JPS6246328B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an extrusion molding machine for inorganic materials.

[Background technology]

Conventionally, in an extrusion molding machine for inorganic materials, a material prepared by appropriately adding a binder, a solvent, or water to a non-plastic powder and kneading the material is supplied from the material input port 1 shown in Fig. 3, extruded forward by the primary screw 2, and then vacuumed. Extrude into chamber 3. After removing air bubbles inside the material in the vacuum chamber 3, the material is pushed into the secondary screw 5 by the material biting roll 4, and the material sent forward by the secondary screw 5 is extruded into the molding die 6 to form the desired shape. molded. At this time, if there is a surplus in the material pushed into the secondary screw 5, a force pushing it back toward the vacuum chamber 3 side is generated, which collides with the force of the material biting roll 4 trying to push it. Here, since the end surface of the material biting roll 4 is conventionally flat as shown in FIG.
The above-mentioned excess material is pushed between the material-feeding roll 4 and the wall surface 7 of the vacuum chamber 3 and remains on the end face of the material-feeding roll 4, and this retained material is degassed for a long time. becomes dry and hard,
After the wall surface 7 of the vacuum chamber 3 is worn and mixed into the material, or the material that has become dry and hardened is mixed in, the mold 6
Problems such as clogging occurred inside.

[Purpose of the invention]

The purpose of the present invention is to prevent material from stagnation between the vacuum chamber and the material feed roll to supply a stable material, eliminate clogging in the mold, and further reduce abrasion of the vacuum chamber wall surface. The purpose is to eliminate the contamination of metal powder.

[Disclosure of the invention]

Embodiment FIG. 2 is a perspective view of an embodiment of the material biting roll 4 of the present invention, in which a plurality of spiral protrusions 8 are provided radially on the end surface, and the vacuum chamber 3 and the two are connected as shown in FIG. Provided between the next screws 5. This spiral protrusion 8 is provided in order to provide a force to push out the excess material that is being forced into the space between the material biting roll 4 and the wall surface 7 of the vacuum chamber 3. The spiral protrusions 8 may be provided on both end surfaces of the material biting roll 4 or may be provided not only on the material biting roll 4 in the vacuum chamber 3 but also on the material biting roll 4.
A role that works in the same way is also effective.

Operation Make the spiral protrusion 8 an involute curve,
When the protrusion height was set to 1 mm, 5 mm, and 10 mm, a check was made after 5 hours of continuous operation. In the case of 1 mm, some dry material was attached, but in the case of 5 mm and 10
No abnormalities were observed in the case of mm. Also, similar results were obtained when the spiral protrusion 8 was made into a equiangular spiral line and the height was the same as above.

〔Effect of the invention〕

As described above, the present invention has a plurality of spiral protrusions radially provided on the end face of the material biting roll, so it is possible to prevent material from stagnation between the vacuum chamber and the material biting roll, and to supply a stable material. This eliminates the contamination of dried and hardened material, eliminating clogging in the mold, and also eliminates abrasion of the vacuum chamber wall surface, eliminating the contamination of metal powder.

[Brief explanation of the drawing]

FIG. 1 is an enlarged perspective view of a main part of an extrusion molding machine equipped with a material-biting roll of the present invention, FIG. 2 is an enlarged perspective view of a main part of a material-biting roll of the same extrusion molding machine,
FIG. 3 is a longitudinal cross-sectional view of a general extrusion molding machine, and FIG. 4 is an enlarged perspective view of the main part of the same material-biting roll. 2...Primary screw, 3...Vacuum chamber, 4...
Material biting roll, 5...Secondary screw, 6...
...Bottom mold, 8...Spiral protrusion.

Claims (1)

[Claims] 1 A primary screw that extrudes a material obtained by adding a binder, a solvent, or water to non-plastic powder, and a vacuum chamber that removes air bubbles inside the material extruded by the primary screw, and a secondary screw that extrudes the material in the vacuum chamber. In an extrusion molding machine equipped with a material biting roll that is pushed into a screw, and a secondary screw that extrudes the material pushed by the material biting roll into a molding die, a plurality of spiral protrusions are formed on the end face of the material biting roll. An extrusion molding machine characterized by being arranged radially.