CN109731916B - Rolling mill bearing seat and manufacturing method thereof - Google Patents
Rolling mill bearing seat and manufacturing method thereof Download PDFInfo
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- CN109731916B CN109731916B CN201910175543.XA CN201910175543A CN109731916B CN 109731916 B CN109731916 B CN 109731916B CN 201910175543 A CN201910175543 A CN 201910175543A CN 109731916 B CN109731916 B CN 109731916B
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Abstract
The invention discloses a rolling mill bearing seat and a manufacturing method thereof, wherein the rolling mill bearing seat is forged and processed by high-quality alloy steel, the rolling mill bearing seat is arranged at two ends of a supporting roller which is arranged on a large rolling mill and has a symmetrical structure, sliding surfaces which are in contact with a housing of the rolling mill are provided with copper sliding plates, the precision G6, the surface roughness Ra1.6 and the cylindricity of a bearing hole are 0.03mm, the precision H8 and the surface roughness Ra3.2 of a matching hole of a bearing end cover are respectively provided with the surface roughness Ra1.6 of the sliding surfaces at two sides, the central symmetry degree of the bearing hole is 0.1mm, the flatness of the upper surface is 0.05mm, the verticality of the lower surface to the sliding surface is 0.2mm, two sliding surfaces are symmetrically provided with a positioning pin hole, the precision H7 and the surface roughness Ra1.6 of the positioning pin, the central symmetry degree of the bearing hole is 0.1 mm. The requirements of quick replacement and interchangeability of the supporting roller are met, the positioning is accurate, the cooling and lubricating effects are good, the precision is high, the faults of the roller are reduced, and the processing quality is ensured.
Description
Technical Field
The invention belongs to the field of metallurgical steel rolling machinery, and particularly relates to a rolling mill bearing pedestal and a manufacturing method thereof.
Background
The rolling mill bearing block is one of important parts of rolling equipment, is a direct bearer of roll load, and transmits rolling force to the rolling mill bearing block through a bearing, so that whether the structure of the rolling mill bearing block is reasonable, whether the precision meets the requirement or not has important influence on the service life of the bearing and the safe operation of the rolling mill. The bearing seat of the rolling mill has the advantages of large bearing load, complex structure, high precision requirement, long manufacturing period and easy deformation during processing, and is a subject of key research of many professional manufacturers.
For the existing rolling mill bearing seat, the local part is easy to damage due to unreasonable structure and uneven strength; some bearing holes are affected by residual stress in the machining and manufacturing process and are deformed in machining; the roll-over method is used for processing the positioning holes of the sliding surfaces at two sides, the position precision is insufficient, the space of the axes of the rolls is crossed, and the plate type precision of the product is influenced.
Disclosure of Invention
The invention aims to provide a rolling mill bearing block and a manufacturing method thereof, which meet the requirements of quick replacement and interchangeability of a supporting roller, have accurate positioning, good cooling and lubricating effects and high precision, reduce roller faults and ensure the processing quality.
The technical scheme adopted by the invention is as follows:
a rolling mill bearing block is forged and processed by high-quality alloy steel, is arranged at two ends of a supporting roller which is arranged on a large rolling mill and has a symmetrical structure, can be adjusted up and down along with a pressing oil cylinder, and is embedded in a rolling mill housing, and a sliding surface which is contacted with the rolling mill housing is provided with a copper sliding plate; on a bearing seat of a rolling mill, the precision G6, the surface roughness Ra1.6 and the cylindricity of a bearing hole are 0.03mm, the precision H8 and the surface roughness Ra3.2 of a matching hole of a bearing end cover are high, the surface roughness Ra1.6 of sliding surfaces on two sides is high, the central symmetry degree of the bearing hole is 0.1mm, the flatness of the upper surface is 0.05mm, the verticality of the lower surface to the sliding surfaces is 0.2mm, positioning pin holes are symmetrically arranged on the two sliding surfaces, the precision H7, the surface roughness Ra1.6, the central symmetry degree of the bearing hole is 0.1mm, and the central verticality of the bearing hole is 0.1mm, a centralized lubrication system is adopted, and the ratio of the hole depth of an oil inlet hole.
