CN112719777A - Waste supporting roller bushing regeneration process - Google Patents
Waste supporting roller bushing regeneration process Download PDFInfo
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- CN112719777A CN112719777A CN202011561144.6A CN202011561144A CN112719777A CN 112719777 A CN112719777 A CN 112719777A CN 202011561144 A CN202011561144 A CN 202011561144A CN 112719777 A CN112719777 A CN 112719777A
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- roller
- bushing
- sleeve
- supporting
- roll
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- 239000002699 waste material Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000011069 regeneration method Methods 0.000 title claims abstract description 19
- 230000008929 regeneration Effects 0.000 title claims abstract description 18
- 238000010791 quenching Methods 0.000 claims abstract description 24
- 230000000171 quenching effect Effects 0.000 claims abstract description 24
- 238000000227 grinding Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000005496 tempering Methods 0.000 claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000010959 steel Substances 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 230000007547 defect Effects 0.000 claims description 7
- 238000005242 forging Methods 0.000 claims description 6
- 230000006698 induction Effects 0.000 claims description 4
- 238000007670 refining Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 2
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910003294 NiMo Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000009974 thixotropic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a waste supporting roller bushing regeneration process which comprises the steps of recycling supporting roller shafting treatment, roller bushing processing and hot assembly, wherein the recycling roller treatment comprises waste roller flaw detection, rough turning, tempering, semi-finish turning, rough grinding and finish grinding, the roller bushing processing comprises roller bushing blanking, rough turning, tempering, semi-finish turning, quenching and finish boring, after the processed supporting roller shaft and the roller bushing are subjected to hot assembly, the roller surface reaches the standard of the process requirement through a grinding process, and the assembly surface is ground into a wave shape along the roller shaft during the finish grinding of the roller shaft. Through the mode, complete surface contact between the roller sleeve and the roller shaft is changed into incomplete surface contact during interference assembly, so that the elasticity of a contact position is improved, the risks of cracking and slipping of the roller sleeve and breakage of a roller neck after the roller sleeve is embedded in a product are reduced, the roller sleeve can be repeatedly utilized for many times, steel used for manufacturing a supporting roller is effectively saved, the service life of the roller is prolonged, and the production cost is reduced.
Description
Technical Field
The invention relates to the field of roller production, in particular to a waste back-up roller bushing regeneration process.
Background
The supporting roller is required to have high strength, rigidity and enough toughness as a whole, the roller body is required to have high strength, hardness and wear resistance, and the thickness of a working layer is required to be more than 30mm conventionally. Such rolls are basically made of steels such as 70Cr3Mo, 70Cr3 NiMo. The steel ingot is processed by forging, annealing, tempering, roll body surface quenching or differential temperature quenching. The roller is normally scrapped when the effective quenching depth is reached or the mill adjusting range limit is reached. The effective use diameter of the large-diameter support roller is within 100mm, the small-diameter support roller is about 50mm, the support rollers are generally large, the diameter of the support roller is 650-1500 mm, the weight of the support roller is 2-30 tons, and compared with the utilization rate of the support roller when the support roller is scrapped, the whole effective utilization rate is quite low. In order to solve the problem, two regeneration methods of the waste supporting roller are mainly used, one is a roller body surfacing method, and the other is a large-to-small method and an embedding method. Because the surfacing method has high cost, low production efficiency, uneven hardness and poorer use effect, manufacturers applying the method are fewer and fewer at present. The loss of the greatly-modified small steel is too much, the surface forging high-quality layer is basically turned, the core structure is poor, the performance is not good after modification, the size matching is quite difficult, and the economic value is not high. At present, the most common method is the sleeve embedding method, and the sleeve embedding method has higher technical requirements on manufacturing: firstly, the roller sleeve is difficult to heat treat. And secondly, controlling the assembly interference magnitude. Thirdly, controlling the quality of the original roller blank. If the control is not good, quality problems such as cracking of the roller sleeve, slipping of the roller sleeve, breakage of the roller neck and the like can be caused.
Disclosure of Invention
The invention mainly solves the technical problem of providing a sleeve inlaying regeneration process of a supporting roller, which can improve the regeneration quality of the supporting roller and reduce the problems of cracking, slipping and the like of a roller sleeve.
