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Precoated sand for hydraulic part and preparation method thereof

A technology of coated sand and hydraulic parts, which is applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of performance degradation, increased gas production of coated sand, etc., and achieve the effect of simple preparation method

Pending Publication Date: 2022-04-12
天阳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among many casting defects, the amount of gas produced by coated sand directly affects the production yield. In the conventional process of making coated sand, to meet the characteristics of core making such as runner cores and other small sizes and complex shapes, it is often necessary to increase The method of resin improves the strength of the sand core and prevents damage during handling. However, as the phenolic resin increases, the gas generation of the coated sand also increases, resulting in a decrease in performance

Method used

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  • Precoated sand for hydraulic part and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] S1, configure raw materials according to the following parts by mass: 500 parts of aeolian sand, 10 parts of zinc oxide modified phenolic resin, 4 parts of urotropine solution with a concentration of 32%, 1 part of calcium stearate; The diameter distribution is: 35% for 50 mesh, 45% for 70 mesh, and 20% for 100 mesh; the aeolian sand is obtained by scrubbing and selecting the aeolian sand in Inner Mongolia, and roasting at a high temperature of 880°C.

[0020] S2. Heat the aeolian sand after calcine selection at 135°C for 3 minutes, then put it into a mixer for uniform mixing for 20 seconds, then add zinc oxide modified phenolic resin and continue stirring for 45 seconds to form a mixture;

[0021] S3, add the urotropine solution of concentration 32% in the mixture and stir, adjust the kneader current maximum value 130A, drop into calcium stearate and stir for 25s, finally through crushing and sub-sieving, cooling to obtain the average particle diameter of 0.2mm Coated ...

Embodiment 2

[0023] S1, configure raw materials according to the following parts by mass: 400 parts of aeolian sand, 5 parts of zinc oxide modified phenolic resin, 2 parts of urotropine solution with a concentration of 32%, 0.5 part of calcium stearate; The diameter distribution is: 45 mesh 35%, 65 mesh 45%, 90 mesh 20%. The aeolian sand is obtained by scrubbing and selecting the aeolian sand in Inner Mongolia, and roasting at a high temperature of 870°C.

[0024] S2. Heat the aeolian sand after calcine selection at 130°C for 3 minutes, then put it into a mixer for uniform mixing for 20 seconds, then add zinc oxide modified phenolic resin and continue stirring for 45 seconds to form a mixture;

[0025] S3, add the urotropine solution of concentration 30% in the mixture and stir, adjust the kneader current maximum value 130A, drop into calcium stearate and stir for 25s, finally through crushing and screening, cooling to obtain the average particle diameter of 0.2mm Coated sand.

Embodiment 3

[0027] S1, configure raw materials according to the following parts by mass: 500 parts of aeolian sand, 15 parts of zinc oxide modified phenolic resin, 5 parts of urotropine solution with a concentration of 32%, 2 parts of calcium stearate; The diameter distribution is: 55 mesh 35%, 75 mesh 45%, 120 mesh 20%. The aeolian sand is obtained by scrubbing and selecting the aeolian sand in Inner Mongolia, and roasting at a high temperature of 880°C.

[0028] S2. Heat the aeolian sand after calcine selection at 140°C for 20 hours, then put it into a mixer for uniform mixing for 20 seconds, then add zinc oxide modified phenolic resin and continue stirring for 45 seconds to form a mixture;

[0029] S3, add the urotropine solution of concentration 35% in the mixture and stir, adjust the kneader current maximum value 130A, drop into calcium stearate and stir for 25s, finally through crushing and screening, cooling to obtain the average particle size of 0.2mm Coated sand.

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Abstract

The invention belongs to the technical field of rare earth turbine casting, and relates to precoated sand for a hydraulic part and a preparation method of the precoated sand. The eolian sand is heated, and the zinc oxide modified phenolic resin and the urotropine solution with the concentration of 30-35% are matched, so that the precoated sand has the characteristics of fast curing, high melting point and low gas generation, and the whole preparation method is simple and suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of rare earth turbine casting, and relates to coated sand for hydraulic parts and a preparation method thereof. Background technique [0002] At present, the production scale of hydraulic castings in my country basically presents the characteristics of small batches and multiple varieties. The use of coated sand is only used as the core part, and the coated sand is required to have high strength, low gas generation, high collapse, and suitable temperature resistance. Among many casting defects, the amount of gas produced by coated sand directly affects the production yield. In the conventional process of making coated sand, to meet the characteristics of core making such as runner cores and other small sizes and complex shapes, it is often necessary to increase The method of resin improves the strength of the sand core and prevents damage during handling. However, as the phenolic resin increases, the gas gen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22B22C1/10B22C5/00B22C5/04
Inventor 雷文港张显旺郭亚彪
Owner 天阳新材料科技有限公司
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