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Automating the Mold-Material Grinding Process

tangential grinding forces increase. However, when the total removal volume is 450 mm3/mm, the bending-vibration noise and the normal grinding force suddenly decrease and the tangential grinding force also decreases slightly. When the total removalvolumeis 500mm3/mm, the bending-vibration noise and normal and tangential

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Measuring vibration on precision grinding machines ...

Vibration forms. Common forms of vibration on grinding machines tend to fall into two categories – force vibration and self-excited vibration. Force vibration includes wheel imbalances, damaged bearings, bad motors, or grinding wheel imbalances. Force vibration can be present even when the grinding wheel is not in contact with the workpiece.

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Study on effect of ultrasonic vibration on grinding force ...

(2) Grinding forces can be significantly reduced (up to 65.6% of normal grinding force, up to 47.7% of tangential grinding force, and up to 42.2% of cross feed directional grinding force) by introducing ultrasonic vibration into micro end grinding of silica glass.

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Effects of grain size and concentration of grinding wheel ...

The purpose of this paper is to examine the effect of ultrasonic vibration on grinding force and surface roughness when the grain size and concentration of small cBN grinding wheel are changed. The experimental results indicate that applying ultrasonic vibration to the wheel decreases the normal and tangential grinding forces by more than 50% ...

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Material removal mechanism and grinding force modelling of ...

The tangential grinding force is obtained from the normal grinding force using the least square method. ... the effect of torsional vibration on grinding force and surface roughness under the same ...

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The Pennsylvania State University The Graduate School ...

1.6 Normal grinding force measured at a wheel speed of 2710 rpm, a depth of cut of 1.2 microns/rev, and traverse speed of 55 mm/min. The work speed was (a) 371 rpm, (b) 387 rpm, and (c) 403 rpm. . . 9

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Correlation analysis of motor current and chatter ...

and chatter vibration in grinding In the cylindrical grinding process, the grinding force can be decomposed into normal grinding force P n and tangential grinding force P t (figure 1). The tangential grinding force acts on the work piece and produces a load torque on the motor axis of the feed drive system.

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-(a) Grinding force ratio vs. specific material removal ...

P m is the grinding power required for removal rate, Q w the volumetric MRR, F t the tangential grinding force, v s the cutting speed, b w the contact width, v w the table feed rate, and a p the ...

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Advances in Mechanical Engineering 2017, Vol. 9(2) 1–7 ...

Effect of grinding grain size on grinding force. The statistical data of the grinding force in the process of ordinary machining and ultrasonic-aided high-speed machining are taken by dynamometer. The analysis of the grind-ing size of the tangential grinding force, Ft, and experi-mental data of normal grinding force, Fn, is shown in Figure 6 ...

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Feature extraction using frequency spectrum and time ...

the surface grinding process via digital processing of the vibration signals. Experimental tests were performed using a surface tangential grinding machine with a diamond grinding wheel and alumina (Al2O3) test specimens. The vibration signal was measured by an accelerometer and recorded by an oscilloscope at a 2 MHz sampling rate.

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Prediction of Tool Forces in Manual Grinding Using ...

Tool forces are a decisive parameter for manual grinding with hand-held power tools, which can be used to determine the productivity, quality of the work result, vibration exposition, and tool lifetime. One approach to tool force determination is the prediction of tool forces via measured operating parameters of a hand-held power tool. The problem is that the accuracy of tool force …

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Micromachines | Free Full-Text | A New Grinding Force ...

The ability to predict the grinding force for hard and brittle materials is important to optimize and control the grinding process. However, it is a difficult task to establish a comprehensive grinding force model that takes into account the brittle fracture, grinding conditions, and random distribution of the grinding wheel topography. Therefore, this study developed a new grinding …

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Grinding Superabrasive grinding process improvements via ...

The tangential grinding force is related to grinding spindle power as [3]: Grinding power (Watts) = Tangential Force (Newtons) x wheel velocity (m/s) Since power is directly proportional to tangential force, any increase in tangential force will be accompanied by larger forces acting on the individual grits and, in most cases, higher wheel wear.

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MAR 2 2 1985

Ft tangential grinding force Fn normal grinding force f, Pgrinding force in p direction fq grinding force in q direction k spring constant in p direction ... The relation between the tool vibration and the stiffness with which the tool is held is evaluated, and the optimal tool holder compliance is determined. ...

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Review of ultrasonic vibration-assisted machining in ...

Compared to CG, UVAG can reduce the normal grinding force by 4.2–20% and the tangential grinding force by 4.7–16%. Fu et al. Si 3 N 4 High strength over a wide temperature range Wear resistance Thermal shock resistance and chemical resistance, etc. Turbine blades Automobile industry and weld positioners, etc. R-UVAM

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series Balance Monitor series

Fn : Normal grinding force (50 N/V) Measured value = 187.5 N Ft : ˚Tangential grinding force (5 N/V) Measured value = 38.4 N Fn : Normal grinding force (50 N/V) Measured value = Approx. 214 N Grinding method Dry surface grinding, up cut Grinding wheel Diamond wheel with cast iron core (SD100N125M) O.D. 300 mm, width 16 mm I.D. 127 mm

