JPH0451981Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a cutting grindstone (for example, a cutting grindstone attached to a rotating body such as an electric tool and used for cutting ultra-hard materials such as concrete or stone). (rotating cutting blade).

[Conventional technology]

Conventionally, circumferential and circumferential diamond cutting blades with diamond particles electrodeposited on the cutting surface are known, but with these cutting blades, when the diamond particles attached to the periphery wear out and the substrate edge is exposed, However, there are problems in that the cutting process cannot be cut easily, the service life is limited, and cutting waste particles adhere to the substrate surface, requiring a large rotational torque for cutting.

Therefore, a rotary cutting blade that solves the above-mentioned problems is currently known as disclosed in Japanese Patent Application Laid-open No. 152375/1983.

This rotary cutting blade has recesses and protrusions arranged at regular intervals around the entire outer periphery of a thin steel substrate, and is arranged in a staggered manner near the rows of recesses on the outer periphery of the substrate. It has a structure in which small holes are provided continuously, and diamond fine particles are attached along the periphery, the notch, and the edges of the small holes.

[Problem that the invention attempts to solve]

As the rotating cutting blade cuts the material to be cut,
The protrusions gradually wear out and reach the first row of small holes before the recesses disappear, causing new recesses to appear and forming new protrusions in each recess. As the wear wears out in this way, the first row of small holes is reached first, and then the second row of small holes are reached before the dents disappear due to further wear and the process repeats, so the condition is always repeated. Recesses and protrusions can be regenerated and maintained.

However, with this rotary cutting blade, the depth of the notch, that is, the shape (length) of the protrusion changes as it wears, making it difficult to obtain stable cutting efficiency or When the depth is shallow, there are problems such as a decrease in the evacuation effect of cutting debris, an increase in cutting resistance, tooth spillage, and a decrease in cutting speed.

The present invention was developed as a result of studies in view of the above-mentioned conventional problems, and its purpose is to provide a cutting wheel that always has a constant cutting efficiency.

[Means for solving problems]

That is, the present invention has grooves arranged at regular intervals along the entire outer periphery of a thin steel disc in contact with the material to be cut, and continuous grooves arranged close to the grooves on the outer periphery of the steel disc. A cutting whetstone in which diamond abrasive particles are attached to the outer periphery of a steel disc, including the edges of each small hole drilled,
In the circumferential direction of the outer periphery of the steel disc,
The cutting edge portion is formed in a stepped manner by arranging the depths in a stepped manner with gradually varying depths, and the small holes are formed near the concave groove array on the outer periphery of the steel disc, and Diamond abrasive grains are arranged continuously in the deepest grooves at regular intervals and spirally from the outer peripheral edge of the steel disc toward the center, and are arranged on the outer peripheral edge of the steel disc including the grooves and small holes. The above-mentioned problems were solved by depositing layers.

〔Example〕

Embodiments of the present invention will be described below in detail based on the drawings. As shown in FIGS. , grooves 2, 2... with a constant interval in the circumferential direction.
... are arranged in a row, thereby forming saw-blade-shaped cutting edge portions 3, 3, . . . between the respective grooves 2, 2.

The grooves 2... are formed stepwise in the circumferential direction of the steel disk 1 by gradually varying their depths a, so that the grooves 2a having the shallowest depth a, The deepest grooves 2c are formed adjacent to each other,
A step b of an appropriate size is created in the radial direction of the steel disk 1 between the bottom surface 2b of the groove 2a and the bottom surface 2d of the groove 2c, so that the length of the cutting edge portion 3... , are formed into slightly different step-like shapes.

Also, a large number of small holes 4 are formed around the outer periphery of the steel disc 1.
... are arranged in at least two rows in a spiral pattern from the outer peripheral edge of the steel disk 1 toward the center, close to the rows of the grooves 2 and continuous to the deepest grooves 2c at regular intervals. It has been set up.

Further, diamond abrasive particles are electrodeposited on the edges of each groove 2 and each small hole 4 and the entire outer peripheral edge 1a of the steel disk 1 to form a diamond abrasive layer 5, and the cutting The grindstone is made up of:

Next, a specific example of the proposed cutting wheel will be explained.

An example in which the steel disc 1 has a diameter of 100 mm will be described.

The bottom surface of each of the grooves 2 above is formed into a circular arc surface with a diameter of 2 mmφ, and the depth a (dimension from the tip of the cutting edge portion 3 to the bottom surface of the groove) is approximately 2 mm at the deepest one, and about 2 mm at the shallowest one. In this case, it should be about 0.5mm.

Then, the depth a of the grooves 2 is gradually deepened in the circumferential direction of the steel disc 1 from the groove 2a with the smallest depth a, so that the total number of grooves 2 is 70.
The concave grooves 2 are formed at equal pitches so that they are located at the front and back of the body.

