JPS6010872B2 - Gauge bar support device for internal grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a gauge bar in an internal grinding machine, particularly a front bearing that extends in the gauge rod in all axial directions and that communicates with an air passage formed by fitting two pipes together. Rear bearing opening provided in the gauge rod as well as the Sekiguchi part○
This invention relates to a device for floatingly supporting and rotating a gauge bar by means of two bearing closures of a section.

Generally, in internal grinding machines, a plug gauge type sizing device is widely used, and a sliding bearing is used as a support bearing device for a gauge bar used in this plug gauge type sizing device.

However, this sliding bearing has the disadvantage that extreme wear occurs between the sliding bearing (gunmetal metal) and the gauge bar at the bearing position, resulting in poor dimensional accuracy of the gauge bar. Gauge bars had to be replaced periodically to maintain them. Furthermore, this sliding bearing requires the supply of lubricating oil to the bearing portion, and it is also necessary to prevent the intrusion of dirt. This invention improves and eliminates the disadvantages of the above device by supporting the gauge bar with an air bearing.The structure of this invention will be described below with reference to the embodiments shown in the drawings.

The gauge bar support and rotation device according to the present invention includes a first gauge bar support and rotation device.
The figure shows a machine body A, a pair of bearings B, a work spindle shaft C, a gauge rod D, a pair of air bearings E, a gauge bar 1 F, means G for supporting the gauge bar, a first pulley means and a second pulley. The method is comprised of means 1. The main body A of the machine includes a main body 1 in a stationary part, a cylindrical hole 2, and a cylindrical stepped part 3 for iron-mounting a pair of bearings B.
4 and an oil supply path 5 for supplying lubricating oil to the bearing. As shown in FIGS. 2 and 3, roller bearings 6 and 6' are used as the pair of bearings B, and are positioned by the steps 3 and 4 of the main body 1, the stopper 7, and the collar 8. A work spindle shaft C is rotatably supported in the hole 2. The work spindle shaft C is provided with a flange portion 9 for attaching a chuck 10 to the tip thereof,
The intermediate portion has a cylindrical portion 11 extending in the direction of the ball, and the rear end portion extends beyond the bearing 6' to the first pulley means. The flange portion 9 positions the inner ring of the bearing 6, and the rear end portion of the cylindrical body portion 11 has a first
A screw 12 is provided for engagement with the pulley means. The gauge rod D is made by shrink-fitting two tubes 13 and 14, and its tip extends from the opening □ of the flange 9 of the work spindle shaft C, and its rear end extends beyond the entire length of the work spindle C to the gauge bar. It extends to the means G that supports F. The tip 14a of the tube 14 is provided with an air jet hole 15 as shown in an enlarged view in FIG. , the outer diameter 14c is provided with a groove for forming an air introduction hole 16 in the axial direction, as shown in FIG. A screw is provided on its outer diameter, and is screwed into a member constituting the air bearing E. On the other hand, the tube 13 to be fitted is located on the outer periphery of the tube 14, and its tip is slightly set back from the tube 14, and its rear end has a flange portion 13d formed outward, and constitutes an air bearing E. It is hermetically connected to the member. The pair of air bearings E consists of a front bearing 17 and a rear bearing 18, and the front bearing 17 is located at the tip 14a of the tube 14.
An outer member 1 whose inner periphery is partially cut into an annular shape is inserted into the
9, and an air reservoir 20 formed between the outer member 19 and the tip 14a of the tube 14, and the air reservoir 20 is connected to the air introduction hole 16 and the air jet hole 15. . On the other hand, the rear bearing 18 is sealingly connected to the respective flanges 13d and 14d provided at the rear ends of the tubes 13 and 14, and its outer periphery is connected to a part of the inner ridge of the means G for supporting the gauge bar F. An annular outer member 21 having an L-shaped cross section inserted and an inner village 23 having an air jet hole 22
An air reservoir 24 is provided at the joint surface between the two. Further, this outer member 21 is provided with an air passage 25 for sending air to an air introduction hole 16 which is fitted to an air bearing 17 provided at the front portion. The inner diameter of this air bearing E should be matched to the gauge rod D, and the clearance with the gauge bar F should be approximately 0.03 to 0.035 for the front bearing 17 and approximately 0.04 to 0.45 for the rear bearing 18. Set to . The gauge bar F consists of a cylindrical shaft, is supported by the above-mentioned pair of air bearings E, and extends beyond them in the axial direction. The means G for supporting the gauge bar is located on the outer periphery of the rear bearing 18 and includes a main body 26 to which a part of the outer circumferential surface and inner circumferential surface of the outer member 21 are joined, and a flange portion for supporting the second pulley means 1. 27, and this main body 26 has a rear bearing 1.
Air passage 28 for sending air to air reservoir 24 of No. 8
and a bolt hole 29 for bolting the outer member 21 to the main body 26. The first pulley means consists of two pulleys 30 and 31, and the pulley 31 is adapted to be threadedly engaged with a screw 12 provided at the rear end of the work spindle shaft C. The three pulleys rotate the work spindle shaft C from an external drive source, and the pulley 31 transmits rotation at a different rotational speed from the work spindle shaft C to the gauge bar F via the second pulley means 1. belongs to. Also, 32 is a lock bolt to prevent the pulley 31 screwed onto the work spindle shaft C from loosening, and to prevent the pulley 31 from being tilted by the amount of twist of the screw when the pulley 31 is tightened to the flange portion 9. be. The second pulley means 1 is for transmitting rotation from the pulley 31 to the gauge bar F, and has a flange portion 27.
It consists of two pulleys 34, 35 connected by a common shaft 33 mounted above, and a pulley 36 fixed on the gauge bar F. The pulley 36 is fixed to the outer periphery of the sleeve 37, and the sleeve 37 is connected to the gauge bar F.
Although they are rotated together by a sliding key (not shown), they are freely movable in all directions, and are rotatably supported within the main body 26.

