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Method for measuring lubricating grease drop point

A grease and dropping point technology, applied in the investigation phase/state change and other directions, can solve the problems of poor data repeatability and large errors, and achieve accurate and reliable experimental basis, convenient operation and implementation, and better repeatability.

Active Publication Date: 2010-08-04
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for testing the dropping point of lubricating grease, which overcomes the shortcomings of large errors and poor data repeatability in the prior art, and can effectively avoid the instrument size and installation, heating speed, and gravity in the existing method. and other factors

Method used

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  • Method for measuring lubricating grease drop point

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The grease sample used is "II-9TC Grease" produced by Tianjin Shixun Industry and Trade Co., Ltd., provided by Tianjin Chengke Transmission Electromechanical Technology Co., Ltd. Using the standard GB / T 4929 to measure the dropping point, the result is 190°C.

[0035] (1) Using a StressTech rotational rheometer, select a parallel plate accessory with a diameter of 20mm, add a semi-solid grease sample to the lower plate of the selected parallel plate at 25°C, and press down the parallel plate, Control the distance between the upper and lower plates to 1mm, remove excess samples around the upper and lower plates, and keep the samples just filled between the upper and lower plates;

[0036] (2) Apply a sine wave periodic shear stress to the sample through the rheometer control software, the control frequency is 1Hz, the periodic shear stress gradually increases from 1Pa to 2000Pa, and the storage modulus of the sample is measured at 25°C and the loss modulus change curves...

Embodiment 2

[0040] The grease sample used is "3# general lithium base grease" produced by Tianjin Shixun Industry and Trade Co., Ltd., provided by Tianjin Chengke Transmission Electromechanical Technology Co., Ltd. It was tested by the method GB / T4929 of the grease dropping point measurement method in the product standard GB7324-94, and the result was 116°C.

[0041] (1) Using a StressTech rotational rheometer, select a parallel plate accessory with a diameter of 20mm, add a semi-solid grease sample to the lower plate of the selected parallel plate at 25°C, and press down the parallel plate, Control the distance between the upper and lower plates to 1mm, remove excess samples around the upper and lower plates, and keep the samples just filled between the upper and lower plates;

[0042] (2) Apply a sine wave periodic shear stress to the sample through the rheometer control software, the control frequency is 1Hz, the periodic shear stress gradually increases from 1Pa to 1500Pa, and the sto...

Embodiment 3

[0046] The grease sample used is "3# general lithium base grease" produced by Tianjin Shixun Industry and Trade Co., Ltd., provided by Tianjin Chengke Transmission Electromechanical Technology Co., Ltd. It was tested by the method GB / T4929 of the grease dropping point measurement method in the product standard GB7324-94, and the result was 116°C.

[0047] (1) Using a StressTech rotational rheometer, select a parallel plate accessory with a diameter of 20mm, add a semi-solid grease sample to the lower plate of the selected parallel plate at 25°C, and press down the parallel plate, Control the distance between the upper and lower plates to 1mm, remove excess samples around the upper and lower plates, and keep the samples just filled between the upper and lower plates;

[0048] (2) Apply a sine wave periodic shear strain to the sample through the rheometer control software, the control frequency is 1Hz, the periodic shear strain is gradually increased from 0.0001 to 3, and the st...

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Abstract

The invention discloses a method for measuring lubricating grease drop point. The method comprises the following steps of: for the lubricating grease at normal temperature, applying a periodic shearing action at certain frequency, gradually increasing the amplitude of a stress or strain; according to a dynamic mechanical behavior shown by the lubricating grease, determining a linear viscoelastic range in which the lubricating grease has basically constant energy storage modulus and loss modulus; and selecting a certain stress value or strain value in the linear viscoelastic range, maintaining the same frequency, heating the lubricating grease by a certain program, measuring the temperature at which energy storage modulus of the lubricating grease is reduced to be equal to the loss modulus, and using the measured value as the drop point of the lubricating grease. The measurement method of the invention has the advantages of effectively avoiding the interference of the size and mounting method of the instrument, the heating temperature, gravity of lubricating grease drops and the like existing in the conventional method for measuring the lubricating grease drop point, obtaining data result with higher repeatability and providing a more accurate and reliable experimental basis for the determination of the maximum service temperature of the lubricating grease or the selection of the lubricating grease under specific conditions.

Description

technical field [0001] The present invention relates to a test method, in particular to a method for testing the dropping point of lubricating grease. Background technique [0002] The dropping point of grease is a comprehensive expression of the melting temperature of grease thickener, heat softening of grease, oil separation of grease at high temperature, and gas generation of grease at high temperature. A certain fluidity temperature. By measuring the dropping point of the grease, the temperature at which the mechanical properties of the grease change can be known, and the maximum service temperature of the grease can be roughly determined. Generally speaking, the maximum operating temperature of grease should be 30-50°C lower than the dropping point. As one of the main judgment bases for judging the service temperature of grease, the dropping point of grease has important practical significance for the application of grease. For example, rolling bearings and sliding b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/04
Inventor 李景庆董慧鑫杨宇
Owner TIANJIN UNIV
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