Modeling and Simulation of Closed-Loop Counterbalancing Hydraulic Units for Heavy-Duty Machine-Tools

Dobrescu

et al. 2016

AMM

In this paper we make a comparison between the most common balancing systems used in heavy duty machine tools and especially in CNC type ones. We introduce the systems with reducing valves, pumps with pressure regulator and the systems with accumulators assembled in closed circuit. For the latter we present calculation models used during operation under adiabatic transformations (operating times of seconds) or under isothermal transformations (operating times of minutes). There are also presented applications of these models for a gantry type milling machine and an AF type machine.

Section: Applied Mechanics and Materials Vol 859mentioning

confidence: 99%

Mathematical Models on the Closed Circuit Balancing Systems in Machine Tools

Dobrescu

et al. 2016

AMM

“…Currently there are specialized programs of calculation and simulation of the hydraulic systems [7]. These programs allow determining the static and dynamic features of the units in progress.…”

Section: Simulation Of Safety System Operationmentioning

confidence: 99%

Using Hydro-Pneumatic Accumulators to Increase the Operation Safety of Heavy Duty Vertical Lathes

Bălan

2015

AMM

This paper presents the principle diagrams that can be used to manufacture hydraulic systems that can prevent the seizing of the circular hydrostatic guideways of the table in the case of heavy-duty vertical lathes, with over 4000 mm diameter. The proposed systems will provide the lubrication of the guideways of the table as long as this one rotates up to a possible stop caused by an accident. Lubrication is achieved even in the absence of the machine supply voltage because it is provided by systems that do not need electrical power to operate. The absence of hydrostatic pressure, even in only one of the hydrostatic pockets, caused by the breaking of a hose, can be detected and will trigger the safety system activation.

“…There are also closed circuit balancing systems [7]. These systems use constant flow pumps and one or more pneumatic-hydraulic accumulators.…”

Section: Closed Circuit Balancing Systems With Constant Flow Pump And...mentioning

confidence: 99%

Theoretical and Experimental Researches on the Balancing Systems of Machine-Tools Feed Kinematic Chains

Bălan

et al. 2014

AMM

Self Cite

In this paper, the authors present some of the theoretical and experimental researches conducted in recent years in the field of large masses shifted vertically. The paper starts with a technical-economical comparative analysis of the hydraulic and mechanical balancing. The following are the most commonly used systems of hydraulic balancing for modern machine-tools, the CNC ones especially. Finally the paper presents some of the experimental achievements materialized in hydraulic balancing units for machine-tools.