JP2000317799A - Outer diameter flange two-surface concurrent grinding method and its grinding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity and to automatically carry-in/out a work by rotating the work via the rotation of an electromagnetic chuck while supporting it with a shoe, bringing a pair of rotary grinding wheels into contact with both faces of the outer diameter flange of the rotating work, and concurrently grinding both faces of the outer diameter flange. SOLUTION: In a work rotation system constituted of a shoe 17 and an electromagnetic chuck 8, two wheel spindle stock devices 2, 3 concurrently grinding both faces of the outer diameter flange Wa of a work W are arranged apart in the diameter direction and combined. Workability is good, and mechanisms can be reasonably arranged. The work W is rotated by the electromagnetic chuck 8 while being supported by the shoe 17, and the carried-in work W is positioned by the shoe 17. When the carrying-in of the work W is automated, any loader device capable of feeding the work W onto the shoe 17 may be used, and the loader device can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention grinds both surfaces of an outer diameter flange of a work having an outer diameter flange, for example, an inner ring of a self-aligning roller bearing, an inner ring of a double row tapered roller bearing, and the like at the same time. The present invention relates to a method for simultaneously grinding two outer diameter flanges and a grinding machine therefor.

[0002]

2. Description of the Related Art Conventionally, an outer diameter flange serving as a middle flange of an inner ring of an ultra-large spherical roller bearing is first ground by grinding one surface of the outer diameter flange. After that, the work was turned over and the other surface of the outer diameter flange was ground. As described above, in the conventional grinding method, the outer diameter flange serving as the inner flange of the inner ring can be ground only on one side at a time, and the reversing operation is required. Also, it was difficult to obtain a high degree of parallelism on both sides of the outer diameter flange due to a subtle difference in the gripping state of the workpiece due to the reversal.

For this reason, the simultaneous grinding of the outer diameter flange using a conventional cylindrical grinding machine for simultaneous machining of two surfaces shown in FIG. 5 has been considered. According to the grinder shown in the figure, the work W can be sandwiched between the main shaft 51 and the center 52, and the left and right rotary grindstones 53 can simultaneously grind both surfaces of the outer diameter flange Wa of the work W.
However, since the work W is sandwiched between the spindle 51 and the center 52, when the loading and unloading of the workpiece W is automated, the workpiece W is supplied to the spindle 51 so that the workpiece W is accurately loaded into the axial center position of the spindle 51. Loader device (not shown)
And the configuration of the loader device becomes complicated. Further, when the work W is attached or detached, it is necessary to move the center 52 forward and backward in synchronization with the loader device, and there is a problem that it takes time to carry in and carry out. Further, since the pair of rotary grindstones 53, 53 are arranged so as to sandwich the grindstone of the work W, it is necessary to avoid interference of the grindstone table device for moving the rotary grindstones 53, 53 forward and backward. Therefore, it is necessary to reduce the size of the grindstone device,
There is a problem that it is difficult to secure the rigidity, which also makes high-precision processing difficult.

SUMMARY OF THE INVENTION It is an object of the present invention to be able to simultaneously process both surfaces of an outer diameter flange, to achieve high productivity and to automate the loading and unloading of a workpiece without using a complicated loader device. An object of the present invention is to provide a method for simultaneous grinding of two outer diameter flanges and a grinding machine therefor. Another object of the present invention is to be able to simultaneously process both surfaces of the outer diameter flange, to improve productivity, and to achieve high accuracy without disturbing the arrangement of the grindstone device of the rotary grindstone for performing the processing of both surfaces. It is an object of the present invention to provide a method for simultaneous grinding of two outer-diameter flanges capable of performing various types of processing and a grinding machine therefor.

