JP2011152617A - Work supporting device and work machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a work supporting device capable of supporting a work with a predetermined phase in a short time in a work machining device in which the work is supported on both side headstocks. <P>SOLUTION: This work supporting device includes a first support device 30R and a second support device 30L which are disposed on a work rotating axis so as to face each other and which support the work from both ends and a control means for controlling the both support devices 30R, 30L. The first support device 30R includes a first holding means 33R, a first spindle motor 32RM, a fitting member 35R formed at one end of the work, and a pressing means 36R for pressing the fitting member 35R to the second support device 30L side. The second support device 30L includes a second holding means 33L and a second spindle motor 32LM. The control means rotates the work relative to the fitting member 35R to fit the work to the fitting member, and controls the phase of the fitting member 35R to support the work with a predetermined phase. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a workpiece support device and a processing device capable of rotating and supporting a rod-shaped workpiece around a rotation axis.

  Conventionally, when grinding a rod-shaped workpiece (workpiece) such as a steering rod of an electric power steering apparatus (hereinafter referred to as EPS), a processing apparatus as disclosed in Patent Document 1 below is used. In Patent Document 1, a fitting member is fitted into a positioning groove formed on one end surface of a workpiece to determine the phase of the workpiece with respect to the processing apparatus, and a rack portion formed on the side peripheral surface has a predetermined portion. A machining apparatus for rotating a workpiece so as to face a direction is disclosed.

  As a result, the processing apparatus of Patent Document 1 supports the workpiece with the chuck portion in a state in which the workpiece is in a predetermined phase. Therefore, even if a rack portion or the like is formed in a portion to be supported, the workpiece is prevented from being phased. Can be properly supported.

JP 2009-72842 A

However, problems still remain in such a processing apparatus.
In the processing apparatus of Patent Document 1, the workpiece is set on the temporary support base in accordance with the phase of the positioning groove with the phase of the fitting member, and the spindle devices arranged on both sides of the workpiece are moved in directions close to each other. By fitting the workpiece from both ends, the fitting member was fitted into the positioning groove of the workpiece. At this time, the setting of the work on the temporary cradle is subject to visual confirmation by the operator and manual adjustment, which is a troublesome work requiring time.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a workpiece support device that can set a workpiece reliably in a short time without requiring troublesome work, and such a device. It is providing the processing apparatus provided with the workpiece support apparatus.

  The invention according to claim 1, which is provided to solve the above problem, includes a first support device that supports one end in the axial direction of a workpiece disposed on a workpiece rotation shaft, and the first support device. A second support device disposed opposite to support the other end of the workpiece in the axial direction; and the first support device and a control means for controlling the second support device, the first support device comprising: A first gripping means for gripping one end of the work, a first servo motor for rotating the first gripping means about the workpiece rotation axis, and a fitting groove formed at one end of the work. And a biasing means for biasing the fitting piece toward the second support device, and the second support device includes second gripping means for gripping the other end of the workpiece. A second servo motor for rotating the second gripping means about the workpiece rotation axis; The control means rotates the work relative to the fitting piece, fits the fitting piece into the fitting groove of the work, and controls the phase of the fitting piece. A workpiece support device that supports the workpiece at a predetermined phase.

  According to the workpiece support device, when the workpiece is set in the machining device, the workpiece is relatively rotated with respect to the fitting piece, so that the fitting piece is fitted into the fitting groove of the workpiece, and the workpiece is predetermined. It can be supported by the phase. This eliminates the need for labor that is required in the prior art to support the workpiece and the fitting piece after matching the phase of the workpiece and the phase of the fitting piece by visual inspection and manual operation. Further, the efficiency of the work set can shorten the overall cycle time including the machining cycle.

  A second aspect of the present invention is the workpiece support device according to the first aspect, wherein the control means turns off the first servo motor in a state where the first gripping means does not grip the workpiece. And performing a fitting step of turning on the second servomotor in a state where the second gripping means grips the workpiece, thereby rotating the workpiece relative to the fitting piece. It is the workpiece support device characterized.

