Crowdly

radius of the die

length of the bending line and the radius of the die

the radius of the die and the radius of the punch

In which case the springback is bigger?

When the bending angle is small

When the bending force is high

When the bending radius is large

When the Elastic modulus E is high

Which sheet forming operations were used in the manufacturing process of the product shown in the figure?

punching, deep drawing, trimming

cutoff, drawing, trimming

blanking, deep drawing, bending

blanking, deep drawing, notching

What are the main sheet forming separation processes?

beading, bending

necking, expanding

punching, flanging

cutoff, blanking

The disadvantage of sheet forming is

cold processing

narrow range of source material

complexity of dies and high cost

high qualification of workers

Which sheet forming operations were used in the manufacturing process of the product shown in the figure?

punching, drawing, rolling

blanking, bending, drawing

blanking, notching, shaving

blanking, notching, bending

What are the advantages of cold forming?

higher productivity and lower production cost

better strength and extension at break

higher precision and surface quality

no restrictions to the degree of deformation

What are the required properties for cold-processed metals?

low yield strength, homogeneous structure

low hardness, heterogeneous structure

low tensile strength, high impact strength

low Young's modulus, high melting T

where k – punch material-dependent factor

Calculate clearance between the steel punch and the die z (mm). The material thickness is 1.7 mm, tensile strength 281 MPa, and the type of punch-dependent factor k is 0.01.

s – material thickness, mm;

R_m - tensile strength, MPa;

tau 1 (τ₁) – material shear strength (τ₁=R_m x 0.8), MPa.

Provide the answer in millimeters with accuracy of three decimal places. Use "." as decimal separator.

where L - the total length sheared, mm;

Calculate the punch force F (N) required to complete blanking. Circle with diameter of 18.5 mm must be cut out of the material with 5.1 mm in thickness and 104 MPa tensile strenght.

s - thickness of material, mm;

τ₁ (tau1) - shear strength of material, MPa;

R_m - tensile strength of material, MPa.

Relative error +/- 1% allowed. Circle circumference is L=pi()*d.