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Lost Foam Casting Process of High Carbon Equivalent and High Strength Gray Iron Castings

A technology of lost foam casting and high carbon equivalent, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., and can solve problems such as reducing the strength of castings, casting waste products, and refractory coatings that cannot meet the ideal requirements.

Active Publication Date: 2021-08-13
浙江浦江精宇铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] High carbon equivalent gray iron castings have very considerable strength, but the current technology and patents often have more shrinkage and porosity defects in casting production, which seriously reduces the strength of castings, and more seriously may lead to a large number of casting wastes
[0008] In addition to isolating the direct contact between molten metal and molding sand and preventing physical and chemical sand sticking in castings, coatings can also form and protect casting cavities. Although the lost foam casting process is currently developing rapidly, the refractory coatings used cannot meet the ideal requirements.

Method used

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  • Lost Foam Casting Process of High Carbon Equivalent and High Strength Gray Iron Castings
  • Lost Foam Casting Process of High Carbon Equivalent and High Strength Gray Iron Castings
  • Lost Foam Casting Process of High Carbon Equivalent and High Strength Gray Iron Castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high-carbon equivalent high-strength gray iron casting and its lost foam casting process, the process flow is as follows:

[0036] Step 1. Foam mold making: use computerized automatic cutting technology to cut foam, then mold the cut foam, spray refractory coating after assembly, dry in a drying room at 50°C after spraying, and repeat drying 3 times to ensure The foam mold does not contain moisture;

[0037] Step 2. Casting process: spread 10cm of sand at the bottom of the sand box, then put the mold into the sand box, and use the rain-type falling sand to cover the mold with the sand box cover. The sand is in seamless contact, and then covered with a 6-wire plastic film, and the sand box is pumped electromechanically through the inner wall hole to achieve a uniform internal negative pressure; then the high-strength gray iron castings are cast at 1400 ° C, and the dust removal work is always running during the casting ;

[0038] Step 3. Sand removal: separate the sand...

Embodiment 2

[0050] A high-carbon equivalent high-strength gray iron casting and its lost foam casting process, the process flow is as follows:

[0051] Step 1. Foam mold making: use computerized automatic cutting technology to cut foam, then mold the cut foam, spray refractory paint after assembly, dry in a drying room at 55°C after spraying, and repeat drying 4 times to ensure The foam mold does not contain moisture;

[0052] Step 2. Casting process: Put 15cm high sand on the bottom of the sand box, then put the mold into the sand box, and use the rain-type falling sand to cover the mold with the sand box cover. The sand is in seamless contact, and then covered with a plastic film of 6-12 wires, and the sand box is pumped electromechanically through the inner wall hole to achieve a uniform internal negative pressure; then the high-strength gray iron castings are cast at 1450 ° C, and dust removal works during the casting running all the time;

[0053] Step 3. Sand removal: separate the...

Embodiment 3

[0065] A high-carbon equivalent high-strength gray iron casting and its lost foam casting process, the process flow is as follows:

[0066] Step 1. Foam mold making: use computerized automatic cutting technology to cut foam, then mold the cut foam, spray refractory paint after assembly, dry in a drying room at 60°C after spraying, and repeat drying 5 times to ensure The foam mold does not contain moisture;

[0067] Step 2. Casting process: Put 20cm high sand on the bottom of the sand box, then put the mold into the sand box, and use the rain-type falling sand to cover the mold with the sand box cover. The sand is in seamless contact, and then covered with a 12-wire plastic film, and the sand box is pumped electromechanically through the inner wall holes to achieve uniform internal negative pressure; then the high-strength gray iron castings are cast at 1470 ° C, and the dust removal work is always running during the casting ;

[0068] Step 3. Sand removal: separate the sand ...

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Abstract

The invention relates to the field of metal material preparation, in particular to a high-carbon equivalent high-strength gray iron casting and its lost foam casting process; its specific components include: C: 3.9%-4.2%, Si: 1.6%-1.8%, Mn : 1.9%-2.3%, Cu: 0.5%-0.7%, and the balance is iron; a kind of high-carbon equivalent high-strength gray iron casting and its lost foam casting process announced by the invention, the invention discloses a lost foam casting process A method for preparing high-carbon equivalent high-strength gray iron castings. The high-strength gray iron castings of the invention have the advantages of high carbon equivalent, high strength and high rigidity; the invention discloses a refractory coating for lost foam, which has excellent Sand sticking resistance and liquid metal penetration resistance, the formed coating has excellent heat resistance, chemical stability and liquid metal erosion resistance, which can help reduce shrinkage defects on the surface of castings and improve casting quality and pass rate.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a high-carbon equivalent high-strength gray iron casting and a lost foam casting process thereof. Background technique [0002] As a traditional casting metal material, gray cast iron occupies a position that cannot be ignored in foundry production. Although the proportion of gray cast iron in the total global cast iron production has gradually decreased over the years, its position is still difficult to shake. [0003] Lost foam casting coating is one of the key technologies of lost foam casting, and it occupies a very important position in the entire casting process. Lost foam casting coatings must have high temperature gas permeability. In the lost foam casting equipment, the high-temperature air permeability of the coating directly affects the quality of the casting to a large extent. High temperature means that the fire resistance of the coating must be good and the thermal ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04C22C37/10B22C3/00
CPCB22C3/00B22C9/046C22C37/10
Inventor 贾方敏贾炜
Owner 浙江浦江精宇铸造有限公司
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