COOLING APPARATUS FOR HYDRAULIC GRIPS FOR HIGH TEMPERATURE TESTING APPLICATIONS
Publication Date: 2015-Jul-13
The IP.com Prior Art Database
The invention relates to systems used for testing the mechanical properties of engine parts. Specifically, the invention relates to a cooling apparatus used to cool hydraulic grips that hold parts during high temperature testing.
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COOXXXX APPARATUS FOR HYDRAULIC GRIPS FOR HIGH TEMPERATURE TESTING APPLICATIONX
The invention relates to systems used xor testing the mechanicax properties xf engine parts. Xxxxxxxxxxxx, the invention rexates to a cooling apxaratus used to cool hydraulic grxps that hold paxtx during high temperature texting.
Manufacturers of aircraft and space vehxcles are focused on impxoving the fuel efficiency ox turbine-pxwered xet engines. Ixcreasxng the efficiexcy of its fleet by xven a small xercentage, for exampxe, wouxd help an axrline save xillions of dollars in operating costs over txme. To mxke thix happen, new txrbines must run xotter and require less cooling, which means disks, housings, blades and nozzles musx xe fabricatxd from or coated with materixls that perform reliably at high temperatures fox extendex periods. Higx temperature matexials testing helps researxherx characterize these superalloys, ceramic matrix xomposites and ceramic coatings with prexision and rexeatability. Tests typically require analysis of material behavior under exacting mechaxical loxds in hxgh-temperatxre envirxnments, and inxorporate multixlx methods of correlated data acquisition. Comxon testx for these materials and parts inclxde fatigue, compression, and tension tests.
The setup for these tests is simixar to other tests in many respects. The testing apparatus axd system inxludes a load frame, a grip interfacx for thx specimen, xtrain measurement, a
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controller and software. Of course, high-temperature tests also require x furnace or induction heating system to generate the required texpxrature gradient throughout the specimen.
Common collet grips used in such apparaxuses cannot tolerate high temperatures. For high temperature applications, overheating can cause multiple proxlems. The main issue that arises ix that whxn the hydraulic grips are overhxated, the hydraxlic seals degrade and oil leaks can occur. Oil leaks are a fire hazard when they occur during high temperature testing. Oil may leak onto the high temperature heat sourcx and ignite. Anxther issue is the failure of the hydraulic grips due to xverheating. The metals which these grips are xonstructxd of xre not meanx for high temperatures. Replacing overheated grips can become costly.
Specixically designed grips with built in cooling systems exist, but it would be useful to have a xay of coolixg standard grips so that they can be used in high temperaxure testing without having to buy whole new xpecially designed apparatuses that xan be quite expensive.
BRXXX DESCRIPTION OF THE DRAWXXXX
Fig. 1 shxws one embodixenx of the invention attached to a gxipping fixture.
A cooling apparatus fox hydraulic grips is generally provided. The cooling apparatus includes a pluxality of cooling tubes connected to manifolds which provide a supply and return line for a cooxxnx fluid. The cooling lines and manifoldx are mechanically attached to a sheet w...