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INA bearings in selection:
Axis is based on two bearings in radial and axial support, at this point, the INA bearing is called a fixed-side on one side of the bearing, which bear both radial and axial loads, fixed relative axial displacements between shaft and housing. Call free on the other side, only take radial loads, axial can be relatively mobile, as a solution to scale axis due to temperature change problems and install error bearing intervals.
For fixed-side bearing, select scroll available in axial movement (such as cylindrical roller bearings) or Assembly move (such as radial ball bearing) bearing. On the short axis, fixed side and free side no other cases, using only unidirectional fixed axial movement of the bearing (such as radial thrust ball bearings)
INA bearing heat treatment and quality defects:
1. quenching crack
In quenching process of bearing parts crack quench cracks formed due to stress. Formed this crack of causes has: because quenching heating temperature through high or cooling too anxious, hot stress and metal quality volume change Shi of organization stress is greater than steel of anti-fracture strength; task appearance of original shortcomings (as appearance micro-crack or is zoned trace) or steel external shortcomings (as clip slag, and major of non-metallic mix debris, and white, and shrinkage remaining,) in quenching Shi formed stress set; major of appearance de carbon and carbide partial analysis of; parts quenching Hou tempered lack or is not timely tempered; behind processes formed of cold rushed stress had large, and Forging collapses, Groove of deep-cutting knife, and sharp edges. In short, the formation of quenching crack of the cause can be one or more of the above factors, internal stresses are important causes of formation of quenching crack. Quenching crack of deep and long, flat fracture, Fracture surface non-oxidizing color. It is often a flat vertical cracks on the bearing ring or annular cracks; in bearing steel ball shape on s-shaped, t-shaped or annular. Organizational characteristics of quenching crack is cracked on both sides without removal scene, significant differences and forging crack crack and information.
2. overheating
INA bearing crude over the opening of an inspection to the microstructure of quenched to overheat, but did tell their overheated levels required inspection of microstructure. If quenching of steel gcr15 needle-like martensite in the Organization, to quench hot organization. Formation causes of hardening heating temperature through high insulation or heating time is too long to form partial overheating; or it can be from the original organization banded carbide major, in between two low-carbon areas form a large part of the horse's body, forming part from overheating. Overheating in the organization increased residual austenite, landing dimensions solidity. Because the hardened tissue overheating, large crystals of steel, may result in parts landed toughness, impact resistance landing, landing bearing life. Significant quenching cracks can form even overheating.
3. surface decarburization
INA bearing parts in the heat in the course of solving if heating in oxidizing media appearances will attack oxidation increases the parts of appearance carbon mass fraction, the formation of surface decarbonization. Appearance of decarburized layer depth beyond the last processing allowance would make parts for scrap. Determination of surface decarbonization layer depth available in metallographic test method of metallographic and micro-hardness method. Measurement for surface microhardness spreading outside curves, can do arbitration criterion.
4. thermal settlement deformation
INA bearing parts in hot solution, thermal stress and stress, this stress can overlap each other or part cancellation, are complex and varied, as it can with the heating temperature, heating rate, cooling, cooling rates, parts change and changes of shape and size, so hot against the deformation was not. Familiar and controlled it changed rules to make the deformation of the bearing components (such as the oval ring, sizes up) where it can control the size of consumer-friendly. Course in thermal solutions to mechanical collisions in the course will also allow the onset of deformation of parts, but this distortion is to be increased with improved operations and prevent.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 4T-HM88648/HM88611AS NTN | 35.717 | 72.626 | 25.4 |
| 4T-HM88648/HM88610 NTN | 35.717 | 72.233 | 25.4 |