JPH0671709B2 - Super abrasive cutting stone - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a grindstone made of super-abrasive grains such as diamond and CBN (cubic boron nitride) mainly used for cutting stones, concrete and the like.

[Prior Art] FIG. 4 shows a diamond cutting grindstone together with a processed state.

As shown in the figure, the disc-shaped main body 1 is attached to a rotary shaft through a center hole 2, and a large number of chip pedestals 3 are formed on the outer peripheral surface thereof at predetermined intervals. On the pedestal 3, a diamond chip 4 having a diamond layer formed on its peripheral surface.
Is installed. The diamond tip 4 has a substantially short shape, and two parallel side surfaces are arranged parallel to the end surface of the main body 1. When the diameter of the grindstone is relatively small, the diamond tip 4 is mounted on the pedestal 3 by means such as brazing. When the diameter is increased, it is detachably attached by mechanical fitting using a dovetail groove or the like as shown in FIG.

As shown in FIG. 4, the cutting process is performed by a method in which a grindstone is rotated to cut into the work 5 by a predetermined amount. In that case, both side surfaces of the tip 4 and the end surface on the front end side in the rotation direction serve as grinding surfaces and bite into the workpiece 5. In addition, since large frictional heat is generated during grinding, it is necessary to continuously supply the grinding liquid between the grindstone and the work 5 during the cutting process to sufficiently cool the processed part.

[Problems to be Solved by the Invention] In the cutting whetstone having the above structure, the tip 4 is attached to the main body 1 by fixing the center of the tip 4 exactly to the center line between both end surfaces of the main body 1. Because is difficult
Both sides of the chip 4 are projected from both end surfaces of the main body 1 by substantially the same amount, and one side surface is aligned with a line parallel to one end surface of the main body 1. However, when the chip 4 is mounted in this manner, the chip 4 itself has a variation as a metal bond due to a general sintering method.
The other side surface has irregular irregularities. If machining is performed in this state, problems such as frequent chipping of the chip 4 and non-uniform cutting resistance causing the grindstone to incline and bite into the work will occur. For this reason, after mounting the tip, it is necessary to perform a width determining process such as truing on the side surface of the tip to make the uneven polishing surface uniform.

However, in order to form a uniform grinding surface by such a width-determining process, it is necessary to cut into the side surface of the tip that is retracted to the innermost side, so the grinding surface must be deeply ground and It takes a lot of work.

Further, in the case of a grindstone with a small grindstone diameter where the tip is directly brazed and fixed to the main body, it is possible to form a substantially uniform grind surface by the truing process because the side surface of the tip is small, but the grindstone diameter becomes large. If the area of the side surface of the insert becomes large, even if the truing tool is pressed hard,
Almost no variation in shape is corrected and a uniform grinding surface cannot be obtained.

Furthermore, as shown in FIG. 3, when the chip 4 is brazed and fixed on the support base 7 and is attached to the washer 6 which is brazed and fixed to the main body 1 in a cassette type, it is caused by brazing between the respective parts. The amount of variation between the side surfaces of the chip is further increased due to the displacement. For this reason, the cutting accuracy is significantly deteriorated, which is a serious problem in using a cassette type cutting grindstone.

SUMMARY OF THE INVENTION The main object of the present invention is to provide a superabrasive grain cutting grindstone that solves the above problems, improves the chip manufacture and the mountability to the main body, and eliminates the need for width determination after mounting. There is.

[Means for Solving the Problems] In order to solve the above problems, the present invention firstly changes the shape of the chip and further adds a new device to the mounting arrangement.

As shown in Fig. 1 (a), the tip 4 formed by metal-bonding diamond grains 4c has a stepwise width on one side such as 4a, 4a ', 4a ", and the outer side is thicker on the other side 4b. Is formed in a non-stepped manner, and the chip 4 on the disc-shaped main body 1 is formed.
As shown in FIG. 1B, the mounting of the chip is fixed by using a reference jig so that the step 4a ″ of the chip protrudes from the surface 1a of the main body by a certain amount as shown in FIG. 1B. Similarly, the step 4a ″ of the chip is brazed and fixed so as to protrude from the other end surface 1b of the main body in a similar manner. Thus, each chip has a staggered side surface projecting in a zigzag manner with respect to the center 10 of the main body, and the non-stepped surface is equal to the above constant amount or only a small variation in the chip size. It is arranged so as to project.

