| New Model | FAG NA6909-ZW | m | 495g |
| d(mm) | 45 | da(min) | 33 |
| B(mm) | 40 | Db(min) | 42 |
| D(mm) | 68 | Da(max) | 46 |
| C0r | 127000 | Cur | 126000 |
| Cr | 79000 | nG | 3260 1/min |
| ra | 0.6mm | nB | 3590 1/min |
Steel quenching is the steel austenitized cools at an appropriate rate, make the workpiece in cross section all or heat treatment process of martensite occurs in a certain range of NA6909-ZW bearing unstable organizational structure change.
A process of hardened workpieces.
General workpiece: quenching, tempering, cleaning, sand blasting (or shot) surface cleaning and inspection.
Shaft parts and easy deformation of NA6909-ZW bearing workpiece: quenching, cleaning, tempering, straightening, stress treatment, sandblasting, inspection.
Two quenched the preparation before.
(1) check the workpiece number, material and size, defects affect the quality of quenching and check the workpiece without cracks, bumps, lack of edge, sharp edge, sharp and corrosion etc..
(2) according to the drawings and process documents, clear the specific requirements of quenching, such as hardness, partial quenching range.
(3) according to the requirements of NA6909-ZW bearing design and selection of quenching, the fixture workpiece right, some proper binding, in easy to produce crack site, take the corresponding protective measures, such as metal bands or asbestos rope wrapped and plugging.
(4) the surface of the workpiece does not allow oxidation and decarburization, should vacuum protective atmosphere furnace heating in salt bath furnace or pre, or take the following precautions:
A. coating, recommended the following coating formulation:
The 10% graphite grease +90% (mass fraction).
The 100gSiO2+5gAl2O3+25gNaSiO3+40gH2O. thermal coating 0.05~0.10mm, when the heating temperature is lower than 1050 DEG C with the anti oxidation and decarbonization.
The 20gSiO2+10Al2O3g+10g 10gCr2O3+10gSiC+8gKSiO3+12~15gH2O0 0.2~0.30mm coating feldspar heat, the heating temperature is lower than 1200 DEG C with the anti oxidation and decarbonization.
B. will be the iron box filled with scrap iron workpiece into charcoal or have been used in the seal.
(5) a large number of the workpiece must be a single piece or small batch trial spinning, establishing a process that can be used only for the batch quenching, and often sampling in the production process.
