公开(公告)号：RO110307B1

公开(公告)日：1995-12-29

申请号：RO13780187

申请日：1987-07-17

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/20 ,  B21C23/21 ,  B21C26/00

Abstract: An indirect extrusion press and method of operating the press. The press includes a container with opposite axial ends and an axial cavity for receiving a billet. The container is mounted for aligning the axial cavity with the extrusion axis. A bolster is disposed adjacent one axial end of the container for blocking movement of a billet out of the cavity when a force is applied against the billet from the other axial end of the container. A ram is mounted on the side of the container adjacent the other axial end of the container for movement in the axial direction of the container. The ram has an axial passage therethrough aligned with the extrusion axis. A rotatable turret is mounted on the ram, and a hollow pressing stem is mounted on the turret. The turret is rotatable for placing the hollow pressing stem in a first position aligned with the extrusion axis, and in a second position off of the extrusion axis. When the hollow pressing stem is in the first position it communicates with the axial passage through the ram and can be moved axially, via the ram, to press a die through the cavity to extrude a billet to form an extrusion product which exits the container via the hollow pressing stem and the axial passage in the ram. When the hollow pressing stem is in the second position it permits other tooling to perform operations on the extrusion axis of the press.

公开(公告)号：AT131090T

公开(公告)日：1995-12-15

申请号：AT91901019

申请日：1990-09-20

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: H04B7/26 ,  B21C23/08 ,  B21J5/10 ,  B21J9/04 ,  H03K5/156 ,  H04B20060101 ,  H04B3/60 ,  H04B7/00 ,  H04L5/14 ,  H04L12/40

Abstract: An apparatus for pre-piercing billets includes a generally cylindrical container for receiving and supporting a generally cylindrical billet, a mandrel bar mounted for axial movement along the axis of the cylinder for penetrating the billet, and a bolster for engaging the billet during penetration of the billet by the mandrel bar, wherein the bolster includes a bolster pin which is axially movable along the axis of the container, the bolster pin having an end which contacts the billet during penetration of the billet by the mandrel bar such that the billet deforms about the end of the bolster pin. A movable support is carried by the mandrel bar toward the billet during advancement of the mandrel bar prior to pre-piercing the billet, the movable support being configured to enter the generally cylindrical container to engage a portion of the container so as to provide additional structural rigidity to the mandrel bar to resist deflection of the mandrel bar during penetration of the billet.

公开(公告)号：DE3750932T2

公开(公告)日：1995-06-14

申请号：DE3750932

申请日：1987-03-04

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/00 ,  B21C20060101 ,  B21C23/20 ,  B21C23/21 ,  B21C25/00 ,  B21C33/00 ,  B21C35/04 ,  B21C35/06

Abstract: An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the container so that the billet is sandwiched between the die and pressure disc, with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container. A bolster is located adjacent the pressure disc and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster exerts a relatively insigificant axial force against the container. An elongated stem having an axial passage is moved into the throughbore of the container to press the die toward the bolster, causing the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.

公开(公告)号：CA1307236C

公开(公告)日：1992-09-08

申请号：CA542378

申请日：1987-07-17

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/20 ,  B21C23/21 ,  B21C26/00

Abstract: An indirect extrusion press and method of operating the press. The press includes a container with opposited axial ends and an axial cavity for receiving a billet. The container is mounted for aligning the axial cavity with the extrusion axis. A bolster is disposed adjacent one axial end of the container for blocking movement of a billet out of the cavity when a force is applied against the billet from the other axial end of the container. A ram is mounted on the side of the container adjacent the other axial end of the container for movement in the axial direction of the container. The ram has an axial passage therethrough aligned with the extrusion axis. A rotatable turret is mounted on the ram, and a hollow pressing stem is mounted on the turret. The turret is rotatable for placing the hollow pressing stem in a first position aligned with the extrusion axis, and in a second position off of the extrusion axis. When the hollow pressing stem is in the first position it communicates with the axial passage through the ram and can be moved axially, via the ram, to press a die through the cavity to extrude a billet to form an extrusion product which exits the container via the hollow pressing stem and the axial passage in the ram. When the hollow pressing stem is in the second position it permits other tooling to perform operations on the extrusion axis of the press.

公开(公告)号：FI921184A

公开(公告)日：1992-03-19

申请号：FI921184

申请日：1992-03-19

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: H04B7/26 ,  B21C23/08 ,  B21J5/10 ,  B21J9/04 ,  H03K5/156 ,  H04B20060101 ,  H04B3/60 ,  H04B7/00 ,  H04L5/14 ,  H04L12/40 ,  B21J

Abstract: An apparatus for pre-piercing billets includes a generally cylindrical container for receiving and supporting a generally cylindrical billet, a mandrel bar mounted for axial movement along the axis of the cylinder for penetrating the billet, and a bolster for engaging the billet during penetration of the billet by the mandrel bar, wherein the bolster includes a bolster pin which is axially movable along the axis of the container, the bolster pin having an end which contacts the billet during penetration of the billet by the mandrel bar such that the billet deforms about the end of the bolster pin. A movable support is carried by the mandrel bar toward the billet during advancement of the mandrel bar prior to pre-piercing the billet, the movable support being configured to enter the generally cylindrical container to engage a portion of the container so as to provide additional structural rigidity to the mandrel bar to resist deflection of the mandrel bar during penetration of the billet.

