Measurement unit and method for measuring straightened wire-shaped or pipe-shaped materials

Abstract

The measuring unit (350) for measuring the residual curvature of the straightened wire-shaped or pipe-shaped workpiece that has passed through a straightening system having two tandemly connected adjustable roller straighteners (400-1, 400-2) with differently oriented straightening planes accommodates the rod-shaped sections (110-A) of the workpiece that has passed through the straightening system, separated from the workpiece, at a measuring position, and has a measuring device (520) for determining measurement data representative of the residual curvature of the straightened workpiece. The measuring unit is configured for straightening-plane-specific measurement, which allows the curvature components represented by the measurement data to be associated with the different straightening planes of the roller straighteners.

Description

Technical Field

[0001] The present invention relates to a measuring unit and a measuring method for measuring a residual curvature in a corrected wire shape or pipe shape workpiece that passes through a correction system having two longitudinally connected roller correction machines having correction planes in different orientations.

Background Art

[0002] Wires, pipes, and other elongated semi-finished product materials often exist in the form of wound-up material stocks (coils) immediately after production and usually have to have their winding bends corrected before further processing. Correction is a manufacturing process belonging to the group of forming processes and is used here to make the elongated material, also referred to here as the workpiece to be corrected, as straight as possible, i.e., with little or no residual curvature, before further processing. For this purpose, in the correction process, the material is transferred from the material stock through the correction system, which produces a corrected material or a corrected workpiece to be corrected by applying deformation to the material by means of a correction operation.

[0003] The type of correction system considered in the present application has at least two roller correction machines. A roller correction machine has a number of passive, i.e., not rotationally driven, correction rollers having axes of rotation parallel to one another, and these correction rollers are alternately arranged on both sides of the passage section in the passage direction and define the correction geometry arrangement by the circumferential sections that contact the workpiece during drive. Since it is possible to change the one-dimensional input curvature (the curvature before entering the roller correction machine) of the workpiece to be corrected within one plane using a roller correction machine, there is a defined residual curvature within this plane after the correction process. Generally, a final product without residual curvature, i.e., a straight final product, is desired. Generally, a correction system having two longitudinally connected roller correction machines is used, whereby the input curvatures in two mutually perpendicular planes are removed.

[0004] A straightening system with rollers does not rotate, and in this respect, it differs in principle from a rotating straightening system with so-called straightening vanes that exert straightening force in many different planes.

[0005] In an adjustable roller straightening machine, at least one of the straightening rollers can be delivered in a feed direction perpendicular to the direction of passage. This allows for variations in the straightening geometry of the roller straightening machine, resulting in better straightening results. Depending on the type of roller straightening machine, the straightening rollers can be delivered manually, semi-automatically, or automatically in response to control signals from a control unit using corresponding actuators (e.g., servo motors, pneumatic cylinders, hydraulic cylinders, etc.).

[0006] Poor straightening results may occur, for example, when a new material to be straightened is started after coil replacement or switching to another process. Even during the process, material inhomogeneity, changes in material properties, and / or wear of the straightening rollers can lead to poor straightening results. Raw materials are also affected by manufacturing tolerances. Changes can be detected by periodic inspections using sampled materials. If an unacceptable deterioration in straightening quality occurs, the straightening system must be better adjusted by changing the straightening geometry arrangement.

[0007] In reality, machine operators require considerable experience and skill to ensure consistent orthodontic quality with the machines they operate. Numerous studies already exist to achieve manufacturing processes that produce highly reproducible orthodontic quality regardless of the machine operator's capabilities.

[0008] Patent Document 1 (German Patent No. 19503850(C1)) describes a non-rotating straightening machine for a bending machine having a built-in measuring device. The straightening machine has at least one non-rotating straightening device that operates in at least one straightening plane for wire material or band material. The straightening device has a plurality of mutually continuous straightening rollers for processing the material, which are adjustable by at least one actuator in the straightening plane and laterally with respect to the axis of passage of the material. A material bending measuring device is provided behind the straightening device in the direction of passage of the material, and a measuring section is provided therein for a material section of a predetermined length, and at least one mechanical and / or electronic and / or optical scanning device is arranged along the measuring section to determine the degree and direction of bending, and the scanning device is capable of generating a signal representing the measured bending of the material section, and the actuator of at least one straightening roller is an actuator that performs a corrective operation movement in response to the signal. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] German Patent No. 19503850 (C1) [Overview of the project] [Problems that the invention aims to solve]

[0010] The object of the present invention is to provide a measuring unit and a measuring method for measuring a straightened wire-shaped or pipe-shaped material, which enables accurate measurement of the residual curvature of the straightened material and provides meaningful measurement results, which can be used in the adjustment and driving of the straightening system to quickly and systematically optimize the straightening geometry arrangement of the roller straightening machine, thereby obtaining good straightening results. [Means for solving the problem]

[0011] This problem is solved by a measuring unit having the features of claim 1 and a measuring system having the features of claim 11, in accordance with the expression of the present invention. The language of all claims is provided by reference to the content of this specification.

[0012] The measuring unit and measuring method are suitable for measuring the residual curvature of a straightened wire or pipe-shaped material that has passed through a straightening system having (at least) two sequentially connected roller straightening machines with straightening planes of different orientations. Preferably, the straightening planes are oriented perpendicular to each other, in particular one of the straightening planes being horizontal and the other perpendicular.

[0013] Measurements are performed on rod-shaped sections (rods) of predetermined length (rod length) that have been separated from the orthodontic material by a cutting device after it has passed through the orthodontic system. Each individual rod is measured.

[0014] The measuring unit houses rod-shaped sections at each measurement position and has a measuring device for obtaining measurement data representing the residual curvature of the straightened material.

[0015] The unique feature lies in the fact that the measurement unit is configured for measurement specific to the orthodontic plane, which enables at least a nearly unique correspondence between the measurement data or the curvature component represented by the measurement data for different orthodontic planes of the roller straightening device.

[0016] This invention is based in particular on the following considerations:

[0017] A roller straightening machine performs straightening only within a single straightening plane. When a straightening system comprises two roller straightening machines that pass through consecutively, each having different straightening planes, particularly straightening planes oriented perpendicular to each other, the curvature in the two straightening planes can be determined independently of each other by a first approximation. It is known that it is important to be able to uniquely associate the measurement results obtained in the straightened material with individual straightening planes for the purpose of adjusting or delivering the straightening rollers in the adjustment process, or within the framework of closed-loop control during operation. Measurement methods and devices that enable this are referred to in this application as "straightening plane-specific measurement" or "straightening plane-selective measurement".

[0018] It is known to measure the linearity or residual curvature of a straightened section of material that is still connected to adjacent sections of the material being straightened. In some cases, the measurement can be taken as the material is moving forward. Alternatively, the material can be briefly stopped for measurement (see German Patent No. 19503850(C1)). The inventors consider it a drawback that in this case, stresses and forces acting from other sections of the material being straightened strongly affect the shape of the section being measured, which may prevent the true curvature from being measured.

[0019] According to the invention described in the claims, the measurement is performed on a rod-shaped section or rod of a predetermined length that has been separated from the material to be straightened by a cutting device after passing through the straightening system. Since the material to be straightened on the rod is separated from the rest of the rod and can be relaxed without external force, the shape of the rod represents the true curvature with at least near-no distortion. In the inventor's knowledge, if a relatively short section is separated from the straightened material and this rod is subsequently measured or its linearity is tested, better interpretable measurement results can be obtained.

[0020] This allows for a relatively easy-to-implement and evaluate measurement method to obtain an accurate quantitative explanation of the curvature component, and this curvature component can be uniquely associated with different orthodontic planes during evaluation.

[0021] The preferred rod length is usually much shorter than 1 meter, and depending on the stiffness of the straightened material, it is, for example, between 300 mm and 700 mm.

[0022] Other advantages of this configuration can be considered as follows: Many conventional linearity measurement systems are designed to allow a comprehensive description of the curvature of a straightened material in order to distinguish, for example, a well-straightened material with the desired straightening quality from a material with insufficient straightening quality. In contrast, the measurement unit or measurement method of the claimed invention can not only determine a rough value of the residual curvature, but can also divide the information on the residual curvature of the rod-shaped section obtained from the measurement into curvature components and uniquely associate them with the individual straightening planes of the straightening system. This type of straightening plane-specific, or straightening plane-selective measurement, makes it possible to quantitatively detect which components of the determined residual curvature were produced by at least one of the two straightening machines.

[0023] This information regarding the residual curvature of the material to be straightened, classified according to the straightening plane, allows for subsequent adjustments to the roller straightening machine, for example, within the framework of adjusting the straightening system, thereby enabling proper adjustment of the straightening rollers with fewer experiments. For example, if the straightening system has a first roller straightening machine with a first straightening plane oriented vertically and a second roller straightening machine connected thereafter with a horizontal straightening plane, the measurement data can be used to separate and quantify the horizontal and vertical components of the residual curvature. Therefore, in the adjustment process, for example, if the confirmed residual curvature occurs mainly or exclusively in one of the straightening planes, the adjustment of the straightening rollers can be concentrated on the straightening machine whose straightening plane is affected by the excessive residual curvature. As already mentioned above, a significant contribution to obtaining meaningful measurement results can be made by performing measurements on rods separated to appropriate finite lengths. Since the material to be straightened to be measured, i.e., the separated rods, are separated from the rest of the subsequent part, they can be relaxed without external force, so that the shape of the rods represents the true curvature situation with at least almost no distortion. To enable such measurements on a relaxed rod, some embodiments include a device for fixing a straightened rod-shaped material to a first fixing point and a second fixing point spaced apart from the first fixing point, configured and arranged such that only the vertical and horizontal positions of the rod-shaped material are predetermined for each fixing point, so that no forces other than gravity act on the section of the rod-shaped material located between the fixing points. Furthermore, there is a device for measuring the position of the material to be straightened in a measuring plane located between the first and second fixing points, and a device for determining the residual curvature using positional data of the first and second fixing points and the position of the material to be straightened in the measuring plane.

