Source: http://www.google.com/patents/US5295076?dq=inventor:%22Arthur+R.+Hair%22
Timestamp: 2015-01-25 23:22:34
Document Index: 231994611

Matched Legal Cases: ['art, 1973', 'art, 1973', 'art, 1972', 'art, 1972', 'art, 1978', 'art, 1978']

Patent US5295076 - Machine for the non-circular machining of workpieces - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsIn order to so improve a machine for the non-circular machining of workpieces comprising a machine frame, a workpiece spindle held on the machine frame for receiving a workpiece and having a C-axis sensor, a Z-slide displaceable parallel to the workpiece spindle and having a Z-axis sensor, an X-axis...http://www.google.com/patents/US5295076?utm_source=gb-gplus-sharePatent US5295076 - Machine for the non-circular machining of workpiecesAdvanced Patent SearchPublication numberUS5295076 APublication typeGrantApplication numberUS 07/766,752Publication dateMar 15, 1994Filing dateSep 27, 1991Priority dateOct 2, 1990Fee statusLapsedAlso published asDE4031079A1, DE4031079C2, EP0479026A1Publication number07766752, 766752, US 5295076 A, US 5295076A, US-A-5295076, US5295076 A, US5295076AInventorsGuenther Gruener, Werner Philipp, Hans PikischOriginal AssigneeEx-Cell-O GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (7), Non-Patent Citations (12), Referenced by (7), Classifications (7), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMachine for the non-circular machining of workpiecesUS 5295076 AAbstract In order to so improve a machine for the non-circular machining of workpieces comprising a machine frame, a workpiece spindle held on the machine frame for receiving a workpiece and having a C-axis sensor, a Z-slide displaceable parallel to the workpiece spindle and having a Z-axis sensor, an X-axis drive arranged on the Z-slide for advancing a tool towards the workpiece, an X-axis sensor for determining the position of the tool, and a control device, that it operates quickly and reliably, it is proposed that the control device comprise a numerical machine control system for activating the workpiece spindle and the Z-axis drive and include a numerical X-axis control system, that the X-axis control system activate the X-axis drive independently of the machine control system in accordance with the predetermined non-circular shape, and that a coordination take place between the machine control system and the X-axis control system after certain time intervals.
What is claimed is: 1. A machine for the non-circular machining of workpieces comprising:a machine frame; a workpiece spindle held on said machine frame for receiving a workpiece; a C-axis sensor for determining rotary positions of said workpiece spindle; a Z-slide arranged on said machine frame for displacement in a Z-direction parallel to said workpiece spindle and having a Z-axis drive; a Z-axis sensor for determining a position of said Z-slide; an X-axis drive arranged on said Z-slide for advancing a tool in an X-direction towards said workpiece; an X-axis sensor for determining a position of said tool; and a control device for activating said X-axis drive to produce a predetermined non-circular workpiece shape; said control device comprising a numerical machine control system for activating said workpiece spindle and said Z-axis drive; said control device further comprising a numerical X-axis control system for activating said X-axis drive independently of said numerical machine control system via successive actuating variables; said numerical X-axis control system calculating said successive actuating variables in successive calculation routines on the basis of (i) actual position values measured by said C-axis sensor, (ii) actual position values measured by said X-axis sensor, and (iii) stored data defining said predetermined non-circular shape; said numerical machine control system and said numerical X-axis control system being coordinated after a predetermined number of calculation routines. 2. A machine as defined in claim 1, wherein said numerical X-axis control system controls said X-axis drive in response to a further actual value measured by said Z-axis sensor and determined by said numerical X-axis control system.
BACKGROUND OF THE INVENTION The invention relates to a machine for the non-circular machining of workpieces comprising a machine frame, a workpiece spindle held on the machine frame for receiving a workpiece, a C-axis sensor for determining the rotary positions of the workpiece spindle, a Z-slide arranged on the machine frame for displacement in the Z-direction parallel to the workpiece spindle and having a Z-axis drive, a Z-axis sensor for determining the position of the Z-slide, an X-axis drive arranged on the Z-slide for advancing a tool in the X-direction towards the workpiece, an X-axis sensor for determining the position of the tool, and a control device for activating the X-axis drive in dependence upon the values measured by the C-axis sensor, the Z-axis sensor and the X-axis sensor such that a non-circular workpiece shape predetermined for the control device is produced during the machining.
SUMMARY OF THE INVENTION This object is accomplished in accordance with the invention in a machine of the kind described at the beginning by the control device comprising a numerical machine control system for activating the workpiece spindle and the Z-axis drive and including a numerical X-axis control system, by the X-axis control system activating the X-axis drive independently of the machine control system in accordance with the predetermined non-circular shape, and by a coordination taking place between the machine control system and the X-axis control system after certain time intervals.
BRIEF DESCRIPTION OF THE DRAWINGS Further features and advantages of the inventive machine are set forth in the following description and the appended drawings of several embodiments. The drawings show:
DETAILED DESCRIPTION OF THE INVENTION A first embodiment of an inventive machine for the non-circular machining of pistons comprises, as illustrated in FIGS. 1 to 3, a machine frame designated in its entirety 10 on which a spindle 12 with an essentially horizontal spindle axis 13 is held. A piston 14 is clampable in the spindle 12 for turning. The piston 14 is held opposite the spindle 12 by a rotating clamping sleeve 16 likewise arranged on the machine frame 10 coaxially with the spindle 12. The spindle 12 is preferably driven via a driving belt 18 by a spindle motor 20 seated on the machine frame 10.
The contour 216 according to which the piston 14 is to be machined is illustrated in FIGS. 9 and 10. The contour 216 is divided up into individual discs SB1 to SBn arranged coaxially with the spindle axis 13 and equidistantly in relation to one another. As illustrated in FIG. 10, each disc SB is represented by a series of, for reasons of simplicity, eight support points S1 to S8 shown in the drawing. These each represent the radial spacing of a point 218 on a circumferential surface 222 of the contour 216 from the spindle axis 13. The individual points 218 are arranged at identical angular spacings of 45� relative to one another around the spindle axis 13 as illustrated in FIG. 10. Hence eight support points S1 to S8 belong to each of the discs SB1 to SBn.
Since the activation of the C-axis and the Z-axis is carried out via the machine control system 199 and the X-axis computer 197 is started by the clock generator 212 issuing clock pulses at constant time intervals ΔT and after each start a calculation routine designated K is carried out at a point in time K�ΔT to determine an actuating power U (K), in order to determine the set value W (K), the corresponding C-position value C (K) and the corresponding Z-position value Z (K) have to be determined for the point in time K�(ΔT) and with these position values C (K) and Z (K) the interpolation has to be carried out between those support points S and discs SB which are relevant.
A preferred embodiment of such a calculation routine is illustrated in FIG. 11. According to this Kth calculation routine illustrated in FIG. 11 for the point in time K�(ΔT), the X-axis computer 197 first enters the measured values Ix (K), Ic (K) and Iz (K) from the respective sensors 56, 54 and 30 after it has been started by the clock generator 212.
Furthermore, owing to use of a predictive control, it is ensured that all lag errors of the linear displacement device 40 are taken into account and hence at the respective point in time K�(ΔT) the tool 36 lying in the cutting plane 46 precisely assumes the X-position predetermined by the contour 216.
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