EP1622732A1 - Spring winding machine and method for controlling a spring winding machine - Google Patents
Spring winding machine and method for controlling a spring winding machineInfo
- Publication number
- EP1622732A1 EP1622732A1 EP04731869A EP04731869A EP1622732A1 EP 1622732 A1 EP1622732 A1 EP 1622732A1 EP 04731869 A EP04731869 A EP 04731869A EP 04731869 A EP04731869 A EP 04731869A EP 1622732 A1 EP1622732 A1 EP 1622732A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- winding machine
- wire
- spring winding
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C51/00—Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/02—Coiling wire into particular forms helically
Definitions
- the invention relates to a spring winding machine and a method for controlling a spring winding machine in accordance with the preamble of claims 1 and 7.
- spring wire is generally used by means of a conveyor from a reel withdrawn and fed to a molding device.
- the forming device can comprise one or more winding tools which deflect the spring wire during advancement and thereby form a spring.
- the winding tools can be fixedly and immovably connected to the machine or In the latter case, the tools can be moved, for example, by a rotatable cam disc or by a servo motor and / or a piezotranslator.
- the properties of the springs produced can deviate more or less strongly from the desired target properties.
- material properties such as wire diameter, warping or twisting, composition of the mixed structure, internal stresses or micro-crack fields can affect tensile strength, the modulus of elasticity or other properties that influence the deformability of the wire.
- electrical properties such as conductivity or impedance or permeability
- the material inhomogeneities can lead to the fact that the properties of the springs produced are not constant.
- shape parameters such as, for example, winding diameter, pitch, etc. and / or mechanical properties such as, for example, the spring constants can have considerable bandwidths. The manufacture of geometrically precise springs with properties within narrow tolerance limits is often difficult.
- An adaptive spring winding device is known from DE-Al-19534189, in which means are provided for improving the constancy of the spring properties. Downstream there are one after the forming tool Means for monitoring the wire and for generating output signals are provided, which are characteristic of the physical characteristics of the bent wire. The output signals are fed to the control and used by the control for fine positioning of the forming tool or its position, in such a way that the outer diameter or the inner diameter of the springs is maintained.
- a disadvantage of this spring winding device is that the influence of different wire properties on physical properties of the spring to be produced is only recorded during or after the forming process. Only after measuring inner diameters or
- the spring winding machine comprises a measuring device with at least one measuring sensor arranged in front of the converter in the direction of the wire.
- the measurement sensor or sensors detect measurement quantities of the wire to be formed, the physical and / or chemical properties of which are given or co-determined.
- the machine controller controls the forming device not only as a function of predefined instructions or regulations, but also as a function of measured quantities, which are detected by the sensors which are upstream of the wire-forming system.
- the processing instructions on how to process the measurement quantities into control quantities for the forming device can be predefined or predefinable by the control system, but they can also be determined by the control system itself.
- the control can detect further input or measurement quantities which are related to the properties of the springs produced.
- the control can record manual inputs on a user interface, for example, corrective inputs for position or position control a converter, which lead to the fact that the springs have the desired target properties. This corresponds to an open control loop in which a model is created or adapted with processing instructions.
- the control can also record measurement variables from test sensors which represent properties of the springs produced or deviations from these properties from desired target properties that can be stored in a storage medium of the control.
- the control is designed according to the invention in such a way that it can relate measurement variables of the upstream measurement sensors and input or measurement variables which are related to the properties of the springs produced and can establish correlations between the measurement variables and / or functions derived from the measurement variables.
- the control system can determine the regularities between the measurement parameters of the upstream measurement sensors and the properties of the springs manufactured.
- the controller taking into account the measurement parameters of the measurement sensors, can control or influence the forming device in such a way that the springs produced have the desired or specified target properties and thus compensate for fluctuations in the wire properties.
- Figure 1 is a schematic schematic diagram of parts of a spring winding machine
- Figure 2 is a representation of measured values of a
- Figure 3 shows a control function for a converter
- FIG. 1 shows schematically a schematic diagram with parts of a spring winding machine 1, which are important for the invention.
- the spring coiling machine 1 comprises an electronic machine control, called controller 3 for short, a wire feed device 5 with two wire feed rollers 5a, 5b, a wire forming system 7 with a feed part 9 comprising two support rollers 9a, 9b or a feed part (not shown) and at least one converter 11.
- Die Controller 3 may include one or more components.
- the controller 3 can comprise a conventional machine controller and a PC or industrial computer connected to it.
- a bender 11a for deflecting a spring wire, abbreviated to wire 13, in the radial direction or for forming the turns of a screw or Mattress spring and a deflector 11b for deflecting the wire 13 in the axial direction or for shaping the pitch of the spring 15 are provided.
