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CN-121447081-B - Spray coating additive device and arc spraying additive method

CN121447081BCN 121447081 BCN121447081 BCN 121447081BCN-121447081-B

Abstract

The invention discloses a spray coating material adding device and an electric arc spray coating material adding method, belonging to the technical field of surface spray coating material adding. The upper end of the spray pipe is communicated with a high-pressure protection air source, and the lower end of the spray pipe is provided with a spray end. The baffle cover surrounds a spraying space on the outer side of the spray pipe, the spraying end is arranged in the spraying space, the upper end of the baffle cover is connected with the spray pipe, and the lower end of the baffle cover is provided with an elastically deformable air leakage edge. The wire guide mechanisms are arranged on two sides of the spray pipe in pairs and are used for conveying the metal wires to the lower side of the spray end. According to the spray coating material adding device, in the process of material adding spraying, air in the inner space is discharged, the high-purity protective gas atmosphere is maintained, oxidation and pollution are reduced, and the efficiency and quality of material adding are improved. The elastically deformable air leakage edge and the surface of the base material generate gaps so as to exhaust air, so that the loss of the shielding gas can be reduced, the uneven surface of the base material is self-adapted, and the material increasing efficiency is improved.

Inventors

  • Lai Weiji
  • XU QIHANG
  • WANG XIAOJIAN
  • YOU DEQIANG
  • CAO CHENG
  • Huang Minsi

Assignees

  • 暨南大学

Dates

Publication Date
20260505
Application Date
20260106

Claims (8)

  1. 1. A spray-on additive device, comprising: The device comprises a spray pipe, a high-pressure protection gas source and a high-pressure protection gas source, wherein one end of the spray pipe is provided with a spray end, and the other end of the spray pipe is communicated with the high-pressure protection gas source so that the protection gas is sprayed out from the spray end towards a first direction; the spraying device comprises a spray pipe, a baffle cover, a hollow air bag, a spray pipe, a gas leakage edge, a gas bag and a gas filling pipe, wherein the spray space is formed by enclosing the baffle cover on the outer side of the spray pipe, the spray end is arranged in the spray pipe, one end of the baffle cover along the first direction is provided with the gas leakage edge which can elastically deform, the other end of the baffle cover is connected with the spray pipe, the baffle cover comprises a cover body and the gas leakage edge, the gas leakage edge is arranged at one end of the cover body along the first direction, the cover body is made of hard materials, the gas leakage edge is made of elastic materials, the baffle cover is provided with the hollow air bag, the air bag and the spray pipe are communicated with the same high-pressure protection gas source, so that the air pressure of the air bag is similar to the air pressure in the spray space, the air bag can be ventilated and expanded to form the gas leakage edge, and the gas in the spray space can be pushed up the gas leakage edge formed by the air bag, so that the air pressure and the atmosphere in the spray space can be maintained. The wire guide mechanisms are arranged on two sides of the spray pipe in pairs, and are used for conveying the metal wires to one side of the spraying end in the first direction.
  2. 2. The spray coating additive device of claim 1, wherein the wire guide mechanism comprises a wire guide channel, the wire guide channel is communicated with the inner side and the outer side of the shielding cover, one end of the wire guide channel in the spraying space is arranged towards one side of the spraying end in the first direction, and the wire rod penetrates through the wire guide channel.
  3. 3. The spray coating additive device of claim 2, wherein the wire guide mechanism further comprises a wire feeding member disposed at the other end of the wire guide channel, the wire feeding member being configured to convey the wire along the wire guide channel.
  4. 4. The spray coating additive device of claim 1, wherein the shield has a conical barrel shape, one end of the shield in a first direction is wider and the other end is narrower, and the shield is coaxially arranged with the spray pipe.
  5. 5. The spray coating additive device of claim 1, wherein the shield is resiliently disposed in the first direction.
  6. 6. An arc spray coating additive method based on the spray coating additive device according to any one of claims 1 to 5, characterized by comprising the steps of: aligning the spray pipe to a substrate to be sprayed, wherein the baffle cover is arranged at the spraying position of the substrate, and the air leakage edge is contacted with the substrate; continuously introducing high-pressure protective gas from the spray pipe, filling the spraying space in the shielding cover with the protective gas, and discharging the protective gas from the position between the air leakage edge and the base material; step three, the metal wires of the two wire guiding mechanisms are respectively connected with the positive electrode and the negative electrode of the high-voltage power supply, and the end parts of the metal wires are close to the lower side of the spraying end; and step four, moving the spray coating additive adding device along a preset path to realize spray deposition additive adding.
  7. 7. The method of claim 6, wherein in the third step, the wire guide mechanism continuously conveys the wire material so that a high-temperature arc can be generated between two adjacent wire material ends, the high-temperature arc melts the wire material ends, and the high-flow-rate shielding gas passing through the spraying end breaks up and atomizes and blows the wire material to the spraying area.
  8. 8. The arc spraying additive manufacturing method according to claim 6, wherein the pressure of the shielding gas is greater than atmospheric pressure, and the shielding gas is continuously discharged from the spraying space to maintain the atmosphere in the spraying control and prevent the outside air from entering.

