| 摘要 |
<p>PCT No. PCT/GB95/01654 Sec. 371 Date Jul. 9, 1996 Sec. 102(e) Date Jul. 9, 1996 PCT Filed Jul. 13, 1995 PCT Pub. No. WO96/02335 PCT Pub. Date Feb. 1, 1996Continuous extrusion apparatus having a rotating circumferential groove (72) carrying feedstock to a passageway formed between the groove and arcuate tooling extending into the groove has the groove formed on the central region (72) of a cylinder (2). The cylinder (2) is formed with end bosses (16, 18) which are supported in bearings (4) such that deflection arising from generating very high extrusion pressures in the passageway is minimised and stresses are distributed to the bearings (4) in a manner avoiding concentrations or the incidence of unacceptably high variations in local stress levels. The cylinder (2) is end connected to a drive shaft (24) outboard of the bearing (4) with a splined end portion (22) of the drive shaft locating in an end recess (20) in the cylinder (2). Alternatively a bolted connection may be used. A tie bolt (36) extends coaxially of the cylinder (2) and serves to apply a compressive axial loading to the cylinder to counter tension stresses arising during extrusion. The bearings (4) include rollers (48) directly in contact with the end bosses (16, 18) of the cylinder, the cylinder being free to expand axially relative to one set of rollers (48). Cooling and lubricating fluid is supplied to the bearings (4) and end bosses (16, 18). Coolant may also be directed through passages lined with copper sleeves extending axially of the cylinder (2). The bearing surfaces on the bosses (16, 18) and the central region (70) of the cylinder (2) are formed as regions of increased hardness relative to the remainder of the cylinder.</p> |
