scholarly journals Development of a tool module for external intermittent grinding with the activation of the cutting fluid

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Alla Fesenko ◽  
Fatyma Yevsiukova ◽  
Olena Naboka
Keyword(s):  
Cutting Fluid ◽  
Grinding Wheel ◽  
Stable Operation ◽  
Cutting Zone

An instrumental module for external circular grinding has been developed, using methods of intermittent processing with replaceable abrasive bars with a combined supply of coolant through the pores of the bars and through the channels between them, with its activation in special cavitation nozzles. Is to develop a method for circular external inter-mittent grinding and a tool module that ensures stable operation of the wheel and efficient supply of cutting fluid to the cutting zone. The tool module of the assembling grinding wheel has been developed, which provides the effect of intermittent grinding with the supply of cutting fluid through the abrasive bars and the gap between them.

An Experimental Investigation on Thermal Conductivity and Viscosity of Graphene doped CNTs /TiO2 Nanofluid

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
A.M. Zetty Akhtar ◽  
M.M. Rahman ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Thermal Conductivity ◽  
Zeta Potential ◽  
Base Fluid ◽  
Minimum Quantity Lubrication ◽  
Cutting Fluid ◽  
Cutting Zone ◽  
Observation Method ◽  
The Stability ◽  
The Relationship ◽  
Zeta Potential Analysis

This paper presents the findings of the stability, thermal conductivity and viscosity of CNTs (doped with 10 wt% graphene)- TiO2 hybrid nanofluids under various concentrations. While the usage of cutting fluid in machining operation is necessary for removing the heat generated at the cutting zone, the excessive use of it could lead to environmental and health issue to the operators. Therefore, the minimum quantity lubrication (MQL) to replace the conventional flooding was introduced. The MQL method minimises the usage of cutting fluid as a step to achieve a cleaner environment and sustainable machining. However, the low thermal conductivity of the base fluid in the MQL system caused the insufficient removal of heat generated in the cutting zone. Addition of nanoparticles to the base fluid was then introduced to enhance the performance of cutting fluids. The ethylene glycol used as the base fluid, titanium dioxide (TiO2) and carbon nanotubes (CNTs) nanoparticle mixed to produce nanofluids with concentrations of 0.02 to 0.1 wt.% with an interval of 0.02 wt%. The mixing ratio of TiO2: CNTs was 90:10 and ratio of SDBS (surfactant): CNTs was 10:1. The stability of nanofluid checked using observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured at a temperature range between 30˚C to 70˚C (with increment of 10˚C) to determine the relationship between concentration and temperature on nanofluid’s thermal physical properties. Based on the results obtained, zeta potential value for nanofluid range from -50 to -70 mV indicates a good stability of the suspension. Thermal conductivity of nanofluid increases as an increase of temperature and enhancement ratio is within the range of 1.51 to 4.53 compared to the base fluid. Meanwhile, the viscosity of nanofluid shows decrements with an increase of the temperature remarks significant advantage in pumping power. The developed nanofluid in this study found to be stable with enhanced thermal conductivity and decrease in viscosity, which at once make it possible to be use as nanolubricant in machining operation.

Improvement in the performance with less stiff air layer formation around the rubber tube-pasted grinding wheel

2019 ◽  
Vol 233 (15) ◽  
pp. 5175-5189 ◽  
Author(s):  
Spandan Guha ◽  
Partha Protim Das ◽  
Shankar Chakraborty
Keyword(s):  
Cutting Speed ◽  
Cutting Fluid ◽  
Depth Of Cut ◽  
Grinding Wheel ◽  
Rubber Tube ◽  
Layer Formation ◽  
Relational Analysis ◽  
Grinding Performance ◽  
Roughness Amplitude ◽  
Grey Relational

In the grinding operation, a stiff layer of air gets formed around the periphery of the grinding wheel that causes deterioration of its performance. In the present work, in order to restrict the generation of stiff air layer around the periphery of the grinding wheel, a rubber tube is pasted on its surface to improve the grinding performance. An experimental investigation is carried out with low alloy steel as the work material. Taguchi's L9 orthogonal array is considered for the design of experiments while taking cutting speed, depth of cut, and type of the cutting fluid as the input grinding parameters. A comparative analysis using rubber tube-pasted grinding wheel and normal grinding wheel reveals that the developed wheel significantly improves the grinding performance with respect to surface roughness, amplitude of vibration and grinding ratio, as compared to the normal wheel. Moreover, grey relational analysis aided with fuzzy logic is applied in the experimental results to derive the optimal combination of process parameters for further enhancement of the grinding performance. Finally, analysis of variance results identify cutting speed as the most significant parameter while grinding with normal wheel, whereas depth of cut appears to be the most important parameter while machining with rubber tube-pasted grinding wheel.

