Method and device for controlling one or mor axes in a machine tool
AssigneeTornos-Bechler SA
InventorsJean C. Simonin, Cedric Paroz
Life of this patent
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Abstract
The control device comprises a computer program. The machining of a workpiece comprises the writing of a program, the essential element of which is a step table. Starting from a predetermined profile of the workpiece, the movements of the X- and Y-axes are plotted in successive steps, and the cumulated intervals of time for obtaining the required movements, as a function of the characteristics of the machine tool and of the workpiece, are stored in the form of a table containing the movements .DELTA.t.sub.xi and the movements .DELTA.t.sub.yi. The reading of the steps, carried out as a function of an appropriate clock signal generator, brings about the successive transmission of the pulses which cause the X- and Y-axes to take their successive steps.
Claims20
A device for controlling one or more axes in a machine tool, comprising:
- an incrementally operating driving means on each of said axes,
- a memory for storing numerical data for all of said axes,
- a clock signal generator, and
- means for attributing to each said driving means a series of movement instructions in the form of increment orders transmitted at intervals of time established by said clock signal generator, said attributing means utilizing numerical data stored from a step table in accordance with a calculation of an optimum machining trajectory as a function of time, wherein said step table comprises for each of said axes a sequence of step orders opposite a series of intervals of time, each of said orders being attributed to one interval of time of said series of intervals of time, thus enabling said attributing means to order said driving means attributed to the respective one of said axes to effect a variable whole number of steps, said whole number being zero, one, or a whole number greater than one.
A method of controlling programmed movements effected by one or more incrementally operating driving means actuating one or more moving parts of a machine tool carrying out a machining operation on a rough workplace fixed to a workpiece holder of said machine tool, comprising the steps of:
- calculating an optimum machining trajectory as a function of time,
- establishing a step table in accordance with said calculating step, said table permitting a given profile to be obtained with a given material, taking into account characteristics of the machine tool, and
- attributing to each driving means, by using numerical data stored from the step table, a series of incremental movement orders succeeding one another as a function of a time-dependent variable, the sequence of the orders being included in the step table, wherein the numerical data of the step table indicate for each movement a variable number of increments or steps to be carried out during a fixed number of units of time.
Dependencies are inferred from the claim text.