CN115106357A - Method for prolonging service life of thick-wall sleeve of rolling mill - Google Patents
Method for prolonging service life of thick-wall sleeve of rolling mill Download PDFInfo
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- CN115106357A CN115106357A CN202210704587.9A CN202210704587A CN115106357A CN 115106357 A CN115106357 A CN 115106357A CN 202210704587 A CN202210704587 A CN 202210704587A CN 115106357 A CN115106357 A CN 115106357A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005096 rolling process Methods 0.000 title claims abstract description 22
- 238000003754 machining Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000005097 cold rolling Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/30—Destroying solid waste or transforming solid waste into something useful or harmless involving mechanical treatment
- B09B3/35—Shredding, crushing or cutting
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Abstract
The invention discloses a method for prolonging the service life of a thick-wall sleeve of a rolling mill, belongs to the technical field of cold rolling mill equipment, and solves the technical problem that the service life of the existing sleeve is limited. The method comprises the following steps: obtaining a sleeve which can be recycled; machining the inner wall of the sleeve until the inner diameters of the sleeve along the axial direction are the same; machining the outer wall of the sleeve until the outer diameters of the sleeve along the axial direction are the same; carrying out flaw detection test on the processed sleeve; and acquiring a sleeve qualified in flaw detection test, and knurling the outer wall of the sleeve. This application is retrieved the sleeve of deformation, can effectively promote telescopic life-span, reduces use cost.
Description
Technical Field
The invention belongs to the technical field of cold rolling mill equipment, and particularly relates to a method for prolonging the service life of a thick-wall sleeve of a rolling mill.
Background
Before the finished pass rolling of the thin-specification strip steel of the twenty-high roll mill, a sleeve is adopted for coiling, the use of the sleeve is one of basic conditions for preventing the inner ring of the strip steel from collapsing and coiling, and the sleeve is a foundation for improving the efficient production of the next working procedure. When the deformation of the sleeve causes the deviation of roundness, the quality defects of fold, wave shape and the like of the inner ring of the strip steel are easily caused, the sleeve is offline and replaced by a new sleeve, and the service life of the sleeve is limited.
Disclosure of Invention
The application aims at solving the technical problem that the service life of the existing sleeve is limited at least to a certain extent, and for the purpose, the application provides a method for prolonging the service life of the thick-wall sleeve of the rolling mill.
The technical scheme of the application is as follows:
a method for prolonging the service life of a thick-wall sleeve of a rolling mill comprises the following steps:
obtaining a sleeve which can be recycled;
machining the inner wall of the sleeve until the inner diameters of the sleeve along the axial direction of the sleeve are the same;
machining the outer wall of the sleeve until the outer diameters of the sleeve along the axial direction are the same;
carrying out flaw detection test on the processed sleeve;
and acquiring a sleeve qualified in flaw detection test, and knurling the outer wall of the sleeve.
In some embodiments, the step of obtaining a recoverable sleeve comprises:
and acquiring the maximum inner diameter value and the minimum outer diameter value of the sleeve to be recovered, and recovering the sleeve if the acquired maximum inner diameter value of the sleeve to be recovered is smaller than the target inner diameter value and the acquired minimum outer diameter value of the sleeve to be recovered is larger than the target outer diameter value.
In some embodiments, the maximum inner diameter value differs from the standard inner diameter value by no more than 1-3 mm.
In some embodiments, the minimum outer diameter value differs from the standard outer diameter value by no less than 28-32 mm.
In some embodiments, after the step of machining the inner wall of the sleeve is completed, the hardness HB of the inner surface of the sleeve is obtained, and only the sleeve with HB ≧ 183 is subjected to a flaw detection test.
In some embodiments, after the step of machining the inner wall of the sleeve and/or the outer wall of the sleeve is completed, a measured flatness of the outer wall of the sleeve and/or the inner wall is obtained, and if the measured flatness is not satisfactory, the inner wall of the sleeve and/or the outer wall of the sleeve is finished until the measured flatness is satisfactory.
In some embodiments, the sleeve after the knurling step is marked, with the same roller recovering a different mark each time.
In some embodiments, the hardness, roundness, and friction of the sleeve after the knurling step are obtained.
