Abstract: A tool for machining a groove of a rotation-symmetric component, preferably a piston of an internal combustion engine, is provided. The machining is carried out by a rotation of the tool around an axis of symmetry of the rotation-symmetric component to be machined. The tool includes at least one arm disposed in such a way that a circumference of the rotation-symmetric component can at least be partially enclosed. Also, a machining device for machining of the groove is provided on the at least one arm. At least one adjusting device is provided to adjust a contact force of the at least one machining device on the rotation-symmetric component, and to adapt the tool to different diameters of the rotation-symmetric component.

Abstract: A method of manufacturing a ram configured to be mounted for reciprocation in a guide tube section of a powered hammer. The ram includes an outer circumferential surface, a radially outwardly projecting sealing portion, and a helically shaped vent channel defined in the circumferential surface and running from a front end portion of the circumferential surface to a rear end portion of the circumferential surface and being interrupted by the sealing portion. The method includes forming the outer circumferential surface of the ram and the helically shaped vent channel in a single manufacturing operation. For example, the method includes rotating a blank on a machine tool, forming the outer circumferential surface of the ram by applying a first machine tool bit to the blank while the blank is rotating, and forming the helically shaped vent channel in the outer circumferential surface by applying a second machine tool bit to the blank while the blank is rotating, without removing the blank from the machine tool.

Abstract: A working device of a noncircular workpiece, such as a piston of an internal combustion engine, is improved. A workpiece 10 is held by a work spindle and rotated. A noncircular working device 100 has a noncircular working unit base 110 and is provided with a servo motor 104. A noncircular working unit 120 is positioned along a Y axis, and an arbitrary cutting tool 133 is selected from a cutting tool group 130. A servo motor 112 reciprocates the noncircular working unit 120 on an X2 axis in synchronization with the rotation of the work spindle and performs noncircular working of the workpiece 10.

Abstract: The invention relates to a cutting tool for rotating and drilling into solid blocks, comprising a drill shank (1) and a cutting head (2) on one end. The cutting head (2) has a straight, front-face cutting edge (4) extending approximately crosswise in relation to the drill axis (3). The cutting head (2) also comprises a section (8) protruding from the shank of the drill (1) at a height (h) ranging from at least 5% to a maximum of 40% of the diameter (d) of the drill and at a width (b) ranging from at least 5% to a maximum of 40% of the diameter (d) of the drill. The section (8) comprises a straight, lateral cutting edge (5) which merges into a straight, rear-sided cutting edge (7) extending in an approximately parallel manner in relation to the front-faced cutting edge (4).

Abstract: The aim of the invention is to produce a rounding off on a diesel piston comprising a combustion recess and valve recesses that lie at a slant in relation to the piston floor. The rounding off should not significantly increase particle emissions. To this end, the edge of the recess is rounded off in the area of the valve recesses in a special machining phase, the cutting edges of the cutting tool being guided in one or more planes that are parallel to the inclined valve recess surface.

Abstract: An apparatus and method of utilization thereof is provided for machining pistons of reciprocating piston internal combustion engines. The piston is held in a work station by its interior cavity and the oil rings, oval side surface and hinge pin bore are machined on the piston without any refixturing of the piston required.

Abstract: A single point turning tool has a tip including a cutting edge with a tip radius and a linear portion added on one side of and slightly behind the point to form a cutting edge with a linear portion and a protruding portion. The protruding extends beyond the plane of the linear portion which, in turn, extends normal to a longitudinal axis on which the tip radius is centered. During manufacture of a piston, the turning tool is positioned with the linear portion aligned generally with the plane of the finished outer surface. The piston is turned while the tool cuts a helical path or turn around the skirt surface by advancing the tool each turn a desired dimension or lead that is greater than the width of the protruding portion but not greater than the combined widths of the linear and protruding portions.

