JPS637264A - Manufacture of ceramics parts - Google Patents

Abstract

PURPOSE:To effectively manufacture parts made of ceramics by entering ceramics sintered body in a vessel containing a polishing liquid, grinding particles and media, and by giving them movement. CONSTITUTION:Materials 1 made of ceramics sintered body are combinedly machined. After the corners of the materials 1 are made to be round, they are finish-machined. When a plurality of materials 1 are entered in a vessel 2 together with grinding particles and media 3 and a polishing liquid 4, and when the vessel 2 is rotated, the materials 1 in the vessel 2 are stirred with the particles and media 3 and the polishing liquid 4. Then, as the materials 1 strike against the particles and media 3, unevenness on the surface of the materials 1 is eliminated, and polishing thereon is thus carried out. The materials are also fully brought into contact with the grinding liquid 4, and the surfaces which are still uneven are corroded and melted, namely subjected to etching, by the liquid 4 to have smooth surfaces. It is thus possible to effectively remove the corners of materials 1 to form them in spherical shapes and finish-machine the surfaces of the materials 1 smoothly according to the simultaneous works of the grinding of grinding particles and media 3 and the chemical treatment of the grinding liquid 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing ceramic parts in which a ceramic sintered body is polished.

[Prior Art] Ceramics have been widely used in various fields such as machine parts in recent years because of their excellent mechanical strength and high-temperature strength.

Conventionally, when manufacturing parts made of ceramics, a method has often been adopted in which a material made of a sintered ceramic body is prepared, and this material is subjected to grinding processing to produce individual parts one by one. .

For example, by taking advantage of the high-temperature strength of ceramics, ceramics are used to form spheres used in ball bearings that support rotating bodies that rotate under high temperatures.

Conventionally, the method for manufacturing spheres made of ceramics is to prepare a rod-shaped material made of sintered ceramics, grind a part of this material to form each sphere, and then separate it from the material and make it into a sphere. A molding method is used.

[Problems to be Solved by the Invention] However, in the conventional manufacturing method of ceramic parts described above, parts are cut out one by one from the raw material by grinding, which requires time and effort. The problem is that it is inefficient.

For example, in the conventional method for manufacturing ceramic spheres, each sphere is processed into a spherical shape one by one from a rod-shaped ceramic sintered body and separated, which requires time and effort and has low processing efficiency. There is a problem.

The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing ceramic parts that is highly mass-producible and can efficiently obtain parts made of ceramic.

[Means and effects for solving the problems] In order to solve the above problems, the method for manufacturing ceramic parts of the present invention includes:
A ceramic sintered body is placed in a container containing a polishing liquid, abrasive grains, and media, and the ceramic sintered body is polished by giving motion to the ceramic sintered body, polishing liquid, abrasive grains, and media. This is a characteristic feature.

[Example code] Examples of the manufacturing method of the present invention will be described below.

An embodiment in which the present invention is applied to manufacturing a sphere will be described with reference to FIGS. 1 to 3. Note that in this embodiment, a horizontal rotating container is used. This embodiment is particularly suitable for finishing with little surface roughness.

First, as shown in FIG. 3(,), a large number of cube-shaped materials 1 made of a sintered body of ceramic or clay that is dense and homogeneous throughout are prepared. The ceramics used include silicon nitride, sialon, aluminum nitride, zirconia, and alumina, which have excellent high-temperature strength. The ceramic sintered body forming the raw material is preferably obtained by hot pressing in order to have high density. Among these, hot-pressed silicon nitride heat exchangers have excellent strength and toughness.

The raw material 1 is formed by cutting out square bars from a pressure-sintered ceramic sintered plate and sequentially cutting the square bars into cube shapes.

Next, the corners are rounded by rough machining (barrel machining, etc.), and then finishing machining is performed. That is, as shown in FIGS. 1 and 2, a large number of materials 1 are placed in a container 2 together with abrasive grains, media 3, and polishing liquid 4, and the container 2 is rotated to polish the materials 1 into a spherical shape. As a result, a sphere 1' shown in Fig. 3 is obtained. The container 2' has, for example, a cylindrical shape with both ends closed, and has shafts 2a at both ends. Further, the container 2 is provided along the horizontal direction, is rotatably supported by a bearing (not shown) via a shaft 2a, and is rotated by a rotational drive device (not shown). . The abrasive grains and media 3 are used to perform abrasive processing, that is, mechanical polishing, on the material 1, and abrasive grains, stone blocks, quartz, sand, etc. are used depending on the degree of finishing. The polishing liquid 4 is for chemically polishing the material 1 by processing, etching, or corroding and dissolving it.
Use an etching solution of about 9 to 11 (P) such as NaOH solution or KOH solution.The ratio of the contents in the container 2 is the volume ratio, for example, the ratio of material 2:abrasive grains and media 6:polishing liquid 2. It is.

