A precision casting process based on 3D printing pattern

Abstract

The present invention is a precision casting process based on 3D printing pattern, comprising the following steps: S1, printing pattern: use 3D printer to print pattern; S2, pattern splicing; S3, pattern leak test; S4, splicing pouring system; S5, pattern surface Polishing to make the surface of the pattern smooth; S6, shell making: the pattern is made into a mold shell by slurrying, sanding and drying; S7, roasting and demoulding; S8, cleaning the inner cavity of the mold shell: by pouring balls into the inner cavity of the mold shell Shot, cleaning the inner cavity of the mold shell by shot blasting; S9, casting: casting by negative pressure suction casting method; S10, post-processing: the shell mold is subjected to shell vibration, cutting, gate grinding, and sandblasting. The invention does not require mold opening and wax injection, which greatly reduces the manufacturing cost of a single small batch of products, and the obtained castings have high dimensional accuracy, surface finish and casting consistency, and the process is simplified, the production cycle is short, and it is suitable for small batches with complex Production of metal castings.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and relates to a casting process, in particular to a precision casting process based on 3D printing patterns. Background technique [0002] At present, there are 3 mainstream methods of 3D printing investment casting metal process: [0003] 1. Use SLS laser sintering PS powder printer to print the wax pattern, then dip wax on the surface and polish, then use gypsum to make a mold, and cast aluminum water after baking. [0004] 2. Use a SLA photocuring printer to print a photosensitive resin wax model, and then make a shell to obtain a mold shell and then bake and cast it. [0005] 3. Use FDM printer to print special casting resin and paraffin material for shell making, roasting and casting. [0006] There are many problems, defects and imperfections in the above manufacturing methods, as follows: [0007] 1. Poor dimensional accuracy: SLS sinters PS powder, and the dimensional error ...

AI Technical Summary

Problems solved by technology

[0007] 1. Poor dimensional accuracy: SLS sintered PS powder has relatively large dimensional error. In addition, due to the use of a solid model, the amount of gas generated during sintering is also relatively large, which further leads to a decrease in accuracy, and the final casting has poor dimensional accuracy.

[0008] 2. Expensive equipment and materials: The price of the above-mentioned SLS and SLA 3D printers ranges from tens to millions. The special casting resin and paraffin materials used are priced at 500 to thousands of yuan per kilogram, which seriously restricts 3D printing products. Cost reduction; on the other hand, the cost of plaster molds is also very high, which is 10 times that of sand casting, and the amount used is much larger than that of sand casting

[0009] 3. Poor surface precision and low casting success rate: Among the above casting methods, SLA and FDM printed wax materials have relatively large ash content. Even after cleaning and air blowing, it is difficult to achieve an ideal surface Smoothness directly affects the quality of castings, which is the biggest problem at present

[0010] In response to the above defects, the current solutions of various manufacturers are to consider the printing materials, and to solve the above problems by developing and manufacturing more pure printing materials with less ash content, but this will further increase the cost of materials and technical difficulties. also improve

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