In the above configuration, when the pulley 30 is rotated by any driving means, the work spindle C rotates because the pulley 30 is fixed on the work spindle axis C.

At this time, since the pulley 31 is also fixed on the work spindle C, the pulley 31 also rotates at the same time as the work spindle C.The rotation of the pulley 31 is transmitted to the pulley 34 via the belt, and the rotation of the pulley 31 is transmitted to the pulley 34 via the belt. The rotation is transmitted via a pulley 35 coaxial with the pulley 34 to a pulley 36 fixed on the gauge bar F via a sleeve 37, and the gauge bar F also rotates simultaneously with the work spindle axis C. In this case, by changing the diameters of the pulleys 30 and 31, the gauge bar F is configured to transmit rotation at a different number of rotations than the work spindle shaft C. At this time, when air is sent to the air passages 25 and 28 by any means, the air sent from the air passage 25 passes through the air introduction hole 16 and the air reservoir 20 and is blown out from the air jet hole 16 in the air bearing 17. The gauge bar F is supported in a floating manner, and the air passage 2 is also connected to the air bearing 18.
The air sent from 8 passes through the air reservoir 24 and blows out from the air outlet 22, supports the gauge bar F in a floating manner, and further supports the gauge bar F between the air bearings 17 and 18. The inner surface of the pipe 14 of the head D that faces the gauge bar F is shaved outward, so that when the gauge bar F is floated by the air bearings 17 and 18, the gauge bar F and the gauge rod D do not come into contact with each other. Therefore, the gauge bar F' rotates in a completely floating state within the gauge rod D. Therefore, wear on the gauge bar is significantly reduced compared to conventional bearings in which the gauge bar is supported and rotated. In addition, in a comparison between a conventional bearing device and the air bearing device of the present invention, the amount of wear on the gauge bar after 3 months of use was 15%.
When a difference of 0 to 200 fres to 5 m was confirmed, the operation of the gauge bar F can be made even smoother by including mist in the air sent to this air bearing, and due to the constant jetting of air. , dirt, etc. can be prevented from entering the inside, thereby further ensuring the accuracy of the inner diameter. As explained above, the present invention provides a plug gauge type sizing device for an internal grinding machine, in which a cylindrical work spindle has a chuck at its tip and is rotatably supported through the grinding machine body via a bearing. The rear end of the gauge rod, which is loosely inserted into the shaft, is fixedly supported on the grinding machine body in a cantilevered structure independently of the ball bearing part of the work spindle shaft, and is constructed with a double pipe structure, so that the iron of these double pipes is A long air introduction hole is formed in the axial direction between the mating parts, and the vicinity of both ends of a gauge bar inserted into the gauge rod so as to be freely rotatable and slidable in the axial direction are supported in a floating manner by air bearings, Air is supplied from the fixed support at the rear end of the gauge rod.
The air is supplied directly to the rear end side air bearing, and the air is supplied to the front end side air bearing via the air introduction hole of the double pipe, and rotation is applied to the work spindle shaft by the first pulley means at the rear end of the work spindle shaft. In addition, since the rotation is transmitted from the first pulley means to the gauge bar via the second pulley means, it is possible to prevent wear of the gauge bar and maintain high accuracy over a long period of time. This eliminates the need for periodic replacement, and even if a slight misalignment of the workpiece occurs due to wear of the shoe or dirt between the contact surface of the workpiece and the shoe during centerless grinding of the workpiece. Since the gauge bar is floatingly supported by an air bearing, it can be advanced parallel to the axis of the workpiece through self-alignment, allowing for accurate measurements.

