Grinding Mode Research Articles

Technological Forecasting of Deformations in Flat Parts

Abstract The deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.

Dynamic characteristics of abrasive grains and machined surface features for variable axis diamond grinding of quartz glass

There is a fine application prospect for multi-axis grinding of hard and brittle materials with diamond ball end tool. The effects of tool inclination angles and grinding modes of multi-axis grinding of quartz glass on the dynamic characteristics of the diamond abrasives, surface topography, surface fragmentation phenomenon, and surface roughness were investigated in this work. Material removal characteristics and surface formation conditions would be significantly affected by the effective cutting speed, material stress characteristics, and movement space path derived from different grinding modes and tool inclination angles. The surface texture direction is mainly determined by feed direction of the cutter and initial cutting moment and geometry feature of the engaged diamond abrasives. The surface fragmentation phenomenon of the formed surface is apparent when the corresponding surface roughness values are relatively larger. The machined surface with significant surface fragmentation phenomenon is mainly produced by materials' brittle fracture modes, such as larger positive lead and smaller negative tilt under conventional grinding and smaller negative lead angles and larger positive tilt angles under down grinding. Ideal surface evenness could be obtained by using lead or tilt 0° for conventional and down grinding. The ground surface with smaller surface roughness could be produced when employing tool postures, such as negative lead or positive tilt under conventional grinding and positive lead or negative tilt under down grinding condition.

Minimizing the aerosol-generating procedures in orthodontics in the era of a pandemic: Current evidence on the reduction of hazardous effects for the treatment team and patients

The purpose of this critical review is to list the sources of aerosol production during orthodontic standard procedure, analyze the constituent components of aerosol and their dependency on modes of grinding, the presence of water and type of bur, and suggest a method to minimize the quantity and detrimental characteristics of the particles comprising the solid matter of aerosol.Minimization of water-spray syringe utilization for rinsing is suggested on bonding related procedures, while temporal conditions as represented by seasonal epidemics should be considered for the decision of intervention scheme provided as a preprocedural mouth rinse, in an attempt to reduce the load of aerosolized pathogens. In normal conditions, chlorhexidine 0.2%, preferably under elevated temperature state should be prioritized for reducing bacterial counts. In the presence of oxidation vulnerable viruses within the community, substitute strategies might be represented by the use of povidone iodine 0.2%-1%, or hydrogen peroxide 1%. After debonding, extensive material grinding, as well as aligner related attachment clean-up, should involve the use of carbide tungsten burs under water cooling conditions for cutting efficiency enhancement, duration restriction of the procedure, as well as reduction of aerosolized nanoparticles. In this respect, selection strategies of malocclusions eligible for aligner treatment should be reconsidered and future perspectives may entail careful and more restricted utilization of attachment grips. For more limited clean-up procedures, such as grinding of minimal amounts of adhesive remnants, or individualized bracket debonding in the course of treatment, hand-instruments for remnant removal might well represent an effective strategy. Efforts to minimize the use of rotary instrumentation in orthodontic settings might also lead the way for future solutions.Measures of self-protection for the treatment team should never be neglected. Dressing gowns and facemasks with filter protection layers, appropriate ventilation and fresh air flow within the operating room comprise significant links to the overall picture of practice management. Risk management considerations should be constant, but also updated as new material applications come into play, while being grounded on the best available evidence.

Formation of shot dimples during shot peening

In the aircraft industry, the technology of shot peen treatment is successfully used for the manufacture of long panels and sheaths, both for forming and finishing hardening. Shot dimples increase the roughness of the treated surface, so after the shot peening, the surface should be grinded with flap wheels to improve the roughness values by partially removing the traces of shot impact. To assess the quality of shot peening as a monitoring indicator, in practice the degree of coverage of shot dimples on the treated surface is used, which is determined by the percentages of the total area of shot dimples to the total area of the considered treatment part. To assign the modes of subsequent grinding with flap wheels, it is necessary to determine the allowance for grinding, which is determined by the value of the maximum depth of the largest dimple within the base area of the treated surface. The paper presents a method of creating a mathematical model to determine the size of dimples in shot peening, as well as modeling and engineering analysis of the shot peening process with the finite element method.

