CN114734000A - Method for precisely casting hook head of high-speed rail motor car - Google Patents
Method for precisely casting hook head of high-speed rail motor car Download PDFInfo
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- CN114734000A CN114734000A CN202210429212.6A CN202210429212A CN114734000A CN 114734000 A CN114734000 A CN 114734000A CN 202210429212 A CN202210429212 A CN 202210429212A CN 114734000 A CN114734000 A CN 114734000A
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- 238000005266 casting Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000004576 sand Substances 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 239000006260 foam Substances 0.000 claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000004033 plastic Substances 0.000 claims abstract description 15
- 229920003023 plastic Polymers 0.000 claims abstract description 15
- 239000000126 substance Substances 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 12
- 230000003746 surface roughness Effects 0.000 claims abstract description 9
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 244000035744 Hura crepitans Species 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims abstract description 6
- 238000000576 coating method Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 5
- 238000004088 simulation Methods 0.000 claims abstract description 5
- 238000007605 air drying Methods 0.000 claims abstract description 4
- 238000009415 formwork Methods 0.000 claims description 16
- 239000010410 layer Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 12
- 229910052845 zircon Inorganic materials 0.000 claims description 12
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 9
- 229910052863 mullite Inorganic materials 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 239000002861 polymer material Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 2
- 238000005495 investment casting Methods 0.000 claims description 2
- 238000010791 quenching Methods 0.000 abstract description 2
- 230000000171 quenching effect Effects 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract 1
- 238000005496 tempering Methods 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000007528 sand casting Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/02—Lost patterns
- B22C7/023—Patterns made from expanded plastic materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- 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
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
-
- 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
- C22C38/04—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- 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
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
Abstract
The invention relates to a bullet train hook head accessory, and provides a method for precisely casting a high-speed rail bullet train hook head, which mainly comprises the following process flows of: design casting mold → MAGMA simulation → lost foam manufacturing → mold manufacturing → roasting → smelting → control component → deoxidation → sand filling and pouring → heat treatment → physical and chemical detection → nondestructive detection → weld repair → final detection. The key process is characterized in that the key process is to manufacture a lost foam: the hook head model is made of foam plastics; preparing a mould shell: coating a silica sol binder on a model and air-drying to form a mould shell; roasting: heating the mould shell to gasify the foamed plastic to obtain a hollow mould shell; sand culture and pouring: placing the cavity mould shell into a sand box for sand culture and then pouring; and (3) heat treatment: the casting is a new material ZG25CrMoV, water-cooling quenching is carried out at 920 +/-14 ℃, air-cooling tempering is carried out at 680 +/-14 ℃, and the physical and chemical properties are as follows: 0.12 to 0.26 percent of C, 0.30 to 0.60 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.05 to 0.10 percent of V, and less than or equal to 0.7 percent of CE; the mechanical property Rm is 700MPa, Rp0.2 is more than or equal to 600MPa, A is more than or equal to 20 percent, and HB is less than or equal to 285 HBW. The finished casting has high dimensional precision, small form and position tolerance and low surface roughness.
Description
Technical Field
The invention relates to a new low alloy steel material ZG25CrMoV for a coupler head of a high-speed railway motor car, and provides a method for precisely casting the coupler head of the high-speed railway motor car. The physical and chemical properties of the casting are realized: the chemical components are 0.12 to 0.26 percent of C, 0.30 to 0.60 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.05 to 0.10 percent of V and less than or equal to 0.70 percent of CE; the mechanical property Rm is more than or equal to 700MPa, Rp0.2 is more than or equal to 600MPa, A is more than or equal to 20 percent, and HB is less than or equal to 285 HBW. The dimensional accuracy of the finished casting is not lower than the national standard GB/T6414DCTG8The surface roughness is less than or equal to Ra6.3, and the form and position tolerance is ensured to meet the specification of a drawing. Improving the strength and hardenability.
