JP7703447B2 - Correction method and device - Google Patents

Description

The present invention relates to a method for straightening wire or strip material by means of a dressing device, the dressing device comprising offset straightening rollers pressing on both sides of the passing material, some of which are automatically activated according to a probabilistically determined model based on input data of the material and data of the material and the dressing device determined during the material's passage through the dressing device to meet straightness requirements, and the position of at least one straightening roller is continuously corrected and modified based on the data recorded during the material's passage through the dressing device, the data being indicative of a target straightness.

Such a method is described in DE-A-196 53 569. However, this document only deals with very generally measured product and/or process data during the ongoing straightening process, which are incorporated into a model online and changed without specifying the measurements required for this. Furthermore, it is unclear whether or to what extent this model allows inferences to be made from the exact shape of the straightened end product.

The object of the present invention is to provide a closed control circuit for an autonomous method for straightening materials having unknown variable curvatures, which method more reliably guarantees the target straightness of the straightening wire.

This is achieved by the method previously described, which comprises:
(i) the magnitude and direction of the force acting on the straightening roller on the straightening roller itself, and/or
(ii) the temperature of the material before and after passing through the positioned straightening rollers; and/or
(iii) The position of the material after each straightening roller is measured and the measurements obtained are input into a model which controls the adjustment of the adjustable straightening rollers.

Advantageously, (ii) the temperature of the material is measured at the exit of each straightening roller or each straightening block.

Measurement of the forces exerted on the straightening roller (i) is expediently carried out by means of strain gauges arranged on the bearing bolts of the straightening roller and measuring the bending moments in the axial, vertical and/or horizontal directions.

The temperature measurement (ii) records the deformation energy applied to the material being straightened. The material properties fed into the model can be optionally corrected by this measurement. This measurement is only performed at the start of the straightening process or when calibrating the straightening device.

Measurement of the material position (iii) is expediently performed after each straightening roller by measuring the deviation of the material from the passing axis in the positioning direction of the straightening roller. Known optical or non-contact (e.g. magnetic) measuring methods are used. This also applies to the vibrations that arise further for expedient measurement of the passing wire material, the measured values of which are likewise input into the model controlling the adjustment of the adjustable straightening roller. In the current operation, it is only necessary to measure the forces exerted on the straightening rollers to carry out the method according to the invention, and it is conceivable that the position measurement (iii) is performed only at the beginning of the method of the calibration process.

The advantage is that, as mentioned above, the material passes through two dressing devices: one dressing device is a horizontally arranged straightening roller, and the other is a vertically arranged straightening roller.

The invention further relates to an apparatus for carrying out the method according to the invention, comprising a dressing device having two rows of non-driven straightening rollers arranged longitudinally offset from one another, the straightening rollers being pressed against the wire passing between the rows in operation to straighten the wire, some of the straightening rollers being automatically controllable to adjust to the material according to a model so as to meet the straightness requirements of the material leaving the dressing device, the model being determined probabilistically on the basis of input data of the wire and on the basis of data of the dressing device and of the material recorded in the dressing device. Such an apparatus is mentioned in the above-cited DE-A.

The present invention relates to an apparatus in which the straightening rollers that first act on the material have fixed axes in one row, and the straightening rollers that subsequently press the material on the same side as the material are individually adjustable to suit the material passing through, and the straightening rollers in the opposite row are both adjustable to suit the material, among which the straightening rollers in the row that first act on the material are jointly adjustable, and the straightening rollers in the same row that subsequently press on the material are individually adjustable, the magnitude and direction of the force acting on the straightening rollers can be measured by measuring devices such as strain gauges that are autonomously arranged, the temperature of the material can be measured by measuring devices arranged at the inlet and outlet of the dressing device, and all the obtained measurements are provided to a model that controls the adjustment of the adjustable straightening rollers.

In another version of the invention, the temperature of the material after one or several straightening rollers can be measured by measuring devices arranged on each of them, and the measurements obtained can be similarly provided to a model that controls the adjustment of all adjustable straightening rollers.

