Classification and characteristics of grooved pipe fittings
The best pressure performance of the different diameter elbow. But due to various factors, the actual floor heating pipe wall thickness is usually in the various types of pipe wall thickness under floor heating system can meet the requirements of reducing elbow pipe pressure advantage not shown; thermal conductivity: pipe for floor heating need to have thermal conductivity, low temperature and good thermal shock resistance. Low-temperature impact resistance performance is better.
One, the production standard of different diameter bend
Elbow is now the international general standard is the United States national standard ANSIB16.9 and 16.28. The diameter size range of the standard is the 1/2 "~ 80", 24 "are generally within the seamless steel pipe used as raw material, 26" to 80 "are used in stamping steel after welding. Maximum wall thickness up to 60mm, minimum to 1.24mm. Steel is the most widely used (20#) carbon steel, alloy steel and stainless steel, 24 steel. Boiler on the CrMo steel, such as 15Cr, the amount is relatively large. Three, the diameter is in the range of 2.5 "-60", "-60" from 26 to three through welding. Wall thickness 28-60mm. Big head size range, the conventional first big specifications, and small specifications, the bulk of the minimum of 0.75 ", 0.5" big head minimum, maximum 60 ", 48" 20-60 "maximum head, welding, wall thickness of 2.8-4.5mm.
Two, different diameter bend processing technology
With the continuous development of the world economy, the continuous improvement of the level of income, our goal for the international advanced construction and shipbuilding industry and other related industries. Stamping elbow to connect pipe fittings, in the field of development of this product can play an important role, with the international first-class technical level and set sail. Stamping elbow pipe processing technology has a certain process, in the production process in accordance with the production technology of reducing elbow only small caliber pipe, if the size is too large, it is difficult to buy the product reducing elbow, can only use the welding elbow. As the welding elbow weld more, all the use of performance is not as good as the different diameter of the elbow, easy to corrosion leakage. And due to the different diameter of the elbow is a mass production, so the price is cheaper than welding elbow. There is now casting elbow, can do 316L, better corrosion resistance.
The most fitting is used for welding, in order to improve the quality of welding, the end of all vehicles into a groove, keep the certain angle, with a certain edge, this requirement is quite strict, more thick, and angle deviation range are defined. The surface quality and mechanical properties are basically the same as that of the tube. In order to convenient welding, steel pipe and the connecting pipe are the same.
Reducing elbow is composed of malleable cast iron, using the connection is different from the water supply pipe, steam pipeline, gas pipeline, pipeline diameter elbow color black, right angle camber, quality excellent wear resistance, not easy to damage reducing elbow specifications for 1/2-10 inch pipe products are widely used in petroleum, chemical industry, metallurgy the electric power industry, equipment, installation, support and other services. The detection results of different diameter elbows and the measuring thickness of the elbow were used to measure the thickness of the outer arc, the side arc and the inner arc wall thickness, and the radius of curvature, the diameter of the cross section and the length of the cross section were measured. Push the speed per minute to speed up the 15mm radius of curvature 50mm that is to accelerate the speed of the system, increase the radius of curvature.
Wear reducing elbow is one of factors that affect the safe and civilized production, with the continuous development of science and technology, material innovation, have cast stone, cast steel, alloy, centrifugal casting composite ceramic materials. Reducing elbow to produce the corresponding development plan on the development of science and technology development, in accordance with the corresponding performance, high and low temperature strength properties of alumina ceramic lined pipe in which its high wear resistance, high hardness, oxidation resistance, good corrosion resistance and high, has become one of the most widely used wear-resistant materials, occupy the world market share of special ceramics (wear-resistant materials) 80%.
Three, the advantages of different diameter bend production process
1, the elbow is suitable for oil, natural gas, chemical industry, water and electricity, construction and other industries, such as the pipeline system.
2, without tube blank as raw material, can save pipe equipment and tooling costs, and can be arbitrarily large diameter and wall thickness of the relatively thin carbon steel elbow.
3, due to the above two reasons, can shorten the manufacturing cycle, production costs greatly reduced. Because no special equipment is needed, especially suitable for the field processing of large carbon steel elbow.
4, the blank is flat or can be curved surface, so the material is simple, easy to ensure the accuracy, easy assembly and welding.
Reducing elbow is powered by conventional or special punching equipment, make sheet metal in the mold directly affected by the deformation force and deformation, and thus obtain a certain shape, size and function of the production technology product parts. The sheet metal, mold and equipment are the three elements of stamping. Stamping is a kind of metal cold deformation processing method. So called cold stamping or sheet metal stamping, referred to as stamping. It is one of the main methods of plastic processing of metal, but also forming part of materials engineering.
Four, the performance of different diameter elbow
1, long-term compressive strength, only from the design stress, the national standard of different diameter bend of the pressure performance is the best. However, due to various factors, the actual wall thickness of the floor heating pipe is usually 2mm. In this wall thickness of all kinds of pipe can meet the requirements of the floor heating, different diameter bend pipe pressure can not reflect the advantages;
2, thermal conductivity: used for floor heating pipes need to have good thermal conductivity.
3, low temperature heat shock resistance: PE--RT and PEX low temperature impact performance is better. In winter construction, the pipe is not easy to be impacted and broken, and the flexibility of the construction arrangement is increased.
4, environmental protection: PE-RT can be recycled, do not pollute the environment. And PEX can not be recycled will produce two pollution;
5, processing performance stability: PEX there is control of the degree of crosslinking and crosslinking uniformity and other issues, the processing of complex and directly affect the performance of the pipe.
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