Abstract: The invention relates to a method for machining a workpiece, preferably of a gear, with a multiple thread worm-shaped cutting tool with several parallel running helical and ridge-shaped cutting edges. To obtain a higher quality of the machining operation the invention proposes the following steps for the method: a) Bringing the cutting tool with the workpiece into mesh by inserting of a first helical cutting edge of the cutting tool in a first gap of the workpiece which has to be machined or has to be produced and machining of the workpiece with the cutting tool in this contact situation; b) Bringing the cutting tool and the workpiece out of mesh; c) Bringing the cutting tool with the workpiece again into mesh by inserting of the first helical cutting edge of the cutting tool in a second gap of the workpiece which is different from the first gap and machining of the workpiece with the cutting tool.

Abstract: A dressing tool produces a plurality of first radial sections in a first flank of a first screw channel in a grinding worm, and a plurality of second radial sections in a second flank of a second screw channel in the grinding worm. Each radial section extends only a portion of a total radial height of the respective flank, the portion being less than the total radial height of the respective flank. Each first radial section in the first screw channel is radially displaced with respect to a corresponding second radial section in the second screw channel.

Abstract: The invention relates to a method for machining a workpiece, preferably of a gear, with a multiple thread worm-shaped cutting tool with several parallel running helical and ridge-shaped cutting edges. To obtain a higher quality of the machining operation the invention proposes the following steps for the method: a) Bringing the cutting tool with the workpiece into mesh by inserting of a first helical cutting edge of the cutting tool in a first gap of the workpiece which has to he machined or has to be produced and machining of the workpiece with the cutting tool in this contact situation; b) Bringing the cutting tool and the workpiece out of mesh; c) Bringing the cutting tool with the workpiece again into mesh by inserting of the first helical cutting edge of the cutting tool in a second gap of the workpiece which is different from the first gap and machining of the workpiece with the cutting tool.

Abstract: The invention relates to a method for the grinding of a profile (1) of a workpiece (2) with a gear or profile grinding machine (3), wherein the profile (1) which has to be ground is successively at first ground during a roughing operation with a roughing grinding tool (4) and is afterwards ground during a finishing operation with a finishing grinding tool (5), wherein a stock of the profile (1) which has to be removed is ground by the roughing and the finishing operation, wherein the roughing grinding tool (4) and the finishing grinding tool (5) are arranged coaxially on a common tool spindle (6) or on two separate tool spindles and wherein a translational movement is created between the grinding tools (4, 5) and the workpiece (2) in a direction of a first axis (x) for carrying out a grinding stroke.

Abstract: The invention relates to a method for the operation of a gear or profile grinding machine (1) for the grinding of pre-geared or pre-profiled workpieces (2), wherein the machine comprises at least one tool spindle (3) which can carry at least one grinding tool (4) and wherein the machine comprises at least two workpiece spindles (5, 6) which can at least temporarily be driven to the tool spindle (3) for cooperation of the workpiece (2) with the grinding tool (4). To improve the ratio between primary processing time and secondary processing time the invention proposes that the at least two workpiece spindles (5, 6) are pivoted around a respective axis of rotation (7, 8) for transportation from a grinding position (I) to a loading station (II) and vice versa, wherein the rotation of the two workpiece spindles (5, 6) takes place independently from another. Furthermore, the invention relates to a gear or profile grinding machine.

Abstract: The invention relates to a hard finish machine (1) for hard finishing of a workpiece (2), comprising at least two different hard finish tools (3, 4) which are arranged on a tool spindle (5), wherein the tool spindle (5) is arranged movable in the direction (Y) of its axis (6) on a tool carrier (7), wherein the tool carrier (7) is translational movable relatively to a machine bed (8) and wherein the hard finish machine furthermore comprises cooling lubricant supplying means (9) for the supply of cooling lubricant to the machining region between the workpiece (2) and the hard finish tool (2, 3).

Abstract: The invention relates to a hard finish machine (1) for hard finishing of a workpiece (2), comprising at least two different hard finish tools (3, 4) which are arranged on a tool spindle (5), wherein the tool spindle (5) is arranged movable in the direction (Y) of its axis (6) on a tool carrier (7), wherein the tool carrier (7) is translational movable relatively to a machine bed (8) and wherein the hard finish machine furthermore comprises cooling lubricant supplying means (9) for the supply of cooling lubricant to the machining region between the workpiece (2) and the hard finish tool (2, 3).