[0024] The type of almost force-free position fixation proposed here gives the rod accommodated at the fixation point a certain degree of freedom to orient itself in space, so that the rod can relax and form a curvature. This is regarded as an important difference with respect to a solution where the wire to be measured is measured within the region between two wire guides, and those measurement guides closely surround all sides of the wire and prevent any occurring oblique orientation.

[0025] The measuring unit can handle wires separated by a cutting device belonging to other machines connected upstream in the process, such as a correction and separation machine whose end product is a corrected rod. In these cases, a dedicated cutting unit for the measuring unit is not necessary.

[0026] According to a further development example, the measuring unit has a cutting device for separating a rod-shaped section of a predetermined length from the corrected material that has passed through the correction system. The measuring device is connected downstream of the cutting device in the material flow direction. By having the cutting device integrated, the measuring unit can, as a self-sufficient unit, separate a rod-shaped section of appropriate length from the corrected endless material and perform a straightness inspection or measurement of the residual curvature in this section.

[0027] The cutting device can be attached to or on a common frame of the measuring unit together with the measuring device in order to form a functional unit that guarantees a fixed positional relationship and can be used, for example, as an adjustment station. An example of this type of self-sufficient measuring unit will be explained in detail below.

[0028] To achieve plane-specific or plane-selective measurements, the measuring unit is preferably configured so that the material being straightened is measured at a rotational position after passing through the straightening system. In this case, the concept of "rotational position" refers to the rotational position or direction of rotation with respect to the self-rotation of the material being straightened around its longitudinal axis. Plane-specific measurement data can also be obtained by mechanically detecting rotation that may occur between separation and measurement, and by correcting the measurement data obtained by the measuring device with respect to the direction of rotation. However, it is considered much simpler and more accurate to eliminate this type of self-rotation by methodological and structural measures.

[0029] For measurement, a rod of appropriate length is separated from the rest of the material to be straightened, so self-rotation of the rod around its longitudinal axis should be avoided between the act of separation and the act of measurement, thereby enabling a unique correspondence of the measurement results to the corresponding roller straightening machine. This can be particularly problematic when processing round materials, for example, if they are placed so as to roll along an inclined surface between separation and measurement. When processing materials with an uneven cross-section, such as a rectangular cross-section, simple measures such as placing the material to be straightened on a straight or flat surface are sufficient to prevent self-rotation.

[0030] In a further development, the measuring unit features a rotational prevention device, which is configured such that the rotational position of the rod-shaped section provided for measurement does not change about its longitudinal axis between straightening and measurement, and that measurement is possible at the rotational position where the material to be straightened has passed through the straightening system. Thus, the rotational prevention device and / or rotational prevention measures ensure that the rotational position of the material about its longitudinal axis does not change between straightening and measurement.

[0031] In a further development, the measuring unit has a control unit, which in the drive mode is configured such that the cutting device and the measuring device are driven in coordination and moved to the measuring position in the measuring device by a controlled feed, the front end section of the straightened material to be straightened is prevented from self-rotation by a rotation prevention device of the measuring device, for example by clamping, and only then is the cutting device driven so that the rod-shaped section to be measured, which has been prevented from rotating, is separated from the rest of the material to be straightened. The separated material to be straightened is kept stationary by clamping the material to be straightened before separation, or by other rotation prevention fixing means.

[0032] The harmony between cutting and measurement is particularly easily achieved when the cutting device is integrated into the measuring unit. However, even when the cutting device is external, and therefore belongs to another unit rather than being a component of the measuring unit, control technical adjustments are still possible.

[0033] In many variations, the material to be straightened is first transported into the area of ​​the measuring device, where it is housed and prevented from rotating, and only then is it separated from the rest of the material to be straightened. In embodiments of the measuring device, prevention of rotation can be ensured by a laterally slidable member of the clamping device.

[0034] Furthermore, it is also possible to provide a rod transfer device, which grips the section of the material to be straightened to be separated before the cutting operation is performed, transfers it to the measuring device after it has been separated from the rest of the material, inserts or places it in a rotational position that does not change, and releases it after the rod-shaped section has been housed in the measuring device in a way that prevents it from rotating.

[0035] As already mentioned above, the measuring unit can be configured to measure at the rotational position where the material being straightened has passed through the straightening system. However, this is not always necessary, and the rotational position of the rod section at the time of measurement may differ from the rotational position of the rod section when it separates from the rest of the material. Generally, it is sufficient that the rod section is housed within the measuring unit so that it can be measured within a defined rotational position that has a known spatial relationship to the rotational position where the material being straightened has passed through the straightening system. In this case, measurements specific to the straightening plane can be performed, because the measurement results can be associated with individual straightening planes.

[0036] Many embodiments of the measurement method utilize this possibility because rotational position markings are formed on the rod-shaped section, which are suitable for confirming the rotational position of the rod-shaped section as it existed during orthodontics. The rod-shaped section with rotational position markings is then transported to a measurement unit and positioned at a predetermined rotational position in the measurement unit. This rotational position is in a known spatial relationship with the rotational position of the material being orthodontized as it passed through the orthodontic system, and is therefore convertible or coordinate-transformable. To ensure that this predetermined rotational position can be systematically and reliably adjusted, a rotational position adjustment assist device is used on the measurement unit side, which is configured to functionally cooperate with the rotational position markings on the rod-shaped section to ensure that the rod-shaped section is positioned at the predetermined rotational position for measurement. The measurement results obtained in this way can then be uniquely mapped to the orthodontic plane.

[0037] Various possibilities exist for generating rotational position markings. In many embodiments, a bent or curved section is formed at or near the end of a rod-shaped section, and it is angled so as to be radial to the longitudinal axis of the rod-shaped section in a given direction, thereby enabling the precise determination and, in some cases, reproduction of the rotational position. The length of the curved section compared to the rest of the rod-shaped section is usually very short, for example, up to 20% or up to 10% of the total length of the rod-shaped section. In the spirit of this application, a rod or “rod-shaped section” does not exist only when it extends substantially straight over its entire length. Rather, a rod or rod-shaped section exists even when it extends linearly over the overwhelming portion of its total length, for example, over at least 80% or at least 90% of its total length.

[0038] To generate rotational position markings, notches or other partially recessed structures can be formed in the material of the section, for example, using a punch, center punch, knurling tool, or texture-marking tool. Cutting tools can also be used for marking by guiding the working stroke slightly so that the blade penetrates a little into the material to form a notch. If the material is an insulated wire, rotational position markings can also be provided by partially or completely removing the insulating layer at a small area on the circumferential surface of the insulating layer, so that the rotational position can be recognized using the removed insulation. In principle, each marking can be used such that the marked area does not have rotational symmetry with respect to the longitudinal axis of the rod-shaped section. For example, the cutting device can be designed such that, by a cutting operation to separate the rod-shaped section, a characteristic shape change used as a rotational position marking is formed at the end of the rod-shaped section, for example, by forming a chamfer on one side. If chamfers are to be provided on multiple sides, the chamfers can be distinguished so that a chamfer that is reliably distinguishable from the other side can be used as a rotational position marking.

[0039] Rotational position markings can also be provided by a laser beam, by providing color markings, or preferably by adhering self-adhesive stickers to the sides of the rod-shaped section. Unlike the above-mentioned possibilities of changing the shape of the rod-shaped section by applying mechanical action to the ends, laser marking (laser marking), color marking, or adhesion is one possibility of marking the rod-shaped section without mechanical load on it.

[0040] As a rotational position marking, a separately formed, preferably shape-adapted, asymmetrical marking member can also be used, which can be fixed to the free end of the rod before it is separated from the rest of the rod by means of, for example, attachment, clipping, clamping, or adhesive. For example, a clip or small cap formed using 3D printing can be attached to, placed over, or clipped onto the free end of the rod before it is separated. In this case, the asymmetrical nature makes it easy to recognize the rotational position.

[0041] A rotational position adjustment assist device can be provided on the side of the measuring unit. This device can be adapted to the type of rotational position marking and functionally cooperate with the rotational position marking to ensure that the rod-shaped section is positioned at a predetermined rotational position to be directed for measurement. In simple cases, the measuring unit itself can be equipped with markings or other orientation assist devices so that a machine operator or robot can optically detect at which rotational position the rod-shaped section must be mounted in order to enable directed measurement. It is also possible for the rotational position recognition device to have a camera for optically detecting the rotational position marking. In that case, the camera signal can be used to position the rod-shaped section within the measuring unit to take the predetermined rotational position to be directed. This correct positioning and orientation can be performed by the operator, semi-automatically, or automatically.

[0042] Another possibility is to provide a rotational position recognition assisting device, which has a mechanical marking counter member for mechanically contacting a rotational position marking on a rod-shaped section. This marking counter member can adjust the desired rotational position of the rod-shaped section by having, for example, a section with a counter structure complementary to the rotational position marking, thereby forming contact itself. A counter member corresponding to the rotational position marking on the rod-shaped section can be provided. For example, a locking member can be provided that fits into a notch or center punch used as a rotational position marking, provided at one location on the circumferential surface of the rod-shaped section. In order to obtain a defined rotational position, a bent or curved section may have to be inserted into a corresponding cutout at the end of the rod-shaped section, or a marking (e.g., a chamfer) formed by a cutting operation may have to be attached to the appropriate oblique surface.

