Shaping method of slight ceramic tube

Abstract

The invention discloses a slender ceramic pipe and a shaping method thereof. The slender ceramic pipe with high density and good roundness can be produced according to the shaping method. The manufacture method of bidirectional isopiestic shaping for the slender ceramic pipe comprises the steps that: briquettes disposed by vacuum refining mud and mossiness are formed and dried by a vacuum pipe extruder; a flexible internal die is arranged on the internal pore wall of the briquette; a flexible external die is sleeved on the external wall of the briquette pipe; furthermore, a flexible internal die piston and a flexible external die piston hermetically seal two ends of the briquette ; the flexible internal die piston is provided with a central through hole; the briquette shaping component is arranged in a high-pressure container to carry out the internal and external bidirectional isopiestic shaping; the finished slender ceramic pipe is then gained by demoulding, normal burning and long processing. The slender ceramic pipe provided by the invention can be widely applied to the ceramic roller in kilns or other situations which require the slender ceramic pipes.

Description

technical field [0001] The invention relates to the technical field of forming elongated ceramic tubes, in particular to a shaping method for elongated ceramic tubes. Background technique [0002] Existing molding methods of elongated ceramic tubes are as follows: [0003] (1) Grouting molding [0004] The technological process is: formula raw material - adding water ball mill - grouting slurry - hollow grouting of gypsum mold - demoulding - drying - firing - head and tail removal and fixed length processing - product. [0005] The formula raw materials are: calculated by weight percentage, alumina 20-30, corundum sand 25-35, clay 30-40. [0006] The ceramic tube formed by this method has good roundness and medium density. The disadvantage is that the strength of the ceramic tube body is poor, the thickness of the tube wall is not easy to control, and the length of the formed ceramic tube is relatively short, generally below 2 meters. The outer diameter of the tube and the...

AI Technical Summary

Problems solved by technology

[0016] (1) Since the plastic billet needs to be extruded and attached to the metal rod (tube) before unidirectional isostatic pressing, due to the high viscosity of the billet, if the plastic billet should be tightly extruded and attached to a metal rod (tube) with a length of 5-6 meters On the metal rod (tube), due to the large resistance between the slender ceramic tube body formed by the plastic blank and the metal rod (tube), it is easy to cause the slender ceramic tube body to have a small head phenomenon, that is, the ceramic tube body is in the The diameter difference between the two ends in the length direction is large

[0017] (2) Since in the one-way isostatic pressing process, the inner mold is a metal rod or tube, and the outer mold is a rubber tube, in the one-way isostatic pressing process, the hydraulic pressure applied from the outside makes the green body Pressing against the metal rod (tube) inner mold, although the tube wall is relatively dense, but because the ceramic tube body does not have fluidity, there will be a gap between the ceramic tube body and the inner mold, which is easy to press in one-way isostatic pressing. After the process is completed, an axial protruding line is formed on the surface of the finished ceramic tube, called the isobar 5-1, resulting in poor roundness of the finished ceramic tube, which seriously affects its use effect

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