Bearing steel pipe refers to hot-rolled or cold-rolled (cold-drawn) seamless steel pipe for the manufacture of ordinary rolling bearing rings.
Bearing steel pipe process
Tube blank cutting → heating perforation → spheroidizing annealing → pickling phosphorus saponification → cold drawing (rolling) → stress relief annealing → finished product straightening → finished product cutting → finished product inspection → packaging and storage → factory delivery
Introduction to the process of bearing steel pipe
Tube blank cutting: The bearing steel round steel is cut by plasma cutting method according to the process size requirements.
Heating perforation: the cut round steel is placed in an inclined bottom furnace to be heated, and the heating temperature is capped at about 1130 °C. The furnace is rolled out and perforated by a punching machine to achieve the outer diameter and wall thickness requirements of the process. For the drawing of the capillary, the forging head is required, and the cold-rolled capillary does not require the forging.
Spheroidizing annealing: The perforated capillary tube is loaded into a continuous spheroidizing annealing furnace for spheroidization treatment to obtain a spheroidized structure that meets the processing requirements, so that the capillary tube can be subjected to cold drawing or cold rolling processing.
Pickling, phosphorus saponification: the spheroidized capillary tube is washed by acid washing to clean the iron oxide skin existing on the inner and outer surfaces, and then phosphatized after washing with water to form a phosphating layer of sufficient thickness on the surface of the capillary tube to facilitate adsorption and lubrication during saponification. Agent. Saponification is to cover the surface of the inner and outer walls of the capillary with lubricant, so that the steel pipe reduces frictional resistance during processing and avoids processing defects.
Cold drawing and cold rolling: cold drawing is to pull the capillary tube or the intermediate tube through the inner mold and the outer mold in the drawing machine to achieve the size reduction and wall reduction process requirements, and meet the specifications of the finished product through several passes of processing. Cold rolling is carried out by rolling and rolling on a cold rolling mill to achieve the dimensional requirements specified in the process.
Stress-relieving annealing: The cold-drawn and cold-rolled steel pipes are placed in a continuous annealing furnace in time for stress relief annealing to achieve the required hardness and mechanical properties of the finished steel pipe, or to achieve the processing performance required for the production of the intermediate pipe.
Straightening of finished steel tube: The annealed steel pipe is passed through a straightening machine to correct the bending and other deformations to meet the flatness required for the quality of the steel pipe.
Finished bearing steel pipe cutting: According to the requirements of the process specification, the forging head part required for the drawing process is cut off, the head and tail dimensions are not up to standard and other steel pipe defects are not met.
Inspection of finished products of bearing steel pipes: According to the technical standards and customer requirements, the steel pipes produced shall be inspected, the qualified products shall be sent to the packing process, and the defective products with defects shall be re-inspected after the process of re-cutting, rework and other processes.
The bearing steel pipe is packed into the warehouse: the finished product that has passed the inspection is packaged, metered, and the logo is attached and stored.
Bearing steel pipe delivery: According to the customer's delivery time requirements, the steel pipe is shipped and the factory quality certificate is issued.