Description

Spray coating additive device and arc spraying additive method Technical Field The invention relates to the technical field of additive manufacturing, in particular to a spray coating additive device and an arc spraying additive method. Background The use of arc spraying in additive manufacturing, commonly referred to as arc spraying additive manufacturing or wire arc additive manufacturing, is not a traditional high precision 3D printing, but represents a great advantage in certain production situations. In conventional arc spray additive processing, an arc is formed between the proximal ends of two wires, which are continually fed to an arc zone. The high velocity gas flow created by the compressed gas atomizes the arc melted wire and pushes the resulting droplets toward the deposition substrate. One major disadvantage of conventional wire-fed arc spraying techniques is that the metal droplets oxidize in contact with the atmosphere during flight. This is mainly due to the fact that wire feed arc spraying uses compressed air as the source of motive force for the metal droplets, which results in the production of oxides due to the presence of various reactive gases in the air. For metals with higher metal activity at high temperature, such as titanium, aluminum and magnesium, when arc spraying is used for additive manufacturing deposition, the metals inevitably contact with gases such as oxygen, nitrogen and the like in the atmospheric environment, so that oxides generated by the reaction are mixed into the deposited metals, and the additive effect is affected. Disclosure of Invention The present invention is directed to a spray coating additive device that addresses one or more of the problems of the prior art, providing at least one of a beneficial choice or creation. The technical scheme adopted for solving the technical problems is as follows: a spray coating additive device comprises a spray pipe, a baffle cover and a guide wire mechanism; one end of the spray pipe is provided with a spray end, and the other end of the spray pipe is communicated with a high-pressure protection gas source so that the protection gas is sprayed out from the spray end towards a first direction; The baffle cover is arranged outside the spray pipe in a surrounding mode to form a spraying space, the spraying end is arranged in the spraying space, one end of the baffle cover along the first direction is provided with an elastically deformable air leakage edge, and the other end of the baffle cover is connected with the spray pipe; The wire guide mechanisms are arranged on two sides of the spray pipe in pairs, and are used for conveying the metal wires to one side of the spraying end in the first direction. The spray coating material adding device provided by the application has the advantages that during actual use, the first direction is set towards the area where the material adding is required to be sprayed on the base material, and the high-pressure protective gas is injected through the spray pipe, so that the spraying space surrounded by the baffle cover can be filled with the protective gas, and the purity of the gas atmosphere is maintained. The high-pressure protective gas can be discharged from the deformed gas discharge edge, so that the loss of the protective gas is small, the protective atmosphere of the spraying space can be maintained, and the gas pressure can be kept in dynamic balance. In the wire guiding mechanisms arranged in pairs, the metal wires are respectively connected with positive and negative voltages, the wire guiding mechanisms enable the end parts of the two metal wires to be close to each other, the protective gas between the two metal wires breaks down, and high-temperature electric arcs are generated to be melted into metal liquid drops. The high-pressure sprayed protective gas blows off and atomizes the liquid drops and sprays the liquid drops along the first direction. In the spraying process, the spray coating additive adding device discharges air in a spraying space and maintains a high-purity protective gas atmosphere, so that oxidation and pollution of arc liquid drops are reduced. The elastically deformable air leakage edge can discharge air in the spraying space by generating gaps with the surface of the base material, so that the loss of the shielding air can be reduced, and the surface of the base material with a certain degree of roughness can be self-adapted. As a further improvement of the technical scheme, the wire guide mechanism comprises a wire guide channel, the wire guide channel is communicated with the inner side and the outer side of the shielding cover, one end of the wire guide channel in the spraying space is arranged towards one side of the spraying end in the first direction, and the wire rod penetrates through the wire guide channel. As a further improvement of the above technical solution, the wire guiding mechanism further includes a wire feeding member, the wire