SU859012A2 - Method of producing casting ceramic moulds by investment patterns - Google Patents

Description

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FIELD OF THE INVENTION The invention relates to foundry production, in particular, to the production of refractory ceramic molds based on melted models.

According to the main author. St. 1 564919, a method for producing ceramic forms of melted models by electrophoresis is known, which implies that a ceramic suspension is deposited on the model block by electrophoresis, after which the precipitated layer of the suspension is sprinkled with a refractory material Petrov contact. The refractory material treated (plated) with Petrov’s contact is a wet mass, which is applied to the ceramic suspension either manually or by spraying with compressed air Ij.

However, the methods used are unproductive and unsafe. In addition, the required quality of the ceramic molds is not ensured.

The purpose of the invention is to increase labor productivity and quality of ceramic forms.

This goal is achieved by the fact that the refractory material, previously treated with Petrov’s contact, is fluidized at an air pressure of 0.3–0.4 of the specific pressure of the said fireproof material, which is then subjected to vibrations with a frequency of 300–400 Hz,

The drawing shows a diagram explaining the proposed method.

The method is carried out as follows.

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Capacity 1 with refractory material 2 filled in with it, pre-clad with a Petrov contact, is mounted on a vibrating stand 3, which provides a change in the frequency of oscillations over a wide range. The tank is equipped with gas distribution grid 4, located in the bottom.

The compressed air supply is turned on, while the air pressure changes

20 from 0 to 6 atm (the frequency and amplitude of vibrations of the shaker are zero). No fluidization of the agent is observed. Then, the pressure in the gas distribution grid is also changed from 0, while the oscillation frequency is temporarily increased simultaneously. When a pressure of 10 g / cm is reached, which is 0.4 of the specific pressure of a refractory material with a mass of 300 kg, distributed over an area of 80 W. 80 6400 CMS and vibration with an hour of 30

hota: JOO Hz, uniform fluidization is observed. A further increase in pressure up to 15 g / cm {i.e. 0.3 of the specific pressure) and the frequency of vibration of T.O. 400 Hz practically does not change the type of fluidization. Only with an increase in pressure above 15 g / cm - (40.3) a sharp disturbance of the fluidization of the fluid is observed, neither local bursts occur, and an increase in the frequency above 400 Hz increases this unevenness.

The economic effect is achieved due to the quick and uniform wetting of the ceramic mold with Petrov’s contact, which makes it possible to increase labor productivity by 1.5 times when compared with the finer method and the quality of ceramic molds by 1.2 times.

The economic effect from the introduction of the proposed method only for the manufacture of one standard size of the ceramic form will be 30.0 thousand rubles,

Claims (1)

Invention Formula A method of making casting ceramic foil l on produced models according to the author. St. No. 564919, characterized in that, in order to increase labor productivity and quality of forms, the refractory material previously processed by Petrov contact is fluidized at an air pressure of 0.3-0.4 from the specific pressure of the folded refractory material, which is subjected to vibration with an oscillation frequency of 300-400 Hz. Sources of information taken into account in the examination 0 1- USSR Author's Certificate No. 564919, cl. B 22 C 9/04, 1974. an approach SosSy G