CN115505844B - Die forging and soft nitriding method for mine car wheels - Google Patents
Die forging and soft nitriding method for mine car wheels Download PDFInfo
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- CN115505844B CN115505844B CN202211158413.3A CN202211158413A CN115505844B CN 115505844 B CN115505844 B CN 115505844B CN 202211158413 A CN202211158413 A CN 202211158413A CN 115505844 B CN115505844 B CN 115505844B
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- 238000005242 forging Methods 0.000 title claims abstract description 82
- 238000005121 nitriding Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 50
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 30
- 239000000047 product Substances 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- 238000005496 tempering Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 239000011265 semifinished product Substances 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims abstract description 7
- 230000000171 quenching effect Effects 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000004321 preservation Methods 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000005065 mining Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 238000005256 carbonitriding Methods 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 ores Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000007669 thermal treatment Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
-
- 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
- C21D1/26—Methods of annealing
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a die forging and soft nitriding method for a mine car wheel, which specifically comprises the following steps: (1) Placing steel for soft nitriding treatment in a heating furnace for forging, forging the steel into a die forging stock, and removing oxide skin on the surface of the die forging stock; (2) Preheating a die forging die, transferring the die forging blank with the surface oxide skin removed into a forging press, and performing die forging through the die forging die; (3) After the die forging die is taken out, the die forging die is put into a heat treatment furnace for quenching and tempering treatment, and a semi-finished product of the mine car wheel is obtained; (4) Placing the semi-finished product of the mine car wheel after quenching and tempering in a nitriding furnace for soft nitriding treatment; (5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product; (6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel. The invention relates to the technical field of mine car wheel machining, in particular to a die forging and soft nitriding method for mine car wheels, which effectively improves the technical problems of product strength and durability by combining a novel die forging machining mode with soft nitriding.
Description
Technical Field
The invention relates to the technical field of mine car wheel machining, in particular to a die forging and soft nitriding method for mine car wheels.
Background
Mine cars are standard or narrow-gauge railway transportation vehicles for conveying bulk materials such as ores, waste stones, coal and the like in mines, and are generally pulled by locomotives or winches. The mine car is mainly used for rail transportation of underground tunnel, shaft and ground of mine. Mine car wheels are important components of mine cars, and have higher requirements for strength and durability.
The existing mine car wheel is mainly produced in a casting mode, and heat treatment is carried out after casting processing. The mine car wheel produced by casting has the advantages of low cost and the like, but also has the problems of insufficient strength and durability of the product, the quality problems of air holes, sand holes and the like are inevitably generated in the metal casting process, the density of the cast product is low, the strength and durability of the existing mine car wheel are insufficient, the damage and the replacement are frequent, and even safety accidents are caused.
Soft nitriding is also known as nitrocarburizing or ferritic nitrocarburizing. Is a chemical surface heat treatment process for simultaneously penetrating nitrogen and carbon atoms into the surface of a steel part under the action of high temperature. In order to shorten the nitriding cycle and make the nitriding process not limited by the steel grade, a soft nitriding process has been developed over the last two decades on the basis of a low temperature nitriding process. The soft nitriding is essentially low-temperature carbonitriding mainly comprising nitriding, and is called soft nitriding because of the fact that the steel is infiltrated with a small amount of carbon atoms in addition to nitrogen atoms, and the treated steel has a lower hardness and a lower brittleness than the above-mentioned general gas nitrogen.
Gas soft nitriding is used as one of the soft nitriding methods, and is carried out by low-temperature nitrogen and carbon co-permeation in an atmosphere containing carbon and nitrogen atoms, and common co-permeation mediums are urea, formamide and triethanolamine, which undergo thermal decomposition reaction at the soft nitriding temperature to generate active carbon and nitrogen atoms. Activated carbon and nitrogen atoms are absorbed by the surface of the workpiece and permeate into the surface layer of the workpiece through diffusion, so that a carbonitriding layer mainly containing nitrogen is obtained.
Disclosure of Invention
Aiming at the situation, in order to make up the existing defects, the invention provides a die forging and soft nitriding method for the mining car wheel, which effectively improves the technical problems of product strength and durability by combining a novel die forging processing mode with soft nitriding.
