JP2558568Y2 - Centerless grinder for dry grinding of ceramic compacts - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centerless grinder for grinding an outer periphery of a work with a grinding wheel while the work is rotatably supported by an adjusting roller and a roller blade, and more particularly to a centerless grinder for dry grinding of a ceramic formed body. Things.

[0002]

2. Description of the Related Art Conventionally, a grinding wheel is brought into contact with the outer periphery of a work in a state where the work is rotatably supported by an adjusting roller and a roller blade, instead of supporting the end of the work, so that the outer periphery of the work is reduced. A centerless grinder for grinding is, for example, a Japanese Utility Model Laid-Open No. 4-115562.
Various examples are known, as disclosed in Japanese Patent Application Laid-Open No. H10-260, the example of which is disclosed.

[0003]

With the above-described conventionally known centerless grinder, the outer periphery of a cylindrical or cylindrical workpiece can be ground with high accuracy, but the workpiece has insufficient strength, for example, When a cylindrical ceramic molded body or the like before firing is dry-ground with a centerless grinder, there has been a problem that high-precision processing and good holding properties may not be achieved.

That is, when the object of dry grinding is a cylindrical ceramic molded body, the ceramic molded body cannot be sufficiently held depending on the condition of the adjusting roller, especially the surface hardness, and the state of the roller blade, particularly the surface hardness. However, there is a problem that high-precision grinding may not be performed depending on the condition.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a centerless grinder for dry grinding of a ceramic molded body capable of achieving high-precision processing and good holding properties.

[0006]

The centerless grinder for dry grinding of a ceramic compact according to the present invention has a grinding wheel on the outer periphery of the ceramic compact while the ceramic compact is rotatably supported by adjusting rollers and roller blades. In a centerless grinder for grinding the outer periphery of the ceramic molded body by contacting the same, the hardness H1 of the surface of the adjusting roller is adjusted to ASTM D2240.
50 ° ≦ H1 ≦ 90 ° in Shore A hardness based on
The hardness H2 of the surface of the roller blade is determined by ASTM D
The hardness is set to 70 ° ≦ H2 based on Shore A hardness based on 2240 and H2 ≧ H1. In the following description, ASTM D224
Shore A hardness based on 0 is simply referred to as Shore A hardness.

[0007]

In the construction described above, the surface hardness of the adjusting roller is limited to a predetermined range, the surface hardness of the roller blade is limited to a predetermined range, and the relationship between the surface hardness of the two and the relationship is defined. Even in the case of dry grinding of the previous cylindrical ceramic molded body, the ceramic molded body can be favorably held and the outer periphery of the ceramic molded body can be processed with high precision.

In the present invention, the surface hardness H1 of the adjusting roller is limited to 50 ° ≦ H1 ≦ 90 ° in Shore A hardness because if it is less than 50 °, dry grinding with high precision cannot be performed and 90 ° This is because when the ratio exceeds the above, the ceramic molded body cannot be held. The reason why the surface hardness H2 of the roller blade is limited to 70 ° ≦ H2 in Shore A hardness is that if it is less than 70 °, high-precision dry grinding cannot be performed. Furthermore, the relationship between the two is expressed as H2 ≧
The reason for limiting to H1 is that high-precision dry grinding cannot be performed if H2 <H1.

[0009]

FIG. 1 is a view showing the structure of a main part of an example of a centerless grinder for dry grinding of a ceramic molded body according to the present invention, and other structures are the same as those of a conventionally known centerless grinder. I am taking. In the example shown in FIG. 1, 1 is an adjusting roller, 2 is a roller blade, 3 is a work for processing, 4 is a grinding wheel, 5 is a pressing roller, and 6 is a rotating brush. By forcibly rotating in the direction and co-rotating in the direction of the dotted arrow, the outer periphery of the work 3 can be dry-ground by the grinding wheel 4.

A feature of the present invention is that when the cylindrical ceramic molded body before firing is dry-processed as the work 3, the hardness H1 of the adjusting roller 1 is set to 50 ° ≦ H1 in Shore A hardness.
≦ 90 °, and the hardness H2 of the roller blade 3 is set to 70 ° ≦ H2 ≦ 100 ° in Shore A hardness.
2 ≧ H1. In order to achieve the above-mentioned surface hardness, it is easy to apply a rubber-based material to the surface of the normal adjusting roller 1 and to apply a rubber-based or resin-based material to the normal roller blade 2. It is preferable because the surface hardness described above can be achieved.

Hereinafter, an actual example will be described. EXAMPLES Actually, a bottomed cylinder having an outer diameter of 50 mm, a length of 500 mm, and a thickness of 2 mm is used as a solid electrolyte for a sodium-sulfur battery after firing by using a centerless grinder having the configuration shown in FIG. When performing a dry infeed process on the β-alumina molded body before firing the shape,
High-precision processing could be performed while maintaining good holding properties. The configuration of each part of the apparatus was as follows.

Adjustment roller 1: Material: Natural rubber coating (coating thickness: 14 mm): Hardness: 70 ° (Shore A hardness): Rotation speed: 20 rpm (outer diameter: 300 mm) Roller blade 2: Material: Urethane rubber coating (coating) Thickness: 5 mm): Hardness: 95 ° (Shore A hardness): Rotation speed: 200 rpm (outer diameter: 30 mm) Grinding wheel 4: Diamond whetstone: Rotation speed: 1500 rpm (outer diameter: 550 mm) Pressing roller 5: Material: natural rubber Coating (Coating thickness: 2 mm): Hardness: 50 ° (Shore A hardness): Co-rotating with the work Rotary brush 6: For cleaning roller blades: Rotating speed: 200 rpm

[0013]

As is clear from the above description, according to the present invention, the surface hardness of the adjusting roller is limited to a predetermined range, the surface hardness of the roller blade is limited to a predetermined range, and the surface hardness of both rollers is further reduced. Due to the synergistic effect of defining the relationship between the hardness, even when dry-grinding the cylindrical ceramic molded body before firing, the ceramic molded body can be held well and the outer periphery of the ceramic molded body is processed with high precision. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of an example of a centerless grinder for dry grinding of a ceramic molded body of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adjusting roller 2 Roller blade 3 Work 4 Grinding grindstone 5 Holding roller 6 Rotary brush

Claims (1)

(57) [Scope of request for utility model registration] 1. A centerless grinder for grinding an outer periphery of a ceramic molded body by bringing a grinding wheel into contact with an outer periphery of the ceramic molded body in a state where the ceramic molded body is rotatably supported by an adjusting roller and a roller blade. The hardness H1 of the surface of the adjusting roller is A
50 ° ≦ Shore A hardness based on STM D2240
H1 ≦ 90 °, and the hardness H2 of the roller blade surface is 70 ° ≦ H2 in Shore A hardness based on ASTM D2240, and H2 ≧ H1. Res grinder.