Electrochemical, textural and microstructural effects of ...

The mechanical grinding process provokes a decrease of L m, this effect being more rapid in the first 5 h (258 Å). On further grinding, L m decreases less abruptly (167 Å at 100 h). For the non-ground graphitized coke sample the presence of microstrains is negligible, as found for well-crystallized graphite [6] .

(PDF) Ultra-precision grinding of a hydrostatic mechanical ...

Ultra-precision grinding of a hydrostatic mechanical sealing ring face with extremely shallow taper angle April 2011 Proceedings of the Institution of Mechanical Engineers Part B …

Effects of pressure angle and tip relief on the life of ...

This paper examines failure of helical gear in speed increasing gearbox used in the wind turbine generator (WTG). In addition, an attempt has been made to get suitable gear micro-geometry such as pressure angle and tip relief to minimize the gear failure in the wind turbines. As the gear trains in the wind turbine gearbox is prearranged with higher speed ratio and the …

Advances and Processes in ... - University of Florida

Then there is mechanical tearing of those bonds leading to SiO 2 removal instead of removal of lumps of Silicon Hydroxide (Si(OH) 4). [2] 3.1.1 Pitch Polishing: It is one of the most historic processes and has been used since ages. Pitch is a very complex material. There is

Effect of mechanical grinding of pitch-based carbon fibers ...

The effect of mechanical grinding on the electrochemical properties of P100 and P75 fibers and natural graphite UF4 was studied. The electrochemical experiments were conducted in the NaClO 4 –ethylene carbonate (EC) electrolyte. Graphite did not allow significant sodium intercalation intrinsically but P100 and P75 fibers, which display lower graphitization …

ME 563 MECHANICAL VIBRATIONS - Purdue University

ME 563 Mechanical Vibrations Fall 2010 1-2 1 Introduction to Mechanical Vibrations 1.1 Bad vibrations, good vibrations, and the role of analysis Vibrations are oscillations in mechanical dynamic systems. Although any system can oscillate when it is forced to do so externally, the term "vibration" in mechanical engineering is often

MIXER MECHANICAL DESIGN—FLUID FORCES

the mechanical design requirements must be understood. The second step in the design sequence is the mechanical design of the mixer components. The fundamental approach is straight-forward, design for power (torque and speed), then shaft loads, and finally mixer dynamics. For larger systems above 100 hp it may be

(PDF) Effect of wafer back grinding on the mechanical ...

To study the effect of back grinding on the mechanical properties of the active side of the die, low-k stacked wafers were grinded to four different thicknesses of 500 mum, 300 mum, 150 mum, and ...

CHAPTER 21 Mechanical Design of Mixing Equipment - …

Mechanical Design of Mixing Equipment D. S. DICKEY MixTech, Inc. J. B. FASANO Chemineer, Inc. 21-1 INTRODUCTION Mixing equipment must be designed for mechanical and process operation. Al-though mixer design begins with a focus on process requirements, the mechanical design is essential for successful operation. Usually, a competent manufacturer of

Investigating the effects of contact pressure on rail ...

This paper presents an experimental investigation into the effects of various contact pressures on the abrasive belt grinding performance of rail material. The contact relations between the contact wheel covered with elastic rubber and the head surface of the rail are first analytically discussed as they relate to the pressure distribution. The contact pressure, which …

Effect of mechanical grinding of pitch-based carbon fibers ...

The effect of mechanical grinding on the electrochemical properties of P100 and P75 fibers and natural graphite UF4 was studied. The electrochemical experiments …

Theoretical Simulation and Experimental Investigation of a ...

The Cologne-egg fastening systems applied in metro lines, which can be subjected to rail corrugation, are considered in this paper. To understand the mechanism of the formation and development of rail corrugation, dynamic models of the wheel and the track with Cologne-egg fastening system in the frequency domain are developed to analyse the wheel and track …

abrasive machining processes - IIT Kanpur

Grinding is a combination of rubbing, ploughing and cutting (actual chip formation) . A certain level of grit penetration into workpiece is required before chip formation can start. Magnitude of critical grit depth of cut required to initiate cutting becomes less with the increase of grinding velocity.