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PSO PI Controller of Robotic Grinding Force Servo System

unimportance. The normal grinding force Fn has an affect on the workpiece roughness and the surface deformation, while the tangential grinding force Ft chiefly influences the consumption of power and providing the grinding wheel life [13]. Figure 1. Main parameters used in grinding policies Figure 2. Model of the grinding force servo system

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Development and performance of a novel ultrasonic ...

vibration plate sonotrode for grinding Yang Cao a, #, Yejun Zhu a, #, Hao Nan Li b, Chenxi Wang a, ... N Tangential grinding force vs m/s Grinding speed vw …

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HESSAM KALBASI SHIRVANI DESIGN MODELING AND …

A traverse grinding cut model is presented in succeeding chapter to show how this type of vibration can give rise to the grinding force value and make it unstable. The stability analysis for demonstration of the stability boundaries is presented, and the time domain cutting force in tangential and normal directions are presented numerically.

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System design and experimental research on the tangential ...

Effect of grinding parameters on the grinding force: (a) normal grinding force, (b) tangential grinding force Full size image It can be seen from Fig. 12 that the TUVAGG can significantly reduce the grinding force, as compared to the CGG: the normal and tangential grinding forces were reduced by 7.4–28.2% and 8.9–18.9%, respectively.

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NUMERICAL SIMULATION OF GRINDING FORCES BY SIMULINK

The tangential grinding force model and normal grinding force model are formulated on the Simulink, that is Eq(1) and Eq(2). The following 8 circuit diagram shows the tangential and normal grinding forces of the formulated circuit in Simulink, and check with experimental results (Jinyuan Tanga et al., 2009). Table 1: Experimental Data V s (m/s ...

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Study on Effect of Ultrasonic Vibration on Grinding Force ...

(2) Grinding forces can be significantly reduced (up to 65.6% of normal grinding force, up to 47.7% of tangential grinding force, and up to 42.2% of cross feed directional grinding force) by introducing ultrasonic vibration into micro end grinding of silica glass.

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A model for grinding forces prediction in ultrasonic ...

12%Ultrasonic vibration assisted grinding is an advanced method for machining difficult-to-process materials such as SiCp/Al composites. This paper presents a mechanics model for predicting grinding forces in ultrasonic vibration assisted grinding of SiCp/Al composites. It consists of side grinding force model and end grinding force model. …

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Study of Forces During Ultrasonic Vibration Assisted Grinding

1002 A.N. Unyanin and A.Sh. Khusainov / Procedia Engineering 150 ( 2016 ) 1000 – 1006 Cutting AGs are AGs located at the distance 0 ddy yl from the reference external surface of the grinding wheel, where y l is a function describing dependence of the depth y of AG location on the length l of its contact with the workpiece. We can calculate the component J mr1 by using multiple …

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Experimental study of single cubic boron nitride grains in ...

Under the same grinding conditions, the tangential grinding force, Ft, decreased slightly at ap = 10 µm, while the tangential grinding force decreased when ap = 15 µm. This shows that ultrasonic vibration assisted with a greater range of changes and space.

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Grindability of carbon fiber reinforced polymer using CNT ...

Under the MQL condition, the tangential grinding force was 3.55 N, the normal grinding force was 8.37 N, and the grinding force ratio was 0.423, thus indicating reductions of 19.86%, 11.43%, and 9 ...

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Effects of axial ultrasonic vibration on grinding quality ...

12%Through establishing the theoretical grinding force models for CPG and AUPG on Zerodur, Sun et al. [12, 13] analyzed the exact effect of axial ultrasonic vibration on the grinding force in AUPG. Furthermore, the normal and tangential forces were found to be reduced by 27.31% and 22.52%, respectively, through axial ultrasonic vibration, …

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Modeling of Tangential Vibrations in Cylindrical …

N the normal grinding force. The complete system dynamics equations consists of (5), (6) and (7). 3 Grinding contact forces The grinding forces will be described now. The normal and tangential grinding forces of the surface grinding case presented in [7] and [8] are used. It is assumed that it provides reliable accuracy and the

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Research Article Study on Effect of Ultrasonic Vibration ...

where # is grinding force per unit grinding area, which depends on material properties, ( ) is the grinding cross-sectionalarea, and is the coe cient of friction. Grinding cross-sectional area ( ) is proportional to ; that is, ( ) $ . er efore, assisted ultrasonic vibration, which leads to low average value of,istocutdownthe

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EP0843043A1 - Tangential grinding machine - Google Patents

A tangential grinding machine slidable on rails to be ground and comprising at least one support frame (9) for at least two tangential grinding wheels (42) for grinding a rail (6), wherein the two grinding wheels can traverse axially on opposite sides of the centre line of the rail to be ground and be inclined inwards with reference to the direction of advancement along the rail, each …

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Grinding Force - an overview | ScienceDirect Topics

Grinding force ratio is a parameter that gives indirect information about the efficiency of grinding. Force ratio is defined as: (2.8) μ = F t / F n grinding force ratio When grinding with sharp wheels grinding force ratio is high since normal force is low compared to tangential force.

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5.3: GRINDING FORCES, POWER, AND SPECIFIC ENERGY ...

5.3 GRINDING FORCES, POWER, AND SPECIFIC ENERGY. Forces are developed between the wheel and the workpiece owing to the grinding action. For plunge grinding operations, as illustrated in Figure 5-2 for straight surface and …

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