  When the work piece is rotated relative to the fitting piece and the fitting piece is fitted into the fitting groove of the work piece, the first servo motor may rotate due to the impact force at the time of fitting, resulting in a positional deviation. There is. At this time, if the first servo motor remains in the servo-on state, the servo system of the first servo motor detects the generated position deviation as an abnormality. Therefore, the workpiece support device according to the present invention is configured such that when the fitting piece is fitted into the fitting groove of the workpiece, the first servo motor is set in a servo-off state in advance so that the first servo motor is affected by the impact at the time of fitting. The servo system can be prevented from detecting an abnormality.

  Invention of Claim 3 is a workpiece support apparatus of Claim 2, Comprising: While the said control means turns on the said 1st servomotor, the said 1st holding means hold | grips the said workpiece | work The second servo motor is turned on, and the second gripping means grips the workpiece. The workpiece is rotated by the first servo motor and the second servo motor. The workpiece supporting device is characterized in that the fitting step is executed after rotating around.

  According to the workpiece support device, the fitting piece can be fitted into the fitting groove of the workpiece in a more efficient and short time.

  A fourth aspect of the present invention is the workpiece support device according to the third aspect, wherein the control means reverses the rotation direction of the second servo motor in the fitting step. It is a workpiece support device.

  According to the workpiece support device described above, by reversing the rotation direction of the second servo motor, the speed of relative rotation of the workpiece with respect to the fitting piece is increased, and the fitting can be performed more efficiently and in a short time.

  A fifth aspect of the present invention is the workpiece support device according to any one of the first to fourth aspects, further comprising rotational braking means for braking the rotation of the first gripping means, wherein the control means is the fitting In the combined step, the rotation of the first gripping means is braked by the rotation braking means.

  According to the workpiece support device described above, the rotation of the first gripping means is braked by the rotation braking means, so that the fitting piece is prevented from being accompanied with the work and can be fitted more efficiently and in a short time. Can do.

  A sixth aspect of the present invention is the workpiece support device according to the fifth aspect, wherein the rotational braking means is a resistor arranged directly or indirectly on the outer periphery of the rotational shaft of the first servomotor. And a pressing unit that presses the resistance member from the outside in the radial direction to the inside, and the control unit brakes rotation of the first gripping unit by controlling a pressing state by the pressing unit. It is the workpiece support device characterized.

  According to the workpiece support device, the resistance member arranged directly on the outer periphery of the rotation shaft of the first servo motor or indirectly through another member is pressed from the radially outer side to the inner side, By braking the rotation of the first gripping means, it is possible to suppress the rotation with the workpiece and to make the fitting more efficient and in a short time.

  The invention according to claim 7 is pressed against the workpiece supporting device according to any one of claims 1 to 6 and the workpiece supported by the workpiece supporting device, and against the workpiece. A machining tool for machining the workpiece by relative movement, wherein the first gripping means and the second gripping means are chucks capable of sandwiching and gripping the workpiece from a side surface of the workpiece. The control means is a processing apparatus that performs processing after the workpiece is supported at a predetermined phase.

  According to the above processing apparatus, when the work is set on the processing apparatus, the work can be reliably supported in a predetermined phase in a short time, which can contribute to shortening the entire cycle time including the processing cycle.

  If the workpiece support device and the machining device according to the present invention are used, a work can be reliably set in a short time without requiring a troublesome work.