[0043] Using the measures described above, rods straightened regularly or irregularly during the manufacturing process, according to predetermined diagrams or with respect to the machine, can be supplied to a measuring device where they are measured, thereby determining the straightening quality, and in some cases, by making changes to compensate for adjustments to the straightening system, in some cases, intra-process measurement / closed-loop control can be performed. Rods removed from the material flow for inspection purposes can be supplied back to subsequent manufacturing steps if possible, but this is not mandatory. Therefore, sometimes straightened rods can be separated from the material flow for measurement purposes and, in some cases, returned to the material flow after the measurement is completed.

[0044] In a further development, the straightened material is fixed for measurement purposes at a first fixing point and a second fixing point located at a distance from the first fixing point, as follows: the vertical and lateral positions of the material (for example, the horizontal direction perpendicular to the longitudinal axis of the rod) are determined for each fixing point, and the section of the material to be straightened located between the fixing points is fixed in such a way that no forces other than gravity act on it. Subsequently, the position of the material to be straightened is measured in a measurement plane located between the first and second fixing points. This can be, for example, located in the center of the fixing points. In this case, the residual curvature of the wire section located between the fixing points is determined using positional data for the position of the material to be straightened at the first fixing point, the second fixing point, and the measurement plane.

[0045] Structurally, the measuring device can be provided with first and second clamping devices, which provide a mounting portion for the material to be straightened at appropriate fixed locations and have clamping members that can move laterally to contact the material to be straightened, thereby determining its lateral position. In any case, the clamping members exert only a small force when they contact the material to be straightened.

[0046] In a further development, the measuring device has a first clamping device on the side facing or to face the cutting device (entrance side), and a second clamping device at a longitudinal distance from it, in which case the components of the measuring system are arranged in the area between the clamping devices, and the measuring system is designed to define a measuring plane oriented laterally, and particularly perpendicularly, to the longitudinal direction of the measuring device, and to define the position of the rod-shaped section placed within the measuring plane. The measuring plane is preferably located in the center between the clamping devices, where the quantitatively largest displacement of the fixed rod-shaped section is typically expected, which contributes to the measurement accuracy.

[0047] In a further development, each clamping device has a mounting roller mounted on a horizontal axis of rotation and two lateral positioning members that are displaceable by a drive, and the inserted rod-shaped sections can be fixed to fixed locations defined vertically and horizontally, respectively. In this case, the section located on the jacket surface of the mounting roller can define the vertical position, and the laterally positioned lateral positioning members can define the horizontal position. The lateral positioning members can be formed, for example, as rotatably supported lateral positioning rollers. However, rotation is often unnecessary. Laterally positioning members that are fixedly mounted, such as lateral positioning blocks, can also be provided, which may have a convexly curved front surface to provide a point- or linear contact surface with the material being straightened.

[0048] In this type of embodiment of the measuring device, rotation prevention is ensured by lateral positioning members, such as lateral positioning rollers or lateral positioning blocks, that are laterally slidable within the clamping device and thus function as rotation prevention devices. When a rod-shaped section is softly clamped laterally, for example, by a lateral positioning member on a vertical axis of rotation, or by a lateral positioning block on a cylindrical front surface, the degree of freedom of rotation about the longitudinal axis of the rod is substantially eliminated, and the horizontal clamping between the substantially point-like contact points between the mounting roller and the outside of the rod-shaped section does not essentially hinder any resulting sag or vertical displacement of the rod. Thus, the true curvature of a rod-shaped section, supported at two points spaced apart from each other and otherwise subjected only substantially by gravity, can be measured. Instead of roller-shaped lateral positioning members, other, possibly immovably supported lateral positioning members, such as blocks with convexly curved contact surfaces, can also be provided. Preferably, the contact surface with the workpiece must be formed such that only substantially point-like or small-area contact points are generated, so that the straightened rod is sandwiched between substantially point-like contact points only in the horizontal direction, and any resulting vertical sag is not essentially prevented.

[0049] Therefore, the anti-rotation mechanism can be a member with an appropriate geometric arrangement that allows point- or linear contact between the clamping device and the rod-shaped section. This includes, for example, the roller mentioned, but also a non-rotatable member having a pointed or rounded end within the contact area, and thus a contact surface that is curved, for example, cylindrical or spherical.

[0050] Further developments show that the spacing between clamping devices measured parallel to the longitudinal direction is infinitely adjustable, so the measuring device can easily be adapted to rod-shaped sections of various lengths. The rod-shaped sections provided for measurement are often much shorter than 1 meter, and their length depends on the stiffness of the straightened material, for example, between 300 mm and 700 mm, and in some cases (for relatively thin rod materials) even less.

[0051] One of the clamping devices may be fixedly mounted while the other is slidable, but preferably the clamping device is mounted on a carriage, the carriage travels on a guide rail, the guide rail is fixed to the upper side of a horizontally oriented base plate of the measuring system. Thus the two clamping devices can slide steplessly within the same axis and then be fixed in the desired position.

[0052] To ensure that the measuring plane can be properly positioned for rods of different lengths, a further development involves fixing the components of the measuring device to a support, which is mounted on a carriage, which is movable on a guide rail, which also guides the clamping device. Thus, an extremely stable arrangement is formed that can easily accommodate various dimensions of the rod-shaped section to be measured.

[0053] For the measurement and recording of the material being straightened after passing through the straightening system, any measuring device can be used that, in principle, provides a quantitative description of the residual curvature within the straightening plane of the roller straightening machine and enables a unique correspondence between the measured residual curvature and the straightening plane.

[0054] The measured quantity does not need to directly correspond to the residual curvature; it is sufficient if the measured quantity is a value that represents the residual curvature. The measurement can be performed tactilely (and therefore by contact) or non-contact, for example, using optical and / or electromagnetic devices. What is important in this case is that the measurement technique allows for a description of the residual curvature or the orthodontic quality in the orthodontic plane on which each orthodontic machine operates, in order to adjust the orthodontic machine.

[0055] Further developments include a measuring device with an optical measuring system that uses laser radiation to generate two perpendicular laser beam curtains positioned within the measuring plane. These are detected using opposing photosensitive sensors, thereby allowing the position of the material to be corrected within the measuring plane to be determined with high precision in two directions by projection. Non-contact measurement does not affect the shape of the rod to be measured.

[0056] The residual curvature, which is affected by each roller straightening machine and exists within the curved plane (a plane perpendicular to the rotation axis of the straightening roller), can be easily determined from the distance between the measured position of the rod section and a reference position located within the measurement plane, where the reference position exists when the straightened material has the target residual curvature. This reference position is preferably not on a straight line connecting two fixed points, but rather takes into account the sag of the straightened material, which is based on gravity and rests on the fixed points. To determine the position of this reference point, the straightened material parameters used for sensitivity analysis can be similarly used, possibly modified to account for situations where the straightened material is deformed several times during the straightening process, thereby potentially changing its elastic properties.

[0057] The present invention also relates to a method for adjusting a straightening system that removes kinks from a wire-shaped or pipe-shaped material being straightened, wherein a measuring device and measuring method according to the invention described in the claims are used.

[0058] Other advantages and aspects of the present invention will be apparent from the claims and from the following description of embodiments of the present invention, which will be illustrated with reference to the figures below. [Brief explanation of the drawing]

[0059] [Figure 1] Figure 1 shows the components of a feeding device for supplying wire material from a wire coil to a deformation machine (not shown), the feeding device being located in an adjustment station with an integrated linearity measuring system. [Figure 2] Figure 2 shows a magnified view of the straightening system of the supply device shown in Figure 1. [Figure 3] Figure 3 shows a magnified view of the measuring device at the adjustment station shown in Figure 1. [Figure 3A] Figure 3A shows the measurement plane in detail. [Figure 4A] Figure 4A shows a modified method in which the self-rotation of the separated and straightened round bar is prevented by a rotation prevention device while it is separated from the rest of the wire for measurement. [Figure 4B] Figure 4B shows a modified method in which the self-rotation of the separated and straightened round bar is prevented by a rotation prevention device while it is separated from the rest of the wire for measurement. [Figure 4C] Figure 4C shows a modified method in which the self-rotation of the separated and straightened round bar is prevented by a rotation prevention device while it is separated from the rest of the wire for measurement. [Figure 5A] Figure 5A shows a modified method in which the straightened rod is separated from the flat material and measured. [Figure 5B] Figure 5B shows a modified method in which the straightened rod is separated from the flat material and measured. [Figure 5C] Figure 5C shows a modified method in which the straightened rod is separated from the flat material and measured. [Figure 5D] Figure 5D shows a modified method in which the straightened rod is separated from the flat material and measured. [Figure 6A] Figure 6A shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 6B] Figure 6B shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 6C] Figure 6C shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 6D] Figure 6D shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 6E] Figure 6E shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 7A] Figure 7A shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 7B] Figure 7B shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 7C] Figure 7C shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 8A] Figure 8A shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 8B] Figure 8B shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 9]Figure 9 shows an embodiment in which a device for generating rotational position markings is located on the supply unit side, and a rotational position adjustment assist device is located on the measurement unit side. [Figure 10] Figure 10 shows another embodiment of a measuring device for measuring the residual curvature in a straightened and separated rod. [Modes for carrying out the invention]

[0060] The following describes an example of a measuring unit and method for measuring the residual curvature of a straightened wire or pipe-shaped material. The material passes through a straightening system having two sequentially connected roller straightening machines with straightening planes oriented perpendicular to each other. The material, such as a wire, can be further processed in a deformation machine to form a straight or curved molded part from the material. The measuring unit and method can be used, for example, when adjusting the straightening system.

