Why are discontinuous chips preferred over continuous chips?
As most of the heat generated carried out by the chip, temperature at the edge of tool is less, and longer life of tool is the result. For brittle material, discontinuous chip gives a fair surface finish, lower power consumption and increase tool life. Discontinuous chips are convenient to handle and dispose of.
What is difference between continuous and discontinuous chips?
Discontinuous chips are also produced when cutting more ductile material with the use of a cutting fluid. 2: Continuous Chips: Since it is stable cutting, resulting in generally good surface finish. On the other hand these chips are difficult to handle and dispose off.
What is discontinuous chip formation?
Discontinuous chips are formed when brittle or hard metals like brass, bronze and cast iron are used as workpiece in the machining process. Discontinuous chips are also formed in ductile material when the friction between tool and workpiece is high.
What are the two limitations of having discontinuous chip?
Disadvantages. When discontinuous chips are formed in the ductile materials, the workpiece result in poor surface finish and excessive wear and tear of the tool takes place.
What are the different reasons of forming discontinuous chips?
Cause of formation of discontinuous chip:
- Highly brittle material of work piece.
- Smaller bevel of cut tools.
- Lower cutting speed.
- Large feed, thick chip.
What does flank wear and crater wear mean?
flank wear in which the portion of the tool in contact with the finished part erodes. crater wear in which contact with chips erodes the rake face. This is somewhat normal for tool wear, and does not seriously degrade the use of a tool until it becomes serious enough to cause a cutting edge failure.
What is discontinuous chip?
It means chips become broken pieces before it departs from the cutter.It is often happened in high brittle materials, such as cast iron or bronze.
What should be the condition for continuous chips?
CONTINUOUS CHIP • Some ideal conditions that promote continuous chips in metal cutting are: – sharp cutting edge, – small chip thickness (fine feed), – large rake angle, – high cutting speed, – ductile work materials and – less friction between chip tool interface through efficient lubrication.
How do I reduce flank?
i) Flank wear can be prevented by reducing the cutting speed. ii) Reducing the feed and depth of cut. formation of built-up edge. iv) By using good quality of carbide in the cutting tool.
Why in face milling cutters some face wear occurs along with flank wear?
Flank wear occurs due to: Abrasion by hard particles and inclusions in the work piece. Shearing off the micro welds between tool and work material. Abrasion by fragments of built‐up‐edge ploughing against the clearance face of the tool.
What causes discontinuous chips?
“Discontinuous Chip – Discontinuous or segmented chips are produced when brittle metal such as cast iron and hard bronze are cut or when some ductile metals are cut under poor cutting conditions.
What is the definition of the term flank?
(Entry 1 of 2) 1a : the fleshy part of the side between the ribs and the hip broadly : the side of a quadruped She gently patted the horse’s flank. b : a cut of meat from this part of an animal — see beef illustration.
How are discontinuous chips formed in Mechanical Engineering?
Discontinuous chips are also produced when cutting more ductile material with the use of a cutting fluid. 2: Continuous Chips: Continuous chips are formed by the continuous plastic deformation of metal without fracture in front of the cutting edge of the tool and is formed by the smooth flow of the chip up the tool face.
How are continuous chips formed in a tool?
Continuous chips are formed by the continuous plastic deformation of metal without fracture in front of the cutting edge of the tool and is formed by the smooth flow of the chip up the tool face. Mild steel and copper are considered to be most desirable materials for obtaining continuous chips.
Which is the best material for continuous chips?
Mild steel and copper are considered to be most desirable materials for obtaining continuous chips. The chips obtained have same thickness throughout. This type of chip is the most desirable. Since it is stable cutting, resulting in generally good surface finish.
Do you know different types of chips in metal cutting?
Types of Chips. The various types of chips in metal cutting are. Continuous chips. Discontinuous chips &. Continuous chips with built-up edge (or BUE chips) Let’s discuss about them one by one. 1. Continuous Chips. If the metal chips formed during machining is without segments i.e. without breakage, then it is called as continuous types of chips.
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