Lack of Skills of Human Resources in the Machine Construction Industry

The paper summarises the results of a questionnaire survey that took place in January 2015 in order to assess the current and prospective standard of the qualification of human resources in machine construction companies in the Czech Republic. The questionnaire survey included 23 small machine construction companies （less than 50 employees）, 24 medium-sized machine construction companies （50-249 employees）, and 53 larger machine construction companies （250 and more employees）. The results of the survey indicated that almost one half （43%） of respondent machine construction company top management members planned to hire new employees this year. In addition, 50% of them confirmed their endeavour to keep the current headcount and a mere 7% of them specified problems that would lead to the dismissal of employees. However, what is bothering machine construction top management members is the lack of qualifications and practical experience of job seekers they have to deal with. The intention of the authors is to define the main reasons and propose possible solutions of this problem within human resource management in machine construction companies.

Research on the abrasive wear resistance of YDCrMoV coating produced by CO_2 shielded flux-cored wire surfacing

Caterpillar construction machines play an important part in many fields such as hydraulic and electric engineering, the construction of highway, for its particular of structure. The walking system of caterpillar construction machines is always under the condition of three-body abrasive wear. The abrasive wear of walking system is very severe, which always results in damages of components or structures of walking system of caterpillar construction machines. It is very important to repair the walking system by cladding technique. The abrasive wear properties of four kinds coatings produced by the shielded flux-cored wire surfacing for the repair of the damaged components of walking system of caterpillar construction machines have been studied experimentally on an MLS-23 type wet sand rubber wheel abrasive tester. The surfaces morphologies of the abrasively worn specimens and their microstructures are investigated by transmitting electron microscopy (TEM) after wear testing. Results show that the wear mechanism of cladding metals of the flux-cored wire No.1 and the No.2 is micro-cutting while that of the No.3 and the No.4 is micro-ploughing. The four kinds of flux-cored wire coatings present great potential applications for the repairing of caterpillar construction machines in the Three Gorges Engineering.

Application of Snapback Chronometry Method in Calculation of Regulation

Work study is an area of construction production rationalization in which with scientific, logical, holistic and system analysis methods of the process we gain optimum in way of work and time of work. Chronometry method is one of the work study methods which is appropriate for recording shorter cyclic processes and is based on statistical sampling theory. Determination of cyclic times and work performances of standard cyclic construction machines （SCCM） is one of key assumptions of dynamic planning of machine work on every construction site. Calculation methods of SCCM work performances arc one of basic research objects in the field of construction organization and technology. Study shows applied chronometry method in work of standard cyclic construction machine. Goal of this study is to accomplish regulation through measured time cycle and compare measured effects with effects obtained with standard methodology of calculating hydraulic excavator practical achievement for gaining regulation in order to determine main reasons which effect work performance on site.