Abstract: A profiling tool (4) is used for profiling or dressing the grinding worm thread, wherein said tool has a simple basic geometric shape, for example in the shape of a rod. The profiling tool (4) has on its active, abrasive surface (6, 7, 8) a transformed topology as needed for the grinding worm (1). The tool passes the grinding worm profile (2) during the profiling process in such a manner that points on the active profiling tool surface are matched in advance and brought into contact with corresponding points on the grinding worm flanks. Thereby topologically modified grinding worms may be essentially profiled faster than in traditional methods.

Abstract: A grinding worm (20) is dressed with a dressing wheel (42), which is moved along the worm path (43) during rotation of the grinding worm (20). The grinding worm as well as the dressing wheel are coupled with rotary encoders (23, 41) and with a servomotor (22, 40) each. The rotation angle of the dressing wheel is coupled by a program with the rotation angle of the grinding worm within the NC control system. Thereby the grinding pattern may be shaped on the tooth flanks (51) of the ground workpiece (50) in such a manner that the ground toothed wheel has an optimum (smooth) running quality.

Abstract: In a housing (1), a hollow shaft (3) is located for rotation, driven by a motor (5). Rigidly attached to the shaft (3) is a pressure vessel (6). Fitted to the shaft (3) inside the vessel (6) is a filter comprising a number of tube-shaped filter elements (9). The liquid to be filtered is fed into an upper chamber (19) of the shaft (3) via an inlet ring (18), and flows through transverse holes (20) into the vessel (6). After passing through the filter (9), the purified liquid is discharged via holes (10) in the hollow shaft (3) through an outlet ring (12). To clean the filter the residual liquid in the vessel (6) is pressed out through the filter with compressed air. Subsequently the deposit adhering to the filter tubes (9) is flung off by rotating the shaft (3) and propelled to the bottom of the vessel by feeding compressed air or clean oil to cleaning nozzles (38). An outlet ring (7) is raised slightly and the deposit at the vessel wall is dried by centrifuging.

Abstract: The device according to the invention for the tailstock end centering and clamping of a rotational workpiece with a circular-cylindrical end comprises a housing with a shank for accommodation in a tailstock barrel, and a chucking pot with a collet located in the housing for rotation about the axis of rotation of the workpiece. In accordance with the invention the collet is closable by way of the axial advancing action of the tailstock, and the axial tailstock thrust effecting the closing and clamping of the collet is transmitted to the workpiece in such manner that it is applied to the center of the workpiece, and the latter is displaceable into the center without friction generating radial sliding of the collet.

Abstract: The process describes how transmission gears (6) can be manufactured in a highly economical and highly precise manner. In one single mounting, the complete hard fine-machining on all of the most important functional surfaces of the workpiece is conducted simultaneously. This multi-process is made possible through the combined use of a continuous generating grinding process for the machining of gearing, a known method for the machining of the boring and possibly of a frontal surface, and the fixing of workpieces (6) on form elements such as chamfers or plane surfaces by means of centering elements (9, 10) which are designed in such a way that they do not block the free access of the individual tools (5, 11, 28) to the surfaces (7, 8, 27) to be machined.

Abstract: The gear consists of a housing (12) to which a drive motor (10) is flanged. Its shaft (1) carries a sun wheel (2) on which multiple planets (3) roll off. The planets (3) are positioned on a planetary carrier (6) which is rigidly connected to the output shaft (9). The shaft (9) is supported in the housing (12) coaxial to the shaft (1). Mounted to the housing (12) is a flange (17) of a cup-shaped annular wheel (8). Its lower rim (16) has a running surface (7) inside, on which the planets (3) roll off. The diameter of the running surface (7) is smaller than the sum of the diameter of the sun wheel (2) and twice the diameter of the planets (3), so that the rim (16) is elastically deformed. The planets (3) are supported rigidly in the circumferential direction and flexibly in the radial direction on the planetary carrier (6). Through this implementation, a backlash-free, rotationally very rigid gear is obtained with which high torques can be transferred in smooth operation.