公开(公告)号：CA2027003A1

公开(公告)日：1991-07-05

申请号：CA2027003

申请日：1990-10-05

Applicant: CHAPMAN GEORGE R ,  PRIESTER DONNAN E ,  STEWART CHARLES W

Inventor： CHAPMAN GEORGE R JR ,  PRIESTER DONNAN E ,  STEWART CHARLES W

IPC: B29C47/00 ,  C08J3/28 ,  C08L57/00 ,  C08L67/00 ,  C08L77/00

Abstract: TITLE Processing Aid For Polymers Polymer blend composition having improved processibility and comprising: (a) a major portion of a difficultly melt-processible polymer, and (b) a minor portion of: (1) at least an effective amount, to improve processibility, of a fluorocarbon copolymer which at the melt-processing temperature of (a) is either in a melted form if crystalline, or is above its glass transition temperature if amorphous, and (2) at least an effective amount, to improve processibility, of at least one tetrafluoroethylene homopolymer or copolymer of tetrafluoroethylene and at least one monomer copolymerizable therewith, wherein the mole ratio of fluorine to hydrogen is at least 1:1, and which is solid at the melt-processing temperature of (a); masterbatches comprised of the processing aid: and processes utilizing the processing aid.

公开(公告)号：AT62874T

公开(公告)日：1991-05-15

申请号：AT82902770

申请日：1982-07-29

Applicant: STEWART CHARLES F ,  STEWART JACK K

Inventor： STEWART CHARLES F ,  STEWART JACK K

IPC: B60K1/00

公开(公告)号：HUT52720A

公开(公告)日：1990-08-28

申请号：HU186487

申请日：1987-03-04

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/00 ,  B21C20060101 ,  B21C23/20 ,  B21C23/21 ,  B21C25/00 ,  B21C33/00 ,  B21C35/04 ,  B21C35/06

Abstract: An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the container so that the billet is sandwiched between the die and pressure disc, with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container. A bolster is located adjacent the pressure disc and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster exerts a relatively insigificant axial force against the container. An elongated stem having an axial passage is moved into the throughbore of the container to press the die toward the bolster, causing the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.

公开(公告)号：BR8707746A

公开(公告)日：1989-08-15

申请号：BR8707746

申请日：1987-07-17

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/20 ,  B21C23/21 ,  B21C26/00

Abstract: An indirect extrusion press and method of operating the press. The press includes a container with opposite axial ends and an axial cavity for receiving a billet. The container is mounted for aligning the axial cavity with the extrusion axis. A bolster is disposed adjacent one axial end of the container for blocking movement of a billet out of the cavity when a force is applied against the billet from the other axial end of the container. A ram is mounted on the side of the container adjacent the other axial end of the container for movement in the axial direction of the container. The ram has an axial passage therethrough aligned with the extrusion axis. A rotatable turret is mounted on the ram, and a hollow pressing stem is mounted on the turret. The turret is rotatable for placing the hollow pressing stem in a first position aligned with the extrusion axis, and in a second position off of the extrusion axis. When the hollow pressing stem is in the first position it communicates with the axial passage through the ram and can be moved axially, via the ram, to press a die through the cavity to extrude a billet to form an extrusion product which exits the container via the hollow pressing stem and the axial passage in the ram. When the hollow pressing stem is in the second position it permits other tooling to perform operations on the extrusion axis of the press.

公开(公告)号：FI883973A0

公开(公告)日：1988-08-26

申请号：FI883973

申请日：1988-08-26

Applicant: STEWART CHARLES L

Inventor： STEWART CHARLES L

IPC: B21C23/00 ,  B21C20060101 ,  B21C23/20 ,  B21C23/21 ,  B21C25/00 ,  B21C33/00 ,  B21C35/04 ,  B21C35/06 ,  B21C

Abstract: An indirect extrusion process, and apparatus therefor, for producing an extrusion product from a hot metal billet. A press container is mounted to be substantially axially stationary during extrusion of a billet. A hot billet, a die and a pressure disc are located into the axial throughbore of the container so that the billet is sandwiched between the die and pressure disc, with the pressure disc having a maximum outer diameter between opposite radial faces which is slightly less than the diameter of the axial throughbore to define a diametrical clearance between the pressure disc and the press container. A bolster is located adjacent the pressure disc and is axially fixed to substantially prevent axial movement of the pressure disc in a direction toward the bolster during extrusion. The bolster exerts a relatively insigificant axial force against the container. An elongated stem having an axial passage is moved into the throughbore of the container to press the die toward the bolster, causing the billet to be extruded through the die to create an extrusion product which exits the container through the axial passage in the stem, while extrusion of the billet through the diametrical clearance between the pressure disc and the container is substantially avoided.