EP2828017B1 - Verfahren und vorrichtung zur herstellung von schraubenfedern durch federwinden - Google Patents

Verfahren und vorrichtung zur herstellung von schraubenfedern durch federwinden Download PDF

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Publication number
EP2828017B1
EP2828017B1 EP13707881.2A EP13707881A EP2828017B1 EP 2828017 B1 EP2828017 B1 EP 2828017B1 EP 13707881 A EP13707881 A EP 13707881A EP 2828017 B1 EP2828017 B1 EP 2828017B1
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Prior art keywords
spring
wire
measurement
time
measurement time
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EP13707881.2A
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German (de)
English (en)
French (fr)
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EP2828017A1 (de
Inventor
Claus Denkinger
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Wafios AG
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Wafios AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F11/00—Cutting wire
    • B21F11/005—Cutting wire springs
    • 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 method for producing coil springs by spring winds by means of a numerically controlled spring coiling machine according to the preamble of claim 1 and to a suitable for performing the method spring coiling machine according to the preamble of claim. 6
  • Coil springs are machine elements that are required in numerous applications in large numbers and different designs. Coil springs, which are also referred to as twisted torsion springs, are usually made of spring wire and designed depending on the load in use as tension springs or compression springs. Compression springs, in particular suspension springs, are needed for example in large quantities in the automotive industry.
  • the spring diameter is constant for cylindrical coil springs over the length of the springs, but it may also vary over the length, e.g. with conical or barrel-shaped coil springs. Also the total length of the (unloaded) spring can vary widely for different applications.
  • Coil springs are nowadays commonly manufactured by spring winches using numerically controlled spring coiling machines.
  • a wire (spring wire) is supplied under the control of an NC control program by means of a feeder a forming device of the spring coiling machine and formed by means of tools of the forming device to form a coil spring.
  • one or more wind pins which can be adjusted with respect to their position are included in the tools and can be modified if necessary the diameter of spring coils and one or more pitch tools that determine the local pitch of the spring coils at each stage of the manufacturing process.
  • a finished coil spring is cut off from the supplied wire under the control of the NC control program by a cutter.
  • Spring wind machines are generally intended to produce many springs with a specific spring geometry (nominal geometry) within very narrow tolerances at high unit output.
  • functionally important geometry parameters u.a. the total length of the finished coil spring in the unloaded state. Through the total length u.a. the installation dimensions of the spring and the spring force determined.
  • a spring coiling machine can be designed so that the wire is fed continuously without interruption and a cutting device with a rotating cut is used. Then the wire feed must not be interrupted even for the cut.
  • the DE 103 45 445 B4 shows a spring coiling machine having an integrated measuring system with a video camera, which is directed to that area of the spring coiling machine in which the formation of the spring begins.
  • a connected to the video camera image processing system with appropriate evaluation algorithms should allow to check the diameter, length and pitch of the spring during manufacture and it should be possible to change these spring geometry parameters by feedback to the motorized machining tools during manufacture. After completion, the finished spring is separated from the wire with a vertical cut.
  • the DE 10 2010 014 385 A1 The applicant describes a regulated spring wind method and a suitable spring coiling machine.
  • a desired desired geometry of the helical spring and an NC control program suitable for generating the desired geometry are defined.
  • the actual position of a selected structural element of the helical spring is measured relative to a preferably machine-fixed reference element in a measuring range which has a finite distance from the shaping device in the longitudinal direction of the helical spring. The distance is smaller than the total length of the finished coil spring.
  • the measured actual position is compared with a target position of the structural element for the measurement time to determine a current position difference representing the difference of the actual position to the target position at the measurement time.
  • a pitch tool of the forming device is controlled in dependence on the position difference. After completion of the spring this is separated with a vertical cut from the wire.
  • the process can include series made by long coil springs with very little dispersion of the overall length.
  • Regulated automated spring wind methods require exact measurement results in order to achieve the desired quality of the finished springs.
  • the generic DE 10 2010 014 386 A1 describes a method for producing coil springs by spring-winding by means of a numerically controlled spring coiling machine, wherein a wire fed under the control of an NC control program by a feeder of a forming device of the spring coiling machine, converted by means of tools of the forming device into a coil spring and then a finished coil spring is separated by means of a cutting device of the supplied wire. At least one measurement time during the forming operation, a measurement is performed in the coil spring. The wire is fed to the forming device continuously and a measurement on the coil spring is carried out while the feed is running.