A method of manufacturing a rolling mill chock as described above, comprising the steps of:
s1, forging a blank: the forging ratio of the forge piece is more than or equal to 4, and the defects of inclusion, folding, cracks, scabs and white spots are avoided;
s2, rough machining: firstly, drawing holes and contour processing lines according to the principle of uniform allowance, then processing an outer contour surface according to a drawing line, reserving single-side processing allowance, finally using the processed surface as a reference, finding out the center of a bearing hole, referring to the drawing reference, processing the bearing hole, and reserving single-side processing allowance;
s3, hardening and tempering: heating and preserving heat, quickly cooling to a certain temperature through oil, carrying out isothermal heat preservation, then air cooling to room temperature, and keeping the hardening and tempering hardness at HB 265-295;
s4, ultrasonic flaw detection: allowing single phi 2 equivalent diameter defects to exist dispersedly, and repairing or removing when the phi 2 equivalent diameter defects exceed phi 2 equivalent diameter defects or phi 2 equivalent diameter defects are distributed intensively and exceed 3% of the total detection area;
s5, semi-finishing: firstly, processing an inner hole on a large vertical lathe, and then processing an outer contour surface on a numerical control boring machine;
s6, stress relief annealing: heating and preserving heat, slowly cooling along with the furnace to a certain temperature, discharging, and finally air cooling to room temperature;
s7, finishing: firstly, finely machining an inner hole on a large vertical lathe, finely machining an outer contour surface on a numerical control boring machine, and finally machining an oil inlet hole and an oil outlet hole on a deep hole machining machine;
s8, magnetic powder inspection of a bearing seat: the magnetic powder inspection method is adopted to inspect the crack condition of the inner hole and sliding surfaces at two sides of the bearing seat, the bearing seat is converted into a product for acceptance without damage, and the bearing seat is repaired if the crack exists;
and S9, after the bearing seat is qualified, oiling and warehousing.
In S3, heating to Ac1+50 to 100 ℃ or Ac3And keeping the temperature at 50-100 ℃ for 1h, rapidly cooling to 620 ℃ through oil liquid, keeping the temperature isothermal for 2.5h, then air-cooling to room temperature, and keeping the quenching and tempering hardness at HB 265-295.
In S5, when the inner hole is machined in the large-sized vertical lathe, the workpiece is axially clamped on the large-sized vertical lathe with the inner hole as a reference, the inner hole is aligned and machined, and a single-side machining allowance is left.
In S5, machining the outer contour surface on the numerically controlled boring machine:
1) firstly, vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole of the bearing seat along the Y-axis direction, processing the end face of the bearing seat on the same station, and reserving single-side processing allowance;
3) rotating the workpiece by 180 degrees, processing the other end face, and reserving single-side processing allowance;
4) rotating the workpiece by 90 degrees, processing sliding surfaces on two sides by taking the bearing hole as a reference, and reserving single-side processing allowance;
5) processing two sliding surface positioning pin holes on the station in the step 4) by taking the processed end surface in the step 2) as a reference, and reserving single-side processing allowance;
6) and (5) turning the workpiece to process an upper plane and a lower plane, and reserving single-side processing allowance.
In S6, during stress relief annealing, heating to 450-550 ℃ and preserving heat for 4 hours, then slowly cooling to 380 ℃ along with the furnace, discharging, and finally air cooling to room temperature.
In S7, when the inner hole is finely machined on the large vertical lathe, the inner hole is taken as a reference, a workpiece is axially clamped on the large vertical lathe, the inner hole is aligned and machined, a single-side machining allowance is reserved, and the inner hole of the bearing seat is finely ground and polished by a special grinding head to meet the precision requirement.
