FR2663871A1 - DEVICE FOR EBARBER OR BREAKING TOOTH KNIVES ON THE FRONTAL FACES OF TEETH OF STRAIGHT OR STRAIGHT TOOTHED WHEELS BY MACHINING WITH OR WITHOUT REMOVING CHIPS. - Google Patents

Abstract

a) Device for deburring or breaking the teeth edges on the front faces of teeth of straight or inclined toothed wheels by machining with or without chip removal. b) Device characterized in that at least one secondary steel deburring tool (10, 20) is integrated into a workpiece housing, coaxial with the axis (3) of the workpiece, in a non-rotating but movable manner as a gimbal and resiliently in the axial direction, with a tool holder (16, 26) capable of being pressed against the workpiece (W). c) The invention relates to a device for deburring or breaking the edges of teeth on the front faces of teeth of straight or inclined toothed wheels by machining with or without chip removal.

Description

i "Machining device for deburring or breaking the edges of the teeth on

  The invention relates to a device for deburring or breaking the edges of the teeth on the end faces of teeth of straight or inclined toothed wheels by machining with or without chip removal, for toothed gears. straight or inclined toothing (constituting the parts), device10 comprising: at least one tool meshing with the rotatably mounted part, machining the tooth flanks in the manner of a toothed wheel, with a guide wheel meshing with the workpiece and driving it, at least one tool comprising a knife and cooperating with a front face of the part to remove the

  secondary barbs (secondary trimming steels).

  The state of the art relating to the present invention is for example defined by the document DE-Gbm 83 07 877 In this document, using tools similar to gear wheels and which comprise on both sides a wheel the guide gear meshes with the toothed wheel constituting the workpiece, the front knives of the tooth flanks are deburred and in the zone of the bottom of the teeth, including the intermediate transitions, or the knives are broken and the barbs which remain in these are removed. areas or protruding from the size of the teeth The secondary deburring resulting from this machining of the front faces of the toothed wheel is removed by cutting discs applied against these end faces These cutting discs, however, do not allow remove secondary barbs only on parts whose frontal surfaces of the teeth are

  perpendicular to the axis of the piece.

  However, in practice, it often happens that it is necessary to deburr the toothed wheels whose front surfaces of the teeth are inclined relative to the axis of the workpiece. For such workpieces, it is necessary for the position of the cutting knives to correspond to the inclination of the front surfaces, independently of the angle of inclination of these front surfaces, to make suitable deburring tools and which are similar to known steels steels To be able to use such a deburring tool universally, it has already been proposed to associate a knife support with a ball joint

  adjustable in rotation and angle (DE-Gbm 31 34 544).

  However, these tools are not suitable for removing secondary barbs on heavily stressed gears: in fact, in the intervals of teeth that pass over the cutting knives, there are cutting conditions which vary constantly and in the extreme case has interrupted cuts, resulting in grooves and marks on the front faces of the teeth; the consequence is the formation of hardening cracks and breaks in operation. In addition, the knives with inclined front surfaces are not directed radially to the axis of the workpiece but inclined in the circumferential direction on a surface. conical envelope surface defined by the inclined front surfaces, which is actually possible exactly by implementing exceptionally important manufacturing means (it is necessary that the cutting knife is concave to apply against the

conical envelope surface).

  From this state of the art, the present invention aims to develop a device of the type defined above so that the knives of the secondary deburring tool can be adapted exactly to a possible inclination of the front surface of the teeth. and allow to create

a perfect surface on the piece.

  To this end, the invention relates to a device of the type defined above, characterized in that at least one secondary deburring steel is integrated in a part housing, coaxial with the axis of the part, in a non-rigid manner. rotatable but movable as a cardan and resiliently in the axial direction, with a tool support that can be applied against

the room.

  The reception of secondary trimming steels

  In the non-rotating tool holders, provided coaxially with the axis of the workpiece, simple grinding of the cutters is possible, for example in a grinder which has a shape corresponding to the conical envelope surface mentioned above. a gimbal of the tool holder gives in connection with its suspension, a reliable permanent application of

knives against the piece.

  According to another advantageous characteristic

  According to the invention, for the housing of the part the device comprises two non-rotating supports, axially sliding in the manner of doll pins, a support, one of which includes a first adapter mounted to rotate, designed to receive and support the workpiece. and the other is designed to axially hold the piece with a second

  adapter rotatably mounted and elastically axially.

  This corresponds to a simple realization of the means of

receiving the piece.

  According to another advantageous characteristic

  of the invention, the device comprises at least one tool holder mounted on a support with at least one

  secondary deburring steel, centering the carrier

  tool being made by one or more annular knives or bead allowing a gimbal-type mobility This corresponds to a provision

appropriate room support.

