RU2248271C1 - Device for molding of intricate profile ceramic items out of water slips - Google Patents

Abstract

FIELD: devices for molding of intricate profile ceramic items.

SUBSTANCE: the invention is dealt with technologies of molding of large-sized intricate profile ceramic items out of water slips. The technical result is improvement of quality of ceramic items. The device contains a moisture absorbing die, a core, setting units for their mutual coaxial setting and makeup. The core has a central vertical through hole shut down by a rod.

EFFECT: the invention ensures improvement of quality of ceramic items.

1 dwg

Description

The invention relates to a technology for forming large-sized, complex-profile ceramic products from aqueous slips.

A large number of information sources are known that describe various devices of molded kits for the manufacture of ceramic products by casting from aqueous slips. However, all known solutions are aimed at improving devices to reduce the thickness variation of the resulting products, considering that this technical effect improves their quality.

So in the patent for the invention of the Russian Federation No. 2139828, 28 V 1/26 describes a device for molding ceramic products from aqueous slips, including a moisture-absorbing matrix, a molding model, a core with a support flange and a forming core, make-up containers, in which the matrix is made detachable in the lower parts and is equipped with a housing with a central hole fixing the toe of the model, while the centering rod with axial movement is placed coaxially with the central hole in the housing.

The disadvantage of this device is that the principle of its operation is based on the idea that the set of wall thickness of the product is uniform over the entire surface, which is not true, since a number of factors are involved in the process of forming the wall of the product, which lead to the gradual filling of the cavity forms solid sediment from its lower to upper. In this case, the suction of moisture in the form from the collected shard continues further, as a result of which the resulting workpiece is dried, accompanied by its shrinkage. As a result of shrinkage of the workpiece on a rigid core, its destruction occurs. Considering these technological aspects of casting products from water slips, it becomes obvious that technical solutions for producing equally thick blanks do not ensure the integrity of the products, which is observed in practice.

The closest in technical essence to the claimed solution is a device for molding ceramic products from water slips (patent for invention of the Russian Federation No. 2191688, 28 1/26, 2000. Device for forming ceramic products from water slips), including a moisture-absorbing matrix, core , nodes for their mutual coaxial installation and recharge, the outer surface of the core has a coating made of easily deformable hydrophobic material that compensates for the shrinkage stress of the product as it is dried in the mold Vania. The coating can be removable or stationary. The named set of features of the device allows to obtain high-quality products with a given inner contour from aqueous slips.

The disadvantage of the proposed device is that its effective use is possible only when molding products having a conical shape, while when forming cylindrical products and products having a small angle of inclination of the wall (similar to the product shown in figure 1), at the time of extraction core, in the cavity of the product under the core there is a rarefaction of air, which contributes to the nucleation of internal cracks in the still fragile body of the product.

The aim of the invention is to improve the quality of the molding of large-sized, complex-profile ceramic products by slip casting from aqueous slip into porous gypsum molds.

The goal is achieved by the fact that the proposed device for forming complex ceramic products from water slips containing a moisture-absorbing matrix, a core, nodes for their mutual coaxial installation and recharge, characterized in that the core has a central, vertical, through hole, locked by a rod.

The authors experimentally established that during the formation of cylindrical products and products having a small angle of inclination of the wall, at the time of extraction of the core, rarefaction of air occurs in the cavity of the product under the core, which contributes to the generation of internal cracks in the still fragile body of the product. Crack nucleation can be avoided by ensuring the elimination of rarefaction of air in the cavity of the product under the core by making a central, vertical, through hole in the core, which is locked by the rod at the time of formation of the product.

The above diagram (see drawing) shows a general view of the claimed device with an installed core that forms the inner contour of the molded products. The design of the device includes a moisture-absorbing matrix 1, a core 2, in which a central, vertical, through hole is made, with the rod 3 inserted into it, nodes for their mutual coaxial installation 4 and recharge nodes 5.

The device operates as follows. A core 2 is installed in the matrix 1, into which the stem 3 is screwed. The core is installed using the nodes of the mutual coaxial installation of the matrix and core 4. Through the feed nodes, the form is filled with a slip. After the product is formed, the stem 3 is removed from the core 2, after which the core is removed, the rarefaction of air in the cavity of the product under the core is eliminated due to the central, vertical, through hole made in it, which in turn leads to the elimination of internal cracks in the still fragile body of the product.

The device is extremely simple to manufacture and operate, it is especially successfully used in the formation of cylindrical products and products having a small angle of inclination of the wall.

Using the proposed device can improve the quality and eliminates the marriage when forming large-sized, complex-profile ceramic products by slip casting from aqueous slip into porous gypsum molds.

Sourse of information.

1. Patent for the invention of the Russian Federation No. 21393928, 28 V 1/26, 1997 Device for molding ceramic products from aqueous slips.

2. Patent for the invention of the Russian Federation No. 2191688, 28 V 1/26, 2000 Device for molding ceramic products from aqueous slips.

Claims (1)

A device for forming complex-profile ceramic products from aqueous slips containing a moisture-absorbing matrix, a core, units for their mutual coaxial installation and feeding, characterized in that the core has a central, vertical, through hole, locked by a rod.