In S7, finishing the outer contour surface on the numerically controlled boring machine:
1) vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole along the Y-axis direction, and processing an end face on the same station to meet the size requirement;
3) rotating the workpiece for 180 degrees, correcting the precision of the rotating position of the workpiece by using a dial indicator, and processing the other end face;
4) rotating the workpiece by 90 degrees, correcting the rotating position precision of the workpiece by using a dial indicator, and processing sliding surfaces on two sides by taking a bearing hole as a reference to meet the size requirement;
5) processing two sliding surface positioning pin holes on the station in the step 4) by taking the processed end surface in the step 2) as a reference to meet the size requirement;
6) the workpiece is turned over to process the upper plane and the lower plane to meet the size requirement.
In S7, when the oil inlet and outlet holes are machined on the deep hole machining tool, the positions of the oil inlet and outlet holes are marked by platform scribe lines, and then the oil inlet and outlet holes are machined on the deep hole drill to meet the size requirement.
The invention has the beneficial effects that:
the supporting roll is of a symmetrical structure, spare part cost can be saved, the requirements on the size and the position degree of a bearing seat of the rolling mill can be met, the requirement on quick replacement of the supporting roll can be met, the positioning pin hole has an axial limiting effect on the installation of the supporting roll and ensures accurate axial positioning of the supporting roll, meanwhile, the requirements on the size and the position degree of the positioning pin hole can be met, the interchangeability requirement when the supporting roll is used can be met, and the cooling and lubricating effects of a bearing of the rolling mill can be guaranteed through the; the applicant researches and discovers that the main factors influencing the precision of the rolling mill bearing seat comprise bearing hole cylindricity, the central symmetry of two sliding surfaces facing the bearing hole, the parallelism of two longitudinal positioning pin holes and end surfaces and the symmetry between the two longitudinal positioning pin holes, so that the key factors are controlled emphatically, the precision of the rolling mill bearing seat is ensured, the rolling mill bearing seat runs stably and reliably, the faults of the roller are reduced, the service life of the bearing is prolonged, the yield and the operating rate of a unit are improved, and the equipment maintenance cost is reduced.
During manufacturing, the principle of 'rough surface fine hole and hole surface combination' is adopted, during rough machining, the hole is machined after the surface is machined, the precision of the bearing hole is preferentially ensured, during finish machining, the hole is machined before the surface is machined, each functional surface is machined by taking the hole as a reference, the position precision is ensured, the whole process adopts twice heat treatment, the performance of the bearing seat is improved, the machining deformation is solved, and the machining quality is ensured.
Drawings
FIG. 1 is a front view of the drawing sheet of the present invention.
Fig. 2 is a longitudinal sectional view of fig. 1.
Fig. 3 is a cross-sectional view taken at K-K in fig. 1.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in figures 1 to 3, a rolling mill bearing seat is formed by forging high-quality alloy steel, is arranged at two ends of a supporting roller with a symmetrical structure on a large rolling mill and can be adjusted up and down along with a pressing oil cylinder, and a copper sliding plate is arranged on a sliding surface which is embedded in a rolling mill housing and is in contact with the rolling mill housing; on a bearing seat of a rolling mill, the precision G6, the surface roughness Ra1.6 and the cylindricity of a bearing hole are 0.03mm, the precision H8 and the surface roughness Ra3.2 of a matching hole of a bearing end cover are high, the surface roughness Ra1.6 of sliding surfaces on two sides is high, the central symmetry degree of the bearing hole is 0.1mm, the flatness of the upper surface is 0.05mm, the verticality of the lower surface to the sliding surfaces is 0.2mm, positioning pin holes are symmetrically arranged on the two sliding surfaces, the precision H7, the surface roughness Ra1.6, the central symmetry degree of the bearing hole is 0.1mm, and the central verticality of the bearing hole is 0.1mm, a centralized lubrication system is adopted, and the ratio of the hole depth of an oil inlet hole.
