JPS594260B2 - Double-headed diamond grinding wheel for surface grinding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a double-head surface grinder to grind a hard and brittle material workpiece such as iron or ceramics by through-feeding the centers of two opposing grinding wheels. This invention relates to the structure of a double-headed diamond grinding wheel for surface grinding.

Conventionally, when grinding hard and brittle materials such as ferrite or ceramics with a double-head surface grinder, the grinding wheel has multiple concentric circles on the surface of the grinding wheel base 0, as shown in Figures 1 and 2. grooves are carved in the radial direction at a slight interval dV, and annular diamond sintered blocks A and Bf with a width that exactly fits into these grooves are fitted, and the fitting part at the bottom of the block is cut into the grooves. Fix it with adhesive or the like, and finish it so that the inner flat upper surface a2 of the diamond layer a of the outer diamond sintered block A and the upper surface of the diamond layer of the inner diamond sintered block B are on the same horizontal plane. , and has a grinding wheel surface with a taper of 3 to f in a portion a1 radially 10 to 20 nm from the outer edge of the outer periphery of the upper surface of the diamond layer a to improve feeding of the workpiece. Ta.

This block consists of diamond layers a and b formed by sintering diamond abrasive grains with a resin bond or metal bond. A lower layer g and a base metal f are provided at the bottom of the diamond sintered blocks A and B. The lower part of the base metal f is fitted into the groove 1 on the surface of the grindstone base 0 and fixed by adhesive or the like.

In such a configuration, the radial distance d between the grooves
serves as a circumferential passage for the grinding fluid, and straight or curved grooves C with a depth equal to the thickness of the diamond layers a and b are also provided in the radial direction of the diamond layers a and b to allow the grinding fluid to flow in the radial direction. It is used as a passageway.

h is the center hole of the grinding fluid supply hardware.

In these conventional double-headed diamond grinding wheels for surface grinding, as the material is ground by through-feeding the centers of the two opposing grinding wheels, the upper surface of the diamond layer on the grinding wheel surface gradually wears out. However, as shown by the broken line in Fig. 6, the edge 24 of the outer periphery of the grinding wheel surface decreases as the wear progresses.
It gradually increases from 1.0 to 1.2 FMm, reaching a maximum near the intersection 25-1 of the tapered surface 25 on the outer periphery and the horizontal portion 26 on the upper surface of the inner diamond layer, and then gradually decreases as it moves inward. For example, 0.35 to 0.40 to 6011!21 from the edge of the outer periphery of the grinding wheel surface.
75 mm, and furthermore, at a location 27 that is about 70 mm away from the edge of the outer periphery of the grinding wheel surface, it has a constant minimum value of 04 mw or less.

If the maximum amount of wear of the diamond layer on the grinding wheel surface exceeds the limit of, for example, about 1.25 mm, the grinding efficiency of the grinding wheel will drop significantly and the accuracy of material processing will also deteriorate, so the grinding wheel will need to be repaired by the grinding wheel manufacturer.

During this repair, each top surface of the diamond layer is the top surface 24-25-26- of the newly manufactured diamond layer, with reference to the point 25-1 on the top surface of the diamond layer that is worn the most on the grinding wheel surface.
27, the top surface of each diamond layer is G,
C. Since the finishing is done by grinding with a whetstone, etc., the amount of grinding is large, which requires a large number of man-hours to repair, which not only increases the repair cost, but also requires the diamond layer of the diamond sintered block to be made thick. As a result, a large amount of expensive diamond abrasive grains are required, and the manufacturing cost of the whetstone increases.

The present invention eliminates the above-mentioned drawbacks, minimizes the amount of grinding during repair after use, making it extremely easy and quick, and also makes the diamond layer thinner when newly manufactured, making the grinding wheel cost extremely low. The purpose of the present invention is to provide a double-headed diamond grinding wheel for surface grinding.

