The rolling bearing production process flow has the following main processes.
Forging is an important link to ensure the reliability and life of the bearing. After the raw material is forged, the bearing ring blank is formed. At the same time, the organization of the raw material becomes denser and the flow line becomes better, which can improve the bearing reliability and service life. In addition, the forging process will directly affect the utilization rate of raw materials, thus having an impact on production costs.
Heat treatment is the high temperature treatment of bearing rings after forging and turning. It directly affects the uniformity of carburization in bearing rings, which can improve the wear resistance and hardness of bearings, and is also an important factor affecting the reliability and life of bearings.
Bar – forging – turning – heat treatment – grinding – super finishing – final inspection of parts – rustproof storage cold rolling machine, automatic ball bearing internal grinding machine, quenching line, annealing furnace, press, CNC lathe, bearing grinding machine, internal groove grinding machine, external groove grinding machine, high precision horizontal shaft circular surface grinding machine, CNC milling machine, centerless grinding machine, high precision through grinding centerless grinding machine, precision groove super finishing research machine, internal surface CNC grinding machine, CNC reciprocating double-end grinding machine, high-temperature and high-speed bearing testing machine, heat treatment production line and quality testing equipment, etc.
Due to the different types of rolling bearings, structure type, tolerance level, technical requirements, materials and batch, the basic production process is not exactly the same.
In the needle roller bearing manufacturing process, the actual to be more complex, there are 70 production steps. Needle roller bearing processing process requirements are very high, especially heat treatment, forging, grinding process link precision requirements are very strict, we attach great importance to these production processes, to ensure that the factory bearings qualified.
Unannealed bar material → forging → annealing (normalizing) → turning processing → heat treatment (quenching – tempering) → grinding processing → finishing (super-finishing research) → final inspection of the parts → rust prevention → storage.
Bar (disk material) → upsetting ball blanks → (to go to the ring with) → light grinding (light ball) → heat treatment (quenching – tempering) → hard grinding → fine grinding → fine research (grinding) → final inspection grouping → cleaning, rust prevention, packaging → into storage
Bar (disk material) → upsetting blanks (turning) → to the ring belt → soft grinding → heat treatment (quenching – tempering) → hard grinding → string soft point → fine grinding outer diameter → rough grinding end face → final grinding end face → fine grinding outer diameter → final grinding outer diameter → (super fine outer diameter) → final inspection grouping → rust prevention, packaging → storage
Plate material → shear strip material → punching → stamping forming → shaping and finishing → pickling or shot blasting or stringing → final inspection → rust prevention, packaging → storage
Tube material → turning inside, outside diameter, end face → drilling (or drawing hole, boring) → deburring → pickling, final inspection → oiling, packaging → storage
Insulated bearings include all rolling bearings that can cut off the current circuit and have insulating properties.
The inner ring and the outer ring in the bearing consisting of the rolling body located between the inner ring and the outer ring into the cleaning device, cleaned with organic solvents such as gasoline, to obtain the cleaned outer ring.
The surface of the outer ring facing outward after cleaning treatment and other non-sprayed surfaces other than the upper and lower surfaces of the outer ring are shielded with shielding tape for protection.
Roughening the surface to be sprayed by sandblasting device to expose the metal substrate to a fresh active surface, increase the mechanical embedding between the sprayed particles and the substrate, and then preheat the substrate to reduce the temperature gradient between the sprayed droplets and the substrate and reduce the thermal stress.
N2 and H2 are used as plasma gas, spraying working current 500 volts (DC), voltage 74~80KV, powder feeding speed 3kg/hour, matching with plasma flame power. The spraying distance is about 50~100mm, and the spraying angle is as close to 90 degrees as possible.
The insulation performance, strength and environmental adaptability of the coating were tested.
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