It is a top view which shows the external appearance of the processing apparatus which concerns on this embodiment. It is explanatory drawing which shows the workpiece support apparatus with which the processing apparatus of FIG. 1 is provided. It is sectional drawing of the 1st main axis | shaft apparatus with which the processing apparatus of FIG. 1 is provided. (A) is the perspective view which shows the workpiece | work W in this embodiment, (B) is the arrow view which looked at the workpiece | work W of (A) from BB direction, (C) is positioning of the workpiece | work W It is a figure explaining a mode that a fitting member fits into a slot. It is a flowchart which shows the operation | movement which sets the workpiece | work in a processing apparatus.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments in which the invention is embodied in a processing apparatus will be described with reference to the drawings.
FIG. 1 is a plan view showing the external appearance of the machining apparatus according to the present embodiment, and FIG. 2 is an explanatory view showing a workpiece support device provided in the machining apparatus of FIG. FIG. 3 is a cross-sectional view of a spindle device provided in the workpiece support device of FIG. 1 and 2, the Y-axis direction indicates a vertically upward direction, and the X-axis direction and the Z-axis direction indicate horizontal directions. The X-axis direction indicates a direction orthogonal to the rotation axis (workpiece rotation axis CZ) of the workpiece W, and the Z-axis direction indicates a direction parallel to the rotation axis of the workpiece W. 4A to 4C are explanatory views showing a schematic shape of a work set in the processing apparatus of FIG. 4A is a perspective view of the entire workpiece W, and FIG. 4B is an arrow view of the workpiece W of FIG. 4A viewed from the BB direction. FIG. 4C is an arrow view of the workpiece W of FIG. 4A viewed from the CC direction, and shows how the fitting piece is fitted into the fitting groove MK formed in the workpiece W. Yes.

  As shown in FIG. 4A, the work W is a long and narrow substantially cylindrical member. The workpiece W includes a threaded portion K in which a spiral thread groove is formed in the circumferential direction in a part of the longitudinal direction, and a part of a cylindrical surface different from the threaded portion K is processed into a planar shape. And a rack portion J formed with. A fitting groove MK is formed on at least one end surface of the workpiece W. The fitting groove MK of the present embodiment is formed on the end surface near the rack portion J in parallel with the plane of the rack portion J on which teeth are formed.

[Configuration of processing equipment]
As shown in FIG. 1, the processing apparatus 1 (grinding machine) of this embodiment includes a bed 2, a first spindle apparatus 30R (first support apparatus), a second spindle apparatus 30L (second support apparatus), The grindstone support device 10, a truing device 60, and a control device 50 (control means) are included.

  The bed 2 has a substantially rectangular shape and is arranged on the floor. On the upper surface of the bed 2, a set of two grinding wheel table guide rails GZ, a first guide rail GR, and a second guide rail GL that extend in the Z-axis direction are formed. The two rails constituting the first guide rail GR are formed so as to be arranged on the same straight line as the corresponding rails of the second guide rail GL. Further, the grinding wheel table guide rail GZ is arranged side by side with the first guide rail GR and the second guide rail GL in the X-axis direction. A grinding wheel support device 10, a first spindle device 30R, and a second spindle device 30L are slidably disposed on the grinding wheel base guide rail GZ, the first guide rail GR, and the second guide rail GL, respectively. The

  The bed 2 also includes a Z-axis moving device 120, a first moving device 130R, and a second moving device that move the grindstone support device 10, the first spindle device 30R, and the second spindle device 30L in the Z-axis direction. 130L is attached to each. Each of the Z-axis moving device 120, the first moving device 130R, and the second moving device 130L is disposed below the grinding wheel base guide rail GZ, the first guide rail GR, and the second guide rail GL.

  The Z-axis moving device 120 includes a Z-direction screw shaft (not shown) extending in the Z-axis direction, a Z-axis nut (not shown) arranged on the outer periphery of the Z-direction screw shaft and connected to the grindstone support device 10. , A plurality of balls (not shown) disposed between the Z-direction screw shaft and the Z-axis nut, a Z-axis motor 10M that rotates the Z-direction screw shaft, and a Z that detects the rotation angle of the Z-axis motor 10M Shaft detection means 10E (encoder or the like). The Z-axis motor 10M is a servo motor that is driven and controlled by the servo system of the control device 50, and a detection signal from the Z-axis detection means 10E is input to the control device 50. The control device 50 takes in the detection signal from the Z-axis detection means 10E, and outputs a drive signal for controlling the position and moving speed of the Z-axis nut connected to the grindstone support device 10 to the Z-axis motor 10M.