- the direction of conveyance of the wire 13 is indicated by an arrow P.
- the position and / or position of the bender 11a and the deflector 11b can be set and adjusted via actuators, for example via actuating, stepping or servo motors with or without a gear or via linear motors, which can include, for example, piezoelectric translators or electromotive or pneumatically driven spindles controllable.
- the means 11, 11a, 11b for deforming the wire 13 into a spring 15 can be adjusted, controlled or regulated by the controller 3 before and / or after and / or during the manufacture of a spring 15, depending on the configuration of the spring winding machine 1.
- the processing cycle or the control intervals for updating the position or location of the transducers 11 are preferably short and are, for example, in the range from a few milliseconds to approximately 100 ms.
- the controller 3 comprises means for acquiring input or measurement variables, for example a user interface 17 with a screen display 19 and a keyboard 21 and / or a device interface 23 for connecting measurement devices 25 and / or programming or data reading devices, such as those used for input of setpoints or default functions for controlling the converter 11 are required.
- a first, with the controller 3 Connected measuring device 25a for detecting wire properties comprises a measuring sensor 27 which is arranged upstream of the wire-forming system 7 in such a way that it can detect wire properties before the wire 13 is formed into a spring 15.
- the measuring sensor 27 can be designed to detect a wide variety of material parameters or properties of the wire 13 using any measuring method.
- a plurality of measuring sensors 27 can also be used to detect such measured quantities.
- an optical CCD sensor can measure the dimensions and / or surface structure of the wire 13 and a temperature sensor can detect its temperature and a coil can detect eddy currents or impedances.
- the first measuring device 25a preferably comprises an eddy current measuring device, such as is offered by the company IBG Prufcoputer GmbH in Germany under the brand name eddyliner® and the type designation P or Px. Devices of this type are generally used in the area of material testing and quality assurance.
- the device comprises an evaluation unit 29 and as a measuring sensor 27 a coil connected to it.
- a further coil with a piece of reference wire 13a can be connected to the evaluation unit 29 as a reference sensor 31.
- the evaluation unit 29 controls the measuring sensor 27 in succession with a sequence of several different frequencies in the range from approximately 5 Hz to approximately 300 kHz.
- the control is preferably carried out with a sinusoidal signal.
- the control signal can also be a superimposition of various sinusoidal signals.
- the control can take place continuously or in the form of pulse packets.
- the evaluation unit 29 determines, for example, from the damping behavior of the signals and / or from other measurement variables that can be influenced by these signals at several or all measurement frequencies fj .
- the scale on the ordinate indicates normalized values with respect to a reference value of the impedance.
- the real and imaginary parts of the determined impedance values assume characteristic values for certain measuring frequencies f x and for the wires labeled WA, WB, WC and WD 13. These values correspond to a fingerprint of the respective wire 13, which can be determined by different properties such as chemical composition, structure of the structure, internal mechanical stresses, surface treatment, electrical conductivity, permeability, temperature, outside diameter, shape of the cross-sectional area, etc.
- the wire 13 When the wire 13 is formed into a spring 15, such wire properties, with the transducer 11 being set unchanged, can lead to the fact that the actual properties deviate from the desired target properties of the spring 15.
- the inside or outside diameter of a helical spring can be too small or too large and / or the pitch of the spring 15 can deviate from the desired spring pitch.
- the spring 15 in shape and form Corresponds to the default values, but has a spring constant that deviates from the nominal value.
- Such deviations can be determined manually by a person, for example by visual control and / or by measuring. A person can then instruct the controller 3 via the user interface 17 to adapt the control of the transducers 11 in such a way that the springs 15 subsequently produced again have the desired properties.
- the adjustment or correction can be based on empirically determined data.
- Figure 3 shows a possible control function for the bender 11a in the manufacture of a mattress spring.
- the horizontal direction X corresponds to the feed length of the wire 13 during the spring production.
- the deflection or position or position of the bender 11a is indicated in the vertical direction Y.
- the scaling of the two coordinate directions is in each case standardized in relation to the maximum possible coordinate values, so that the possible value range of each coordinate extends from zero to one.
- the control curve marked with Ki corresponds. the ideal control function for the bender 11a for a real reference wire.
- the controller 3 can have stored such a control curve in a memory (not shown) for each type of spring to be produced.
- the control curve can, for example, by parameters of a polynomial function or by Fourier coefficients or alternatively, it can be stored as a look-up table, the corresponding deflection values being stored for, for example, one hundred support points distributed uniformly over the entire wire length.
- the controller 3 can again produce springs 15 with the desired properties by means of an adapted control function K 2 (shown by a broken line in FIG. 3).
- an adjustment of the control function can take place, for example, by multiplying the control values stored in the table by a correction factor and / or by adding or subtracting a correction value.