In another embodiment, the position of the material after one or several straightening rollers can be measured by measuring devices arranged on each of them, and the obtained measurements can be similarly provided to a model that controls the adjustment of all adjustable straightening rollers.

The present application is explained in more detail using drawings.

1 shows a dressing device through which the wire passes. The same dressing device and wire temperature are shown with the measurement points of the forces generated by the individual straightening rollers. 1 shows a straightening roller with strain gauges disposed thereon.

1 and 2 have two rows of horizontal straightening rollers 3, 4, 6, 10 arranged horizontally offset from each other. One row presses on the wire to be straightened from below, the other row presses on the wire to be straightened from above. The material 1 to be straightened may be a strip material (not shown). That is, hereinafter the term material refers to wire or strip material. The straightening rollers 3, 4, 6, 10 do not have a rotation drive. That is, a wire as material 1 passes through the dressing device, which is moved in the direction of the arrow 2 by a feed roller, not shown. Usually, the wire passes successively through two dressing devices, each offset by 90 degrees from each other, one of which has horizontal straightening rollers and the other has vertical straightening rollers. The main operating range of the present invention is a wire diameter between about 4 mm and about 20 mm.

The first two straightening rollers 3 of the lower row shown in Figures 1 and 2 have fixed rotation axes. The lower straightening rollers 4 attached to them are individually adjustable to the passing material 1 by means of an adjustment device 5 as described above. The three first straightening rollers 6 of the upper row are jointly adjustable to the material 1 and for this purpose are mounted on a common support 7, which is height adjustable by means of a servo motor 9 via a lever 8. The upper straightening rollers 10 attached to the two upper straightening rollers 6 are individually adjustable to the material by means of an adjustment device 11 as described above.

2 shows temperature measurements on the material 1 before and after passing through the arrangement of straightening rollers, as well as measurements of the various forces, represented by f, on the individual straightening rollers. Typically, the material 1 heats up during straightening by pressing the straightening rollers. Temperature measuring devices are indicated by points 16. Temperature measurements can also be made at the exit of each straightening roller 3, 4, 6, 10.
Measuring devices for determining the position of the wire, arranged after each straightening roller 3, 4, 6, 10, are not shown in Fig. 2. These are known optical or magnetic measuring devices which measure the deviation of the material 1 from its passing axis parallel to the adjustment direction of the straightening rollers 6, 4, 10, i.e. perpendicular in the illustrated case. Also not shown are measuring devices which measure the vibrations which occur in the wire when straightening the corrugated wire in order to remove the interference variables which arise with it.

All the above measured variables are input into a model that controls the adjustment of the adjustable straightening rollers 6, 4, 10.

Figure 3 shows an enlarged view of the straightening roller 13, in which strain gauges 17 are arranged on the bearing bolt 12 in each groove 15. In order to improve the measurement of the forces acting on the roller and the direction of the forces, up to four strain gauges 17 are provided on the bearing bolt 12 of the straightening roller. In this case, the strain gauges 17 are arranged parallel to one another on the bearing bolt 12. Furthermore, they are arranged around the axis of the bearing bolt 12 at quarter intervals (shifted by 90 degrees). Instead of the strain gauges 17, which have the advantage of simple construction and sufficient measurement accuracy, it is also possible to use other pressure or bending measurement sensors in or on the bearing bolt 12, such as, for example, piezo sensors, which are also simply constructed.

