Extrusion

Claim 2

A process of continuously extruding metal which comprises the steps of feeding metal into one end of a passageway formed between a first member and a second member with the second member having a greater surface area for engaging the metal than the first member, said passageway having a closed end remote from said one end and having die means at said closed end, and moving the second member relative to the first member in a direction towards the die means from said one end to said closed end such that the frictional drag of the passageway defining surfaces of the second member draw the metal through the passageway and through the die means.

Claim 3

A process according to claim 1 wherein said passageway is formed between a wheel member having an endless groove therein and a shoe member covering a part of the length of the groove, and wherein the wheel member is rotated in a direction to drag metal through the passageway and the die means.

Claim 4

Extrusion apparatus comprising first and second members defining an elongate passageway therebetween, said first and second members being movable one relative to the other in the direction of the length of the passageway, an abutment member fixed relative to said second member projecting into and blocking the passageway, means defining at least one die orifice leading from the passageway adjacent the abutment member, said orifice extending from said passageway to a point outside said apparatus whereby material fed to said apparatus is extruded therethrough, means for continuously feeding material to be extruded from a position outside said apparatus into said passageway at a point spaced from the abutment member, the amount of the surface area of the passageway defined by the first member which is movable towards the abutment member being greater than the amount of the surface area of the passageway dEfined by the second member, whereby material fed into the passageway is moved by frictional drag with the surfaces of the passageway in the first member towards the abutment member and is thereby extruded through the die orifice.

Claim 5

Extrusion apparatus comprising first and second members defining an elongate passageway therebetween, said first and second members being movable one relative to the other in the direction of the length of the passageway, an abutment member fixed relative to said second member projecting into and blocking the passageway, means defining at least one die orifice leading from the passageway adjacent the abutment member, said orifice extending from said passageway to a point outside said apparatus whereby material fed to said apparatus is extruded therethrough, means for continuously feeding material to be extruded from a position outside said apparatus into said passageway at a point spaced from the abutment member, the amount of the surface area of the passageway defined by the first member which is movable towards the abutment member being greater than the amount of the surface area of the passageway dEfined by the second member, whereby material fed into the passageway is moved by frictional drag with the surfaces of the passageway in the first member towards the abutment member and is thereby extruded through the die orifice.

Claim 6

Extrusion apparatus comprising a wheel member having an endless groove therein, a shoe member covering part only of the length of the groove and forming a passageway therewith, an abutment member projecting from the shoe member into the groove and blocking one end of the passageway, the wheel member being rotatable relative to the shoe member in the direction towards the abutment member, at least one die orifice adjacent the abutment member, and means for feeding material to be extruded into the end of the passageway remote from the abutment member so that the material is carried along in the groove by frictional drag in the direction towards the abutment member and is thereby extruded through the die orifice.

Claim 7

Extrusion apparatus comprising a wheel member having an endless groove therein, a shoe member covering part only of the length of the groove and forming a passageway therewith, an abutment member projecting from the shoe member into the groove and blocking one end of the passageway, the wheel member being rotatable relative to the shoe member in the direction towards the abutment member, at least one die orifice adjacent the abutment member, and means for feeding material to be extruded into the end of the passageway remote from the abutment member so that the material is carried along in the groove by frictional drag in the direction towards the abutment member and is thereby extruded through the die orifice.

Claim 8

Extrusion apparatus according to claim 4 wherein the groove is of uniform cross sectional shape throughout its length and is defined by a surface of revolution about the axis of the wheel member.

Claim 9

Extrusion apparatus according to claim 4 wherein the groove is formed circumferentially in the outer edge of the wheel member.

Claim 10

Extrusion apparatus according to claim 3, in which the passageway has a uniform cross sectional shape throughout its length.

Claim 11

Extrusion apparatus as claimed in claim 3, wherein said die orifice is provided in the leading face of the abutment member.

Claim 12

Extrusion apparatus as claimed in claim 3, wherein a multiplicity of die orifices are provided in the leading face of the abutment member.

Claim 13

Extrusion apparatus as claimed in claim 4 wherein said abutment member is of solid form, said die orifice being provided in the face of the shoe member in front of the abutment member.

Claim 14

Extrusion apparatus as claimed in claim 4 wherein a multiplicity of die orifices are provided in the face of the shoe member forward of the solid abutment member.

Claim 15

Extrusion apparatus as claimed in claim 4 wherein the device includes a plurality of shoe members co-operating with the groove at spaced intervals, each of said shoe members forming a said passageway.

Claim 16

Extrusion apparatus as claimed in claims 4 wherein a tool member having a material working face is provided for operation on material in the groove of the wheel member in the region adjacent the abutment member, means being provided for moving said tool member in a closed cyclic path so that the material in the groove adjacent the abutment member is subjected to additional compressive stress by the working face of the tool member whereby the material is extruded through the die orifice under the influence of the additional compressive stress in combination with the bulk compressive stress set up in the material within the groove by rotation of the wheel member.

Claim 17

Extrusion apparatus as claimed in claim 4 wherein a rotary tool member having an end face with a tooth member projecting therefrom and a die orifice associated with the tooth member is fitted in a housing in the shoe member with the end face of the tool member open to the region of the groove adjacent the face of the abutment member, means being provided for rotating the tool member about its axis transverse to the end face having the projecting tooth member so that the tooth member is moved in a circular path with its forward working face in pressure contact with the material in the region of the groove adjacent the face of the abutment member whereby the material forward of the working face of the tooth member is subjected to an additional compressive stress so that the material is extruded through the die orifice under the influence of the additional compressive stress in combination with the bulk compressive stress set up in the material within the groove by rotation of the wheel member.

Claim 18

Extrusion apparatus as claimed in claim 14 wherein a guide member is provided for dIstributing to the end face of the rotary tool member, the material in the region of the groove adjacent the face of the abutment member, said guide member having a wedge shaped base which is located at the bottom of the groove and tapering away from the face of the abutment member, the base of the guide member having an upstanding boss the end face of which bears centrally on the end face of the tool member so that the tooth member which projects from the end face thereof rotates around the end of the boss of the guide member as the tool member is rotated.