JP2858700B2 - Abrasive paper using cubic boron nitride - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a polishing paper using a novel cubic boron nitride, and more specifically, to the shape and the shape of cubic boron nitride. The present invention relates to an abrasive paper whose cutting and life have been improved by devising the orientation.

(Conventional technology) Cubic boron nitride (CBN, the same applies hereinafter) has the hardness next to diamond, and has better thermal and chemical stability, especially for iron-based materials than diamond. Is also very promising as a grinding material, and has already been used considerably.

In general, the particle shape of CBN particles is polygonal and has a blocky shape in which the distance between the opposite sides is almost the same, and this is used as it is and bonded to a base material with an adhesive.

(Problems to be Solved by the Invention) However, the conventional CBN abrasive paper uses blocky-shaped CBN particles, so the orientation of the CBN particles is random, and on the surface of the cloth in contact with the abrasive, The flat surfaces of the CBN particles are exposed, as are the edges. Since the cutting of CBN is originally caused by the sharp edges of CBN particles, conventional abrasive paper using blocky CBN is not sufficiently abrasive, and the good properties of CBN are fully exploited. Not.

Also, if the blocky CBN particles are polished to about 2/3 of their diameter, the particles will fall off, shortening the life of the abrasive paper, and the dropped particles will scrape off the adhesive and remove the CBN. Accelerates the shedding of particles.

SUMMARY OF THE INVENTION An object of the present invention is to provide a polishing paper which can sufficiently bring out the original excellent performance of CBN such as cutting and abrasion resistance and has a long life.

(Means for Solving the Problems) According to the present invention, there is provided an abrasive cloth obtained by bonding a plate-like CBN, for example, a hexagonal plate-like CBN to a base material with an adhesive, wherein the plate-like CBN is provided.
Is provided, wherein the main surface of the CBN is substantially upright with respect to the substrate and the main surface of the plate-shaped CBN is oriented parallel to the polishing direction.

As described above, the conventional CBN had a blocky particle shape. However, in Patent Application No. 1-51878, the present inventors reported that a C source (eg, stearic acid, palmitic acid, docosan, terphenyl, melamine, , Urea, carbon, carbon black, B ₄ C, etc.) and a layer containing a hexagonal boron nitride and a layer containing a CBN synthesis catalyst are laminated and subjected to high-temperature and high-pressure treatment. Less than,
It has been proposed to produce a plate-like CBN having a large plate-like ratio (preferably from 2 to 20) (the plate surface is composed of {111} surfaces). The present invention provides such a novel hexagonal plate-shaped CBN.
(Hereinafter referred to as a plate-shaped CBN), so that the sharp edge of the plate-shaped CBN bites into the material to be polished.

Hereinafter, the configuration of the present invention will be described in detail with reference to the drawings.

FIG. 2 schematically shows plate-shaped CBN2, and 2a is its main surface. Usually, the particle size of the plate-like CBN is 500 to 600 μm. FIG. 1 schematically shows a cross section of the abrasive paper, 1 is a substrate, and 3 is an adhesive. A fiber reinforced paper can be used as a base material, and a phenol resin or the like can be used as an adhesive. In the adhesive 3, the plate-shaped CBN2 is arranged in various directions, and the ratio of CBN particles in which the edge at an angle of about 90 ° appears on the cloth paper surface as in 2a, 2b, 2c, 2d , The polishing performance is improved. The polishing performance can be further improved by increasing the ratio of the CBN particles 2a to 2d as described above. Preferably, the plate-like CBN 2 is oriented upright so that the statistical distribution of the central axis XX ′ of the plate-like CBN 2 falls within ± 30 ° with respect to the direction perpendicular to the polishing paper, so that excellent polishing performance is obtained. Can be achieved. The direction of the upright CBN is rotatable around the central axis XX ', but when the polishing direction of the polishing cloth is determined before use, the main surface 2a faces the polishing direction. The orientation is preferably as described above, and the orientation may be parallel to the polishing direction as in 2e.

The CBN polished paper of the present invention is provided by an ordinary method in which an adhesive such as a phenolic resin is applied to the paper and the plate-like CBN or the plate-like CBN coated with the above resin or the like is electrostatically adhered thereto.

