In-Depth Comparative Analysis of Two Manufacturing Processes for the Same Stainless Steel Vacuum Flask (Deep-Drawing Chapter)

"Every cup tells a story, every life carries warmth." Hello everyone, welcome back to "Dong Dong's Cup Talk" At recent trade shows, many visitors consistently asked about the differences between tube-drawing and deep-drawing processes for manufacturing identical vacuum flasks. http://www.umbottle.com/ProductsDetail-VB-10495.htmlToday, we'll focus on analyzing the multi-stage deep-drawing process in detail. Given the technical depth, we'll present this information in multiple installments.

For concrete understanding, we'll examine a standard cylindrical stainless steel vacuum flask (350ml capacity, 70mm diameter, 180mm height) as our case study. This second installment will comprehensively analyze the traditional multi-stage deep-drawing process, including practical production challenges and solutions. http://www.umbottle.com/ProductsDetail-VB-10495.htmlThese views represent my professional perspective - please feel free to provide feedback via private message or comments.

Part Two: Comprehensive Analysis of Multi-Stage Deep-Drawing Process

Production Workflow:

1. Coil blanking → 2. First drawing → 3. Intermediate annealing → 4. Second drawing → 5. Third drawing → 6. Bulging and shaping → 7. Edge trimming → 8. http://www.umbottle.com/ProductsDetail-VB-10495.htmlVacuum sealing welding → 9. Electrolytic polishing

Key Process Challenges & Manual Intervention Points:

1. Secondary Defects in Multi-Stage Drawing

- Material limitation: Requires 0.5-0.8mm thickness of soft stainless steel

- Thicker materials (>1.0mm) require 6-8 drawing stages, http://www.umbottle.com/ProductsDetail-VB-10495.htmlcreating visible annular marks (e.g., a 2022 viral cup developed 0.1mm-deep marks after 5 stages, necessitating 2 additional interior polishing steps)

2. Precision Control in Annealing

- Standard procedure: 3-minute annealing at 1050°C after each drawing stage

- Operators must monitor with infrared thermometers - http://www.umbottle.com/ProductsDetail-VB-10495.htmltemperature deviations beyond ±15°C cause excessive grain growth (>Grade 6)

3. Manual Finishing Requirements

- Case study (2020): 0.05mm mold clearance variance caused 30% of products to develop 0.2mm burrs at the rim

- Solution: Dedicated workers manually polished with 400-grit sanding belts, http://www.umbottle.com/ProductsDetail-VB-10495.htmladding 12 seconds per unit

Material Thickness Impact on Cost:

The impact of material thickness on cost:

Thickness 0.6mm, stretching times 3-4 times, pass rate 92%, single piece working time 95 seconds

Thickness 0.8mm, stretching times 4-6 times, http://www.umbottle.com/ProductsDetail-VB-10495.htmlpass rate 87%, single piece working time 110 seconds

Thickness 1.0mm, stretching times 5-7 times, pass rate 78%, single piece working time 135 seconds

This analysis reveals how material specifications directly influence production efficiency and quality outcomes in deep-drawing processes. http://www.umbottle.com/ProductsDetail-VB-10495.htmlThe next installment will examine the tube-drawing alternative for comparison.