A kind of die casting polar coordinate 3D printing equipment and method

Abstract

The invention discloses a pressure casting polar coordinate 3D printing device and method. The device comprises a printing head, a feeding device, a polar coordinate movement control device, a plane coordinate movement control device and a movement control and technology control system, wherein the printing head and the feeding device are used for heat preservation, conveying and quantitative extrusion of aluminum and aluminum alloy in a high-temperature molten state; the polar coordinate movement control device is used for achieving the movement trail of a rotating curve; the plane coordinate movement control device is used for being matched with the polar coordinate movement control device to achieve the linear movement trail; the movement control and technology control system achieves 3D printing of aluminum and aluminum alloy by driving the polar coordinate movement control device, the plane coordinate movement control device, the printing head and the feeding device through two-dimensional contour data. The method achieves precise casting of aluminum and aluminum alloy through polar coordinate 3D printing and thoroughly breaks through a traditional casting production mode.

Description

Technical field [0001] The invention belongs to the technical field of three-dimensional additive manufacturing, and particularly relates to a pressure casting 3D printing device and method. Background technique [0002] In the industrial field, casting is the most basic profession, providing rough or semi-finished products for the machinery manufacturing industry. The traditional production mode of castings is to first make wooden molds, cores or wax molds (for precision casting), and then shape (sand molds) and bake Dry sand, brush paint, pouring, cooling, and then clean the castings, remove the riser, polish, sandblast and other follow-up treatments; as we all know, the biggest problems in the foundry industry are: 1. The labor intensity of workers is high; 2. The working environment is harsh : Dirty, messy, large dust (polished metal powder and modeling sand dust powder); 3. The internal quality of the product is difficult to control and the rejection rate is high. Although t...

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Problems solved by technology

[0002] In the industrial field, casting is the most basic profession. It provides blanks or semi-finished products for the machinery manufacturing industry. The traditional casting production mode is to first make wooden molds, cores or wax molds (for precision casting), and then shape (sand molds) and bake. Dry sand molding, painting, pouring, cooling, and then cleaning the castings, removing risers, grinding, sandblasting and other follow-up treatments; as we all know, the biggest problems in the foundry industry are: 1. The labor intensity of the workers is high; 2. The working environment is harsh : Dirty and messy, large dust (polished metal powder and molding sand dust powder); 3. The internal quality of the product is difficult to control and the scrap rate is high. Although casting has developed to a certain extent in recent years, it is limited by the particularity of this profession And the shortage of labor force in China, the foundry industry is also in a difficult situation

The indirect sintering process also requires complex post-processing processes to be used as metal parts. This method has complex ingredients, troublesome process operations, and easy deformation of the parts, so it is only suitable for small parts and small quantities of production. The mechanical properties (strength) and precision of parts are low Relatively poor, especially the high cost of parts

2. Directly selected laser sintering method: use a single pure metal powder or a powder mixed with high melting point metal powder and low melting point metal powder as the material for sintering, and use high energy laser sintering to directly obtain metal parts. Direct sintering method also Complicated follow-up processing is required, and the density and mechanical properties of the obtained parts are difficult to meet the functional requirements of the parts, and the surface quality is also poor. At present, there are many testers in special materials such as titanium alloys and stainless steel.

To sum up, metal powder SLS technology is just beginning in the industrial field (experimental trial stage). Sintered three-dimensional parts generally have poor mechanical properties, surface quality, density, and accuracy, and cannot be used directly as functional mechanical parts. For the development and application of new materials, new processes and new intelligent equipment

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