No-bake resin sand for sand casting of magnesium alloy and preparation method thereof

A technology of sand casting and magnesium alloy, which is applied in casting molding equipment, metal processing equipment, casting molds, etc. It can solve the problems of resin self-hardening sand that have not been reported, and achieve the effect of excellent surface quality, good air permeability, and high strength

Inactive Publication Date: 2010-08-18
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Further retrieval found that κ.и. Portnoy, A.A. Lebedev disclosed in "Magnesium Alloy Handbook" (Beijing: Metallurgical Industry Press, 1959) that due to its active characteristics, magnesium alloys can be used at high temperatures It will react wi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Resin no-bake sand for magnesium alloy sand casting, its composition mass percentage is: 30-70 mesh silica sand 51%, 70-200 mesh silica sand 49%, resin addition is 1% of the total weight of silica sand, curing agent addition is resin addition The amount of flame retardant added is 1% of the total weight of silica sand.

[0020] After weighing the silica sand according to the proportion, pour it into the sand mixer, mix for 2 minutes, add the flame retardant, mix for 3 minutes, then add the resin, mix for 3 minutes, finally add the curing agent, mix for 1 minute and then produce sand It is used for the preparation of sand cores and the pouring of magnesium alloy castings, and the surface quality of the cast magnesium alloy castings is excellent.

[0021] The tensile strength of resin self-setting sand for magnesium alloy sand casting is 1.5MPa, the gas generation is 4.5ml / g, and the air permeability is 350.

Embodiment 2

[0023] Resin self-bake sand for magnesium alloy sand casting, its composition mass percentage is: 30-70 mesh silica sand 70%, 70-200 mesh silica sand 30%, resin addition is 2% of the total weight of silica sand, curing agent addition is resin addition 50% of the total weight of the silica sand, and the addition of the flame retardant is 5% of the total weight of the silica sand.

[0024] After weighing the silica sand according to the proportion, pour it into the sand mixer, mix for 8 minutes, add the flame retardant, mix for 10 minutes, then add the resin, mix for 8 minutes, finally add the curing agent, mix for 5 minutes and then produce sand It is used for the preparation of sand cores and the pouring of magnesium alloy castings, and the surface quality of the cast magnesium alloy castings is excellent.

[0025] The tensile strength of resin self-setting sand for magnesium alloy sand casting is 1.2MPa, the gas generation is 8ml / g, and the air permeability is 400.

Embodiment 3

[0027] Resin no-bake sand for magnesium alloy sand casting, its composition mass percentage is: 30-70 mesh silica sand 100%, 70-200 mesh silica sand 0%, resin addition is 1.5% of the total weight of silica sand, curing agent addition is resin addition 40% of the total weight of the silica sand, and the addition of the flame retardant is 3% of the total weight of the silica sand.

[0028] After weighing the silica sand according to the proportion, pour it into the sand mixer, mix for 4 minutes, add the flame retardant, mix for 6 minutes, then add the resin, mix for 4 minutes, finally add the curing agent, mix for 4 minutes and then produce sand It is used for the preparation of sand cores and the pouring of magnesium alloy castings, and the surface quality of the cast magnesium alloy castings is excellent.

[0029] The tensile strength of resin self-setting sand for magnesium alloy sand casting is 1.1MPa, the gas generation is 6ml / g, and the air permeability is 460.

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Abstract

The invention discloses no-bake resin sand for sand casting of a magnesium alloy in the technical field of metal processing and a preparation method thereof. The no-bake resin sand comprises the following components in percentage by weight: 51 to 100 percent of fine silica sand and 0 to 50 percent of coarse silica sand; the adding amount of resin is 0.8 to 2 percent of the total weight of the fine silica sand and the coarse silica sand of resin; the adding amount of a curing agent is 20 to 60 percent of the adding amount of the resin; and the adding amount of a fire retardant is 1 to 5 percent of the total weight of the fine silica sand and the coarse silica sand. The no-bake resin sand prepared by the invention has higher intensity, good air permeability and less gas evolution. In the casting process, due to the addition of the fire retardant, the reaction and combustion between magnesium and silica sand and impurities in the silica sand can be prevented, and magnesium alloy castings with excellent surface quality can be obtained.

Description

technical field [0001] The invention relates to a material in the technical field of metal processing and a preparation method thereof, in particular to resin self-setting sand for magnesium alloy sand casting and a preparation method thereof. Background technique [0002] In my country and the world, castings produced with sand molds account for more than 80% of the total casting production. Before the 1950s and 1960s, sand castings in my country were mainly made of clay sand and water glass sand. Since the 1960s and 1970s, the resin self-setting sand process has been adopted by many cast iron, cast steel and non-ferrous alloy foundries. Widely used, resin sand has been used to produce large hydraulic turbine rotor steel castings with complex shapes, high dimensional accuracy requirements, low surface roughness, and a weight of more than 50 tons. Many machine tool factories have used resin sand to produce export machine tool castings, etc. . At present, the production of ma...

Claims

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Application Information

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IPC IPC(8): B22C1/22
Inventor 王迎新彭立明蒋海燕付彭怀丁文江
Owner SHANGHAI JIAO TONG UNIV
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