WEAR GRINDING WHEELS WITH PRECISE WORKING SURFACE

. The use of circles with an intermittent working surface is an effective means of increasing productivity and reducing the heat stress of the grinding process. These positive effects are largely determined by the appearance of high-frequency oscillations in the elastic system of the machine, which facilitate the chip formation process and create conditions for continuous self-formation of the cutting microrelief of the working surface of the abrasive tool. However, for certain aggregates of rigidity of the elastic system of the machine, geometric parameters of the macrorelief of the working surface of an intermittent circle, and parameters of the cutting mode, parametric resonance may occur, which is accompanied by catastrophic wear of an abrasive tool and a deterioration in the geometric and physical-mechanical characteristics of the quality of the surface layer of the workpiece. The aim of the work is to study the influence of grinding mode parameters and geometric parameters of the working surface of intermittent abrasive wheels on their dimensional and linear wear, as well as identifying areas of their rational use. It was found that oscillations during intermittent grinding caused by parametric resonance can be significantly reduced or eliminated completely by increasing the rigidity of the elastic system of the machine, using discontinuous circles of a certain geometry, and increasing the peripheral speed of the circle. Based on the experiments to determine the specific wear of the elbore dashed circles, the expediency of their use in deep encryption is substantiated. t is established that to increase dimensional stability of an abrasive tool it is necessary to increase the circular velocity to 40 m / s and to provide in the machines the possibility of preserving the constancy of the circular velocity of the circle as it is worn.

Grindability of Quartz under Compressive and Impact Forces

Abstract: This paper presents a comparative study between the grindabiltiy of quartz by compression and impact forces as two different modes of size reduction in mineral comminution. The compression tests are carried out in a piston die, and the impact tests are performed using a stamp mill. Two quartz size fractions, (-6.3+4.75mm) and (-2.36+1.7mm) at sample weights of 150 and 100 grams were used for comparison of the behavior of quartz under the two different modes of material disintegration forces. The obtained results showed that the cumulative weight of the product size distributions is reasonably normalizable with respect to the median particle size, X50, for both compression and impact modes. The specific energy expended is inversely proportional to the median size of the products, and the reduction ratios (RR), X50f/X50p, are directly proportional to the applied forces in both grinding modes, and hence, to the specific energy expended. However, under the studied conditions, there is superiority of grinding by impact force, particularly at the high energy levels, over compression grinding in terms of reduction ratios and the fineness of the ground product. Analysis of the results points to conclusions concerning the choice of grinding equipment ensuring the most beneficial course of the size reduction process for a specific job.

A robotic belt grinding approach based on easy-to-grind region partitioning

For workpieces featured with complex shapes, it is difficult to plan their toolpaths for robotic belt grinding by off-line programming (OLP) owing to frequent gouges between the workpiece and contact wheels. Hence, this work presents a region-based robotic belt grinding approach to facilitate avoiding such gouges for toolpath generation. With the approach, gouge analysis algorithms for two main belt grinding modes, namely wheel face grinding and wheel edge grinding respectively, are proposed. Machinability analyses of these two modes in machining various types of surfaces are then conducted. A concept, namely ‘easy-to-grind region’, is proposed so that the surface to be ground can be partitioned into different regions, and then by imitating the behavior of experienced workers in manual grinding to avoid gouges, the algorithm to select compatible belt grinding mode for partitioned regions is presented. Experimental studies are conducted and show that the proposed approach can significantly decrease the complexity in generating a gouge-avoidance toolpath for belt grinding such complex workpieces.

Modeling and Optimization of the Fabrication of Al<sub>2</sub>O<sub>3</sub>- Based Ceramocomposites Reinforced with Carbon Nanotubes

The physico-mechanical properties of ceramic-matrix Al2O3-based composites are strongly influenced by the particle size of Al2O3, the presence of carbon nanotubes (CNTs), and the temperature regimes of sintering. In order to obtain the very low porosity ceramic composites with high rates of flexural strength and crack resistance, mathematical models were developed for grinding the particles of Al2O3 and spark plasma sintering of the composite. Mathematical models were based on the equations of the balance of the number of particles by size taking into account their grinding (for the grinding stage), the balance of pores in the composite by the size (for the sintering stage). The kinetic parameters of mathematical models were determined and a good agreement was reached between the calculated and experimental results. The developed models were used to determine the optimal modes of grinding and sintering stages, which made it possible to obtain, in particular, the composite Al2O3 - CNT (20 vol. %) with bending strength 540 MPa, and crack resistance 6.3 MPa·m1/2.

