CN109454115B - Recycling method of bearing inner ring matched with scrapped supporting roller - Google Patents
Recycling method of bearing inner ring matched with scrapped supporting roller Download PDFInfo
- Publication number
- CN109454115B CN109454115B CN201811360286.9A CN201811360286A CN109454115B CN 109454115 B CN109454115 B CN 109454115B CN 201811360286 A CN201811360286 A CN 201811360286A CN 109454115 B CN109454115 B CN 109454115B
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- Prior art keywords
- inner ring
- bearing
- bearing inner
- scrapped
- supporting roller
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B28/00—Maintaining rolls or rolling equipment in effective condition
- B21B28/02—Maintaining rolls in effective condition, e.g. reconditioning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B31/00—Rolling stand structures; Mounting, adjusting, or interchanging rolls, roll mountings, or stand frames
- B21B31/07—Adaptation of roll neck bearings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses a method for recycling a bearing inner ring matched with a scrapped supporting roller, which comprises the steps of judging whether the bearing inner ring can be recycled or not, polishing, recycling, assembling and grinding; the processing method is a bearing baffle roll neck size enlarging method or a bearing inner ring inner hole surface chromium plating method. The bearing retainer roll neck size amplification method is characterized in that a bearing retainer roll neck size amplification method is designed according to a bearing retainer roll neck drawing design diameter D, a polished bearing inner ring inner hole diameter D and an initial design interference magnitude, and the calculation formula is as follows: x = D + -D; the method for plating chromium on the surface of the inner hole of the bearing inner ring is characterized in that the thickness T of the chromium plating layer of the inner hole of the bearing inner ring is designed according to the actual diameter M of the bearing retainer roll neck, the diameter d of the inner hole of the bearing inner ring after polishing and the initial design interference, and the calculation formula is as follows: t = d + -M. The method can realize the reutilization of the bearing inner ring matched with the scrapped supporting roller, and can maximize the resource utilization.
Description
Technical Field
The invention belongs to the technical field of supporting roller matching parts, and particularly relates to a method for recycling a bearing inner ring matched with a scrapped supporting roller.
Background
The supporting roll is an important part in a rolling mill, and the bearing inner ring is an important matching part of the supporting roll.
The supporting bearing inner ring of the supporting roller and the bearing retainer roller neck are assembled in an interference fit mode, and the bearing inner ring is guaranteed not to move in the circumferential direction and the axial direction in the rolling process. The bearing inner ring is made of carburized bearing steel and is processed and manufactured by a special heat treatment process, so that the inner surface and the outer surface of the bearing inner ring have high hardness and wear resistance, and the core has high toughness.
The supporting roller can peel off because of the roller body large tracts of land in the use, roller body hardness descends to scrapping hardness or uses to scrapping the size and scrapping, and the supporting bearing inner circle of partial supporting roller after scrapping still has good performance, because of bearing inner circle price is higher, if scrapping the processing with bearing inner circle and supporting roller together, will greatly increased steel mill's manufacturing cost to cause the waste of resource.
Disclosure of Invention
The invention aims to solve the problems and provides a method for recycling a bearing inner ring matched with a scrapped supporting roller.
The technical scheme for realizing the purpose of the invention is as follows: a method for recycling a bearing inner ring matched with a scrapped supporting roller comprises the steps of judging whether the bearing inner ring can be recycled or not, polishing, recycling, assembling and grinding.
Judging whether the bearing inner ring can be recycled or not means that the bearing inner ring can be recycled when the bearing inner ring matched with the scrapped supporting roller meets the following conditions: pits with the diameter exceeding 2mm or the depth exceeding 0.2mm do not exist on the outer peripheral surface of the bearing inner ring, surface wave and dye penetrant inspection detects that the outer peripheral surface and the inner bore surface of the bearing inner ring do not have defects, the hardness difference of the outer peripheral surface of the bearing inner ring is less than or equal to 8HSD, and the hardness difference of the inner bore surface of the bearing inner ring is less than or equal to 8 HSD.
The polishing treatment requires that the roughness Ra after polishing is less than 0.8 mu m, and the diameter difference of the peripheries of the inner rings of the bearings before and after polishing is less than or equal to 0.2 mm.
The recycling treatment method is a bearing retainer roll neck size enlarging method or a bearing inner ring inner hole surface chromium plating method.
The bearing retainer roll neck size enlarging method is characterized in that according to a bearing retainer roll neck drawing design diameter D, a polished bearing inner ring inner hole diameter D and an initial design interference, a bearing retainer roll neck size X is designed, and the calculation formula is as follows: x = D + -D.
The method for plating chromium on the surface of the inner hole of the bearing inner ring is characterized in that the thickness T of the chromium plating layer of the inner hole of the bearing inner ring is designed according to the actual diameter M of the bearing retainer roll neck, the diameter d of the inner hole of the bearing inner ring after polishing and the initial design interference, and the calculation formula is as follows: t = d + -M.
