Method for forming a collar in a muffler shell including: providing a muffler shell made of a metal sheet and forming a muffler housing, the muffler shell having an exhaust gas opening, providing a collar forming head having a rotational axis and at least two movable expanders, introducing a collar forming head into a muffler housing, moving the expanders of the collar forming head introduced into the muffler shell radially away from the rotational axis of the collar forming head from a retracted position to an expanded position rotating the collar forming head around the of the collar forming head, bringing the rotating expanded collar forming head in contact with the metal sheet forming an outwardly projecting collar around the exhaust gas opening by flaring the edge of the metal sheet.

Method for forming a collar in a muffler shell including: providing a muffler shell made of a metal sheet and forming a muffler housing, the muffler shell having an exhaust gas opening, providing a collar forming head having a rotational axis and at least two movable expanders, introducing a collar forming head into a muffler housing, moving the expanders of the collar forming head introduced into the muffler shell radially away from the rotational axis of the collar forming head from a retracted position to an expanded position rotating the collar forming head around the of the collar forming head, bringing the rotating expanded collar forming head in contact with the metal sheet forming an outwardly projecting collar around the exhaust gas opening by flaring the edge of the metal sheet.

A method for producing a hollow shaft from a tubular preform by pressure rolling shapes each end of the preform using at least one forming roller. A tubular preform with a round or polygonal cross-section is used, and the preform is held on a workpiece holder in the central tube region during the entire production process until the hollow shaft is completed.

A shock absorber pressure tube defining a working chamber is provided. A piston assembly coupled to a piston rod is slidably disposed in the pressure tube and divides the working chamber into upper and lower working chambers. A reserve tube surrounds the pressure tube to define a reserve chamber. A base valve assembly, position at one end of the pressure tube, controls fluid flow between the lower working chamber and the reserve chamber. The reserve tube comprises first and second open shells that are joined together at longitudinal seams to create a substantially cylindrical shape. The first and second open shells may be made from patchwork blanks, tailor welded blanks, tailor rolled blanks, or tailor heat treated blanks to give different portions of the first and second open shells different thicknesses, strengths, properties, or characteristics.

Apparatus and associated methods relate to a unitary ring gear-flange body (URGFB). In an illustrative example, the flange body may be spin-formed and may, for example, include a riser body extending substantially parallel to a longitudinal axis and a flange extending substantially radially outward from the riser body. To the riser body may, for example, be welded a ring gear to form a unitary assembly, the ring gear having an axis of revolution aligned with the longitudinal axis. A continuous coating may, for example, be applied to at least a selected portion of a surface of the unitary assembly. Various embodiments may advantageously provide a cost-efficient, weight-efficient, and/or time-efficient unitary body which may, for example, be coupled to machinery to provide a shaftless torque-transmitter.

Apparatus and associated methods relate to a unitary ring gear-flange body (URGFB). In an illustrative example, the flange body may be spin-formed and may, for example, include a riser body extending substantially parallel to a longitudinal axis and a flange extending substantially radially outward from the riser body. To the riser body may, for example, be welded a ring gear to form a unitary assembly, the ring gear having an axis of revolution aligned with the longitudinal axis. A continuous coating may, for example, be applied to at least a selected portion of a surface of the unitary assembly. Various embodiments may advantageously provide a cost-efficient, weight-efficient, and/or time-efficient unitary body which may, for example, be coupled to machinery to provide a shaftless torque-transmitter.

The invention relates to a device and a method for forming, in which at least one spindle is driven in a rotating manner by means of a rotary drive, a workpiece is received on the spindle by means of a clamping means and clamped on the spindle and at least one forming roller is fed axially and/or radially relative to the workpiece in order to carry out a spinning or flow-forming process. In accordance with the invention provision is made for the spindle and the clamping means to be combined to a changing unit which is adjustable transversely to the axis of rotation, wherein the changing unit is adjusted between a forming position and a set-up position.

The invention relates to a device and a method for forming, in which at least one spindle is driven in a rotating manner by means of a rotary drive, a workpiece is received on the spindle by means of a clamping means and clamped on the spindle and at least one forming roller is fed axially and/or radially relative to the workpiece in order to carry out a spinning or flow-forming process. In accordance with the invention provision is made for the spindle and the clamping means to be combined to a changing unit which is adjustable transversely to the axis of rotation, wherein the changing unit is adjusted between a forming position and a set-up position.

The present invention discloses a method for coreless spinning of a large-ratio multi-variable-diameter hollow shaft, belonging to the field of spinning. The present invention includes following steps: S1: clamping a blank in a lower die unit, driving the workpiece to rotate, causing a rough spinning wheel and a fine spinning wheel to be in contact with the workpiece for staggered spinning, and performing curved reciprocating feed spinning via point contact to form a roughly-spun blank; S2: shifting the rough spinning wheel and the fine spinning wheel, causing shaping spinning wheels to be in contact with the workpiece for shaping spinning, and subjecting the shaping spinning wheels to linear contact shaping and fine spinning only in a radial direction, to obtain a finely spun blank. The present invention solves the problems of high machining difficulty and poor molding quality of hollow shafts in the prior art.

An inner roller feeding device for a baseplate of a counter-roller driving power spinning equipment includes an inner roller column, an inner roller top plate, an inner roller upper plate, an inner roller lower plate, a cam, a cam mounting cylinder, inner rollers, inner roller shafts, a feed screw, a servo motor and a baseplate. According to the inner roller feeding device, a brake motor serves as a power source, the inner roller is driven by the cam through a worm gear drive to feed along a radial direction of a workpiece, such that an inner roller mechanism is small in size, large in adjustment range and high in positioning precision.