High-power transmission capacity at low-energy losses, low noise emissions, high reliability, and ease of maintenance, as well as convenient cost-effectiveness, are required for industrial ...applications regarding variable electro-hydraulic supply systems. Only up-to-date principles regarding volumetrically controlled hydraulic energy using variable supply systems and appropriate control strategy have proven satisfactory for these requirements. The aim of the present work was to study the applicability of a low-priced drive concept using a speed-controlled induction motor in combination with a constant-displacement pump applied in a load-sensing control strategy. The suggested approach of the drive concept has been experimentally verified on a prototype of the drive. A hydraulic press-brake used for the machining of casting products in the automotive industry was taken into consideration.
In this paper the recent developments in linear motor driven systems in the field of metal forming technology are presented, where an increasing use of linear motors in peripheral devices such as ...feeders or transfer systems as well as in main press drives could be noticed. Within the presented research projects the manufacturing accuracy and the stroke rate of presses as well as the energy efficiency can be significantly increased by using linear motors.
Today, the cyclic feeding of sheet metals in metal forming machines is realized by means of mechanical roll or grip feeders. The limited feeding forces as well as the restricted dynamics and the ...potential for damaging the sheet surface as a result of mechanical contact often restricts the production rate of the entire press line. At the IFUM, a new contactless feeding system has been developed, based on the asynchronous linear motor, with which high feeding forces can be applied to the electrically conductive sheet metal contactless by means of electromagnetic forces. In this paper, the feeder’s operation characteristics depending on the sheet material properties and also on their geometry are presented. According to simulations and experiments the feeding forces could be significantly increased in comparison to reachable forces in case of using roll feeders.
Modern machinery and equipment manufacturers incorporate advanced technology into their products. This is especially true for those applications where an electro-hydraulic supply system is used, e.g. ...on tool and metal shaping/forming machines. Such machines represent a complex and multitechnological mechatronic system, and should be first modelled and simulated, especially in respect of dynamic behaviour. This paper presents a theoretical analysis of an energy-saving and cost-effective electro-hydraulic supply system on a hydraulic press-brake, used within the automotive industry. It emphasises the designing an adequate mathematical-simulation model, to serve as the basis for decisions concerning the used supply system's dynamic. (Received in December 2010, accepted in June 2011. This paper was with the authors 2 months for 1 revision.) Key Words: Metal Forming Machines, Electro Hydraulic System, Modelling, Simulation
Over the last twenty-five years a new method of manufacturing thin-walled, high-precision tubular parts has been applied: tube spinning using balls. Most of the process design is done empirically or ...based on industrial experience. This paper gives a method of theoretical process analysis, which covers areas of interest such as the process-zone geometry, the contact surfaces, the force, the torsional moments, the power, and the work. Of special importance is the relationship between the ball size, the axial feed and the number of balls, which determines the surface quality of the parts. Power estimation might be useful in the design of tube spinning devices, which usually require much less power than conventional ironing. Good correlation is observed between reported experimental data and values calculated by the computer application of the algorithm given in this paper.
In this paper, the forming principle for the cold-rolling of a vane is described. The technological parameters, such as the developed dimensions of the vane, the rolling deformation zone, the blank ...size, the reduction, and the requirements of the cold-rolling technology in respect of raw materials are discussed and determined. Studies on the cone angle of the working roller and on the structure of the stretch-out-unit of the cold-rolling machine have provided much important information for cold-rolling technology and the structural design of the rolling machine.
Turning on CAM technology Lewis, M
American machinist (1988),
05/2002, Letnik:
146, Številka:
5
Magazine Article
"G-code programming of advanced turning machines is sometimes too difficult for most manual CNC programmers. Most CAM systems offer only minimal support for these machines; therefore, a majority of ...those programming advanced turning machines rely on on-board conversational programming. The problem with this is that, in most cases, conversational programming does not take advantage of CAD data. As a general rule, the machine is usually sitting still while conversational programming is taking place.
PDF
