1. Impact performance
After the impact test, it is found that the impact absorption energy of the bearing pedestal increases first and then decreases with the increase of temperature. When the pouring temperature is 1460 ℃, the impact test results show that the impact energy absorption of the sample is 69j, and the test results show that the impact performance is the worst at this time; When the casting temperature is 1480 ℃, the impact test results show that the impact energy absorption capacity of the sample is 75j, which is higher than that before; When the casting temperature is 1520 ℃, the impact test results show that the impact energy absorption capacity of the sample is 88j, and the impact energy absorption capacity is significantly improved compared with that before; When the casting pouring temperature is 1530 ℃, the impact test results show that the impact energy absorption capacity of the sample is 97j, which is also the maximum impact energy absorption of the sample shown by the test results. Then, with the increase of casting pouring temperature, the impact energy of the sample decreases. When the casting pouring temperature is 1540 ℃, the impact test results show that the impact energy absorption capacity of the sample is 91J. According to the impact test results, in order to make the mechanical bearing pedestal show the best impact performance, the temperature should be controlled at 1530 ℃.
After determining the best impact property of mechanical bearing pedestal at 1530 ℃, the influence of different casting time on the impact property of the sample is analyzed. It is found that with the extension of casting time, the impact property also increases first and then decreases. When the casting time is 45s, the impact test results show that the impact absorption energy is 61j; When the casting time is 60s, the impact test results show that the impact absorption energy of the specimen is 68J; When the casting time is 75s, the impact test results show that the impact absorption energy is 79j; Under the condition that the casting pouring time is 90s, the impact test results show that the impact absorption energy of the experiment is 97j, which is also the maximum impact absorption energy obtained from the impact test results of the test piece, that is, the impact performance of the test piece is the best under the casting pouring time of 90s. With the continuous extension of time, the impact test results show that the impact absorption energy of the test piece decreases gradually. At the same time, the scanning results of scanning electron microscope show that the impact port of the specimen cast at 1530 ℃ is the thinnest and deepest, which also shows that the specimen cast at 1530 ℃ has the best impact performance.
2. Wear resistance
The influence of casting temperature on the wear resistance of the specimen first decreases and then increases with the increase of temperature. When the casting temperature is 1530 ℃, the wear volume of the specimen is 14 × 10-3mm3. The wear volume of the test piece is 17 at the casting pouring temperature of 1520 ℃ and 1540 ℃ respectively × 10-3mm3 and 18 × 10-3mm3。 Then the influence of casting time on the wear of specimens is studied. It is found that it also shows a trend of first decreasing and then increasing with the extension of time. When the casting time is 90s, the wear volume of specimens is the smallest, which is 14 × When the casting time is 75s and 105s, the wear degree of the test piece is 28 respectively × 10-3mm3 and 20 × 10-3mm3。
It can be seen from the comprehensive experimental results that the impact performance and wear performance of the bearing pedestal reach the best when the casting pouring temperature is 1530 ℃ and the casting pouring time is 90 s. therefore, it can be determined that the best casting pouring temperature of the bearing pedestal is 1530 ℃ and the best casting pouring time is 90 s.