The invention provides the following technical scheme: the invention relates to a die forging and soft nitriding method for a mine car wheel, which specifically comprises the following steps:
(1) Placing steel for soft nitriding treatment in a heating furnace for forging, forging the steel into a die forging stock, and removing oxide skin on the surface of the die forging stock;
(2) Preheating a die forging die, transferring the die forging blank with the surface oxide skin removed into a forging press, and performing die forging through the die forging die;
(3) Taking out the die forging die, and then, carrying out thermal refining in a thermal treatment furnace to obtain a semi-finished product of the mine wheel, wherein the tempering times of the thermal refining are 2 times, the primary tempering is 480 ℃ for 5 hours, and the secondary tempering is 500 ℃ for 6 hours, so that the formation of netlike carbide inside the wheel is inhibited, the internal stress is eliminated, and a good internal structure of the wheel is obtained and the toughness of the wheel is improved;
(4) Placing the semi-finished product of the mine car wheel after quenching and tempering in a nitriding furnace, vacuumizing the nitriding furnace, introducing nitrogen to perform protective gas filling, introducing ethanol solution, keeping introducing nitrogen to 260-350 ℃, stopping nitrogen supply, introducing dry ammonia gas, continuously heating the nitriding furnace, and controlling the temperature of the nitriding furnace to be at a soft nitriding treatment temperature to enter a nitriding heat preservation stage;
(5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product;
(6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel.
Further, the steel for soft nitriding treatment in the step (1) comprises the following components: and C:0.25 to 0.35 percent of Si:0.1 to 0.2 percent of Mn:0.8 to 1.2 percent of Cr:2.5 to 5.0 percent of N:0.03 to 0.05 percent of P:0.01 to 0.03 percent, S: 0.005-0.015%, al:0.01 to 0.06 percent, V:0.05 to 0.1 percent, and the balance of Fe and unavoidable impurities, wherein the sum of the mass percentages of the components is 100 percent.
Further, the initial forging temperature in the heating furnace in the step (1) is 1250-1350 ℃, the annealing temperature is 1300-1400 ℃, and the annealing heat preservation time is 30-40 min.
Further, the preheating temperature of the die forging die in the step (2) is 220-260 ℃.
Further, the soft nitriding treatment temperature in the step (4) is 560-620 ℃, and the soft nitriding heat preservation time is as follows: 100-150 minutes.
Further, the dripping speed of the ethanol solution in the step (4) is 50-100 d/min.
The beneficial effects obtained by the invention by adopting the structure are as follows: according to the die forging and soft nitriding method for the mining car wheel, the die forging forming and the soft nitriding treatment method are combined, so that the density, the strength and the durability of the product are effectively improved, and the product is homogeneous inside and outside and has consistent performance; the product quality is stable, and the use and maintenance cost can be greatly reduced.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention provides the following technical scheme: the invention relates to a die forging and soft nitriding method for a mine car wheel, which specifically comprises the following steps:
(1) Placing steel for soft nitriding treatment in a heating furnace for forging, wherein the initial forging temperature in the heating furnace is 1250-1350 ℃, the annealing temperature is 1300-1400 ℃, the annealing heat preservation time is 30-40 min, and removing oxide skin on the surface of the die forging stock, and the steel for soft nitriding treatment comprises the following components: and C:0.25%, si:0.1%, mn:0.8%, cr:2.5%, N:0.03%, P:0.01%, S:0.005%, al:0.01%, V:0.05% and the balance of Fe and unavoidable impurities, wherein the sum of the mass percentages of the components is 100%;
(2) Preheating a die forging die, wherein the preheating temperature of the die forging die is 220-260 ℃, transferring a die forging blank with surface oxide skin removed into a forging press, and die forging through the die forging die;
(3) Taking out the die forging die, and then, carrying out thermal refining in a heat treatment furnace to obtain a semi-finished product of the mine wheel, wherein the thermal refining adopts a technical scheme of 2 times of tempering, the primary tempering is 480 ℃ for 5 hours, and the secondary tempering is 500 ℃ for 6 hours, so that the formation of netlike carbide inside the wheel is inhibited, the internal stress is eliminated, and a good internal structure of the wheel is obtained and the toughness of the wheel is improved;
(4) Placing the semi-finished product of the mine car wheel after quenching and tempering in a nitriding furnace, vacuumizing the nitriding furnace, filling protective gas by introducing nitrogen with the vacuum degree of 22-28 pa, introducing ethanol solution with the liquid dropping speed of 50-100 d/min, stopping nitrogen supply after nitrogen is introduced to the temperature in the furnace to 260-350 ℃, introducing dry ammonia gas, continuously heating the nitriding furnace, controlling the temperature of the nitriding furnace to enter a nitriding heat preservation stage at the soft nitriding temperature of 560-620 ℃, and preserving heat for the soft nitriding heat preservation time: 100-150 minutes;
(5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product;
(6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel.
