JP2002052465A - Steady rest device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steady rest device for preventing the vibration or deflection of a work with machining resistance in precisely machining a machined portion of a work planetary-rotated at a position offset from the rotational axis of the work. SOLUTION: The steady rest device comprises an arm portion 21a pivotally supported with a grinding wheel spindle W as a supporting point and adapted to be moved forward and backward to an axis B connecting the grinding wheel spindle W and a grinding point and a supporting portion 21b formed at the end of the arm portion 21a for supporting a crank pin CP(1) planetary-rotated around a C-axis against machining resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to rotate a crankshaft about a C-axis which coincides with the center of a journal, and to rotate a rotary grinding tool to an X-axis which coincides with a radial direction of a crankshaft according to a planetary rotation phase of a pin portion. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steady rest device for supporting a workpiece against machining resistance, in a CX axis controlled crankpin grinding device for grinding a pin portion by moving the pin portion along.

[0002]

2. Description of the Related Art When a low rigidity (small and long) workpiece is machined by rotating a workpiece such as a lathe or a grinding machine, the tool is pressed against the workpiece. 2. Description of the Related Art In order to prevent a workpiece from swinging or bending, a steady rest device that presses and supports the workpiece is used.

As shown in FIG. 6, a crankshaft CS
Is rotated about a C axis coinciding with the journal rotation axis, and a pin portion CP that rotates planetarily at a position eccentric with respect to the C axis.
When grinding the pin portion CP by moving the grindstone 90 along the X axis orthogonal to the C axis in accordance with the rotational phase of A certain journal part CJ is used as a steady rest 95.
Processing is performed with support by a and 95b.

[0004]

As described above, the rigidity of the crankshaft changes in accordance with the rotation phase of the pin portion by the planetary rotation of the pin portion, which is the processing location, at a position eccentric to the C axis. However, there is a problem that the grinding resistance changes. In addition, since the journal portion serving as a processing reference is supported by the steadying device, there is a problem that if the journal portion is not processed with high accuracy, the processing accuracy of the pin portion as the processed portion is affected.

According to the present invention, a crankshaft is rotated about a C axis coinciding with a journal rotation axis, and a tool is rotated with respect to the C axis in accordance with a rotation phase of a pin portion which rotates planetarily at a position eccentric with respect to the C axis. In grinding the pin portion by moving it back and forth along the orthogonal X axis, a steady rest that prevents the workpiece from swinging or bending due to machining resistance in order to machine the pin portion of the crankshaft with high precision It is intended to provide a device.

[0006]

According to a first aspect of the present invention, there is provided a steady rest device for rotating a workpiece, which rotates in a planetary manner at a position where a processing portion is eccentric with respect to the rotation axis of the workpiece, around the rotation axis. By moving the grindstone head forward and backward in synchronization with the rotation phase of the workpiece, the grinding machine that grinds the workpiece with a disk-shaped grindstone that is rotatably supported on the grindstone head and driven to rotate, An anti-sway device for supporting the workpiece in opposition to the arm portion, which is pivotally supported on an axis on a rotation axis of the grinding wheel so as to be pivotable, and abuts on an outer periphery of a processing location of the workpiece. A contact that slidably supports the processing location, and a support that is formed at the tip of the arm portion and supports the processing location of the workpiece against a processing resistance. is there.

According to the first aspect of the present invention, while rotating a workpiece that rotates in a planetary rotation around the rotation axis at a position where a processing portion is eccentric with respect to the rotation axis of the workpiece, the workpiece is synchronized with the rotation phase of the workpiece. By moving the wheel head back and forth,
Since the processing location apparently draws a circular locus whose radius is the sum of the grinding wheel radius and the radius of the processing location centered on the axis on the grinding wheel rotation axis, the anti-sway device uses the axis on the grinding wheel rotation axis as the fulcrum. By being pivotally supported, the workpiece can always be supported against the machining resistance, and machining is performed without being affected by the direction fluctuation of the grinding resistance generated due to the vertical movement of the grinding point. It is possible. In addition, it is possible to support a steady portion of a processing portion of a workpiece that rotates in a planetary manner at a position eccentric with respect to the rotation axis of the workpiece.

According to a second aspect of the present invention, there is provided a steady rest device.
The above-mentioned steady rest device is characterized in that the support portion is provided with an advancing / retracting moving means which can advance / retreat in an axial direction connecting a rotation center of the grinding wheel and a grinding point. According to the second aspect of the present invention, the steady rest device can be moved back and forth in the axial direction connecting the rotation center of the grindstone and the grinding point, thereby enabling the steady rest support to follow the diameter of the processing portion of the workpiece changed by grinding. It is.

