JP4103568B2 - Grinding wheel pressing device of super finishing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a grindstone driving device in a superfinishing machine that superfinishes a raceway surface of a bearing.
[0002]
[Prior art]
The super finishing machine for the ball bearing raceway surface is, for example, a grindstone pressed against the raceway surface formed on the outer periphery of the inner ring of the bearing from the outside in the radial direction, with the swing axis passing through the center of curvature of the raceway surface as the center. It is configured to swing on a plane orthogonal to the circumferential direction. In such a super finishing machine, for example, a cylinder is arranged in parallel with the pressing direction of the grindstone, the grindstone and the piston rod are integrally connected by a connecting member, and the grindstone is pressed against the raceway surface by the fluid pressure supplied to the cylinder. (For example, refer to FIG. 2 of Patent Document 1). Further, a cylinder may be arranged coaxially with the swing shaft, and a grindstone may be pressed through a connecting member such as a lever or a link (see, for example, FIG. 4 of Patent Document 1).
On the other hand, it is also possible to press the grindstone by means other than the cylinder. For example, a force is applied to the shaft member arranged coaxially with the swinging shaft by a spring to pull it in the axial direction. A torque around the pinion shaft may be generated in the formed rack via the pinion, and the grindstone may be pressed against the raceway surface with this torque (see Patent Document 2). In this case, the grindstone holder can be rotated around the pinion, and the shaft member can be turned to retract the holder and grindstone from the machining position when not working.
[0003]
[Patent Document 1]
Japanese Examined Patent Publication No. 4-24186 (2nd page, Fig. 2 and Fig. 4)
[Patent Document 2]
Japanese Examined Patent Publication No. 58-2032 (pages 1 and 2, Fig. 1)
[0004]
[Problems to be solved by the invention]
In the superfinishing machine of the above-mentioned patent document 1, there are a connecting member for connecting the piston of the cylinder and a grindstone, a member for supporting the connecting member, etc., and these must be arranged in the vicinity of the workpiece. However, when the workpiece is an inner ring, the raceway surface is machined from the outside, so there is a sufficient access space. However, in the case of a relatively small-diameter outer ring, there is no allowance for an access space to a narrow outer ring inner periphery. Accordingly, when a grindstone is inserted on the inner peripheral side of the outer ring and pressed against the raceway surface, the connecting member or the like becomes an obstacle. That is, the configuration of the super finishing machine as disclosed in Patent Document 1 is difficult to apply to the processing of the outer ring.
On the other hand, even in the super finishing machine of Patent Document 2, when the workpiece is an outer ring with a small diameter, it is difficult to put the grindstone supported by the holder into the inner circumference of the outer ring.
[0005]
In view of the conventional problems as described above, an object of the present invention is to provide a grindstone pressing device for a super finishing machine suitable for processing an outer ring raceway surface. In addition, in relation to this, the object is to make the structure portion for pressing a tool such as a grindstone against the work piece compact.
[0006]
[Means for Solving the Problems]
A grinding wheel pressing device for a super finishing machine according to the present invention is a grinding stone pressing device for a super finishing machine that presses and rocks a grinding stone against a raceway surface of a bearing, and supplies a fluid to the inside through a separate pipe. And a second port on one end side and the other end side, and a cylinder case having an opening on the other end side and a space in the cylinder case can be partitioned and slid to a predetermined position on the other end side A plate-like piston head that closes an opening in the axial direction of the second port at its axial end face and rapidly increases the pressure in the pipe connected to the second port, and the cylinder through the opening. A base portion is inserted into the case and arranged in a piston rod shape with respect to the piston head, and an end portion that contacts the raceway surface is outside the cylinder case from the opening. A grindstone projecting, said grinding wheel and a holder for movably guiding and holding the sliding direction of the piston head, the pipe leading to the second port, in order to perform the exchange of the grinding wheel, detecting the pressure in the pipe The pressure switch to be connected is connected (Claim 1).
