CN114381653A - I-shaped elastic strip and processing technology - Google Patents
I-shaped elastic strip and processing technology Download PDFInfo
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- CN114381653A CN114381653A CN202011119993.6A CN202011119993A CN114381653A CN 114381653 A CN114381653 A CN 114381653A CN 202011119993 A CN202011119993 A CN 202011119993A CN 114381653 A CN114381653 A CN 114381653A
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- 238000012545 processing Methods 0.000 title claims abstract description 23
- 238000005516 engineering process Methods 0.000 title claims abstract description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 44
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 37
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 32
- 239000011651 chromium Substances 0.000 claims abstract description 32
- 238000004140 cleaning Methods 0.000 claims abstract description 29
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims abstract description 26
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 26
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 22
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- 229910052802 copper Inorganic materials 0.000 claims abstract description 22
- 239000010949 copper Substances 0.000 claims abstract description 22
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 22
- 239000011574 phosphorus Substances 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 22
- 239000010703 silicon Substances 0.000 claims abstract description 22
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 22
- 239000011593 sulfur Substances 0.000 claims abstract description 22
- 239000003921 oil Substances 0.000 claims abstract description 14
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 13
- 238000005422 blasting Methods 0.000 claims abstract description 13
- 239000008367 deionised water Substances 0.000 claims abstract description 13
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 13
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- CXOWYMLTGOFURZ-UHFFFAOYSA-N azanylidynechromium Chemical compound [Cr]#N CXOWYMLTGOFURZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 41
- 230000006698 induction Effects 0.000 claims description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 18
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 18
- 238000004512 die casting Methods 0.000 claims description 17
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000004321 preservation Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 238000007733 ion plating Methods 0.000 claims description 11
- 238000009661 fatigue test Methods 0.000 claims description 10
- 238000005242 forging Methods 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 10
- 229910000734 martensite Inorganic materials 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 239000011265 semifinished product Substances 0.000 claims description 10
- 239000013077 target material Substances 0.000 claims description 10
- 238000010891 electric arc Methods 0.000 claims description 9
- 238000005452 bending Methods 0.000 claims description 6
- 238000003723 Smelting Methods 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000002950 deficient Effects 0.000 claims description 5
- 238000000151 deposition Methods 0.000 claims description 5
- 238000005098 hot rolling Methods 0.000 claims description 5
- 230000003116 impacting effect Effects 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 5
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 238000007747 plating Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000004544 sputter deposition Methods 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 5
- 239000000956 alloy Substances 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 3
- 230000002265 prevention Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 229910000639 Spring steel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 241001669679 Eleotris Species 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/021—Cleaning or etching treatments
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- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/02—Pretreatment of the material to be coated
- C23C14/028—Physical treatment to alter the texture of the substrate surface, e.g. grinding, polishing
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- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
- C23C14/0641—Nitrides
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- 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
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/24—Vacuum evaporation
- C23C14/32—Vacuum evaporation by explosion; by evaporation and subsequent ionisation of the vapours, e.g. ion-plating
- C23C14/325—Electric arc evaporation
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- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses an I-shaped elastic strip and a processing technology thereof, and the formula comprises: the alloy comprises carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, and the mass percentages of the components are as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus and 0.11-0.32% of sulfur, and the balance of molten iron; according to the invention, the chromium nitride film is plated on the surface of the I-shaped elastic strip subjected to shot blasting rust prevention treatment, so that the hardness and the corrosion resistance of the I-shaped elastic strip are improved, the service life of the I-shaped elastic strip is prolonged, and the maintenance cost of a traffic track is saved; the cleaning solution prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water is used for carrying out ultrasonic cleaning on the I-shaped elastic strip, so that the residual oil stain, accumulated scale, oxide and other impurities on the surface of the I-shaped elastic strip are thoroughly removed, the adhesion strength of the chromium nitride film is improved, the smoothness, cleanness and brightness of the surface of the I-shaped elastic strip are ensured, and the processing precision of the I-shaped elastic strip is improved.
Description
Technical Field
The invention relates to the technical field of industrial and mining accessories, in particular to an I-shaped elastic strip and a processing technology thereof.
