EXTERNAL ABRASIVE MACHINE

Abstract: An external abrasive machine, in particular an external grinder for removal of material from the outer envelope surface of annular work pieces, and/or from flanges associated therewith, and particularly bearing race rings, and of the type comprising a rotatably driven tool, such as a grinding wheel (18), chucking equipment (14) for a work piece (15) to be machined, and feeding means (10, 11) for causing relative feeding movements between work piece and tool, wherein the machine further comprises a tubular cylindrical housing (3), having a longitudinal cylindrical inner space, said cylindrical inner space (4) having its longitudinal axis offset from the longitudinal axis of said housing, a shaft (7) provided in said inner space (4) and having a recess (7a) in which is arranged a motor (17) coupled to a rotatable work head (16) which together with said chucking equipment is arranged to hold and rotate a work piece to be treated, said shaft being angularly moveable in said space, the housing (3) being enclosed by a rotatably driven outer casing (5), said casing (5) being firmly connected to a lid member (19), having an opening (20) forming at its inner edge a tool, such as a grinding wheel (18), said shaft (7) when being angularly moved in said space displacing the said work head (16) with the work piece (15) in a path allowing the work piece to approach and contact the inner periphery of the tool (18).

Description: EXTERNAL ABRASIVE MACHINE The present invention relates to an external abrasive machine, i.e. a machine tool designed for removing material from the outer envelope surface of a substantially cylindrical or annular work piece and/or from flanges associated therewith, and particularly an external grinding machine for grinding the outer surface and/or flanges of bearing rings and of the type defined in the preamble of the accompanying claim 1. Abrasive machines such as grinding machines, lapping machines, honing machines, milling machines, etcetera, are known in many slightly different designs and embodiments. It is desirous that the machine is compact and as space-saving as possible. For obtaining a good machining result it is on the other hand important that the co-operating parts of the machine have a high mutual stiffness and low tendencies of vibration. These last-mentioned properties are often obtained by giving the machine a heavy bedding and a sturdy and robust design, and therefore these two requirements are often contradictory to the desires for compactness and space-saving properties. The purpose of the present invention is to provide an external abrasive machine which fulfils these, partly contradictory properties, and this has been obtained by giving the machine the features defined in the accompanying claim 1. In this manner it has been possible to achieve very short distances within the machine, which means that inexactness caused in conventional machines, e.g. by thermal influence and material elasticity in long shafts etcetera, is reduced to a minimum, thereby giving the machine a superior precision. Hereinafter the invention will be further described with reference to an embodiment schematically shown in the accompanying drawings. Fig. 1 shows in a longitudinal section a schematical embodiment of the external abrasive machine according to the invention. Fig. 2 is an end view of a portion of the machine as shown in Fig. 1 , Figs. 3 - 6 show diagrammatical cross sections of an end view according to Fig. 2 with the different elements of the machine in different mutual positions, and Fig. 7 shows in bigger scale a portion of the device according to Fig. 1 arranged for machining outer surface and side surfaces of external flanges on a bearing ring. Fig. 1 of the drawing shows schematically the main components of a new external abrasive machine, in the embodiment shown construed as an external grinder according to the present invention. Thus the machine incorporates a frame 1 , in the embodiment intimated, designed as a machine bed having a portion 2 for supporting a cantilever housing, which is designed as an externally cylindrical and substantially tube-shaped elongated member 3 having a longitudinally extending bore 4, which is arranged eccentrically in relation to the longitudinal centre of the cylindrical member 3. The cylindrical member 3 is preferably - although not necessarily - non-rotatably connected to the frame 1. Rotatably supported on the outer envelope surface of the cylindrical member 3 is a rotatable outer member 5, a wheel carriage, which is driven by a motor 6, preferably an electric motor. Inside