JPH067885Y2 - Grinding machine support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a work support device for a grinder used for processing, for example, an inner race of a ball bearing.

[Conventional technology]

In order to process a work piece that is a work piece that forms an inner race or the like, it is first necessary to chuck the work piece on a grinding machine. Such chucking is performed by fixing and holding the workpiece in a contact state with the reference surface at the tip of the backing plate. Then, conventionally, the workpiece is fixedly held by magnetic attraction by an electromagnet.

However, in order to securely fix and hold the work piece by such magnetic attraction, the magnetic force of the electromagnet must be efficiently applied to the work piece, and the electromagnet should be brought as close as possible to the reference plane. Must be deployed.
That is, the electromagnet must be arranged between the ball bearing for supporting the backing plate and the reference surface, which increases the distance from the ball bearing to the reference surface.

As described above, if the distance from the ball bearing to the reference surface becomes long, there is a problem in that "working" occurs in the workpiece when the backing plate rotates, and the machining accuracy cannot be improved. I was invited.

For this reason, as in the work holding device for a shoe grinding machine disclosed in Japanese Patent Publication No. 48-36557, a face plate is fixed to the end surface of the spindle for driving and rotating the work, and the work piece is placed on the base of the grinding machine. A work supporting device including a shoe for rotatably supporting the work piece is provided, and a holding member having a holding surface facing the face plate is connected to a cylinder device provided on a loader arm for loading and unloading a workpiece. The main shaft and the holding member are connected so that they can rotate synchronously, and the face plate and the holding member are connected so that they rotate synchronously. It has been proposed that the work piece is movably clamped only in the radial direction, and the work piece clamped together with the main shaft and the holding member is integrally rotated so that the work piece can be ground.

As a result, "runout" of the work piece is prevented, and the work piece can be processed with high precision.

However, in the work holding device for the shoe grinder, in order to cause the holding member and the main shaft to engage with each other in a concavo-convex manner to rotate the main shaft and the holding member in synchronization, a drive pin is provided on the holding member side.
It is necessary to provide a drive plate on the main shaft side, which complicates the structure on the main shaft side and the holding member side.

Moreover, since the drive pin and the drive plate are engaged with each other in the center hole formed in the workpiece, the drive pin and the drive plate must be made small when the diameter of the center hole is small.

However, since the driving pin and the driving plate transmit the rotational driving force, there is a limit to forming the driving pin and the driving plate small. For example, when the diameter of the central hole is extremely small, such as 2 mm, the above-mentioned is taken into consideration. Forming the drive pin and the drive plate is practically difficult. That is, with respect to a work piece having a small center hole diameter, it cannot be clamped by the main shaft and the holding member and integrally rotated.

Further, when the holding member and the cylinder device for moving the holding member forward and backward are fixedly mounted on the loader arm, when the workpiece is pressed and sandwiched between the holding member and the spindle, the loader arm is not pressed against the load. Since the force is applied, an unreasonable force is applied to the support portion of the loader arm to damage the support portion, and further, the loader arm bends to cause a problem that the clamping force of the workpiece becomes insufficient. It was

Therefore, in order to avoid the above problems, it was considered to apply the structure of the grinding device disclosed in Japanese Utility Model Laid-Open No. 59-183328 to the workpiece holding device of the shoe grinding machine. In the above grinding apparatus, a pair of holders for holding the workpiece by sandwiching the workpiece by moving up and down are provided so as to rotate the workpiece, and move horizontally to place the workpiece between the holders. A suction unit that suction-holds the workpiece is provided on the loader arm that conveys the workpiece.

According to this, the work piece can be held between the holders even if the inner diameter is small, and since the loader arm is separated from the holder during the processing, a pressing force is generated on the loader arm during the processing. Is prevented.

[Problems to be solved by the device]

However, in the above-mentioned conventional configuration, it is necessary to align the rotation axis of the workpiece with that of the holder, but the workpiece conveyed by the loader arm is accurately conveyed to a predetermined position on the holder. It is difficult to do so, and when it is mounted eccentrically with respect to the rotation axis of the holder for the work piece, there arises a problem that the processing accuracy of the work piece that is rotated and ground decreases.