Background
Railway rails are components that support and orient locomotives, and are secured to the sleepers of the track bed by resilient fasteners. The buckling and pressing piece of the elastic fastener is mainly an elastic strip, and the buckling and pressing piece generates buckling and pressing force to act on the rail through bending and twisting deformation of the elastic strip, so that reliable connection between the steel rails is effectively ensured for a long time, the integrity of the rail is kept as much as possible, the steel rails are prevented from moving longitudinally and transversely relative to the sleeper, and the rail gauge is ensured to be normal, thereby ensuring the running safety of rail vehicles. At present, spring-strip type buckling parts are mostly used in railways and other rail traffics in China, and the spring-strip type buckling parts in China mainly have the following forms: the elastic strips are installed by bolts in omega structure forms, such as I-type and II-type elastic strips, small-resistance elastic strips of a stone bridge, WJ-2 type elastic strips and the like which are used in the prior art; bolder types without bolt installation, such as III type elastic strips, elastic strips for DT VI fasteners, PR type elastic strips for Guangzhou subways, and the like; there are also other structural forms of elastic strip, double-toe elastic strip and middle elastic strip.
However, most of the existing I-shaped elastic strips are made of spring steel simply, and have low hardness, poor corrosion resistance, serious damage when used in a severe environment, inevitably shortened service life of the I-shaped elastic strips, increased maintenance cost of traffic tracks, insufficient cleaning force in a processing process, incapability of thoroughly removing impurities such as oil stains, scale deposits and oxides remaining on the surfaces of the I-shaped elastic strips, influence the smoothness, cleanness and brightness of the surfaces of the I-shaped elastic strips, and reduction of the processing precision of the I-shaped elastic strips.
Disclosure of Invention
The invention aims to provide an I-shaped elastic strip and a processing technology thereof, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: a type I bullet strip comprises the following formula: the alloy comprises carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, and the mass percentages of the components are as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus, 0.11-0.32% of sulfur and the balance of molten iron.
A processing technology of an I-shaped elastic strip comprises the following steps of preparing materials; step two, heating; step three, molding; step four, quenching; step five, tempering; step six, shot blasting; step seven, cleaning; step eight, coating a film; step nine, quality inspection;
in the first step, according to the mass percent of each component, 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus and 0.11-0.32% of sulfur are respectively selected, the balance is molten iron, then the carbon, the silicon, the manganese, the chromium, the nickel, the copper, the phosphorus, the sulfur and the molten iron are poured into a smelting furnace together, and the elastic bar steel is smelted by a known method;
in the second step, the steel bar of the elastic strip smelted in the first step is put into a medium-frequency induction heating furnace, and is rapidly heated into molten liquid by utilizing induction current, so that molten steel of the elastic strip is prepared;
pouring the molten steel of the elastic strip prepared in the step two into a die casting machine, then injecting the molten steel into a die casting die in a prefabricated shape, performing primary forging forming after die assembly, cooling and die opening, then placing the die casting die on a hot rolling machine, performing stretch bending rolling to obtain the prefabricated shape, and performing final forging forming to obtain the hot-rolled elastic strip;
in the fourth step, the hot-rolled elastic strip prepared in the third step is placed into a medium-frequency induction heating furnace, is heated, is subjected to heat preservation and normalizing, is immersed into cold quenching oil, and is rapidly cooled and quenched to convert austenite into martensite, so that a quenched elastic strip is prepared;
in the fifth step, the quenched elastic strip prepared in the fourth step is subjected to constant-speed air cooling, and is cooled to the intermediate temperature and then is subjected to heat preservation and tempering, so that martensite is converted into troostite, and the tempered elastic strip is prepared;
in the sixth step, the tempered elastic strip prepared in the fifth step is cooled to normal temperature in a furnace, and then is placed into a shot blasting machine, the surface of the tempered elastic strip is impacted by utilizing a shot flow moving at high speed, so that a plastic circulating strain layer is generated on the surface of the tempered elastic strip, the surface microstructure and the residual compressive stress field are changed, and an elastic strip blank is prepared;
putting the elastic strip blank prepared in the step six into an ultrasonic cleaning machine, adding a proper amount of cleaning solution, removing impurities such as oil stains, scales and oxides remained on the surface of the elastic strip blank by utilizing ultrasonic oscillation, cleaning, taking out and draining;
putting the elastic strip blank cleaned in the step seven into an electric arc ion plating machine, adding a proper amount of chromium target material fixing plate, vacuumizing, injecting a proper amount of nitrogen, generating high-density plasma after coupling glow discharge of the nitrogen, impacting the chromium target material fixing plate, enabling the nitrogen and the impacted chromium atoms to pass through vacuum, sputtering and depositing on the surface of the elastic strip blank, plating a chromium nitride film with a prefabricated thickness, and air-cooling to normal temperature to obtain an elastic strip semi-finished product;
and step nine, placing the semi-finished product of the elastic strip manufactured in the step eight on a quality inspection table, respectively detecting various performances such as size, surface roughness and hardness, performing fatigue tests, screening out unqualified defective products, and packaging qualified finished products into a warehouse to obtain the I-type elastic strip.
