Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Consolidation of powder prior to sintering
Reexamination Certificate
2006-12-12
2006-12-12
Jenkins, Daniel (Department: 1742)
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Consolidation of powder prior to sintering
C419S066000, C425S078000
Reexamination Certificate
active
07147820
ABSTRACT:
A method for minimizing the spread of the maximum compression forces in compacting powder, specifically metallic powder, by means of a powder press which has a die-plate, an upper ram, and at least one lower ram which are associated with a die-bore and are respectively operable by a hydraulic press cylinder, and a charging shoe movable on the die-plate along a predetermined path for filling the die-bore with the powder, wherein the maximum compression force of at least the upper ram is measured upon arrival at a predetermined position, the charging shoe, the die-plate, the upper ram and/or lower ram are vibrated at a predetermined frequency and amplitude during the filling operation and/or at the beginning of the compression procedure and, in addition, the filling time or the course of charging shoe motion in time are predetermined, wherein the frequency distribution of the maximum compression force values is determined at intervals and the standard deviation is determined therefrom for the maximum compression force, the standard deviation is compared to a predetermined value, if desired, and the vibration parameters, the course of motion in time and/or the path of charging shoe travel are varied according to a predetermined program until the standard deviation has reached the predetermined value or a minimum.
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Japanese Abstract to Appln No. 04222626—Feed Back Regulating Method In Weight Control for Product of Rotary Tablet Machine, oybkusged Mar. 8, 1994.
Baltruschat Udo
Ehrich Thorsten
Hauschild Ulf
Hinzpeter Jurgen
Pannewitz Thomas
Fette GmbH
Jenkins Daniel
Vidas Arrett & Steinkraus P.A.
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