[0061] Figure 1 shows the components of a wire processing machine, which is designed and tuned to process elongated workpieces 110 in the shape of metal wire, which are supplied as workpiece stocks in the shape of so-called coils, and thus bundles of wire wound in the form of reels. From workpiece material that initially exists in large lengths on the workpiece stock, a certain number of homogeneous or heterogeneous molded parts are formed by deformation in a computer numerically controlled manufacturing process. The molded parts can be, for example, coil springs, particularly compression springs or tension springs, or bent parts in other geometric arrangements. The molded parts can generally be bent in two or three dimensions, and in some cases can also exist in the shape of straight rods (for example, in straightening machines or rod mass production machines). The Cartesian xyz machine coordinate system is used to better describe the direction and positional relationships.

[0062] When ready for operation, the wire processing equipment includes a deformation machine (not shown), which can be designed, for example, as a spring winding machine when forming a coil spring.

[0063] Furthermore, a device 300 is provided for supplying elongated wire-shaped workpiece material to a deformation machine. This device 300 is also referred to in this application as a supply device 300. The supply device is a deformation machine, which deforms a wire straightened by deformation from a wire stock that is somewhat strongly curved. Figure 1 shows some components of the supply device 300 in the adjustment area or adjustment station 350.

[0064] The challenge for the supply device 300 is to supply a straightened wire (with residual curvature nearly zero within the tolerance range) to the deformation machine or its retraction device connected to the downstream stage, as accurately as possible at the required speed at each point in time. The supply device 300 has a dedicated control unit 390, which communicates with the control unit of the deformation machine. The functionality of the two control units can be integrated into a single control unit.

[0065] After adjustments are completed at the adjustment location, the supply device is moved to its working position in the deformation machine to which it is to supply. For this purpose, the illustrated components are mounted on a movable platform, which can be supported such that it is linearly slidable on guide rails, or rotatable about a vertical axis of rotation, or it can be moved without guidance (for example, on rollers or wheels).

[0066] The supply device has a supply unit 310, which has a storage device 330 for housing a coil-shaped workpiece stock 381 and a straightening system 400 connected downstream for removing shape from the workpiece before it enters the deformation machine. Details of the straightening system 400 are shown in Figure 2.

[0067] Figure 1 shows a supply unit 310 in the adjustment station 350, which enables the machine operator to perform all operations on the straightening system 400 located in the adjustment station 350, adjusting the straightening system to match the workpiece material being used, and is necessary to supply straightened workpiece material with high straightening quality, particularly material with no residual curvature or only slight residual curvature within the tolerance range, when the supply unit is in the manufacturing drive and therefore in its working position in the deformation machine.

[0068] The workpiece stock (coil) is pre-held on a replaceable reel 335, which is housed in a housing device 330 and supported so as to be rotatable around a horizontal axis of rotation in its housed state. In this case, the support is not performed within the region of the reel's axis of rotation, but instead two axis-parallel support rollers 332, 333 are mounted in the floor region, having a horizontal axis of rotation. These support rollers are components of the housing device 330. Since the reel rests on the two support rollers, the circumference of the disc-shaped side members of the reel rests on the two support rollers, and the position of the axis of rotation in space is defined. In this example, the reel is an active reel with a dedicated drive. The drive 334 engages with the front support roller 333 and can be driven under the control of a control unit 390.

[0069] The pulled-out wire is guided through a direction changer 340, which has an upper direction changer roller 340-1 and a lower direction changer roller 340-2, which are supported on a vertical support 341 so as to be rotatable parallel to the axis. The upper direction changer roller is formed as an active dancer roller with spring return. By querying the position of this roller, a drive motor for the support / drive roller is controlled in a closed loop. The lower direction changer roller is wound, for example, over three-quarters of its circumference, so that the exit, and therefore the upper side of the lower direction changer roller 340, is at the height of the passage opening on the inlet side of the straightening system 400.

[0070] Therefore, the wire is guided substantially horizontally into the straightening system 400 by a downward direction-changing roller. Between the direction-changing device and the straightening system is a wire guide device 375, whose exit is aligned with the inlet of the straightening system 400, which is connected downstream. A wire end recognition device can be integrated into the wire guide device.

[0071] An alternative structure is shown or suggested by dashed lines in Figure 1. In this structure, the lower direction-changing roller is omitted. This structure has a buffer storage container 600 in the shape of a relatively flat storage box that is open on one side (here upward) and an auxiliary pull-in device 610 connected to the preceding stage, the auxiliary pull-in device of which can be positioned behind the upper direction-changing roller 340-1. The auxiliary pull-in device can be driven by an auxiliary drive and is configured to transport a workpiece, and therefore in this example a wire, to the buffer storage container 600 connected to the subsequent stage at a predetermined transport speed. The buffer storage container has an inlet and an outlet for the workpiece. The buffer storage container is formed so that the workpiece in the buffer storage container can form a workpiece loop 111 of variable length between the inlet and the outlet. Thus, the speed difference between the areas in front of and behind the buffer storage container can be compensated. Preferably, a sensor system is provided for detecting the degree of filling of the buffer storage container and generating a sensor signal indicating the degree of filling. In this case, the control device can be configured such that the transfer speed of the auxiliary pull-in device is controllable or controlled according to the sensor signals of the sensor system. The buffer storage can also be incorporated horizontally if necessary, so that the workpiece loop is formed in a substantially horizontally oriented plane. For further details and variations, refer to International Publication No. 2020 / 224977(A1), the disclosure of the supply device therein is incorporated by reference in this specification.

[0072] The straightening system 400 has two roller straightening machines 400-1 and 400-2, which are positioned directly in front of and behind each other and are independently adjustable, each having several axially parallel straightening rollers. Here, each has seven straightening rollers, but other numbers, such as 5 to 9, are also possible. The rotational axes of the straightening rollers of the sequentially connected straightening machines are oriented perpendicular to each other.

[0073] In a roller straightening machine, the straightening rollers are adjusted to be eccentric with respect to the neutral axis of the material to be straightened, thereby generating a changing curve that deforms the material to be straightened into a plastic region, and thus straightens it. Unlike roller straightening machines, the straightening rollers here are passive, i.e., not rotationally driven, and therefore there is no drive to rotate the straightening rollers. The wire is pulled through the roller straightening machine. For this purpose, a pull-in device 385 is provided, which is located behind the straightening system 400 in the direction of material flow, and is used in particular to pull the wire material through the two roller straightening machines 400-1 and 400-2 of the straightening system 300 toward the subsequent components.

[0074] The components of the straightening system 400 are supported by a frame portion, which can also house the control unit 390 of the supply unit 310. This frame portion also supports a retraction device 385. In one example, the retraction device 385 is formed as a drum retraction device, and in other embodiments, it may be formed as a belt retraction device or a pliers-type retraction device. A selective, optionally manually operated clipping device may be provided behind the retraction device 385 in the material flow direction, which can fix the axial position of the passing wire as needed.

[0075] Further details are illustrated in Figure 2, which shows an enlarged view of the first roller straightening machine 400-1 effective in the vertical plane (xz plane).

[0076] The first roller straightening machine 400-1 has seven passive straightening rollers R1, ... R7, each with horizontal rotation axes parallel to one another, and they are alternately arranged on opposite sides of the passage section (parallel to the x-axis) in the passage direction 115. These straightening rollers determine the effective straightening geometric arrangement of the roller straightening machine by their circumferential sections that contact the material to be straightened 110 during the driving of the straightening system. The first roller straightening machine 400-1 changes the curvature substantially only in the plane perpendicular to the straightening plane (xz plane). The second roller straightening machine 400-2, which is responsible for straightening in the horizontal plane, is constructed similarly, but here the rotation axes of the straightening rollers extend vertically.

[0077] In this example, all seven straightening rollers are designed as automatically deliverable straightening rollers and, in response to control signals from control unit 390, can be automatically and independently delivered bidirectionally in a delivery direction (parallel to the z-axis) oriented perpendicular to the direction of passage by servo motor drives 405-1, ... 405-7.

[0078] There are also variations in which all straightening rollers are manually adjustable. For this purpose, adjustment screws and position indicators can be provided, for example. There are also examples in which some straightening rollers (e.g., 2, 3, or 4) are automatically delivered, and some others (e.g., 3, 4, or 5) are manually delivered.

[0079] Due to the high degree of freedom in adjustment, a highly experienced machine operator is required for the proper adjustment of a roller straightening machine. Each adjustment operation or adjustment requires a considerable amount of time.

[0080] The adjustment station 350 or adjustment station 350 has a cutting device 370, which cuts a rod-shaped wire section 110-A that has been straightened as a sample during the adjustment process in the straightening system from the supplied wire, thereby preparing it for linearity testing. In example, an automated cutting device 370 is provided, or a manually operated cutting device may be provided instead. Furthermore, the adjustment station 350 has a measuring device 500.

[0081] The wire section or wire rod 110-A separated by the cutting device is inspected for linearity or residual curvature by a measuring device 500 connected downstream. In this case, a rotation prevention device ensures that the rotational position of the material rod provided for measurement does not change about its longitudinal axis, so that the wire is measured at the rotational position after passing through the straightening system.

[0082] The measuring device 500 and the associated cutting device 370 are components of the measuring unit 350, which, in some cases, can form a self-contained unit with other components and be used as an adjustment station 350. Therefore, the same reference numeral 350 is used for the adjustment station and the measuring unit.

