around the rotation axis. Is turned. By cutting the workpiece set on the table of the portal machining center with the cutting blade that is turning, a shaft portion having an axisymmetric shape with respect to the rotation axis can be machined from the workpiece. Accordingly, it is not necessary to set the work on a lathe, and the shaft portion and the main body can be cut while the work is still set on the table of the portal machining center, so that the number of setups can be reduced. Moreover, it is not necessary to assist the unbalance of the main body portion with a jig in the step of processing the shaft portion, and the processing efficiency can be significantly improved.

Further, the present invention is an attachment for processing the shaft portion using a portal machining center suitable for processing the main body portion in the processing of a cutting object having a shaft portion and a main body portion. Attachment main body configured to be attachable to and detachable from the machining center ram, a cylindrical portion supported by the attachment main body through a bearing and supported by the bearing, and one end of the cylindrical portion A rotating portion having a cutting blade supporting portion provided in a flange shape, an annular rotating portion supporting portion provided on the attachment main body portion and supporting a cylindrical portion of the rotating portion, and the cutting of the rotating portion. A cutting blade mounted on the blade support portion so as to face radially inward, a U-axis adjustment mechanism for adjusting the position of the cutting blade in the radial direction, and a rotational force transmitted to the rotating portion The rotation drive motor and the rotation power transmission system are provided.

  The attachment of the present invention is usually used by being mounted on a ram of a portal machining center. When the rotational force of the rotational drive motor is transmitted to the rotating part by the rotational power transmission system, the rotating part is rotated around the rotation axis on the attachment main body, and the cutting blade mounted on the rotating part is rotated. It is turned around the axis. By cutting the workpiece set on the table of the portal machining center with the cutting blade that is turning, a shaft portion having an axisymmetric shape with respect to the rotation axis can be machined from the workpiece. Accordingly, it is not necessary to set the work on a lathe, and the shaft portion and the main body can be cut while the work is still set on the table of the portal machining center, so that the number of setups can be reduced. Moreover, it is not necessary to assist the unbalance of the main body portion with a jig in the step of processing the shaft portion, and the processing efficiency can be significantly improved.

  Preferably, the U-axis adjustment mechanism includes a U-axis adjustment motor mounted on the attachment main body portion, and is arranged coaxially with the rotation portion outside the rotation portion, and is connected to the rotation portion via a rotation bearing. An annular gear rotatably supported, a first U-axis power transmission system for transmitting the rotational force of the U-axis adjusting motor to the annular gear, and a ball screw mounted on the rotating portion so as to extend in the radial direction A shaft, a second U-axis power transmission system that transmits the rotational force of the annular gear to the ball screw shaft, and a nut that supports the cutting blade and is screwed to the ball screw shaft via a ball for the ball screw shaft. Have. According to such an aspect, the rotational force of the U-axis adjusting motor is transmitted to the annular gear via the first U-axis power transmission system, and the annular gear is rotated coaxially with the rotating portion. When the rotational speed of the annular gear is the same as the rotational speed of the rotating portion, the rotational motion of the annular gear is canceled by the rotational motion of the rotating portion, so that the rotational force of the annular gear is transmitted to the ball screw shaft on the rotating portion. Instead, the nut that supports the cutting blade is stationary on the ball screw shaft. On the other hand, when the rotational speed of the annular gear is different from the rotational speed of the rotating part, the rotational force of the annular gear is transmitted to the ball screw shaft on the rotating part via the second U-axis power transmission system and supports the cutting blade. Is linearly moved on the ball screw shaft. As a result, the radial position of the cutting blade mounted on the rotating portion can be adjusted, and the shaft portion can be stepped, the stepped portion can be rounded, the stepped portion can be chamfered, and the taper shape can be processed. Make it possible. According to such an aspect, since it is possible to realize a configuration in which the U-axis adjustment motor is not turned around the rotation axis together with the cutting blade, the configuration of the U-axis drive system is simplified. Moreover, a balance cut is also possible by adding a second U-axis power transmission system so as to mesh with the annular gear.

  Specifically, when the U-axis adjusting mechanism is not adjusted, the U-axis adjusting motor is synchronized with the rotation of the rotating part so as to cancel the relative rotational movement of the annular gear with respect to the rotating part. The rotational drive can be controlled. According to such an embodiment, the ball screw shaft on the rotating portion is accurately prevented from being rotated by the rotational force of the annular gear without rotating the U-axis adjusting motor around the rotation axis together with the cutting blade. The supported cutting blade can be maintained at a predetermined position in the radial direction.

