Drawing process control method
AssigneeHerborn & Breitenbach GmbH & Co. KG
InventorsWolf-Dieter Fink, Gustav Matthies
Life of this patent
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Abstract
A process for controlling a multiple stage drawing machine that implements a direct non-sliding drawing process provides for set-up and production to be automatic and for the variables necessary for process control, especially material speed and applied force, to be derived without establishing contact between the stock material and a sensing device.
Claims19
A method for controlling a direct, non-slip wire drawing process, the process including subjecting elongated stock material to the action of a plurality n of serially arranged stationary drawing dies, each die being associated with a separate drawing means, said control method comprising the steps of:
- determining the linear speed of the stock material in the vicinity of each die and generating a rotational speed signal (n.10) commensurate therewith, said speed signals being derived from an operating parameter of an associated means for drawing the stock material through the die;
- determining the force applied to the stock material to pull it through each die and generating a force signal (n.11) commensurate therewith, said force signals being a function of an operating parameter of the associated means for drawing the stock material through each die;
- generating a desired speed signal (n.12) commensurate with the desired stock material linear speed upon exit from the last die;
- generating a desired force signal (n.13) commensurate with the desired force to be applied to the stock material;
- and
- independently controlling the operation of the drawing means as a function of the actual speed signal (n.10) and desired speed signal (n.12) and actual force signal (n.11) and desired force signal (n.13) wherein the operation of the drawing means for the most downstream die which is operating on the stock material is controlled as a function of the actual speed of the stock material exiting that die and the desired speed signal (n.12) and wherein the desired stock material linear speed signal for the next operative die in the upstream direction comprises the desired adjusted system speed signal (n.22) modified by a factor commensurate with any correction in linear speed implemented at the most downstream die and by a factor commensurate with any correction in force implemented at the most downstream die.
A method for controlling a direct, non-slip wire drawing process, the process including subjecting elongated stock material to the action of a plurality n of serially arranged stationary drawing dies, each die being associated with a separate drawing means having a drive, said control method comprising the steps of:
- determining the linear speed of the stock material in the vicinity of each die and generating a rotational speed signal (n.10) commensurate therewith, said speed signals being derived from an operating parameter of an associated means for drawing the stock material through the die;
- determining the force applied to the stock material to pull it through each die and generating a force signal (n.11) commensurate therewith, said force signals being a function of an operating parameter of the associated means for drawing the stock material through each die;
- generating a desired speed signal (n.12) commensurate with the desired stock material linear speed upon exit from the last die;
- generating a desired force signal (n.13) commensurate with the desired force to be applied to the stock material;
- generating a drive speed command signal (n.20) for the drive of each drawing means;
- and
- independently controlling the operation of the drawing means as a function of the actual speed signal (n.10) and desired speed signal (n.12) and actual force signal (n.11) and desired force signal (n.13) wherein the ratios of the value of the desired input speed signal (n.12) and the value of the output drive speed command signal (n.20) for the drive of each drawing means and the desired value of the system adjusted output speed signal (n.22) for a subsequent drive is controlled to achieve an equivalence between the value of the desired force signal (n.13) and the value of the actual force signal (n.11).
A method for controlling a direct, non-slip wire drawing process, the process including subjecting elongated stock material to the action of a plurality n of serially arranged stationary drawing dies, each die being associated with a separate drawing means having a controller and a drive, said control method comprising the steps of:
- determining the linear speed of the stock material in the vicinity of each die and generating a rotational speed signal (n.10) commensurate therewith, said speed signals being derived from an operating parameter of an associated means for drawing the stock material through the die;
- determining the force applied to the stock material to pull it through each die and generating a force signal (n.11) commensurate therewith, said force signals being a function of an operating parameter of the associated means for drawing the stock material through each die;
- generating a desired speed signal (n.12) commensurate with the desired stock material linear speed upon exit from the last die;
- generating a desired force signal (n.13) commensurate with the desired force to be applied to the stock material;
- and
- independently controlling the operation of the drawing means as a function of the actual speed signal (n.10) and desired speed signal (n.12) and actual force signal (n.11) and desired force signal (n.13);
- and
- generating a desired system force signal (O.13) value, which is simultaneously the desired force signal (n.13) value for all the drawing means, from the desired output value of a speed controller, which obtains its desired system speed value (O.22) from a value integrator (11), which serves at the same time as a desired speed signal (n.12) value for the nth controller (4) as a desired speed value signal in cascade, wherein the actual system speed value (O.10) for the speed controller (9) is the actual speed signal (n.10) value of the nth drive (3).
Dependencies are inferred from the claim text.