CN102652960A

CN102652960A - Method for treating surface defects of rolling mill back-up roll bearing

Info

Publication number: CN102652960A
Application number: CN2011100550173A
Authority: CN
Inventors: 李岳锋
Original assignee: Ningbo Baoxin Stainless Steel Co Ltd
Current assignee: Ningbo Baoxin Stainless Steel Co Ltd
Priority date: 2011-03-02
Filing date: 2011-03-02
Publication date: 2012-09-05
Anticipated expiration: 2031-03-02
Also published as: CN102652960B

Abstract

The invention relates to a method for treating surface defects of a rolling mill back-up roll bearing. The method is characterized by comprising the following steps: (1) for serious galling and scratching defects of the bearing caused by accidents: firstly marking at the positions of the defects; grinding the defects bearing until the defects are all removed; after the defects of the bearing are removed, carrying out point hardness measurement on the original defect marks, wherein five-point measurement is adopted for hardness points, the hardness of three points in the five points are required to be more than HRC55, and if the hardness does not meet the requirement, the bearing is ground continuously until the requirement is met; in addition, grinding is carried out at two points with the hardness being lower than HRC 55, the depth is required to be 1-1.5 mm, and the diameter is less than or equal to 10 mm; (2) for a galling condition that strip breakage does not occur to the bearing surface, or small cracks occur to the local part of the bearing surface, polishing is carried out for the pit defects according to the defect positions. The treating method provided by the invention is simple and reasonable, and classification treatment of grinding or polishing is carried out for the bearings with different defects, therefore, the consumption cost of the bearing is reduced, and the bearing can be safely used on a unit.

Description

The processing method of milling train supporting roller bearing blemish

Technical field

The present invention relates to the applied technical field of milling train supporting roller bearing, be specially the processing method of 20 roller stainless steel milling train supporting roller bearing outer ring blemish.

Background technology

Supporting roller bearing has considerable status in 20 roller mill Stainless Steel Production, supporting roller bearing is carried out system and correct administering and maintaining is very important, not only can improve band steel quality, reduces generation of defects.Can reduce simultaneously the use cost of bearing greatly.

At first from use angle; Backing roll not only carries roll-force in the production of band steel; Simultaneously backing roll is participating in also playing considerable effect aspect the control of plate shape, and backing roll also has very big influence in roller system cooperates, and for reducing the strip surface quality problem benifit is arranged also.If there is not the management of thick management of the meat of backing roll and diameter, that is not accomplished yet to want to shut out high-quality band steel.

Secondly the supporting roller bearing maintenance difficulties is quite big; This mainly is that the environment facies of its work are when abominable; Not only to carry sizable alternate load; Also can run into the precipitate shock loading electric, that broken belt produced of jumping simultaneously, these accidents not only can produce very havoc to bearing surface, defectives such as steel bonding, plucking, scratch occur like the surface.Can exert an influence to the bearing inner race loading end simultaneously, peel off like bearing inner race.

Last supporting roller bearing spare part appropriate litigation fees is expensive, and milling train supporting roller bearing one cover also wants 800,000, and effective scope of application of bearing has only 2-3mm, if can carry out the management of science to bearing, can practice thrift a large amount of spare part expenses every year.

Summary of the invention

Technical problem to be solved by this invention provides a kind of processing method of milling train supporting roller bearing blemish of advantages of simple, and the defective that can occur bearing surface is effectively judged and handled, guarantees the safe handling of bearing.

The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of processing method of milling train supporting roller bearing blemish, it is characterized in that the order of severity according to bearing surface defect, and take grinding or polishing classification processing, specifically may further comprise the steps:

1) the serious plucking that causes because of cause of accident for bearing, abrasive defective, serious here plucking or scratch refer to the horizontal strip defective perpendicular to the bearing periphery that occurs at bearing surface:

Earlier in the fault location marked; The defective bearing is carried out grinding, all remove to defective; Behind the bearing defect place to go, hardness measurement is played at the place at former flaw labeling, and hardness is got ready and adopted 5 point measurements, requires the hardness of 3 points in 5 will reach more than the HRC55, as if undesirable bearing is proceeded grinding, till reaching requirement; In addition, polish, require degree of depth 1-1.5mm, diameter≤10mm for 2 points below the HRC55;

2) the plucking situation of broken belt accident do not occur for bearing surface, or local crackle pit is arranged, be meant the contact fatigue crackle that the indivedual positions of bearing surface occur here, its length on entire contact surface is less than 1/5 of total contact-making surface:

Then take polishing to handle to defective.

As improvement; The concrete steps that said hardness is got ready are: remove the width of both sides chamfering in the bearing width direction after, being divided into 5 equal portions to bearing surface, is that starting point is 1,2,3,4,5 in order with the bearing number of having one end; Measure 5 point hardnesses respectively, record hardness data.

Improve, qualified for hardness measurement in the said step 1), but obviously the zone of adularescent seal adopts 3 polishings to handle, the position is respectively in the two ends and the centre of white seal again.

At last, the specific requirement that polishing is handled said step 2) is:

1, B place pit: the total contact in B place contact-making surface length＜1/2 face length, and B place interface width can polish smaller or equal to 40mm, requires circumferencial direction and axially necessary arc transition.

2, A or C place pit: the maximum contact face length degree that A or C are ordered＜1/4 contact face length, and the interface width that A or C orders can polish smaller or equal to 40mm, require circumferencial direction with axially must arc transition, must be noted that simultaneously with the suitable of bearing chamfer position to connect.

3, A, C have pit: the total contact in maximum contact face length degree＜1/3 of (A point+C point) sum face length; And the interface width that A and C are ordered can be polished smaller or equal to 40mm; Require circumferencial direction and axially necessary round arc transition, must be noted that simultaneously with the suitable of chamfer site to connect.