Claims (9)

A method for straightening a wire or strip material by means of a dressing device, the dressing device comprising straightening rollers (3, 4, 6, 10) which press on both sides of a passing material (1) in a shifted manner, some of the straightening rollers (3, 4, 6, 10) being automatically activated according to a probabilistically determined model based on input data of the material (1) and on data of the material (1) and of the dressing device determined by the dressing device during the material's passage through the dressing device so as to meet the straightness requirements, the position of at least one straightening roller being continuously adjusted and modified based on the data recorded during the passage through the dressing device which are input to the model , the data representing a target straightness,
the magnitude and direction of the forces acting on the straightening rollers (3, 4, 6, 10) on the straightening rollers themselves and/or the position of the material (1) behind each straightening roller is measured,
A straightening method , characterized in that the measurements obtained are input as said data into said model which controls the adjustment of adjustable straightening rollers (6, 4, 10). 2. The method of claim 1 ,
the temperature of the material (1) is measured before and after passing through the array of straightening rollers (3, 4, 6, 10) or at the exit of each straightening roller (3, 4, 6, 10) ;
A straightening method , characterized in that the temperature measurements obtained are input as said data into said model controlling the adjustment of adjustable straightening rollers (6, 4, 10) . A method according to claim 1 or claim 2, characterized in that the force acting on the straightening roller (3, 4, 6, 10) is measured by a strain gauge (17) arranged on a bearing bolt (12) of the straightening roller (3, 4, 6, 10), the strain gauge measuring bending moments in the axial, vertical and/or horizontal directions. The method according to any one of claims 1 to 3, characterized in that the measurement of the position of the wire or of the strip material after each straightening roller (3, 4, 6, 10) is a measurement of the deviation of the material (1) from the passing axis, i.e. parallel to the adjustment direction of the straightening rollers (3, 4, 6, 10). 5. A method according to claim 1, characterized in that vibrations induced in the wire or strip material are measured and that the measured vibration values are input as data into the model controlling the adjustment of the adjustable straightening rollers (4, 6, 10). A method according to any one of claims 1 to 5, characterized in that the wire or strip material passes successively through two dressing devices, one of which has horizontally arranged straightening rollers (3, 4, 6, 10) and the other of which has vertically arranged straightening rollers. 7. An apparatus for carrying out the method for straightening wire or strip material according to any one of claims 1 to 6, comprising a dressing device having two rows of non-driven straightening rollers (3, 4, 6, 10) arranged with a longitudinal offset relative to one another, the straightening rollers pressing against a material (1) passing between the rows in operation to straighten said material, a part of the straightening rollers (6, 4, 10) being automatically controllably adjustable to said material (1) according to a model so as to meet the straightness requirements of said material leaving the dressing device, said model being determined probabilistically on the basis of input data of said material (1) and on the basis of data of said dressing device and of said material recorded in said dressing device,
The straightening roller (3) that first acts on the material (1) has a row of fixed axes, and the straightening roller (4) that subsequently engages with the straightening roller (3) on the same side of the material (1) on which the straightening roller (3) acts is individually adjustable, and the straightening rollers (6, 10) in the row opposite the side of the material (1) on which the straightening roller (3) is located are all adjustable to match the material (1), and the straightening rollers (6) included in the row that first acts on the material (1) are jointly adjustable , and the straightening rollers of the material (1) The straightening rollers (10) of the same row which subsequently press against the same side as the side on which the straightening rollers (6) act are individually adjustable, the magnitude and direction of the force acting on the straightening rollers (3, 4, 6, 10) can be measured by these autonomously adjusted measuring devices such as strain gauges (17), the temperature of the material (1) can be measured by measuring devices (16) arranged at the inlet and outlet of the dressing device, and all the obtained measured values are provided as the data to the model which controls the adjustment of the adjustable straightening rollers (6, 4, 10). 8. Straightening device according to claim 7, characterized in that the temperature of the material (1) after one or several straightening rollers (3, 4, 6, 10) can be measured by measuring devices respectively arranged thereon, and the measured values obtained can be provided as said data to a model which controls the adjustment of all adjustable straightening rollers (6, 4, 10). 9. Straightening device according to claim 7 or 8, characterized in that the position of the material (1) behind one or several straightening rollers (3, 4, 6, 10) can be measured by measuring devices respectively arranged thereon, and the measured values obtained can be provided as said data to a model which controls the adjustment of all adjustable straightening rollers (6, 4, 10).

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