CN113755687B - Quenching heat treatment process for grinding ball production - Google Patents
Quenching heat treatment process for grinding ball production Download PDFInfo
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- CN113755687B CN113755687B CN202110818482.1A CN202110818482A CN113755687B CN 113755687 B CN113755687 B CN 113755687B CN 202110818482 A CN202110818482 A CN 202110818482A CN 113755687 B CN113755687 B CN 113755687B
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- polyvinylpyrrolidone
- polytetramethylene ether
- ether glycol
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- 238000010791 quenching Methods 0.000 title claims abstract description 156
- 230000000171 quenching effect Effects 0.000 title claims abstract description 148
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229920000909 polytetrahydrofuran Polymers 0.000 claims abstract description 63
- 239000007788 liquid Substances 0.000 claims abstract description 62
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims abstract description 59
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims abstract description 59
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims abstract description 59
- 238000001816 cooling Methods 0.000 claims abstract description 43
- 239000000203 mixture Substances 0.000 claims abstract description 36
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 26
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 16
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- IRAGEBXSFXWYNX-UHFFFAOYSA-N 2-(1,3,5-triazinan-1-yl)ethanol Chemical group OCCN1CNCNC1 IRAGEBXSFXWYNX-UHFFFAOYSA-N 0.000 claims description 8
- QDCPNGVVOWVKJG-VAWYXSNFSA-N 2-[(e)-dodec-1-enyl]butanedioic acid Chemical group CCCCCCCCCC\C=C\C(C(O)=O)CC(O)=O QDCPNGVVOWVKJG-VAWYXSNFSA-N 0.000 claims description 8
- RUPBZQFQVRMKDG-UHFFFAOYSA-M Didecyldimethylammonium chloride Chemical compound [Cl-].CCCCCCCCCC[N+](C)(C)CCCCCCCCCC RUPBZQFQVRMKDG-UHFFFAOYSA-M 0.000 claims description 8
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 8
- 239000012964 benzotriazole Substances 0.000 claims description 8
- 229960004670 didecyldimethylammonium chloride Drugs 0.000 claims description 8
- 230000000844 anti-bacterial effect Effects 0.000 claims description 4
- 239000013556 antirust agent Substances 0.000 claims description 4
- 239000003899 bactericide agent Substances 0.000 claims description 4
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 12
- 230000001351 cycling effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 14
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 6
- 229910052804 chromium Inorganic materials 0.000 description 4
- 239000011651 chromium Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 229910001037 White iron Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C21D9/36—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for balls; for rollers
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
- C21D1/60—Aqueous agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a quenching heat treatment process for grinding ball production, which comprises the following steps: quenching the workpiece to be treated in quenching liquid and then cooling in air; cycling the steps; the quenching liquid comprises a composition consisting of polytetramethylene ether glycol, polyvinyl alcohol and polyvinylpyrrolidone as raw materials; the polytetramethylene ether glycol is a mixture of polytetramethylene ether glycol with molecular weight of 5000-15000, polytetramethylene ether glycol with molecular weight of 3000-4500, and polytetramethylene ether glycol with molecular weight of 1000-2000; the polyvinylpyrrolidone is a mixture of polyvinylpyrrolidone with K value of 65-90, polyvinylpyrrolidone with K value of 45-60, and polyvinylpyrrolidone with K value of 15-30. The quenching heat treatment process for grinding ball production provided by the invention is safe and environment-friendly, and can ensure that grinding balls with different materials and different specifications can obtain ideal cooling curves, so that the obtained grinding balls have good performance.
Description
Technical Field
The invention relates to the technical field of heat treatment, in particular to a quenching heat treatment process for grinding ball production.
Background
At present, the domestic casting grinding balls which need quenching are mainly divided into two types, namely high-chromium white cast iron grinding balls and carbide-Containing Austempered Ductile Iron (CADI) grinding balls. The high-chromium cast iron grinding ball is a brittle material, has high alloy content and good hardenability, and requires smooth transition of a cooling curve during quenching, moderate cooling speed, and can generate the phenomena of cracking, excessive residual austenite and the like when the cooling speed is too high. At the present stage, quenching oil is mainly adopted for quenching. The CADI grinding ball is made of spheroidal graphite cast iron, has good toughness, low alloy content and poor hardenability, and is required to be cooled quickly at high temperature, otherwise pearlite transformation can occur, so that 'quench-proof' is caused, and cooling is slow at low temperature, otherwise, the difference of hardness between the surface and the core of the grinding ball is large, so that salt bath quenching is generally adopted. If one unit produces grinding balls made of the two materials at the same time, the quenching media are not uniform, quenching equipment cannot be shared, and cost and resource waste are caused; meanwhile, the requirements of the whole society on environmental protection, safety and occupational health are higher and higher, and quenching oil and quenching salt with high pollution and high risk are gradually eliminated, so that the adoption of the quenching medium and the quenching process can meet the requirements at the same time, and the technical problem to be solved is urgent at present.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a quenching heat treatment process for grinding ball production, which is safe and environment-friendly, and can ensure that grinding balls with different materials, such as high-chromium cast iron, austempered ductile iron and the like and different specifications can obtain ideal cooling curves, so that the obtained grinding balls have good performance.
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing the piece to be treated in quenching liquid for quenching, and then placing in air for cooling; the steps are circularly carried out;
wherein, the raw materials of the quenching liquid comprise a macromolecular composition composed of polytetramethylene ether glycol, polyvinyl alcohol and polyvinylpyrrolidone; the polytetramethylene ether glycol is a mixture of polytetramethylene ether glycol with a molecular weight of 5000-15000, polytetramethylene ether glycol with a molecular weight of 3000-4500 and polytetramethylene ether glycol with a molecular weight of 1000-2000; the polyvinylpyrrolidone is a mixture of polyvinylpyrrolidone with a K value of 65-90, polyvinylpyrrolidone with a K value of 45-60 and polyvinylpyrrolidone with a K value of 15-30.
Preferably, the weight ratio of the to-be-treated piece to the quenching liquid is 1:4-7; the temperature of the quenching liquid is 20-45 ℃.
Preferably, the above steps are performed cyclically n times, wherein n.gtoreq.2.
Preferably, 2.ltoreq.n.ltoreq.6.
Preferably, n=3.
Preferably, each time the material is cooled in air for 60-120s.
Preferably, the surface temperature of the piece to be treated entering the quenching liquid is 850-920 ℃.
Preferably, the termination temperature T of the first quenching in the quenching liquid 1 At 350-500 ℃, the termination temperature T of the nth quenching n 100-250deg.C, and T 1 ＞T 2 ＞…＞T n-1 ＞T n 。
Preferably, the termination temperature T of the first quenching 1 At 350-500 deg.C, the termination temperature T of the 2 nd quenching 2 250-350 ℃; termination temperature T of the 3 rd quench 3 100-250 ℃.
Preferably, the termination temperature T of the first quenching 1 At a temperature of 450 ℃, the termination temperature T of the 2 nd quenching 2 280 ℃; termination temperature T of the 3 rd quench 3 130 ℃.
Preferably, in the raw materials of the quenching liquid, the weight ratio of polytetramethylene ether glycol, polyvinyl alcohol and polyvinylpyrrolidone is 8-17:7-10:2-5.
Preferably, the weight ratio of the polytetramethylene ether glycol with the molecular weight of 5000-15000, the polytetramethylene ether glycol with the molecular weight of 3000-4500 and the polytetramethylene ether glycol with the molecular weight of 1000-2000 is 2-7:11-17:1.5-4; the weight ratio of the polyvinylpyrrolidone with the K value of 65-90 to the polyvinylpyrrolidone with the K value of 45-60 to the polyvinylpyrrolidone with the K value of 15-30 is 1-4:5-11:13-20.
Preferably, the polyvinyl alcohol is a polyvinyl alcohol having a molecular weight of 12000 to 16000.
Preferably, the quenching liquid comprises the following raw materials in parts by weight: 62-75 parts of high molecular composition, 2-15 parts of glycol, 1.8-2.9 parts of bactericide, 2.5-3.2 parts of antirust agent and 15-35 parts of water.
Preferably, the bactericide is hydroxyethyl hexahydro s-triazine and didecyl dimethyl ammonium chloride, and the weight ratio is 3-12: 1-5; the antirust agent is dodecenyl succinic acid and benzotriazole, and the weight ratio is 2-6: 7-15.
The molecular weight in the present invention is a number average molecular weight.
The quenching is a heat treatment process method for heating the casting to above a critical temperature at a proper speed, preserving heat for a period of time to fully austenitize, and then cooling at a cooling speed greater than the critical cooling speed to avoid the pearlite transformation area, thereby obtaining an unbalanced structure mainly comprising martensite or bainite. The cooling process is mainly divided into two time periods, namely a high-temperature area, the cooling speed is as fast as possible, and the pearlite transformation area is completely avoided; secondly, in the low temperature area, the cooling area has proper speed, so that not only the unbalanced structure with fine grains is obtained, but also the casting cannot be cracked due to the overlarge cooling speed. According to the quenching heat treatment process for grinding ball production, the adopted quenching cooling medium is specific quenching liquid and air, the quenching liquid is firstly prepared to a certain concentration according to the requirement, then the quenching temperature of the grinding ball in the quenching liquid is controlled, the grinding ball is placed in the air for cooling under a certain temperature condition, and the grinding balls with different materials and specifications are subjected to ideal cooling curve by using the quenching liquid-air alternative quenching cooling mode, so that ideal product performance is obtained; meanwhile, the process is safe and environment-friendly, can take into account the heat treatment of the high-chromium cast iron grinding balls and the CADI grinding balls, and can replace the existing quenching cooling method; the grinding ball obtained after heat treatment has high and uniform hardness, good hardenability and little deformation and cracking; the adopted quenching liquid is prepared from the main materials of polytetramethylene ether glycol with specific molecular weight, polyvinyl alcohol and polyvinylpyrrolidone with specific K value, and has the advantages of adjusting the viscosity of the system, ensuring excellent quenching liquid cooling parameters and cooling rate, meeting the requirements of heat treatment of different grinding balls, and ensuring good quality of the obtained grinding balls.
Detailed Description
The technical scheme of the invention is described in detail through specific embodiments.
Example 1
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing a piece to be treated with the surface temperature of 920 ℃ in quenching liquid with the temperature of 45 ℃ for primary quenching, wherein the termination temperature of the primary quenching is 350 ℃, then placing the piece in air for cooling for 70s, then placing the piece in quenching liquid with the temperature of 45 ℃ for secondary quenching, wherein the termination temperature of the secondary quenching is 250 ℃, and then placing the piece in air for cooling for 70s; wherein, in the quenching process, the weight ratio of the to-be-treated piece to the quenching liquid is 1:6, preparing a base material;
wherein, the raw materials of the quenching liquid comprise the following components in parts by weight: 24.8 parts of polytetramethylene ether glycol, 27.9 parts of polyvinyl alcohol, 9.3 parts of polyvinylpyrrolidone, 15 parts of ethylene glycol, 0.8 part of hydroxyethyl hexahydro s-triazine, 1 part of didecyl dimethyl ammonium chloride, 0.4 part of dodecenyl succinic acid, 2.8 parts of benzotriazole and 15 parts of water;
the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 12000, a polytetramethylene ether glycol with a molecular weight of 4500 and a polytetramethylene ether glycol with a molecular weight of 1000 according to a weight ratio of 2:17: 1.5; the polyvinyl alcohol is polyvinyl alcohol with molecular weight of 16000; the polyvinylpyrrolidone is 65K polyvinylpyrrolidone, 45K polyvinylpyrrolidone and 15K polyvinylpyrrolidone in weight ratio of 4:5: 17.
Example 2
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing the piece to be treated with the surface temperature of 890 ℃ in quenching liquid with the temperature of 20 ℃ for quenching once to 500 ℃, and then placing the piece to be treated in air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 20 ℃ for secondary quenching to 420 ℃, and then placing the mixture into air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 20 ℃ for three times to quench to 380 ℃, and then placing the mixture into air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 20 ℃ for four times to quench to 300 ℃, and then placing the mixture into air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 20 ℃ for five times to quench the mixture to the temperature of 200 ℃, and then placing the mixture into air to cool the mixture for 60 seconds; then placing the mixture in quenching liquid with the temperature of 20 ℃ for six times to quench the mixture to 100 ℃, and then placing the mixture in air to cool the mixture for 60 seconds; wherein, in the quenching process, the weight ratio of the to-be-treated piece to the quenching liquid is 1:4, a step of;
the quenching liquid comprises the following raw materials in parts by weight: 42 parts of polytetramethylene ether glycol, 21 parts of polyvinyl alcohol, 12 parts of polyvinylpyrrolidone, 2 parts of ethylene glycol, 2.4 parts of hydroxyethyl hexahydro s-triazine, 0.2 part of didecyl dimethyl ammonium chloride, 1.2 parts of dodecenyl succinic acid, 1.4 parts of benzotriazole and 35 parts of water;
the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 15000, a polytetramethylene ether glycol with a molecular weight of 3000 and a polytetramethylene ether glycol with a molecular weight of 2000 according to a weight ratio of 7:11:2, a mixture of two or more of the above-mentioned materials; the polyvinyl alcohol is polyvinyl alcohol with a molecular weight of 12000; the polyvinylpyrrolidone is polyvinylpyrrolidone with a K value of 90, polyvinylpyrrolidone with a K value of 60 and polyvinylpyrrolidone with a K value of 30 according to a weight ratio of 3:7: 20.
Example 3
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing a piece to be treated with the surface temperature of 850 ℃ into quenching liquid with the temperature of 25 ℃ for quenching, and then placing the piece to be treated into air for cooling; the quenching-air cooling steps are circularly carried out for 3 times; wherein, in the quenching process, the weight ratio of the to-be-treated piece to the quenching liquid is 1:7, preparing a base material; the cooling time in air is 120s each time; the termination temperature of the first quenching is 350 ℃, and the termination temperature of the 2 nd quenching is 250 ℃; the termination temperature of the 3 rd quenching is 100 ℃;
wherein, the raw materials of the quenching liquid comprise the following components in parts by weight: 33.8 parts of polytetramethylene ether glycol, 26 parts of polyvinyl alcohol, 5.2 parts of polyvinylpyrrolidone, 8 parts of ethylene glycol, 0.75 part of hydroxyethyl hexahydro s-triazine, 1.25 parts of didecyl dimethyl ammonium chloride, 0.625 part of dodecenyl succinic acid, 1.875 parts of benzotriazole and 22 parts of water;
the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 5000, a polytetramethylene ether glycol with a molecular weight of 4000 and a polytetramethylene ether glycol with a molecular weight of 1500 according to a weight ratio of 6:13: 4; the polyvinyl alcohol is the polyvinyl alcohol with the molecular weight of 14000; the weight ratio of polyvinylpyrrolidone to polyvinylpyrrolidone with K value of 70, polyvinylpyrrolidone with K value of 50 and polyvinylpyrrolidone with K value of 22 is 1:11: 13.
Example 4
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing a piece to be treated with the surface temperature of 850 ℃ in quenching liquid with the temperature of 40 ℃ for quenching for the first time, and then placing the piece to be treated in air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 40 ℃ for secondary quenching, and then placing the mixture into air for cooling for 120 seconds; then placing the mixture into quenching liquid with the temperature of 40 ℃ for third quenching, and then placing the mixture into air for cooling for 80 seconds;
wherein, in the quenching process, the weight ratio of the to-be-treated piece to the quenching liquid is 1:5, a step of; the termination temperature of the first quenching is 500 ℃, and the termination temperature of the 2 nd quenching is 350 ℃; the termination temperature of the 3 rd quenching is 250 ℃;
the quenching liquid comprises the following raw materials in parts by weight: 40.8 parts of polytetramethylene ether glycol, 19.2 parts of polyvinyl alcohol, 12 parts of polyvinylpyrrolidone, 11 parts of ethylene glycol, 2 parts of hydroxyethyl hexahydro s-triazine, 0.9 part of didecyl dimethyl ammonium chloride, 1 part of dodecenyl succinic acid, 2 parts of benzotriazole and 30 parts of water;
the polytetramethylene ether glycol is 6000 molecular weight polytetramethylene ether glycol, 3000 molecular weight polytetramethylene ether glycol and 1000 molecular weight polytetramethylene ether glycol, and the weight ratio is 4:15:2, a mixture of two or more of the above-mentioned materials; the polyvinyl alcohol is polyvinyl alcohol with a molecular weight of 12000; the weight ratio of polyvinylpyrrolidone to polyvinylpyrrolidone with K value of 80, polyvinylpyrrolidone with K value of 55 and polyvinylpyrrolidone with K value of 15 is 3:7: 18.
Example 5
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing the piece to be treated in quenching liquid for quenching, and then placing in air for cooling; the quenching-air cooling steps are circularly carried out for 3 times;
wherein the surface temperature of the workpiece to be treated entering the quenching liquid is 900 ℃; the weight ratio of the to-be-treated piece to the quenching liquid is 1:5, a step of; the temperature of the quenching liquid is 35 ℃; the termination temperature of the first quenching in the quenching liquid is 430 ℃, and the termination temperature of the second quenching is 290 ℃; the termination temperature of the 3 rd quenching is 130 ℃; cooling in air for 60s after the first quenching; cooling in air for 90s after the second quenching; cooling in air for 110s after the third quenching;
wherein, the raw materials of the quenching liquid comprise the following components in parts by weight: 29.7 parts of polytetramethylene ether glycol, 23.1 parts of polyvinyl alcohol, 13.2 parts of polyvinylpyrrolidone, 13 parts of ethylene glycol, 1.2 parts of hydroxyethyl hexahydro s-triazine, 0.8 part of didecyl dimethyl ammonium chloride, 1 part of dodecenyl succinic acid, 1.8 parts of benzotriazole and 32 parts of water;
the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 5000, a polytetramethylene ether glycol with a molecular weight of 4500 and a polytetramethylene ether glycol with a molecular weight of 2000, and the weight ratio of the polytetramethylene ether glycol to the polytetramethylene ether glycol is 6:13: 3; the polyvinyl alcohol is polyvinyl alcohol with a molecular weight of 13000; the weight ratio of polyvinylpyrrolidone to polyvinylpyrrolidone with K value of 70, polyvinylpyrrolidone with K value of 43 and polyvinylpyrrolidone with K value of 30 is 1:10: 15.
Example 6
The invention provides a quenching heat treatment process for grinding ball production, which comprises the following steps: placing the piece to be treated with the surface temperature of 860 ℃ in quenching liquid with the temperature of 28 ℃ for first quenching, and then placing the piece to be treated in air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 28 ℃ for secondary quenching, and then placing the mixture into air for cooling for 60 seconds; then placing the mixture into quenching liquid with the temperature of 28 ℃ for third quenching, and then placing the mixture into air for cooling for 60 seconds;
wherein, in the quenching process in the quenching liquid, the weight ratio of the to-be-treated piece to the quenching liquid is 1:4, a step of; the termination temperature of the first quenching is 450 ℃, and the termination temperature of the 2 nd quenching is 280 ℃; the termination temperature of the 3 rd quenching is 100 ℃;
the quenching liquid comprises the following raw materials in parts by weight: 36 parts of polytetramethylene ether glycol, 24 parts of polyvinyl alcohol with the molecular weight of 15000, 15 parts of polyvinylpyrrolidone, 5 parts of ethylene glycol, 1.8 parts of hydroxyethyl hexahydro s-triazine, 0.8 part of didecyl dimethyl ammonium chloride, 1.2 parts of dodecenyl succinic acid, 1.8 parts of benzotriazole and 35 parts of water;
the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 5000, a polytetramethylene ether glycol with a molecular weight of 3000 and a polytetramethylene ether glycol with a molecular weight of 1000 according to a weight ratio of 3:15:2, a mixture of two or more of the above-mentioned materials; the weight ratio of polyvinylpyrrolidone to polyvinylpyrrolidone with K value of 67, polyvinylpyrrolidone with K value of 52 and polyvinylpyrrolidone with K value of 15 is 3:7: 19.
Comparative example 1
The only difference from example 6 is that: it is not quenched three times, but quenched once in quenching liquid until the temperature is 100 ℃, and then cooled in air for 60 seconds.
Comparative example 2
The only difference from example 6 is that: the quenching liquid contains no polytetramethylene ether glycol as raw material.
Comparative example 3
The only difference from example 6 is that: the raw material of the quenching liquid does not contain polyvinyl alcohol with the molecular weight of 15000.
Comparative example 4
The only difference from example 6 is that: the raw materials of the quenching liquid do not contain polyvinylpyrrolidone.
Comparative example 5
The only difference from example 6 is that: the polytetramethylene ether glycol is a polytetramethylene ether glycol with a molecular weight of 5000 and a polytetramethylene ether glycol with a molecular weight of 1000, and the weight ratio of the polytetramethylene ether glycol to the polytetramethylene ether glycol is 3: 2.
Comparative example 6
The only difference from example 6 is that: the polytetramethylene ether glycol is polytetramethylene ether glycol with molecular weight of 5000.
Comparative example 7
The only difference from example 6 is that: the weight ratio of polyvinylpyrrolidone to polyvinylpyrrolidone with K value of 67 and polyvinylpyrrolidone with K value of 15 is 3: 19.
Comparative example 8
The only difference from example 6 is that: the polyvinylpyrrolidone is polyvinylpyrrolidone with K value of 67.
The quenching liquid in examples 1 to 6 and comparative examples 1 to 8 was diluted with water, and the concentration of the quenching liquid in the diluted liquid was 15wt%.
The components of the part to be treated in the embodiment 5 comprise the following components in percentage by weight: c:2%, si:0.6%, mn:1%, cr:16%, P:0.02%, S:0.01%, the balance being Fe; the performance of the treated grinding ball is detected, the surface hardness is 62HRC, and the core hardness is 59HRC; the wear was carried out by using an MLD-10 wear tester, the first 30min wear amount being 41mg, the second 30min wear amount being 43g, the third 30min wear amount being 37mg, and the total 90min wear amount being 121mg.
The components of the parts to be treated in example 6 and comparative examples 1 to 8 comprise, in weight percent: c:3.54%, si:2.52%, mn:2.23%, cr:0.38%, P:0.025%, S:0.018%, the balance being Fe.
The performance of the balls treated in example 6 and comparative examples 1 to 8 was examined, wherein the balls of example 6 had a surface hardness of 60HRC and a core hardness of 58.7HRC; whereas the surface hardness of the grinding balls of comparative examples 1-8 was 53-56HRC, and the core hardness was 51.3-54HRC; the grinding balls of the example 6 and the comparative examples 1-8 are abraded by an MLD-10 abrasion tester, wherein the abrasion amount of the grinding ball of the example 6 is 40mg in the first 30min, 41mg in the second 30min, 38g in the third 30min and 119mg in the total abrasion amount in 90 min; whereas the total wear amount of the comparative examples 1 to 8 was 155 to 162mg in 90 minutes.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (7)
1. A quenching heat treatment process for grinding ball production, which is characterized by comprising the following steps: placing the piece to be treated in quenching liquid for quenching, and then placing in air for cooling; the steps are circularly carried out;
wherein, the raw materials of the quenching liquid comprise a macromolecular composition composed of polytetramethylene ether glycol, polyvinyl alcohol and polyvinylpyrrolidone; the polytetramethylene ether glycol is a mixture of polytetramethylene ether glycol with a molecular weight of 5000-15000, polytetramethylene ether glycol with a molecular weight of 3000-4500 and polytetramethylene ether glycol with a molecular weight of 1000-2000; the polyvinylpyrrolidone is a mixture of polyvinylpyrrolidone with a K value of 65-90, polyvinylpyrrolidone with a K value of 45-60 and polyvinylpyrrolidone with a K value of 15-30;
the weight ratio of the to-be-treated piece to the quenching liquid is 1:4-7; the temperature of the quenching liquid is 20-45 ℃;
circularly performing the steps for n times, wherein n is more than or equal to 2;
termination temperature T of first quenching in quenching liquid 1 At 350-500 ℃, the termination temperature T of the nth quenching n 100-250deg.C, and T 1 ＞T 2 ＞…＞T n-1 ＞T n ；
The quenching liquid comprises the following raw materials in parts by weight: 7-10:2-5;
the weight ratio of the polytetramethylene ether glycol with the molecular weight of 5000-15000 to the polytetramethylene ether glycol with the molecular weight of 3000-4500 to the polytetramethylene ether glycol with the molecular weight of 1000-2000 is 2-7:11-17:1.5-4; the weight ratio of the polyvinylpyrrolidone with the K value of 65-90 to the polyvinylpyrrolidone with the K value of 45-60 to the polyvinylpyrrolidone with the K value of 15-30 is 1-4:5-11:13-20;
the polyvinyl alcohol is polyvinyl alcohol with the molecular weight of 12000-16000.
2. The quenching heat treatment process for the production of grinding balls according to claim 1, wherein the time for each cooling in air is 60-120s.
3. The quenching heat treatment process for producing grinding balls according to claim 1, wherein the surface temperature of the workpiece to be treated entering the quenching liquid is 850-920 ℃.
4. A quenching heat treatment process for the production of grinding balls according to any one of claims 1 to 3, wherein the raw materials of the quenching liquid comprise, in parts by weight: 62-75 parts of high molecular composition, 2-15 parts of glycol, 1.8-2.9 parts of bactericide, 2.5-3.2 parts of antirust agent and 15-35 parts of water.
5. The quenching heat treatment process for producing grinding balls according to claim 4, wherein the bactericide is hydroxyethyl hexahydro s-triazine and didecyl dimethyl ammonium chloride, and the weight ratio is 3-12: 1-5; the antirust agent is dodecenyl succinic acid and benzotriazole, and the weight ratio is 2-6: 7-15.
6. The quenching heat treatment process for the production of grinding balls according to claim 1, wherein the termination temperature T of the first quenching 1 At 350-500 deg.C, the termination temperature T of the 2 nd quenching 2 250-350 ℃; termination temperature T of the 3 rd quench 3 100-250 ℃.
7. The quenching heat treatment process for grinding ball production according to claim 6, wherein the termination temperature T of the first quenching 1 At a temperature of 450 ℃, the termination temperature T of the 2 nd quenching 2 280 ℃; termination temperature T of the 3 rd quench 3 130 ℃.
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