Tools that have PCD and CBN inserts tend to be retentive. However, they require a sharpening every once in a while. As compared to traditional tool materials, there is a different approach in sharpening PCD and CBN tools, which is based on grinding wheel characteristics and grinding methods. You can order it from solid cbn inserts manufacturers. To make sure that the sharpening process of PCD and CBN tools is done under suitable conditions, it is imperative to consider the following factors:
- High-precision grinding machine that has a rigid construction, plus a vibration dampening system assure high-precision grinding.
- Specifically designed grinding wheels suitable for efficient and accurate machining guarantee an exceptional blade edge quality.
PCD and CBN Definition
PCD, which stands for polycrystalline diamond, is an extra-hard synthetic material that is used to produce cutting tools. It is made of very hard, micron-sized diamond grains. They are fastened together by metal bonds, and positioned on the sintered carbide base. This process allows manufacturers to come up with a product that has exceptional properties, which is widely used in machining.
PCD is primarily used in the machining of the materials such as copper, aluminum, ceramics, plastic, wood, laminates and rubber.
CBN, which stands for Cubic Boron Nitride, is a synthetic material used to make tools made similarly to PCD. However, it is made of cubic boron nitride (or CBN) grains rather than diamond grains. CBN is mainly used for the machining of materials like tool steels, high alloy steels and high-speed steels.
Wheel Shape and Dimensions
The grinding wheel shape is chosen based on its grinder construction, grinding task, machining conditions and chuck devices. The choice of wheel dimensions depends on grinder power, grinder dimensions, work-piece dimensions, protective shields and chuck device construction.
The most essential wheel selection criterion is the sharpened blade surface quality that is required. There are four grains used in grinding wheels to sharpen PCD and CBN inserts.
Other wheel parameters such as grain concentration, structure and hardness are chosen for users based on sharpened tool properties, machining type and the grinder used.
Choice of Machining Parameters
When PCD and CBN inserts are being sharpened, you have to carefully choose the machining parameters. Even if a diamond grinding wheel is a technically advanced product, it will not be efficient without the right machining parameters or working conditions.
When the wheel is too stiff, the grinding velocity should be reduced to 14 – 18 m/s, while the wheel should be dressed more often. On the other hand, when the wheel easily wears out, the grinding velocity should be increased to 21 – 30 m/s.
How To Choose A Grinding Wheel?
Identify the geometric parameters like the type of wheel, its dimensions and bore diameter. Choose the abrasive and grain size type, wheel structure and hardness based on preferred grinding performance. You can buy to use it practically.