Claims
- 1. A method for hydrostatic extrusion of a billet including the steps of:
- extruding a portion of the billet through a first die ths forming a primary extrusion section of the billet;
- stopping said primary extrusion followed by extruding the primary extrusion section through a secondary die, thus forming a secondary extrusion defining said desired size and shape of the finished extrusion;
- stopping said secondary extrusion which simultaneously initiating extrusion of the billet to form a second primary extrustion section; and
- alternately extruding said billet and said primary extrusion sections until said billet is extruded to the desired corss-section dize, shape, and length.
- 2. A method according to claim 1 wherein said secondary extrusion is subjected to an extrusion, thus forming a tertiary extrusion, before said billet is subjected to further extrusion steps.
- 3. A method according to claim 1 wherein a plurality of incremental, ever decreasing in size extrusions are formed in a step-wise manner alternately until said billet is extruded to the desired size and shape.
- 4. A method according to claim 1 wherein a hollow billet is extruded over a solid mandrel.
- 5. A method according to claim 1 wherein said primary extrusion is an elongated filament which is accumulated in a pressure chamber which is pressurized after completion of the primary extrusion to force the primary extrusion through the secondary die.
- 6. A method of extruding a billet including the steps of:
- hydrostatically extruding a portion of the billet through a first die thus forming a primary extrusion section of the billet;
- stopping said primary extrusion followed by extruding the primary extrusion section through a secondary die by conventional extrusion means, thus forming a secondary extrusion defining the desired size and shape of the finished extrusion;
- stopping said secondary extrusion while simultaneously initiating extrusion of the billet to form a secondary primary extrusion section; and
- alternately extruding said billet and said primary extrusion sections until said billet is extruded to the desired cross-section size, shape, and length.
- 7. A method according to claim 6 wherein said billet is further extruded by extruding said secondary extrusion by conventional means to form a tertiary extrusion to a desired smaller cross-section size, shape, and length.
- 8. A method according to claim 6 wherein said billet is further extruded by conventional means to form a tertiary extrusion section and said tertiary extrusion section is extruded by hydrostatic means to form a quarternary extrusion section.
- 9. A method of extruding a billet including the steps of:
- extruding a portion of the billet through a first die by conventional means thus forming a primary extrusion section of the billet;
- stopping said primary extrusion followed by hydrostatically extruding the primary extrusion section through a secondary die, thus forming a secondary extrusion defining the desired size and shape of the finished extrusion;
- stopping said secondary extrusion while simultaneously initiating extrusion of the billet to form a secondary primary extrusion section; and
- alternately extruding said billet and said primary extrusion sections until said billet is extruded to the desired cross-section size, shape, and length.
- 10. A method of extruding a billet including the steps of:
- hydrostatically extruding a portion of the billet through a first die thus forming a primary extrusion section of the billet;
- stopping said primary extrusion followed by hydrostatically extruding the primary extrusion section through a secondary die thus forming a secondary extrusion defining the desired size and shape of the finished extrusion;
- stopping said secondary extrusion while simultaneously initiating extrusion of the billet to form a secondary primary extrusion section; and
- alternately extruding said billet and said primary extrusion sections until said billet is extruded to the desired cross-section size, shape, and length.
- 11. A method according to claim 10 wherein said secondary extrusion is hydrostatically extruded, thus forming a tertiary extrusion before said billet is subjected to further extrusion steps.
- 12. A method according to claim 10 wherein a plurality of incremental, ever decreasing in size extrusions are formed in a step-wise manner alternately until said billet is extruded to the desired size and shape.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of my U.S. Patent application Ser. No. 642,907 filed Dec. 22, 1975, now U.S. Patent 3,999,415.
US Referenced Citations (4)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
642907 |
Dec 1975 |
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