Provided is an integrated shape/property control method for hot power spinning of a cylindrical part based on a hot processing map. The method comprises: during the process of thermoplastic forming of a difficult-to-deform metal, performing a high-temperature mechanical property test on the metal material at a temperature and a strain rate range where dynamic recrystallization occurs; constructing, based on the power dissipation during the thermoplastic forming and a judging criterion for flow instability and on a flow stress-strain relation obtained from the high-temperature mechanical property test, power dissipation maps and flow instability maps at different strains, respectively; combining the power dissipation maps with the flow instability maps to obtain a hot processing map of the material; according to a profile of a power dissipation rate factor η and the flow instability criterion, obtaining potential dangerous forming conditions met with the flow instability criterion, and safe forming conditions under which the power dissipation rate factor η is large and the thermoplastic forming is facilitated; and finally performing hot power spinning of the cylindrical part at the temperature and strain rate that facilitates the thermoplastic forming of the material according to the hot processing map.

A method for producing a valve body of a hollow valve includes providing a workpiece blank or semi-finished product, spin extruding the workpiece to produce a preform having a cup with a hollow shape formed by the cup wall. A hollow valve produced by this method is also provided.

A system to manufacture an object includes a headstock, a tailstock, and a mandrel having a first end coupled to the headstock and a second end coupled to the tailstock. The system also includes an actuator coupled to one or more of the headstock, the tailstock, or the mandrel, the actuator operable to apply a force to the one or more of the headstock, the tailstock, or the mandrel, to oppose deformation of the mandrel.

A system to manufacture an object includes a headstock, a tailstock, and a mandrel having a first end coupled to the headstock and a second end coupled to the tailstock. The system also includes an actuator coupled to one or more of the headstock, the tailstock, or the mandrel, the actuator operable to apply a force to the one or more of the headstock, the tailstock, or the mandrel, to oppose deformation of the mandrel.

The present disclosure provides a process for manufacturing a light-alloy hybrid wheel comprising the following separate operation phases: obtaining a front flange with an internal profile including a tire bead seat; obtaining a rim with an annular profile including a tire bead seat at a first end and a circular flank for assembly with a part of the flange at a second end; and assembling the flange and the rim to form a wheel. The annular profiles of the flange and the rim form exterior and interior sides of the wheel. Assembling the flange and the rim comprises welding the flank of the rim and the flange together by a single friction stir weld using a pin such that the weld is exposed at the exterior and interior sides of the wheel.

The present disclosure provides a process for manufacturing a light-alloy hybrid wheel comprising the following separate operation phases: obtaining a front flange with an internal profile including a tire bead seat; obtaining a rim with an annular profile including a tire bead seat at a first end and a circular flank for assembly with a part of the flange at a second end; and assembling the flange and the rim to form a wheel. The annular profiles of the flange and the rim form exterior and interior sides of the wheel. Assembling the flange and the rim comprises welding the flank of the rim and the flange together by a single friction stir weld using a pin such that the weld is exposed at the exterior and interior sides of the wheel.

The invention relates to a method for producing a valve body for a hollow valve. Said method comprises the following steps: providing a workpiece, blank or semi-finished product and a forming punch, introducing a protective layer between the workpiece and the forming punch (22) and press forming the workpiece to produce a preform. The invention also relates to a hollow valve produced by means of this method.

The invention relates to a method for producing a valve body for a hollow valve. Said method comprises the following steps: providing a workpiece, blank or semi-finished product and a forming punch, introducing a protective layer between the workpiece and the forming punch (22) and press forming the workpiece to produce a preform. The invention also relates to a hollow valve produced by means of this method.

A method for producing a valve body of a hollow valve with optimised interior stem geometry includes a preform with a valve plate and a tubular wall surrounding a cavity. Flow forming the tubular wall over a flow-forming mandrel, which is inserted into the cavity to enlarge a length of the tubular wall. An interior area of the tubular wall is embossed with a structure either due to the fact that the flow-forming mandrel is a structuring mandrel having a surface structure, or alternatively, because the method includes a further step of reducing an outer diameter of the tubular wall by swaging or drawing and ironing over a structuring mandrel. Furthermore, a hollow valve is produced by this method.

A method for producing a valve body of a hollow valve with optimised interior stem geometry includes a preform with a valve plate and a tubular wall surrounding a cavity. Flow forming the tubular wall over a flow-forming mandrel, which is inserted into the cavity to enlarge a length of the tubular wall. An interior area of the tubular wall is embossed with a structure either due to the fact that the flow-forming mandrel is a structuring mandrel having a surface structure, or alternatively, because the method includes a further step of reducing an outer diameter of the tubular wall by swaging or drawing and ironing over a structuring mandrel. Furthermore, a hollow valve is produced by this method.