  Similarly, the first moving device 130R includes a first screw shaft (not shown) extending in the Z-axis direction, and a first nut (not shown) arranged on the outer periphery of the first screw shaft and connected to the first main shaft device 30R. A plurality of balls (not shown) disposed between the first screw shaft and the first nut, a first motor 30RM for rotating the first screw shaft, and a rotation angle of the first motor 30RM. First detecting means 30RE (encoder or the like) for detecting. The second moving device 130L includes a second screw shaft (not shown) extending in the Z-axis direction and a second nut (not shown) that is disposed on the outer periphery of the second screw shaft and connected to the second main shaft device 30L. ), A plurality of balls (not shown) disposed between the second screw shaft and the second nut, a second motor 30LM for rotating the second screw shaft, and a rotation angle of the second motor 30LM. Second detection means 30LE (encoder or the like) for detection.

  The first and second motors 30RM and 30LM are servomotors that are driven and controlled by the servo system of the control device 50. Detection signals from the first and second detection means 30RE and 30LE are input to the control device 50. The control device 50 takes in detection signals from the first and second detection means 30RE and 30LE, and positions and moving speeds of the first and second nuts connected to the first and second spindle devices 30R and 30L, respectively. Is output to each of the first and second motors 30RM and LM.

  Thus, since the first main spindle device 30R and the second main spindle device 30L are opposed to each other on the bed 2, the machining apparatus 1 moves the first main spindle device 30R and the second main spindle device 30L in directions close to each other. Thus, the workpiece W can be sandwiched and supported from both sides in the axial direction. In addition, temporary beds 73 and 74 for temporarily holding the workpiece W are disposed on the bed 2 between the first spindle device 30R and the second spindle device 30L.

  The first spindle device 30R includes a first spindle stock 31R, a first spindle 32R, a first chuck 33R, a first spindle motor 32RM, and first spindle detection means 32RE. The first head stock 31R is slidably disposed on the first guide rail GR in a state of being connected to the first nut of the first moving device 130R. The first spindle stock 31R has a first spindle hole 34R extending in the Z-axis direction while being disposed on the first guide rail GR. The first main shaft 32R is rotatably inserted and supported in the first main shaft hole 34R.

  As shown in FIG. 3, a first chuck 33R that holds one end of the workpiece W in the axial direction is attached to one end of the first main shaft 32R. The first chuck 33R is an air chuck that is opened and closed by air pressure of air supplied from an air supply source (not shown) such as a compressor. The first chuck 33R is supplied with air from an air supply source via a supply passage 39R formed in the first main shaft 32R. A plurality of piston ring type seals 38R are arranged on the outer periphery of the first main shaft 32R, and a space (not shown) into which air supplied from an air supply source is introduced radially outward of the seals 38R. Is formed. Thereby, the first spindle device 30R presses the seal 38R from the radially outer side to the inner side with the air supplied from the air supply source, and suppresses the free rotation of the first spindle 32R by the frictional resistance of the pressed seal 38R. . The air supplied to the radially outer side of the seal 38R is shared with the air supplied for driving the first chuck 33R. When the first chuck 33R is in an open state (unclamped), the first main shaft 32R is pressed against the seal 38R by the operating pressure of the supplied air, so that free rotation is suppressed by the frictional resistance of the seal 38R. On the other hand, when the first chuck 33R is in the gripping state (clamp), the pressing of the seal 38R is released, so that the first main shaft 32R can freely rotate relative to the first main shaft base 31R.

  A first insertion hole 34R into which the workpiece W is inserted is formed on the first chuck 33R side of the first main shaft 32R. A fitting member 35R and an adjustment member 37R that rotate integrally with the first main shaft 32R are provided in the first insertion hole 34R. The fitting member 35R urges the fitting piece MC to be fitted into the fitting groove MK of the workpiece W and the fitting piece MC toward the first chuck 33R (in the direction of fitting to the fitting groove MK of the workpiece W). And an elastic member 36R. The adjustment member 37R adjusts the Z-axis direction position of the fitting member 35R in the first main shaft 32R based on a control signal from the control device 50. Further, the fitting member 35R is provided with a proximity sensor (not shown) that detects the fitting state of the fitting piece MC.

