Thermal formation method of component with complex shape through martensitic steel board

A martensitic steel and complex shape technology, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems that it is difficult to achieve rapid and uniform quenching of martensitic steel, large mold loss, and inability to form, and achieve high The effect of engineering application value, improving component strength and reducing manufacturing cost

Active Publication Date: 2017-04-26
NANJING INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hot stamping process requires a combined mold of the die and the punch, and the die loss is large at high temperature, and the cost of the die is high; at the same time, when the plate is plastically deformed through the rigid die, it is easy to cause failure behaviors such as cracking, and the failure to form is more complicated. The shape, especially the components with stamping negative angle; not only that, although through the optimized design of the mold cooling system, it is still difficult to achieve rapid and uniform quenching of martensitic steel, and the martensitic transformation rate is low

Method used

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  • Thermal formation method of component with complex shape through martensitic steel board
  • Thermal formation method of component with complex shape through martensitic steel board
  • Thermal formation method of component with complex shape through martensitic steel board

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Experimental program
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Effect test

Embodiment 1

[0030] Embodiment one: with reference to attached figure 1 , 2 , Shown in 3, a kind of hot forming method of complex shape member of martensitic steel plate, comprises the following steps:

[0031] 1) Punching: Select a 0.8mm thick 40CrNiMo uncoated martensitic steel sheet and punch it to 500mm×300mm;

[0032] 2) Austenitization: Heating to 930°C through 4 zones of electric and gas mixing, using nitrogen protection, and keeping the temperature for 60s to austenitize the slab;

[0033] The advantages of using the electric hybrid heating method in the present invention are: the cost of gas heating is low, and the temperature control is not accurate; Electric hybrid heating method; through partitions, gas heating is used in the front to heat the material quickly, which is more energy-saving; electric heating is used in the rear to accurately control the heating temperature of the plate to ensure production quality. The more partitions, the better the energy-saving effect, so 4 ...

Embodiment 2

[0041] Embodiment two: with reference to attached figure 1 , 2 , Shown in 4, a kind of hot forming method of martensitic steel plate complex shape member, comprises the following steps:

[0042] 1) Punching: Select a 1.5mm thick 30CrMnSiNi2A martensitic steel plate with zinc-nickel coating, and punch it to 600mm×200mm;

[0043] 2) Austenitization: Heating to 940°C through 6 zones of electric and gas mixing, using nitrogen protection, and keeping the temperature for 200s to austenitize the slab;

[0044] 3) Pneumatic forming: put the austenitized 30CrMnSiNi2A steel plate in the pneumatic forming device, close the mold and apply the clamping force, the clamping force ranges from 50 KN to 300KN, and the controlled slab can be partially fed during the forming process ;

[0045] When the temperature of the slab is controlled to not be lower than 720°C, the upper surface of the steel plate is loaded with pulsating air pressure, the amplitude is 10MPa, the frequency is 150n / min un...

Embodiment 3

[0048]Embodiment three: with reference to attached figure 1 , 2 , Shown in 5, a kind of hot forming method of martensitic steel plate complex shape member, comprises the following steps:

[0049] 1) Punching: Select 1mm thick 22MnB5 martensitic steel plate with aluminum-silicon coating, and punch it to 700mm×500mm;

[0050] 2) Austenitization: Heating to 950°C through 6 zones of electric and gas mixing, using nitrogen protection, and holding for 150s to austenitize the slab;

[0051] 3) Pneumatic forming: put the austenitized 22MnB5 steel plate in the pneumatic forming device, close the mold and apply the clamping force, the clamping force ranges from 50 KN to 300KN, and the slab can be fully fed during the forming process ;

[0052] When the temperature of the slab is controlled to not be lower than 750°C, the upper surface of the steel plate is loaded with pulsating air pressure, the amplitude is 30MPa, the frequency is 50n / min until the steel plate is completely attached...

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Abstract

The invention discloses a thermal formation method of a component with complex shape through a martensitic steel board, and belongs to the field of advanced manufacturing and plastic formation of metal. The thermal formation method comprises the following steps: heating a martensitic steel sheet to reach the temperature of 930 to 950 DEG C in order to realize austenitizing; placing the austenitized steel sheet in a pneumatic formatting device; closing a die, and applying a certain die closing force; performing pulse pneumatic loading formation on the surface of the steel sheet until the surface of the steel sheet clings to a concave die so as to obtain the component with the complex shape; quickly quenching the component through a cooling system which is integrated with the die, so as to completely convert austenite into martensite; and performing laser hole punching and side cutting on the formed component so as to obtain the final martensite component. With the adoption of the thermal formation method, the problem of formation of the component with complex shape through an ultrahigh-strength martensite steel sheet can be effectively solved; the conversion rate of a martensite structure in the component can be further increased; the manufacturing cost of martensite steel can be decreased; and the thermal formation method is high in formation efficiency and high in engineering application value.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a pulsating air pressure forming method of an ultra-high-strength martensitic steel plate. Background technique [0002] Under the background of structural weight reduction and light weight, the fields of aviation, automobile and rail transit have put forward higher requirements for the structural design and performance of materials. On the one hand, the material is required to have higher specific strength and specific stiffness; on the other hand, it is required to realize the integrated forming of complex shapes to meet the requirements of functional design and further reduce the weight of the structure. [0003] Martensitic steel is a kind of ultra-high-strength steel based on martensitic structure, and its tensile strength can reach 1500MPa. It is a high-performance structural material that has attracted much attention in recent years. application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D35/00B21D26/021C21D9/00C21D8/00
CPCB21D26/021B21D35/002C21D8/00C21D9/0068C21D2211/008
Inventor 王章忠李华冠张保森巴志新毛向阳费炜杰李振红
Owner NANJING INST OF TECH
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