Crafting Stainless Steel Sinks: A Detailed Process

Introduction

Stainless steel sinks, essential components in modern kitchens for washing vegetables or dishes, have a rich history. Originating in Europe and the United States, they made their way to China, with Taiwanese merchants playing a pivotal role. Brands like "Mantangchun" and "Molin" marked the early days. Let's delve into the intricate process of creating stainless steel sinks.

Equipment Required

1. Hydraulic Drawing Presses:

• 2 sets (400T and 500T)
• 1 set of hydraulic press (200T)
• 1 set of power press

2. Molds:

• 4 sets (drawing, forming, trimming, punching)

  
  

Production Process

1. Purchasing of Raw Material

• Sink factories procure steel plates of varying widths and thicknesses.
• Common sheet metal thickness: 0.8mm to 1.5mm.
• Sheets are delivered in coils, with a maximum width of 1220mm.

2. Laminating

• Apply a laminating film to prevent cracking during drawing.
• Coating covers one side of the steel sheet.

3. Sheet Metal Cutting

• Long steel sheets are cut into segments based on sink design.
• Workers control the roller switch for film coating during cutting.

4. Corner Notching

• Feed the sheet into a shearing machine for corner notching.
• Sheets become polygonal with arc edges.

5. Oiling

• Apply drawing oil evenly to both sides of the sheet after coating.
• Enhances even stress, reduces cracking risk, and prolongs mold and press machine life.

6. First-time Drawing

• Place the metal sheet on the drawing press machine.
• 400T machine for drawing, 500T for forming.
• Achieve 80% or more of the total design depth in the first drawing.

7. Cleaning

• Clean the workbench and remove the film from the initially formed basin.

8. Annealing

• Required for depths between 180mm to 250mm.
• Annealing restores stainless steel sheet activity strained during drawing.
• Annealing line operates at approximately 1150℃.

9. Second-time Drawing

• Conduct a second drawing to achieve the designed depth.

10. Trimming

• Remove excess trim from the finished product.
• Reserve installation positions for stiffener ribs.

11. Hole Punching

• Punch drainage and overflow holes on a special mold.

12. Welding

• Twin-tank roll welding or butt welding as needed.
• Butt welding creates a weld line between basin sides.

13. Spot Welding

• Ribs/hooks are laser spot welded or bonded with glue.

14. Surface Treatment

• Common treatments: sanding, sandblasting, polishing, embossing.
• Sanding involves multiple steps for bottom and wall polishing.

15. Hole Opening

• Excavate faucet holes according to order requirements.

16. Marking

• Laser or embossing marks are applied.

17. Restoration

• Minor damages are repaired before spraying.

18. Spray Coating

• Bottom spray treatment to add weight, cover annealing traces, and prevent condensation.

19. Cleaning & Packing

• Remove residual oil, dirt, and spray.
• Pack sinks based on customer requirements.

20. Stocking

• Finished products are stocked in the warehouse for delivery.

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Conclusion

The meticulous process of crafting stainless steel sinks involves precision at every step, from material selection to the final product. Manufacturers navigate a series of treatments, drawings, and weldings to deliver sinks that meet both functional and aesthetic standards.

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