What are the manufacturing processes of stainless steel thermos cups?

What are the manufacturing processes of stainless steel thermos cups?
Stainless steel thermos cups are popular for their excellent insulation performance and durability. Its manufacturing process is a complex process involving multiple steps and sophisticated technology. The following are the key steps in the manufacturing process of stainless steel thermos cups:

1. Material preparation
First, select high-quality stainless steel plates as raw materials. Commonly used materials are 304 and 316 stainless steel. Among them, 316 stainless steel has improved corrosion resistance and strength at high temperatures due to the addition of Mo elements

2. Stamping
The stainless steel plate is formed by stamping mechanical equipment. According to the design requirements, the stainless steel plate is stamped into the shape of the cup body, and the position of the opening and interface is reserved in advance

3. Welding process
The stainless steel cup body after stamping needs to be cleaned and polished to ensure that the surface is smooth and burr-free. Then use the TIG (argon arc welding) welding process to weld the opening part of the cup body to the interface part to seal it

4. Hardening treatment
After welding, the stainless steel cup body is hardened. This step usually uses the annealing process, that is, the cup body is placed in a high-temperature furnace and heated to a certain temperature, and then slowly cooled to improve the hardness and strength of the stainless steel material

5. Surface treatment
The surface of the hardened stainless steel cup body will become hard, and further treatment is required to make it have a better touch and appearance. Common surface treatment methods include grinding, polishing, electroplating, etc.

6. Assembly and quality inspection
Assemble the surface-treated cup body with accessories such as lids and stoppers. Then a strict quality inspection is carried out, including testing of sealing, thermal insulation, etc.

7. Shell processing flow
Including outer tube material collection, tube cutting, water expansion, segmentation, expansion, rolling middle angle, shrinking bottom, cutting bottom, punching ribs, flat top mouth, punching bottom, flat bottom mouth, cleaning and drying, inspection and knocking pits, etc.

8. Inner shell processing flow
Including inner tube material collection, tube cutting, flat tube, expansion, rolling upper angle, flat top mouth, flat bottom mouth, rolling thread, cleaning and drying, inspection and knocking pits, butt welding, water test and leak detection, drying, etc.

9. Outer and inner shell assembly process
Involving cup mouth processing, welding, pressing middle bottom, welding bottom, checking welding and bottom welding, spot welding middle bottom getter, vacuuming, temperature measurement, electrolysis, polishing, inspection and polishing, pressing large bottom, painting, spot temperature detection, inspection and painting, silk screen printing, packaging, finished product storage, etc.

These steps together ensure the quality and performance of stainless steel thermos cups, making them an indispensable practical item in daily life. With the continuous advancement of technology, these processes are also being optimized to improve production efficiency and product quality.

The insulation effect of a stainless steel thermos cup mainly depends on which process step?

The insulation effect of stainless steel thermos cups mainly depends on the following process steps:

Vacuuming process:
Vacuuming technology is one of the most important factors affecting the insulation effect. The insulation layer of the thermos cup is actually a hollow layer. The closer this hollow layer is to vacuum, the better the insulation effect. If the vacuuming technology is backward and there is residual gas, the cup body will heat up after hot water is filled, which greatly affects the insulation effect

Welding process:
There are two butt joint longitudinal seams and three end joint ring seams on the inner liner and outer shell of the stainless steel thermos cup that need to be welded, which are often welded by micro-beam plasma arc welding. Eliminating or reducing the gaps at both ends of the butt joint longitudinal welds, eliminating defects such as welding penetration and unfused, and strictly controlling the clamping quality are key factors to ensure the welding yield rate of stainless steel thermos cups, and also directly affect the insulation effect

Material selection:
The material of the thermos cup will also affect the insulation effect. High-quality stainless steel materials, such as 304 or 316 stainless steel, have good corrosion resistance and high temperature performance, and are suitable as materials for thermos cups. The vacuum layer is usually made of double-layer stainless steel, and the vacuum isolation in the middle can better isolate the external temperature and achieve the effect of heat preservation.

Sealing performance:
The sealing performance of the stainless steel thermos directly affects its heat preservation effect. Good sealing performance can prevent heat loss and external temperature intrusion, and further extend the heat preservation time of the liquid.

Cup lid design:
The sealing ring of the cup lid also affects the heat preservation effect. Under normal circumstances, the thermos cup will never leak, because leakage will inevitably lead to a significant decrease in the heat preservation effect. If there is a leak, please check and adjust the sealing ring.

Surface treatment:
The surface treatment of the thermos cup will also affect its heat preservation effect. Surface treatment includes polishing, spraying, electroplating, etc. These treatments can improve the smoothness of the cup wall, reduce heat transfer, and thus improve the insulation effect

The structure of the thermos cup:
The common structures of thermos cups are straight cups and bullet-shaped cups. Since the bullet-shaped cup uses an inner plug cup cover, the bullet-shaped thermos cup has a longer insulation effect than the straight cup with the same material

These process steps jointly determine the insulation effect of the stainless steel thermos cup. Any deficiency in any link may affect the final insulation performance.