Control system for crankshaft milling and grinding machines
AssigneeGFM Gesellschaft fuer Fertigungstechnik und Maschinenbau Aktiengesellschaft
InventorKurt Maecker
Life of this patent
Estimating the term…
Abstract
A control system for a crankshaft-milling or grinding machine having a milling carriage movable in a plane perpendicular to the longitudinal axis of the crankshaft to be machined. A pulse-generating rotary transducer coupled to the workpiece spindle supplies pulses to a computer to indicate both rotary speed and angular position, the computer issuing the requisite control data. The computer is fed pictorial or construction-point data concerning crank pins and crank webs of arbitrary configuration, the computer issuing the requisite control data for feed speed and position after it itself has calculated such data, the data being issued with a clocking rate and updated at such clocking rate at a frequency corresponding to the required degree of dimensional accuracy.
Claims6
Electric numerical program control for crankshaft milling machines and crankshaft grinding machines with the following characteristics:
- (a) a milling slide which is movable in a plane at right angles to the axis of the crankshaft,
- (b) a workpiece spindle which can be rotated and is connected to a rotary digital transducer in a stationary manner which transmits pulses in relation to the rotary movement,
- (c) a computer associated with the milling slide in which predetermined, selectable operating programs are stored for crank pins, oval/rectangular webs and mixed forms of the latter,
- (d) means for entering and storing in the computer drawing and/or design data for pins and webs and their mixed forms as well as the cutter radius R.sub.F and a uniform angle calculation increment for the rotation of the workpiece,
- (e) means for inputting into the computer the pulses generated by the rotary digital transducer mounted on the workpiece spindle,
- (f) means incorporated in the computer for calculating and storing the position values x.sub.n required for the milling slide from the predetermined, the entered and the input values for the purpose of machining crank pins according to the known formula for crank assemblies, for curved and straight circumferential profiles from form radii Ru and their angular positions calculated in the computer, means for output for these values for the purpose of calculating a sign digit adapted to the angular increment and means for storage of these sign digits,
- (g) multipliers incorporated in the computer for multiplying the sign digits by the number of pulses received in the predetermined time increments ta during the process, whereby the feed rate for the next angular increment is determined, which is converted into the guide voltage for the milling slide.
Dependencies are inferred from the claim text.