Further, also in the work holding device of the shoe grinder,
No consideration is given to the mounting accuracy of the work piece.

Therefore, an object of the present invention is to carry in a work piece by using a loader arm that holds and conveys the work piece.
The unloading can be speeded up and the deformation of the loader arm can be prevented by avoiding the transmission of the pressing force to the loader arm during processing of the workpiece held by the pressing force, and the workpiece can be rotated. The object is to improve the reproducibility of the attachment of the workpiece to the processing position, which should be held coaxially with the main axis for driving, and avoid the deterioration of the processing accuracy of the workpiece.

[Means for Solving the Problems]

In order to solve the above-mentioned problems, a work support device for a grinding machine according to the present invention is provided in a fixed headstock device so as to be capable of advancing and retreating in the axial direction and rotating about the axis. And a pressing rotary member that is coaxially opposed to the pressing rotary member, is restricted from moving in the axial direction, and is supported so as to be rotatable about the axis in synchronization with the pressing rotary member. Between the contact rotating member having a reference surface that can contact the surface and the processing position of the workpiece and the storage position of the unprocessed workpiece between the contact rotating member and the pressing rotating member. And a loader arm that moves to convey the workpiece, and that is provided on the loader arm so as to be movable back and forth in the same direction as the axial direction of the pressing rotary member and the contact rotary member and rotatable about the axis. The above-mentioned pressure is applied to the end at the processing position of the workpiece. The pressed portion pressed by the rolling member is formed, while the front end portion is formed with an abutting member that holds the workpiece coaxially and that abuts the rear end surface of the workpiece. Rotation supporting means for supporting the workpiece so that the workpiece is clamped between the contact member and the reference surface of the contact rotating member by the forward movement of the pressing rotary member of the workpiece, and the workpiece. And a grinding wheel that is movable in the radial direction of the workpiece at the processing position to grind the workpiece, and the tip of the pressing rotary member is pushed by the forward movement of the pressing rotary member. It is characterized in that a guide portion is formed in contact with the portion and guides the rotation supporting means so as to be coaxial.

[Action]

According to the above configuration, the work piece in the storage position is held by the abutting member of the rotation supporting means and is conveyed to the work position by the loader arm. The workpiece conveyed to the processing position is rotated by being pressed and held between the rotation support means and the contact rotation member by advancing the pressing rotation member in the axial direction, and is ground by the grinding wheel that moves in the radial direction. It

Further, in the above configuration, the headstock device is provided in a fixed state separately from the loader arm, and the rotation support means is provided so as to be movable back and forth in the axial direction with respect to the loader arm. It is possible to prevent the reaction force of the pressing from being applied to the loader arm when the pressing rotation member is advanced in the axial direction and the workpiece is pressed and sandwiched by the rotation support means and the contact rotation member. Similarly, since the headstock device is provided in a fixed state and the relative position between the headstock device and the contact rotary member does not change, the pressing rotary member and the contact rotary member are rotated synchronously. Therefore, it is not necessary to engage these with concave and convex. That is, by connecting the pressing rotation member and the contact rotation member using a pulley, a belt or the like, the pressing rotation member and the contact rotation member can be synchronously rotated.

Moreover, in the above structure, a guide portion is formed at the tip of the pressing rotary member to guide the pressed portion so that the rotation supporting means is coaxial with the pressing rotary member by the axial advance of the pressing rotary member. Has been done. Therefore, when the workpiece is pinched between the abutting member that holds the workpiece coaxially and the reference surface of the abutting rotary member by the forward movement of the pressing rotary member, the pressing rotary member and the abutting member It is coaxial with the rotating member.