In order to solve the technical problems, the invention adopts a technical scheme that: the waste supporting roller bushing regeneration process comprises the following steps:
selecting waste supporting rollers with corresponding specifications according to production requirements, and determining whether the outer surface defect depth of the waste supporting rollers and the supporting rollers have defects or not through ultrasonic flaw detection and surface dye-sensitized flaw detection, and whether the use standards can be met or not;
step two, rough turning the old roller with qualified flaw detection to basically form the roller shaft, and then determining whether the hardening layer of the old roller shaft has allowance to carry out thermal refining;
step three, semi-finish turning and finish turning the rough-turned and formed roll shaft to obtain a roll shaft of the supporting roll, the axis of the outer circle of which is superposed with the axis of the original supporting roll, measuring the inner diameter of a matched roll sleeve, and finely grinding the roll shaft according to the matched size to enable the roll shaft surface to undulate in a wave shape along the direction of the roll shaft;
selecting proper steel materials according to the materials of the waste supporting rolls to perform blanking forging on a roll sleeve blank, then performing rough turning and tempering on the roll surface of the roll sleeve according to the specification of the supporting roll to be processed, performing semi-finish turning on the outer circle after tempering, hardening the roll surface through quenching, and finally performing finish boring on an inner hole after determining the inner diameter size of the roll sleeve according to the roll shaft data of the supporting roll obtained in the third step, wherein the inner hole is in interference fit with the roll shaft;
putting the roller sleeve into a heating furnace for heating, and measuring the diameter of an inner hole of the roller sleeve at regular time until the inner diameter of the roller sleeve is 2mm larger than the excircle of the assembly surface of the roller shaft, and then installing the roller shaft of the supporting roller into the roller sleeve to slowly cool to normal temperature to complete sleeve embedding;
and step six, carrying out coarse grinding and fine grinding on the roll surface, and finishing the whole regenerated support roll to reach the factory standard.
In a preferred embodiment of the invention, the matching relationship between the roller sleeve and the supporting roller is that the thickness of the roller sleeve is 1/10-1/8 of the diameter of the supporting roller.
In a preferred embodiment of the invention, after rough turning in the second step, flaw detection needs to be performed on the roller shaft to check whether the position of the flaw is completely removed.
In a preferred embodiment of the invention, the height difference between the wave crests and the wave troughs of the roll shaft surface undulated in a wave shape after the refining in the third step is not more than 3 filaments.
In a preferred embodiment of the present invention, the temperature of the hardening and tempering is 900 to 910 ℃.
In a preferred embodiment of the invention, the quenching mode of the roll surface in the fourth step is power frequency induction quenching, and the quenching temperature is 930 +/-10 ℃.
In a preferred embodiment of the invention, the quenching depth in the fourth step is 2/5-3/5 of the thickness of the roller sleeve.
In a preferred embodiment of the present invention, the interference fit is 0.05% to 0.1%.
In a preferred embodiment of the invention, the assembly in the fifth step is vertical assembly, that is, the roller sleeve is vertically placed, and then the processed roller shaft is hoisted by the hoist and then vertically placed into the roller sleeve.
In a preferred embodiment of the invention, after the fifth step of embedding, the surface of the embedding sleeve is determined to be not damaged by ultrasonic flaw detection, and then rough grinding and finish grinding are carried out.
