INFLUENCE OF WHEELED TYPES OF A Skidder ON PRODUCTIVITY AND COST OF THE FOREST HARVESTING

Oliveira

Rodrigues

et al. 2017

Nativa

The effects of certain operational variables on working time and skidder productivity in wood extraction in Eucalyptus grandis stands were investigated in this research. The study was conducted at a forestry plantation located in the municipality of Telêmaco Borba, Paraná State. Through a time and motion study the operational cycle time, mechanical availability, operational efficiency and productivity in relation to the variables volume, cycle time and extraction distance were quantified. The data were analyzed using Tukey's test at 5% probability and then fitted to a statistical model to explain the behavior of the variables in terms of machine productivity. Results showed that the time consumed by the empty and loaded travel phases was 20.4 and 45.0% of the total operational cycle time, respectively. Extraction distance directly affected the elements of operational cycle time and machine productivity, making it an important variable to consider in operational planning. The independent variables used explained around 82% of the skidder productivity variation, with the proposed model being suitable for use in wood extraction under similar conditions.

Section: Discussionsupporting

confidence: 88%

Variables Influencing Working Time and Skidder Productivity in Wood Extraction

Oliveira

Rodrigues

et al. 2017

Nativa

“…This result, although it does not show a significant difference, should be considered relevant, since, with the introduction of a maintenance system based on preventive maintenance, the maintenance cost of the machines was reduced. The values obtained for the maintenance cost of skidder were above the costs observed by Lopes et al (2014), studying the forest tractor skidder in the extraction of wood, in which they observed an average maintenance cost of R$ 102.30 per hour worked.…”

Section: Discussionmentioning

confidence: 50%

“…In this sense, researchers infer that forest harvesting activities represent high costs in the forest productive process, and can reach 50% or more of the industry wood costs, having, possibly, a great economic impact on the forest-based industry (GUEDES et al, 2017). Lopes et al (2014) and Silva et al (2010), studying the extraction and logging operations, respectively, identified that only the cost of mechanical maintenance can represent up to 60% of forest harvesting machine total cost, being clear the importance of the maintenance sector within the activity of wood harvesting.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Indicators and Cost of World Class Maintenance (Wcm) in Forest Machines

Diniz

Miranda

et al. 2019

The study was carried out at a forest company located in the Paraná State, Brazil, with the feller buncher, skidder and harvester. The following indicators were evaluated: mechanical availability, mean time between failures, mean time to repair, proactive maintenance index and maintenance costs, based on data obtained over a period of 18 months, contemplating the stages of implantation, maturation and stabilization of the WCM. The results showed an increase in the mechanical availability of the cutting and skidding machines from the implantation stage. The mean time between failures increased from the implantation stage, from 31.59 hours to 37.01 hours in the stabilization stage. As for the mean time to repairs, skidder and harvester presented an increase of 25.9% and 18.9% respectively; however, this increase in time represented an improvement in the quality of maintenance services, reflected in the results of mean time between failures. There was also a 31% increase in the proactive index of the machines studied, resulting in 9% reduction in maintenance costs between the deployment and stabilization stages.

“…Dado o cenário atual, as empresas vêm buscando avaliar todo futuro investimento e, nesse contexto, a manutenção de equipamentos de colheita florestal mostra-se como ponto chave, uma vez que seus custos podem variar de 50 a 60% do custo total do equipamento (SILVA et al, 2010;LOPES et al, 2014). Yamashina (2000) comenta que um dos principais modelos de manutenção utilizados é o World Class Maintenance (WCM), que utiliza como base a manutenção preventiva.…”

Section: Introductionunclassified

Manutenção Preventiva Como Determinante Para Redução De Custos De Manutenção De Um Feller Buncher

Diniz

Miranda

et al. 2017

BIOFIX

RESUMO ABSTRACTThis work evaluated the mechanical maintenance activity of a feller buncher using World Class Maintenance (WCM), which uses preventive maintenance as a premise, aiming at reducing production costs and making better use of available resources. The study was carried out in Pinus taeda and Eucalyptus grandis stands of a forest company located in Paraná State, Brazil. The analysis contemplated three subsequent periods of six months, being: implantation, ripening, and stabilization of the WCM model. The evaluation was performed through the determination of mechanical availability, hydraulic oil consumption, and maintenance costs. The results showed that there was an increase in mechanical equipment availability of 1.75%. For the consumption of hydraulic oil, after the implementation period, there was a 63% reduction, reflecting the preventive maintenance carried out during the activities. The maintenance cost in the WCM model showed a 14.4% reduction, due to the investment of infrastructure and training of mechanics and operators. The WCM model showed applicability in the maintenance of forest cutting equipment, with potential for improving operational safety, productive capacity, and increasing their useful life. PALAVRAS-CHAVE:Corte florestal, Mecanização, World Class Maintenance.