The Effect of Some Operating Variables in Vertical Spindle Abrasive Machining of Mild Steel

1967 ◽  
Vol 89 (2) ◽  
pp. 323-327 ◽  
Author(s):  
C. Pollock
Keyword(s):  
Wear Rate ◽  
Feed Rate ◽  
Metal Removal ◽  
Removal Rate ◽  
Vertical Displacement ◽  
Practical Significance ◽  
Metal Removal Rate ◽  
Wheel Wear ◽  
Grinding Ratio ◽  
Power Curves

This paper reports the results of a systematic test program designed to determine the effect of work area, downfeed rate, and segment grade on performance on vertical spindle surface grinders. Metal removal rate is shown to be a function of volumetric feed rate only. Wheel wear rate is shown to be a linear function of volumetric feed rate with the slope of each line a function of workpiece area. It is also shown that the effect of segment grade is to vertically displace the metal removal rate, wheel wear rate, grinding ratio, and power curves. The vertical displacement of the metal removal rate, wheel wear rate, and grinding ratio becomes progressively less as the hardness of the segment increases. The effect is reversed for power. The practical significance and application of this information are also discussed, showing examples of how it can be applied to solve certain general problems.

Factors Influencing the Performance of Grinding Wheels

1959 ◽  
Vol 81 (3) ◽  
pp. 187-199 ◽  
Author(s):  
E. J. Krabacher
Keyword(s):  
Metal Removal ◽  
Removal Rate ◽  
Grinding Wheel ◽  
Metal Removal Rate ◽  
Grinding Wheels ◽  
Wheel Wear ◽  
Grinding Wheel Wear ◽  
Grinding Ratio ◽  
Material Hardness ◽  
Chip Load

Optimum utilization of grinding wheels can best be achieved if the nature of their performance and wear characteristics, and the factors that affect these characteristics, are understood and applied. As reported in this paper, a comprehensive, continuing, grinding-research program has contributed to such an understanding. A study of the nature of grinding-wheel wear indicates that the grinding-wheel wear curve is similar to those of other cutting tools. It demonstrates further that the type of grinding operation significantly affects the nature of wheel wear. A unique technique has been developed for very accurately measuring grinding-wheel wear. This measured wear may be translated into terms of “grinding ratio,” which is the generally accepted parameter for measuring wheel wear. It is the ratio of the volume of metal removed per unit volume of wheel worn away. Extensive studies have been carried out to determine the effect of mechanical variables on grinding ratio, power required in metal removal, and on surface finish. Experimental findings indicate that grinding ratio decreases with increased metal-removal rate and increases with workpiece diameter, decreased chip load, and increased concentration of grinding fluid. Power is found to increase with both the metal-removal rate and the amount of metal removed. It increases slightly with workpiece diameter and is affected little by work-material hardness. Surface finish is found to improve with decreased metal-removal rate and decreased chip load. It also is affected little by work diameter or work-material hardness. Fundamental research in the mechanics of wheel wear is supplying much additional information in the study of grinding-wheel wear. The measurement of grinding forces employing a cylindrical grinding dynamometer provides the opportunity for relating the wear of grinding wheels to the basic mechanics of the process through such fundamental quantities as grinding forces, specific energy, and grinding friction. Two additional experimental techniques for the study of chip formation in grinding have also proved to be most useful research tools. A “quick-stop” apparatus is used to freeze the grinding action by accelerating a tiny workpiece almost instantaneously to grinding-wheel speed. Another technique permits the comparison of the shape of the grinding grit and that of the contour of its path through the workpiece by a unique replicating method.

