scholarly journals Flow Field Characteristics and Experimental Research on Inner-Jet Electrochemical Face Grinding of SUS420J2 Stainless Steel

2021 ◽  
Author(s):  
Feng Wang ◽  
Yafeng He ◽  
Xiaokai Wu ◽  
Min Kang
Keyword(s):  
Stainless Steel ◽  
Flow Field ◽  
High Speed ◽  
High Hardness ◽  
Good Prospect ◽  
Matching Effect ◽  
Object A ◽  
Flow Field Characteristics ◽  
High Speed Rotation ◽  
Through Hole

Abstract Electrochemical grinding (ECG) is processed by the combination of dissolution and grinding. It is very suitable for the processing of difficult-to-cut stainless steel, but its processing performance is restricted by the matching effect of dissolution and grinding. In this work, the processing of the torus surfaces of the stainless steel shaver cap was taken as the research object. A flow field model including the through-hole structure and the rotation of the grinding head was proposed to optimize the flow field distribution and promote the uniform dissolution of materials. The flow field simulation results showed that the rotational flow formed by the high-speed rotation prolonged the electrolyte flow path and was not conducive to the discharge of electrolytic products, and the reasonable selection of the diameter and distribution of the through-hole could reduce the velocity difference. The effects of rotational speed, feed rate, and inlet pressure on the flatness and surface roughness of the torus surfaces were experimentally investigated, and a better matching effect of dissolution and grinding was obtained. Moreover, the experimental results showed that the inner-jet ECG had a good prospect in the batch processing of high-hardness stainless steel parts.

Flow Field and Static Pressure Analysis of Adsorption Principle of Wall-Climbing Robot

2013 ◽  
Vol 427-429 ◽  
pp. 65-68
Author(s):  
Yi Tong Ma ◽  
Fang Xing Li ◽  
Xue Shan Gao ◽  
Wei Jie Bo
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Static Pressure ◽  
Fluid Dynamic ◽  
Surface Flow ◽  
Air Inlet ◽  
High Speed Rotation ◽  
Basic Parameters ◽  
Speed Rotation ◽  
Pressure Analysis

The impeller is key element that brings about negative pressure adsorption. The efficiency of the impeller will determine the adsorption capacity of robot. In this paper, physical model is built based on the theory of fluid dynamics by taking a common high speed rotation of impeller as a research object. The basic parameters and boundary conditions are set and a 3D fluid dynamic simulation is done based on FloEFD. The factors such as blade curve, rotational speed and air inlet velocity which have effect on surface flow field impeller are investigated. Then the results are shown by figures and the study analysis is carried on.

scholarly journals Flow Characteristics of a Highly Rotating Turbine Cavity System With Discharge Hole

1999 ◽  
Author(s):  
D. J. Maeng ◽  
J. S. Lee ◽  
R. Jakoby ◽  
S. Kim ◽  
S. Wittig
Keyword(s):  
Flow Field ◽  
High Speed ◽  
Rotational Velocity ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Rotating Disk ◽  
Disk System ◽  
High Speed Rotation ◽  
Measured Flow ◽  
Cavity System

An experimental investigation is performed to analyze the flow characteristics of a turbine cavity system containing discharge holes installed in a rotating disk. The turbine cavity system is composed of a rotating disk and two stationary disks on both sides of the rotating disk. The air flow is induced into the upstream cavity, and then discharged into the downstream cavity through 8 discharge holes in the rotating disk. The flow field in each cavity at high-speed rotation of the rotor was measured by a three-dimensional LDV system. The measured flow field is analyzed to understand the flow structures, and further provide information for studying the heat transfer behaviors of the turbine disk system. The overall flow field in the upstream cavity shows a negligible axial velocity with a relatively small rotational velocity, less than 10% of the rotor speed. The downstream cavity flow has a high rotational velocity close to the rotational speed of the discharged jets, due to the direct circumferential momentum transfer from the discharged jets. The interaction between the discharged jet and the downstream stator disk induces an asymmetric development of the spreading wall jet, which results in a relative circumferential motion to the revolving discharged jet. The whole flow field in the downstream cavity is divided into several flow regions according to their features.

