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
  • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels for metal extruding
  • B21C35/02—Removing or drawing-off work

Definitions

• the invention relates to a device for pulling off a strand produced in an extrusion or tube press, which has at least one driven, linearly movable slide which can be moved in the direction of pulling the strand and which can exert a tensile force on the strand.
• a device of this type is known from EP 0 300 262 B1.
• a pulling device in which the end of the strand to be pulled is fastened on a slide movably arranged on a rail. The carriage is connected to drive means so that a tensile force can be exerted on the strand.
• the tensile force is composed of different components, in particular one component being determined as a function of the extruded strand length.
• the sled (puller wagon) has a mass and is driven by a motor.
• the speed and torque of the motor can be specified by a controller.
• the invention is therefore based on the object of developing a device for pulling off a strand in such a way that the abovementioned disadvantages are overcome, in particular allowing lightweight profiles to be produced without loss of quality.
• this object is achieved in that a second slide is arranged on the first slide, said second slide being movable in the pulling direction relative to the first slide, the strand to be removed being fixable on the second slide.
• This measure divides the entire sled mass into two parts.
• the first sledge is moved as is known. Deviations from the predetermined pulling force on the strand, which can be constant or can run according to a predetermined function, are compensated for, in particular corrected, by means of a corresponding dynamic control of the second slide. Since only the relatively small mass of the second carriage has to be moved for this purpose, the system has a significantly higher dynamic range, which makes it possible to achieve the specified one Maintaining the pull-off force much more precisely.
• the pulling force exerted on the strand is always maintained according to a predetermined profile or value.
• motor means are provided for moving the second slide relative to the first slide; these motor means are preferably designed as a controllable motor, in particular as a servo motor.
• the motor means connect the first and the second slide to one another via gear means.
• the gear means are advantageously a pinion-rack system, a sprocket-chain system, a pulley-toothed belt system or a rope wheel-rope system.
• a closed control loop can be created for the movement of the second carriage
• at least one sensor is arranged on the first and / or second carriage.
• the sensor in particular can be used to measure the acceleration of the second carriage (accelerometer). This should be able to measure accelerations in an accuracy range of +/- 1 g.
• a sensor can be provided which detects the position of the second slide relative to the first slide (distance meter).
• a sensor can be provided which detects the force exerted by the second carriage on the end of the strand or on the strand (dynamometer).
• the signal measured by the sensor or the signals measured by the sensors can be fed into control and / or regulating means which, depending on the measured values determined by the sensor or depending on the sensors, influence the pulling force exerted on the strand the engine means act.
• control and / or regulating means influence the torque of the motor means.
• the device can have more than one first carriage with a respective second carriage.
• the first slides can be arranged one behind the other in the pulling direction.
• the pull-off force which is exerted on the strand can be applied precisely according to a predetermined value or a predetermined course, since the system according to the invention enables a high dynamic, which exactly follows the actual value a predetermined target value.
• Figure 1 is a schematic representation of a puller for a strand produced in an extrusion or pipe press.
• Figure 2 shows the puller in a three-dimensional view.
• Fig. 3 is a side view of the puller
• Fig. 4 the puller of Figure 3 in plan view.
• FIG. 5 the puller of FIG. 3 in a front view.
• Fig. 1 the conceptual structure of a puller 1 is shown only very schematically.
• a strand 3 is pressed, which leaves the extrusion or tube press 2 in the pull-off direction L.
• the pull-off force can be constant, but can also be built up according to a functional course over the pull-off path (cf. EP 0 300 262 B1). So that, in particular, light profiles of high quality can be produced, which require even more that the pulling force exerted by the pulling device 1 on the strand 3 is maintained as precisely as possible, the pulling device 1 has the following structure:
• a first carriage 4 is moved on a linear guide 11 in the pull-out direction L.
• a motor 12 is provided, which provides for the linear movement of the first slide 4, for example via a belt 13 and a deflection roller 14.
• a linear guide 15 is arranged on the first slide 4, on which a second slide 5 is arranged so as to be linearly displaceable in the pull-off direction L relative to the first slide 4.
