Eccentric pipe sections

An extrusion process for manufacturing an eccentric pipe section out of an extrusion block employing an extrusion press device having a container with a chamber with a longitudinal axis MR which accommodates the extrusion block, an extrusion stem which is introduced into the container chamber and features a dummy block, a mandrel body forming an inner wall of the pipe-section, and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body is a mandrel arm of longitudinal axis MD with a tip, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening, so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 respectively passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to a line p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR, the process comprising the steps of:

• pushing the extrusion block to the die end face by means of the extrusion stem;
• driving the mandrel arm from the dummy block into the extrusion block;
• and pushing the mandrel tip in a position eccentric with respect to the die opening up to or into the die opening, the mandrel arm being pushed through the extrusion block in an eccentric position, and the extrusion block being pushed through the die by the extrusion stem so that extrusion block material flows without forming a seam over the whole cross-section at uniform speed around the mandrel tip into the die, opening.

A process for producing a bent hollow section out of an extrusion block employing an extrusion press device according having a container with a chamber with a longitudinal axis MR which accommodates the extrusion block, an extrusion stem which is introduced into the container chamber and features a dummy block, a mandrel body forming an inner wall of the pipe-section, and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body is a mandrel arm of longitudinal axis MD with a tip, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 respectively passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to a line p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR, the process comprising the steps of:

• pushing the extrusion block to the die end face by means of the extrusion stem;
• driving the mandrel arm from the dummy block into the extrusion block;
• and pushing the mandrel tip in a position eccentric with respect to the die opening up to or into the die opening, the mandrel arm being pushed through the extrusion block in an eccentric position, and the extrusion block being pushed through the die by the extrusion stem so that extrusion block material flows without forming a seam over the whole cross-section at uniform speed around the mandrel tip into the die opening.

A process for producing a rear axle support out of an extrusion block employing an extrusion press device having a container with a chamber with a longitudinal axis MR which accommodates the extrusion block, an extrusion stem which is introduced into the container chamber and features a dummy block, a mandrel body forming an inner wall of the pipe-section, and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body is a mandrel arm of longitudinal axis MD with a tip, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening, so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 respectively passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to a line p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR, the process comprising the steps of:

• pushing the extrusion block to the die end face by means of the extrusion stem;
• driving the mandrel arm from the dummy block into the extrusion block;
• and pushing the mandrel tip in a position eccentric with respect to the die opening up to or into the die opening, the mandrel arm being pushed through the extrusion block in an eccentric position, and the extrusion block being pushed through the die by the extrusion stem so that extrusion block material flows without forming a seam over the whole cross-section at uniform speed around the mandrel tip into the die opening.

A process for producing a structured hollow section out of an extrusion block employing an extrusion press device having a container with a chamber with a longitudinal axis MR which accommodates the extrusion block, an extrusion stem which is introduced into the container chamber and features a dummy block, a mandrel body forming an inner wall of the pipe-section, and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body is a mandrel arm of longitudinal axis MD with a tip, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening, so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 respectively passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to a line p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR, the process comprising the steps of:

• pushing the extrusion block to the die end face by means of the extrusion stem;
• driving the mandrel arm from the dummy block into the extrusion block;
• pushing the mandrel tip in a position eccentric with respect to the die opening up to or into the die opening, the mandrel arm being pushed through the extrusion block in an eccentric position, and the extrusion block being pushed through the die by the extrusion stem so that extrusion block material flows without forming a seam over the whole cross-section at uniform speed around the mandrel tip into the die opening;
• and shaping the hollow section using high internal pressure.

A process for producing a support section to accommodate directional bending forces out of an extrusion block employing an extrusion press device having a container with a chamber with a longitudinal axis MR which accommodates the extrusion block, an extrusion stem which is introduced into the container chamber and features a dummy block, a mandrel body forming an inner wall of the pipe-section, and a die with an opening with a longitudinal axis MK forming an outer wall of the pipe section, the mandrel body is a mandrel arm of longitudinal axis MD with a tip, the mandrel arm being arranged eccentric in cross-section with respect to the container chamber and with respect to the die opening, the die opening being eccentric in cross-section with respect to the container chamber, and the longitudinal axis MD of the mandrel arm and the longitudinal axis MR of the container being a distance apart and substantially parallel to the longitudinal axis MK of the die opening, so that the longitudinal axis MK of the die opening in cross-section lies between a pair of straight lines g1 and g2 each passing through the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR as well as perpendicular to lines p connecting the mandrel arm longitudinal axis MD and the container chamber longitudinal axis MR, the process comprising the steps of:

• pushing the extrusion block to the die end face by means of the extrusion stem;
• driving the mandrel arm from the dummy block into the extrusion block;
• and pushing the mandrel tip in a position eccentric with respect to the die opening up to or into the die opening, the mandrel arm being pushed through the extrusion block in an eccentric position, and the extrusion block being pushed through the die by the extrusion stem so that extrusion block material flows without forming a seam over the whole cross-section at uniform speed around the mandrel tip into the die opening.