WO2013031818A1 - 工作機械および加工方法 - Google Patents
工作機械および加工方法 Download PDFInfo
- Publication number
- WO2013031818A1 WO2013031818A1 PCT/JP2012/071810 JP2012071810W WO2013031818A1 WO 2013031818 A1 WO2013031818 A1 WO 2013031818A1 JP 2012071810 W JP2012071810 W JP 2012071810W WO 2013031818 A1 WO2013031818 A1 WO 2013031818A1
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- WO
- WIPO (PCT)
- Prior art keywords
- guide bush
- workpiece
- main shaft
- eccentric
- axis
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B13/00—Arrangements for automatically conveying or chucking or guiding stock
- B23B13/12—Accessories, e.g. stops, grippers
- B23B13/126—Supports
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B13/00—Arrangements for automatically conveying or chucking or guiding stock
- B23B13/12—Accessories, e.g. stops, grippers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B5/18—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning crankshafts, eccentrics, or cams, e.g. crankpin lathes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B25/00—Accessories or auxiliary equipment for turning-machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B7/00—Automatic or semi-automatic turning-machines with a single working-spindle, e.g. controlled by cams; Equipment therefor; Features common to automatic and semi-automatic turning-machines with one or more working-spindles
- B23B7/02—Automatic or semi-automatic machines for turning of stock
- B23B7/06—Automatic or semi-automatic machines for turning of stock with sliding headstock
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
- B23Q1/72—Auxiliary arrangements; Interconnections between auxiliary tables and movable machine elements
- B23Q1/76—Steadies; Rests
- B23Q1/763—Rotating steadies or rests
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2265/00—Details of general geometric configurations
- B23B2265/12—Eccentric
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/30—Nc systems
- G05B2219/49—Nc machine tool, till multiple
- G05B2219/49313—Machining about eccentric center different from rotational center of workpiece
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/10—Process of turning
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/13—Pattern section
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/19—Lathe for crank or crank pin
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T82/00—Turning
- Y10T82/25—Lathe
- Y10T82/2593—Work rest
- Y10T82/2597—Center rest
Definitions
- the present invention relates to a machine tool and a machining method, and more particularly, to an improvement of an eccentric guide bush.
- a machine tool such as a lathe holds a workpiece such as a round bar (hereinafter referred to as a workpiece) on a main shaft, and works with a tool while rotating the workpiece protruding from the tip of the main shaft. .
- a chucking device for fixing the workpiece to the main shaft is operated, and the axis of the workpiece is offset by a desired amount with respect to the axis of the main shaft (Patent Document 2).
- Japanese Patent Laid-Open No. 10-138007 Japanese Utility Model Publication No.59-12509 Japanese Utility Model Application No.57-107933
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a machine tool and a processing method capable of easily performing an operation when processing an eccentric shape.
- the machine tool and the machining method according to the present invention perform machining of an eccentric shape using an eccentric guide bush that supports a workpiece protruding from the tip of the spindle in a state of being eccentric with respect to the axis of the spindle. This simplifies the operation when machining an eccentric shape.
- the machine tool according to the present invention is characterized in that it includes an eccentric guide bush that supports a workpiece protruding from the tip of the main shaft while being eccentric with respect to the axis of the main shaft.
- the eccentric guide bush it is preferable to switch the eccentric guide bush between a state where the eccentric guide bush is rotated around the axis of the main shaft and a state where it is stopped.
- the machine tool according to the present invention provides a rotation of the eccentric guide bush and a rotation of the main shaft so as to change a phase of the workpiece in a portion of the eccentric guide bush that eccentrically supports the workpiece. It is preferable to adjust the rotation.
- a machining method uses an eccentric guide bush that rotates a spindle around its axis and supports a workpiece protruding from the tip of the spindle in an eccentric state with respect to the axis of the spindle.
- the workpiece is processed.
- the eccentric guide bush it is preferable to switch the eccentric guide bush between a state in which the eccentric guide bush is rotated around the shaft center and a state in which the eccentric guide bush is stopped.
