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Composite sand core for casting and preparation method thereof

A technology of composite sand core and foundry sand, applied in the field of foundry sand core, can solve the problems of many technological factors of quality, difficult to guarantee product quality, increase in cost, etc. Effect

Inactive Publication Date: 2020-06-12
LUOYANG PENGQI IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the chilling effect and poor yield of graphite in machine-added graphite casting, many defects (such as cracks, cold shuts, flow marks, etc.) It can be processed, the cost is also greatly increased, and the product quality is difficult to guarantee. In addition, the wall thickness of machine-added graphite casting generally cannot be less than 3mm
However, the casting process of investment precision casting is complex, with many procedures, many process factors affecting quality, difficult to control, and long production cycle. Not only that, the complex cavity of investment precision casting needs to be specially designed and applied with special ceramic cores, and special ceramic molds The production cost of the core is very high, and it is difficult to clean the mold in the later stage. In addition, the investment casting precision casting is not suitable for casting large-scale castings

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the casting composite sand core of the present embodiment comprises the following steps:

[0036] 1) Take 39 parts by weight of mullite sand with a particle size of 16 mesh, 45 parts by weight of mullite sand with a particle size of 40 mesh, and 22.5 parts by weight of mullite powder with a particle size of 300 mesh, and perform dry mixing to obtain casting sand;

[0037] Then add resin binder and curing agent to the foundry sand, stir and mix to obtain a mixture, then fill the mixture into an aluminum core box for modeling, take it out after curing, and obtain the original sand core; resin binder The total mass of the curing agent and the curing agent accounts for 5% of the foundry sand quality, and the mass ratio of the resin binder and the curing agent is 1:1; the resin bond used is furan resin (nitrogen content is 5.8%), and the curing agent is sulphur. acid curing agent;

[0038] 2) Finish the surface of the sand core blank, remove the fl...

Embodiment 2

[0044] The preparation method of the casting composite sand core of the present embodiment comprises the following steps:

[0045] 1) Take 45 parts by weight of mullite sand with a particle size of 30 mesh, 35 parts by weight of mullite sand with a particle size of 50 mesh, and 15 parts by weight of mullite powder with a particle size of 250 mesh, and perform dry mixing to obtain foundry sand;

[0046] Then add resin binder and curing agent to the foundry sand, stir and mix to obtain a mixture, then fill the mixture into an aluminum core box for modeling, take it out after curing, and obtain the original sand core; resin binder The total mass of the solidifying agent and the solidifying agent accounts for 3% of the foundry sand mass, and the mass ratio of the resin binder and the solidifying agent is 1.3:1; the resin bond used is phenolic resin (pH value 12~14), and the solidifying agent is glycerol acetate ester;

[0047] 2) Finish the surface of the sand core blank, remove ...

Embodiment 3

[0053] The preparation method of the casting composite sand core of the present embodiment comprises the following steps:

[0054] 1) Take 50 parts by weight of mullite sand with a particle size of 25 mesh, 37.5 parts by weight of mullite sand with a particle size of 70 mesh, and 22.5 parts by weight of mullite powder with a particle size of 350 mesh, and perform dry mixing to obtain casting sand;

[0055] Then add resin binder and curing agent to the foundry sand, stir and mix to obtain a mixture, then fill the mixture into an aluminum core box for modeling, take it out after curing, and obtain the original sand core; resin binder The total mass of the curing agent and the curing agent accounts for 4% of the foundry sand quality, and the mass ratio of the resin binder and the curing agent is 1.2:1; the resin bond used is phenolic furan resin (3.5% nitrogen content), and the curing agent is sulfonic acid acid curing agent;

[0056] 2) Finish the surface of the sand core blank...

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Abstract

The invention relates to a composite sand core for casting and a preparation method thereof, and belongs to the technical field of sand cores for casting. The preparation method of the composite sandcore for casting comprises the following steps that 1, casting sand, a resin adhesive and a curing agent are mixed to be uniform, modeling and curing are performed to obtain a sand core original blank; 2, first-time calcination is performed on the sand core original blank, only resin obtained after the surface layer of the sand core original blank is cured is decomposed, and a first-time calcinated sand core is manufactured; 3, the first-time calcinated sand core is soaked with a siliconing casting adhesive, drying is performed, then, second-time calcination is performed, and a second-time calcinated sand core is obtained. The composite sand core for casting obtained by adopting the preparation method is good in collapsibility, the later cast cleaning difficulty can be lowered, and the sand core is particularly applicable to a casting with a narrow cavity; the deformability is good, the heat conductivity is poor, and the defects such as cracks and cold shuts of the casting inner cavitycan be even reduced; the structural design is reasonable, the size precision is high, molding is rapid, no deformation is caused, and the sand core is a preferential substitute product of an originalmachine added graphite core.

Description

technical field [0001] The invention relates to a composite sand core for casting and a preparation method thereof, belonging to the technical field of sand core for casting. Background technique [0002] With the rapid development of aviation, aerospace, weapons, ships and other fields, there is an increasing demand for titanium alloy castings with large, thin-walled and complex cavities. The main casting processes used for titanium alloy precision castings at home and abroad are machine-added graphite casting and investment casting, both of which have their limitations. Due to the chilling effect and poor yield of graphite in machine-added graphite casting, many defects (such as cracks, cold shuts, flow marks, etc.) It can be processed, the cost is also greatly increased, and the product quality is difficult to guarantee. In addition, the wall thickness of machine-added graphite casting generally cannot be less than 3mm. However, the casting process of investment precisi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22B22C3/00B22C9/10B22C9/12
CPCB22C1/224B22C3/00B22C9/10B22C9/12
Inventor 王涛亮赵亚利李万印杨莹陈萍
Owner LUOYANG PENGQI IND
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