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CN-122007452-A - Airflow distribution system of additive manufacturing equipment

CN122007452ACN 122007452 ACN122007452 ACN 122007452ACN-122007452-A

Abstract

The invention discloses an airflow distribution system of additive manufacturing equipment, which is suitable for laser selective melting forming equipment and comprises a first air inlet part, a second air inlet part and an air outlet part. The first air inlet part and the second air inlet part are arranged on the same side of the molding cabin, and the first air inlet part is arranged on the upper side of the second air inlet part. The first air inlet part is configured to output a first upper air flow and a first lower air flow into the molding cabin, and the wind speed of the first upper air flow is larger than that of the first lower air flow. The second air inlet part is configured to output a second upper air flow and a second lower air flow into the molding cabin, and the wind speed of the second upper air flow is smaller than that of the second lower air flow. The wind speed of the second lower air stream is greater than the wind speed of the first lower air stream. The air outlet part is used for receiving the air in the molding cabin and flowing out the air carrying substances. The wind speeds of the first upper air flow, the first lower air flow, the second upper air flow and the second lower air flow all refer to the average wind speed when the air flows just enter the forming cabin.

Inventors

  • Zhang Junang
  • PAN HAOXING
  • LI JUNFENG

Assignees

  • 上海云铸三维科技有限公司

Dates

Publication Date
20260512
Application Date
20260306

Claims (10)

  1. 1. The air flow distribution system of the additive manufacturing equipment is characterized by being suitable for laser selective melting forming equipment, and comprises a first air inlet part, a second air inlet part and an air outlet part, wherein the first air inlet part and the second air inlet part are arranged on the same side of a forming cabin, and the first air inlet part is arranged on the upper side of the second air inlet part; The first air inlet part is configured to output a first upper air flow and a first lower air flow into the molding cabin, and the wind speed of the first upper air flow is larger than that of the first lower air flow; the second air inlet part is configured to output a second upper air flow and a second lower air flow into the molding cabin, wherein the wind speed of the second upper air flow is smaller than that of the second lower air flow; The air outlet part is used for receiving the outflow of the air in the molding cabin and the air-carried substances; The wind speeds of the first upper air flow, the first lower air flow, the second upper air flow and the second lower air flow all refer to average wind speeds when the air flows just enter the forming cabin.
  2. 2. An air flow distribution system for an additive manufacturing apparatus according to claim 1, wherein the first upper air flow passes at least through an area of 10-30 mm directly below an optical lens in the forming chamber and/or the second lower air flow passes at least through an area of 0-10 mm directly above a printing platform in the forming chamber.
  3. 3. The additive manufacturing apparatus of claim 1, wherein the first upper air stream has a wind speed of 0.5 to 1 meter/second and/or the first lower air stream has a wind speed of 0.2 to 0.4 meter/second.
  4. 4. The additive manufacturing apparatus of claim 1, wherein the second upper air stream has a wind speed of 0.2 to 0.4 m/s and/or the second lower air stream has a wind speed of 1.2 to 1.6 m/s.
  5. 5. An air flow distribution system for an additive manufacturing apparatus according to claim 1, wherein the first lower air flow has a spacing between the air outlets on the inner wall of the forming chamber and the second upper air flow.
  6. 6. The air flow distribution system of the additive manufacturing equipment according to claim 1, wherein the first air inlet part comprises an air source interface and two air inlets, the input end of the air source interface is connected and communicated with the output end of a fan of the additive manufacturing equipment, the input ends of the two air inlets are respectively connected and communicated with the output end of the air source interface, the output ends of the two air inlets are respectively connected to the inner wall of the forming cabin to respectively form air outlets on the inner wall of the forming cabin, and air conveyed by the fan enters the forming cabin from the corresponding air outlets through the two air inlets to form the first upper air flow and the first lower air flow.
  7. 7. The air flow distribution system of the additive manufacturing equipment according to claim 1, wherein the second air inlet part comprises an air source interface and two air inlets, the input end of the air source interface is connected and communicated with the output end of a fan of the additive manufacturing equipment, the input ends of the two air inlets are respectively connected and communicated with the output end of the air source interface, the output ends of the two air inlets are respectively connected to the inner wall of the forming cabin to respectively form air outlets on the inner wall of the forming cabin, and the air conveyed by the fan enters the forming cabin from the air outlets corresponding to the air inlets to respectively form the second upper air flow and the second lower air flow.
  8. 8. An air flow distribution system of an additive manufacturing apparatus according to claim 6 or 7, wherein the inlet port is provided with a throttling element at the input end.
  9. 9. An air flow distribution system for an additive manufacturing apparatus according to claim 8, wherein the throttling element provided on the input end of both air inlet channels is in one piece and/or wherein the throttling element is detachably provided.
  10. 10. An airflow distribution system of an additive manufacturing apparatus according to claim 6 or 7, wherein at least one of the air inlets comprises a serpentine mixing tube section and a rectifying section connected in series in the airflow direction, the serpentine mixing tube section being composed of a length of tubing bent a plurality of times, and the number of times of bending being not less than three.