  • the DE 10 2008 002 214 A1 describes, inter alia, an apparatus for making a helical part by feeding a wire to a straightening tool and pressing the wire against the straightening tool to force-wind the wire.
  • the apparatus has, among others, a feed roller for feeding the wire to the straightening tool, a wire feed motor for rotatably driving the feed roller, and a grindstone tool unit which rotatably and movably supports a disc-shaped grindstone to cut the wire by rotating the disc-shaped grindstone.
  • a control unit for controlling the wire feed motor and the grindstone tool unit moves the disc-shaped grindstone on a plane leading to a winding growth direction of the helical one Is substantially perpendicular to cut the wire substantially perpendicular to the winding growth direction.
  • the wire is fed continuously to the former and a measurement on the coil spring is made while the feed is in progress.
  • the wire feed is thus not interrupted for the measurement, so that the wire moves during the measurement.
  • the finished coil spring is separated by a rotating flying cut from the supplied wire.
  • rotating flying cut here means that the cutting tool when cutting a rotating movement and that the wire moves during the cut, or that the wire feed for the cut is not interrupted. With this type of cut it is therefore not necessary to interrupt the wire feed for the cut.
  • a measuring device for performing a measurement on the coil spring is provided and it is further provided that the cutting device has a rotating drivable cutting tool at the end of the forming operation, the finished coil spring by a rotating can separate flying cut to the supplied wire.
  • a downstream sorting device can be precisely controlled on the basis of the measurement results in order to sort out bad parts lying outside the tolerances. Possibly On the basis of the measurement, a control intervention in the forming process can take place.
  • the wire is fed at a constant feed rate. It is also possible that the feed rate varies continuously between larger and smaller values, but without being reduced to zero.
  • a desired desired geometry of the helical springs to be produced and a corresponding NC control program suitable for generating this desired geometry are defined.
  • the sequence of coordinated working movements of the machine axes of the spring coiling machine is set, which are to go through in the manufacture of a spring.
  • the coordinated working movements are then repeated cyclically.
  • control devices in embodiments according to the invention spring coil machines have a programmable logic controller (PLC), which can be programmed digitally. To generate recurring coordinated work movements, this control is cycle-oriented.
  • PLC programmable logic controller
  • a programmable controller has inputs, outputs and an operating system, also referred to as firmware.
  • Input cards are connected to the inputs via which, for example, sensor signals are read in via the state of the machine. Actuators at the outputs of the controller control the machine.
  • the user program can be loaded via an interface. The user program cyclically determines the switching of the outputs depending on the inputs after a certain clock cycle.
  • the operating system informs the user program cyclically about the current positions of encoders, eg sensors. In this way, the user program switches the outputs in such a way that the programmed function sequence results.
  • the cycle time of typical deratiger controls is today in the range of one hundredth of a second, ie in the range of several milliseconds. According to the observations of the inventors, it is generally not sufficient to synchronize trigger signals for measurements with this clock of the controller. In this case, it may be that the actual measurement time deviates more or less from the program time at which the measurement should actually be performed. Therefore, according to the invention, the measurement time is synchronized with the NC-controlled movements of devices of the spring coiling machine with a temporal accuracy which is greater than a cycle time of the control of the spring coiling machine. According to the invention, the temporal accuracy of the determination of the measuring time is less than 10 ⁇ s. The accuracy can be in the range of 1 ⁇ s.
  • the temporal accuracy of the determination of the time of measurement can be at least one order of magnitude (at least factor 10), preferably at least two orders of magnitude (at least factor 100), more accurate than the cycle time.
  • Genicity in the range of 1 ⁇ s is more than three orders of magnitude (more than a factor of 1000) more accurate than a cycle time of several milliseconds of the underlying control. This makes it possible to generate a trigger signal for the measuring device at a measuring time, which can be very precise at almost any point between the clocks of a programmable logic controller.
  • this timely precise control of the measuring device is achieved in that the measuring time based on cycle limits or by the clock of the control by a time stamp method over a (individually set or determinable for each measurement time) time interval between a cycle limit of the controller and the measurement time becomes.
  • the controller may include an instruction that after the beginning of a particular cycle of the underlying controller, a certain time interval, which is shorter than the cycle time, still elapses should before the trigger signal or the trigger for the measuring device is generated.
  • the timing precision of the definition of the measurement time is independent of the cycle times of the underlying controller.
