If you're considering a PCD INSERT, you've probably been wondering what to expect from the process. While the process of machining PCD inserts is relatively straightforward, the fact that they are subject to thermal fracture can make them a challenge to use. Luckily, there are several things you can do to help keep your insert in good shape and increase its life. Here are some things you should keep in mind.
First of all, you should know that PCD INSERT are made of synthetic diamond and cannot be used on ferrous materials. Iron carbide can form on the PCD cutting edge at temperatures over 700 degrees Fahrenheit, making the diamond structure collapse. If your metal is made of aluminum that has more than 5 percent silicon content, a PCD insert is required. These two facts should not be confused.
Polycrystalline diamonds (PCD) are the hardest substance known to man. PCD is produced by sintering diamond particles with a metal matrix. The result is a high uniform hardness and high abrasion resistance. In the same way, PCD tool blanks have a high abrasion resistance in all directions. The result is a sharp, durable cutting tool with a superior surface finish.
CBN is also available in various grades. CBN inserts are often blended with binders to change their properties. The crystal structure can be manipulated for specific machining needs. The hardest CBN combination is a high CBN content with ultrafine grain sizes. It is also possible to coat a CBN insert with another material. For example, medium-grain CBN inserts coated with TiCN are recommended for machining hardened steels and casting iron.