Investigation the Electrode Wear Rate and Metal Removal Rate in EDM Process using Taguchi and ANOVA Method

2020 ◽  
Vol 38 (10A) ◽  
pp. 1504-1510
Author(s):  
Safaa K. Ghazi
Keyword(s):  
Wear Rate ◽  
Metal Removal ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Electrode Wear ◽  
Metal Removal Rate ◽  
Electrode Wear Rate ◽  
Pulse On Time ◽  
Pulse Off Time ◽  
Off Time

The experimental work of this paper leads to electrical discharge machining (EDM). A system for machining in this process has been developed. Many parameters are studied such as current, pulse on-time, pulse off time of the machine. The main aim of this work is to calculate the metal removal rate (MRR) and electrode wear rate (EWR) using copper, electrodes when machining tool steel H13 specimens of a thickness (4mm). Different current rates are used ranging from (30, 42, and 54) Amp, pulse on-time ranging from (75, 100, and 125) and pulse off time ranging from (25, 50, and 75)   found that high current gives large electrode wear and metal removal rate and. The experiment design was by Taguchi Method. From an analysis of variance (ANOVA) the more active influence of input factors on the outputs is currently for metal removal rate (MRR) (58%) and electrode wear rate (EWR) (57).

Variables Influencing Degradation of SiC Abrasive Papers

1978 ◽  
Vol 100 (4) ◽  
pp. 501-507 ◽  
Author(s):  
Junji Sugishita ◽  
Takashi Imura ◽  
Syonoshin Fujiyoshi
Keyword(s):  
Fatigue Strength ◽  
Wear Rate ◽  
Base Metal ◽  
Frictional Force ◽  
Metal Removal ◽  
Removal Rate ◽  
Load Condition ◽  
Metal Removal Rate ◽  
Force Amplitude ◽  
Low Load

Using a reciprocating friction machine in which different loads and different speeds for each stroke, the rate of detached grits separated from cementing resin base, metal removal rate and mean sizes of detached grits were investigated under various friction conditions. The degradation of 600-grade SiC abrasive papers were discussed in terms of fatigue deformation of cementing resin. Main results are: 1) Under the reciprocating friction, the rate of detached grits increased in proportion to frictional force amplitude under low load condition. 2) In comparison between one-way friction and the reciprocating, higher wear rate were obtained under the reciprocating. It is considered to be a difference of fatigue strength of the resin for completely reversed stress and pulsating stress.

The Wheel Wear and Metal Removal Mechanisms in Vertical Spindle Abrasive Machining of Mild Steel

1968 ◽  
Vol 90 (2) ◽  
pp. 365-369 ◽  
Author(s):  
C. Pollock
Keyword(s):  
Metal Removal ◽  
Removal Rate ◽  
Metal Removal Rate ◽  
Abrasive Machining ◽  
Wheel Wear ◽  
Bond Failure ◽  
Primary Metal ◽  
Removal Mechanisms ◽  
Metal Chips ◽  
Secondary Mechanism

The primary metal removal mechanisms in vertical spindle abrasive machining are chip removal by firmly bonded abrasive grains in the wheel matrix, and secondary removal by the reuse of loose abrasive between the wheel-work interface. As you increase the strength (go to harder grades) of segments, the secondary metal removal rate tends to remain constant. However, the metal removed by firmly bonded abrasive increases rapidly. Changing from an E to an F grade approximately doubles the primary metal removal rate. Segmental wheels sharpen themselves by two major mechanisms—primary and secondary wear. Primary wear is caused by the common mechanisms of attrition, grain fracture, and bond failure. The secondary mechanism is caused by loose abrasive and metal chips in the wheel-work interface.

Parameter Optimization of the Steel Grinding Process

1976 ◽  
Vol 98 (3) ◽  
pp. 1048-1052 ◽  
Author(s):  
R. W. Mayne ◽  
S. Malkin
Keyword(s):  
Metal Removal ◽  
Removal Rate ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Metal Removal Rate ◽  
Wheel Wear ◽  
Trade Off ◽  
Grinding Wheel Wear ◽  
Grinding Performance ◽  
Nonlinear Programming Methods

This paper is concerned with the application of nonlinear programming methods to the surface grinding of steels and considers the specific case of plunge grinding. Performance equations based on a model of the process are presented and then optimized. Trade-off curves are established showing the best metal removal rate possible for given constraints on surface quality and at specified conditions of grinding wheel wear. Optimum values for the various parameters in the grinding process are also included. In addition, the sensitivity of steel grinding performance to nonoptimum choices of grinding wheel velocity and diameter is considered.

scholarly journals An Experimental Investigation on Micro Drilling of Cold Work Steel X153CrMoV12 By EDM

