Electro Hydraulic Forming Process

 

 

 

Process principle

During electrohydraulic forming stored electric energy is suddenly discharged through a spark gap so that the surrounding working medium (e.g. water) is ionized and vaporizes, initiating a shockwave.

Process variants

According to the type of spark gap

• electrohydraulic forming with discharge through a wire (i.e. the electrodes are connected to each other by a wire bridge) and
• electrohydraulic forming with discharge through a gap (i.e. there is no connection between the electrodes) can be differentiated.

According to [Wil64], the setup with a wire bridge is more efficient and can be operated at lower voltages and longer distances between the electrodes, while in case of the setup with discharge through a gap, the process preparation is easier and faster.
The efficiency of an electrohydraulic process can be increased by using a suitable reflector. The reflector design needs to be done taking into account the specific forming task and considering that every redirection of the pressure war is related to energy losses. As shown in [Kle01], the shockwave can be focused by using an elliptic reflector geometry. Spherically spreading from the spark gap, which is positioned in the first focal point of the ellipse, the shockwave is reflected and converges in the second focal point. Other reflector geometries can be used for bulging tubes of different dimensions.

Difference Between jig and fixture

 INTRODUCTION
The jigs and fixtures are the economical ways to produce a component in mass. So jigs
and fixtures are used and serve as one of the most important facility of mass production
system. These are special work holding and tool guiding device. Quality of the
performance of a process largely influenced by the quality of jigs and fixtures used for
this purpose. What makes a fixture unique is that each one is built to fit a particular part
or shape. The main purpose of a fixture is to locate and in the cases hold a workpiece
during an operation. A jig differs from a fixture in the sense that it guides the tool to its
correct position or towards its correct movement during an operation in addition to
locating and supporting the workpiece.
An example of jig is when a key is duplicated, the original key is used as base for the
path reader which guides the movement of tool to make its duplicate key. The path
reader of a CWC machine here works as a jig and the original is called template.
Sometimes the template and jig both are the name of same part of a manufacturing
system.





Structure
1 Introduction
Objectives
2 Purpose and Advantages of Jigs and Fixtures
3 Important Considerations while Designing Jigs and Fixtures
4 Meaning of Location
5 Principles of Locations
6 Different Methods Used for Locations
7 Clamping
8 Different Types of Clamps
9 Jigs
10 Different Types of Jigs
11 Fixtures
12 Summary
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