- different corrections can also be made for the values at individual support points or for groups of support points.
- control values can also be adapted in such a way that non-geometric spring properties such as the spring constant or, in the case of progressive springs, a corresponding function with different wire properties are retained, in which case the Shape of the springs 15, for example their spring pitch can vary.
- deviations from spring properties can also be detected automatically with a second measuring device 25b with suitable test sensors 33.
- the outer diameter of an end ring and / or the inner diameter of the narrowest turn and / or the spring pitch can be captured with a camera-based image processing system (not shown).
- the controller 3 can automatically adjust or correct the control function Ki or the control values at the individual support points on the basis of the measured variables of the second measuring device 25b as soon as these measured variables lie outside a tolerance range specified by the controller 3.
- the control function Ki can be adapted by means of processing instructions which are predetermined in the controller 3.
- the controller 3 further comprises a monitoring device (not shown) or an algorithm for determining correlations between a) the control functions and / or corrections of these control functions and / or spring properties detected by the test sensors 33 and / or deviations of these spring properties from the target properties and b) that detected by the measuring sensors 27
- the algorithm can delay between the
- control 3 starts automatically or alternatively, on the instruction of an operator
- the controller 3 stores the values determined by the first measuring device 25a as data records, provided that the
- Control function Ki for the corresponding spring type.
- This control function Ki is a lookup table with e.g. a hundred evenly across the to produce the
- Spring 15 required wire length distributed support points also stored in the memory of the controller 3. The values stored at the support points correspond to the
- the controller 3 can calculate and save a first reference data set with the mean values or the median from the previously stored measured value data sets. Alternatively, the controller 3 can also directly store the measured values, which are preferably filtered and free of stochastic interference.
- the first reference data record accordingly reflects a constellation of values of the first measuring device 25a, in which no correction of the control function Ki is required.
- controller 3 can automatically or upon manual request form further reference data sets, e.g. if one of the following criteria is met:
- One or more measurement variables of the first measuring device 25a differ significantly from the values contained in the previously stored reference data records
- the controller 3 determines on the basis of changes in the measured variables of the second measuring device 25b that the spring properties differ significantly from the Setpoints deviate, which are also stored in a storage medium of the controller 3
- the second and each further reference data record reflects a constellation of values of the first measuring device 25a, in which a correction of the control function Ki or another control function K 2 / K 3 etc. is necessary in order to be able to produce springs 15 with the desired properties.
- a first or further reference data set which can include, for example, the real and imaginary parts of the impedance of the wire 13 at one or more frequencies
- the controller 3 changes from the training mode to an operating mode in which no further determination of reference data sets takes place.
- the controller 3 now starts a comparison algorithm which relates the wire properties detected by the measurement sensors 27 and stored as reference data sets and the corrections made to the original control function Ki, for example by means of multiple regression or neural networks, and searches for correlations between these sizes.
- linear and non-linear functions of the measurement quantities or the data stored in the reference data sets are also taken into account.
- the controller 3 can limit the number of measured variables taken into account or the corresponding data in the stored data records such that only those parameters are taken into account that have a significant contribution to the correlation function.
- the controller 3 changes the control of the converters 11 in such a way that, in addition to the stored original control function Ki, the measurement values of the measurement sensors 27 and the associated correction values or the correlation function for controlling the converter 11 are taken into account.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH8272003 | 2003-05-13 | ||