- the rotation of the eccentric guide bush and the rotation of the main shaft so as to change the phase of the workpiece in a portion of the eccentric guide bush that eccentrically supports the workpiece. It is preferable to adjust the rotation.
- FIG. 2A It is a schematic diagram which shows the principal part of the automatic lathe which is specific embodiment of the machine tool which concerns on this invention. It is a figure which shows the switching state (state which rotated the rotary guide bush) when performing eccentric processing, and is a side view (a rotary guide bush is a cross section) equivalent to FIG. It is a figure which shows the switching state (state which rotated the rotary guide bush) in the case of performing eccentric processing, and is a figure by the arrow A in FIG. 2A. It is a figure which shows the switching state (state which stopped the rotary guide bush) in the case of performing normal processing, and is a side view (a rotary guide bush is a cross section) equivalent to FIG.
- FIG. 3A It is a figure which shows the switching state (state which stopped the rotary guide bush) in the case of performing normal processing, and is a figure by arrow A in FIG. 3A. It is a figure which shows the rotary guide bush by which the corner
- FIG. 1 is a schematic view showing a main part of an automatic lathe as an embodiment of a machine tool according to the present invention, and a rotary guide bush 30 (eccentric guide bush) to be described later is a partial sectional view taken along a broken line.
- a rotary guide bush 30 eccentric guide bush
- the automatic lathe includes a spindle 10 that holds a workpiece 200 (workpiece) and is rotatable about an axis C1 thereof, and a spindle motor 20 that rotates the spindle 10 around an axis C1.
- a rotary guide bush 30 that supports the main shaft 10 so that the workpiece 200 projecting from the tip of the main shaft 10 is rotatably supported by the length E in the radial direction with respect to the axis C1 of the main shaft 10;
- a guide bush servomotor 40 (guide bush drive unit) that rotates the guide bush 30 about the axis C1 of the main shaft 10, a state where the rotary guide bush 30 is rotated together with the main shaft 10, and a state where this rotation is stopped.
- the workpiece 200 is formed of a flexible material capable of causing a deflection corresponding to at least an eccentric amount E described later in the range of the distance from the tip of the main shaft 10 to the rotary guide bush 30.
- the spindle 10 is provided with a chucking device (not shown) such as a collet chuck for fixing the workpiece 200 so that the center of the workpiece 200 coincides with the axis C1. Is held in.
- a chucking device such as a collet chuck for fixing the workpiece 200 so that the center of the workpiece 200 coincides with the axis C1. Is held in.
- the control unit 50 includes an input unit 51 to which an instruction to switch between the rotated state and the stopped state described above is input.
- the input unit 51 is input by a user or the like who operates the automatic lathe.
- the control unit 50 controls the rotational drive of the guide bush servomotor 40.
- the control unit 50 synchronizes the rotary guide bush 30 with the main shaft 10 with respect to the guide bush servomotor 40, and the axis C ⁇ b> 1 of the main shaft 10.
- the control unit 50 stops the rotary guide bush 30 with respect to the guide bush servomotor 40. The rotation drive is stopped as follows.
- the control unit 50 also controls the rotational drive of the spindle motor 20, which is a known general control.
- control unit 50 controls the guide bush servomotor 40 to rotate, the rotation synchronized with the rotation of the main shaft motor 20 by referring to the control process of rotating the main shaft motor 20.
- Synchronized rotation means rotation in which the rotational angular velocities of the guide bush servomotor 40 and the spindle motor 20 coincide. Therefore, the guide bush servomotor 40 and the spindle motor 20 do not cause a phase difference during rotation.
- the rotary guide bush 30 has a substantially cylindrical shape, and the outer peripheral surface 31 is rotatably held by the case 35 so that the center of the cylindrical outer peripheral surface 31 is disposed at a position that coincides with the axis C1 of the main shaft 10. Has been.
- the center C2 of the inner peripheral surface 32 of the rotary guide bush 30 is arranged at a position that is eccentric by the above-described eccentric amount E with respect to the axis C1 of the main shaft 10.
