Precoated sand capable of preventing nozzle from leaking sand

A technology of coated sand and sand leakage, applied in the field of coated sand, can solve the problems of high fluidity of coated sand, achieve the effect of solving the problem of nozzle sand leakage, low cost, and simple preparation process

Active Publication Date: 2015-06-24
LIUZHOU LIUJING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of nozzle sand leakage caused by the high fluidity of coated sand in the prior art, the inventors have gone through a lot of exploration and provided a kind of coated sand that can prevent nozzle sand leakage and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) take by weighing 155g microcrystalline paraffin and 103g calcium stearate, mix homogeneously, for subsequent use;

[0026] (2) Heat 50kg of Inner Mongolia Dalin raw sand 50 / 100 to 125°C and add it to the sand mixer;

[0027] (3) Add 1.03kg of phenolic resin binder to the heated raw sand, and stir evenly to melt the phenolic resin and fully cover the film;

[0028] (4) Add urotropine solution, which contains urotropine 206g;

[0029] (5) heating the mixture, after the moisture has been volatilized, add the prepared microcrystalline paraffin and calcium stearate mixture in step (1);

[0030] (6) Cool the above mixture, crush and sieve to obtain the finished coated sand.

Embodiment 2

[0032] (1) take by weighing 51.5g microcrystalline paraffin and 77.5g calcium stearate, mix homogeneously, for subsequent use;

[0033] (2) Heat 50kg of Inner Mongolia Dalin raw sand 50 / 100 to 125°C and add it to the sand mixer;

[0034] (3) Add 1.29kg of phenolic resin binder to the heated raw sand, and stir evenly to melt the phenolic resin and fully cover the film;

[0035] (4) Add urotropine solution, which contains urotropine 155g;

[0036] (5) heating the mixture, after the moisture has been volatilized, add the prepared microcrystalline paraffin and calcium stearate mixture in step (1);

[0037] (6) Cool the above mixture, crush and sieve to obtain the finished coated sand.

Embodiment 3

[0039] (1) take by weighing 59g microcrystalline paraffin and 93g calcium stearate, mix homogeneously, for subsequent use;

[0040] (2) Heat 50kg of Inner Mongolia Dalin raw sand 50 / 100 to 125°C and add it to the sand mixer;

[0041] (3) Add 1.18kg of phenolic resin binder to the heated raw sand, and stir evenly to melt the phenolic resin and fully cover the film;

[0042] (4) Add urotropine solution, which contains urotropine 180g;

[0043] (5) heating the mixture, after the moisture has been volatilized, add the prepared microcrystalline paraffin and calcium stearate mixture in step (1);

[0044] (6) Cool the above mixture, crush and sieve to obtain the finished coated sand.

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Abstract

The invention provides precoated sand capable of preventing a nozzle from leaking sand. The precoated sand comprises crude sand, an adhesive, a curing agent and a lubricating agent, and is characterized by further comprising microcrystalline wax with the weight content of 0.1-0.3%. Compared with the conventional precoated sand, the precoated sand has the advantages that a certain amount of microcrystalline wax is added into the precoated sand; the melting point of the microcrystalline wax is about 65-90 DEG C which is consistent with that of the core making nozzle, so that the microcrystalline wax is melted at the core making temperature, and the fluidity of the precoated sand is greatly reduced; furthermore, the microcrystalline wax is volatilized in the core making process, so that side effects are not caused for the later pouring, and the problem of sand leakage of the nozzle caused by the high fluidity of the precoated sand can be further solved.

Description

technical field [0001] The invention relates to a coated sand, in particular to a coated sand containing microcrystalline paraffin to prevent sand leakage from nozzles. Background technique [0002] Coated sand is a molding material for shell-type precision casting. It has the characteristics of good preservation, high dimensional accuracy and smooth surface of the produced castings. It can be used in the production of cast steel, cast iron, alloy castings and non-ferrous metal castings. Coated sand is usually made of quartz sand as raw sand, supplemented with binder and curing agent. However, when using coated sand to make cores, due to the good fluidity of the coated sand, when the core shooting nozzle is lifted after the core shooting is completed, there will be sand leakage from the nozzle, which will affect the quality and shape of the core shooting. It is one of the main problems in the current foundry core making process. At present, in order to prevent the sand lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/22B22C5/04
Inventor 任文虎孙立伟赵璐
Owner LIUZHOU LIUJING TECH CO LTD
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