JPS61159378A - Grinding whetstone - Google Patents

Abstract

PURPOSE:To lessen the wear of a whetstone for edge processing by forming a flat bottom area and another bottom area as stepped down therefrom on the bottom of a whetstone having a cone-shaped cross section, and forming a sloping part between the flat bottom and the stepped-down bottom. CONSTITUTION:Both sides 22 and 26 of a whetstone 15 having a cone-shaped cross section process a workpiece for chamfering. Then, at the time of its edge processing, the surface of a sloping part 24 formed between a deep bottom surface 23 and a bottom surface 25 comes in wide contact with the processing part, and efficiently grinds a workpiece in the direction of Y-axis. Concurrently, the cutting amount of a whetstone 15 per rotation in the direction of X-axis becomes small and its sudden cutting process is avoided, while lessening the wear of the said sloping part 24. In addition, the wear of the bottom surface 25 is almost eliminated. As a result, it becomes possible to improve the processing and dimensional precision of workpiece edges, and its finish precision.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding wheel used when shaping a flat plate to be processed such as a disk shape or a rectangular shape. The present invention relates to a grinding wheel suitable for finishing and chamfering.

[Conventional technology]

Conventionally, this grinding wheel has been used in a grinding device shown in FIGS. 7 and 8. As shown in FIG. 9, the grinding wheel 1 includes a grinding wheel 3 having a cone-shaped cross section on the circumferential end surface of a disc-shaped base metal 2.
is provided. The grinding wheel 1 also has stepped holes 4 arranged on a concentric circle for attaching the grinding wheel 1, and a center shaft for fitting and inserting a spigot shaft 7, which will be described later, and attaching it with precise positional accuracy. A pilot hole 5 is formed. In such a grinding wheel 1, the spigot shaft 7 of the 7 flange 6 is fitted and inserted into the spigot hole 5, and the stepped hole 4 is passed through the female thread formed on the side of the 7 flange 6 and then tightened with the screw 8. The electric motor 9 rotates the grinding wheel 1 through the seven flange 6 by its rotational drive, and is mounted on the stage 10 by fasteners such as bolts. This stage 10 moves freely on the plane of the base 11, and
Its speed can also be controlled. On the other hand, a disk 12 made of glass, plastic, iron, etc., which is a flat plate to be processed, is
It is attached to the surface plate 13 by vacuum suction etc., and this surface plate 1
3 is attached to an electric motor 14, and the rotation of the electric motor 14 rotates the disk 12 via the surface plate 13. Then, while rotating the disk 12 to be processed at a low speed (e.g. 30 m/min) and rotating the grinding wheel 1 at a high speed (e.g. 1200 m/min), the grinding wheel 3 of the grinding wheel 1 contacts the end surface of the disk 12. , move the stage 10.

Next, the grinding process shown in FIG. 10 is performed. First, FIG. 10(a) shows a plunge grinding method in which the cross-sectional mortar shape of the grindstone 3 is directly transferred to the circumferential end surface of the disk 12 to be processed.
In this case, in the above-mentioned rotating state, by pressing the grindstone 3 having a mortar-shaped cross section in one direction against the circumferential end surface of the disk 12 to be processed, the disk 12 to be processed is chamfered with a predetermined dimension and has a radius R (end surface (dimensions). FIG. 10(b) shows that the bottom width W of the grinding wheel 3 is the thickness t of the disk 12 to be processed.
In this case, in the above-mentioned rotating state, the inclined side surface of one side of the grinding wheel 3 (in this example: the upper side in the drawing) is connected to one side of the workpiece disk 12 (in this example: the upper part in the drawing). By pressing this disk 12 against the wave-chamfered portion (upper side), one chamfer C and the radius R
(end face dimension), and then, by moving the grinding wheel 1 in the direction of the rotation axis (↑) on the stage 10, the chamfer C on the other side (lower side in the second drawing of this example) of the disk to be processed 12 is removed. Process.

[Problem that the invention seeks to solve]

The conventional grinding wheel 1 performs grinding based on the above-described structure, and in the case shown in FIG. 10(a), both chamfering and end face machining are performed as shown in FIG. 10(b). In some cases, sharp cuts are made at the same time for chamfering on one side and machining the end face, and in both cases, the grinding wheel 3, which has a mortar-shaped cross section, is subject to severe wear and easily deforms. Therefore, there is a problem in that shape errors are likely to occur in the transferred disk 12 to be processed.