- the inner peripheral surface 32 is an outer edge of a hole 32a (a portion that supports the workpiece eccentrically) formed so as to have a radius that allows the outer peripheral surface 200a of the workpiece 200 to loosely contact and pass therethrough.
- the rotation of the workpiece 200 relative to the rotary guide bush 30 is substantially coincident with the center C2 of the inner circumferential surface 32 of the guide bush 30 and between the outer circumferential surface 200a of the workpiece 200 and the inner circumferential surface 32 of the rotary guide bush 30. Is possible.
- the servo motor 40 for the guide bush includes a motor main body 41 and a belt 42 that transmits the rotational driving force generated by the motor main body 41 to the outer peripheral surface 31 of the rotary guide bush 30, and the rotational driving force is generated by the belt 42.
- the rotary guide bush 30 transmitted to the outer peripheral surface 31 rotates around the center of the outer peripheral surface 31 (axial center C1 of the main shaft 10) in synchronization with the main shaft 10.
- the eccentric amount E of the rotary guide bush 30 is a length smaller than the radius of the workpiece 200.
- the control unit 50 controls the main shaft motor 20 to rotate the main shaft 10 around the axis C1 at a predetermined rotational angular velocity, and according to the rotation instruction input to the input unit 51, the rotary guide bush 30.
- the guide bush servomotor 40 is controlled so as to rotate around the center of the outer peripheral surface 31 of the rotary guide bush 30 in the same direction as the main shaft 10 and at the same rotational angular velocity.
- the main shaft 10 rotates about the axis C1 at a predetermined angular velocity
- the rotary guide bush 30 rotates in the same direction as the main shaft 10 around the center of the outer peripheral surface 31 as shown in FIGS. 2A and 2B. Rotates at the same rotational angular velocity.
- the workpiece 200 rotates integrally with the main shaft 10, it is rotated in the same direction as the main shaft 10 and at the same rotation angular velocity.
- the workpiece 200 is decentered by an eccentric amount E with respect to the center of the workpiece 200 (a circular shape whose cross section is centered on the axis C1; FIG. 2A, 2B).
- the control unit 50 controls the main shaft motor 20 to rotate the main shaft 10 around the axis C1 at a predetermined rotational angular velocity, and in accordance with a stop instruction input to the input unit 51, the rotary guide bush 30 Control is performed to stop the servo motor 40 for the guide bush so that the motor is stopped without rotating.
- the rotary guide bush 30 maintains the stopped state shown in FIGS. 3A and 3B, but the workpiece 200 is rotated integrally with the main shaft 10 in the same direction and at the same rotational angular velocity.
- the automatic lathe of the present embodiment when the workpiece 200 is subjected to eccentric machining, it is not necessary to replace or change the chucking device provided in the spindle 10 for eccentric machining. It is possible to save the time and effort required for replacement, and to prevent the processing time from being prolonged due to replacement of the chucking device or the like.
- the spindle 10 is chucked between the case where the workpiece 200 is eccentrically processed and the case where the workpiece 200 is not eccentrically processed (processing into a shape centered on the center of the workpiece 200). It is not necessary to replace and change the king device, and it is not necessary to replace the guide bush that supports the workpiece 200 in the immediate vicinity of the tool 60 with an eccentric rotary guide bush 30 and a general guide bush that is not eccentric.
- the switching between the eccentric machining and the normal machining can be realized by a simple operation of simply switching between rotation and stop of the guide bush servomotor 40, the operability can be improved.
- the machine tool according to the present invention is not limited to this embodiment, and may be a manual lathe or rotated to perform eccentric machining.
- Other types of machine tools may be used as long as they perform normal machining.
- the automatic lathe according to the present embodiment has a chamfered corner portion 34 adjacent to the inner peripheral surface 32 of the end surface 33 of the rotary guide bush 30 on the side facing the main shaft 10. It is preferable to carry out.