Identifying patterns in the effect exerted by a cooling process and the fine grinding modes on the qualitative indicators of a meat and bone paste

This paper describes a technology for obtaining a homogeneous meat and bone paste made through a multi-stage grinding at a chopper grinder and the micro-grinder Supermasscolloider. The relevance of the study relates to that the meat and bone raw materials are processed for food purposes, thereby improving a non-waste technology in the meat processing industry. The effect of a cooling process and the parameters of fine grinding on the quality indicators and the microstructure of meat and bone paste after grinding has been studied. The research results have established that a decrease in the diameter of a chopper grinder's mesh leads to an increase in the temperature of meat and bone mince, from 16 °C to 26 °C. A change in the temperature of output raw materials has been investigated at the micro-grinder Supermasscolloider with different gaps between the grinding wheels (0.25 mm, 0.10 mm, 0.02 mm), depending on the amount of added water. It has been established that following the grinding at a micro-grinder with the addition of water the temperature of the raw materials at the output decreased, at gaps of 0.25 mm and 0.10 mm, from 34 °C to 17 °C; at a gap of 0.02 mm ‒ from 37 °C to 19 °C. When studying the functional and technological properties of a meat and bone paste with the addition of 50 % of water, it was found that the meat and bone paste had high moisture-binding (75.63 %) and fat-retaining (73.38 %) capacities. The moisture-binding capacity of the meat and bone paste was 65.3 %, the emulsifying capacity was 55.8 %. The microstructure and granulometric composition of the meat and bone paste with the addition of 50 % of water have been studied. The result of the conducted analysis of the geometric dimensions of bone particles has revealed that when the minced meat and bone are processed at a micro-grinder, the size of the bone particles was within the set gaps between the grinding wheels, while the consistency of the meat and bone paste was uniform and ointment-like

Substantiation of the algorithm for controlling the adjustable electric drive of roller crusher-grinders of forage grain

In recent years, along with the traditional technology of dry grain storage and grinding before feeding, the technology of preserving crushed grain at an early stage of ripeness is widely used. These technologies do not replace each other, but objectively complement each other, that is, they exist in parallel and require appropriate equipment for their implementation. To do this, it is necessary to use universal energy-efficient equipment for crushing feed grain with a high annual load. As such equipment, it is advisable to use roller crusher-grinders with individual electric drive of the rollers. The process of crushing and grinding grain is significantly affected by the physical and mechanical properties of the grain and the design and technological parameters of roller crusher-grinders. Analysis of the strength properties of the grain shows that in order to reduce the energy intensity the process of crushing the grain must be carried out at a higher moisture content and the deformation rate should be as high as possible. When a certain circumferential speed of the rollers is reached, the process reaches both maximum performance and minimum energy consumption. The control algorithm is based on changing the speed of the rollers stepwise from a lower speed to a higher one. In this case, at each stage a metered portion of grain is crushed between the upper and lower flaps of the vertical loading shaft, and the time by which this portion will have been worked out is measured. This procedure is carried out by changing the speed from lower to higher until the speed at which crushing of the portion will take the minimum time is determined. If the technological process requires a grain grinding mode, the speed of one of the rollers increases from the optimal crushing rate. The speed increase occurs as long as the recu-peration current in the parallel-connected DC buses of the frequency converters increases.

Microgroove grinding of monocrystalline diamond using medium-frequency vibration-assisted grinding with self-sensing grinding force technique