The annular diamond sintered block of the double-headed diamond grinding wheel for surface grinding according to the present invention has a diamond sintered block on the outer periphery where wear of the diamond layer on the grinding wheel surface becomes noticeable during use, and grooves on the outer periphery of the surface of the grinding wheel base. The block base metal is fitted into the block base metal and fixed with adhesive etc., but the alloy bottom surface of the multiple diamond sintered blocks on the inner circumference side, where the wear of the diamond layer on the grinding wheel surface during use is a certain minimum value. After the diamond sintered block alloy is fitted into the groove of the whetstone base, several bolts are passed through the whetstone base from the back side of the whetstone base, and a spacer is inserted if necessary. The diamond sintered block is tightened by screwing into the screw hole of the sintered block base metal.

Since the double-headed diamond grinding wheel for surface grinding of the present invention has the above-described structure, when repairing the diamond layer on the grinding wheel surface due to increased wear during use, first repair the diamond layer of the diamond sintered block on the outer periphery. The upper surface of the diamond layer is finished by grinding with a G, C, grindstone, etc. so that it is parallel to the surface of the newly manufactured grindstone, based on the point where the maximum wear has appeared.

Next, measure the height at which the top surface of the diamond layer of the inner diamond sintered block is in the same horizontal plane as the top surface of one diamond layer after repair of the outer diamond sintered block. For tightening, loosen and remove the bolts, and process the alloy bottom surface or spacer of each diamond sintered block by grinding or cutting the amount necessary to make the top surface of the diamond layer on the same horizontal plane based on the above measurement value, and then The repair of the grinding wheel surface can be completed by simply reassembling the grinding wheel and slightly shaping the upper surface of the diamond layer on the grinding wheel surface, so the number of man-hours for repair is significantly reduced, and the number of days required for repair is also extremely shortened.

In addition, as can be seen from the above, the diamond sintered block on the inner peripheral side, where the wear of the diamond layer on the grinding wheel surface during use is a certain minimum value, is assembled to the grinding wheel base directly or with bolts through a spacer. To repair the diamond layer on the grinding wheel surface, it is sufficient to process the bottom surface of the alloy by grinding or cutting, or to reduce the thickness of the spacer by grinding or cutting. The amount to be removed is extremely small, and therefore the diamond layer of the inner diamond sintered block can be made thinner when a new grinding wheel is manufactured, so the amount of expensive diamond abrasive grains used can be greatly reduced.

Preferred embodiments of the present invention will be described below with reference to the drawings.

In the double-headed surface grinding diamond grinding wheel using the annular diamond sintered block of the present invention shown in FIGS. 3 and 4, the annular diamond sintered blocks 1 and 2 formed concentrically are diamond layer ia, 2
a. Consisting of block base metals 5, 8 and lower pressing layers 6, 9 located between these, the base metals 5, 8 are fitted into grooves on the surface of the whetstone base 7 at intervals, respectively, to form the whetstone base 7.
Fixed to.

In the present invention, the method of fixing is different from the conventional one.

That is, in the present invention, the annular diamond sintered block 1 on the outer periphery, which is composed of the diamond layer 1a, the lower pressing layer 6, and the block base metal 5, which undergoes significant wear during use, is attached to the grindstone base 7 as in the conventional one. The block base metal 5 is fitted into the annular groove on the outer periphery of the surface, and the sintered block 1 is fixed with adhesive or the like. Layer 9 and block base metal 8
The diamond sintered block 2 made of
1 Then fit the block base metal 8 into each, and pass the bolt 12 through the grindstone base 7 from the hole 7a on the back side of the grindstone base γ, or connect the grindstone base 7 and the spacer 11.
The diamond sintered block 2 is tightened by screwing into a tapped hole formed on the bottom of the block base metal 8 through the hole.

The inner flat upper surface 1-2 of the diamond layer 1a of the diamond sintered block 1 and the upper surface 2-1 of the diamond layer 2a of the diamond sintered block 2 are finished to be the same horizontal plane, and the diamond layer 1a on the outer periphery is Top surface 1 in the range 10-20 mm radially inward from the outer edge
-1 has a taper of 3 to 3 to make it easier to feed the material to be processed.

The base 7 is provided with a center hole 10 for the grinding fluid supply hardware.

