Technical Product Introduction
At Dongmo Precision, we specialize in the engineering and manufacturing of high-performance fire extinguisher moulds. Producing a fire extinguisher body requires extreme precision in the deep drawing process to ensure uniform wall thickness and structural integrity, as these vessels must withstand significant internal pressure.
Our tooling solutions cover the entire production line for dry powder, CO2, and water-based fire extinguishers. We utilize high-strength alloy steels and advanced surface treatments to ensure that our stamping dies deliver consistent results over millions of cycles, meeting international safety standards such as CE, UL, and EN3.
| Feature | Professional Specification |
| Product Range | 1kg, 2kg, 6kg, 9kg, 12kg Fire Extinguisher Bodies |
| Process Type | Multi-Stage Deep Drawing, Trimming, Necking |
| Mould Material | Cr12MoV, DC53, or SKD11 (HRC 60-62) |
| Surface Treatment | TD Coating (Thermal Diffusion) / Hard Chrome Plating |
| Drawing Ratio | Optimized for minimized thinning (Thinning Rate < 15%) |
| Die Life | 500,000 to 1,200,000 Strokes |
| Tolerance | ±0.05mm on Cylinder Diameter and Wall Thickness |
Distinguishable Advantages
Uniform Wall Thickness Control: The most critical challenge in fire extinguisher mould design is preventing excessive thinning at the bottom corners. We use CAE AutoForm simulation to optimize the draw bead geometry and blank holder pressure, ensuring consistent strength across the entire cylinder body.
Anti-Galling TD Technology: For stainless steel or high-tensile steel extinguishers, we apply TD (Thermal Diffusion) coating to our drawing dies. This creates a surface hardness of HV 3000, preventing the "scuffing" or "galling" that often ruins the surface finish of the cylinders.
Integrated Necking & Threading: Our tooling set includes specialized necking dies that transition the drawn body into a precision-threaded neck, ensuring a perfect seal for the valve assembly.
High-Speed Production Readiness: All our moulds are designed with modular components, allowing for quick maintenance and minimal downtime on your hydraulic press or automatic stamping line.
Manufacturing Process Stages
Circular Blanking: Cutting the initial steel disc from the coil.
First Draw (Cupping): The initial formation of the cylinder shape.
Redrawing Stages: Gradually reaching the final height and diameter while maintaining structural integrity.
Trimming & Joggling: Cutting the top edge and preparing it for welding (for two-piece designs).
Necking & Piercing: Forming the top opening for the valve boss.
Professional FAQ
Q: Can your moulds handle different grades of steel, such as HP295 or Stainless Steel? A: Yes. We adjust the mould clearance and radii specifically based on the yield strength and elongation of your material to prevent fracturing or springback issues.
Q: How do you ensure the mould survives high-volume production? A: We use a combination of vacuum heat treatment and cryogenic stress-relieving. This makes the fire extinguisher mould resistant to both abrasive wear and mechanical fatigue over long-term use.
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