[0083] Figure 3 shows a close-up of the components of the measuring device 500. The measuring device 500 has a first clamping device 510-1 on the side facing the cutting device 370, and a second clamping device 510-2 at a distance behind it. These clamping devices are mounted on a carriage, which runs on two guide rails 501, and these guide rails are fixed on a horizontally oriented base plate 502. Thus, the axial spacing of the clamping devices, which is measured parallel to the direction of passage, can be adjusted steplessly. Each clamping device has one mounting roller 512-1, 512-2 mounted on a horizontal rotation axis and two lateral positioning rollers 514-1, 514-2 that are displaceable by compressed air. Thus, the inserted wire rod can be fixed to precisely defined fixing points in both the vertical and horizontal directions. Since the rollers contact the wire without the introduction of any other force or torque, the wire rod is placed in fixed positions defined at the front and rear and is subjected only by gravity between them during operation. The rod cannot rotate about its axis when it is softly clamped between the horizontally sliding rollers 514-1 and 514-2.

[0084] The components of the measuring system 520 are mounted in the area between clamping devices 510-1 and 510-2. These are supported by a cross-shaped support 522, which is mounted on a carriage, and the carriage is capable of traveling on a guide rail 501, which also guides the clamping devices. The measuring system 520 is an optical measuring system that can determine the position of a wire placed in a measuring plane 524 oriented perpendicular to the x-direction with extreme precision. A second laser unit 525-2 is mounted above a straight coupling line between the fixed points, which generates a laser beam curtain located in the measuring plane 524, and this beam enters the detection area of ​​a photosensitive sensor 527-2 on the opposite side, so that the position of the wire in the lateral (horizontal) direction in the projection can be accurately detected. The position in the vertical direction is detected by the first laser unit 525-1 and the opposing sensor 527-1. The measurement is preferably performed horizontally or vertically by two lasers at the center between the two fixed members.

[0085] The enlarged detail in Figure 3A shows a typical measurement setup. In this setup, the plus sign indicates the intersection of the connecting line between the fixing point and the measurement plane 524. The shaded circle represents the position of wire section 110-A at the center between the clamping devices. From the horizontal distance value ΔH and the vertical distance value ΔV, the residual curvature of the wire rod in each straightening plane can be calculated. Thus, the results are specific to the straightening plane and, in some cases, are obtained separately for each of the two roller straightening machines, and are therefore appropriately evaluated to provide guidance for improving the straightening geometric arrangement.

[0086] When evaluating, it is taken into consideration that the wire rod will produce a predetermined sag based solely on gravity, and that the degree of this sag depends on the material properties and the distance between the fixing points. This amount is excluded from the calculations when evaluating. As a result of the measurements, a quantitative value for residual curvature is obtained, which may also have contributions in the horizontal and vertical directions. Based on these measurements, the straightening geometry of the roller straightening machine must then be adjusted so that the residual curvature disappears in the next wire section.

[0087] The inventor sees a potential problem when processing round materials. A round bar that still has a significant bulge in the horizontal plane after straightening may, upon insertion into the measuring device, spontaneously roll to a stable rotational position, where the bulge may sag downwards. This can mask a non-existent vertical bulge, leading to erroneous measurement results and, consequently, erroneous delivery and / or erroneous delivery in the wrong straightening machine.

[0088] To ensure that the measurement results can be accurately mapped (horizontal and vertical) to different straightening planes or roller straightening machines, special measures are taken where necessary to ensure that the wire rod provided for measurement cannot rotate around its longitudinal axis while it is separated from the rest of the material being straightened for measurement. For this purpose, the measurement system is configured for straightening plane-specific or straightening plane-selective measurement.

[0089] The modified method schematically shown in Figures 4A to 4C is suitable for many materials of various cross-sectional shapes, especially for round materials. In this case, first, the front end section 112 of the material to be straightened, continuous with the front front side 113, is moved to the measuring position in the measuring device 500 by controlled feed (by a retraction device 385 connected to the preceding stage) (Figure 4A), then it is contacted on the diametrically opposed side by laterally sliding rollers 514-1 or 514-2 of clamping devices 510-1, 510-2, thereby clamping it horizontally and thus preventing rotation (Figure 4B), and only then is the rod to be measured separated from the rest of the material to be straightened (Figure 4C). Then, measurement is started by the optical measuring system 520.

[0090] The horizontally traversable rollers 514-1 or 514-2 of the clamping device function as anti-rotation devices, making contact with the wire material at two diametrically opposed contact points in the horizontal direction with relatively low pressure, such that adhesive friction is sufficient to prevent the rod from self-rotating around its longitudinal axis, while at the same time allowing the wire rod to relax so that no force other than gravity acts upon it, thus exhibiting the residual curvature to be measured.

[0091] Using Figures 5A to 5D, variations of other methods for inspecting the linearity of a rod using a measuring device are illustrated. First, a wire having a flat rectangular cross-section (see details) is fed to the cutting position by a wire feeder 385. This is particularly characterized by the fact that the front end 113 of the rod has already reached the rear or the mounting roller of the second clamping device 510-2 and is placed thereon. During this insertion operation, the lateral positioning roller is in its retracted position. Then, cutting is performed by the cutting device 370 (Figure 5B). In the next method step (Figure 5C), the cut wire piece is moved further forward to its measuring position, where the wire rod is centered with respect to the measuring plane in which the center is located, with pieces of equal length on both sides extending beyond the mounting roller. No special device is required for this short wire feed. Rather, the subsequent wire piece can arrive at the rear front end of the wire rod to be measured by the puller 385, thereby providing a horizontal feed in the form of a thrusting rod. In the next stage (Figure 5D), the lateral positioning roller is moved in the direction of a fixed position determined by its pneumatic cylinder. Furthermore, the wire section is pressed against the rear stopper, thereby ensuring the defined plane. Thus, the wire rod is fixed for measurement. It can be clearly seen that the connecting line between the front and rear fixed positions does not need to be coaxial with the feed axis of the subsequent wire.

[0092] A preferred measuring device and method is described in the example of adjusting a deformation machine in the form of a feeding device, which, in its prescribed use, has a built-in straightening system that shapes straightened wire material from wire material arriving with a changing input curvature supplied from a coil, and the wire material is supplied as "endless material" to a deformation machine connected downstream.

[0093] This straightening system can have exactly two roller straightening machines, which preferably form a straightening plane perpendicular to each other. The straightening system can also have three, four, or more roller straightening machines. For example, the straightening system can have four straightening machines, each displaced by 45°, which can be a preferred variation for straightening, for example, round wires.

[0094] The deformation machine built into the straightening system may be a straightening and cutting machine, which is designed to straighten wires or other semi-finished materials that can be processed by straightening, having various cross-sectional sizes and shapes, and then separate the straightened material into desired lengths. In this case, the machine further has a length measuring device and a cutting device, the cutting device preferably being able to operate automatically based on a signal from the length measuring device. The measuring unit can then measure the separated and straightened rods. The measuring unit does not require a dedicated cutting device for this purpose. Alternatively, it may be a rod mass production machine, which, in addition to the straightening system, cutting device and length measuring device, further has an insulation removal device, thereby removing the insulating section from the initial metal material covered with an insulating layer.

[0095] The straightening system can also be integrated into a deformation machine, which can, in an automated manufacturing process, form relatively small or relatively large series of molded parts with partially complex geometric arrangements from a material straightened with appropriate deformation tools. In this case, the deformation tools required for deformation are connected downstream of the straightening system. The deformation machine can be, for example, a bending machine for forming bent parts from wire, band, or pipe materials, or a spring forming machine, or a wire nailing machine for mass production of screws, nails, rivets, etc.

[0096] The present invention is applicable to various types of materials to be straightened, particularly for straightening metal wire or pipe materials. The cross-sectional shape of the material to be straightened can vary, for example, a circular cross-section for round materials, a corrugated and / or polygonal cross-section for profile materials, and especially a rectangular cross-section for square materials. Flat materials, such as metal flat bands with a large aspect ratio between width and height, can also be straightened. The size of the cross-section can also be varied. Metal materials may or may not be coated, or they may have a coating, such as an insulating layer made of electrically non-conductive plastic.

[0097] Linearity inspection or measurement does not need to be performed as described in the examples. Linearity inspection can also be performed automatically using at least one camera. For example, in the case of flat materials, linearity can be inspected during passage using, for example, two cameras displaced by 90°. In particular, for round wires, a camera that rotates around the wire or a laser scanner can be used.

[0098] Various embodiments are described using Figures 6 to 9, each having a device for generating rotational position markings on the supply unit side and a rotational position adjustment assist device on the measurement unit side. Thus, rotational position markings can be generated on the rod-shaped section on the supply unit side, thereby enabling unambiguous confirmation of at which rotational position or rotational space position the rod-shaped section has been straightened. The measurement unit side is provided with a rotational position adjustment assist device adapted to it, which functionally cooperates with the rotational position markings on the rod-shaped section to house the section in the measurement unit at a predetermined rotational position, so as to enable unambiguous relating the measurement value obtained by the measurement unit to the rotational position at which the material to be straightened has passed through the straightening system. The transfer of the rod-shaped section between the supply unit and the measurement unit can be performed manually, semi-automatically, or automatically, and it is not necessary to maintain a predetermined rotational position or orientation of the rod-shaped section throughout the entire transfer. For example, the operator can separate the marked rod-shaped section from the wire, grasp it, insert it into the measuring unit, and then insert the wire into the measuring unit at the correct rotational position using the rotational position marking and a corresponding rotational position adjustment assist device.

[0099] Figures 6A to 6D show the area of ​​the pull-in device 385 and the subsequent connected cutting device 370 in one embodiment, at various stages of creating a rotational position marking on the rod-shaped section 110-A of the material to be straightened 110. The material to be straightened is, in this case, a round wire. Figure 6A shows the cutting tool before it enters the wire during the cutting operation. Figure 6B shows the retraction movement of the cutting tool after the wire has been separated. By cutting, the rod-shaped section is separated and the following is about to be formed. After the separation of the resulting rod-shaped section, the wire is advanced a little, for example, a few centimeters, by the pull-in device 385. Then, in a notching operation by the upper cutting tool 370-1, a V-shaped notch 115-1 is imprinted or made on the upper side of the wire, a little from the front end (Figure 6C). After the cutting tool 370-1 used for notching is retracted, the rotational position marking 115-1 formed by the notch 115-1 is visible on the upper side of the wire. The wire (the material to be straightened) is then fed a distance until the next separation point reaches the area of ​​the cutting device 370. The rod-shaped section 110-A marked by the notch 115-1 is then separated.

