Case study - Earthmoving
8Pages

CASE STUDY REPARATION OF AN EXCAVATOR BUCKET SUPERCOMBINATA® BASIC

Super Xtrafactory Devices CASE STUDY REPARATION OF AN EXCAVATOR BUCKET SUPERCOMBINATA® BASIC The Supercombinata BASIC is Elsa’s new answer for the earthmoving sector. In this case study the boring machine was used on-site to repair the bucket of a JCB back excavator. Thanks to its small size and extreme versatility and precision, SP Centro Edile Sri has been able to carry out the processing directly on-site reducing time and costs compared to a conventional repair. THE USERS Sp Centro Edile is a company that produces, of inert materials in the municipality of Andali pumps and transports...

CASE STUDY Super Xtrafactory Devices REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC CENTERING OF THE BORING BAR Before starting the welding work, the surface was cleaned. The centering was done in traditional way, by welding the corresponding ELSA centering kit. It should be emphasized that the welding mode was preferred over other centering types, as working with this centering kit ensures higher precision for further processing.

CASE STUDY Super Xtrafactory Devices REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC MACHINE ASSEMBLY READY TO GO > After centering, the brackets were positioned and welded on by a fillet weld according to DIN EN 1993 (Eurocode 3). > The machine was then set up, locked through the threaded ring and the boring bar was inserted. > The appropriate tool holder required for machining was inserted and fastened in one of the bores of the boring bar. > Before starting the work, the boring bar was rotated by hand to check the correct positioning of the tool holder. ELECTRONIC CONTROL UNIT Once...

Aelsa* Super Xtrafactory Devices CASE STUDY REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC After completion of all the work related to the assembly of the machine and the control unit, the user performed the restoration of the concentricity of the hole by boring to eliminate any ovalization and residues of oily materials. With this machining, the diameter of the hole was increased and for this reason the overlay welding was carried out.

CASE STUDY Super Xtrafactory Devices REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC 5 After setting the correct parameters, the welding application phase was triggered by actuation of the welding lever, which sets the automatic synchronization of the rotation with the feed movement. During the overlay welding process in which the welding lance applies material on the machined surface, the previously set parameters could be subsequently changed by the potentiometer provided for this purpose. The welding operation was accompanied by an even noise, which confirms correct processing. The...

CASE STUDY Super Xtrafactory Devices REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC After the overlay welding phase, a roughing phase was carried out. As explained above, the boring bar and the tool holder were reinstalled. After the various parameters such as the speed of the boring bar and the feed rate were preset, it was possible to spindle out again. Rough- 0J8! turning was carried out with a suitable engine speed, calculated in m/min, depending on the material in connection with the correct cutting speed. After this phase, the machined hole was measured to verify the obtained...

CASE STUDY REPARATION OF AN EXCAVATOR BUCKET SUPERCOBINATA BASIC ACHIEVED RESULTS At the end of machining, after having completed the repair of the holes, the diameters of the holes and the roughness were measured. The total time for machining four bushings was approx. 236 minutes (less than 4 hours) and allowed the JCB rear excavator to be repaired in short time. Obviously, the processing time is indicative as it may differ depending on the user’s experience. The final measurements showed a value of 45 mm with H7 tolerance, while the roughness was 3.2 µm. Super Xtrafactory Devices Elsa Srl...