According to a third aspect of the present invention, there is provided a steady rest device.
In the steady rest device according to the second aspect, the front and rear balance is maintained around a shaft on a rotating shaft of the grinding wheel in a state where a processing location of the workpiece is supported. According to the third aspect of the invention, a smooth turning operation is possible without resistance due to the weight of the steadying device.

According to a fourth aspect of the present invention, there is provided the steady rest device.
Alternatively, in the steady rest device according to claim 3, the support portion is provided with a sizing device. According to the fourth aspect of the invention, by providing the support unit with the sizing device, it is possible to measure the diameter of the processing portion of the workpiece while performing the grinding.

According to a fifth aspect of the present invention, there is provided the steady rest device.
In the steady rest device described above, the diameter of the grindstone can be measured by the sizing device. According to the fifth aspect of the invention, it is possible to measure the absolute size of the grindstone diameter without attaching / detaching the grindstone.

According to a sixth aspect of the present invention, there is provided a steady rest device.
The swinging device according to any one of claims 1 to 5, wherein the arm portion is swung about an axis on a rotation axis of the grindstone in a state in which the support of the processing portion of the workpiece by the support portion is released. It is characterized by having. According to the sixth aspect of the invention, at the time of attaching and detaching the workpiece, the swing of the steady rest device can be restricted while the swing of the steady rest device can be adjusted. It is possible to automate the operation of the steady rest support and release. In addition, the steady rest support and release operation can be performed regardless of the processing position of the workpiece that rotates planetary at an eccentric position with respect to the rotation axis of the workpiece.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a bed of a crankpin grinding device, in which a guide 3 is provided in a lateral longitudinal direction of the bed 1, and a table 2 is slidably mounted on the guide 3 in a lateral direction (Z-axis direction). ing. Table 2
A headstock 7 and a tailstock 8 are provided at both ends thereof at positions facing each other. A spindle drive motor 9 for driving the rotation of the workpiece is provided on the headstock 7, and a crankshaft which is a workpiece by a chuck or the like. The end of the tailstock 8 is configured to support the axis of the crankshaft CS by its center. Therefore, since the journal portion of the crankshaft CS is held coaxially with the main shaft axis, the crankshaft CS is controlled to rotate around the axis (C axis) of the journal portion.

A Z-axis feed screw 4 is disposed on the bed 1 in the horizontal direction (Z-axis direction). A nut (not shown) is fixed to a lower portion of the table 2 and screwed to the feed screw 4.
Therefore, the table 2 can be slid in the horizontal direction by the table driving motor 5 provided at the left end of the feed screw 4, and the movement of the table 2 in the Z-axis direction allows
The positions of the different pin portions CP (1) and CP (2) are
6 can be aligned and indexed.

An X-axis guide 12 is provided in a direction (X-axis direction) orthogonal to the sliding direction (Z-axis direction) of the table 2, and a whetstone table 1 having a whetstone 16 on the X-axis guide 12.
The grindstone table 11 is provided with a drive motor (not shown) for rotating the grindstone 16 around the grindstone axis W.

An X-axis feed screw 13 is disposed on the bed 1 in a vertical direction (X-axis direction). A nut (not shown) is fixed to a lower portion of the grinding wheel stand 11 and screwed with the X-axis feed screw 13. I have. Therefore, the wheel head 11 can be slid in the X-axis direction by the wheel head drive motor 14 provided at one end of the X-axis feed screw 13, and by moving the wheel head 11 in the X-axis direction, the wheel 16 is moved. It can move in a direction (X-axis direction) orthogonal to the axis of the crankshaft CS.

The wheel head drive motor 14, table drive motor 5, and spindle drive motor 9 are all encoders 10, 6, so that they can be controlled and rotated based on a program.
A servomotor with 15 is used.

Reference numeral 20 denotes a main body of the steadying device, which is pivotally supported on the grindstone shaft W between the grindstone table 11 and the grindstone 16. The arm portion of the steady rest device 20 has a hook shape, and is offset in the Z-axis direction so that the steady rest supporting portion formed at the distal end opening of the arm portion is located at a position facing the grindstone 16. I have. Thus, the pin portion CP (1) of the crankshaft CS, which is a processing portion, is supported against the processing resistance.