  According to another advantageous characteristic

  se of the invention, the device comprises at least one rod, fixed, a free end through a bore of the tool holder and does not interfere with cardan-type mobility, the end of which the end of the rod reaches the vicinity of the It also corresponds to a suitable arrangement for removing the trimmed piece. For adjusting the gimbal-type motion of the workpiece support, it is advantageous according to the invention in that in addition to at least one secondary deburring steel whose edge mills the workpiece at the front surfaces of teeth. it has additional support knives on the work support or in the workpiece supports and which under the action of a spring force (compression spring) are applied against a flat surface of

the room.

  According to another characteristic of the invention three support knives are provided each time to a support and the support knives have an angle

clearance equal to O.

  Even if with a secondary deburring steel for each tool holder is obtained good results, it is possible to further improve these results if each tool holder has at least three steels

secondary deburring.

  The grinding of the knives is in this case

also simpler.

  According to another characteristic of the invention, the knives of the secondary deburring steels are located on a conical envelope surface defined by the inclined portions of the surfaces.

frontal of the teeth.

  According to another characteristic of the invention, the knives of the secondary trimming steels or the pressing knives are provided each time at an angle with respect to a radius extending from the axis of the piece, so that the chip removal always takes place from one point radially outwards to a point radially inside. This allows

  significantly improve the outcome of operations

  rations. The present invention will be described hereinafter with the aid of an exemplary embodiment shown in the accompanying drawings, in which: FIG. 1 is a longitudinal section of the device of the invention, FIG. 2 is a transverse section along line II; FIG. 3 is a longitudinal section similar to FIG. 1 but in another sectional plane and removing details that appear

already in Figure 1.

  For deburring the end faces of the knives of the teeth of a toothed wheel (workpiece W), there is a deburring tool 1, known and which for this reason is shown only schematically; this tool consists of two tools 31, 32 similar to a toothed wheel, which work the tooth flanks with or without removal of chips; between these two tools is a guide wheel 33 The deburring tool 1 is rotated by

  means not shown and this tool entails

  even by the guide wheel 33, the part W which is engaged in the drawing, it is a gear wheel of a gearbox provided with a bore 34 by which it is mounted in a machining machine not shown, between two dolls 12, 22 with pins 13, 23 or similar means, non-rotating but capable of sliding axially One of the pins 13 is provided with a fixing member 14 to which is attached a free adapter 15 in rotation and which is adapted to the bore 34 of the piece so as to carry the piece W The other pin 23 is provided with a support 24 receiving free rotation, a pin 4 with an adapter 25 and which under the effect of a stud 7 and / or a device that slides the pin 23, axially blocks the workpiece W.

  Each support 14, 24 is provided with a holder

  annular tool 16, 26 locked in rotation by a respective pin 7 The tool holders 16, 26 are centered by a peripheral edge 17 in the manner of a knife support or by a peripheral bead 27 with respect to the supports 14, 24 for ability to move within certain limits, in the manner of a cardan and also axially under the effect of the springs 8; studs 7 do not interfere

this movement.

  Secondary deburring steels 10, 20 are housed in the tool holders 16, 26 and are clamped therein so that their knives 19, 29

  apply against inclined surfaces, ie

  between the front surfaces 35, 36 teeth which are inclined relative to the plane of rotation of the workpiece W The knives are arranged obliquely at an angle α relative to a radius R so as to always be in contact with the workpiece W and This inclined position requires knives 19, 29 slightly concave so that they fully apply to the conical envelope passing through the front surfaces of the teeth. chip removal thus passes from a point radially outwardly to a point radially inward to remove the secondary beard, with safety of the tooth and to drive it if necessary on a flat surface Pl, P 2 where the beard is then

  removed to be eliminated completely.

  In addition to the secondary stripping steels 10, 20, the tool holders 16, 26 also comprise support knives 11, 21 which are applied under the effect of compression springs 6 against the flat surfaces P 1, P 2 of the workpiece W and thus perform a dual function These knives serve, on the one hand to adapt the setting of the tool holders 16, 26 against the workpiece W, or to avoid any nutation movements, so that the steels 2, 20 or their knives 19, 29 are always in a correct position with respect to the front surfaces 35, 36 of the teeth and so that any secondary beard residues can be removed from the flat surfaces Pi, P 2 or to give the flat surfaces Pi, P 2 a better surface structure To take these requirements into account, these knives have an angle of clearance of only 0, that is to say that they function more smoothly than at the cut Like the knives 19, 29, they are skew with respect to a radius R 'with an angle "so that here also the removal of the chip is from a point radially outwards to a point radially inwards. Given the necessary suspension, the position support knives 11, 21 can not be guaranteed by clamping as for the secondary trimming steels 10, 20 but by application against a corresponding surface of the

  stops 9 which define the course of the spring.