- the corner portion 34 and the workpiece 200 move relatively with a strong contact pressure.
- the chamfered corner portion 34 does not have to be the entire ring that is a line of intersection with the inner peripheral surface 32 of the end surface 33, and is a portion corresponding to the direction in which the workpiece 200 is bent, that is, the workpiece 200 is strong. It is only necessary to make contact with the contact pressure.
- the shape of the chamfer is not limited to the shape shown in FIG. 4 which is linear in the cross section (the shape of the inclined surface in the conical shape).
- the shape of the outer peripheral surface 200a of the bent workpiece 200 is It is good also as a shape along.
- the chamfered surface and the outer circumferential surface 200a of the workpiece 200 are in contact with each other over a wide area. Contact is suppressed and the contact pressure can be further reduced.
- the rotary guide bush 30 is driven by the guide bush servomotor 40 and the belt 42 for transmitting the rotational driving force that are separate from the rotary guide bush 30.
- the machine tool and the processing method are not limited to those of this embodiment, and a so-called built-in motor in which a motor for driving the rotary guide bush 30 is integrally incorporated in the rotary guide bush 30 itself is used as a guide bush drive unit.
- the applied configuration can also be adopted.
- a mechanical mechanism (transmission mechanism) for transmitting the rotational driving force of the spindle motor 20 to the rotary guide bush 30 is provided instead of providing a dedicated guide bush servomotor 40 for driving the rotary guide bush 30, a mechanical mechanism (transmission mechanism) for transmitting the rotational driving force of the spindle motor 20 to the rotary guide bush 30 is provided.
- a configuration in which a clutch mechanism that selectively switches between a connected state in which the rotational driving force generated by the main shaft motor 20 is transmitted to the rotary guide bush 30 and a disconnected state in which the rotational driving force is not transmitted may be applied.
- the main shaft motor 20 and the transmission mechanism including the clutch mechanism function as a guide bush drive unit.
- an instruction from the user or the like is input to the input unit 51 of the control unit 50.
- the instruction is not limited to an instruction input manually, but is processed. It may be a command recorded as a part of the program for use.
- NC numerical control
- the state is shifted from the synchronized rotation control state to the single control state of the rotary guide bush 30.
- the rotary guide bush 30 can be stopped by giving a command to that effect, stopping the rotary guide bush 30 at a predetermined rotational angle position, and holding the stopped position.
- the rotary guide bush 30 is rotated around the axis C ⁇ b> 1 of the main shaft 10 in synchronization with the main shaft 10, and the rotary guide bush is operated even when the main shaft 10 rotates.
- eccentric processing and central processing non-eccentric processing
- the tool 60 for machining the workpiece 200 linearly advances and retracts from the outer peripheral surface 200a of the workpiece 200 toward the extension line of the axis C1 of the main shaft 10 with respect to the workpiece 200 supported by the fixed guide bush. Has been placed.
- the cutting edge 60a of the tool 60 is disposed in the same horizontal plane as the axis C1, as shown in FIGS. 5A, 5B, and 5C, for example, and is normal to the outer peripheral surface 200a of the workpiece 200.
- the height position H of the axis C1 of the main shaft 10 and the cutting edge 60a of the tool 60 are made to coincide with each other.
- the rotary guide bush 30 in this embodiment functions as the eccentric guide bush and then functions as the fixed guide bush
- the position of the center C2 of the hole 32a of the rotary guide bush 30 at the end of functioning as the eccentric guide bush As shown in FIGS. 5A and 5B, when the position is on the line connecting the position of the axis C1 and the position of the cutting edge 60a of the tool 60, the center of the workpiece 200 and the tool 60 are used when functioning as a fixed guide bush.
- the height position H coincides with the blade edge 60a.
- the position of the center C2 of the hole 32a of the rotary guide bush 30 at the end of functioning as the eccentric guide bush is the position of the axis C1 and the position of the cutting edge 60a of the tool 60. Is not on the line connecting the two, the height position H along the vertical direction between the center of the workpiece 200 and the cutting edge 60a of the tool 60 does not match when functioning as a fixed guide bush.