[0100] When the wire forms the notch 115-1 (Figure 6C), it is still suspended from the supplied wire, so the bottom of the V-shaped notch extends parallel to the horizontal direction, the notch is on the upper side, and the vertical direction is recognizable from there. Therefore, the rotational position of the wire during correction can be uniquely determined using the notch 115-1.

[0101] Figure 6E shows the insertion of the rod-shaped section 110-A into the measuring device 500 in the appropriate orientation or rotational position, which can be confirmed using the notch 115-1 or the rotational position marking. The rod-shaped section 110-A is placed on the mounting rollers 512-1 and 512-2 such that the rod end with the marking 115-1 is on the other side of the rear mounting roller 512-2. The measuring unit has a rotational position adjustment auxiliary device 550 with a downward-facing wedge 555, the V-shape of which corresponds to the shape of the edge of the cutting tool 370-1. Thus, the wire can be precisely oriented to pass through the straightening unit using the marking on the wire and the appropriate notch at the measuring station. Thus, the curvature component represented by the measurement data can be uniquely mapped to different straightening planes of the roller straightening machine (straightening plane-specific measurement).

[0102] In the modified example shown in Figure 6, a notch operation separate from the cutting operation is provided after the wire feed to generate a notch 115-1 used as a rotation position marking. However, in the modified examples shown in Figures 7A to 7C, the rotation position marking is formed during the cutting operation. The cutting device here has an upper cutting tool 370-1 with a bevel on one side, which cooperates with a lower cutting tool that does not cut, acting as a counter holder. Since the cutting motion is performed from only one side, a beveled chamfer 115-2 is created at the end of the wire as a rotation position marking, and its orientation clearly determines the rotation position of the wire during cutting.

[0103] Within the corresponding measuring unit, a rotational position adjustment assist device 550 is located beyond the second mounting roller, which has a vertically movable stopper, the stopper having a bevel at its lower end corresponding to the bevel provided on the cutting wedge of the cutting tool. The rod-shaped section is inserted such that the chamfer 115-2 provided on the front side of the rod-shaped section 110-A is in planar contact with this stopper. Thus, the correct orientation is determined by mechanical contact with this bevel. Subsequently, the stopper is moved away from engagement with the rod-shaped section so that the measurement is not impaired by contact with the stopper.

[0104] In the embodiment shown in Figure 8, after the separation of the preceding rod-shaped section, the short end of the wire at the front end of the next rod-shaped section 110-A is bent by approximately 90°, so that the short end piece 115-3 of the rod-shaped section protrudes radially parallel to the vertical plane. This bend, or radially protruding end piece 115-3, is used as a rotational position marking and is provided here, for example, by the cutting tool 370-1 itself, after the separation of the preceding rod-shaped section. Alternatively, another bending tool may be used.

[0105] The measuring device 500 (Figure 8B) is equipped with a rotational position adjustment assist device 550 having a marking counter member corresponding to the bend 115-3, the marking counter member having a cutout 556 into which the bend fits. The rod-shaped section 110-A is inserted into the measuring device so that the bent end piece fits into the cutout. For measurement, the marking counter member is moved downward so that the cutout disengages from the rod-shaped section, and no force is applied to this section for measurement.

[0106] Figure 9 schematically illustrates an alternative, in which the rotational position adjustment assist device 550 of the measuring device has a camera 558 that can detect the front end of the inserted rod-shaped section 110-A. Thus, the rotational position marking (e.g., bend 115-3) is determined non-contact here by an optical measuring system. Alternatively, a linear laser can be used as the optical measuring system. In that case, the measurements supplied from the optical measuring system are processed to determine the rotational position of the rod-shaped section 110-A during measurement, thereby forming a relationship with the orientation of the orthodontic plane within the orthodontic unit.

[0107] Schematic Figure 10 shows another embodiment of the measuring device 600, which is designed to measure a finite-length rod 110-A, after it has been straightened and separated from the subsequent material to be straightened, with respect to any possibly present curvature. The relatively simple and robustly constructed measuring device 600 can be installed in a suitable location in the manufacturing hall and can be used by various machine operators to measure the straightened rod with respect to any sometimes present curvature and, in such cases, to perform measurements specific to the straightened plane. The measuring device 600 can be mounted, for example, on a roller wagon, but can also be permanently mounted, of course.

[0108] The measuring device 600 has a relatively heavy, torsion-resistant base plate 605, which can be mounted, for example, on the upper side of a roller wagon and supports all other components of the measuring device. The measuring device 600 has a first fixing device 610-1 and a second measuring device 610-2 located at a distance from it in the x-direction. These are designed to accommodate the rod to be measured in a precisely defined spatial position without any force. This distance in the x-direction is dimensionally designed to be slightly shorter than the shortest rod to be measured.

[0109] Each fixing device has bearing blocks 612-1, 612-2 in the shape of plates that are vertically positioned in the yz plane. Above each bearing block, there are substantially V-shaped rod housings 615-1, 615-2 that widen upwards. The sides of the rod housings are each angled at 45° to the xz plane or vertical and are each formed in a roof shape, so that at the ridge of the roof shape, each rod housing forms only a point-like or linear contact surface with the rod into which it is inserted.

[0110] In this example, a rod 110-A made of a flat material having a rectangular cross-section is measured. The wider side is in line contact with one of the sides, and the narrower side is in line contact with the other side near the V-shaped bottom. This defines and fixes the position of the rod material in the direction perpendicular to the yz plane (z direction) and the direction lateral (y direction), and no forcing force acts on the placed rod (apart from gravity). Measurement of a round material is possible in exactly the same way, in which point-like contact areas are created on the edges that protrude inward from the sides of the rod housing.

[0111] A foldable stopper 640 is provided on the outside of the bearing block of the first fixing device 610-1, which allows the rod to be inserted in a simple manner so that the center of the rod is precisely centered between the mounting points of the fixing device.

[0112] When measuring flat materials, a precisely known relationship is usually established between the rotational position during straightening and cutting and the rotational position during measurement, provided that they are rotated 45° relative to each other. In the case of round materials, this relationship can be ensured, for example, by using rotational position markings (e.g., color markings, attached or clamped marking members, etc.) and an appropriate rotational position recognition device in the measuring apparatus.

[0113] If a straightened rod still has a relatively strong curvature and / or is slightly twisted after, for example, a first straightening process, it may not be possible to guarantee that the rod will be placed in the correct position on the two fixing points (front and rear or first and second fixing devices). Nevertheless, to ensure reliable measurement, in many embodiments, an additional clamping member is provided on one of the two fixing devices, which is formed to grip the section of the rod located within the rod housing and press that section against the side of the rod housing with a small force. This small force acting only on the terminal section of the rod ensures that the rod is in a specified rotational position within the rod housing and does not impose a coercive force on the entire rod that would alter the curvature to be measured.

