Technical Introduction)
At Dongmo Precision, our LPG Cylinder Mould is engineered to master the rigorous challenges of heavy-duty deep drawing. Unlike standard stamping dies, gas cylinder production requires the tooling to manage complex material flow dynamics under high pressure to prevent necking, wrinkling, or thinning in the dome and base areas.
Our specialized die sets are designed for the high-volume manufacturing of 6kg, 12kg, and 50kg LPG tanks. We integrate advanced thermal diffusion (TD) treatments and modular insert technologies to ensure that each stroke delivers a safe, standardized, and pressure-ready cylinder shell.
Technical Specifications)
| Feature | Engineering Grade |
| Product Target | LPG, CNG, and Refrigerant Gas Cylinders |
| Material Thickness | 2.0mm to 4.5mm (High-Tensile Grades) |
| Mould Grade Steel | DC53, SKD11, or D2 (Cryogenic Stress Relief) |
| Forming Stages | Blanking → 1st Drawing → 2nd Drawing (if needed) → Trimming & Joggling |
| Critical Tolerance | ±0.05mm on Shell Circularity |
| Drawing Ratio | CAE Optimized for Minimized Thinning Rate (<15%) |
| Surface Hardness | HV 3000 (with TD Coating Technology) |
Unique Engineering Advantages
A. Material-Specific Clearance Geometry
We don't use "one-size-fits-all" clearances. Our LPG cylinder dies are custom-calibrated based on the specific yield strength of your raw material (e.g., HP295, HP345, or SG295). This prevents the "Orange Peel" effect and ensures the structural integrity required for hydraulic burst testing.
B. TD-Coated Drawing Rings (Zero-Galling)
To solve the industry-wide problem of surface scratching during deep drawing, our drawing rings undergo TD (Thermal Diffusion) coating. This creates a vanadium carbide layer that is significantly harder than standard chrome plating, allowing for dry or minimal-lube stamping without metal pickup (galling).
C. CAE-Driven Draw Bead Design
We utilize AutoForm and PAM-STAMP to simulate the drawing process before the first piece of steel is cut. By optimizing the draw bead resistance and blank holder force (BHF), we ensure perfect material distribution, eliminating the risk of cracks in the base radius.
D. Interchangeable Joggling & Trimming Inserts
Our modular design allows for the rapid replacement of trimming blades and joggling inserts. This ensures that the weld-prep area (the joint where the two halves meet) is consistently sharp and precise, which is essential for automated longitudinal and circumferential welding.
Production Logic
Precision Blanking: Cutting the disc with controlled shear-to-break ratios.
Initial Deep Drawing: Transforming the disc into a high-aspect-ratio cup.
Intermediate Calibration: (Optional) Ensuring verticality for deep-bottles.
Edge Trimming & Joggling: Creating the precise offset for the lap joint.
Valve Boss Piercing: High-precision hole punching for the cylinder bung.
Professional FAQ
Q: How do you prevent thinning at the bottom of the cylinder? A: We use a telescopic punch design and variable blank holder pressure to control the metal flow rate. Our CAE analysis ensures that the thinning rate at the most critical stress points remains well within ISO4706 safety limits.
Q: What is the expected maintenance cycle for the die? A: With our TD-coated components, the primary drawing surfaces typically require no polishing for the first 300,000 to 500,000 strokes, which is 5x longer than standard D2 tooling.
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