Mechanical processing of seamless steel pipe

Seamless steel pipe refers to the whole round steel perforated, no welded seam on the surface of the steel pipe, widely used in the manufacture of structural and mechanical parts, such as oil drilling rods, automotive drive shafts, bicycle frames and steel scaffolding used in building construction with steel pipe manufacturing ring parts.

Seamless steel pipe accepted load method is not the same, the choice of rolling bearing collaboration should be different level of tightness, when the acceptance of fixed immobile load, collaboration should be loose, so that rolling bearings in machinery and equipment with demolition more convenient, but can not be too loose, or it will cause dragging in the collaborative parts and make the collaborative surface wear, therefore, should generally take the articulated collaboration or have very little clearance gap collaboration.

Seamless steel pipe inner and outer wall high precision, smoothness. After heat treatment, seamless steel pipe has no air oxide layer and high cleanliness. Cold drawn seamless tubing bears high pressure, cold-drawn without deformation, squeeze flattening pent-up without cracks. Seamless steel pipe can be used for a variety of complicated deformation and mechanical processing manufacturing. Pipe tone: milky white, bright, high metallic texture.

When seamless steel pipe accept rotating load, should choose over-tight collaboration, in order to prevent this throw ring in collaboration parts dragging, so that the collaboration surface produce abrasion, but the amount of interference can not be very large, otherwise it will make the rolling bearing internal side gap reduced to completely recede, produce excessive contact pressure, resulting in shaft abrasion accelerated, affecting its service life.

Seamless steel pipe has no air oxidation layer on the inner and outer walls, high pressure resistance without leakage, high precision, high smoothness, cold-drawn deformation, squeezed flat without cracks, and it is key to produce standard pneumatic or pressure component products. Components, such as cylinders or pneumatic cylinders, can be seamless steel tubes or welded tubes. Precision steel pipe composition is carbon, silicon, manganese, manganese, sulfur, phosphorus, chromium, chromium.

Seamless steel pipe production steps: the pipe material through the active rolling mill on the continuous cold rolling after the entire mechanical equalization of the wall thickness, by the sizing machine sizing, to reach the specification, the application of continuous rolling mill production hot tie seamless steel pipe is a better method, generally in the two-roller extrusion machine, seamless steel pipe in the variable cross-sectional circular hole groove and no moving cone-shaped top edge constituted by the annular plate hole cold rolling, cold drawing is generally in the multi-peptide chain type or double Cold drawing is generally carried out on a polypeptide chain or double chain type cold drawing machine, in which the already heated pipe material is put into a closed kneading drum, and the hole-breaking bar works out together with the kneading bar, this method can produce smaller seamless pipe specification.

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