Chapter 19: Sheet Metalworking

These flashcards cover key concepts from Sheet Metalworking, including definitions of processes, types of presses, and operational factors.

Sheet Metalworking

A process including cutting, bending, and drawing of thin sheet metals (0.4 mm to 6 mm) at room temperature.

Press

A machine used for cold and hot working of sheet materials, comprising a frame that supports a bed and a ram.

Types of Presses

Classified based on power sources such as mechanical, hydraulic, steam, and manual.

Single Crank Drive

The most common drive mechanism for presses, utilizing harmonic motion with maximum velocity at mid-stroke.

Eccentric Drive

A type of press drive characterized by crank motion, short strokes, and greater rigidity.

Hydraulic Press

A press that operates using large pressures at low speeds, typically used for heavy-duty applications.

Shearing

The process of cutting metal using blades, requiring proper clearance to avoid tearing or warping.

Blanking

The operation of cutting an entire piece off the sheet metal.

Piercing

The process of cutting a hole in sheet metal, where the material within the hole is considered waste.

V-bending

A low production bending operation performed on a press brake, limited to angles of 90 degrees or less.

Spring-back

The elastic recovery of a material after bending, which can be corrected by over-bending.

Clearance for Blanking

The specified space between the punch and die required for efficient cutting, varying by material type.

Factors for Selection of Press

Includes type of operation, part size, power required, and speed of operation.