EP3921096A1 - Elektrohydraulische ziehbackensteuerung - Google Patents
Elektrohydraulische ziehbackensteuerungInfo
- Publication number
- EP3921096A1 EP3921096A1 EP20704450.4A EP20704450A EP3921096A1 EP 3921096 A1 EP3921096 A1 EP 3921096A1 EP 20704450 A EP20704450 A EP 20704450A EP 3921096 A1 EP3921096 A1 EP 3921096A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydraulic
- machine
- pulling
- jaws
- closing
- 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, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes
- B21C1/27—Carriages; Drives
- B21C1/28—Carriages; Connections of grippers thereto; Grippers
Definitions
- the invention relates to a device for controlling a drawing machine with one or more drawing carriages, each having one or more jaw closing cylinders for opening and closing corresponding jaws and being designed to grip a workpiece by closing the clamping jaws and pulling it through a forming tool.
- Drawing machines in metal processing are used to pull and transport elongated workpieces, such as tubes, bars, profiles or wires, through a forming tool, whereby the workpieces are plastically deformed.
- drawing machines have one or more drawing carriages that grip the workpiece and can transport it through the forming tool along a pulling direction.
- WO 2018/019335 A1 describes a drawing slide for a drawing machine which has two adjustable clamping jaws that can be moved relative to one another by means of a linear motor. By operating the linear motor, the workpiece to be pulled can be gripped and released using the clamping jaws.
- the translatory movement of the pulling slide is realized in that the pulling slide engages around a drive web, which rotates around a drive axis and thus defines a drive curve.
- Electronic components on the drawing carriage are subject to strong accelerations, especially at high drawing speeds, which result in high Cause the probability of failure and susceptibility to maintenance of the linear motor. Residues of lubricant and scale that remain on the drawn material also attack the linear motor and stand in the way of low-maintenance, reliable function.
- the connection of the electronic components (control and power connection) on the moving drawing carriage is prone to errors, especially at high drawing speeds.
- a main shaft has control cam disks which drive pistons in hydraulic cylinders, whereby, within a certain range of motion of the pulling slide (whose back and forth movement is also effected by the main shaft), pressure fluid pulses for actuating the clamping jaw cylinders are generated.
- the mechanical components for controlling the clamping jaw cylinders can only be adjusted manually and with a lot of work. Subsequent adaptation to changed processing conditions is difficult and can only be done statically.
- the purely mechanical control thus prevents dynamic process and product parameters from being taken into account. Furthermore, a great deal of work is required in order to carry out maintenance on the purely mechanical control.
- the components that may have to be replaced as part of maintenance work are complex to manufacture and therefore expensive.
- An object of the invention is to provide an improved device for controlling a drawing machine, in particular the Improved application flexibility and ease of maintenance of such a drawing machine.
- the device according to the invention is used to control a drawing machine.
- the drawing machine has one or more drawing carriages, each of which has one or more hydraulic clamping jaw locking cylinders for opening and closing corresponding, ie associated, clamping jaws and are designed to grip a workpiece by closing the clamping jaws and to access it in a pulling or transport direction through a forming tool pull.
- the drawing machine is preferably set up in such a way that it can be operated at different working speeds.
- the workpiece which is also referred to herein as “drawing material”, is usually an elongated object, such as a wire, pipe, profile or rod, which is drawn by means of the drawing machine through the forming tool for processing, in particular plastic deformation, of the same.
- the forming tool preferably comprises a drawing die.
- the drawing die has one or more openings of a certain shape through which the workpiece is pulled, whereby it assumes the shape and the diameter of the opening (s).
- the device according to the invention has a fly hydraulic block which is hydraulically connected to the jaw locking cylinders and is arranged to actuate the jaw locking cylinders by changing the fly hydraulic pressure applied thereto.
- the jaw locking cylinders are particularly preferably individually, that is, independently of one another, actuatable by the hydraulic block.
- the device also has a machine controller which is set up to set one or more setpoint values of the contact pressure P S oii for the drawing jaws to be determined and output to the hydraulic block. The hydraulic block can then actuate the clamping jaw locking cylinders accordingly on the basis of the setpoint values P S oii determined by the machine control.
- setpoints of the contact pressure does not necessarily mean data in a physical unit of the contact pressure, but rather includes all forms of signals that, processed by the hydraulic block, lead to the desired contact pressure of the drawing jaws.
- the machine control can transmit pressure values to be set in the clamping jaw cylinders or abstract process instructions to the hydraulic block. This applies analogously to the other setpoint values presented here.
