Copper pipe is one of the fastest developing products in China copper processing material production. Drawing is the most commonly used method of tube processing, is under the action of external forces, forcing the metal billet through the die hole, in order to obtain the corresponding shape and products of plastic processing methods, with energy-saving and efficient features, but also can be used to produce a variety of cross-sectional forms of wire, bar, pipe and profile. Pipe drawing can be divided into no core head drawing (empty drawing) and core head drawing. The latter, according to the fixed form of the core head is divided into fixed core head drawing, long core head drawing and swimming core head drawing.
1. Copper tube should have a certain strength and wall thickness, can withstand the pressure of the refrigeration medium (such as Freon), to prevent its leakage.
2. Copper tube should have a good metallurgical organization and good overall mechanical properties, no metallurgical defects (such as inclusions, porosity), and has the right grain size, with a good match of strength and plasticity, so that in the manufacturing process of the two devices to withstand the smooth bending, expanding and flaring and other additions.
3. Copper tube should have good welding performance. Soldering performance is first related to the chemical composition of the copper tube, especially the appropriate phosphorus content, and surface conditions, especially cleanliness, and the tube is also an important guarantee of the safe operation of the air conditioning machine.
4. Copper tube should have good heat transfer performance. It does not refer to the thermal conductivity of the metal itself, but with the shape of the tube surface and the heat transfer coefficient of the copper tube and air thresh related to the internal threaded copper tube than the heat transfer coefficient of the light tube 2-3 times higher, collectively referred to as high-efficiency heat transfer of copper tube.
Traditional copper tube production process (extrusion method) is extruded from continuous casting billet ingots into billets, and then cold rolled, drawn into tubes. early 1990s casting and rolling method (i.e., casting billets + three-roll slanting + drawing of the pipe process) appeared, casting and rolling method of production of steel tubing has been widely used, practice shows that the casting and rolling method of production of copper tubing performance and stability and lower manufacturing costs, low energy consumption, high efficiency, to meet the demanding requirements of the air-conditioning and refrigeration industry. Air conditioning and refrigeration industry demanding requirements.
