JPH018295Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to an offset type rigid grinding wheel for grinding.

Technical background of the invention Generally, when grinding is performed using an offset type rigid grinding wheel, at the initial stage of use of the grinding wheel,
As shown in Figure 1, the corners of the grinding wheel come into contact with the surface to be ground, resulting in a high grinding speed (grinding amount per unit time) and grinding ratio (ratio of grinding amount to grinding wheel wear amount). It is known that the grinding speed and grinding ratio decrease as the contact state as shown in FIG. 2 approaches.

Furthermore, as the outer diameter of the grindstone decreases due to wear, the circumferential speed decreases, causing a problem in that the grinding speed gradually decreases.

Purpose of the invention The purpose of the invention is to solve the above problems, to increase the grinding speed and grinding ratio, and to make the grinding speed and grinding ratio more uniform from the initial use of the grindstone to the end of use. An object of the present invention is to provide an offset-type rigid grindstone for grinding that can be maintained in a stable condition.

Structure of the invention The object of the invention is to provide a grinding surface with a large number of unevenness consisting of peaks and valleys extending approximately in the circumferential direction, and the unevenness gradually becomes denser from the outer side to the inner side in the radial direction of the grinding wheel. This is achieved by means of an offset-type rigid grinding wheel, which is characterized in that it is provided with a grinding wheel.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to examples shown in the accompanying drawings.

The offset type grinding wheel shown in Figure 3 has the grinding surface 1
It has unevenness consisting of peaks 2 and troughs 3 extending substantially in the circumferential direction. The unevenness can take various forms, such as being provided concentrically with a circle forming the outer shape of the grindstone, or being provided in a spiral shape centered on the center of the grindstone. Moreover, it does not necessarily have to be continuous in the circumferential direction, and a plurality of peaks 2 or troughs 3 may be arranged in parallel in the circumferential direction. The unevenness is provided so as to become gradually denser from the outer side to the inner side in the radial direction of the grindstone.
The depth and density of the unevenness can be determined as appropriate so that the effects described below are achieved.

When grinding is performed using this grindstone, a high grinding speed and grinding ratio can be obtained and maintained as follows. Figure 4 shows a cross section of the grindstone along the axis.
It is also a slightly enlarged view of the unevenness, and the dashed-dotted line in the figure schematically represents the surface to be ground. At the initial stage of use of the whetstone, the contact between the whetstone and the surface to be ground is as shown by the dashed line A, and the corner a of the peak 2
Based on this contact, a large amount of biting into the object to be ground and a large amount of galling can be obtained, and thereby a large grinding speed and grinding ratio can be obtained. Then, when the grinding wheel wears out to a certain extent and the action of the corner a has weakened, the corner b of the next peak 2 comes into contact with the surface to be ground, as shown by the dashed line B, and the grinding speed and grinding ratio are adjusted again. increase. In this way, new corners come into contact with the surface to be cut one after another at a point where the action of one corner is slightly reduced, so that a continuously high grinding speed and grinding ratio can be obtained. In addition, since the unevenness is provided so that it gradually becomes denser from the outer side to the inner side in the radial direction of the grindstone, when the outer diameter is reduced due to wear of the grindstone, the contact between the corner l and the corner Until the contact at point m, the grindstone undergoes only a small amount of wear, as shown from the dashed line L to the line M. Therefore, contact with new peaks is accelerated, so even if the peripheral speed decreases, a high grinding speed and grinding ratio can be maintained, and the grinding speed and grinding ratio can be made uniform from the beginning to the end of the use of the grinding wheel. It will be planned.

To manufacture a grindstone, for example, as shown in FIG. 5, a grindstone material 10 is placed on a lower die 4 with a glass cloth 11 interposed therebetween, and then pressed with an upper die 5 having a female die corresponding to the irregularities of the grindstone. This can be done according to conventional methods.

In addition to making the unevenness have a trapezoidal shape at the peaks and a triangular shape at the valleys as in the above embodiment, the peaks and valleys are made into a triangular shape as shown in FIG. 6 (the unevenness is shown enlarged in the figure). (same in the following figures) or a rectangular shape.

In addition, in order to provide the unevenness toward the inside of the grinding wheel densely, the widths of the peaks 2 and valleys 3 may be gradually narrowed as shown in FIG. By setting the width to a substantially uniform minimum value and gradually narrowing the width of the peak portions 2, it is possible to suppress the reduction in the volume of the grindstone due to the formation of the valley portions 3. In particular, it is desirable for the effective use of the grindstone material to suppress the proportion of the valleys 3 in the outer circumferential portion of the grindstone where the circumferential speed is high by reducing the arrangement density and width thereof.
Furthermore, as shown in FIG. 7, it is also possible to provide the unevenness in a tapered shape that becomes thicker as the grinding wheel goes outward, thereby increasing the volume ratio of the outer periphery of the grinding wheel where the circumferential speed is high. , materials can be used more effectively. Furthermore, when arranging the unevenness gradually densely, the valleys 3 may be made to become gradually shallower as they go inward as shown in FIG. Effects can be obtained and manufacturing is also easy.

Effects of the Invention As is clear from the above, according to the present invention, since the grinding surface has unevenness consisting of peaks and valleys extending approximately in the circumferential direction, the grinding surface is inclined with respect to the ground surface as usual. If a grindstone is used in a gripping manner, as the grindstone wears down, new peaks will come into contact with the surface to be ground one after another, resulting in a large amount of penetration and galling into the object to be ground each time. As a result, it is possible to provide an offset type rigid grinding wheel for grinding which can obtain a high grinding speed and grinding ratio. Moreover, since the irregularities of the rigid grinding wheel are arranged so that they become gradually denser from the outside to the inside in the radial direction of the grinding wheel, as the outer diameter of the grinding wheel decreases due to wear, new peaks become more dense. Since the grinding wheel comes into contact with the surface to be ground quickly, the grinding speed and grinding ratio can be maintained in a more uniform state from the beginning of use of the grindstone to the end of use by compensating for the effect of a decrease in peripheral speed.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of a grinding wheel and a surface to be ground for explaining the prior art, and FIGS. 3 to 8 are views showing embodiments of the present invention, and FIG. 3 is a diagram showing the main points of the grinding wheel. 4 is an enlarged sectional view of the main part of the whetstone shown in FIG. 3, FIG. 5 is an explanatory diagram of the manufacturing method of the whetstone, and FIGS. 6 to 8 are views of other whetstones. It is a sectional view showing the main part of an example. 1... Grinding surface of the whetstone, 2... Peaks, 3... Valleys.

Claims (1)

[Scope of utility model registration request] Grinding characterized by having a large number of unevenness consisting of peaks and valleys extending approximately in the circumferential direction of the grinding surface, and the unevenness is provided so as to become gradually denser from the outer side to the inner side in the radial direction of the grinding wheel. Offset type rigid grinding wheel.