Combined drawing machines

Combined drawing machines are primarily used to produce bars or tubes from ring material. Depending on the material (steel, brass, copper, aluminum, etc.), the systems are composed of different components. Drawing forces between 2 and 46 tons are generated to process the different dimensions. 


 Often a combined drawing machine consists of the following units: 
1. Double pay-off
 2. Coil-opening robot
 3. Prestraightener
4. Shotblasting machine
 5. Pushpointer
 6. Drawing unit
7. Profile straightener
 8. Hydraulic impact shear
 9. Tube guide
 10. 2-roll straightener
 11. Two way delivery table
 12. Chamfering machine
 13. Double easy down collection pocket
 14. Electric control

Double pay-off

The Double pay-off ensures faster feed of the starting material. 


Each of the two crowns can be hydraulically tilted and refitted during operation. The fixed base frame has a driven turning device. The carousel frame is equipped with integrated hydraulics and tilt cylinders. The control cabinet is operated either isolated or controlled by the control cabinet of the drawing machine. 


In addition to the foundation-less version shown above there is also a stronger version, with foundation, which is used in particular for large diameters.

Coil-opening robot

The Coil-opening robot provides the supply of the ring beginning into the prestraightener. 


The fixed base frame has a driven turning device. The coil-opening robot can perform any movement by the operator by means of joysticks, so that it is possible to open the beginning of the wire without manual intervention. 


In addition to the coil-opening robot shown above, there is also the classic version "RIBI".


Prestraightener

The Prestraightener ensures the optimal preparation for the subsequent processes. 


The powered horizontal feeder is important for the strong bending against the winding direction of the output ring. After the horizontal prestraightener the vertical prestraightener follows, in order to prestraighten the material on the other layer. 
Depending on the model, the rolls are set manually or by motor and are always displayed digitally. In order to enable a quick conversion of the machines, the machine has double rolls per shaft, so that a change of the rolls becomes unnecessary.

Shotblasting Machine

The shotblasting machine brings the surface of the starting material in the optimum state. 


When machining steel and steel alloys, the material is mechanically descaled before being drawn by a centrifugal shotblasting machine. This ensures that only metallically pure material gets into the drawing die of the drawing machine.  

Pushpointer

The pushpointer ensures precise feeding into the drawing unit. 


The direct impact of the ring beginning in the die can, depending on the material and dimension, replaces the sharpening. The impact force can be up to 920 kN. The simultaneous motorized adjustment of the die holder ensures the optimal alignment of the die. A large opening stroke prevents damage from the staking jaws during the drawing process.  

Drawing unit

The conventional drawing unit consists of two drawing carriages, which are driven by curves. 


This hand-over-hand drawing process, developed by SCHUMAG at the time, makes it possible to process material infinitely in a straight-ahead process. Our further developed drawing units are characterized by roll-guided drawing carriages, drawing curves made of cast steel and an electronically controlled hydraulic drawing shoe control. 
Speeds up to 150m / min and pulling forces up to 460kN are achieved.

Chaintrack drawing unit

The chaintrack drawing unit is a new generation pulling method. 


It consists of two chains that can provide higher pulling speeds than the slide carriage method. In this case, drawing speeds of up to 400 m / min can be achieved. These are particularly useful for larger batch sizes. Depending on the application, the usual speeds are between 150 and 300 m / min.

Profile straightener

The profile straightener ensures the alignment of the profile material within the drawing system in a horizontal and vertical plane.
   

The machine is equipped with 7 or 9 straightening rolls, which can be adjusted manually or by motor. Their position will always be displayed digitally.   
In order to enable a quick conversion of the machines, the profile straightener has double rollers per shaft, so that a change of the rolls becomes unnecessary.  

Hydraulic shear

The hydraulic shear separates the material on the fly, with two shanks. 


The electric three-phase servo drive enables precise speed control of the scissors carriage. The high cutting speed and the fine adjustment of the shear rifles enable optimal cutting surfaces. The cut is also possible in stand mode. A residual control can also be used. If scissors can not be used (tubes, hollow sections, etc.), a saw unit is mounted on the base instead of the scissor head.  

Tube guide

The sound-insulated tube guide box can be moved manually or with a motor. 


It ensures a close guidance of the bars to the next plant unit by means of different tube diameters. If required, the tube guide can be supplemented with a side ejector and transport units.

2-roll straightener

The 2-roll straightener ensures precise straightness and high surface quality. 
 
The height-adjustable two-roll levelers have a fixed bottom roll and an adjustable top roll. The adjustments are carried out by motor. The adjustable components are hydraulically clamped. All parameter settings are stored in the HMI system and are available when setting up the machine.

Two-way delivery table

At the end of the drawing line a two-way delivery table for mutual storage of the bars is arranged. 


Depending on the use of testing equipment in the drawing line, the bars classified as defective are ejected from the two-sided tray on the rear side. The bars found to be good are ejected on the front. The conveyor screw system ensures precise and trouble-free alignment before the bars reach the subsequent chamfering machine or the collecting table.

Chamfering machine

The bar material often requires a certain shape of the bar end for further processing.

The chamfering machine provides the end processing within the combined drawing system.  

Double easy down collection pocket

The collection pocket provides a muted collection of the material. 


The noise reduction is associated with a careful collection of the final material. By using a double easy down collection pocket, consisting of intermediate buffer and finished material pocket, it is possible to tie off and remove a bar collar during ongoing production. 

Electric control

The entire system is controlled and operated using a modern electrical control system. 

Each process parameter is recorded and, if necessary, made available to the operator, the maintenance personnel and the production management. The electrical control is based on common standard components from SIEMENS or other well-known manufacturers according to customer requirements. Internet-based remote maintenance makes it possible to provide immediate emergency assistance in the event of an incident.  

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