the eccentric bore 4 of the housing, there is provided a shaft 7 which can be revolved or indexed and displaced axially. This shaft 7 has a portion 8 projecting out from the housing bore 4 in a direction towards the supporting portion 2 of the frame 1, and in the embodiment intimated in the drawing, having smaller diameter than the portion of the shaft 7 received in the housing. The portion 8 of the shaft, thus projecting from the housing is received in a space 9 provided in the portion 2 of the frame 1, and in which space is provided means for revolving the shaft 7, preferably a torque motor 10 and means for axial displacement of the shaft 7, preferably a linear motor 11. The revolving and the axial displacement of the shaft is controlled by sensors 12 and 13 respectively, which preferably are also contained in the space 9 of the frame portion 2. It is evident that the means for revolving and axially displacing the shaft, need not be arranged in a manner as shown in the drawing, but may for instance be contained in a recessed portion of the shaft itself. Supported by the shaft 7 is a carrier 14 for an appropriate and not further shown chuck for a work piece 15, e.g. a bearing race ring, the outer envelope surface of which is to be machined, e.g. ground. At its end opposite its projecting portion 8, the shaft 7 has an inner space 7a (see e.g. Fig. 3), in which is supported a motor 17 with integrated work head 16, and which work head together with the chuck are arranged to clamp therebetween a work piece 15. The rotatable outer member 5, or wheel carriage, which thus is tubular, at its front end, i.e. the end thereof adjacent the free end of the cylindrical member 3, extends slightly outside the cylindrical member 3 and is provided with a fixedly connected, substantially teller-shaped lid member 19 having a centre opening 20 (see Fig. 2). In the embodiment shown in the drawing, the edge of the opening 20 is designed as an annular grinding wheel 18. In operation the grinding wheel 18 rotates together with the outer casing 5 . The carrier 14 for the chuck extends through the opening 20 and the work head 16 projects through this centre opening 20, thus that the work piece 15 retained between the chuck and the work head 16 can be displaced between positions aligned with and inside the lid member 19, following axial movement by the shaft 7, imparted thereto by the linear motor 11. The opening 20 in the lid member 19 is of such a size that it permits the work head and the chuck to pass therethrough with sufficient clearance to allow the shaft 7 - and thereby the work head 16 - to be revolved eccentrically relative to the lid member opening 20, thereby angularly displacing the work head 16 with the work piece 15 in a path allowing it to follow the inner periphery of the grinding wheel 18. For obtaining dressing or trueing of the tool - the grinding wheel 18 - the work head 16 is preferably provided with a dressing or trueing roller 21 causing the grinding wheel 18, or the like to receive a desired or appropriate profile, when the shaft is given a movement in relation to the tool, imparted thereto by the means for revolving and/or axial displacement. It is evident that the chucking method used is of no vital importance for the present invention and anyone of the conventional methods can be used, such as centric chucking, micro-centric chucking or magnetic chucking. In Figs. 3-6 is shown in intimated cross sections different embodiments of how the main components of the abrasive machine according to the invention can be arranged and displaced angularly relative to each other. Fig. 3 thus shows how the main components, outer casing 5, housing 3 and shaft 7, with its inner space 7a are disposed in accordance with the embodiment shown in Fig. 1. In this embodiment the casing 5 rotates about the fixed, non-rotating housing 3, whereas the shaft 7 with aid of its motor 10 (Fig. 1) can be turned relative to the housing. For this purpose the surfaces between housing 3 and casing 5 and between housing 3 and shaft 7 are formed as bearing surfaces 23. As seen from this figure, where the shaft and its inner space 7a is shown without any motor inserted, the space 7a in this embodiment is formed as an oblong bore. Thereby it is possible to insert motors of different size and also to position them at different positions offset from the centre 24 of the housing. From the figure it is also clearly visible how the centre 25 is offset from the centre of the housing. Fig. 4 shows an embodiment, which in the drawing looks alike that of Fig. 3, but which differs slightly in that the shaft 7 can be