  Alternatively, when the U-axis adjustment mechanism is not adjusted, the first U is rotated by using the rotation of the rotating part and a predetermined differential device so as to cancel the relative rotational movement of the annular gear with respect to the rotating part. The output shaft of the shaft power transmission system may be rotationally controlled. Even in such an aspect, the ball screw shaft on the rotating portion is accurately prevented from being rotated by the rotational force of the annular gear without turning the U-axis adjustment motor around the rotation axis together with the cutting blade, and supported by the nut. The done cutting blade can be maintained at a predetermined position in the radial direction.

  In this case, preferably, the differential device includes an input gear connected to an output shaft of the U-axis adjusting motor, a first planetary gear meshed with the input gear, and the first gear. A second planetary gear meshed with the planetary gear, and the output shaft of the first U-axis power transmission system is arranged coaxially with the input gear, and one end is meshed with the second planetary gear. And the other planetary gear is engaged with the annular gear, and the carrier of the first planetary gear and the carrier of the second planetary gear are integrated with each other. Have teeth. According to such an aspect, the rotational force of the output shaft of the U-axis adjusting motor is transmitted to the second planetary gear via the input gear and the first planetary gear in order. On the other hand, the rotational force of the rotating part (the turning force around the rotational axis) is transmitted to the second planetary gear through the carrier. Then, the rotational force of the second planetary gear is transmitted to the annular gear via the output shaft of the first U-axis power transmission system. If such an aspect is adopted, the output shaft of the U-axis adjusting motor can be adjusted without turning the U-axis adjusting motor around the rotation axis together with the cutting blade by suitably adjusting the gear ratio of the differential device in advance. When the ball screw shaft is not rotated, the rotation of the ball screw shaft on the rotating portion is accurately prevented by the rotational force of the annular gear, and the cutting blade supported by the nut can be maintained at a predetermined position in the radial direction.

  Preferably, the attachment main body part and the rotating part are provided with a through-hole penetrating coaxially with the rotation axis of the rotating part. According to such an aspect, when the shaft portion is processed, the processed shaft portion passes through the through hole. Thereby, physical interference with a shaft part and an attachment can be avoided.

  Moreover, the present invention is a portal machining center characterized in that an attachment having any one of the above-described features is mounted.

  The present invention also includes a step of machining a shaft portion on a workpiece using the portal machining center having the above characteristics, a step of removing the attachment from the portal machining center, and the portal machining center from which the attachment has been removed. And a step of processing the main body portion of the workpiece.

  The attachment according to one aspect of the present invention is usually used by being mounted on a ram of a portal machining center. When the rotational force of the main shaft is transmitted to the rotating part by the rotational power transmission system, the rotating part is rotated around the rotation axis on the attachment main body, and the cutting blade mounted on the rotating part is rotated around the rotation axis. Is turned. By cutting the workpiece set on the table of the portal machining center with the cutting blade that is turning, a shaft portion having an axisymmetric shape with respect to the rotation axis can be machined from the workpiece. Thereby, it is not necessary to set the work on the lathe, and the shaft portion and the main body portion can be cut while the work is still set on the table of the portal machining center, so that the number of setups can be reduced. Moreover, it is not necessary to assist the unbalance of the main body portion with a jig in the step of processing the shaft portion, and the processing efficiency can be significantly improved.

  The attachment according to another aspect of the present invention is usually used by being attached to a ram of a portal machining center. With the attachment mounted on the ram of the portal machining center, the rotational force of the rotational drive motor is transmitted to the rotating part by the rotational power transmission system, so that the rotating part is rotated around the rotation axis on the attachment main body. At the same time, the cutting blade mounted on the rotating part is turned around the rotation axis. By cutting the workpiece set on the table of the portal machining center with the cutting blade that is turning, a shaft portion having an axisymmetric shape with respect to the rotation axis can be machined from the workpiece. Accordingly, it is not necessary to set the work on a lathe, and the shaft portion and the main body can be cut while the work is still set on the table of the portal machining center, so that the number of setups can be reduced. Moreover, it is not necessary to assist the unbalance of the main body portion with a jig in the step of processing the shaft portion, and the processing efficiency can be significantly improved.

It is a schematic side view which shows the attachment by the 1st Embodiment of this invention. It is a schematic front view of the attachment shown in FIG. FIG. 2 is a schematic front view showing a portal machining center on which the attachment shown in FIG. 1 is mounted. It is a schematic perspective view which shows the cutting target object cut using the portal machining center shown in FIG. FIG. 3 is a cross-sectional view taken along line AA of the attachment shown in FIG. 2. It is the schematic which expands and shows the U-axis adjustment mechanism in the attachment shown in FIG. It is a schematic front view which shows the state in which the cutting tool was attached instead of the attachment in the portal machining center shown in FIG. It is the schematic for demonstrating another example of the U-axis adjustment mechanism in the attachment shown in FIG. It is a schematic side view which shows the attachment by the 2nd Embodiment of this invention.

  Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic side view showing an attachment according to the first embodiment of the present invention, and FIG. 2 is a schematic front view of the attachment. FIG. 3 is a schematic front view showing a portal machining center on which an attachment according to the present embodiment is mounted, and FIG. 4 is a schematic perspective view showing a cutting object to be cut using the portal machining center. .

  As shown in FIG. 4, the cutting object 30 is specifically a guide vane provided in a hydroelectric power generation facility, and includes shaft portions 32 and 33 and a main body portion 31. As shown in FIG. 4, the main body portion 31 has a wing shape (that is, a plate shape that is thinner as it is closer to both edges), and the shaft portions 32 and 33 have one end surface and the other end surface of the main body portion 31. It is provided so that it may extend, respectively.

  As shown in FIG. 3, the portal machining center 20 of the present embodiment includes a bed 23. Two linear guide surfaces 24 are provided on the bed 23 so as to extend horizontally and parallel to each other. On the guide surface 24, a table 22 on which a workpiece is set extends along the guide surface 24. And is slidably mounted.

  Further, as shown in FIG. 3, a column 25 having a gate shape in a front view is installed on the bed 23 so as to straddle the guide surface 24 and the table 22. A saddle 27 that is movable in the left-right direction in a front view is attached on the column 25, and a ram 26 that is movable in the vertical direction is attached to the saddle 27. A main shaft 21 is provided at the lower end of the ram 26 so as to be rotatable around a vertical rotation axis.

  The ram 26 is equipped with the attachment 10 which is a feature of the present invention. In the attachment 10 according to the present embodiment, in the processing of the cutting object 30 having the shaft portion 32 and the main body portion 31 as described above, the shaft portion 32 is formed using the portal machining center 20 suitable for processing the main body portion 31. It is an attachment for processing.

  As shown in FIGS. 1 and 2, the attachment 10 according to the present embodiment includes an attachment main body 11 configured to be detachable with respect to the ram 26 of the portal machining center 20, and a bearing for the attachment main body 11. A rotating part 12 supported rotatably via the rotating part 12, a cutting blade 13 mounted on the rotating part 12 so as to face inward in the radial direction 17, and a U-axis adjustment for adjusting the position of the cutting blade 13 in the radial direction 17 A mechanism 14 and a rotational power transmission system 15 that transmits the rotational force of the main shaft 21 of the portal machining center 20 to the rotating unit 12 are provided. In the present embodiment, as shown in FIGS. 1 and 2, the attachment main body 11 and the rotating part 12 are provided with through holes that penetrate coaxially with the rotation axis of the rotating part 12.

  As shown in FIG. 2, the attachment main body 11 has a rotating part support part 11a having a ring shape in front view, and a ram mounting part 11b extended upward from the upper end part of the rotating part support part 11a. Yes. The distal end portion of the ram mounting portion 11b is configured to be detachable from the ram 26 of the portal machining center 20.

  As shown in FIG. 1, the rotating part 12 is arranged coaxially with the rotating part support part 11 a inside the rotating part support part 11 a and rotates to the rotating part support part 11 a via a rotary bearing (not shown). The cylinder part 12a supported so that it was possible, and the cutting-blade support part 12b provided in the flange shape at the one end part of the said cylinder part 12a are provided.

  FIG. 5 is a cross-sectional view taken along line AA of the attachment 10 shown in FIG.

  As shown in FIG. 5, in the present embodiment, the rotational power transmission system 15 includes a vertical first rotational power transmission shaft 15a and a rotational axis of the rotating unit 12 below the first rotational power transmission shaft 15a. And a third rotational power transmission shaft 15c disposed below the second rotational power transmission shaft 15b and in parallel with the rotational axis of the rotating portion 12. . Each of the first to third rotational power transmission shafts 15a to 15c is supported inside the attachment main body 11 so as to be rotatable around each rotational axis via a rotary bearing.

  Specifically, as shown in FIG. 5, the upper end portion of the first rotational power transmission shaft 15a is configured to be able to be fitted to the main shaft 21 of the portal machining center 20, and the first bevel gear is provided at the lower end portion. It has been. The second rotational power transmission shaft 15b has a second bevel gear meshed with the first bevel gear, and a second spur gear provided coaxially with the second bevel gear. The third rotational power transmission 15c is meshed with an outer peripheral tooth surface 12c provided on at least a part of the cylindrical portion 12a of the rotating portion 12 and a second spur gear of the second rotational power transmission shaft 15b. It has 3 spur gears.