- the device according to the invention allows dynamic control of the drawing jaws, for example on the basis of process and product parameters. An adaptation of the operation of the same - for example the opening / closing times in the work cycle, the clamping forces, etc. - to changed processing conditions is possible immediately and without considerable effort.
- the corresponding settings can be made by the machine control without manual adjustments having to be made, for example on one of the hydraulic cylinders or a plunger mechanism mentioned. Furthermore, the elimination of mechanical components reduces the maintenance effort and the maintenance costs. The drawing machine is reliable and robust. Maintenance of the system can be carried out quickly and inexpensively.
- the drawing machine preferably has a drive which is set up to move the drawing carriages translationally along the drawing direction, the machine control being designed to determine one or more setpoint values of the drawing speed V SO II for one or more of the drawing carriages output to the drive.
- the working speed of the drawing machine can be adjusted flexibly, reliably and without considerable mechanical effort.
- the synchronization of the working speed with the actuation of the clamping jaws is easily possible and also flexibly adjustable by the machine control.
- the drawing machine preferably has a main shaft that is set in rotation by the drive, the main shaft having one or more, preferably spiral, curves on the circumference, in which the drawing slides engage, so that the drawing slides translationally along the drawing direction by rotating the main shaft - and be moved around.
- the rotation of the drive can thus be converted in a mechanically reliable manner into the desired translational movement of the pulling slide.
- the movement amplitudes of the slide and speeds as a function of the translational position are determined by the shape of the curves.
- the working speed of the drawing machine can be adjusted simply by changing the rotational speed of the main shaft.
- the machine control is preferably set up to receive process parameters of the drawing machine and / or product parameters of the drawn material and to determine the setpoint values of the contact pressure P SO II and possibly the setpoint values of the drawing speed V SO II therefrom.
- Information from the unit (s) in front of and / or behind the drawing part, which includes the drawing carriage, can be taken into account.
- the process or product parameters can be obtained using sensors.
- the process parameters include, for example: at least one actual value of the contact pressure P, st of one or more of the clamping jaw locking cylinders; and / or at least one actual value of the drawing speed Vst, preferably received from the drive; and / or one or more pressures from the hydraulic block; and / or the actual value of the straightening force K, st , measured by a Measuring device of the straightening force; and / or an actual value of a drawing die position and / or drawing die adjustment X, st from an automated drawing die adjustment.
- Product parameters that can be used to determine the target values include, for example: hardness of the drawn material; and / or diameter of the drawn material.
- the machine control is preferably set up to send the setpoint values of the contact pressure P S oii for the drawing jaws electrically - by wire or wirelessly - to the hydraulic block.
- the machine control can be implemented by a computing device or data processing device with a control program that is set up to control various components of the drawing machine, in particular the clamping jaw cylinder and the drive.
- the machine control can be implemented locally by a control device or in a decentralized manner.
- the machine control can comprise several computing devices that communicate with one another via a network, for example the Internet.
- the machine control can be adapted flexibly and inexpensively, for example by means of appropriate programming, while no manual work on the mechanical components of the drawing machine, in particular on the hydraulic block, is required.
- the hydraulic block preferably has one or more hydraulic valves which are hydraulically connected to the clamping jaw closing cylinders and are set up to actuate them electrically controlled by the machine control. In this way, the drawing jaws can be dynamically controlled in a structurally compact and reliable manner.
- One or more of the hydraulic valves are preferably designed as 4/3-way valves.
- the hydraulic block preferably has one or more throttle valves which are configured to regulate the increase in the closing / opening speed of the hydraulic valves.
- the drawing machine has a drawing part with one or more drawing carriages, each of which has one or more clamping jaw closing cylinders for opening and closing corresponding clamping jaws and are designed to grip a workpiece by closing the clamping jaws and to pull it through a forming tool.
- the drawing machine also has a device for controlling the same in accordance with one of the embodiments set out above.
- FIG. 1 is a schematic side view of a drawing machine with two drawing carriages.
- FIG. 2 is a block diagram for illustrating the control of the drawing machine.
- FIG. 3 shows a hydraulic circuit diagram of the hydraulic block for actuating the clamping jaw locking cylinders of the pulling slide.
- FIG. 1 is a schematic side view of a drawing machine 1.
- the drawing machine 1 has two drawing carriages 2 and 3 which can be moved back and forth translationally, in the illustration in FIG. 1 in the left / right direction.
- the two pulling carriages 2 and 3 correspondingly engage in curves 4 and 5 which are provided in a spiral shape on the circumference of a rotatable main shaft 6.
- the main shaft 6 is set in rotation by a drive 20, and the rotation of the main shaft 6 is converted in this way into the translational movement of the drawing carriages 2 and 3.