- the feed amount toward the axis C1 of the tool 60 and the amount of decrease in the radius of the workpiece 200 do not match.
- the dimensions of the workpiece 200 are not intended.
- the rotary guide bush 30 in the present embodiment functions as a fixed guide bush, it is important to match the height position H between the center of the workpiece 200 and the cutting edge 60a of the tool 60.
- the controller 50 of the guide bush servomotor 40 always stops the rotary guide bush 30 at a fixed position.
- the guide bush is controlled so that the stop position is detected based on the work 200 supported through the hole 32a and the stop position is corrected to a fixed position.
- the drive of the servo motor 40 may be controlled.
- the rotary guide bush 30 is formed at the center C2 of the hole 32a.
- the drive of the servo motor 40 for the guide bush is controlled so as to stop at the rotational position shown in FIG. 5A where the height position H of the tool 60 and the cutting edge 60a of the tool 60 coincide with each other or at the rotational position shown in FIG. 5B.
- the rotational position detector such as a rotary encoder that detects the rotational position of the rotary guide bush 30 and the rotational position detected by this rotational position detector, or the rotational position shown in FIG.
- a control device for controlling the drive of the servo motor 40 for the guide bush so as to stop at the rotated position. It may be Re.
- control device in this configuration may be a control unit 50 that also serves as its function.
- FIG. 5A shows the rotary guide bush 30 based on the detected stop position of the rotary guide bush 30 based on the detected position of the workpiece 200.
- the control device may be configured to control the drive of the servo motor 40 for the guide bush so that the guide bush servomotor 40 is rotated to the rotational position shown in FIG.
- the cutting edge 60a of the tool 60 is applied to any two different points P1, P2 of the outer peripheral surface 200a of the workpiece 200 as shown in FIG. 6A. .
- the coordinates of the two points P1 and P2 hit by the cutting edge 60a are obtained from the movement amount of the tool 60, and the obtained coordinates of the two points P1 and P2 are input to the control unit 50.
- the movement amount of the tool 60 is also detected by the control unit 50.
- the control unit 50 calculates the coordinates of the center of the workpiece 200, that is, the center C2 of the hole 32a, based on the input coordinates of the two points P1 and P2 and the known radius R of the workpiece 200.
- control unit 50 rotates the rotary guide bush 30 by an angle of 180 [degrees] and stops the rotary guide bush 30 as shown in FIG. 6B.
- the cutting edge 60a of the tool 60 is applied to any two different points P3 and P4 on the outer peripheral surface 200a of the workpiece 200 to obtain the coordinates of the two points P3 and P4. , P4 and the known radius R of the workpiece 200, the center of the workpiece 200, that is, the coordinate of the center C2 of the hole 32a is calculated.
- the control unit 50 determines the midpoint between the coordinates of the center C2 (FIG. 6A) of the hole 32a before the rotary guide bush 30 rotates 180 degrees and the coordinates of the center C2 (FIG. 6B) of the hole 32a after the rotation. Is calculated as the coordinate of the axis C1, and based on the coordinate of the axis C1 and the coordinate of the center C2 of the hole 32a before the rotary guide bush 30 rotates 180 degrees, the control unit 50 The rotational position of the guide bush 30 is specified.
- control unit 50 drives the servo motor 40 for the guide bush so as to rotate the rotary guide bush 30 from the identified stop position to the rotation position shown in FIG. 5A or the rotation position shown in FIG. 5B. To control.
- the automatic lathe according to the present embodiment can match the height position H between the center C2 of the hole 32a of the rotary guide bush 30 and the cutting edge 60a of the tool 60.
- the control unit 50 rotates the guide bushing servomotor 40
- at least one of the guide bushing servomotor 40 and the main shaft motor 20 is rotated, thereby rotating the rotary guide.
- the phase between the bush 30 and the workpiece 200 may be shifted, and thereafter the guide bush servomotor 40 and the spindle motor 20 may be controlled to rotate in synchronization.
