Device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on shaft-like workpieces

Abstract

A device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on workpieces, such as crankshafts and camshafts, which have a workpiece axis and several workpiece portions arranged in offset manner along the workpiece axis, has a plurality of finishing units, each of the finishing units having at least one finishing arm with a pressing device for pressing cutting media onto the circumferential surface of a workpiece portion and a finishing unit is associated with each workpiece portion to be machined in a machining phase. The finishing units are subdivided into a first group of first finishing units and a second group of second finishing units, axially directly adjacent finishing units being alternately associated with the first group and the second group and the first group of first finishing units is angularly displaced with respect to the workpiece axis relative to the second group of second finishing units.

1 . Device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on workpieces, which have a workpiece axis and several workpiece portions arranged in offset manner along the workpiece axis, comprising: p 1  a plurality of finishing units, each of the finishing units having at least one finishing arm with a pressing device for pressing cutting compounds onto the circumferential surface of a workpiece portion and a finishing unit is associated with each workpiece portion to be machined in a machining phase,
 wherein the finishing units are subdivided into a first group of first finishing units and a second group of second finishing units, where axially immediately adjacent finishing units are alternately associated with the first group and the second group;   wherein the first group of first finishing units is angularly displaced with respect to the workpiece axis relative to the second group of second finishing units.   
   
   
       2 . Device according to  claim 1 , wherein a maximum width of a finishing unit, measured parallel to the workpiece axis, is greater than the minimum settable spacing between corresponding structural elements of immediately adjacent pressing devices. 
   
   
       3 . Device according to  claim 1 , wherein at least part of the finishing units in the vicinity of the pressing devices has a maximum width of less than 40 mm. 
   
   
       4 . Device according to  claim 3 , wherein the maximum width is 35 mm or less. 
   
   
       5 . Device according to  claim 1 , wherein the finishing units of a group of finishing units are in each case arranged in a row oriented parallel to the workpiece axis. 
   
   
       6 . Device according to  claim 1 , wherein first finishing arms of the first finishing units are set up for machining first workpiece portions arranged coaxially to the workpiece axis and are mounted so as to be linearly displaceable in the radial direction of the workpiece axis. 
   
   
       7 . Device according to  claim 1 , wherein first finishing units only have a single movably mounted finishing arm. 
   
   
       8 . Device according to  claim 1 , wherein first finishing units are placed below a horizontal plane defined by the workpiece axis. 
   
   
       9 . Device according to  claim 1 , wherein first finishing units are placed below a horizontal plane defined by the workpiece axis in such a way that the first finishing arms of the first finishing units perform a substantially vertical displacement movement between a retracted rest position and a machining position with engagement on the workpiece. 
   
   
       10 . Device according to  claim 1 , wherein second finishing units are set up for machining second workpiece portions arranged eccentrically to the workpiece axis and have at least one second finishing arm swivellable about a swivel axis. 
   
   
       11 . Device according to  claim 10 , wherein a second support device for the second finishing units is placed alongside the workpiece in such a way that the swivel axis of the swivel arm is in a horizontal plane with the workpiece axis. 
   
   
       12 . Device according to one  claim 1 , wherein second finishing units only have a single finishing arm in the form of a swivel arm. 
   
   
       13 . Device according to  claim 10 , wherein a swivel arm of a second finishing unit is positioned in such a way that it is oriented substantially horizontally in a machining position and engages from above on workpiece and can be swivelled upwards into a rest position from the machining position with workpiece engagement. 
   
   
       14 . Device according to  claim 1 , wherein first finishing units and second finishing units are so positioned that associated first pressing devices and second pressing devices engage on the workpiece essentially from opposite sides. 
   
   
       15 . Device according to one  claim 1 , wherein the device has a rotating device for producing a rotary movement of the workpiece about workpiece axis, and an oscillating device for producing an oscillating relative movement, oriented parallel to the workpiece axis, between the workpiece and the finishing units. 
   