The invention has the beneficial effects that: the invention improves the prior waste supporting roller sleeve embedding technology, and finely grinds and renovates the surface of the roller shaft after finish turning to enable the roller shaft to be wavy, so that the contact between the roller sleeve and the roller shaft is in contact with thixotropic non-comprehensive contact from comprehensive to complete during sleeve embedding, the elasticity of the contact position is improved, the roller sleeve slip accident caused by longitudinal cracking and interference deficiency caused by transition fit is reduced, the regenerated quality of the waste supporting roller is improved, the waste supporting roller can be repeatedly utilized for many times, steel for manufacturing the supporting roller is effectively saved, the service life of the roller is prolonged, and the production cost is reduced. By adopting the method, the company repairs the supporting roller by more than 250 tons every year, saves the same amount of alloy steel for China, and generates economic benefit of 600 ten-thousand yuan every year.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1
The waste supporting roller with the original diameter of 1000mm is used as a raw material, and the supporting roller with the regeneration diameter of still 1000mm needs to be processed by the following steps:
firstly, determining the depth of the outer surface defect of the waste supporting roller and whether the supporting roller has defects or not through ultrasonic flaw detection and dye penetrant inspection, and whether the defect can reach the use standard or not;
the old roller with qualified flaw detection is roughly turned to enable the roller shaft to be basically molded, and due to the prototype modification, the thickness of the rough turning is small and generally does not exceed the tempering range of the original supporting roller, and the allowance is still left after the processing, so that the next step can be directly carried out without re-tempering;
thirdly, performing semi-finish turning, secondary flaw detection and finish turning on the rough-turned roller shaft in the second step to assemble an excircle to obtain a supporting roller shaft with the excircle axis coinciding with the original supporting roller axis, and performing finish grinding on the assembling surface of the roller shaft according to the matching size of the roller sleeve to enable the roller shaft surface to undulate in a wave shape along the roller shaft direction; the difference between the wave crest and the wave trough is 1-3 filaments, if the difference is too large, the matching precision of subsequent hot assembly can be influenced, if the difference is too small, the form of a contact surface cannot be influenced, and the problem of longitudinal cracking or the slip accident of the roller sleeve is still easy to generate;
selecting proper steel materials according to the materials of the waste supporting rolls to perform blanking forging on a roll sleeve blank, then roughly turning the roll sleeve according to the specification of the supporting roll to be processed, placing the blank in a heat treatment furnace to be heated to 900 ℃ for hardening and tempering after rough turning, then semi-finely turning an outer circle after hardening and hardening the roll surface in a power frequency induction heating mode, wherein the hardening temperature is 930 +/-10 ℃, finally finely boring an inner hole after determining the inner diameter size of the roll sleeve according to the roll shaft data of the supporting roll obtained in the third step, wherein the inner hole is in interference fit with the roll shaft, and the interference magnitude in interference fit is 0.60 mm;
step five, putting the roller sleeve into an oven for heating, measuring the diameter of an inner hole of the roller sleeve at regular time, opening the oven door of the oven when the inner diameter of the roller sleeve is larger than 2mm of the excircle, hoisting the processed roller shaft by using a hoisting machine, vertically putting the roller sleeve into the roller sleeve to complete sleeve embedding action, then, after the whole body is slowly cooled to the normal temperature, determining whether the surface of the roller sleeve is damaged by ultrasonic flaw detection, and if the surface of the roller sleeve is not damaged, entering the next procedure;
and step six, performing coarse grinding and fine grinding on the roll surface, and finishing the whole body of the roll body and the roll neck of the regenerated support roll to reach the delivery standard.
The thickness of the roller sleeve is 120mm, the adjusting range of the roller sleeve is about 4 times of the adjusting range of the supporting roller, if the roller sleeve is too thick, the roller shaft is easy to slip in the rotating process, and if the roller sleeve is too thin, a transition layer is easy to thin and crack due to large quenching depth in use. The quenching depth of the roller sleeve is 50-55 mm, the quenching depth exceeds the thickness of an effective working layer of the supporting roller, namely the quenching depth exceeds the adjustable range distance of the working roller, and otherwise the supporting roller is scrapped in advance.
Example 2
The method comprises the following steps of (1) reforming a waste supporting roller with a larger damage degree and a diameter of 1000mm into a supporting roller with a diameter of 800mm by using the waste supporting roller as a raw material:
step one, measuring the old roller, and confirming that the drawing conforms to the remanufacturing condition. Carrying out ultrasonic flaw detection and dye penetrant flaw detection on the old roller, and determining that the old roller has no defects and can reach the use standard;
step two, roughly turning the old roller qualified for flaw detection to basically form the roller shaft, wherein the roller shaft is required to be subjected to quenching and tempering treatment at the quenching and tempering temperature of 910 ℃ because the large-diameter supporting roller is changed into the small-diameter supporting roller, so that the thickness removed during rough turning is large, and the quenching and tempering position of the original roller is basically removed by turning;
thirdly, performing integral semi-finish turning on the rough turning roller shaft after tempering in the second step, and performing flaw detection again; finely turning the assembled excircle to obtain a supporting roller shaft with the excircle axis coinciding with the original supporting roller axis, and finely grinding the assembling surface of the roller shaft according to the matching size of the roller sleeve to enable the roller shaft surface to undulate in a wave shape along the direction of the roller shaft; the difference between the wave crest and the wave trough is 1-3 filaments, if the difference is too large, the matching precision of subsequent hot assembly can be influenced, if the difference is too small, the form of a contact surface can be influenced, and the problem of longitudinal cracking or the slip accident of the roller sleeve can still be easily caused;
selecting proper steel materials according to the materials of the waste supporting rolls to perform blanking forging on a roll sleeve blank, then roughly turning the roll sleeve according to the specification of the supporting roll to be processed, placing the blank in a heat treatment furnace to heat to 910 ℃ for hardening and tempering after rough turning, then semi-finely turning an outer circle after hardening and hardening the roll surface in a power frequency induction heating mode, wherein the hardening temperature is 920 +/-10 ℃, finally finely boring an inner hole after determining the inner diameter size of the roll sleeve according to the roll shaft data of the supporting roll obtained in the third step, wherein the inner hole is in interference fit with the roll shaft, and the interference magnitude in interference fit is 0.55 mm;
fifthly, placing the roller sleeve into a well-type heating furnace for heating, measuring the diameter of an inner hole of the roller sleeve at regular time, opening a furnace door of the well-type heating furnace when the inner diameter of the roller sleeve is larger than 2mm of the excircle, hoisting the processed roller shaft by using a hoisting machine, and vertically placing the roller sleeve into the roller sleeve to complete sleeve embedding;
and step six, performing coarse grinding and fine grinding on the roll surface, and finishing the whole body of the roll body and the roll neck of the regenerated support roll to reach the delivery standard.
