Machining graphite requires specific techniques and methods to ensure high-quality results and protect both equipment and operators. Here are some key tips:
1.Cutting: Graphite is a relatively brittle material, which allows for cutting and machining using high-speed drills or diamond drills. During the cutting process, it is important to control the cutting speed and tool cooling to reduce the likelihood of graphite cracking or dissolving.
2.Grinding: Diamond grinding wheels are necessary for the grinding process of graphite to achieve high precision machining requirements. Attention should be paid to the tangential speed during grinding and the normal operating temperature of the tool to prevent overheating.
3.Heat Treatment: The hardness and strength of graphite vary with its grain size and purity. Common heat treatment methods include high-temperature cleaning, low-temperature annealing, and water quenching. Among these, high-temperature cleaning is crucial for removing surface impurities and increasing the size of graphite crystals.
4.Stretching: The mechanical properties of graphite are related to the orientation of its grains. Graphite grains are generally flaky, and the bonding force between the graphite flakes is relatively weak, resulting in a layered structure. During stretching, it is important to maintain the alignment between the stretching direction and the grain orientation to fully utilize the characteristics of graphite.
5.Laser Machining: Laser machining is a new technique for processing graphite, capable of achieving high precision and efficient machining. During laser machining, it is essential to control the laser power, scanning method, and localized cooling to ensure processing quality and tool longevity.