The Art and Science of CNC accurate cnc machine Mandel)

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CNC machining, short for Computer Numerical Control machining, is a revolutionary manufacturing process that has transformed the way metal products are produced. This article delves into the bending of metal in relation to CNC machining, exploring its applications, techniques, and advantages.

The Bending Process in CNC Machining:

Metal bending refers to the shaping of metal sheets or components by applying force to deform them along a straight axis. In the realm of CNC machining, bending encompasses various techniques such as V-bending, air bending, coining, and rotary-draw bending. Each technique involves different tools, dies, and machinery configurations, but all of them rely on precise measurements and computerized control.

V-Bending Technique:

One common method used in CNC machining for bending sheet metal is the V-bending technique. This technique involves using a V-shaped punch and die set to form a bend angle. The sheet metal is placed between the punch and die sets, and the press applies pressure to perform the desired bending action. By adjusting the position and depth of the punch and die, different angles and bends can be achieved.

Air Bending Technique:

Another commonly utilized technique is air bending, which relies solely on the force of compressed air to mold the metal sheet. Unlike V-bending, air bending does not require a specific punch and die configuration. Instead, it depends on calculated force values to achieve the desired bend angle. As a result, this method offers more flexibility when fabricating complex shapes, albeit with less precision than V-bending.

Coining Technique:

Coining is a meticulous and highly accurate CNC bending technique primarily used for creating sharp bends. It requires applying intense localized pressure to permanently stretch and compress the material. This process produces crisp angles while maintaining overall dimensional accuracy. Coining is commonly preferred for applications where precision and tight tolerances are critical.

Rotary-Draw Bending Technique:

The rotary-draw bending technique is utilized for hollow or tubular metal components. It involves clamping one end of the tube and then drawing it around a die by rotating it using rollers. The degree of bend is determined by the size and shape of the die, allowing for precise control over the final product's curvature.

Advantages of CNC Machining in Metal Bending:

1. Precision and Repeatability: CNC machining ensures highly accurate bends with minimal variation across multiple batches, resulting in consistent part quality.

2. Faster Production Time: Computer-controlled machines are capable of quickly executing complex bending operations, reducing overall production time significantly.

3. Cost-effectiveness: By automating processes, CNC machining minimizes labor costs associated with manual bending, making it an economically viable option for large-scale production runs.

4. Versatility: CNC machining can handle various metals such as steel, aluminum, stainless steel, and copper alloys, accommodating diverse manufacturing needs.


CNC machining has revolutionized the metal fabrication industry, specifically regarding metal bending techniques. From V-bending to air bending, coining, and rotary-draw bending, these advanced processes leverage computer-controlled precision to create intricate shapes and angles consistently. Embracing CNC machining opens doors to increased productivity, cost efficiency, and enhanced versatility, meeting modern demands in industries ranging from automotive to architecture and beyond. CNC Milling