When determining the cutting parameters for cubic boron nitride (CBN) inserts, it is essential to comprehensively consider multiple factors, including the characteristics of the workpiece material, the type and geometry of the insert, machine tool performance, and desired machining quality. Below are key cutting parameters and their determination methods:
1、Cutting Speed (Vc)
Definition: The instantaneous velocity of a selected point on the cutting edge relative to the primary motion direction of the workpiece.
Determination:
Select based on the material properties of the CBN insert and the hardness of the workpiece.
CBN inserts typically operate at high cutting speeds. For example:
Cast iron: 400–1200 m/min
Hardened steel: 60–200 m/min
2、Feed Rate (f)
Definition: The actual displacement of the tool in the feed direction relative to the workpiece.
Determination:
Determined by machining accuracy and surface roughness requirements.
Typical feed range for CBN inserts: 0.1–1.0 mm/rev.
3、Depth of Cut (ap)
Definition: The maximum dimension of the cutting layer perpendicular to the feed direction.
Determination:
Selected based on workpiece material strength and tool rigidity.
Examples:
Roughing for large components (e.g., mining machinery, rolls): 5–10 mm
4、Insert Material and Geometry
Selection:
Choose CBN insert materials and geometries according to the workpiece material and machining requirements.
Common structures include solid sintered, fully welded, composite, and brazed inserts, each with specific parameter ranges.
5、Cutting Fluid
Application:
Determine usage based on machining conditions and materials.
CBN inserts generally perform well in dry cutting, but cutting fluid may enhance efficiency and tool life in specific cases.
Cutting parameters should be adjusted based on actual machining conditions. Optimal parameter combinations can be identified through experimentation and experience to achieve efficient, high-quality machining.