Abstract: A single point turning tool has a tip including a cutting edge with a tip radius and a linear portion added on one side of and slightly behind the point to form a cutting edge with a linear portion and a protruding portion. The protruding extends beyond the plane of the linear portion which, in turn, extends normal to a longitudinal axis on which the tip radius is centered. During manufacture of a piston, the turning tool is positioned with the linear portion aligned generally with the plane of the finished outer surface. The piston is turned while the tool cuts a helical path or turn around the skirt surface by advancing the tool each turn a desired dimension or lead that is greater than the width of the protruding portion but not greater than the combined widths of the linear and protruding portions.

Abstract: A method for manufacturing a mechanical seal used in fluid applications, wherein the mechanical seal is comprised of a sintered (cemented) tungsten carbide ring that is turned on a lathe at a negative top rake angle instead of formed by grinding. The cemented tungsten carbide ring is initially prepared by rounding corners of the top surface to form a radii. The resulting mechanical seal yields significantly less surface damage, can be formed using faster cutting speeds and feeds than when grinding, enables formation of a greater range of complex geometries for the mechanical seals, and requires fewer passes than grinding. The compact is also formed at a significantly reduced cost as compared to grinding.

Abstract: A method for machining radial through-slots into a wall of a piston-ring groove which separates the ring groove from the piston interior. A piston for an internal combustion engine is provided in which the wall has varying thickness and is thinnest in the pressure and counterpressure sides of the piston. A cutting tool is held in a fixed position. The piston is rotated about its longitudinal axis. The rotating piston is brought into engagement with the fixed cutting tool so that slots of a predetermined axially height are machined into the ring-groove wall over the entire circumference of the piston. Also, radial through-slots are created only in the pressure and counterpressure sides of the piston.

Abstract: A piston holding device in which a conical register is provided inside the skirt of a piston and is engaged by a conical locating surface on a tailstock. The tailstock may also include a ram which is adapted to push on the inside of a piston crown and force the piston against a headstock. The holding device is used during piston machining.

Abstract: The present invention relates to a module for use with a portable lathe to machine an area of a pipe wherein a cutting tool is supported such that the orientation of its axial path of travel varies as the tool rotates around the pipe. The module feeds a cutting tool along an axial feed path that extends substantially parallel to a line connecting spaced apart reference points located on opposite sides of the area of the pipe to be machined. The orientation of this reference line varies with respect to the longitudinal axis of the pipe as the module is driven around the axis of the pipe. The mechanism to feed the cutting tool along its axial and rotational cutting paths has first and second drive shafts extending substantially perpendicular to each other. The mechanism is simplified by having a first tool support member pivotally attached to the portable lathe so as to pivot about an axis coincident with the axis of rotation of the first drive shaft.

Abstract: A machine tool (10) intended for machining components on site comprises a frame (12) mounted on bearings (14, 16). Each bearing (14, 16) comprises an inner fixed bearing (14C, 14D, 16C, 16D) clamped to a work piece (22) and an outer rotatable bearing (14A, 14B, 16A, 16B). The frame (12) supports one or more spindles (74) having two cutting tools (82, 84) which are driven by air motors (76) through gear boxes (78). The frame (12) is driven by an air motor (60) through a reduction gear box (56) and annular gear (54). The bearings (14, 16) are both split to enable the machine to be assembled around a work piece (22) so that the tool can machine diameters (22A, 22B).

Abstract: A method and apparatus for finishing pistons (10) and the like from foundry-turned castings during one clamping operation to provide enhanced manufacturing productivity. Separate boring and turning modules (34, 24) of the apparatus are mounted on a primary base (18) and a grooving module (54) is mounted on a secondary base (72). The modules automatically groove the ring grooves (11), turn the complex shape of the skirt (15) and bore the wrist pin bore (13) through an ordered sequence of manufacturing steps. The piston stock is mounted for rotation on headstock and tailstock assemblies (82, 84). These assemblies are carried on the secondary base (72) which is slidably mounted on the primary base for movement into operative position with respect to the boring and turning modules according to the ordered sequence. The method and system improve piston quality while reducing manufacturing costs including saving factory floor space.