Automatic solution for lithium base lipid extreme pressure four ball test
All greases have pressure resistance, and grease with extreme pressure additives, the general extreme pressure performance is better, can not say that the grease has extreme pressure performance.
Index, generally look at extreme pressure PB value, the greater the value, the higher the load resistance, that is, the better the extreme pressure performance, according to GB/T7323-2008 < Extreme pressure lithium base lubricating ester & GT; According to the four-ball method to detect PB value, the standard requirement is not less than 588N.
Methods the profile
Three steel balls with a diameter of 12.7mm were clamped in an oil box and covered by test oil. Another steel ball with the same diameter was placed on the top of the three balls and subjected to 147N(coincidence) or 392N(40kGF) force to become "three-point contact". When the oil test reaches a certain temperature (75℃ and 20C), the ball is rotated at a certain speed for 60min. The anti-wear performance of the oil test is evaluated by the average diameter of the three balls.
SH120 automatic four ball machine grease extreme pressure performance test is in the form of sliding friction, under extremely high point contact pressure conditions, mainly used to assess the bearing capacity of lubricants. In practical application, different evaluation indexes can be selected according to different uses of lubricants. These indexes include Pb, Pd and ZMZ. The four-ball friction testing machine can also do lubricant long-term wear resistance test, determine friction coefficient, record friction and temperature curves. Equipped with a special spot measurement system, it can realize the calculation screen display, measurement and recording of friction pair spots. With special accessories, the end face can also be made
Simulation test of friction and material. This machine design principle absorbs the lever four ball machine loading stability on the basis of combining the servo valve loading characteristics, through the servo motor, air spring, closed-loop control software to achieve automatic zero clearance, self
Dynamic loading, automatic hold, automatic test, automatic unloading, automatic measurement of spot diameter and photo, one key operation
Data storage, one-click storage test speed, minimal error, good repeatability, no pollution, no noise, high efficiency.
GB/T12583-98, determination of extreme pressure performance of lubricants (four ball machine method); Gb3142-82, determination of bearing capacity of lubricants (four ball method); SH/T0189-92, Determination of anti-wear properties of lubricating oil (four ball machine method); SH/T0202-92, determination of extreme pressure performance of grease (four ball machine method); SH/T0204-92, determination of wear resistance of greases (four ball machine method).
Zbe34007-87 (Four ball test method for wear resistance)
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