![]() ![]() Below we listed the main difference in the steps of casting: The advent of SLA has triggered a revolution in the casting industry and people name it SLA Quick Precise Casting Method. Producing high-accuracy, isotropic and watertight objects with excellent qualities and smooth surface finish.Shortening the lead time to a large extent.SLA printing technique is extensively used in plenty of fields as it’s distinctive in: The principle is focusing a UV laser on photopolymer resin and the resin, which is sensitive to ultraviolet light, will be solidified and form a single layer and ultimately make up the body of a three-dimensional solid object. It is a type of 3D printing technology and targets at creating models, prototypes, patterns, and production types. SLA is also known as stereolithography apparatus, optical fabrication, photo-solidification or resin printing. During dewaxing, the heated wax expands and increases the inner pressure, which is possible to lead the explosion of the investment mold.The pattern mold must be subtly made and it’s not convenient to modify and verify design plans.The pattern mold requires special tools and the building process of which may take 8-20 weeks and cost $50,000 – $100,000, depending on the complexity of the parts. ![]() There are some key points among those steps: Saw off the casting part from the tree and conduct the finish process.Remove the investment shell from the casting part by hammering, basting or other methods.Heat the investment mold to remove moisture and residual wax, then pour the material into the mold by gravity or air pressure.Heat the investment mold rapidly so that the wax can melt and drain quickly to minimize the inner stress and make space for the wax expansion.When the ceramic shell drys out, the whole part becomes an investment mold. Repeatedly submerge the tree into a ceramic slurry and sand alternately to form a rigid and thick outer shell.Assemble the wax pattern onto a “wax pattern tree” with a wax sprue (a gate to pour the liquid metal material in).Inject the molten wax into the pattern mold and wait for its cooling and hardening into a wax pattern.The process of investment casting has been standardized and can be summarized in the below steps: The value of investment casting embodies in its ability to produce parts with accuracy, repeatability, versatility in abundant choices of high-performance metals and alloys. Its name derives from the process that wax pattern is firstly invested (surrounded) with a refractory material like ceramic, and then the pattern will be melt or vaporized in the furnace. Investment casting is also called precision casting and lost-foam casting. The Traditional Investment Casting Process It delivers changes in the manufacturing industry by reducing lead time, eliminating high tooling costs, producing parts with flexible and complex geometry structure, etc. In recent years, 3D printing becomes increasingly popular in producing the pattern for the expendable investment casting. It is based on the lost-wax casting method, which is one of the oldest known metal-forming techniques, and developed to be a widespread modern casting process. Investment casting can be traced back to ancient Egypt and China 5,500 years ago. ![]()
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