Among the above processes, in the chamfering process shown in FIG. 10(b), by tilting the inclined side surface of the grindstone in a direction parallel to the inclined surface of the chamfer and pressing it against the wave chamfered part,
Although it is possible to reduce the amount of cut and reduce the wear of the inclined side surface portion, it has been impossible to eliminate the above-mentioned defects in end face processing due to the structure of the grinding wheel.

The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional grinding wheel, and an object of the present invention is to provide a grinding wheel that is less likely to change its shape by reducing the wear of the wheel during end face processing. shall be.

[Means for solving problems]

In order to achieve such an object, the grinding wheel of the present invention has a basic shape of a mortar-shaped cross section, and has a flat bottom part and a deep bottom part deeper than this bottom part. , an inclined surface portion is formed between the bottom surface portion and the deep bottom surface portion. In a preferred embodiment of the present invention, both side surfaces of the mortar-shaped cross section are linear or curved inclined surfaces, and the deep bottom surface is flat, semicircular, curved like a U-shape, or 7-shaped. It is. Further, the inclined surface portion between the bottom surface portion and the deep bottom surface portion is preferably linear, but may have any shape such as a curved shape.

[For production]

According to the grinding wheel of the present invention, chamfering is performed on both side surfaces of the grindstone having a mortar-like cross section, and end face dimensions are processed on the inclined surface between the deep bottom surface and the bottom surface at the bottom. The grinding wheel also acts to increase the contact area of the grindstone to the workpiece plate and reduce the machining pressure.

〔Example〕

FIG. 1 and FIG. 2 are a sectional view and a front view, respectively, showing a grinding wheel 15 showing one embodiment of the present invention. The grinding wheel 15 of the present example has an inclined side surface 16° 17 and a bottom surface 18 formed by machining the circumferential end surface of a disk-shaped base metal 2 made of carbon steel, aluminum alloy, etc. into a mortar-shaped cross section as a basic shape. ,
Furthermore, one inclined side surface (this example: inclined side surface 16) and the bottom surface 1
8, a deep bottom surface 19 deeper than this bottom surface 18 is formed, and the slope is extended from one inclined side surface 16 to the deep bottom surface 19, and a new inclined surface 20 is formed from the bottom surface 18 to the deep bottom surface 19. Form. And these faces 16-20
A grindstone 21 containing diamond abrasive grains is brazed to the top of the grindstone 21, and the grindstone 21 has an upper inclined side surface 22, a deep bottom surface 23, an inclined surface 24, a bottom surface 25, and a lower inclined surface. It constitutes the side surface portion 26.

Next, a grinding method using the grinding wheel 15 of this example in place of the grinding wheel 1 in the grinding apparatus shown in FIGS. 7 and 8 will be described with reference to FIG. 3.

In addition, in FIG. 3, only the grinding wheel 15 and the disk to be processed 12 (a Nigarasu disk in this example) are shown.

The grinding wheel 15 and the workpiece disk 12 rotate at high speed (e.g. 1200 TrL/min) and at low speed (e.g.
0 m/min). First, the grinding wheel 21 of the grinding wheel 15 is brought close to the end surface of the disk 12 to be processed by moving the stage 10 described above, and the upwardly inclined side surface portion 22 of the grinding wheel 21 is gradually moved toward the lower chamfered portion of the end surface in the direction of the angle α. Press it against the
Machining the chamfer 27 (Fig. 3(a)→(b)). The angle α may be any angle between the X-axis direction and the Y-axis direction in the XY orthogonal axis coordinates, but preferably the inclined side surface portion 22
is the angle parallel to the plane of Contact between the deep bottom surface portion 23 and the end surface of the disk 12 to be processed is arbitrary, and if they do, that end surface is ground, but this end surface grinding is mainly performed on the next inclined surface portion 24.

Next, in the rotating state described above, the grinding wheel 15 is moved in the Y-axis direction (
Gradually moving upward (in the drawing), the inclined surface portion 24 of the grindstone 21 is pressed against the lower end surface portion of the disk 12 to be processed, and the end surface 28 is processed (FIG. 3(C)→(d))
. In the rotating state in contact with the bottom surface portion 25, the end surface 28
Diameter dimensioning and finishing are performed at the same time.

