A SIMULATION STUDY ON THE CLOSED-LOOP CONTROL OF SCREW PRESS FORGINGS USING THE IMPACT ENERGY AS CONTROL INPUT
Journal Title: Computer Methods in Materials Science - Year 2018, Vol 18, Issue 3
Abstract
Screw presses are energy-restricted forming machines that use rotational energy stored in a flywheel for forming, which is converted into a linear movement by a threaded screw. Screw presses are widely used for forging steel, aluminum and brass. In a direct-driven electrical screw press, a reversible electric motor is mounted directly on the screw and on the press frame above the flywheel. With directly driven screw presses, the blow energy can be exactly dosed from one blow to the next. However, so far no prior work is known which uses the blow energy as a control input in a targeted manner to influence the properties of the forging. The purpose of the present work is to lay the foundations for property control through blow energy dosing during forging on screw presses. Process control becomes increasingly interesting due to ever increasing customer demands and needs for resource-efficient production. A major challenge is the variation of process parameters, e.g. temperature variations in the furnace, during transport or due to inherent uncertainty in the heat transfer to the dies and the environment. If the process conditions are changing the deviations from the planned process trajectory may lead to an insufficient die filling or undesired final properties. Forged parts require high precision considering the part geometry and material properties. During forming two mechanisms in terms of forming temperature take place: heat conduction due to contact with tools and heat dissipation due to plastic deformation. The heat transfer acts as disturbance, the impact energy can be used as control input. In this work, investigations into process control by impact energy dosing are put forward using FE (finite element) simulations.
Authors and Affiliations
MARKUS BAMBACH, BENJAMIN SYDOW, ALEXANDER SVIRIDOV
Keywords
Related Articles
- EP ID EP539135
- DOI -
- Views 127
- Downloads 0
SIMULATION OF MICROSTRUCTURE EVOLUTION DURING FORGING AND HEAT TREATMENT OF Ti-6Al-3.5Mo-1.5Zr-0.3Si TITANIUM ALLOY
The model of dynamic recrystallization of Ti-6Al-3.5Mo-1.5Zr-0.3Si has been developed based on experimental data and implemented in FEM code QForm. Kinetics of dynamic recrystallization was simulated by Johnson-Mehl-Avra...
SEDIMENTATION IN BINARY Cu-Sn SYSTEM
In the present paper the sedimentation process in binary multiphase Cu-Sn system is presented. The initial samples were produced by GoodFellow, the initial molar fraction was Cu30Sn70 respectively. Thus, the two-phase re...
USING THE HYPERGRAPH GRAMMAR FOR GENERATION OF QUASI OPTIMAL ELEMENT PARTITION TREES IN TWO DIMENSIONS
The paper presents the graph grammar model of Finite Element Method allowing for speeding up performed numerical simulations. In the presented approach, the finite element mesh operations are performed together with oper...
THE IMAGING ALGORITHM FOR THE ULTRASONIC EVALUATION OF METAL CASTINGS BY THE APPLICATION OF AUTOMATED TESTING SYSTEMS BASED ON A SIX DEGREE OF FREEDOM ROBOTIC MANIPULATORS
Complex-shaped surface represents one of the challenges in ultrasonic testing of metal castings. This conditions the growing interest in development and application of the automated testing system based on a six degrees...
THE USE OF COMPUTER IMAGE ANALYSIS IN DETERMININGBMATERIAL FLOW IN THE ROLLER PRESS DURING COMPACTING OF FINE-GRAINED MATERIAL
Mechanisms of fine-grained material flow in a roller press are a constant subject of research. The proper transfer of feed in the feeder has a significant influence on the correct course of the compaction and consolidati...