Example 2
The invention provides the following technical scheme: the invention relates to a die forging and soft nitriding method for a mine car wheel, which specifically comprises the following steps:
(1) Placing steel for soft nitriding treatment in a heating furnace for forging, wherein the initial forging temperature in the heating furnace is 1250-1350 ℃, the annealing temperature is 1300-1400 ℃, the annealing heat preservation time is 30-40 min, and removing oxide skin on the surface of the die forging stock, and the steel for soft nitriding treatment comprises the following components: and C:0.3%, si:0.15%, mn:1.0%, cr:3.75%, N:0.04%, P:0.02%, S:0.01%, al:0.035%, V:0.075%, the balance being Fe and unavoidable impurities, the sum of the mass percentages of the components being 100%;
(2) Preheating a die forging die, wherein the preheating temperature of the die forging die is 220-260 ℃, transferring a die forging blank with surface oxide skin removed into a forging press, and die forging through the die forging die;
(3) Taking out the die forging die, and then, carrying out thermal refining in a heat treatment furnace to obtain a semi-finished product of the mine wheel, wherein the thermal refining adopts a technical scheme of 2 times of tempering, the primary tempering is 480 ℃ for 5 hours, and the secondary tempering is 500 ℃ for 6 hours, so that the formation of netlike carbide inside the wheel is inhibited, the internal stress is eliminated, and a good internal structure of the wheel is obtained and the toughness of the wheel is improved;
(4) Placing the semi-finished product of the mine car wheel after quenching and tempering in a nitriding furnace, vacuumizing the nitriding furnace, filling protective gas by introducing nitrogen with the vacuum degree of 22-28 pa, introducing ethanol solution with the liquid dropping speed of 50-100 d/min, stopping nitrogen supply after nitrogen is introduced to the temperature in the furnace to 260-350 ℃, introducing dry ammonia gas, continuously heating the nitriding furnace, controlling the temperature of the nitriding furnace to enter a nitriding heat preservation stage at the soft nitriding temperature of 560-620 ℃, and preserving heat for the soft nitriding heat preservation time: 100-150 minutes;
(5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product;
(6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel.
Example 3
The invention provides the following technical scheme: the invention relates to a die forging and soft nitriding method for a mine car wheel, which specifically comprises the following steps:
(1) Placing steel for soft nitriding treatment in a heating furnace for forging, wherein the initial forging temperature in the heating furnace is 1250-1350 ℃, the annealing temperature is 1300-1400 ℃, the annealing heat preservation time is 30-40 min, and removing oxide skin on the surface of the die forging stock, and the steel for soft nitriding treatment comprises the following components: and C:0.35%, si:0.2%, mn:1.2%, cr:5.0%, N:0.05%, P:0.03%, S:0.015%, al:0.06%, V:0.1% of Fe and unavoidable impurities, wherein the balance is 100% of the sum of the mass percentages of the components;
(2) Preheating a die forging die, wherein the preheating temperature of the die forging die is 220-260 ℃, transferring a die forging blank with surface oxide skin removed into a forging press, and die forging through the die forging die;
(3) Taking out the die forging die, and then, carrying out thermal refining in a heat treatment furnace to obtain a semi-finished product of the mine wheel, wherein the thermal refining adopts a technical scheme of 2 times of tempering, the primary tempering is 480 ℃ for 5 hours, and the secondary tempering is 500 ℃ for 6 hours, so that the formation of netlike carbide inside the wheel is inhibited, the internal stress is eliminated, and a good internal structure of the wheel is obtained and the toughness of the wheel is improved;
(4) Placing the semi-finished product of the mine car wheel after quenching and tempering in a nitriding furnace, vacuumizing the nitriding furnace, filling protective gas by introducing nitrogen with the vacuum degree of 22-28 pa, introducing ethanol solution with the liquid dropping speed of 50-100 d/min, stopping nitrogen supply after nitrogen is introduced to the temperature in the furnace to 260-350 ℃, introducing dry ammonia gas, continuously heating the nitriding furnace, controlling the temperature of the nitriding furnace to enter a nitriding heat preservation stage at the soft nitriding temperature of 560-620 ℃, and preserving heat for the soft nitriding heat preservation time: 100-150 minutes;
(5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product;
