Carry out the research on the influence of tin in gray cast iron on its performance. First, carry out the machining performance of the gray cast iron cylinder body (precision ingot, roughness of 3.2 μ m) The machining performance evaluation mainly refers to the number of cylinder blocks processed by each tool (the same cutting speed, the same cutting thickness). Then the mechanical properties (hardness + tensile strength) of grey cast iron cylinder with different Ti content were tested. Finally, the metallographic structure of grey cast iron samples with different mechanical properties was observed, especially the size and magnitude distribution of tin particles. The table shows the effect of tin in gray cast iron on its mechanical properties and processability.
|Serial number||C(wt%)||Si(wt%)||Ti(wt%)||Tin content (PCS /mm2)||Hardness (HB)||Tensile strength (MPa)||Cutting performance (pieces / tool)|
According to the table, with the increase of Ti content in grey cast iron, the tin content in grey cast iron also increases. The increase of tin content has little effect on the hardness of gray cast iron, but it will significantly reduce the tensile strength and processability of gray cast iron. When the content of tin is less than 87 / mm2, the mechanical properties of gray cast iron are better, which can reach more than 250Mpa. At the same time, the number of castings that can be processed by each tool is significantly increased, which reflects its better cutting performance.