XHL-21 Four Ball Friction Testing Machine

Computer control four ball friction testing machine, in the form of slide friction, is used for the loading capacity evaluation of lubricants in the high pressure point contact condition.

 It can test the maximum non seizure load PB, sintered load PD and composite wear value ZMZ of lubricants, also do lubricants long time friction resistance test, can measure coefficient of friction, If special accessories are used, an end-face wear test can also be conducted to measure the friction coefficient of the friction pair.

ASTM D4172: Standard Test Method for Wear Preventive Characteristics of Lubricating Fluid (Four-Ball Method)

ASTM D2266: Standard Test Method for Wear Preventive Characteristics of Lubricating Grease (Four-Ball Method)

ASTM D2783: Measurement of Extreme-Pressure Properties of Lubricating Fluids (Four-Ball Method)

ASTM D2596: Standard Test Method for Measurement of Extreme-Pressure Properties of Lubricating Grease (Four-Ball Method)

ISO 20623-2017: Determination of the extreme-pressure and anti-wear properties of lubricants - Four-ball method (European conditions)

ASTM D5183: Standard Test Method for Determination of the Coefficient of Friction of Lubricants Using the Four-Ball Wear Test Machine

SH/T0189

SH/T0202

SH/T0204

NB-SH-T0845 （CEC-L-045-99）

Host

The machine is primarily composed of the main shaft section, test section, cylinder piston section, oil source section, load control device, as well as strong current control section and weak current control section. The instrument operation control is controlled by PC.

The main shaft part is used to drive the upper sample steel ball to rotate. The test part is mainly used to fix the three sample steel balls below. The oil cylinder piston part, oil source part, and load control device are used to apply test force. The strong current control part is mainly used to control the power supply, frequency converter, static pressure oil pump motor, pressure oil pump motor, AC servo motor, reversible motor, and solenoid valve, etc., to achieve interlock control of the static pressure oil pump motor and pressure oil pump motor, and to provide power for the weak current. The weak current control part adopts an embedded system based on ARM, using a liquid crystal driver chip to control the display and refresh of the liquid crystal screen, and cooperates with button operations to complete functions such as parameter setting, loading, and running. It has a computer data acquisition serial interface.

Key Features:

1. This machine utilizes a zero-friction hydrostatic cylinder, ensuring high precision, long life use, more than 40 years.

2.  This machine adopts the German DOLI controller, ensuring more stable force, more accurate test results, and a lower failure rate!

3. This machine utilizes imported oil pipes and connectors, effectively preventing oil leakage and pressure relief issues from occurring

4. The machine equip a valve to quick adjust testing space for installing oil box.

5. The servo valve use German Bosch Rexroth for precision control.