With this configuration, the above-described configuration makes it possible to increase the reproducibility of the attachment to the processing position where the workpiece is to be held during processing by the guide portion, and therefore the processing of the workpiece to be ground by rotation is performed. A decrease in accuracy can be avoided.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the work supporting device for a grinding machine according to the present invention, as shown in FIG. 1, the pressing rotary member 1 fitted in the piston 2 is restricted from moving in the axial direction with respect to the piston 2. On the other hand, it is rotatably supported around the shaft by ball bearings 3 and 4 fitted and inserted in the piston 2. The piston 2 is fitted in a cylinder 5 as a headstock device, which is provided in a fixed state. Rotation around the axis of the cylinder 5 is restricted, while the front chamber 5a and the rear of the cylinder 5 are restricted. The hydraulic oil supplied into the chamber 5b is driven to move back and forth in the axial direction of the pressing rotary member 1. As a result, the pressing rotation member 1 is provided in the cylinder 5 so as to be able to move forward and backward in the axial direction and to rotate around the axis.

At the central portion on the front end side of the pressing rotary member 1, a supporting means 2 to be described later is provided.
5 is formed with a tapered hole (guide portion) 1a that engages with the pressed portion 29a of the pin 29, and has a length corresponding to the amount of advance / retreat of the pressing rotary member 1 at a predetermined position on the rear end side outer peripheral portion. A key groove 1b is formed. Further, in the cylindrical portion 5c formed on the rear end side and the rear end side of the cylinder 5,
A pulley 6 for transmitting the rotational driving force from the outside to the pressing rotary member 1 is fitted. The pulley 6 includes a through hole 6a with a key hole fitted to the rear end side of the pressing rotary member 1, a recess 6b fitted to the ball bearings 8 and 9 fitted to the above-mentioned cylindrical portion 5c, and described later. And a belt hanging portion 6c around which the belt 22 of FIG. Then, the pulley 6 is fitted with the through hole 6a with the key hole on the rear end side of the pressing rotary member 1, and is rotated integrally with the pressing rotary member 1 by the key 7 inserted in the key groove 1b. At the same time, the ball bearings 8 and 9 allow smooth rotation on the cylindrical portion 5c.

In the vicinity of the pressing rotary member 1, the contact rotating member 10 is arranged opposite to the pressing rotary member 1 coaxially with a constant interval. The contact rotation member 10 is restricted from moving in the axial direction, but the ball bearing 11.1.
It is provided rotatably around the axis by 2. Further, a reference surface 10a that comes into contact with a front end surface of a workpiece 33, which will be described later, is formed at the tip of the contact rotating member 10 that faces the pressing rotating member 1. This reference plane 10
a is formed so as to face the pressing rotary member 1 side from the through hole 13a formed in the slide plate 13.
The belt hook 6c is provided near the rear end of the contact rotary member 10.
And two pulleys 14 and 15 having the same diameter as the above are fitted and fixed. Of these, the pulley 14 is connected to the rotating shaft 17a of the drive motor 17 by the belt 16, while the pulley 15 is connected to the rotating shaft by the belt 18. It is connected to a pulley 19 fitted and fixed to one end side of 20. A pulley 21 having the same diameter as the pulley 19 is fitted and fixed to the other end of the rotary shaft 20. The pulley 21 is connected to the pulley 6 by a belt 22. As a result, the pressing rotary member 1 rotates in synchronization with the rotation of the contact rotary member 10.

A loader arm 23 is disposed between the contact rotation member 10 and the pressing rotation member 1 as shown in FIG. One end side of the loader arm 23 is pivotally supported by a shaft 24 so as to be capable of arc-rotating in a direction orthogonal to the axial direction of the contact rotating member 10 and the pressing rotating member 1, and the loader arm 23 is fixed in the axial direction. It can be moved by a distance.

A rotation support means 25 is provided on the other end side of the loader arm 23. This rotation support means 25 is used for the sleeve 2
6, ball bearings 27 and 28, and a pin 29. The sleeve 26 is the loader arm 23.
On the other hand, while it is fitted in a non-rotatable state, it is movably supported in the range between the flange portion 26a of the sleeve 26 and the snap ring 30 in the axial direction. Ball bearing 2
7 and 28 are fitted in the sleeve 26 and rotatably support the pin 29. On the rear end side of the pin 29, a pressed portion 29a that is pressed by the pressing rotary member 1 at the processing position of the workpiece 33 is formed, while on the rear end surface of the workpiece 33 on the rear end surface of the workpiece 33. A flange-shaped abutting surface (abutting member) 29b that abuts, and the workpiece 3
Boss portion (contact member) 29c that fits in the center hole 33a of No. 3
And are formed.

