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High-temperature resisting precoated sand for casting

A technology of coated sand and high temperature resistance, applied in the field of coated sand, can solve the problems of unfavorable wide application, high preparation cost, limited application range, etc., to prevent molten iron from penetrating into the sand core, slow down the decomposition speed, and reduce the manufacturing cost Effect

Inactive Publication Date: 2018-06-08
LIUZHOU LIUJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese invention patent with the publication number CN105537503A discloses a kind of anti-sticking sand coated sand for turbine shell casting, which uses silica sand, binder, curing agent, coupling agent and ferroferric oxide as raw materials. Ferric oxide is added to the sand raw material to solve the problem of sand sticking in castings, but the coated sand prepared by this method is mainly used to prepare high-nickel cast iron turbine shells, the application range is limited, and iron sand needs to be added, and the preparation cost is high. Not conducive to wide application

Method used

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  • High-temperature resisting precoated sand for casting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high-temperature-resistant coated sand for casting, which is prepared from the following raw materials in parts by weight: 98 parts of raw sand, 2 parts of phenolic resin, 0.35 part of urotropine, 0.2 part of calcium stearate, and 0.3 part of hollow ceramic microspheres .

[0018] The high temperature resistant coated sand of this example is prepared by the following steps: (1) preheat the raw sand to 105°C, add it into the sand mixer, and control the speed of the sand mixer to 250r / min; (2) add Mix the phenolic resin for 20 seconds until the resin is melted and fully coated, then add hollow ceramic microspheres and mix for 75 seconds; (3) add water and mix for 85 seconds, then add urotropine and mix for 110 seconds until the water evaporates; (4) add stearic acid Calcium is mixed for 145s, cooled, sieved, tested, and packaged to obtain coated sand.

Embodiment 2

[0020] A high-temperature-resistant coated sand for casting, prepared from the following raw materials in parts by weight: 97 parts of raw sand, 2.5 parts of phenolic resin, 0.4 part of urotropine, 0.18 part of calcium stearate, and 0.2 part of hollow ceramic microspheres .

[0021] The high temperature-resistant coated sand in this example is prepared by the following steps: (1) preheat the raw sand to 110°C, add it into the sand mixer, and control the speed of the sand mixer to 220r / min; (2) add Mix the phenolic resin for 24 seconds until the resin is melted and fully coated, then add hollow ceramic microspheres and mix for 70 seconds; (3) add water and mix for 81 seconds, then add urotropine and mix for 115 seconds until the water evaporates; (4) add stearic acid Calcium is mixed for 150s, cooled, sieved, tested, and packaged to obtain coated sand.

Embodiment 3

[0023] A high-temperature-resistant coated sand for casting, prepared from the following raw materials in parts by weight: 98 parts of raw sand, 2.4 parts of phenolic resin, 0.3 part of urotropine, 0.15 part of calcium stearate, and 0.1 part of hollow ceramic microspheres .

[0024] The high temperature-resistant coated sand in this example is prepared by the following steps: (1) Preheat the raw sand to 100°C, add it to the sand mixer, and control the speed of the sand mixer to 240r / min; (2) add Mix the phenolic resin for 20 seconds until the resin is melted and fully coated, then add hollow ceramic microspheres and mix for 72 seconds; (3) add water and mix for 80 seconds, then add urotropine and mix for 112 seconds until the water evaporates completely; (4) add stearic acid Calcium is mixed for 145s, cooled, sieved, tested, and packaged to obtain coated sand.

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Abstract

The invention relates to the field of precoated sand, in particular to high-temperature resisting precoated sand for casting. The precoated sand is prepared from the following raw materials, by weight, of 97-98 parts of crude sand, 2-2.5 parts of phenolic resin, 0.3-0.4 part of urotropine, 0.15-0.2 part of calcium stearate, and 0.1-0.3 part of hollow ceramic micro-beads. According to the high-temperature resisting precoated sand for casting, the hollow ceramic micro-beads are added into the raw materials, because the hollow ceramic micro-beads have high temperature resistance and high heat resistance performance, the temperature rising speed and the decomposition speed of sand cores are decreased when molten iron is poured into the sand cores of the precoated sand, and the molten iron is effectively prevented from permeating into the sand cores, so that sand adhering of a casting is reduced, the number of defects of sand-adhering sintering is decreased significantly, and the rate of finished products of the casting is increased greatly.

Description

technical field [0001] The invention relates to the field of coated sand, in particular to a high temperature resistant coated sand for casting. Background technique [0002] Casting refers to the processing method of melting solid metal into a liquid state and pouring it into a mold of a specific shape, and waiting for it to solidify and form. The material to be cast is mostly a metal that was originally solid but heated to a liquid state, such as copper, iron, aluminum, tin, etc. The material of the mold can be sand, metal, or ceramics. In the current casting process, a large amount of coated sand is usually used for model preparation. In foundry production, sand sticking in castings will lead to unqualified castings. One of the main reasons for sand sticking in castings is related to coated sand cores. The decomposition speed of the sand core is faster than the cooling speed of molten iron, which causes molten iron to penetrate into the decomposed sand core. Formation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/02
CPCB22C1/00B22C1/02
Inventor 任文强
Owner LIUZHOU LIUJING TECH CO LTD
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