  The second spindle device 30L includes a second spindle stock 31L, a second spindle 32L, a second chuck 33L, a second spindle motor 32LM, a second spindle detection means 32LE, and an adjustment member 37L. It is the same as the first spindle device 30R, and is different from the first spindle device 30R in that a contact member 35L is disposed in the second spindle hole 34L of the second spindle 32L instead of the fitting member 35R. The contact member 35L is a member on a disk, and can control the position in the Z-axis direction within the second main shaft 32L by the adjustment member 37L based on a control signal from the control device 50. The second headstock 31L is slidably disposed on the second guide rail GL in a state where it is connected to the second nut of the second moving device 130L. The main spindle rotating shaft of the second main spindle 32L is the same as that of the first main spindle 32R of the first main spindle apparatus 30R arranged on the first guide rail GR in a state where the second main spindle apparatus 30L is arranged on the second guide rail GL. It is located coaxially with the main shaft rotation axis (workpiece rotation axis).

Each of the first and second spindles 32R and 32L is rotationally driven by each of the first and second spindle motors 32RM and 32LM, and each of the first and second spindle detection means 32RE and 32LE is the first and second spindles. The rotation angles of the spindle motors 32RM and 32LM are detected. The first and second spindle motors 32RM and 32LM are servo motors that are driven and controlled by the servo system of the control device 50. Detection signals from the first and second spindle detection means 32RE and 32LE are input to the control device 50. The The control device 50 takes in the detection signals from the first and second detection means 32RE and 32LE, and outputs a drive signal for controlling the phase, rotation and rotation of the first and second spindles 32R and 32L to the first and second spindles. Output to the motors 32RM and 32LM. The control device 50 controls the opening and closing of the first and second chucks 33R and 33L by controlling the amount of air supplied from the air supply source.
2, the fitting members 35R, the adjustment members 37R and 37L, and the contact members 35L provided in the first main shaft 32R and the second main shaft 32L are indicated by solid lines instead of dotted lines. Yes.

  As shown in FIG. 1, the grindstone support device 10 includes a grindstone base traverse base 11 and a grindstone base 20. The wheel head traverse base 11 is formed in a rectangular flat plate shape, and is slidably disposed on the wheel head guide rail GZ while being connected to the Z-axis nut of the Z-axis moving device 120. Further, a pair of X-axis guide rails GX extending in the X-axis direction are formed on the upper surface of the grinding wheel base traverse base 11 in a state where the grinding wheel base traverse base 11 is disposed on the grinding wheel base guide rail GZ. A grinding wheel base 20 is disposed on the X-axis guide rail GX. Furthermore, an X-axis moving device 140 that moves the grinding wheel base 20 along the X-axis guide rail is attached below the X-axis guide rail GX in the grinding wheel base traverse base 11.

  The X-axis moving device 140 is disposed on the outer periphery of the X-direction screw shaft (not shown) that extends in the X-axis direction in a state where the grindstone table traverse base 11 is disposed on the grindstone table guide rail GZ. An X-axis nut (not shown) connected to the grinding wheel base 20, a plurality of balls (not shown) arranged between the X-direction screw shaft and the X-axis nut, and the X-direction screw shaft are rotated. An X-axis motor 20M and X-axis detection means 20E (such as an encoder) for detecting the rotation angle of the X-axis motor 20M are provided. The X-axis motor 20M is a servo motor that is driven and controlled by the servo system of the control device 50, and a detection signal from the X-axis detection means 20E is input to the control device 50. The control device 50 takes in the detection signal from the X-axis detection means 20E, and outputs a drive signal for controlling the position and moving speed of the X-axis nut connected to the grindstone base 20 to the X-axis motor 20M. Therefore, the grindstone table 20 can be moved relative to the bed 2 and the first and second spindle devices 31R and 31L in the X-axis direction and the Z-axis direction.