At the position above the loader arm 23, the unprocessed workpiece 3
The in-shoot 31 for accommodating 3 ... And supplying the said to-be-processed object 33 ... to a processing position is arrange | positioned. Then, when the loader arm 23 moves forward at the raised position, the center hole 33a of the work piece 33 of the lowest value among the work pieces 33 ...
The boss portion 29c of the pin 29 is fitted in.

A grinding wheel 32 for grinding the workpiece 33 is provided in the vicinity of the workpiece 33 sandwiched between the contact surface 29b and the reference surface 10a of the contact rotary member 10. The grinding wheel 32 is rotatably driven by a rotation driving means (not shown), and is provided so as to be movable in the radial direction of the workpiece 33 so as to be brought into contact with or separated from the surface of the workpiece 33 to be ground. It is configured to be possible. Further, as shown in FIG. 3, shoes 34 and 35 for supporting the workpiece 33 from the radial side of the workpiece 33 are provided in the vicinity of the sandwiched workpiece 33. .

In the above configuration, in order to grind the workpiece 33,
First, the boss portion 29c of the pin 29 is fitted into the center hole 33a of the workpiece 33. This operation is performed by the loader arm 23
This is done by advancing the loader arm 23 to the inshoot 31 side at the rising position. When the fitting of the work piece 33 is completed, the loader arm 23 is arc-turned downward to pull out the work piece 33 from the opening 31a, and the work piece 33 is connected to the pressing rotary member 1 and the contact rotary member 10. Located between. Next, hydraulic oil is supplied into the rear chamber 5b of the cylinder 5 to move the piston 2 forward. As the piston 2 moves forward, the pressing rotary member 1 moves forward to engage the pressed portion 29a of the pin 29 with the tapered hole 1a,
The pin 29 is pressed while centering. When the pin 29 is pressed, the pin 29 moves to the contact rotation member 10 side together with the sleeve 26, and the contact surface 29b of the pin 29 is moved.
Then, the workpiece 33 is pressed and sandwiched by the reference surface 10a of the contact rotary member 10.

When the workpiece 33 is clamped, the drive motor 17 is operated to rotate the contact rotation member 10. Contact rotation member 1
The rotational driving force of 0 is pulley 15 → belt 18 → pulley 1
9 → rotary shaft 20 → pulley 21 → belt 22 → belt 6c is transmitted to the pulley 6, and the rotational driving force of the pulley 6 is transmitted to the pressing rotary member 1 via the key 7.
As a result, the contact rotating member 10 and the pressing rotating member 1 are synchronously rotated in the same direction, and the pin 29 and the workpiece 33 are synchronously rotated between the pressing rotating member 1 and the contact rotating member 10. become.

When the rotation of the work piece 33 is started, the grinding stone 32 is brought close to the work piece 33 to grind the work piece 33. At this time, a reaction force acts on the work piece 33 in a certain direction, but since the work piece 33 is held at the working position by the shoes 34 and 35, the work piece 33 is unevenly ground. There is no such thing.

When the grinding of the work piece 33 is completed, the grinding wheel 32 is separated from the work piece 33, and the rotation of the drive motor 17 is stopped to stop the rotation of the pin 29 and the work piece 33. When the rotation of the workpiece 33 stops, the cylinder 5
The hydraulic oil is supplied to the front chamber 5a to retract the pressing rotary member 1 to release the workpiece 33 from being clamped. After the clamping of the work piece 33 is released, the loader arm 23 is erected while the front end surface of the work piece 33 is placed along the slide plate 13. During the erection operation, the loader arm 23 is erected. The outer peripheral concave groove of the workpiece 33 is engaged with the guide plate (not shown) which is engaged with the outer peripheral concave groove of the workpiece 33. When the loader arm 23 is retracted in this state, the workpiece 33 drops. The workpiece 33 is removed from the boss portion 29c by the above operation. The removed work piece 33 is collected by a collecting device (not shown).

