The friction factor dependence on the load and revolutions in sliding bearings without relubrication

Beňo, Pavel; Marienčík, Ján; Turis, Ján; Kozak, Dražan; Konjatić, Pejo

doi:10.17559/tv-20140908114234

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The friction and wear are two important parameters when operating the machines, because according to them is possible observe if machine is working correctly [6][7][8][9][10][11]. This information can be useful in constructing and improving the machine for example by using a better material for tribological pairs [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Friction Behaviour and Wear Protection Ability of Selected Base Lubricants on Tribo-pairs Parameters of Machine Components

Kopčanová¹,

Kučera²,

Kučerová³

2018

Tribol. Ind.

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The experimental tests of selected tribo-pair in three loading cycles were compared in this paper. Tests were performed with mineral transmission oil and ecological synthetic ester base oil, which were dropping by Gravity Force through the overhead part of measuring head of the laboratory testing device. The influence of factors (load cycle, lubricant) on the bearing shells and shafts was statistically verified by analysis of variance (ANOVA). The relevant differences between average values of each specimens were defined using Duncan`s multiple range test with a p-value of 0.05. Dynamically loaded tribo-pairs showed bigger mass losses and higher friction coefficients compared to the static cycle in conditions of the experiment, regardless of the lubrication method. This effect was even more significant in environment lubricated with mineral oil. Results confirmed that processes of dynamic loading play a significant role in evaluating selected parameters (wear, friction force, friction coefficient) tribological nodes of agricultural, forestry and other industrial machines.

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Section: Introductionmentioning

confidence: 99%

The Effect of Friction Behaviour and Wear Protection Ability of Selected Base Lubricants on Tribo-pairs Parameters of Machine Components

Kopčanová¹,

Kučera²,

Kučerová³

2018

Tribol. Ind.

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Design of Grinding Machine Spindle

Rudolf

Fries

Učeň

et al. 2018

Multidisciplinary Aspects of Production Engineering

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When grinding high demands are usually placed on the geometrical tolerances of the workpiece surface. For this reason, the spindles of the grinding machines are normally designed with requirements for a minimum position change of the grinding disks due to external forces and bending moments. The design theory of these spindles is relatively well elaborated, as it represents the most frequently used solution in practice. However, there are also cases where it is necessary to grind some hard-to-reach areas, using a great ejection of the spindle. In these cases, it is necessary to reassess the required geometrical tolerances with regard to its necessity to comply with the minimal changes in the position of the grinding discs due to the great ejection. Where it is necessary to maintain high geometrical tolerances, it is necessary to ensure a greater rigidity of the spindle. This rigidity is usually improved by increasing its diameter. By doing this we also increase the weight of the spindle that is heavily ejected, and thus its deformation can occur due to gravity forces. That is why it is necessary to analyse the deflection of the spindle depending on its ejection in the course of its design. In the case we increase the diameter of the grinder spindle the possible applicable grinding disc diameter decreases, due to the growing size of its housing. Any grinding of hard-to-reach surfaces is therefore done in particular to improve the quality of the surface with low requirements on the geometrical tolerances. This article deals with the design patterns for a spindle used in axial grinding for inner rotating surfaces. The article contains a spindle design solution and an analysis of its deflections, depending on its ejection, and the size of the passive forces.

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The friction factor dependence on the load and revolutions in sliding bearings without relubrication

Cited by 2 publications

References 4 publications

The Effect of Friction Behaviour and Wear Protection Ability of Selected Base Lubricants on Tribo-pairs Parameters of Machine Components

The Effect of Friction Behaviour and Wear Protection Ability of Selected Base Lubricants on Tribo-pairs Parameters of Machine Components

Design of Grinding Machine Spindle

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