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Forming method of high-precision thin-wall ceramic tube

A molding method and ceramic tube technology are applied in the field of high-precision thin-walled ceramic tube molding, which can solve the problems of low precision, difficult control of the inner wall geometry of the ceramic tube, poor straightness of the ceramic tube, etc., and achieve high production efficiency and superiority. Plasticity and fluidity, good plasticity

Inactive Publication Date: 2012-05-02
何剑明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The inner mold is made of flexible material, so although the ceramic tube after equal pressure can be easily removed from the inner mold, since the inner mold is made of a flexible rubber mold, it is difficult to control the geometric dimensions of the inner wall of the ceramic tube after forming, and the precision is not high, and the straight line of the whole ceramic tube Poor degree

Method used

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  • Forming method of high-precision thin-wall ceramic tube
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  • Forming method of high-precision thin-wall ceramic tube

Examples

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Embodiment 1

[0035] see figure 1 — image 3 As shown, the present invention manufactures high-precision thin-walled ceramic tubes by bidirectional isostatic pressing. The outer dimensions of the high-precision thin-walled ceramic tube body 5 are: length 5000 mm, inner hole diameter Ф50 mm, wall thickness 5 mm; The outer diameter of the inner mold tube 1 is Φ50mm, the wall thickness is 1mm, and the length is 5500mm.

[0036] The method steps of manufacturing this high-precision thin-walled ceramic tube are:

[0037] (1) Put the formula raw materials (calculated by weight percentage) 15-20% of alumina, 30-40% of corundum sand, and 30-40% of clay into a ball mill, add water equal to the weight of the formula raw materials, and ball mill for 2 hours , the obtained slurry is iron-removed, sieved, and press-filtered to form a mud cake, and then through vacuum mud refining, the obtained mud is stale for use;

[0038] (2) When the water content of the mud is 13-14%, add 1% methyl cellulose powd...

Embodiment 2

[0044] see figure 1 — image 3 As shown, the outer dimensions of the high-precision thin-walled ceramic tube body 5 of this embodiment are: the length is 3000 mm, the inner hole diameter is Φ20 mm, and the wall thickness is 1 mm; the outer diameter of the metal inner mold tube 1 is Ф20 mm, and the wall thickness is 0.6mm, length 3200mm. The formula mud is the same as the embodiment, the amount of methyl cellulose powder added is 2% of the weight of the mud, the water content of the mud after stale is 13%, the pressure of bidirectional isostatic pressing is 50MPa, and the pressure is held for 15 seconds. The method steps are the same as in Example 1. After two-way isostatic pressing, the diameter of the inner hole of the thin-walled ceramic tube body 5 is Ф20mm, the wall thickness is 0.8mm, and the inner wall 6 of the hole is smooth and clean, as bright as a mirror.

Embodiment 3

[0046] see Figure 4 — Image 6 As shown, the outer dimensions of the high-precision thin-walled ceramic tube blank 15 of this embodiment are: the length is 2000mm, the inner hole size is a square of 25mm×25mm, and the wall thickness is 1.5mm; the outer dimensions of the metal inner mold tube 11 are A square of 25mm×25mm, with a wall thickness of 0.5mm and a length of 2200mm. The formula mud is the same as in Example 1, the amount of methyl cellulose powder added is 3% of the weight of the mud, the water content of the mud is 14% after being stale, the two-way isostatic pressing molding pressure is 150MPa, and the holding pressure is 18 seconds. Process step is identical with embodiment 1. After two-way isostatic pressing, the inner hole of the thin-walled ceramic tube body 15 is a square with a size of 25mm×25mm, the wall thickness is 1.2mm, and the inner wall 16 of the square hole is smooth and clean, as bright as a mirror.

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Abstract

The invention discloses a forming method of high-precision thin-wall ceramic tube which can produce high-precision thin-wall ceramic tube with high density, accurate physical dimension of tube inside and external wall, and internal wall smooth as mirror. The forming method of thin-wall ceramic tube comprises steps as follows: (1) adding water to the formula material, ball milling to obtain mud material; (2) adding 1-3% methylcellulose powder into the mud material and smelting into mud bars; (3) extruding the mud bar into thin-wall ceramic tube blank and directly applying to a metal internal die tube, and drying to be pressed; (4) sleeving flexible oilproof rubber external die on external wall of the thin-wall ceramic tube blank and sealing the metal internal die tube and the rubber sleeve at two ends of the ceramic tube blank by oilproof rubber; (5) putting the ceramic tube assembly into a high pressure container, and forming by bidirectional isostatic pressing, removing the internal and external dies to obtain the high-precision thin-wall ceramic tube; (6) hoisting and sintering the high-precision thin-wall ceramic tube by conventional sintering method.

Description

technical field [0001] The invention relates to the technical field of forming thin-walled ceramic tubes, in particular to a high-precision thin-walled ceramic tube forming method. Background technique [0002] An existing thin-walled ceramic tube is formed by isostatic pressing, and its technological process is as follows: [0003] Formula raw materials—adding water and ball milling—spray granulation—squeezing tubes into metal rods or flexible rubber molds for drying—putting on rubber outer molds—medium isostatic pressure in high-pressure containers—demoulding—firing—processing—products. [0004] Formula raw materials: (weight percentage) alumina 15-20%, corundum sand 30-40%, clay 30-40%. [0005] The ceramic tube formed by this method has good density, high green body strength, small firing shrinkage, and the length of the tube can reach more than 4 meters. [0006] But this method has the following disadvantages: [0007] ① When the inner mold is made of metal rod: ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B21/52C04B35/10
CPCC04B35/6261C04B33/02C04B2235/6028C04B35/10C04B2235/94C04B2235/6021B28B21/36B28B21/52C04B2235/9638
Inventor 何锡伶
Owner 何剑明
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