Copper tube production process

What is copper pipe

The so-called copper pipe refers to a pipe made of copper that has been pressed and drawn. It is also a seamless pipe. Copper pipes are light in weight, have good thermal conductivity, are strong and corrosion-resistant, and are very popular among people. Copper tubes are the most widely used and used in the electrical and electronic industries.

Copper tubes can be divided into shaped tubes and round tubes according to their shapes. Shaped tubes can be divided into oval tubes, square tubes, rectangular tubes, triangular tubes, hexagonal tubes, drop-shaped tubes, pentagonal tubes, outer square inner round tubes, spiral tubes, inner rib tubes, outer rib tubes, plum blossom tubes, etc. . Copper pipes are divided into extruded pipes, drawn pipes, welded pipes, hoses, and semi-rigid pipes according to production methods and properties. Copper tubes can be divided into red copper tubes, brass tubes, bronze tubes, and white copper tubes according to their alloy composition. Finally, it can also be divided into condenser tubes, air conditioning tubes, heat sink tubes, waveguides, oxygen generator tubes, aerospace tubes, antenna tubes, etc. according to their uses.

Continuous casting products

Extrusion and drawing

The technical requirements for copper pipe processing are as follows:

1. The processing of pipelines shall be carried out according to the design drawings, and the shape and size shall comply with the design requirements.

2. The diameter change at the fracture should be within 2% of the standard diameter of the copper pipe, and no flash or burrs are allowed at the fracture. ​

3. The pipe fittings must be degreased, decontaminated, and free of copper shavings. The internal and external surfaces must be smooth and free of oil stains, scars, and scale. ​

4. The welding process must be filled with nitrogen for protection, and the inside should be blown clean with 2.8-3.0MPa dry compressed air after welding.

The copper pipe processing methods are as follows:

1. Precision cutting and processing of various precision small tubes.

2. Grinding and sharpening the cut end faces of various precision small tubes. ​

3. Expansion and closing of various precision small tubes. ​

4. Bending and forming processing of various precision small tubes. ​

5. Processing of side surfaces of various precision small tubes. ​

6. Welding, assembling and polishing of various precision small tubes. ​

7. Perform graded compression and expansion processing on various precision small tubes. 8. Multi-station stretch forming products for various tubular products. ​

9. For hollow products on the porous wall of pipe fittings. 

There are three methods for processing copper pipes:

1. Explanation of the extrusion process of copper tubes: The definition of the extrusion process is that the copper tube is extruded through a copper tube extruder. As a result, the density distribution of the copper pipe is more uniform, and the wall thickness is also distributed evenly, thereby achieving stronger pressure resistance.

2. Explanation of copper pipe continuous casting and rolling process: The definition of continuous casting and rolling process is continuous casting and continuous rolling. Thus, the liquid copper burned at high temperature is poured into the continuous casting machine to roll out a copper billet (called a continuous casting billet). There is no subsequent cooling, and the copper rolling process is directly maintained in the soaking furnace for a certain period of time and then directly entered into the hot continuous rolling unit. The continuous casting and rolling process can skillfully combine the two processes of casting and rolling. Compared with the previous traditional process of first casting the copper billet and then heating it in a heating furnace and then rolling it, it simplifies the process, reduces labor, and It increases the metal harvest rate, saves materials, enhances the quality of continuous casting billets, and produces energy-saving and environmentally friendly copper products, directly realizing the advantages of mechanization, programming and automation in one step.

3. Explanation of the copper pipe up-drawing method: The original feature of the up-drawing method for continuous casting of copper pipes is “oxygen-free”. That is, the oxygen content is below 10 ppm. Electrolytic copper is melted at high temperature and converted into copper liquid. During the entire process after hardening and molding, charcoal reduction, flake graphite covering, and oxygen isolation are used. Oxygen exists in the form of copper oxide and cuprous oxide in the molten copper liquid. Under the action of high temperature, charcoal can deoxidize itself, making its oxygen content less than 10ppm. Due to the oxygen barrier effect of the CO protective gas produced during the chemical reaction and the flake graphite, the graphite is no longer oxidized during the crystallization process, thus achieving the effect of the up-drawing process.

Equipment and operating requirements for copper pipe processing and deburring:

1. Tools used: pipe cutting knife, effective ruler, positioning block. According to the size and pipe diameter required by the drawing, use a ruler to measure the corresponding length and place the positioning block. ​

2. The copper pipe needs to be positioned and fixed before being removed with a cutter. Make sure the cut is flush and not deformed. ​

3. Gloves are not allowed to be worn during operation, but gloves can be worn for deburring to prevent wool from entering the copper pipe. ​

4. During the cutting process, the copper pipe is fed evenly to ensure a smooth pipe mouth. 5. When the pipe diameter is less than (equal to) Φ12mm, multiple pipes (no more than 10) can be cut together; when the pipe diameter is greater than Φ12mm, or the copper pipe length is less than 60mm, it must be cut separately. ​

6. After blanking, the port must be deburred. A wire grinder is used for deburring. The size of the frequency converter should be adjusted according to different pipe diameters to control the machine speed. Details can be found in Table 1 below:

Pipe diameter DD<Φ7Φ7≤D≤Φ9.52Φ9.52<D≤Φ 19Φ19<D≤Φ30D≥Φ30
Inverter value19±222±227±235±246±2

7. After deburring, dry compressed air of 2.8-3.0MPa must be used to blow away the copper chips and debris inside and outside the tube.

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