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Method for CO2 blowing hardening of casting water glass sand

A technology of water glass sand and water glass, which is applied in casting and molding equipment, molds, and mold components, etc., can solve the problems of reduced mechanical properties of molds and cores, over-blowing defects, and poor core collapsibility. The effect of reducing gas volume, improving working conditions, and low gas production

Active Publication Date: 2019-03-01
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The "VRH" method has the following problems: vacuum first, then CO 2 Replacement, 20-60% of the space in the core sand gap is filled with CO 2 gas, these CO 2 Remains in the mold and continue to react with water glass, resulting in overblowing defects, reducing the mechanical properties of the mold and core
In production and application, the addition of water glass has to be increased, which makes the core collapsibility worse

Method used

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  • Method for CO2 blowing hardening of casting water glass sand
  • Method for CO2 blowing hardening of casting water glass sand

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The sealing box is ￠240mm×240mm, and the sealing cylinder is used. The vacuum pump is a 2XZ4 rotary vane vacuum pump. The core-making sand mixture is manually filled into the standard "8" type mold for compaction.

[0039] Proportion of core-making mixture: Dalin washed sand 1000g, ZS-2.5 modulus 2.4 foundry water glass 25g, silica fume 3g, add SHY blade type core sand mixer and mix well, fill the core-making sand mixture into the standard "8" "Type samples, manually compacted, scraped, 10 samples per batch, put into the sealed cylinder; start the vacuum pump, when the pressure in the sealed cylinder reaches 5Kpa, turn off the vacuum pump, open the CO 2 gas valve, the CO 2 The gas is passed into the sealed cylinder, and when the pressure in the sealed cylinder reaches 30Kpa, the CO2 is closed. 2 Air valve, hold for 20s, open the air valve, let the air quickly enter the sealing cylinder, the sealing cylinder returns to normal pressure, close the air valve; start the vac...

Embodiment 2

[0041] The sealing box is ￠240mm×240mm, and the sealing cylinder is used. The vacuum pump is a 2XZ4 rotary vane vacuum pump. The core-making sand mixture is manually filled into the standard "8" type mold for compaction.

[0042] Proportion of core-making mixture: standard sand 1000g, ZS-2.5 casting water glass 25g, zirconium silica 2g, mix with SHY blade type core sand mixer, fill the core-making mixture into the standard "8" type test Samples are manually tightened and scraped flat, and 10 samples are made in each batch, and put into the sealed cylinder; start the vacuum pump, and when the pressure in the sealed cylinder reaches 8Kpa, turn off the vacuum pump and turn on the CO 2 gas valve, the CO 2 The gas is passed into the sealed cylinder, and when the pressure in the sealed cylinder reaches 0.03Kpa, the CO2 is closed.2 Air valve, hold for 25s, open the air valve, let the air quickly enter the sealing cylinder, the sealing cylinder returns to normal pressure, close the ai...

Embodiment 3

[0044] The sealing box is ￠240mm×240mm, and the sealing cylinder is used. The vacuum pump is a 2XZ4 rotary vane vacuum pump. The core-making sand mixture is manually filled into the standard "8" type mold for compaction.

[0045] Proportion of core-making mixture: standard sand 1000g, HYT-S-106 casting water glass 20g, silica fume 1g, zirconium silica 1g, mix with a laboratory blade sand mixer, and fill the core-making sand mixture into the standard "8" type samples, manually compacted, scraped, 10 samples per batch, put into the sealed cylinder; start the vacuum pump, when the pressure in the sealed cylinder reaches 0.009Mpa, turn off the vacuum pump and turn on the CO 2 gas valve, the CO 2 The gas is passed into the sealed cylinder, and when the pressure in the sealed cylinder reaches 0.03Mpa, the CO2 is closed. 2 Air valve, hold for 25s, open the air valve, let the air quickly enter the sealing cylinder, the sealing cylinder returns to normal pressure, close the air valve;...

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Abstract

The invention provides a method for CO2 blowing hardening of casting water glass sand. The method for CO2 blowing hardening of casting water glass sand includes the steps of: after a to-be-hardened water glass sand product is placed in a seal box, performing vacuumizing for the first time to 3-20 Kpa, and introducing CO2 for blowing until the pressure reaches 20-60 Kpa, and maintaining the pressure for 5-120 s; introducing air into the seal box until the normal pressure is recovered, performing vacuumizing for the second time until the pressure reaches 2-19 Kpa, and maintaining the pressure for 1-120 s; introducing air until the normal pressure is recovered, and pushing out the product. According to the method, CO2 remaining in the product can be removed, and the mechanical property degradation caused by over-blowing is avoided.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to the blowing CO of water-based glass sand for casting 2 hardening method. Background technique [0002] At present, in foundry production, resin sand molding and core technology are widely used. The production process of artificial synthetic resin is complicated and the cost is high, and a large amount of poisonous and odorous gas will be released during core making and pouring with artificial synthetic resin, which will pollute the environment and endanger the health of workers. [0003] However, the existing inorganic binder molds and cores are mainly made of water glass sand blown CO 2 Hardening molding, core technology, "VRH" legal molding technology. The "VRH" method was invented by Kazunori Kobayashi in Japan in 1982. The process can be briefly described as follows: fill the mold with water glass sand to form a mold, then put the mold into a vacuum chamber, and after vacu...

Claims

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Application Information

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IPC IPC(8): B22C9/12B22C1/18
CPCB22C1/162B22C1/188B22C9/123
Inventor 魏甲殷行金广明
Owner SHENYANG HYATON FOUNDRY MATERIAL
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