According to the above process, the test results of chemical composition, mechanical properties and microstructure ofpunch disc are shown in Table 1, table 2 and figure 1.
|Performance||Tensile strength /MPa||Elongation (%)||Graphite grade||Spheroidization rate|
|Requirement||≥ 420||≥ 5||≥ 4 grade||≥ 90|
The test results show that the performance of the disc cast test block attached to the ductile iron punch meets the technical requirements, and the first piece is verified to be free of casting defects by machining. The finished disc of the ductile iron punch is shown in Figure 2, and itsis finally solidified after passing the process evaluation.