Abstract: The invention relates to a method for dressing of a multiple thread grinding worm, wherein the contour of the flanks of the screw channels which are running spiral-like and parallel to another is produced by a dressing tool. To obtain an improved grinding result especially with reduced dressing time the invention proposes that in at least two screw channels contours of the flanks are produced, which are distinguished from another by their geometry and/or by their surface structure. Furthermore, the invention relates to a method for grinding of a work piece and a grinding worm.

Abstract: The invention relates to a method for the production of a rotor of a rotary screw compressor (1) with a cylindrical basic shape, which has a helical profile (2) at its outer circumference, wherein the method comprises the steps of: a) Pre-processing of the workpiece (1) by bringing in the profile (2), wherein the profile (2) has a stock compared with the finished shape, b) Pre-grinding of the profile (2) by a rough-machining process in a grinding machine, wherein a part of the stock is removed and c) Finish-grinding of the profile (2) by a finish-machining process in the grinding machine, wherein the remainder of the stock is removed and the finished shape of the profile (2) is produced. To improve the efficiency of the production especially of rotors of rotary screw compressors and ensure a high quality of the production the invention is characterized in that the pre-grinding and/or the finish-grinding is carried out with a grinding worm (3) by a continuous generative grinding process.

Abstract: The invention relates to a method and machine for the dressing of a grinding tool (1), which has at least one tooth-shaped profile (2) with a first flank (3) and an opposing second flank (4). A disk-shaped dressing tool (5) used for dressing of the grinding tool (2) has a first abrasive area (6) and a second abrasive area (7). To allow a faster and thus more economical dressing of the grinding tool, the first abrasive area (6) contacts the first flank (3) and the second abrasive area (7) contacts the second flank (4) simultaneously, and the disc-shaped dressing tool (5) and/or the grinding tool (1) are pivoted relatively to another around an axis (A) being arranged perpendicular to the axis of rotation (C) of the grinding tool (1), so that both flanks (3, 4) are dressed simultaneously.

Abstract: The invention relates to a method for the grinding of a profile (1) of a workpiece (2) with a gear or profile grinding machine (3), wherein the profile (1) which has to be ground is successively at first ground during a roughing operation with a roughing grinding tool (4) and is afterwards ground during a finishing operation with a finishing grinding tool (5), wherein a stock of the profile (1) which has to be removed is ground by the roughing and the finishing operation, wherein the roughing grinding tool (4) and the finishing grinding tool (5) are arranged coaxially on a common tool spindle (6) or on two separate tool spindles and wherein a translational movement is created between the grinding tools (4, 5) and the workpiece (2) in a direction of a first axis (x) for carrying out a grinding stroke.

Abstract: The invention relates to a grinding machine for grinding of a gear or of a gear-like workpiece, which has a grinding worm (1) with a tooth-shaped profile (2), which consists at least partly from a dressable abrasive material and which is arranged rotatably on a grinding spindle, so that it can rotate around an axis of rotation (C) during grinding and a dressing device (3), with which at least a part of the forming areas (4, 5) of the grinding worm (1) can be profiled, wherein the dressing device (3) has a dressing spindle (6), which bears a disk-shaped dressing tool (7), so that it can rotate around an axis of rotation (B). To allow a faster dressing of the grinding worm the invention is characterized in that the grinding machine further has a dressing bar (8) which has a dressing edge (9), wherein the form of the dressing edge (9) corresponds at least partly to the ideal envelope of the grinding worm (1).

Abstract: The invention relates to a hard finish machine (1) for hard finishing of a workpiece (2), comprising at least two different hard finish tools (3, 4) which are arranged on a tool spindle (5), wherein the tool spindle (5) is arranged movable in the direction (Y) of its axis (6) on a tool carrier (7), wherein the tool carrier (7) is translational movable relatively to a machine bed (8) and wherein the hard finish machine furthermore comprises cooling lubricant supplying means (9) for the supply of cooling lubricant to the machining region between the workpiece (2) and the hard finish tool (2, 3).

