JPH0722896B2 - Super abrasive grain rotating blade - Google Patents

Description

TECHNICAL FIELD The present invention relates to a superabrasive rotary blade of diamond, CBN (cubic boron nitride) or the like, which is mainly used for cutting stones, concrete and the like.

(Prior Art and Problem to be Solved) FIG. 5 shows a diamond rotary blade in a processed state.

As shown in the figure, the disk-shaped substrate 1 can be attached to the rotary shaft through the 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 the upper layer is attached.

Both side surfaces of the chip 4 are arranged parallel to the rotation direction of the end face of the base body, and generally, when the blade diameter is small, it is fixed to the pedestal 3 by brazing or the like, and when the diameter dimension becomes large, a dovetail groove or the like is used. There are also those that can be removably attached by a mechanical fit.

For grinding, rotate the blade as shown
It is done by cutting into a certain amount.

In that case, both side surfaces of the tip 4 and the front end surface in the blade rotation direction serve as grinding surfaces and bite into the work piece, but a large amount of frictional heat is generated during grinding, so that the grinding liquid is left between the blade and the work piece. Must be continuously supplied to sufficiently cool the processed part.

Conventionally, there are the following types of rotary blades having such a structure.

First, as shown in FIG. 3 (a), two kinds of chips, for example, a chip 9'which is formed in a two-step shape like the chip 9 in which both side surfaces of the chip are formed in a symmetrical three-step shape, have three steps, for example, three steps. Chip 9
2 to 2, the two-stage chip 9'is fixed at a predetermined interval on the outer peripheral end face of the base body at a ratio of 1.

By the way, the three-stage tip 9 reduces the side resistance of the tip at the time of grinding and enables smooth grinding, but wear progresses from the upper layer of the tip, and as shown in FIG. When the contact area becomes smaller, streaky marks are left on the cut surface of the work material, and when uneven wear occurs as shown in Fig. 4 (b), the blade shakes and the cut surface Becomes a meandering state.

In order to make up for the drawbacks of the three-stage chip, the two-stage chips are arranged at a constant ratio between the three-stage chips. In this case, the chips are three-stage type and two-stage type.
It has been a problem that it is necessary to prepare a type, which is troublesome in manufacturing a chip and inconvenient in chip replacement.

Second, as shown in FIG. 3B, chips having only one side surface stepwise and the other end surface non-stepwise are arranged alternately or at arbitrary chip intervals on the outer peripheral surface of the substrate. (Japanese Patent Application Laid-Open No. 62-277270, etc.).

In this structure, the chips are fixed to the end face of the substrate only by the stepwise side surface, and the non-stepwise side is left to the variation of the chips. Since it is performed by the stepped side surface and the front end surface in the blade rotation direction arranged on the blade, the stepped side surface wears quickly, and both sides become non-stepped before the end of the useful life of the chip, resulting in high cutting resistance. It was.

Furthermore, the problem that the stripe-shaped marks remain on the cut surface due to wear of the chip and a uniform cut surface cannot be obtained has not been solved.

(Means for Solving the Problem) The present invention provides a rotating blade in which the shape of the tip is newly changed to solve the above-mentioned problems and the mounting arrangement on the base is devised.

First, regarding the shape of the chip, both side surfaces of the chip are configured stepwise as shown in FIGS. 1 and 2 (a) and (c). Is the number of steps different between one side surface and the other side surface? Alternatively, as shown in FIG. 2 (B), even if the number of steps on both sides is the same, the step configuration differs in the height direction of the chip, which is a left-right asymmetric type. This chip is mounted on the outer peripheral end face of the base body alternately as shown in FIG. 1 or inverted between arbitrary chips.

(Function) As described above, both side surfaces of the tip are stepped from the upper end surface in a stepped manner to form a side surface with a corner formed. Moreover, since it is a left-right asymmetric type, each tip is inverted and mounted to rotate the blade. , Between the corners of the chip and / or each corner of the chip mounted upside down.

When grinding is performed in this state, one side surface of the processing groove is processed by the chip upper surface most protruding to one side of the base end surface, and the stepped side surface of the chip sequentially protruding according to the wear of the chip is involved in the processing. Become.

(Embodiment) FIG. 2 (a) shows an embodiment of the present invention in which one side surface of the chip has two steps and the other side surface has three steps. It shows an overlapping state.

The tip is a metal-bonded diamond tip whose upper end surface is slightly curved in the lengthwise direction and whose both side surfaces are parallel to each other, and whose lower end surface width is larger than the thickness of the substrate. Grinding is also possible on both lower side surfaces. However, there are few diamond abrasive grains 10 in the lowermost layer of the chip, and brazing to the substrate is easy (see FIG. 1).

Here, the step structure of the chip will be described. As shown in the drawing, the dimension from the chip center line 8 to the upper surface 4a on the third step side is d ₁ in the width direction of the chip, and the upper surface 4 on the second step side from the same 8 is shown.
The dimension up to b is d ₂ , the dimension from the same 8 to the middle side surface 4a ′ of the third step is d ₃ , and the dimension from the same 8 to the lower side surface 4a ″ of the same side and the lower step side surface 4b ′ is d ₄ . In this case, these are in the relationship of d ₁ > d ₂ > d ₃ > d _4. Also, in the chip height direction, the dimension of the upper side surface 4a in the height direction is the same as h ₁ and the upper step side surface 4b has the same dimension. The dimension in the direction
h ₂ , the dimension from the top of the chip to the bottom of the medial side 4a ′ is h ₃
, They are in the relationship of h ₁ <h ₂ <h ₃ . In addition,
In the figure, 6a, 6a 'and 6a indicate corners.

Next, as to the attachment of the chip to the base 1, as shown in FIG. 1, chip bases 3 are provided on the outer periphery of the disk-shaped base 1 at predetermined intervals in the circumferential direction. It will be fixed by brazing on both sides of the base plate 3 with both sides parallel to the rotation direction of the substrate.

First, one chip is brazed and fixed, and the next chip is fixed to the brazed state while the brazed and fixed chip is inverted.

Thereafter, the chips are alternately inverted and mounted on the base. At the time of mounting, it is difficult to accurately align the center of the chip with the center line between both side surfaces of the base body, so that both side surfaces of the base body are protruded from both side surfaces of the base body by substantially the same size, and one side surface of the base body 1
After aligning in parallel with one side surface, the width of uneven grinding surface is made uniform by performing width-determining processing such as truing on the grinding surface in irregular irregularity due to tip mounting error or machining error of the chip itself. To do.

In FIG. 2B, there are three steps on both sides in the width direction of the chip, that is, the depth t of the step depression is equal, but one step at the time of blade rotation is It shows an overlapping state with a chip that is inverted and attached. The attachment of the chip to the substrate is almost the same as that of the above embodiment, but the corners 7a and 7a 'of one chip are reversed and the corners 7b and 7b' of the chip are located between the center lines of one chip. The chip which is shifted from the center line between both side surfaces of the substrate 1 to one side by about t / 4 and is inverted to the other side is about t
/ 4 It is necessary to shift.

FIG. 2 (c) shows one side of the chip with three steps and the other side with two steps, but unlike FIG. 2 (a), the depth e of the two-sided step depression and the three-step side depressed In the embodiment in which the depths f are the same, the overlapping state of one chip when the blade is rotated and the inverted chip is shown, and the mounting of the chip on the base body is in accordance with the above embodiment. As can be understood from the above-described embodiments, when the blade is rotated, the corner of the chip mounted by one mounting and the corner of the chip mounted by reversing the mounting do not overlap at the same rotational position.

In the above-mentioned embodiment, all the chips are alternately inverted and attached, but the chips may be inverted and attached at intervals of any two chips or every three chips.

(Effects of the Invention) When grinding is performed with the blade having the above configuration, particularly in FIGS. 2A and 2B, when the blade is rotated, between the corners of one chip, and / or vertically. Since each corner of the inverted chip is located, grinding is performed with a chip that has a substantially large number of corners (steps), which is equivalent to the degree of step depression of the conventional chip side surface being mitigated, etc. A smooth cut surface can be obtained without streaky marks on the cut surface of the work material due to the transition of the step.

In Fig. 2 (c), even when the upper surface of the third step wears and the contact area with the work material becomes small, grinding is done by the upper surface of the second step of the tip that is mounted by reversing this and the third step. Since the same can be said on the side middle side surface and the second side lower surface, no streak-like marks are left.

Further, in any of (a) to (c) above, although there is a time lag, both side surfaces of the chip act on the grinding, and therefore only one side surface is stepwise as shown in FIG. Compared with the case where only one side surface acts on the grinding, extremely uneven wear does not occur, and the wobbling of the blade is alleviated, and the meandering of the cut surface can be prevented.

In this way, since one type of chip is mounted by reversing each other, it is not necessary to prepare two types of chips as shown in FIG. 3 (a), which is convenient when manufacturing or exchanging chips, and both sides of the chip are asymmetrical. Therefore, the direction of the chip is not mistaken when mounting it by reversing it.

Further, since the grinding process is performed by the stepped side surface of the tip and the front end surface in the blade rotation direction, the side surface resistance is small and the water flow to the processed surface is improved, so that the workability can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view partially showing an embodiment of the present invention and showing a chip in which one side surface of the chip is two steps and the other side surface is three steps, and a mounting state thereof. FIGS. 2A, 2B, and 2C are configuration diagrams showing a chip used in the present invention having a different shape and a state in which the chip is inverted and overlapped. FIGS. 3A and 3B are cross-sectional views of a tip of a conventional superabrasive grain type rotary blade. FIGS. 4 (a) and 4 (b) are explanatory views of the wear state when the tip of FIG. 3 is used. FIG. 5 is an explanatory diagram showing a rotary blade and a processing state. 1 ... Disc-shaped substrate, 2 ... Center hole, 3 ... Chip pedestal,
4 …… Chip, 4a …… 3rd side upper side, 4a ′ …… 3rd side middle side, 4a ″ …… 3rd side lower side, 4b …… 2nd side upper side, 4
b ′ …… Lower side of the second step, 5 …… Work material, 6a, 6a ′, 6b, 7a, 7
a ′, 7b ″ …… Corner, 8 …… Chip center line, 9,9 ′…
… Traditional rotating blade tips, 10 …… Diamond abrasive grains.

Claims (1)

[Claims] 1. A super-abrasive grain tip having a substantially short-sided shape whose both sides are parallel to each other is provided on the outer peripheral end face of a disk-shaped substrate with a predetermined interval so that both sides of the chip are parallel to the rotation direction of the substrate. In the attached superabrasive rotary blade, the width of the lower end surface of the chip is larger than the thickness of the substrate, and one side surface of the chip forms a side surface in which a corner is formed by stepwise recessing from the upper end surface connected to the upper end surface of the chip, The other side surface of the chip has a side surface in which a corner is formed by recessing a smaller number of steps than the one side surface, or the same number of steps as the one side surface is recessed, but is formed by stepwise recessing in the chip height direction. A chip having a corner formed on the other side having a height different from that of each corner on the one side is mounted alternately on the outer peripheral end face of the substrate in the rotation direction or by reversing the chip at an arbitrary chip interval, When rotating Superabrasive rotating blades, characterized in that a position corner of the chip by attaching the one does not overlap with a corner of a chip mounted inverted.