A device for 3D printing high-nitrogen steel products using nitrogen arc and nitride

Abstract

The invention provides a device and method for 3D printing of high-nitrogen steel products through a nitrogen arc and nitride. Overlaying shaping of high-nitrogen steel with a set layer height is carried out through a nitrogen arc wire feeding material increase manufacturing method under normal pressure, and meanwhile nitride alloy powder is added into a molten pool through nitrogen powder feeding. A spiral air powder groove is bored in the inner wall of a coaxial spiral air powder cover, the nitride alloy powder forms air powder cyclone at a welding gun opening, the loss caused by scattering of the nitride alloy powder when the nitride alloy powder flows out of the welding gun opening is reduced, and meanwhile the effect that the nitride alloy powder and molten drops at the end of a solder wire are fully metallurgically smelted and then enter the molten pool is guaranteed. By controlling parameter matching of 3D printing, high-nitrogen steel printing layers with different nitrogen contents can be obtained. A synchronous and coaxial powder adding and wire feeding method with the nitride alloy powder and the solder wire is adopted, so that 3D printing of the high-nitrogen steel products through a technology integrating the common steel solder wire, the nitride alloy powder and the nitrogen arc is realized under normal pressure.

Description

technical field [0001] The invention belongs to the technical field of rapid prototyping, and specifically relates to a device and method for 3D printing high-nitrogen steel products by using nitrogen arc and nitride, which are suitable for additive manufacturing, welding and part repair of high-nitrogen steel materials. Background technique [0002] The interstitial element nitrogen in high nitrogen steel coordinates with other alloying elements (Mn, Cr, Mo, V, Nb and Ti, etc.), which can improve the strength, toughness, creep resistance, wear resistance and corrosion resistance of steel. However, the solubility of nitrogen under atmospheric pressure is very low, and it is very difficult to add. Due to the small amount of addition, its beneficial effect is not obvious. The common production method of high nitrogen steel is pressure smelting, which requires special production equipment, limited output and high cost. . In addition, the processing performance of high-nitrogen...

AI Technical Summary

Problems solved by technology

[0004] Existing arc 3D printing technologies generally include: coaxial or side-axis wire-fed arc 3D printing and powder-fed arc 3D printing, without coaxial addition of silk powder, and the powder cannot be rotated when adding powder

In laser 3D printing technology, there is a method of synchronous feeding of silk powder, but coaxial feeding of silk powder is not realized, and the uniformity of the weld composition is not good

[0005] Chinese patent (200710141482.2) discloses a cladding device based on argon arc welding, which adopts a coaxial powder feeding method, and the dilution rate of the obtained cladding layer is high, generally about 5% to 10%. The layer area is large, and when used in 3D printing technology, it is impossible to achieve precise control of the size of the printed product

Chinese patent (201210250419.3) discloses a double-layer gas flow protection TIG welding method for high-nitrogen steel, which uses double-layer nitrogen protection, but its nitrogen increasing effect is poor, and it cannot feed wire and add powder

Chinese patent (94240533.1) discloses a gas rotary paint spray gun, the inner surface of the gas pipe is bored with helical spirals, so that the mist paint forms a directional effect and makes the scattering surface smaller, but the utility model patent is actually in the tubular structure The inner wall is bored with thread helix, which has a poor effect on restricting the flow direction of the gas powder flow

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