Effect of Workpiece Flatness and Surface Finish on the Holding Force of a Magnetic Chuck

1999 ◽  
Vol 121 (4) ◽  
pp. 811-814 ◽  
Author(s):  
A. Felix ◽  
S. N. Melkote
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Surface Finish ◽  
Surface Texture ◽  
Hardened Steel ◽  
Ferromagnetic Materials ◽  
Precision Grinding ◽  
Workpiece Surface ◽  
Surface Flatness ◽  
Effect Of Surface

Magnetic chucks are commonly used for workholding in precision grinding and turning of ferromagnetic materials. The workholding force produced by the chuck is strongly influenced by the texture and form of the workpiece surface in contact with the chuck surface. This paper presents the results of an experimental investigation into the effects of workpiece surface flatness, finish, and texture on the normal and frictional workholding forces produced by a radial 4-pole electromagnetic chuck. Ring shaped case-hardened steel specimens were used in the experiments. The results show that the normal holding force decreases with increasing flatness deviation. The effect of surface roughness on the normal holding force was found to be small compared to the effect of flatness but significantly impacts the tangential holding force. The workpiece surface texture was also found to have an effect on the workholding forces.

Research on Surface Roughness Prediction Model for High-Speed Milling Inclined Plane of Hardened Steel

2010 ◽  
Vol 97-101 ◽  
pp. 2044-2048 ◽  
Author(s):  
Yuan Ling Chen ◽  
Bao Lei Zhang ◽  
Wei Ren Long ◽  
Hua Xu
Keyword(s):  
Surface Roughness ◽  
Prediction Model ◽  
High Speed ◽  
Hardened Steel ◽  
Prediction Errors ◽  
Inclined Plane ◽  
Workpiece Surface ◽  
Factors Influencing ◽  
Generalized Regression Neural Networks ◽  
Roughness Prediction

As the factors influencing the workpiece surface roughness is complexity and uncertainty, according to orthogonal experimental results, the paper established Empirical regression prediction model and generalized regression neural networks (GRNN) for prediction of surface roughness when machining inclined plane of hardened steel in high speed , moreover, compared their prediction errors. The results show that GRNN model has better prediction accuracy than empirical regression prediction model and can be better used to control the surface roughness dynamically.

Analysis of Surface Roughness and Wear Mechanism when Cutting Hardened Steel Rolls

2018 ◽  
Vol 777 ◽  
pp. 393-396
Author(s):  
Xin Yu Song ◽  
Guo Chen Du
Keyword(s):  
Surface Roughness ◽  
Steel Industry ◽  
Cutting Tools ◽  
Hardened Steel ◽  
Cutting Fluid ◽  
Workpiece Surface ◽  
Ceramic Tools ◽  
Low Efficiency ◽  
Almost All ◽  
Steel Rolls

In modern steel industry, hardened steel rolls are very important tools. The increase of the automobile and the mould keeps the amount of rolls increases fairly quickly. In cutting process, hardened rolls are very difficult to turn or mill, there for, almost all hardened rolls are cut only by grinding, which causes low efficiency, besides in grinding process and a lot of cutting fluid are used. In this paper, surface roughness of workpiece was analyzed of the ceramic tools in different cutting conditions. Wear machanism of crack and abrasive of cutting tools were also analyzed. The experimental and theoretical analysis confirmed that when the ceramic tools cutting cold rolls, the generation and expansion of the cracks the most important role that affect tool life and workpiece surface roughness.

Optimising the Process Conditions in Ultra-Precision Grinding to Achieve Surface Finish of Optical Quality

2006 ◽  
Vol 304-305 ◽  
pp. 8-13 ◽  
Author(s):  
T. Jin ◽  
D.J. Stephenson
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Material Removal ◽  
Removal Rate ◽  
Optical Quality ◽  
Process Conditions ◽  
Low Alloy Steel ◽  
Optical Surface ◽  
Precision Grinding ◽  
Ultra Precision

Optical surface finish below Ra 10nm can be achieved on a ‘Tetraform C’ grinder of ultra-high stiffness, when grinding a low alloy steel with or without the help of ELID (electrolytic in process dressing). Surface roughness generation modelling has been carried out to predict thepossible surface roughness values. Efforts have been made to transfer the process knowledge to different grinding mode using a rigid 5-axis Edgetek CNC grinder. The effects of material removal rate and grit size and also that of spark out passes on the surface roughness generated have been investigated.

Conditions for Scuffing Failure of Ground and Superfinished Steel Disks at High Sliding Speeds Using a Gas Turbine Engine Oil

1995 ◽  
Vol 117 (3) ◽  
pp. 482-489 ◽  
Author(s):  
M. J. Patching ◽  
C. C. Kweh ◽  
H. P. Evans ◽  
R. W. Snidle
Keyword(s):  
Experimental Investigation ◽  
Gas Turbine ◽  
Surface Finish ◽  
Axial Direction ◽  
Gas Turbine Engine ◽  
Hardened Steel ◽  
Engine Oil ◽  
Turbine Engine ◽  
Involute Gears ◽  
Scuffing Failure

This paper describes the results of an experimental investigation to compare the scuffing performance of conventionally ground and superfinished hardened steel disks operating at sliding speeds of up to 26 m/s and lubricated with a gas turbine engine oil at a temperature of 100° C. The ground disks were finished in the axial direction to simulate the orientation of surface finish found on involute gears. Superfinishing was found to give a significant increase in the load at which scuffing occurred. Frictional traction was also measured in the experiments and was found to be significantly lower for the superfinished disks in the loading stages preceding scuffing failure.