When providing abrasive paper with plate-shaped CBN oriented upright,
A fixing adhesive is previously attached to the base material, and CBN is electrostatically adhered thereon.

When electrostatically attaching plate-shaped CBN, the plate-like grains are oriented in a random direction in the electrolyte and adhere to the substrate in a non-oriented state if they are attached as they are. By passing through the slit at least once, the direction of the plate-like grains is controlled.

That is, as shown in FIG.
If it is smaller than the diameter of N2 and slightly larger than the thickness, it becomes a plate
Of the CBN2, only those whose main surface 2a is oriented in a specific direction (arrow) pass through the slit 4, but those which are inclined like 2 ', or whose direction is shifted from 2 to 90 ° like 2'' Cannot pass through the slit, so that CBN having a specific orientation adheres to the conductive paste.

Thereafter, the plate-shaped CBN is fixed to the substrate by a method such as further applying a resin if necessary.

(Function) In the present invention, by using plate-like CBN in the polishing layer of the polishing cloth, the angle at which the CBN particles contact the material to be polished is larger than in the conventional case using blocky CBN. As a result, the polishing amount per unit power has increased. Further, the abrasive cloth of the present invention has a longer cutting edge height and a longer life than the conventional case.

 Hereinafter, the present invention will be described in more detail with reference to examples.

(Example) HBN (manufactured by Showa Denko UHP-P; particle size - average 6 to 8 [mu] m, purity _{-99.6%, B 2 O 3 -0.3} %) 100 parts (parts by weight, hereinafter the same) to stearic acid as C source (CH ₃ (CH ₂ ) ₁₆ (COOH)) was added. Then, a hydrogenated alkali was added and mixed 10 parts LiCaBN ₂ -100 parts as CBN synthesis catalyst. Thereafter, a sample obtained by laminating the HBN molded body and the CBN molded body was 40 to 60 kbar, and 1400 to 1600.
By treating at ℃, hexagonal plate-like CBN particles having blackish brown and {111} planes were preferentially grown in the HBN compact. The average particle size of the CBN particles is 500
μm, and the plate ratio was 5-6.

About 0.02 g / cm ² of phenol resin is applied to fix CBN on the base paper, and then
Plate-like CBN having an average particle size of 500 μm and a plate-like ratio of 5 was electrostatically adhered to cloth paper through slits at 0 μm intervals so that the plate-like CBN was almost vertically oriented. Since the amount of CBN adhering in one pass is small, the resin was cured at 200 ° C. by passing several times to several tens of times to deposit a necessary amount of CBN of 0.1 g / cm ² . With this, plate-like CBN
(A).
As a comparison, an abrasive cloth was obtained by the same method using ordinary CBN abrasive grains ^# 30 (average particle diameter: 500 μm) (B).

Wrap these abrasive papers around the wheel, fix them,
A polishing test was performed under the following conditions.

Test conditions Abrasive cloth bundle: 1500m / min Abrasive: SKH-51 ( ^HRC 62) Abrasive feed: 2m / min Depth of cut: 100μ Method: Up-cut method From the above table, it can be said that the abrasive paper of the present invention is a sharp abrasive paper having a long life.

(Effects of the Invention) As described above, the abrasive cloth of the present invention has good cutting performance and life, and has excellent polishing performance.

[Brief description of the drawings]

FIG. 1 is a schematic view of an abrasive cloth to which plate-like cubic boron nitride is adhered, FIG. 2 is a schematic view of plate-like CBN, and FIG. 3 is a view showing slits for orienting the plate-like CBN. 1 ... substrate, 2 ... plate-shaped CBN, 2a ... main surface, 3 ... adhesive

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B24D 3/00 310

Claims (1)

(57) [Claims] An abrasive cloth comprising plate-like cubic boron nitride bonded to a substrate with an adhesive, wherein the plate-like cubic boron nitride is substantially upright with respect to the substrate, and A cubic boron nitride polishing cloth characterized in that the main surface of the cubic boron nitride is oriented parallel to the polishing direction.