Description

Airflow distribution system of additive manufacturing equipment Technical Field The invention belongs to the field of additive manufacturing, and particularly relates to an airflow distribution system of additive manufacturing equipment. Background In the additive manufacturing process of selective laser melting and the like, high-energy laser causes metal powder to be instantaneously melted and evaporated, and a large amount of metal smoke dust and splashes are generated. In order to protect the optical lenses and remove contaminants, a flow of shielding gas is maintained within the equipment molding chamber. Conventional airflow organization schemes generally adopt a single air inlet or a simple partition air inlet mode, and complex vortex and rollback phenomena are easily formed in the cabin, as shown in fig. 1. The air flow back-winding can cause the smoke dust and high-temperature splashes which are carried away from the printing area to redeposit or flow back to the upper part of the processing area, so that multiple hazards are caused, namely, firstly, a laser window is polluted, the stability of energy transmission of a light beam is affected, secondly, the splashes fall into an unmelted powder bed or a formed layer to form inclusion defects, the compactness and mechanical property of parts are reduced, and thirdly, the gas environment near a molten pool is disturbed, and the stability of the forming process is affected. In the prior art, although there are methods for improving the air flow by increasing the air speed or improving the air port layout, it is often difficult to balance among a plurality of objects such as efficient smoke evacuation, lens protection, powder blowing prevention, and back-rolling inhibition. Simply increasing wind speed may blow off the powder bed, while complex active wind field control increases system cost and complexity. Therefore, how to construct a stable, uniform and non-recoiling quasi-laminar wind field in the forming cabin on the premise of simple structure and controllable energy consumption is a technical problem to be solved in the field. Disclosure of Invention The invention provides an airflow distribution system of additive manufacturing equipment, which fundamentally inhibits airflow rollback and vortex by differential wind speed distribution and ensures directional and efficient discharge of smoke dust. The technical scheme of the invention is as follows: The air flow distribution system of the additive manufacturing equipment is suitable for laser selective melting forming equipment and comprises a first air inlet part, a second air inlet part and an air outlet part, wherein the first air inlet part and the second air inlet part are arranged on the same side of a forming cabin, and the first air inlet part is arranged on the upper side of the second air inlet part; The first air inlet part is configured to output a first upper air flow and a first lower air flow into the molding cabin, and the wind speed of the first upper air flow is larger than that of the first lower air flow; the second air inlet part is configured to output a second upper air flow and a second lower air flow into the molding cabin, wherein the wind speed of the second upper air flow is smaller than that of the second lower air flow; The air outlet part is used for receiving the outflow of the air in the molding cabin and the air-carried substances; The wind speeds of the first upper air flow, the first lower air flow, the second upper air flow and the second lower air flow all refer to average wind speeds when the air flows just enter the forming cabin. In the air flow distribution system of the additive manufacturing device provided in a preferred embodiment, the first upper air flow at least passes through an area of 10-30 mm right below the optical lens in the molding cabin, and/or the second lower air flow at least passes through an area of 0-10 mm right above the printing platform in the molding cabin. In the airflow distribution system of the additive manufacturing apparatus provided in a preferred embodiment, a wind speed of the first upper airflow is 0.5 to 1 m/s, and/or a wind speed of the first lower airflow is 0.2 to 0.4 m/s. In the air flow distribution system of the additive manufacturing device provided in a preferred embodiment, the air speed of the second upper air flow is 0.2-0.4 m/s, and/or the air speed of the second lower air flow is 1.2-1.6 m/s. In the air flow distribution system of the additive manufacturing apparatus provided in a preferred embodiment, a space is provided between the air outlet of the first lower air flow on the inner wall of the forming cabin and the air outlet of the second upper air flow on the inner wall of the forming cabin. In the air flow distribution system of the additive manufacturing equipment provided by a certain preferred embodiment, the first air inlet part comprises an air source interface and two air inlets, the input end o