The different diameter elbows have the best pressure resistance. 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 tolerance of the different diameter elbow pipe can not be reflected; thermal conductivity: The pipe for floor heating needs good thermal conductivity, low temperature thermal shock resistance and low temperature impact resistance.

First, the production standard of the reducer elbow

The international standard for elbows is the US national standards ANSI B16.9 and 16.28. The standard outer diameter range is 1/2 〃 ~ 80 〃, generally within 24 都是 are made of seamless steel pipe, 26 〃 to 80 〃 are stamped with steel and then welded. The wall thickness can be up to 60mm and the minimum is 1.24mm. The most used steel grades are carbon steel (20#), alloy steel and stainless steel, with a total of 24 steel grades. The CrMo steel used in the boiler is like 15Cr, which is relatively large. The three-way, the outer diameter ranges from 2.5〃-60〃, from 26〃-60〃 to the welded tee. The wall thickness is 28-60mm. Size range of specifications, conventionally said first big head specifications, then small head specifications, the big head minimum 0.75 〃, the small head minimum 0.5 〃, the big head maximum 60 〃, the small head maximum 48 〃, 20-60 〃 for welding, wall thickness 2.8 -4.5mm.

Second, the different diameter elbow processing technology

With the continuous development of the world economy and the continuous improvement of income levels, our goal is to face the international advanced construction industry and shipbuilding industry. The stamping elbow is mainly based on connecting pipe fittings. It can take on the heavy responsibility in the development of this product and set sail with international first-class technical level. The processing technology of stamping elbow pipe fittings has a certain process. In the production, according to certain process technology, the production of different diameter elbow can only be done with small caliber. If the pipe size is too large, it is difficult to buy the finished reaming elbow. Use welding elbows. Due to the more welds in the welded elbows, all the performances are not as good as the different diameter elbows, which are easily corroded. And since the different diameter elbows are produced in batches, the price is cheaper than the welded elbows. There are now cast elbows that can be made of 316L for better corrosion resistance.

Since most of the pipe fittings are used for welding, in order to improve the welding quality, the ends are all turned into bevels, leaving a certain angle with a certain edge. This requirement is also stricter, the thickness is too thick, the angle is how much and the deviation range is There are regulations. The surface quality and mechanical properties are basically the same as the tube. For the convenience of welding, the pipe is the same as the steel of the pipe to be connected.

The different diameter elbow is made of malleable cast iron. It is used in the water supply pipe, steam pipe, gas pipe and oil pipeline. The connecting reaming elbow is black, with right angle camber, excellent quality and wear resistance, and it is not easy to damage the reaming elbow. The specification is 1/2-10 inch. The products are widely used in pipeline installation, installation and supporting services in petroleum, chemical, metallurgy and electric power industries. The detection results of the different diameter elbow and the thickness gauge of the outer arc, the side arc and the inner arc were measured by the thickness gauge of the push elbow, and the curvature radius, the port cross section diameter and the length machining allowance were detected by the platform scribing method. The pushing speed is increased by 15mm per minute. The radius of curvature is increased by 50mm, that is, the pushing speed is increased and the radius of curvature is increased.

The wear of the different diameter elbow has always been a factor affecting the safety and civilized production. With the continuous development of science and technology, the materials are also constantly innovating, and successively cast stone, cast steel, alloy, centrifugal cast composite ceramics and other materials. Reducing elbows have corresponding development plans in the development of science, according to the corresponding technical development and performance, in which the pipeline-lined alumina ceramics have high wear resistance, high hardness, oxidation resistance, corrosion resistance and extreme High resistance to high and low temperature strength has become the most widely used wear-resistant material, accounting for about 80% of the world's special ceramics market share (wear-resistant materials).

Third, the advantages of the different diameter elbow manufacturing process

1. Reducing elbows are suitable for pipeline systems in the petroleum, natural gas, chemical, hydropower, construction and boiler industries.

2. No need for tube blanks as raw materials, which can save the cost of pipe making equipment and molds, and can obtain carbon steel elbows with any large diameter and relatively thin wall thickness.

3. Due to the above two reasons, the manufacturing cycle can be shortened and the production cost is greatly reduced. It is especially suitable for processing large carbon steel elbows on site because it does not require any special equipment.

4. The blank is flat or expandable surface, so the material is simple to cut, the precision is easy to guarantee, and the assembly and welding are convenient.

Reducing elbows are the power of conventional or special stamping equipment to directly deform the sheet material in the mold and deform it to obtain a certain shape, size and function of the product parts. Sheets, molds and equipment It is the three elements of stamping processing. Stamping processing is a metal cold deformation processing method. Therefore, it is called cold stamping or sheet stamping, referred to as stamping. It is one of the main methods of metal plastic processing, and is also subject to material forming. Engineering technology.

Fourth, the performance of the reducer elbow

1. Long-term pressure resistance performance, only in terms of design stress, the pressure resistance performance of the national standard different diameter elbow is the best. 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 different-diameter elbow pipe can not be reflected;

2. Thermal conductivity: The pipe used for floor heating needs good thermal conductivity.

3, low temperature thermal shock resistance: PE--RT and PEX low temperature impact resistance is better. The pipe is not easily damaged by impact during construction in winter, which increases the flexibility of construction arrangements.

4. Environmental protection: PE-RT can be recycled and used without polluting the environment. And PEX can not be recycled to produce secondary pollution;

5, processing performance stability: PEX has the problem of controlling the degree of cross-linking and cross-linking uniformity, processing is complex and processing directly affects the performance of the pipe.

PVC veneer wood slat panel

PVC Veneer Wood Slat Panel,Decoration Wall Panel,Decorative Wood Panels,Interior Wall Panel

Hebei RooAoo New Material Technology Co.,Ltd. , https://www.raacoustic.com