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High thermal conductivity composite sand core for aluminum alloy casting, and preparation method of high thermal conductivity composite sand core

A composite sand core and aluminum alloy technology, which is applied in the field of aluminum alloy casting, can solve problems such as coarse grains, difficulty in setting cold iron, and unstable mechanical properties.

Active Publication Date: 2018-05-15
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cold iron is generally used to increase the solidification speed and improve the internal quality of hot joints with regular shapes. However, for complex aluminum alloy castings with special-shaped or curved surface scattered hot joints, it is difficult to set the cold iron, and the cooling capacity of ordinary sand molds is insufficient. The parts are prone to defects such as shrinkage cavity and porosity, and the grains are coarse, and the mechanical properties are unstable

Method used

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  • High thermal conductivity composite sand core for aluminum alloy casting, and preparation method of high thermal conductivity composite sand core

Examples

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Effect test

Embodiment 1

[0016] This embodiment is an aluminum-silicon ZL114A special-shaped shell casting. The thickness of the scattered and isolated thermal joints is 12mm, and the size is 50mm×50mm. The process is sand gravity casting, and the composition and mass percentage of the composite sand core are iron powder (40 mesh to 70 mesh) 20%, limestone sand (40 mesh to 70 mesh) 10%, zircon sand (70 mesh to 140 mesh) 6 %, and the rest is scrubbing sand (40 mesh to 70 mesh). The sand core binder is phenolurethane resin, the amount of resin component I added is 0.6% of the sand weight, the amount of resin component II added is 0.8% of the sand weight, and the amount of curing agent added is 1.0% of the total weight of the resin. Resin component I is phenyl ether phenolic resin, resin component II is polyisocyanic acid, and curing agent is liquid tertiary amine.

[0017] The preparation method of the sand core is as follows: first add the phenol urethane resin curing agent to component I, mix well, a...

Embodiment 2

[0020] This embodiment is an aluminum-copper ZL205A cabin body casting. The size of the hot joint of the internal rib plate is 18mm, the surrounding wall thickness is 5mm, and the hot joint is in transition with other parts of the curved surface. The process is sand gravity casting, and the composition and mass percentage of the composite sand core are iron powder (70 mesh to 140 mesh) 35%, limestone sand (70 mesh to 140 mesh) 15%, zircon sand (40 mesh to 70 mesh) 8 %, and the rest is scrubbing sand (40 mesh to 70 mesh). The sand core binder is phenol urethane resin, the addition of resin component I is 0.8% of the sand weight, the addition of resin component II is 0.6% of the sand weight, and the addition of curing agent is 1.2% of the total weight of the resin. Resin component I is phenyl ether phenolic resin, resin component II is polyisocyanic acid, and curing agent is liquid tertiary amine.

[0021] The preparation method of the sand core is as follows: first add the phe...

Embodiment 3

[0024] This embodiment is an aluminum-magnesium ZL305 special-shaped box casting. The maximum thickness of the isolated curved surface heat joint is 22mm, and the rest is a uniform transition to a thickness of 8mm. The heat joint size is 35mm×60mm. The process is sand mold low-pressure casting. The composition and mass percentage of the composite sand core are iron powder (40 mesh to 70 mesh) 45%, limestone sand (70 mesh to 140 mesh) 18%, zircon sand (70 mesh to 140 mesh) 8% %, potassium fluoroborate (200 mesh) 0.6%, sulfur powder (200 mesh) 0.5%, and the rest is scrubbing sand (40 mesh to 70 mesh). The sand core binder is phenol urethane resin, the amount of resin component I added is 0.9% of the sand weight, the amount of resin component II added is 1.0% of the sand weight, and the amount of curing agent added is 1.2% of the total weight of the resin. Resin component I is phenyl ether phenolic resin, resin component II is polyisocyanic acid, and curing agent is liquid tertia...

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Abstract

The invention provides a composite sand core for aluminum alloy casting. The composite sand core is prepared from the following raw materials by mass percent: 10-50% of iron powder with particle sizeof 40-140 meshes, 10-20% of limestone sand with particle size of 40-140 meshes, 5-10% of zircon sand with particle size of 40-140 meshes, and the balance of scrubbing sand with particle size of 40-70meshes. The cooling speed of a casting mold is regulated and controlled by improving the formula of the sand core, and multiple casting mold materials such as iron, limestone sand and zirconium sand are accurately compounded with molding original sand (scrubbing sand), so that the sand core is prepared; during molding, the sand core is embedded in the casting mold, so that the local thermal conductivity of the casting mold is changed, the temperature field of the casting mold is reconstructed, the sequential solidification of dispersed thermal section areas of a complex casting is realized, the ability of feeding a casting is improved, the grains are refined, and the loosening defect is inhibited.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy casting, and in particular relates to an aluminum alloy casting high thermal conductivity composite sand core and a preparation method thereof. Background technique [0002] Cast aluminum alloy is a typical cast light alloy with low density and high specific strength. It is widely used in aviation, aerospace, weapons, ships, automobiles and other fields. With the development of lightweight equipment components, the structural design of aluminum alloy castings tends to be complex, with many scattered hot spots, the difficulty of ordinary sand casting process, the difficulty of placing cold iron in special-shaped complex cavities, and the solidification speed of thin-walled parts around hot spots Fast, easy to block the feeding channel of the isolated hot joint, the internal quality of the casting's special-shaped scattered hot joint is seriously exceeded, and the qualified rate is low. [0...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C9/10B22C9/22
CPCB22C1/00B22C9/10B22C9/22
Inventor 黄志伟陶健全赵高瞻陈强张艳平万元元李明
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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