In the grindstone pressing device of the super finishing machine configured as described above, since the grindstone is arranged as if it is a piston rod with respect to the piston head, the original piston rod does not exist and is shortened in the axial direction. . Therefore, the total length from the cylinder case to the tip of the grindstone is very compact, and it is possible to perform super finishing by inserting them into the small diameter outer ring. When the grinding wheel wears and the piston head reaches the descending end, the axial end surface of the piston head closes the opening of the second port in the axial direction of the piston head. As a result, the pressure in the pipe connected to the second port increases rapidly, and the pressure change can be detected.
[0007]
Further, the pipe leading to the second port, in order to perform the exchange of the grinding wheel, Runode have pressure switch for detecting the pressure inside the pipe is connected, by monitoring the operation signal of the pressure switch, exchange of the grinding wheel Can be done in a timely manner.
[0008]
In the grindstone pressing device of the super finishing machine (Claim 1), the holder may constitute a part of the cylinder case (Claim 2 ).
In this case, it is not necessary to provide a cylinder case lid separately from the holder.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a front view of a grindstone head 1 including a grindstone pressing device 2 of a super finishing machine according to an embodiment of the present invention. FIG. 2 is a side view (partially omitted). 1 and 2, a mounting seat 4 is fixed to the swing shaft member 3, and the grindstone head 1 is attached to the mounting seat 4 via a pin 5. The grindstone head 1 oscillates as the oscillating shaft member 3 alternately reversely rotates around the oscillating axis A at high speed. The grindstone head 1 has a three-dimensional arm shape as shown in the figure extending from the upper end of the base arm 1a rising in the Y direction in the figure in the order of the Z direction, the -X direction, and the -Y direction, and finally extending in the -Z direction. It is made. And the grindstone pressing device 2 inserted in the inner periphery of the outer ring | wheel 6 of a bearing is provided in the front-end | tip part 1b of the arm.
[0010]
The grindstone head 1 is connected to a piston 8 of a hydraulic cylinder through a pin 7. The piston 8 is provided so as to protrude leftward from the inside of the swing shaft member 3, and the grindstone head 1 is driven at the portion of the pin 7 by moving a fixed stroke leftward from the position shown in FIG. 1. The pin 5 rotates around the pin 5 in the clockwise direction by a predetermined angle. At the time of setup, the grindstone head 1 can be rotated in this way, and the portion of the grindstone pressing device 2 can be retracted from the processing position.
[0011]
FIG. 3 is a cross-sectional view of the grindstone pressing device 2. In the figure, a grindstone pressing device 2 is connected to a tip portion 1b of an arm, closes a cylinder portion 21 having a cylindrical inner wall surface 21a, and an upper portion of the cylinder portion 21, and constitutes a cylinder case 20 together with the cylinder portion 21. A piston plate 24 made of aluminum and having a circular flat plate shape (for example, a thin wall of about 7 mm) having a sealing O-ring 23 mounted on the outer periphery, which is slidable by partitioning the space in the cylinder case 20 with the upper lid 22 and the piston An iron pressing portion 30 connected to the head 24 with a screw 25, a columnar grindstone 26 arranged in a piston rod shape with respect to the piston head 24 while a base portion 26a is brought into contact with the pressing portion 30, and a cylinder case A holder 27 having an opening 27a through which the grindstone 26 is inserted; Mounted between the inner and the grindstone 26 of a, and a carbide sleeve 28 for inserting the grindstone 26. The holder 27 is fixed to the cylinder portion 21 with a bolt (not shown). The inner wall surface 21a of the cylinder portion 21 that is in sliding contact with the piston head 24 is coated with a fluororesin. Thereby, even if the piston head 24 is thin, it does not tilt with respect to the axial direction (Y direction) during sliding, and a smooth sliding operation is possible.
