Drawing system for generating profiled metal sections, and method for automatically operating such a drawing system

Abstract

A drawing system and a method for automatically operating a drawing system. At least one quality-relevant feature of a drawn product, selected from a group of features including the straightness of the drawn product, the length of the drawn product, the diameter and/or at least a thickness of the drawn product, the roundness of the drawn product, and the surface quality of the drawn product, is measured by at least one quality sensor, and the obtained measurement value is processed in at least one control circuit which acts on at least one quality-relevant manipulated variable of the drawing system or parts of the drawing system via at least one controller. At least one reference variable for at least one quality-relevant feature of a specific drawn product is processed in a process controller.

Claims

1. A drawing system for producing metal profiles, comprising a plurality of control circuits that are configured to act on at least one quality-relevant parameter of the drawing system via at least one controller, at least one process controller that is configured to process at least one reference variable of each control circuit in relation to a specific drawn product in at least one of an intermediate product and an end product and either an adjustable operating point of the drawing system or individual parts of the drawing system, at least one quality sensor that is configured to continuously detect at least one quality feature of the intermediate product or the end product of a drawn product, wherein the at least one quality feature is selected from a group of features respectively corresponding to a group of quality sensors and the at least one quality sensor is selected from the group of quality sensors comprising: a sensor configured to detect the straightness of the drawn product, a sensor configured to detect the diameter and/or at least one thickness of the drawn product, a sensor configured to detect the length of the drawn product, a sensor configured to detect the surface quality of the drawn product, a sensor configured to detect the roundness of the drawn product, and a sensor for checking the chamfered ends of the drawn product.

2. The drawing system according to claim 1, wherein the operating point for the specific intermediate product or the end product can be selected via an operating unit which acts on the at least one controller which automatically sets the operating point of the drawing system for a specific drawn product.

3. The drawing system according to claim 1, wherein the at least one process controller further comprises: at least one memory configured to store the operating point for the specific intermediate product or the end product.

4. The drawing system according to claim 1, wherein each control circuit is configured to act on a different quality-relevant parameter of the drawing system or of parts of the drawing system.

5. The drawing system according to claim 1, wherein the at least one process controller is configured to act on each control circuit.

6. A method for the automatic operation of a drawing system of claim 1, comprising: measuring the at least one quality-relevant feature of a drawn product, processing an obtained measurement value in each control circuit which acts on at least one quality-relevant manipulated variable of the drawing system or parts of the drawing system via at least one controller; processing at least one reference variable for at least one quality-relevant feature of a specific drawn product in the form of an intermediate product and/or end product in the at least one a process controller; and defining the reference variable an operating point of the drawing system or parts of the drawing system on the basis of a specific drawn product.

7. The method according to claim 6, further comprising: storing at least one operating point of the drawing system in a memory of the at least one process controller.

8. The method according to claim 6, wherein a plurality of quality-relevant features of the drawn product are measured, that each measurement value is processed at least in each control circuit.

9. The method according to claim 6, further comprising: defining an operating point of the drawing system or of parts of the drawing system by a plurality of reference variables.

10. The method according to claim 6, wherein at least one measurement value is processed in the plurality of control circuits.

11. The method according to claim 6, wherein a product-specific operating point is defined via the plurality of control circuits of the drawing system.

12. The method according to claim 6, further comprising: optimizing an operating point of the drawing system during operation in relation to a specific drawn product.

13. The method according to claim 6, further comprising: detecting at least one measurement value continuously during the operation of the drawing system.

14. The method according to claim 6, further comprising: processing a single measurement value for a certain quality-relevant feature of a drawn product as a reference variable in each control circuits of respectively successive parts of the drawing system and the plurality of control circuits of the successive parts of the drawing system are linked to one another; and deriving manipulated variables for successive parts of the drawing system from the control deviation.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) The invention is explained below with reference to the accompanying drawings, in which

(2) FIG. 1 shows a schematic illustration of a closed control circuit at a drawing system according to the invention, and

(3) FIG. 2 shows a schematic illustration of the control scheme with several closed control circuits at a drawing system according to the invention.

DETAILED DESCRIPTION

(4) FIG. 1 shows schematically an automatic control at a drawing system 1 according to the invention as a block diagram. The drawing system 1 can be designed, for example, to produce bright steel from a wire produced by a continuous casting process and subsequent rolling. A workpiece 2 as drawn product, for example in the form of a round wire, passes through the drawing system 1 from left to right, with a quality feature of the wire (for example thickness, diameter, roughness, straightness or dimensional accuracy of a chamfered end of the drawn product) being measured with a quality sensor 3 on the output side. The measurement value obtained is fed to a process controller 4. The process controller 4 comprises a memory and evaluation unit as well as at least one controller which, by outputting a corresponding manipulated variable, acts on an actuating means 5 to influence a quality-relevant parameter of the drawing system 1. External information can be entered into the process controller 4 via an operating unit 6. A product-specific operating point of the drawing system 1 can be set via the operating unit.

(5) The block diagram according to FIG. 2 expands the control scheme shown in FIG. 1 to include a plurality of quality sensors 3 and a plurality of actuating means 5 for the drawing system 1 according to the invention. Identical parts are provided with corresponding reference numerals. Otherwise, the block diagram according to FIG. 2 corresponds in principle to that according to FIG. 1.

LIST OF REFERENCE NUMERALS

(6) 1 drawing system 2 workpiece 3 quality sensor 4 process control 5 actuating means 6 operating unit