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Vacuum Brazing Furnace

Vacuum brazing furnace vacuum brazing process application and quality assurance of vacuum cups

The stainless steel heat insulation cup is made of double stainless steel inside and outside. The inner liner and the outer shell are combined by welding technology, and the air in the interlayer between the inner liner and the outer shell is extracted by vacuum technology to achieve the effect of vacuum insulation.

Stainless steel thermos cups are divided into: ordinary thermos cups (after boiling water is poured, the insulation time is generally less than three hours), vacuum thermos cups (through the vacuum process, you can keep the boiling water for more than 8 hours).

Features
In fact, the length of the vacuum insulation cup depends on the structure of the cup body and the thickness of the cup material.

Generally speaking, the thinner the cup material, the longer the holding time. But the cup body is easy to break and deform, which affects the service life; measures such as metal film and copper plating on the outer layer of the inner liner of the vacuum cup can also increase the degree of insulation; large-capacity, small-diameter vacuum cups have a longer insulation time, on the contrary, a small capacity Large-diameter vacuum insulation cups have a shorter insulation time; the service life of vacuum cups also depends on the time of cleaning and vacuuming of the inner body of the cup. The most important thing is the structure of the vacuum furnace.

Vacuum equipment for vacuuming vacuum cups used in the society includes vacuum exhaust tables and vacuum brazing furnaces. There are about two types and four types. One type has a tail vacuum exhaust table; the other type is brazing furnace type. The brazing furnace type is further divided into: single chamber, multi-chamber, multi-chamber with increased pumping speed.
Single furnace integral vacuum brazing furnace. The furnace has a long evacuation cycle time. If the manufacturer wants to improve production efficiency and shorten the evacuation time, it will affect the service life of the cup. The service life of the cup is only about 8 years. Vacuum cup exhaust table with tail and its advantages: The vacuum cup produced by the vacuum exhaust table with tail exhaust has a heating temperature of about 500°C during vacuuming. The outer shell of the vacuum cup is not easily deformed, but the copper tube welding place is easy to touch Leakage, special protection is required when processing semi-finished products.

In addition, a big category is the vacuum brazing furnace type, which is roughly divided into three types. Although the vacuum insulation cups we usually use are no different from the general insulation cups in appearance, the vacuum insulation cups are required by the general insulation cups in the production process. It is much more complicated and the technical difficulty is much higher. Therefore, vacuum insulated cups are at least twice as expensive as ordinary insulated cups.

Features
The stainless steel thermos cup has the function of heat preservation and cold preservation. The ordinary thermos cup has a relatively poor function of heat preservation and cold preservation. The effect of the vacuum thermos cup is much better. We can use the vacuum thermos cup to load ice water or ice cubes on hot days. , So that you can enjoy the icy feeling at any time, in winter can be filled with hot water, so that you can drink hot water at any time.

Since stainless steel thermos cups can be customized according to requirements, the operation is more flexible and simple. Therefore, more and more people regard stainless steel thermos cups as a gift for friends, customers, and promotions. Made on the body or on the lid Some content such as your own company information or passing blessings. This customized gift is being accepted by more and more people.

Production process
1. Shell processing flow
Outer pipe picking—cutting pipe—bulge—section—bulge—rolling angle—shrink bottom—cut bottom—ribbing—flat upper mouth—red bottom—flat bottom mouth—cleaning and drying—inspection knocking pit—qualified shell

2. Inner shell processing flow
Inner tube picking–cutting tube–flat tube–bulge-roll up angle–flat upper port–flat bottom port–roll thread–cleaning and drying–inspection knocking pit–butt welding–water test leak detection–drying–qualified liner

3. Assembly process of outer shell and inner shell
Matching cup mouth–welding mouth-pressure midsole–welding bottom-inspection welding mouth welding bottom–midsole spot welding getter– -evacuation–temperature measurement–electrolysis– polishing–temperature measurement–inspection polishing–pressure outsole — painting — Sampling test temperature — inspection spray painting — silk screen — packaging-finished products into the warehouse

The thermal insulation effect of the stainless steel insulated water cup depends on the degree of vacuum between the inner tank and the outer shell, and has little to do with what process is used;
The inner liner and outer shell of the stainless steel thermos cup must be welded, that is to say, there is at least one welding seam;

Whether it will lose the insulation effect after using for a period of time, mainly depends on the welding quality (no insulation after a leak);

Both the liner and the shell are formed at one time. The process level is high, but it is difficult to control the quality; the shell is welded easily, but the quality control requirements are relatively easy to achieve;

It is easier to clean the inner liner once formed.

The vacuuming process in the manufacturing process of the thermos is a crucial step, because the vacuum between the two layers of the body directly determines the quality of the thermos.

All along, the vacuum production process of vacuum flasks has tail and exhaust seals. But in recent years, the tailless solder brazing of the integrated vacuum brazing furnace has gradually replaced the tailed and exhaust seal brazing. The vacuum brazing has many advantages. The vacuum brazing furnace can have operational aspects, mass production, and working vacuum. High, through a specific brazing process, the quality of the weld joint is high, extending the life of the insulation cup.

SIMUWU low temperature vacuum brazing furnace, the perfect solution for vacuum cup brazing.

1. High vacuum degree: Equipped with a three-stage large pumping speed vacuum pump system, the ultimate vacuum can reach 10-4Pa, and the welding working vacuum can reach 2*10-3Pa.

2. Large size, multi-temperature heating, with good temperature uniformity, up to ±3℃.

3. Fully automatic operation procedure: adopt Siemens PLC and electric control components, set the temperature curve, the vacuum furnace can automatically go through the whole process, and the full name does not require human intervention.

4. Double-layer water-cooling design: The furnace body adopts double-layer water-cooling jacket, and the cooling water circulates inside the furnace body, taking away the heat of the surface temperature of the furnace body uninterruptedly, ensuring that the surface temperature of the furnace body is around 35C, ensuring the operator and working environment Security.

5. Vacuum glass solder, special solder for brazing of insulation cup, has good welding characteristics, to ensure the quality of insulation cup brazing.

6. Tubed getter: It is bonded between the double-layer cup walls of the insulation cup, which can effectively remove the gas overflowing in the later period of brazing and ensure the vacuum degree of the cup wall.

Vacuum brazing process of vacuum insulation cup:

Feeding-temperature rise to 300C at room temperature-heat preservation for 15-30 minutes (to allow the temperature uniformity inside the vacuum furnace to reach a good state)-continue to heat up to 500C-heat preservation-heat to above the melting point of the solder-a certain time Insulation, let the solder fully perform capillary action to solder the tail hole of the insulation cup-cool down to 200C-take the material.