SHUR-LOK™

Coupling for Aluminum Degassing Shafts

Shur-lok^TM coupling and shaft

Rotor degassing is the technology process of choice in aluminum sand and permanent mold foundries, diecasters and casthouses to remove hydrogen and other impurities from molten aluminum. Graphite shafts and rotors of various designs are used with different mechanical drive systems to mix process gas with the metal. The connection between shaft and drive system, and the stresses and environment which the shaft is

subjected to, often lead to mis-aligned installation, broken threads, poor gas sealing capability, premature shaft failure, loss of productivity, and excessive down-time for shaft changeout.

The new Shur-Lok^{TM^*} coupling created by Metaullics addresses these problems, and offers several advantages:

The Shur-Lok provides:

Threadless design eliminates stress points created by graphite threads
High strength-better cantilever loading capacity
Better gas sealing-less leakage and safer if chorine is used
Improved alignment, less shaft run-out
Easy and fast shaft change-out
Extended shaft life

Specific Shur-Lok^TM retro-fit kits for many commercial degassing systems are available. See below for comparison tests and technical data.

Shur-Lok Test Performance

The following charts show how the Shur-Lok performs in comparison with other coupling types. At all torque levels, there is less gas leakage and less removal torque necessary to change out the shaft. Run-out for a coupling/shaft assembly is as little as 0.030” total TIR up to 600 rpm.

The Shur-Lok Coupling Adds to Shaft Life with Metaullics Oxidation and Wear Protection Technologies

The two principal failure modes of degassing shafts are oxidation and wear (other than accidental mechanical damage). Oxidation resistance is increased with Metaullics’ proprietary chemical impregnation process. The chart to the left depicts results of an accelerated laboratory oxidation weight loss test performed on production lots of graphite. This test is conducted on samples from every production run of Metaullics graphite degassing parts. Metaullics oxidation resistance treatment complements the Shur-Lok coupling technology to provide optimum life.
MAC Ceramic Sleeves - The answer to Metal Line Wear
Metaullics manufactures a thin-walled, non-wetted, fine-grained high performance ceramic sleeve to extend graphite shaft life, especially in continuous aluminum degassing applications. Metal line wear and erosion are significantly reduced or eliminated.

Rotor Efficiency

Metaullics' own proprietary rotor, the STAR, provides excellent degassing capability in foundry applications using nitrogen alone. The charts below describe the performance in laboratory oxygen desorption tests, and in an actual foundry application comparing various other commercial rotor designs.

^*Patent Pending

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The information, recommendations and opinions set forth herein are offered solely for your consideration, inquiry and verification and are not, in part or in total, to be construed as constituting a warranty or representation for which we assume legal responsibility. Nothing contained herein is to be interpreted as authorization to practice a patented invention without a license.

The following charts show how the Shur-Lok performs in comparison with other coupling types. At all torque levels, there is less gas leakage and less	removal torque necessary to change out the shaft. Run-out for a coupling/shaft assembly is as little as 0.030” total TIR up to 600 rpm.