Abstract: A method and apparatus for producing gun barrels having a grooved or ribbed inner surface with straight or helical grooves or ribs, by providing a metallic hollow cylindrical pre-form, placing the pre-form on a core mandrel being part of a flow forming machine having a main machine axis, the core mandrel having a structured outer surface comprising ribs and/or grooves extending straightly parallel to and/or helically around the main axis; and applying forming rollers, in a roller arrangement, to the outside surface of the pre-form so as to apply radial pressure on the pre-form such that its material begins to flow. As the rollers apply force upon the pre-form, a relative motion between the pre-form and the rollers is performed by moving the pre-form in axially parallel to the main axis through the roller arrangement or by moving the roller arrangement alongside the pre-form.

Abstract: A device for flow-forming workpieces having a rotatable first, outer forming tool for acting upon an outer contour of a first workpiece in the form of a hollow body. The device also has a first, inner forming tool for acting upon an inner contour of the workpiece. The first workpiece can be set in rotation about a first workpiece axis and can be plastically deformed by a pressure applied by the first, inner forming tool and the first, outer forming tool in a forming zone formed between the first forming tools by the material being made to flow between the first forming tools. The device has a drive for driving the first, outer forming tool.

Abstract: A method and apparatus for producing gun barrels having a grooved or ribbed inner surface with straight or helical grooves or ribs, by providing a metallic hollow cylindrical pre-form, placing the pre-form on a core mandrel being part of a flow forming machine having a main machine axis, the core mandrel having a structured outer surface comprising ribs and/or grooves extending straightly parallel to and/or helically around the main axis; and applying forming rollers, in a roller arrangement, to the outside surface of the pre-form so as to apply radial pressure on the pre-form such that its material begins to flow. As the rollers apply force upon the pre-form, a relative motion between the pre-form and the rollers is performed by moving the pre-form in axially parallel to the main axis through the roller arrangement or by moving the roller arrangement alongside the pre-form.

Abstract: A device to process a blank (3) that includes at least one outer shaping tool (8) that may be radially positioned or radially displaced. An inner shaping tool (9) is mounted co-axially to the main machine axis (x) of the main spindle (1.1). The inner shaping tool (9) may be axially displaced and/or axially positioned with respect to the axial position of the outer shaping tools (8).

Abstract: A device for flow-forming workpieces having a rotatable first, outer forming tool for acting upon an outer contour of a first workpiece in the form of a hollow body. The device also has a first, inner forming tool for acting upon an inner contour of the workpiece. The first workpiece can be set in rotation about a first workpiece axis and can be plastically deformed by a pressure applied by the first, inner forming tool and the first, outer forming tool in a forming zone formed between the first forming tools by the material being made to flow between the first forming tools. The device has a drive for driving the first, outer forming tool.

Abstract: A method for producing workpieces wherein a substantially rotationally symmetrical workpiece (4, 9, 33), which has a workpiece axis (22), is tentered concentrically relative to an inner mandrel (3, 16) provided inside the workpiece (4, 9, 33), and is reshaped by a process of flow forming by radially applying external reshaping rollers (7). The wall thickness of the workpiece (4) is also reduced in at least some regions. The inner diameter (18, 41) of the workpiece (33) is enlarged by applying inner reshaping rollers (11) of an inner reshaping unit. The inner reshaping rollers (11) are arranged such that the roller axes of rotation and the enveloping cone (20) all intersect at one point on the workpiece axis (22).

Abstract: A device for manufacturing or processing work pieces consists of a preform (4.1), with a mandrel (1a) that is supported rotatably and parallel to a longitudinal axis (x) of the device, an associated chuck (1b) for clamping the preform (4.1) as well as a spindle sleeve (2a) that can be coupled with the mandrel (1a) and can be moved along the longitudinal direction (x), and with a forming unit (3) for forming the preform (4.1). The chuck (1b) is designed in a rotational fashion in relation to the mandrel (1a).

Abstract: A device to process a blank (3) that includes at least one outer shaping tool (8) that may be radially positioned or radially displaced. An inner shaping tool (9) is mounted co-axially to the main machine axis (x) of the main spindle (1.1). The inner shaping tool (9) may be axially displaced and/or axially positioned with respect to the axial position of the outer shaping tools (8).

Abstract: A method for producing workpieces wherein a generally cylindrical preform (8) is formed by at least one pressure roller (7) into a finished workpiece (8.2). The method includes slidingly placing a portion of the preform (8) on at least a first mandrel (3, 4?) which is slidably mounted in parallel with the longitudinal axis (A) of the preform (8), aligning the mandrel (3, 4?) such that the surface (3b, 4b, 4b?) thereof disposed within the preform (8) substantially defines a negative profile of an inner surface to be formed in said preform (8), and performing a relative movement between the preform (8) and the pressure roller (7) in a direction parallel to the longitudinal axis (A) while pressing the pressure roller (7) against the preform (8) such that material of the preform (8) is displaced by the pressure roller (7) in such a way that the mandrel (3, 4?) is moved by the displaced material.

Abstract: A device for manufacturing or processing work pieces consists of a preform (4.1), with a mandrel (1a) that is supported rotatably and parallel to a longitudinal axis (x) of the device, an associated chuck (1b) for clamping the preform (4.1) as well as a spindle sleeve (2a) that can be coupled with the mandrel (1a) and can be moved along the longitudinal direction (x), and with a forming unit (3) for forming the preform (4.1). The chuck (1b) is designed in a rotational fashion in relation to the mandrel (1a).