Background
The international advanced high-speed rail motor car coupler head belongs to high-end equipment, the size precision of a motor car coupler head casting is not lower than DCTG8, the surface roughness is not more than Ra6.3, the position tolerance on a drawing is specified, the strength is required to be higher, the hardenability is good, and the service life is long. A ZG25CrMoV new material is selected to realize the physical and chemical properties of the casting: the chemical components are 0.12 to 0.26 percent of C, 0.30 to 0.60 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.05 to 0.10 percent of V and less than or equal to 0.70 percent of CE; the mechanical property Rm is more than or equal to 700MPa, Rp0.2 is more than or equal to 600MPa, A is more than or equal to 20 percent, and HB is less than or equal to 285 HBW. Because the hook head casting is large in size and nearly 100 kilograms in weight, the size precision is not lower than the national standard GB/T6414DCTG8, the surface roughness is not more than Ra6.3 and the form and position tolerance meets the requirements of the drawing specification in the casting industry. Although the precision casting can ensure that the dimensional accuracy is not lower than the national standard GB/T6414DCTG 9, the surface roughness is not more than Ra6.3 and the form and position tolerance meets the requirements specified by the drawing, the wax making is difficult, the deformation is large, the strength is low and the wax is easy to damage. And the qualified high-speed rail motor car hook head casting is difficult to produce through sand casting and fine casting.
Disclosure of Invention
The invention aims to manufacture a coupler head casting of a high-speed rail motor car, the material of the coupler head casting is ZG25CrMoV, and in order to have higher strength and good quenching performance, the invention provides a method for precisely casting the coupler head of the high-speed rail motor car, which is key to manufacture a lost foam: simulating a lost foam of a hook head casting by using a high polymer foam plastic material; preparing a mould shell: coating silica sol slurry on a lost foam to prepare a thin type formwork; roasting: heating a mould shell to gasify the foamed plastic in a roasting furnace to obtain a hollow mould shell; drying sand and pouring at the temperature of the mould shell of more than 600 ℃: the red-forking cavity formwork is placed into a sand box to be poured after sand is dried, so that the number of the layers of the formwork is reduced, the production cost is reduced, and the phenomena that shell-breaking molten steel flows out and a casting is scrapped are avoided.
The technical scheme of the invention is as follows: a method for precisely casting a coupler head of a high-speed rail motor car comprises the following main process flows: designing a casting mold → MAGMA simulation → making a lost foam → making a mold shell → roasting → smelting → controlling components → deoxidizing → pouring dry sand, heat treatment → physicochemical detection → nondestructive detection → welding repair → final detection, and innovating in the method that the material selected for making the lost foam is used for determining main process parameters of the processes of making the mold shell, roasting, pouring dry sand and heat treatment. Manufacturing a lost foam: the foam plastic is a high polymer material formed by dispersing a large number of gas micropores in solid plastic, such as polyurethane, polystyrene, polyvinyl chloride, polyethylene, phenolic aldehyde and the like, and is called foam plastic for short; is a ZL104 aluminum alloy machine molding provided by Henan sky fine mold GmbH, the name of the mold is as follows: GG81577, typing protocol: integrally molding, wherein the size of a mold is 965 to 470 mm; compared with a wax pattern, the artificial gib head casting for manufacturing the lost foam has the advantages of light weight, high specific strength, capability of absorbing impact load and difficulty in damage; preparing a mould shell: coating silica sol slurry on an evaporative pattern, using a trade mark HG/T2521 JN-30 for the silica sol, using 325-mesh zircon powder for a surface layer, using powder-liquid ratio of 3.8-4.7, scattering 80/120-mesh zircon sand, using 200-mesh zircon powder for a transition layer, using powder-liquid ratio of 3.4-4.2, scattering 30/60-mesh zircon sand, using 200-mesh mullite powder for a back layer, using 2.0-2.4, scattering 16/30-mesh mullite sand, using 200-mesh mullite powder for a sealing slurry layer, using 1.5-1.7, repeatedly scattering sand, bonding and air-drying to form a thin type mould shell; roasting: heating the formwork in a roasting furnace to 1000-1050 ℃, and gasifying the foamed plastic to obtain a hollow formwork; drying sand and pouring at the temperature of the mould shell of more than 600 ℃: because the casting is large in size and nearly 100 kilograms in weight, the red-fork cavity formwork is placed into a sand box to be poured after sand is dried, so that the number of the formwork layers is reduced, the production cost is reduced, and the phenomena that shell-breaking molten steel flows out and the casting is scrapped are avoided. And (3) heat treatment: as the casting is a new material ZG25CrMoV, an intelligent cover type fiber resistance furnace with the rated temperature of 1200 ℃ of 5 tons is used, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 920 +/-14 ℃, the heat preservation is more than or equal to 2h, the cooling is more than or equal to 15min when the water temperature is less than or equal to 40 ℃, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 680 +/-14 ℃, the heat preservation is more than or equal to 3h, and the casting is taken out of the furnace and cooled with the furnace to 500 ℃ for air cooling. Physical and chemical properties: the chemical components are 0.12 to 0.26 percent of C, 0.30 to 0.60 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.05 to 0.10 percent of V and less than or equal to 0.70 percent of CE; the mechanical property Rm is more than or equal to 700MPa, Rp0.2 is more than or equal to 600MPa, A is more than or equal to 20 percent, and HB is less than or equal to 285 HBW. The size precision of the finished casting is not lower than the national standard GB/T6414DCTG8, the surface roughness is 3.2-6.3 um, and the form and position tolerance is ensured to meet the specification of a drawing.
