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First, the center offset method
Bearing ring inner, outer diameter rescue
First part exists at each defect (asymmetric) sizes accurately measured, calculated wherein the minimum grinding amount (grinding) to the finished size deviation M, and then grinding the parts for the center offset ( toward the direction of the defect increases the grinding capacity offset), the maximum offset of M / 2, i.e. the defect is relatively increased grinding capacity, focusing grinding.
Ferrule, outer raceway rescue
, You need to accurately measure the bearing ring grinding design basis for ID or OD (outside) diameter after that first grinding grinding raceway, circle example, if the inner raceway asymmetric type defects Part diameter size, and calculate the the maximum grinding amount M and the inner raceway defect at the maximum wear amount of M1. When M1 <M, in the grinding of the inner diameter on the need to inner race center offset, the maximum offset amount of M1 / 2, i.e. the in processing inner diameter give inner raceway defect advance relative increase in the grinding capacity, and then grinding of an internal raceway defects will be the focus of grinding scrap was saved. When M1 ≥ M the normal grinding mill can not afford to save about 1.1 can be used depending on the circumstances.
Using the the center offset method of grinding parts hardness carburized layer depth premise is to ensure the total offset can not be completed in an offset grinding is generally divided into several grinding through the offset test grinding - Measurement - adjust the offset - try grinding process repeated until the defects worn, re-alignment, the normal grinding correction ovality. Lower the efficiency of this method, and requires the operator to have a higher level of technology, but in a higher success rate using this method to save a stand-alone, single-piece production, not to delay the production schedule. Verified after a few years of practice to good effect.
Heat treatment up Method
The bearing steel quenching organization quenched martensite, a small amount of undissolved secondary carbides and about 12% to 14% of retained austenite. Quenched martensite and residual austenite is unstable tissue, the decomposition of the martensite in tempering process of the steel volume shrinkage, and the decomposition of the residual austenite volume swell of the steel.
As the tempering temperature increased, the decomposition amount of residual austenite is increased, under the conditions to ensure that the process requirements hardness appropriate to increase the tempering temperature, the residual austenite decomposition into hematocrit martensite organizations, allows the workpiece volume correspondingly increases, i.e. the relative increase in amount of the outer diameter grinding allows bearing rings defects become scrap parts to be salvaged in normal grinding conditions, using this method.
This method for the retained austenite content of thick, heavy workpieces (especially for the self-aligning roller bearings) effect than significant. Actual production for different specifications, different sizes, different thickness of parts developed different tempering process, under the premise of ensuring the hardness and deformation, so that the organizational changes fully, resulting in a large rose-shaped, with a corresponding increase grinding capacity, save waste .
Third, the chemical deposition method
Dimensional tolerances beyond bearing parts of the design standards, the chemical deposition method can be used to save. The principle of the chemical deposition through a variety of chemical reaction between the chemical raw material, evenly generated surface of the part of a certain thickness of the metal plating layer, by attaching tempered to ensure hardness and mechanical properties of the metal layer and the original parts. Chemical deposition only increases the size of the parts, does not change the shape of the tolerances of the parts, so for dimensional tolerances tolerance parts, using chemical deposition is an effective method of rescue, at present, the maximum unilateral deposition thickness of up to about 0.1mm.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7019ATYNDBLP4 NSK | 95 | 145 | 24 |
| 7019A5TYNDBLP4 NSK | 95 | 145 | 24 |