Which process is shown in the figure?

Which process is shown in the figure? Correct Answer Spinning

Explanation:
Spinning:

• It sometimes called spin forming, which is a metal forming process used to form cylindrical parts by rotating a piece of sheet metal while forces are applied to one side.
• A sheet metal disc is rotated at high speeds while rollers press the sheet against a tool, called a mandrel, to form the shape of the desired part.
• Spun metal parts have rotationally symmetric, hollow shapes, such as a cylinder, cone, or hemisphere.
• A spinning operation is carried out on Lathe.
• Examples include cookware, hubcaps, satellite dishes, rocket nose cones, and musical instruments.

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Shot peening:

• Shot peening is a cold work process used to finish metal parts to prevent fatigue and stress corrosion failures and prolong product life for the part.
• In shot peening, a small spherical shot bombards the surface of the part to be finished.
• The shot acts like a peen hammer, dimpling the surface and causing compression stresses under the dimple.
• The surface compression stress strengthens the metal, ensuring that the finished part will resist fatigue failures, corrosion fatigue and cracking, and galling and erosion from cavitation.

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Coining:

• It is a cold press working operation in which the starting material is in the form of a blank of sheet metal. Coining is a pressing operation, it does not base on metal deformation.
• It is essentially a cold forging operation expects for the fact that the flow of metal occurs only at the top layers and not the entire volume.
• Coining is a simple application of closed die forging in which fine details in the die impression are impressed into the top or/and bottom surfaces of the workpiece.
• Coining is the operation of the production of coins, medals, or other ornamental parts by squeezing operation.

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Embossing:

• A stamping process that produces a shallow relief design on sheet metal.
• Embossing is the operation of forming impressions of figures, letters, or designs on sheet metal.
• The punch or the die or both of them may have the design engraved on them which are formed on the sheet metal by squeezing and with the plastic flow of metal.

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