- control unit 50 controls the drive of the guide bush servomotor 40 and the spindle motor 20 to change the phase between the rotary guide bush 30 and the workpiece 200. Function.
- the controller 50 is supported by the hole 32a of the rotary guide bush 30 by rotating and driving the guide bush servomotor 40 and the spindle motor 20 synchronously as shown in FIG. 7A.
- a machining portion 210 that is eccentric with respect to the center of the workpiece 200 is formed on the workpiece 200 at a predetermined angular position around the center of the workpiece 200, that is, at a position of an angle ⁇ with respect to a horizontal plane passing through the center of the workpiece 200 in the illustrated example. Is done.
- control unit 50 stops both the servo motor 40 for the guide bush and the motor 20 for the main shaft, and then, as shown in FIG. 7B, the work 200 around the center of the work 200 in the hole 32a of the rotary guide bush 30. Only the main shaft motor 20 is rotated by a predetermined angle ⁇ so that the phase is changed by the angle ⁇ , and after the phase is changed, the rotation of the main shaft motor 20 is controlled to stop.
- control unit 50 drives the guide bush servomotor 40 and the spindle motor 20 to rotate synchronously, so that the workpiece 200 supported by the hole 32a of the rotary guide bush 30 as shown in FIG. 7B. Further, a machining portion 220 that is eccentric with respect to the center of the workpiece 200 is formed at a predetermined angular position around the center of the workpiece 200, that is, at a position of an angle ⁇ with respect to a horizontal plane passing through the center of the workpiece 200 in the illustrated example. .
- control unit 50 stops the guide bush servomotor 40 and the spindle motor 20 together, and then, as shown in FIG. 7C, the phase around the center of the workpiece 200 in the hole 32a of the rotary guide bush 30 is angled. Only the main shaft motor 20 is rotated by a predetermined angle ⁇ so as to change only ⁇ , and after the phase is changed, the rotation of the main shaft motor 20 is controlled to stop.
- control unit 50 drives the guide bush servomotor 40 and the spindle motor 20 to rotate synchronously, so that the workpiece 200 supported by the hole 32a of the rotary guide bush 30 as shown in FIG. 7C.
- a machining portion 230 that is eccentric with respect to the center of the workpiece 200 is formed at a predetermined angle ⁇ around the center of the workpiece 200.
- the machining portion 220 obtained by the second machining is in a state where the phase is shifted by an angle ⁇ around the center of the workpiece 200 with respect to the later machining portion 230 by the control of the phase by the control unit 50.
- the rotary guide bush 30 is rotated around the axis C ⁇ b> 1 of the main shaft 10 in synchronization with the main shaft 10, and the workpiece 200 in the hole 32 a of the rotary guide bush 30.
- a plurality of processed portions 210, 220, and 230 having different eccentric directions can be easily formed with one rotary guide bush 30.
- the amount of eccentricity between the processed parts of the workpiece 200 is not limited to the amount of eccentricity E of the rotary guide bush 30 itself by shifting the phase between the rotary guide bush 30 and the workpiece.
- the amount of eccentricity between the processed parts of the workpiece 200 can be set up to twice the amount of eccentricity E of the rotary guide bush 30 itself.
- the amount of eccentricity between the machining parts of the workpiece 200 is set to a range lower than the amount of eccentricity E of the rotary guide bush 30 itself by shifting the phase within a range of less than 60 degrees. You can also.
- processing corresponding to a plurality of eccentric amounts can be performed with only one rotary guide bush 30.
- the processed portion 210 is replenished with the insufficient eccentric amount ⁇ .
- the amount of eccentricity of the processing portion 210 based on the processing portion 220 can be set to a desired amount of eccentricity.
- the phase is set to the processed portion 210 so as to reduce the excess eccentric amount ⁇ .
- the eccentric amount of the processed portion 210 with reference to the processed portion 220 can be set to a desired eccentric amount.