- the movement of the slide 2 and 3 can be stabilized by guides not shown in detail.
- the pulling carriages 2 and 3 each have one or more jaw locking cylinders 7, 8 and 9 which are set up to open and close clamping jaws.
- the clamping jaws are used to grip the workpiece to be drawn (also referred to herein as "drawing material") and release it.
- the jaw locking cylinders 7, 8 and 9 located on the reciprocating pulling carriage 2 and 3 close and open at specific points of the pulling carriage strokes, a continuous forward movement can be generated on the workpiece to be pulled.
- the jaw locking cylinder 7 is a pulling forceps assigned, while the jaw locking cylinder 8 and 9 are each assigned to a pulling jaw.
- the clamping jaw cylinders 7, 8 and 9 are operated hydraulically.
- the use of a hydraulic system for power transmission has the advantage over the known pneumatics (usually compressed air) that it is possible to work with pressures far above the usual limit for compressed air and thus correspondingly larger forces can be transmitted. As a result, inaccuracies in the control caused by centrifugal forces can be better overcome. It has been shown that the liquid columns located between the control cylinders and the jaw locking cylinders 7, 8 and 9 have sufficient compressive rigidity for the application at hand.
- FIG. 2 is a block diagram to illustrate the control of the drawing machine 1.
- the electrical communication or signal transmission can be wireless or wired.
- FIG. 2 the aforementioned jaw locking cylinders 7, 8 and 9 of the two pulling carriages 2 and 3 are shown schematically.
- the pulling slides 2 and 3 form a pulling part 10.
- the jaw locking cylinders 7, 8 and 9 obtain the hydraulic pressure required for actuation from one Hydraulic block 11, which in turn is in communication with a machine controller 12.
- the machine control 12 derives from process parameters and / or product parameters that are determined from sensor data, for example, setpoint values of the contact pressure P SO II for the drawing jaws and, if necessary, setpoint values of the drawing speed V SO II for the drawing carriages 2 and 3, and transfers these accordingly to the hydraulic block 11 as well as the drive 20.
- setpoints of the contact pressure does not necessarily mean data in a physical unit of the contact pressure, but rather includes all forms of signals which, processed by the hydraulic block 11, lead to the desired contact pressure of the drawing jaws.
- the machine controller 12 can transmit pressure values that are to be set in the clamping jaw cylinders 7, 8, 9, or abstract process instructions to the hydraulic block 11. This applies analogously to the other setpoint values presented here.
- the communication i.e. the exchange of data between the hydraulic block 11 and the machine control 12 can be wireless or wired.
- a hydraulic, pneumatic or other coupling is also possible, provided that the machine control 12 can output the setpoint values of the contact pressure P SO II for the drawing jaws to the hydraulic block 11.
- the terms “communication”, “data exchange” etc. also include information transport in only one direction; That is to say, although this is preferred, it is not absolutely necessary, for example, for the hydraulic block 11 to send information, ie signals, data, etc., to the machine control 12.
- the machine control 12 includes a data processing device with a control program that is set up to control one or more components of the drawing machine, in particular the jaw locking cylinders 7, 8 and 9, which are the focus here.
- the machine control 12 can locally by a
- the machine controller 12 can comprise a plurality of computing devices that communicate with one another via a network, for example the Internet.
- a network for example the Internet.
- dynamic control of the clamping jaws can be implemented taking process and product parameters into account.
- a particularly preferred input variable for determining the setpoint values P S oii and / or V SO II for the drawn part 10 are the actual values of the contact pressure P, s t of the jaw locking cylinders 7, 8 and / or 9.
- the actual value of the drawing speed Vist can also be used as an input variable for Determination of the setpoint values P SO II and / or V SO II can be used.
- the machine control 12 can receive and take into account further input variables, for example the actual value of the straightening force st, measured by a measuring device 13.
- the machine control 12 can also send a setpoint Ksoii to a corresponding device for setting the straightening force. It should be pointed out that further parameters of the drawn workpiece, such as its straightness or surface quality, can be used as input variables of the machine control 12 to determine the corresponding setpoint values.
- the machine controller 12 can receive process parameters and / or product parameters of the undrawn drawn material, preferably one Actual value of the drawing die position and / or drawing die adjustment X, st from an automated drawing die adjustment 14.
- the machine control 12 preferably sends a setpoint value X SO II to the automated drawing die adjustment 14 for setting the drawing die position and / or drawing die adjustment.
