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A lost foam casting process

A lost foam casting and process technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of rough surface of castings, easy fatigue of workers, high labor intensity, etc., to achieve high quality castings, less scrapped products, work Efficient effect

Active Publication Date: 2019-10-22
安徽垅铸尚工机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, when the lost foam is cast, the surface of the molded casting is prone to roughness; the sand grains tend to contain moisture, resulting in poor quality castings and many scrapped products; and the existing process is labor-intensive and workers are prone to fatigue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A lost foam casting process, the process is composed of the following steps:

[0017] (1) Select polystyrene as the raw material, put the raw material into the foaming machine for foam molding, control the temperature in the mold to 180°C, foam molding time is 6 minutes, cool, the cooling time is 2 minutes, and then demould ;

[0018] (2) bonding the processed model and the runner together to form a model group;

[0019] (3) Spray the strengthening agent evenly on the inner and outer surfaces of the model group;

[0020] (4) Place the sand box on the vibrating table, spread a layer of bottom sand on the bottom of the sand box, the thickness of the bottom sand is 3cm, then put the model group, add sand to fix, seal the sand box with a plastic film and place the sprue cup, Drying while vibrating, the vibration time is 5 minutes, the drying time is 15 minutes, and the drying temperature is 85°C;

[0021] (5) Use a vacuum pump to evacuate the inside of the sand box, and ...

Embodiment 2

[0027] A lost foam casting process, the process is composed of the following steps:

[0028] (1) Select polystyrene as the raw material, put the raw material into the foaming machine for foam molding, control the temperature in the mold at 190°C, and the foam molding time is 8 minutes, cool, the cooling time is 3 minutes, and then demould ;

[0029] (2) bonding the processed model and the runner together to form a model group;

[0030] (3) Spray the strengthening agent evenly on the inner and outer surfaces of the model group;

[0031] (4) Place the sand box on the vibrating table, spread a layer of bottom sand on the bottom of the sand box, the thickness of the bottom sand is 4cm, then put the model group, add sand to fix, seal the sand box with a plastic film and place the sprue cup, Drying while vibrating, the vibration time is 7 minutes, the drying time is 20 minutes, and the drying temperature is 90°C;

[0032] (5) Use a vacuum pump to evacuate the inside of the sand b...

Embodiment 3

[0039] A lost foam casting process, the process is composed of the following steps:

[0040] (1) Select polystyrene as the raw material, put the raw material into the foaming machine for foam molding, control the temperature in the mold to 200°C, foam molding time is 9 minutes, cool, the cooling time is 4 minutes, and then demould ;

[0041] (2) bonding the processed model and the runner together to form a model group;

[0042] (3) Spray the strengthening agent evenly on the inner and outer surfaces of the model group;

[0043] (4) Place the sand box on the vibrating table, spread a layer of bottom sand on the bottom of the sand box, the thickness of the bottom sand is 5cm, then put the model group, add sand to fix, seal the sand box with a plastic film and place the sprue cup, Drying while vibrating, the vibration time is 8 minutes, the drying time is 25 minutes, and the drying temperature is 95°C;

[0044] (5) Use a vacuum pump to evacuate the inside of the sand box, and ...

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Abstract

The invention discloses a lost foam casting process, and belongs to the technical field of lost foam casting. The process comprises the following steps: firstly, raw materials are put into a foaming machine to be subject to foaming forming; secondly, a machined model and a runner are bonded together to form a model set; thirdly, a reinforcer is evenly sprayed to the interior and the outer surface of the model set; fourthly, a sand box is placed on a vibration table, then, the model set is placed on the sand box, sand grains are added for fixing, and drying is carried out while vibration is carried out; fifthly, a vacuum pump is used for carrying out vacuum operation on the interior of the sand box; sixthly, casting liquid is injected from a pouring cup, the model set in the sand box is gasified and disappears, a casting shape is formed, cooling is carried out, and a formed casting is obtained. The casting is easily subject to demolding, the casting surface is smooth, dryness of the sand grains is ensured, casting quality is high, few discarded products exist, the working procedure is easily operated, and the work efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of lost foam casting, and in particular relates to a lost foam casting process. Background technique [0002] Lost foam casting is a full-type casting of foam plastic molds using binder-free dry sand combined with vacuum technology. It combines foam models similar in size and shape to castings to form model clusters. After brushing and drying refractory coatings, they are buried in Vibration molding in dry quartz sand, pouring under negative pressure to vaporize the model, liquid metal occupies the position of the model, solidifies and cools to form a new casting method. [0003] At present, when the lost foam is cast, the surface of the molded casting is prone to roughness; the sand grains tend to contain moisture, resulting in poor quality castings and many scrapped products; and the existing process is labor-intensive and workers are prone to fatigue. Contents of the invention [0004] The technical pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C9/03B22C3/02
Inventor 王培燃
Owner 安徽垅铸尚工机电有限公司
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