KRL-10H Dual Function Testing Machine Cone Roller Bearing Shear Testing Machine+extreme pressure four ball machine
Brief introduction：The shear test (KRL) for tapered roller bearings is one of the widely used
One、 Product Introduction:
1.Dual function testing machine - KRL test:
(1). Using a conical roller bearing test machine, under test conditions similar to a gearbox, the lubricating oil is subjected to mechanical shear stress, causing permanent viscosity loss. The viscosity shear safety of the lubricating oil is expressed based on the decrease rate of the kinematic viscosity before and after the lubricating oil test.
The shear test (KRL) for tapered roller bearings is one of the widely used shear test methods in domestic and foreign standards. Compared with other shear tests, this method has the characteristics of more obvious shear effect and higher test severity, making it an ideal test method for evaluating the shear stability of heavy-duty oil products. This experiment was conducted under extreme pressure conditions of 5000N, and the tested oil was subjected to 20 hours of shear using SKF32008XQ tapered roller bearings at a speed of 1475 rpm. The shear stability of the oil was evaluated by measuring the viscosity loss of the oil before and after shear.
(2). Test method
◇ NB/SH/T 0845-2010
Measurement of viscosity and shear stability of transmission lubricants - Cone roller bearing testing machine method
◇ CEC L-45-A-99
Sensitivity Shear Stability of Transmission Lubricants
◇ DIN 51350-6
Testing of lubricants - Testing in the Shell four ball tester - Part 6: Determination of shear stability of lubricating oil containing polymers
In the KRL test with a load of 5000N, the actual load fluctuation does not exceed 50N, which meets the standard requirements of NB/SH/T 0845-2010 Measurement of viscosity shear stability of transmission lubricants - Cone roller bearing testing machine method, and also meets the design requirements of the force application structure of the four ball machine.
2. Dual function testing machine - four ball test:
(1). The four ball testing machine evaluates the load-bearing capacity and wear resistance of lubricants (lubricating oil, grease, etc.) under point contact extreme pressure conditions in the form of sliding friction. It measures important quality indicators such as the maximum non biting load PB value (representing oil film strength), sintering load PD value (representing the extreme working capacity of the lubricant), comprehensive wear value ZMZ (an index of the lubricant's resistance to extreme pressure), and analyzes the temperature characteristics of the lubricant, as well as the influence of temperature and time on the lubricant's lubrication performance (friction).
(2). Testing methods
GB/T12583-98, Determination of Extreme Pressure Performance of Lubricants (Four Ball Machine Method);
GB3142-2019, Method for determining the load-bearing capacity of lubricants (four ball method);
SH/T0189-92, Determination of Wear Resistance of Lubricating Oils (Four Ball Machine Method);
SH/T0202-92, Determination of Extreme Pressure Performance of Lubricating Greases (Four Ball Machine Method);
SH/T0204-92, Determination of Wear Resistance of Lubricating Greases (Four Ball Machine Method)
ASTM D 4172-94R04E1 Test Method for Friction and Wear of Lubricating Oils (Four Ball Method)
The appearance reference image is shown in the following figure
Two、 Main technical parameters:
1. Main technical parameters of the dual function testing machine KRL test project:
Number | Technical projects | function |
1 | Driving method | direct drive |
2 | Loading method | Fully automatic loading |
3 | Test load | 98~9800 [N] |
4 | Spindle radial runout | ≤ 0.01 [mm] |
5 | power | servo motor |
6 | Motor power | 2 [KW] |
7 | Spindle speed [r/min] | 50-3000; |
8 | Axis operation control mode | Manual control, time control, limited friction force, limited friction coefficient |
9 | Heating and cooling circulation temperature control system equipment | Thermostatic equipment, temperature controlled at 0.02 ℃ |
10 | KRL oil cup heating range [℃] | -10~120 ℃ |
2. Main technical parameters of the dual function testing machine - four ball machine:
Number | Technical projects | Function |
1 | ★Evaluation indicators | Mixing PB, PD, ZMZ, and long grinding D values does not affect the test results |
2 | ▲ Relative error of test force indication | ± 1% |
3 | ★ Clamp | There is a pre tightening force, which needs to be matched with a pin shaft and a tightening nut for locking |
4 | Heating range of four ball oil cup | Room temperature~200 [℃] |
5 | Friction process curve | Friction force and friction coefficient curve |
6 | Wear spot measurement accuracy | 0.01 [mm] |
7 | ★ Evaluation method | Wear spot measurement combined with friction coefficient, fast speed |
8 | Adaptation standards | GB, ASTM, SH/T, ISO, DIN, etc |
9 | ★ Collect maximum value | Collect the maximum values of friction force and coefficient of friction, and determine whether the oil film has ruptured. |
10 | ★ Pressure sensor | 2kg and 50kg, fixed on the machine simultaneously |
11 | Friction measurement [N] | 0-500N; 0~10000N, two separate detections |