Abstract This study presents an approach to extra-hard material removal using medium-frequency vibration-assisted grinding with grinding force for producing a microgroove array on monocrystalline diamond (MCD). Vibration mode at nano-amplitude is employed to vibrate the MCD workpiece against the polycrystalline composite diamond (PCD) wheel-tool during grinding. This approach is used to break the covalent atomic bonds of diamond, creating a nanocracked subsurface layer thereby reducing grinding during material removal. The PZT stage’s grinding system is designed with a low center of gravity, bilateral symmetry, and an in-situ co-shaft grinding devise. This setup provides a well-defined nanoscale depth of grinding. Expentmental results show that a highly consistent, smooth crisscross microgroove array can be successfully produced on MCD with no apparent burrs and chipping. It is confirmed that medium-frequency vibration-assisted grinding with grinding force remarkably reduces grinding and improves the surface finish on a MCD workpiece. In addition, these experiements prove that diamond’s innate charateristic of thin-brittle resistance self-generates a nanocrack growth boundary stopping further crack expansion. Using a self-sensing grinding force design allows the system to determine whether the nanocracked subsurface layer has been completely removed. This ensures high quality grinding, which produces a flat, solid microgroove surface on MCD. Furthermore, detailed discussions are conducted for the following aspects: effects of dressing using spark erosion, influences of amplitude and grinding mode, geometry and topography of microgrooves, PCD wheel tool wear, and an assesment criterion for available nasal-tip radius.

РАЗРАБОТКА СОСТАВОВ САМОУПЛОТНЯЮЩЕГОСЯ БЕТОНА НА ОСНОВЕ БЕТОННОГО ЛОМА С ИСПОЛЬЗОВАНИЕМ СТРУКТУРНЫХ ХАРАКТЕРИСТИК

Abstract. Huge amount of recycled concrete is formed when dismantling of buildings. The paper describes an efficient application of recycled concrete aggregates and concrete grinding fines to obtain technological, economic and ecological benefits. The possibility of effective application as materials for self-compacting concrete with the use of crushed concrete and recycled concrete fines is shown. The use of filler in self-compacting concrete mixtures obtained by activation of concrete grinding fines with polycarboxylate-based superplasticizer is shown. This paper presents the results of research of self-compacting concrete produced with recycled concrete aggregates and activated filler. The physical and mechanical characteristics of coarse aggregate, grain distribution of aggregates and sand proportion in aggregate mix, design of self-compacting concrete mixture and its structure properties with use mathematical experiment planning method were carried out. This method applies in the design of the self-compacting concrete mixture by solving the system of equations. The equations obtained by corresponding mathematical models. The obtained mathematical models include argumentative characteristics defined by the end of structure formation. The optimal content of filler in self-compacting concrete mixture is determined. The optimal grinding mode of the equipment with specified specific surface area of the filler is obtained. The grain-size composition of mixture consisting of quartz sand and crushed concrete aggregate with fraction of 5-10 mm based on term of maximum approximation to the Fuller ideal gradation curve is designed.

Experimental investigation on high-shear and low-pressure grinding process for Inconel718 superalloy

In this work, we reported a novel grinding method with high tangential grinding force and low normal grinding force using specially developed grinding tools. The tools were made of flexible composites based on the principle of liquid body armor and the shear thickening mechanism of non-Newtonian fluid. During grinding, abrasive particles are capable of generating a “hydro-cluster effects” under reverse tangential load, which lead to the decreased normal grinding force and the increased tangential grinding force. Hence, workpiece materials are removed under “high-shear and low-pressure” grinding mode. A serial of grinding experiments were carried out on Inconel718. The results showed that the novel grinding tool had an excellent grinding performance on Inconel718 workpieces. The value of surface roughness decreased from Ra 473.7 nm to Ra 153.0 nm under the optimal grinding parameters, i.e., wheel speed of 1 m/s, workpiece speed of 2000 mm/min, and grinding depth of cut of 180 μm. The surface defects of the Inconel718 workpiece were gradually removed. Meanwhile, the uniformed grinding textures were generated. The surface of the grinding tool had residual wear debris, and there was a little loss of grains after 240 grinding cycles.

Разработка системы автоматического управления струйным измельчением на основе экспериментальных данных

Актуальность тематики данной работы определяется необходимостью снижения энергоемкости тонкого измельчения путем управления процессом, что предлагается осуществлять на основе результатов акустического мониторинга. В работе предложена система автоматического управления по критерию максимальной производительности, учитывающая особенности процесса. Описана функциональная и создана структурная схема измельчительной установки замкнутого цикла измельчения. Для описания процесса подачи материала используется модель бункера с учетом изменения площади его выходного отверстия. Процесс измельчения в рабочей зоне измельчения рассматривается как изменение концентрации материала в камере. При моделировании потока материала в классификаторе учитываются пульсации циркуляционной нагрузки в замкнутом цикле измельчения. Разработанная схема системы автоматического управления включает два уровня управления и описание объекта управления. Полученные результаты позволят качественно улучшить управление процессом измельчения.

