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Practical investment casting technology
A friend asked me on WeChat, "Professor Venda, I've encountered a problem. Why does the strength of the mold shell decrease after firing, and it breaks easily when poured, even after half an hour without casting? The red shell is fine." This is actually a question about the high-temperature strength and residual strength of the mold shell. Today, I'll specifically discuss my views on this issue. I've actually researched a lot of materials, and the book *Practical Investment Casting Technology*...
Analysis and Improvement of Shell Defects This issue discusses the problem of shell defects 1. Definition of fleshy: There are protruding parts on the surface of the casting, and the surface is rough, mostly appearing at the corners and planes of the casting. Note: If the casting has fleshy parts, there will inevitably be flake or strip defects and sand hole defects, 2. Cause: The coating surface is detached or peeled off, a 3. Specific reasons and possible improvements: (1) The front and back...
Development of Titanium Alloy Precision Casting Technology
To meet the demand for high-performance metal structural components in the upgrading of aerospace vehicles, component production technologies and materials are constantly evolving. Titanium alloys, with their low density, high specific strength, strong corrosion resistance, and high-temperature resistance, are widely used in critical load-bearing structural components in the aerospace industry, and their use continues to grow. However, the production of titanium alloy parts presents...
Investment casting process—the problem of shell delamination
A few days ago, a friend asked me if I had any materials on shell delamination. I thought he had a problem with some product, but actually, he wanted me to share information on shell delamination. And sure enough, we encountered such a shell delamination issue today. Here's what happened: After firing, when washing the shell of a product, we found that the inner surface layer had severely peeled off. No matter how we washed or poured it, we couldn't clean the shell properly. So, we...
A friend posted two photos with the question: "The disc tray holes are all reinforced with metal. Could you please tell me how to prevent this during the casing manufacturing process?" This is actually a very simple casting defect, and its cause is also quite simple. However, you might not be able to figure it out without careful analysis. But if you regularly read my WeChat official account, analyzing the cause of such defects will be very easy, so please follow my WeChat...
How to Reduce Porosity Defects in Cast Al-Si Alloys
Hello everyone, I'm Venda from China. I've been working in the lost wax investment casting industry for over 20 years. Today, I'd like to briefly discuss how to reduce porosity in cast Al-Si alloys. If you have any insights, please leave me a message. My WhatsApp account is: +8618562112686. Sr modification is a key process in the casting of hypoeutectic Al-Si alloys. However, Sr modification can increase porosity in castings. This is partly because the introduction of Sr increases the Al-Si...
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