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Precoated sand for casting and preparation method thereof

A technology of coated sand and raw sand, which is applied to casting molding equipment, casting molds, manufacturing tools, etc., can solve problems such as easy deformation, achieve the effects of increasing strength, reducing consumption, and ensuring stability

Inactive Publication Date: 2015-07-22
TONGLIN CASTING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Provide a high-strength coated sand and its preparation method, which can overcome the defects of the existing coated sand that are easily deformed during casting, make full use of the earth expansion rate and approximately spherical characteristics of the pearl sand, supplemented by thermally regenerated silica sand, and strengthen the coated sand. Improve sand strength and reduce high temperature expansion deformation, effectively solve the defect of inner cavity shape change caused by high temperature deformation of coated sand core

Method used

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  • Precoated sand for casting and preparation method thereof
  • Precoated sand for casting and preparation method thereof
  • Precoated sand for casting and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Thermal reclaimed sand is 40 / 70 mesh, Baozhu sand is 50 / 30 mesh, Baozhu sand accounts for 30% of the original sand weight, thermal reclaimed sand accounts for 70% of the original sand weight, the adhesive is 2% of the original sand weight, and the curing agent is 40% of the weight of the adhesive, the coupling agent is 0.5% of the weight of the adhesive, the lubricant is 40% of the weight of the adhesive, and the plasticizer is 5% of the weight of the adhesive.

[0031] Start the machine → preheat the raw sand to 138°C → add hot sand to the sand mixer → evenly add resin and dibutyl fat (completed in 40 seconds) → start filming at the same time → spray curing agent after 75 seconds → add stearin after 35 seconds Calcium acid → air cooling for 60 seconds, sand production → crushing, sieving → proceed to the next cycle.

[0032]

Embodiment 2

[0034] Thermal reclaimed sand is 50 / 100 mesh, Baozhu sand is 50 / 100 mesh, Baozhu sand accounts for 100% of the original sand weight, thermal method regenerated sand accounts for 0% of the original sand weight, the adhesive is 3% of the original sand weight, and the curing agent is 60% of the weight of the adhesive, the coupling agent is 0.8% of the weight of the adhesive, the lubricant is 60% of the weight of the adhesive, and the plasticizer is 8% of the weight of the adhesive.

[0035] Start the machine → preheat the raw sand to 148°C → add hot sand to the sand mixer → evenly add resin, dibutyl fat and silane (completed in 40 seconds) → start coating at the same time → spray curing agent after 85 seconds → add after 35 seconds Calcium stearate → air cooling for 60 seconds, sand production → crushing, sieving → proceed to the next cycle.

[0036]

Embodiment 3

[0038] Thermal reclaimed sand is 40 / 70 mesh, Baozhu sand is 50 / 100 mesh, Baozhu sand accounts for 50% of the original sand weight, thermal method regenerated sand accounts for 50% of the original sand weight, the adhesive is 2.5% of the original sand weight, and the curing agent is 50% of the weight of the adhesive, the coupling agent is 0.55% of the weight of the adhesive, the lubricant is 50% of the weight of the adhesive, and the plasticizer is 6.5% of the weight of the adhesive.

[0039] Start the machine → preheat the raw sand to 143°C → add hot sand to the sand mixer → evenly add resin, dibutyl fat and silane (completed in 40 seconds) → start coating at the same time → spray curing agent after 80 seconds → add after 30 seconds Calcium stearate → air cooling for 60 seconds, sand production → crushing, sieving → proceed to the next cycle.

[0040]

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Abstract

The invention discloses a precoated sand for casting, which comprises raw sand, an adhesive, a curing agent, a coupling agent and a plasticizer. The adhesive accounts for 2-3 wt% of raw sand, the curing agent accounts for 40-60 wt% of the adhesive, the coupling agent accounts for 0.5-0.8 wt% of the adhesive, the lubricant accounts for 40-60 wt% of the adhesive, the plasticizer accounts for 5-8 wt% of the adhesive, the raw sand comprises thermal reclaimed sand and ceramic foundry sand, and the ceramic foundry sand accounts for 30-100 wt% of the raw sand. The invention also discloses a preparation method of the precoated sand for casting. The precoated sand prepared according to the formula and preparation method has the characteristics of high strength, low gas yield and low expansion ratio, and can keep the shape. When being used for core shooting under preset conditions and used for pouring castings, the precoated sand can greatly lower the pore generation rate, ensures the structural stability of the sand mold (core) under the condition of casting, and can not easily deform, thereby ensuring the casting shape to satisfy the design requirement.

Description

technical field [0001] The invention belongs to casting process material technology, in particular to a kind of coated sand for casting. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. There are two coating processes: cold method and hot method: the cold method dissolves the binder with ethanol, and adds a curing agent during the sand mixing process to coat the two on the surface of the sand, and the ethanol volatilizes to obtain coated sand; The method preheats the sand to a certain temperature, melts the binder, stirs and coats the film on the surface of the sand, adds a solidifying agent aqueous solution and a lubricant, cools, crushes, and sieves to obtain the coated sand. For steel castings and iron castings. Because coated sand has the advantages of high strength, low gas generation, high dimensional accuracy of castings, smooth surface and easy...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02B22C1/16
CPCB22C1/00B22C1/02B22C1/16
Inventor 聂越
Owner TONGLIN CASTING IND
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