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Structural Features and Introduction of Eccentric Reducers
Release time:
Oct 30,2021
An eccentric different-diameter pipe is a pipe fitting used for changing the diameter of a pipeline. Common forming processes can be employed to reduce the smaller diameter, enlarge it, or even expand the larger diameter. Additionally, stamped eccentric pipes of specific specifications can also be produced.
An eccentric reducer is a pipe fitting used to change the diameter of a pipeline. Common forming processes can be employed to reduce the smaller diameter, enlarge the larger diameter, or both. Additionally, stamped reducers of specific specifications can also be produced. Besides manufacturing reducers from steel pipes, certain sizes of reducers can also be produced using stamping processes on steel plates. The shape of the die used in the drawing process is designed based on the dimensions of the inner surface of the reducer. After blanking, the steel plate is formed by stamping.
Structural features of eccentric reducers
The display method for eccentric reducers is to multiply the diameter of the larger end by the diameter of the smaller end and then by the wall thickness.
Eccentric reducer standards: national standards, American standards, British standards, and various non-standard high-pressure stamped fittings.
The shrinkage forming process for eccentric reducers involves placing a tube blank—whose larger end diameter matches that of the reducer—into a forming die. Pressure is then applied axially along the axis of the tube blank, causing the metal to flow and contract within the cavity of the die. Depending on the degree of reduction required, the process can be carried out in a single pressing stage or multiple pressing stages.
The characteristic of eccentric reducers is that, for the same carbon content, they have a much higher specific strength than carbon steel, and also exhibit excellent toughness, ductility, weldability, and corrosion resistance.
The roundness of the reducer pipe shall not exceed 1% of its end outer diameter, with an allowable deviation of 3 mm. The materials for the throttling devices shall comply with SY/T5037, GB/T9711, GB/T8163, U.S. standards ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, and ASTM A234.
A reducer (size reducer) is a pipe fitting used to change the diameter of a pipeline. Common forming processes include shortening and expanding.
A. Shorten/Expand Molding
The shrinkage forming process for eccentric reducers involves placing a tube blank—whose diameter equals that of the larger end—into a forming die and applying axial pressure along the axis of the tube blank, causing the metal to flow and contract within the cavity of the die. Depending on the degree of tube transformation required, the process can be carried out in a single pressing stage or multiple pressing stages.
Diameter-expanding forming involves a tube blank whose diameter is smaller than the larger end diameter of a reducer pipe. In this process, an internal die is used to extend and shape the blank along its inner diameter. The expansion process primarily addresses the challenge of forming large-diameter transistors that would otherwise be difficult to produce via contraction alone. In certain cases, depending on the material and the specific shaping requirements of the product, both expansion and contraction methods may be employed simultaneously.
During the deformation process of contraction or expansion, whether cold pressing or hot pressing is chosen depends on the material and the transition conditions. As a general rule, cold pressing should be used whenever possible; however, if multiple transitions lead to severe work hardening, if the wall thickness is very thick, or if the material is alloy steel, hot pressing must be employed.
B. Stamping
In addition to manufacturing reducer fittings from steel pipes, certain specifications of reducer fittings can also be produced using a stamping process on steel plates. The shape of the die used for stretching is designed based on the inner surface dimensions of the reducer fitting, and after blanking, the steel plate is stretched using a press.
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