Mechanical Engineering: Stamping and Pressing

Stamping Press

• A stamping press consists of a die set and a punch, used for blanking and punching operations.
• The process involves placing a strip of metal between the die and punch, and then the punch forces the metal into the die to create the desired shape.

Progressive Die

• A progressive die is a type of die that is used to perform multiple operations in a single press stroke.
• It is used to make complex parts, such as washers, by performing a series of operations in a predetermined sequence.

Mechanical Drive Stamping Press

• Mechanical drive stamping presses convert the rotation of a motor into linear motion of the ram.
• They are suited for blanking and punching operations.
• They produce high forces at the bottom of the stroke.

Hydraulic Drive Stamping Press

• Hydraulic drive stamping presses use a large piston and cylinder to drive the ram.
• They are suited for deep drawing operations.
• They have a longer ram stroke than mechanical drives and are slower than mechanical drives.

Bending

• Bending is a process that involves straining sheet metal around a straight axis to take a permanent bend.
• It can be performed using a V-die or a wiping die.

V-Bending

• V-bending is a type of bending performed with a V-shaped die.
• It is suited for low production and is performed on a press brake.
• V-dies are simple and inexpensive.

Edge Bending

• Edge bending is a type of bending performed with a wiping die.
• It is suited for high production and requires a pressure pad.
• Edge bending dies are more complicated and costly.

Springback

• Springback is the increase in included angle of a bent part relative to the included angle of the forming tool after the tool is removed.
• It occurs due to the elastic energy remaining in the bent part, causing it to recover partially towards its original shape.

Deep Drawing

• Deep drawing is a process that involves forming sheet metal into cup-shaped, box-shaped, or other complex-curved, hollow-shaped parts.
• A sheet metal blank is positioned over a die cavity and then a punch pushes the metal into the opening.
• It is also known as drawing.

Clearance in Drawing

• Clearance in drawing is the distance between the sides of the punch and die, and is given by c = 1.1t, where t is the stock thickness.

Blank Size Determination

• Blank size determination involves calculating the size of the blank required for a deep drawing operation.

Drawing Force Calculation

• Drawing force calculation involves calculating the force required to perform a deep drawing operation.

Sheet Metal Cutting

• Sheet metal cutting is a process that involves shearing of sheet metal between two cutting edges.

Shearing

• Shearing is a sheet metal cutting operation along a straight line between two cutting edges.
• It is typically used to cut large sheets.

Blanking and Punching

• Blanking is a sheet metal cutting operation that separates a piece (called a blank) from surrounding stock.
• Punching is similar to blanking, except the cut piece is scrap, called a slug.

This quiz covers the basics of stamping and pressing in mechanical engineering, including progressive dies, compound dies, and stamping press components. It also explores the power and drive systems used in hydraulic presses.