Thermal cracking resistant hard sand

A technology of no-bake sand and thermal cracking resistance, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of easy cracking, high brittleness, and low thermal cracking resistance, and achieve unbreakable, low brittleness, The effect of low production cost

Inactive Publication Date: 2011-01-12
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that are relatively brittle and pron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] Example 1:

[0019] A self-hardening sand with heat crack resistance, comprising raw sand, a binder, a curing agent, a coupling agent and a lubricant, wherein the amount of the curing agent is 30% of the amount of the binder, and the amount of the coupling agent is The amount of binder is 0.4%, the amount of binder is 5% of the amount of raw sand, the amount of lubricant is 1% of the amount of raw sand, the composition of the binder and its weight ratio are: furan resin 60, phenolic aldehyde Resin 30, tricresyl phosphate 15, raw sand includes recycled sand, quartz sand, silica sand and iron oxide powder.

Example Embodiment

[0020] Example 2:

[0021] A self-hardening sand with resistance to thermal cracking, comprising raw sand, a binder, a curing agent, a coupling agent and a lubricant, wherein the amount of the curing agent is 50% of the amount of the binder, and the amount of the coupling agent is The amount of binder is 0.2%, the amount of binder is 2% of the amount of raw sand, the amount of lubricant is 3% of the amount of raw sand, the composition of the binder and its weight ratio are: furan resin 70, phenolic aldehyde Resin 20, tricresol phosphate 5, raw sand includes recycled sand, quartz sand, silica sand and iron oxide powder.

Example Embodiment

[0022] Example 3:

[0023] A self-hardening sand with heat crack resistance, comprising raw sand, a binder, a curing agent, a coupling agent and a lubricant, wherein the amount of the curing agent is 40% of the amount of the binder, and the amount of the coupling agent is The amount of binder is 0.3%, the amount of binder is 3.5% of the amount of raw sand, the amount of lubricant is 2% of the amount of raw sand, the composition of the binder and its weight ratio are: furan resin 65, phenolic aldehyde Resin 25, tricresol phosphate 10, raw sand including recycled sand, quartz sand, silica sand and iron oxide powder.

[0024] It can be seen from the above that the present invention is not only less brittle, not easy to produce cracks, but also lower production cost.

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PUM

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Abstract

The invention discloses thermal cracking resistant hard sand, which comprises raw sand, adhesive, curing agent, coupling agent and lubricating agent, wherein the using amount of the curing agent is 30 to 50 percent based on the using amount of the adhesive, the using amount of the coupling agent is 0.2 to 0.4 percent based on the using amount of the adhesive, the using amount of the adhesive is 2 to 5 percent based on the using amount of the raw sand, and the using amount of the lubricating agent is 1 to 3 percent based on the using amount of the raw sand; the adhesive consists of the following components in part by weight: 60 to 70 parts of furan resin, 20 to 30 parts of phenolic resin and 5 to 15 parts of tricresyl phosphate; and the raw sand comprises return sand, quartz sand, silica sand and ferric oxide powder. The thermal cracking resistant hard sand has the advantages of low brittleness, cracking resistance and low cost.

Description

Technical field [0001] The invention relates to a self-setting sand, in particular to a self-setting sand with resistance to thermal cracking, and is particularly suitable for furan self-setting sand used in large-scale sand casting. Background technique [0002] Resin self-hardening sand is generally prepared by mixing silica sand, resin and hardener. Commonly used resins are furan resin, resole resin and urethane resin. The sand mold made of this kind of sand has high strength, accurate size, good collapsibility and low energy consumption. It can be used for the production of cast steel, cast iron and cast non-ferrous alloy castings with high surface quality and dimensional accuracy. Resin self-setting sand is a kind of modeling sand with great development prospects. [0003] The Chinese Patent Authorization Announcement Number is CN1216703C. The invention patent with the authorization announcement date on August 31, 2005 discloses a self-setting sand belonging to the foundry i...

Claims

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Application Information

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IPC IPC(8): B22C1/22
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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