Lost foam casting (EPC), also known as negative compaction casting, uses a foamable raw material to form a foam type. According to the melting capacity, several or even thousands of models are linked into a model beam, coated with a special coating, and dried. Dry sand filled with a binder-free, moisture-free, and other additive is buried in the negative pressure sand box. After the microseismic treatment, the metal liquid is poured under a certain negative pressure, thereby obtaining a smooth surface, precise dimensions, and no burr. Precision castings.
Lost foam casting has the following features:
1. The scope of application of the process is applicable not only to cast steel and cast iron, but also to cast copper and cast aluminum. It is applicable not only to castings with simple geometric shapes, but also to castings that are difficult to complete in ordinary castings. Many EPC processes can be easily accomplished with many open-end, multi-core, and complex-shaped castings that are difficult to machine.
2. The EPC process can realize the pouring under micro-seismic conditions, promote the formation of special requirements for the metallurgical structure and the arrangement of metal fibers, which will help improve the mechanical properties of the castings.
3, EPC process is a combination of casting in dry sand, castings easy sand removal, temperature synchronization, so you can use waste heat for heat treatment。 In particular, the water edge treatment of high-manganese steel castings and the solid-smelting treatment of heat-resistant steel castings have very good results, saving a lot of energy, shortening the processing cycle, and the economic benefits are significant。
4, the process is simple, suitable for industrial production, investment in sand casting 30-60%, with less than the cost of ordinary casting can be compared with the wax mold high-precision castings. Wax casting is only suitable for small castings. EPC can finish any large casting according to melting ability.
5, easy to grasp, canceled the modeling process procedures, ordinary workers with a little cultural knowledge, can be trained into a skilled EPC mechanic within five days. Therefore, the EPC process is particularly suitable for companies and regions that are not available to traditional styling workers. Solve the problem of enterprise recruitment difficulties.
6。 The labor intensity of workers has been greatly reduced, and the number of workers has been greatly reduced。 The industries dominated by male workers can become industries dominated by female workers, changing the gender structure of employment。
7, the operating area occupies a small area. Regardless of the number of tons produced per year, the main operating procedure covers an area of 300-400 square meters. The production capacity is no longer constrained by the size of the plant. How much melting capacity can accomplish much output.
8. The operating environment has improved significantly. EPC technology can make all the sand circulation loop, dust in the air, no sand on the ground, workers can wear white coats to complete dirty and tired work in the past.
In foreign countries, the EPC process is known as the 21st century green casting process - advance process, also known as a revolution in the history of casting。 In recent years, international and domestic EPC processes have become hot spots in the foundry industry。 Since our factory developed EPC technology in 1988, we have constantly explored and innovated to form the theoretical basis and process specification for vanishing models of Jining。 In the range of Jining's lost foam, the lost foam casting technology has entered a mature stage of development。