The Possibility of Increasing the Wearing Resistance of Mulcher Tools

Ťavodová, Miroslava; Kalincová, Daniela; Kotus, Martin; Pavlík, Ľubomír

doi:10.2478/ata-2018-0016

Cited by 14 publications

(6 citation statements)

References 4 publications

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“…A significant conclusion is that the strong adhesive bonding of the base, edges and other layers necessary for the safe use of the ski are in direct interaction with the slope. Interaction of the functional surface with the external environment is one of the basic requirements to ensure the functioning of the production [ 27 , 28 ]. Delamination of the base and edges was not demonstrated by SEM image analysis.…”

Section: Resultsmentioning

confidence: 99%

Research on Low-Cycle Fatigue Engineered Hybrid Sandwich Ski Construction

et al. 2022

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This research is aimed at evaluating the effect of low-cycle fatigue on a newly designed hybrid sandwich ski structure to determine the changes that may occur due to cyclic loading and thus affect its use. This is primarily concerned with the fatigue behavior of the tested ski over different time intervals simulating its seasonal use and its effect on the mechanical properties of the ski, i.e., the durability and integrity of the individual layers of the sandwich ski structure. The ski was subjected to 70,000 deflections by moving the crossbar by 60 mm according to the ski deflection calculation in the arch. The results of the cyclic tests of the engineered ski design showed no significant changes in the ski during loading. The average force required to achieve deflection in the first 10,000 cycles was 514.0 4.2 N. Thereafter, a secondary hardening of the structure occurred during relaxation and the force required increased slightly to 543.6 1.7 N. The required force fluctuated slightly during the measurements and in the last series the value was 540.4 0.8 N. Low-cycle fatigue did not have a significant effect on the mechanical properties of the ski; there was no change in shape or visual delamination of the individual layers of the structure. From the cross-section, local delamination was demonstrated by image analysis, especially between the Wood core and the composite layers E-Glass biaxial and Carbon triaxial.

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Section: Resultsmentioning

confidence: 99%

Research on Low-Cycle Fatigue Engineered Hybrid Sandwich Ski Construction

et al. 2022

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“…При проведении лесовосстановления и реконструкции лесонасаждений, кроме применения традиционных лесных машин (харвестеров и форвардеров, машин для транспортировки лесосечных отходов) [4,6,22] с последующим удалением пней и корней корчевателями различной конструкции [3,5,10], перспективным является применение мульчеров и ротоваторов [1,8,12], которые требуют значительных затрат мощности на их привод. В связи с этим целью исследований является изучение влияния различных природно-производственных факторов на выбор параметров технологического оборудования [15,21], базового шасси [11] и их надежность [18,20]. В настоящий момент отсутствуют методики и рекомендации, позволяющие производить расчет фрезерного оборудования для имеющегося базового шасси или решать обратную задачу, в том числе на основе математического моделирования [11,13].…”

Section: Introductionunclassified

Power Characteristics of Mulcher Joints When Removing Tree and Shrub Vegetation

Ariko¹,

Voinash²,

Kononovich³

et al. 2021

Lesnoy Zhurnal (Forestry Journal)

