Tool machinery vibrations frames comparison concerning welded or moulded manufacturing structures Dan Ovidiu Glavan 1,* , and Theoharis Babanatsas 1 1 University “Aurel Vlaicu” of Arad, Faculty of Engineering, 310130 Arad, Romania Abstract. Precision of manufactured object is the main goal for all engineers in modern times. The times of massive structures with low dis- placement have passed. We are looking forward now to develop new type of structures with controlled deformations easy to predict and therefore to correct in order to obtain the „ideal” product. The paper is analysing tool machinery frames vibrations in welded and moulded manufacturing structures ,the vibrations being studied in both horizontal and vertical planes and the loads are simulated as manufacturing loading pulses generated by special excitation electromagnetic devices, in order to determine advantages and disadvantages of using them for frames in projecting, producing and exploitation of tool machinery. 1 Theoretical considerations In welded and moulded structures in any machinery bed frame structure appears vibration in the moment of work. This vibration are unmaintained free dynamic balance equation (1), vibrate movement is of the form: ̈ + ̇ +  = 0 (1) where: m - mass; c - damping coefficient; k - spring constant; x – acceleration; ̈ - displacement; ̇ -speed [1-3]. King m and noting (2):   =     =  (2) we get (3): ̈ + ̇ +   =0 (3) where p - pulsation of the system (4): * Corresponding author: glavan@fortuna.com.ro DOI: 10.1051/ , 01005 (2017) 71210 1 1005 MATEC Web of Conferences matecconf/201 21 MSE 2017 © The Authors, published by EDP Sciences. This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).