Numeral 50 is a numerical controller for controlling and managing the entire grinding apparatus. The numerical controller 50 stores a machining operation program and a C-X
The axis control data and the like are registered, and the main shaft drive motor (C axis) control circuit 41, the grinding wheel drive motor (X axis) control circuit 43, and the table drive motor (Z axis) control circuit via the central processing unit 52 and the interface 53. The main shaft drive motor 9, the grinding wheel head drive motor 14, and the table drive motor 5 of the crank pin grinding device are controlled and driven.

Therefore, the table drive motor 5 is driven by the numerical control device 50 so that the crankpin CP (1)
The table 2 is indexed such that the position of the table 2 is aligned with the position of the grindstone 16, and the crankshaft C is
S is rotated, and the grinding wheel 1 is positioned at a shape position corresponding to the planetary rotation phase of the pin portion CP (1) that rotates planetarily by the rotation.
The wheel rest drive motor 14 is driven to bring the pin portion 6 into contact, and the steady rest device 20 pivotally supported on the grinding wheel axis W is opposed to the machining resistance by the pin portion CP.
By supporting (1) in contact, the pin portion CP
The grinding process (1) is performed.

FIG. 2 shows a pin portion CP of a crankshaft CS that rotates planetarily at a position eccentric with respect to the main shaft axis (C axis).
The rotation phase of (1), that is, the rotation angle of the C axis {0, Θ
Position X in the X-axis direction of the grindstone 16 with respect to 1, {2.
CX with data of {0, X # 1, X # 2 ... X # n ...
This is axis control data.

FIG. 3 is a block diagram showing a steady rest device according to a first embodiment of the present invention. A disc-shaped grindstone 16 mounted on a grindstone stand 11 is supported by a grindstone shaft W (point W in the figure). Being able to rotate. CP (1) is the crankshaft C
S shows the circumference of the cross section of the pin portion of this S, and this pin portion CP
The center point O of (1) is rotatably supported on a circular orbit S about a C axis (point C in the figure) coinciding with the rotation axis of the crankshaft CS. The grinding wheel base 11 is a grinding wheel 1
6 can move forward and backward in the X-axis direction (horizontal direction in FIG. 3) so as to follow the shape position according to the rotation phase of the pin portion CP (1) that performs planetary rotation about the C-axis.

Reference numeral 20 denotes a steady rest device main body,
The hook-shaped arm 21 is pivotally supported between the wheel 1 and the grindstone 16 so as to be pivotable about the grindstone axis W. The hook-shaped arm 21 has an arm 21a extending in the direction of the axis B connecting the grinding wheel axis W with the grinding point and the center point O of the pin CP (1), and one end U connected to the front of the arm 21a. Character-shaped support part 21b
And is formed from The other end of the U-shaped indicating portion 21b is open in the direction of the grinding wheel axis W on the axis B, and a V-shaped groove is formed in the front end opening. The contacts 23a and 23b which abut on the outer periphery of the pin portion CP (1) of the CS and slidably support the pin portion CP (1) are fixed.

The U-shaped indicating portion 21b is in contact with one end of the indicating portion 21b connected to the arm portion 21a, in contact with the outer periphery of the pin portion CP (1) of the crankshaft CS. The tip end opening of the indicating portion 21b that slidably supports the pin portion CP (1) is offset in the Z-axis direction (perpendicular to the paper surface in FIG. 3), and the whetstone 16 and the crankshaft CS The shape is such that it does not interfere with the counter weight or the like.

An elongated hole 24 is formed in the arm portion 21a in the direction of the axis B. The elongated hole 24 is slidable in the elongated hole 24, and the whetstone shaft W is used as a fulcrum via a bearing (not shown). A link member 25 pivotally supported is provided. A motor 26 whose rotation axis coincides with the axis B is fixed to the rear end of the arm portion 21a. A ball screw 27 is connected to the rotation axis of the motor 26, and a nut formed on the link member 25 is formed. It is screwed with the part. Therefore, by rotating the motor 26 in the forward and reverse directions, the hook-shaped arm 21 can move forward and backward in the direction of the axis B around the grinding wheel axis W, and the contact pressure of the pin portion CP (1) with the grinding wheel 16 can be increased. Is to adjust.

With such a configuration, the steady rest device 20 is provided with the pin portion CP (1) that planetarily rotates around the C axis.
Wheel axis W so as to follow the shape position corresponding to the rotation phase of
At the fulcrum, and always supports the pin portion CP (1) of the crankshaft CS, which is the processing location, against the processing resistance.

