EP 0451172 B1 19921111 - CONTROL DEVICE FOR CONTROLLING OVER TIME THE FILLING PRESSURE IN A COMPRESSION MOULDING DIE
Title (en)
CONTROL DEVICE FOR CONTROLLING OVER TIME THE FILLING PRESSURE IN A COMPRESSION MOULDING DIE
Publication
Application
Priority
DE 3844334 A 19881230
Abstract (en)
[origin: WO9007406A1] A control device is useful for controlling over time the filling pressure in a compression moulding die (11) during filling with a paste-like or viscous material, in particular in the manufacture of oxide magnets. A pressure probe (14) measures the pressure in the compression moulding die (11) and sends a corresponding pressure signal to a first threshold value stage (19) and, via a differential element, to a second threshold value stage (21). The outputs of the two threshold value stages (19, 21) are connected to a logic gate (22). When the pressure signal from the pressure probe exceeds a first threshold value of the first threshold value stage (19) and at the same time falls below a second threshold value of the second threshold value stage (21), the logic gate (22) generates a trigger signal which triggers a synchronizer (23) connected to the output of the logic gate (22). The holding time of the synchronizer determines the filling pressure. The optimal filling pressure can therefore be predetermined by precise detection of the time at which the filling pressure is reached. This results in short working cycles, simple predetermination of the pressure and a substantial reduction in the number of defective pieces.
IPC 1-7
IPC 8 full level
B28B 3/02 (2006.01); B28B 13/02 (2006.01); B28B 17/00 (2006.01); B30B 11/00 (2006.01); H01F 41/02 (2006.01)
CPC (source: EP KR US)
B28B 13/02 (2013.01 - KR); B28B 13/021 (2013.01 - EP US); B28B 17/0081 (2013.01 - EP US); B30B 11/005 (2013.01 - EP US); H01F 41/0286 (2013.01 - EP US)
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
WO 9007406 A1 19900712; DE 3844334 C1 19900628; DE 58902725 D1 19921217; EP 0451172 A1 19911016; EP 0451172 B1 19921111; ES 2020059 A6 19910716; JP H04502428 A 19920507; KR 910700130 A 19910314; US 5164202 A 19921117
DOCDB simple family (application)
DE 8900770 W 19891214; DE 3844334 A 19881230; DE 58902725 T 19891214; EP 90900757 A 19891214; ES 8904381 A 19891227; JP 50095790 A 19891214; KR 900701920 A 19900829; US 68791991 A 19910531