According to the technical scheme, in the second step, the operating frequency of the medium-frequency induction heating furnace is 900Hz to 21kHz, and the heating temperature is 950 to 1150 ℃.
According to the technical scheme, in the third step, the operating temperature of the die casting machine is 850-1100 ℃, and the die closing time is 8-15 min.
According to the technical scheme, in the fourth step, the normalizing temperature of the medium-frequency induction heating furnace is 855-875 ℃, and the quenching temperature is 830-850 ℃.
According to the technical scheme, in the fifth step, the tempering temperature of the medium-frequency induction heating furnace is 415-465 ℃, and the heat preservation time is 25-45 min.
According to the technical scheme, in the seventh step, the operating frequency of the ultrasonic cleaning machine is 5-12 kHz, and the cleaning time is 20-40 min.
According to the technical scheme, in the seventh step, the cleaning solution is prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water, and the weight ratio of the acetone to the phosphoric acid to the sodium hydroxide to the deionized water is 4: 2: 1: 8.
According to the technical scheme, in the eighth step, the vacuum degree of the arc ion plating machine is-0.006 to-0.004 Pa, and the operating temperature is 110 to 130 ℃.
According to the technical scheme, in the ninth step, the qualified requirements of the I-type elastic strip are that the surface has no crack nicks and burrs, the metallographic structure is uniform tempered troostite, the center part is allowed to have trace intermittent ferrite, the total decarburized layer depth is 0-0.2 mm, the I-type elastic strip does not crack after 500 ten thousand fatigue tests, the residual deformation is 0-1 mm, the hardness is 41-46 HRC, and the buckling pressure is 9-13 kN.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the chromium nitride film is plated on the surface of the I-shaped elastic strip subjected to shot blasting rust prevention treatment by using an electric arc ion plating method, so that the hardness and the corrosion resistance of the I-shaped elastic strip are improved, the damage amount of the I-shaped elastic strip in a severe environment is reduced, the service life of the I-shaped elastic strip is prolonged, and the maintenance cost of a traffic track is saved; the cleaning solution prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water is used for carrying out ultrasonic cleaning on the I-shaped elastic strip, so that impurities such as residual oil stains, accumulated scale and oxides on the surface of the I-shaped elastic strip are thoroughly removed, the adhesion strength of the chromium nitride film is improved, the smoothness, cleanness and brightness of the surface of the I-shaped elastic strip are ensured, and the processing precision of the I-shaped elastic strip is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution:
example 1:
a type I bullet strip comprises the following formula: the alloy comprises carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, and the mass percentages of the components are as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus, 0.11-0.32% of sulfur and the balance of molten iron.