Abstract: In a first step, the grinding worm profile is dressed according to the requirements of the workpiece that is to be machined. In a second step, the thereby shaped grinding worm, which has been slightly deformed by the effects of the centrifugal force, is measured at operating speed. In a third step, the measured values are converted into control data for a correcting, redressing process of the grinding worm flanks. Finally in a fourth step, the grinding worm flanks are redressed in such a manner that form errors, which are caused by various influences during grinding, are used as correction factors in the machining of the worm profile. The measuring of the grinding worm flanks may be performed directly without contact by means of a distance sensor or indirectly, whereby a sample toothed wheel is ground and this wheel is then measured by means of a tooth-flank measuring machine.

Abstract: In a first step for the purpose of precentering, the dressing too; (27), without axial movement, is brought into contact with the circumference of the rotating grinding worm (11), and those rotary-angle positions of the grinding worm (11) at which the overrunning of the thread gap (36) starts of ends are determined by means of an acoustic-sensor signal and the shaft-angle encoder (18) of the grinding spindle (16). In a second step for the purpose of precision centering, the dressing tool (27) fed into the thread gap (36) is brought into contact with the left-hand and right-hand tooth flanks (38, 39) by axial displacement. In this case, the axial infeed is stopped by means of the acoustic-sensor signal, and the exact grinding-worm thread center is calculated from the contact positions of the dressing tool (27) achieved.

Abstract: The grinding tool comprises a grinding worm flange (2) and a grinding worm (9) for the generative grinding of gears, the flange (2) being provided with location surfaces (5, 6) for the non-clearance fixture to a grinding spindle (1). The flange (2) has an outer, slightly tapered location surface (8). On this the grinding worm (9) with an appropriately tapered bore (10) is located and connected without play to the flange (2). The grinding worm (9) comprises a bearer ring (23) and a grinding body (24), wherein the deformation resistance of the bearer ring (23) is greater than that of the grinding body (24). Centrifugally induced displacements and deformations of the grinding worm (9) are thereby minimized.

Abstract: A radius-forming dressing roll (32) having a frustoconical working region (48) and an adjoining concave-toroidal working region (49) is mounted on the dressing spindle (30) coaxially to a dressing disc (31). In a first step, the flanks (42, 43) of the grinding-worm thread are profiled with the disc (31). After the dressing spindle (30) has been pivoted, the two tip radii (46, 47) and the cylindrical outer circumference (45) are profiled with the dressing roll (32). With little resetting effort and high flexibility, the method permits profiling with short dressing times.

Abstract: The device has a holder (10) in which an arbor (11) is located displaceably in direction z′. The arbor (11) is centralized by springs (15) and damped by damping elements (16). Located on the arbor (11) is a sleeve (18), displaceable in the x-direction at right angles to the z′-direction. The sleeve (18) is centralized by further springs, and damped by damping elements (27). Located for rotation in radial roller bearings (43) on the sleeve (18) is a further ring (44). The axis of rotation (7) is parallel to the z′-direction. Clamped on the ring (44) is a honing tool (6). With this device, vibrations arising during honing can be effectively damped. The machining of the gear is thereby improved, and the honing tool life prolonged.

Abstract: Method and an apparatus for the profiling of single-gear or multiple-gear grinding worms for grinding tooth profiles in accordance with the principle of continuous diagonal hob grinding. A grinding worm is divided into at least two axial segments wherein one segment remains unmodified and a second segment receives, by means of special profiling methods, modifications of the spiral faces for the generation of tooth face modifications. The main attribute of these profiling methods is additional movements, which are superimposed on the disk-shaped profiling tool and/or the grinding worm in relation to a given profiling lift position, and which result in the modifications of the grinding worm faces that are mapped onto the faces of the toothed wheel work during subsequent diagonal hob grinding across a grinding worm segment profiled in this manner.

