Positive pressure type anti-oxidation device suitable for cold spraying additive manufacturing and application of positive pressure type anti-oxidation device

Abstract

The invention discloses a positive pressure type anti-oxidation device suitable for cold spraying additive manufacturing and application of the positive pressure type anti-oxidation device, and relates to the technical field of additive manufacturing. Comprising a spraying cabin and a cover plate which are arranged in a split mode, the spraying cabin is used for containing a spraying base body, a spray gun hole is formed in the cover plate, and the outer surface of a spray gun is sleeved with the cover plate through the spray gun hole; when additive manufacturing operation is carried out, the spray gun and the spraying base body are correspondingly arranged in a spaced mode, and an opening is formed between the spraying cabin body and the cover plate. The spraying cabin is arranged outside the spraying base body, the outer surface of the spraying gun is sleeved with the cover plate, and the gap is formed between the spraying cabin and the cover plate in the additive manufacturing process, so that when additive manufacturing operation starts, inert gas sprayed out of the spraying gun forms inert gas positive pressure in the spraying cabin, and the inert gas positive pressure is formed in the spraying cabin; and air in the spraying cabin and redundant spraying powder particles in the spraying cabin are emptied through high-speed flowing of cold spraying rebound gas, so that the anti-oxidation effect in the cold spraying additive manufacturing process is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a positive pressure anti-oxidation device suitable for cold spray additive manufacturing and an application thereof. Background Art

[0002] Additive manufacturing is a disruptive technology that directly manufactures three-dimensional entities based on layer-by-layer stacking of materials. It is an important part of advanced manufacturing. In recent years, cold spray additive manufacturing technology has attracted much attention due to its high preparation rate, unlimited size and thickness of additive bodies, and excellent physical and chemical properties of additive bodies. It has been applied in many industrial fields such as large-size printing plate rollers and precious metal rotating target manufacturing.

[0003] However, in the cold spray additive manufacturing process, since the temperature of the spraying surface is relatively high, generally 200-300°C, and the interlayer residence time is too long during layer-by-layer spraying, the surface of the newly formed additive body is prone to obvious oxidation, thereby producing a layered oxide layer, and the layered oxide layer is periodically distributed inside the additive body, which seriously affects the uniformity of the additive body's organization and reduces the physical and chemical properties of the additive body.

[0004] At present, the main method to prevent the oxidation of the material surface during the cold spray additive manufacturing process is to place the cold spray equipment as a whole in a vacuum tank for operation. However, this method has high hardware investment costs and requires vacuum treatment before spraying. The process is cumbersome and time-consuming, and is only suitable for the personalized customization of high-value-added industrial products. Therefore, it is still necessary to develop an anti-oxidation method that is suitable for ordinary cold spray additive manufacturing operations, simple and convenient to operate, and low in cost, so as to effectively slow down the oxidation phenomenon between the additive layers during the process.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The object of the present invention is to provide a positive pressure anti-oxidation device suitable for cold spray additive manufacturing and its application.

[0007] The present invention is achieved in that:

[0008] In the first aspect, the present invention provides a positive pressure anti-oxidation device suitable for cold spray additive manufacturing, comprising a spray chamber and a cover plate which are separately arranged, the spray chamber being used to accommodate a spray substrate, the cover plate being provided with a spray gun hole, and the cover plate being sleeved on the outer surface of the spray gun through the spray gun hole; when performing additive manufacturing operations, the spray gun and the spray substrate are arranged at corresponding intervals, and an opening is provided between the spray chamber and the cover plate.

[0009] In an optional embodiment, when performing additive manufacturing, the distance between the spray chamber and the opening of the cover plate is 1 to 20 mm. When the distance of the opening is too small, even <1 mm, the risk of collision between the cover plate and the spray chamber is high, and the spraying operation cannot be carried out.

[0010] In an optional implementation, the cover plate and the spray gun are connected and fixed by a limiting sleeve or a clamp.

[0011] In an optional embodiment, the spray chamber is an unsealed polyhedron.

