Abstract: A gear box, in particular a planetary gear box of a gas turbine engine, is proposed, having at least one planet carrier which comprises two webs which are spaced apart in an axial direction. By means of the webs, at least one planet gear which is configured to be rotatable relative to the planet carrier is operatively connected to the planet carrier. An axis of rotation of the planet gear, below or in the case of a defined load-dependent deformation of the planet carrier, deviates from a parallel course of an axis of symmetry of the planet carrier. Furthermore, the axis of rotation of the planet gear, in the case of a further defined load-dependent deformation of the planet carrier greater than the defined load-dependent deformation of the planet carrier, runs at least approximately parallel to the axis of symmetry of the planet carrier.

Abstract: A device for covering a tooth profile during machined processing with a tool, including an appliance for applying cooling lubricant to at least one contact area between the tool and the tooth profile during machine processing of the tooth profile by means of the tool. The appliance includes a guiding means by means of which a front face of the tooth profile in an area that is facing towards the contact area and an environment of the tooth profile in front of the area can be at least partially covered. The appliance is formed with at least one conduit which, in the operational state of the guiding means in which the tooth profile is covered, is arranged so as to extend in front of the tooth profile in the area that is shielded by the guiding means, and via which cooling lubricant can be supplied to the contact area through the guiding means.

Abstract: During the repair of welded two-stage or multi-stage compressor or turbine drums, which after welding are machined in the weld area down to a height A, a first material coating with a height B extending on both sides from the root face is applied to the machined weld area, and a second and lesser material coating is applied by laser welding to the area of plasma pockets formed on the intact rotor disk, with the sum of the heights A and B corresponding to an original height C in the weld area prior to its final machining. Then the defective rotor disk is detached in the root face and through the middle of the first material coating, and after that a new rotor disk already validated in the new construction with the root face validated in the new construction is welded on using appropriate welding parameters, and the weld area is machined, in line with the parameters already used for the new construction, down to the original height A.

Abstract: A method for the manufacture of a cutting tool provided with a tool holder (1) to which a cutter (2) is separably attached, includes applying a generative production process to a tool base body (3) to create the tool holder (1) with a desired finished shape.

Abstract: With the fabrication of integrally bladed rotors or stators (blisks) for gas-turbine engines, where the space confined by the pressure and suction side as well as the annulus surface is shaped by cutting and machining from the solid material, starting at the periphery of a ring or disk, a stiffness-optimized pre-machining contour is cut out in a cutting process at a certain distance from the pressure and suction side along straight control surfaces at a cutting angle varying in correspondence with the blade twist and along a conical surface extending at a certain distance from the annulus surface as well as along transition surfaces between the conical and the control surfaces, and subsequently finish machined by finish milling to produce the final contour of the blade, annulus and transition surfaces. The method reduces tool wear and is cost-effective.

Abstract: During the repair of welded two-stage or multi-stage compressor or turbine drums, which after welding are machined in the weld area down to a height A, a first material coating with a height B extending on both sides from the root face is applied to the machined weld area, and a second and lesser material coating is applied by laser welding to the area of plasma pockets formed on the intact rotor disk, with the sum of the heights A and B corresponding to an original height C in the weld area prior to its final machining. Then the defective rotor disk is detached in the root face and through the middle of the first material coating, and after that a new rotor disk already validated in the new construction with the root face validated in the new construction is welded on using appropriate welding parameters, and the weld area is machined, in line with the parameters already used for the new construction, down to the original height A.

Abstract: On a numerically controlled machine tool a sub-program is integrated into the given program for controlling the machine tool by which a periodic change of at least one cutting tool parameter is effected in one processing cycle, or also in several processing cycles, or in certain length and diameter zones of the workpiece characterized by tool vibrations and leading to inferior workpiece quality. By way of the periodic cutting parameter change, self-excited tool vibrations are avoided in these sensitive machining areas, thereby enabling tool wear to be reduced and workpiece quality improved. Furthermore, this intervention into the machining program is documentable and identically reproducible for each workpiece—independently of the expertise and personal judgement of the operator.

Abstract: With an integrally bladed rotor, material removal is performed from the annulus (5) on a wide, even machining path (8) using the front-side cutting area of an essentially cylindrical cutter head (7). The tool shank (9) is shaped and dimensioned such that it does not collide with the opposite lateral surfaces of the differently curved and twisted blades (4). This type of machining enables an essentially even, smooth annulus surface to be obtained with a reduced number of overlapping machining paths (8). The time required for machining the annulus and the tool wear are reduced. With an annulus machined in accordance with the present invention, the rotor will satisfy high requirements on aerodynamics.

Abstract: With the fabrication of integrally bladed rotors or stators (blisks) for gas-turbine engines, where the space confined by the pressure and suction side as well as the annulus surface is shaped by cutting and machining from the solid material, starting at the periphery of a ring or disk, a stiffness-optimized pre-machining contour is cut out in a cutting process at a certain distance from the pressure and suction side along straight control surfaces at a cutting angle varying in correspondence with the blade twist and along a conical surface extending at a certain distance from the annulus surface as well as along transition surfaces between the conical and the control surfaces, and subsequently finish machined by finish milling to produce the final contour of the blade, annulus and transition surfaces. The method reduces tool wear and is cost-effective.

Abstract: With an integrally bladed rotor, material removal is performed from the annulus (5) on a wide, even machining path (8) using the front-side cutting area of an essentially cylindrical cutter head (7). The tool shank (9) is shaped and dimensioned such that it does not collide with the opposite lateral surfaces of the differently curved and twisted blades (4). This type of machining enables an essentially even, smooth annulus surface to be obtained with a reduced number of overlapping machining paths (8). The time required for machining the annulus and the tool wear are reduced. With an annulus machined in accordance with the present invention, the rotor will satisfy high requirements on aerodynamics.

Abstract: A method for the manufacture of a cutting tool provided with a tool holder (1) to which a cutter (2) is separably attached, includes applying a generative production process to a tool base body (3) to create the tool holder (1) with a desired finished shape.