Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process
Abstract
:1. Introduction
2. Experimental Setup and Procedure
2.1. Workpiece Material
2.2. Experimental Setup
2.3. Measuring Equipment
3. Experimental Results and Discussion
3.1. Grinding Temperature
3.2. Characteristics of Grinding Burn
3.3. Microhardness and Surface Roughness Variation
4. Conclusions
- (1)
- The grinding temperature increased with the grinding depth and grinding speed, with the highest level of ~290 °C. The feed speed presented the most significant effect on grinding temperature with the corresponding percentage contribution ratio of 33.7%. Both work hardening and thermal softening were observed during grinding of quenched gear samples, and aggressive grinding parameters intensified the thermal softening effect, resulting in a reduction in microhardness within the subsurface layer.
- (2)
- The thickness of the white layer exceeded 100 μm when the grinding depth increased to 0.03 mm and it could be subdivided into three different layers owing to the contribution of mechanical extrusion and the thermal effect. The top layer mainly featured plastic deformation and the second one was composed of fine-grained martensite. Coarse-grained acicular martensite was found at the interface between the white layer and the softened dark layer.
- (3)
- The ground surface topography showed several scratches and typical grooves and some particles were embedded into the ground surface, which was probably caused by the shedding and breaking of abrasive particles. When the grinding depth increased to 0.03 mm, the grinding surface roughness (Sa) was relatively high and reached up to ~0.60 μm. The percentage contribution ratio of the grinding depth on surface roughness was higher than 50%, mainly owing to severe plastic deformation under grinding wheel extrusion and the thermal effect.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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C | Si | Mn | Cr | Ni | Fe | S |
---|---|---|---|---|---|---|
0.17–0.23 | 0.17–0.37 | 0.30–0.60 | 1.25–1.65 | 3.25–3.65 | ≥95.00 | ≤0.03 |
Feed Speed (m/s) | Grinding Speed (m/s) | Grinding Depth (mm) | Number of Passes |
---|---|---|---|
0.19 | 26 | 0.02 | 12 |
30 | 0.02 | 12 | |
0.03 | 8 | ||
34 | 0.02 | 12 | |
0.03 | 8 | ||
0.26 | 26 | 0.02 | 12 |
30 | 0.02 | 12 | |
0.03 | 8 | ||
34 | 0.02 | 12 | |
0.03 | 8 | ||
0.35 | 26 | 0.02 | 12 |
30 | 0.02 | 12 | |
34 | 0.02 | 12 |
Source | DOE | Adj SS | Adj MS | F | PCR |
---|---|---|---|---|---|
Feed speed (m/s) | 2 | 14,512 | 7255.8 | 8.22 * | 33.7% |
Grinding speed (m/s) | 2 | 2975 | 1487.5 | 1.69 | 3.2% |
Grinding depth (mm) | 1 | 5794 | 5793.6 | 6.56 * | 13.0% |
Error | 7 | 6178 | 882.5 | 50.1% | |
Total | 12 | 37,832 | 100% |
Source | DOE | Adj SS | Adj MS | F | PCR |
---|---|---|---|---|---|
Feed speed (m/s) | 2 | 0.002239 | 0.001120 | 2.06 | 5.1% |
Grinding speed (m/s) | 2 | 0.000652 | 0.000326 | 0.60 | 0% |
Grinding depth (mm) | 1 | 0.012133 | 0.012133 | 22.35 * | 51.0% |
Error | 7 | 0.003801 | 0.000543 | 43.9% | |
Total | 12 | 0.022745 | 100% |
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Jiang, X.; Liu, K.; Yan, Y.; Li, M.; Gong, P.; He, H. Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process. Materials 2022, 15, 7723. https://doi.org/10.3390/ma15217723
Jiang X, Liu K, Yan Y, Li M, Gong P, He H. Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process. Materials. 2022; 15(21):7723. https://doi.org/10.3390/ma15217723
Chicago/Turabian StyleJiang, Xiaoyang, Ke Liu, Yong Yan, Maojun Li, Pan Gong, and Hong He. 2022. "Grinding Temperature and Surface Integrity of Quenched Automotive Transmission Gear during the Form Grinding Process" Materials 15, no. 21: 7723. https://doi.org/10.3390/ma15217723