A processing technology of an I-shaped elastic strip comprises the following steps of preparing materials; step two, heating; step three, molding; step four, quenching; step five, tempering; step six, shot blasting; step seven, cleaning; step eight, coating a film; step nine, quality inspection;
in the first step, 0.56% of carbon, 1.5% of silicon, 0.6% of manganese, 0.15% of chromium, 0.12% of nickel, 0.09% of copper, 0.13% of phosphorus and 0.11% of sulfur are respectively selected according to the mass percent of each component, and the balance is molten iron, then the carbon, the silicon, the manganese, the chromium, the nickel, the copper, the phosphorus, the sulfur and the molten iron are poured into a smelting furnace together, and the spring steel is smelted by a known method;
in the second step, the elastic bar steel refined in the first step is placed into a medium-frequency induction heating furnace, and is rapidly heated into molten liquid by utilizing induction current, so that elastic bar molten steel is prepared, wherein the operating frequency of the medium-frequency induction heating furnace is 900 Hz-21 kHz, and the heating temperature is 950-1150 ℃;
pouring the elastic strip molten steel prepared in the step two into a die casting machine, then injecting the elastic strip molten steel into a die casting die in a prefabricated shape, performing initial forging forming after die assembly, cooling and die opening, wherein the operating temperature of the die casting machine is 850-1100 ℃, the die assembly time is 8-15 min, then placing the elastic strip on a hot rolling mill, performing stretch bending rolling to obtain the prefabricated shape, and performing final forging forming to obtain the hot-rolled elastic strip;
in the fourth step, the hot-rolled elastic strip prepared in the third step is placed into a medium-frequency induction heating furnace, heat preservation and normalizing are carried out after heating, the normalizing temperature of the medium-frequency induction heating furnace is 855-875 ℃, then the medium-frequency induction heating furnace is immersed into cold quenching oil, rapid cooling quenching is carried out, the quenching temperature is 830-850 ℃, austenite is converted into martensite, and the quenched elastic strip is prepared;
in the fifth step, the quenched elastic strip prepared in the fourth step is subjected to constant-speed air cooling, the temperature is reduced to the intermediate temperature, then the heat preservation tempering is carried out, the tempering temperature of the intermediate frequency induction heating furnace is 415-465 ℃, the heat preservation time is 25-45 min, martensite is converted into troostite, and the tempered elastic strip is prepared;
in the sixth step, the tempered elastic strip prepared in the fifth step is cooled to normal temperature in a furnace, and then is placed into a shot blasting machine, the surface of the tempered elastic strip is impacted by utilizing a shot flow moving at high speed, so that a plastic circulating strain layer is generated on the surface of the tempered elastic strip, the surface microstructure and the residual compressive stress field are changed, and an elastic strip blank is prepared;
placing the elastic strip blank prepared in the step six into an ultrasonic cleaning machine, adding a proper amount of cleaning solution, wherein the cleaning solution is prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water, the weight ratio of the acetone to the phosphoric acid to the sodium hydroxide to the deionized water is 4: 2: 1: 8, removing impurities such as oil stains, scales and oxides remained on the surface of the elastic strip blank by utilizing ultrasonic oscillation, the operating frequency of the ultrasonic cleaning machine is 5-12 kHz, the cleaning time is 20-40 min, and taking out and draining after cleaning;
putting the elastic strip blank cleaned in the step seven into an electric arc ion plating machine, adding a proper amount of chromium target material fixing plate, vacuumizing, wherein the vacuum degree of the electric arc ion plating machine is-0.006 to-0.004 Pa, the operation temperature is 110-130 ℃, injecting a proper amount of nitrogen, generating high-density plasma after coupling glow discharge of the nitrogen, impacting the chromium target material fixing plate, enabling the nitrogen and impacted chromium atoms to pass through vacuum together, sputtering and depositing on the surface of the elastic strip blank, plating a chromium nitride film with a prefabricated thickness, and air-cooling to normal temperature to obtain an elastic strip semi-finished product;
placing the semi-finished product of the bullet strip prepared in the step eight on a quality inspection table, respectively detecting the size, the surface roughness, the hardness and other properties, performing a fatigue test, screening out unqualified defective products, and packaging qualified finished products into a warehouse to obtain the I-type bullet strip, wherein the qualified requirements of the I-type bullet strip are that the surface of the I-type bullet strip has no cracks and nicks and burrs, the metallographic structure is a uniform tempering troostite, the core part of the I-type bullet strip is allowed to have trace discontinuous ferrite, the total decarburization layer depth is 0-0.2 mm, the I-type bullet strip is not cracked after 500 ten thousand times of fatigue tests, the residual deformation is 0-1 mm, the hardness is 41-46 HRC, and the buckling pressure is 9-13 kN.
