JPH03228558A - Surface grinding method and grinder thereof - Google Patents

Abstract

PURPOSE:To better and improve a grinding property and a grinding accuracy, by performing the flat grinding of the body to be ground inside a carrier ring while dressing the flat grinding faces of at least two grinding grindstones with the rotation of a dresser. CONSTITUTION:A ring like dresser 19 is mounted on the circumferential track passing the about center part of the flat grinding faces 3a, 3a of at least two grinding grindstones 3, 3 over thereon and also the body W to be ground of the carrier ring 11 inside fixed respectively on the flat grinding faces 3a, 3a while dressing the flat grinding faces 3a, 3a by rotating the dresser 19 together with the grinding grindstones 3, 3. With this structure the flatnesses of the flat grinding faces 3a, 3a are maintained at high accuracy, the grinding properties of the bodies W to be worked in various shapes of comparatively small sizes can be bettered and improved and the grinding accuracy can also be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and a grinding apparatus for surface grinding relatively small objects of various shapes.

(Prior art and problems to be solved) Conventionally, when surface grinding a relatively small workpiece of various shapes with a surface grinder, the workpiece is forcibly chucked with a magnetic chuck. However, this method of forcibly chucking the workpiece with a magnetic chuck does not allow for the distortion that occurs during chucking and the distortion that occurs during grinding because the workpiece is relatively small and has various shapes. Due to the internal distortion caused by the influence of grinding heat, the object to be ground has a considerable dimensional deviation when removed from the magnetic chuck after grinding, causing a problem in which the grinding accuracy is significantly reduced.

In order to solve the above-mentioned problems, we installed three grinding wheels whose upward facing surfaces were the same horizontal grinding surfaces.
A ring-shaped object to be ground is placed over the grinding surfaces of three grinding wheels, and a support roller provided outside the three grinding wheels guides the outer periphery of the ring-shaped object to perform surface grinding. It has been devised. (Refer to Japanese Patent Publication No. 53-155.) However, although this product can solve the problems with the magnetic chuck, it is possible to grind the ring-shaped workpiece by placing it on the grinding surfaces of three grinding wheels. Therefore, the objects to be ground that can be ground are inevitably limited, and a new problem arises in that, as mentioned above, it is difficult to grind relatively small objects of various shapes.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a surface grinding method and a grinding device thereof, which can solve the above-mentioned conventional problems and improve grindability and grinding accuracy. It is.

(Means for Solving the Problems) In order to achieve the above object, the method of the present invention includes a grinding device in which at least two grinding wheels are arranged side by side with their flat grinding surfaces aligned on the same plane. Then, a ring-shaped dresser is mounted on a circumferential orbit passing approximately through the center of the flat grinding surfaces of both grinding wheels, and an object to be ground is placed on the flat grinding surfaces of each of the grinding wheels. A plurality of carrier rings to be accommodated are placed in place, a workpiece to be ground is placed on a flat grinding surface within the carrier ring, and the dresser is rotated together with the grinding wheel to dress the flat grinding surface of the grinding wheel while the object is being ground. The gist is to perform surface grinding of the object to be ground within a carrier ring.

Further, the apparatus of the present invention includes at least two grinding wheels arranged in parallel with their flat grinding surfaces aligned on the same plane, a means for rotationally driving each of the grinding wheels, and a flat grinding tool for each of the grinding wheels. A carrier ring that is arranged at multiple locations on a surface and accommodates objects to be ground; and a ring-shaped dresser that is mounted on a circumferential orbit that passes approximately through the center of the flat grinding surface of both front grinding wheels. The main purpose of this study is to have the following.

(Function) A ring-shaped dresser is mounted on a circumferential orbit passing approximately at the center of the flat grinding surfaces of at least two grinding wheels, and the dresser is rotated together with the grinding wheels to remove the flat grinding surfaces. While dressing the workpiece, the workpiece is accommodated and mounted in carrier rings placed on each of the flat grinding surfaces, and the workpiece is subjected to surface grinding.