Abstract: The invention relates to a hard finish machine (1) for hard finishing of a workpiece (2), comprising at least two different hard finish tools (3, 4) which are arranged on a tool spindle (5), wherein the tool spindle (5) is arranged movable in the direction (Y) of its axis (6) on a tool carrier (7), wherein the tool carrier (7) is translational movable relatively to a machine bed (8) and wherein the hard finish machine furthermore comprises cooling lubricant supplying means (9) for the supply of cooling lubricant to the machining region between the workpiece (2) and the hard finish tool (2, 3).

Abstract: The invention relates to a method for the operation of a gear or profile grinding machine (1) for the grinding of pre-geared or pre-profiled workpieces (2), wherein the machine comprises at least one tool spindle (3) which can carry at least one grinding tool (4) and wherein the machine comprises at least two workpiece spindles (5, 6) which can at least temporarily be driven to the tool spindle (3) for cooperation of the workpiece (2) with the grinding tool (4). To improve the ratio between primary processing time and secondary processing time the invention proposes that the at least two workpiece spindles (5, 6) are pivoted around a respective axis of rotation (7, 8) for transportation from a grinding position (I) to a loading station (II) and vice versa, wherein the rotation of the two workpiece spindles (5, 6) takes place independently from another. Furthermore, the invention relates to a gear or profile grinding machine.

Abstract: The invention relates to a hard finish machine (1) for hard finishing of a workpiece (2), comprising at least two different hard finish tools (3, 4) which are arranged on a tool spindle (5), wherein the tool spindle (5) is arranged movable in the direction (Y) of its axis (6) on a tool carrier (7), wherein the tool carrier (7) is translational movable relatively to a machine bed (8) and wherein the hard finish machine furthermore comprises cooling lubricant supplying means (9) for the supply of cooling lubricant to the machining region between the workpiece (2) and the hard finish tool (2, 3).

Abstract: The invention relates to a method for the production of a rotor of a rotary screw compressor (1) with a cylindrical basic shape, which has a helical profile (2) at its outer circumference, wherein the method comprises the steps of: a) Pre-processing of the workpiece (1) by bringing in the profile (2), wherein the profile (2) has a stock compared with the finished shape, b) Pre-grinding of the profile (2) by a rough-machining process in a grinding machine, wherein a part of the stock is removed and c) Finish-grinding of the profile (2) by a finish-machining process in the grinding machine, wherein the remainder of the stock is removed and the finished shape of the profile (2) is produced. To improve the efficiency of the production especially of rotors of rotary screw compressors and ensure a high quality of the production the invention is characterized in that the pre-grinding and/or the finish-grinding is carried out with a grinding worm (3) by a continuous generative grinding process.

Abstract: The invention relates to a hard finishing machine (1). The machine has one tool (4) which is arranged on a tool spindle (3) and a rotary table (5) with an axis of rotation (6) which is aligned vertically, and a workpiece spindle (7) arranged on the rotary table (5) which carries the workpiece (2). To increase the flexibility of the machine, the rotary table (5) has a first rotational position (I) in which the workpiece (2) can be machined by the tool (4), a second rotational position (II) where the workpiece is loaded on the workpiece spindle (7) at a first station (8), and a third rotational position (III) where the workpiece is unloaded at a second station (9).

Abstract: The invention relates to a hard finishing machine (1). The machine has one tool (4) which is arranged on a tool spindle (3) and a rotary table (5) with an axis of rotation (6) which is aligned vertically, and a workpiece spindle (7) arranged on the rotary table (5) which carries the workpiece (2). To increase the flexibility of the machine, the rotary table (5) has a first rotational position (1) in which the workpiece (2) can be machined by the tool (4), a second rotational position (II) where the workpiece is loaded on the workpiece spindle (7) at a first station (8), and a third rotational position (III) where the workpiece is unloaded at a second station (9).

Abstract: The invention relates to a method and machine for the dressing of a grinding tool (1), which has at least one tooth-shaped profile (2) with a first flank (3) and an opposing second flank (4). A disk-shaped dressing tool (5) used for dressing of the grinding tool (2) has a first abrasive area (6) and a second abrasive area (7). To allow a faster and thus more economical dressing of the grinding tool, the first abrasive area (6) contacts the first flank (3) and the second abrasive area (7) contacts the second flank (4) simultaneously, and the disc-shaped dressing tool (5) and/or the grinding tool (1) are pivoted relatively to another around an axis (A) being arranged perpendicular to the axis of rotation (C) of the grinding tool (1), so that both flanks (3, 4) are dressed simultaneously.