  When the upper end portion of the first rotational power transmission shaft 15a is fitted to the main shaft 21 of the portal machining center 20, the rotational force of the main shaft 21 is transmitted to the first rotational power transmission shaft 15a, whereby the first rotation The power transmission shaft 15a is rotated, the rotational force of the first rotational power transmission shaft 15a is transmitted to the second rotational power transmission shaft 15b, the second rotational power transmission shaft 15b is rotated, and the second rotational power transmission shaft 15b is rotated. The rotational force is transmitted to the third rotational power transmission shaft 15c, the third rotational power transmission shaft 15c is rotated, and the rotational force of the third rotational power transmission shaft 15c is transmitted to the cylindrical portion 12a of the rotating portion 12 to rotate the rotation. The part 12 is rotated.

  The cutting blade 13 is mounted on the cutting blade support portion 12 b of the rotating portion 12 so as to face the inner side in the radial direction 17. By rotating the rotating part 12 around the rotation axis, the cutting blade 13 mounted on the cutting blade support part 12b is turned around the rotation axis.

  As shown in FIG. 5, in the present embodiment, the U-axis adjusting mechanism 14 is arranged coaxially with the rotating unit 12 on the outer side of the rotating unit 12 and the U-axis adjusting motor 41 mounted on the attachment main body 11. An annular gear 42 that is rotatably supported by the rotating part 12 via a rotary bearing, a first U-axis power transmission system 43 that transmits the rotational force of the U-axis adjusting motor 41 to the annular gear 42, and the rotating part 12 The ball screw shaft 44 mounted so as to extend in the radial direction 17, the second U-axis power transmission system 45 for transmitting the rotational force of the annular gear 42 to the ball screw shaft 44, the cutting blade 13 and the ball screw shaft 44. And a nut 46 screwed through the ball screw shaft ball.

  FIG. 6 is an enlarged schematic view showing the U-axis adjusting mechanism 14 in the attachment 10 of the present embodiment.

  As shown in FIG. 6, the U-axis adjustment motor 41 is fixed to the lower end portion of the attachment main body 11 in a state where the output shaft 41 a is directed parallel to the rotation axis of the rotation unit 12.

  In the present embodiment, the first U-axis power transmission system 43 has a differential device 50. As shown in FIG. 6, the differential device 50 specifically includes an input gear 51 connected to the output shaft 41 a of the U-axis adjustment motor 41, a first planetary gear 52 meshed with the input gear 51, And a second planetary gear 54 meshed with the first planetary gear 52.

  The output shaft 43a of the first U-axis power transmission system 43 is arranged coaxially with the input gear 51, with one end meshed with the second planetary gear 54 and the other end meshed with the annular gear 42. Yes. Further, the carrier of the first planetary gear 52 and the carrier of the second planetary gear are integrated (hereinafter, the carrier is denoted by reference numeral 55), and the carrier 55 is an outer peripheral tooth surface of the rotating unit 12. It has external teeth meshed with 12c.

  As shown in FIG. 6, when the rotational force of the U-axis adjusting motor 41 is transmitted to the input gear 51, the input gear 51 is rotated, and the rotational force of the input gear 51 is transmitted to the first planetary gear 52. The first planetary gear 52 is rotated, and the rotational force of the first planetary gear 52 is transmitted to the second planetary gear 54. On the other hand, when the rotational force of the rotating unit 12 is transmitted to the carrier 55, the carrier 55 is rotated, and the rotational force of the carrier 55 is also transmitted to the second planetary gear 54. The second planetary gear 54 is rotated by the resultant force of the rotational force of the first planetary gear 52 and the rotational force of the carrier 55, and the rotational force of the second planetary gear 54 is applied to the output shaft 43 a of the first U-axis power transmission system 43. As a result, the output shaft 43a is rotated, the rotational force of the output shaft 43a of the first U-axis power transmission system 43 is transmitted to the annular gear 42, and the annular gear 42 is rotated.

  In the present embodiment, the gear ratio of the differential device 50 is suitably adjusted in advance, so that the relative position of the annular gear 42 with respect to the rotating portion 12 is maintained without rotating the output shaft 41a of the U-axis adjusting motor 41. The rotational movement is accurately offset.

  As shown in FIG. 6, the second U-axis power transmission system 45 is disposed at right angles to the second power transmission shaft 45 b and the second power transmission shaft 45 b disposed adjacent to and parallel to the ball screw shaft 44. And a first power transmission shaft 45a. Each of the first and second power transmission shafts 45a and 45b is supported inside the rotating portion 12 so as to be rotatable around each rotation axis via a rotary bearing.