Example 2:
a type I bullet strip comprises the following formula: the alloy comprises carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, and the mass percentages of the components are as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus, 0.11-0.32% of sulfur and the balance of molten iron.
A processing technology of an I-shaped elastic strip comprises the following steps of preparing materials; step two, heating; step three, molding; step four, quenching; step five, tempering; step six, shot blasting; step seven, cleaning; step eight, coating a film; step nine, quality inspection;
in the first step, 0.6% of carbon, 1.8% of silicon, 0.7% of manganese, 0.24% of chromium, 0.21% of nickel, 0.16% of copper, 0.21% of phosphorus and 0.22% of sulfur are respectively selected according to the mass percentage of each component, and the balance is molten iron, then the carbon, the silicon, the manganese, the chromium, the nickel, the copper, the phosphorus, the sulfur and the molten iron are poured into a smelting furnace together, and the spring steel is smelted by a known method;
in the second step, the elastic bar steel refined in the first step is placed into a medium-frequency induction heating furnace, and is rapidly heated into molten liquid by utilizing induction current, so that elastic bar molten steel is prepared, wherein the operating frequency of the medium-frequency induction heating furnace is 900 Hz-21 kHz, and the heating temperature is 950-1150 ℃;
pouring the elastic strip molten steel prepared in the step two into a die casting machine, then injecting the elastic strip molten steel into a die casting die in a prefabricated shape, performing initial forging forming after die assembly, cooling and die opening, wherein the operating temperature of the die casting machine is 850-1100 ℃, the die assembly time is 8-15 min, then placing the elastic strip on a hot rolling mill, performing stretch bending rolling to obtain the prefabricated shape, and performing final forging forming to obtain the hot-rolled elastic strip;
in the fourth step, the hot-rolled elastic strip prepared in the third step is placed into a medium-frequency induction heating furnace, heat preservation and normalizing are carried out after heating, the normalizing temperature of the medium-frequency induction heating furnace is 855-875 ℃, then the medium-frequency induction heating furnace is immersed into cold quenching oil, rapid cooling quenching is carried out, the quenching temperature is 830-850 ℃, austenite is converted into martensite, and the quenched elastic strip is prepared;
in the fifth step, the quenched elastic strip prepared in the fourth step is subjected to constant-speed air cooling, the temperature is reduced to the intermediate temperature, then the heat preservation tempering is carried out, the tempering temperature of the intermediate frequency induction heating furnace is 415-465 ℃, the heat preservation time is 25-45 min, martensite is converted into troostite, and the tempered elastic strip is prepared;
in the sixth step, the tempered elastic strip prepared in the fifth step is cooled to normal temperature in a furnace, and then is placed into a shot blasting machine, the surface of the tempered elastic strip is impacted by utilizing a shot flow moving at high speed, so that a plastic circulating strain layer is generated on the surface of the tempered elastic strip, the surface microstructure and the residual compressive stress field are changed, and an elastic strip blank is prepared;
placing the elastic strip blank prepared in the step six into an ultrasonic cleaning machine, adding a proper amount of cleaning solution, wherein the cleaning solution is prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water, the weight ratio of the acetone to the phosphoric acid to the sodium hydroxide to the deionized water is 4: 2: 1: 8, removing impurities such as oil stains, scales and oxides remained on the surface of the elastic strip blank by utilizing ultrasonic oscillation, the operating frequency of the ultrasonic cleaning machine is 5-12 kHz, the cleaning time is 20-40 min, and taking out and draining after cleaning;
putting the elastic strip blank cleaned in the step seven into an electric arc ion plating machine, adding a proper amount of chromium target material fixing plate, vacuumizing, wherein the vacuum degree of the electric arc ion plating machine is-0.006 to-0.004 Pa, the operation temperature is 110-130 ℃, injecting a proper amount of nitrogen, generating high-density plasma after coupling glow discharge of the nitrogen, impacting the chromium target material fixing plate, enabling the nitrogen and impacted chromium atoms to pass through vacuum together, sputtering and depositing on the surface of the elastic strip blank, plating a chromium nitride film with a prefabricated thickness, and air-cooling to normal temperature to obtain an elastic strip semi-finished product;
placing the semi-finished product of the bullet strip prepared in the step eight on a quality inspection table, respectively detecting the size, the surface roughness, the hardness and other properties, performing a fatigue test, screening out unqualified defective products, and packaging qualified finished products into a warehouse to obtain the I-type bullet strip, wherein the qualified requirements of the I-type bullet strip are that the surface of the I-type bullet strip has no cracks and nicks and burrs, the metallographic structure is a uniform tempering troostite, the core part of the I-type bullet strip is allowed to have trace discontinuous ferrite, the total decarburization layer depth is 0-0.2 mm, the I-type bullet strip is not cracked after 500 ten thousand times of fatigue tests, the residual deformation is 0-1 mm, the hardness is 41-46 HRC, and the buckling pressure is 9-13 kN.
