Hydraulic Press Brake

Press Brake

NC Press Brake

If you have limit budget, the NC press brake will be a good choice for you to finish sheet metal bending.

Press Brake

CNC Press Brake

CNC press brake has much higher accuracy, efficiency than NC press brake when bending metal plate.

Robotic Press Brake

Robotic Press Brake

Robotic press brake It can efficiently and accurately complete the automatic bending of sheet metal.

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Sheet Metal Z-bending and N-bending (Precautions)

Definition: zigzag bending is called Z bending.

Standard bending process range: height of Z bending > apothem of V groove + Thickness

The minimum processing size is limited by the model used while the maximum processing size is determined by the shape of the machine table.

Z bending

Z Processing Procedures

  1. Processing to form a L bending
  2. Bend the horizontal side of the L bending to form a Z bending (or bend the vertical side of the L bending to form a Z bending)

Workpiece Placement Principles for Z-bending

A: Convenient, good stability.

B: Generally is similar to L-bending.

C: The workpiece is flat with the lower die during the 2nd placement.

Matters Need Attention for Z-bending

  • The angle of L bending should be as accurate as possible, normally ranging from 89.5 °to 90 °.
  • The back gauge should be set up to prevent deformation of the workpiece.

General Processing Methods of Z bending

  • The processing sequence should be considered as shown in the following picture, first bend 1 and then bend 2.

General Processing Methods of Z bending

  • First bend to form an L bending and then further processed to form a Z bending (if interfere with machine worktable, first bend 1 to form a large angle, then bend 2 and then press 1)
  • Using two acute angles to form Z bending: first bend into a right-angle, then insert 2 and then insert 1

Using two acute angles to form Z bending

1) If there is a collision, first bend 1 to form a large angle, then bend 2 and then press 1.

2) if no collision, as per general Z bending processing method, first bend 1 and then bend 2.

Special Processing Method of Z bending

A: lower die decenter processing

B: small V groove processing

C: bending to form a large angle, then pressing

D: choose grindable lower die

Other Z Bending Methods

A: process with offset die

B: process with the transformable die

N Bending Processing

Definition: continuously process the same machining surface twice to form N bending

N Bending Processing

Precautions for N-bending Processing

  1. the angle of the first bending should be less than or equal to 90°
  2. the back gauge of second bending should be based on the machining surface

Special Processing Method of N Bending

  • if interfere with the top punch a little after Y sizes N-bending ==> flattening with hemming die after N-bending.
  • if interfere with top punch very serious after Y sizes N bending ==> bend to collision position after A bend press line, positioning C and bending B point, then use hemming die + padding to form into shape.

Special Processing Method of N Bending

  • Processing with shaping punch and die.

shaping punch and die

Arc Processing

Arc processing is divided into two kinds: circular cutting with bending model and circular cutting with arc knife.

The arc knife is divided into two types: fixed and rod.

Arc Processing


A: when machining with  90°low die, there may be inadequate machining, so it is necessary to push the mold with hand or if possible, using  88°low die.

B: detect with detecting appliance to ensure the appearance size of the workpiece.

C: when processing 90°arc, the low die should choose 2 (R+T)

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