The punching elbow processing technology has a certain process. In the production, according to a certain process technology, the production of the punching elbow can only be done with a small diameter. If the pipe size is too large, it is difficult to buy the finished stamping elbow, and only the welding bend can be used. head. Due to the more welds in the welded elbows, all the performance is not as good as the punching elbows, which are easily corroded.
First, the characteristics of the stamping elbow
The stamping elbow is resistant to corrosion by weak corrosive media such as air, steam, water, and chemically etched media such as acid, alkali, and salt. In practical applications, steels resistant to weak corrosive media are often referred to as stainless steel stamping elbows, while steels resistant to chemical media are referred to as acid-resistant steels. Due to the difference in chemical composition between the two, the former is not necessarily resistant to chemical media corrosion, while the latter generally has rust.
The stamping elbow has the best pressure resistance performance only in terms of design stress. However, due to various factors, the actual wall thickness of the floor heating pipe is usually such that under this wall thickness, all kinds of pipes can meet the requirements of floor heating, and the pressure resistance of the national standard stamping elbow pipe is not reflected; thermal conductivity: The pipe for floor heating needs good thermal conductivity, low temperature thermal shock resistance and low temperature impact resistance.
It is resistant to temperature, pressure, flexibility and heat, and its performance is higher than other plastic pipes. Easy installation and good thermal conductivity for floor heating systems, recyclability. The stamped elbow pipe has excellent impact strength, hot melt welding and mechanical connection, which is superior to the thermal conductivity of PB-PP-R. Long-term pressure resistance performance, only in terms of design stress, the national standard stamping elbow has the best pressure resistance performance. However, due to various factors, the actual wall thickness of the floor heating pipe is usually 2 mm. Under this wall thickness, all kinds of pipes can meet the requirements of floor heating, and the pressure resistance of the national standard stamping elbow pipe can not be reflected;
The wear of industrial stamping elbows has always been a factor affecting safe and civilized production. With the continuous development of science and technology, materials are also constantly innovating, and successively cast stone, cast steel, alloy, centrifugal cast composite ceramics and other materials. Among them, the pipeline-lined alumina ceramic has become the most widely used wear-resistant material due to its high wear resistance, high hardness, oxidation resistance, corrosion resistance and high resistance to high and low temperature strength, occupying the world's special ceramics. About 80% of the market share (abrasion resistant material).
In foreign countries, industrial enterprises generally use wear-resistant ceramics for wear-resistant linings, including Kyocera (KYOCERA), Kyushu Industrial and German BMW, and other high-alloy porcelain linings and wear-resistant parts.
Second, the main types of stamping elbows
1. Variable diameter stamping elbow, the diameter of a part of the pipe end or the pipe is reduced;
2. A stamping elbow with a variable wall thickness means that the wall thickness changes along the length of the pipe;
3. Change the stamping elbow of the section, and change the circular section into a square, an ellipse, a polygon, etc. according to the requirements;
4. Bending the punching elbow, we have more contact, that is, the straight pipe is changed into a bend with different radius of curvature, such as elbows, bends, etc.;
5. A stamping elbow with a flange and a rounded edge, the former means that the end of the pipe is convex toward the inside or the outside, and the latter refers to a punching elbow which forms a bulge or a groove in the circumferential direction of the pipe;
6. Stamping elbows with crimping and sealing type, increasing the total strength of the pipe end to the outer side or the inner side of the pipe or the punching elbow which seals the end of the punching elbow;
7. Expand the diameter of the punching elbow, and expand the end of the punching elbow or a certain part to form the punching elbow of various shapes.
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