Example 3:
a type I bullet strip comprises the following formula: the alloy comprises carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, and the mass percentages of the components are as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus, 0.11-0.32% of sulfur and the balance of molten iron.
A processing technology of an I-shaped elastic strip comprises the following steps of preparing materials; step two, heating; step three, molding; step four, quenching; step five, tempering; step six, shot blasting; step seven, cleaning; step eight, coating a film; step nine, quality inspection;
in the first step, 0.64% of carbon, 2.1% of silicon, 0.8% of manganese, 0.33% of chromium, 0.30% of nickel, 0.23% of copper, 0.28% of phosphorus and 0.32% of sulfur are respectively selected according to the mass percentage of each component, and the balance is molten iron, then the carbon, the silicon, the manganese, the chromium, the nickel, the copper, the phosphorus, the sulfur and the molten iron are poured into a smelting furnace together, and the spring steel is smelted by a known method;
in the second step, the elastic bar steel refined in the first step is placed into a medium-frequency induction heating furnace, and is rapidly heated into molten liquid by utilizing induction current, so that elastic bar molten steel is prepared, wherein the operating frequency of the medium-frequency induction heating furnace is 900 Hz-21 kHz, and the heating temperature is 950-1150 ℃;
pouring the elastic strip molten steel prepared in the step two into a die casting machine, then injecting the elastic strip molten steel into a die casting die in a prefabricated shape, performing initial forging forming after die assembly, cooling and die opening, wherein the operating temperature of the die casting machine is 850-1100 ℃, the die assembly time is 8-15 min, then placing the elastic strip on a hot rolling mill, performing stretch bending rolling to obtain the prefabricated shape, and performing final forging forming to obtain the hot-rolled elastic strip;
in the fourth step, the hot-rolled elastic strip prepared in the third step is placed into a medium-frequency induction heating furnace, heat preservation and normalizing are carried out after heating, the normalizing temperature of the medium-frequency induction heating furnace is 855-875 ℃, then the medium-frequency induction heating furnace is immersed into cold quenching oil, rapid cooling quenching is carried out, the quenching temperature is 830-850 ℃, austenite is converted into martensite, and the quenched elastic strip is prepared;
in the fifth step, the quenched elastic strip prepared in the fourth step is subjected to constant-speed air cooling, the temperature is reduced to the intermediate temperature, then the heat preservation tempering is carried out, the tempering temperature of the intermediate frequency induction heating furnace is 415-465 ℃, the heat preservation time is 25-45 min, martensite is converted into troostite, and the tempered elastic strip is prepared;
in the sixth step, the tempered elastic strip prepared in the fifth step is cooled to normal temperature in a furnace, and then is placed into a shot blasting machine, the surface of the tempered elastic strip is impacted by utilizing a shot flow moving at high speed, so that a plastic circulating strain layer is generated on the surface of the tempered elastic strip, the surface microstructure and the residual compressive stress field are changed, and an elastic strip blank is prepared;
placing the elastic strip blank prepared in the step six into an ultrasonic cleaning machine, adding a proper amount of cleaning solution, wherein the cleaning solution is prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water, the weight ratio of the acetone to the phosphoric acid to the sodium hydroxide to the deionized water is 4: 2: 1: 8, removing impurities such as oil stains, scales and oxides remained on the surface of the elastic strip blank by utilizing ultrasonic oscillation, the operating frequency of the ultrasonic cleaning machine is 5-12 kHz, the cleaning time is 20-40 min, and taking out and draining after cleaning;
