Assembly of thermos cup: fine craftsmanship from parts to finished products

Assembly of Thermos cup: fine craftsmanship from parts to finished products

Introduction
As an indispensable drinking utensil in modern life, the insulation performance and service life of the thermos cup directly depend on the fine assembly process in the production process.

I. Raw material preparation
(I) Stainless steel sheet
The main raw material of the thermos cup is stainless steel sheet, usually 304 or 316 stainless steel, which has good corrosion resistance and thermal insulation performance. When purchasing raw materials, it is necessary to conduct strict quality inspection on the stainless steel sheet to ensure that it meets the production requirements.
(II) Plastic parts
Plastic parts such as cup lids and sealing rings are usually made of food-grade plastic to ensure safety and non-toxicity. These plastic parts need to undergo precise mold manufacturing and injection molding to ensure their dimensional accuracy and function.

II. Shell processing process
(I) Tube cutting
Use a lathe to cut the stainless steel sheet into the required tubular shell, requiring accurate size to avoid pits, concave spots or pitting.
(II) Bulging
The cut shell is bulged by a water expansion press or a large press to achieve the designed shape and size. During the bulging process, the pressure and time need to be strictly controlled to ensure the uniformity and strength of the shell.
(III) Bottom reduction and bottom cutting
Use a lathe to shrink the bottom of the bulged shell to the designed size, and then accurately cut the bottom to ensure that the cut is uniform, without gaps and burrs.
(IV) Rib punching and flattening
Flatten the welding seam at the shell mouth on a small press to make the weld smooth and uniform to avoid welding jumps during welding. Then use a lathe to flatten the upper and flat bottom of the shell to ensure accurate dimensions.
(V) Cleaning and drying
Deeply clean the processed shell to remove oil and impurities on the surface, and then dry it at high temperature to ensure that the surface of the shell is clean.
(VI) Inspection and knocking
Strictly inspect the shell after cleaning and drying to check for defects such as pits and concave spots. If there are defects, knocking and flattening is required until it meets the quality requirements.

III. Liner processing process
(I) Cutting and flattening
Cut the stainless steel sheet into the tube shape required for the liner, and then use a lathe to flatten the tube mouth.
(ii) Bulging and rolling up angles
Bulge the liner to achieve the designed shape and size. Then use a lathe to roll the upper corner of the liner to meet the size requirements.
(iii) Flat mouth and thread rolling
Use a lathe to make the upper and lower mouths of the liner flat, and then use a special thread machine to roll the threads to ensure that the depth of the threads meets the design requirements.
(iv) Cleaning and drying
Deeply clean and high-temperature dry the liner to ensure that the surface of the liner is clean.
(v) Butt welding and leak detection
Butt weld the liner and the inner bottom, requiring the weld to be smooth, without holes or pits. After welding, perform water testing and leak detection to ensure the sealing of the liner.

IV. Assembly and surface treatment process
(i) Matching the cup mouth and welding
Precisely match the liner and the outer shell to ensure that the cup mouth is flat. Then perform the welding mouth and bottom welding operations to ensure that the bottom of the weld is welded through and smooth, without bumps, weld nodules, and leaking welds.
(ii) Vacuum treatment
Spot weld the getter inside the midsole, then press the welded cup onto the midsole to make it level with the bottom. Use tailless vacuum technology to extract the vacuum to ensure the insulation effect.
(iii) Electrolysis and polishing
The vacuumed cup is sent to an outsourcing company for electrolysis treatment. The electrolysis inside the cup is required to be bright and uniform, without watermarks or yellow spots. Then polishing is performed. The outer shell of the cup is required to be polished finely and with orderly patterns, and the mouth of the cup is smooth and bright.
(iv) Painting and silk screen printing
The polished cup is painted. The paint is required to be even and firm, without paint falling off or pitting. After the painting is completed, silk screen printing is performed. The trademark LOGO is printed as required to ensure that the pattern is clear and the position is accurate.
(v) Packaging and warehousing
The finished thermos cup is packaged to ensure that the packaging is firm and easy to transport and sell. After the packaging is completed, quality sampling is carried out to ensure that each batch of products meets the quality standards. Finally, the finished product is put into storage and waits for shipment.

V. Quality Control
(I) Raw Material Inspection
When purchasing raw materials, stainless steel plates and plastic parts are strictly inspected to ensure that they meet production requirements.
(II) Quality Inspection during Production
In each processing link, the product is strictly inspected for quality to detect and deal with problems in a timely manner. For example, during the welding process, the welds are strictly inspected to ensure that there are no holes or pits.
(III) Finished Product Inspection
The finished thermos cup is fully inspected for quality, including indicators such as appearance, sealing, and thermal insulation performance. Through strict quality control, ensure that each product meets high quality standards.

VI. Conclusion
The assembly of the thermos cup is a complex and delicate process involving multiple links and strict quality control. From raw material preparation to shell processing, liner processing, final assembly and surface treatment, each step requires precise operation and strict inspection.