The embodiment of the application has at least the following beneficial effects:
according to the technical scheme, the method disclosed by the invention has the advantages that the deformed sleeves are selected and recovered, so that the recovered sleeves can be applied to a production line again, the service life of the sleeves in the machine is prolonged, the rejection rate of the sleeves is reduced, and the effects of reducing cost and improving efficiency are achieved; meanwhile, the rolling stability is improved, quality defects such as strip steel wrinkles and collapse coils are reduced, and the method has high practicability and universality.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic view of a sleeve of the background art to which the present application relates;
FIG. 2 shows a schematic flow chart of a method in an embodiment of the present application;
FIG. 3 shows a schematic view of a sleeve after completion of recovery in an embodiment of the present application;
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials
In the finished product pass rolling process of the twenty-high roll mill, high-tension coiling rolling is adopted; due to the long-term recycling of the sleeve, the roundness of the middle part and the two sides of the sleeve is different, namely the waist tightening phenomenon shown in figure 1. A section of unstable rolling stage exists after the deformation sleeve is replaced every time, and particularly in the starting stage of a finished product pass, the thickness, the tension and the like are easy to fluctuate at a low speed, so that the quality and the rolling stability of the strip steel are influenced.
FIG. 1 is a schematic view showing a structure of a sleeve for generating a lumbar tightening phenomenon in the background of the present application; FIG. 2 shows a schematic flow chart of a method in an embodiment of the present application; fig. 3 shows a schematic view of a sleeve after completion of recovery according to an embodiment of the present application.
The application is described below with reference to specific embodiments in conjunction with the following drawings:
as shown in fig. 2 and 3, the present embodiment provides a method for prolonging the service life of a thick-wall sleeve of a rolling mill, which comprises the following steps:
step 100: a sleeve is obtained that can be recovered.
Step 200: and machining the inner wall of the sleeve until the inner diameter of the sleeve along the axial direction of the sleeve is the same.
Step 300: and machining the outer wall of the sleeve until the outer diameter of the sleeve along the axial direction of the sleeve is the same.
Step 400: and carrying out flaw detection test on the processed sleeve.
Step 500: and acquiring a sleeve qualified in flaw detection test, and knurling the outer wall of the sleeve.
Namely, in the embodiment, the deformed sleeves are selected and recovered, so that the recovered sleeves can be applied to the production line again, the service life of the sleeves in the machine is prolonged, the rejection rate of the sleeves is reduced, and the effects of cost reduction and efficiency improvement are achieved; meanwhile, the rolling stability is improved, quality defects such as strip steel wrinkles and collapse coils are reduced, and the method has high practicability and universality.
The use of sleeves has specification limits whereby to select a recoverable sleeve from a plurality of sleeves after a production run, in particular the step of obtaining a recoverable sleeve comprises:
step 101: and acquiring the maximum inner diameter value and the minimum outer diameter value of the sleeve to be recovered, and recovering the sleeve if the acquired maximum inner diameter value of the sleeve to be recovered is smaller than the target inner diameter value and the acquired minimum outer diameter value of the sleeve to be recovered is larger than the target outer diameter value.
It can be understood that, to retrieve the sleeve, the sleeve surface of the line that needs to be put off is processed to make the sleeve of retrieving accord with the service standard again, to the deformation of sleeve, cut down the processing to the sleeve through step 200-step 300 in this embodiment, from this, in the process of selecting the sleeve that can be retrieved, need to guarantee that the thickness of sleeve is in certain interval within range, also can avoid the sleeve to retrieve the low possibility of damaged in the course of processing simultaneously, and finally guarantee the intensity of sleeve. Of course, further, for cracked sleeves, after measuring the crack depth, it is determined whether the sleeve meets the recycling criteria.
In general, the sleeve deformed and generated in the waisted shape has a maximum inner diameter greater than the standard inner diameter and two minimum outer diameters less than the standard outer diameter, and in this embodiment, in step 101, the maximum inner diameter is not greater than 1-3mm different from the standard inner diameter, for example, the difference may be 1.5mm, 2mm, and 2.5 mm. And the minimum outer diameter value differs from the standard outer diameter value by no less than 28-32mm, for example, the difference may be 28.5mm, 29mm, and 29.5 mm.
After step 200, step 201 is further included: and obtaining the hardness HB of the inner surface of the sleeve, and only enabling the sleeve with the HB being more than or equal to 183 to enter a flaw detection test, so that the situation that the cost is saved and is less than the cost of recycling and processing the sleeve side due to the short service life of the sleeve with unqualified hardness after processing which is put into a production line is avoided.
Specifically, if the normal thick sleeve has the dimensions of inner diameter 508, outer diameter 650mm, weight 1.386t and hardness HB of 183 or more. The steps 200 and 300 should ensure that the inner diameter of the sleeve should be less than 510 + -1 mm and the outer diameter should be greater than 620 + -2 mm.
And as a coiling sleeve, the straightness of the sleeve is related to the coiling quality of the strip steel, so that after the step of machining the inner wall of the sleeve and/or the outer wall of the sleeve is completed, the measured straightness of the outer wall of the sleeve and/or the inner wall is obtained, and if the measured straightness does not meet the requirement, the inner wall of the sleeve and/or the outer wall of the sleeve is finely machined until the measured straightness meets the requirement.
