WEAR LIFE TESTING |
Journal Bearing Test | Timken Ring Block Test | Rider and Plate Test | Quality Control Testing
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The best wear life tests are conducted with the actual assembled hardware, using techniques and procedures that are the same as those used in production, and tested in the same environment in which it is intended for use. Temperature and contamination environment and the same start-stop intervals and the same lull periods should be duplicated as closely as possible. However, time required to duplicate actual operating conditions may not be available, so the next best thing is the accelerated bench test. This type of test serves best as a screening tool. In the following pages we will describe several different types of bench tests. Possibly there is one that is similar in geometry and mechanics to an application you have in mind. If so, you may be able to get some indication of whether or not Vitro-Lube will meet your needs. If your extrapolation shows promise, then this should be regarded as justification for an actual test of production components. The following test data were generated outside of our facilities.
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These tests were conducted using a timken
ring and conforming block test machine (see figure 3) which subjects the
coating to a unit pressure of 1900 psi, a speed of 50 cycles per minute
(oscillating), an amplitude of oscillation of 60 degrees, and at room
temperature. Test materials were 17-4 PH corrosion resistant steel. The following
is a comparison between Vitro-Lube NPI-1220 and NPI-1220C.
Based on these results, the 1220C coating
has been added to an existing user specification for use on newer design
applications. |
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These tests were conducted using circular riders made of 440C stainless steel and flat rectangular plates made of 17-4PH stainless steel. Both the rider and the specimens was accomplished through an air cylinder and lever system. The flat plate was attached to a table and reciprocated under the rider by a mechanical drive system. The stress level at the contact area between the rider and the plate was 10,000 psi; the stroke length was one inch (two inches per cycle); the speed of reciprocation was 33 cycles per minute; and the test temperature was 450°F. Failure occurred when the friction coefficient reached 0.45. |
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This test program evaluated
twenty-two commercial dry film lubricant products, the best of which are
reported as follows: |
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PIN AND V BLOCK
(Falex Test)
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Back to Vitro-Lube NPI-1220 | Home Call Toll Free (800) 240-7287 National
Process Industries, Inc. |