  • This procedure is particularly advantageous in the temporal coordination of a measurement with the separation of a finished spring from the supplied wire. If, for example, the total length of the finished spring is to be measured, there is a risk, if the measurement is too early, that the spring is not completely finished at the time of measurement and, accordingly, the finished spring has a significantly greater overall length than the measurement result indicates. On the other hand, if the measuring time is too late, for example at a point in time at which the cut has already begun, then a displacement of the spring that has just been separated may already have taken place, so that a measurement can no longer be carried out with the required accuracy.
  • a trigger signal is generated for the measuring device at a measurement instant which is immediately prior to an engagement of the cutting tool in the wire.
  • the geometrical distance between the wire and the cutting tool moving toward the wire may, for example, be in the range of one to three times the wire diameter.
  • the time interval between the measurement time and the first contact contact between the wire and the cutting tool should preferably be in the range of a few microseconds, for example 10 ⁇ s or less. The time interval should be as equal as possible for each cutting process in order to obtain reproducible spring geometries.
  • the measurement is preferably carried out without contact, in particular with optical measuring means.
  • a laser measuring system could be used be used.
  • a camera with a two-dimensional image field is used for the measurement, and the measurement area is placed in the image field of the camera.
  • Camera-based measurement systems with powerful image processing hardware and software are commercially available and can be used for this purpose.
  • a desired desired geometry of the helical spring to be produced and a corresponding NC control program suitable for generating this desired geometry are defined.
  • the sequence of coordinated working movements of the machine axes of the spring coiling machine is set, which are to go through in the manufacture of a spring.
  • the temporal position of the at least one measuring time point is determined in relation to the phases of the working movements or to the program time function given thereby.
  • program time function refers to a function that refers to specific locations within the NC control program.
  • the achievement of a specific NC block corresponds to a specific program time or a point in time within the program sequence.
  • a program time corresponds to a sequence position in the sequential sequence of program steps during program execution.
  • a trigger signal (trigger) is required to control an image acquisition by a camera in a specific phase of the program execution, then this trigger signal can be triggered by a program line present at the appropriate place. This signal is then output by the PLC. This can lead to measurement errors. The present application teaches how such measurement errors can be avoided or reduced to a tolerable level.
  • Trigger signals are directly linked in the program with certain positions of the machine axes, eg with the machine axis of the wire feed and / or with the machine axis for the position of the pitch tool.
  • a time in a program time function thus corresponds to a location in the movement curve of one or more machine axes.
  • the program time function results in times (program times) within an NC program that are synchronous with the progress of the spring production.
  • the program time function is also a path function with respect to the movements of machine axes.
  • a program time function also corresponds to a path function of the wire feed.
  • the invention also relates to a numerically controlled spring coiling machine, which is particularly configured for carrying out the method. It has a feed device for feeding wire to a forming device and a forming device with at least one wind tool, which essentially determines the diameter of the coil spring at a predeterminable position, and at least one pitch tool whose engagement with the developing helical spring determines the local pitch of the helical spring , Further, a cutting device for cutting a finished coil spring from the supplied wire after completion of a forming operation, a measuring device for making a measurement on the coil spring during the forming operation, and a controller for controlling the feeder, the forming device, the measuring device and the cutting device based on a NC control program provided.
  • the feeder is configured for a continuous supply of the wire so that the wire of the former is continuously, i. is fed without interruption for the measurement and a measurement can be performed on the coil spring while the feed is running. Also for the cut no interruption of Zufuhhik is necessary.
  • the cutting device has a rotating drivable cutting tool and the spring coiling machine is configured such that the finished coil spring can be separated by a rotiende flying cut from the supplied wire.
  • the spring coiling machine is configured to carry out the method according to the invention.
  • the control device is configured such that a trigger signal for the measuring device is generated at a measuring instant which is immediately before engagement of the cutting tool in the wire. This allows exact measurement results, in particular with regard to the measured spring length.
  • the measuring time is predetermined with a time accuracy which is substantially greater than the accuracy that would be possible if the measuring times were exclusively linked to the cycle time.
  • the temporal accuracy of the determination of the measuring time is less than 10 ⁇ s and / or is at least one order of magnitude (at least a factor of 10) more accurate than the cycle time.
  • FIG. 1 shows some structural elements of a CNC coil winding machine 100 according to an embodiment of the invention.
  • FIG. 2 shows details of in Fig. 1 not shown mounting assemblies. This includes an optional spring guide device 210 with an upwardly open angle plate 221, which can support longer springs.
