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Inorganic precoated sand and manufacturing method thereof

A manufacturing method and technology of coated sand, which are used in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problem that inorganic coated sand cannot be used for ferrous metal casting, etc., reduce residual strength, achieve collapsibility, and ease collapsing effect

Inactive Publication Date: 2016-08-17
LIUZHOU LIUJING TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide an inorganic coated sand that can be used for ferrous metal casting and is easy to collapse and its manufacturing method in view of the disadvantage that the existing inorganic coated sand cannot be used for ferrous metal casting

Method used

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  • Inorganic precoated sand and manufacturing method thereof
  • Inorganic precoated sand and manufacturing method thereof
  • Inorganic precoated sand and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The raw materials of the coated sand are proportioned according to weight percentage, wherein as the inorganic binder, water glass is 5%, copper oxide is 1%, and the balance is Inner Mongolia Dalin 50 / 100 raw sand (AFS value is 54).

[0015] The manufacturing process is as follows:

[0016] S1: Copper oxide and water glass are mixed evenly in proportion, so that copper oxide is evenly distributed in water glass;

[0017] S2: Add the uniformly mixed material and raw sand prepared in step S1 into the sand mixer in proportion, and use traditional techniques to mix evenly;

[0018] S3: The material prepared in step S2 is crushed and screened, and packaged and stored after cooling. It can be cooled to room temperature and packed in a woven bag, the inner layer of which is a plastic bag.

[0019] The coated sand prepared by the above-mentioned component ratio and production method is made into a "8" block in a 180-degree mold, and the normal temperature strength of the samp...

Embodiment 2

[0026] The raw materials of the coated sand are proportioned according to weight percentage, wherein as the inorganic binder, water glass is 3%, copper oxide is 1.5%, and the balance is Inner Mongolia Dalin 50 / 100 raw sand (AFS value is 54).

[0027] The coated sand prepared by the above-mentioned component ratio and production method is made into a "8" block in a 180-degree mold, and the normal temperature strength of the sample block is tested;

[0028] The above samples were calcined and heated at 1400°C for 2 minutes, then cooled to detect the residual tensile strength.

[0029] As a comparison, the coated sand containing 3% water glass is made into a sample block according to the above process, and its residual strength at room temperature and after being calcined and heated at 1400 degrees Celsius for 2 minutes and then cooled is also tested. The strength test refers to JB / T 8583-2008 casting Using coated sand, the comparison results are shown in Table 2:

[0030] Table...

Embodiment 3

[0034] The raw materials of the coated sand are proportioned according to weight percentage, wherein the inorganic binder is 7% water glass, 2.5% copper oxide, and the balance is Inner Mongolia Dalin 50 / 100 raw sand (AFS value is 54).

[0035] The coated sand prepared by the above-mentioned component ratio and production method is made into a "8" block in a 180-degree mold, and the normal temperature strength of the sample block is tested;

[0036] The above samples were calcined and heated at 1400°C for 2 minutes, then cooled to detect the residual tensile strength.

[0037] As a comparison, the coated sand containing 7% water glass is made into a sample according to the above process, and its residual strength at room temperature and after being calcined at 1400 degrees Celsius for 2 minutes and then cooled is also tested. The strength test refers to JB / T 8583-2008 casting Using coated sand, the comparison results are shown in Table 3:

[0038] Table 3 Strength test of coat...

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Abstract

The invention relates to coated sand and a manufacturing method thereof. In order to solve the disadvantage of poor collapsibility of the existing inorganic coated sand after high-temperature pouring, the invention discloses an inorganic coated sand, which is made of the following raw materials in weight percentage: 2% ‑7% inorganic binder, 0.5%‑3% copper oxide, and the balance is raw sand. The manufacturing method of the coated sand is as follows: mix the inorganic binder and copper oxide powder in proportion to the raw sand Add it to the sand mixer for mixing according to the traditional process, then cool, sieve and pack. In the present invention, due to the addition of copper oxide, the semi-ceramic substance of the inorganic binder after high-temperature pouring is a honeycomb substance, the residual strength is greatly reduced, and the collapsibility is realized.

Description

technical field [0001] The present invention relates to a casting molding sand and its manufacturing method, more specifically, to an inorganic coated sand and its manufacturing method. Background technique [0002] Inorganic coated sand is an inorganic binder, and because it has no gas, it is a new type of molding material that casting is looking forward to. However, when ferrous metal casting is carried out, due to the high pouring temperature of molten metal, the inorganic binder becomes molten at 1300-1400 degrees Celsius, and becomes a semi-ceramic substance after cooling down, with high residual strength and is not easy to break, resulting in inorganic Coated sand cannot be cleaned after black casting is used, so inorganic coated sand cannot be used on black casting. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an inorganic coated sand that can be used for ferrous metal casting and is easy to collapse a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/02B22C1/18
CPCB22C1/02B22C1/188
Inventor 任文强张和芹石磊蔡瀚陈拾龙石强游有华
Owner LIUZHOU LIUJING TECH CO LTD
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