TU12_BendingFundamentals Vocab

Question 1

Bottom Bending

Answer 1

A forming method in which the die tooling touches down on all surfaces of the workpiece. Bottom bending is also called bottoming.

Question 2

Coining

Answer 2

A forming method that uses extreme force to displace material, usually by a reduction in workpiece thickness.

Question 3

Lead-In Radii

Answer 3

The points that make the first contact with the workpiece on press brake tooling. The inside radius of a workpiece is often dependent upon the dimensions of the lead-in radii.

Question 4

Press Brake

Answer 4

A type of press with an open frame and very wide bed. Press brakes are often used for bending operations, and they are typically manually operated

Question 5

Springback

Answer 5

A material’s tendency to return to its original state once its state of motion has been disturbed. Springback is often corrected on bending operations with overbending.

Question 6

Stress Fracture

Answer 6

Hair-like cracks that appear on the surface of the workpiece if the tensile strength of the material has been exceeded.

Question 7

Tensile Strength

Answer 7

The ability of a metal to resist forces that attempt to pull apart or stretch it. Workpieces formed on the press brake must not exceed their tensile strength or they will crack.

Question 8

Tonnage

Answer 8

A measurement of a press brake’s ability to exert pressure. Press brakes are rated by the amount of tonnage they exert.

Question 9

Yield Point

Answer 9

The point at which a material is permanently deformed. Workpieces formed on the press brake must reach their yield point in order to maintain the desired shape.

Question 10

Yield Strength

Answer 10

The amount of tension a material can withstand before it is permanently deformed. Workpieces formed on a press brake must exceed their yield strength, but not tensile strength.