JPH0390308A - Cutter blade - Google Patents

Abstract

PURPOSE:To evade the wear the root of cutting tip and contrive to prolong the service life and to enhance the cutting efficiency of the cutter blade concerned by a method wherein guide recesses, by which chips are discharged, are formed at the outer peripheral side end of a rotary board. CONSTITUTION:A mounting hole 4 is formed at the center of a disc-like rotary board 2, at the outer periphery of which relief grooves 6 with radial depth to relieve chips are formed on the outer periphery of the rotary board at equal intervals. Cutting tips 8 made of diamond sintered body are fixed onto respective edge faces at its outer periphery. An annular hollow part 10 having a certain fixed radial width is formed to the outer periphery side of the board 2. A plurality of suction ports 12, through which air is taken in, are formed at equal intervals at positions, which are radially opposite to each other on the inner periphery side of the hollow part 10 on both side faces of the rotary board 2. When the rotary board 2 is rotated in the forwar direction or direction indicated with the arrow R, the air in the hollow part 10 is discharged from jets 14 with vigor by means of contrifugal force. Since the interior of the hollow part 10 is brought into negative pressure state as a result, air outside the rotary board 2 flows from the suction ports 12 in the hollow part 10 with vigor. The vigorous in-flowing and discharging of the air are maintained during the rotation of the rotary board.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cutter blade for cutting concrete, asphalt, brick, tile, stone, etc.

[Conventional technology]

Blades used in cutters for the above-mentioned work materials have conventionally been made by brazing a cutting tip made of sintered diamond onto the outer periphery of a rotating metal disc-shaped substrate. It is known that the rotating substrate has a thickness equal to or smaller than that of the cutting tip, and is formed to have a uniform thickness throughout.

[Problem to be solved by the invention]

By the way, in the conventional blade as described above, as shown in FIG. 5, the volume of the gap between the rotating substrate 42 and the side surface of the cutting groove G, that is, the chip discharge space, is small compared to the amount of cutting WM produced. Therefore, the chips M are separated from the rotating substrate 42 and the cutting tip 8.
It stays at the connection site and acts to pinch the connection site. In addition, the cutting tip 8 also wears out with cutting, and this abrasion dust mixes into the chips M. Therefore, the root part of the rotary board 42, which is made of a softer material than the cutting tip 8, is subject to severe wear. , which resulted in a constant thinning and premature wear of the blade. In addition, due to the increase in frictional heat, the cutting tip 8
There was also the problem that this caused thermal deterioration of the material, resulting in a decrease in cutting efficiency.

By reducing the thickness of the rotating substrate and increasing the void volume between the rotating substrate and the side surface of the cutting groove, problems caused by the accumulation of chips M can be avoided to some extent, but the basics of the rotating substrate necessary for cutting can be avoided to some extent. From the viewpoint of maintaining structural strength, there is a limit to how thin the wall can be made, and for this reason, conventional products still suffer from the above-mentioned problems.

Therefore, the purpose of this invention is to provide a cutter blade that can avoid wear at the root portion of the cutting tip while maintaining the basic structural strength of the rotating substrate, thereby extending the life of the blade and improving cutting efficiency. shall be.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a cutter blade comprising a disk-shaped rotating base plate having a drive shaft mounting hole in the center, and a cutting tip made of a diamond sintered body provided on the outer periphery of the rotating base plate. , a guide recess for discharging chips is formed at the outer peripheral end of the rotary base plate.

[Function] According to the present invention, chips generated from the cutting tip portion as the blade rotates are accommodated in the guide recess formed at the outer peripheral end of the rotary substrate, and the guide recess is moved by the rotational force of the blade. It moves and is ejected from the rear side of the blade.

〔Example〕

1 and 2 show an embodiment of the invention.

In addition, the same parts as the conventional one are indicated by the same reference numerals.

A mounting hole 4 for a drive shaft of a hand cutter or the like is formed in the center of the disk-shaped rotating base plate 2, and relief grooves 6 are formed on the outer periphery at equal intervals with a depth in the radial direction to release chips. It is formed. A cutting tip 8 made of a diamond sintered body is fixed to each end face of the outer periphery which is divided by the formation of each escape groove 6.