  Specifically, as shown in FIG. 6, one end of the first power transmission shaft 45a is engaged with the annular gear 42, and a bevel gear is provided at the other end. The second power transmission shaft 45b has a bevel gear meshed with the bevel gear of the first power transmission shaft 45a, and a spur gear provided coaxially with the bevel gear. The spur gear provided at the end of the ball screw shaft 44 is engaged with the spur gear of the second power transmission shaft 45b.

  As a result, when the rotational speed of the annular gear 42 is different from the rotational speed of the rotating portion 12, the rotational force of the annular gear 42 is transmitted to the first power transmission shaft 45a, and the first power transmission shaft 45a is rotated. The rotational force of the first power transmission shaft 45a is transmitted to the second power transmission shaft 45b, the second power transmission shaft 45b is rotated, and the rotational force of the second power transmission shaft 45b is transmitted to the ball screw shaft 44. The ball screw shaft 44 is rotated. On the other hand, when the rotational speed of the annular gear 42 is the same as the rotational speed of the rotating portion 12, the rotational motion of the annular gear 42 is canceled by the rotational motion of the rotating portion 12 (that is, the annular gear 42 is in relation to the rotating portion 12. Thus, the rotational force of the annular gear 42 is not transmitted to the ball screw shaft 44 on the rotating portion 12.

  As shown in FIG. 6, the cutting blade 13 is supported via a tool post 46a by a nut 46 screwed onto the ball screw shaft 44 via a ball. By rotating the ball screw shaft 44, the nut 46 that supports the cutting blade 13 is linearly moved in the radial direction 17 along the ball screw shaft 44.

  Returning to FIG. 3, the ram 26 according to the present embodiment is provided with an unillustrated indexing mechanism (automatic attachment indexing mechanism) for controlling the orientation (phase) of the attachment 10 with respect to the rotation direction of the main shaft 21. .

  Next, the operation of the present embodiment as described above will be described.

  First, as a first shaft portion machining step, as shown in FIG. 3, the attachment 10 according to the present embodiment is mounted on the ram 26 of the portal machining center 20, and the rotating portion 12 of the attachment 10 is attached by an indexing mechanism (not shown). The rotation axis is directed parallel to the guide surface 24. In this state, the rotational force of the main shaft 21 is transmitted to the rotating unit 12 by the rotational power transmission system 15, whereby the rotating unit 12 is rotated around the rotation axis on the attachment main body 11 and on the rotating unit 12. The mounted cutting blade 13 is turned around the rotation axis.

  Further, when the U-axis adjusting motor 41 of the U-axis adjusting mechanism 14 is operated, the rotation speed of the annular gear 42 is increased or decreased with respect to the rotation speed of the rotating unit 12, so that the diameter of the cutting blade 13 during turning is increased. The position in direction 17 is adjusted. After the cutting blade 13 is positioned at a predetermined position in the radial direction 17, the rotation of the output shaft 41a of the U-axis adjusting motor 41 is stopped. In the present embodiment, the rotation of the rotating portion 12 and the output shaft 43a of the first U-axis power transmission system 43 are controlled to rotate using the predetermined differential device 50, so that the relative position of the annular gear 42 to the rotating portion 12 is increased. Rotating cutting blade 13 is maintained at a predetermined position in the radial direction 17.

  The table 22 is linearly moved along the guide surface 24 toward the attachment 10, and one end surface of the work set on the table 22 is cut by the cutting blade 13 that is turning, so that the rotation axis of the rotating unit 12 is rotated. Axially symmetrical shaft portion 32 is machined from the workpiece. When the position of the cutting blade 13 in the radial direction 17 is adjusted by the U-axis adjusting mechanism 14 during the turning of the cutting blade 13, the shaft portion 32 can be tapered or rounded. The shaft portion 32 to be processed passes through the through-holes formed in the rotating portion 12 and the attachment main body portion 11 according to the linear movement of the table 22.

  After the shaft portion 32 is cut, the table 22 is moved along the guide surface 24, and the workpiece set on the table 22 is retracted from the cutting blade 13 that is turning. The rotation of the main shaft 21 is stopped, and the attachment 10 is removed from the ram 26.

  Next, as the second shaft portion machining step, the table 22 is moved along the guide surface 24 while the work is set on the table 22 and passed below the main shaft 21, so that the first shaft portion machining step is performed. It is moved to the opposite position. The attachment 10 is attached to the ram 26, and the rotation axis of the rotating portion 12 of the attachment 10 is parallel to the guide surface 24 and opposite to the direction of the first shaft portion machining step by an index mechanism (not shown). Directed. In this state, the rotational force of the main shaft 21 is transmitted to the rotating unit 12 by the rotational power transmission system 15, whereby the rotating unit 12 is rotated around the rotation axis on the attachment main body 11 and on the rotating unit 12. The mounted cutting blade 13 is turned around the rotation axis.

