JPH06344266A - Cup-type grinding wheel - Google Patents

Abstract

PURPOSE:To obtain a high grade machined surface without cracks by connecting the outer peripheral surface or the inner peripheral surface to the end face working plane with an inclined surface of such a very small angle that the cut is maximum at the end face working plane. CONSTITUTION:An inclined surface 9 of a very small angle is formed between the end part 6 of an end face working surface 5 and the corner part 8 of the outer peripheral surface 7 in a cup-type grinding wheel 2. The height of the corner part 8 to the end face working plane 5 is taken to be H, and an angle between the inclined surface 9 and the end face working plane 5 is taken to be theta. The cut (t) of the grinding wheel 2 is made smaller than the height H, and the feed speed for a workpiece 3 is taken to be (f). Accordingly, the workpiece 3 is worked by very small quantity each sequentially by abrasive grains nearer to the outer peripheral surface 7 on the inclined surface 9 to be ground to the depth of cut (t) of the grinding wheel finally. It is preferable that the height H is about 0.2-1mm and the angle theta is about 0.5-5 degrees of arc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cup-shaped grindstone.

[0002]

2. Description of the Related Art When a workpiece is front-face ground with a cup-shaped grindstone, a predetermined cutting amount t is given and both are relatively moved at a predetermined feed speed f in a direction perpendicular to the cutting direction.

[0003]

However, when the workpiece is a hard and brittle material, cracks may occur inward from the machined surface. Such cracks reduce the strength of the work piece and deteriorate the physical properties. An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a cup-shaped grindstone in which cracks do not occur.

[0004]

The present inventor has found that the cracks described above occur when large chips are produced, and as shown in FIG. 2, the large chips 1 are formed on the outer peripheral portion of the cup-shaped grindstone 2. It was found that the grinding resistance F was the cause. In the figure, 3 is a workpiece and 4 is a crack. Then, the above-mentioned problems can be solved by connecting at least one of the outer peripheral surface and the inner peripheral surface and the end surface working surface with an inclined surface having a minute angle that maximizes the cut amount on the end surface working surface.

[0005]

The work is ground by a minute amount by the abrasive grains on the inclined surface. That is, in the conventional technique, the grinding resistance in the feeding direction, which was concentrated on the abrasive grains near the inner and outer circumferences, is dispersed to each abrasive grain on the inclined surface, so that the grinding resistance in the feeding direction of each abrasive grain becomes minute. Therefore, a high quality finished surface without cracks can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In addition, in the figure, (a) is an overall view showing a grinding state, and (b) is an enlarged view of a portion A of (a). ◆ 2 is a cup-shaped grindstone, which is the end 6 of the end working surface 5 and the corner 8 of the outer peripheral surface 7.
An inclined surface 9 having a minute angle is formed between and. The height of the corner portion 8 with respect to the end face work surface 5 is H, and the inclined surface 9 is
The angle made by the end face work surface 5 is θ. The operation will be described below. The cutting amount t of the grindstone 2 is smaller than the height H, and the feed speed of the workpiece 3 is f. The work piece 3 is sequentially machined from the abrasive grains on the inclined surface 9 close to the outer peripheral surface 7 by a minute amount, and finally ground to a depth of the grindstone cutting amount t. That is, that is, since the grinding resistance in the feed direction, which was concentrated on the abrasive grains near the inner and outer circumferences in the prior art, is distributed to each abrasive grain on the inclined surface, the grinding resistance in the feed direction for each abrasive grain is It becomes minute and high quality finished surface without cracks can be obtained. ◆ In addition, height H is about 0.2 to 1 mm,
It is practical to set the angle θ to 0.5 to 5 degrees. Also,
In this embodiment, the inclined surface 9 is provided on the outer peripheral surface 7 side of the cup-shaped grindstone 2.
However, it may be provided on the inner peripheral surface 10 side, or may be provided on both the outer peripheral surface 7 side and the inner peripheral surface 10 side.

[0007]

As described above, according to the present invention, the work piece is ground by a minute amount by the abrasive grains on the inclined surface,
The effect is that a high quality finished surface without cracks can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a processing state in an embodiment of the present invention.

FIG. 2 is an explanatory view showing a processing state in the related art.

[Explanation of symbols]

 2 cup-shaped grindstone 3 work piece 5 end face working surface 7 outer peripheral surface 9 inclined surface 10 inner peripheral surface

Claims (1)

[Claims] 1. A cup-shaped grindstone characterized in that at least one of an outer peripheral surface and an inner peripheral surface and an end surface working surface are connected to each other by an inclined surface having a minute angle at which the amount of cutting is maximized on the end surface working surface.