Stamping Process Flow for Bag snap hook
A small lobster clasp may seem simple, but its production involves considerable industrial technology. In many countries, independently manufacturing these small lobster clasps is quite challenging, leading to heavy reliance on imports. Let’s examine the stamping process for Bag snap hook:
For both technical feasibility and cost efficiency, the stamping process employs a compound die solution that integrates multiple operations into a single mold. The sequence follows the traditional “from simple to complex” principle: first punching the inner hole, then forming the outer shape, and finally completing the final forming.
Pressing Process Sequence
During a single left-to-right feed cycle, the strip passes through the following stations:
- Station 1: Blank stroke
- Station 2: Embossing
- Station 3: Punching
- Station 4: Trimming
- Station 5: Punching
- Station 6: Blank stroke
- Station 7: Blank stroke
- Station 8: Punching
- Station 9: No-operation
- Station 10: Forming
- Station 11: No-operation
- Station 12: Punching
- Station 13: Notching and Downward Bending
- Station 14: Downward Bending
- Station 15: Forming
- Station 16: No-operation
- Station 17: No-operation
- Station 18: Blanking.
For the stamping process of lobster clips, factors such as material utilization rate, forming quality, and production efficiency must be considered. Based on material thickness and product structural complexity, the following sequence of operations is adopted: blanking followed by punching, then blanking out, forming, trimming, and finally finishing. During stamping, calculating the blanking clearance is critical and can be determined using the following formula.
Where:
Cutting clearance Z (mm)
Coefficient k (0.005–0.035)
Material thickness s (mm)
Material shear strength τb (MPa)
Stainless steel is commonly used for lobster clips
with stamping parameters selected as shown in the table below
| Process | Stamping Force (kN) | Clearance Coefficient k | Die Material | Lubrication Condition |
|---|---|---|---|---|
| Blanking | 180-220 | 0.025 | Cr12MoV | Mineral Oil |
| Punching | 80-120 | 0.020 | SKD11 | Mineral Oil + Additives |
| Blank Separation | 150-190 | 0.025 | Cr12MoV | Mineral Oil |
| Sizing | 240-280 | – | SKH51 | Synthetic Lubricating Oil |
| Trimming | 60-90 | 0.015 | SKD11 | Mineral Oil |
| Finishing | 70-100 | 0.010 | SKH51 | Precision Lubricating Oil |
In summary, a seemingly simple bag lobster snap involves approximately 18 distinct stamping process steps. The intricate details demand high precision, making independent production of such bag hardware components unfeasible without substantial industrial expertise. So why does OYC offer competitive pricing for its bag lobster clips? This advantage stems entirely from China’s robust supply chain, deep industrial expertise, and economies of scale, which collectively drive down marginal costs.
