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Hollow lost foam casting mold and manufacturing method thereof

A lost foam, hollow technology, applied in the field of metal casting molds, can solve the problem of scrapped processing surface

Pending Publication Date: 2018-08-24
河北省同创交通工程配套产品产业技术研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free carbon produced after the pyrolysis of polystyrene accumulates in the casting or on the surface of the casting to form carbon deposits, resulting in the scrapping of the machined surface due to carbon deposit defects

Method used

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  • Hollow lost foam casting mold and manufacturing method thereof
  • Hollow lost foam casting mold and manufacturing method thereof
  • Hollow lost foam casting mold and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] The present invention also provides a method for preparing the hollow lost foam described in the above technical solution, comprising the following steps:

[0051] (1) Use the simulation analysis software to carry out the structural design of the hollow lost foam, and obtain the hollow lost foam model composed of side forms, side forms and middle forms;

[0052] (2) according to the design scheme in the step (1), adopt foaming material to make side mold parts, side mold parts and middle mold parts respectively;

[0053] (3) connecting and assembling the side mold parts, the side mold parts and the middle mold part to obtain the prototype of the hollow lost foam;

[0054] (4) coating the outer surface of the hollow lost foam prototype with a refractory paint layer to obtain the hollow lost foam prototype;

[0055] (5) Vibrating the hollow lost foam refractory prototype in dry sand to obtain a hollow lost foam.

[0056] The invention uses simulation analysis software to...

Embodiment 1

[0067] The structural design of the hollow model is carried out using simulation analysis software. The principle of the structural design is to reduce the amount of foaming material by 20% compared with the solid lost foam of the same size and structure under the premise of ensuring that the pressure resistance of the hollow model is greater than 0.1MPa.

[0068] According to the design scheme, polymethyl methacrylate foam material is used to make side mold parts, side mold parts and middle mold parts.

[0069] The components are bonded and assembled to form a hollow model of the casting.

[0070] Brush the water-based zircon powder refractory paint on the outer surface of the hollow model and dry it to obtain a 3mm thick refractory paint layer.

[0071] Embed the hollow model coated with refractory paint into dry pearl sand and form it by vibration, the vibration frequency is 50HZ, the vibration time is 3 minutes, and the vacuum negative pressure is -0.05MPa.

[0072] Pouri...

Embodiment 2

[0075] The structural design of the hollow model is carried out by using simulation analysis software. The principle of the structural design is to reduce the amount of foam material by 25% compared with the solid lost foam of the same size and structure under the premise of ensuring that the pressure resistance of the hollow model is greater than 0.1MPa.

[0076] According to the design scheme, polymethyl methacrylate foam material is used to make side mold parts, side mold parts and middle mold parts.

[0077] The components are bonded and assembled to form a hollow model of the casting.

[0078] Brush the water-based zircon powder refractory paint on the outer surface of the hollow model and dry it to obtain a 3mm thick refractory paint layer.

[0079] Embed the hollow model coated with refractory paint into dry pearl sand and form it by vibration, the vibration frequency is 40HZ, the vibration time is 4 minutes, and the vacuum negative pressure is -0.04MPa.

[0080] Pouri...

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Abstract

The invention provides a hollow lost foam casting mold. A hollow structure which is in a specific shape and layout is arranged inside the mold, so that the application amount of a foam material is reduced, and the breathability is improved; on the premise of not influencing the use of an obtained casting, the surface recarburization of the obtained casting is significantly reduced, the mechanicalperformance and surface performance of the casting are improved, and the yield of the casting is improved. The embodiment result shows that compared with a solid lost foam casting mold, the heart recarburization amount and the surface layer recarburization amount of the casting manufactured with the hollow lost foam casting mold are significantly lowered. The invention further provides a manufacturing method of the hollow lost foam casting mold. The manufacturing method is easy and convenient to perform and easy to implement.

Description

technical field [0001] The invention relates to the technical field of metal casting molds, in particular to a hollow lost foam and a preparation method thereof. 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] In the prior art, expanded polystyrene is generally used to make models, and then directly embedded in dry sand, vibrated and compacted, and negative pressure is drawn to form EPS solid molds. When molten steel is poured into this solid mold, the polystyrene is pyrolyzed and gasified, and the molten steel fills the sp...

Claims

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Application Information

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IPC IPC(8): B22C7/02B22C9/04
CPCB22C7/026B22C9/04
Inventor 金家康赵宏图刘建彬郭勇刘岳贾雷雷李翠陈少静黄基平季文涛徐骞刘欢赵国猛
Owner 河北省同创交通工程配套产品产业技术研究院
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