[0012]
The carbide sleeve 28 is provided in order to prevent the holder 27 from being in direct contact with the grindstone 26 and being worn. There is a slight gap between the carbide sleeve 28 and the grindstone 26 so that the grindstone 26 can smoothly move in the axial direction. The grindstone 26 is held by the holder 27 and the carbide sleeve 28 via an O-ring 29 attached to the outer periphery in a state where the base portion 26a is inserted into the cylinder case 20 through the opening 27a. The pressing portion 30 is provided to prevent the aluminum piston head 24 from coming into direct contact with the grindstone 26 and wearing out. Further, the lower end of the grindstone 26 protrudes from the holder 27. The outer ring 6 of the bearing, which is a workpiece, is supported by a support device (not shown) and is rotated in the circumferential direction with the position shown.
[0013]
A first port P1 for supplying air pressure to the internal space is opened at the upper end of the cylinder portion 21 of the cylinder case 20. To this end, a predetermined path passes through the passage C1 in the cylinder portion 21 from the external pipe L1. Pressure air is sent in. On the other hand, around the grindstone 26 in the upper part of the holder 27, a second port P2 is opened. Similarly, through the passage C2 formed in the cylinder portion 21 and the holder 27 from the external pipe L2, Air of a predetermined pressure is sent. The air pressure sent to the second port P2 may be the same as or less than the air pressure sent to the first port P1.
[0014]
When air is sent from the first port P1 to the first space S1 above the piston head 24, the piston head 24 is pressed downward, and the grindstone 26 is pressed against the raceway surface 6a on the inner periphery of the outer ring. Further, the air sent from the second port P2 to the second space S2 below the piston head 24 leaks out from the gap between the carbide sleeve 28 and the grindstone 26. A pressure switch 9 is connected to the external pipe L2, and the pressure in the pipe L2 is detected. While air is leaking from the gap, the pressure in the pipe L2 does not increase and the pressure switch 9 does not operate.
[0015]
The center of curvature O of the track surface 6a to be processed is on the extension line of the oscillation center axis A (FIG. 1). FIG. 4 is a diagram showing a state in which the grindstone head 1 (FIG. 1) and the grindstone pressing device 2 are swung, and the rocking is performed at high speed between the position indicated by the solid line and the position indicated by the two-dot chain line. Repeated. Thus, the raceway surface 6a is superfinished by pressing the grindstone 26 against the raceway surface 6a and swinging it at a high speed and rotating the outer ring 6 at a constant speed in the circumferential direction.
[0016]
In the grindstone pressing device 2 configured as described above, the grindstone 26 is arranged directly on the piston head 24 as if it were a piston rod, so that the original piston rod does not exist and is shortened in the axial direction. Therefore, the total length from the cylinder case 20 to the tip of the grindstone 26 becomes very compact. Therefore, it is possible to insert these into the outer ring 6 having a small diameter and perform super finishing. That is, this structure provides an unprecedented “tool cylinder”, thereby achieving a compact structure part for pressing a tool such as a grindstone 26 against the raceway surface 6a of the bearing 5 as a workpiece. Can do. Moreover, the grindstone pressing device 2 of the superfinishing machine suitable for the raceway surface processing of the inner periphery of the outer ring, where it is difficult to secure the access space of the grindstone 26 and the grindstone pressing device 2 can be provided.
The holder 27 replaces the lower lid of the cylinder portion 21. In other words, the holder 27 is also a part of the cylinder case 20. Accordingly, it is not necessary to provide a lower lid separately from the holder 27, so that the length in the axial direction is further reduced accordingly.
[0017]
When the grindstone 26 is worn by use for a certain period of time, the piston head 24 is lowered. As shown in FIG. 5, when the piston head 24 reaches the lower end of the stroke end, the piston head 24 closes the second port P2. Thereby, the pressure in the external piping L2 increases rapidly, and the pressure switch 9 operates. Therefore, if the operation signal of the pressure switch 9 is monitored, the grindstone 26 can be replaced in a timely manner.
The position of the second port 24 may not be on the holder 27, and may be opened at the lower part of the inner wall surface 21 a in the cylinder portion 21 and closed with the outer peripheral surface of the piston head 24.