PCT/CH2004/000284 WO2004101193A1 (en) | 2003-05-13 | 2004-05-10 | Spring winding machine and method for controlling a spring winding machine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1622732A1 true EP1622732A1 (en) | 2006-02-08 |
EP1622732B1 EP1622732B1 (en) | 2012-11-07 |
Family
ID=33438094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04731869A Not-in-force EP1622732B1 (en) | 2003-05-13 | 2004-05-10 | Spring winding machine and method for controlling a spring winding machine |
Country Status (4)
Country | Link |
---|---|
US (1) | US7458243B2 (en) |
EP (1) | EP1622732B1 (en) |
CN (1) | CN100372625C (en) |
WO (1) | WO2004101193A1 (en) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112006003234B4 (en) * | 2005-11-29 | 2011-06-30 | POSCO, Kyungsangbuk | Wire guide of the air-controlled type |
CN100404160C (en) * | 2006-07-21 | 2008-07-23 | 黄金堂 | Full function spring press |
AT505743B1 (en) * | 2007-03-30 | 2009-07-15 | Trumpf Maschinen Austria Gmbh | METHOD FOR DETERMINING AN ADJUSTMENT PARAMETER VALUE OF A BENDING PRESSURE |
ITRM20080078A1 (en) * | 2008-02-12 | 2009-08-13 | Cml Intarnational S P A | METHOD OF VERIFICATION AND COMMAND TO CURVE IN AN CONTINUOUS WAY A PIECE EXTENDED ACCORDING TO VARIABLE CURCATORS SPOKES AND MACHINE SO COMMANDED |
DE102010014385B4 (en) * | 2010-04-06 | 2011-12-08 | Wafios Ag | Method and device for producing coil springs by spring winches, and spring coiling machine |
JP5756609B2 (en) * | 2010-07-30 | 2015-07-29 | 日本発條株式会社 | Coil spring manufacturing equipment |
CN103143645B (en) * | 2013-03-20 | 2014-12-10 | 沈阳飞机工业(集团)有限公司 | Manufacturing tooling of cloud-shaped torsion spring |
JP5777184B2 (en) * | 2014-02-14 | 2015-09-09 | 旭精機工業株式会社 | Forming machine |
KR101419698B1 (en) * | 2014-03-25 | 2014-07-21 | 대원강업 주식회사 | hot formed coiling machine |
JP6420690B2 (en) * | 2015-02-26 | 2018-11-07 | 日本発條株式会社 | Coiling machine and coil spring manufacturing method |
US20190039118A1 (en) * | 2016-02-03 | 2019-02-07 | Spühl Gmbh | Coil Spring Winding Apparatus and Method of Winding A Coil Spring |
FR3050266B1 (en) * | 2016-04-15 | 2021-02-12 | Somfy Sas | PROCESS FOR CHECKING THE CONFORMITY OF A SPRING, PROCESS FOR MANUFACTURING SUCH A SPRING AND SPRING THUS CHECKING |
TWI654039B (en) | 2018-04-27 | 2019-03-21 | 展望系統股份有限公司 | Spring producing system |
DE102020209068A1 (en) * | 2020-07-20 | 2022-01-20 | Wafios Aktiengesellschaft | Process and spring coiling machine for the production of helical springs |
Family Cites Families (13)
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GB2137344A (en) * | 1983-03-16 | 1984-10-03 | Standard Telephones Cables Ltd | Flaw protection in wire drawing |
DE3804913A1 (en) * | 1987-02-20 | 1988-09-01 | Itaya Seisakusho | DEVICE AND METHOD FOR PRODUCING SPRINGS |
CN2039238U (en) * | 1988-06-02 | 1989-06-14 | 陕西省宝鸡市标准件弹簧厂 | Forming machine for spring washer |
JPH05115936A (en) * | 1991-10-25 | 1993-05-14 | Chuo Spring Co Ltd | Coiling method for wire rod for manufacturing coil spring |
JP3172221B2 (en) * | 1991-11-18 | 2001-06-04 | 株式会社東京コイリングマシン製作所 | Manufacturing method of coil spring |
US5477715A (en) * | 1992-04-08 | 1995-12-26 | Reell Precision Manufacturing Corporation | Adaptive spring winding device and method |
US5470319A (en) * | 1994-06-20 | 1995-11-28 | Critical Device Corporation | Needleless injection site |
DE4443503A1 (en) * | 1994-12-07 | 1996-06-13 | Uwe Dr Ing Otzen | Mfr. of helical springs by automatic spring winding machine |
US5865051A (en) * | 1994-12-07 | 1999-02-02 | Wafios Maschinenfabrik Gmbh & Co. Kommanditgesellschaft | Procedure and apparatus for the optimized manufacture of coil springs on automatic spring winding machines |
DE19604408C1 (en) * | 1996-02-07 | 1997-05-28 | Allevard Federn Gmbh | Spring screw manufacturing method |
JP2812433B2 (en) * | 1996-08-23 | 1998-10-22 | 株式会社板屋製作所 | Spring manufacturing equipment |
US5875664A (en) * | 1997-12-23 | 1999-03-02 | L&P Property Management Company | Programmable servo-motor quality controlled continuous multiple coil spring forming method and apparatus |
CN2360188Y (en) * | 1998-09-27 | 2000-01-26 | 金苗兴 | Spring coiling machine |
-
2004
- 2004-05-10 CN CNB2004800127098A patent/CN100372625C/en not_active Expired - Fee Related
- 2004-05-10 US US10/556,372 patent/US7458243B2/en not_active Expired - Fee Related
- 2004-05-10 WO PCT/CH2004/000284 patent/WO2004101193A1/en active Application Filing
- 2004-05-10 EP EP04731869A patent/EP1622732B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2004101193A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1787889A (en) | 2006-06-14 |
WO2004101193A1 (en) | 2004-11-25 |
CN100372625C (en) | 2008-03-05 |
US20060230803A1 (en) | 2006-10-19 |
US7458243B2 (en) | 2008-12-02 |
EP1622732B1 (en) | 2012-11-07 |
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