affixed and angularly immobile, whereas the housing member 3 can be turned relative to the shaft 7. The casing 5 also in this case is rotatable and bearing surfaces 23 are provided between casing 3 and housing 5 and between housing 5 and shaft 7. Fig. 5 shows another possible embodiment, wherein the casing 5 is provided inside an outer fixed structure 26 with a bearing surface 27 provided therebetween. Between the casing 5 and the fixed housing 3 there is in this case no bearing surface but a clearance 28. In the embodiment intimated in Fig. 6 there is provided a fixed outer structure 26 like in the embodiment shown in Fig. 5, but in this case there are provided bearing surfaces 23 also between the outer casing 5 and the housing 5, which last-mentioned is prevented from rotating. Fig. 7 shows in bigger scale a portion of a device in accordance with the device shown in Fig. 1. Thus the machine incorporates a not shown frame supporting a cantilever housing, which is designed as an externally cylindrical and substantially tube-shaped elongated member 3 having a longitudinally extending bore arranged eccentrically in relation to the longitudinal centre of the cylindrical member 3. The cylindrical member 3 is preferably non-rotatably connected to the frame. Rotatably supported on the outer envelope surface of the cylindrical member 3 is a driven rotatable outer member 5, a wheel carriage. Inside the eccentric bore of the housing, is provided a shaft 7 which can be revolved or indexed and displaced axially. Supported by the shaft 7 is a carrier 14 for an appropriate and not further shown chuck for a work piece 15, e.g. a bearing race ring, the wherein external flanges 29 and/or the outer envelope surface of which is to be machined, e.g. ground . The shaft 7 houses a motor 17 with integrated work head, which together with the chuck are arranged to clamp therebetween a work piece 15. The rotatable outer member 5, or wheel carriage, which thus is tubular, at its front end, i.e. the end thereof adjacent the free end of the cylindrical member 3, extends slightly outside the cylindrical member 3 and is provided with a fixedly connected, substantially teller-shaped lid member 19 having a centre opening, the edge of which is designed as an annular grinding wheel 18. In operation the grinding wheel 18 rotates together with the outer casing 5 . The carrier 14 for the chuck extends through the opening and the work head projects through the centre opening 20, thus that the work piece 15 retained between the chuck and the work head can be displaced between positions aligned with, and inside the lid member 19, following axial movement by the shaft 7. The opening in the lid member 19 is of such a size that it permits the work head and the chuck to pass therethrough with sufficient clearance to allow the shaft 7 - and thereby the work head - to be revolved eccentrically relative to the lid member opening 20, thereby angularly displacing the work head 16 with the work piece 15 in a path allowing it to follow the inner periphery of the grinding wheel 18. As shown the side faces of the grinding wheel 18 can machine the side faces of both the external flanges 29 projecting radially from the bearing ring, and the inner envelope surface of the grinding wheel 18 can at the same time or in another machining step cause machining of the outer envelope surface of the work piece 15 between the two flanges thereof. For obtaining dressing or trueing of the tool - the grinding wheel 18 - the work head is also provided with a dressing or trueing roller 21a causing the grinding wheel 18, or the like to receive a desired or appropriate profile, when the shaft is given a movement in relation to the tool, imparted thereto by the means for revolving and/or axial displacement. This dressing of the grinding wheel can be carried trough both for the internal envelope surface of the drinding wheel 18 and for the side faces thereof. The invention is not limited to the embodiment shown in and described in connection to the accompanying drawings, but modifications and variations are possible within the scope of the accompanying claims. The cylindrical housing thus has been shown with a cylindrical inner space, but this space may also have other than a cylindrical shape and the shaft may have any appropriate cross section allowing it to be turned or indexed within the inner space of the housing. The shaft may even be designed as the housing of the very spindle, and it is even possible to substitute the shaft for a system of articulated links or the like capable of turning or indexing the spindle in an appropriate manner.

