Device for refining additive manufactured titanium alloy grains

Abstract

The invention relates to a device for refining additive manufactured titanium alloy grains, belonging to the technical field of additive manufacturing. The device comprises an atmosphere protection box, an additive manufacturing system, an external force volume deformation system, a gas supply system and a control system. The atmosphere protection box is a sealed box body, one side of the box bodyis provided with a mixed gas inlet, the opposite side of the box body is provided with an air outlet, and a gas supply system is connected at the mixed gas inlet for supplying gas to the atmosphere protection box. The box body of the atmosphere protection box is provided with a working part of the additive manufacturing system and a working part of the external force volume deformation system. The device also comprises a hydrogen concentration monitoring device, a hydrogen concentration alarm device, a pressure sensor, a temperature regulating plate, a moving platform and an infrared camera.The above-mentioned equipment is arranged in the atmosphere protection box. With the device for refining additive manufactured titanium alloy grains, the advantages of grain refinement, high efficiency and convenient realization are realized.

Description

technical field [0001] The invention relates to 3D printing, in particular to a device for refining and additively manufacturing titanium alloy grains, and belongs to the technical field of additive manufacturing. Background technique [0002] Laser additive manufacturing technology was developed in the 1980s. It combines laser additive manufacturing technology with the rapid prototyping principle of rapid prototyping technology to form a new rapid manufacturing technology. First, the solid model of the part is formed in the computer through the 3D CAD software, and then the model established by CAD is layered according to a certain thickness, and then the 3D solid model is converted into a 2D outline model, and then used under the control of the machine tool or robot. Methods such as synchronous powder feeding and laser deposition fill a given shape point by point with metal materials in a certain path until a three-dimensional solid shape is formed. [0003] It can be kno...

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Problems solved by technology

[0005] In this method, due to the limitation of the power of the ultrasonic equipment, during the solidification process of the deposited metal, due to the low fluidity of the molten metal and rapid solidification, the ultrasonic wave cannot produce cavitation inside the molten metal, and cannot produce sufficient nucleation. On the other hand, due to the upward transmission of ultrasonic waves from the workbench, the ability of the deposited layer to receive ultrasonic waves is different at different heights, and the ability to control columnar crystals is limited.

[0006] 2. The electromagnetic stirring method, similar to the ultrasonic vibration method, suppresses the formation and growth of columnar crystals through the action of external force stirring the molten pool. Limited ability to improve organizational performance

[0007] 3. Heat treatment method, which is a common method for processing titanium alloys. However, during laser additive manufacturing, especially in the process of manufacturing large and thick parts, due to the extremely high energy density in the manufacturing process, extremely strong heat is generated inside the parts. The internal stress causes cracks on the surface of the part to cause the part to fail. This is a problem that needs to be solved before heat treatment. Stress relief annealing may cause the part to crack and fail directly. Therefore, when manufacturing large parts, the method of changing the structure and properties of heat treatment is not applicable.

However, due to the extremely high yield strength of titanium alloys, the external force deformation often relies on heavy pressure and high impact to deform the forming layer, so the external force deformation system is usually very large. The method of applying external force to the forming surface to cause deformation, the forging equipment is huge, and the sealing of the entire processing environment is high, and the use of large forging machines reduces production efficiency and increases production costs

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