Effects of Grain Size and Operating Parameters on the Mechanics of Grinding

1972 ◽  
Vol 94 (3) ◽  
pp. 833-842 ◽  
Author(s):  
S. Kannappan ◽  
S. Malkin
Keyword(s):  
Grain Size ◽  
Specific Energy ◽  
Energy Input ◽  
Unit Area ◽  
Grinding Wheel ◽  
Operating Parameters ◽  
Specific Cutting Energy ◽  
Cutting Energy ◽  
G Ratio ◽  
Table Speed

An investigation is described of the effects of grain size and operating parameters on the mechanics of grinding. Results indicate that the specific cutting energy in grinding, which is the total specific grinding energy minus the specific energy due to sliding between the wear flats and the workpiece, is independent of grain size and decreases with increasing table speed and downfeed. It is postulated that the specific cutting energy consists of chip forming energy which is independent of table speed and downfeed, and plowing energy which decreases with increasing table speed and downfeed. Results for G-ratio, surface finish, and burning conditions are also presented. Of particular interest are the effects of grain size on burning conditions. With finer grain size, burning occurs at larger wear flat area and energy input per unit area ground, but the G-ratio and grinding wheel tool life are less. This is related to increased attritious wear with finer grains.

scholarly journals Experimental technique to analyze the influence of cutting conditions on specific energy consumption during abrasive metal cutting with thin discs

2021 ◽  
Author(s):  
Muhammad Rizwan Awan ◽  
Hernán A. González Rojas ◽  
José I. Perat Benavides ◽  
Saqib Hameed
Keyword(s):  
Energy Consumption ◽  
Energy Dissipation ◽  
Experimental Technique ◽  
Specific Energy ◽  
Material Removal ◽  
Metal Cutting ◽  
Specific Energy Consumption ◽  
Specific Cutting Energy ◽  
Cutting Power ◽  
Cutting Energy

AbstractSpecific energy consumption is an important indicator for a better understanding of the machinability of materials. The present study aims to estimate the specific energy consumption for abrasive metal cutting with ultra-thin discs at comparatively low and medium feed rates. Using an experimental technique, the cutting power was measured at four predefined feed rates for S235JR, intermetallic Fe-Al(40%), and C45K with different thermal treatments. The variation in the specific energy consumption with the material removal rate was analyzed through an empirical model, which enabled us to distinguish three phenomena of energy dissipation during material removal. The thermal treatment and mechanical properties of materials have a significant impact on the energy consumption pattern, its corresponding components, and cutting power. Ductile materials consume more specific cutting energy than brittle materials. The specific cutting energy is the minimum energy required to remove the material, and plowing energy is found to be the most significant phenomenon of energy dissipation.

scholarly journals Specific cutting energy consumption in a circular saw for Eucalyptus stands VM01 and MN463

CERNE ◽  
2011 ◽  
Vol 17 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Erica Moraes de Souza ◽  
José Reinaldo Moreira da Silva ◽  
José Tarcísio Lima ◽  
Alfredo Napoli ◽  
Túlio Jardim Raad ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Specific Energy ◽  
Feed Rate ◽  
Specific Energy Consumption ◽  
Cutting Speed ◽  
Machining Parameters ◽  
Specific Cutting Energy ◽  
Cutting Energy ◽  
Circular Saw ◽  
Cutting Speeds

Modern technologies for continuous carbonization of Eucalyptus sp. require special care in wood cutting procedures. Choosing the right tool, cutting speeds and feed rates is important to manage time and energy consumption, both of which being critical factors in optimizing production. The objective of this work is to examine the influence of machining parameters on the specific cutting energy consumption of Eucalyptus sp. stands MN 463 and VM 01, owned by V&M Florestal. Tests were performed at the Wood Machining Laboratory of the Federal University of Lavras (DCF/UFLA). Moist logs 1.70m in length were used. The experiment was set up using a 3 x 3 x 4 x 2 factorial design (cutting speed x feed rate x number of teeth x tree stand). Results were subjected to analysis of variance and means were compared by the Tukey test at the 5% significance level. Greater cutting speeds, lower feed rates and the 40 teeth circular saw consumed more specific energy. Stand MN 463 consumed more specific energy. The combination of cutting speed 46 m.s-1, feed rate 17 m.min-1 and 24 teeth circular saw produced better specific energy consumption results for stand MN 463. As for stand VM 01, the combination of cutting speed 46 m.s-1, feed rate 17 m.min-1 and 20 teeth circular saw resulted in lower specific energy consumption.

