aluminum extrusion with graphite dummy block h36

This chapter covers the semipermanent press tooling: dummy blocks, stems, containers, container liners, and their repair, maintenance, and lubri ion. Fixed Dummy Blocks Most aluminum extrusion presses are now fitted with fixed dummy blocks. They offer several advantages over loose dummy blocks: Operator involvement is virtually eliminated.

graphites usage on the popular walking beam handling system can be reduced Figure 1 . Problem: Carbon graphite blocks and wood are used on the transfer, stationary, and/or walking beams of aluminum extrusion handling tables. These materials are used due to the extreme temperatures of aluminum extrusions after profiles have been extruded.

1. Extrusion cylinder and dummy block wear out seriously, leading unmatched sizes between the extrusion cylinder and dummy block of which the diameter difference exceeds the allowable value 2. Extrusion cylinder and dummy block is unclean with oil, moisture, graphite and so on 3. Lubricants contain water 4.

In extrusion, a preheated cylindrical aluminum billet is pressed through a steel die with a pressing ram . At the end of each extrusion cycle, the pressing ram, the socalled dummy block, must separate instantly and cleanly from the billet without pulling the extruded section from the die, as this will cause blisters in the profile.

Under direct extrusion, the high friction caused by steels at higher temperatures is reduced using molten glass as a lubricant while oils with graphite powder are used for lubri ion for low temperatures. The dummy block is used to protect the tip of the pressing stem punch or ram in hot extrusion.

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THE EXTRUSION PROCESS PRINCIPLE Container Electrostatic Powder Coating Billet Dummy block Aluminum billet Dummy block is pressed against the billet Billet is pushed through the container at 500 C Billet will be pressed through the mold and achieve the final shape Dummy block and billet have to be protected by lubricant because

The dummy block attached with the stem shears an aluminum ring from the container during each return stroke, and this has to be removed from the stem Ref 3 . Indirect Extrusion In indirect extrusion, the die at the front end of the hollow stem moves relative to the container, but there is no relative displacement between

In addition to the specific range of lubricants intended for aluminium extrusion, CONDAT also offers: Cutting fluids for shearing profiles after extrusion. Maintenance products: Graphite varnishes for dies and dummy blocks: G Start. Fireresistant hydraulic fluids: CONDAT D. Hightemperature heattransfer fluids: for temperature control of ...

At the end of each extrusion cycle, the dummy block must separate cleanly from the butt, without removing the section from the die, and without breaking the mandrel cone in the dummy block. Aluminum sticking can be a serious problem, especially when using the softer alloys, and with larger billets. It is absolutely essential, therefore, to ...

aluminum alloy temper designations, the typical mechanical properties of representative wrought and cast aluminum alloys are presented in Tables 1 and 2, respectively. Table 1 Typical mechanical properties of wrought aluminum alloys a Tension Elongation, Alloy and temper Strength, ksi Ultimate Yield In2in. 1 16 in. thick specimen In 4D ...

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