Crowdly

cutoff, drawing, trimming

blanking, deep drawing, bending

blanking, deep drawing, notching

R_m - tensile strength, MPa;

Find the force (F) needed for guillotine cutter to chop metal sheet. The thickness of material is 7 mm and tensile strength is 236 MPa. The angle between the blades of the cutter φ is 7 degrees.

where s - thickness of material, mm;

τ₁ (tau) - material's shear strength, MPa;

φ (fi) - the angle between the blades of the cutter (usually 6-8 degrees).

Provide answer in Newtons.

How does drop forging hammer efficiency factor affect energy value needed for reaching desirable deformation?

there is no connection between efficiency factor and the energy needed

the higher is efficiency factor, the more energy is needed

the higher is efficiency factor, the less energy is needed

What must be kept in mind to ensure safety during free upsetting experiments:

Hands must not be placed between the hammer and the anvil

Keep your eyes open for potential threats.

During cocking the hammer make sure that protective mechanism is activated.

When conducting experiment, safety shield should be placed in the working position

The development of barrel shape of cylindrical workpiece upon upsetting may be reduced or completely avoided by:

polishing the faces of the workpiece

lubricating surfaces of the tool

decreasing the deformation temperature

increasing the deformation speed

Initial height of the workpiece is 20 mm, final height after upsetting is 15 mm. What is the value of strain?

25%

15%

How does material yield strength influence the specific pressure during upsetting?

the higher material's yield strength is, the higher is specific pressure

specific pressure doesn't depend on the material's yield strenght

the higher material's yield strength is, the lower is specific pressure

How is the specific pressure influenced by the frictional force between the workpiece and the tool?

On increasing of the friction force the specific pressure decreases

On increasing of the friction force the specific pressure rises

Specific

pressure does not depend on

frictional force

After the upsetting process the volume of the workpiece

increases

decreases

does not change

The amount of strain during upsetting is:

relative change in the height of the workpiece

relative change in workpiece's cross-sectional area

relative change in the workpiece's volume

relative change in the dimensions of the workpiece