The steps of manufacturing the rolling mill bearing seat are as follows:
s1, forging a blank;
the forging ratio of the forging is more than or equal to 4, and the defects of inclusion, folding, cracks, scabbing and white spots are avoided.
S2, rough machining;
firstly, marking out each hole and a contour processing line according to the principle of uniform allowance, then processing an outer contour surface according to marking out, reserving a single side 8mm processing allowance, finally, taking the processed surface as a reference, finding out the center of a bearing hole, referring to the marking out reference, processing the bearing hole, and reserving a single side 8mm processing allowance.
S3, hardening and tempering;
heating to Ac1+50 to 100 ℃ or Ac3And keeping the temperature at 50-100 ℃ for 1h, rapidly cooling to 620 ℃ through oil liquid, keeping the temperature isothermal for 2.5h, then air-cooling to room temperature, and keeping the quenching and tempering hardness at HB 265-295.
S4, ultrasonic flaw detection;
and (3) allowing single phi 2 equivalent diameter defects to exist in a dispersed manner, and performing repair or elimination treatment when the phi 2 equivalent diameter defects exceed phi 2 equivalent diameter defects or phi 2 equivalent diameter defects are distributed in a concentrated manner and exceed 3% of the total detection area.
S5, semi-finishing;
firstly, machining an inner hole on a large vertical lathe; and (3) clamping the workpiece on a large vertical lathe along the axial direction by taking the inner hole as a reference, aligning and processing the inner hole, and reserving a single-side machining allowance of 3 mm.
And then processing an outer contour surface on a numerical control boring machine:
1) firstly, vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole of the bearing seat along the Y-axis direction, processing the end face of the bearing seat on the same station, and reserving a single edge with 3mm processing allowance;
3) rotating the workpiece by 180 degrees, processing the other end face, and reserving a single edge with 3mm processing allowance;
4) rotating the workpiece by 90 degrees, processing sliding surfaces on two sides by taking the bearing hole as a reference, and reserving a single-side 3mm processing allowance;
5) processing two sliding surface positioning pin holes on the basis of the processed end surface of the step 2) on a station 4), and reserving a single-side machining allowance of 3 mm;
6) and (4) turning the upper plane and the lower plane of the workpiece to be processed, and reserving a single-side 3mm processing allowance.
S6, stress relief annealing;
heating to 450-550 ℃, preserving heat for 4 hours, slowly cooling to 380 ℃ along with the furnace, discharging, and finally air cooling to room temperature.
S7, fine machining;
firstly, finely machining an inner hole on a large vertical lathe; and (3) clamping a workpiece on a large vertical lathe along the axial direction by taking the inner hole as a reference, aligning and processing the inner hole, reserving a single edge of 0.6mm processing allowance, and precisely grinding and polishing the inner hole of the bearing seat by adopting a special grinding head to meet the precision requirement.
And then finish machining the outer contour surface on a numerical control boring machine:
1) vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole along the Y-axis direction, and processing an end face on the same station to meet the size requirement;
3) rotating the workpiece for 180 degrees, correcting the precision of the rotating position of the workpiece by using a dial indicator, and processing the other end face;
4) rotating the workpiece by 90 degrees, correcting the rotating position precision of the workpiece by using a dial indicator, and processing sliding surfaces on two sides by taking a bearing hole as a reference to meet the size requirement;
5) processing two sliding surface positioning pin holes on the station in the step 4) by taking the processed end surface in the step 2) as a reference to meet the size requirement;
6) the workpiece is turned over to process the upper plane and the lower plane to meet the size requirement.
Finally, machining an oil inlet and an oil outlet on a deep hole machining machine tool; the platform scribing marks the position of the oil inlet and outlet hole, and then the oil inlet and outlet hole is processed on the deep hole drill to meet the size requirement.