Self-Compacting Concrete On The Basis Of Concrete Scrap Of Demolished Residential Buildings

When dismantling dilapidated buildings, a huge amount of concrete and reinforced concrete scrap is formed. The possibility of effective use of crushed concrete rubble and screening of its crushing as raw materials for self-compacting concrete is shown. The physical and mechanical properties of crushed concrete rubble are investigated. The use of a crushing dropout activated together with a polycarboxylate-based superplasticizer as a micro-filler in self-compacting concrete mixtures is also considered. The optimal content of the micro-filler in self-compacting concrete mixture is determined. The optimal grinding mode of the crushing dropout is set, due to the working conditions of the grinding equipment, to obtain the micro-filler of a given specific surface. The grain-size composition of mixture consisting of quartz sand and crushed concrete aggregate based on the maximum approximation condition to the reference Fuller's curve is designed. The mathematical-statistical method was used for the selection of the composition of self-compacting concrete with application of common structural argumentative characteristics determined by the end of the structure formation period. As these characteristics of self-compacting concrete, the volume concentration of the binder, which determines the macrostructure of concrete, and the true water-binder ratio, which has a decisive influence on the volume and nature of the pores in the cement stone, on the quality of the contact zone between the cement stone and the filler were adopted. Adequate polynomial mathematical models are obtained. They describe the properties of self-compacting concrete mix and concrete, and can also be used when designing their composition.

Mathematical model of surface roughness at a flat grinding by periphery of a circle of metal-polymer parts

This scientific work focused on determination grinding modes for metal polymer products that are filled aluminium. Also it is necessary to ensure required surface roughness and the highest performance. We used three factor planned experiment to get equation surface roughness metal polymer product at a flat grinding. The analysis and processing the results of the experiment was performed using statistical methods. Preparation of the products for experiments based on previously obtained scientific data. We used only calibrated measuring instrument for taking readings. In this scientific work was obtained the equation of surface roughness and table feed and cut depth at flat grinding of metal polymer products. Also it’s been got values of grinding modes of metal polymer surfaces on the joint of the molding tool, according to required surface quality. An obtained curve was built.Comparisons with common relationships are made. The scope of the results has been determined. The values of grinding modes for processing metal polymer surface on the joint of the molding tool based on surface roughness also given in the scientific work.

Theoretical aspects of energy consumption acoustic evaluation at the jet grinding

The objective of this work was to develop an acoustic method for evaluating energy consumption during the jet mill operation on the basis of the new generalized physical laws of material dispersion at it destruction. Theoretical explanation is given to the problem of energy consumption diminish in the mode of fine grinding. Dependences between the product dispersion and critical energy density in the course of destruction are described. The acoustic-emissive parameters of dispersion of the samples loaded by compression and results of acoustic estimation of the jet grinding are considered. Interrelation between the gas-jet mill performance and parameters impacting on the energy consumption are analyzed. Grounds are given for using a criterion of extremal control of the working process for maintaining maximal performance. An acoustic size effect of dispersion is formulated by the analogy with dynamic size effect of destruction (DSE). A new approach to evaluation of energy consumed by the jet mill is developed from positions of unity of nature and mechanism of the loaded body destruction with community of manifestation of physical laws of acoustic emission and effects of new surface formation on the destroyed particles. Leading role in the methodology of energy consumption evaluation is given to the coefficient gN (J/imp) of transformation of the consumed energy into acoustic radiation at optimal mode of the mill operations (at maximum performance), which is calculated as a ratio of the reduced work (energy) to the acoustic signal counts in the grinding zone. Current energy consumption ЕDt (J) for period Dt (s) of work is calculated with taking into account coefficient gN (J/imp) and average (for the interval Dt) acoustic activity (imp/s). It is possible to maintain minimum energy consumption at the jet grinding by the snap-acting control of jets loading up to the level of the measured acoustic activity in the grinding zone, at which a “conditionally permanent” value of coefficient gN can be achieved. The results of acoustic evaluation of effective surface energy at optimal grinding mode correspond to the range of estimation gs in the regularity of the DSE destruction. This fact confirms validity of the dispersion theory (including the acoustic size effect) use for evaluating current energy consumption in the course of the jet mill operation.

