scholarly journals Investigation of the process of peeling walnuts between two parallel plates

2019 ◽  
pp. 110-117
Author(s):  
Yurii Polievoda
Keyword(s):  
Driving Force ◽  
Low Frequency ◽  
Parallel Plates ◽  
Technological Parameters ◽  
Low Frequency Oscillations ◽  
Crushing Force ◽  
Perpendicular Crack ◽  
Vertical Positioning ◽  
Brittle Destruction

The article provides a detailed overview of the process of splitting the kernel of a walnut. Examples of many ways to split the shell are given, all of their disadvantages and advantages are listed. The mechanical method of peeling nuts using low-frequency oscillations has been theoretically investigated and substantiated. The kinematics of the process of crushing nuts between two parallel plates has been extensively analyzed. Graphical correlations were obtained between the size of the nut shell and the dynamics of the driving force of the nut moisture. It is revealed that the process of destruction of the shell of a walnut consists of four stages, corresponding to the laws of brittle destruction. Presents: - dependence of the maximum force of crushing of a shell of a nut at 5% humidity; - the dependence of the maximum crushing force of nuts at different shell thickness for the case of horizontal positioning of the nut between two plates with perpendicular force on the surface of the joint halves of the nut; - the dependence of the maximum crushing force according to the humidity of the nuts at different shell thicknesses for the case of vertical positioning of the nut between two parallel plates with a vertical driving force; - the dependence of the maximum crushing force with the moisture of the nuts at different shell thicknesses for the case of horizontal positioning of the nut between two parallel plates with a force action along the slit. The energy of splitting (crushing) of nuts at their location in different positions between two parallel plates is also determined. Where it has been proved that the energy consumed in the process of crushing increases with the thickness of the shell of a walnut. At the same time, it is proved that energy consumption depends on the location of the nut in the process of crushing. Graph analyzes were performed to show that maximum crushing energy is recorded in the case of a horizontal arrangement of a nut with a perpendicular crack action. In this study, a large amount of information was obtained regarding the splitting of the walnut, depending on the structural and mechanical characteristics of the products, which in the process of processing are important for the determination of certain rational technological parameters.

Dornhonen ohne Kühlschmierstoff/Single-pass honing without cooling lubricant – Feasibility of a dry honing process and determination of the effects during machining

2021 ◽  
Vol 111 (07-08) ◽  
pp. 520-525
Author(s):  
Eckart Uhlmann ◽  
André Rozek ◽  
Sascha Zimmermann
Keyword(s):  
State Of The Art ◽  
Low Frequency ◽  
Single Pass ◽  
Current State ◽  
Low Frequency Oscillations ◽  
Process Forces ◽  
Cooling Lubricant ◽  
Chip Removal

Bei der Intensivzerspanung mit einem bohrungsfüllenden Werkzeug ist nach heutigem Wissensstand der Einsatz von Kühlschmierstoffen obligatorisch. Jüngste Untersuchungen haben gezeigt, dass eine Überlagerung niederfrequenter Schwingungen beim Dornhonen die Spanabfuhr, die Prozesskräfte- und momente sowie die Arbeitsergebnisse positiv beeinflusst. Darauf aufbauend wurde in dieser Arbeit das schwingungsüberlagerte Dornhonen ohne Kühlschmierstoff untersucht.   According to the current state-of-the-art, the application of cooling lubricants is mandatory while using a bore-filling tool for intensive machining. Recent investigations have shown that a superposition of low-frequency oscillations in single-pass honing improves the local chip removal and work results while reducing process forces and torques. Following this, the oscillation-superimposed single-pass honing without cooling lubricant has been conducted in this work.

scholarly journals Development and improvement of lost foam casting technology based on mathematical modeling

2018 ◽  
Vol 224 ◽  
pp. 01025 ◽  
Author(s):  
Nikolay Nesterov ◽  
Boris Vorontsov
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Detailed Analysis ◽  
Low Frequency ◽  
Lost Foam Casting ◽  
Technological Parameters ◽  
Optimum Range ◽  
Casting Technology ◽  
Low Frequency Oscillations ◽  
Lost Foam

A detailed analysis of the process of filling the mould for lost foam casting technology was made based on a mathematical model, that takes into account the emergence of low-frequency oscillations. The optimum range of technological parameters for a few specific details were discovered. The factors that may lead to the release of metal and to mould collapse were also identified.

scholarly journals Research of micro and nano profile surface morphology of vibrational mechanical and chemical zinc coating

2018 ◽  
Vol 226 ◽  
pp. 01018 ◽  
Author(s):  
Vladimir V. Ivanov ◽  
Nikolay P. Pogorelov ◽  
Mikhail F. Selemenev ◽  
Artem A. Sakunov
Keyword(s):  
Surface Morphology ◽  
Processing Time ◽  
Coating Layer ◽  
Zinc Coating ◽  
Low Frequency ◽  
Reliable Data ◽  
Technological Systems ◽  
Low Frequency Oscillations ◽  
The Given

There are some results of zinc coating research acquired on the metals’ surface as a result of mechanical and chemical synthesis, realized in conditions of vibro wave technological systems. The peculiarities of the surface morphology at the micro / nano level of the zinc coating are shown which are formed under the influence of low-frequency oscillations. The growth interconnection of the micro / nano profile of the applied zinc coating is shown. The determination of changes occurring on the coating layer surface at the micro / nano level. The absence of reliable data of the surface layer of the coating at the nano level has significantly limited its modification background. All of the mentioned above brings up to the following task, the given article is devoted to its solution: establishment of particlesdimension, the way of their distribution on the metal surface, besidestheir maximal and minimal roughness data cause by the alteration of the processing time.

Observations on a spatial-resonance phenomenon

1972 ◽  
Vol 53 (2) ◽  
pp. 209-216 ◽  
Author(s):  
Ian Huntley
Keyword(s):  
Water Wave ◽  
Driving Force ◽  
Low Frequency ◽  
Resonance Phenomenon ◽  
General Mechanism ◽  
Driving Frequency ◽  
Model Situation ◽  
Dissipative Effects ◽  
Low Frequency Oscillations ◽  
Spatial Resonance

The phenomenon was observed during experiments in which a beaker containing water was vibrated in one of its bell modes (the inextensional flexural vibrations of the wall). For certain combinations of driving force and frequency, a standing water wave of large amplitude was generated whose peripheral wavenumber might be either zero (i.e. the wave was radially symmetric) or twice that of the bell mode. This relationship between the wavenumbers of the bell mode and water wave, and the fact that the driving frequency was many times that of the water wave, indicated that this was an instance of a general mechanism that has been studied theoretically by Mahony & Smith (1972). For a model situation, allowing for dissipative effects and nonlinear coupling between nearly resonant oscillations at greatly differing frequencies, they derived a relation-ship between the driving force and frequency representing conditions of neutrals tability (i.e. such that the rate of energy transfer from the high frequency to the low frequency oscillations is zero). The aim of the experimental observations reported here was to check this relationship and other predictions of their theory.

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