JPS61146464A - Cylindrical grinding head - Google Patents

Abstract

PURPOSE:To make highly accurate grinding performable in an efficient manner, by letting a tapelike grindstone pass through along the specified route, while applying it to a ball track guide surface, in case of grinding on the ball track guide surface at the outer ring side of a deep groove ball bearing. CONSTITUTION:A tapelike grindstone is continuously fed out of a delivery roller, and passes through a forming part 9b of a tape holder 8. On the other hand, an outer ring 10 is given the specified rotation, and a base 1 moves along a central axial direction of the outer ring 10 whereby the forming part 8b at a tip end of the tape holder 8 goes forward till it1reaches a spot just below a ball trach guide surface 10a.And, afterward when a servomotor 12 is started in motion, a pressing plate 17 advances forward whereby a rocking member 7 is forcibly pressed and rocked so that the forming part 8b is pressed to the ball trach guide surface 10a, thus plunge cut grinding takes place.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cylindrical polishing head, and particularly to a cylindrical polishing head used in a cylindrical polishing machine for polishing the ball raceway surface on the outer ring side of a deep groove ball bearing. Regarding.

[Prior Art] In order to determine the rotational accuracy of the bearing, the ball raceway surface of a deep groove ball bearing must generally be a perfect circle with an arcuate cross section with a radius of curvature slightly larger than the radius of the ball.
For this reason, careful attention is required during polishing.

Conventionally, a cylindrical polishing machine for performing this processing uses a small-diameter grindstone for internal grinding in its cylindrical polishing head. This small-diameter grindstone is dressed in a shape along a predetermined circular arc cross section, and polished by plunge grinding.

[Problems to be Solved by the Invention] However, with small-diameter grindstones, it is difficult to perform the above-mentioned dressing accurately, and when performing a large number of processes, deterioration of shape accuracy due to abrasive grains falling off is always a problem.

An object of the present invention is to provide a cylindrical polishing head that eliminates the need for dressing, prevents deterioration of shape accuracy due to abrasive grains falling off, and easily realizes efficient and high-precision polishing. There is a particular thing.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a tape holder whose tip is molded into a predetermined shape and whose molded surface is provided with a guide portion for passing a tape-shaped grindstone; a supporting member that supports the tape holder and swings or moves linearly; a swinging means for swinging or moving the supporting member;
pressure sensing means provided between the support member and the swinging means;

The tape-shaped grinding wheel is provided with a delivery roller that wraps the tape-shaped grindstone in multiple layers and sends out the tape-shaped grindstone to the tape holder, and a pull-out roller that is powered and rotates to pass through the tape holder and pull out the tape-shaped grindstone. It is characterized by

[Example 1 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a front view of the cylindrical polishing head according to the present invention, Fig. 2 is a plan view of Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a line AA in Fig. 1. 5 is a sectional view taken along the line B--B in FIG. 1, FIG. 6 is a sectional view taken along the line C--C in FIG. 2, and FIG. 7 shows the tape holder.

(a) is a front view, (b) is a plan view, and (c) is a right side view.

1 is a base that can be attached to the polishing head portion of a cylindrical polishing machine having a well-known configuration, 2 and 3 are brackets fixed to the base 1, 4 is a bearing pedestal similarly fixed to the base 1, and 5 is a bearing pedestal. Needle bearing 6 inserted into 4
7 is a swinging member fixed to the swinging support shaft 5 and swings around it; 8 is a tape holder held by the swinging member 7; this tape holder 8, the tape-shaped grindstone 9 is passed along a predetermined path to internally grind the ball raceway surface 10a of the outer ring lO of the deep groove ball bearing.

As shown in FIG. 7, the tape holder 8 has an arm portion 8a extending in the direction of the central axis of the outer ring 10, and a cross section perpendicular to the arm portion 8a extending in the direction of the central axis of the outer ring 10 with its tip extending along the direction of the central axis of the outer ring 10.
The molding is formed into a circular arc shape with a predetermined curvature required for a, and a cross section in a direction perpendicular to the arc shape has a predetermined radius of curvature (about the size of a chisel) that is smaller than the radius around the central axis of the ball raceway surface 10a. The arm part 8a is provided with two parallel guide grooves 8c and 8d for guiding the tape-shaped grinding stone along its extending direction, and the molded part 8b is provided with two parallel guide grooves 8c and 8d facing the guide groove 8C. A guide piece 8e is provided. As a result, the tape-shaped grindstone 9 is introduced into the guide groove 8C by a device to be described later, and when it passes through this, the guide piece 8
It is possible to be guided by the guide piece 8e and bent to the molding part 8b, go around it along the molding surface at the tip, bend again to be guided by the guide piece 8e, and be pulled out through the guide groove 8d. .

Reference numeral 11 denotes a motor bracket fixed to the base l, and a servo motor 12 is attached to this motor bracket 11. Reference numeral 13 denotes a support base formed by inserting the linear motion bearings 14 into two rows; 15 is a guide rod that slides while being guided by the linear motion bearings 14; one end is connected by a piece 16; the other end is a press plate 17; connected by. The piece 16 is screwed into a threaded portion formed on the output shaft 12a of the servo motor 12, and its rotation can provide linear motion to the guide rod 15. The pressing plate 17 can press the end of the swinging member 7 and give the swinging member 7 a swinging motion. Reference numeral 18 denotes a pressure sensor installed on the pressing portion of the pressing plate 17, which detects the strength of the pressing force and can control the rotation of the servo motor 12 based on the magnitude.