[0005]

According to a first method of simultaneously grinding two outer diameter flanges of the present invention, a work having an outer diameter flange is supported by a shoe, and the end face of the work is rotated by the rotation of an electromagnetic chuck that has attracted the work. This is a method in which a pair of rotating grindstones are respectively brought into contact with both surfaces of the outer diameter flange of the rotating work to simultaneously grind both surfaces of the outer diameter flange. According to this method, since the work is rotated by the electromagnetic chuck while the work is supported by the shoe, the loaded work is positioned by the shoe. Therefore, in order to automate the loading of the work, the loader device only needs to be able to supply the work onto the shoe, and a mechanism for positioning the work with high precision is not required, and the loader device has a simple configuration. Also,
Since both surfaces of the outer flange of the work are simultaneously ground, the grinding time can be reduced by half and the work does not need to be turned over, so that the cycle time of the grinding can be shortened and the productivity is improved.

According to a second method of simultaneously grinding two outer-diameter flanges of the present invention, a pair of rotations are performed on both surfaces of an outer-diameter flange of a work at locations circumferentially separated from each other while rotating the work having the outer-diameter flange. This is a method in which grinding wheels are brought into contact with each other to simultaneously grind both surfaces of the outer diameter flange. According to this method, since the rotating grindstones for grinding both surfaces of the outer diameter flange are arranged apart from each other in the circumferential direction of the work, the arrangement of the grindstone head devices for both rotating grindstones does not occur, so that these grindstone head devices are used. Has sufficient rigidity to perform high-precision machining.

The first and second two-surface simultaneous grinding methods can be used together. That is, while supporting the work having the outer diameter flange by the shoe, the end face of the work is rotated by the rotation of the electromagnetic chuck that has been attracted, and a pair of outer circumferential flanges of the rotating work are provided on both sides of the outer circumference at positions separated from each other in the circumferential direction. The rotating grindstones may be brought into contact with each other to grind both surfaces of the outer diameter flange simultaneously. In that case, both effects of the first and second grinding methods can be obtained simultaneously.

In the present invention, the shoe may have an offset amount. That is, the axis of the work supported by the shoe is offset from the rotation center of the electromagnetic chuck by a fixed amount to give an offset amount. By giving the offset amount to the shoe in this way, a suction force for pressing the work against the shoe is always applied to the work from the electromagnetic chuck. For this reason, the support of the work is stabilized, and the grinding process with higher accuracy can be performed.

In the present invention, the pair of rotary grindstones may be located at positions separated from each other by 180 degrees with respect to the circumferential direction of the work sucked by the electromagnetic chuck. As described above, when the pair of rotating stones is set at a position 180 degrees apart,
Since the rotating grindstones on both sides can be arranged symmetrically while displacing the arrangement of the pair of rotating grindstones, the assembling and control of the grindstone device for both rotating grindstones is simplified.

[0010] The first outer diameter double-faced simultaneous grinding machine of the present invention has a shoe for rotatably supporting a work having an outer diameter flange in contact with the outer diameter surface and an electromagnetic chuck at a tip of a main shaft. A work rotating device for rotating the work in a state supported by the shoe by suctioning an end face of the work with an electromagnetic chuck, and contacting both outer diameter flanges of the work rotated by the work rotating device with these outer diameters. It comprises a pair of rotating grindstones for simultaneously grinding both sides of the flange. According to this configuration, grinding can be performed by the first two-surface simultaneous grinding method of the present invention.

According to a second embodiment of the present invention, there is provided a simultaneous grinding machine having two outer diameter flanges, the work rotating device for rotating a work having an outer diameter flange, and both surfaces of the outer diameter flange of the work rotated by the work rotating device. A pair of rotating grindstones that are in contact with each other at circumferentially distant positions and simultaneously grind both surfaces of the outer diameter flange with each other. According to this configuration, it is possible to perform the grinding by the second two-surface simultaneous grinding method of the present invention.