Intensification of Finish Turning of Stainless Steels with the Use of Technological Cutting Fluids

2013 ◽  
Vol 371 ◽  
pp. 23-27
Author(s):  
Vadim Boguslavskiy ◽  
Tatiana Ivchenko ◽  
Viktor Polchenko ◽  
Iliya Navka
Keyword(s):  
Quantitative Estimation ◽  
Cutting Temperature ◽  
Cost Price ◽  
Cutting Fluid ◽  
Finish Turning ◽  
Cutting Zone ◽  
Definition Of ◽  
Cutting Regimes ◽  
The Cost ◽  
Further Development

The low workability of special brands corrosion-proof, heat resisting and high-resistance steels and alloys, widespread in details and nodes of modern machines, causes high labour input and the cost price of their manufacture. In this connection probes of possibilities of heightening of capacity and lowering of the cost price of handling of these materials at the expense of improvement of working conditions of the cutting instrument and, in particular, at the expense of application of various technological cutting fluid (TCF). High temperatures in a workpiece range, arising because of low heat conduction of intractable materials, define necessity of probe of the temperature phenomena for a cutting zone. The further development of a technique of definition of temperatures is of interest for these aspects of materials in a cutting zone at use ТСF and the account of their influence on a choice of optimum conditions of cutting. Researches of limitations on the roughness of the treated surface and cutting temperature are executed, in-use during optimization of cutting regimes at finish turning stainless materials, including with the use of technological cutting fluid. Analytical dependences of optimum cutting serve and speed from the parameters of finish turning process are set, providing the quantitative estimation of possibilities of the cutting regimes increase due to application of TCF. The estimation of efficiency of TCF application is executed on the basis of coefficient of increase of the treatment productivity.

scholarly journals Aerodynamic streams at cylindrical internal grinding by the textured wheels

2019 ◽  
Vol 298 ◽  
pp. 00018
Author(s):  
Vladimir Gusev
Keyword(s):  
Negative Impact ◽  
Radial Distance ◽  
Heat Removal ◽  
Movement Speed ◽  
Grinding Wheel ◽  
Internal Cavity ◽  
Axial Distance ◽  
Internal Grinding ◽  
Cutting Surface ◽  
Cutting Zone

During internal grinding a large amount of heat is formed. A heat has a negative impact on all processing indicators. The speed of heat removal from the processed workpiece is defined not only by structure of grinding wheel and by giving method of lubricant cooling liquid (LCL), but also by the aerodynamic streams, which are formed by a tool rotation. Aerodynamics of traditional grinding wheels is studied in detail, but for textured wheels to aerodynamic streams did not pay of due attention. The multiple-factor experiment is executed and models of movement speed of the aerodynamic streams are determined. It is established, that the greatest influence on the movement speed of the air flows has an axial distance of a measurement point from an end face of abrasive segments and a radial distance of this point from the cutting surface. Static pressure of air in an internal wheel’s cavity is equal 47 Pas, and outside of the wheel in close proximity to the cutting surface – 212 Pas. Taking into account the received experimental data of the movement speeds of aerodynamic streams and different data of air pressure in the specified areas, possible methods of giving of LCL in a cutting zone are analysed. It is established, that the most effective is the centrifugal method of giving of LCL to an internal cavity of the textured tool.