S8, magnetic powder inspection of the bearing pedestal;
and (3) checking the cracks of the inner hole and sliding surfaces at two sides of the bearing seat by a magnetic powder inspection method, converting the bearing seat into a product for acceptance without damage, and repairing and treating the cracks if the cracks exist.
And S9, after the bearing seat is qualified, oiling and warehousing.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.
Claims (6)
1. A manufacturing method of a rolling mill bearing seat is characterized in that: the rolling mill bearing seat is formed by forging high-quality alloy steel, is arranged at two ends of a supporting roller which is arranged on a large rolling mill and has a symmetrical structure, can be adjusted up and down along with a pressing oil cylinder, and is embedded in the rolling mill housing, and a sliding surface which is in contact with the rolling mill housing is provided with a copper sliding plate; on a bearing seat of a rolling mill, the precision G6, the surface roughness Ra1.6 and the cylindricity of a bearing hole are 0.03mm, the precision H8 and the surface roughness Ra3.2 of a matching hole of a bearing end cover are high, the surface roughness Ra1.6 of sliding surfaces on two sides is high, the central symmetry degree of the bearing hole is 0.1mm, the flatness of the upper surface is 0.05mm, the verticality of the lower surface to the sliding surfaces is 0.2mm, positioning pin holes are symmetrically arranged on the two sliding surfaces, the precision H7, the surface roughness Ra1.6, the central symmetry degree of the bearing hole is 0.1mm, and the central verticality of the bearing hole is 0.1mm, a centralized lubricating system is adopted, and the ratio of the hole depth of an oil inlet hole;
when in manufacturing, the method comprises the following steps,
s1, forging a blank: the forging ratio of the forge piece is more than or equal to 4, and the defects of inclusion, folding, cracks, scabs and white spots are avoided;
s2, rough machining: firstly, drawing holes and contour processing lines according to the principle of uniform allowance, then processing an outer contour surface according to a drawing line, reserving single-side processing allowance, finally using the processed surface as a reference, finding out the center of a bearing hole, referring to the drawing reference, processing the bearing hole, and reserving single-side processing allowance;
s3, hardening and tempering: heating and preserving heat, quickly cooling to a certain temperature through oil, carrying out isothermal heat preservation, then air cooling to room temperature, and keeping the hardening and tempering hardness at HB 265-295;
s4, ultrasonic flaw detection: allowing single phi 2 equivalent diameter defects to exist dispersedly, and repairing or removing when the phi 2 equivalent diameter defects exceed phi 2 equivalent diameter defects or phi 2 equivalent diameter defects are distributed intensively and exceed 3% of the total detection area;
s5, semi-finishing: firstly, processing an inner hole on a large vertical lathe, and then processing an outer contour surface on a numerical control boring machine;
s6, stress relief annealing: heating and preserving heat, slowly cooling along with the furnace to a certain temperature, discharging, and finally air cooling to room temperature;
s7, finishing: firstly, finely machining an inner hole on a large vertical lathe, finely machining an outer contour surface on a numerical control boring machine, and finally machining an oil inlet hole and an oil outlet hole on a deep hole machining machine;
s8, magnetic powder inspection of a bearing seat: the magnetic powder inspection method is adopted to inspect the crack condition of the inner hole and sliding surfaces at two sides of the bearing seat, the bearing seat is converted into a product for acceptance without damage, and the bearing seat is repaired if the crack exists;
s9, after the bearing seat is qualified, oiling and warehousing;
in S3, heating to Ac1+50 to 100 ℃ or Ac3Keeping the temperature at 50-100 ℃ for 1h, quickly cooling to 620 ℃ through oil liquid, keeping the temperature for 2.5h at constant temperature, then air-cooling to room temperature, and keeping the hardening and tempering hardness at HB 265-295;
in S6, during stress relief annealing, heating to 450-550 ℃ and preserving heat for 4 hours, then slowly cooling to 380 ℃ along with the furnace, discharging, and finally air cooling to room temperature.
