Technical Definition and Core Advantages
Sheet metal stamping bending is a cold forming process that uses a CNC punching machine (nominal force 25-300T) and a bending machine (accuracy ± 0.05mm) to process metal sheets (thickness 0.5-12mm) into three-dimensional structural parts. Compared to traditional welding techniques, it has Efficiency advantage: Single piece processing cycle<30 seconds (continuous mold production speed can reach 1200 times/hour) Accuracy control: bending angle tolerance ± 0.5 °, positioning accuracy 0.02mm (laser detection compensation) Cost effectiveness: Material utilization rate ≥ 92% (optimized by nested typesetting software) Strength retention: The fiber streamline is continuous, and the fatigue resistance is three times higher than that of welded parts.
Sheet Metal Bending Parts Are Widely Used In The Following Products
1. The casing and bracket of electronic and electrical equipment. Mainly computer cases and server cabinets, which can provide electromagnetic shielding and structural support. The printer/scanner casing and mobile phone metal frame function are both lightweight and protective. There are also power brackets and heat sink shells for some internal components, which are formed by bending to create ventilation structures.
2. In the automotive industry, such as exterior body parts, doors, engine hood, and insurance cover, high-precision curved bending can meet aerodynamic requirements. In addition, structural components such as control arms are required to withstand dynamic loads. For structural functional components such as battery pack casings and lightweight requirements for new energy vehicles, aluminum alloy bending is mainly used.
3. Mechanical casings and frames in industrial equipment, machine tool protective covers, and automation equipment racks, as they have load-bearing structures with a thickness greater than 3mm. Distribution box/switch gear (meeting IP protection level and electrical insulation requirements). There are also ventilation ducts, elbows/tees (bent to achieve airtight connections).
4. In terms of architecture and public facilities, the curtain wall support frames and steel structure connectors in building components are mainly strengthened by bending hot-rolled sheet metal to enhance their load-bearing capacity. Fire ventilation ducts are mainly made of stainless steel sheet metal bent for corrosion and rust prevention. In terms of public facilities, there are metal seat frames and public information brackets, as sheet metal products have strong heat resistance for outdoor use.
5. In the medical and specialty fields, we use 304 stainless steel bending to meet sterilization requirements for medical equipment such as testing instrument casings and surgical equipment brackets.
Classification and Technical Characteristics of Main Surface Treatment Processes for Sheet Metal Stamping and Bending Parts
1. The most common process is galvanizing, which can be divided into the following categories for rust prevention and corrosion resistance:
Electro galvanizing: forming a 5-15 μ m zinc layer, resistant to neutral environmental corrosion such as indoor electrical enclosures made by sheet metal bending
Hot dip galvanizing: Zinc layer>20 μ m, salt spray resistance>500h. Commonly used for outdoor structural components
Electrophoretic coating: The cathodic electro phoretic paint film is uniform (thickness 18-25 μ m) and has passed a 300h salt spray test. It is commonly used for automotive chassis components.
Anodizing: A dense Al ₂ O3 film (hardness HV400+) is formed on the surface of aluminum parts, which increases corrosion resistance by three times and is commonly used in electronic product casings.
Passivation treatment: Stainless steel acid bath removes free carbon molecules, enhances the anti rust ability of passivation film, commonly used in medical devices.
2. Decorative surface treatment is mainly for appearance and texture.
Powder coating treatment: Polyester/epoxy powder, 60-120 μ m thickness, RAL color card customization commonly used in home appliance panels and exterior surfaces.
Advantages: Wear resistance>5000 times steel wool friction, cost 30% lower than liquid paint.
Baking process: Three layer spraying (primer+color paint+varnish), mirror glossiness>90GU, used for high-end display racks.
Wire drawing treatment: Mechanical grinding forms straight/irregular lines, Ra 0.4-1.6μm, Commonly seen in electronic product frames.
Electroplating decorative layer: divided into chrome plating and nickel plating. Chrome plating is used for faucets and car sign sheet metal parts, with a mirror effect. Nickel plating is used on some sheet metal parts in the kitchen and bathroom to prevent fingerprints.
3. Functional surface treatment, such as sandblasting, commonly used for welding parts, as well as conductive oxidation.
Sheet metal stamping bending parts have become an indispensable core component in modern industrial manufacturing due to their high precision, high strength, and flexible design adaptability. Whether it is precision structural components of electronic devices or load-bearing parts of heavy machinery, our sheet metal bending parts can ensure dimensional stability and batch consistency through advanced CNC bending technology (accuracy ± 0.1mm) and strict ISO 9001 quality management system. At the same time, we provide a full process solution from material selection (stainless steel/aluminum alloy/galvanized sheet), surface treatment (spraying/electroplating/anodizing) to assembly integration, meeting customers' diversified needs for cost control, light weighting, and corrosion resistance. By choosing our sheet metal bending service, you will receive industrial grade products that combine engineering aesthetics and functional reliability, providing a solid guarantee for improving the performance of your equipment.
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