  • the spring coiling machine 100 has a feed device 110 equipped with feed rollers 112, which can feed successive wire sections of a wire feed wire 115 with a numerically controlled feed rate profile into the area of a forming device 120.
  • the wire is guided on the exit side through a wire guide 116.
  • the feeder can also be referred to as a feeder, according to the wire feed can also be referred to as wire feed and the feed rate as the feed speed.
  • the wire is converted into a helical spring by means of numerically controlled tools of the forming device.
  • the tools include two angularly offset wind pins 122, 124 that are radially aligned with the central axis 118 and the location of the desired spring axis, respectively, and are designed to determine the diameter of the coil spring.
  • the position of the wind pins can be changed to the basic setting for the spring diameter when setting along the lines shown in phantom and in the horizontal direction (parallel to the feed direction of the feeder 110) to set up the machine for different spring diameters. These movements can also be carried out with the aid of suitable electric drives under the control of the numerical control.
  • a pitch tool 130 has a tip oriented substantially perpendicular to the spring axis which engages the turns of the developing spring.
  • the pitch tool is moved by means of a numerically controlled adjustment of the corresponding machine axis parallel to the axis 118 of the developing spring (ie perpendicular to the plane of the drawing).
  • the wire fed during spring production is moved by the pitch tool according to the position of the pitch tool in the direction parallel to the spring axis pushed by the position of the pitch tool, the local slope of the spring is determined in the appropriate section. Gradient changes are effected by axis-parallel process of the pitch tool during spring production.
  • the forming device has another, vertically downwardly deliverable incline tool 140 with a wedge-shaped tool tip, which is introduced when using this pitch tool between adjacent turns.
  • the adjustment movements of this pitch tool are perpendicular to the axis 118. This pitch tool is not engaged in the manufacturing process shown.
  • a numerically controllable cutting device 150 is mounted with a cutting tool 152 which, after completion of a forming operation, separates the manufactured coil spring from the supplied wire supply with a rotating working movement.
  • a mandrel 155 cutting mandrel
  • a cutting mandrel which is located inside the developing spring and has an oblique cutting edge 156 which cooperates during separation with the cutting tool.
  • the spring coiling machine operates with a continuous wire feed or wire feed in conjunction with a flying rotating cut.
  • the cutting device is driven, driven by a rotary machine axis, into a rotating working movement, which runs in a plane perpendicular to the spring axis 118 and into which Fig. 1 and 3 is indicated by rotating arrows.
  • the circulation can be circular or elliptical, for example.
  • the direction of rotation (clockwise or counterclockwise) depends on the direction of the wind. It can be wound both right and left. In the example case
  • the cutting tool rotates clockwise.
  • the rotational speed is usually non-uniform.
  • cutting tool 152 cuts the wire 115 when it approaches the lower reversal point of the rotating working movement.
  • the top of the mandrel 155 of the cutting device serves as a counter element for the moving cutting tool and provides an oblique cutting edge, which together with the correspondingly shaped cutting contour of the cutting tool enables a clean cut through the continuously shaped wire.
  • Fig. 4 The basic principle of this operating mode (continuous wire feed with rotating flying cut) is in Fig. 4 again schematically represented by the same reference numerals.
  • the wire 115 is fed or fed continuously at a constant or varying finite feed rate V z .
  • V z finite feed rate
  • the wire feed or the supply device is running constantly, the wire supply 157, which is held on a reel, for example, need not be constantly accelerated and decelerated.
  • This also applies to the drives of the feeder and the tools.
  • the energy requirement per spring is reduced in comparison with methods with a standing cut, in which the wire feed for the cutting process must be stopped.
  • there is no jerky pull on the wire and no stick-slip effect whereby the quality of the springs produced can be significantly increased compared to methods with a standing cut.
  • the spring coiling machine is set up to measure spring data such as the diameter and / or length of a spring after production and the finished springs depending on the result of the measurement automatically sorted into good parts (spring geometry within the tolerances) and bad parts (spring geometry outside the tolerances) and, if necessary, into further categories.
  • spring data such as the diameter and / or length of a spring after production and the finished springs depending on the result of the measurement automatically sorted into good parts (spring geometry within the tolerances) and bad parts (spring geometry outside the tolerances) and, if necessary, into further categories.
  • springs are measured directly after the spring winds shortly before cutting.
  • the machine is stopped briefly to allow a sufficiently accurate measurement.
  • a stopped wire is cut with a vertical cut by means of a linearly movable cutting tool.
  • the spring coiling machine is equipped with a camera-based optical measuring system for the non-contact, real-time acquisition of data on the geometry of a currently manufactured spring.