Milling Parameter Selection to Lower Specific Cutting Energy During Machining of Alloy Steels

2020 ◽  
Author(s):  
Sudeep Kumar Singh ◽  
Adarsha Arijit Sahoo ◽  
Biswojit Pattnayak ◽  
Biswo Bhushan Tarai ◽  
A.M. Mohanty
Keyword(s):  
Parameter Selection ◽  
Specific Cutting Energy ◽  
Cutting Energy ◽  
Alloy Steels

scholarly journals Grain-based DEM for Particle Bed Comminution

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 306
Author(s):  
Michael Klichowicz ◽  
Holger Lieberwirth
Keyword(s):  
Grain Size ◽  
Discrete Element Method ◽  
Specific Energy ◽  
Coarse Particles ◽  
Full Understanding ◽  
Real Experiment ◽  
Helpful Tool ◽  
Ore Processing ◽  
Comminution Process ◽  
Particle Bed

The comminution at the grain size level for liberating the valuable minerals usually requires the highest size-specific energy. Therefore, a full understanding of the comminution process at this level is essential. Models based on the Discrete Element Method (DEM) can become a helpful tool for this purpose. One major concern, however, is the missing representativeness of mineral microstructures in the simulations. In this study, a method to overcome this limitation is presented. The authors show how a realistic microstructure can be implemented into a particle bed comminution simulation using grain-based models in DEM (GBM-DEM). The improved algorithm-based modeling approach is exemplarily compared to an equivalent real experiment. The simulated results obtained within the presented study show that it is possible to reproduce the interfacial breakage observed in real experiments at the grain size level. This is of particular interest as the aim of comminution in mineral processing is not only the size reduction of coarse particles, but often an efficient liberation of valuable components. Simulations with automatically generated real mineral microstructures will help to further improve the efficiency of ore processing.

Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials

2007 ◽  
Vol 24-25 ◽  
pp. 229-232
Author(s):  
S.L. Ma ◽  
Wei Li ◽  
Cong Rong Zhu ◽  
J. Zhang ◽  
H.C. Ye
Keyword(s):  
Grain Size ◽  
Cast Iron ◽  
Tungsten Carbide ◽  
Surface Quality ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Different Grain Size ◽  
Grinding Efficiency ◽  
Machining Properties

Tungsten carbide which is a hard and brittle material was ground by cast-iron bonded diamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of getting high efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels with different grain size were adopted to get different grinding efficiency and surface quality of workpieces. The grinding properties of cast-iron bonded grinding wheels with different grain size and the ground surface quality of tungsten carbide are discussed in this paper. The experiment results indicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grain size is higher, and it could make the dimension accuracy of the workpiece controllable, but the wheel with smaller grain size could get better ground surface quality. The two grinding phases are decided by the ratio between the size of abrasive grain and the thickness of the oxide layer on the grinding wheel.

Comparison of Rotary and Linear Cutting Methodology in Determining Specific Cutting Energy of Granite

2021 ◽  
pp. 1-19
Author(s):  
Aamer Kazi ◽  
Yi-Tang Kao ◽  
Bruce Tai
Keyword(s):  
Linear Method ◽  
Cutting Speed ◽  
Polycrystalline Diamond ◽  
Specific Cutting Energy ◽  
Cnc Machine ◽  
Cutting Method ◽  
Cutting Energy ◽  
The Difference ◽  
Geothermal Drilling ◽  
Chip Load

Abstract Single polycrystalline diamond compact (PDC) cutting is a practical technique to understand the rock-tool interactions in drag-bit type geothermal drilling operations. This paper introduces a rotary cutting method to determine specific cutting energy (SCE) and compares it with the conventional linear cutting method. In this work, granite is selected to represent hard rock formations in geothermal drilling. Cutting tests are conducted on a CNC machine with a realistic cutting speed of 12.7 m/min and several chip loads ranging from 0.08 to 0.25 mm. The cutting force is measured using a dynamometer, and then converted to SCE. The results show that the rotary method produces an inverse relationship between SCE and chip load, whereas the linear method shows the opposite. As a result, the produced SCE by the rotary method tends to be lower than that of the linear method at a higher chip load at and over 0.16 mm. The difference may be attributed to the cutting configuration and associated force components.

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