[0114] The actual measurement is performed in much the same manner as the measurement procedure described in other embodiments. The components of the measuring system 620 are mounted in the center between the fixing devices 610-1 and 610-2. The measuring system operates optically and precisely determines the position of the wire or rod placed in the yz plane (measuring plane) located in the center between the fixing devices. The electro-optical components of the measuring system (two laser units and appropriate sensors for projection measurement) are fixed to a C-shaped support, which is open to the visible front side, thus allowing for comfortable manual insertion of the rod. Unlike the modified example shown in Figure 3, the measuring devices, which are oriented orthogonally to each other, are tilted at 45° to the horizontal direction (y-direction), rather than horizontal and vertical. This corresponds to the oblique position of the rod, which is created by the V-shaped housing of the fixing point. The oblique orientation allows for particularly accurate detection and evaluation of curvature components on the wide and narrow sides, for example, when measuring flat material (as shown in the example). For other functional methods, refer to the preceding embodiments. The following are also included in the nature of this disclosure: [Aspect 1] A measuring unit (350) for measuring the residual curvature in a straightened wire or pipe-shaped material to be straightened after passing through a straightening system comprising two sequentially connected adjustable roller straightening machines having straightening planes of different orientations, In a system for straightening a material, the rod-shaped sections (110-A) separated from the material after passing through the straightening system are each placed at a measurement position, and the system includes a measuring device (520) that obtains measurement data representing the residual curvature of the straightened material, The measurement unit (350) is configured for measurement specific to the straightening plane, and the measurement enables a unique correspondence between the curvature component represented by the measurement data and different straightening planes of the roller straightening machine. [Aspect 2] A device (510, 610) for fixing the rod-shaped section to a first fixing point and a second fixing point located at a distance from the first fixing point, such that only the vertical and horizontal positions of the rod-shaped material to be straightened are determined for each of the fixing points, and no force other than gravity is applied to the section of the rod-shaped material to be straightened located between the fixing points; A device (520, 620) for measuring the position of the material to be straightened within a measuring plane (524) located between the first and second fixing points; An apparatus for determining the residual curvature using positional data of the position of the material to be straightened at the first and second fixing points and within the measuring plane (524); A measuring unit according to embodiment 1, characterized by the following. [Aspect 3] The measuring unit according to embodiment 1 or 2, characterized in that the measuring unit has a cutting device (370) for separating a rod-shaped section (110-A) of a predetermined length from the material to be straightened after passing through the straightening system, and preferably the cutting device (370) is on a common frame together with the measuring device (500) or mounted on a common frame. [Aspect 4] The measuring unit according to embodiment 1, 2, or 3, characterized in that the measuring unit (350) is configured to measure the rotational position of the material to be straightened after passing through the straightening system (400). [Aspect 5] A measuring unit according to any one of embodiments 1 to 4, characterized in that a rotation prevention device (514-1, 514-2) is configured such that, between straightening and measurement, the rotational position of a separate rod-shaped section (110-A) provided for measurement does not change about its longitudinal axis, thereby allowing the material to be straightened to be measured at the rotational position after passing through the straightening system. [Aspect 6] A measuring unit according to any one of embodiments 1 to 5, characterized in that the control unit (390) is configured such that in drive mode, the cutting device (370) and the measuring device (500) are driven in sync, thereby moving the front end section (112) of the straightened material to a measuring position in the measuring device (500) by controlled feed, after which the material to be straightened is prevented from rotating by the rotation prevention devices (514-1, 514-2) of the measuring unit (350), particularly being held horizontally, and then the cutting device (390) is driven to separate the rod-shaped section to be measured from the rest of the material to be straightened. [Aspect 7] The measuring unit (350) has a rotational position adjustment assisting device (550), which is configured to functionally cooperate with a rotational position marking (115) provided on the rod-shaped section (110-A) that is suitable for confirming the rotational position of the rod-shaped section, so as to ensure that the rod-shaped section can be housed in the measuring unit so that the rod-shaped section can be measured at a predetermined rotational position that is known to the rotational position of the material being straightened as it passes through the straightening system (400), preferably the rotational position adjustment assisting device has at least one rotational position recognition device, which is configured to recognize the rotational position marking (115) provided on the rod-shaped section (110-A), and the rotational position recognition device preferably belongs to the following group: A camera (558) for optically detecting the rotational position marking; A measuring unit according to any one of embodiments 1 to 6, characterized in that a mechanical marking counter member for mechanical contact of the rotational position marking (115) is selected from a mechanical marking counter member, wherein the marking counter member preferably has a section equipped with a counter structure (556) complementary to the rotational position marking such that the desired rotational position of the rod-shaped section can be adjusted by contact. [Aspect 8] The measuring device (500) has a first clamping device (510-1) on the entrance side and a second clamping device (510-2) at a distance from it in the longitudinal direction, and the components of the measuring system (520) are arranged in the area between the clamping devices (510-1, 510-2), and the measuring system is designed to define a measuring plane (524) oriented laterally, particularly perpendicularly, to the longitudinal direction, and to define the position of a rod-shaped section (110-A) placed within the measuring plane (524). The measuring unit according to any one of embodiments 1 to 7, wherein each of the clamping devices preferably has one mounting roller (512-1, 512-2) mounted on a horizontal axis of rotation, and two lateral positioning members, particularly lateral positioning rollers (514-1, 514-2) or lateral positioning blocks that are displaceable by a drive, such that the inserted rod-shaped sections can be fixed to fixed locations defined in the vertical and horizontal directions, respectively. [Aspect 9] The measuring unit according to embodiment 8, characterized in that the spacing between clamp devices (510-1, 510-2) measured parallel to the longitudinal direction is infinitely adjustable, preferably the clamp devices are mounted on a carriage, the carriage travels on a guide rail (501), the guide rail is fixed to the upper side of a horizontally oriented base plate (502) of the measuring system, and / or the components of the measuring device are fixed on a support (522), the support is mounted on a carriage, the carriage is capable of traveling on the guide rail (501), and the guide rail also guides the clamp devices. [Aspect 10] The measuring system (520) is an optical measuring system for determining the position of the rod-shaped section in a measuring plane (524) located between the clamping devices, wherein the measuring system preferably has a first laser unit (525-1) and a second laser unit (525-2), which each generate a laser light curtain extending into the measuring plane in a measuring direction oriented laterally, particularly perpendicular to each other, and each laser unit is opposed to the laser unit, wherein a sensor unit having a photosensitive sensor is arranged to detect the projection of the portion of the rod-shaped section (110-A) passing through the measuring plane, as described in any one of embodiments 1 to 9. [Aspect 11] A measurement method for measuring the residual curvature of a straightened wire or pipe-shaped material that has passed through a straightening system comprising two roller straightening machines having straightening planes of different orientations and connected front to back, wherein a rod-shaped section (110-A) of a predetermined length is separated from the material that has passed through the straightening system (400) by a cutting device (370), and the rod-shaped section is measured by a measuring device (500), the measuring device comprising a measuring device (520) for housing the rod-shaped section (110-A) separated from the material into a measurement position, and a device for obtaining measurement data representing the residual curvature of the straightened material, A measurement method characterized by measuring the straightening plane in which the curvature component obtained based on the aforementioned measurement data is associated with different straightening planes of the roller straightening machine. [Aspect 12] The measurement method according to embodiment 11, characterized in that the rotational position of the material to be corrected with respect to its longitudinal axis does not change between the correction and measurement, and the measurement is performed at the rotational position where the material to be corrected has passed through the correction system. [Aspect 13] To measure the rod-shaped section of the material to be straightened, first, the front end section (112) of the straightened material is moved to the measurement position in the measuring device (500) by controlled feed, and then the material to be straightened is prevented from rotating by rotation prevention, particularly by clamping in the horizontal direction, and Subsequently, the rod-shaped section (110-A) to be measured is separated from the rest of the material to be straightened. The measurement method according to embodiment 11 or 12, characterized by the features described herein. [Aspect 14] The following steps: A step of forming a rotational position marking (115) on the rod-shaped section (110-A) that is suitable for determining the rotational position of the rod-shaped section; A step of transferring the rod-shaped section having the rotational position marking to the measuring unit (350); and A step of positioning the rod-shaped section (110-A) having the rotational position marking (115) at a predetermined rotational position to the measurement position of the measurement unit, wherein the predetermined rotational position is in a known relationship with respect to the rotational position where the material to be straightened has passed through the straightening system (400), The predetermined rotational position is adjusted using the rotational position adjustment assist device (550) of the measuring unit, and the rotational position adjustment assist device is configured to cooperate with the rotational position marking (115) on the rod-shaped section to ensure that the rod-shaped section is positioned at the predetermined rotational position. A measurement method according to any one of embodiments 11 to 13, characterized by the features described herein. [Aspect 15] The formation of the rotational position marking (115) is carried out by the following measures: Forming a notch or other recessed structure around the periphery of the material to be straightened; To form a bent section at the end of the material to be straightened; To form a chamfer on the end of the material to be straightened; To form color markings or laser markings; Removing one side of a portion of the insulating layer; Attaching a separately formed, fitted marking member to the rod-shaped section, particularly by attachment, clipping, or adhesive, preferably by 3D printing; and Preferably, a self-adhesive sticker is attached to the side of the aforementioned rod-shaped section, or on top of it. The measurement method according to embodiment 14, characterized in that it includes one of the following. [Aspect 16] The measurement of the straightened material is carried out in the following steps: The step of fixing the straightened material to a first fixing point and a second fixing point spaced apart from the first fixing point, in such a way that a vertical and horizontal position of the material to be straightened is provided for each of the fixing points, and no force other than gravity is applied to the section of the material to be straightened located between the fixing points; A step of measuring the position of the material to be straightened within a measuring plane (524) located between the first and second fixing points; and A measurement method according to any one of embodiments 11 to 15, characterized by having the step of determining the residual curvature using positional data for the position of the material to be straightened at the first fixing point and the second fixing point, and within the measuring plane (524). [Aspect 17] A measurement method according to any one of embodiments 11 to 16, characterized in that an optical measurement system is used for measurement, the optical measurement system preferably uses laser radiation to generate two laser light curtains perpendicular to each other located in the measurement plane, and detects them using opposing photosensitive sensors, thereby determining the position of the material to be corrected in the measurement plane in two directions with great precision by projection. [Aspect 18] A method for adjusting a straightening system (400) to remove the curvature of a wire-shaped or pipe-shaped material (110) passing through, particularly for use in a deformation machine for forming straight or curved molded parts from a material to be straightened, The straightening system (400) comprises two sequentially connected adjustable roller straightening machines (400-1, 400-2) having straightening planes of different orientations. From the material to be straightened, which has passed through the straightening system (400), a rod-shaped section (110-A) of a predetermined length is separated using a cutting device (370). The rod-shaped section is measured by a measuring device (500), and the measuring device includes a measuring device (520) for housing the rod-shaped sections (110-A) separated from the material to be straightened within the measurement position, and a device for obtaining measurement data representing the residual curvature of the straightened material, The straightening geometric arrangement of at least one roller straightening machine (400-1, 400-2) is modified according to the measurement data, namely, such that the residual curvature of the subsequently straightened section of the material to be straightened is improved with respect to the target residual curvature by the modification of the straightening geometric arrangement. In terms of things, A method for adjusting an orthodontic system, characterized in that a measuring device described in any one of embodiments 1 to 10 is used.

Claims

1. A measuring unit (350) for measuring the residual curvature of a straightened wire or pipe-shaped material to be straightened after passing through a straightening system comprising two sequentially connected adjustable roller straightening machines having straightening planes of different orientations, In a system comprising a measuring device (500) that houses rod-shaped sections (110-A) of a material to be straightened, separated from the material to be straightened, at measurement positions, and obtains measurement data representing the residual curvature of the straightened material, the measuring unit (350) is A device (510, 610) for fixing the rod-shaped section to a first fixing point and a second fixing point located at a distance from the first fixing point, such that only the vertical and horizontal positions of the rod-shaped material to be straightened are determined for each of the first and second fixing points, and so that no force other than gravity is applied to the section of the rod-shaped material to be straightened located between the first and second fixing points; A device (520, 620) for measuring the position of the material to be straightened within a measuring plane (524) located between the first and second fixing points; An apparatus for determining the residual curvature using positional data of the position of the material to be straightened at the first fixing point, the second fixing point, and within the measuring plane (524); Furthermore, The measurement unit (350) is configured for measurement specific to the straightening plane, and the measurement enables a unique correspondence between the curvature component represented by the measurement data and different straightening planes of the roller straightening machine.

