Press Part Production

Stamp and Dummy Block

Stamp and Dummy Block are crucial, though small, components that correspond to the size of the extrusion press. The most critical aspect of the press is the linearity and angles of the core and the stamp dummy block group. The efficiency of the press in pulling the profile is most affected by the performance of the dummy block and stamp. Over time, wear is inevitable due to friction, high pressure, and high temperatures, and these parts need to be replaced periodically.

Cavity Group

The cavity group consists of the cavity carrier, cavity sleeve, and the cavity itself. The cavity carrier can be made from welded construction, casting, or forged steel. Among these design options, casting is most commonly used due to cost considerations. The cavity carrier ensures the rigid support of the cavity. Inside the carrier, there is insulating material to prevent the loss of heat from the cavity.

Cavity systems are divided into two types:

• Internally Heated Cavity System
• Externally Heated Cavity System

In presses with externally heated cavity systems, the heating elements are located in the cavity carrier. In presses with internally heated cavity systems, the heating elements are located within the cavity. Due to the operating conditions, the cavity material is typically AISI H11. The core is mechanically fitted into the cavity sleeve with a specific tight fit ratio. The core's primary function is to support the aluminum billet during the press operation, with the billet passing through the core during metal extrusion. Due to the friction with the high-temperature aluminum, the core material may deteriorate over time. To minimize these deformations, the core material is typically chosen as AISI H13 or DIN 1.2367.