A closed-die forging press
is made out of a massive stud frame, a lifting unit and a changeable tool. The lifting unit of most closed-die forging presses
is mechanically, hydraulically or pneumatically operated. Pneumatic closed-die forging presses can achieve very high clock rates. Hydraulic closed-die forging presses can enforce very high levels of pressure, and are therefore more suitable for large products. The advantage of a closed-die forging press is that highly durable technical products can be produced. Closed-die forging is not only a safe and efficient process to shape thick-walled products, but it is also used to temper the materials. Cast and annealed products are compressed using high pressure. After the pouring, the course crystals of the metal and made smaller using closed-die forging, which increases the elasticity of the product. The closed-die forging process is generally a hardening process for products, which occurs in an oil bath. This additionally increases the resistance of the products. The disadvantage of a closed-die forging press is that it requires a lot of energy to operate.