The Effect of Superheated Water Vapor as Coolant and Lubricant on Chip Formation of Difficult-to-Cut Materials in Green Cutting

2008 ◽  
Vol 375-376 ◽  
pp. 172-176 ◽  
Author(s):  
Rong Di Han ◽  
Yue Zhang ◽  
Yang Wang ◽  
Guo Fan Cao ◽  
Jie Liu
Keyword(s):  
Water Vapor ◽  
Chip Formation ◽  
Metal Cutting ◽  
Orthogonal Cutting ◽  
Contact Length ◽  
Cutting Fluid ◽  
Environment Friendly ◽  
Cutting Zone ◽  
On Chip ◽  
Deformation Coefficient

Green cutting is ecologically desirable and have been a tendency in the industry field. Water vapor can be introduced in metal cutting as coolant and lubricant due to its pollution-free, generating easily and unneeded disposal. Therefore, water vapor is an environment-friendly coolant and lubricant in machining. This study attempts to understand the effect of water vapor as coolant and lubricant on chip formation. In the comparison experiments to dry and wet cutting, water vapor jet flow from a developed generator is applied into cutting zone directly. When YG8 (K20 in ISO) tools are used to turn titanium alloy TC4 (Ti-6Al-4V), Ni-based super alloy GH3030 and stainless steel 1Cr18Ni9Ti in orthogonal cutting, through quick-stop tests, the photos of polished chip sections microstructure were obtained. And the results suggest that the application of water vapor produces the least BUE, tool-chip contact length but the largest deformation coefficient and shear angle. The water vapor as coolant and lubricant could be a substitution of cutting fluid to carry out green cutting in the machining of difficult-to-cut materials.

scholarly journals Analysis of Machining Operation using Vegetable Oil and Nano Fluids

2021 ◽  
pp. 380-386
Author(s):  
Mr. Pratap R. Sonawane ◽  
Dr. Rahul B. Barjibhe
Keyword(s):  
Heat Transfer ◽  
Titanium Oxide ◽  
Production Costs ◽  
Nano Particles ◽  
Cutting Fluid ◽  
Nano Lubricant ◽  
Feasible Alternative ◽  
Cutting Zone ◽  
Steel Turning ◽  
Nano Fluids

The influence of the hybrid additives of alumina and titanium oxide on varied lubricant characteristics as a cut fluid in steel turning. In varied volumetric concentrations, the hybrid nano lubricant has to evolve. The mixture of alumina and titanium oxide improved its tribology. The new nano-lubricant reduces the wear and nodal temperature of the tool's flank substantially. The application of hybrid nano-particles rather than nano-particles is among the most significant jobs in improving the heat transfer of fluids. We saw several sorts of pairs used to cut fluid and their effects on machining (turning).A potential MQL approach can be tested to limit the excessive use of traditional cutting fluid. The minimum amount of any cutting fluid in this approach is sprayed into the cutting zone at high pressure to improve its penetration into the machining area. Using MQL enhances surface quality and the life of the tool. MQL is a feasible alternative to wet machining. In their perspective. Therefore, both production costs and environmental dangers may be minimized through MQL..

scholarly journals Effect of Minimum Quantity Lubrication System for Improving Surface Roughness in Turning Operation

2021 ◽  
Vol 6 (1) ◽  
pp. 50-59
Author(s):  
Shazzad Hossain ◽  
Mohammad Zoynal Abedin
Keyword(s):  
Surface Roughness ◽  
Minimum Quantity Lubrication ◽  
Numerical Data ◽  
Cutting Parameters ◽  
Cutting Fluid ◽  
Turning Operation ◽  
Minimum Quantity ◽  
Dimensional Deviation ◽  
Optimum Cutting ◽  
Cutting Zone

Due to increase in temperature at the cutting zone, the tool wear and surface roughness along with the non-uniform chip formation and the dimensional deviation of the job by using the conventional cutting fluid, the machining operation experts have directed their concentrations in order to achieve a smooth machining operation by using minimum quantity lubrication (MQL). As a consequence, numerous efforts can be seen for not only having the optimum cutting parameters but also other parameters that enhance the product quality and the surface roughness. In this regard, relevant experimental and numerical data outcomes not only MQL but also conventional cutting fluid (CCF) in the turning operation of 50HRC steel has been investigated experimentally. It is revealed that the surface roughness becomes optimal and significantly reduced for the condition of MQL with that of dry and conventional flood lubrication.

scholarly journals Grinding burns in the technological surface of the gear teeth of the cylindrical gears

