Eccentric different-diameter pipe is a type of pipe used for pipe diameter reduction. The forming process is usually used for reduction of diameter, expansion of diameter or reduction of diameter and expansion, for certain specifications. Different diameter pipes can also be formed by stamping.
Structural features
The roundness of the reducer should not be greater than 1% of the outer diameter of the corresponding end, and the allowable deviation is ±3 mm. The material of the reducer is SY/T5037, GB/T9711, GB/T8163, American Standard ASTM A106/A53 GRB, API 5L, APT5CT, ASTM A105, ASTM A234, ASTM A106, DIN German Standard and Customer Requirements
A reducer (size head) is a type of pipe used for pipe diameter reduction. The forming process usually adopted is a reduction press, a diameter expansion press, or a reduction and diameter expansion press. For certain sizes of different diameter pipes, press forming can also be used.
a. Reduced diameter / expanded diameter forming
The reduction diameter forming process of the reducer is to put the tube blank having the same diameter as the large end of the reducer into the forming mold, and to move the metal along the cavity and shrink and form by pressing in the axial direction of the tube blank. According to the size of the reducer of the reducer, it is divided into one press forming or multiple press forming. The figure below shows the reduced diameter forming of the concentric reducer.
The expanded diameter forming adopts a tube blank smaller than the diameter of the large end of the different diameter tube, and is formed by expanding the inner diameter of the tube blank by the inner die. The diameter expansion process mainly solves the problem that the reducer having a large reduction diameter is not easily formed by the diameter reduction, and sometimes the method of expanding the diameter and reducing the diameter is combined according to the material and product forming requirements.
In the process of reducing or expanding the deformation and deformation, it is determined that cold pressing or hot pressing is adopted according to different materials and the diameter reduction conditions. Under normal circumstances, cold pressing is used as much as possible, but in the case of severe work hardening caused by multiple reductions, thick wall thickness or alloy steel material, hot pressing is preferred.
b. Stamping forming
In addition to the use of steel pipes as raw materials for the production of different diameter pipes, the partial diameter of the different diameter pipes can also be produced by the stamping forming process. The shape of the die used for the drawing is designed with reference to the inner surface size of the reducer, and the steel sheet after the blanking is punched and formed by a die.
classification
1. Divided by material:
Carbon steel: ASTM/ASME A234 WPB, WPC
Alloy: ASTM/ASME A234 WP 1-WP 12-WP 11-WP 22-WP 5-WP 91-WP911, 15Mo3 15CrMoV, 35CrMoV
Stainless steel: ASTM/ASME A403 WP 304-304L-304H-304LN-304N
ASTM/ASME A403 WP 316-316L-316H-316LN-316N-316Ti
ASTM/ASME A403 WP 321-321H ASTM/ASME A403 WP 347-347H
Low temperature steel: ASTM/ASME A402 WPL3-WPL 6
High Performance Steel: ASTM/ASME A860 WPHY 42-46-52-60-65-70
Cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon leaching, PVC, PPR, RFPP (reinforced polypropylene).
2. Divided by the production method can be divided into push, press, forge, casting and so on.
3. According to the manufacturing standards, it can be divided into national standard, electric standard, ship standard, chemical standard, water standard, American standard, German standard, Japanese standard and Russian standard.
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