putting the elastic strip blank cleaned in the step seven into an electric arc ion plating machine, adding a proper amount of chromium target material fixing plate, vacuumizing, wherein the vacuum degree of the electric arc ion plating machine is-0.006 to-0.004 Pa, the operation temperature is 110-130 ℃, injecting a proper amount of nitrogen, generating high-density plasma after coupling glow discharge of the nitrogen, impacting the chromium target material fixing plate, enabling the nitrogen and impacted chromium atoms to pass through vacuum together, sputtering and depositing on the surface of the elastic strip blank, plating a chromium nitride film with a prefabricated thickness, and air-cooling to normal temperature to obtain an elastic strip semi-finished product;
placing the semi-finished product of the bullet strip prepared in the step eight on a quality inspection table, respectively detecting the size, the surface roughness, the hardness and other properties, performing a fatigue test, screening out unqualified defective products, and packaging qualified finished products into a warehouse to obtain the I-type bullet strip, wherein the qualified requirements of the I-type bullet strip are that the surface of the I-type bullet strip has no cracks and nicks and burrs, the metallographic structure is a uniform tempering troostite, the core part of the I-type bullet strip is allowed to have trace discontinuous ferrite, the total decarburization layer depth is 0-0.2 mm, the I-type bullet strip is not cracked after 500 ten thousand times of fatigue tests, the residual deformation is 0-1 mm, the hardness is 41-46 HRC, and the buckling pressure is 9-13 kN.
The type I bullets obtained in the above examples were tested separately, and the common type I bullets on the market were used as a control, and the obtained data are as follows:
| tensile strength/MPa | Yield strength/MPa | hardness/HRC | Withholding force/kN | |
| Comparative example | 1280 | 1190 | 41 | 9 |
| Example 1 | 1466 | 1315 | 44 | 11 |
| Example 2 | 1492 | 1374 | 45 | 12 |
| Example 3 | 1515 | 1433 | 46 | 13 |
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the chromium nitride film is plated on the surface of the I-shaped elastic strip subjected to shot blasting rust prevention treatment, so that the hardness and the corrosion resistance of the I-shaped elastic strip are improved, the damage amount of the I-shaped elastic strip in a severe environment is reduced, the service life of the I-shaped elastic strip is prolonged, and the maintenance cost of a traffic track is saved; the cleaning solution prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water is used for carrying out ultrasonic cleaning on the I-shaped elastic strip, so that impurities such as residual oil stains, accumulated scale and oxides on the surface of the I-shaped elastic strip are thoroughly removed, the adhesion strength of the chromium nitride film is improved, the smoothness, cleanness and brightness of the surface of the I-shaped elastic strip are ensured, and the processing precision of the I-shaped elastic strip is improved.
It is noted that, herein, relational terms such as first and second, and the like may be 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. Also, 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.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A type I bullet strip comprises the following formula: carbon, silicon, manganese, chromium, nickel, copper, phosphorus, sulfur and molten iron, which is characterized in that: the weight percentages of the components are respectively as follows: 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus, 0.11-0.32% of sulfur and the balance of molten iron.