  • the measuring system has a CCD video camera 250, which can provide in the example, with a resolution of 640 x 480 pixels (pixels) up to 90 frames per second (frames per second) via an interface to a connected image processing system.
  • the image acquisition of the individual images is triggered in each case via trigger signals (trigger) of the controller. This determines the measurement times.
  • the software for image processing is housed in a program module, which cooperates with the control device 180 of the spring coiling machine or is integrated in this.
  • the camera is mounted on a torsion-resistant support rail 255, the side of the Switzerlandschreib adopted in the region of the guide rollers of the feeder on the machine frame of the spring coiling machine is fixed so that the longitudinal axis of the support rail is parallel to the machine axis 118.
  • the measuring camera is longitudinally displaceable on the carrier rail and can be fixed to arbitrary longitudinal positions. A stepless adjustment in height is also possible.
  • the optical axis of the camera optics is in the example approximately at the height of the central axis of the coil spring (i.e., at the level of the axis 118) arranged and perpendicular to this axis.
  • a second camera 260 is intended for detection of the free spring end 204 and is therefore positioned on the carrier rail such that the free spring end runs into the detection range of the second camera in the final phase of the production of the helical spring.
  • a lighting device is mounted at the level of the axis 118, which flashes at the measurement times predetermined by the control in response to trigger signals (trigger) of the control and enables measurement in transmitted light.
  • a reflected-light illumination device may be provided in order to improve the visibility of interesting details of the spring for the measurement.
  • the machine axes of the CNC machine belonging to the tools are controlled by a computer numerical control device 180, which has memory devices in which the control software resides, to which i.a. an NC control program for the working movements of the machine axes heard.
  • This control device also controls the components of the measuring system.
  • the forming tools When setting up the spring coiling machine, the forming tools are brought into their respective basic positions.
  • the NC control program is created or loaded, which controls the positioning movements controls the tools during the manufacturing process.
  • the geometry input is made in the spring coiling machine by an operator on the display and control unit 170, which is connected to the control device 180.
  • a programmable logic controller (PLC) is realized, which works cycle-oriented.
  • the drive positions of the machine axes are precalculated by the CNC control.
  • the programmable logic controller is responsible for the outputs and inputs and operates after a fixed time frame or after a fixed cycle. Typical cycle times are often in the range of one hundredth of a second. In the example, the cycle time of the controller is 8 ms (milliseconds).
  • Fig. 5 the defined time interval of the PLC with a sequence of cycles of the same duration (cycle time ⁇ t Z eg 8 ms) is plotted on the time axis (x-axis).
  • the y-axis denotes the feed path V of the wire conveyed by the feeder. With continuous supply of wire at a constant feed rate, the oblique straight line ZU results.
  • the cutting times do not coincide with the cycle times of the PLC.
  • the production time .DELTA.t F which is required for the completion of a spring, not an integral multiple of the cycle time .DELTA.t Z.
  • the measurement time should therefore be earlier than the time of the cut.
  • the measurement time is too far before the cutting time, the spring is not yet completely finished, so that there are measurement errors, eg in the form of an incorrect value for the spring length or the end position of the spring end.
  • the measuring error MF1 is particularly large when measuring the first spring F1, since the last possible measuring time, which coincides with the cycle time of the PLC (vertical dashed line), is almost a complete cycle time before the cutting time.
  • the resulting measurement error MF6 is significantly smaller, since the cutting time is only about half a cycle time or a few milliseconds (about 3 to 4 ms) behind the immediately preceding clock time (vertical dashed line).
  • the jitter can be several milliseconds.
  • a trigger signal (trigger signal) of the controller measuring time of the measuring system is synchronized with the numerically controlled movements of the machine axes of the spring coiling machine with a temporal accuracy significantly larger is the cycle time ⁇ t Z of the control of the spring coiling machine.
  • trigger signals can be generated for the measuring system at measuring times which lie between cycle limits or between the cycles of the programmable controller, ie within one cycle.
  • the programmable controller is equipped with a special output card that can control the output for the trigger signal of the camera by means of time stamps between the PLC cycles. Suitable output cards are commercially available. For example, an output card from the field of laser technology with an accuracy of about 1 ⁇ s can be used.
  • the outputs of the PLC can also be set between the cycles.
