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Hydraulic high-speed press

Stepwise upgrade to an automated punching plant 

Hydraulic high-speed presses of the HDS type series from Dunkes (Kircheim/Teck) have proven themselves worldwide for many years in various punching tasks. Various add-on facilities, automation elements, and control versions facilitate the adjustment of the presses to the various customer needs. The fact that this also involves delivery of presses for which the customer provided the upgrade to an automated press plant at a later point presents the design engineers with a challenging task. They are required to design the machine with the required interfaces and connections in such a manner that the frequently only vaguely defined customer specifications can be implemented within reasonable economic parameters.


A European customer from the hardware industry has ordered to high-speed presses to punch V2A and other steel grades. Both presses needed to be prepared in such a manner that they could be converted at a later point from an initially semi-automatic operation with manual insertion of punching strips to an automatic process using coils with drum feeds. For this task, Dunkes recommended a hydraulic frame press of type HDS 315 with a nominal force of 3150 kN. With ram dimensions of 1400 x 1000 mm and an installation height of 900 mm, the installation space permits the insertion of current and planned dies. At closing and retract speeds of the ram of approximately 400 mm/s each, and a work speed at max. Press force of ³ 20 mm/s , the plant also has sufficient reserves to address the changing requirements. Off-centre loads for combined dies or progressive composite dies are reliably transferred by the 8-unit ram guide across the entire stroke length. The adjustable flat ways ensure a guide accuracy of less than 0.02 mm – an extremely advantageous impact on the service life of the tools and the accuracy of the components. another important element for the high process reliability of the press is its hydraulic / mechanical cutting shock damper. it is installed along the side of the press frame, and,  at a working travel of 15 mm, reliably damps impacts even at max. press forces. a supplemental parables port ensures the specified ram parallelism even for off-centre forces.


Depending on the settings and the tool design, up to 60 strokes /minute are possible in automatic operation. Punching scrap drops through an opening in the table bed that extends over the entire length axis with continuously adjustable insert rails. Using the side-mounted, height adjustable safety fence, the coil feed configuration over the table bed can be modified without compromising occupational accident prevention regulations. The customer therefore has yet another option to reduce setup times. Tool changes are simplified by the continuously adjustable support arms installed on the rearward facing side of the table bed. Tools are clamped with hydraulically actuated clamping rails.


The press is controlled with the Siemens S7 operating system, equipped with the Protool user interface specified by Dunkes. All press functions and planned automation facilities are displayed on the screen. A notepad is integrated into the control and permits the operator to enter additional information, as well as actual and empirical values regarding the installed tools, for the purpose of referring back to these for later use. In total, the control can describe approximately 2000 tools, and store these with associated usage data. Since all production data of the press can be saved and analysed, the productivity and performance of the plant can be verified at any time.



The two punch presses of type HDS 315 are initially operated in semi=automatic mode. Various automation facilities are planned for coil-based operation.
The cutting force damper with depth stop is installed in the side column