  The installation described above operates as follows: The workpiece W is in the machining position on the adapter 15 The spindle 23 with the adapter 25 is pushed against the end faces 35, 36 of the teeth of the workpiece W up to the knives 19, 29 are in abutment and the piece W is axially locked by compression by the adapter 25 against a flange of the adapter 15 The width tolerances of the part W are compensated by the spring 5 or by the springs 8 which allow some extension of the movement of the pins, even when the knives 19, 29 are already applied Already before, the support knives 11, 21 are applied against the flat surfaces Pi, P 2 where they can escaping against the force of the compression spring 6 when the movement of the pins is not completed and o they serve by their guidance on the tool holder 16, 26 to allow the adjustment of the knife 17 or the bead 27 so that the or the knives 19, 29 can To compensate for any nutation failure of the workpiece W or an inclined position of the workpiece For this purpose, it has advantageously provided on each side three support knives 11, 21. For after the deburring operation, it is possible to extracting the piece W without difficulty from the adapter 15 or the adapter 25 which has only a short centering means, the dolls 12, 22 are mounted on bars 18, 28 fixed with respect to the axis 3 of the piece and whose respective free end passes through the workpiece carriers 16, 26 with radial clearance reaching a small axial distance from the workpiece. When removing the pins 13, 23, the workpiece W bears against a bar that

remove it from its adapter.

  If one of the tool holders 16, 26 and these secondary trimming steels 10, 20 and the support knives 11, 21 are removed, the device can also be applied to parts requiring only the deburring of only one face or the rounding of the knives with removal of the secondary barbs In the case of parts with frontal surface of teeth not inclined, the secondary trimming steels 10, 20 may also be aligned parallel to the axis 3 of the It turned out, however, that with three secondary trimming steels on each side of the workpiece, excellent machining results were achieved, but a smaller or larger number of steels could also be achieved. deburring but this complicates the grinding of the concave knives 19, 29 adapted to the conical envelope surface mentioned above, especially when there is only one steel

  secondary deburring by tool holder.

Claims (9)

  1) A machining device for deburring or breaking the front edges of the teeth of the toothed wheels with straight or inclined toothing (constituting the parts), comprising: at least one tool meshing with the rotatably mounted part, machining the tooth flanks to the way a toothed wheel, -   with a guide wheel meshing with the workpiece and driving the latter, at least one tool comprising a knife and cooperating with a front face of the workpiece to remove the secondary barbs (secondary trimming steels), characterized in that at least one secondary deburring steel (10, 20) is integrated in a part housing (2), coaxial with the axis (3) of the part, non-rotatively but movable as a universal joint and resiliently in the direction axial, with a tool support (16, 26) capable of being applied against the workpiece (W).   2) Device according to claim 1, characterized in that for the housing of the part (2) it comprises two supports (14, 24) non-rotating, axially sliding in the manner of pins dolls, support one of which (14 ) comprises a first rotatably mounted adapter (15) adapted to receive and support the workpiece (W) and the other (24) for axially holding the workpiece (W) with a second adapter (25) mounted to rotation and elastic axially.   3) Device according to claim 2, characterized by at least one tool holder (16, 26) mounted on a support (14, 24) with at least one steel   secondary deburring (10, 20), centering the carrier   it tool (16, 26) being made by one or more annular knives (17) or bead (27) allowing cardan mobility.   4) Device according to one of the claims   previous, characterized by at least one rod (18, 28), fixed, a free end passes through a bore of the tool holder (16, 26) and does not interfere with cardan-type mobility, the stem of which the front end arrives until 'in the vicinity of the room (W) and   constitutes a scraping member of the part.   ) Device according to any one of   Claims 1 to 4, characterized in that in addition   at least one secondary deburring steel (10, 20) whose edge mills the workpiece (W) at the end surfaces of teeth, it has additional support knives (11, 21) on the support of workpiece or in the workpieces (16, 26) which under the action of a spring force (compression spring 6) are applied against a flat surface (Pi, P 2) of the piece (W).   6) Device according to any one of   Claims 1 to 5, characterized in that at each   once a support (14, 24) we have three support knives (11, 21).   7) Device according to any one of   claims 5 and 6, characterized in that the   support knives (11, 21) have a clearance angle equal to 0.   8) Device according to any one of   Claims 1 to 7, characterized by each time   three secondary trimming steels (10, 20) provided   in the tool holder (s) (16, 26).   9) Device according to any one of   claims 1 to 8 for working parts to   front surfaces of angled teeth, characterized in that the knives of the secondary deburring steels (10, 20) are on a conical envelope surface defined by the parts   inclined front surfaces of the teeth.   10) Device according to any one of   Claims 1 to 9, characterized in that the   of the secondary trimming steels or steels (10,) and the supporting knives (11, 21) are provided each time at an angle (a, f) with respect to a radius (R) extending from the axis ( 3) from the workpiece so that chip removal always takes place from a point radially outward to a point radially inward.