- control unit 50 performs control to rotate the guide bush servomotor 40 and the spindle motor 20 in synchronization with each other, and stops the guide bush servomotor 40 to stop the spindle motor 20. In combination with control for rotationally driving only the processed portions 210, 220, and 230 having phase differences.
- control unit 50 does not stop the guide bush servomotor 40 and performs rotational driving in which the phases of the guide bush servomotor 40 and the spindle motor 20 continuously change.
- the motors 40 and 20 may be controlled.
- the guide bush servomotor 40 is not stopped, and the two motors 40 and 20 are rotationally driven so as to continuously change, thereby discontinuous having a step as shown in FIG. 7C.
- the machining portions 210, 22, and 230 it is possible to form a helically shaped machining portion such as a coiled spring in which the phase between the machining portions continuously changes, or to feed the workpiece 200 in the direction of the axis C ⁇ b> 1.
- the workpiece 200 can be formed into a more complicated three-dimensional shape by controlling the amount and the control unit 50 that adjusts the degree of phase shift between the motors 40 and 20.
- the machine tool according to the present invention only needs to have at least the rotary guide bush 30 that can rotate with the main shaft 10, and the rotary guide bush 30 rotates with the main shaft 10 as described in the above-described embodiment. There is no need to selectively switch between the rotating state and the state where the rotation is stopped.
- the control unit 50 gives a phase difference between the guide bush servomotor 40 and the main shaft motor 20 as in the automatic lathe of the modified example
- the control unit 50 controls the rotary guide bush 30 to the main shaft.
- Rotation of the guide bush servomotor 40 is not controlled so as to selectively switch between the state rotated with the motor 10 and the state where the rotation is stopped, and the guide bush servomotor is controlled with respect to the spindle motor 20.
- the phase difference between the guide bushing servomotor 40 and the spindle motor 20 may be changed by increasing or decreasing the rotational speed of 40.
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Abstract
Description
図1は、本発明に係る工作機械の一実施例としての自動旋盤の要部を示す模式図であり、後述するロータリーガイドブッシュ30(偏心ガイドブッシュ)については破断線によって部分断面図としている。
次に、本実施形態の自動旋盤の作用、効果について説明する。
なお、この自動旋盤の作用は、本発明に係る加工法の一実施形態である。
上述した実施形態の自動旋盤は、制御部50が、ガイドブッシュ用サーボモータ40を回転させるときは、ガイドブッシュ用サーボモータ40を主軸用モータ20と同期するように回転させる制御を行うが、本発明に係る工作機械は、この形態に限定されるものではない。
20 主軸用モータ(主軸駆動部)
30 ロータリーガイドブッシュ(偏心ガイドブッシュ)
32a 孔(被工作物を偏心して支持する部分)
40 ガイドブッシュ用サーボモータ(ガイドブッシュ駆動部)
50 制御部(制御部、位相制御部)
200 ワーク(被工作物)
C1 軸心
C2 中心
E 長さ、偏心量
Claims (9)
- 主軸の先端から突出した被工作物を前記主軸の軸心に対して偏心した状態で支持する偏心ガイドブッシュを備えたことを特徴とする工作機械。
- 前記偏心ガイドブッシュを、前記主軸の前記軸心回りに回転させた状態と停止させた状態とに切り替えることを特徴とする請求項1に記載の工作機械。