[Operation] As described above, since the chip has a stepped shape on only one side surface, embossing and sintering is easier than the stepped shape on both side surfaces. In addition, when brazing and fixing, it is easy to install because it is easy to attach because it is necessary to position only the stepped side surface as a reference and leave the opposite side uneven, and since the shape of both side surfaces is different, one or two You can place them in a staggered pattern without making any mistakes, even if you do not provide special markings or colors on the chips.

Needless to say, it is not necessary to perform the width-determining process as in the conventional method after the chips are fixed, and the cutting process is performed by the stepped side surface of the chip and the front end surface in the rotational direction, so that the resistance is small and the surrounding area of the cooling liquid is good.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. The same parts as those in FIG. 4 are designated by the same reference numerals.

First, as shown in Fig. 1 (a), the non-stepped side surface 4b and steps 4a, 4
A metal bond diamond tip 4 having side faces of a ′, 4a ″ is produced. The diamond grains 4c are almost absent in the portion 4a ″ and are easily brazed.

As shown in FIGS. 2 and 3, chip pedestals 3 are provided on the peripheral edge of the disk-shaped main body 1 at predetermined intervals in the circumferential direction, and washers 6 are brazed to the outer surfaces of the pedestals 3. ing. On the upper portion of the washer 6, a projection 9 having an inverted dovetail groove is formed, whose center is along the center line 10 between the both end surfaces 1a and 1b of the main body 1 and is wide at one end side and narrows toward the other end. ing.

As described with reference to FIG. 1A, the diamond tip 4 has a substantially short-sided shape, and two parallel side surfaces 4a and 4b are formed in multiple steps and non-steps. A support base 7 is brazed and fixed to the lower portion of the chip 4 with the side surfaces thereof aligned in parallel. On the lower surface of the support base 7, a dovetail groove 8 that fits the projection 9 on the washer 6 is formed. The chip 4 is pushed in the direction in which the dovetail groove 8 is inserted into the projection 9 to widen the groove width. By inserting, both slopes of the projection 9 and the inner surface of the dovetail groove 8 are closely fixed and fixed. In this state, the center of the support base 7 is the center line 10 of the main body 1.
Positioned on top. In contrast to the above, the washer 6 may be provided with a dovetail groove, the lower surface of the support base 7 may be provided with a projection, and the washer 6 may be attached by another connecting structure.

The chips 4 are fixed to the support base 7 not by making their centers coincide with each other, but by shifting the center positions of the chips 4 in the width direction.

This is because when the chip 4 is fixed to the upper surface of the support base 7, the stepped side surface a of the chip 4 is set to the minimum width dimension (4
The value obtained by subtracting the width dimension of the support base 7 from a ″) is divided into two equal parts, and the amount obtained by adding the amount larger than the manufacturing tolerance of the chip 4 to the two equal parts is projected from one side surface of the support base 7. That is, only one side surface of the chip 4 is brazed and fixed to the supporting base 7. In this embodiment, the entire chip 4 mounted on the main body 1 is divided into halves and they are attached to each other. It is attached to the support base 7 with the stepwise side faces facing in the opposite direction as a reference, and the phase with respect to the support base 7 is shifted in the opposite direction. When this chip 4 is attached along the circumference of the main body 1, FIG. As shown in, every other side surface of the chip 1 protruding in the same direction is staggered and arranged in a staggered manner with respect to the center line 10 of the main body 1. In this manner, with the chips 4 arranged and fixed, Tip 4 protruding in the same direction
The step-like side surface 4a of the chip 4 always protrudes outward from the side surface 4b of the chip 4 projecting to the opposite side, and the chip side surfaces 4a projecting in the same direction are evenly aligned on a line parallel to the center line 10. Are arranged.

The amount of displacement of the chip 4 from the center line 10 is set to a size not less than the manufacturing tolerance of the chip 4 as described above, but if it is made too large, the load applied to the side surface of the chip during processing becomes excessive. Too much, causing chipping. For this reason, it is desirable to set a value before and after this shift amount with 0.1 mm in one direction as a reference from the center line 10.

When cutting with a whetstone constructed in this way,
One side of the processed groove has chips 4 arranged every other piece.
Are processed by the stepped side surface, and the remaining non-stepped side surfaces do not participate in the processing.

Therefore, the lateral frictional resistance applied to the grindstone is reduced to almost half compared with the case where all the side surfaces of the tip are involved in the machining, and the vibration of the grindstone during cutting is reduced to enable stable machining. It Further, since the side surfaces of the chips protruding in the same direction are uniformly positioned on a line parallel to the center line 10 of the main body 1, a uniform processing load is applied to the side surfaces of the chips during processing, Inadvertent chipping of No. 4 is prevented, and the chip side surface is evenly worn.

The side surface of the chip 4 on the retracting side, that is, the side not involved in the processing is formed in a non-stepped manner, and the shape is different from the side involved in the processing, and it does not make a mistake even if no marking is applied at the time of mounting and fixing.

In this embodiment, one side that is involved in processing and the other side that is not processed are arranged in a so-called zigzag pattern, but a plurality of chips are grouped, but the phases of the chips are shifted by irregular arrangement. You may do it.

[Effects] As described above, according to the present invention, the side surface of the superabrasive grain tip 2 is made asymmetric between stepwise and ratio stepwise, and only a certain amount of stepwise side surface is projected as a reference surface from one end surface of the tool body. Since it is attached by mounting it, the time required to position the chip is shortened compared to the case where both sides of the chip are projected by the same size with respect to the center of the support base, and the manufacturing work is much easier. Since the side surface of the tip protruding in the same direction with the attached to forms a uniform grinding surface,
There is no need to perform width-determining processing such as truing, and it is possible to save extra work on the work.

Furthermore, in addition to facilitating the manufacturing of chips, the side surface of the groove to be machined is formed by only a part of the chips protruding in the same direction, so all chips are machined compared to conventional cutting wheels that were involved in grinding. The frictional resistance in the inside can be greatly reduced, the lateral deflection of the grindstone is suppressed, the processing is stable, and the water flow to the processing surface is improved, and the workability in use is improved.

[Brief description of drawings]

1A and 1B are a perspective view of a diamond tip according to an embodiment of the present invention and a plan view showing a tip mounted state of a cutting grindstone, FIG. 2 is a front view of the same, and FIG. 3 shows a tip mounting structure. FIG. 4 is a perspective view showing a conventional diamond cutting grindstone. 1 ... Disc-shaped body, 3 ... Tip pedestal, 4 ... Diamond tip, 4a, 4a ', 4b "... Stepped side, 4b ... Non-stepped side.

Claims (5)

[Claims] 1. A superabrasive grain tip, which is arranged on the outer peripheral surface of a disk-shaped main body attached to a rotary shaft and has two substantially parallel side surfaces arranged in parallel to the end surface of the main body, on the circumference. In the superabrasive grain cutting whetstone attached at a predetermined interval along the width of the tip, the outermost side of one side surface is thick and the innermost side is thin, and the other side surface is formed non-stepwise. As for the attachment to the peripheral surface of the main body, the stepped side surface protrudes from the main body end surface by a constant value on the innermost side, and the non-stepped side surface protrudes from the main body end surface by the same amount as the above constant value but slightly smaller than that. A super-abrasive material characterized in that it is arranged so as to be located on a line parallel to the end face of the main body, and that the stepped side surfaces of each of the chips face one side surface of the main body at alternate intervals. Grain cutting whetstone. 2. The grindstone according to claim 1, wherein the non-stepped side surface of the superabrasive grain tip is formed by a flat surface. 3. The grindstone according to claim 1 or 2, wherein the superabrasive grain tip is fixed to a disc-shaped body. 4. The grindstone according to claim 1 or 2, wherein the superabrasive grain tip is detachably attached to the disc-shaped body. 5. The superabrasive grain tip has a support base on which a dovetail groove or a projection is formed, and the disc-shaped body has a dovetail groove or a projection or a dovetail groove that can be fitted into the dovetail groove. 5. The grindstone according to claim 4, wherein the dovetail groove or projection of the base and the projection or dovetail groove of the main body are engaged with each other so that the tip is detachably fixed to the main body.