2021 ◽  
Author(s):  
FERHAT CERİTBİNMEZ ◽  
Erdoğan Kanca
Keyword(s):  
Surface Roughness ◽  
Wear Rate ◽  
Metal Removal ◽  
Removal Rate ◽  
Cold Work ◽  
Process Quality ◽  
Electrode Wear ◽  
Machining Parameters ◽  
Metal Removal Rate ◽  
Machining Time

Abstract In this study, it was aimed to analyze the effects of machining parameters on the process quality by drilling holes in heat treated cold work tool steel with a hardness of 60-62 HRC using the electrical discharge machining (EDM) method and Ø2 mm diameter brass electrodes. In this context, drilling was performed using three different current values ​​(5, 6, 7 A), three different voltage values ​​(1, 2, 3 V), three different discharge pulse frequency Ton (23, 26, 29 µs) as well as Toff (3, 5 µs) respectively, and the effects of these machining parameters on the machining time, material removal rate (MRR), electrode wear rate (EWR), surface roughness (SR) and hardness of around the white layer were analyzed using micro, macro and analytical measurements, especially with Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDX). As a result of the analysis, ıt was observed that current, voltage, Ton and Toff had an effect on machining time, MRR, EWR, SR and hardness, but current was the most effective parameter, and also worn electrode as well as workpiece residues affected the process quality. Increasing the machining current increased sparking between the workpiece and the electrode, resulting in increased point melting and evaporation, resulting in increased average surface roughness, metal removal rate, and electrode wear rate. As a result of the high metal removal rate, the machining time was greatly reduced and the thermal effect time was reduced, which led to a decrease in the hardness variation on the machined surfaces.

Quantification of tool chatter and metal removal rate using wavelet denoising and statistical approach

2018 ◽  
Vol 49 (2) ◽  
pp. 62-81 ◽  
Author(s):  
Shailendra Kumar ◽  
Bhagat Singh
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Metal Removal ◽  
Removal Rate ◽  
Statistical Significance ◽  
Depth Of Cut ◽  
Machining Parameters ◽  
Metal Removal Rate ◽  
Chatter Index ◽  
Tool Chatter

Tool chatter is an unavoidable phenomenon encountered in machining processes. Acquired raw chatter signals are contaminated with various types of ambient noises. Signal processing is an efficient technique to explore chatter as it eliminates unwanted background noise present in the raw signal. In this study, experimentally recorded raw chatter signals have been denoised using wavelet transform in order to eliminate the unwanted noise inclusions. Moreover, effect of machining parameters such as depth of cut ( d), feed rate ( f) and spindle speed ( N) on chatter severity and metal removal rate has been ascertained experimentally. Furthermore, in order to quantify the chatter severity, a new parameter called chatter index has been evaluated considering aforesaid denoised signals. A set of 15 experimental runs have been performed using Box–Behnken design of experiment. These experimental observations have been used to develop mathematical models for chatter index and metal removal rate considering response surface methodology. In order to check the statistical significance of control parameters, analysis of variance has been performed. Furthermore, more experiments are conducted and these results are compared with the theoretical ones in order to validate the developed response surface methodology model.

Multiresponse Optimization of Al Alloy-SiC Composite Machining Parameters for Minimum Tool Wear and Maximum Metal Removal Rate

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Rajesh Kumar Bhushan
Keyword(s):  
Tool Wear ◽  
Metal Removal ◽  
Removal Rate ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Al Alloy ◽  
Machining Parameters ◽  
Metal Removal Rate ◽  
Nose Radius ◽  
Multiresponse Optimization

