JPH0818316B2 - Method for processing outer surface of β-alumina tube formed body or calcined body and polishing tool used therefor - 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 processing an outer surface of a β-alumina tube molded body or a calcined body used in a process for producing a β-alumina tube which is a solid electrolyte of a sodium-sulfur battery, and polishing used therefor. It is about ingredients.

[0002]

2. Description of the Related Art In order to manufacture a β-alumina tube which is a solid electrolyte of a sodium-sulfur battery, the surface of a β-alumina tube molded body or a calcined body in a press-molded state or a calcined state is polished. In addition, the method of baking is taken. Conventionally, a diamond wheel has been mainly used as a polishing tool for this purpose, but the one with a coarse grain size of the abrasive grain has a large scratch on the processed surface and its surface roughness is large, and β- during the firing or during use. It has a drawback that it tends to cause cracks in the alumina tube. Further, if the grain size of the abrasive grains is small, clogging is likely to occur, and it is necessary to frequently stop polishing and dress the diamond wheel, which has a disadvantage of low processing efficiency.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art and enables the surface of a β-alumina tube molded body or a calcined body to be polished to a state where the surface roughness is small, and a grindstone. The present invention has been completed in order to provide a method for processing the outer surface of a β-alumina tube molded body or a calcined body which is less likely to cause clogging and has a high processing efficiency, and a polishing tool used therefor.

[0004]

The first invention made to solve the above problems is to polish the outer surface of a β-alumina tube molded body or a calcined body with a brush roll having an organic brush portion. The gist is a method for processing the outer surface of a β-alumina tube molded body or a calcined body, which is characterized in that A second invention is characterized in that the outer surface of the β-alumina tube molded body or the calcined body is polished with an inorganic grindstone wheel such as diamond or alumina, and then with a brush roll having an organic brush portion. The gist is a method for processing the outer surface of a β-alumina tube molded body or a calcined body. Furthermore, a third invention is characterized in that an outer surface of a β-alumina tube formed body or a calcined body is formed by forming an inorganic grindstone portion such as diamond or alumina and an organic brush portion on the peripheral surface of the rotating body. The purpose of this is a polishing tool.

As described above, according to the first invention, the brush roll having the organic brush portion is used for polishing the outer surface of the β-alumina tube molded body or the calcined body. Generally, as a brush roll for surface processing, one having a metallic brush portion is used, but when such a brush roll is used, metal powder is not present on the surface of the β-alumina tube molded body or the calcined body. It is not preferable because it adheres and causes abnormal grain growth from this portion during firing to deteriorate the characteristics as a solid electrolyte. When polishing a β-alumina tube molded body or calcined body with a diamond wheel that uses finer grains than # 200, the diamond wheel is apt to be clogged and must be frequently stopped and dressed. In addition, the machining efficiency is low, and the grindstone consumes much, resulting in high cost. Further, when the formed β-alumina tube molded body or the calcined body is polished with a clogged diamond wheel, the β-alumina tube molded body or the calcined body may be damaged, resulting in poor yield. On the other hand, the organic brush is unlikely to cause abnormal grain growth and clogging due to the adhesion of metal powder, and can polish the β-alumina tube molded body or the calcined body to have a small surface roughness.
In particular, a brush roll that uses pig or horse hair for the brush portion is most suitable.

When the surface condition of the β-alumina tube molded product or the calcined product before polishing is such that a desired surface roughness can be obtained with a polishing allowance of about 50 μm or less, the surface polished by the organic brush has a surface roughness of A diamond wheel that is extremely small and has a significantly large number of machining steps to brush wear, and also shortens the polishing time required for each β-alumina tube molded body or calcined body, resulting in almost the same surface roughness. Is preferable because it has a higher processing efficiency than the case of using.

In the second invention, a brush roll having an organic brush portion and an inorganic grindstone wheel made of diamond or alumina are used in combination. In this case, an inorganic grindstone wheel such as diamond or alumina having a coarse grain size and less likely to be clogged is used, and a brush roll is used for finishing the surface processed by the diamond wheel or the like. In particular, when the surface condition of a β-alumina tube molded body or calcined body before polishing exceeds about 50 μm and the desired surface roughness can be obtained with the desired polishing allowance, a highly efficient processing surface and a polished surface with a small surface roughness can be obtained. It is preferable because it is possible. The abrasive grains of the diamond grindstone are preferably coarser than # 200.