Numerical Simulation of Liquid-Solid Two-Phase Flow Field in Discharge Gap of High-Speed Small Hole EDM Drilling

2008 ◽  
Vol 53-54 ◽  
pp. 409-414 ◽  
Author(s):  
Y.Q. Wang ◽  
Ming Rang Cao ◽  
Sheng Qiang Yang ◽  
Wen Hui Li
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
High Speed ◽  
Two Phase Flow ◽  
Removal Rate ◽  
Small Hole ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Field Characteristics ◽  
Edm Drilling

The flow field characteristics have a significant effect on the machining stability in high-speed small hole EDM drilling. Thus, Lagrangian discrete phase model (DPM) has been developed to simulate the gap liquid-solid two-phase flow field. The numerical calculation is based on the standard k-ε turbulent model, and the SIMPLEC algorithm is used in the simulation. All the governing equations are solved by software Fluent 6.2. Through numerical simulation, the pressure distribution, the velocity distribution of the dielectric liquid, traces of debris particles, and the debris particle concentration were obtained. The flow field characteristics under different pressures and drilling depths were obtained through simulations. Finally, experiments were carried out to investigate the effects of the flush velocity at exit obtained through simulation on material removal rate (MRR).

scholarly journals Investigation on the Electrochemical Micromachining of Micro Through-Hole by Using Micro Helical Electrode

Micromachines ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 118 ◽  
Author(s):  
Baohui Liu ◽  
Hang Zou ◽  
Haixuan Luo ◽  
Xiaoming Yue
Keyword(s):  
Process Parameters ◽  
High Speed ◽  
Pulse Frequency ◽  
Machining Process ◽  
Electrochemical Micromachining ◽  
Good Effect ◽  
Machining Accuracy ◽  
High Speed Rotation ◽  
Helical Electrode ◽  
Through Hole

The instability of machining process caused by the difficulty of the electrolyte refresh in electrochemical micromachining (EMM) of micro through-hole has been an unsolved problem. Thus, this paper investigates the electrochemical micromachining of micro through-hole by using a micro helical electrode combining with the jetting electrolyte. With the help of high-speed rotation of micro helical electrode and its spiral shape, the internal electrolyte can be stirred while the external jetting electrolyte can flow into the hole along the spiral groove to refresh the electrolyte effectively, thereby, improving the machining stability of EMM. Firstly, the influence of the process parameters on the fabrication of micro through-hole in the EMM by using micro helical electrode without non-conductive mask is investigated. Based on the optimization of the process parameters, a micro through-hole with an inlet dimension of 121.6 μm and an outlet dimension of 114.9 μm is obtained successfully. Furthermore, this paper also tries to use the micro helical electrode coated with the non-conductive mask to decrease the bad influence of the stray corrosion attack. It is found that the non-conductive mask coated on the surface of micro helical electrode can improve the machining accuracy significantly under the condition of low pulse frequency (≤1 KHz). However, its good effect on preventing the stray corrosion decreases along with the increase of the pulse frequency.

Numerical Simulation and Analysis for the Flow Field of the Main Nozzle in an Air-Jet Loom Based on FLUENT

2011 ◽  
Vol 105-107 ◽  
pp. 172-175 ◽  
Author(s):  
Ding Ding Liu ◽  
Zhi Hua Feng ◽  
Bao Hui Tan ◽  
Yin Ping Tang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
High Speed ◽  
Static Pressure ◽  
Structural Parameters ◽  
Parameters Optimization ◽  
Airflow Velocity ◽  
Air Jet ◽  
Flow Field Characteristics ◽  
Air Jet Loom

Due to the complicated structure and the high speed turbulence, it is difficult to measure and analyze the flow field characteristics of the main nozzle by experimental methods, naturally, some software such as FLUENT become a powerful tool to perform the numerical simulation for flow field of the main nozzle of an air-jet loom. The distribution of the airflow velocity and static pressure along axial and radial direction in main nozzle were investigated. The results indicated that the airflow in the main nozzle was extremely complex, its velocity in throat could be sonic and a certain backflow was produced. The research results will play an important role on the structural parameters optimization and energy conservation.

Sign in / Sign up

Export Citation Format

Share Document