The units of D, d, X, M, T are mm.
The enlargement size X of the bearing baffle roll neck and the thickness T of the chromium coating of the inner hole of the bearing inner ring are required to be controlled below 0.45 mm.
The enlargement dimension X of the bearing retainer roll neck is preferably controlled to be 0.13-0.18 mm.
The thickness T of the chromium coating of the inner hole of the bearing inner ring is preferably controlled to be 0.12-0.20 mm.
The assembly is carried out by adopting an induction heater or a box furnace, the heating time is controlled to be 10-30 min, and the surface temperature is controlled to be not more than 120 ℃ in the heating process.
The invention has the following positive effects: the method can realize the reutilization of the bearing inner ring matched with the scrapped supporting roller, and can maximize the resource utilization.
Detailed Description
(example 1)
The recycling method of the bearing inner ring matched with the scrapped supporting roller in the embodiment comprises the following steps:
s1: and judging whether the bearing inner ring matched with the scrapped supporting roller can be reused or not.
The method specifically comprises the following steps: and (4) visually inspecting whether the outer peripheral surface of the bearing inner ring has pits or not, and carrying out size, hardness, surface wave and dye check on the bearing inner ring.
Wherein, the surface wave and dye check detection range is the outer circumference surface and the inner hole surface of the bearing inner ring; the size and hardness detection position comprises a position of any axial 3 point on the outer peripheral surface of the bearing inner ring and a position of any axial 3 point on the inner hole surface, wherein the positions of the 3 points are respectively 100mm away from the two end parts of the axial middle part and the axial distance.
When the bearing inner ring matched with the scrapped supporting roller meets the following conditions, the bearing inner ring can be judged to be reused: pits with the diameter of more than 2mm or the depth of more than 0.2mm do not exist on the outer peripheral surface, defects such as cracks and the like do not exist in surface wave and dye-sensitized flaw detection, the hardness difference of the outer peripheral surface is less than or equal to 8HSD, and the hardness difference of the inner hole surface is less than or equal to 8 HSD.
S2: and polishing the outer peripheral surface and the inner bore surface of the reusable bearing inner ring, wherein the roughness Ra of the polished bearing inner ring is required to be less than 0.8 mu m, and the diameter difference of the outer periphery of the bearing inner ring before and after polishing is less than or equal to 0.2 mm.
S3: and carrying out recycling treatment on the polished bearing inner ring.
The recycling method of this embodiment is a method for enlarging the size of the roll neck of the bearing stopper, and specifically includes the following steps:
designing a diameter D (unit is mm, the same below) according to a drawing of a bearing retainer roll neck, designing a large size X of the bearing retainer roll neck according to a diameter D of an inner hole of a polished bearing inner ring and an initial design interference magnitude, wherein the calculation formula is as follows: x = D + -D.
The specific value of the enlarged size X of the bearing retainer roll neck of the embodiment is 0.15 mm.
S4: and assembling the recycled bearing inner ring on a supporting roller.
And heating and assembling by adopting an induction heater or a box furnace, wherein the heating time is controlled to be 10-30 min, and the surface temperature is controlled to be not more than 120 ℃ in the heating process.
S5: and grinding to the size required by the drawing after assembly.
The drawing of the embodiment requires the dimension phi 847mm (-0.39-minus 0.44), and the finished product detection dimension phi 847mm (-0.39).
(example 2)
The recycling method of the bearing inner ring matched with the scrapped supporting roller in the embodiment comprises the following steps:
s1: the same as in example 1.
S2: the same as in example 1.
S3: and carrying out recycling treatment on the polished bearing inner ring.
The recycling method of the embodiment is a chromium plating method for the surface of the inner hole of the bearing inner ring, and specifically comprises the following steps:
designing the thickness T of the chromium plating layer of the inner hole of the bearing inner ring according to the actual diameter M of the bearing retainer roll neck, the diameter d of the inner hole of the polished bearing inner ring and the initial design interference magnitude, wherein the calculation formula is as follows: t = d + -M.
The thickness T of the chromium-plated layer of the bearing inner ring of the embodiment is specifically 0.18 mm.
S4: the same as in example 1.
S5: and grinding to the size required by the drawing after assembly.
The drawing of the embodiment requires the dimension phi 682mm (-0.320-0.375), and the finished product detection dimension phi 682mm (-0.365).
Claims (9)
1. A method for recycling a bearing inner ring matched with a scrapped supporting roller comprises the steps of judging whether the bearing inner ring can be recycled or not, polishing, recycling, assembling and grinding; the recycling treatment method is a bearing retainer roll neck size enlarging method or a bearing inner ring inner hole surface chromium plating method;
judging whether the bearing inner ring can be recycled or not means that the bearing inner ring can be recycled when the bearing inner ring matched with the scrapped supporting roller meets the following conditions: pits with the diameter exceeding 2mm or the depth exceeding 0.2mm do not exist on the outer peripheral surface of the bearing inner ring, surface wave and dye penetrant inspection detects that the outer peripheral surface and the inner bore surface of the bearing inner ring do not have defects, the hardness difference of the outer peripheral surface of the bearing inner ring is less than or equal to 8HSD, and the hardness difference of the inner bore surface of the bearing inner ring is less than or equal to 8 HSD.