2. The measuring unit according to claim 1, wherein the measuring unit has a cutting device (370) for separating a rod-shaped section (110-A) of a predetermined length from the material to be straightened after passing through the straightening system, and preferably the cutting device (370) is on a common frame together with the measuring device (500), or mounted on a common frame.

3. The measuring unit (350) is configured to measure the rotational position of the material to be straightened after passing through the straightening system (400), as described in claim 1.

4. The measuring unit according to claim 1, further comprising rotation prevention devices (514-1, 514-2), wherein the rotation prevention devices are configured such that, between straightening and measurement, the rotational position of a separate rod-shaped section (110-A) provided for measurement does not change about its longitudinal axis, thereby allowing the material to be straightened to be measured at the rotational position after passing through the straightening system.

5. The measuring unit according to claim 2, further comprising a control unit (390) configured such that in drive mode, the control unit drives the cutting device (370) and the measuring device (500) in sync, thereby moving the front end section (112) of the straightened material to a measuring position in the measuring device (500) by controlled feed, after which the material to be straightened is prevented from rotating by the rotation prevention devices (514-1, 514-2) of the measuring unit (350), particularly being held horizontally, and then the cutting device (370) is driven to separate the rod-shaped section to be measured from the rest of the material to be straightened.

6. The measuring unit (350) has a rotational position adjustment assisting device (550), which is configured to functionally cooperate with a rotational position marking (115) provided on the rod-shaped section (110-A) that is suitable for confirming the rotational position of the rod-shaped section, so as to ensure that the rod-shaped section can be housed in the measuring unit so that the rod-shaped section can be measured at a predetermined rotational position that is in a known relationship to the rotational position of the material to be straightened as it passes through the straightening system (400), preferably the rotational position adjustment assisting device has at least one rotational position recognition device, which is configured to recognize the rotational position marking (115) provided on the rod-shaped section (110-A), and the rotational position recognition device preferably belongs to the following group: A camera (558) for optically detecting the rotational position marking; The measuring unit according to claim 1, characterized in that a mechanical marking counter member for mechanical contact of the rotational position marking (115) is selected from a mechanical marking counter member, wherein the mechanical marking counter member preferably has a section equipped with a counter structure (556) complementary to the rotational position marking such that the desired rotational position of the rod-shaped section can be adjusted by contact.

7. The measuring unit according to claim 1, wherein the measuring device (500) has a first clamping device (510-1) on the entrance side and a second clamping device (510-2) at a distance from it in the longitudinal direction, and the components of the measuring system (520) are arranged in the area between the clamping devices (510-1, 510-2), and the measuring system is designed to define a measuring plane (524) oriented laterally, particularly vertically, with respect to the longitudinal direction, and to define the position of a rod-shaped section (110-A) placed within the measuring plane (524), and preferably each of the clamping devices has one mounting roller (512-1, 512-2) mounted on a horizontal axis of rotation and two drive-displaceable lateral positioning members, particularly lateral positioning rollers (514-1, 514-2) or lateral positioning blocks, such that the inserted rod-shaped section can be fixed to fixed locations defined in the vertical and horizontal directions, respectively.

8. The measuring unit according to claim 7, characterized in that the spacing between clamp devices (510-1, 510-2) measured parallel to the longitudinal direction is infinitely adjustable, preferably the clamp devices are mounted on a carriage, the carriage travels on a guide rail (501), the guide rail is fixed to the upper side of a horizontally oriented base plate (502) of the measuring system, and / or the components of the measuring system are fixed on a support (522), the support is mounted on a carriage, the carriage is capable of traveling on the guide rail (501), and the guide rail also guides the clamp devices.

9. The measurement system (520) is an optical measurement system for determining the position of the rod-shaped section in a measuring plane (524) located between the clamping devices, preferably the measurement system having a first laser unit (525-1) and a second laser unit (525-2), which each generate a laser light curtain extending into the measuring plane in a measuring direction oriented laterally, particularly perpendicular to each other, and each laser unit is opposed to a sensor unit having a photosensitive sensor for detecting the projection of the portion of the rod-shaped section (110-A) passing through the measuring plane, characterized in that the measurement system of the 7th generation is an optical measurement system for determining the position of the rod-shaped section in a measuring plane (524) located between the clamping devices, preferably the measurement system has a first laser unit (525-1) and a second laser unit (525-2), which each generates a laser light curtain extending into the measuring plane, and each laser unit is opposed to a sensor unit having a photosensitive sensor for detecting the projection of the portion of the rod-shaped section (110-A) passing through the measuring plane.

10. A measurement method for measuring the residual curvature of a straightened wire or pipe-shaped material that has passed through a straightening system comprising two roller straightening machines having straightening planes of different orientations and connected front to back, wherein a rod-shaped section (110-A) of a predetermined length is separated from the material that has passed through the straightening system (400) by a cutting device (370), and the rod-shaped section is measured by a measuring device (500), the measuring device (500) comprising a measuring system (520) for housing the rod-shaped section (110-A) separated from the material into a measurement position, and a device for obtaining measurement data representing the residual curvature of the straightened material, Since the rotational position of the material to be corrected, with respect to its longitudinal axis, does not change between the correction and measurement, the measurement is taken at the rotational position where the material to be corrected has passed through the correction system. In order to measure the rod-shaped section of the material to be straightened, first, the forward end section (112) of the straightened material to be straightened is moved to the measurement position in the measuring device (500) by controlled feed, and then the material to be straightened is prevented from rotating by a rotation prevention mechanism, and Subsequently, the rod-shaped section (110-A) to be measured is separated from the rest of the material to be straightened. A measurement method characterized by measuring the straightening plane in which the curvature component obtained based on the aforementioned measurement data is associated with different straightening planes of the roller straightening machine.

11. The measurement method according to claim 10, characterized in that the material to be straightened is prevented from rotating by clamping in the horizontal direction.

12. The following steps: A step of forming a rotational position marking (115) on the rod-shaped section (110-A) that is suitable for determining the rotational position of the rod-shaped section; A step of transferring the rod-shaped section having the rotational position marking to a measuring unit (350); and The step of positioning the rod-shaped section (110-A) having the rotational position marking (115) at a predetermined rotational position to the measurement position of the measurement unit, wherein the predetermined rotational position is in a known relationship with respect to the rotational position where the material to be straightened has passed through the straightening system (400), The predetermined rotational position is adjusted using the rotational position adjustment assist device (550) of the measuring unit, and the rotational position adjustment assist device is configured to cooperate with the rotational position marking (115) on the rod-shaped section to ensure that the rod-shaped section is positioned at the predetermined rotational position. The measurement method according to feature 10.

13. The formation of the rotational position marking (115) is carried out by the following measures: Forming a notch or other recessed structure around the material to be straightened; To form a bent section at the end of the material to be straightened; To form a chamfer on the end of the material to be straightened; To form color markings or laser markings; Removing one side of a portion of the insulating layer; Attaching a separately formed, appropriately shaped marking member to the rod-shaped section, particularly by attachment, clipping, or adhesive, preferably by 3D printing; and Preferably, a self-adhesive sticker is attached to the side of the aforementioned rod-shaped section, or on top of it. The measurement method according to claim 12, characterized in that it includes one of the following.

14. The measurement of the straightened material is carried out in the following steps: The step of fixing the straightened material to be straightened to a first fixing point and a second fixing point spaced apart from the first fixing point, in such a way that a vertical position and a horizontal position of the material to be straightened are provided for each of the first and second fixing points, and no force other than gravity is applied to the section of the material to be straightened located between the first and second fixing points; A step of measuring the position of the material to be corrected within a measuring plane (524) located between the first and second fixing points; and The measurement method according to claim 10, further comprising the step of determining the residual curvature using positional data for the positions of the material to be straightened at the first fixing point and the second fixing point, and within the measuring plane (524).

15. The measurement method according to any one of claims 10 to 14, wherein an optical measurement system is used for measurement, the optical measurement system preferably uses laser radiation to generate two mutually perpendicular laser light curtains located in the measurement plane, and detects them using opposing photosensitive sensors, thereby very accurately determining the position of the material to be corrected in the measurement plane in two directions by projection.

16. A method for adjusting a straightening system (400) to remove the curvature of a wire-shaped or pipe-shaped material (110) passing through, particularly for use in a deformation machine for forming straight or curved molded parts from a material to be straightened, The orthodontic system (400) comprises two sequentially connected adjustable roller orthodontic machines (400-1, 400-2) having orthodontic planes of different orientations. From the material to be straightened, which has passed through the straightening system (400), a rod-shaped section (110-A) of a predetermined length is separated using a cutting device (370). The rod-shaped section is measured by a measuring device (500), and the measuring device includes a measuring system (520) for housing the rod-shaped sections (110-A) separated from the material to be straightened within the measurement position, and a device for obtaining measurement data representing the residual curvature of the straightened material, The straightening geometric arrangement of at least one roller straightening machine (400-1, 400-2) is modified according to the measurement data, namely, such that the residual curvature of the subsequently straightened section of the material to be straightened is improved with respect to the target residual curvature by the modification of the straightening geometric arrangement. In things, A method for adjusting an orthodontic system, characterized in that a measuring unit according to any one of claims 1 to 9 is used.

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