公开(公告)号：US3719445A

公开(公告)日：1973-03-06

申请号：US3719445D

申请日：1971-05-10

Applicant: DANLY MACHINE CORP

Inventor： SINDELAR W

IPC: B30B1/28 ,  B30B15/28 ,  B29H5/24

CPC classification number: B30B1/28 ,  B30B15/284

Abstract: A PRESS UTILIZING THE PRESS STRUCTURE AND CONTROLS OF A METAL WORKING PRESS BUT WHICH IS ADAPTED FOR COMPRESSION MOLDING OF LARGE PLSTIC PARTS ON A PRODUCTION BASIS. MEANS ARE PROVIDED FOR DRIVING THE PRESS SLIDE SLOWLY INTO BOTTOM DEAD CENTER (TO BE REFERRED TO HEREIN AS "DEAD CENTER") POSITION FOLLOWING RAPID DESCENT, FOR DEVELOPING A HIGH MOLDING FORCE, WHICH MAY BE SUBSTANTIALLY GREATER THAN THE NOMINAL RATING OF THE PRESS, AND FOR SUSTAINING THAT FORCE DURING CURING INTERVAL. PRESSURE IS REDUCED TO A LOWER LEVEL TO PERMIT REESTABLISHMENT OF LUBRICATION AT THE PRESS BEARINGS PRIOR TO MOVING THE SLIDE OUT OF ITS DEAD CENTER POSITION FOR COMPLETION OF THE CYCLE. THE HYDRAULIC OVERLOAD RELEASE DEVICE CONVENTIONALLY USED IN ESPECIALLY CONTROLLED TO ENABLE DEVELOPMENT OF HIGH MOLDING PRESSURE. IN ONE EMBODIMENT MOLDING PRESSURE IS DEVELOPED BY SLOW MOVEMENT OF THE SLIDE INTO ITS DEAD CENTER POSTION. IN ANOTHER EMBODIMENT THE OVERLOAD DEVICE IS DEPRESSURIZED SO THAT FINAL MOVEMENT OF THE SLIDE INTO DEAD CENTER OCCURS WIITH ONLY LIGHT LOADING, FOLLOWING WHICH THE REQUISITE PRESSURE IS DEVELOPED BY PUMPING UP THE HYDRAULIC OVERLOAD RELEASE WITH THE SLIDE STATIONARY. IN BOTH CASES MEANS ARE PROVIDED FOR BLEADING FLUID FROM THE OVERLOAD RELEASE MECHANISM TO RELEASE THE PRESSURE ON THE SLIDE BEFORE THE SLIDE BEGINS TO MOVE OUT OF DEAD CENTER.

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