When the container 2 is rotated by the rotary drive device, the abrasive grains, media 3, and polishing liquid 4 in the material 1 placed in the container 2 are agitated. That is, the deposited layer of the material 1, abrasive grains, and media 3 in the container 2 is pulled up and moved in the rotational direction as the container 2 rotates, and when it moves to a certain height, the surface of the deposited layer completely falls off. Mix with the lower part of the sedimentary layer. Stirring is performed by repeating this process. As a result of this stirring, the material 1 collides with the abrasive grains and the media 3, and the irregularities on the surface of the material 1 are removed by the abrasive grains and the media 3, thereby making the surface smooth. That is, the material 1 is polished. Furthermore, by stirring, the material 1 is sufficiently fused with the polishing liquid 4, and the unevenness on its surface is corroded and dissolved by the polishing liquid 4, and the surface is smoothed. That is, the material 1 is subjected to an etching process. In particular, this etching process is very effective in leveling out the irregularities on the surface of the material 1 and making the surface smooth. In this way, in order to perform both the polishing process using the abrasive grains and media 3 and the chemical polishing using the polishing liquid 4, the corners of the material 1 can be efficiently removed and the material 1 can be formed into a spherical shape. By finishing the surface efficiently and smoothly, the material 1 can be formed into a spherical body 1' having a smooth spherical surface as shown in FIG. 3(b). That is, a large number of raw materials 1 placed in the container 2 can be processed all at once into a spherical body 1' having a smooth spherical surface.

After polishing is completed, the 10 revolutions of the container are stopped and a number of spherical materials 1, ie, spheres 1' are taken out from the container 1.

Next, a fourth example in which an electrolytic solution is used as the polishing solution will be described.
The diagram will be explained. In addition, in FIG. 4, the same parts as in FIG. 1 are given the same reference numerals. In this embodiment, both ends of the container 2 are connected to a DC power source E.

Then, in container 2, material 1, abrasive grains, and media 3 are placed.
Add polishing liquid 4, which is an electrolytic solution, together with the polishing liquid 4.

As the electrolytic solution, a sodium hydroxide solution, a potassium hydroxide solution, or the like having a hydroxyl group (-OH) is used. During polishing, the container '1 is rotated to rotate the material 1 together with the abrasive grains and media 3 to perform the polishing process. At the same time, when electricity is supplied to the container 1 from the DC power source E, a resonance effect occurs due to the high frequency power, the surface layer becomes conductive, and electrolysis and discharge phenomena occur.

Therefore, it is possible to perform both polishing and electrolytic polishing on the material 1 at the same time, thereby efficiently forming the spherical body 1' having a smooth spherical surface.

In each of the above-described embodiments, by providing the protruding strips 5 inside the horizontal container 2, the momentum of the material 1, abrasive grains, and media 3 during rotation of the container 2 is increased, making the polishing process more efficient. can be made to do so. That is, the protruding strip 5 has a cross-sectional shape as shown in FIG. 5, is provided along the axial direction of the container 2, and rotates integrally with the container 2. Then, when the container 2 is rotated as shown in FIG. Therefore, the timing at which the material 1, abrasive grains, and media 3 fall from the top to the bottom of the container 2 is delayed compared to the case where the protrusions 5 are not provided, and the material 1, abrasive grains, and media 3 fall by the amount of the delay. The amount of momentum when the media 3 slides down increases. Therefore, the degree to which the material 1 collides with the abrasive grains and the media 3 increases. In addition, the material inside the container,
It also has the effect of greatly stirring the media and abrasive grains. This improves the efficiency of the polishing knife Loe on the material 1.

Next, an example in which a sphere is manufactured using a vertical rotating container will be described with reference to FIG. This embodiment is particularly suitable for rough finishing.

The container 6 used in this embodiment has a cylindrical shape with an open top surface, and is arranged vertically so as to be freely rotatable, and is rotated by a rotation and drive device (not shown). It has become.

A lid 7 is placed on the open top of the container 6. This lid 7
A shaft 8 provided in the container 6 is inserted through the container 6, and is held by a height adjusting coil spring 9 and a nut 10 screwed onto the shaft 8. In addition, a grindstone 11.1 is applied to the entire lower surface and the entire inner peripheral surface of the container 6, respectively.
2 is provided, and a grindstone 13 is further provided on the entire inner surface of the lid 7. These grindstones 11 to 13 are used as abrasive grains for grinding the material, and for example, a diamond grindstone is used.