[0018]
Incidentally, the "tool cylinder" above, but may be applied to a machine tool which requires an operation of pressing the various tools is not limited to the grindstone, its basic structure is as shown in FIG. 6, supply fluid to the interior The cylinder case 20 having the first port P1 and the second port P2 on one end side and the other end side, respectively, and having an opening 20a on the other end side, and the inner space can be partitioned and slid. A flat plate-like piston head 24 that closes the second port P2 when it is slid to a predetermined position, and a tool that is disposed in a piston rod shape with respect to the piston head 24 and whose end protrudes out of the cylinder case 20 from the opening 20a. 26. Such a tool cylinder can be mounted even in a narrow space where there is not enough space.
[0019]
【The invention's effect】
The present invention configured as described above has the following effects.
According to the grindstone pressing device of the super finishing machine according to claim 1, since the grindstone is arranged like a piston rod with respect to the piston head, the original piston rod does not exist and is shortened in the axial direction. The overall length from the cylinder case to the tip of the grindstone becomes very compact, and it is possible to insert these into the inside of a small-diameter outer ring for super-finishing. That is, it is possible to provide a grindstone pressing device for a superfinishing machine suitable for processing the raceway surface on the inner circumference of the outer ring, where it is difficult to secure an access space for the grindstone and the grindstone pressing device. Also, when the grinding wheel wears and the piston head reaches the descending end, the opening in the axial direction of the piston head of the second port closes the axial end surface of the piston head, and the pressure in the pipe connected to the second port increases rapidly. Therefore, the wheel can be replaced in a timely manner by detecting the pressure change.
[0020]
The grinding wheel pressing device Superfinishing machine according to claim 1, the pipe leading to the second port, in order to perform the exchange of the grinding wheel, the pressure switch for detecting the pressure in the pipe is connected, the pressure switch By monitoring the operation signal, the wheel can be replaced in a timely manner.
[0021]
According to the grindstone pressing device of the super finishing machine of the third aspect, it is not necessary to provide a cylinder case cover separately from the holder, and accordingly, the length in the axial direction is further reduced.
[Brief description of the drawings]
FIG. 1 is a front view of a grindstone head including a grindstone pressing device of a super finishing machine according to an embodiment of the present invention.
FIG. 2 is a side view of the grindstone pressing device.
FIG. 3 is a cross-sectional view of the grindstone pressing device.
4 is a cross-sectional view showing a state where a grindstone pressing device is swung from the state of FIG. 3;
5 is a cross-sectional view showing a state in which a grindstone has been worn away from the state of FIG.
FIG. 6 is a cross-sectional view showing a basic configuration of a tool cylinder.
[Explanation of symbols]
2 Grinding wheel pressing device 6 Outer ring 6a Raceway surface 20 Cylinder case 20a Opening 24 Piston head 26 Grinding stone 26a Base 27 Holder P1 First port P2 Second port S1 First space S2 Second space

Claims (2)

A grindstone pressing device of a super finishing machine that presses and rocks a grindstone against a raceway surface of a bearing,
A cylinder case having a first port and a second port for supplying fluid to the inside through separate pipes on one end side and the other end side, respectively, and an opening on the other end side;
The space inside the cylinder case can be partitioned and slid, and when sliding to a predetermined position on the other end side , the axial end face closes the opening in the axial direction of the second port , and A plate-like piston head that rapidly increases the pressure in the pipe connected to the two ports;
A base is inserted into the cylinder case through the opening, is disposed in a piston rod shape with respect to the piston head, and an end that abuts on a raceway surface protrudes out of the cylinder case from the opening,
A holder that guides and holds the grindstone so that the grindstone can move in the sliding direction of the piston head, and a pressure switch that detects a pressure in the pipe is connected to the pipe connected to the second port in order to replace the grindstone Superfinishing machine grinding wheel pressing apparatus characterized by being. The grindstone pressing device for a super finishing machine according to claim 1, wherein the holder constitutes a part of the cylinder case .

Images