• the front end 6 of the strand 3 to be drawn off is connected to the second carriage 5.
• the second carriage 5 is moved relative to the first carriage 4 by motor means 7 and transmission means 8.
• the motor means 7 is preferably a controllable synchronous servo motor.
• a pinion-rack system has proven itself as the transmission means 8.
• the puller 1 is equipped with sensors 9 which make it possible to determine process variables which have an influence on the pulling force which acts on the front end 6 of the strand 3 from the puller 1.
• sensors 9 which make it possible to determine process variables which have an influence on the pulling force which acts on the front end 6 of the strand 3 from the puller 1.
• an acceleration sensor 9 ′ which detects the acceleration of the second carriage 5.
• a displacement sensor 9 " is provided, which measures the relative position of the first slide 4 to the second slide 5.
• a force sensor 9 '" detects the pulling force exerted on the end 6 of the strand 3.
• the data recorded by the sensors 9 ', 9 "and 9'” are fed to a control or regulating means 10.
• the target pull-off force that is to be exerted on the end 6 of the strand 3 is stored in this.
• This trigger force can be variably specified as a function of the trigger path.
• the control and / or regulating means 10 acts on the motor means 7 and influences here in particular the torque which is exerted by the motor means 7.
• the first carriage 4 has a mass M, the mass of the second carriage is denoted by m.
• the mass M of the first slide 4 is at least five times, preferably at least ten times, the mass m of the second slide 5; the mass m of the second carriage 5 is thus preferably an order of magnitude smaller than the mass M of the first carriage 4.
• a high dynamic of the system is favored by the fact that the moment of inertia of the motor means 7 (servo motor) is kept small.
• the dynamic behavior of the system is positively influenced by a rigid design of the transmission means 8 in the form of a rack and pinion system.
• the frictional force between the first carriage 4 and the second carriage 5 can be kept almost proportional to the speed by an exactly working linear guide 15 and its shielding from dirt. It can therefore be mathematically compensated for by the control and / or regulating means 10.
• the inertial force is correspondingly low, so that compliance with the pulling force is much easier to regulate than in conventional systems.
• the first carriage 4 can be operated in a known manner in position control.
• the friction between the first carriage 4 and the linear guide 11 or the relatively large mass M of the first carriage 4 no longer have a negative effect on the pull-off force on the strand, since compliance with predetermined values for the pull-off force by correspondingly controlling the motor means 7 and thus the Movement of the second carriage 5 can be maintained.
• the system can in particular also be designed as a double pulling device in order to be able to pull off and guide single or multi-strand light metal profiles.
• two first carriages 4 are guided independently of one another on the linear guide 11 (see FIG. 1), so that overarching work (so-called alternating operation) is also possible with a "flying saw” or conventional operation with a first carriage 4
• Linear guide can be mounted on the side of the hall next to the runout of line 3.
• the double pull-off device can each have a track (linear guide) for the first slides, it also being possible to fasten it to a support structure to the side next to the run-out track of the strand.
• Pneumatically working profile clamping devices with clamping segments for adaptation to the profile contour can be provided on the respective second slide in order to ensure a secure gripping of the front end 6 of the strand 3.
• the pulling device with the principle explained can also be refined in such a way that a third slide (and possibly further slide) is arranged on the second slide, which, like the second slide, is driven separately.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Extrusion Of Metal (AREA)
• Extrusion Moulding Of Plastics Or The Like (AREA)
• Forwarding And Storing Of Filamentary Material (AREA)
• Electric Cable Installation (AREA)
• Ropes Or Cables (AREA)
• Containers And Plastic Fillers For Packaging (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=27797639

Family Applications (1)

Country Status (7)

Families Citing this family (6)

Family Cites Families (14)

• 2002
  • 2002-03-11 DE DE10210475A patent/DE10210475B4/de not_active Expired - Fee Related
• 2003
  • 2003-02-26 JP JP2003574356A patent/JP4076504B2/ja not_active Expired - Fee Related
  • 2003-02-26 DE DE50304137T patent/DE50304137D1/de not_active Expired - Lifetime
  • 2003-02-26 EP EP03711833A patent/EP1483067B1/fr not_active Expired - Lifetime
  • 2003-02-26 AT AT03711833T patent/ATE332196T1/de not_active IP Right Cessation
  • 2003-02-26 US US10/507,527 patent/US7125240B2/en not_active Expired - Lifetime
  • 2003-02-26 ES ES03711833T patent/ES2268339T3/es not_active Expired - Lifetime
  • 2003-02-26 WO PCT/DE2003/000599 patent/WO2003076098A1/fr not_active Ceased

Non-Patent Citations (1)

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