Relapping CBN Inserts

The simplest and least expensive way to refurbish CBN tooling inserts is to relap them. Relapping is a procedure in which the wear on the insert is measured and cleaned. These inserts can then be used again in their original holders. Another option is to reset the inserts.

CBN is a man-made material that is second in hardness only to diamond. It has excellent thermal and chemical resistance, which is useful for hard-to-machine materials. It is ideal for machining steel up to 70 HRC. The most common use for CBN inserts is in the machining of hard steel. It is the only practical and cost-effective solution for such materials.

CBN-I inserts wear out due to erosion of the CBN particle from the CBN matrix. CBN-II inserts are resistant to erosion, and they also exhibit higher hardness than their CBN-I counterparts. These materials have been shown to be better suited for high-volume operations, but the price tag is higher.

CBN inserts are available in many forms. For example, binderless CBN is suitable for titanium turning and interrupted cutting. In addition to titanium,  CBN inserts have been used in cast iron, hardened steel and powder metal interrupted cuts. The company is also developing inserts with different edge geometries and CBN particle-size formulations for a variety of industries.

The chamfered edged geometry of the inserts is the most common. The geometry of these inserts has been developed according to ISO standard A-40. It has an edge-to-edge chamfer and is 30deg x 0.1mm. The chamfered geometry is also useful for chip evacuation.

CBN inserts are hard and have been manufactured with extreme processes. Edge prep is a key part of the manufacturing process. Proper edge preparation will ensure smooth cutting and improve chip control. Without proper edge preparation, almost every tool has microscopic defects that can cause erratic performance.

PCD and CBN inserts are available with almost as many edge preparation styles as carbide inserts. They are grouped into 'land' types and offer different advantages in particular materials and cutting conditions.

The thrust force generated by CBN inserts depends on work-piece hardness and feed rate. Higher work-piece hardness produces higher thrust force. This force is significantly higher than tangential force. In addition, the CBN insert produces a greater thrust force during hard turning. This makes the CBN inserts more durable than ordinary inserts.

Hot Tags: relapping cbn insert, China, suppliers, manufacturers, customized, wholesale, bulk, discount, quotation, made in China