[0012] The first and second outer-diameter flange dual-surface simultaneous grinding machines can be fused with each other. That is, a shoe having an outer diameter flange and rotatably supporting a work having an outer diameter surface in contact with the outer diameter surface thereof, and an electromagnetic chuck at a tip of a main shaft, wherein an end face of the work is attracted by the electromagnetic chuck to attach the work to the shoe. The workpiece rotating device that rotates in a state supported by the workpiece rotating device and the outer diameter flange of the workpiece rotated by the workpiece rotating device are in contact with each other at positions circumferentially separated from each other. It is also possible to use a two-sided outer-diameter flange simultaneous grinding machine provided with a pair of rotating grindstones for grinding.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. First, the configuration of the two outer diameter flange simultaneous grinding machines will be described. As shown in a plan view in FIG. 1, the grinding machine includes a work rotating device 1 for holding and rotating a work W.
A pair of grinding wheel units 2 and 3 installed on both sides of the work rotating device 1, a shoe mechanism 4 for supporting the work W rotated by the work rotating device 1 from below, and a base 5 on which these are installed. Is provided. Further, a control device 30 for numerically controlling the wheel head devices 2, 3 and the like is provided.

The work rotating device 1 is such that a spindle 7 is rotatably installed on a headstock 6 fixedly installed on a base 5, and an electromagnetic chuck 8 is provided at a tip of the spindle 7. The spindle 7 is
The main shaft motor 9 is driven to rotate. The electromagnetic chuck 8 sucks the work W at the tip of a nose piece 8a attached to the front surface. A plurality of types of nosepieces 8a corresponding to the diameter and width of the work W are prepared, and the desired nosepiece 8a is exchangeably mounted on the electromagnetic chuck 8. Also, the electromagnetic chuck 8
Has a function of adsorbing the work W such that the center of the work W is positioned at the rotation center.

The grindstone units 2 and 3 are respectively provided with rotating grindstones 10 and
The rotary grinding wheel 11 is rotated, and the rotary grindstones 10 and 11 are provided with a cutting feed operation along the rotation axis and a cutting operation in a direction orthogonal to the rotation axis. Wheel head unit 2,
Numeral 3 denotes a whetstone spindle 12 on which the rotating whetstones 10 and 11 are respectively installed, a cutting slide 13 in the X-axis direction on which the whetstone spindle 12 is installed, and a cutting in the Z-axis direction on which the cutting slide 13 is mounted. Slide table 14
And Each grindstone spindle 12 has a rotating grindstone 10,
11 grinding wheel shafts 10a, 11a to the spindle housing 1
2a is rotatably installed, and is rotationally driven by a grinding wheel rotation motor 15 via a belt.

The cutting slide base 13 is mounted on the cutting slide base 14 so as to be movable in the cutting direction of the rotary grindstones 10 and 11, and is driven forward and backward by a forward and backward driving device (not shown) including a servomotor and a ball screw. Is done.
The notching slide table 14 is provided on the base 5 with the rotating grindstones 10 and 1.
It is installed so that it can move forward and backward along the axial direction of 1.
It is driven forward / backward by a forward / backward drive device (not shown) including a servomotor and a ball screw. The rotating grindstone 1 is located on the base 5 in the vicinity of each cutting slide base 14.
A dressing device 18 for setting and shaping 0 and 11 is provided. These dressing devices 18 are arranged so that the rotating grindstones 10 and 11 can come into contact with each other by the movement of the cutting slide table 13 and the cutting slide table 14.

