A device and method for laser selective melting mixed powder
A technology of laser selective melting and powder mixing, which is used in the improvement of process efficiency, additive manufacturing, additive processing, etc., to achieve the effect of sufficient and rapid mixing and quality improvement
Active Publication Date: 2022-06-21
JIANGSU UNIV
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Problems solved by technology
[0003] However, the idea of mixing various alloy powders in a gas-filled powder chamber has not yet been proposed. For example, current research has found that adding an appropriate amount of hydrogen to titanium alloys can improve its thermal processing performance, and even obtain superplastic deformation characteristics. After some specific heat treatments, ultra-fine grains will appear inside the titanium alloy, which will lead to a greater improvement in its overall performance. Therefore, putting hydrogen into titanium alloy powder at high temperature has also become an important step in the future titanium alloy processing technology. one
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example 1
[0024] Mixing metal powders under high temperature hydrogen
[0025] Open the exhaust valve 9 to exhaust the air in the powder storage chamber 11 , and close the exhaust valve 9 . Open the scraper 7, put the Ti6Al4V alloy powder and pure copper powder into the powder storage cavity 11, and close the scraper 7. Then open the gas delivery valve 8, input the hydrogen in the gas storage cylinder 15 into the powder storage chamber 11, and sense the pressure in the powder storage chamber 11 through the pressure sensor 10. When the pressure is stable at 15kPa, close the gas delivery valve 8 and The heating and stirring functions of the electromagnet 12 are adjusted by the control center 1 . The powder storage chamber 11 is heated to 750°C, and a variety of solid powders are mixed in a hydrogen-filled environment for 40 minutes. After the mixing is completed, the stirring function of the electromagnetic disk 12 is turned off by the control center 1 and the exhaust valve 9 is opened....
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The invention relates to the technical field of laser selective melting, in particular to a device and method for laser selective melting of mixed powder. The method of the invention is to put titanium alloy powder and pure copper powder into the powder storage chamber, input the gas in the gas storage bottle into the powder storage chamber through the gas delivery valve, and adjust the heating function of the electromagnetic disk through the control center to adjust the working chamber. The ambient temperature, and then adjust the electric disk rotation stirring function to make the electric disk rotate at a high speed, so that various alloy powders and hydrogen are fully mixed. Then adjust its heating function to solution age the mixed powder, and then cool to room temperature. The mixed powder has superplastic deformation characteristics, the grains are refined and the columnar crystals are eliminated, and then the powder is moved to the worktable of the part molding room for printing and molding under the action of the telescopic rod and the scraper.
Description
technical field [0001] The invention relates to the technical field of laser selective melting, in particular to a device and method for laser selective melting of mixed powder. Background technique [0002] Laser additive manufacturing technology is a new technology for free rapid prototyping of three-dimensional entities that builds parts layer by layer and forms them by rapid heating of lasers. , ships and other fields, the powder required for forming plays a key role in the performance of the final formed part. For example, adding a certain amount of Nb, Mo, and W particles to the titanium alloy powder is conducive to refining the crystal of the titanium alloy. particles, thereby increasing the strength of the titanium alloy. Furthermore, existing research has shown that adding a certain amount of Cu element to Ti6Al4V powder can facilitate overcoming the thermal effect of Ti6Al4V powder caused by the high temperature in the laser additive manufacturing process, and eli...
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IPC IPC(8): B22F3/105B33Y10/00B33Y30/00B33Y40/10
CPCB33Y10/00B33Y30/00B33Y40/00B22F10/00B22F10/34B22F12/90B22F10/28B22F12/67B22F12/70Y02P10/25
Inventor 程维鲁金忠徐刚罗开玉戴峰泽
Owner JIANGSU UNIV