2 edition of mechanisms of material removal during erosive cutting of ductile materials. found in the catalog.
mechanisms of material removal during erosive cutting of ductile materials.
Suresh Hiralal Vora
Written in English
|The Physical Object|
|Pagination||ix, 47 l.|
|Number of Pages||47|
The present investigation is concerned with the erosive cutting of nominally brittle materials by the impact of a stream of solid particles and it is shown that ductile behavior should be observed when the particle size and velocity are within certain limits. Rotary ultrasonic machining (RUM) is considered to be a very effective and relatively accurate way to drill deep holes in brittle materials. Although brittle fracture (micro chipping) is the dominant material removal mechanism utilized by the RUM process, poor surface roughness and deep penetrated cracks are the consequence if the machining parameters are not properly controlled.
Machining • Machining: Material removal processes • Categories of machining • Cutting – involve single or multipoint cutting tools and processes Turning, boring, drilling, tapping, milling, sawing, and broaching • Abrasive processes Grinding, honing, lapping, ultrasonic machining • Advanced machining (Non- traditional machining processs). A combined experimental and modeling approach has been devised to understand the material removal mechanism during abrasion of ductile copper discs. First, single grit scratch intersection experiments are conducted at the micro-scale (with mm depth of cut). This is followed by FEM analysis. Then a simple analytical model is developed, and the model prediction is verified against.
Improper selection of the materials Selection of a material for developing the design of a mechanical component during service in light of operating conditions should be based on expected failure mechanisms such as ductile or brittle fracture, creep, fatigue, wear etc. In case of ductile materials, maximum wear takes place at small angles (around 20°). Brittle materials, on the other hand, react differently – the maximum wear is at large angles (around 90°). If abrasive particles are in fluids, the mechanism is called hydro-abrasive erosion.
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In this expression, k is a quantity involving material constants, r is the average radius, and U the velocity of the impacting particles. The exponents f 1 (m) and f 2 (m) are prescribed functions of m, the flaw parameter of the Weibull fracture strength distribution.
Tests on a variety of brittle materials, using both angular silicon carbide particles and spherical steel shot, show the Cited by: Ductile mode wear In the erosion ductile mode, the material underneath the particle exhibits high deformation.
It is worldwide accepted that ductile erosion is essentially due to a cutting process. Figure 2: Mesh for ductile erosion mode. The impact between a round particle and the surface target has been analysed with an Eulerian solver.
Material Removal Material removal is performed by the abrasive action of a grit-loaded slurry (boron carbide, aluminium oxide and silicon carbide particles transported by water) circulating in a gap of 25–µm between the workpiece and the vibrating tool.
From: Advanced Machining Processes of Metallic Materials (Second Edition), The fundamental mechanisms of erosion by solid particle impact were investigated in both brittle and ductile materials.
A review of the literature of erosion theoretical models indicated various different models. The most important ones were used to reproduce experimental tests concerning the erosion by solid particle impingement using gas jets. If supported by an appropriate tuning of Cited by: A new impact erosion mechanism for ductile materials has been developed to fundamentally explain the material removal process, that is through material failures induced by inertia, elongation and adiabatic shear banding.
For consistency, the term cutting wear is Cited by: 6. There are 4 different mechanisms of material removal in metal cutting depending on the layer of materials being cut (from macro to micro to ultra-precision level)- Shearing, Extrusion, Ploughing &.
` 1 Examination of the material removal mechanisms during the lapping process of advanced ceramic rolling elements J. Kang a, M.
Hadfield b* aDepartment of Design and Systems Engineering, Brunel University, Runnymede Campus, Egham, Surrey TW20 0JZ, UK. Material Removal Mechanisms The material removal mechanisms of AWJM need to be distinguished by the erosion mode of single abrasive grits predominantly accountable for material removal process.
The occurrence and extent of each mechanism depend on the one hand on whether the ta rget material is brittle or ductile.
cavitation erosion of ductile materials is proposed. Key-Words: erosion, cavitation, volume loss curve, Bessel function, ductile material 1 Introduction The cavitation erosion in hydraulic systems is an old problem, but the damage mechanism that culminates in material loss was not known with certainty until recently.
If the material of the workpiece is ductile, the material flows plastically along the shear plane, forming chip, which flows upwards along the face of the tool.
A review on the erosion mechanisms in abrasive waterjet the material and its sharpness can be retained long during the process. In current machining practice, cutting tools with the ductile-mode-like material removal has become attractive for industry.
Mechanism of material removal in abrasive jet machining (AJM) is impact erosion. Mechanical erosion is basically a combination of cutting wear and deformation wear. When high-velocity abrasive jet is made to impinge the work surface in a particular direction from a suitable stand-off distance (SOD), it erodes material primarily by micro-cutting.
In normal impact erosion of ductile materials, plastic deformation is observed to be the mechanism of material removal. Bitter [8,9] proposed that repeated impacts of erodent particles at normal incidence can loosen a piece of material from the impact site.
ductile and brittle material, various other mechanisms of material removal have been found to be responsible for material removal when different types of materials are cut with abrasive water jet.
Further the mechanism of material removal can be identified in two different ways such as microscopic and macroscopic level. Macro-Mechanism. A new impact erosion mechanism for ductile materials has been developed to fundamentally explain the material removal proce ss, that is through material.
Abstract. The erosion mechanisms in an abrasive waterjet(AWJ) kerf cutting process are studied using scanning electron microscopy. It is concluded that the cutting process is associated with abrasive particle impacts at low incidence angles and that material removal of ceramic target materials is caused by intergranular cracking and plastic flow.
Fig. 2: Cutting mechanisms during oblique impact erosion, impact direction was from left to right  In normal impact erosion of ductile materials, plastic deformation is observed to be the mechanism of material removal. Bitter  proposed that repeated impacts of erodent particles at normal incidence can cause loosening a piece of.
of brittle materials which produce a mirror surface ﬁnish (nanometre order surface roughness) and which do not require further ﬁnishing operations such as polishing [26, 27].
In our laboratory studies, mirrors and lenses have been manufactured only with a grinding process, using the % ductile mode material removal process in grinding. MECHANISMS OF MATERIAL REMOVAL IN THE SOLID PARTICLE EROSION OF DUCTILE MATERIALS Author(s): Mayville, Ronald A.
of an increasing material removal rate (cutting speed, feed and depth of cut). The increased removal rate result in increased thermo-mechanical loads, due to severe material deformation, on the cutting tool which lead to an increased wear of the tool and hence poor machining conditions.
These conditions will signi cantly a ect the product quality. The cutting mechanism cannot be the predominant factor for material loss in the present normal-incidence impacts, and there is no succeeding particle to remove platelets formed by previous impacts.
Abrasive wear of ductile substrates: (a) cutting mechanism and (b) plastic deformation together with fatigue mechanism. The mechanism of material removal in erosive wear is not only a function of the properties of the target surface but also a function of the testing condition such as velocity and impact angle of the erodant particles.
In. Once a process involves a cut or removal of materials, deformation mechanisms of the material are raised and commonly they include ductile and brittle deformation modes.