4, all there is pit at A, B, C place: the total contact in maximum contact face length degree＜1/3 of (A point+C point+B point) sum face length, and the interface width that A and C point and B are ordered is smaller or equal to 40mm.Can polish, require circumferencial direction and axially necessary round arc transition, must be noted that simultaneously with the suitable of chamfer site to connect.

Compared with prior art; The invention has the advantages that: the classification processing of the bearing of different defectives being carried out grinding or polishing; And the principle of classification processing has been introduced bearing hardness management concept; Be not simple by grinding away blemish or be used as handling the means of defective bearing, but the principle of bond material characteristic, the mechanics of materials is carried out clear and definite location to the hardness of bearing through method of detection.The service life of adopting as far as possible little treating capacity to improve bearing simultaneously; Processing method advantages of simple of the present invention; Avoid bearing former thereby crack to cause and scrap unusually effectively, reduce the consuming cost of bearing, guarantee that bearing uses safely on unit because of accident etc.

Description of drawings

Fig. 1 is the galling defect figure that bearing surface occurs;

Fig. 2 is the pit defect figure that bearing surface need be polished;

Fig. 3 takes the defective bearing surface of ground to carry out the sketch map that hardness is got 5 five equilibriums ready;

Fig. 4 is that the pit of bearing surface polishing is judged sketch map.

The specific embodiment

Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.

Shown in Fig. 1-4, a kind of processing method of 20 roller stainless steel milling train supporting roller bearing blemish, bearing in use runs into the broken belt accident, and serious plucking phenomenon has appearred in supporting roller bearing.

After defective that phenomenon is described occurs among the figure, before grinding, range flags is carried out in the bearing defect position, purpose is after removing blemish, to carry out the aberration situation that this mark was got and observed to hardness ready to mark position.

Bearing surface continues grinding all to be removed up to the surface groove defective, carries out hardness measurement in mark then.It is following that concrete hardness is got method ready: remove the width of both sides chamfering in the bearing width direction after, being divided into 5 equal portions such as Fig. 3 to bearing surface, is that starting point is 1,2,3,4,5 in order with the bearing number of having one end, measures 5 point hardnesses respectively, record hardness data.

Hardness Control requires: the hardness of 3 points must allow 2 points below HRC55 in 5 more than HRC55, like the situation that can not satisfy above requirement bearing is proceeded grinding, meets above requirement up to measuring the hardness situation.

Further at 2 some polishings below the HRC55, degree of depth 1-1.5mm, diameter≤10mm.

Should adopt 3 polishings to handle for the zone (although qualified hardness) of obvious adularescent seal, specifically get two ends and the centre of position ready at the white seal.

As shown in Figure 2, the plucking situation of broken belt accident does not appear in bearing surface, or has the processing of polishing of local crackle to make bearing obtain continuing to use and do not influence service property (quality).Concrete criterion and processing method are following:

Like Fig. 4, the polishing of the defective of diverse location requires:

Processing method of the present invention provides a kind of judgement and processing standard that bearing surface is occurred after the defectives such as crackle, thereby can judge that very simply bearing is whether available or be used under what environment.Avoid supporting roller bearing because of reasons such as accidents effectively, the damage that bearing surface is caused.And then cause in follow-up use and crack or peel off, and then cause unusually and scrap.The high-quality that guarantees bearing uses, and reduces by 20 roller mill supporting roller bearing application technologies of the high flow rate phenomenon in the bearing use simultaneously.

Claims

1. the processing method of a milling train supporting roller bearing blemish is characterized in that the order of severity according to bearing surface defect, takes classification processing, specifically may further comprise the steps:

1) the serious plucking that causes because of cause of accident for bearing, abrasive defective are earlier in the fault location marked; The defective bearing is carried out grinding, all remove to defective; Behind the bearing defect place to go, hardness measurement is played at the place at former flaw labeling, and hardness is got ready and adopted 5 point measurements, requires the hardness of 3 points in 5 will reach more than the HRC55, as if undesirable bearing is proceeded grinding, till reaching requirement; In addition, polish, require degree of depth 1-1.5mm, diameter≤10mm for 2 points below the HRC55;

2) the plucking situation of broken belt accident do not occur for bearing surface, or local crackle is arranged, then take polishing to handle pit defect.

2. processing method according to claim 1; It is characterized in that the concrete steps that the hardness of said step 1) is got ready are: remove the width of both sides chamfering in the bearing width direction after; Be divided into 5 equal portions to bearing surface; With the bearing number of having one end is that starting point is 1,2,3,4,5 in order, measures 5 point hardnesses respectively, record hardness data.

3. processing method according to claim 1, it is qualified for hardness measurement to it is characterized in that in the said step 1), but obviously the zone of adularescent seal adopts 3 polishings to handle, and the position is respectively in the two ends and the centre of white seal.

4. processing method according to claim 1 is characterized in that said step 2) in polishing handle specific requirement and be:

1) B place pit: the total contact in B place contact-making surface length＜1/2 face length, and B place interface width can be polished smaller or equal to 40mm;

2) A or C place pit: the maximum contact face length degree that A or C are ordered＜1/4 contact face length, and the interface width that A or C are ordered can be polished smaller or equal to 40mm;

3) A, C have pit: the total contact in maximum contact face length degree＜1/3 of (A point+C point) sum face length, and the interface width that A and C are ordered can be polished smaller or equal to 40mm;

4) all there is pit at A, B, C place: the total contact in maximum contact face length degree＜1/3 of (A point+C point+B point) sum face length, and the interface width that A and C point and B are ordered can be polished smaller or equal to 40mm;

Simultaneously circumferencial direction with axially want arc transition, to suitable connect with the bearing chamfer position.