- Possible further input variables for the machine control 12 are, for example: hardness of the drawn material; Diameter of the drawing material; Information that is transported with the coil from upstream process steps, for example from an upstream rolling mill, a decoiler or a drawing die with drawing force measurement; Information from the hydraulic block 11, for example
- FIG. 3 shows a hydraulic circuit diagram of the hydraulic block 11 for actuating the clamping jaw locking cylinders 7, 8 and 9.
- the jaw locking cylinders 7, 8 and 9 can be designed as differential cylinders (here the jaw locking cylinder 7) and / or as synchronous cylinders (here the jaw locking cylinders 8 and 9). At least one
- the piston side of the clamping jaw cylinder 7, 8 and 9 is connected to an electrically controlled hydraulic valve 11 a, 11 b and 11 c.
- the hydraulic valves 11a, 11b and 11c are preferably designed as 4/3-way valves. However, there is no restriction in this regard, provided that the circuit with the hydraulic valves 11a, 11b and 11c allows autonomous and independent actuation of the clamping jaw cylinders 7, 8 and 9.
- the hydraulic valves 11 a, 11 b and 11 c can interact with one or more throttle valves in order to meter or regulate the increase in the closing / opening speed of the hydraulic valves 11 a, 11 b and 11 c.
- the hydraulic block 11 presented above, controlled by the machine control 12, allows dynamic and individual control of the drawing jaws on the basis of process and product parameters.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102019201372.4A DE102019201372A1 (de) | 2019-02-04 | 2019-02-04 | Elektrohydraulische Ziehbackensteuerung |
| PCT/EP2020/052651 WO2020161090A1 (de) | 2019-02-04 | 2020-02-04 | Elektrohydraulische ziehbackensteuerung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3921096A1 true EP3921096A1 (de) | 2021-12-15 |
| EP3921096B1 EP3921096B1 (de) | 2023-04-05 |
Family
ID=69528789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20704450.4A Active EP3921096B1 (de) | 2019-02-04 | 2020-02-04 | Ziehmaschine mit einer elektrohydraulischen ziehbackensteuerung |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3921096B1 (de) |
| DE (1) | DE102019201372A1 (de) |
| MA (1) | MA56009A (de) |
| WO (1) | WO2020161090A1 (de) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2050208A1 (de) * | 1970-10-13 | 1972-04-20 | Demag-Hydraulik Gmbh, 4100 Duisburg | Klemmeinrichtung für Platten- oder Profilstrecker |
| DE3130820C1 (de) | 1981-08-04 | 1983-08-25 | Schumag Gmbh, 5100 Aachen | Vorrichtung zur Steuerung einer mit verschiedenen Arbeitsgeschwindigkeiten betriebenen Schlittenziehmaschine |
| DE19857781A1 (de) * | 1998-12-04 | 2000-06-08 | Mannesmann Ag | Kettenziehmaschine als Antriebsaggregat beim Walzen oder Ziehen von Stangen und Rohren |
| DE10249071B3 (de) | 2002-10-21 | 2004-01-15 | Bebeco Technologie Gmbh | Linearantrieb für die Materialzufuhr an Werkzeugmaschinen |
| US20080156060A1 (en) * | 2006-12-29 | 2008-07-03 | Po-Lin Ho | Drawing machine |
| DE102013105629A1 (de) * | 2013-05-31 | 2014-12-04 | Sandvik Materials Technology Deutschland Gmbh | Ziehmaschine zum Umformen eines länglich ausgedehnten Werkstücks |
| JP5661880B2 (ja) * | 2013-08-21 | 2015-01-28 | 昭和電工株式会社 | 引抜加工方法 |
| ITUA20164496A1 (it) * | 2016-05-31 | 2017-12-01 | Tecnopress S R L | Metodo di trafilatura lineare di filo metallico da matassa con l'impiego di viti a rullo satellite o ricircolo di sfere applicato ad una macchina trafilatrice spezzonatrice lineare |
| DE102016113686A1 (de) | 2016-07-25 | 2018-01-25 | Ejp Maschinen Gmbh | Ziehschlitten für eine Ziehmaschine |
-
2019
- 2019-02-04 DE DE102019201372.4A patent/DE102019201372A1/de active Pending
-
2020
- 2020-02-04 MA MA056009A patent/MA56009A/fr unknown
- 2020-02-04 WO PCT/EP2020/052651 patent/WO2020161090A1/de not_active Ceased
- 2020-02-04 EP EP20704450.4A patent/EP3921096B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102019201372A1 (de) | 2020-08-06 |
| MA56009A (fr) | 2022-04-06 |
| WO2020161090A1 (de) | 2020-08-13 |
| EP3921096B1 (de) | 2023-04-05 |
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