  Next, the other end surface of the workpiece set on the table 22 is cut by the turning cutting blade 13 by the same action as in the first shaft portion machining step, and is axisymmetric with respect to the rotation axis of the rotating portion 12. A shaped shaft portion 33 is machined from the workpiece. The shaft portion 33 to be processed passes through the through-holes opened in the rotating portion 12 and the attachment main body portion 11 according to the linear movement of the table 22.

  In the present embodiment, after one shaft portion 32 is machined from the workpiece, the orientation (phase) of the attachment 10 is inverted by 180 ° while the workpiece is set on the table 22, and in this state, the other Since the shaft portion 33 is processed from the workpiece, the other shaft portion 33 can be formed coaxially with the one shaft portion 32. Thereby, when processing the other shaft part 33, the operation | work which centers the workpiece | work becomes unnecessary.

  After the shaft portion 33 is cut, the table 22 is moved along the guide surface 24, and the workpiece set on the table 22 is retracted from the cutting blade 13 that is turning. The rotation of the main shaft 21 is stopped, and the attachment 10 is removed from the ram 26.

  Next, as a main body processing step, as shown in FIG. 7, a cutting tool 29 is attached to the main shaft 21 of the portal machining center 20, and the cutting tool 29 is rotated around a vertical rotation axis by the rotational force of the main shaft 21. . The position of the cutting edge of the cutting tool 29 is adjusted by the saddle 27 and the ram 26, and the table 22 is linearly moved along the guide surface 24, so that the main body 31 has a non-axisymmetric shape (for example, a blade shape). Is cut from the workpiece.

  According to the present embodiment as described above, when the attachment 10 is mounted on the ram 26 of the portal machining center 20, the rotational force of the main shaft 21 is transmitted to the rotating unit 12 by the rotational power transmission system 15. The rotating unit 12 is rotated about the rotation axis on the attachment main body 11, and the cutting blade 13 mounted on the rotating unit 12 is turned about the rotation axis. By cutting the workpiece set on the table 22 of the portal machining center 20 with the cutting blade 13 that is turning, the shaft portion 32 having an axisymmetric shape with respect to the rotation axis can be machined from the workpiece. This eliminates the need to set the workpiece on a lathe and allows the shaft portions 32 and 33 and the main body portion 31 to be cut while the workpiece is still set on the table 22 of the portal machining center 20, thereby reducing the number of setups. it can. Moreover, it is not necessary to assist the unbalance of the main body 31 with a jig in the step of processing the shaft portions 32 and 33, and the processing efficiency can be significantly improved.

  Further, according to the present embodiment, the rotational force of the U-axis adjustment motor 41 is transmitted to the annular gear 42 via the first U-axis power transmission system 43, and the annular gear 42 is rotated coaxially with the rotating portion 12. . When the rotational speed of the annular gear 42 is the same as the rotational speed of the rotating portion 12, the rotational motion of the annular gear 42 is canceled by the rotational motion of the rotating portion 12, so that the rotational force of the annular gear 42 is exerted on the rotating portion 12. The nut 46 that supports the cutting blade 13 is stationary on the ball screw shaft 44 without being transmitted to the ball screw shaft 44. On the other hand, when the rotational speed of the annular gear 42 is different from the rotational speed of the rotating part 12, the rotational force of the annular gear 42 is transmitted to the ball screw shaft 44 on the rotating part 12 via the second U-axis power transmission system 45, The nut 46 that supports the cutting blade 13 is linearly moved on the ball screw shaft 44. Thereby, the position in the radial direction 17 of the cutting blade 13 mounted on the rotating portion 12 can be adjusted, the shaft portions 32 and 33 are stepped, the R processing of the stepped portion, the chamfering processing of the stepped portion, Enables processing of tapered shape and the like. According to such an embodiment, it is possible to realize a configuration in which the U-axis adjustment motor 41 is not rotated around the rotation axis together with the cutting blade 13, and thus the configuration of the U-axis drive system is simplified. Further, by adding the second U-axis power transmission system 45 so as to mesh with the annular gear 42, a balance cut is also possible.

  Further, according to the present embodiment, when the U-axis adjustment mechanism 14 is not adjusted, the output shaft 43a of the first U-axis power transmission system 43 rotates using the rotation of the rotating unit 12 and the predetermined differential device 50. By being controlled and the relative rotational movement of the annular gear 42 with respect to the rotating portion 12 is canceled, the U-axis adjusting motor 41 is rotated by the rotational force of the annular gear 42 without turning the U-axis adjusting motor 41 around the rotation axis. The ball screw shaft 44 on the rotating unit 12 is accurately prevented from rotating, and the cutting blade 13 supported by the nut 46 can be maintained at a predetermined position in the radial direction 17.