  • the necessary control commands for the trigger signal are inserted based on the programmed spring geometry. Depending on the camera system used, they can then be adapted automatically. This makes it possible to position the trigger signal or the measurement time in the course of the spring production so accurately that the images can be taken immediately before placing the cutting blade on the wire. Targeted feedback can be used to control the tool positions
  • FIG. 3 A typical procedure of a measuring process immediately before the flying rotating cut is based on the Fig. 3 and 6 explained in more detail.
  • the rotationally driven cutting tool 152 is shown at three consecutive times immediately before and during the cutting engagement.
  • the cutting tool approaches the passing wire 115 in an accelerated motion.
  • the cutting tool is just setting on the wire, the cutting process begins.
  • the cutting tool has completely severed the wire and has reached its lower reversal point on its round trajectory.
  • Fig. 6 shows in the upper part of a speed-time diagram of the feed rate or feed speed V Z of the wire feed.
  • the speed-time diagram in the lower part figure shows the moving speed V s of the cutting tool during the continuous wire feeding.
  • the vertical dashed lines indicate in each case the times t 2 , to which the cutting tool touches down on the wire and the cut begins. It can be seen that the cutting tool does not rotate uniformly, but undergoes a cyclic movement with acceleration phases and deceleration phases, wherein the cutting tool is accelerated in the direction of wire before the cut and is retarded to a very low speed of movement after the cut.
  • the cutting tool is usually constantly in motion, although between the individual cuts, the movement speed is very low. As a result, jerk-free operation is achieved with relatively low energy consumption.
  • the time of measurement t M determined by means of the time stamp method or the associated narrow time window lies immediately before the intervention of the cutting tool in the wire, for example between the times t 1 and t 2 in Fig. 3 .
  • the full length of the finished spring is practically achieved, so far as measuring errors are reduced to a minimum.
  • the measured spring length of the actual spring length of the finished spring within the measurement accuracy correspond.
  • a very reliable sorting of the springs with regard to the criterion spring length is possible.
  • the performance of certain springs can be approximately doubled compared to conventional standing-cut systems.
  • the energy consumption per spring drops by up to 40% and the quality of the springs increases.
  • significantly lower loads on the mechanics and thus higher stability result.
  • the invention can be implemented with different measuring systems and for different measuring methods.
  • a suitable method is in the DE 10 2010 014 385 A1 the applicant described.
  • the measuring times can be determined there as described in the present application.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wire Processing (AREA)
  • Shearing Machines (AREA)
EP13707881.2A 2012-03-21 2013-03-07 Verfahren und vorrichtung zur herstellung von schraubenfedern durch federwinden Active EP2828017B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012204513A DE102012204513B3 (de) 2012-03-21 2012-03-21 Verfahren und Vorrichtung zur Herstellung von Schraubenfedern durch Federwinden
PCT/EP2013/054604 WO2013139612A1 (de) 2012-03-21 2013-03-07 Verfahren und vorrichtung zur herstellung von schraubenfedern durch federwinden

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EP2828017A1 EP2828017A1 (de) 2015-01-28
EP2828017B1 true EP2828017B1 (de) 2018-08-01

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JP (1) JP2015510841A (zh)
CN (1) CN104487186B (zh)
DE (1) DE102012204513B3 (zh)
WO (1) WO2013139612A1 (zh)

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DE102015208346B4 (de) * 2015-05-06 2017-02-23 Wafios Aktiengesellschaft Einzugseinrichtung für Umformmaschine
DE102016202796B4 (de) 2016-02-23 2017-08-31 Wafios Ag Scherenschnittsystem für Drahtverformungsmaschine sowie Drahtverformungsmaschine mit Scherenschnittsystem
CN106001322B (zh) * 2016-07-30 2018-06-29 刘国政 螺旋箍筋连续同步加工机及加工方法
CN108284175B (zh) * 2017-12-29 2019-11-08 赵龙 一种弹簧床垫加工用卷簧设备
JP6685614B2 (ja) * 2018-08-31 2020-04-22 日本ピストンリング株式会社 線材成形機及び線材成形品の製造方法
EP3922377A4 (en) * 2019-02-06 2022-10-26 NHK Spring Co., Ltd. COILING MACHINE, PROCESS FOR MAKING A COIL SPRING AND COIL SPRING
KR102251900B1 (ko) * 2019-09-24 2021-05-12 정채교 스프링성형기용 심금
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EP2828017A1 (de) 2015-01-28
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CN104487186B (zh) 2016-10-26
WO2013139612A1 (de) 2013-09-26
DE102012204513B3 (de) 2013-09-19

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