Features
The sheet metal stamping process for cabinet equipment is a comprehensive cold processing technology for cabinet metal sheets (usually less than 6mm), which includes multiple key processes. The following is a detailed analysis for you:
1. Preliminary preparation
 Material selection: Commonly used cold-rolled steel plates, galvanized steel plates, etc., according to the cabinet usage scenario (such as outdoor moisture-proof galvanized plates) and strength requirements, select the appropriate plate thickness (generally 0.8-3mm).
 Drawing design: Sheet metal engineers accurately design cabinet drawings, mark dimensions, hole positions, bending angles, etc., to provide a basis for stamping and subsequent processes.
2. Core stamping process
 Punching: Use a punching die to separate the sheet, including blanking (obtaining the cabinet shape blank), punching (processing installation holes, heat dissipation holes, etc.). For example, the screw holes and heat dissipation grille holes of the cabinet are completed by using a CNC punching machine or a flexible stamping line to impact the sheet with a die, which is suitable for mass production of regular shape holes.
Bending: Fix the upper and lower molds on the bending machine workbench, use the servo motor to drive, and combine the mold shape to bend the plate into cabinet side panels, door panels and other structures. You need to be familiar with the bending properties of metal, control the bending order and compensation amount, ensure accuracy (up to ±0.1mm), and avoid cracking (crack stop grooves can be set).
Stretching/convex hull: Stretching is used to make local concave/convex structures of the cabinet (such as special-shaped mounting seats); convex hulls are used to enhance strength and assist fixation (such as screw limit convex points), and local deformation is achieved by material extension.
3. Auxiliary and post-processing processes
Pressure riveting: Use a punch press/hydraulic riveting machine to press rivet studs, nuts, etc. on the cabinet, replacing traditional welding to facilitate subsequent assembly.
Welding: For cabinet parts that need to be spliced (such as cabinet frames), two-protection welding, argon arc welding, etc. are used to achieve a firm connection. Some high-precision welding will use robots to ensure consistency.
Surface treatment:
Spray coating/spraying: Electrostatically adsorb powder coating or paint, and form a protective layer after high-temperature baking to improve rust resistance, wear resistance, and aesthetics. It is commonly used for outdoor cabinets.
Electroplating: Cold-rolled plates can be electroplated with zinc, etc. to enhance corrosion resistance and adapt to humid environments.
Others: such as phosphating film (facilitating spray coating adhesion), oxidation (commonly used for aluminum cabinets), etc.
Assembly: Assemble the stamped and processed parts (side panels, top panels, door panels, etc.) into a complete cabinet according to the drawings with screws, buckles, etc., and debug smart locks, ventilation and other functions.
4. Production methods and equipment
Ordinary punch press: Traditional method, manual feeding, requiring multiple molds and multiple equipment, low efficiency and high cost, gradually being replaced.
CNC punch press: Programming control, suitable for single/small batch production, high personnel requirements, expensive equipment cost, and average material utilization rate.
Flexible sheet metal stamping production line: With flat feeder and pneumatic combination die as the core, continuous coil feeding and multi-punch combination stamping are suitable for medium/large batch cabinets (such as network cabinets and power cabinets). The mold is flexible, the stamping features can be decomposed, the punches can be combined on demand, cost reduction and efficiency improvement (speed is several times that of CNC punching machines), and material utilization rate can be improved (10% - 20%).
5. Process advantages and difficulties
Advantages: Realize the precision of cabinet structure (high precision of size and hole position), efficient production (especially flexible line), cost control (mold reuse, excellent material utilization), ensure the strength and stability of the cabinet, and adapt to the integration of smart locks, heat dissipation and other functions.
Difficulties: High precision requirements for mold design/manufacturing (affecting stamping quality); strict control of multi-process collaboration (such as bending angle affecting assembly); stamping parameters (pressure, speed) of plates of different materials and thicknesses need to be accurately debugged, which tests process experience and technical accumulation.