JPS6251658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides a method for preparing granules mixed with a liquid, for example, from 1 to 5
This relates to a grinding wheel for grinding into ultra-fine particles on the order of microns, and is used for ink, injection fuel made of a mixture of coal or petroleum coke and C heavy oil, or ultra-hard grinding equipment used for soybean milk, soybeans, etc. Regarding grinding wheels.

[Problems to be solved by conventional technology and invention]

Conventionally, in this type of grinding wheel, there are those in which radial grinding ridges are provided at appropriate intervals on the grinding surface, etc., but when grinding granules etc. mixed with liquid, Due to the grinding ridges provided on the grinding surface, sufficient grinding was not achieved, and the quality of the product was incomplete, and it was not possible to manufacture it continuously. The present invention solves these problems.

[Means for solving problems]

The gist of the present invention is to provide a fixed grinding wheel formed by bonding a super hard grinding surface block made of zirconia ceramics to a metal stand using an epoxy adhesive for ultra-high temperatures; The grinding surface of each grinding surface block is constant on the circumference. A flat surface with a width is provided, and a truncated cone-shaped medium hollow surface is formed on the inside connected to the flat surface, and the medium hollow surface has the following grinding groove group, that is, a dividing line radial from the center c--
The radial dividing line is placed on each section g ₁ , g ₂ ... of the grinding surface equally divided _by a 1 , c-a ₂ ... on the abscissa axis.
_{X 1 , _ _ _}
A grinding groove l ₁ is provided on a straight line touching the groove l ₁ , and grinding grooves l ₂ , l ₃ . A concave groove l recessed in one section surface at the boundary of
The ends d ₁ , d ₂ of o , l _o ′... are cross-connected to the next section end groove l ₁ , and the inner ends of the grinding grooves l _{1 ,} l ₂ ... are rotated more than the outer ends. A grinding wheel made of a zirconia ceramic material for grinding granules mixed with a liquid, characterized in that the angle θ is 2 to 5 degrees and is shifted to the front of the radial direction. It exists in

[Examples and effects of the invention]

Next, details of the present invention will be explained with reference to embodiments shown in the drawings. A (Figures 1 and 2) is a so-called zirconia ceramic made by heat-treating a mixture of zirconium oxide and yttrium oxide as its main component (the manufacturing method will be explained in detail later).
This is a rotary grinding wheel having a super hard grinding surface a made of a metal base 3 which has a hole 1 for inserting a rotating shaft in the center and a recess 2 for tightening the rotating shaft. It is bonded with a high-temperature epoxy adhesive (for example, Ecobond manufactured by Emerson Cuming, etc.), and a flat surface w of a constant width is provided on the circumference, and a truncated conical shape with a hollow inside continuing from the flat surface. Section 4 is provided. The frustoconical portion 4 is provided with a group of grinding grooves b, as described below. That is, dividing lines c-a ₁ , c-a ₂ , radial from the center c...
Each section of the grindstone divided into equal parts g ₁ , g ₂ ...
, the radial dividing lines c-a ₁ , c-a ₂ . . . are set as abscissa axes, and the intersections a ₁ , a ₂ .
A grinding concave groove is formed on a straight line tangent to the small center circle r of the grinding wheel.
l ₁ is provided as a reference, and grinding grooves l ₂ ,
l ₃ ... was provided, and at the boundary of each partition surface, the ends d ₁ , d ₂ ... of the grooves l _o , l _o ′... recessed in one partition surface were cross-connected to the grooves l ₁ at the end of the next partition. It is something. The center circle r has the radial dividing line c-a ₁ as the abscissa axis X ₁ , and from the intersection a ₁ of the abscissa axis and the grinding wheel outer circumferential circle R, a straight line with an inclination θ of the ground material discharge angle θ points to the center of the grinding wheel surface. The radius is the center distance c−b ₁ of the intersection point b ₁ that intersects the ordinate axis y ₁ through which it passes. The angle θ is such that the inner ends of the grinding grooves l ₁ , l ₂ ... are shifted more forward than the outer ends in the radial direction with respect to the rotation direction, that is, the grinding material is The angle at which it is ejected varies depending on the ground material, but it is 2 to 5
The range shall be ゜.

Next, B (Figs. 3 and 4) is a fixed grindstone that is made of zirconia ceramics, which is the same material as the rotary grinding wheel A, and has a heat-treated ultrahard grinding surface a'. is bonded to a metal base 6 having a material supply hole 5 in the center with an ultra-high temperature epoxy agent, and a flat surface w' of a constant width is provided on the circumference, and a flat surface w' is provided on the inside continuously to the flat surface. A truncated conical portion 7 having a hollow shape is provided, and the truncated conical portion is provided with a grinding groove group b' having the same configuration as the grinding groove group b of the rotary grinding wheel A. shall be taken as a thing. When these rotary grinding wheel A and fixed grinding wheel B are installed, for example, in the grinding chamber 8 of a vertical grinding device D (Fig. 6), the fixed grinding wheel B is attached to its grinding surface. The upper flange-like protrusion 6' is attached and fixed to the grinding chamber upper plate 10 through the ring-shaped hook fitting 9 that engages with the upper flange-like protrusion 6' facing downward, and the rotary grinding wheel A is fixed with its grinding surface facing downward. It is assumed that it is attached to a vertical rotating shaft 11 facing upward and interlocking with a motor m below, via a plate plate 12, screws 13, etc. In addition, 14 is Hopper, 15
1 is a scraper blade, 16 is a bearing, 17 is a discharge port, and e is a boundary circle between the flat surface of both fixed rotating grindstones (Figs. 1 and 3) and a concave truncated conical portion.