2. A method of manufacturing a rolling mill chock according to claim 1, in which: in S5, when the inner hole is machined in the large-sized vertical lathe, the workpiece is axially clamped on the large-sized vertical lathe with the inner hole as a reference, the inner hole is aligned and machined, and a single-side machining allowance is left.
3. A method of manufacturing a rolling mill chock according to claim 1, in which: in S5, machining the outer contour surface on the numerically controlled boring machine:
1) firstly, vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole of the bearing seat along the Y-axis direction, processing the end face of the bearing seat on the same station, and reserving single-side processing allowance;
3) rotating the workpiece by 180 degrees, processing the other end face, and reserving single-side processing allowance;
4) rotating the workpiece by 90 degrees, processing sliding surfaces on two sides by taking the bearing hole as a reference, and reserving single-side processing allowance;
5) processing two sliding surface positioning pin holes on the station in the step 4) by taking the processed end surface in the step 2) as a reference, and reserving single-side processing allowance;
6) and (5) turning the workpiece to process an upper plane and a lower plane, and reserving single-side processing allowance.
4. A method of manufacturing a rolling mill chock according to claim 1, in which: in S7, when the inner hole is finely machined on the large vertical lathe, the inner hole is taken as a reference, a workpiece is axially clamped on the large vertical lathe, the inner hole is aligned and machined, a single-side machining allowance is reserved, and the inner hole of the bearing seat is finely ground and polished by a special grinding head to meet the precision requirement.
5. A method of manufacturing a rolling mill chock according to claim 1, in which: in S7, finishing the outer contour surface on the numerically controlled boring machine:
1) vertically clamping a bearing seat on a rotary worktable;
2) aligning an inner hole along the Y-axis direction, and processing an end face on the same station to meet the size requirement;
3) rotating the workpiece for 180 degrees, correcting the precision of the rotating position of the workpiece by using a dial indicator, and processing the other end face;
4) rotating the workpiece by 90 degrees, correcting the rotating position precision of the workpiece by using a dial indicator, and processing sliding surfaces on two sides by taking a bearing hole as a reference to meet the size requirement;
5) processing two sliding surface positioning pin holes on the station in the step 4) by taking the processed end surface in the step 2) as a reference to meet the size requirement;
6) the workpiece is turned over to process the upper plane and the lower plane to meet the size requirement.
6. A method of manufacturing a rolling mill chock according to claim 1, in which: in S7, when the oil inlet and outlet holes are machined on the deep hole machining tool, the positions of the oil inlet and outlet holes are marked by platform scribe lines, and then the oil inlet and outlet holes are machined on the deep hole drill to meet the size requirement.
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| CN111604647B (en) * | 2020-06-03 | 2022-04-01 | 中钢集团西安重机有限公司 | Processing and inspection method for roller system bearing block of cold rolling mill |
| CN111889717B (en) * | 2020-06-30 | 2021-12-10 | 成都飞机工业（集团）有限责任公司 | High-precision bearing mounting hole machining method based on three-coordinate machine tool |
| CN115319408B (en) * | 2022-07-27 | 2023-06-09 | 江阴市美托金属制品有限公司 | Processing technology of large cast iron bearing seat |
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| JP5640528B2 (en) * | 2010-07-29 | 2014-12-17 | 日本精工株式会社 | Rolling bearing |
| CN104148901A (en) * | 2014-08-17 | 2014-11-19 | 成都亨通兆业精密机械有限公司 | Bearing base production process capable of well reducing heat treatment defects |
| CN104148902A (en) * | 2014-08-17 | 2014-11-19 | 成都亨通兆业精密机械有限公司 | Machining method benefiting to hole boring quality and bearing base mechanical property |
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| 武钢一米七冷连轧机轴承座;乐山冶金机械轧辊厂;《特殊钢》;19870831(第4期);第82-83页 * |
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