About Us
We Manufacture for People
Investment Casting
Overview
Investment casting, also called lost wax casting, is a process in which a pattern, also known as a master or master pattern, traditionally made of wax, is covered with a ceramic slurry. The wax pattern is normally produced with injection molding. The wax is melted out of the ceramic shell, which is pre-heated before molten metal is poured into it. After the metal cools, the ceramic is vibrated and blasted from the metal casting. Investment casting generally provides higher accuracy (+/- 0.005 inch (0.127 mm) tolerance is normal) and surface finish (typically 125 micron RMS (3.125 micron Ra)) than other casting processes. It is generally used in applications that have relatively low production quantities and changing product designs.
Application Outline
The wax patterns used in investment casting are typically produced using an injection molding process. Tooling cost ranges from $1,000 to $25,000 and lead time to produce tooling is approximately two months. A big problem for many investment casting foundries is that they are not able to produce prototype castings until the injection mold is completed. At this time, problems are often discovered, such as interference with other components in an assembly. Additional time and money must be invested to fix the injection mold. In a worst-case scenario, it may be necessary to scrap the original tool and start over from scratch. Another problem with wax patterns is that their complexity is limited by what is feasible from an injection mold in the allotted time.
Services We Provide
● Surface treatment: Electrolysis, pickling, vibration grinding, polishing, shot blasting, sandblasting, painting, plastic spraying, electroplating, and other processing can effectively solve the surface treatment requirements of the product in one stop.
● Precision machining: The factory currently has 12 CNC vertical machining centres, which can process products with a maximum size of 800 * 800 * 600, and the accuracy can reach 0.01mm.
● Heat treatment: solid solution, quenching and tempering, carburizing, nitriding, nitriding, alloying, etc.
Our History
• In 1996, the first generation of family JIANG established a casting plant called “Honor Hardware” in Yunlong Township of Ningbo City. This is the predecessor of Sino World. It was the water glass investment casting plant.
• In 2010, silica sol investment casting process was introduced to completely substitute the water glass investment casting. A process upgrading and transformation was thus completed. In the meanwhile, the company introduced ISO9001: 2008 Quality Management System, passed its certification, and started implementing the system in the plant.
• In 2015, New foundry and machining was founded. In the same year, the vacuum casting process was introduced and the company passed the certification of TS16949: 2009 Quality Management System.
• In 2016, simulated casting software was introduced to initialize a technical innovation in the company.
• In 2017, the company was upgraded to IATF16949:2016 and ISO9001: 2015. In the meantime, a new precision CNC machining workshop was completed to undertake a machining business.
Why Choose Us
1. Sino World Casting has been involved in molten film casting for 26 years. Serving various industries, including medical, mining, automotive, etc.
2. The materials used to produce the castings are of the highest quality and meet the most stringent material standards, including AMS, ASTM, etc.
3. According to your requirements for casting products, we will design specific material chemistry and mechanical specifications. Make the best casting products.
4. We have designed the most efficient investment casting solution to reduce your unnecessary cost. Make your product competitive.
5. The professional technical team allows us to produce castings of almost any degree of complexity.
6. By having a mature quality control system, we can provide unparalleled quality and dimensional tolerances
Customer Story
We Aim to Build a Better World
RLM Industries is a leading supplier of investment castings to the military, construction, food processing and handling, and automotive industries. Recently a major manufacturer of components and assemblies for the military found itself in serious danger of missing critical delivery deadlines when the foundry they had been using couldn’t produce investment castings that met drawing specifications. The original foundry used injection molding to make wax patterns. RLM’s customer needed a faster and less expensive solution to the problem and asked RLM if it could help.
RLM began the project by modifying the CAD model provided by the customer. These revisions were completed in one day, and at the end of the day, engineers set up their Stratasys machine to produce an FDM prototype. The prototype was provided to the customer for assembly review. The customer found an interference in the assembly. RLM made some modifications to the CAD model and printed another prototype, which was provided to the customer. The customer approved the design.
RLM then moved immediately into production of the first prototype castings, using the FDM prototypes as patterns to produce investment castings. The prototype castings matched the patterns perfectly, and the customer approved them. The production of the first prototypes was also used to refine the casting process, primarily for evaluating the gate location.
“Using Stratasys equipment and technology, we were able to build patterns in less than a day,” said Rick Meachum, vice president of sales for RLM. “The patterns were then expedited through our process, and in seven days we produced perfectly matching gear set castings that met drawing requirements and specifications and were functional as part of the assembly. The castings were used for a test launch, and we now have time to build hard tooling with all parties confident in the knowledge that the part design and dimensional attributes are correct for a large quantity production order.”
