JPH07328930A - Grinding wheel for rotary surface grinding machine - Google Patents

Abstract

PURPOSE:To provide a grinding wheel for a rotary surface grinding machine capable of preventing the clogging at the outer peripheral section. CONSTITUTION:This grinding wheel for a rotary surface grinding machine has a grinding surface gradually decreased in the peripheral length toward the center of a circular holder and provided with a recess 7 at the center of the circular arc-like outer periphery 1. A grinding liquid is engulfed into the recess 7, and the clogging of chips is prevented. The prinding area is decreased by the recess 7, and it is effective in enhancing the cutting quality.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a grindstone for a rotary surface grinder.

[0002]

2. Description of the Related Art As a conventional grindstone for a rotary surface grinder, for example, one disclosed in Japanese Patent Publication No. 62-34512 is known. The grindstone 10 for a rotary surface grinding machine described in this publication has a substantially isosceles triangular shape with an apex-corresponding portion being an obtuse angle as shown in FIG. 4, and is provided on the outer periphery of the annular holder 11 as shown in FIG. Used at intervals.

This shape has an advantage that the grinding liquid ejected from the center portion easily enters the grinding surface, as compared with the case where the grinding surface has a rectangular shape. However, this grindstone for a rotary surface grinder 10 has a circumferential length of the outer peripheral portion of the grinding surface larger than that of the inner peripheral portion, and since the grinding liquid does not easily reach the outer peripheral portion of the grinding surface, the cutting chips are formed in the outer peripheral portion. Had a problem that it was easily clogged. Therefore, there is a problem that the grinding ratio is lowered, grinding burn is likely to occur, and the flatness of the object to be ground is also lowered.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and prevents clogging at the outer peripheral portion, thereby reducing the above-mentioned various troubles. It was made to provide a whetstone.

[0005]

A grindstone for a rotary surface grinding machine of the present invention made to solve the above problems,
A grindstone for a rotary surface grinder mounted on the outer circumference of an annular holder at equal intervals, the grinding surface of which has a gradually decreasing circumferential length toward the center of the annular holder and which has an arc-shaped outer circumference. It is characterized in that a concave portion is provided in the center of the surface.

[0006]

In the grindstone for a rotary surface grinding machine according to the present invention, since a concave portion is provided on the outer peripheral surface where clogging is likely to occur, the clogging of the cutting chips is unlikely to occur even in the outer peripheral portion when the grinding liquid is drawn into the concave portion. Further, since the concave portion is provided on the outer peripheral surface, there is an advantage that the sectional area of the grindstone is reduced, the grinding resistance is reduced, and the sharpness is improved.

[0007]

The present invention will be described in more detail below with reference to the embodiments shown in the drawings. FIG. 1 shows the shape of the grinding surface of a grindstone for a rotary surface grinding machine according to a first embodiment of the present invention. An outer peripheral surface 1 is an arc surface, and as shown in FIG. It has the same curvature as the inner surface of the metal fitting 3. In this embodiment, the distance between both ends of the outer peripheral surface 1 is 80 mm.

First planes 4 and 4 of about 10 mm are formed at both ends of the outer peripheral surface 1, and second planes 5 and 5 having an obtuse angle α are formed inside thereof. The second planes 5 and 5 are connected by the inner surface 6. The inner surface 6 of the embodiment is a flat surface having a length of about 15 mm, but the outer peripheral surface 1
It may be an arc surface concentric with. In this way, the shape of the grinding surface is configured such that the length in the circumferential direction gradually decreases toward the center of the annular holder 2.

An arcuate recess 7 is provided in the center of the outer peripheral surface 1. Although the radius of curvature of the concave portion 7 in this embodiment is 40 mm and the distance between both ends of the concave portion 7 is 47 mm, the depth of the concave portion 7 may be further deeper and is not limited to the illustrated shape. Not a thing. The material of the grindstone of the embodiment is a mixture of 36 mesh PA abrasive particles and WA abrasive particles. Such a grindstone for a rotary surface grinder is used by being attached to an annular holder 2 in sets of 12 at equal intervals as shown in FIG.

FIG. 3 shows the shape of the grinding surface of a grindstone for a rotary surface grinding machine according to a second embodiment of the present invention. In this embodiment, the arcuate surface 8 is provided between both ends of the arcuate outer peripheral surface 1.
The outer peripheral surface 1 is formed with an arc-shaped concave portion 7 that is deeper than that of the first embodiment.

In order to confirm the effect of the grindstone for the rotary surface grinding machine of the present invention, the following experiment was conducted. First, as shown in FIG. 2, the grindstone of the first embodiment is attached to an annular holder 2 and set on a grindstone head of a rotary table type rotary surface grinding machine of a vertical shaft, and a die steel (SKD) of 450 × 450 mm in size. 11, the surface of HRC 55) was ground. The table rotation speed at this time was 15 rotations per minute, and the rotation speed of the grindstone head was 1340 rotations per minute. The grinding fluid was sprayed from the center of the grindstone head at a rate of 20 liters per minute onto the grinding surface for grinding.
The conventional grindstone shown in FIG. 4 was also ground under the same conditions. The results are shown in Table 1. As shown in Table 1, by using the grindstone for the rotary surface grinding machine of the present invention, clogging is not caused, and moreover, flatness and many items are more than those in the case of using the conventional grindstone. An excellent effect can be obtained.

[0012]

[Table 1]

[0013]

As described above, the grindstone for a rotary surface grinding machine according to the present invention has a shape in which a concave portion is provided in the center of an arc-shaped outer peripheral surface which has the longest circumferential length and is apt to cause clogging. As a result, the grinding liquid is drawn into the recesses to prevent the chips from being clogged. Further, since the grinding area is reduced by this concave portion, the grinding resistance is also reduced and the sharpness is improved. As a result, the flatness of the surface to be ground is improved, grinding burn is reduced, and the finished surface roughness is improved. Further, the grinding ratio is also improved, and the efficiency of the grinding work can be improved as compared with the conventional product.

[Brief description of drawings]

FIG. 1 is a plan view of a grindstone for a rotary surface grinding machine according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a state in which a grindstone for a rotary surface grinder of the first embodiment is attached to an annular holder.

FIG. 3 is a plan view of a grindstone for a rotary surface grinding machine according to a second embodiment of the present invention.

FIG. 4 is a plan view of a conventional grindstone for a rotary surface grinder.

FIG. 5 is a plan view showing a state in which a conventional grindstone for a rotary surface grinder is attached to an annular holder.

[Explanation of symbols]

 1 Outer peripheral surface 2 Annular holder 3 Mounting bracket 4 First plane 5 Second plane 6 Inner surface 7 Recess 10 Conventional grinding wheel for rotary surface grinder 11 Annular holder

Claims (1)

[Claims] 1. A grindstone for a rotary surface grinder, which is mounted on the outer periphery of an annular holder at equal intervals, wherein the grinding surface has a shape in which the circumferential length gradually decreases toward the center of the annular holder, Also, a grindstone for a rotary surface grinding machine, characterized in that a concave portion is provided at the center of an arcuate outer peripheral surface.