2. The recycling method of the inner ring of the bearing matched with the scrapped supporting roller according to claim 1, which is characterized in that: the bearing retainer roll neck size enlarging method is characterized in that according to a bearing retainer roll neck drawing design diameter D, a polished bearing inner ring inner hole diameter D and an initial design interference, a bearing retainer roll neck size X is designed, and the calculation formula is as follows: x = D + -D.
3. The recycling method of the inner ring of the bearing matched with the scrapped supporting roller according to claim 2, which is characterized in that: the enlarged size X of the bearing retainer roll neck is required to be controlled below 0.45 mm.
4. The recycling method of the inner ring of the bearing matched with the scrapped supporting roller as claimed in claim 3, wherein the recycling method comprises the following steps: the enlarged size X of the bearing retainer roll neck is required to be controlled within 0.13-0.18 mm.
5. The recycling method of the inner ring of the bearing matched with the scrapped supporting roller according to claim 1, which is characterized in that: the method for plating chromium on the surface of the inner hole of the bearing inner ring is characterized in that the thickness T of the chromium plating layer of the inner hole of the bearing inner ring is designed according to the actual diameter M of the bearing retainer roll neck, the diameter d of the inner hole of the bearing inner ring after polishing and the initial design interference, and the calculation formula is as follows: t = d + -M.
6. The recycling method of the inner ring of the matched bearing of the scrapped supporting roller as claimed in claim 5, wherein the recycling method comprises the following steps: the thickness T of the chromium coating of the inner hole of the bearing inner ring is required to be controlled below 0.45 mm.
7. The recycling method of the inner ring of the matched bearing of the scrapped supporting roller as claimed in claim 6, wherein the recycling method comprises the following steps: the thickness T of the chromium coating of the inner hole of the bearing inner ring is required to be controlled to be 0.12-0.20 mm.
8. The recycling method of the inner ring of the matched bearing of the scrapped supporting roller according to any one of claims 1 to 7, which is characterized in that: the polishing treatment requires that the roughness Ra after polishing is less than 0.8 mu m, and the diameter difference of the peripheries of the inner rings of the bearings before and after polishing is less than or equal to 0.2 mm.
9. The recycling method of the inner ring of the matched bearing of the scrapped supporting roller according to any one of claims 1 to 7, which is characterized in that: the assembly is carried out by adopting an induction heater or a box furnace, the heating time is controlled to be 10-30 min, and the surface temperature is controlled to be not more than 120 ℃ in the heating process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360286.9A CN109454115B (en) | 2018-11-15 | 2018-11-15 | Recycling method of bearing inner ring matched with scrapped supporting roller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811360286.9A CN109454115B (en) | 2018-11-15 | 2018-11-15 | Recycling method of bearing inner ring matched with scrapped supporting roller |
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| Publication Number | Publication Date |
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| CN109454115A CN109454115A (en) | 2019-03-12 |
| CN109454115B true CN109454115B (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811360286.9A Active CN109454115B (en) | 2018-11-15 | 2018-11-15 | Recycling method of bearing inner ring matched with scrapped supporting roller |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110102958A (en) * | 2019-05-05 | 2019-08-09 | 宝钢湛江钢铁有限公司 | A kind of optimization method that waste and old bearing recycles |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1093632A (en) * | 1993-04-07 | 1994-10-19 | 鞍山钢铁公司 | The local repair method of tungsten gold cover of fluid friction bearing |
| US6085419A (en) * | 1999-06-04 | 2000-07-11 | Daimlerchrysler Corporation | Parts carrier bearing assembly repair method |
| CN1821426A (en) * | 2005-11-28 | 2006-08-23 | 马跃林 | Reviving waste product of bearing with inner and outer bearing ring over size |
| US7810239B2 (en) * | 2006-10-23 | 2010-10-12 | United Technologies Corporation | Engine mount bearing sleeve repair |
| CN102031519B (en) * | 2011-01-12 | 2012-01-11 | 唐山瑞兆激光技术机械修复有限公司 | Laser repair method for abraded centrifugal fan bearing block |
| CN103753100A (en) * | 2014-01-16 | 2014-04-30 | 瓮福（集团）有限责任公司 | Water pump bearing box bearing hole wear repair method |
| CN107150205A (en) * | 2017-03-28 | 2017-09-12 | 宝钢轧辊科技有限责任公司 | Method for scrapping large forged back -up roll circular regeneration |
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