1. Test materials andparameters
In this experiment, ZG35CrMo steel is selected as the material of mechanical bearing pedestal, and the size of cast bearing pedestal is 2360mm × 1640mm × 1280mm, wall thickness 52 ~ 256mm. The gravity gating system is selected as the casting process of the bearing pedestal, and its chemical composition is tested by spectroxepos X-ray spectrometer.
2. Casting process parameters
In order to improve the performance and quality of mechanical bearing pedestal, its casting process needs to be optimized. In this experiment, the gravity gating system is selected, and the system is applied to optimize the casting process parameters. In the specific casting process, the following casting parameters are selected: in the selection of pouring temperature, 1460 ℃, 1480 ℃, 1500 ℃, 1520 ℃, 1530 ℃, 1540 ℃ and 1560 ℃ are selected for research, and the unified pouring time is controlled, and the pouring time is controlled at 90s. In addition, in order to optimize the pouring time, the effects of different pouring time on the performance of mechanical bearing pedestal at the same temperature are studied. When pouring at 1530 ℃, the pouring time is controlled at 45s, 60s, 75s, 105s, 120s and 90s.
3. Test method
After the casting of the bearing pedestal is completed, the standard V-notch sample is made as the impact sample. After the impact test is completed, the condition of the sample is carefully observed by jsm6510 scanning electron microscope (SEM). The sample of wear test shall be made into 50mm × 10mm sample, and the wear test shall be carried out on MM200 wear tester. The parameters of MM200 wear tester are set as follows: rotating speed 400R / min, working pressure 100N, wear time 30min, and the whole experiment is carried out at room temperature. During the experiment, in order to ensure the accuracy and comparability of the test results, the wear materials should be kept consistent. After the experimental wear, the morphology was carefully observed by jsm-1 scanning electron microscope.