Brief description of the drawings
FIG. 1 is a three-dimensional view of a casting
1. And (5) casting.
FIG. 2 is a front view of the lost foam
2. And (4) eliminating the mold.
FIG. 3 is a front view of the pouring device
3. A mould shell, 4, dry sand, 5 and a sand box.
The invention has the positive effects that:
the method has the advantages of achieving the effect of fine casting of the medium-temperature wax silica sol, ensuring that the size precision of the casting is not lower than the national standard GB/T6414DCTG8, ensuring that the surface roughness is 3.2-6.3 um, ensuring that the form and position tolerance meets the requirements of the specification of the drawing, and ensuring that the shape is regular and the inner surface and the outer surface are smooth and clean.
Detailed Description
The invention provides a method for manufacturing a coupler head casting of a high-speed rail motor car, which is characterized in that the material of the coupler head casting is a new low-alloy steel material ZG25CrMoV, and the method comprises the following main implementation process flows: design casting 1 mould → MAGMA simulation → disappearance mould 2 → mould shell 3 → roasting → smelting → control component → deoxidation → dry sand 4 pouring → heat treatment → physical and chemical detection → nondestructive detection → weld repair → final detection. The method is applied to design a casting 1 mould and a process system according to customer drawings, and a MAGMA simulation verification process is used for manufacturing a lost foam 2, wherein polyurethane, polystyrene, polyvinyl chloride, polyethylene, phenolic aldehyde and the like are used, a large number of gas micropores are dispersed in solid plastic to form a high polymer material, namely foam plastic for short, and the model is manufactured by a ZL104 aluminum alloy machine provided by Henan Tanshini Fine engineering mould company Limited, and is named as follows: GG81577, typing protocol: integrally molding, wherein the size of a mold is 965 to 470 mm; the artificial gib head casting 1 is made into the lost foam 2, and compared with a wax pattern, the artificial gib head casting has the advantages of light weight, high specific strength, capability of absorbing impact load and difficulty in damage; coating silica sol slurry on an evaporative pattern 2, wherein the silica sol slurry is prepared by using a trademark HG/T2521 JN-30, 325-mesh zircon powder is used for a surface layer, the powder-liquid ratio is 3.8-4.7, 80/120-mesh zircon sand is scattered, 200-mesh zircon powder is used for a transition layer, the powder-liquid ratio is 3.4-4.2, 30/60-mesh zircon sand is scattered, 200-mesh mullite powder is used for a back layer, the powder-liquid ratio is 2.0-2.4, 16/30-mesh mullite sand is scattered, 200-mesh mullite powder is used for a sealing layer, the powder-liquid ratio is 1.5-1.7, and repeatedly scattering, bonding and air-drying are carried out to form a thin type mould shell 3; the roasting is to heat the formwork 3 to 1000-1050 ℃ in a roasting furnace, and gasify the foamed plastic to obtain a cavity formwork 3; smelting: melting molten steel by using a 1-2 ton intermediate frequency furnace, after chemical components are measured to meet internal control standards, carrying out final deoxidation by using pure aluminum, tapping at 1620 ℃, pouring into a casting ladle, standing for 0.5-1 min, and pouring sand 4 at the temperature of more than 600 ℃ in a mould shell 3: because the casting is large in size and the weight is nearly 100 kilograms, the number of the layers of the formwork 3 is reduced, the production cost is reduced, and the phenomena that shell-breaking molten steel flows out and the casting is scrapped are avoided. Putting the red fork cavity formwork 3 into a sand box 5, drying sand 4, and pouring molten steel into the cavity formwork 3. And (3) heat treatment: as the casting is a new material ZG25CrMoV, a 5-ton intelligent cover type fiber resistance furnace is used, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 920 +/-14 ℃, the heat preservation is more than or equal to 2h, the cooling is carried out for more than or equal