(Example) Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

First, to explain the grinding device of this example, in the figure, 1 indicates the entire twin-disc grinding machine, and within the almost upper part of the box-shaped frame 2, two grinding wheels 3, 3 are arranged at a predetermined interval. They are placed side by side. Both grinding wheels 3.
3 each has a disk shape with a desired thickness and a hole in the center.
The grinding wheel shaft 5.5 is formed in the shape of a ring (also referred to as a ring shape), and its upper surface has wide flat grinding surfaces 3a, 3a, and a grinding wheel shaft 5.5 is suspended from the lower surface via a disc-shaped base 4.4. 5
．． 5 is the bearing means 6 for the upper plate 2a of the frame 2.
．． It is rotatably supported by 6. Both of the grinding wheels 3.3 are set so that their flat grinding surfaces 3a, 3a are aligned on the same plane (horizontal plane), and the lower end of the grinding wheel shaft 5.5 is located approximately on the frame 2. A driven pulley 7.7 is mounted located in the lower part.

In the lower part of the frame 2, drive motors 8, 8 corresponding to the grinding wheel 3.3 are mounted by suitable mounting means with the motor shaft facing downward, and a drive pulley 9.3 is attached to the motor shaft. 9 is installed. A belt 10.1 is attached to the driving pulleys 9, 9 and the driven pulley 7.7.
0 is hung, so that both grinding wheels 3.3 are rotated by the drive motors 8, 8 in the same direction (clockwise in the figure).

In the front dual grinding wheel 3.3, its flat grinding surface 3a,
Carrier rings 11 to 11 are rotatably placed at a plurality of locations (two locations in the figure) on 3a, respectively, and each carrier ring 11 to 11 has an inner diameter that is equal to the width of the flat ground surface 3a, for example. That is, the width from the hole diameter to the outer diameter of the grinding wheel 3 is approximately equal to the width, and the carrier holding means 12 to 12 are arranged facing the outer circumferential side that opposes the rotational direction of the grinding wheel 3.

Each carrier holding means 12 is for holding each of the carrier rings 11 to 11 in a mounted state, and is opposed to the outer periphery of the grinding wheel 3, and is positioned vertically from the upper plate 2a of the frame 2 via the bracket 13. A support bin 14 that is adjustable and erected, and a support bin 14 that extends along the width direction (radial direction) of the flat grinding surface 3a of the grinding wheel 3.
a support plate 15 attached to the upper end; and a support plate 15 in sliding contact with the outer periphery of the carrier ring 11.
A holding O-ra 1 rotatably supported on the base and one end of the
6 and 16, and is configured to guide the rotation of the carrier ring 11 by means of a holding roller 16 and 16, and to maintain a fixed position with respect to the flat grinding surface 3a.

A plurality of (four shown in the figure) guide rollers 17 to 17 for guiding the rotation of a ring-shaped dresser, which will be described later, are mounted on both sides of the opposing intermediate outer portions of the grinding wheels 3.3 on the frame 2. The plate 2a is erected via brackets 18-18.

The ring-shaped dresser 19 is made of, for example, a diamond grindstone, and as shown in FIG. The grinding wheel 3.3 is mounted so as to be located on a circumferential orbit passing approximately through the center of the grinding wheel 3.
In this riding state, the outer periphery of each of the guide rollers 1
Rotation is guided by sliding contact with parts 7 to 17.

Next, the grinding device of this embodiment configured as described above,
That is, an embodiment of the present invention will be described along with the operation of the twin disc grinder 1.

Now, the ring-shaped dresser 19 is placed on the flat grinding surfaces 3a, 3a of both grinding wheels 3.3.
After mounting the grinding wheels 3.3 on the grinding wheels 3.3 in close contact so as to be positioned on a circumferential orbit that passes through approximately the center of the grinding wheels 3.3, the drive motors 8, 8 for each grinding wheel 3.3 are driven. Then, the grinding wheels 3, 3 are rotated in the same direction (clockwise in the drawing) via the drive pulley 9.9, the belt 1o, the driven pulley 7.7, and the grindstone shafts 5, 5.

Then, the ring-shaped dresser 19 is brought into close contact with both the flat grinding surfaces 3a, 3a due to its own weight, and the ring-shaped dresser 19 is attached to both the grinding wheels 3.
Both are rotated in the same direction (clockwise direction in the figure) by the rotation component of No. 3. As a result, both flat ground surfaces 3a, 3a are dressed uniformly, and the same plane (horizontal surface) state of both flat ground surfaces 3a, 3a is always maintained, thereby ensuring flatness with perfect precision. In this case, the ring-shaped dresser 1
9 is guided in its rotation by respective guide rollers 17 to 17.