It is preferable that the anti-sway device 20 be balanced in the front-rear direction with the grinding wheel axis W as a fulcrum in a state where the pin portion CP (1) of the crankshaft CS is supported. This enables a smooth turning operation without resistance due to the weight of the apparatus main body.

Above the rear end of the steady rest device 20, the swing of the steady rest device 20 due to its own weight is restrained while the steady rest support by the steady rest device 20 is released, and the swing of the steady rest device 20 is controlled. An actuator 38 for adjusting the angle is provided. This actuator 38
When the workpiece is mounted or removed, the push rod 39 is moved forward and backward to press and support the rear end of the steady rest device 20, thereby enabling the steady rest device 20 to support and release the steady rest of the workpiece. This is to automate the operation.

The operation of the steady rest device 20 having the above configuration is as follows. First, the grindstone table 11 is advanced to the fast-forward advancing end position with respect to the pin portion CP (1) of the crankshaft CS stopped at a predetermined position. In the state, the actuator 3
The push rod 39 of FIG. 8 is retracted to adjust the turning angle of the steady rest device 20 to an angle that coincides with the axis B. At this time, the predetermined position is preferably a position where the axis B is parallel to the X axis.

Next, while moving the grinding wheel head 11 forward,
By rotating a motor 26 attached to the rear end of the hook-shaped arm 21, the hook-shaped arm 21 is moved forward in the direction of the axis B with the grindstone axis W as a fulcrum. The pin portion CP (1) is sandwiched by the pointing portion 21b formed on the
6 is adjusted so that the pin portion CP (1) has a predetermined contact pressure.

Subsequently, when grinding the pin portion CP (1), the grindstone 16 is moved in the X-axis direction so as to follow the shape position corresponding to the rotation phase of the pin portion CP (1) that rotates planetarily about the C axis. Is moved forward and backward. At this time, the hook-shaped arm 21 pivotably supported on the grindstone axis W as a fulcrum and supporting the pin portion CP (1) to swing is supported by the pin portion CP (1) which planetarily rotates around the C axis. Is swung about the grindstone axis W as a fulcrum so as to follow a shape position corresponding to the rotational phase of the wheel.

During grinding, the amount of forward movement of the hook-shaped arm 21 is determined from the amount of cutting of the grindstone 16 with respect to the pin portion CP (1), or current control is performed so that the load applied to the motor 26 is always constant. By making the hook-shaped arm 21 move forward according to the cutting amount, the contact pressure of the pin CP (1) against the grinding stone 16 is adjusted so as to be always constant.

When the pin portion CP (1) has a predetermined size, the whetstone 16 is retracted, and the hook 26 is retracted by rotating the motor 26 in the reverse direction. 39 is advanced, the anti-sway device 20 is turned to the initial position, and the grindstone table 11 is retracted to finish the grinding.

(Embodiment 2) The steady rest device of the second embodiment is different from the steady rest device 20 of the first embodiment in that the mechanism for moving the hook-shaped arm 21 forward and backward is changed. I will explain mainly.

As shown in FIG. 4, there is provided a link member 25 which is slidable in an elongated hole 24 formed in the arm portion 21a and pivotally supported about a grinding wheel axis W as a fulcrum. . A cylinder 31 is fixed to the rear end of the arm portion 21a. The cylinder 31 has a piston 32 that can advance and retreat on the same axis as the axis B.
2 is fixed to the link member 25. The cylinder 31 is provided with ports 33 and 34 that communicate with the front chamber and the rear chamber, respectively.
4 is connected to a pressure oil supply control circuit (not shown).
Therefore, by controlling the supply and discharge of the pressure oil to and from the ports 33 and 34 to move the piston 32 forward and backward, the hook-shaped arm 21 can move forward and backward in the direction of the axis B with the grinding wheel axis W as a fulcrum, The contact pressure of the pin CP (1) against the grindstone 16 is adjusted.

The operation of the steady rest device 20 having the above configuration is as follows. First, the grindstone table 11 is advanced to the fast-forward advancing end position with respect to the pin portion CP (1) of the crankshaft CS stopped at a predetermined position. In the state, the actuator 3
The push rod 39 of FIG. 8 is retracted to adjust the turning angle of the steady rest device 20 to an angle that coincides with the axis B. At this time, the predetermined position is preferably a position where the axis B is parallel to the X axis.