  The grinding wheel base 20 includes a grinding wheel rotating motor 21, a disk-shaped grinding wheel 22, a grinding wheel rotating shaft member 23 that passes through the center of the grinding wheel 22, and a grinding wheel rotating shaft member 23 that rotates the grinding wheel rotating motor 22. And a transmission mechanism 24 for transmitting to The grindstone table 20 is formed with a through-hole penetrating the grindstone table 20 in the Z-axis direction in a state where the grindstone table 20 is arranged as shown in FIG. A grinding wheel rotating shaft member 23 is rotatably supported in the through hole of the grinding wheel base 20. A grinding wheel 22 is coaxially attached to one end of the grinding wheel rotating shaft member 23, and a pulley (not shown) constituting the transmission mechanism 24 is attached to the other end. The grindstone rotating motor 21 is fixed to the upper surface of the grindstone table 20, and a pulley (not shown) constituting the transmission mechanism 24 is attached to the rotating shaft of the grindstone rotating motor 21. And the belt 25 is suspended by the pulley of the grinding wheel rotating shaft member 23 and the pulley of the grinding wheel rotating motor 21, and the transmission mechanism 24 of this embodiment is formed. The control device 50 can control the rotational driving of the grinding wheel 22 by outputting a driving signal to the grinding wheel rotating motor 21.

  The truing device 60 is disposed on the bed 2 between the grinding wheel table guide rail GZ and the second guide rail GL. The truing device 60 is supported by the truing table 61 supported by the bed 2 so as to be able to turn around the vertical axis (Y axis) with respect to the bed 2 and supported by the truing table 61 so as to be rotatable around the horizontal axis. The formed grinding wheel 62 is provided. The forming grindstone 62 has a disk shape and is rotationally driven by the control device 50 in order to form the outer peripheral surface of the grinding wheel 22. The outer peripheral edge of the forming grindstone 62 is formed in an acute angle shape. That is, the outer peripheral surface of the grinding wheel 22 can be formed by appropriately moving the grinding wheel base 20 in the X-axis direction and the Z-axis direction while turning the forming grindstone 62 around the vertical axis.

[Workset method]
Next, a work setting method for the machining apparatus 1 of the present embodiment will be described with reference to the flowchart of FIG.
In order to set the workpiece W on the processing apparatus 1, first, the workpiece W is placed on the temporary support bases 73 and 74, and the first and second chucks 33R and 33L disposed on both sides of the workpiece W are opened (unclamped). State. (Step S1)
Next, the control device 50 sandwiches and supports the workpiece W from both ends by moving the first and second spindle devices 30R and 30L disposed on both sides of the workpiece W in directions close to each other in the Z-axis direction. . At this time, the workpiece W may have an arbitrary phase, and the phase of the fitting piece 35R provided in the first chuck 33R may also be an arbitrary phase. (Step S2)
Next, the control device 50 outputs a servo-off signal to the first spindle motor 32RM of the first spindle device 30R, and puts the first spindle motor 32RM in a servo-off state. When the first spindle motor 32RM is in the servo-off state, the motor shaft of the first spindle motor 32RM can freely rotate. (Step S3)
Further, the control device 50 outputs a gripping (clamping) signal to the second chuck 33L so that the workpiece W is gripped by the second chuck 33L. (Step S4)
Next, the control device 50 activates the second spindle motor 32LM of the second spindle device 30L to rotate the gripped workpiece W around the spindle rotation axis (workpiece rotation axis). (Step S5)
At this time, the first main shaft 32R is restrained from being rotated with the workpiece W by the frictional resistance of the seal 38R by the operating pressure that opens (unclamps) the first chuck 33R. Therefore, the workpiece W rotates relative to the fitting piece MC while the end surface provided with the fitting groove MK is brought into sliding contact with the fitting piece MC of the fitting member 35R. When the phase of the fitting groove MK matches the phase of the fitting piece MC, the fitting piece MC is fitted into the fitting groove MK. At this time, the proximity sensor provided on the fitting member 35R detects the fitting state of the fitting piece MC and outputs a fitting signal to the control device 50 (fitting signal ON).
Next, the control device 50 determines whether the fitting signal is turned on. (Step S6) If it is determined in step S6 that the fitting signal is OFF, the rotation of the workpiece W is continued until it is determined that the fitting signal is ON.
When it is determined in step S6 that the fitting signal is ON, the control device 50 stops the rotation of the second spindle motor 32LM of the second spindle device 30L. (Step S7)
After the rotation of the workpiece W is stopped, the control device 50 outputs a gripping (clamping) signal to the first chuck 33R so that the workpiece W is gripped by the first chuck 33R. (Step S8)
Next, the control device 50 outputs a servo-on signal to the first spindle motor 32RM of the first spindle device 30R, sets the first spindle motor 32RM to the servo-on state, and sets the first and second spindle motors 32RM, 32LM to the servo-on state. To do. (Step S9)