Jet Mill Grinder of Pitch Coke-ALPA POWDER

The grinding process is mainly dependent on the collision of the material itself, and is different from the impact of the mechanical crushing blade or the hammer on the ground on the ground, so the equipment is high, and the product is purity. Jet Mill Grinder of Pitch Coke is widely used, do you know how to use it correctly? The following ...

CHAPTER 3 MECHANISMS OF MATERIAL REMOVAL IN …

The Chemical Mechanical Polishing (CMP) process is now widely employed in the manufacture of Ultra-Large-Scale Integrated (ULSI) circuits. Yet, the effects of various process parameters on the material removal rate (MRR) and the resulting surface topography are not well understood. In this chapter, accordingly, several polishing models are reviewed

Sub-surface mechanical damage distributions during ...

@article{osti_898584, title = {Sub-surface mechanical damage distributions during grinding of fused silica}, author = {Suratwala, T I and Wong, L L and Miller, P E and Feit, M D and Menapace, J A and Steele, R A and Davis, P A and Walmer, D}, abstractNote = {The distribution and characteristics of surface cracking (i.e. sub-surface damage or SSD) formed during …

Effect of the average grain size of green pitch coke on ...

Three self-sintered graphite blocks (SGs) were prepared from green pitch cokes with different average grain sizes (5.1, 3.1 and 1.9 μm) using cold isostatic compaction. The microstructures and properties of the SGs were characterized by XRD, SEM, mercury porosimetry, mechanical and thermal tests.

EXPERIMENT: 1 MEASUREMENT OF LENGTH, AND …

equal to (pitch/n).A linear scale with graduations in mm and 0.5mm is engraved on the barrel. This is the Main scale a circular scale with 50 divisions is engraved on the beveled surface of the thimble, this is vernier scale. If the micrometer screw has a …

Multilayer Fabrication of Micromolding and Electroforming ...

Traditional mechanical grinding utilizes the cutting edges of abrasive grains on the grinding wheel to produce the fine surface finishes. However, the sharpness of grinding wheels becomes dull with the processing time, so that the truing and dressing of the wheels are required to achieve the ultraprecision surface finish.

Effect of grinding forces on the vibration of grinding ...

Harmful vibrations during mechanical processing (such as grinding or milling) have to be avoided since they deteriorate the quality of the product as well as have a negative effect on the human ...

Two gear-grinding techniques to improve pitch deviations ...

In order to reduce the effects of the gear profile deviations on the gear pitch deviations, the optimal forming principle of ultra-precision involute profile is adopted during the gear-grinding experiment. 9 The master gear with module m = 3 mm, the number of teeth z = 40, tooth width b = 25 mm, press angle α = 20° and helix angle β = 0° is ...

Design and Selection of Hobs

Normal Diametral Pitch - 11' [3.1416) divided by the Nor-mal Circular Pitch, pitch circle - A transverse section of the hob pitch cyUnder. pitch cylinder-A reference cylinder in a hob from which design elements, such as lead, lead angIe, profile,and tooth thickness are derived. pitch diameter - The diameter of the pitch cylinder.

Calculation of V-Belt Tensions And Shaft Loads - MPTA

Mechanical Power Transmission Association 5672 Strand Court, Suite 2, Naples, FL 34110 MPTA-B7i-2007R 2013 Calculation of V-Belt Tensions

Effect of Mechanical Grinding on the Lithium Intercalation ...

The effects of mechanical grinding on morphology and electrochemical performance of graphite and soft carbon powders with respect to lithium insertion were studied. The morphology of the milled graphitic powders was found to depend strongly upon the nature of the interactions (e.g., impact or shear) generated by the two kinds of mixer mills used.

Effect of rogue particles on the sub-surface damage of ...

The pitch lap was prepared by heating 500 gm of Gugolz 73 ground in ~mm sized pieces in an aluminum foil covered stainless steel container (12 cm diam x 16 cm) in a convection oven at 76.7 oC for 60 minutes. The pitch was stirred afte r …

ENGINEERING METHODS OF TECHNOLOGICAL …

grinding process includes determination of the coefficient of use of th e area of plates, cutting capacity and required power of the equipment. The operator scheme of mechanical processing of mea t consists of the subsystem of preliminary grinding of meat and subsystem of mechanical processing of minced meat.