Optimization in turning means determination of the optimal set of the machining parameters to satisfy the objectives within the operational constraints. These objectives may be the minimum tool wear, the maximum metal removal rate (MRR), or any weighted combination of both. The main machining parameters which are considered as variables of the optimization are the cutting speed, feed rate, depth of cut, and nose radius. The optimum set of these four input parameters is determined for a particular job-tool combination of 7075Al alloy-15 wt. % SiC (20–40 μm) composite and tungsten carbide tool during a single-pass turning which minimizes the tool wear and maximizes the metal removal rate. The regression models, developed for the minimum tool wear and the maximum MRR were used for finding the multiresponse optimization solutions. To obtain a trade-off between the tool wear and MRR the, a method for simultaneous optimization of the multiple responses based on an overall desirability function was used. The research deals with the optimization of multiple surface roughness parameters along with MRR in search of an optimal parametric combination (favorable process environment) capable of producing desired surface quality of the turned product in a relatively lesser time (enhancement in productivity). The multi-objective optimization resulted in a cutting speed of 210 m/min, a feed of 0.16 mm/rev, a depth of cut of 0.42 mm, and a nose radius of 0.40 mm. These machining conditions are expected to respond with the minimum tool wear and maximum the MRR, which correspond to a satisfactory overall desirability.

Optimization of MRR and Surface Roughness of AlMg3 (AA5754) Alloy in CNC Lathe Machine by Using Taguchi Method

2018 ◽  
Vol 877 ◽  
pp. 110-117 ◽  
Author(s):  
Poornesh Kumar Chaturvedi ◽  
Harendra Kumar Narang ◽  
Atul Kumar Sahu
Keyword(s):  
Surface Roughness ◽  
Taguchi Method ◽  
Metal Removal ◽  
Removal Rate ◽  
Surface Condition ◽  
Point Of View ◽  
Depth Of Cut ◽  
Metal Removal Rate ◽  
Cnc Lathe ◽  
Lathe Machine

Quality of the product is the major concern in manufacturing industries from customers as well as producers point of view. There are number of factors in the product such as surface condition, height, weight, length, width etc., which may be consider for the measurement of the quality. Surface roughness and Metal Removal Rate (MRR) are the two main outcomes on which numerous researchers have applied different approaches for several years to get optimum results. In this study, Taguchi Method is applied for getting optimum parameters settings for Surface roughness and Metal Removal Rate (MRR) in case of turning AlMg3 (AA5754) in CNC Lathe machine, which is an aluminum alloy having diameter 20 mm and length 100 mm. The three parameters i.e. spindle speed, feed rate and depth of cut with 3 levels are taken as the process variables and the working ranges of these parameters for conducting experiments are selected based on Taguchi’s L9 Orthogonal Array (OA) design. To analyze the significant process parameters; main effect plots for data means and for S/N ratio are generated using Minitab statistical software.

Effect of the Al2O3 powder addition on the metal removal rate and the surface roughness of the electrochemical grinding machining

2020 ◽  
Vol 234 (12) ◽  
pp. 1538-1548 ◽  
Author(s):  
Hossam M Yehia ◽  
Mohamed Hakim ◽  
Ahmed El-Assal
Keyword(s):  
Surface Roughness ◽  
Metal Removal ◽  
Removal Rate ◽  
Lower Surface ◽  
Maximum Effect ◽  
Metal Removal Rate ◽  
Powder Addition ◽  
Different Depths ◽  
Electrochemical Grinding ◽  
Better Than

The integrated electrochemical grinding machining has received wide acceptance in the aircraft turbine industry for the machining of blades, vanes, and honeycomb seal rings. Also, medical devices, instruments and forceps, shells, precision nozzles, instrument coupling, and air rotor motors that produced from stainless steel and new materials have all successfully been accomplished with electrochemical grinding. To improve the metal removal rate and to reduce the surface roughness ( Ra) of the electrochemical grinding at high voltages, an integration between the alumina abrasive jet and the electrochemical grinding machining has been performed. The effect of the Al2O3 abrasive content on the metal removal rate and the Ra of the K110 alloy steel using Everite electrochemical grinding 618 at different voltages, different feed rates, different electrolyte NaCl concentrations, and different depths of the cut were successfully investigated. The results revealed that the abrasive electrochemical grinding was better than the electrochemical grinding results. The maximum effect of the Al2O3 on the metal removal rate was achieved at 5 wt.%. The current density in the machining gap was affected by the addition of the Al2O3, where it was decreased at percentages over 5-wt.% Al2O3. The abrasive electrochemical grinding resulted in lower surface roughness than the electrochemical grinding process.

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