Lathe Operations: Facing

Image
Facing Operations Facing is the process of removing metal from the end of a workpiece to produce a flat surface. Most often, the workpiece is cylindrical, but using a 4-jaw chuck you can face rectangular or odd-shaped work to form cubes and other non-cylindrical shapes.

When a lathe cutting tool removes metal it applies considerable tangential (i.e. lateral or sideways) force to the workpiece. To safely perform a facing operation the end of the workpiece must be positioned close to the jaws of the chuck. The workpiece should not extend more than 2-3 times its diameter from the chuck jaws unless a steady rest is used to support the free end. Cutting Speeds

If you read many books on machining you will find a lot of information about the correct cutting speed for the movement of the cutting tool in relation to the workpiece. You must consider the rotational speed of the workpiece and the movement of the tool relative to the workpiece. Basically, the softer the metal the faster the cutting. D…

Introduction to Metallurgy

The single most used material today in the Industry is Metal. The reason for the increased use of the metals is due to its wide range of properties:




  • Lustre

  • Hardness

  • Low specific heat

  • Plastic deformability

  • Good thermal conductivity

  • Relatively high melting point

  • Strength

  • Ductility

  • Malleability

  • Opaquity

  • Stiffness

  • Rigidity

  • Formability

  • Machinability

  • Weldability

  • Castability

  • Dimensional stability



Metals are found in nature in the form of ores.  The science of metallurgy includes deriving the metals from its ores, its purification, alloying with other metals and finally manufacture into shape and forms usable in industries.



Definition: Metallurgy is a science and technology of:




  • Extracting metals from their ores.

  • Refining of crude metals.

  • Production of alloys to alter constituents and improve properties.

  • Studyingthe relationship of physical, thermal and mechanical treatment of metals and alloys.



Classification of Metallurgy: The study of metallurgy is classified in two major groups,




  • Chemical Metallurgy

  • Physical Metallurgy



Chemical Metallurgy: Chemical metallurgy deals with,




  • The extraction of metals from the ores in which they are found.

  • The process of mining, extraction and refining of metals and alloys that    can be used in industries.



Physical Metallurgy: Physical metallurgy deals with




  • The nature, structure and physical properties of metals and alloys, as well as their applications and behavior.

  • The physical behavior of the metals during shaping and treating   operations.

Comments

Popular posts from this blog

Lathe Operations: Step Turning

Lathe Operations: Plain Turning

What Is Capstan Lathe Machine?