The thickness of the roller sleeve is 100mm, the quenching depth is 40-50 mm, the minimum diameter of the roller sleeve can be phi 740, the unilateral effective thickness is 30mm, the quenching depth exceeds the unilateral effective thickness, the use requirement of a new roller can be met, and the problem of early scrapping cannot be caused.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The waste supporting roller bushing regeneration process is characterized by comprising the following steps of:
selecting waste supporting rollers with corresponding specifications according to production requirements, and determining whether the waste supporting rollers have defects or not through ultrasonic flaw detection and dye penetrant flaw detection so as to determine whether the waste supporting rollers can reach the use standard or not;
step two, rough turning the old roller with qualified flaw detection to basically form the roller shaft, and then determining whether the hardening layer of the old roller shaft has allowance to carry out thermal refining;
step three, obtaining a supporting roller shaft with the outer circle axis coincident with the original supporting roller axis through semi-finish turning, secondary flaw detection and finish turning assembly excircle, and carrying out finish grinding on a roller shaft assembly surface according to the matching size of the roller sleeve to enable the roller shaft surface to undulate in a wave shape along the roller shaft direction;
selecting proper steel materials according to the materials of the waste supporting rolls to perform blanking forging on a roll sleeve blank, then roughly turning and tempering the roll sleeve according to the specification of the supporting roll to be machined, semi-finely turning the outer circle after tempering, hardening the roll surface through quenching, and finally finely boring an inner hole after determining the inner diameter size of the roll sleeve according to the roll shaft data of the supporting roll obtained in the third step, wherein the inner hole and the roll shaft are in interference fit;
putting the roller sleeve into a heating furnace for heating, and measuring the diameter of an inner hole of the roller sleeve at regular time until the inner diameter of the roller sleeve is 2mm larger than the excircle of the assembly surface of the roller shaft, and then installing the roller shaft of the supporting roller into the roller sleeve to slowly cool to normal temperature to complete sleeve embedding;
and step six, carrying out coarse grinding and fine grinding on the roll surface, and finishing the whole regenerated support roll to reach the factory standard.
2. The waste supporting roller bushing regeneration process according to claim 1, wherein the matching relationship between the roller bushing and the supporting roller is that the thickness of the roller bushing is 1/10-1/8 of the diameter of the supporting roller.
3. The waste supporting roller bushing regeneration process according to claim 1, wherein flaw detection is performed on the roller shaft after rough turning in the second step, and whether the position of the flaw is completely removed is checked.
4. The waste supporting roller bushing regeneration process according to claim 1, wherein the height difference between the wave crests and the wave troughs of the wavy and undulated roller shaft surface after the fine grinding in the third step is not more than 3 filaments.
5. The waste supporting roller bushing regeneration process according to claim 1, wherein the temperature of quenching and tempering is 900-910 ℃.
6. The waste supporting roller bushing regeneration process according to claim 1, wherein the quenching hardening mode of the roller surfaces in the fourth step is power frequency induction quenching, and the quenching temperature is 930 +/-10 ℃.
7. The waste supporting roller bushing regeneration process according to claim 1, wherein the quenching depth in the fourth step is 2/5-3/5 of the thickness of the roller bushing.