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In recent years, the enterprises of forestry and the Ministry of Energy of the Republic of Belarus and other countries widely implemented advanced milling tools designed to chop wood, stumps and roots without immersing the cutter in the soil (mulchers) and with immersion (rotovators), which allows you to prepare the ground for planting forest crops. They can be mounted on multi-purpose tractors, loaders and excavators. At the same time, there are no methods that allow carrying out a reasonable choice of technological equipment for a particular basic machine, since a significant number of production, technological and technical factors have an impact on the emerging power and capacity parameters. The proposed method allows taking into account a significant number of variable values (working methods, speeds of various operations, parameters of the working body, its drive and base chassis, soil conditions, etc.) and simulate the interaction of milling tools under various operating conditions. It was found that the greatest loads on the mulcher rotor occur during the felling of tree and shrub vegetation, which is associated with an increase in the area of interaction between the cutters and the wood up to 2 times compared with the chopping of similar lying stands. This value can be reduced by 15–30 % depending on the diameter of the trunks being processed. In the case of a significant amount (cluster) of forest stands with a diameter of more than 10 cm, it is preferable to carry out work at a speed of about 0.2 m/s or advanced felling of these trees. The use of hydraulic travel (speed) reducers or hydrostatic transmission is promising in order to reduce dynamic loads and get better adaptability of the working equipment to natural-production conditions (the ability to work at a speed from 0 to 5 km/h). It should be noted that the installed required engine power for the milling equipment drive should be increased by 10–15 % due to the needs of the drive of various equipment located on the base chassis. Also, in the case of the integrated use of tree and shrub vegetation, it is possible to use mulchers that collect biomass; however, this will require additional energy costs. In this regard, the method can be applied when choosing the parameters of technological equipment for the existing base chassis, to solve the inverse problem, and also to select the operating mode of the milling equipment depending on the natural and production conditions with the possibility of subsequent prediction of the effectiveness of the work performed.

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“…Many researchers suggested conventional heat treatment processes to enhance the wear resistance and surface hardness properties of materials, working under adverse conditions as per their applications [42]. Tavodova et al [43] studied the abrasive wear resistance of quenched and tempered heat treated 16MnCr5 mulcher tools and observed that after heat treatment, the ferritic-pearlitic steel structure was converted into a tempered martensitic structure, which exhibited higher wear resistance and hardness than untreated steel. In another study, Singh et al [32] examined the wear behaviour of cryogenically treated 30MnCrB4 rotavator blades and found 60% and 260.73% enhancement in wear resistance and hardness level respectively in comparison of bare rotavator blade.…”

Section: Introductionmentioning

confidence: 99%

Tribological performance of hardfaced and heat treated EN-47 steel used for tillage applications

Singh¹,

Chatha²,

Sidhu³

2020

Surf. Topogr.: Metrol. Prop.

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In the present work, two different hardfacings, namely SZ (Super-Zed alloy; C3.83Cr33.37) and ZK (Zedalloy-K; C0.65Cr4.5Mo8.18) were deposited on EN-47 ploughshare steel by manual metal arc welding process to enhance the abrasive wear resistance. In addition, the influence of heat-treatment of steel by two different methods, i.e., carburizing (C) and through-hardening (Q&T), on the abrasive wear behaviour has also been investigated. Abrasive wear studies were conducted on bare, hardfaced, and heat-treated steel in a laboratory by using a three-body dry sand rubber wheel test rig as per the ASTM G-65 standard. The bare steel suffered a high wear rate, which may be attributed to its soft ferritic-pearlitic microstructure. The abrasive wear rate of tested specimens was found to be 1.7651 × 10−3 g m−1, 0.7439 × 10−3 g m−1, 0.961 × 10−3 g m−1, 0.992 × 10−3 g m−1 and 1.21 × 10−3 g m−1 for bare, SZ, ZK, C and Q&T steel specimens respectively. The SZ hardfacing provided better abrasive wear protection than the other treatments due to high chromium and carbon concentration in the hardfacings electrodes, which presented a higher area fraction of primary M7C3 carbides in the matrix. The wear resistance indices (WRI) for SZ hardfacing, ZK hardfacing, carburized, and through-hardened steel specimens were found to be 2.37, 1.84, 1.78, and 1.46, respectively.

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The Possibility of Increasing the Wearing Resistance of Mulcher Tools

Cited by 14 publications

References 4 publications

Research on Low-Cycle Fatigue Engineered Hybrid Sandwich Ski Construction

Research on Low-Cycle Fatigue Engineered Hybrid Sandwich Ski Construction

Power Characteristics of Mulcher Joints When Removing Tree and Shrub Vegetation

Tribological performance of hardfaced and heat treated EN-47 steel used for tillage applications

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