(6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. The die forging and soft nitriding method for the mining car wheel is characterized by comprising the following steps of:
(1) Placing steel for soft nitriding treatment in a heating furnace for forging, forging the steel into a die forging stock, and removing oxide skin on the surface of the die forging stock, wherein the initial forging temperature in the heating furnace is 1250-1350 ℃, the annealing temperature is 1300-1400 ℃, and the annealing heat preservation time is 30-40 min;
(2) Preheating a die forging die, transferring the die forging blank with the surface oxide skin removed into a forging press, and performing die forging through the die forging die, wherein the preheating temperature of the die forging die is 220-260 ℃;
(3) Taking out the die forging die, and then, carrying out thermal refining in a heat treatment furnace to obtain a semi-finished product of the mine car wheel, wherein the tempering times of the thermal refining are 2 times, the primary tempering is 480 ℃ for 5 hours, and the secondary tempering is 500 ℃ for 6 hours;
(4) Placing the semi-finished product of the mine car wheel after quenching and tempering into a nitriding furnace, vacuumizing the nitriding furnace, filling protective gas by introducing nitrogen with the vacuum degree of 22-28 pa, introducing ethanol solution, keeping introducing nitrogen until the temperature in the furnace reaches 260-350 ℃, stopping nitrogen supply, introducing dry ammonia gas, continuously heating the nitriding furnace, controlling the temperature of the nitriding furnace to enter a nitriding heat preservation stage at a soft nitriding temperature of 560-620 ℃, and performing soft nitriding heat preservation for the duration: 100-150 minutes;
(5) Charging nitrogen into the furnace, cooling to below 280 ℃, opening a furnace door, and discharging the product;
(6) And removing burrs of the discharged product to obtain the finished product of the mine car wheel.
2. The method of die forging and soft nitriding for a mining vehicle wheel according to claim 1, wherein the soft nitriding steel material in the step (1) comprises the following components: and C:0.25 to 0.35 percent of Si:0.1 to 0.2 percent of Mn:0.8 to 1.2 percent of Cr:2.5 to 5.0 percent of N:0.03 to 0.05 percent of P:0.01 to 0.03 percent, S: 0.005-0.015%, al:0.01 to 0.06 percent, V:0.05 to 0.1 percent, and the balance of Fe and unavoidable impurities, wherein the sum of the mass percentages of the components is 100 percent.
3. The method for die forging and soft nitriding of mine car wheels according to claim 1, wherein the dripping speed of the ethanol solution in the step (4) is 50-100 d/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211158413.3A CN115505844B (en) | 2022-09-22 | 2022-09-22 | Die forging and soft nitriding method for mine car wheels |
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| CN202211158413.3A CN115505844B (en) | 2022-09-22 | 2022-09-22 | Die forging and soft nitriding method for mine car wheels |
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| CN115505844A CN115505844A (en) | 2022-12-23 |
| CN115505844B true CN115505844B (en) | 2023-06-27 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10226818A (en) * | 1996-12-11 | 1998-08-25 | Sumitomo Metal Ind Ltd | Production of steel for soft-nitriding and soft-nitrided parts using this steel |
| JP2000160287A (en) * | 1998-11-20 | 2000-06-13 | Sumitomo Metal Ind Ltd | Nitriding non-heat treated forged parts and manufacture thereof |
| JP2012177167A (en) * | 2011-02-28 | 2012-09-13 | Jfe Steel Corp | Steel sheet for soft nitriding treatment, and its manufacturing method |
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| JP5034803B2 (en) * | 2007-09-12 | 2012-09-26 | Ｊｆｅスチール株式会社 | Steel sheet for soft nitriding treatment and method for producing the same |
| US20110186182A1 (en) * | 2009-05-15 | 2011-08-04 | Tetsushi Chida | Steel for nitrocarburizing and nitrocarburized parts |
| CN102517521B (en) * | 2011-12-20 | 2013-09-25 | 莱芜钢铁集团有限公司 | MnCr carburized gear steel and its production method |
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| CN103993223A (en) * | 2014-05-06 | 2014-08-20 | 上海大学 | Ultrahigh thermal conductivity wear-resistant hot stamping die steel and manufacturing method thereof |
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| JPH10226818A (en) * | 1996-12-11 | 1998-08-25 | Sumitomo Metal Ind Ltd | Production of steel for soft-nitriding and soft-nitrided parts using this steel |
| JP2000160287A (en) * | 1998-11-20 | 2000-06-13 | Sumitomo Metal Ind Ltd | Nitriding non-heat treated forged parts and manufacture thereof |
| JP2012177167A (en) * | 2011-02-28 | 2012-09-13 | Jfe Steel Corp | Steel sheet for soft nitriding treatment, and its manufacturing method |
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