Here, it is desirable that the pitch angle of the concave grooves 2 be around 5 degrees.

On the other hand, each of the small holes 4... has a diameter of 2 mm, for example.
The small holes 4 are formed to have the same size such as φ, and the small holes 4 are spirally formed in the circumferential direction from a position substantially parallel to the bottom surface 2d of the deepest groove 2c of the grooves 2... They are arranged in about two rows at the same pitch toward the center of the steel disc 1 with a pitch angle of about 5°.

Also, the bottom part of the deepest groove 2c, the center of the first small hole 2' of the first row of small hole groups 4a, each small hole 4 of the first row of small hole groups 4a, and the second row of small holes. hole group 4
The distances from the center of each of the small holes 4 in b are provided at equal intervals.

In the above configuration, the cutting whetstone is attached to a rotary drive body such as an electric tool, and is used to cut a super hard material to be cut.

Cutting debris generated during cutting work is removed from the groove 2 on the outer periphery.
. . . and are repelled to the outside by the rotational force. Similarly, cutting debris also accumulates in the small holes 4 . . . and is discharged to the outside.

As the cutting operation is carried out in this manner, the material to be cut is first cut by the diamond abrasive layer 5 electrodeposited on the outer peripheral surface of the cutting edge portion 3. The diamond abrasive grain layer 5 is reduced, and the saw blade-shaped cutting edge 3 provided on the entire outer peripheral edge 1a gradually wears out, and the state shown in FIG.
As shown in the figure, when at least half of the cutting edge portion 3 in the circumferential direction wears out, the remaining half remains as the cutting edge portion.

Furthermore, when the remaining half of the cutting edge portion 3... gradually wears out and reaches the state shown in Fig. 5, the small hole group 4a in the first row
As it approaches small hole 4..., a new groove appears.

In this way, since the small holes 4 are formed in a spiral shape, the depth of the groove is always constant, that is, the depth is more than half the diameter of the small holes 4 in the radial direction of the steel disc 1. Since the concave grooves 2 and the cutting edge portions 3 are formed, it is possible to obtain a constant cutting efficiency that is the same as at the beginning of use.

That is, as the cutting edge part 3... wears away, the shape of the cutting edge part 3... changes from the unworn state in FIG. 3 to the steel shape as shown in FIGS. 4, 5, and 6. A concave groove 2 is formed in the length of more than half of the circumferential direction of the disc 1.
...and the cutting edge part 3... appear, and the cutting edge part 3...
Since the length l in the circumferential direction having ... is always constant, a constant cutting efficiency can be obtained.

[Effect of idea]

As explained above, since the cutting wheel according to the present invention is constructed, even if the cutting edge portion 3 of the outer peripheral edge 1a wears out, the concave grooves 2 having slightly different depths in a stepped manner...
The small holes 4 formed continuously in the deepest groove 2c in a spiral shape form a constant groove 2 and the cutting edge 3 over a length of at least half the circumference of the steel disc 1.
Because of this, the cutting efficiency per unit rotational speed can always be kept constant, so compared to a conventional rotary cutting blade that has a cutting edge of the same shape on the outer periphery, the cutting efficiency per unit rotation speed can be kept constant. The speed is improved, and
Due to the wear during cutting, the concave grooves 2 and the cutting edge part 3 are always formed at a constant length in the circumferential direction, so cutting chips can be constantly discharged to the outside, and small holes 4 are formed in a spiral shape. By arranging the cutting wheels in a row, there are practical effects such as good discharge of cutting debris caused by the rotation of the cutting wheel and no chipping or tooth loss of the material to be cut.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the cutting wheel according to the present invention, FIG. 2 is an enlarged plan view of section A in FIG. 1, and FIGS. 3, 4, 5, and 6 are FIG. 3 is a plan view showing the state of wear of the cutting wheel in order. DESCRIPTION OF SYMBOLS 1...Steel disk, 1a...Outer periphery, 2...Concave groove, 2c...Deepest concave groove, 3...Blade tip, 4...
...Small holes, 5...Diamond abrasive grain layer.

Claims (1)

[Scope of utility model registration request] Concave grooves arranged at regular intervals along the entire outer periphery of a thin steel disc in contact with the material to be cut, and small holes continuously drilled close to the grooves on the outer periphery of the steel disc. In a cutting wheel formed by adhering diamond abrasive particles to the outer peripheral edge of a steel disk including each edge of the groove,
In the circumferential direction of the outer periphery of the steel disc, the depths are gradually made slightly different and are arranged in a step-like manner to form a stepped cutting edge, and the small holes are formed on the outer periphery of the steel disc. , close to the row of grooves and continuous to the deepest groove at regular intervals,
A cutting characterized in that a layer of diamond abrasive grains is arranged spirally from the outer peripheral edge of the steel disc toward the center, and is attached to the outer peripheral edge of the steel disc including the grooves and small holes. Whetstone.