In particular, air is supplied to the air bearings that are floatingly supported near both ends of the gauge bar. This must be done using a long cylindrical space, and the air bearing itself must also be installed within this space.

In this way, it is difficult to supply air from the outside because it is surrounded by rotating members from the inside and outside, and the gap in the direction of the flea is narrow. , it is not easy to supply air to the air bearing.
However, in this invention, a gauge rod is inserted into the upper air space through the work spindle shaft, and its rear end is fixedly supported on the grinding machine body in a cantilevered structure independently of the bearing part of the work spindle shaft. By fixedly inserting and arranging the air bearing at the tip of the gauge bar without interfering with the inner and outer rotating members, the air bearing at the rear end of the gauge bar can be easily installed at the rear of the gauge rod. The cantilever support structure member at the end (the grinding machine body that is independent of the bearing part of the work spindle shaft) allows for easy placement.Furthermore, the gauge rod itself has a double tube structure, and these two By forming an axially long air introduction hole between the joints of the tubes, it was possible to easily form an air supply passage to the air bearing on the tip side of the gauge bar, and also,
Air supply ports to the air bearings at the front and rear of the gauge bar can be formed using the fixed support at the rear end of the gauge rod.
The air supply structure can be simplified. Furthermore, since the gauge bar is driven to rotate by using the first pulley means at the rear end of the work spindle shaft and through the second pulley means, it is possible to give a speed difference between the work spindle shaft and the gauge bar. This makes it possible to automatically change the supporting position of the plug gauge in the circumferential direction of the workpiece, thereby enabling accurate size measurement that is not affected by wear of the plug gauge at always different positions.

[Brief explanation of the drawing]

FIG. 1 is an overall structural drawing showing a typical embodiment of the present invention, FIG. 2 is an enlarged sectional view of the front portion thereof, and FIG. 3 is an enlarged sectional view of the rear portion thereof. FIG. 4 is a partially enlarged sectional view of the air bearing portion, and FIG. 5 is a sectional view taken along the line X--X. A...Machine body, B.
...Pair of bearings, C...Work spindle shaft, D...Gauge rod, E...Pair of air bearings, F
...Gauge bar, G...Means for supporting the gauge bar, day...First f. - Pulley means, 1...Second pulley means. Figure 1 Figure 4 Figure 5 Figure 2 Figure 3

Claims (1)

[Claims] 1. In a plug gauge type sizing device for an internal grinder, the gauge rod has a chuck at its tip and is loosely inserted into the cylindrical work spindle shaft, which is rotatably supported through the grinder body via a bearing. The end is fixedly supported on the grinding machine body in a cantilever structure independently of the bearing part of the work spindle shaft, and it is constructed with a double pipe structure, and a long air in the axial direction is installed between the fitting parts of these double pipes. An introduction hole is formed, and the vicinity of both ends of a gauge bar inserted into the gauge rod so as to be rotatable and slidable in the axial direction are supported in a floating manner by air bearings, and air is introduced from a fixed support at the rear end of the gauge rod. The air is supplied directly to the rear end side air bearing, and the air is supplied to the front end side air bearing via the air introduction hole of the double pipe, and the work spindle shaft is rotated by the first pulley means at the rear end of the work spindle shaft. and from the first pulley means;
A support device for a gauge bar in an internal grinding machine, characterized in that rotation is transmitted to the gauge bar via a second pulley means.