Next, in the above-described rotating state, the grinding wheel is rotated in the direction of an angle β that is somewhat larger than the inclination angle α of the downwardly inclined side surface portion 26 of the grinding wheel 21 (which is the same as the inclination angle of the upwardly inclined side surface portion 22 in this example). Either the grinding wheel 15 is gradually moved and the inclined side surface 26 of the grinding wheel 21 is pressed against the lower chamfered portion of the disk 12 to be machined to process the lower chamfer 29 (FIG. 3(d)); After moving in the X-axis direction, the
)→Similarly to the processing of the upper chamfer 27 shown in (b), the inclined side surface portion 26 of the grindstone 21 is pressed against the lower chamfered portion of the workpiece disk 12 in the direction of the angle α to process the chamfer 29. (Fig. 3(e)) According to the above-mentioned grinding method,
In upper and lower chamfering, the sloped side surface portion 22.26 is ground at an angle with respect to the portion to be chamfered, so that the etch of the portion to be chamfered comes into contact with the upper and lower ends of the sloped side portion 22.26. After being ground by
Finishing chamfering can be done on the main inner surface of 2°26 to reduce wear. In addition, in the end face machining which is a feature of the present invention, since the part to be machined on the end face is ground in the Y-axis direction using the inclined surface section 24, the contact area with the part to be machined on the end face is increased. In addition to increasing the amount of grinding,
By reducing the depth of cut in the X-axis direction per rotation of the grinding wheel 15, rapid depth of cut can be avoided, the amount of wear on the inclined surface portion 24 can be reduced, and furthermore, the wear on the bottom surface portion 25 can be almost eliminated. Therefore, the machining dimensional accuracy and finishing accuracy of the end face can be improved.

Modifications of the grinding wheel described above include a grinding wheel 30 shown in FIG. 4 in which the deep bottom surface part 31 has a V-shaped cross section, or a semicircular or U-shaped cross section (not shown), etc. It may be configured to have a deep bottom surface with a curved surface, or if it is desired to process eight chamfers, it may be configured to have an inclined side surface 11s33.34 with a curved cross section as shown in the grindstone 32 shown in FIG. . Further, as shown in FIG. 5, the inclined side surface portion 22, deep bottom surface portion 23, inclined surface portion 24, bottom surface portion 25, and inclined side surface portion 26 of the grinding wheel 21 are connected to the respective base metal portions 35, 36, 37, 38, and 39. The base metal 2 may be constructed by surface-joining two pieces provided on the circumferential end faces of the base metal 2.

And 1. The shape of the flat plate to be processed is not limited to a disk shape, but may be a rectangular shape. When using this rectangular plate, a copying cam plate type grinding device is used to rotate the copying cam plate, which has the same or proportional relationship to the rectangular plate shape of the workpiece plate, at the same rotation speed as the workpiece plate. The grinding wheel is rotated simultaneously by the shaft, and the end surface of the copying cam plate is in contact with the cam copying point fixed at a fixed position from the rotating shaft of the grinding wheel. While controlling the distance from the rotation center position If (fixed) to the rotation center position (movement) of the workpiece plate, the workpiece plate is rotated and processed with a grinding wheel while synchronizing with the shape of the workpiece plate. do it.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to reduce the amount of wear by avoiding excessive cutting into the grindstone especially in end face machining, thereby improving the precision of end face machining dimensioning and finishing.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a grinding wheel according to the present invention. FIG. 2 is a front view of the grinding wheel shown in FIG. 1. Figure 3 (a), (b), (c), (d)
and (e) is a process diagram showing a grinding method using the grinding wheel shown in FIG. 1. FIG. 4, FIG. 5, and FIG. 6 are sectional views showing other embodiments of the grinding wheel according to the present invention. FIG. 7 and FIG. 8 are a top view and a front view, respectively, showing a conventional grinding device. FIG. 9 is a sectional view showing a conventional grinding wheel. FIGS. 10(a) and 10(b) are diagrams showing a grinding method using the grinding wheel shown in FIG. 9. 2... Base metal, 21... Grindstone, 22. 26... Inclined side part, 23... Deep bottom surface part, 24... Inclined surface part, 2
5... Bottom part (cl) (b)

Claims (3)

[Claims] (1) In a grinding wheel in which a grinding wheel is provided on a circumferential end surface of a disc-shaped base metal with a conical cross section, the bottom of the conical cross section has a flat bottom surface portion and a deep bottom surface portion deeper than this bottom surface portion. What is claimed is: 1. A grinding wheel characterized in that the grinding wheel is formed with an inclined surface portion between the bottom surface portion and the deep bottom surface portion. (2) The grinding wheel according to claim 1, wherein both side surfaces having a conical cross section are linear or curved inclined surfaces. (3) The grinding wheel according to claim 1 or 2, wherein the deep bottom portion is flat, curved, or V-shaped.