- 前記主軸をその軸心回りに回転させる主軸駆動部と、前記偏心ガイドブッシュを前記軸心回りに回転させるガイドブッシュ駆動部と、前記偏心ガイドブッシュを前記主軸に同期させて前記軸心回りに回転させた状態と前記偏心ガイドブッシュを停止させた状態とに切り替えるように前記ガイドブッシュ駆動部を制御する制御部と、を備えたことを特徴とする請求項2に記載の工作機械。
- 前記偏心ガイドブッシュの、前記被工作物を偏心して支持する部分における、前記被工作物の位相を変更するように、前記偏心ガイドブッシュの回転と前記主軸の回転とを調整することを特徴とする請求項1から3のうちいずれか1項に記載の工作機械。
- 前記主軸を前記軸心回りに回転させる主軸駆動部と、前記偏心ガイドブッシュを前記軸心回りに回転させるガイドブッシュ駆動部と、前記偏心ガイドブッシュの、前記被工作物を偏心して支持する部分における、前記被工作物の位相を変更するように、前記主軸駆動部と前記ガイドブッシュ駆動部とのうち少なくとも一方を制御する位相制御部と、を備えたことを特徴とする請求項4に記載の工作機械。
- 前記偏心ガイドブッシュの端面のうち前記主軸に向いた側の端面の、前記被工作物を支持する内周面と隣接する角部に、面取りが施されていることを特徴とする請求項1から5のうちいずれか1項に記載の工作機械。
- 主軸をその軸心回りに回転させるとともに、前記主軸の先端から突出した被工作物を前記主軸の軸心に対して偏心した状態で支持する偏心ガイドブッシュを用いて、前記被工作物に対する加工を施すことを特徴とする加工方法。
- 前記偏心ガイドブッシュを、前記主軸の前記軸心回りに回転させた状態と前記偏心ガイドブッシュを停止させた状態とに切り替えることを特徴とする請求項7に記載の加工方法。
- 前記偏心ガイドブッシュの、前記被工作物を偏心して支持する部分における、前記被工作物の位相を変更するように、前記偏心ガイドブッシュの回転と前記主軸の回転とを調整することを特徴とする請求項7または8に記載の加工方法。
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US14/241,698 US9463512B2 (en) | 2011-08-31 | 2012-08-29 | Machine tool and machining method |
CN201280033968.3A CN103648690B (zh) | 2011-08-31 | 2012-08-29 | 机床以及加工方法 |
ES12826693.9T ES2693510T3 (es) | 2011-08-31 | 2012-08-29 | Máquina herramienta y procedimiento de mecanizado |
JP2013531350A JP6245984B2 (ja) | 2011-08-31 | 2012-08-29 | 工作機械および加工方法 |
EP12826693.9A EP2752262B1 (en) | 2011-08-31 | 2012-08-29 | Machine tool and machining method |
KR1020137034048A KR101539523B1 (ko) | 2011-08-31 | 2012-08-29 | 공작 기계 및 가공 방법 |
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US (1) | US9463512B2 (ja) |
EP (1) | EP2752262B1 (ja) |
JP (1) | JP6245984B2 (ja) |
KR (1) | KR101539523B1 (ja) |
CN (1) | CN103648690B (ja) |
ES (1) | ES2693510T3 (ja) |
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JP2017170570A (ja) * | 2016-03-24 | 2017-09-28 | シチズン時計株式会社 | ガイドブッシュ装置 |
JP2021003793A (ja) * | 2019-06-27 | 2021-01-14 | シチズン時計株式会社 | 工作機械および加工方法 |
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EP3363567B1 (en) * | 2015-11-17 | 2022-08-31 | Citizen Watch Co., Ltd. | Machine tool and method for machining using machine tool |
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CN112664563A (zh) * | 2020-11-23 | 2021-04-16 | 东风锻造有限公司 | 一种提升大型热模锻压力机主轴瓦寿命的方法 |
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Also Published As
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US9463512B2 (en) | 2016-10-11 |
JPWO2013031818A1 (ja) | 2015-03-23 |
EP2752262A1 (en) | 2014-07-09 |
JP6245984B2 (ja) | 2017-12-13 |
US20140202294A1 (en) | 2014-07-24 |
KR20140023397A (ko) | 2014-02-26 |
CN103648690B (zh) | 2016-10-12 |
EP2752262A4 (en) | 2015-04-29 |
TW201328799A (zh) | 2013-07-16 |
CN103648690A (zh) | 2014-03-19 |
KR101539523B1 (ko) | 2015-07-24 |
ES2693510T3 (es) | 2018-12-12 |
EP2752262B1 (en) | 2018-09-19 |
TWI556890B (zh) | 2016-11-11 |
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