As described above, the processing apparatus 1 can support the workpiece W as a predetermined phase by rotating the first main shaft 32R and controlling the phase of the fitting piece MC of the fitting member 35R.
Note that the servo system used in the above description has a behavior of recognizing the current position without operating when the servo system is switched from the servo-off state to the servo-on state according to the parameters of the servo system.

  As described above, by using the processing apparatus 1 described in the present embodiment, the workpiece W can be reliably supported in a predetermined phase in a short time. Further, in the processing apparatus 1 of the present embodiment, when the fitting piece MC of the fitting member 35R is fitted into the fitting groove MK of the workpiece W, the impact force due to the rotation of the workpiece W is an external force with respect to the first main shaft 32R. work. In some cases, the external force exceeds the frictional resistance of the seal 38R and rotates the motor shafts of the first main shaft 32R and the first main shaft motor 32RM. However, the processing apparatus 1 according to the present embodiment uses the first main shaft motor 32RM. Is in a servo-off state, the servo system will not detect an abnormality due to the impact force during fitting.

In addition, the said embodiment can also be changed as follows.
In Step 2, after the first and second spindle devices 30R and 30L sandwich and support the workpiece W from both ends, the control device 50 outputs a servo-on signal to the first and second spindle motors 32RM and 32LM. Then, the second spindle motors 32RM and 32LM are set in the servo-on state. Further, the control device 50 outputs a gripping (clamping) signal to the first and second chucks 33R and 33L, and puts the workpiece W into a gripping state.
Next, the control device 50 drives the first and second spindle motors 32RM and 32LM to rotate the gripped workpiece W.
Furthermore, in step S3, while the workpiece W is rotating, the first spindle motor 32RM is set in a servo-off state, and an open (unclamp) signal is output to the first chuck 33R, thereby opening the first chuck 33R.
Thereafter, steps S4 and S5 may be omitted, and the operations of steps S6 to S9 may be performed.

  Further, in step S5, the rotation direction of the workpiece W may be reversed in the middle of the rotation, whereby the fitting can be performed efficiently and in a short time.

  In step S5, the rotation of the first main shaft 32R is suppressed by the frictional resistance of the seal 38R. However, the rotation may be suppressed by a braking means such as a brake, thereby efficiently and in a short time. The fitting piece MC of the fitting member 35R can be fitted into the fitting groove MK of the workpiece W.

In this embodiment, a grindstone is used as an example of a processing tool, but it can be applied to a machine tool using various processing tools such as a cutting tool.
Moreover, the processing apparatus 1 provided with the workpiece support apparatus of this invention is not limited to the grinding machine shown in FIG. 1, For example, it is also possible to apply to a lathe.
The workpiece W is not limited to the EPS steering rod described in the present embodiment, and the chuck is provided at one end of the workpiece W so that the gripping position of the workpiece W by the chuck is in a predetermined phase. Any workpiece W may be used as long as the workpiece W is formed with a fitting groove to be fitted to the fitting piece.