Next, while moving the grinding wheel head 11 forward,
The hook-shaped arm 21 is ground by supplying pressure oil to a port 34 communicating with a rear chamber of a cylinder 31 attached to the rear end of the hook-shaped arm 21 and discharging pressure oil from a port 33 communicating with a front chamber. The pin portion CP (1) is moved forward in the direction of the axis B with the axis W as a fulcrum, and the whetstone 16 and the indicating portion 21b formed at the tip of the hook-shaped arm 21 are moved.
Is adjusted so that the pin portion CP (1) has a predetermined contact pressure with the grindstone 16.

Subsequently, when grinding the pin portion CP (1), the grindstone 16 is moved so that the grinding wheel 16 follows the shape position corresponding to the rotation phase of the pin portion CP (1) that rotates planetarily about the C axis.
It is moved back and forth in the axial direction. At this time, the hook-shaped arm 21 pivotably supported on the grindstone axis W as a fulcrum and supporting the pin portion CP (1) to swing is supported by the pin portion CP (1) which planetarily rotates around the C axis. Is swung about the grindstone axis W as a fulcrum so as to follow a shape position corresponding to the rotational phase of the wheel.

During the grinding, the supply and discharge of the pressure oil are controlled so that the pressure difference between the front chamber and the rear chamber of the cylinder 31 is always constant, and the pressure oil is controlled according to the cutting amount of the grindstone 16 with respect to the pin portion CP (1). By moving the hook-shaped arm 21 forward, adjustment is performed so that the contact pressure of the pin portion CP (1) against the grinding stone 16 is always constant.

When the pin portion CP (1) has a predetermined size, the grindstone 16 is retracted, and at the same time, pressure oil is supplied to the port 33 communicating with the front chamber of the cylinder 31 to communicate with the rear chamber. By discharging the pressure oil from the port 34, the hook-shaped arm 21 is retracted, and the actuator 38
Then, the push rod 39 is advanced, and the steady rest device 20 is turned to the initial position, and the grindstone table 11 is retracted to finish the grinding.

In the above embodiment, the motor 26,
The hook-shaped arm 21 is advanced and retracted in the direction of the axis B by an advance and retreat moving means such as a cylinder 31 so that the pin CP (1) can be adjusted to a predetermined contact pressure with the whetstone 16 so as to be adjustable. Although the apparatus has been described, the support portion 21b is elastically deformed, and the elastic force of the support portion 21b supports the pin portion CP (1) against the grinding resistance to prevent the pin portion CP (1) from moving. In addition, the structure of the steady rest device 20 can be simplified.

(Applied Modification 1) As shown in FIG. 4, a sizing device 35 is provided at the tip of the support portion 21b.
The sizing device 35 includes a tracing stylus 36 that can move forward and backward in the direction of the axis B.
The three points 3a and 23b are brought into contact with the outer periphery of the pin part CP (1), so that the pin part CP is formed using a three-point contact method.
The diameter of (1) is measured, and when the measured value reaches a predetermined size, a fixed size signal is output.

In the first modified example, the case where the sizing device 35 is provided in the steady rest device of the second embodiment has been described. However, the sizing device 35 is similarly provided in the steady rest device of the first embodiment. It is possible to provide.

(Application Modification 2) As shown in FIG. 5, a sizing device 35 is provided in the steady rest device of the first embodiment, and the absolute size of the grindstone diameter is measured by a measuring element 36 of the sizing device 35. Things.

The operation of measuring the diameter of the grindstone by the steady rest device 20 having the above structure is performed by moving the stylus 36 of the sizing device 35 to a predetermined position until the stylus 36 comes into contact with the grindstone 16. Arm 21 is moved forward, and the distance e between the grinding wheel axis W and the tip end of the measuring element 36, that is, the grinding stone 16 is determined by the amount of forward movement of the hook-shaped arm 21 and the measuring element 36 at the time when the contact signal is output. Measurement of the radius. Further, with the hook-shaped arm 21 moved forward to a predetermined position,
By moving the tracing stylus 36 of the sizing device 35 forward until it comes into contact with the grindstone 16, it is possible to measure the grindstone diameter.

In the second modified example, the measurement of the absolute size of the grindstone diameter by directly contacting the tracing stylus 36 of the sizing device 35 with the grindstone 16 has been described. It is also possible to measure the diameter of the grinding wheel during grinding. That is, the distance e between the grinding wheel axis W during grinding and the tip position of the tracing stylus 36 is determined by the radius of the grinding wheel 16 and the pin portion CP.
Since this is the sum with the diameter of (1), the radius of the grindstone 16 can be calculated by subtracting the diameter of the pin portion CP (1) from the distance e.

