JP3024707B2 - Method for producing super hard needle-like abrasive grains and super abrasive grain grindstone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing abrasive grains used in superabrasive grains, that is, super hard needle-like abrasive grains.

[0002]

2. Description of the Related Art Abrasive grains used in conventional superabrasive grains are:
Natural diamond, artificial diamond produced by a high-temperature high-pressure method, or an explosion molding method, or CBN abrasive grains have been used.

[0003]

Since the shape of the abrasive grains is almost spherical, the abrasive grains easily fall off from the binder during grinding. Also, natural diamond cannot control the shape. In order to solve this problem, a diamond having a large particle diameter is divided into a plurality of flat plates, and a rod-shaped diamond obtained by finely cutting the flat-plate diamond is used, but the working efficiency is low. In addition, there is a problem that the manufacturing cost is high.

[0004]

A step (A) of vapor-phase growing diamond, diamond-like carbon, CBN or a CBN-containing BN thin film , between two pressure rollers.
Diamond, diamond-like carbon, CBN or
Pass through the substrate on which the CBN-containing BN thin film is formed, and
(B) dividing the diamond, diamond-like carbon, CBN or CBN-containing BN thin film into two-dimensional planes by the pressing force of the pressure roller ;
It manufactures in order of (B). And manufactured in this way
A superabrasive grindstone is manufactured using the obtained superhard acicular abrasive grains.

[0005] Diamond, diamond-like carbon, CBN or BN containing CBN is deposited on a substrate by vapor phase synthesis.
A thin film is formed and a diamond is placed between two pressure rollers.
, Including diamond-like carbon, CBN or CBN
Pass the substrate on which the BN thin film is formed, and
The diamond, diamond-like carbon, CBN, or the CBN-containing BN thin film are planarly divided by the pressure of the laser. Since diamond or CBN is formed in a flat plate shape from the beginning, it is not necessary to divide the plate into a flat plate shape, thereby improving work efficiency and reducing manufacturing costs.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, it has a width of several tens μm to several tens mm,
For example, a CVD method, PVD
, Diamond-like, CBN or CBN with a film thickness of about several nanometers to several millimeters by the method or IVD method
A thin film 11 containing BN is formed. Next, as shown in FIG. 2, when the substrate 10 is passed between the two pressure rollers 12,
Due to the pressing force of the pressure roller 12, slack enters the thin film 11 in a direction perpendicular to the longitudinal direction of the substrate 10, and the length is several tens μm.
It is cut, that is, divided into a plurality of needle-shaped abrasive grains having a length of about m to several tens mm and a width of about several μm to several mm. As a method for dividing the thin film 11, as shown in FIG.
Are formed in a direction orthogonal to the longitudinal direction of the substrate 10, and the protrusion 1
The thin film 11 may be formed on the back surface of the thin film 11 by forming the thin film 11 on the surface of the substrate 10 on which the thin film 3 is formed, and the thin film 11 may be divided at the concave portion by bending the thin film 11. Further, the thin film 11 may be finely cut using a laser cutter. Further, as shown in FIG. 4, a resist (for example, an ultraviolet curable resin) is applied to the substrate 10 on the opposite side of the thin film 11, and light (ultraviolet light) is irradiated on the resist through a mask. An oblique line portion 31 of the substrate 10 is melted with a corrosive agent, and the thin film 11 is bent when the substrate 10 is melted, thereby producing a superhard needle-like abrasive grain with a substrate. If the division is performed by this method, the shape of the abrasive grains can be freely controlled. In any case, the abrasive grains may be used with the substrate 10 attached, or may be used after removing the substrate 10. The substrate 10 is removed by using a corrosive agent.
By dissolving the In any case, since the plate-shaped thin film 11 is formed from the beginning, the dividing operation becomes easy. In the above-described embodiment, the example in which the thin film is divided in the left-right direction using the substrate 10 which is wide in the left-right direction and narrow in the front-rear direction has been described. However, as shown in FIG. If the thin film is divided in the left-right direction and the front-back direction using the substrate 10, a large number of superhard needle-like abrasive grains can be obtained.

As shown in FIG. 6, needle-like abrasive grains 14, a binder 15 composed of a phenolic resin, and an additive composed of chromium oxide are kneaded and mixed to form a billet. The material formed into a billet shape is stretched into a plate shape by two rolling rollers 16 and cut into a plurality. The cut pieces are stacked, and a plurality of the stacked pieces are prepared and rolling is repeated. When the direction of the abrasive grains 14 is aligned in one direction by rolling, it is cut into chips and fired at about 140 degrees to obtain a grindstone material 20.

[0008] As shown in FIG.
The needle-shaped abrasive grains 14 are arranged in a segment shape on the end face of the disk-shaped grinding wheel base 21 so that the longitudinal direction is perpendicular to the grinding surface, and fixed by a bond 22 or the like. By performing the above steps, a superabrasive grindstone in which the directions of the acicular abrasive grains 14 are aligned in a direction orthogonal to the grinding surface is manufactured.

The surface of the workpiece is ground while rotating the super-abrasive grindstone thus manufactured. Although the grindstone is worn in a direction perpendicular to the grinding surface, the abrasive grains 14 are arranged so that the longitudinal direction is perpendicular to the grinding surface.
There are many portions that are held by the binder 15, and the abrasive grains 14 do not fall off easily.

[0010]

As described above, according to the present invention, the step (A) of growing a cemented carbide chip on a substrate by vapor-phase growth of diamond, diamond-like carbon, CBN or a CBN-containing BN thin film is performed between two pressure rollers. , Diamond, da
Earmon Like Carbon, CBN or BN containing CBN
Pass the substrate on which the thin film is formed and apply the pressure roller.
Since the step (B) of dividing the diamond, diamond-like carbon, CBN or CBN-containing BN thin film into two-dimensional planes by pressure is manufactured, the work of dividing the diamond, diamond-like carbon, CBN or CBN-containing BN thin film into a flat plate shape is performed. Becomes unnecessary, and the work efficiency is improved. Further, an effect of reducing the manufacturing cost can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a thin film is formed on a substrate.

FIG. 2 is a diagram showing a state in which a diamond thin film is divided by a pressure roller.

FIG. 3 shows another modification in which a diamond thin film is divided using a depression.

FIG. 4 shows another modification in which a diamond thin film is divided using a corrosive agent.

FIG. 5 shows another modification in which the diamond thin film is divided in the left-right direction and the front-back direction.

FIG. 6 is a process chart for manufacturing a grindstone material.

FIG. 7 is a view showing a state in which a grindstone material is fixed to a grindstone base.

[Description of Signs] 10 Substrate 11 Diamond thin film 14 Abrasive grain 15 Bonding material 20 Grindstone material 21 Grindstone base

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C09K 3/14 550 B24D 3/00-3/60 C23C 16/00-16/56 C30B 28/00-35 / 00 C01B 21/064 C01B 31/06

Claims (2)

(57) [Claims] 1. A step (A) of vapor-phase growing a diamond, diamond-like carbon, CBN or a CBN-containing BN thin film on a substrate, wherein a diamond is placed between two pressure rollers.
, Diamond-like carbon, CBN or CBN
Through the substrate on which the BN-containing thin film is formed,
(B) dividing the diamond, diamond-like carbon, CBN or CBN-containing BN thin film into two-dimensional planes by the pressing force of the roller.
(B) A method for producing ultra-hard needle-like abrasive grains, which is performed according to the order. 2. A manufacturing method according to claim 1.
Super-abrasive grindstone manufactured using super-hard needle-like abrasive grains.