An annular cavity 10 having a constant width in the radial direction is formed near the outer circumferential side of the rotating substrate 2, and an annular cavity 10 for taking in air is formed on the inner circumferential side of the cavity 10 on both sides of the rotating substrate 2. A plurality of air intake ports 12 are formed at equal intervals with opposing positions in the radial direction.The air intake ports 12 on the front surface side and the air intake ports 12 on the back surface side are formed with positions slightly shifted from each other.

Each intake port 12 is formed so as to communicate with the cavity 10 so as to face in the direction of arrow R, which is the direction of rotation of the rotary substrate 2 .

Further, a spout 14 is opened in a corresponding portion of the cavity 10 to each relief groove 6.

Therefore, each intake port 12 and each jet port 14 are in communication via the cavity lO.

The rotating substrate 2 is formed by overlapping two thin molded plates 16, 1B, and the cavity 10 is formed by overlapping each molded plate 16.
Annular raised portions 20 .
It becomes a closed space between 22. In addition, the raised portion 20.22
The width n between them is set smaller than the width W of the cutting tip 8.

In this example, each molded plate 16.18 is made of stainless steel with a plate thickness of 0.5 mm, the width between the protrusions 20.22 is 1.4, and the width of the cutting tip 8 is 2.2. −.

Guide recesses 24 and 26 for discharging chips M are formed on the front and back sides of the outer circumferential end of the rotary base Fi2, respectively. Each guide recess 24, 26 results from the formation of a bulge 20.22 on the respective molded plate 16.18. The thickness between each guide recess 24 and 26 [is the width W of the cutting tip 8
In relation to this, the guide recesses 24 and 26 should be appropriately determined within a range that can avoid the accumulation of chips M and provide good fixing strength for the cutting tip 8. The reduction in the structural strength of the rotary substrate 2 due to the thinning of the outer peripheral end is compensated for by the raised portions 20 and 22. In this example, in particular, since the molded plates are joined together, the thickness t between the guide recesses 24 and 26 can be made thinner with respect to the width W of the cutting tip 8 while maintaining good structural strength of the rotary substrate 2. In addition, cutter blades require flatness accuracy of the rotary board 2 to suppress center runout, but in the case of a two-plate structure like this example, it is easier to adjust the brightness compared to a single-plate structure, and the blade It is also easy to increase the diameter.

Next, the operation for discharging chips M will be explained. The chips M generated at the cutting tip 8 are guided to the guide recesses 24 and 26 as shown in FIG.
4 and 26 become flows shown by arrows P and Q, move toward the rotation direction, and are discharged from the rear of the rotating substrate 2. By being accommodated and moved in the guide recesses 24 and 26, accumulation of the chips M is avoided, and a state of discharge without stagnation is obtained.

As a result, the friction at the root of the rotating base [2 with the tip] is reduced, and wear and tear is avoided. In addition, thermal deterioration of the cutting tip 8 due to frictional heat is avoided, and cutting efficiency is improved. Also,
In this example, as shown by arrow S, the outside air taken in by the intake port 12 is jetted out from the jet port 14 due to centrifugal force, comes into contact with the cutting tip 8, and flows through the guide recesses 24 and 26 in the rotational direction.

Therefore, the cutting part is cooled and thermal deterioration of the cutting chip 8 is greatly suppressed, and the movement of the chips M is promoted and the discharge efficiency thereof is increased.

Also, in this example, the outer peripheral end 28.3 of the molded plate 16.18
0 is bent outward, thereby cutting the cutting tip 8
The brazing area is expanded and the fixing strength is increased.

The intake port 12 is formed, for example, by forming a long hole 32 on the inner peripheral side of the raised portion 20.22 and bulging one edge outward in the thickness direction of the rotating base [2] by pressing or the like. The size of the bulge is determined so that the opening area of the intake port 12 effective for air inflow is approximately the same as the area of the jet port 14.

The outer surface of the intake port 12 is formed into a curved or streamlined shape with a gradually decreasing amount of bulge in order to reduce air resistance. Each molded plate 16, 18 has raised portions 20, 22, etc. formed by pressing or the like, and then joined by means such as spot welding.

