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1. overheating
Seen from the TIMKEN bearings scenes Justice on microstructure of quenched from overheating. But to appropriate to judge the degree of overheating must view the microstructure. GCr15 steel quenched thick needle-like martensite, hardening heat organization. Constitute a reason may be hardening heating temperature through heating or insulation is a long time to form comprehensive overheating; fruit started organizations banded carbide may also be critical, are two low carbon between constituted local Markov acupuncture is thick, the formation of local overheating. Hot residual austenite outside the Organization and size invariance declined. Quenched overheated steel large crystals, will result in lower part of toughness, anti-shock function decreased bearing life is reduced. Overheating severe quenching cracks can be formed.
2. less heat
Quenching temperature on the microstructure of low or poor cooling is outside over the delineation of troostite organization, known as the due to the heat organization, bringing down soft, abrasion resistance sharply reduced, affecting the service life of the bearing.
3. quenching crack
TIMKEN bearing parts are constituted by the quenching process of fruit when crack quench cracks. Formed that class crack of cause no: because quenching heating temperature through high or cooling too rush, hot Dang force and metal volume volume volume changes Shi of organization Dang force is greater than steel of anti-break strength; workers do profile of this no defects (as profile micro-crack or classified marks) or steel internal defects (as clip slag, and serious of non-metallic clip pure property, and white, and shrinkage broken,) is quenching Shi constitute Dang force set outside; serious of profile off carbon and carbide partial analysis of; parts quenching Hou tempered is not timely tempered; front processes formed of cold rushed Dang force had large, and forged system collection stack SCAR, oil trench, deep turning sharp corners, and so on. Per cent, forming reasons for quenching crack may be one or more of the above elements of class, when no constitutes secondary sources of quenching crack. Quenching crack deep, slender, fracture song, cutting plane no oxidation. It is often on the bearing ring is captured to a flat annular crack crack or curl; profile s-free bearing steel ball-shaped, t-shaped or ring-shaped. Characteristics of quenching crack is cracked on both sides without removal, except take the crack and forged material cracks.
4. thermal deformation of disposal
TIMKEN bearing parts are hot at the disposal, without force and organization when no heat when force, when forces of the kind that can overlay or sector offset each other, complex pure is changing, because of its speed, cooling system, heating and cooling heating temperature, speed changes, changes in the shape and size of the part, so heat disposal variants are not. Realization and control of it changes discipline to make the deformation of the bearing parts (such as oval ring, size falls) in the controlled areas, Euro-friendly. Thermal disposal of mechanical touch can also make parts for deformation, deformation is of the sort that could do with improvement be reduced and avoided.
5. Overview of decarburization
TIMKEN bearing parts are heat disposal processes, oxidative quality plus if it is hot, fact did part overview of carbon dioxide weight fraction reduction formed profiles decarbonization. Overview of decarburized layer depth over the initial processing of the parts for scrap. Profiles of decarburized layer depth determination of metallurgical metallographic method of identification available outside and micro-soft method. Profile micro-soft-measuring method to associate the distribution curve, can do arbitration criterion.
6. soft point
Because the heating without feet, poor cooling, quenching formed the fuck is wrong with sources bearing profiles of local density deficiency is known as quenching soft points. As can form as a survey of decarburization profiles wear resistance and strength of listless severe decline.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-332/32 NTN | 32 | 65 | 26 |
| 4T-320/32X NTN | 32 | 58 | 17 |