Mechanik ◽  
2017 ◽  
Vol 90 (10) ◽  
pp. 882-884
Author(s):  
Tadeusz Zaborowski ◽  
Ryszard Ochenduszko
Keyword(s):  
Grain Size ◽  
Tooth Surface ◽  
Grinding Wheel ◽  
Gear Teeth ◽  
Cylindrical Gears ◽  
Number Of Teeth ◽  
Heat Effects ◽  
Cutting Zone

The article presents the results of research on the grinding of the technological grinding of the tooth surface of toothed wheel cylinders. The toothed teeth with straight teeth, modules m = 2÷6 mm, bore width b = 26÷94 mm, number of teeth with z = 12÷48 made of 40H and 12H2N4A steel with a hardness of 60 HRC. For grinding, T1Q grinding wheel has the following parameters: D = 350 mm, H = 25 mm, δ = 140°, grains 99A, grain size 60, hardness H, structure 5, binder V. The results of tests show the dependence of grinding scales on the parameters used machining and thickness of the sliced layer and this means the heat effects in the cutting zone.

scholarly journals INFLUENCE OF THE GEOMETRIC CHARACTERISTICS OF THE DISCONTINUOUS PROFILE WORKING SURFACES OF ABRASIVE WHEELS FOR PRECISION AND TEMPERATURE WHEN GRINDING

2021 ◽  
pp. 115-125
Author(s):  
Oleksiy Yakimov ◽  
Liubov Bovnegra ◽  
Vladimir Tonkonogyi ◽  
Vladyslav Vaysman ◽  
Victor Strelbitskyi ◽  
...  
Keyword(s):  
Surface Layer ◽  
Heat Stress ◽  
Elastic System ◽  
Dynamic Interaction ◽  
Grinding Wheel ◽  
Stable Operation ◽  
Grinding Process ◽  
Abrasive Wheel ◽  
Working Surface

Grinding is the most common finishing method for hardened steel parts. Grinding is accompanied by a large heat release in the cutting area, under the influence of which structural changes appear in the thin surface of the processed parts, tensile stress and even microcracks, which significantly reduce the operational reliability of machines that include these parts. The use of abrasive wheels with an intermittent working surface makes it possible to reduce the temperature in the area of contact of abrasive grains with the material of the workpiece and, as a consequence, stabilize the quality of the surface layer of the workpieces. High-frequency vibrations in the elastic system of the machine, accompanying the work of an intermittent wheel, are a positive factor that reduces the energy consumption of the grinding process. However, under certain conditions of dynamic interaction of the tool with the workpiece, parametric resonance may occur, which worsens the geometric and physical-mechanical parameters of the quality of the surface layer of the processed part. The aim of the work is to realize the possibility of predicting the quality parameters of the surface layer of parts during intermittent grinding by studying the influence of the design features of the macrotopography of the working surface of abrasive wheels and processing modes on the nature of the dynamic interaction of the tool with the workpiece and the heat stress in the cutting area. It was found that the parametric vibrations of the elastic system of the machine tool can be shifted to a more stable area, due to an increase in the number of interruptions of the working surface of the abrasive wheel with a constant ratio of the length of the protrusions and depressions. The increase in the number of breaks on the wheel also contributes to a decrease in temperature in the cutting area. It was found that to maintain the stable operation of the elastic system of the machine, it is necessary to reduce the number of cavities on the grinding wheel with an increase in the cutting speed. However, both of these actions are accompanied by an increase in the heat stress of the grinding process. It has been experimentally established that for ordinary (pendulum) grinding, it is possible to achieve an increase in processing productivity by increasing the speed of the longitudinal movement of the table.

Caprolon turning with the supply of a water repellent emulsion to the cutting zone

2021 ◽  
Author(s):  
Keyword(s):  
Surface Roughness ◽  
Water Absorption ◽  
Chip Formation ◽  
Cutting Fluid ◽  
Water Repellent ◽  
Machined Surface ◽  
Water Emulsion ◽  
Cutting Zone

The turning of caprolon with the use of cutting fluid is investigated. It is established that when turning with a simultaneous supply of a water emulsion of a water repellent to the cutting zone, the water absorption of caprolon decreases and the quality of the machined surface increases. Keywords: caprolon, turning, water absorption, water repellent emulsion, surface roughness, chip formation. [email protected]

Sign in / Sign up

Export Citation Format

Share Document