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Surface analysis of the gear test piece The gear working surface was cut with a wire cutter, cleaned, and sent to the PHI550ESCAPSAM surface analyzer produced by American PE Company for surface composition analysis. Experimental conditions: Ep (primary electron beam beam pressure) = 3 keV, Ip (primary electron beam current) = 1.0LA, Iv (argon ion etching voltage) = 1.5kV, II (argon ion current density) = 35LAPcm2, etching rate is 35APmin.
The hardness of the gear test piece is due to the large surface peeling of the gear surface with VG68 mechanical oil as the lubricating oil. Therefore, the surface hardness test of the gear test piece is not performed, only the working surface of the gear test piece using the borate additive is not The working face and the end face are tested at multiple points, and the results are as shown.
Gear test results using borate additives. The test results of the micro-hardness of the non-working face end face pinion of the working face of the sample No. working face can be clearly seen that the microhardness of the non-working face is significantly higher than the microhardness of the end face, which is Because the non-working surface is in the process of the tooth shape, the surface hardening layer appears as a result of the cold work hardening phenomenon. The microhardness of the working surface is significantly higher than the microhardness of the non-working surface because the boron element penetrates into the gear surface to form a modified layer. The microhardness of the working face of the large gear is obviously higher than the microhardness of the pinion. This is because the working conditions of the large and small gears are different. It can be inferred that the influence of the working condition on the penetration of boron into the friction surface is It is vital. The surface microhardness of LD752 was measured after long-running experiments on a four-ball machine with lanthanum dialkyldithiophosphate (LaDTP) and borate ester (OB) reported in [6] and [11]. The experimental results are nearly doubled. This may be mainly because the experimental conditions are different, the contact forms of the friction pairs are different, and one is a standard laboratory experiment, and the other is a bench experiment close to the actual use, which is greatly affected by various external conditions. . At the same time, one of the additives used is an inorganic borate and the other is an organic borate. But it should be noted that the results are consistent.
The condition of the surface damage of the gear was stopped at the input torque of 8.59 Nm and the input speed was 3000 rPmin. Observing the surface of the gear test piece, it was found that the surface of the gear with the boron-containing additive lubricant was very smooth, but the groove appeared at the pitch line. The groove (on the drive wheel) or the ridge (on the driven wheel), and a large area of ​​peeling occurs on the surface of the gear with ISOVG68 mechanical oil as the lubricating oil. It can be seen that the borate additive has good anti-flaking properties.
The large gear Auger electron energy (AES) spectrum can be seen from the above, the surface of the gear test piece mainly contains C, O, S, Fe and B elements, but the relative atomic concentration of iron is relatively small, about 10, carbon The relative atomic concentration is as high as 50, indicating that an effective lubricating film has been formed on the gear surface. As the etching progresses (etching for 9 min), the relative atomic concentration of C decreases rapidly, the relative atomic concentration of iron increases, and the gear matrix is ​​exposed, but the relative atomic concentration of S and B is almost constant. It shows that the S element reacts with iron to form a chemical reaction film to lubricate, and the B element penetrates into the surface of the gear to form a modified layer, which improves the performance of the gear surface. The results of this surface analysis are reported in the literature [6] using organoborate ester (OB) added to mineral oil base oil (VG68), and the chlorine derivative of borate ester reported in [11] (B) ))) After the long grinding experiment on the four-ball machine in the lubricating oil, the Auger electron energy (AES) spectrum of the wear spot is extremely similar.
Analysis and discussion From the results of the above experiment 1, it can be seen that the action mechanism of the inorganic borate as a gear lubricant additive to lubricate the gear pair is completely consistent with the mechanism of action on the four-ball machine and the ring block machine, although the experiment and the gear are carried out on the experimental machine. When the sub-test bench is compared, the operation is more standardized and there are fewer uncertain factors, so that the relative atomic concentration of boron which penetrates into the surface of the test piece is higher and the surface hardness is higher. It is also confirmed from the experimental results that the on-line reinforcement of the gear is indeed feasible within a certain range.