Fertigung mit Linearmotorpressen

Optimal manufacturing with linear motor drive presses

 

Problem

Eccentric presses make high stroke rates possible, but the load-displacement- as well as the velocity-displacement-characteristics of the plunger is pre-defined by the eccentric. At hydraulic presses, the movement and the force of the plunger can be adjusted freely, but the attainable stroke rates are substantially lower in the direct comparison to eccentric presses. Linear motor drive presses allow a free programming of movement and strength of the plunger with high stroke rates at the same time. So far there is still no systematic analysis of the optimal manufacturing with linear motor drive presses.

Figure 1: Linear motor drive press in the test field of the PtU with a pressing force of 40
Figure 1: Linear motor drive press in the test field of the PtU with a pressing force of 40

Aims

A goal of the research project is the determination of possibilities and limits of the manufacturing with linear motor drive presses. On the one hand optimal velocity-displacement- and load-displacement-characteristics of the plunger movement or -strength for different production processes are to be determined with the manufacturing by linear motor drive presses. On the other hand an optimal, adapted tool technology for manufacturing with linear motor drive presses has to be developed.

Figure 2: Software for the free programming of the plunger
Figure 2: Software for the free programming of the plunger

Approach

Development of a special control engineering for linear motor drive presses. Systematic analysis of different production processes (e.g. shear cutting, bending, deep-drawing) in terms of optimal velocity-displacement- and load-displacement-characteristics of the plunger movement or -strength. Development of simple and flexible tools, which use the possibilities of linear motor drive presses.

Figure 3: Blanked film band
Figure 3: Blanked film band

Achievements

Software for the free programming of the velocity-displacement-characteristic of the plunger movement as well as the feed axles is finished. First analyses in terms of optimal process parameters with shear cutting and bending with linear motor drive presses are accomplished. A simple and economical tool for the blanking of bends is developed and first blanking tests are accomplished successfully.

Outlook

Extension of the software for the control of linear motor drive presses for the free programming of the load-displacement-characteristic. Further process parameter analyses to shear cutting and bending as well as analyses to deep-drawing. Integration of new manufacturing methods into follow-on composite tools (e.g. milling). Development of special manufacturing technologies for linear motor drive presses.