Edge preparation is a key factor in tool performance, in order to avoid edge breakage due to high loads when cutting hard materials.
According to different materials and working conditions, to achieve the ideal machining quality, surface roughness and tool life, it is necessary to do appropriate edge treatment on the insert.
1. S type (chamfering + grinding)
S-shaped edge treatment, chamfering + blunt round treatment. This form is the most common edge treatment and the preferred edge type in hard turning. It has higher strength than T-type, is more resistant to chipping and cracking, easier to predict tool life, and can produce more stable workpiece surface quality. Especially suitable for large depth of cut and intermittent machining.
2. T type (chamfered edge)
T-shaped edge treatment, chamfered but not blunt round treatment. Through chamfering treatment, it has better impact resistance, and can replace the S-shaped edge in the case of reducing cutting force and high tolerance requirements.
General-purpose edge treatment form
Compared with the S type, it has relatively small cutting resistance and stable dimensions, which is suitable for occasions requiring tighter tolerances.
First choice for cast iron cutting
3. E type (grinding)
E-type edge treatment, no chamfering treatment, blunt round treatment. The edge type adopts the blunt round process, which eliminates the machining micro-defects on the cutting edge, strengthens the cutting edge, and increases the resistance to chipping and cracking.
Finely ground cutting edge effectively resists chip impact
To ensure a smooth cutting process and prevent breakage, the feed rate needs to be greater than the grinding size
The first choice for high temperature alloy finishing
4.F type (without chamfering and grinding)
F-type cutting edge treatment, that is, neither chamfering nor blunt rounding. This cutting edge treatment method is sharp, with small cutting force, small shear deformation and low cutting heat. Smaller cutting resistance is beneficial to reduce surface roughness, suitable for finishing occasions. However, the strength of the cutting edge is low, and the cutting edge has initial defects, so it is rarely used.
In addition to the above 4 different edge types, which have different characteristics in the cutting process, there are also some PCBN inserts that have undergone special processes, which also have their own advantages in the process of use.
Ⅰ. Chip breaker
Excellent chip handling
A variety of unique chip breaker geometries for various steel chip handling
Ⅱ. WIPER type
Excellent surface quality comparable to grinding
Better surface quality at the same feed
Higher feed rate while maintaining surface quality, greatly improving machining efficiency
Recommended for continuous processing
Note: Not suitable for profiling; suitable for highly rigid machine tools and workpieces
Ⅲ. Specially coated blade
The perfect combination of smooth coating and CBN base metal can achieve better cutting performance and improve machining accuracy and life.
Ⅳ. Specially coated blade
Balance of strength and toughness, better wear resistance and chipping resistance, suitable for continuous and intermittent mixed conditions.
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---POST: Cynthia Lee
