Pneumatics & Hydraulics


Cooler castings, tighter tolerances

November 2007 Pneumatics & Hydraulics

Application

A steel casting company is using an Exair Model 5215 Cold Gun to remove heat from steel alloy casting gates on a grinding application. The more heat they can keep from the grinding wheel and from the casting gate, the closer they are to tolerance on the secondary polishing and blending application.

An Exair Cold Gun in operation
An Exair Cold Gun in operation

This is an alternative to expensive mist systems. It eliminates the costs associated with the purchase and disposal of cutting fluids and coolants and the worker related health problems from breathing airborne coolant or slipping on wet floors.

The Model 5215 system includes Cold Gun, single point hose kit, 10 mm cone nozzle, 32 mm fan nozzle and filter separator.

Principle of operation

The Cold Gun incorporates a vortex tube to convert an ordinary supply of compressed air into two low pressure streams, one hot and one cold. The hot airstream is muffled and discharged through the hot air exhaust. The cold air is muffled and discharged through the flexible hose, which directs it to the point of use. The magnetic base provides easy mounting and portability.

Compressed air supply

The gun is designed to use full line pressure of 5,5-6,9 bar. Temperature drop and flow are reduced when lower input pressures are applied. The use of clean, filtered air is essential to correct operation. A manual drain filter that removes moisture, dirt and other particulates from the compressed air is included with each system.

Control options

The Exair Cold Gun gives instant cold air when filtered compressed air is supplied to it. The gun is non-adjustable to prevent freeze-up during use. Cold air flow and temperature drop are factory set to optimise the gun's cooling capacity. Cycling on and off is a good way to save air. The Model 9012 manual shutoff valve can be used for on and off control. To automate turning the gun on and off with the associated grinding machine, the Model 9020 solenoid valve may be used.

For more information contact Rodney Bradley, ETEST, +27 (0)31 702 8302, etest@mweb.co.za, www.etest.co.za



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