The annular wall that separates the annular grooves of the grinding wheel base 7 into which the outer and inner diamond sintered blocks 1 and 2 are fitted is made to a depth that allows the base metal 5°8 of the sintered block to penetrate to the extent of a monk. Because there is a diamond layer of sintered block,
A deep groove 4 in the circumferential direction is formed between the subassemblies of the lower layer and a part of the base metal, and serves as a passage for the grinding fluid.

In addition, diamond layers 1a and 2a are formed in the radial direction of the grinding wheel surface.
A radial grinding fluid passage groove 3 having a depth corresponding to the thickness of the grinding fluid is provided.

The radial grooves 3 of the diamond layers 1a, 2a may be curved as shown in FIG.

5 is the same as that of FIG. 4 except that the groove 3' is curved, and corresponding members are distinguished by the same reference numerals with dashes.

Maximum wear point 25-2 of the diamond layer of the diamond sintered block when repairing the double-headed surface grinding diamond grinding wheel of the present invention configured as described above after use (Fig. 6)
The upper surfaces 1-1 and 1-2 of the diamond layer 1a, which include the diamond layer 1a where wear is noticeable, are finished so that they are parallel to the upper surface 24-25-26 of the diamond layer of the newly manufactured whetstone surface using the 25-1 standard. For other diamond sintered blocks 2, loosen the bolts 12, remove the block, process the bottom surface of the base metal 8 of the block, or process the spacer 11, and reassemble the block with the bolts 12. The upper surfaces of these diamond layers can be easily finished to be flush with the flat upper surface 1-2 of the diamond layer 1a of the diamond sintered block 1 on the outer periphery after the above-mentioned repair has been completed.

As is clear from the above, in the double-headed diamond grinding wheel for surface grinding of the present invention, the wear of the diamond layer on the grinding wheel surface becomes noticeable during use. The outer diamond sintered block containing the layer is fixed directly to the annular groove on the surface of the grinding wheel base 7 in the conventional manner, and the inner diamond sintered block, where wear of the diamond layer that occurs during use is minimal, is attached to the grinding wheel. It can be fitted directly into the annular groove inside the surface of the base 7 or via the spacer 11, and assembled from the back side of the whetstone base 7 with bolts 12. It is only necessary to repair the diamond layer of the diamond sintered block using a G, C, grindstone, etc., and then process the block base metal or spacer for the remaining inner diamond sintered block, and the amount of grinding to correct the diamond layer is small. As a result, the number of repair man-hours can be drastically reduced, and repair costs can be significantly reduced, as well as the number of days required for repair.

Furthermore, in the grinding wheel of the present invention, when newly manufactured, the diamond layer of the inner diamond sintered block can be made thinner, so that the wear of the diamond layer that occurs during use is minimal, so expensive diamond abrasive grains can be used. This has the effect of reducing the amount and significantly reducing the manufacturing cost of the grindstone.

The diamond grindstone of the present invention grinds hard and brittle materials such as ferrite or ceramics using a double-headed surface grinder.
Since the center of two opposing double-headed surface grinding wheels is through-feeded to finish grinding both sides of the workpiece at once, the upper surface of the diamond layer on the outer periphery of the grinding wheels shows significant wear during grinding. Since the grinding resistance exerted by the workpiece is large, the diamond sintered block on the outer periphery of the grinding wheel surface is attached to the diamond sintered block and the grinding wheel by fitting the alloy into the groove on the surface of the grinding wheel base and fixing it with adhesive or other means. It is integrated with the base surface and made solid to ensure grinding performance and grinding accuracy of the workpiece.

However, on the inside of the grinding wheel surface, the wear on the top surface of the diamond layer is reduced, and the fine resistance received from the workpiece is also reduced. Therefore, the diamond sintered block is made into a separate type, and the bolts can be tightened from the back side of the grinding wheel base. The configuration in which the diamond sintered block is tightly fixed by passing through the base and spacer and screwing into the screw hole on the alloy bottom surface of the block can ensure sufficient grinding performance and grinding accuracy of the workpiece.