After the loader arm 23 retracts, the loader arm 23 shifts to the standing motion again. Then, in the standing position, the boss portion 29c has the lowest value of the workpiece 3 housed in the inshoot 31.
We will face 3. Then, as the loader arm 23 advances in this facing state, the boss portion 29c is fitted into the central hole 33a of the workpiece 33 as described above.

As described above, according to the workpiece support device of the present invention, the workpiece 33 is ground while being pressed and sandwiched between the contact surface 29b of the pin 29 and the reference surface 10a of the contact rotating member 10. , "Runout" of the work piece 33 is prevented, and the work piece 3
3 can be processed with high precision.

Further, the cylinder 5 is provided in a fixed state separately from the loader arm 23, and the rotation supporting means 2 is provided.
Since 5 is provided so as to be able to advance and retreat in the axial direction, when the pressing rotation member 1 is moved in the axial direction and the workpiece is pressed and sandwiched by the rotation support means 25 and the contact rotation member 10, this pressing force is applied. It is possible to prevent a reaction force from being applied to the loader arm 23. This solves the problem that an unreasonable force is applied to the support portion of the loader arm 23 to damage the support portion, and further the loader arm 23 bends and the clamping force of the workpiece 33 becomes insufficient. be able to.

Similarly, the cylinder 5 is provided in a fixed state, and the relative position of the cylinder 5 with respect to the contact rotating member 10 does not change as in the conventional case. It is not necessary to adopt a structure in which these members are engaged in a concavo-convex manner in order to rotate the member 10 synchronously. That is, as in this embodiment, the pressing rotary member 1
The synchronous rotation between the contact rotation member 10 and the pulley 6
It suffices to use 19.21 or belts 18 and 22. Therefore, even when the workpiece 33 having a small diameter of the center hole 33a is ground, the pressing rotary member 1 and the contact rotary member 10 can be reliably rotated synchronously. Further, as described above, since it is not necessary to form the concave-convex engaging portion, the shapes and structures of the pressing rotary member 1 and the contact rotary member 10 can be simplified.

Further, in the present embodiment, the work piece 33 is mounted and dismounted by fitting the boss portion 29c into the center hole 33a of the work piece 33, so that such mounting and dismounting are extremely easy. Further, the boss portion 29c facilitates centering of the work piece 33 and stabilizes the rotation of the work piece 33.

Further, in the configuration of the above-described embodiment, the push-rotating member 1 advances as the piston 2 moves forward, and the pin 2 is inserted into the tapered hole 1a.
9 presses the pin 29 while engaging the pressed part 29a of 9 to perform centering, so that the workpiece 33 is pressed while maintaining a coaxial state with the pressing rotary member 1 and the pin 29, and abuts and rotates. It contacts the reference surface 10a of the member 10. As a result, the work piece 33 becomes coaxial with the contact rotation member 10.

As a result, the above configuration is
The reproducibility of attachment of the workpiece 33 to the processing position to be held can be improved, and the reduction of the processing accuracy of the workpiece 33 that is rotated and ground can be prevented.

[Advantages of the Invention] As described above, the workpiece supporting device for the grinding machine according to the present invention can be moved forward and backward in the axial direction and can be rotated around the axis in the fixed headstock device. The pressing rotation member provided, and arranged to face the pressing rotation member coaxially,
The contact rotating member having a reference surface that can contact the front end surface of the workpiece, and the workpiece being conveyed to the processing position of the workpiece between the contact rotating member and the pressing rotating member. A loader arm that moves in order to move the loader arm, and the loader arm is provided so as to be capable of advancing and retracting in the same direction as the axial direction of the pressing rotary member and the contact rotary member and rotatably around the axis. A pressed portion that is pressed by the pressing rotary member is formed at the processing position of the object, while the front end portion holds the workpiece coaxially and abuts the rear end surface of the workpiece. A contact member is formed, and rotation for supporting the work piece such that the work piece is sandwiched between the abutment member and the reference surface of the abutment rotation member by the forward movement of the pressing rotation member. A supporting means, and the tip of the pressing rotary member is And 慴接 said pressed portion by advancement of pressure rotary member is configured to guide portion for guiding the rotary support means so as to be coaxial shape is formed.