Claims: CLAIMS 1. An external abrasive machine, in particular an external grinder for removal of material from the outer envelope surface of annular work pieces and/or from flanges associated therewith, particularly bearing race rings, and of the type comprising a rotatably driven tool, such as a grinding wheel (18), chucking equipment (14) for a work piece (15) to be machined, and feeding means (10, 11) for causing relative feeding movements between work piece and tool, characterized therein, that the machine further comprises a tubular cylindrical housing (3), having a longitudinal cylindrical inner space, said cylindrical inner space (4) having its longitudinal axis offset from the longitudinal axis of said housing, a shaft (7) provided in said inner space (4) and having a recess (7a) in which is arranged a motor (17) coupled to a rotatable work head (16) which together with said chucking equipment is arranged to hold and rotate a work piece to be treated, said shaft being angularly moveable in said space, the housing (3) being enclosed by a rotatably driven outer casing (5), said casing (5) being firmly connected to a lid member (19), having an opening (20) forming at its inner edge a tool, such as a grinding wheel (18), said shaft (7) when being angularly moved in said space displacing the said work head (16) with the work piece (15) in a path allowing the work piece to approach and contact the inner periphery of the tool (18). 2. An external abrasive machine as claimed in claim 1 , characterized therein, that the shaft (7) at its end (8) opposite from the said recess is rotatably arranged in a recessed portion (9) of a supporting frame (1,2). 3. An external abrasive machine as claimed in claim 2, characterized therein, that the shaft (7) end (8) projecting into said recessed portion (9) of the supporting frame (1,2) is arranged to be rotated by a torque motor (10) provided in said recessed portion. 4. An external abrasive machine as claimed in claim 2 or 3, characterized therein, that the shaft (7) end (8) projecting into said recessed portion (9) of the supporting frame ( 1 , 2) is axially displaceable by actuation from a linear motor (11). 5. An external abrasive machine as claimed in anyone of the preceding claims, characterized therein, that the recess (7a) in the shaft (7) is shaped in a manner as to allow fitting of work head motors (17) of different size and/or positioning of said motor (17) at different offset positions from the centre of the shaft. 6. An external abrasive machine as claimed in anyone of the preceding claims, characterized therein, that the work head (16) is axially displaceable between positions wherein the work piece (15) is aligned with said opening (20) and positions outside this, by actuation of the linear motor (11). 7. An external abrasive machine as claimed in claim 6, characterized therein, that the work head (16) is equipped with a dressing tool (21,21a), for dressing or trueing the tool (18), when the work head (16) is advanced to a position with the dressing tool (21,21a) approaching and contacting the edge of the tool (18). 8. An external abrasive machine as claimed in claim 6, characterized therein, that the dressing tool is a dressing roller (21) having a profile being a complement to the desired profile of the grinding wheel (18). 9. An external abrasive machine as claimed in claim 6, characterized therein, that the dressing tool is a dressing disc (21 a) for dressing the inner envelope surface of the grinding wheel (18), as well as the side faces thereof. 10. An external abrasive machine as claimed in anyone of the preceding claims, characterized therein, that the housing (3) is fixedly attached to the frame (1,2) and that the rotatable outer casing (5) is driven by a motor (6) carried by the housing. 11. An external abrasive machine according to anyone of the preceding claims, characterized therein, that the shaft (7) is equipped with sensors (11, 12) for controlling the angular and axial movement thereof. 12. An external abrasive machine according to anyone of the preceding claims, characterized therein, that the feeding means for relative feeding movements between work piece and tool are electric motors (10, 11).

Inventors: HEIJKENSKJOELD MATS, HEIJKENSKJOELD, MATS
Applicants: HEIJKENSKJOELD MATS, LIDKOEPING MACHINE TOOLS AB, HEIJKENSKJOELD, MATS
Application year: 1998
Main classification: B24B5
IPC codes: B24B5, B24B19, B24B41, B24B53