Thermal deburring (also known as explosive deburring or the Thermal Energy Method - TEM) is an extremely quick and effective method of non selective deburring, for both internal and external burrs or flash. Components are enclosed in a cylindrical chamber which is then sealed, measured amounts of fuel gas and oxygen are introduced into the chamber and ignited.
In order to take account of variations in component type and material, the fuel gas to oxygen ratio is changed by means of pressure regulators in the supply lines which control the individual cylinders.
The use of metering cylinders enables consistent and repeatable deburring results cycle after cycle. By recording the machine parameters in relation to a particular component, consistent results can be maintained from batch to batch, no matter how long the time interval may be.
The fuel is transferred to the deburring chamber by directly coupled hydraulic cylinders. When the chamber is fully charged, the gas and oxygen supply is isolated and the gas mixture ignited. The resulting 'blast' will cause the burrs or flash to be heated beyond their ignition temperature until they amalgamate with surplus oxygen to form oxide of the component material. This will happen for the following reasons:
The 'blast' termperature is between 2500 and 3500 degrees celsius
Burrs or flash have a large surface area in relation to their volume and can't dissipate the heat.
On completion of the burn the chamber is opened, components replaced, and a new cycle initiated. Each new type of workpiece being carefully assessed to achieve the best quality results.