RU2257291C1 - Device for molding ceramic articles of complex configuration from aqueous slips - Google Patents

Abstract

FIELD: molding large-sized ceramic articles of complex configuration from aqueous slips.

SUBSTANCE: proposed device includes moisture-absorbing matrix, core and mounting and makeup units. Device is provided with additional unit for check of assembly which includes measuring rule, float fitted in makeup unit and two contacts: one contact is fixed on measuring rule and second contact is fitted on float. Device is also provided with indicating unit.

EFFECT: reduction of rejects.

1 dwg

Description

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

A device for casting hollow ceramic products is known, which according to the USSR author's certificate No. 1570900, MKI B 28 V 1/26 contains a moisture-absorbing form (matrix), a core in the form of an elastic shell, a mechanism for deforming the elastic shell and providing recharge.

The disadvantages of the known device include the fact that the core, made in the form of an elastic shell, is not a structural element forming the inner contour of the manufactured product. In this case, obtaining products with the same wall thickness in all sections is based on the assumption that the set of product wall thickness is uniform over the entire surface, which is not true, since a number of factors are involved in the process of forming the product wall, 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. It is not possible to establish the moment of the final filling of the mold cavity with the solid phase, therefore, as a result of shrinkage of the workpiece on the core, its destruction occurs.

A device is also known for forming ceramic products from aqueous slips (patent for the invention of the Russian Federation No. 2191688, 28 V 1/26, 2000), including a moisture-absorbing matrix, a 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 during molding. 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 this device, as in the previous solution, is the inability to determine the moment of the final set of blanks, which is the reason for the blanks to be rejected.

The closest in technical essence to the claimed solution is a device for molding ceramic products from water slips (TP 596.01000.1164, FSUE ONPP Технология Technology ’, Obninsk, 2002), including a moisture-absorbing matrix, core, nodes for their mutual coaxial installation and recharge and a metal rod, which through the recharge nodes by probing determine the degree of set of the workpiece.

The disadvantage of this device is that in cases of incomplete collection of the workpiece, the immersion of the metal rod causes the suspension to structure in the mold cavity, which leads to the formation of material density in these places, the appearance of microcracks in the workpiece and its rejection at the stage of molding and firing.

The technologists faced the task of reducing defects in the molding of large-sized complex ceramic products.

The problem is solved using the proposed device for molding complex ceramic products from aqueous slips containing a moisture-absorbing matrix, a core, nodes for their mutual coaxial installation and recharge, characterized in that the device is equipped with an additional control unit for the workpiece set containing a measuring ruler, a float installed in the feed node, two contacts, one of which is stationary mounted on the measuring ruler, and the second on the float, and an alarm unit.

The authors experimentally established that the presence of the proposed additional control unit for the set of preforms in the device for molding complex ceramic products allows you to determine the time of the final set of preforms and remove the core from the mold cavity, which in turn leads to a reduction in marriage in the molding operation. High accuracy is due to the fact that the reduction in the volume of the slip in the mold cavity during the molding of the workpiece depends only on the parameters of the slip and the specific volume of the slip needed to fill the mold, which is constant for each particular product.

The drawing shows a General view of the claimed device.

The design of the device includes a moisture-absorbing matrix 1, a core 2, nodes for their mutual coaxial installation 3 and recharge nodes 4, a control unit for a set of workpieces containing a measuring line 5, stationary contact 6, movable contact 7, float 8 and signaling unit 9.

The device operates as follows. The core 2 is installed in the matrix 1 and fixed using the nodes of the mutual coaxial installation of the matrix and the core 3. A control unit for the set of blanks is installed on one of the make-up nodes 4. The space between the matrix 1 and the core 2, as well as the recharge nodes 4 are filled with a slip. On the measuring line 5, the stationary contact 6 is set to the amount of the slip volume decrease in the make-up nodes relative to the movable contact 7, which is rigidly connected to the float 8 located in the make-up node 4. In the process of blank preparation, the contact 7 lowers and eventually closes the fixed contact 6, including while the alarm unit 9, indicating the moment of completion of the process of recruitment of ceramic billets.

The device is extremely simple to manufacture and operate, it is especially successfully used in the formation of large-sized complex-profile ceramic products from aqueous slips.

The use of the proposed additional control unit for the set of preforms in the device for molding complex ceramic products makes it possible to determine with a sufficient degree of accuracy the moment of the final set of preforms and significantly reduce the defect during molding of these products by slip casting from aqueous slip into porous gypsum molds and, if necessary, trace the kinetics set of blanks during molding.

Sources of information

1. USSR copyright certificate No. 1570900, MKI B 28 V 1/26.

2. Patent for the invention of the Russian Federation No. 2191688, 28 V 1 / 26,2000,

3. TP 596.01000.1164, FSUE ONPP ″ Technology ″, Obninsk, 2002

Claims (1)

A device for forming complex-profile ceramic products from water slips containing a moisture-absorbing matrix, a core, nodes for their mutual coaxial installation and make-up, characterized in that the device is equipped with an additional control unit for the workpiece set containing a measuring line, a float installed in the make-up unit, two contact, moreover, one of them is stationary mounted on the measuring ruler, and the second on the float, and the alarm unit.