1: grinding machine (processing device) 2: bed 10: grinding wheel support device 10M: Z-axis motor 10E: Z-axis detection means 11: grinding wheel platform traverse base 20: grinding wheel platform 20M: X-axis motor 20E: X axis detection means, 21: grinding wheel rotating motor, 22: grinding wheel (processing tool), 23: grinding wheel rotating shaft member, 24: transmission mechanism, 25: belt, 30R, 30L: first and second main shafts Devices (first and second support devices), 30RM, 30LM: first, second motor, 30RE, 30LE: first, second detection means, 31R, 31L: first, second headstock, 32R, 32L: First, second spindle, 32RM, 32LM: first, second spindle motor, 32RE, 32LE: first, second spindle detection means, 33R, 33L: first, second chuck, 34R, 34L: first, second Shaft hole, 35R: fitting member, 35L: contact member, 37R, 37L: adjustment member, 38R, 38L: seal, 39R, 39L: supply passage, 50: control device, 60: truing device, 61: truing table, 62: Forming grindstone, 73, 74: Temporary cradle, 120: Z-axis moving device, 130R, 130L: First and second moving devices, 140: X-axis moving device, W: Workpiece (workpiece), K: Machining Location: J: Rack part, MK: Fitting groove, MC: Fitting piece, CZ: Spindle rotation axis (workpiece rotation axis), GZ: Grinding wheel guide rail, GX: X axis guide rail, GR: First Guide rail, GL: Second guide rail

Claims (7)

A first support device for supporting one end in the axial direction of a workpiece disposed on a workpiece rotation axis;
A second support device disposed opposite the first support device and supporting the other end of the workpiece in the axial direction;
Control means for controlling the first support device and the second support device,
The first support device includes first gripping means for gripping one end of the workpiece,
A first servo motor for rotating the first gripping means around the workpiece rotation axis;
A fitting piece fitted in a fitting groove formed at one end of the workpiece;
Biasing means for biasing the fitting piece toward the second support device,
The second support device includes second gripping means for gripping the other end of the workpiece;
A second servo motor for rotating the second gripping means around the workpiece rotation axis,
The control means includes
By rotating the workpiece relative to the fitting piece, the fitting piece is fitted into the fitting groove of the workpiece,
A workpiece support device, wherein the workpiece is supported at a predetermined phase by controlling a phase of the fitting piece. The workpiece support device according to claim 1,
The control means includes
A fitting that turns off the first servo motor when the first gripping means does not grip the workpiece, and turns on the second servomotor when the second gripping means grips the workpiece. A workpiece support device, wherein the workpiece is rotated relative to the fitting piece by executing a step. The workpiece support device according to claim 2,
The control means includes
The first servo motor is turned on, the first gripping means grips the workpiece, the second servo motor is turned on, and the second gripping means grips the workpiece. The workpiece support device is configured to execute the fitting step after the workpiece is rotated about the workpiece rotation axis by the first servo motor and the second servo motor. The workpiece support device according to claim 3,
The control means includes
In the fitting step, the workpiece support device reverses the rotation direction of the second servo motor. The workpiece support device according to any one of claims 1 to 4,
A rotation braking means for braking rotation of the first gripping means;
The control means includes
In the fitting step, the rotation of the first gripping means is braked by the rotation braking means. The workpiece support device according to claim 5,
The rotation braking means includes a resistance member arranged directly or indirectly on the outer periphery of the rotation shaft of the first servomotor;
Pressing means for pressing the resistance member from the radially outer side to the inner side,
The workpiece support device according to claim 1, wherein the control means brakes rotation of the first gripping means by controlling a pressing state by the pressing means. The workpiece support device according to any one of claims 1 to 6,
A processing tool that is pressed against the workpiece supported by the workpiece support device and that processes the workpiece by moving relative to the workpiece;
The first gripping means and the second gripping means are chucks capable of sandwiching and gripping the workpiece from the side surface of the workpiece,
The said control means performs the process after supporting the said workpiece | work in a predetermined | prescribed phase, The processing apparatus characterized by the above-mentioned.

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