Water Jet Machining

Abstract

Water jet drilling, in spite of its advantages of no tool wear and thermal damage, often creates delamination in composite laminate at bottom. An analytical approach to study the delamination during drilling by water jet piercing is presented. This model predicts an optimal water jet pressure for no delamination as a function of hole depth and material parameters.Moreover, the kerf formation of a ceramic plate cut by an abrasive waterjet is discussed. The mechanism and the effectiveness of material removal are studied. The kerf is slightly tapered with wider entry due to decreased cutting energy with kerf depth. A high-power input per unit length produces a small taper but a wide slot.Abrasive waterjet is adequate for machining of composite materials thanks to minimum thermal or mechanical stresses induced. The feasibility of milling of composite materials by abrasive waterjet is discussed. The basic mechanisms of chip formation, single-pass milling, double-pass milling followed by the repeatable surface generation by multiple-pass milling are studied. High volume removal rates as well as a neat surface are desired. Based on the results of single-pass milling tests, this chapter discusses the double-pass milling considering the effect of lateral feed increments. The study then extends to six-pass milling. The obtained surface roughness from the six-pass milling is expressed as a function of the width-to-depth ratio and the lateral increment. With the knowledge of the volume removal rate and the surface roughness as well as the effects of the major process parameters, one can proceed to design a milling operation by abrasive waterjet.

Research of Thermoplastics Turning after Workpiece Ultrasonic Treatment

“…The rational values of the cutting process main parameters, the tool material and the geometry of the tool cutting part were chosen on the basis of earlier studies [14,15,16,17]. The ultrasonic system generates ultrasonic oscillations with frequency 22 kHz, amplitude 10,0 μm, and intensity 1* 10-3 W / m2.…”

Abrasive Machining Techniques for Biomedical Device Applications

“…After this section, the high pressure water is transported to nozzle head with specially designed tubing system. The nozzles are in charge of controlling cutting conditions for soft or hard materials and how deep is the cut [1,22,23]. Mostly, the nozzle tips are made of synthetic diamond, cubic boron nitride (CBN) and tungsten carbide (WC) as these materials offer high wear resistance [24,25].…”

“…With a deeper investigation of these processes reveals that abrasive machining processes offer the lowest adverse effects on workpiece materials. Different types of abrasive machining Juniper Online Journal Material Science are introduced that water jet machining (WJM), abrasive jet machining (AJM) and abrasive water jet machining (AWJM) are the most common ones [9][10][11]. These techniques utilize the abrasion power of the cutting media (i.e.…”

Computer Vision Algorithm for Characterization of a Turbulent Gas–Liquid Jet

“…Intense fluid jetting is a key technical element in a number of industrial devices, e.g., grinding [1][2][3], cutting [4,5], etc. The detailed characterization of multiphase gas-liquid flows is critical in metallurgical processes, the design of efficient air and ground devices, combustion devices in aircraft and aerospace systems, and engines in transportation and marine engines, as well as when developing new technologies leading to technological advances [6][7][8][9].…”