By Robert Havemann, John Schmitz, Hiroshi Komiyama, Kazuo Tsubouchi
The MRS Symposium continuing sequence is an across the world known reference compatible for researchers and practitioners.
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Extra info for Advanced Metallization & Interconnect Systems for Ulsi Applications in 1996: Materials Research Society Conference Proceedings
Pressing in order to achieve required green density and part thickness. 3. Withdrawal of the upper punch from the compact: Here the risk of cracking of green parts is felt. As the upper punch withdraws the balance of forces in the interior of the die ends. g. flange with a hub, the elastic spring back of the lower punch is the greatest danger. Other problems are protrusions required on the upper face of the part. In the case of thin parts with large projected area, cracking is common due to elastic spring back of the lower punch and the part itself.
In the cam type of mechanical press, pressing speed, timing, and motion are controlled by changing the contours of the cams or cam inserts. 3 illustrates a general view of the automatic mechanical press. Rotary Presses A rotary press is a mechanically operated machine, which uses a number of identical sets of tools to produce parts at high production rates. In this machine, the tool sets normally called tool stations, are held in a head or a turret which rotates continuously. The rotation of the head pulls the upper and lower punches past fixed surfaces called cams, and a set of pressure rolls that impart compression force from above and below.
Apparent Density and Fill Ratio: The density of the finished part is usually specified. Tooling must be designed to provide enough fill to produce a part to the required compacted density. The ratio of apparent density of powder to green density is used to find the fill depth. The fill ratio accuracy can be improved further if compacts are made at the desired rate of speed for producing green parts on the press. The apparent density is affected by the time allowed for the tool cavity to fill. The true fill ratio should be based after including all the variables.
Advanced Metallization & Interconnect Systems for Ulsi Applications in 1996: Materials Research Society Conference Proceedings by Robert Havemann, John Schmitz, Hiroshi Komiyama, Kazuo Tsubouchi