Special coating of hot-mould centrifugal casting mould for flexible joint ferrosteel pipe

A technology of gray cast iron and centrifugal casting, which is applied to casting molding equipment, coatings, casting molds, etc. It can solve the problems of difficult cleaning of residual coatings in casting molds, rough appearance of gray cast iron pipes, and high residual strength of coatings, etc., to ensure uniformity Consistency, smooth appearance, low residual strength effect

Inactive Publication Date: 2006-05-24
张鑫
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thereby the appearance of the gray cast iron pipe produced is particularly rough, which is difficult to meet the needs of foreign markets; (2), the suspension of the coating is relatively poor, and it must be continuously stirred to ensure the uniformity and consistency of the coating in production; (3), the coating It has high residual strength, that is, the residual strength of the coating is relatively high, so that the residual coating of the casting mold is not easy to clean, which affects production, and special equipment is needed to clean the residual coating; (4), the coating has strong water absorption, when coated After the first layer is sprayed, if it is not poured for a long time, and the temperature of the mold drops, the coating will absorb a large amount of moisture in the environment, and it will need to be re-sprayed the next time it is poured.

Method used

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Embodiment Construction

[0008] The present invention includes refractory aggregate, binder, suspending agent and water. The refractory aggregates include diatomite powder, perlite powder and vermiculite powder. The binder and suspending agent include sodium bentonite and sodium carboxymethyl cellulose. The weight percentages of the above components and water are respectively diatomite powder: 3%, perlite powder: 10%, vermiculite powder: 5%, sodium bentonite: 0.5%, sodium carboxymethyl cellulose: 0.5%, water : 81%.

[0009] The preparation process is as follows: 1. First, pulping the sodium bentonite and sodium carboxymethyl cellulose in the ratio for later use. The process of making bentonite pulp is as follows: add 1 part of bentonite to 12 parts of water and stir continuously for 5 hours. Bentonite should be formulated into bentonite slurry before it can give full play to its bonding strength and suspension. The pulping process of sodium carboxymethyl cellulose is as follows: add 1 part of sodi...

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Abstract

The present invention relates to a soft joint grey cast-iron pipe hot-mould centrifugal casting special-purpose adhering moulding material. It includes fire-resisting aggregate, bonding agent, suspension agent and water. The described fire-resisting aggregate includes diatomite powder, perlite powder, vermiculite powder and silica flour, and the described bonding agent and suspension agent include sodium base bentonite and sodium cellalose glycollate. Said invention also provides its preparation method and concrete steps.

Description

(1) The technical field [0001] The invention relates to a special coating for the centrifugal casting mold of a gray cast iron pipe with a flexible interface. (2) Background technology [0002] When the flexible interface gray cast iron pipe (DN50-DN300mm×3000mm) metal mold casting mold is at 200 ~ 250 ℃, the water-based refractory coating is sprayed on the inner surface of the high-speed rotating casting mold, the water in the coating evaporates rapidly, and the rest is made of refractory aggregate main paint layer. Then, the high-temperature molten iron is poured on the coating layer on the inner surface of the high-speed rotating mold, and after the molten iron is cooled, a cast iron pipe is formed. The main disadvantages of existing coatings are as follows: [0003] (1) The coating does not have leveling properties, and the coating is prone to defects such as coating lumps and spiral lines after spraying. As a result, the appearance of the produced gray cast iron pipe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 张鑫
Owner 张鑫
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