Which of the following metal produce discontinuous chips while machining?

Discontinuous types of chips are formed when hard and brittle metals like brass, bronze and cast iron is machined. Conditions which are responsible for the formation of discontinuous chips are: Low feed rate. Small rake angle of the tool.

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.

Which of these materials produce discontinuous chips?

Cast Iron, Hard Brass and other materials that produce a Powdery chip. “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 are the types of chips formed during machining?

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There are three types of chips produced during machining process:
i) Continuous chip:
ii) Discontinuous chip:
iii) Continuous chip with built up edge:

When discontinuous chips are formed?

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.

How Chips are formed?

Chips are formed due to tearing and shearing. In the process of chip formation by tear, the workpiece material adjacent to tool face is compressed and a crack runs ahead of cutting tool and towards the body of the workpiece. The chip is highly deformed and workpiece material is relatively under-formed.

Why discontinuous chips are formed?

How are chips formed in machining?

Chips are formed by shearing. Machining of material is highly dependent on chips. Chips are formed during the machining process. As the cutting tool engages the workpiece, the material ahead of tool is sheared and deformed under tremendous pressure.

Why discontinuous chips are 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.

Why discontinuous chips are produced during machining of hard & brittle materials?

Explanation: Discontinuous chips Discontinuous chips are usually formed during machining of brittle materials like cast iron. The low cutting speed and small rake angle of the tool are responsible for the formation of discontinuous chips.

Why discontinuous chips are produced while machining cast iron?

What are discontinuous chips in machining?

Discontinuous chips are also produced when cutting more ductile material with the use of a cutting fluid. These types of chips are produced when, machining more ductile materials. Due to large plastic deformations possible with ductile materials, longer continuous chips are produced.

What are the different types of chips in machining?

1) Discontinuous chips. 2) Continuous chips. If the chips during machining process is not continuous i.e. formed with breakage are called discontinuous chips. Discontinuous chips are formed when brittle or hard metals like brass, bronze and cast iron are used as workpiece in the machining process.

What are the characteristics of continuous chips?

Continous Chips are mainly formed during cutting of ductile material like mild steel, aluminium and copper. i) Material of Workpiece: When ductile material is used as the workpiece. ii) Cutting Speed: Cutting speed is high. iii) Chip thickness: Thickness of chip is less.

How are CNC chips formed?

https://www.youtube.com/watch?v=PrK2dsnXan4