GB791417A - An extrusion press having means for severing the extruded product from the discard - Google Patents

Abstract

791,417. Extruding. SCHLOEMANN AKT.- GES. April 10; 1956 [April 16, 1955], No. 10866/56. Class 83 (4). An extrusion press, preferably for making steel tubes, has its extrusion die 4 and die holder 3 carried by a rotatable arm 15 mounted on an axis parallel with the extrusion axis, said arm being also displaceable in the direction of extrusion to permit the extruded product to be severed from the discard. The arm 15 carries a die and die holder at each of its extremities whereby one of them may be changed whilst the other is in operation. The arm is mounted on a shaft 11 slidably connected by splines to a hollow shaft 12 rotatably mounted in the press bolster 1 and driven by a worm gear 34. A pressure member 2 for the die is carried by a second rotatable arm 14 mounted directly on the hollow shaft 12, Fig. 2, whereby it is rotatable with the die, out of the extrusion position. For extruding a steel tube, a heated steel billet is inserted in the container bore'6, a mandrel 33 is pressed through the billet, and the latter is then extruded between the mandrel and die 4 by the press ram 8 having a pressing disc 7. After extrusion the container 5 is retracted, Fig. 2, and the arm 15 carrying the die is. moved with the container-by means. of pressure fluid admitted to a cylinder 37 containing a piston 36 connected by a rod 35 to the solid shaft 11. A saw blade 16a then severs the extruded tube 10 from the discard 9 which adheres to the pressing disc 7. The arm 15 and its die is then moved to the left by reversing the fluid pressure in the cylinder 37, and the two arms 14, 15 are rotated to move the die and die holder away from the container bore whereupon the discard 9 and pressing disc 7 are ejected by the ram 8. The die parts 2, 3, 4 are then cooled and cleaned whilst a new billet is inserted in the container. In another embodiment, Figs. 4, 5 (not shown), one end of the arm 15 is shaped to receive the discard ejected from the container and convey it to a shoot.