[0047]

As described above, according to the first aspect of the present invention, the steady rest apparatus according to the first aspect of the present invention always processes a processing portion of a workpiece that rotates planetary at an eccentric position with respect to the rotation axis of the workpiece. By supporting the steady rest against the resistance,
Machining can be performed without being affected by directional fluctuation of grinding resistance generated due to vertical movement of the grinding point, and machining accuracy of a workpiece is improved.

According to the second aspect of the present invention, the workpiece is improved in precision of machining by supporting the anti-sway to follow the diameter of the machining location of the workpiece which is changed by grinding.

Further, in the invention according to claim 3, the front-rear balance is maintained about the axis on the rotating shaft of the grinding wheel in a state where the processing location of the workpiece is supported, so that the anti-sway device is provided. The smooth turning operation is possible without resistance due to the weight of the workpiece, and the machining accuracy of the workpiece is improved.

Further, in the invention of claim 4, by measuring the diameter of the processing portion of the workpiece while performing the grinding, the processing accuracy of the workpiece is improved and the cycle time can be shortened.

Further, according to the fifth aspect of the invention, it is possible to measure the absolute size of the grindstone diameter without attaching / detaching the grindstone, thereby improving the machining accuracy of the workpiece.

Further, according to the invention of claim 6, it is possible to automate the operation of supporting and releasing the steady rest of the processing portion of the workpiece and to rotate the planetary gear at a position eccentric with respect to the rotation axis of the workpiece. No matter where the processing location of the workpiece to be processed is, the operation of the steady rest support and release is possible, so that the cycle time can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a grinding device in which a steady rest device of the present invention is used.

FIG. 2 is a diagram illustrating a relationship between a pin portion that rotates planetary around a spindle axis and a grindstone.

FIG. 3 is a diagram illustrating a configuration of a steady rest device according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a configuration of a steady rest device according to a second embodiment and a first modification of the present invention.

FIG. 5 is a diagram illustrating a configuration of a steady rest device according to a second modification of the present invention.

FIG. 6 is a view showing a conventional steady rest support.

[Explanation of symbols]

 CS Crank shaft, workpiece CP (1), CP (2) Crank pin, processing point C C-axis, rotation axis of workpiece W Whetstone axis, rotation center of grinding wheel B Axis line connecting grinding wheel axis and grinding point 11 Wheelhead 16 Whetstone 20 Anti-sway device 21 Hook-shaped arm 21a Arm 21b Support 23a, 23b Contact 26 Motor 31 Cylinder 35 Sizing device 38 Actuator, turning means

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yuji Niwa 1-1-1, Asahi-cho, Kariya-shi, Aichi F-term (reference) 3C034 AA01 BB78 BB92 CA01 CA06 CB01 CB15 DD01 DD07 3C043 AC21

Claims (6)

[Claims] 1. A whetstone head is moved in and out of synchronization with a rotation phase of a workpiece while rotating a workpiece rotating in a planetary manner at a position where a processing location is eccentric with respect to the rotation axis of the workpiece, around the rotation axis. In this way, in a grinding machine that grinds the workpiece with a disk-shaped grindstone rotatably supported on the grindstone table and rotatably supported, the steady rest device supports the workpiece against machining resistance. An arm portion pivotally supported on an axis on a rotation axis of the whetstone so as to be pivotable, and a contact contacting an outer periphery of a processing portion of the workpiece to slidably support the processing portion, A support portion formed at a tip of the arm portion and supporting a processing portion of the workpiece against a processing resistance. 2. The steady rest device according to claim 1, further comprising a moving means for moving the supporting portion in an axial direction connecting a rotation center of the grinding wheel and a grinding point. apparatus. 3. The steady rest device according to claim 1, wherein the front and rear balance is established about a shaft on a rotating shaft of the grinding wheel in a state where a processing portion of the workpiece is supported. A steady rest device. 4. The steady rest device according to claim 2, wherein a sizing device is provided on the support portion. 5. The steady rest device according to claim 4, wherein a diameter of the grinding wheel can be measured by the sizing device. 6. The steady rest device according to claim 2, wherein the arm portion is mounted on a rotating shaft of the grindstone in a state where the support of the processing portion of the workpiece by the support portion is released. A steadying device comprising a turning means for turning the shaft about a fulcrum.