Lost sand casting process based on photocuring rapid forming
A sand casting and light curing technology, applied in manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of low efficiency, difficult casting model processing, long cycle, etc., to improve dimensional accuracy, solve the problem of single manufacturing method, The effect of improving the level of technology
Inactive Publication Date: 2010-06-02
中国航天科技集团公司第九研究院第十六研究所
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[0004] The purpose of the present invention is to propose a disappearing sand casting process based on light-cured rapid prototyping, which solves the technical problems of existing casting models such as difficult processing, long cycle time, and low efficiency.
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[0031] The casting process of the present invention mainly includes processes such as prototype making, molding, resin ablation, pouring, cleaning, etc., see figure 1 ; Now take the frame casting blank with complex structure as an example, see figure 2 , its body casting process includes:
[0032] a. Prototype:
[0033] Use a computer to make a three-dimensional model of the body, enlarge the finished three-dimensional model by 100.1% to 100.4%, and save it as a file in .stl format (.stl is the file format of a triangular surface); then use the SPS600 rapid prototyping machine Make solid resin prototypes and verify their dimensional accuracy.
[0034] For the convenience of molding and sand mold cleaning, the present invention divides the frame into upper and lower parts, see Figure 3 to Figure 6 . In order to reduce the force exerted by the thermal expansion of the photosensitive resin on the sand mold and prevent the sand mold from cracking and failing, it is necessary...
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Abstract
The invention relates to a lost sand casting process based on photocuring rapid forming, which comprises the following steps of: 1, fabricating a model: fabricating a three-dimensional model by using a computer, amplifying the fabricated three-dimensional model in a proportion of 100.1-100.4 percent, storing the amplified three-dimensional model as a file with .stl format; and then fabricating a solid resin model by using a rapid forming machine; 2, molding: taking the traditional clay bonded sand, fabricating a sand mould by adopting a light ramming molding process; 3, eroding resin at a temperature of 450-650 DEG C to enable the resin model to be fully combusted, wherein the erosion temperature insulation time is no less than 3h; 4, pouring: pouring a casting by adopting various universal pouring methods; and 5, cleaning: removing a flow gate, and deburring. The invention solves the technical problems of large processing difficulty, long period, poor efficiency and the like of the traditional casting model. By adopting the invention, the production period of the casting is shortened, the complexity of a castable structure is improved, and the application range of the sand casting is expanded.
Description
technical field [0001] The invention relates to a sand casting process, in particular to a sand casting process using the disappearance method. Background technique [0002] Frame casting blanks such as figure 2 As shown, the maximum external dimension is 200×190×110mm, and its external structure is fully processed. The internal structure is mainly composed of five interconnected cavities. Except for the cavity mounting surface, the rest of the surface is not processed. The internal dimensions of each cavity The accuracy is ±0.5mm. The production cycle of traditional wooden molds in the casting process of frame castings is 15 to 20 working days, which has the problems of difficult processing, long cycle and low efficiency. [0003] Light-curing rapid prototyping is one of the advanced manufacturing technologies developed in the past ten years. It can quickly generate actual objects directly from 3D CAD data. It has high precision and fast speed, and is very suitable for th...
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IPC IPC(8): B22C9/04
Inventor 王永刚
Owner 中国航天科技集团公司第九研究院第十六研究所