[0012] In an optional embodiment, the spray chamber is an unsealed quadrangular prism, wherein the length of the quadrangular prism is 10 to 200 cm, the width is 10 to 200 cm, and the height is 10 to 80 cm.

[0013] In an optional embodiment, the cover plate has a length of 30 to 300 cm and a width of 30 to 300 cm.

[0014] In an optional implementation, the thickness of the spray chamber body is 0.1 to 5 mm, and the thickness of the cover plate is 0.1 to 5 mm.

[0015] In an optional embodiment, the materials of the spray cabin and the cover plate are both metal;

[0016] Preferably, the invention metal is a stainless steel metal, and the invention stainless steel metal includes any one of 304, 304L, 316 and 316L.

[0017] In an optional embodiment, the preparation process of the spray cabin body includes at least one of riveting, computer numerical control machine tool processing, sheet metal processing and welding.

[0018] In a second aspect, the present invention provides an application of a device as provided in any of the aforementioned embodiments to prevent product oxidation during additive manufacturing.

[0019] The present invention has the following beneficial effects:

[0020] The present invention provides a positive pressure anti-oxidation device suitable for cold spraying additive manufacturing and its application. A spraying cabin is arranged outside a spraying substrate, a cover plate is sleeved on the outer surface of a spray gun, and during the additive manufacturing process, a gap is provided between the spraying cabin and the cover plate. When the additive manufacturing operation starts, the inert gas sprayed from the spray gun forms an inert gas positive pressure in the spraying cabin. The air in the spraying cabin and the excess spraying powder particles in the spraying cabin are evacuated through the high-speed flow of the cold spraying rebound gas, thereby achieving the anti-oxidation effect in the cold spraying additive manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic structural diagram of a positive pressure anti-oxidation device provided in a first embodiment of the present invention;

[0023] Figure 2 A cross-sectional view of a positive pressure anti-oxidation device provided in a first embodiment of the present invention;

[0024] Figure 3 A schematic diagram of the working process of the positive pressure anti-oxidation device provided in the first embodiment of the present invention;

[0025] Figure 4 A metallographic image of an additively manufactured product after spraying of the positive pressure anti-oxidation device provided by the first embodiment of the present invention;

[0026] Figure 5 This is a metallographic image of an additively manufactured product after spraying by the cold spray additive manufacturing device provided in the first comparative example of the present invention.

[0027] Explanation of the main component symbols: 100 - positive pressure anti-oxidation device; 110 - spraying chamber; 120 - cover plate; 130 - opening; 210 - spraying substrate; 220 - spray gun. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be a clear and complete description of the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0032] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] First embodiment

[0035] Please refer to Figure 1 and 2 The present embodiment provides a positive pressure anti-oxidation device 100 suitable for cold spray additive manufacturing, including a spray chamber 110 and a cover plate 120 which are separately arranged. The spray chamber 110 is used to accommodate a spray substrate 210. The cover plate 120 is provided with a spray gun 220 hole. The cover plate 120 is sleeved on the outer surface of the spray gun 220 through the spray gun 220 hole. When the additive manufacturing operation is performed, the spray gun 220 and the spray substrate 210 are arranged at a corresponding interval, and an opening 130 is provided between the spray chamber 110 and the cover plate 120.

[0036] like Figure 3As shown, in the process of cold spray additive manufacturing, the working atmosphere is a high-pressure inert gas atmosphere (helium or nitrogen), and the interlayer oxidation phenomenon is generated during the cooling process after spraying. Therefore, a spray chamber 110 can be set outside the spray substrate 210, and a cover plate 120 can be set on the outer surface of the spray gun 220. In the process of additive manufacturing, there is a gap between the spray chamber 110 and the cover plate 120. When the additive manufacturing operation starts, the inert gas sprayed from the spray gun 220 forms an inert gas positive pressure in the spray chamber 110, and the air inside the spray chamber 110 and the excess spray powder particles in the spray chamber 110 are emptied through the high-speed flow of the cold spray rebound gas. When a positive pressure environment is formed between the spray chamber 110 and the cover plate 120, even if the spraying process is suspended during interlayer spraying, the interlayer oxidation phenomenon can be greatly alleviated, thereby achieving the anti-oxidation effect of the cold spray additive manufacturing process.