The sequence of the steps 200 to 300 can be changed, after the processing is finished, flaw detection testing is carried out on the processed sleeve in the step 400, further, flaw detection testing can be carried out on the inner wall and the outer wall of the sleeve in a dye-sensitized flaw detection mode, and the sleeve with unrepairable marks on the surface is removed, so that the quality of the recovered sleeve is ensured; and for the sleeve which is qualified in the flaw detection test, knurling the outer wall of the sleeve in the step 500, increasing the friction with the surface of the strip steel during rolling, and avoiding the phenomenon of coiling and slipping.
After the step 500, a step 501 is further included to obtain the hardness, the roundness and the friction degree of the sleeve so as to judge whether the machined sleeve meets the use standard again, and the normal operation of the production line is prevented from being influenced.
The specific steps of machining the sleeve from step 200 to step 300 may include turning, boring, and coping, and the same sleeve may be recycled many times while maintaining high precision machining in the machining process, and thus, the present application further includes step 600: and marking the sleeve subjected to the knurling treatment step, wherein the marks recovered by the same roller every time are different. The mark is arranged on the end face of the sleeve, the mark can be a laser carving mark, the recovery times of the sleeve can be directly marked on the end face of the sleeve, different pigments can be used for spraying and marking, and different colors represent different recovery times of the sleeve. Through the sleeve to retrieving and processing completion mark, can help the operation personnel to judge fast and give the sleeve probability that can be retrieved once more, reduce operation intensity to a certain extent, reduce the process of measurement, promote the efficiency of retrieving.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise" indicate orientations or positional relationships that are based on the orientations or positional relationships illustrated in the figures, but are used for convenience in describing the present application and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus, are not to be considered limiting of the present application.
It should be noted that all the directional indications in the embodiments of the present application are only used to explain the relative position relationship, the motion situation, and the like between the components in a certain posture, and if the certain posture is changed, the directional indication is changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, descriptions in this application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope claimed in the present application.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: numerous changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A method for prolonging the service life of a thick-wall sleeve of a rolling mill is characterized by comprising the following steps:
obtaining a sleeve which can be recycled;
machining the inner wall of the sleeve until the inner diameters of the sleeve along the axial direction are the same;
machining the outer wall of the sleeve until the outer diameters of the sleeve along the axial direction of the sleeve are the same;
carrying out flaw detection test on the processed sleeve;
and acquiring a sleeve qualified in flaw detection test, and knurling the outer wall of the sleeve.
2. A method of extending mill thick-wall sleeve service life as claimed in claim 1 wherein said step of obtaining a sleeve that can be recycled includes:
and acquiring the maximum inner diameter value and the minimum outer diameter value of the sleeve to be recovered, and recovering the sleeve if the acquired maximum inner diameter value of the sleeve to be recovered is smaller than the target inner diameter value and the acquired minimum outer diameter value of the sleeve to be recovered is larger than the target outer diameter value.
3. A method of extending the useful life of rolling mill thick-walled sleeves as claimed in claim 1 wherein the difference between the maximum and standard inside diameter values is no greater than 1-3 mm.
4. A method of extending the useful life of rolling mill thick-walled sleeves as claimed in claim 1 wherein the difference between the minimum and standard outside diameter values is no less than 28-32 mm.
5. The method for prolonging the service life of a thick-walled sleeve of a rolling mill as claimed in claim 1, wherein after the step of machining the inner wall of the sleeve is completed, the hardness HB of the inner surface of the sleeve is obtained, and only the sleeve with HB ≥ 183 is subjected to flaw detection test.
6. A method of extending the useful life of a rolling mill thick-wall sleeve as claimed in claim 1, wherein after the step of machining the inner wall of the sleeve and/or the outer wall of the sleeve is completed, a measured flatness of the outer wall of the sleeve and/or the inner wall is obtained, and if the measured flatness is not satisfactory, the inner wall of the sleeve and/or the outer wall of the sleeve is finished until the measured flatness is satisfactory.
7. A method of extending the useful life of rolling mill thick-walled sleeves as claimed in claim 1 wherein the sleeves after the knurling step are marked with different marks each time they are retrieved by the same drum.
8. The method of extending the useful life of rolling mill thick-walled sleeves of claim 1, wherein the hardness, roundness and friction of the sleeve after the knurling step is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210704587.9A CN115106357A (en) | 2022-06-21 | 2022-06-21 | Method for prolonging service life of thick-wall sleeve of rolling mill |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210704587.9A CN115106357A (en) | 2022-06-21 | 2022-06-21 | Method for prolonging service life of thick-wall sleeve of rolling mill |
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| CN115106357A true CN115106357A (en) | 2022-09-27 |
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| CN202210704587.9A Pending CN115106357A (en) | 2022-06-21 | 2022-06-21 | Method for prolonging service life of thick-wall sleeve of rolling mill |
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