Industry News

The most commonly used drawing processing method of copper pipe

2021-06-08
Red copper pipe is one of the fastest developing products in China's copper processing material production. Drawing is the most commonly used method of pipe processing, is under the action of external force, forcing the metal billet through the die hole, in order to obtain the corresponding shape and plastic processing method of products, with the characteristics of labor-saving and efficient, can also be used to produce a variety of cross section form of wire, bar, pipe and profile. Pipe drawing can be divided into coreless drawing (empty drawing) and cored drawing. The latter is divided into fixed core head drawing, long core head drawing and moving core head drawing according to the fixed form of core head.
Jiake copper pipe fittings to share with you the most commonly used copper pipe drawing processing methods
1. Copper tube should have a certain strength and wall thickness, can withstand the pressure of refrigerating medium (such as Freon), to prevent its leakage.
2. Copper tube should have good metallographic structure and good comprehensive mechanical properties, no metallurgical defects (such as inclusion, pores), and has the appropriate grain size, with a good match of strength and plasticity, in order to smoothly withstand the bending, expansion and flared pipe in the manufacturing process of the two devices.
3. Copper pipe shall have good weldability. The welding performance is first related to the chemical composition of the copper tube, especially the appropriate phosphorus content, and the surface condition, especially the cleanliness, and the cleaning degree in the tube is also an important guarantee for the safe operation of the air conditioner.
4. Copper tubes shall have good heat transfer performance. It does not refer to the thermal conductivity of the metal itself, but the heat transfer coefficient related to the shape of the pipe surface and the copper pipe and air rotary, the heat transfer coefficient of the internal threaded copper pipe is 2-3 times higher than the light pipe, collectively referred to as the efficient heat transfer copper pipe.
The traditional copper tube production process (extrusion method) is composed of continuous casting billet ingot extrusion into tube billet, and then through cold rolling, drawing processing into pipe. In the early 1990s, after the casting and rolling process (i.e., the pipe making process of casting billet + three-roll cross rolling + drawing) appeared, the steel pipe produced by casting and rolling method has been widely used. The practice shows that the copper pipe produced by casting and rolling method has stable performance, low manufacturing cost, low energy consumption and high efficiency, which can meet the harsh requirements of the air conditioning and refrigeration industry.