When the rotation a[2 is rotated in the direction of arrow R, which is the forward rotation direction, the air in the cavity 10 is moved to the jet nozzle 14 by centrifugal force.
It is expelled vigorously. As a result, the inside of the cavity 10 becomes in a negative pressure state, so that air outside the rotary base [2 flows forcefully into the cavity 10 from the intake port 12. This forceful air inflow and outflow is maintained during rotation.

Next, FIGS. 3 and 4 show cutting conditions when used attached to a hand cutter.

The hand cutter body 36 is fixed to the hand cutter body 36 by inserting the drive shaft 38 of the hand cutter body 36 through the mounting hole 4 of the rotating board 2, and the drive shaft 38 is fixed to the workpiece C such as concrete.
The depth of cut d is set with the 0 position zai adjustment.

The air that has flowed forcefully into the cavity 10 from the intake hole 12 is guided toward the outer periphery of the cavity 10 by centrifugal force due to rotation, as shown by the arrow, and is vigorously discharged from the jet port 14 radially outward. As a result, the cutting tip 8 is cooled, and the chips M are blown away toward the discharge port 40 at the cutting site. In this case, along with the suction force of a dust collector (not shown) connected to the discharge port 40, the cutting waste M is removed from the discharge port 40.
Good transport to the 0 side.

The path for the air taken in from the intake port 12 to be discharged from the jet port 14 is extremely short, and the cavity lO has a certain width, so the temperature rise and supply of air due to the long and narrow supply path. This makes it possible to avoid a decrease in the amount of water, thereby improving cooling efficiency. Furthermore, since an air compression source such as a compressor is not required, peripheral equipment can be significantly downsized and the invention can be applied to small and lightweight drive bodies such as hand cutters.

As a result of a comparative experiment of cutting tip surface temperature under the same conditions between the blade shown in this example and a conventional blade in which the rotating substrate is formed of a single plate, it was found that
After cutting, the results were 58°C for this example and 90"C for the conventional one. After am cutting, the results were 90°C for this example and 120°C for the conventional one. Experimental results have confirmed that the heat suppression performance and cooling efficiency are extremely high compared to conventional products.

In this example, specific shapes are illustrated for the intake port 12, the jet port 14, and the cavity 10 that communicates these, but the shape is not limited to these and can be determined as appropriate within a range that can maintain good cooling efficiency. It is something.

Furthermore, although the spout 14 is formed by opening a portion of the cavity 10 corresponding to the relief groove 6, for example, a through hole that penetrates the cutting tip 8 in the radial direction of the rotary substrate 2 and communicates with the cavity 10 is formed. It is also possible to form a shape.

Further, the same function can be obtained not only by applying the blade to a blade having a cutting tip 8 made of a diamond sintered body but also to a blade having a cutting tip formed by sintering cemented carbide, superhard ceramic, etc. It is something.

In addition, in this example, the rotating board 2 is molded by molding it6.1B.
Although a laminated structure is used, it is of course possible to use a single-panel structure. In this case, the guide recesses 24 and 26 can be formed by rolling or other means.

〔Effect of the invention〕

According to this invention, chips are guided and discharged by the guide recess formed at the outer peripheral end of the rotary substrate, so that accumulation of chips is avoided and friction is alleviated. This reduces wear on the outer peripheral end of the rotary substrate, thereby extending the life of the blade. In addition, since thermal deterioration of the cutting tip is suppressed, cutting efficiency can be improved.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the cutter blade according to the present invention, and FIG. 2 shows its cutting state.
Figure 3 is a schematic sectional view taken along line ■-m in Figure 1, Figure 4 is an overall sectional view taken along line ■-IV in Figure 3, and Figure 5 shows conventional chips. It is a figure showing the discharge state of. 2...Rotating board, 4...Mounting hole 8...Cutting tip 24.26...Guiding recess, M...Chip 38...Drive shaft

Claims (1)

[Scope of Claims] A cutter blade comprising a disk-shaped rotating substrate having a drive shaft mounting hole in the center, and a cutting tip made of a diamond sintered body provided on the outer periphery of the rotating substrate, comprising: A cutter blade characterized in that a guide recess for discharging chips is formed at a side end.