Sheet metal processing technology material cutting
In the entire Precision Sheet Metal processing chain, blanking is the "opening process" that determines the precision of the finished product—it is like the "shaping starting point" of the metal sheet, anchoring the feasibility of subsequent bending and welding from the root, and directly affecting the assembly precision and service life of the mechanical equipment shell. From small parts a few millimeters in size to cabinet panels several meters long, the precision of every cut and punching is a direct reflection of the "millimeter-level rigor" of industrial manufacturing.
Shearing is used to cut out the external dimensions of parts, and punching and cutting corners are performed when necessary in conjunction with punching machines and dies.
This process involves punching a flat sheet metal structure into shape using a punch press, which unfolds the part into its final form in one or more steps. It has the advantages of being short in time and highly efficient.
NC (Computer Numerical Control) Blanking
Using programming software to write CNC programs, the flat plate structure on the iron plate is gradually cut by a CNC machine tool. It was stamped out.
Cutting flat parts into structural shapes from iron plates using laser cutting methods. Laser cutting is currently the core choice for high-precision material preparation. Utilizing a fiber laser generator, the beam focusing diameter can be reduced to 0.1mm, enabling "non-contact processing" on various sheet materials such as stainless steel and aluminum alloys.
This avoids dimensional deviations caused by traditional tool wear and controls cutting tolerances within ±0.05mm. For complex irregularly shaped parts, the cutting path is automatically generated by importing drawings. Combined with dynamic focusing technology, even sharp corners with a radius of less than 5° can achieve a smooth transition without subsequent grinding or correction.
CNC punching demonstrates its advantages in batch standardized blanking. Utilizing a multi-station turret punch press, over 20 types of dies can be simultaneously mounted, completing composite processes such as punching, trimming, and flanging in one go, increasing the processing efficiency of a single sheet of material by more than three times compared to traditional methods. To prevent deformation during punching of thin sheets (≤1mm), the punching clearance is optimized (typically set at 10%-15% of the sheet thickness) and a flexible unloading device is used to ensure that the punched edges are burr-free and warped, directly meeting subsequent assembly requirements.
The advancement of material cutting processes lies in "pre-planning." For example, for high-strength steel plates, laser cutting power and feed speed parameters can be preset; for easily oxidized aluminum alloys, passivation treatment can be performed immediately after cutting. The precision of this "first cut," seemingly a collision between metal and cutting tool, is actually a deep coupling of manufacturing logic and material properties—it allows each piece of sheet metal to accurately "go" to the next process, becoming an invisible cornerstone for the reliable operation of industrial equipment.