US 5,152,163 A · Continuous extrusion apparatus

Abstract

Apparatus for the continuous extrusion of metals in which feed is introduced into two (or more) speed apart circumferential grooves in a rotating wheel (or rotating wheels) to contact an arcuate shoe portion and abutments extending into the grooves. The feed is constrained by the abutments to flow through frusto-conical exit apertures of cone angles in the range of 5.degree.-45.degree. in the shoe portion to a chamber which may also be of the divergent frusto-conical form, and is extruded as relatively thin-walled, large-cross-section products. Mixer plates are profiled to distribute flow evenly from the apertures to around the die opening. An extrusion die body for cylindrical extrusions is located and axially centered by set screws. Where an even number of grooves are utilized, an extrusion mandrel may be secured to the shoe portion by a bolt positioned centrally of the grooves and having a passage for injection of lubricant or oxidation inhibiting fluids. Since the volume feed rate is enhanced and the distance travelled by the material from the grooves is reduced, friction losses and the likelihood of discontinuities arising in extrudate products of relatively large hollow cross-section are thereby reduced.

Claims7

Dependent claims

Continuous extrusion apparatus, comprising:

a) a rotatable wheel formed with a plurality of identical spaced apart circumferential grooves;
b) arcuate tooling having a shoe portion bounding radially outer portions of the respective grooves provided with exit apertures extending in a generally radial direction from the respective grooves to a die chamber and abutments displaced in the direction of rotation from the exit apertures extending into the grooves, the die chamber extending around an extrusion mandrel and discharging axially of the extrusion mandrel through a die orifice intermediate the extrusion mandrel and an extrusion die body wall;
c) the exit apertures are formed with frusto-conical walls smoothly diverging radially outwardly from a face of the shoe portion bounding the grooves to merge smoothly with the die chamber adjacent to the die orifice such that the cross-sectional area of each exit aperture increases progressively from the grooves toward the die orifice;
and
d) a mixer plate positioned in the die chamber and profiled with arised protrusions respectively in register with aligned exit apertures and with intervening scalloped portions directed toward the extrusion mandrel and die orifice.

2 more elements

Dependencies are inferred from the claim text.

Continuous extrusion apparatus

Life of this patent

Continuous extrusion apparatus

Life of this patent

Abstract

Claims7