The efficiency analysis of the SH-25A ball drum mill when grinding industrial products of fossil fuels

The working characteristics of a laboratory ball drum mill during grinding of Karaganda coal products were studied in order to apply the results obtained to industrial installations. The performed analysis shows that the most complicated and energy-intensive stage of preparation of coal dust is the grinding of fuel. The operational characteristics of the mill productivity, consumed electric power and specific energy consumption in terms of the relative rotational speed of the drum as well as the optimal values of the relative velocity determining the qualitative grinding of the fuel have been determined. The performance of the processed drum mill reaches its maximum at a relative speed of rotation of the drum 0.71 ensuring a waterfall mode of grinding of fuel related to the high-speed mode of a coal-grinding mill. The estimated specific energy consumption for fuel grinding varies in the range from 0.11 kWh/kg up to 0.23 kWh/kg at fuel milling coefficient of Kl = 1.2.

THE EFFECT OF TEMPERATURE ON THE GRINDING SURFACE QUALITY RING ROLLER

A series of experimental researches was carried out in the work, which confirmed the results of modeling of temperature processes in the zone of centerless intermittent grinding of billet rings. The constructed response surfaces of the dependence of the roughness parameter Ra on the grinding modes and the number of grooves of the grinding wheel form the basis of the developed technique for designing grinding operations and tool adjustments of grinding machines. The contact area of ​​the abrasive circle with the workpiece is a narrow strip of rectangular shape that moves along the workpiece surface. In this case, the temperature field can be calculated according to the scheme of a moving infinitely long surface-band source. The plan, the program and the hardware of experimental researches of the connection of design and technological factors and indicators of grinding operations with parameters of quality of grinding surfaces, temperature of grinding, power parameters of the process of grinding by discontinuous grinding circles and constructive circles have been developed.

ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ СТРУМИННОГО ПОДРІБНЕННЯ НА ОСНОВІ АКУСТИЧНОГО МОНІТОРИНГУ ПРОЦЕСУ

Мета. Метою роботи є розробка шляхів підвищення ефективності струминного подрібнення на основі встановлення зв’язку продуктивності млина та якості продукту з характеристиками акустичних сигналів.Методика. Оптимізація процесу струминного подрібнення виконувалась з використанням аналізу акустичних сигналів робочих зон струминного млина. Для побудови залежностей технологічних і акустичних параметрів було використано статистичний аналіз експериментальних даних.Результати. Дослідження підтвердили залежність параметрів акустичних сигналів робочих зон від режиму подрібнення. Встановлено, що зміни максимальної і середньої амплітуди акустичних сигналів робочої зони в процесі подрібнення мають чітко виражений коливальний характер, що пов’язано зі зміною циркуляційного навантаження в робочій зоні. Показано, що відносна продуктивність млина, нормована рівнем завантаження камери подрібнення, змінюється в процесі подрібнення за квадратичним законом. В той же час, зміна максимальної і середньої амплітуди акустичних сигналів робочої зони в процесі подрібнення описується поліномом 4 порядку, при цьому величина середньої амплітуди акустичних сигналів робочої зони подрібнення в сталому режимі процесу є квадратичною функцією від відносної продуктивності за рівнем завантаження. Показано, що амплітуда акустичних сигналів характерної частоти, записаних в зоні за класифікатором, прямо пропорційна крупності часток готового продукту, що транспортується.Наукова новизна. Вперше науково обґрунтовано і експериментально підтверджено, що продуктивність струминного млина за рівнем завантаження матеріалом змінюється в процесі подрібнення за квадратичним законом. А залежність амплітуд акустичних сигналів зони подрібнення від відносної продуктивності носить поліноміальний характер.Практична цінність. Встановлення нових залежностей характеристик акустичних сигналів від технологічних параметрів дозволить підвищить ефективність струминного подрібнення на основі результатів акустичного моніторингу. Контроль продуктивності млина та якості продукції за величиною середньої амплітуди акустичних сигналів в робочих зонах установки дасть змогу знизити витрати енергії в технологічних процесах подрібнення для одержання тонкого і надтонкого матеріалу.