Epc technology is a method of casting metal parts with the same shape and shape, which is made of foam plastic into a solid mold with the same structure and size as the parts. It is dipped in refractory coating, dried, sand shaped, vibrated and compacting, and then poured into metal liquid to vaporize and disappear when the shape is heated.

There are mainly six kinds of epc technologies:

1. Pressure epc

Pressure is epc epc technology combined with pressure solidification technology of casting technology, it is in the pressure filling with sand box, pouring liquid metal to make foam gasification disappeared, rapid filling and sealing pressure, and access to a certain pressure of gas, make the liquid metal solidification under pressure molding casting method.

The characteristics of this casting technology are that it can significantly reduce the casting defects such as shrinkage cavity, shrinkage porosity and porosity, improve casting density and improve casting mechanical properties.

2. Vacuum low pressure epc

Vacuum low pressure epc technology is a new technology which combines negative pressure epc with low pressure reverse gravity pouring.

The characteristics of vacuum and low-pressure epc technology are as follows: it integrates the technical advantages of low-pressure and vacuum epc, completes the mold filling process under controllable air pressure, and greatly improves the mold filling capacity of the alloy. Compared with die casting, the equipment investment is small, the casting cost is low, and the casting can be strengthened by heat treatment. Compared with sand casting, the casting has high precision, low surface roughness, high productivity and good performance. Under the action of anti-gravity, the direct gate becomes the filling and shortening channel, the casting temperature loss is small, liquid alloy is fed and solidified under controllable pressure, and the casting system of alloy casting is simple and effective, with high yield and compact structure. Vacuum low pressure epc casting with low pouring temperature is suitable for many kinds of non-ferrous alloys.

3. vibro-epc

Vibration of epc technology is applied in the epc process a certain frequency and amplitude of vibration, the casting under the effect of vibration field of solidification, the lost foam casting solidification process of molten metal in the imposed vibration time, vibration make the liquid phase and solid phase produces relative motion, and make the dendrite broken, increasing liquid crystal core, * * * all castings solidification organization refinement, feeding, mechanics performance improvements.

This technology makes use of the ready-made compact vibration table in epc, and makes the metal liquid produce nucleation under the dynamic excitation through the mechanical vibration generated by the vibration motor, so as to achieve the purpose of refining the structure, which is a simple method with low cost and no environmental pollution.

4. Semisolid epc casting

Semi-solid epc technology is a new casting technology which combines epc technology with semi-solid technology. Because the characteristic of this technology is to control the relative proportion of liquid and solid phase, it is also called transformation control semi-solid forming.

This technique can improve casting density, reduce segregation, improve dimensional accuracy and casting properties.

5. Lost form shell casting

Epc shell casting technology is a new method of investment casting and epc casting. This method it is made of foaming mould and parts shape of foam plastic shape surface coated with several layers of refractory material, wait for after its hardened and dry, will be one of the bubble shape type combustion gasification disappear, made of a plastic shell, the roasting, then pouring, and high dimensional precision casting method of a new type of precision casting.

It has the characteristics of large pattern size and high precision in epc, as well as the advantages of shell precision and strength in investment precision casting. Compared with ordinary investment casting, it is characterized by the low cost of foamed plastics, convenient combination of appearance and adhesion, easy vaporization and disappearance, which overcomes the problem of deformation of investment casting caused by easy softening of investment casting materials, and can produce various alloy complex castings of larger sizes.

6. Lost form suspended casting

The technology of epc suspension casting is a new practical casting technology which combines epc process and suspension casting. The technical process is that after the metal liquid is poured into the casting mold, the foamed plastic appearance is vaporized, and the suspension agent mixed in the riser model (or the suspension agent is placed in a specific position of the appearance, or the suspension agent is made into the foamed appearance with EPS) has physical and chemical reaction with the metal liquid, so as to improve the whole (or part) microstructure and performance of the casting.

The characteristics of epc technology, such as low cost, high precision, flexible design, clean and environmental protection, and suitable for complex castings, are in line with the general trend of casting technology development in the new century.