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/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Rescue methods for rolling bearing ring ferrules Rescue method for unqualified products of rolling bearing rings
Ways to rescue rolling bearing ring ferrules: /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Extra-large bearings are not the same as small bearings; they are classified into single-machine, single-person, single-piece processing; they are extremely random; they are easy to form the scale of public service or shape public service; if the grinding amount is small after machining, the heat treatment deformation is super Poor, shortened too large and shortened unevenness, carburized padding and transfer bumps, etc. If processed according to the normal process; these parts will become unqualified products. After analysis; some unqualified products can adopt methods to rescue.
1 Intermediate offset method 1.1 The rescue of the inner and outer diameters of the bearing ring is mainly for the precise measurement of the shortcomings (asymmetric type) of the parts; the minimum grinding amount is calculated (to the scale error of the product) Grinding) M; then intermediate offset of the part during grinding (shifting in the direction of increasing the amount of wear at the defect); the maximum offset is M/2; that is, the relative amount of wear is relatively increased ; point grinding.
1.2 The grounding of the rescue bearing ring of the inner and outer races of the ferrule is drawn to the inner diameter or outer diameter; that is, the grinding of the inner (outer) diameter is followed by grinding the raceway; taking the inner ring as an example; When there is a disadvantage of the asymmetry type, it is necessary to accurately measure the inner diameter dimension of the part; and calculate the maximum grinding amount M and the maximum grinding amount M1 at the inner raceway defect. When M1 < M; The middle offset of the circle; the maximum offset is M1/2; that is, when the inner diameter is processed, the amount of grinding is added to the inner raceway defect first; then the inner raceway is ground; the disadvantage is that the point is ground; Can be rescued. When M1 ≥ M; normal grinding can not be ground; depending on the situation, you can use the method described in Section 1.
Grinding with intermediate offset method is carried out under the premise of ensuring the hardness of the part and the depth of the carburized layer; the total offset cannot be completed in one offset grinding; usually the grinding is repeated several times; that is, after the offset test Grinding - measuring - adjusting the offset - repeating the repetitive process to complete the test; after the defects are worn away; correcting from scratch; normal grinding to correct the ellipticity. This method has lower power; The technical level; but in the single machine, single-piece production, this method is used to save the success rate; no delay in production progress. After several years of theoretical verification.
2 Chemical accumulation method refers to the bearing parts of the scale public service beyond the standard; the chemical accumulation method can be used for rescue. The principle of chemical accumulation is the chemical reaction between various chemical materials; the metal coating with a certain thickness is uniformly formed on the surface of the part; After the additional tempering, the metal layer and the original hardness and mechanical properties of the part are the same. The chemical accumulation only adds the size of the part. The sorcerer’s sorcerer’s sorcerer’s sorrow and sorrow Zhong Xing У У ç‚€ ç‚€ ÇŽ ÇŽ ÇŽ 蛔畲蟮ケå±ç²±ç©¸ç“¤ 蛔畲蟮ケå±ç²±ç©¸ç“¤ 0 0 0 0 0 0 0 0 0.
3 Heat treatment of the uplift method The quenching arrangement of the bearing steel consists of quenched martensite, a small amount of undissolved secondary carbide and approximately 12% to 14% of retained austenite. The quenched martensite and the remaining austenite are not Stable arrangement; the differentiation of martensite in the tempering process shortens the volume of steel; and the differentiation of the remaining austenite causes the volume of steel to swell.
Following the progress of the tempering temperature; the amount of residual austenite transformation and differentiation is increased; under the condition of ensuring the hardness of the process demand; the tempering temperature is appropriately improved; the remaining austenite is differentiated; and the martensite arrangement with larger specific volume is transformed. The workpiece volume can be increased correspondingly; that is, the outer diameter grinding amount can be added; using this method can make the bearing ferrule defect in the normal grinding condition to be scrapped parts can be rescued.
This method is more effective for thick and heavy workpieces with a large residual austenite content (especially for spherical roller bearings). In practice, parts with different standards, different scales, and different thicknesses are formulated. The same tempering process; under the premise of ensuring hardness and deformation; making the arrangement full; generating large ups; correspondingly adding grinding; rescuing waste.
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Source: Bearing network time: 2017-09-20