A feed roller 20 is fixed to a rotatable support shaft 21, supported by a bearing 22 supported by a bracket 3, and holds the tape-shaped grindstone 9 in multiple windings. A brake lever 23 is swingably supported by the bracket 3, and is biased by a spring (not shown) and pressed against a brake wheel 24 fixed to the support shaft 21.
Rotation of the feed roller 20 is suppressed. 25.26
．． Reference numerals 27 denote guide rollers for guiding the tape-shaped grindstones 9 sent out from the sending rollers 20 to the tape holders 8, and are rotatably supported by the brackets 2.

28, the tape-shaped grindstone 9 is inserted into the guide groove 8C of the tape holder 8.
An introduction guide roller is arranged on an extension line of the introduction guide roller for introduction into the apparatus, and is similarly rotatably supported by the bracket 2.

Reference numeral 29 denotes a pull-out roller disposed below the introduction guide roller 28 so as to form a pair with the introduction guide roller 28, and guides the tape-shaped grindstone 9 drawn out from the guide groove 8d of the tape holder 8. Reference numeral 30 denotes a first pull-out roller for pulling out the tape-shaped grindstone 9 that has passed through the pull-out roller 29, and a bearing 31.3 fitted into the bracket 2.3.
The 0-rotation shaft 33 supported by 2 and fixed to a rotatable rotation shaft 33 is equipped with a timing pulley 34 at the l end, and is provided on the output shaft of a motor 35 with a gear head fixed to the bracket 3. A timing belt 37 is interposed between the timing pulley 36 and the motor 35 to drive and rotate the timing belt 37.

Reference numeral 40 denotes a first pressing roller that is held between a pair of swinging levers 41 that are swingably supported by the bracket 2, is urged by a spring member, and is pressed against the first pull-out roller 30. 42 is a second pull-out roller fixed to a rotating shaft 45 supported by a bearing 43.44 fitted in the bracket 2.3, similar to the first pull-out roller 30; Spur gear 46 fixed to
A spur gear 48 is supported by the brackets 2 and 3 and rotates, and a timing pulley 49 is provided on the same axis as the spur gear 48. Furthermore, the transmission means including a timing pulley 50 provided on the rotating shaft 45 and a timing belt 51 that is connected to these pulleys allows the rotating shaft to rotate in complete synchronization with the first pull-out roller 30. Reference numeral 52 denotes a swing lever 5 that is swingably supported by the bracket 2.
This is a second pressing roller that is supported by 3 and urged by a spring member to be pressed against the second pull-out roller 42.

Next, the effect will be explained. The tape-shaped grindstone 9 wound multiple times around the delivery roller 20 is introduced into the guide groove 8C of the tape holder 8, the molded surface at the tip thereof is made to go around and pulled out through the guide groove 8d, and then the first drawing-out roller 30 is made to go around it. It passes between the first pressing roller 40 and further revolves around this, and then passes between the second pull-out roller 42 and the second suppressing roller 52. After that, motor 3
When the roller 5 is rotated, the reduced rotation is transmitted to the first pull-out roller 30 and the second pull-out roller 42, causing them to rotate slowly. As a result, the tape-shaped grindstone 9 is continuously sent out from the delivery roller 20 and passes through the forming part 8b of the tape holder 8. On the other hand, the outer ring lO
is given a predetermined rotation by a method not shown, and as the tape holder 8 moves in a method not shown along the central axis direction of the outer ring lO, the molded part 8b at the tip of the tape holder 8 aligns with the pole raceway surface. Advance until you reach just below 10a. Thereafter, when the servo motor 12 is started, the pressing plate 17 moves forward, thereby pressing the swinging member 7 and swinging it, causing the tape holder 8 to swing and release its molded portion 8b.
is pressed against the pole raceway surface lOa, and plunge grinding is performed.

At this time, the load generated by the cutting is detected by the pressure sensing means 18, and the rotation of the servo motor 12 is controlled according to a predetermined program so that the load remains at a constant value, and the feed rate is changed. When the predetermined cutting and grinding are completed in this way, the tape holder 8 is
leaves the outer ring lO.

According to such polishing, the tape-shaped grindstone 9 hits the pole raceway surface 10a along the forming surface 8b of the tape holder 8, so that the grindstone surface of an accurate shape is always maintained. Further, as the abrasive grains fall off, the tape-shaped grindstone 9 can continuously supply and use new abrasive grain surfaces.

[Effects of the Invention] As is clear from the above description, according to the present invention, a grinding wheel surface with an accurate shape is always maintained, and the tape-shaped grinding wheel continuously creates a new abrasive surface as the abrasive grains fall off. It can be supplied and used, and efficient and high-precision polishing processing can be easily performed.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the cylindrical cutting head according to the present invention, FIG. 2 is a plan view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. 5 is a sectional view taken along line BB of FIG. 1, FIG. 6 is a sectional view taken along line C-C of FIG. 2, and FIG. 7 shows the tape holder. ) is a front view,
(b) is a plan view, and (c) is a right side view. 7: Swing member, 8: Tape holder, 8a:
Arm portion, 8b: Molded portion, 9: Tape-shaped grindstone, 10: Outer ring, 10a: Pole raceway surface, 1
2: Servo motor, 17: Press plate, 18:
Pressure sensitive sensor, 20: feeding roller, 30: first drawing roller, 42: second drawing roller. Figure 5 Figure 6 Figure 7 (C゛)

Claims (1)

[Claims] A tape holder whose tip is molded into a predetermined shape and whose molded surface is provided with a guide portion for passing a tape-shaped grindstone;
A support member that supports the tape holder and swings or moves linearly, a swinging means for swinging or moving the support member, and a sensor provided between the support member and the swinging means. a pressure means; a delivery roller that winds the tape-shaped grindstone in multiple layers and sends out the tape-shaped grindstone to the tape holder; and a pull-out roller that is powered and rotates to pass through the tape holder and draw out the tape-shaped grindstone. A cylindrical polishing head characterized by: