CN111545697B - Forging process of besides-star wheel - Google Patents
Forging process of besides-star wheel Download PDFInfo
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- CN111545697B CN111545697B CN202010399686.1A CN202010399686A CN111545697B CN 111545697 B CN111545697 B CN 111545697B CN 202010399686 A CN202010399686 A CN 202010399686A CN 111545697 B CN111545697 B CN 111545697B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J13/00—Details of machines for forging, pressing, or hammering
- B21J13/02—Dies or mountings therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/02—Die forging; Trimming by making use of special dies ; Punching during forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/28—Making machine elements wheels; discs
- B21K1/30—Making machine elements wheels; discs with gear-teeth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K29/00—Arrangements for heating or cooling during processing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/34—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tyres; for rims
Abstract
The invention discloses a forging process of an besides-star wheel, which relates to the technical field of forging processes and comprises the steps of blanking, heating, forming, thermal correction, sectional cooling and thermal treatment, wherein after the thermal treatment, the surface of a forge piece is subjected to cleaning and shot blasting treatment, then the forge piece is placed in a correction die of a friction press machine for cold correction, and finally, a finished product is inspected through a vernier caliper. The invention has the effect of improving the quality of the forging.
Description
Technical Field
The invention relates to the technical field of forging processes, in particular to a forging process of an outer star wheel.
Background
At present, the outer star wheel is a main stressed part of an automobile transmission shaft, the working condition is extremely complex, the performance of the outer star wheel directly influences the reliability and the safety of automobile transmission, bears complex stress of torsion and bending, additional stress generated and the like, and the outer star wheel is required to have enough fatigue strength and structural rigidity.
The traditional Chinese patent with publication number CN102989950A discloses a forging process for an automobile besides-star wheel, which comprises the steps of a sawing blanking process and a medium-frequency induction heating process, wherein the medium-frequency induction heating process is followed by a head and inlet upsetting process, a composite extrusion pre-forging process and a composite extrusion final forging process.
The above prior art solutions have the following drawbacks: after the planetary gear is forged, the forged piece is not completely cooled and formed, and needs to be taken out from die forging for heat treatment, shot blasting and other processes, and in each production process and conveying process, the forged piece can be bent or twisted and deformed, so that the quality of the forged piece is not high.
Disclosure of Invention
The invention aims to provide a forging process of an outer star wheel, which can improve the quality of a forged piece.
The technical purpose of the invention is realized by the following technical scheme:
the forging process of the outer star wheel comprises the following processing steps:
s1, blanking, namely cutting the blank into blanks with required length through a shearing machine;
s2, heating, namely heating the blank to the initial forging temperature which is 1100-1150 ℃, wherein the blank is heated by a medium-frequency induction heating furnace and is kept for 10 min;
s3, forming, mainly comprising an upsetting descaling stage, a hot extrusion forming stage, a finish forging forming stage and a hot trimming stage, forging and processing the blank into a forge piece by a single-point press, wherein the single-point press is provided with a forging die comprising a male die and a female die, the blank is placed in a die cavity of the female die of the single-point press, the blank generates plastic flow under the impact force of the male die on the single-point press, the die cavity is filled with the blank under the limitation of the die cavity to obtain a forge piece with the same shape as the forging die, and then burrs left on the surface of the forge piece are trimmed;
s4, thermal correction, namely, placing the forge piece in a correction die on a friction press in a thermal state for correction;
s5, cooling in sections, and cooling the forged workpiece in sections;
s6, carrying out heat treatment, and normalizing the forged piece;
s7, cleaning shot blasting, namely cleaning the surface of the forge piece through a crawler type shot blasting machine;
s8, cold correction, namely correcting in a correction die on the friction press;
and S9, checking, and checking the machined forged piece.
By adopting the technical scheme, the medium-frequency induction heating furnace has the advantages of high heating speed, high production efficiency, less oxidation and decarburization and material and forging die cost saving. The forging temperature is set between 1100-1150 ℃, so that the blank is not easy to generate the defect of overheating under the condition of improving the plasticity of the blank. Before forging, firstly, oxide skin on the surface of a blank is removed through upsetting, so that the oxide skin is not easy to adhere to the surface of a forging piece during forging, the quality of the forging piece is improved, and meanwhile, the abrasion to a forging die is reduced. The process of thermal correction is added, the forge piece is corrected, the forge piece is prevented from being bent or twisted and deformed in each production process and conveying process, and the shape and the precision of the forge piece are higher. The direct fog cooling easily causes uneven heating inside and outside the surface of the forging piece, and easily causes the phenomenon of cracking. The sectional cooling can reduce the internal stress caused by uneven internal and external temperature when the forging is cooled, and reduce the phenomenon of cracks on the surface of the forging. Normalizing is to refine metal grains and improve the mechanical properties of the metal. After normalizing, the surface of the forging is shot-blast cleaned, so that the quality of the surface of the forging is improved. In order to avoid the deformation of the forge piece in the trimming, punching and shot blasting processes, the plasticity of the forge piece is improved, cracks are prevented from being generated, cold correction is adopted to correct the forge piece, and the quality of the forge piece is further improved.
The present invention in a preferred example may be further configured to: in the step S5, the method comprises the step S501 of performing air cooling on the forge piece for 6-7min through a fan to finish a primary cooling stage;
s502, after primary cooling, performing a middle-section cooling stage on the forged piece, wherein spray cooling is performed by adopting a sprayer in the middle-section cooling stage, and the cooling time is 5-6 min;
and S503, after the middle section is cooled, the surface of the forging is subjected to air cooling for 3-4min by a fan, so that the rear section cooling stage is carried out.
Through adopting above-mentioned technical scheme, directly carry out the fog cold to the forging after forging, can make the inside and outside temperature difference of forging too big, because the forging expend with heat and contract with cold inhomogeneous and cause the internal stress, and air-cooled speed compares the fog cold very fast, falls to the uniform temperature through the forced air cooling, carries out the fog cold again, and after the fog cold, the coolant liquid can the adhesion on the forging surface, and the fog cold is combined and is forced air cooled once more, can take away the surface heat of forging fast for refrigerated speed.
The present invention in a preferred example may be further configured to: the cooling liquid in the sprayer is prepared by uniformly stirring the following raw materials in parts by weight: 4-6 parts of sulfuric acid, 5-8 parts of methacrylic acid, 4-6 parts of polyaluminum chloride, 3-6 parts of glycerol, 2-8 parts of sodium chloride, 15-20 parts of citric acid and 60-80 parts of water.
By adopting the technical scheme, the acidic substance and the active metal are combined for use, so that when the cooling liquid is sprayed onto the high-temperature forged piece, the forged piece can be cooled, oxide skin generated on the surface of the forged piece can be removed, and the quality of the workpiece is improved.
The present invention in a preferred example may be further configured to: the spraying pressure of the sprayer is 4-6 MPa; the wind speed of the primary cooling is 2-8 m/s; the wind speed of the rear section cooling is 4-6 m/s.
By adopting the technical scheme and adopting high-pressure spraying, the oxide skin on the surface of the forging piece can be effectively impacted, so that the oxide skin is easy to fall off; the forging is cooled at a low air speed during the initial cooling, so that the heat on the surface of the forging is gradually cooled, and the phenomenon of cracking caused by too large change of the internal and external temperatures is not easy to occur; in the cooling of the rear section, the temperature of the forge piece is reduced, the temperature difference between the inside and the surface of the forge piece is small, and the cold air can quickly take away the heat and the cooling liquid on the surface of the forge piece by increasing the air speed, so that the time for cooling the forge piece is shortened.
The present invention in a preferred example may be further configured to: the operating speed of the single-point press was set to 380 mm/s.
Through adopting above-mentioned technical scheme, the speed of press should not be too high, and the forging carries out heat-conducting time too short with mould and environment to and the work of deformation between terrace die and the forging converts into the temperature that heat energy can make the forging too high.
The present invention in a preferred example may be further configured to: in the step S2, preheating a forging die to 300 ℃ before heating the blank; the forging die is preheated by adopting a resistance furnace.
Through adopting above-mentioned technical scheme, preheat forging the mould, be difficult for taking away the heat on forging surface because the temperature of forging the mould crosses end in the forging process.
The present invention in a preferred example may be further configured to: the lubricant of the forging die adopts graphite powder; the granularity of the graphite powder is 325 meshes.
By adopting the technical scheme and using the lubricant, the defect that the temperature of the forged piece is too high to generate overheating or overburning due to frictional heat generation in the forging process is avoided. The graphite powder with 325 meshes has small granularity and good lubricating property, and is beneficial to filling the die cavity with the forge piece and demoulding the forge piece.
The present invention in a preferred example may be further configured to: after step S9, the forging die is immersed in brine using a saturated solution to cool.
Through adopting above-mentioned technical scheme, forging the forging back, because terrace die and forging direct contact, carry out the impact of a plurality of times at the terrace die to the forging and suppress the back, the terrace die can with the forging between produce the frictional heating, the temperature of forging is higher in addition, the continuous back of contacting of terrace die and forging, under heat-conducting effect, can make the temperature of terrace die rise, after forging, force the cooling to forging mould, avoid forging the mould because high temperature softens and early inefficacy.
In conclusion, the invention has the following beneficial effects:
1. in order to improve the plasticity of the forging and prevent cracks, the forging is corrected by adopting thermal correction and cold correction, so that the quality of the forging is further improved;
2. cooling to a certain temperature by air cooling, then carrying out fog cooling, wherein after the fog cooling, the cooling liquid can be adhered to the surface of the forging, and the fog cooling is combined with the air cooling again, so that the surface heat of the forging can be taken away quickly, and the cooling speed is accelerated;
3. the acidic substance and the active metal are combined for use, so that when the cooling liquid is sprayed onto the high-temperature forged piece, the forged piece can be cooled, oxide skin generated on the surface of the forged piece can be removed, and the quality of the workpiece is improved.
Drawings
FIG. 1 is a flow chart of the forging process of the present invention;
FIG. 2 is a detailed flow chart of the blank forming in the present invention;
FIG. 3 is a detailed flow chart of the sectional cooling of the forging of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a flowchart of a forging process of an outer star wheel in an embodiment of the present invention, fig. 2 is a flowchart of a blank forming in an embodiment of the present invention, fig. 3 is a flowchart of a forging piece sectional cooling in an embodiment of the present invention, and the following detailed description is provided by combining the specific steps of the forging process of the outer star wheel in fig. 1 to fig. 3:
s1, blanking, namely cutting the blank into blanks with required length through a shearing machine;
s2, heating, namely preheating the forging die to 300 ℃ by using a resistance furnace; heating the blank to the initial forging temperature of 1100-1150 ℃, wherein the intermediate frequency induction heating furnace is adopted for heating the blank and the heating time is kept for 10 min;
s3, forming, namely processing the heated blank;
s301, upsetting, namely upsetting the blank and removing oxide skin on the surface of the blank;
s302, hot extrusion forming; forging and processing the blank into a forge piece by a single-point press, wherein the single-point press is provided with a forging die which comprises a convex die and a concave die, the blank is placed in a die cavity of the concave die of the single-point press, the blank generates plastic flow under the impact force of the convex die on the single-point press, the die cavity is filled with the blank under the limitation of the die cavity to obtain the forge piece with the same shape as the forging die, and the working speed of the single-point press is set to 380 mm/s;
s303, in the final forging forming stage, punching and forging the forge piece, and forging the forge piece into a final shape;
s304, in the hot trimming stage, trimming the remaining burrs on the surface of the forged piece;
s4, thermal correction, namely, placing the forge piece in a correction die on a friction press in a thermal state for correction;
s5, cooling in sections, and cooling the forged workpiece in sections;
s501, performing air cooling on the forge piece for 6-7min through a fan at the air speed of 2-8m/S, preferably selecting the air cooling time of 7min and the air speed of 4m/S, and finishing a primary cooling stage;
s502, after primary cooling, carrying out a middle-section cooling stage on the forged piece, wherein a sprayer is adopted for spray cooling in the middle-section cooling stage, the cooling time is 5-6min, the spraying pressure of the sprayer is 4-6MPa, the spray cooling time is preferably 5min, and the spraying pressure is 5.5 MPa;
s503, after the middle section is cooled, the surface of the forging is subjected to air cooling for 3-4min by a fan, the air speed is 4-6m/S, the air cooling time is preferably 3min, and the air speed is 6m/S, so that the rear section cooling stage is carried out;
s6, performing heat treatment, normalizing the forged piece, refining the structure and eliminating stress;
s7, cleaning shot blasting, namely cleaning the surface of the forge piece through a crawler type shot blasting machine;
s8, cold correction, namely correcting in a correction die on the friction press;
s9, checking, namely checking the machined forged piece through a vernier caliper;
and S10, after the forge piece is machined, soaking the forging die in saline water of a saturated solution for cooling.
The lubricant of the forging die adopts graphite powder, the granularity of the graphite powder is 325 meshes, and the graphite powder has a good lubricating effect.
The cooling liquid in the sprayer is prepared by uniformly stirring the following raw materials in parts by weight: 4-6 parts of sulfuric acid, 4-6 parts of polyaluminum chloride, 3-6 parts of glycerol, 2-8 parts of sodium chloride, 5-11 parts of citric acid and 60-80 parts of water. The water is low-temperature water, so that a better cooling effect can be achieved. When the cooling liquid with the components is sprayed onto the high-temperature forging, the spraying pressure is high, the forging can be cooled, oxide skins generated on the surface of the forging can be removed, and the quality of the workpiece is further improved.
The weight parts of the sulfuric acid, methacrylic acid, polyaluminum chloride, glycerin, sodium chloride, citric acid and water components of the different components and the effects thereof are shown in table 1.
Table 1 oxidation rates of coolant compositions having different compositions when processing an outer star wheel forging are known from table 1, and when the coolant contains sodium chloride, citric acid and water, the effect of reducing the oxidation rate of the outer star wheel surface can be achieved when the forging is cooled by an atomizer. When sulfuric acid is added into the mixed solution of sodium chloride, citric acid and water, the oxidation rate of the surface of the outer star wheel is reduced; the oxidation rate of the surface of the planetary wheel is not obviously changed only by adding glycerin into the mixed solution of sodium chloride, citric acid and water; after polyaluminium chloride is continuously added into the mixed solution, the oxidation rate can be reduced; when sulfuric acid, polyaluminum chloride and glycerin are added simultaneously to a mixed solution of sodium chloride, citric acid and water, the effect of reducing the oxidation rate can be enhanced. When the sulfuric acid was 4.5 parts, the polyaluminum chloride was 5 parts, the glycerin was 4 parts, the sodium chloride was 5 parts, the citric acid was 5.5 parts, and the water was 76 parts, the cooling liquid using this composition achieved an effect that the generation rate of cracks was 0.05%. When the weight fractions of sulfuric acid, polyaluminium chloride, glycerol, sodium chloride, citric acid and water in the cooling liquid are in the following ranges, the oxidation rate of the surface of the outer star wheel is low, and the rejection rate can be effectively reduced:
4-6 parts of sulfuric acid;
4-6 parts of polyaluminum chloride;
3-6 parts of glycerol;
2-8 parts of sodium chloride;
5-11 parts of citric acid;
60-80 parts of water.
In the embodiment, in order to improve the product quality during forging, the die-entering angle of the male die is selected to be 150 °. When the die-entering angle is 150 degrees, the depression at the top of the blank is completely eliminated, and the effect of filling the die cavity is enhanced. The resistance of the material flowing downwards is increased, and the molding in the die cavity is more facilitated.
By adopting the forging process of the embodiment, the hot correction and the cold correction are added in the process, the forging can be prevented from being bent or twisted and deformed in each production process and the conveying process, the deformation of the forging in the processes of trimming, punching and shot blasting after the forging can be effectively prevented, and the quality of the forging can be greatly improved. In addition, the temperature of the surface of the forged piece is reduced through air cooling, fog cooling is performed again, cooling liquid can be adhered to the surface of the forged piece after the fog cooling, and the fog cooling is combined with the air cooling again, so that the surface heat of the forged piece can be taken away quickly, and the cooling speed is increased.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. A forging process of an outer star wheel is characterized in that: the method comprises the following processing steps:
s1, blanking, namely cutting the blank into blanks with required length through a shearing machine;
s2, heating, namely heating the blank to the initial forging temperature which is 1100-1150 ℃, wherein the blank is heated by a medium-frequency induction heating furnace and is kept for 10 min;
s3, forming, mainly comprising an upsetting descaling stage, a hot extrusion forming stage, a finish forging forming stage and a hot trimming stage, forging and processing the blank into a forge piece by a single-point press, wherein the single-point press is provided with a forging die comprising a male die and a female die, the blank is placed in a die cavity of the female die of the single-point press, the blank generates plastic flow under the impact force of the male die on the single-point press, the die cavity is filled with the blank under the limitation of the die cavity to obtain a forge piece with the same shape as the forging die, and then burrs left on the surface of the forge piece are trimmed;
s4, thermal correction, namely, placing the forge piece in a correction die on a friction press in a thermal state for correction;
s5, cooling in sections, and cooling the forged workpiece in sections;
s6, carrying out heat treatment, and normalizing the forged piece;
s7, cleaning shot blasting, namely cleaning the surface of the forge piece through a crawler type shot blasting machine;
s8, cold correction, namely correcting in a correction die on the friction press;
s9, checking, and checking the machined forged piece;
in the step S5, the method comprises the step S501 of performing air cooling on the forge piece for 6-7min through a fan to finish a primary cooling stage;
s502, after primary cooling, performing a middle-section cooling stage on the forged piece, wherein spray cooling is performed by adopting a sprayer in the middle-section cooling stage, and the cooling time is 5-6 min;
s503, after the middle section is cooled, the surface of the forging is subjected to air cooling for 3-4min by a fan, so that a rear section cooling stage is performed;
the cooling liquid in the sprayer is prepared by uniformly stirring the following raw materials in parts by weight: 4-6 parts of sulfuric acid, 5-8 parts of methacrylic acid, 4-6 parts of polyaluminum chloride, 3-6 parts of glycerol, 2-8 parts of sodium chloride, 15-18 parts of citric acid and 60-80 parts of water.
2. The process of forging an besides-star wheel as claimed in claim 1, wherein: the spraying pressure of the sprayer is 4-6 MPa; the wind speed of the primary cooling is 2-8 m/s; the wind speed of the rear section cooling is 4-6 m/s.
3. The process of forging an besides-star wheel as claimed in claim 1, wherein: the operating speed of the single-point press was set to 380 mm/s.
4. The process of forging an besides-star wheel as claimed in claim 1, wherein: in the step S2, preheating a forging die to 300 ℃ before heating the blank; the forging die is preheated by adopting a resistance furnace.
5. The process of forging an besides-star wheel as claimed in claim 1, wherein: the lubricant of the forging die adopts graphite powder; the granularity of the graphite powder is 325 meshes.
6. The process of forging an besides-star wheel as claimed in claim 1, wherein: after step S9, the forging die is immersed in brine using a saturated solution to cool.
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| CN202010399686.1A CN111545697B (en) | 2020-05-13 | 2020-05-13 | Forging process of besides-star wheel |
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| CN114309442B (en) * | 2021-11-16 | 2023-08-11 | 上海纳铁福传动系统有限公司 | Milling-free machining method for ball channel of inner star wheel of automobile universal joint |
| CN114505660A (en) * | 2022-03-15 | 2022-05-17 | 河北同锐机械制造有限公司 | Production process of high-wear-resistance toothed chain wheel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1704943A1 (en) * | 2005-03-23 | 2006-09-27 | Dr. Ing. h.c. F. Porsche Aktiengesellschaft | Process for the manufacture of a wheel disk body and wheel disk body for a vehicle |
| CN102989950A (en) * | 2011-09-19 | 2013-03-27 | 上海交大中京锻压有限公司 | Forging process of automotive besides-star wheel |
| CN108504830A (en) * | 2018-05-11 | 2018-09-07 | 浙江通特重型锻造有限公司 | A kind of plastic mould steel heat treatment process |
| CN110644005A (en) * | 2019-09-10 | 2020-01-03 | 徐州硕尔建材机械制造有限公司 | Maintenance repair agent for slewing bearing and preparation method thereof |
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2020
- 2020-05-13 CN CN202010399686.1A patent/CN111545697B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1704943A1 (en) * | 2005-03-23 | 2006-09-27 | Dr. Ing. h.c. F. Porsche Aktiengesellschaft | Process for the manufacture of a wheel disk body and wheel disk body for a vehicle |
| CN102989950A (en) * | 2011-09-19 | 2013-03-27 | 上海交大中京锻压有限公司 | Forging process of automotive besides-star wheel |
| CN108504830A (en) * | 2018-05-11 | 2018-09-07 | 浙江通特重型锻造有限公司 | A kind of plastic mould steel heat treatment process |
| CN110644005A (en) * | 2019-09-10 | 2020-01-03 | 徐州硕尔建材机械制造有限公司 | Maintenance repair agent for slewing bearing and preparation method thereof |
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