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Strong force rotary pressing molding method of nanocrystalline/superfine crystal carbon steel cylindrical piece

A technology of strong spinning and cylindrical parts, which is applied in the strong spinning forming of nanocrystalline/ultrafine-grained carbon steel cylindrical parts, and the field of nano/ultrafine-grained materials.

Active Publication Date: 2014-11-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the low-carbon steel thin-walled cylindrical metal parts widely used in actual engineering, due to the small thickness, the service environment of the inner and outer surfaces of the parts and the interior of the material are very close, and the surface nanotechnology can no longer meet the use requirements.

Method used

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  • Strong force rotary pressing molding method of nanocrystalline/superfine crystal carbon steel cylindrical piece
  • Strong force rotary pressing molding method of nanocrystalline/superfine crystal carbon steel cylindrical piece
  • Strong force rotary pressing molding method of nanocrystalline/superfine crystal carbon steel cylindrical piece

Examples

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Effect test

Embodiment 1

[0042] A low-carbon steel metal thin-walled cylindrical part, the material is 10 steel (0.1% carbon content), the shape is as figure 1 As shown, the diameter of the inner cavity of the cylindrical piece is d=68mm, the wall thickness δ=0.6mm, and the length l=1000mm. In addition to shape requirements, it is also necessary to obtain an ultrafine-grained microstructure with a grain size of less than 1 μm.

[0043] 1. Since the specifications can be purchased in the market as The seamless steel pipe, the diameter of the inner cavity of the cylindrical part is d=68mm, and the wall thickness is Δ=4mm. If the seamless steel pipe of this specification is used to form the part, the wall thickness should be reduced from 4mm to 0.6mm, and the thinning rate is 85%. Therefore, the part is intended to pass through the seamless steel pipe blank (such as Figure 4 shown) processed by multi-pass spinning forming and recrystallization treatment (such as Figure 8 shown). The raw material ...

Embodiment 2

[0051] A low-carbon steel metal thin-walled cylindrical part, the material is 10 steel (0.1% carbon content), the shape is as figure 1 As shown, the diameter of the inner cavity of the cylindrical piece is d=69mm, the wall thickness δ=0.6mm, and the length l=1000mm. In addition to shape requirements, it is also necessary to obtain an ultrafine-grained microstructure with a grain size of less than 1 μm.

[0052] 1. The inner diameter of this part is d=69mm. There is no similar seamless steel pipe on the market. Figure 5 shown) as a spinning blank, and then processed by multi-pass spinning forming and recrystallization treatment (such as Figure 8 shown). The tube raw material is in an annealed state, its grain shape is equiaxed, and its grain size is 30-50 μm, such as Figure 9 shown.

[0053] The wall thickness of the cup-shaped blank is determined to be Δ=4mm according to the requirement of a total thinning rate of 85%. Therefore, a steel plate with a thickness of the cu...

Embodiment 3

[0059] A low-carbon steel metal thin-walled cylindrical part, the material is 25 steel (0.25% carbon content), the shape is as figure 1 As shown, the diameter of the inner cavity of the wall cylindrical part is d=140mm, the wall thickness δ=0.5mm, and the length l=500mm. In addition to shape requirements, it is also necessary to obtain an ultrafine-grained microstructure with a grain size of less than 1 μm.

[0060] 1. Since the specifications can be purchased in the market as seamless steel pipe, the inner diameter of the seamless steel pipe is d=140mm, and the wall thickness of the seamless steel pipe is Δ=5mm. If the seamless steel pipe of this specification is used to form the part, the wall thickness should be reduced from 5mm to 0.5mm, and the thinning rate is 90%. Therefore, the part is intended to pass through the seamless steel pipe blank (such as Figure 4 shown) processed by multi-pass spinning forming and recrystallization treatment (such as Figure 8 shown). ...

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Abstract

The invention discloses a strong force rotary pressing molding method of a nanocrystalline / superfine crystal carbon steel cylindrical piece. The method comprises the following steps of: prefabricating a weld joint free cylindrical or cup-shaped blank in accordance with the invariant material volume principle and the requirements that a workpiece has 85-90% of total thickness reduction during the transformation process according to the size of a metal cylindrical part; subsequently sleeving the blank on a core mold; making the wall thickness reduction achieve 60-70% through multiple separation spinning; further putting the workpiece into an inert gas shielding furnace for recrystallization treatment; and finally sleeving the workpiece on the core mold again, wherein the total wall thickness reduction achieves 85-90% due to the multiple separation spinning. The method aims at the fact that a low carbon steel thin wall cylindrical part not only has a high precision appearance size, but also an overall but not surface superfine crystal / nanocrystallization microcosmic crystal grain structure, so that the cylindrical part has a good overall mechanical property.

Description

technical field [0001] The invention relates to a nano / ultra-fine crystal material, in particular to a powerful spinning forming method for a nano-crystal / ultra-fine crystal carbon steel cylinder, belonging to the field of plastic forming of metal materials. Background technique [0002] Ultrafine crystal / nano material is an important development direction of nano science and technology. The characteristic dimension of grains of ultra-fine-grained materials is below the micron level (100nm to 1000nm), and the characteristic dimension of grains of nanomaterials is on the order of nanometers (1nm to 100nm). Due to the extremely fine grains, a large number of central atoms in the grain boundaries and defects in the grains, and its own quantum size effect, small size effect, surface effect and macroscopic quantum tunneling effect, ultrafine grain / nanomaterials and the same composition Compared with conventional micron crystal materials, it has many exotic properties in catalysi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21D22/14
Inventor 夏琴香程秀全
Owner SOUTH CHINA UNIV OF TECH
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