8. The waste supporting roller bushing regeneration process according to claim 1, wherein the interference fit is 0.05% -0.1% of interference.
9. The waste supporting roller bushing regeneration process according to claim 1, wherein the assembly mode in the fifth step is vertical assembly, namely the roller bushing is vertically placed, and then the processed roller shaft is lifted by a crane and then vertically placed into the roller bushing.
10. The waste supporting roller bushing regeneration process according to claim 1, wherein after the bushing is completed in the fifth step, ultrasonic surface flaw detection is used for determining that the surface of the bushing is not damaged, and then rough grinding and fine grinding are carried out.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561144.6A CN112719777A (en) | 2020-12-25 | 2020-12-25 | Waste supporting roller bushing regeneration process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561144.6A CN112719777A (en) | 2020-12-25 | 2020-12-25 | Waste supporting roller bushing regeneration process |
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| CN112719777A true CN112719777A (en) | 2021-04-30 |
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| CN202011561144.6A Pending CN112719777A (en) | 2020-12-25 | 2020-12-25 | Waste supporting roller bushing regeneration process |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043644A (en) * | 1989-11-22 | 1990-07-11 | 东北重型机械学院秦皇岛分校 | Convexity controllable roll with special-shaped oil pocket |
| EP1215045A1 (en) * | 2000-12-14 | 2002-06-19 | Huber + Suhner Ag | Guide roller for pressing webs having an exchangeable sleeve |
| CN203018458U (en) * | 2012-12-30 | 2013-06-26 | 重庆川深金属新材料股份有限公司 | Spline type locking composite roll |
| CN106425275A (en) * | 2016-11-30 | 2017-02-22 | 马鞍山市恒强合金科技有限公司 | Repair method of cold-rolled support roller |
| CN106734214A (en) * | 2017-03-13 | 2017-05-31 | 太原科技大学 | A kind of composite (back-up) roll for rolling wave type ripple composite plate |
| CN108704941A (en) * | 2018-05-31 | 2018-10-26 | 泰尔重工股份有限公司 | A kind of novel bushing backing roll |
| CN109108569A (en) * | 2018-09-13 | 2019-01-01 | 李统帅 | A kind of waste and old backing roll insetting sleeve repair technique of milling train |
| CN109865982A (en) * | 2019-04-01 | 2019-06-11 | 洛阳工信机械设备研究所有限公司 | It is a kind of for the large and medium-sized completely new renovation technique for scrapping backing roll |
| CN211888419U (en) * | 2020-03-17 | 2020-11-10 | 无锡明昌轧辊有限公司 | Special forged steel hot roll for high-temperature-resistant non-ferrous alloy |
-
2020
- 2020-12-25 CN CN202011561144.6A patent/CN112719777A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043644A (en) * | 1989-11-22 | 1990-07-11 | 东北重型机械学院秦皇岛分校 | Convexity controllable roll with special-shaped oil pocket |
| EP1215045A1 (en) * | 2000-12-14 | 2002-06-19 | Huber + Suhner Ag | Guide roller for pressing webs having an exchangeable sleeve |
| CN203018458U (en) * | 2012-12-30 | 2013-06-26 | 重庆川深金属新材料股份有限公司 | Spline type locking composite roll |
| CN106425275A (en) * | 2016-11-30 | 2017-02-22 | 马鞍山市恒强合金科技有限公司 | Repair method of cold-rolled support roller |
| CN106734214A (en) * | 2017-03-13 | 2017-05-31 | 太原科技大学 | A kind of composite (back-up) roll for rolling wave type ripple composite plate |
| CN108704941A (en) * | 2018-05-31 | 2018-10-26 | 泰尔重工股份有限公司 | A kind of novel bushing backing roll |
| CN109108569A (en) * | 2018-09-13 | 2019-01-01 | 李统帅 | A kind of waste and old backing roll insetting sleeve repair technique of milling train |
| CN109865982A (en) * | 2019-04-01 | 2019-06-11 | 洛阳工信机械设备研究所有限公司 | It is a kind of for the large and medium-sized completely new renovation technique for scrapping backing roll |
| CN211888419U (en) * | 2020-03-17 | 2020-11-10 | 无锡明昌轧辊有限公司 | Special forged steel hot roll for high-temperature-resistant non-ferrous alloy |
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Application publication date: 20210430 |
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