JPS60180775A - Cutting grind stone - Google Patents

Abstract

PURPOSE:To increase the life of a grind stone by providing a number of holes, at a certain rate of perforation, on the whole surface, or a part near the outer periphery, of the core metal of a grind stone. CONSTITUTION:A number of fine holes 2 are uniformly provided, at a perforation rate of 10-50%, on the whole surface, or a part near the outer periphery, of a core metal of a diamond grind stone 1 with a thickness of 0.5mm. or less. Thus, by providing fine holes 2, sufficient grinding fluid can be fed over the whole grinding surface of the grind stone 1, rise in temperature of the grinding surface can be reduced, and the life of the grind stone 1 can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in diamond grindstones used for cutting difficult-to-cut materials such as high-density ferrite and ceramics.

Conventionally, the grindstone used to cut difficult-to-cut materials such as hard-to-cut ferrite and ceramics is a disk-shaped grindstone, as shown in Figure 1, made of fine diamond particles hardened with a metal or resin binder. .

However, when cutting a thick workpiece with this disk-shaped diamond grinding wheel, the temperature of the grinding surface becomes high because the grinding fluid does not circulate sufficiently over the contact surface between the grinding wheel and the workpiece, that is, the entire grinding surface. However, there were drawbacks such as severe deterioration of the abrasive grains, resulting in a decrease in sharpness, increased wear of the grindstone, poor cutting accuracy, and shortened lifespan.

The present invention aims to improve the drawbacks of the above-mentioned prior art and provide a cutting diamond grindstone that can extend the life of the grindstone.

The percentage characteristics of the present invention are obtained by uniformly drilling a large number of holes on the entire surface of the core metal of the cutting wheel or near the outer periphery of the core metal so that the perforation rate is 10 to 50%. be. Here, the perforation rate is the ratio of the total area of the drilled holes to the area of the core metal. By making the cutting diamond grindstone in this way, a sufficient amount of grinding liquid is supplied to the entire surface to be ground during processing, thereby preventing deterioration of the abrasive grains and extending the life of the grindstone.

The reason why the perforation rate was limited to 10-50% is as follows.

If it is less than 10%, deterioration of the grinding wheel cannot be satisfactorily prevented due to the opacity of the supply of grinding fluid to the grinding surface during machining, and if it is more than 50%, the rigidity of the grinding wheel is weakened.

The present invention will be explained in detail below. Outer diameter 10-2 Inner diameter 40+
+IIf+ +The second diamond grindstone with a thickness of 0.5m
As shown in the figure, within the range of 80 to 10-diameter K O, 4m
Drill holes with a diameter of [) and 5 mφ at intervals of (the drilling rate is 25%)
corresponds to )did. This grindstone was attached to the cutting machine shown in FIG. 3, and cutting was carried out at a grindstone rotation speed of 600 Or, p, m', and a cutting speed of 40''/min, with grinding fluid supplied from the side of the grindstone.

The workpiece is 30mm long x 25mm wide x 10111mm thick.
No. 11 high-density Mn-Zn ferrite was cut in the thickness direction.

Even when cutting workpieces as thick as 10m,
Since the grinding fluid is sufficiently supplied over the entire surface of the grinding surface, the temperature rise on the grinding surface is small, and the life of the grinding wheel can be improved by 55% compared to when a conventional grindstone is used.

Figure 4 shows the diameter of the perforation of the core metal in the above embodiment.
This is an example of a whetstone in which holes with a diameter of d: 0.5 mm are uniformly drilled at the tip of a 100-piece core metal at intervals of t = 0.5 mm (corresponding to a drilling rate of 11 or more). However, even when this grindstone was used for cutting under the same conditions as in the above embodiment, the life of the grindstone was improved by 30 times compared to the life of the conventional grindstone.

As detailed above, the present invention has the effect of significantly improving the life of the grindstone.

[Brief explanation of the drawing]

FIG. 1 shows a conventional cutting magnet, FIG. 2 shows a cutting grindstone according to the present invention, FIG. 3 shows a processed diagram, and FIG. 4 shows an embodiment of the present invention. 1: Cutting wheel, 2: i-hole, 3: main shaft, 4: grinding fluid nozzle, 5: workpiece 1st mouth 2nd 30th 4th mouth ν

Claims (1)

[Claims] A diamond grinding wheel π with a thickness of 0.5 m or less is characterized in that a large number of holes are bored so that the pressure near the entire surface of the core metal of the grinding wheel or the outer periphery of the core metal and the perforation rate are 10 to 50%. Cutting wheel. −