Each of the grindstone head devices 2 and 3 grinds one side and the other side of the outer diameter flange Wa of the work W attracted to the electromagnetic chuck 8 by rotating grindstones 10 and 11, respectively. The rotation axes of the grindstones 10 and 11 are located in the same horizontal plane as the rotation axis of the main shaft 7 of the work rotating device 1 and are set so as to be inclined at a predetermined angle, for example, 45 degrees with respect to the rotation axis of the main shaft 7. I have. The two grinding wheel head devices 2 and 3 are for grinding a position 180 degrees apart from each other in the circumferential direction of the work W, and one of the grinding wheel head devices 2 (the left side in FIG. 1) has a tip of the grinding wheel shaft 10a. Is installed so as to cut in a direction away from the electromagnetic chuck 8, and the rotating grindstone 10 grinds the surface of the workpiece W on the chuck side in the outer diameter flange Wa. The other (the right side in FIG. 1) grindstone table device 3 is installed so that the tip of the grindstone shaft 11 a is cut in a direction approaching the electromagnetic chuck 8, and the rotating grindstone 11 is driven by the electromagnetic force at the outer diameter flange Wa of the workpiece W. The surface opposite to the chuck 8 is ground. The advancing and retreating directions of the cutting slide tables 14 and 14 of the two grindstone table apparatuses 2 and 3 are parallel to each other, and the advancing and retreating directions of the cutting slide tables 13 and 13 are also parallel to each other.

As shown in FIG. 2, the shoe mechanism 4 has two shoe holders 18 and shoes 17 mounted on a shoe base 16 so that the mounting positions thereof can be changed. The shoe 17 supports the work W in contact with the outer diameter surface, and may support the work W by sliding contact. In this example, the plurality of rolling elements 17a provided at the tip end work the work W.
Are supported by rolling contact. Each rolling element 1
Reference numeral 7a is a roller or a ball, and is provided side by side in the circumferential direction and the axial direction of the work W. The shoe base 16 has an arc-shaped guide portion 16a, and the mounting position of each shoe 17 can be changed along the guide portion 16a in the arc direction of the guide portion 16a.
The mounting position of the shoe base 16 can be changed relative to the base 5 in, for example, the front-back direction or the up-down direction. A plurality of types of shoe holders 18 according to the work size may be prepared, exchanged and mounted, and a plurality of types of shoe holders 18 according to the work size may be prepared for the shoe 17 and the same shoe holder 18 may be provided. Use, shoe 1
7 may be replaced and attached.

The work W is the inner ring 21 of the self-aligning roller bearing 20 shown in FIG. The self-aligning roller bearing 20 shown in FIG. 1 has barrel-shaped rollers 23, 23 arranged in two rows between an inner ring 21 and an outer ring 22.
Holders 24, 24 are provided for 3, 3, 23, respectively.
The inner ring 21 has flanges 21a and 21b at the center and both ends in the width direction, and the outer ring 22 has a spherical inner surface.
In the grinding machine and the grinding method of FIG. 1, the outer diameter flange Wa that is the middle flange 21 a of the inner ring 21 is ground.

Next, a grinding method will be described. First,
The nosepiece 8a, the shoe 17, and the shoe base 16 of the electromagnetic chuck 8 are set according to the diameter and width of the work W. In this case, the nose piece 8a is replaced with a nose piece 8a corresponding to the work size. As for the shoe 17,
The mounting position may be changed according to the work size. If the mounting position of the shoe 17 with respect to the shoe holder 18 can be changed, the mounting position is changed according to the work size. The shoe 17 gives the offset amount A. That is, the axis O2 of the work W supported by the shoe 17 is shifted by a fixed amount (to the right in this example) with respect to the rotation center O1 of the electromagnetic chuck 8, and the offset amount A of the shoe 17 is given. The offset amount A is, for example, about 0.15 mm.
Thereby, suction to the work W is provided.

The dressing device 19 causes the rotating grindstones 10 and 1 to rotate.
Perform angle shaping of 1. In addition, the angle shaping is performed by simultaneously controlling the NC slides 13 and 14 for the NC slides, thereby shaping to an arbitrary angle. Next, the work W is placed on the shoe 17 and the nose piece 8a is
And the rotating whetstones 10 and 11 on both sides of the work W
Is set in the control device 30. After this,
The grinding allowance by the rotary grindstones 10 and 11 on both sides is set in the control device 30 to perform the grinding.

