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Method for manufacturing mold core of inorganic binder sand cold core box for casting

An inorganic binder and core technology, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of easy overblowing of the core process, high amount of binder added, low sand mold strength, etc., and achieve core High strength, low addition amount, and the effect of realizing environmental protection production

Inactive Publication Date: 2020-01-21
CHINA FIRST AUTOMOBILE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can solve the problem of blowing CO with glass sand in casting water in the prior art 2 Problems such as easy overblowing in hardening molding and core technology, high amount of binder added, and low sand mold strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The standard "8" sample mold is used to make the core. Proportion of core-making mixture: Dalin scrubbing sand 1kg, casting water glass with a modulus of 2.0 (sodium silicate aqueous solution, 1.4g / cm 3 ) 20g, silicon dioxide 3g, mixed by a sand mixer, put the core sand mixture into the mould, and then hammer it three times for compaction, start the air blowing control cabinet, and pass in carbon dioxide and compressed air in turn, specifically, CO 2 The gas pressure is 0.2MPa and keeps blowing for 20s, and the pressure of compressed air is 0.2MPa and keeps blowing for 25s, and the hardening is over.

[0037] Take out the sample and use a hydraulic testing machine to test the tensile strength of the sample, measure the instant strength within 5s, and take the average value of 3 samples; after 4 hours in the room, test the 4h tensile strength of the sample, and test the final value of the sample after 24 hours in the room. strength. The specific results are as follows...

Embodiment 2

[0039] The standard "8" sample mold is used to make the core. Proportion of core-making mixture: Dalin scrub sand 1kg, casting water glass with a modulus of 2.5 (potassium silicate, 1.6g / cm 3 ) 20g, silicon dioxide 5g, mixed by a sand mixer, put the core sand mixture into the mold, and then hammer three times, start the blowing control cabinet, and then pass in carbon dioxide and compressed air, specifically, CO 2 The gas pressure is 0.3MPa and keeps blowing for 15s, and the pressure of compressed air is 0.4MPa and keeps blowing for 45s, and the hardening is over.

[0040] Take out the sample and use a hydraulic testing machine to test the tensile strength of the sample, measure the instant strength within 5s, and take the average value of 3 samples; after 4 hours in the room, test the 4h tensile strength of the sample, and test the final value of the sample after 24 hours in the room. strength. The specific results are as follows: the immediate tensile strength is 0.47MPa, ...

Embodiment 3

[0042] The standard "8" sample mold is used to make the core. Proportion of core-making mixture: Dalin scrub sand 1kg, casting water glass with a modulus of 1.7 (lithium silicate, 1.4g / cm 3 ) 25g, silicon dioxide 4g, mixed by a sand mixer, put the core sand mixture into the sand shooting cylinder, hammer it three times, start the air blowing control cabinet, and pass in carbon dioxide and compressed air in sequence, specifically, CO 2 The gas pressure is 0.15MPa and keeps blowing for 25s, and the pressure of compressed air is 0.4MPa and keeps blowing for 90s, and the hardening is over.

[0043] Take out the sample and use a hydraulic testing machine to test the tensile strength of the sample, measure the instant strength within 5s, and take the average value of 3 samples; after 4 hours in the room, test the 4h tensile strength of the sample, and test the final value of the sample after 24 hours in the room. strength. The specific results are as follows: the instant tensile s...

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Abstract

The invention discloses a method for manufacturing a mold core of an inorganic binder sand cold core box for casting. The method comprises the following steps of: filling a mixture of an inorganic binder for casting, an optional additive and crude sand into a mold, and hardening the mold core by blowing, wherein the blowing process is a mode I or a mode II, the mode I is a mode of blowing CO2 gasand compressed gas in sequence, and the mode II is a mode of blowing the compressed gas, the CO2 gas and the compressed gas in sequence, and the CO2 gas and the compressed gas have pressure. The method can solve the problems of easy over-blowing, high binder adding amount, low sand mold strength and the like in the process of hardening the mold core by blowing CO2 through water glass sand for casting in the prior art. Compared with the common CO2 blowing method, the method has the advantages that the strength of the manufactured mold core can be obviously improved, and the used sand can be regenerated and recycled.

Description

technical field [0001] The invention relates to the technical field of casting, and relates to a method for making a core with an inorganic binder sand cold core box for casting. Background technique [0002] CO 2 Hardened water glass was used in casting production as early as the early 1950s. This method has the advantages of simple equipment, low cost, no need for the core to be dried in a kiln, fast hardening speed, short production cycle, and good working conditions. The mold is lifted to make the castings have the advantages of dimensional accuracy, clear outline, and low surface roughness. However, water glass sand blowing CO 2 The following problems exist in the application of the hardened core making process: easy overblowing, low mechanical properties of the sand core, in order to ensure that the water glass sand core has sufficient process performance, the addition of water glass has to be increased, and the addition of water glass is as high as 5%. -8%, resulti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/12B22C9/10B22C1/18B22C1/00
CPCB22C1/00B22C1/188B22C9/10B22C9/123
Inventor 张宏奎
Owner CHINA FIRST AUTOMOBILE
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