  Further, according to the present embodiment, the rotational force of the output shaft 41 a of the U-axis adjustment motor 41 is transmitted to the second planetary gear 54 through the input gear 51 and the first planetary gear 52 in order. On the other hand, the rotational force of the rotating part 12 is transmitted to the second planetary gear 54 via the carrier 55. Then, the rotational force of the second planetary gear 54 is transmitted to the annular gear 42 via the output shaft 43 a of the first U-axis power transmission system 43. In this case, by appropriately adjusting the gear ratio of the differential device 50 in advance, the output shaft 41a of the U-axis adjustment motor 41 can be adjusted without turning the U-axis adjustment motor 41 around the rotation axis together with the cutting blade 13. The rotation of the ball screw shaft 44 on the rotating portion 12 is accurately prevented by the rotational force of the annular gear 42 without being rotated, and the cutting blade 13 supported by the nut 46 is maintained at a predetermined position in the radial direction 17. obtain.

  In addition, according to the present embodiment, the attachment main body 11 and the rotating part 12 are provided with through holes that pass coaxially with the rotation axis of the rotating part 12, so that the shaft parts 32 and 33 are processed. In doing so, the shaft portions 32 and 33 to be processed pass through the through holes. Thereby, physical interference with the shaft parts 32 and 33 and the attachment 10 can be avoided.

  In the present embodiment, as shown in FIG. 6, when the U-axis adjusting mechanism 14 is not adjusted, the rotation of the rotating unit 12 is canceled so as to cancel the relative rotating motion of the annular gear 42 with respect to the rotating unit 12. The output shaft 43a of the first U-axis power transmission system 43 is rotationally controlled using a predetermined differential device 50. However, the present invention is not limited to this. For example, as shown in FIG. The output shaft 41a is connected to the output shaft 43a of the first U-axis power transmission system 43 ′, and cancels the relative rotational motion of the annular gear 42 with respect to the rotating portion 12 when the U-axis adjustment mechanism 14 ′ is not adjusted. As described above, the U-axis adjustment motor 41 may be rotationally driven in synchronization with the rotation of the rotating unit 12.

  Moreover, in this Embodiment, as shown in FIG.1 and FIG.2, although the one cutting blade 13 was mounted on the cutting blade support part 12b of the rotation part 12, it is not limited to this, The rotation part 12 Two or more cutting blades 13 may be mounted on the cutting blade support portion 12b. In this case, for example, when the two cutting blades 13 are mounted opposite to each other on the rotation axis, the shaft portion 32 can be processed by so-called counter cut (balance cut). Alternatively, for example, when the two cutting blades 13 are mounted at different positions with respect to the rotation axis direction, rough cutting of the shaft portion 32 is performed using one cutting blade 13 and the other cutting blade 13 is used. Thus, it is possible to finish the shaft portion 32.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is a schematic side view showing an attachment according to the second embodiment of the present invention.

  As shown in FIG. 9, the attachment 10 ′ according to the second embodiment includes a rotation drive motor 16 that transmits a rotational force to the rotation unit 12 and a rotation instead of the rotation power transmission system 15 in the first embodiment. A power transmission system 15 'is provided.

  Other configurations are substantially the same as those of the first embodiment shown in FIGS. 9, the same parts as those of the first embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 9, the rotation drive motor 16 of the present embodiment is fixed to the upper end portion of the rotation portion support portion 11 a with the output shaft directed parallel to the rotation axis of the rotation portion 12. The rotational power transmission system 15 ′ has, for example, a rotational power transmission shaft (not shown) connected to the output shaft of the rotational drive motor 16, and a spur gear provided coaxially on the rotational power transmission shaft is provided. The outer peripheral tooth surface 12c of the cylindrical portion 12a of the rotating portion 12 is meshed. As a result, the rotational force of the rotational drive motor 16 is transmitted to the cylindrical portion 12a of the rotating portion 12 via the rotational power transmission shaft, and the rotating portion 12 is rotated on the attachment main body 11 around the rotational axis. Yes.