The processing operation is controlled by the control device 30 as follows. When the cycle start button on the operation panel of the control device 30 is pressed, the grindstone spindles 12 of the grindstone head devices 2 and 3 on both sides rotate. Next, the cutting slide table 1
When the rotary grindstones 10 and 11 move to a position just before the set grinding point, the main shaft 7 of the work rotating device 1 starts rotating. . Thereafter, the cutting slide tables 13 and 14 advance by the biaxial control at the set cutting speed from the grinding point, and a predetermined grinding cycle is performed. When the grinding is completed, the cutting slide table 13 and the cutting slide table 14 return to the origin positions, and the grinding wheel spindle 12 and the work rotating device 7 stop rotating. The grindstone units 2 and 3 on both sides perform the same operation as each other, and
The both surfaces of the outer diameter flange Wa of the workpiece W which is gripped and rotated at the same time are simultaneously ground.

According to the grinding machine and the grinding method, since both surfaces of the outer diameter flange Wa of the work W can be ground at the same time, the grinding time is reduced by half and the productivity is improved.
Further, since the work W does not need to be inverted, the operation time for attaching and detaching the work W is shortened, and the productivity is further improved. For these reasons, the cycle time of the grinding process is reduced. In addition, since there is no operation of flipping and holding, the outer diameter flange W
The processing quality such as the parallelism of both surfaces of a is improved.

Further, the shoe 17 and the electromagnetic chuck 8
Is combined with a configuration in which the two grindstone units 2 and 3 are arranged apart in the diametrical direction, so that workability is good and arrangement of each mechanism can be performed without difficulty. That is, since the work W is rotated by the electromagnetic chuck 8 while being supported by the shoe 17, the loaded work W is positioned by the shoe 17. Therefore, a loader device (not shown) is used to automate the work loading.
Any device can be used as long as it can supply the work W onto the shoe 17, a mechanism for positioning the work W with high accuracy is not required, and a loader device having a simple configuration is sufficient. In addition, since the rotating grindstones 10 and 11 for grinding both surfaces of the outer diameter flange Wa are arranged apart from each other in the circumferential direction of the workpiece W, a grindstone spindle 12 for rotating the rotating grindstones 10 and 11 and a cut for moving the grindstone spindle 12 are provided. The arrangement of the slide table 13 and the notch slide table 14 does not cause any excessive force, and therefore, these mechanisms have sufficient rigidity so that high-precision machining can be performed. further,
In this embodiment, since the offset amount A is applied to the shoe 17, a suction force for pressing the work W against the shoe 17 is always applied to the work W from the electromagnetic chuck 8. Therefore, the support of the work W is stabilized,
More accurate grinding can be performed.

In the above-described embodiment, the case where the work W is the inner ring of the self-aligning roller bearing has been described. However, the grinding method and the grinder according to the present invention serve as the middle flange of the inner ring of the double-row tapered roller bearing. Grinding of two flanges can be performed simultaneously on an outer diameter flange or a cylindrical work having a flange on another outer diameter surface.

[0026]

According to the first method of simultaneously grinding two outer diameter flanges and the grinding machine of the present invention, a work having an outer diameter flange is rotated by the rotation of an electromagnetic chuck while a work having an outer diameter flange is supported by a shoe. Since a pair of rotating grindstones are respectively brought into contact with both surfaces of the outer diameter flange to simultaneously grind both surfaces of the outer diameter flange, the workpiece can be loaded and unloaded without using a loader device having a high productivity and a complicated configuration. The unloading can be automated. The second outer diameter flange two-surface simultaneous grinding method and the grinding machine according to the present invention, while rotating a work having an outer diameter flange, provide a pair of circumferentially separated positions on both surfaces of the outer diameter flange of the work. The two grinding wheels are brought into contact with each other to simultaneously grind both sides of these outer diameter flanges, so productivity is high. However, high-precision processing becomes possible.