Abstract: The invention relates to a method for the profiling of single-start or multistart grinding worms for profile grinding of gear-teeth according to the principle of continuous generating grinding. The goal of the proposed profiling principle is to position the profiling tool and/or the grinding worm in relation to each other in such a way that different areas of an axial section of the grinding worm thread (referred to as shape elements) can be profiled with different geometric elements of the active area of a profiling tool (referred to as tool elements). According to the invention, for this purpose, with the aid of a coordination matrix a tool element is coordinated with each shape element of an axial section of the grinding worm thread. The coordination criteria applied in this regard are, in particular, short profiling time and flexible changing of the shape elements.

Abstract: The profiling tool (10) has a segment (12) of a worm thread. Its active zone (13) is coated with grains of hard material (16) and is crowned in cylinder sections coaxial to the tool axis (26). During profiling, the grinding spindle (2) and the tool (10) rotate synchronously. By appropriate correction of the coupling ratio by means of a CNC control when moving the tool (10) in axial direction of the grinding worm (2), the grinding worm flank (1) can be dressed with any desired topology. The method makes it possible to profile topologically modified grinding worms (2) at the grinding worm (2) rotational speed used for grinding, which was previously not possible.

Abstract: In a stand (1), a work-piece spindle (2) is mounted for rotation around a vertical axis (C). On the stand (1), a slide (3) can be shifted horizontally and on the slide, a work-piece carrier (5) can be swivelled around a vertical axis (C1). On the carrier (5), a slide (6) can be shifted vertically. The slide (6) bears a linear guide element (7) able to be swivelled around a horizontal axis (A) and on which a second slide (8) can be shifted. The slide (8) bears the grinding spindle (axis B) with mounted grinding worm (9). A dressing device (12) is arranged, relative to the axis (C1), opposite the work-piece spindle (2). The machine makes easy operation possible, because all parts to be operated are quite accessible.

Abstract: The device has a work-piece spindle (3) that can be shifted parallel to the spindle axis (C'). On it, in addition to the work-piece toothed wheel, at least one toothed dressing wheel is mounted on which the globoid grinding worm (10) is periodically dressed. On a tool-changer (12), a toothed honing wheel (18) is lodged rotatably on an additional arm (16); with it, the work-piece toothed wheel is honed after grinding. The toothed honing wheel (18) is dressed on the same or a second toothed dressing wheel. The device makes possible an efficient fine machining of toothed wheels.

Abstract: The conical internal teeth (7) of a spur gear grinding tool (2) mesh with the teeth (6) of a spur gear workpiece (1) or a dressing spur gear. The tool axis (4) forms an acute angle (.gamma.) with the workpiece axis (3). To grind and to dress, the spur gear tool (2) is fed relative to the workpiece (1) in the direction of the tool axis (4). In this manner an optimal tooth meshing between the tool (2) and the workpiece (1) over a wide dressing range and a constant finishing are achieved.

Abstract: A tool 1 comprises a single rib dressing roll 5 and two semi-rib dressing rolls 10, 11 separated by spacers 13. The two flanks 31, 33 of a first lead 32 of a grinding worm 30 are dressed by the two flanks 6, 7 of the single rib dressing roll, and the two flanks 35, 38 of a second lead 36 are dressed by the two flanks 14, 16 of the semi-rib dressing rolls. Fast dressing with a long service life and a short dressing stroke are thus obtained.

Abstract: A contouring tool for grinding cylindrical worm profiles includes two disks 46, 47 having hard grain coated surfaces 48, 49 for contouring the opposing flanks 3, 4 of the grinding worm 1. Hard grain coated parts 50, 52, which are provided for contouring the root and crest sections 5, 6 that directly adjoin the flanks 3 to be dressed with one disk 47, are mounted on the other disk 46. The surfaces 48, 49 can thus be lapped. A grinding worm 1 can be contoured in one operation with this tool.

Abstract: A process for controlling the tool infeed prior to machining a semi-machined gear comprises aligning the tool with the gear and feeding the tool radially inwardly in rapid traverse without making contact with the gear. The continuous rotating tool is then fed in incrementally in intervals of at least one gear revolution until the tool touches the gear for the first time. At this time the machining process is started.