Liquid nitrogen follow-up cooling additive manufacturing device and method

A technology of additive manufacturing and cooling device, which is applied in the field of additive manufacturing, can solve the problems of unsuitable additive manufacturing structural parts and limited use of space, and achieve the effects of saving waiting cooling time, improving precision, and improving additive quality

Inactive Publication Date: 2020-06-16
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the device is limited by the use of space and is not suitable for additively manufactured structural parts with more complex structures.

Method used

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  • Liquid nitrogen follow-up cooling additive manufacturing device and method
  • Liquid nitrogen follow-up cooling additive manufacturing device and method
  • Liquid nitrogen follow-up cooling additive manufacturing device and method

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] Such as Figure 1-3 As shown, a liquid nitrogen follow-up cooling additive manufacturing device includes:

[0043] 2-Welding torch tip clamp, which is a circular clamp, used to clamp the welding torch tip; 3-Connection mechanism, a cylinder with a circular clamp at one end, used to connect the welding torch tip clamp and nozzle clamp; 4- The nozzle clamp is a cylinder with circular clamps at both ends, which is used to clamp the connection mechanism and the nozzle; 5-nozzle, which is used to connect the liquid nitrogen conduit.

[0044] It proceeds as follows:

[0045] Using CMT additive manufacturing system, the welding wire used is 316L stainless steel wire with a diameter of 1.0mm; the substrate is 6mm thick 304 stainless steel substrate; the shielding gas is argon oxygen: 98.5% Ar+1.5% O2;

[0046] Step 1: According to the size and shape of the ...

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Abstract

The invention belongs to the field of additive manufacturing, and particularly relates to a liquid nitrogen follow-up cooling additive manufacturing device and method. The device comprises an additiverobot, a welding gun head, a connecting mechanism and a nozzle; the additive robot is used for additive manufacturing, the welding gun head is arranged at the head of the additive robot, the nozzle is connected with a liquid nitrogen guide pipe, the nozzle is connected with the welding gun head through the connecting mechanism, and thus when the welding gun moves, the nozzle moves along with thewelding gun for cooling. According to the liquid nitrogen follow-up cooling additive manufacturing device and the method, heat accumulated in the additive manufacturing process can be effectively dissipated, residual stress and deformation caused by excessive heat input are reduced, and the forming quality and the mechanical performance are improved. Aiming at oxidation possibly occurring in the metal additive manufacturing process and in the process that liquid nitrogen is adopted as a cooling medium for cooling, the oxidation problem in the additive manufacturing process can be avoided whilecooling is conducted.

Description

technical field [0001] The invention belongs to the field of additive manufacturing, and in particular relates to a liquid nitrogen follow-up cooling additive manufacturing device and method. Background technique [0002] Additive manufacturing technology is a technology based on CAD / CAM design, which uses a layer-by-layer accumulation method to manufacture solid parts. Compared with traditional subtractive manufacturing (cutting) technology, it is a manufacturing method of material accumulation. Heat sources commonly used in manufacturing processes are high-energy beams and electric arcs. [0003] In the process of metal additive manufacturing, especially when adding materials with relatively low thermal conductivity, such as stainless steel, high-strength steel, high-nitrogen steel, etc., there is a problem that heat is not easily lost. With the continuous accumulation of heat, the additive manufacturing sample undergoes multiple thermal cycles such as rapid melting and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/133B23K9/28B23K9/32B33Y10/00B33Y30/00G01J5/00G01J5/02
CPCB23K9/133B23K9/16B23K9/285B23K9/287B23K9/32B33Y10/00B33Y30/00G01J5/00G01J5/0205
Inventor 彭勇李凡王克鸿周琦杨东青范霁康陈海瑞
Owner NANJING UNIV OF SCI & TECH
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