Special gear unit

Abstract

The invention pertains to a special device for the production, preferably by machining, of workpieces with noncircular outer and inner contours such as squares, hexagons, ellipses, polygons and the like, or eccentric circular bores and/or journals. The work tool housing is provided with an uneven transmitting gear unit, with which, by an appropriate change of the path speed of the work tool and its cutting edge, the necessary movement relative to the workpiece can be generated. A gear unit of this type is relatively easily realizable, for example by employment of two unround complementary gearwheels. The unround complimentary gearwheels are constructed or designed as so-called double screw drive gears. Double screw gears with unround wheels have hitherto not been known. They have the advantage that they, with respect to the rolling path, make possible the realization of curves with substantial discontinuities. Besides this they are quite simple to manufacture, for example, using a thread cutting cycle upon a lathe and using a tool device for unround processing as herein described.

1 . Process for the preferably machining processing of workpieces for attainment of unround inner and/or outer contours, as the case may be eccentric arranged round boreholes and/or projections, wherein the workpiece to be processed rotates with constant angular speed about its fixed location axis, while the work tool at its contact point with the workpiece without itself rotating is driven on a circular path axially orbiting, which is tangential to the inner circle of the contour to be produced and is tangential to the circumference from the inside and of which the middle point is exactly in the middle between the inner circumference and outer circumference lying, wherein the rotational speed of the workpiece and the orbiting speed of the work tool are dependent in their path upon each other and the path speed of the work tool during its orbit is so changed, that by the fixed position rotation of the workpiece and the temporal position of the work tool on its circular path produces the desired form shape, thereby characterized, that the desired form shape is produced in multiple processing steps, wherein the work tool after each processing step with a fixed amount is advanced radially against the surface being processed and this cycle is so often repeated until the final measurement is achieved.  
     
     
         2 . Device for carrying out the process according to    claim 1    with a work tool, of which the cutting tip is moveable guided along a circular path, wherein the workpiece selectively directly or by means of a workpiece carrier is secured to a workpiece receptacle, thereby characterized, that the work tool receptacle is connected with the housing of the work tool unit via a adjustment coupling which radial angled relative lengthening prevents an parallel and/or angular relative lengthening permits and selectively the same adjustment coupling or a roller bearing is provided in order to prevent axial relative extensions.  
     
     
         3 . Device according to    claim 2   , thereby characterized, that the calibration or balancing coupling is designed as a cross-slide unit  13 ,  14 ,  15 .  
     
     
         4 . Device according to    claim 2   , thereby characterized, that the balancing coupling is provided in the form a cardanic coupling  30 ,  31 ,  32 .  
     
     
         5 . Device according to    claim 2   , thereby characterized, that the balance coupling is provided as a Oldham-coupling  50 , Wellbellows, Helicoflex-coupling, Schmidt-coupling or the like, and the axial relative movement of the work tool receptacle to the housing of the work tool unit is connected with a roller bearing.  
     
     
         6 . Device according to claims  2 ,  3  or  4 , thereby characterized, that the work tool receptacle extends from a bearing pin  11 ,  28 , which is mounted by means of a bearing  10 ,  27  in a radial or as the case may be eccentric adjustable mounting block  9 .  
     
     
         7 . Device according to claims  2  or  4 , thereby characterized, that the work tool receptacle is formed as a wobble head  29  and with an adjustable angle relative to the rotating driver  23  is pivotably mounted with a mounting shell  26  in ball shape or as the case may be hemispherical in the eccentric adjustable mounting block.  
     
     
         8 . Device according to claims  2  and  5 , thereby characterized, that the workpiece receptacle  47  in at least one angular with respect to the rotating hollow spindle  41  adjustable eccentric hull is mounted, in order to make adjustable the radial position of the workpiece tip.  
     
     
         9 . Device according to    claim 8   , thereby characterized, that the workpiece receptacle  47  is mounted in a eccentric hull pair  44 ,  45  and the eccentric hull pair are rotatable counter to each other via a adjustable drive.  
     
     
         10 . Device according to one of claims  8  or  9 , thereby characterized, that at least one eccentric hull with a conic inner and/or outer surface and a selectively slit is tensionable by means of an axial movement against at least a second hull.  
     
     
         11 . Device according to    claim 9   , thereby characterized, that the outer eccentric hull is provided as a hydraulic clamping hull.  
     
     
         12 . Device according to claims  9  through  11 , thereby characterized, that the adjustable drive is formed of an at least partially toothing of the two eccentric hulls  44 ,  45  (for example ball wheel or crown toothing) and forms a pinion  46  provided in engagement with both eccentric hulls.  
     
     
         13 . Device according to claims  8  through  12 , thereby characterized, that at least one eccentric hull and one further adjacent hull are provided on their outwardly apparent face side with a respective opposing scale.  
     
     
         14 . Device according to one or more of the preceding claims, thereby characterized, that the force or drive transmission path from machine side drive to workpiece unit for workpiece receptacle a wheel drive with unround complimentary roller circles is designed.  
     
     
         15 . Device according to    claim 14   , thereby characterized, that one of the wheels is a hollow gear and the other is a planetary gear.  
     
     
         16 . Device according to claims  14  or  15 , thereby characterized, that the wheels are selectively straight or angularly toothed.  
     
     
         17 . Device according to claims  14  or  15 , thereby characterized, that the drive is a double screw drive.  
     
     
         18 . Device according to one or more of claims  2  through  17 , thereby characterized, that at least one of the roller circles of the unsymmetrical translating drives is at least partial similar to a gimbal (kardioide), and the curve section is substituted by a circle bow section, which transitions tangential in the two sides curve remainder.  
     
     
         19 . Device according to one or more of claims  2  through  18 , thereby characterized, that the housing  1 ,  18 ,  35  and the drive shaft for example in the form of a pinion  5 ,  22 ,  39  or the like is formed compatible to the conventional machine side section position, in order for example that it can be mounted upon the driven station of the revolver of a lathe.  
     
     
         20 . Device according to one or more of claims  2  through  18 , thereby characterized, that the drive shaft is compatible to the conventional machine side cut position of spindles on milling machines (for example steep angle taper SK  30 ,  40 ,  50  and the like) is formed and the housing  1 ,  18 ,  35  via a rotation moment support against the spindle bearing or the machine bed has access.