The Wear of Grinding Wheels: Part 1—Attritious Wear

1971 ◽  
Vol 93 (4) ◽  
pp. 1120-1128 ◽  
Author(s):  
S. Malkin ◽  
N. H. Cook
Keyword(s):  
Surface Finish ◽  
Grinding Force ◽  
Grinding Wheels ◽  
Precision Grinding ◽  
Grinding Forces ◽  
Workpiece Surface ◽  
Abrasive Grain ◽  
The Subject ◽  
Force Components ◽  
Sliding Force

An investigation of attritious and fracture wear of grinding wheels in precision grinding is described in a two paper sequence. Attritious wear, the subject of this first paper, refers to the dulling of the abrasive grain due to rubbing against the workpiece surface. The amount of dulling, measured by the area of the wear flats on the surface of the wheel, is found to be directly related to the grinding forces. In general, both the vertical and horizontal grinding force components increase linearly with the wear flat area. This is explained by considering the grinding force as the sum of a cutting force due to chip formation and a sliding force due to rubbing between the wear flats and workpiece. Related studies of wheel dressing, surface finish, and workpiece burn are also presented.

Experimental Investigation of Effect of Rotary Abrasive Jet Nozzle on Coating Removal Rate and Surface Finish

2014 ◽  
Vol 1043 ◽  
pp. 165-171 ◽  
Author(s):  
D.S. Robinson Smart ◽  
D.P. Rufus ◽  
Lijin George
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Mild Steel ◽  
Surface Finish ◽  
Removal Rate ◽  
Variable Angle ◽  
Coating Removal ◽  
Jet Nozzle ◽  
Rotary Speed

An abrasive jet machine can be used effectively for removing the existing coating on the surfaces .A rotating, variable angle abrasive jet nozzle has been designed to produce a swirling abrasive jet .The horizontal and the vertical striking angles of the abrasive jet nozzle has been adjusted as 50° ,40° respectively [1] . Investigations have been carried out to evaluate the effect of Garnet and SiO2 abrasives and the speed of the rotation of the nozzle on coating removal rate. Coated Mild steel, Galvanized Iron and Aluminium were used as specimens for investigations. The rotary abrasive jet nozzle provides the swirling abrasive jet and intensifying the shearing action as the speed increases gradually and reached up to 355 rpm. The surface roughness of the coating removed samples for various rotary speed of the abrasive jet nozzle were observed and measured. The surface roughness was found to be more closely associated with the speed of rotation of the abrasive jet nozzle.

Surface texture improvement of magnetic and non magnetic materials using magnetic abrasive finishing process

2020 ◽  
pp. 095440622097059
Author(s):  
Kamepalli Anjaneyulu ◽  
Gudipadu Venkatesh
Keyword(s):  
Surface Roughness ◽  
Surface Finish ◽  
Surface Texture ◽  
Magnetic Particles ◽  
Supply Voltage ◽  
Initial Surface ◽  
Magnetic Abrasive Finishing ◽  
Abrasive Finishing ◽  
Change In Mean ◽  
Al 2024

The present study focused on surface texture characteristics of magnetic material, Mild steel (MS) as well as nonmagnetic material, Aluminum 2024 (Al 2024) alloy with the application of a laboratory-developed magnetic abrasive finishing (MAF) process. MAF is one of the unconventional finishing processes to attain a satisfactory finishing level up to nanoscale. In MAF, the surface finish is controlled by a flexible magnetic abrasive brush (FMAB) which has a combination of abrasives (Al2O3, SiC, etc.) and magnetic particles (iron powder). The experiments were planned using (L27) full factorial design, different levels of weight percentage of abrasives (20–30%), speed of the electromagnet (180–2100rpm), and electromagnet supply voltage (30–50 V) were varied to enhance the surface responses. The responses considered were % improvements of change in the surface finish (%ΔRa), change in average peak to valley height (%ΔRz), change in total profile height (%ΔRt), and change in mean square root surface finish (%ΔRq). Analysis of variances (ANOVA) was evaluated and discussed. It is observed that the speed of the electromagnet and voltage are the most influencing variable parameters that most impacted on the responses. Surface roughness was measured before and after the MAF processing of MS and Al 2024 using a Suftronic S-100 surface roughness tester. The obtained surface morphology was examined by Scanning Electron Microscopy (SEM). It was observed that MS has %ΔRa = 83, %ΔRz = 65, %ΔRt = 65.5 and %ΔRq = 72.6 while Al 2024 has %ΔRa = 65, %ΔRz =50, %ΔRt = 51 and %ΔRq = 55 with noticeable surface texture improvement compared to the initial surface roughness obtained using surface grinding process.

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