RU2387537C1 - Moulding complete set for moulding equally thick big size ceramic items out of water ceramic slurry - Google Patents

Abstract

FIELD: machine building. ^ SUBSTANCE: moulding complete set for moulding equally thick big size ceramic items out of water ceramic slurry consists of moisture absorbing matrix, of perforated case, of moulding model, of core, of units for their mutual coaxial installation and feed, and of centring device. Also a centring aperture is made in a fore body of the core; the aperture is equipped with a plug with a rubber padding, while the centring device is made as a centring rod, calibrating bushing and the plug with the rubber padding. ^ EFFECT: reduced material expenditures and labour intensiveness. ^ 2 dwg

Description

The invention relates to the ceramic and aviation industries and can mainly be used when molding by slip casting of aqueous suspensions into porous forms of ceramic products such as nasal dielectric cones of aircraft.

A device is known for forming ceramic products from aqueous slips (Patent for the invention of the Russian Federation No. 2123828, 12/27/1998), containing a moisture-absorbing matrix, a forming model, a core with a support flange and a forming rod, make-up containers and a centering device made in the form of a detachable the lower part of the moisture-absorbing matrix, equipped with a body with a central hole for fixing the toe of the forming model, with a centering rod placed in the body coaxially with the central hole, with the possibility of axial movement estsheny.

The disadvantages of the known device is that when forming large-sized ceramic products (workpiece height> 1000 mm), the slurry poured falls into the body of the centering device, thereby creating a lack of recharge of the bow of the workpiece, which in turn leads to the formation of through fistulas in the bow of the workpiece .

The closest in technical essence to the claimed solution is a device for molding ceramic products from water slips (Patent for the invention of the Russian Federation No. 22232359, 20.12.2004), containing a moisture-absorbing matrix, a molding model, a perforated body, core, nodes for their mutual pine installation and make-up and centering device located in the bow and made in the form of micrometric elements with a sliding rod.

The disadvantages of the known device is that the centering device, made in the form of micrometric elements with a retractable rod, is statically fixed in the bow of the moisture-absorbing matrix. This arrangement excludes the possibility of its use in several homogeneous mold sets, which leads to an increase in material costs. In addition, as experience with a known centering device has shown, measuring the distance to the nose of the core (at several points) takes a fairly long time, which significantly increases the complexity of this operation.

The objective of the present invention is to reduce material costs and complexity when working with a centering device.

This object is achieved by the fact that the proposed kit for forming equal-thickness large-sized ceramic products from water slips containing a moisture-absorbing matrix, a perforated body, a core, nodes for their mutual coaxial installation and feeding, and a centering device, characterized in that the nose of the core is made a centering hole, which is equipped with a plug with a rubber gasket, and the centering device is made in the form of a centering rod with a calibration sleeve.

The authors experimentally established that the execution of a centering hole with a thread in the nose of the core, and the centering device in the form of a centering rod with a calibration sleeve allows to see the location of the core axis relative to the axis of the moisture-absorbing matrix when assembling the mold kit. At the same time, the monitoring of drift is ensured by a calibration sleeve.

It is established that the presence of a plug with a rubber gasket allows you to prevent the slip in the centering hole of the core and thereby avoid the marriage of the molded workpiece.

The drawings show a General view of the inventive molded kit. Figure 1 presents a diagram of the alignment of the core relative to the moisture-absorbing matrix using a centering device. Figure 2 shows a ready-to-use device with an exposed core forming the inner contour of the molded products.

The mold kit for forming equal-thickness large-sized ceramic products from water slips contains a moisture-absorbing matrix (1), a perforated body (2), a core (3), in the bow of which there is a centering hole with a thread, a centering device consisting of a centering rod (4), calibration sleeve (5) and plugs (6), with rubber gasket (7), nodes for mutual coaxial installation of the moisture-absorbing matrix and core (8), make-up nodes (9).

The operation of the device is shown in the following example:

A core (3) is inserted into the dried moisture-absorbing matrix (1), which is located in the perforated body (2) and repeats the outer contour of the product, forming the inner contour of the molded product. A centering rod (4) is screwed into the centering hole with a thread located in the bow of the core (3) (Fig. 1). In this case, the centering rod can be screwed into place before the core (3) is placed in the cavity of the moisture-absorbing matrix (1). Using the nodes of the mutual coaxial installation (8), a centering rod (4) is positioned relative to the filling hole located exactly in the center of the lower flange of the perforated body (2) so that the calibration sleeve (5) sits on the centering rod (4). This ensures the co-location of the centering rod (4) and the core (3) rigidly connected to it relative to the inner surface of the moisture-absorbing matrix (1), rigidly connected to the perforated body (2).

Before pouring the product (figure 2), the centering rod (4) is removed and a plug (6) with a rubber gasket (7) is screwed in its place, which prevents the slip from entering the centering hole. On the bottom flange of the perforated body (2), a recharge unit (9) is installed, through which the form is filled with a slip. After the preform is formed, the core (3) is removed and its recess is removed.

Due to the fact that the centering device is removed immediately before filling the slip, it can also be used on other mold sets, thereby eliminating the need to install each mold set on its own centering device, which indicates its versatility.

In addition, as shown by the use of centering devices known from the prototype and according to the proposed technical solution, in the latter case, the duration of the centering operation takes half the time.

The proposed device is extremely simple to manufacture and operate, it is especially successfully used in the molding of equally thick large-sized ceramic products from aqueous slips.

Information sources

1. Patent for the invention of the Russian Federation No. 21393928, 12/27/1998

2. Patent for the invention of the Russian Federation No. 2242359, December 20, 2004

Claims (1)

A mold kit for forming equally thick large-sized ceramic products from water slips containing a moisture-absorbing matrix, a perforated body, a forming model, a core, nodes for their mutual coaxial installation and feeding, and a centering device, characterized in that a centering hole is made in the nose of the core, which equipped with a plug with a rubber gasket, and the centering device is made in the form of a centering rod, a calibration sleeve and a plug with a rubber gasket.

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