SU1736704A1 - Apparatus for die casting ceramic pieces - Google Patents

Abstract

Use: manufacture of highly reliable instrumentation parts from ceramics, for example, parts of sensor equipment. SUMMARY OF THE INVENTION: A plant for casting ceramics under pressure comprises a base on which heated slip tanks are interconnected by a slip pipe, one of which is equipped with a stirrer, molds and the mechanism for metering the slip into molds, and the slip pipe is equipped with a valve and the slip tanks have a common vacuum pump and a source of compressed gas; the dosing mechanism is installed in one of the tanks and is designed as a feeding tube, one end of which is connected to the castings d form and the other is provided with a flange mounted thereon with a glass cut-off valve in the bottom, while the other tank is provided with a mesh-lkoy as a conical helical rigid tape, which stiffening ribs are connected to the coils of the stirrer axis. 2 Il. (Ls

Description

The invention relates to the technology for the manufacture of highly reliable ceramic instrumentation parts, in particular, to devices for hot-pouring ceramics under pressure, for example, parts of sensor equipment.

A device for hot-pouring ceramic products is known, including a thermostatically sealed working reservoir, a power supply device, a temperature controller, electric heaters, a pressure device.

The flow of the hot slip into the mold is carried out by the pressure of compressed air supplied to the working tank,

in which the vacuumed slip is placed. This device has a disadvantage - deterioration of the casting properties of the slip during its long-term stay in the working tank as a result of delamination of the slip.

A vacuum propeller stirrer is known, which consists of a thermostatically sealed vessel equipped with a blade rod and rotated by an electric motor.

The drawback of the device is the non-kneading of the slip during the evacuation to a residual pressure of 5-10 mm Hg, since at a sufficiently high viscosity and

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at a low height of the slurry column, the hydrostatic pressure does not provide the necessary influx of the slurry and its circulation under the propeller.

The closest in technical terms to the present invention is a device for hot-pouring ceramic parts, including two slip tanks with mixers, in which the slip is mixed and evacuated, and the slip is fed to the metering zone through a valve.

The disadvantages of this device lie in the fact that the technology does not allow the molding of equally dense castings with low porosity and gas saturation of the slice of the slip fed by gravity into an elastic diaphragm occurs.

The purpose of the invention is to maintain the casting properties of the preparation of the slip.

This goal is achieved by the fact that the slip line is equipped with a valve, and the slip tanks have a common vacuum pump and a source of compressed gas, while the dosing mechanism is installed in one of the tanks and is designed as a feeding tube, one end of which is connected to the injection mold, and the other one is equipped with a flange with a glass installed on it with a shut-off valve, and the other tank is equipped with an agitator in the form of a conical spiral-shaped rigid band, the turns of which are connected with stiffeners to the axis of the agitator.

Figure 1 shows the pneumatic diagram of the device; figure 2 - diagram of the device.

The installation includes a chamber 1 - a casting unit and a chamber 2 for preparing a slip 24. The chambers are interconnected by a slip line 3. The chamber 2 is equipped with an agitator 12, which is driven by an electric motor 13. A vacuum pump 11 is connected to the chamber 2 through a valve 9 and a decanter 6 The cylinder 2 is also connected to a cylinder 10 with compressed gas through a gearbox 8, a pressure gauge 7 and a valve 5. Camera 1 is connected to a vacuum pump 11 and a cylinder 10 through a valve 4. A pneumatic clamp 17 ensures that form 18 is pressed to the feed tube 16. To chamber 1 also connected vacuum pump 11 through valve 14 and slip valve 15.

The feeding tube 16 is provided with a cup, a ball, a spring, and a screw-stopper.

Chambers 1 and 2 are equipped with heaters 19, 21. Chambers 1,2 have internal walls

cone-shaped. The agitator 22 placed in the chamber 2 is made in the form of a conical helix 23, installed with a gap of 5-10 mm relative to the chamber wall.

The device works as follows.

Ceramic powder is put into chamber 2, the binder components are closed, the lid is turned on, the heaters 19, the motor 13 and the pump 11 are turned on. The stirring of the slip is performed under vacuum conditions, the turns of the agitators 23 provide the bulk mixing of the slip. This contributes to the intensification of the degassing process and the homogenization of the slip. Volumetric mixing eliminates stratification of the slip. The prepared slurry is pumped into the chamber 1, for this purpose, the valve 3 is opened, the pump 11 is turned off and 10% gas is supplied to the chamber 2 under pressure from a cylinder. After transferring the slurry into the chamber 1, the valve 3 is closed. To feed the slurry into the mold 18, the gas 1 from the cylinder 10 is supplied under pressure. filling the mold and curing the slip in the mold. The design of the dispenser provides accurate and reliable feed of the slip into the mold. The clogging of the dispenser by the particles of the slip is eliminated, since the opening of the glass is blocked by a ball.

Claims (1)

Invention Formula An installation for casting ceramics under pressure, including a base on which heated slip tanks, interconnected by a slip pipe, are placed, one of which is equipped with a mixer, casting molds and a mechanism for metering the slip into casting molds, with the aim of maintaining the casting properties of the preparation of the slip due to the reversible pumping of the slip from the tank to the tank, the slip pipe is equipped with a valve, and the slip tanks have a common vacuum pump and a source of compressed gas, while It is installed in one of the tanks and is made in the form of a feeding tube, one end of which is connected to the injection mold, and the other is equipped with a flange with a glass with a shut-off valve installed on it, and the other tank is equipped with a stirrer in the form of a conical spiral-shaped rigid tape connected to the axis of the agitator. IS 13 Jjr i five, eight + -5 2k u and J V l Fig1