| 摘要 |
1,188,677. Extruding. LOEWY ROBERTSON ENG. CO. Ltd. 31 Oct., 1968 [1 Nov., 1967], No. 49693/67. Heading B3P. An extrusion press has a die slide 14 supporting a die 34 or die assembly 30 and movable transversely of the extrusion axis by hydraulic piston-cylinder assembly 16 between a position with the die on the extrusion axis and a position adjacent a die-changing mechanism 50 including a carriage 52 and a further hydraulic assembly to displace the die between the slide and the carriage. The press is hydraulic with a platen 10 with guides 22, 24 for the slide. A latch 40 holds the die assembly in the slide and a plate 42 on the slide serves to close the container 44 during die-changing. The die 34 is supported by bolsters 36, 38 and the rear bolster 38 co-operates with the platen 10 to shear the extruded product. Alternatively, the produce is sheared by a shear blade 48. The carriage 52 is moved on tracks 56 by an hydraulic motor. The further hydraulic assembly comprises piston-cylinder assemblies 60, 70. The assembly 60 is mounted on the slide 14 and serves to push a die assembly 30 from the slide on to the carriage. The other assembly 70 is mounted on a bracket 74 at the side of the tracks 56 and serves to push a die assembly from the carriage into the slide. The carriage accommodates at least two die assemblies and is moved into a heating chamber 80 with one die 130 during use of the other die 30. The chamber has an insulated lining and heating elements 84 in the form of gas burners, resistance or induction heaters. The door 86 of the chamber may be automatically controlled by the movement of the carriage, by limit switches. The door may also be locked closed if the temperature is too low. The carriage may be designed to support two die assemblies by an overhead supporting structure. |