On the other hand, the respective carrier rings 11 to 11 on the flat grinding surfaces 3a, 3a of both grinding wheels 3.3 are connected to the aforementioned dresser 19 within the width from the diameter of the hole of the grinding wheels 3 to the outer diameter.
Similarly, both are rotated in the same direction (clockwise in the drawing) by the rotational force of the grinding wheel 3. In this case, the carrier rings 11 to 11 are prevented from being displaced in the rotational direction of the grinding wheel 3 by the carrier holding means 12, so that they are maintained in a fixed position on the flat grinding surface 38.3a, as described above. The rotation is guided by the holding rollers 16, 16 of the carrier holding means 12.

Therefore, a relatively small workpiece W of various shapes to be surface ground (hereinafter also simply referred to as workpiece W) is placed on a flat grinding surface 3.
After being accommodated and placed in each of the carrier rings 11 to 11 on a and 3a, when the grinding wheel 3.3 is driven to rotate,
As described above, the object W to be ground is inscribed in the carrier rings 11 to 11 which are rotated, and is ground while being rotated by cutting pressure due to its own weight and additional weight, ie surface grinding in a so-called lapping state.

In this case, the flat ground surfaces 3a, 3a are constantly dressed by the dresser 19 as described above.

In this way, in this example, while constantly dressing the flat ground surfaces 3a, 3a of the grinding wheel 3.3, relatively small shapes of various shapes are formed using the width of the flat ground surfaces 3a, 3a. The grinding object W can be surface ground.

In addition, in this embodiment, each carrier ring 11 to 1
1 can be held in a slightly floating state from the flat grinding surfaces 3a, 3a, and the carrier rings 11 to 11 can be configured to actively rotate separately from the rotation of the grinding wheels 3, 3. By adopting this configuration, and by increasing the diameter of the grinding wheels 3.3, the flat grinding surfaces 3a of the grinding wheels 3,3.

By increasing the number of carrier rings 11 to 11 arranged with respect to 3a, the productivity of grinding this type of object W to be ground can be significantly improved.

(Effects) As described above, the present invention has a ring-shaped dresser mounted on a circumferential orbit passing approximately at the center of the flat grinding surfaces of at least two grinding wheels, and the grinding wheels While dressing the flat grinding surface by rotating the dresser at the same time, the object to be ground can be placed in carrier rings placed on each of the flat grinding surfaces, and the object to be ground can be subjected to surface grinding.

This makes it possible to maintain the flatness of the flat grinding surface with high precision, thereby improving the grindability and grinding accuracy of comparatively small objects of various shapes.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a plan view showing the entire grinding device, Fig. 2 is a sectional view taken along the line ■-■ of Fig. 1, and Fig. 3 is a sectional view taken along the line
The figure is an enlarged perspective view showing the carrier ring and carrier holding means. 3... Grinding wheel 3a... Flat grinding surface 8... Drive motor 11... Carrier ring 12... Carrier holding means 19... Dresser W... Object to be ground

Claims (1)

[Scope of Claims] 1. In a grinding device in which at least two grinding wheels are arranged side by side with their flat grinding surfaces aligned on the same plane, a grinding wheel located substantially centrally on the flat grinding surfaces of both grinding wheels. A ring-shaped dresser is mounted on a circumferential orbit passing through the grinding wheel, and carrier rings for storing objects to be ground are placed at multiple locations on the respective flat grinding surfaces of each of the grinding wheels. The object to be ground is surface-ground within the carrier ring while the object to be ground is placed on the grinding surface and the dresser is rotated together with the grinding wheel to dress the flat grinding surface of the grinding wheel. surface grinding method. 2. At least two grinding wheels whose flat grinding surfaces are aligned and arranged side by side on the same plane, a means for rotationally driving each of the grinding wheels, and a plurality of locations arranged on each flat grinding surface of each of the grinding wheels. and a carrier ring for accommodating the object to be ground, and a ring-shaped dresser mounted on a circumferential orbit passing approximately through the center over the flat grinding surfaces of both grinding wheels. Grinding equipment.