[Brief description of the drawings]

FIG. 1 is a cutaway plan view of an external diameter flange two-surface simultaneous grinding machine according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing a shoe of the grinding machine.

FIG. 3 is a rear view showing a relationship between the shoe and a rotary grindstone.

FIG. 4 is a cross-sectional view of a bearing using a work to be ground by the grinding method and the grinding machine.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Work rotating device 2, 3 ... Grinding wheel stand device 4 ... Shoe mechanism 7 ... Spindle 8 ... Electromagnetic chuck 8a ... Nose piece 10, 11 ... Rotating grindstone 12 ... Grinding stone spindle device 13 ... Cutting slide stand (X direction) 14 ... Cutting Slide table (Z direction) 16 ... Shoe base 17 ... Shoe 18 ... Shoe holder W ... Work Wa ... Outer diameter flange

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Atsushi Kobayashi 2454 Tsuchishima, Tsujishima, Oaza, Kuwana-shi, Mie Prefecture AB04 CA01 CB03

Claims (8)

[Claims] 1. A work having an outer diameter flange is supported by a shoe, and the end face of the work is rotated by the rotation of an electromagnetic chuck, and a pair of rotating stones are brought into contact with both surfaces of the outer diameter flange of the rotating work. A method of simultaneous grinding of two outer diameter flanges for simultaneously grinding both surfaces of these outer diameter flanges. 2. While rotating a work having an outer diameter flange, a pair of rotating grindstones are respectively brought into contact with circumferentially distant portions on both surfaces of the outer diameter flange of the work, and both surfaces of the outer diameter flange are brought into contact with each other. A method of simultaneous grinding of two outer diameter flanges for simultaneous grinding. 3. A work having an outer diameter flange is supported by a shoe, and the end face of the work is rotated by the rotation of an electromagnetic chuck which attracts the work. , A pair of rotating grindstones are respectively brought into contact with each other to simultaneously grind both surfaces of the outer diameter flanges simultaneously. 4. The method for simultaneously grinding two outer-diameter flanges according to claim 1 or 3, wherein the axis of the workpiece supported by the shoe is offset by a fixed amount with respect to the rotation center of the electromagnetic chuck. . 5. The outer diameter flange 2 according to claim 1, wherein the pair of rotary grindstones are located at positions 180 degrees apart from each other with respect to a circumferential direction of the work attracted to the electromagnetic chuck.
Surface simultaneous grinding method. 6. A shoe for rotatably supporting a work having an outer diameter flange in contact with an outer diameter surface thereof, and having an electromagnetic chuck at a tip of a main shaft, wherein an end face of the work is attracted by the electromagnetic chuck to attract the work. A work rotating device that rotates the work in a state supported by the shoe, and a pair of rotating grindstones that respectively contact both surfaces of the outer diameter flange of the work rotated by the work rotating device and simultaneously grind both surfaces of the outer diameter flange with each other. Equipped with two outer diameter flange simultaneous grinding machines. 7. A work rotating device for rotating a work having an outer diameter flange, and both surfaces of the outer diameter flange of the work rotated by the work rotating device are respectively in contact with each other at positions circumferentially separated from each other. An outer diameter flange dual-surface simultaneous grinding machine comprising a pair of rotary grindstones for simultaneously grinding both surfaces of an outer diameter flange. 8. A work piece having an outer diameter flange and rotatably supporting a work having an outer diameter surface, and an electromagnetic chuck at a tip of a main shaft, wherein an end face of the work is attracted by the electromagnetic chuck to attract the work. And a work rotating device for rotating the work in a state of being supported by the shoe, and both surfaces of the outer diameter flange of the work rotated by the work rotating device are respectively contacted at positions circumferentially separated from each other, and both surfaces of these outer diameter flanges Outer diameter double-face simultaneous grinding machine comprising a pair of rotary grindstones for simultaneously grinding the same.