to 15min at the water temperature of less than or equal to 40 ℃, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 680 +/-14 ℃, the heat preservation is more than or equal to 3h, and the casting is taken out of the furnace and cooled to 500 ℃ along with the furnace. Physical and chemical detection: chemical components: 0.122% of C, 0.5030% of Si, 1.51% of Mn, 0.019% of P, 0.011% of S, 0.059% of Cr, 0.266% of Mo, 0.026% of Ni, 0.07% of V, 0.036% of Al and 0.457% of CE. The mechanical property Rm 751MPa, Rp0.2 637MPa, A24% and HB 255 HBW. The size precision of the finished casting is not lower than the national standard GB/T6414DCTG8, the surface roughness is 3.2-6.3 um, and the form and position tolerance is ensured to meet the specification of a drawing. If the defects exist after PT, MT and RT are adopted in nondestructive testing, a carbon rod gouging plane is used for eliminating the defects, the defects of the casting are preheated to 150 ℃ for repair welding, the repair welding stress is eliminated by heating at the heating speed of less than or equal to 150 ℃/h, the casting is heated to 640 +/-10 ℃ for one time, the temperature is kept for more than or equal to 3h, and the casting is taken out of the furnace and cooled to 500 ℃ along with the furnace. And roughly machining the surface needing to be machined. Final inspection: mainly comprises the steps of detecting the three-dimensional size, the form and position tolerance and the surface precision to meet the technical requirements of drawings, and coating anti-rust oil for warehousing.
Claims (3)
1. A method for precisely casting a coupler head of a high-speed rail motor car is characterized by comprising the following main process flows: the method is characterized in that a casting (1) is designed, a mold is designed → MAGMA simulation → a model shell (3) is manufactured → roasting → smelting → control component → deoxidation → pouring of drying sand (4), heat treatment → physical and chemical detection → nondestructive detection → weld repair → final inspection, and the innovation lies in that the material selected for manufacturing the drying sand (2) is used for determining main process parameters in the processes of mold shell manufacturing, roasting, sand (4) pouring and heat treatment.
2. A method for the precision casting of a high-speed railway car coupler head according to claim 1, characterized in that the lost foam (2): the foam plastic is a high polymer material formed by dispersing a large number of gas micropores in solid plastic, such as polyurethane, polystyrene, polyvinyl chloride, polyethylene, phenolic aldehyde and the like, and is called foam plastic for short; compared with a wax pattern, the artificial gib head casting (1) is used for manufacturing the lost foam (2) and has the advantages of light weight, high specific strength, capability of absorbing impact load and difficulty in damage; a mould making shell (3): coating silica sol slurry on an evaporative pattern (2), wherein the surface layer is made of 325-mesh zircon powder, the powder-liquid ratio is 3.8-4.7, 80/120-mesh zircon sand is scattered, the transition layer is made of 200-mesh zircon powder, the powder-liquid ratio is 3.4-4.2, 30/60-mesh zircon sand is scattered, the back layer is made of 200-mesh mullite powder, the powder-liquid ratio is 2.0-2.4, 16/30-mesh mullite sand is scattered, the slurry sealing layer is made of 200-mesh mullite powder, the powder-liquid ratio is 1.5-1.7, and repeatedly scattering sand, bonding and air-drying are carried out to form a thin type mould shell (3); roasting: heating the formwork (3) in a roasting furnace to 1000-1050 ℃, and gasifying the foamed plastic to obtain a hollow formwork (3); the mould shell (3) is dried at the temperature of more than 600 ℃ and sand (4) is poured: because the casting is large in size and nearly 100 kilograms in weight, the red-fork cavity formwork (3) is placed into a sand box (5) to dry sand (4) and then poured, so that the number of layers of the formwork (3) is reduced, the production cost is reduced, and the phenomena that shell-breaking molten steel flows out and the casting is scrapped are avoided.
