The most important and critical process in precision investment casting is the shell making process. скачать в хорошем качестве

The most important and critical process in precision investment casting is the shell making process.

The main and crucial process in investment casting is the shell-making process. In recent years, we have made great technological innovations in the shell-making process, using advanced technologies from both domestic and foreign sources. As a result, we are ahead of 90% of our domestic competitors in terms of quality, cost-effectiveness, and environmental friendliness, and have achieved a breakthrough in production volume. Our products are mainly concentrated in the fields of engineering machinery, railway vehicles, automobiles, and energy industries, with an annual output exceeding 2,000 tons. Our orders are spread across many countries such as North America and Eurasia, with a return order rate of 100%. Firstly, we replaced the water glass binder with silica sol, so there is no need to use heavily polluted ammonium chloride or aluminum chloride liquid as the hardening solution. This has not only improved the working environment but also greatly improved the quality of the investment castings. Secondly, we have successfully solved the problem of long air-drying time in the silica sol shell making process. It used to take 8 hours per layer to dry, but now it only takes an hour per layer. This significantly improves the production efficiency, while also greatly improving the strength of the shell. Meanwhile, our silica sol process has broken through the limitation of being only used for investment castings of stainless steel, high-alloy steel, and small parts. Nowadays, we can make investment castings of carbon steel, various alloy steels, and even 50kg precision castings. The cost is also much lower than that of traditional silica sol production, especially in regards to the problem of high cost of using silica sol as a binder for carbon steel and alloy steel. Another advantage is that all shell-making processes are completed by robotic arms, including the automatic air-drying process. Up to eight layers of shells are possible, each with its own robotic arm and drying chamber, controlled automatically between each layer to complete the shell-making process. This avoids the unpredictability of human operators. Finally, the shell made by our modified shell-making process is significantly stronger than those made with ordinary silica sol binders making shell process . The thickness is almost half that of the water glass shell, increasing the breath ability of the shell and thus contributing to higher surface quality of the investment castings.