In order to produce the ground surfaces a and a' of the zirconia ceramics of the present invention, the main component is zirconium oxide powder, yttrium oxide powder is added thereto, and a slurry is formed using a solvent. After putting it into a plaster mold and hardening it, and releasing it from the mold,
First fired at around 800℃ (Mohs hardness 6), corrected cutting for dimensional accuracy, concave grooves, etc., and further heated to 1800℃~2000℃.
It is sufficient to perform secondary firing at ℃ (Mohs hardness: 8.5 to 9), and then adhere it to a metal stand using an ultra-high temperature epoxy agent. Then, the slurry raw material was put into a plaster mold, and the material was simply formed into a disk shape having a truncated conical part, and the material was first fired (800°C, Mohs hardness: 6).
After that, it is of course possible to cut it into a predetermined shape, cut grooves on the ground surface, and further perform secondary firing at 1800 to 2000°C (Mohs hardness 8.5 to 9).

In this way, each section g ₁ , g ₂ . . . is provided with grinding grooves in which the inner end is inclined more forward than the outer end, and these grooves are arranged sequentially on the grinding wheel surface. When this is ground by pressing the grinding surfaces vertically against each other, as shown in Fig. 7, while the grinding wheel is rotating, the facing grooves on both sides are always connected from the base to the tip of each groove of the fixed rotating grindstone. The grooves intersect with each other in a scissor-like manner, and the sharp edges of the grooves repeat shearing and grinding, and then the flat surface on the outer periphery that is in close contact with each other allows for further grinding into fine particles. Since it rotates around the center, it takes a discharge angle that is θ degrees outward from the tangential direction, and discharges the ground material in the direction of the discharge angle, so that the movement of the ground material, that is, the feeding and delivery, is carried out smoothly. By using a relatively thin zirconia ceramic material with excellent bending stress on the grinding surface and gluing it onto a metal table, we have created a grinding wheel with outstanding strength and other performance properties at a relatively low price. Moreover, in combination with the strength of the material of the grinding surface and the flat surface of the circumference of the grinding surface, injection fuel made of ink or a mixture of coal/petroleum coke and C heavy oil, soybean milk, soybean, etc. It has the effect of being able to be ground into extremely fine particles.

[Brief explanation of the drawing]

Figure 1 is a plan view of the rotary grinding wheel, Figure 2 is the top view of the rotating grinding wheel.
- line a ₁ , b ₁ , b ₄ , a ₄ sectional view in the figure, Figure 3 is a plan view of the fixed grinding wheel, figure 4 is the - line in figure 3
a ₁ , b ₁ , b ₄ , a ₄ cross-sectional view, Figure 5 is a cross-sectional view of the grinding surfaces of a fixed grinding wheel and a rotary grinding wheel overlapping each other, and Figure 6 is a cross-sectional view of the grinding device. Fig. 7 is a cross-sectional view of the state in which both grinding wheels are attached, and is a diagram showing the overlapping state of the grooves of the fixed grinding wheel and the grooves of the rotating grinding wheel, where the solid line is the fixed grinding wheel and the dotted line is the rotating grinding wheel. Indicates a grinding stone. A... Rotating grinding wheel, B... Fixed grinding wheel, a,
a′...Grinded surface, l ₁ , l ₂ ...l _o , l _o ′...concave groove, w,
w′...flat surface, 4, 7...truncated conical portion.

Claims (1)

[Claims] 1 A fixed grinding wheel made of a super hard grinding surface block made of zirconia ceramics bonded to a metal stand using an epoxy adhesive for ultra-high temperatures; It consists of a combination of a rotary grinding wheel formed by bonding a super hard grinding surface block made of zirconia ceramics, and the grinding surface of each grinding surface block is provided with a flat surface of a constant width around the circumference. A truncated cone-shaped medium hollow surface is formed on the inside connected to the flat surface, and the following grinding groove groups are formed on the medium hollow surface, that is, dividing lines c-a ₁ , c-a ₂ radial from the center. The radial dividing lines are set as abscissa axes X ₁ , X ₂ . . . in each division plane g ₁ , g _{2 .} . . of the grinding surface equally divided _by . Intersection with outer circumference R a ₁ , a ₂ ...
A grinding groove _l1 is provided on a straight line tangent to the small center circle r of the grinding surface, and the groove is formed in the rotation direction with this as a reference.
l Grinding grooves parallel to _each other at appropriate intervals
l ₂ , l ₃ . . . are provided, _{and the} ends d ₁ ,
d ₂ is cross-connected to the next section end groove l ₁ , and the inner ends of the grinding grooves l ₁ , l ₂ ... are arranged to protrude more forward than the outer ends in the radial direction with respect to the rotational direction. 1. A grinding wheel made of zirconia ceramic material for grinding particles mixed with a liquid, characterized in that the angle θ is 2 to 5 degrees.