In other words, the alloy of the diamond sintered block is a one-piece ring-shaped alloy, and the area of the bottom surface of the alloy and the spacer is sufficiently large, and the diamond sintered block can be tightened with a large force using bolts, so the sintered block is firmly attached. Therefore, it maintains sufficient rigidity against the detailed resistance received from the workpiece during grinding and does not cause plastic deformation, making it possible to perform heavy grinding on the workpiece and maintain sufficient grinding accuracy. Can be held high.

[Brief explanation of the drawing]

Figure 1 shows a conventional method in which a grinding wheel surface is formed using multiple concentric annular diamond sintered blocks with a relatively large width and a resin-bonded or metal-bonded diamond layer, and a straight line is formed in the radial direction of the grinding wheel surface. FIG. 2 is a cross-sectional view of the grinding wheel shown in FIG. 1, and FIG. 3 is a plan view of a diamond grinding wheel for double-headed surface grinding with grooves in the form of shapes, FIG. 3 is a cross-sectional view of the grinding wheel shown in FIG. 1, and FIG. Figure 4 is the 3rd floor plan of the
Fig. 5 is a plan view of the grinding wheel according to the present invention with curved grooves in the radial direction on the grinding wheel surface, and Fig. 6 is a cross-sectional view of the grinding wheel of the present invention. A diagram showing the state of wear occurring on the upper surface of the diamond layer on the grinding wheel surface of a double-headed diamond grinding wheel for surface grinding. 1...Sintered block having a diamond layer 1a on the outer periphery of resin bond or metal bond with a relatively large width according to the present invention, 1-1...Diamond layer 1 as described above
1-2: The inner horizontal surface of the upper surface of the diamond layer 1a, 5: The block base metal of the diamond sintered block 1, 6: The upper and lower pressing layers, 2 . . . A sintered block having a resin-bonded or metal-bonded diamond layer 2a of a relatively large width according to the present invention, 3. . . radial straight grooves in the diamond layers 1a, 2a. 4... Circumferential groove on the grinding wheel surface, 7... Grinding wheel base, 8... Block base metal of the diamond sintered block 2, 9... Lower pressing layer of the diamond sintered block 2,
10... Center hole of central hardware for supplying grinding fluid on grinding wheel base, 11... Spacer, 12... Bolt for tightening.

Claims (1)

[Claims] 1. A grinding wheel base that is disc-shaped and has multiple relatively wide annular grooves on its surface centered around a hole at the center of rotation, with slight intervals between each groove, and a diamond base. A plurality of annular diamond sintered blocks are formed of a diamond layer, a pressing layer, and an alloy in which abrasive grains are sintered by resin bonding or metal bonding, and the alloy is formed so as to fit into the grooves of the grinding wheel base. A grindstone is constructed by the inside of the diamond sintered block,
A diamond sintered block, which is located on the outer periphery of the grinding wheel surface and has a diamond layer with a tapered outer edge and a flat inner surface, allows the alloy to be inserted into and removed from the annular groove of the grinding wheel base. The diamond sintered block on the inner peripheral side of the diamond sintered block on the outer peripheral part has a flat diamond layer surface, a plurality of screw holes are provided on the bottom surface of the alloy, and It can be inserted into the annular groove of the whetstone base directly or through a spacer, and can be freely attached to and removed from the whetstone base by passing a bolt through the whetstone base from the surface of the whetstone base, or by passing through the whetstone base and spacer and screwing into the threaded hole on the bottom of the alloy. The inner horizontal portion of the diamond layer surface of the outer peripheral diamond sintered block and the diamond layer surface of the inner peripheral diamond sintered block are configured to be the same horizontal plane, and the diamond layer surface of the inner peripheral diamond sintered block is By adjusting the thickness of the diamond layer of the sintered block by cutting the alloy bottom surface of the sintered block or cutting the spacer, the surface of the diamond layer of the sintered block is approximately equal to the flat surface of the inner part of the diamond sintered block on the outer periphery after wear repair. A double-headed diamond grinding wheel for surface grinding that can be adjusted to the same surface.