The round tube polishing machine is mainly used for surface polishing of aluminum tubes, iron tubes, copper tubes and steel tubes. First of all, mechanical polishing relies mainly on manual work, so the current polishing process is still the main reason that affects the quality of polishing. In addition, it is related to the mold material, the surface condition before polishing, and the heat treatment process. High quality steel is a prerequisite for high polishing quality. If the surface hardness of the steel is not uniform or the characteristics are different, it often causes polishing difficulties. Various inclusions and pores in the steel are not conducive to the polishing of the round tube polishing machine.

The effect of different hardness on the polishing process. The increase in hardness increases the difficulty of grinding, but the roughness after polishing decreases. Due to the increased hardness, the polishing time required to achieve lower roughness is correspondingly increased. At the same time, the hardness is increased and the possibility of over-polishing is correspondingly reduced.

The surface condition of the workpiece affects the polishing process. During the crushing process of steel machining, the surface layer may be damaged by heat, internal stress or other factors, and improper cutting parameters may affect the polishing effect. The surface after EDM is more difficult to grind than the surface after ordinary machining or heat treatment. Therefore, the fine gauge quasi-electric spark should be used before the end of EDM, otherwise the surface will form a hardened thin layer. If the EDM is not properly selected, the depth of the heat affected layer can be up to 0.4mm. The hardness of the hardened layer is higher than the hardness of the substrate and must be removed. Therefore, it is better to add a rough grinding process to completely remove the damaged surface layer to form an average rough metal surface, which provides a good foundation for the polishing process of the round tube polishing machine.