When processing is to be carried out, the material 1 is placed into a container 6 together with a polishing tool 4. As the polishing liquid 4, for example, an etching liquid is used. When container 1 is rotated, container 6
The material 1 placed in the container jumps and hits the grindstone 11.1 in the container 6.
2 and the grindstone 13 of the lid 7, the material 1 is ground. In this case, the grindstones 11 to 11 are attached to the container 6 and the lid 1, respectively.
13, grinding can be carried out efficiently. Further, the material 1 is etched by coming into contact with a polishing liquid 4 (etching liquid) placed in a container 6. Therefore, material 1
can be efficiently processed into spheres.

FIGS. 7 and 8 show an example in which a sphere is formed using a device that combines a vertical container and a stirring impeller. In the figure, reference numeral 14 denotes a container having the same shape as the container 6, and grindstones 15 and 16 are provided on the lower surface and inner peripheral surface of the container. This container 14 is fixedly provided. An impeller 17 is provided concentrically inside the container 14. This impeller 17 has a plurality of blades 2 on a rotating shaft 19 rotated by a motor 18.
0 are attached radially. Note that a plurality of baffle plates 2 are provided on the inner peripheral surface of the container 14 at intervals in the circumferential direction.
Install 1.

When processing is to be carried out, the material 1 and polishing liquid 4 are placed in a container 14. As the polishing liquid 4, for example, an etching liquid is used. Then, the impeller 1 is driven by the motor 18.
When 7 is rotated, the material 1 and polishing liquid 4 in the container 14 are
is stirred while flowing along the circumferential direction of the container 14.

As a result, the material 1 collides with the grindstone 14, 15 of the container 14 and is ground, and at the same time, the material 1 is corroded and dissolved by the polishing liquid 4. Therefore, the material 1 can be efficiently processed into a sphere.

In each of the embodiments shown in FIGS. 6, 7, and 8, an electrolytic solution is used as the polishing solution 4 instead of the etching solution, and a direct current is applied to the container 6° 14 during polishing. As a result, a discharge phenomenon occurs in the material 1. This phenomenon prevents the grindstone from becoming clogged and also promotes the polishing action. In addition, in each of these examples, the container 6.14
The polishing may be performed by placing abrasive grains and media 3 together with the material 1 in the holder.

After the rough finishing using the vertical rotating container, finishing processing using the horizontal rotating container is performed, it is possible to obtain a ceramic component with a smoother surface.

Furthermore, the manufacturing method of the present invention is not limited to processing a ceramic sintered body into a spherical shape, but can be widely applied to the case of polishing a ceramic sintered body when manufacturing a part made of a ceramic sintered body. .

[Effects of the Invention] As explained above, according to the method for manufacturing ceramic parts of the present invention, by simultaneously performing both mechanical polishing and chemical polishing on the material, it is possible to sinter ceramics with a smooth surface. It is possible to efficiently manufacture a large number of body parts.

[Brief explanation of the drawing]

1 to 3 show an embodiment of the manufacturing method of the present invention, FIGS. 1 and 2 are longitudinal and transverse sectional views showing a container used in the embodiment, and FIG. 3(a) is a perspective view showing the material, FIG. 3(b) is a perspective view showing a sphere, FIG. 4 is a vertical cross-sectional view of a container used in another example, and FIGS.
, ) is an explanatory diagram showing the movement of the material, abrasive grains, and media due to the rotation of the container used in each of the above embodiments, FIG. 6 is a sectional view of the container used in another different embodiment, and FIGS. 7 and 8 are FIG. 7 is a cross-sectional view and a plan view showing a container used in yet another example. 1... Material, 1'... Sphere, 2, 6.14... Container, 3... Abrasive grains and media, 4... Polishing liquid. Applicant's representative Patent attorney Takehiko Suzue Figure 1 Figure 2 (a) (b) Figure 3 Figure 4 Figure 7 Figure 8

Claims (6)

[Claims] (1) A ceramic sintered body is placed in a container containing a polishing solution, abrasive grains, and media, and the ceramic sintered body is polished by giving motion to the ceramic sintered body, polishing solution, abrasive grains, and media. A method for manufacturing ceramic parts, characterized by: (2) The method for manufacturing ceramic parts according to claim 1, wherein the polishing solution is for chemical polishing. (3) The method for manufacturing ceramic parts according to claim 1, wherein the polishing solution is for electrolytic polishing. (4) The method for manufacturing a ceramic component according to any one of claims 1 to 3, wherein the abrasive grains and media are mixed into a polishing solution. (5) The method for manufacturing a ceramic component according to any one of claims 1 to 3, wherein the abrasive grains and the media are a grindstone provided in a container. (6) The method for manufacturing a ceramic component according to any one of claims 1 to 5, wherein the container is a rotating body.