As a result, in the above structure, since the rotation support means that is pressed by the pressing rotation member is attached to the loader arm so as to be able to advance and retreat in the axial direction, an unreasonable force is applied to the support portion of the loader arm and this support portion is applied. It is possible to solve the problem that the workpiece is damaged, or the loader arm is bent and the clamping force of the workpiece becomes insufficient.

Further, in the above configuration, since the relative position of the pressing rotation member and the contact rotation member does not change, it is not necessary to adopt a structure in which these are engaged in a concavo-convex manner in order to rotate the both in synchronization. The synchronous rotation of the member and the contact rotary member may be performed by using, for example, a pulley or a belt.

Therefore, even when a workpiece having a small center hole diameter is ground, it is possible to reliably perform synchronous rotation between the pressing rotation member and the contact rotation member. Further, as described above, since it is not necessary to form the concave-convex engaging portion on the pressing rotary member and the contact rotary member, the shapes and structures of these pressing rotary member and contact rotary member can be simplified.

In addition, in the above-mentioned configuration, the contact support member and the contact rotation member of the rotation support device are provided by providing the guide portion that is coaxial with the rotation support device and the press rotation member when the pressing rotation member advances in the axial direction. The workpiece sandwiched between the reference surface and the reference surface is coaxial with the pressing rotary member and the contact rotary member.

With this configuration, the above configuration makes it possible to enhance the reproducibility of the attachment of the workpiece to the processing position to be held when the workpiece is machined by the guide portion, so that the workpiece to be ground by rotation can be improved. It also has the effect of avoiding a reduction in the processing accuracy of the workpiece.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 3 show an embodiment of the present invention. FIG. 1 is a sectional view of a main part showing a workpiece supporting device of a grinder, and FIG. The drawing is a cross-sectional view taken along the line XX in FIG. 1, and FIG. 3 is a side view showing the relationship between the grinding wheel, the workpiece, and the shoe. 1 is a pressing rotary member, 1a is a tapered hole (guide portion), 2 is a piston, 5 is a cylinder (headstock device), 6 ・ 14 ・ 15
Numerals 19 and 21 are pulleys, 10 is a contact rotary member, 10a is a reference surface, 16 and 18 and 22 are belts, 17 is a drive motor, 23 is a loader arm, 24 is a shaft, 25 is a rotation support means, and 26 is A sleeve, 29 is a pin, 29a is a pressed portion,
29b is a contact surface (contact member), 29c is a boss (contact member), 31 is an inshoot, 32 is a grinding wheel, 33 is a workpiece, and 34 and 35 are shoes.

Claims (1)

[Scope of utility model registration request] 1. A pressing rotary member provided in a fixed headstock device so as to be capable of advancing and retracting in the axial direction and rotatable about an axis, and is arranged coaxially opposite the pressing rotary member. A contact rotation member having a reference surface that is supported to be rotatable around the axis in synchronism with the pressing rotation member and is capable of contacting the front end surface of the workpiece, while its movement is restricted in the axial direction. A loader arm that moves to convey the workpiece between the processing position of the workpiece and the storage position of the unprocessed workpiece between the contact rotation member and the pressing rotation member; The arm is provided so as to be capable of advancing and retracting in the same direction as the axial direction of the pressing rotary member and the contact rotary member and rotatable about the axis, and the rear end portion of the pressing rotary member at the processing position of the workpiece. While the pressed part that is pressed by is formed, the front end part Is formed with an abutting member that holds the workpiece coaxially and abuts on the rear end surface of the workpiece, and the contact member and the abutting rotary member of the contact rotating member are moved by the forward movement of the pressing rotary member. Rotational support means for supporting the workpiece so as to be sandwiched between the workpiece and the reference surface, and a workpiece that is provided movably in the radial direction of the workpiece at the processing position of the workpiece. A grinding wheel for grinding an object is provided, and a guide for guiding the rotation supporting means to be coaxial with the tip of the pressing rotation member by making contact with the pressed portion as the pressing rotation member advances. A workpiece supporting device for a grinding machine, characterized in that a portion is formed.