2. A processing technology of an I-shaped elastic strip comprises the following steps of preparing materials; step two, heating; step three, molding; step four, quenching; step five, tempering; step six, shot blasting; step seven, cleaning; step eight, coating a film; step nine, quality inspection; the method is characterized in that:
in the first step, according to the mass percent of each component, 0.56-0.64% of carbon, 1.5-2.1% of silicon, 0.6-0.8% of manganese, 0.15-0.33% of chromium, 0.12-0.30% of nickel, 0.09-0.23% of copper, 0.13-0.28% of phosphorus and 0.11-0.32% of sulfur are respectively selected, the balance is molten iron, then the carbon, the silicon, the manganese, the chromium, the nickel, the copper, the phosphorus, the sulfur and the molten iron are poured into a smelting furnace together, and the elastic bar steel is smelted by a known method;
in the second step, the steel bar of the elastic strip smelted in the first step is put into a medium-frequency induction heating furnace, and is rapidly heated into molten liquid by utilizing induction current, so that molten steel of the elastic strip is prepared;
pouring the molten steel of the elastic strip prepared in the step two into a die casting machine, then injecting the molten steel into a die casting die in a prefabricated shape, performing primary forging forming after die assembly, cooling and die opening, then placing the die casting die on a hot rolling machine, performing stretch bending rolling to obtain the prefabricated shape, and performing final forging forming to obtain the hot-rolled elastic strip;
in the fourth step, the hot-rolled elastic strip prepared in the third step is placed into a medium-frequency induction heating furnace, is heated, is subjected to heat preservation and normalizing, is immersed into cold quenching oil, and is rapidly cooled and quenched to convert austenite into martensite, so that a quenched elastic strip is prepared;
in the fifth step, the quenched elastic strip prepared in the fourth step is subjected to constant-speed air cooling, and is cooled to the intermediate temperature and then is subjected to heat preservation and tempering, so that martensite is converted into troostite, and the tempered elastic strip is prepared;
in the sixth step, the tempered elastic strip prepared in the fifth step is cooled to normal temperature in a furnace, and then is placed into a shot blasting machine, the surface of the tempered elastic strip is impacted by utilizing a shot flow moving at high speed, so that a plastic circulating strain layer is generated on the surface of the tempered elastic strip, the surface microstructure and the residual compressive stress field are changed, and an elastic strip blank is prepared;
putting the elastic strip blank prepared in the step six into an ultrasonic cleaning machine, adding a proper amount of cleaning solution, removing impurities such as oil stains, scales and oxides remained on the surface of the elastic strip blank by utilizing ultrasonic oscillation, cleaning, taking out and draining;
putting the elastic strip blank cleaned in the step seven into an electric arc ion plating machine, adding a proper amount of chromium target material fixing plate, vacuumizing, injecting a proper amount of nitrogen, generating high-density plasma after coupling glow discharge of the nitrogen, impacting the chromium target material fixing plate, enabling the nitrogen and the impacted chromium atoms to pass through vacuum, sputtering and depositing on the surface of the elastic strip blank, plating a chromium nitride film with a prefabricated thickness, and air-cooling to normal temperature to obtain an elastic strip semi-finished product;
and step nine, placing the semi-finished product of the elastic strip manufactured in the step eight on a quality inspection table, respectively detecting various performances such as size, surface roughness and hardness, performing fatigue tests, screening out unqualified defective products, and packaging qualified finished products into a warehouse to obtain the I-type elastic strip.
3. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the second step, the operating frequency of the medium-frequency induction heating furnace is 900Hz to 21kHz, and the heating temperature is 950 to 1150 ℃.
4. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the third step, the operating temperature of the die casting machine is 850-1100 ℃, and the die closing time is 8-15 min.
5. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the fourth step, the normalizing temperature of the medium-frequency induction heating furnace is 855-875 ℃, and the quenching temperature is 830-850 ℃.
6. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the fifth step, the tempering temperature of the medium-frequency induction heating furnace is 415-465 ℃, and the heat preservation time is 25-45 min.
7. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the seventh step, the operation frequency of the ultrasonic cleaning machine is 5-12 kHz, and the cleaning time is 20-40 min.
8. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: and in the seventh step, the cleaning solution is prepared by mixing acetone, phosphoric acid, sodium hydroxide and deionized water, and the weight ratio of the acetone to the phosphoric acid to the sodium hydroxide to the deionized water is 4: 2: 1: 8.
9. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the eighth step, the vacuum degree of the arc ion plating machine is-0.006 to-0.004 Pa, and the operating temperature is 110 to 130 ℃.
10. The processing technology of the I-shaped elastic strip according to claim 2, characterized in that: in the ninth step, the I-shaped elastic strip has the qualified requirements that the surface has no crack nicks and burrs, the metallographic structure is uniform tempered troostite, the center of the I-shaped elastic strip is allowed to have trace intermittent ferrite, the total decarburized layer depth is 0-0.2 mm, the I-shaped elastic strip does not crack after 500 ten thousand fatigue tests, the residual deformation is 0-1 mm, the hardness is 41-46 HRC, and the buckling pressure is 9-13 kN.
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