   
       16 . Device according to  claim 1 , wherein the device is set up as a belt finishing device. 
   
   
       17 . Device according to  claim 1 , wherein at least one pressing device comprises at least one support member for direct support on the workpiece surface and one or more pressing elements supported on the support member for pressing cutting media onto the workpiece surface. 
   
   
       18 . Device according to  claim 17 , wherein the pressing device is a pressing device for a finishing unit for machining a workpiece portion revolving eccentrically about the workpiece axis, 
   
   
       19 . Device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on workpieces, which have a workpiece axis and several workpiece portions arranged in offset manner along the workpiece axis, comprising:
 a plurality of finishing units, each of the finishing units having at least one finishing arm with a pressing device for pressing cutting compounds onto the circumferential surface of a workpiece portion and a finishing unit is associated with each workpiece portion to be machined in a machining phase,   wherein the finishing units are subdivided into a first group of first finishing units and a second group of second finishing units, where axially immediately adjacent finishing units are alternately associated with the first group and the second group;   wherein:   the first group of first finishing units is angularly displaced with respect to the workpiece axis relative to the second group of second finishing units;   first finishing arms of the first finishing units are set up for machining first workpiece portions arranged coaxially to the workpiece axis and are mounted so as to be linearly displaceable in the radial direction of the workpiece axis; and   second finishing units are set up for machining second workpiece portions arranged eccentrically to the workpiece axis and have at least one second finishing arm swivellable about a swivel axis.   
   
   
       20 . Device according to  claim 19 , wherein first finishing units only have a single movably mounted finishing arm. 
   
   
       21 . Device according to  claim 19 , wherein first finishing units are placed below a horizontal plane defined by the workpiece axis in such a way that the first finishing arms of the first finishing units perform a substantially vertical displacement movement between a retracted rest position and a machining position with engagement on the workpiece. 
   
   
       22 . Device according to  claim 19 , wherein second finishing units only have a single finishing arm in the form of a swivel arm. 
   
   
       23 . Device according to  claim 19 , wherein a second support device for the second finishing units is placed alongside the workpiece in such a way that the swivel axis of the swivel arm is in a horizontal plane with the workpiece axis. 
   
   
       24 . Device according  claim 19 , wherein first finishing units and second finishing units are so positioned that associated first pressing devices and second pressing devices engage on the workpiece essentially from opposite sides. 
   
   
       25 . Device for the finish machining of circumferential surfaces of substantially rotationally symmetrical workpiece portions on workpieces, which have a workpiece axis and several workpiece portions arranged in offset manner along the workpiece axis, comprising:
 a plurality of finishing units, each of the finishing units having at least one finishing arm with a pressing device for pressing cutting compounds onto the circumferential surface of a workpiece portion and a finishing unit is associated with each workpiece portion to be machined in a machining phase,   wherein the finishing units are subdivided into a first group of first finishing units and a second group of second finishing units, where axially immediately adjacent finishing units are alternately associated with the first group and the second group;   wherein the first group of first finishing units is angularly displaced with respect to the workpiece axis relative to the second group of second finishing units, and wherein at least part of the finishing units in the vicinity of the pressing devices has a maximum width of less than 40 mm.   
   
   
       26 . Device according to  claim 25 , wherein the maximum width is 35 mm or less. 
   
   
       27 . Device according to  claim 25 , wherein the finishing units of a group of finishing units are in each case arranged in a row oriented parallel to the workpiece axis. 
   
   
       28 . Device according to  claim 25 , wherein first finishing arms of the first finishing units are set up for machining first workpiece portions arranged coaxially to the workpiece axis and are mounted so as to be linearly displaceable in the radial direction of the workpiece axis; and
 second finishing units are set up for machining second workpiece portions arranged eccentrically to the workpiece axis and have at least one second finishing arm swivellable about a swivel axis.