  Also according to the second embodiment as described above, the same effect as the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Attachment 11 Attachment main-body part 11a Rotation part support part 11b Spindle attachment part 12 Rotation part 12a Tube part 12b Cutting blade support part 12c Outer peripheral tooth surface 13 Cutting blade 14 U-axis adjustment mechanism 14 'U-axis adjustment mechanism 15 Rotational power Transmission system 15a First rotational power transmission shaft 15b Second rotational power transmission shaft 15c Third rotational power transmission shaft 15 'Rotational power transmission system 16 Rotation drive motor 17 Radial direction 20 Portal machining center 21 Main shaft 22 Table 23 Bed 24 Guide surface 25 Column 26 Ram 27 Saddle 29 Cutting tool 30 Object to be cut 31 Body portion 32 Shaft portion 33 Shaft portion 41 U-axis adjusting motor 41a U-axis adjusting motor output shaft 42 Annular gear 43 First U-axis power transmission system 43 ′ First U-axis power Transmission system 43a Output shaft 44 of the first U-axis power transmission system Ball screw shaft 45 Second U-axis power transmission System 45a first power transmission shaft 45b second power transmission shaft 46 nut 46a tool rest 50 differential 51 input gear 52 the first planetary gear 54 and the second planetary gears 55 carrier

Claims (9)

In processing a cutting object having a shaft portion and a main body portion, an attachment for processing the shaft portion using a portal machining center suitable for processing the main body portion,
An attachment main body configured to be attachable to and detachable from a ram of a portal machining center, a cylindrical portion supported by the attachment main body through a bearing, and supported by the bearing; and A rotating blade having a cutting blade support provided in a flange shape at one end , and
An annular rotating portion support portion provided in the attachment main body portion and supporting the cylindrical portion of the rotating portion;
A cutting blade mounted on the cutting blade support portion of the rotating portion so as to face radially inward;
A U-axis adjustment mechanism for adjusting the position of the cutting blade in the radial direction;
An attachment comprising: a rotary power transmission system for transmitting a rotational force of a main shaft of the portal machining center to the rotary unit. In processing a cutting object having a shaft portion and a main body portion, an attachment for processing the shaft portion using a portal machining center suitable for processing the main body portion,
An attachment main body configured to be attachable to and detachable from a ram of a portal machining center, a cylindrical portion supported by the attachment main body through a bearing, and supported by the bearing; and A rotating blade having a cutting blade support provided in a flange shape at one end , and
An annular rotating portion support portion provided in the attachment main body portion and supporting the cylindrical portion of the rotating portion;
A cutting blade mounted on the cutting blade support portion of the rotating portion so as to face radially inward;
A U-axis adjustment mechanism for adjusting the position of the cutting blade in the radial direction;
A rotational drive motor and a rotational power transmission system for transmitting rotational force to the rotating part;
An attachment characterized by comprising.

The U-axis adjustment mechanism is
A U-axis adjusting motor mounted on the attachment main body;
An annular gear arranged coaxially with the rotating part outside the rotating part and supported rotatably on the rotating part via a rotating bearing;
A first U-axis power transmission system that transmits the rotational force of the U-axis adjustment motor to the annular gear;
A ball screw shaft mounted on the rotating part so as to extend in the radial direction;
A second U-axis power transmission system for transmitting the rotational force of the annular gear to the ball screw shaft;
A nut that supports the cutting blade and is screwed onto the ball screw shaft through a ball for the ball screw shaft;
The attachment according to claim 1, wherein the attachment is provided. When the U-axis adjusting mechanism is not adjusted, the U-axis adjusting motor is rotationally driven in synchronization with the rotation of the rotating part so as to cancel the relative rotational movement of the annular gear with respect to the rotating part. The attachment according to claim 3. When the U-axis adjusting mechanism is not adjusted, the first U-axis power is utilized by using the rotation of the rotating unit and a predetermined differential device so as to cancel the relative rotational movement of the annular gear with respect to the rotating unit. The attachment according to claim 3, wherein the output shaft of the transmission system is rotationally controlled. The differential is
An input gear connected to the output shaft of the U-axis adjusting motor;
A first planetary gear meshed with the input gear;
A second planetary gear meshed with the first planetary gear;
Have
The output shaft of the first U-axis power transmission system is disposed coaxially with the input gear, and one end is meshed with the second planetary gear and the other end is meshed with the annular gear,
6. The carrier of the first planetary gear and the carrier of the second planetary gear are integrated, and have external teeth meshed with an outer peripheral tooth surface of the rotating portion. The attachment described. The attachment according to any one of claims 1 to 6, wherein a through-hole is formed in the attachment main body portion and the rotation portion so as to penetrate coaxially with a rotation axis of the rotation portion. A portal-type machining center on which the attachment according to claim 1 is mounted. Using the portal machining center according to claim 8 to process a shaft portion on a workpiece;
Removing the attachment from the portal machining center;
Using the portal machining center from which the attachment has been removed, machining the main body into the workpiece;
A processing method characterized by comprising: