JPH03208562A - Super abrasive grain rotating blade - Google Patents

Abstract

PURPOSE:To obtain a smooth cutting face without leaving a streak like trace on the cutting surface of the member to be cut at the transition stage of a step accompanied by the tip wear with the grinding by the tip having many corners number actually, by setting the corner of the tip by the fitting of one part at the position not duplicate with the corner of the tip fitted with its reversal, at the blade rotation time. CONSTITUTION:Tip both side faces (4a, 4a', 4a''), (4b, 4b') form the side faces on which corners (6a, 6a', 6b), (7a, 7a', 7b) are formed by stepped recesses from the supper end face thereof and yet because of their being of the right and left asymmetric type, each corners of the tip fitted with its reversal become to be located among each corners of the tip and/or the top and bottom of the corner, at the blade rotation time by fitting each tips with their reversal. In the case of performing grinding in this state, one side face of a processing groove is worked by the tip upper side face most projected to one side of the base body 1 end face and thereafter according to the wear of the tip the step like side faces (4a, 4a', 4a''), (4b, 4b') projected in order become related to the processing.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a superabrasive rotating blade made of diamond, CBN (cubic boron nitride), etc., which is mainly used for cutting stones, concrete, etc.

(Prior Art and Problems to be Solved) FIG. 5 shows a diamond rotating blade together with the processing state.

As shown in the figure, a disc-shaped base 1 can be attached to a rotating shaft through a center hole 2, and a large number of chip pedestals 3 are formed at predetermined intervals on its outer peripheral surface.

A diamond chip 4 having a diamond layer formed on its upper layer is mounted on the pedestal 3.

Both sides of this chip 4 are arranged parallel to the rotational direction of the base end face. Generally, when the blade diameter is small, it is fixed to the base 3 by brazing, etc., and when the diameter is large, a dovetail groove etc. is used. Some are now removably attached by a mechanical fit.

Grinding is carried out by rotating the blade as shown in the figure.
This is done by cutting a certain amount into the hole.

In that case, both sides of the tip 4 and the front end surface in the rotating direction of the blade serve as abrasive surfaces that bite into the workpiece, but during grinding, a large amount of frictional heat is generated, so there is no grinding liquid between the blade and the workpiece. It is necessary to continuously supply and sufficiently cool the processing section.

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

The first is, as shown in FIG. 3(A), two types of chips, a chip 9 formed in three symmetrical steps on both sides of the chip, and a chip 9' formed in two steps, for example, in three steps. chip 9
The two-stage chip 9' is fixed at a predetermined interval on the outer peripheral end surface of the base body at a ratio of 2 to 1 two-stage chip 9'.

By the way, the three-stage tip 9 reduces the resistance on the side of the tip during grinding and enables smooth grinding, but the upper layer of the tip wears out, and as shown in Fig. 4 (a), the side surface of the tip is extremely worn. If the area of contact with the material becomes small, it will leave streak-like marks on the cut surface of the workpiece, and if uneven wear occurs as shown in Figure 4 (b), the blade will swing and the cutting will be interrupted. The surface becomes meandering.

In order to compensate for the drawbacks of the three-tiered chip, two-tiered chips were placed between the three-tiered chips at a certain ratio.
There have been problems in that different types must be prepared, which takes time and effort in chip production, and causes inconvenience in chip replacement.

Second, as shown in Fig. 3 (b), chips with only one side of the chip having a stepped shape and the other side of the chip having a non-stepped shape are arranged on the outer peripheral end surface of the base body by alternating or inverting them at arbitrary chip intervals. (Japanese Unexamined Patent Publication No. 277270 of 1982, etc.).

In this configuration, the fixing of the chip to the end face of the substrate is determined only by the stepped side surface, and the non-stepped side surface is left to the variation of the chip, so width determining processing such as truing is not necessary, but grinding is performed every other chip. The problem is that the stepped sides are worn quickly, and before the end of the insert's useful life, both sides become non-stepped and the cutting force increases. It became.

Furthermore, the problem that a uniform cut surface cannot be obtained due to the streak-like marks remaining on the cut surface due to wear of the tip has not been solved.

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

Regarding the shape of the tf chip, as shown in Figures 1 and 2 (a) and (c), both sides of the chip are structured in stages, but the number of stages is different on one side and the other side. Or, as shown in FIG. 2 (11), the number of stages on both sides is the same, but the stage configuration differs in the height direction of the chip, making it a left-right asymmetric type. The chips are mounted on the outer peripheral end surface of the base body alternately or inverted at arbitrary chip intervals as shown in FIG.

(Function) As mentioned above, both sides of the tip are gradually recessed from the upper end surface to form corners, and since they are asymmetrical, each tip can be installed with the tips turned upside down so that the blade can rotate easily when the blade rotates. , between each corner of the chip, and/or each corner of the chip mounted upside down will be located above and below the corner.

When grinding is performed in this state, one side of the machined groove is machined by the top surface of the chip that protrudes the most from the end face of the base body, and then the stepped side surface of the chip that protrudes sequentially as the chip wears becomes involved in the machining. .

(Example) Figure 2 (A) shows an example of the present invention in which one side of the chip is made up of two stages and the other side is made up of three stages. This indicates the duplicate status of the group.

The chip is a metal-pound diamond chip with an upper end surface slightly curved in the length direction and parallel both side surfaces, which are approximately short-shaped, and the width of the lower end surface is larger than the thickness of the base body, Grinding is also possible on both lower sides. However, there are few diamond abrasive grains lO in the bottom layer of the chip, making it easier to braze to the base (
See Figure 1 wA).

Here, to explain the step configuration of the chip, in the chip width direction, the dimension from the chip center line 8 to the upper surface 4a on the third stage side is dl + the dimension from the chip center line 8 to the upper surface 4b on the second stage side. From d2 + 8, middle side 41 on the 3rd step side
If the dimension from d3 + 8 to the same side lower surface 41 and the second step side lower surface 4b' is d4, these are a
The relationship is t>a2>d3>d4. In addition, in the chip height direction, the dimension of the upper surface 4a in the height direction is h++
If the dimension of the upper surface 4b on the second stage side in the same direction is bQ+the dimension from the upper end surface of the chip to the lower end of the middle surface 41 is h3, then these have the relationship hs<ha<ha. In the figure, ea+em'. 8b indicates a corner.

Next, regarding the attachment of the chip to the base body 1, as shown in FIG. ! 3 with both side surfaces parallel to the direction of rotation of the base body.

First, one chip is soldered and fixed, and the next chip is soldered and fixed with the soldered chip reversed.

Thereafter, the chips are alternately reversed and attached to the base. When installing the chip above, it is difficult to accurately align the center of the chip with the center line between both sides of the base, so both sides of the chip are made to protrude from both sides of the base by approximately the same dimension, and the side surfaces of the chip are aligned with the center line between the sides of the base.
After aligning the abrasive surface so that it is parallel to one side, width-setting processing such as truing is performed on the abrasive surface, which is irregularly uneven due to an error in the installation of the tip or an error in the processing of the tip itself, to make the uneven abrasive surface uniform. do.

In Fig. 2 (0), there are three stages with the same depth t in the chip width direction on both sides, but for chips with different stage configurations in the height direction, one chip and this when the blade rotates. This shows the overlap with the chip installed upside down. The attachment of the chip to the substrate is almost the same as in the previous embodiment, except that the corners 7a and 7a' of the chip and the corner 7b of the chip that is reversed. It is necessary that the centerline of the chip be shifted approximately 7b' to the other side so that 7b' is located between each side.

4 In Fig. 2 (C), one side of the chip has three steps and the other side has two steps, but unlike Fig. 2 (A), the depth e of the step depression on the second step side and each step on the third step side are different from Fig. 2 (A). This shows an example in which the depth f of the stepped depressions is the same, and the overlapping state of one chip and the reversed chip when the blade is rotated, and the attachment of the chip to the base is in accordance with the above example. . As can be understood from the above embodiments, when the blade is rotated, the corners of the tip mounted on one side and the corner of the tip mounted in reverse will not overlap at the same rotational position.

In the above-mentioned embodiments, the chips are attached alternately by being reversed, but the chips may be reversed and attached at arbitrary intervals such as every 2 or 3 chips.

(Effect of the invention) When grinding is performed with the blade configured as described above, especially in FIGS. 2(a) and (x), when the blade rotates, the By positioning each corner of the inverted insert, it is possible to grind with an insert that essentially has a large number of corners (number of stages), which is equivalent to reducing the degree of gradual depression of the side surface of the conventional insert, which is caused by insert wear. A smooth cut surface can be obtained without leaving any streak-like marks on the cut surface of the workpiece at the transition point of the steps.

In Fig. 2 (c), even if the upper surface on the 3rd stage side wears out and the contact area with the workpiece becomes smaller, the grinding is performed by the upper surface on the 2nd stage side of the tip which is installed by reversing this. The same thing can be said for the middle side surface on the step side and the lower side surface on the second step side, so no streak-like marks remain.

Also, in any of the above (a) to (c), although there is a time lag, since both sides of the chip act on the grinding, only one side is stepped and the corresponding one as shown in Figure 3 (0). Compared to the case where only one side is used for grinding, extremely uneven wear does not occur, the deflection of the blade is alleviated, and meandering of the cut surface can be prevented.

In this way, since one type of chip is installed with each chip reversed, there is no need to prepare two types of chips as shown in Figure 3 (a), which is convenient when manufacturing or replacing the chip, and both sides of the chip are asymmetrical. Therefore, there is no need to make a mistake in the orientation of the chip when reversing it and installing the chip.

Furthermore, since the grinding process is performed by the stepped side surface of the tip and the front end surface in the rotational direction of the blade, side resistance is small and water flow to the machined surface is improved, improving workability.

[Brief explanation of drawings]

FIG. 1 is a perspective view partially illustrating an embodiment of the present invention, showing a chip with two levels on one side and three levels on the other side, and a state in which the tips are attached. FIGS. 2(a), 2(0), and 2(c) are configuration diagrams showing chips used in the present invention having different shapes and a state in which the same chips are inverted and overlapped. Figure 3 ({). (0) is a chip sectional view of a conventional superabrasive rotary blade. FIGS. 4(a) and 4(0) are explanatory diagrams of wear conditions when the tip shown in FIG. 3 is used. FIG. 5 is an explanatory diagram showing the rotating blade and the machining state. DESCRIPTION OF SYMBOLS 1... Disc-shaped base body, 2... Center hole, 3... Chip pedestal, 4... Chip, 4a... 3rd step side upper surface, 41
... 3rd stage side middle side, 41... 3rd stage side lower side, 4b.
...Upper side of 2nd stage side, 4b''...Lower side of 2nd stage side, 5...
- Work material, Ga, Ga', Gb, 7a, 7a'. 7
b'-=corner 8...chip center line, 8,1...
- Conventional rotary blade tip, 10...diamond abrasive grain. Arithmetic = ds → (c) Arithmetic 3 Figure (a) Arithmetic 4 eye (a) (υ)

Claims (1)

[Claims] (1) A substantially short-shaped superabrasive chip with both sides parallel to each other is mounted on the outer peripheral end surface of a disc-shaped base at a predetermined interval with both sides of the chip parallel to the rotating direction of the base. In a superabrasive rotary blade, the width of the lower end surface of the chip is larger than the thickness of the base body, and one side of the chip has a corner formed by being depressed in stages from the upper surface connected to the upper end surface of the chip. The other side surface of the chip is formed by recessing a few steps from the one side surface to form a corner, or the other side surface is recessed by the same number of steps as the one side surface, but is formed by recessing stepwise in the chip height direction. The chips forming the other side, the corners of which are at different heights from the corners of the one side, are mounted on the outer peripheral end surface of the base body alternately in the rotational direction or with the chips reversed at arbitrary chip intervals, and when the blade rotates. , a superabrasive rotary blade characterized in that the corner of the tip attached to one of the tips is located at a position that does not overlap with the corner of the tip attached inverted.