Sheet Metal Bending Machine for sale

Sheet metal bending Machine for sale

What is Sheet metal bending? Bending is an important process in sheet metal fabrication. Sheet metal bending is used for bending steel plates to form shapes. The metal sheet bender machine is used in metal fabrication such as construction, automotive, and aluminum manufacturing, and for creating components like brackets, enclosures, and more.

Working Principle:  The sheet metal bending machine uses a punch and die to bend the metal sheet into various shapes at a fixed angle. It can use a flat square sheet to curve a sheet with the desired angle. This bending operation is subjected to the bending force.

 

Sheet Metal Bending Machines Types

The Sheet metal bending machines include hydraulic sheet metal bending machines and CNC sheet metal bending machines.

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Hydraulic Sheet Metal Bending Machine

The machine is equipped with hydraulic electric control. It can adjust slider travels, inching, semi-automatic, and automatic operating.

The hydraulic system may experience and quick decline, working speed, quick return, and sudden stop during work in the process of up and down, etc.

 

CNC sheet metal bending machine

Automatic sheet metal bending machine with CNC controller DA66 for high precision & accuracy. and The automatic bending machine for sheet metal plates can be equipped with the crowning system.

• An automatic CNC crowning system for improving the sheet metal machines’ working precision.
• a servo-driven back gauge system for increased speed.
• a 3D graphical touch screen to simulate the bending sequence.

Automation & Software

 

Automatic sheet metal bending machine with CNC-controlled back gauge

A back gauge is a component used with a sheet metal CNC bending machine to position workpieces for bending. It can be moved and positioned to allow press brakes to create a variety of complex bends.

• Ram stroke (Y) and back gauge(X, R, Z) are controlled by the CNC system.
• X controls the back gauge to move front and back.
• R controls the back gauge to move up and down.
• Z refers to back gauge fingers moving left and right.

 

Inclusion: Sheet metal CNC bending machine advantage

CNC sheet metal bending machines differ from the press brake machine in principle and assure bending accuracy and sheet protection:

1. Save Labour, an easy-to-operate CNC panel with less labor.
2. Automated precision with high bending techniques for bending profiles with accuracy.
3. High speed, improved machine processing efficiency, and low energy consumption.
4. Safety operation: Safety camera systems not only provide operational safeguards but also ensure the correct tooling is being used.

 

Sheet metal bending methods and techniques

Sheet metal Bending involves the deformation of a metal part. The deformation changes in shape from a smooth plate to a V shape. The sheet metal bending processes consist of sheet metal bending types in different shapes, applications, and advantages.

 

Air Bending:

Air bending is the most common and versatile method of bending sheet metal on a press brake. Instead of forcing the metal fully into the die cavity, the metal is formed by pressing a punch tip into the die opening, allowing the material to flex and form the desired angle. This method is called “air bending” because there is always a gap (or “air”) between the bottom of the punch tip and the bottom of the V-die cavity. Air bending is the preferred method in modern fabrication due to its flexibility and efficiency.

Bottom Bending:

Sheet metal to the bottom of the die can create a sharp bend.  As it overcomes the spring back problem by punch and die force, it provides precise bends in sheet metal work.

Bottom bending is used to produce electrical enclosures, medical equipment, and intricate components.

 

Coining:

Provides highly accurate, tightly controlled bends, suitable for intricate designs.

 

Complex forming complex parts with hemming and flattening dies

Hemming dies: Hemming dies are specialized press brake tools used to flatten a pre-bent acute angle (typically 30 or less) to create a closed, smooth, and safe 180 edge, known as a hem.

 

Roll Bending:

Roll bending uses a roller to curve the metal sheet for curved or cylindrical shapes. It is used in the production of pipes, tubes, and structural components.

Roller sets are central in the use of this method capable of creating different cross-section profiles with numerous curves. Roll bending offers high efficiency and accuracy for consistent bends.

Box Bending:

The V bends are often used in the punch and die with a V opening. It controls bending angles and is applied in the automotive, aerospace, and electronics industries.

 

 

How to calculate the Bend Allowance and Bend Deduction

You can calculate the Bend Allowance (BA) and Bend Deduction (BD) using formulas that incorporate the K-Factor, material thickness, and the bend radius. These calculations are mainly for determining the precise flat length of sheet metal needed to achieve a finished part with correct dimensions.

1. Calculating Bend Allowance (BA)

The sheet metal bending machine Bend Allowance (BA) is the length of material consumed by the bend itself, measured along the neutral axis (the internal line that neither stretches nor compresses). This length is added to the flat lengths of the two legs.

The standard formula for Bend Allowance is:

BA=2π(R+K⋅T)(A/360A)

2. Calculating Bend Deduction (BD)

The Bend Deduction (BD) is the amount that must be subtracted from the sum of the outer flange lengths (or setbacks) to get the correct flat pattern length. This is often the preferred value for CAD and CAM software.

BD=(2⋅OL)−BA

 

3. Understanding the K-Factor

The K-Factor ($K$) is a ratio used to determine the location of the neutral axis—the point within the material thickness that neither stretches nor compresses during bending. Its role is critical because it directly influences the BA and BD calculations.

• K=Distance from Inside Face to Neutral Axis / Material Thickness (T)
• ​The K-Factor is typically between 0.3 and 0.5.
• A common industry standard for air bending when the inside radius (R) is close to the material thickness (T) is K=0.44.

Why it matters:

The true K-Factor is affected by the material’s hardness, the bending method (air bending vs. bottoming), and the ratio of R to T. Using the wrong K-Factor is the single largest source of error in sheet metal layout.

 

 

Benefits of sheet metal bending

• Increased Accuracy: Given the precise determination of the k-factors and bend allowance.
• Increased Productivity: The bending processes require less tooling and can support automation.
• Less Secondary Procedures: The bending process does not require secondary processes for completion such as cutting.
• Low Tooling Cost: Employ simple tooling to undertake the bending processes resulting in an overall low cost.
• Reduce Parts Usage: Bending allows you to furnish a single piece into a desired shape without having to employ many pieces in an assembly.