What is a built-up edge in machining?
In single point cutting of metals, a built up edge (BUE) is an accumulation of material against the rake face, that seizes to the tool tip, separating it from the chip.
Why built-up edge is formed while machining?
Explanation: When machining ductile materials, conditions of high local temperature and extreme pressure in the cutting zone and also high friction in the tool chip interface, may cause the work material to adhere or weld to the cutting edge of the tool forming the built-up edge.
What are the causes and effects of formation of built-up edge BUE during machining of ductile materials?
Their low thermal conductivity leads to heat concentration in the cutting zone that results in high localized temperatures. In addition, their high work hardening leads to high adhesion of the workpiece material to the cutting tool, resulting unstable chip and built-up edge (BUE) formation [4].
What is a built-up edge in metal cutting what are the factors causing built-up edge formation?
The material in a built-up edge is work-hardened and abrasive. When pieces break away from the cutting tool they stick to the workpiece, causing damage to the surface. The larger the BUE, the rougher the resulting surface. Work hardened particles passing under the flank face can lead to flank wear.
How is built-up edge formed?
When the friction between tool and chip is high while machining ductile materials, some particles of chip adhere to the tool rake face near the tool tip. When such sizeable material piles up on the rake face, it acts as a cutting edge in place of the actual cutting edge. This is termed as built up edge (BUE).
How can build up edge formed during machining be avoided?
In general, built up edge can be reduced by:
- Increasing cutting speed.
- Decreasing feed rate.
- Increasing ambient workpiece temperature.
- Increasing rake angle.
- Reducing friction (by applying cutting fluid)
What do you mean by built-up edge Explain with a neat sketch?
Built Up Edge (BUE) is the accumulation of workpiece material onto the rake face of the tool. This material welds under pressure, and is separate from the chip. Because BUE changes the effective geometry of the tool, it can have either positive or negative effects.
How does a build up edge is formed?
What is the built up edge and why it is undesirable and how it can be reduced?
The tendency for built-up edge formation can be decreased by using a tool that has a lower chemical affinity towards the workpiece material. Built-up edge is undesirable because[Why a built up edge on a tool is undesirable?] Fluctuation in cutting force induces vibration that causes tool failure.
What is the built-up edge and why it is undesirable and how it can be reduced?
How is built up edge formed?
Why do you need a built up edge in metal machining?
The material in a built-up edge is work-hardened and abrasive. When pieces break away from the cutting tool they stick to the workpiece, causing damage to the surface. The larger the BUE, the rougher the resulting surface. Work hardened particles passing under the flank face can lead to flank wear.
How does a built up edge affect a cutting tool?
The build-up of material changes the geometry of the cutting tool. Including the rake angle. This change in geometry is ever-changing. So you lose dimensional control of the metal removal process. The material in a built-up edge is work-hardened and abrasive.
How are discontinuous chips formed in metal machining?
Clarification: Discontinuous chips are formed during machining of brittle metals while continuous chips with built up edge are formed during machining of ductile materials at low cutting speed. 6. The factor responsible for the formation of discontinuous chips is
What’s the difference between continuous chip and built up edge?
This type of chip is similar to continuous chip and it has a built up edge adjacent to the tool face and also is not as smooth as continuous edge. Actually, Built Up Edge (BUE) is an accumulation of material against the rake face, that siezes to the tool tip, seperating it from the chip.
