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FAG bearing parts in quench cracks formed due to stress during quenching crack. Caused this crack of causes has: due to quenching heating temperature high or cooling too anxious, hot stress and metal quality volume changes Shi of organization stress is greater than steel of anti-fracture strength; work surface of original defects (as surface micro-crack or is zoned trace) or steel internal defects (as clip slag, and serious of non-metallic clip debris, and white, and shrinkage residual,) in quenching Shi formed stress set; serious of surface de carbon and carbide partial analysis of; parts quenching Hou tempered insufficient or is not timely tempered; front processes caused of cold rushed stress had large, and Forge folding knife sharp edges, oil ditch, deep turning and so on. In short, resulting in quenching cracks can be caused by one or more of the above factors, major causes of stress is the formation of quenching crack. Quenching crack deep, long and thin, flat fracture, Fracture surface non-oxidizing color. It is often a flat vertical cracks on the bearing ring or annular cracks; FAG bearings steel ball on the shape of s-shaped, t-shaped or annular. Characteristics of quenching crack is cracked on both sides without removal, significant differences and forging crack crack and material.
FAG in heat treatment of bearing parts, thermal stress and stress, stress each other within this overlay or partially offset is complex, because it is over heating temperature, heating rate, cooling, cooling rates, parts vary in shapes and sizes, so heat treatment deformation is unavoidable. Understand and master it change of FAG bearings parts deformation (oval rings, size up, and so on) where it can control the scope of production. Mechanical collision course in the heat treatment process will also make parts have the distortion, but this kind of distortion can improve operations to be reduced and avoided.
(1) as far as possible using special instruments and measurements;
(2) using the hand measurement measurements have a higher measure of skills required. This method of measurement error is large, especially when clearance is marginalized, prone to error, in which case the measure shall prevail;
(3) when measuring feeler gauge, as stipulated in the standard operation, shall not be used on the roller feeler gauge rolling past methods of measurement;
(4) the measurement process should ensure that the balls fall into the ditch; closed type bearings in front of the closed measurements; Dutch equipment measured values should be reduced by increased loading caused by clearance.
(5) for multiple-row bearings, each clearance pass taking the arithmetic average of the clearance as FAG bearing radial clearance.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7926CDF NSK | 130 | 180 | 24 |
| 7926A5DF NSK | 130 | 180 | 24 |