3. The method for finely casting the coupler head of the high-speed railway car according to claim 1, wherein the heat treatment comprises the following steps: because the casting (1) is a new material ZG25CrMoV, a 5-ton intelligent cover type fiber resistance furnace with the rated temperature of 1200 ℃ is used, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 920 +/-14 ℃, the heat preservation is more than or equal to 2h, the cooling is more than or equal to 15min in the temperature of water less than or equal to 40 ℃, the heating speed is less than or equal to 150 ℃/h, the heating is carried out to 680 +/-14 ℃, the heat preservation is more than or equal to 3h, and the casting is taken out of the furnace and cooled with the furnace to 500 ℃ for air cooling. Physical and chemical properties: the chemical components are 0.12 to 0.26 percent of C, 0.30 to 0.60 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, less than or equal to 0.30 percent of Cr, 0.20 to 0.40 percent of Mo, 0.05 to 0.10 percent of V and less than or equal to 0.70 percent of CE; the mechanical property Rm is 700MPa, Rp0.2 is more than or equal to 600MPa, A is more than or equal to 20 percent, and HB is less than or equal to 285 HBW. The dimensional accuracy of the finished casting (1) is not lower than the national standard GB/T6414DCTG8, the surface roughness is less than or equal to Ra6.3, and the form and position tolerance is ensured to meet the specification of a drawing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210429212.6A CN114734000A (en) | 2022-04-22 | 2022-04-22 | Method for precisely casting hook head of high-speed rail motor car |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210429212.6A CN114734000A (en) | 2022-04-22 | 2022-04-22 | Method for precisely casting hook head of high-speed rail motor car |
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| CN114734000A true CN114734000A (en) | 2022-07-12 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101590513A (en) * | 2009-07-03 | 2009-12-02 | 郑州神牛铸造有限公司 | Method for evaporative pattern precise composite casting |
| CN102230131A (en) * | 2011-06-29 | 2011-11-02 | 江苏环立板带轧辊有限公司 | 38CrMoAl steel and preparation method thereof |
| CN104972066A (en) * | 2015-06-15 | 2015-10-14 | 江苏万恒铸业有限公司 | Thin-shell sand culturing casting simple technology |
| CN206527326U (en) * | 2016-12-24 | 2017-09-29 | 江苏万恒铸业有限公司 | One 1 grade of seed nucleus impeller of pump formwork centrifugal casting device |
| CN107716861A (en) * | 2017-09-01 | 2018-02-23 | 东风精密铸造安徽有限公司 | A kind of lost foam casting process of transmission housing |
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2022
- 2022-04-22 CN CN202210429212.6A patent/CN114734000A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101590513A (en) * | 2009-07-03 | 2009-12-02 | 郑州神牛铸造有限公司 | Method for evaporative pattern precise composite casting |
| CN102230131A (en) * | 2011-06-29 | 2011-11-02 | 江苏环立板带轧辊有限公司 | 38CrMoAl steel and preparation method thereof |
| CN104972066A (en) * | 2015-06-15 | 2015-10-14 | 江苏万恒铸业有限公司 | Thin-shell sand culturing casting simple technology |
| CN206527326U (en) * | 2016-12-24 | 2017-09-29 | 江苏万恒铸业有限公司 | One 1 grade of seed nucleus impeller of pump formwork centrifugal casting device |
| CN107716861A (en) * | 2017-09-01 | 2018-02-23 | 东风精密铸造安徽有限公司 | A kind of lost foam casting process of transmission housing |
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