A third aspect of the present invention relates to a polishing tool used for implementing the second aspect of the present invention, in which an inorganic grindstone portion such as diamond or alumina and an organic brush portion are formed on a peripheral surface of a rotating body. , The β-alumina tube molded body or the calcined body is continuously processed by the same polishing tool by sequentially using each part.

FIG. 1 shows an example thereof. Reference numeral 1 is a β-alumina tube molded body or calcined body which is rotated around a central axis by a holder (not shown), and 2 is a surface of a cylindrical portion thereof. For the purpose of rotation, 3 is a diamond portion formed on the peripheral surface of the rotating body 2, and 4 is a brush portion formed on the peripheral surface of the rotating body 2. The brush portion 4 is made of an organic material such as pig hair or horse hair, and has a diameter slightly larger than that of the diamond portion 3 in consideration of the bending of the bristle tips. If this polishing tool is moved to the left in the drawing while being pressed against the surface of the rotating β-alumina tube molded body or the calcined body 1, polishing by the diamond portion 3 and polishing by the brush portion 4 can be performed continuously. Can be done.

Reference numeral 5 is a rotating body for polishing the bottom of the β-alumina tube molded body or the calcined body 1. This rotating body 5
Has a two-step profile corresponding to the curved surface shape of the bottom of the β-alumina tube molded body or the calcined body 1, and a diamond portion 6 and an organic brush portion 7 are formed in each step portion. This rotating body 5 has an XY axis in a plane parallel to the plane of the drawing.
It is possible to move the bottom of the β-alumina tube molded body or the calcined body 1 with the diamond portion 6 and then finish with the organic brush portion 7 as described above. Is the same as. By using such a polishing tool of the third invention, the surface of the β-alumina tube molded body or the calcined body 1 can be continuously polished without replacing the polishing tool.

[0011]

EXAMPLES Examples of these inventions are shown below. The β-alumina tube molded body or the calcined body in each example is a bottomed cylindrical shape with an outer diameter of 31 mm, a length of 300 mm, and a thickness of 1.7 mm, and the processing device used is an NC-controlled universal grinding machine. . (Example of the First Invention) As shown in Table 1, the outer surface of a β-alumina tube molded body or a calcined body was polished using three types of brush rolls. The surface roughness was low, and the number of lines required for brush wear was large. The number of diamond wheels processed indicates the number of processed wheels until dressing is required. The time required to polish 400 β-alumina tube compacts to a surface roughness of 20 μm or less using an organic brush wheel is
The time required for polishing with 400 diamond wheels was about 1/2 to 1/5, which was extremely short.

[Table 1]

(Example of the Second Invention) As shown in Table 2, the outer surface of the calcined β-alumina tube was polished by using a diamond wheel and a brush roll having an organic brush portion together. . In this case, the surface roughness was small, the machining allowance was large, and the number of machining until clogging occurred was much larger than the case where the same conventional surface roughness was obtained by the conventional diamond wheel shown below. . With a diamond wheel rougher than # 200, a desired surface roughness cannot be obtained, and with a fine-grained diamond wheel # 400, the clogging is remarkable and the number of machining is extremely small, resulting in poor machining efficiency.

[Table 2]

[0013]

As described above, the present invention efficiently polishes the outer surface of a β-alumina tube molded body or a calcined body, which is a solid electrolyte of a sodium-sulfur battery, to a state where the surface roughness is small. Therefore, as a method for processing the outer surface of a β-alumina tube molded body or a calcined body which has solved the conventional problems and a polishing tool used for the method, it greatly contributes to industrial development.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the second and third inventions.

[Explanation of symbols]

 1 β-Alumina Tube Molded Body or Calcined Body 2 Rotating Body 3 Diamond Part 4 Organic Brush Part 5 Rotating Body 6 Diamond Part 7 Organic Brush Part

Claims (3)

[Claims] 1. An outer surface processing of a β-alumina tube molded body or a calcined body, wherein the outer surface of the β-alumina tube molded body or the calcined body is polished by a brush roll having an organic brush portion. Method. 2. A β-alumina tube molded body or a calcined body is polished on its outer surface with an inorganic grinding wheel such as diamond or alumina, and then with a brush roll having an organic brush portion. -A method for processing the outer surface of the alumina tube molded body or the calcined body. 3. An outer surface processing of a β-alumina tube molded body or a calcined body, characterized in that an inorganic grindstone portion such as diamond or alumina and an organic brush portion are formed on a peripheral surface of a rotating body. Polishing tool.