[0037] In this embodiment, when the additive manufacturing operation is performed, the distance between the spray chamber 110 and the opening 130 of the cover plate 120 is 10 mm. In other embodiments, the distance may be any value of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm or 20 mm, or a range between any two values.

[0038] In this embodiment, the cover plate 120 and the spray gun 220 are connected and fixed by a limiting sleeve. In other embodiments, the cover plate 120 and the spray gun 220 can also be fixed by other connecting structures, as long as the cover plate 120 and the spray gun 220 can be fixed.

[0039] In this embodiment, in order to ensure a positive pressure environment in the spray chamber 110, the length and width of the cover plate 120 are both greater than the length and width of the spray chamber 110, and the spray gun 220 will move left, right, up or down along the spraying path during the cold spraying process to form a pattern for each layer. Therefore, the length and width of the cover plate 120 are designed to exceed the length and width of the spray chamber 110, so that the area where the spray chamber 110 is located can be covered even if the spray gun 220 moves during the cold spraying process.

[0040] In this embodiment, the spray chamber 110 is an unsealed quadrangular prism with a length of 80 cm, a width of 50 cm, and a height of 40 cm.

[0041] In this embodiment, the cover plate 120 has a length of 150 cm and a width of 100 cm.

[0042] In this embodiment, in order to ensure the strength of the spray chamber 110 and the cover plate 120 and prevent the force generated during the cold spraying process from damaging the spray chamber 110 and the cover plate 120, the thickness of the spray chamber 110 is 1 mm, and the thickness of the cover plate 120 is 1 mm.

[0043] In this embodiment, the material of the spray chamber 110 is 316L, and the material of the cover plate 120 is 316L.

[0044] In this embodiment, the spray chamber 110 is prepared by welding. In other embodiments, the spray chamber 110 can also be formed in one piece or made by a stamping process.

[0045] The first comparison

[0046] This comparative example provides a cold spraying additive manufacturing device, the structure of which is similar to that of the first embodiment, except that it does not include a spraying chamber 110 and a cover plate 120 .

[0047] The second comparison

[0048] This comparative example provides a cold spray additive manufacturing device, the structure of which is similar to that of the first embodiment, except that the size of the opening 130 is 40 mm.

[0049] Test example

[0050] The positive pressure anti-oxidation device 100 manufactured by cold spray additive manufacturing of the first embodiment and the first comparative example device are respectively subjected to cold spray additive manufacturing processes to prepare the same product. The preparation processes are as follows:

[0051] The cold spray additive equipment is the CX-510A cold spray equipment provided by Guangdong Academy of Sciences New Materials. The powder used for cold spray is spherical Cu powder with a particle size of 13 to 53 μm. The spray gas pressure is 5 MPa, the spray gas temperature is 700 °C, and the spray powder feeding rate is 100 g / min. The size of the prepared cold spray additive manufacturing product is 5 cm*10 cm*1.5 cm, as shown in Table 1. Figure 4 and 5 Results shown.

[0052] Table 1 Performance of additively manufactured products

[0053] Conductivity / IACS% Tensile strength / MPa First embodiment 90.67±1.07 349.5 The first comparison 83.50±2.43 281.3 The second comparison 85.61±1.78 299.6

[0054] As can be seen from Table 1, by installing a positive pressure anti-oxidation device 100 outside the cold spray additive manufacturing device, the electrical conductivity and tensile strength of the obtained cold spray product are significantly improved. Figure 4 and Figure 5It can be seen that the cold sprayed product obtained by the positive pressure anti-oxidation device 100 in the embodiment of the present invention has almost no interlayer oxidation phenomenon, while the first comparative example directly performs the cold spraying process, and the cold sprayed product obtained has obvious interlayer oxidation phenomenon.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positive pressure anti-oxidation device suitable for cold spray additive manufacturing, characterized in that: It comprises a spray chamber body and a cover plate which are separately arranged, wherein the spray chamber body is used to accommodate a spray substrate, the cover plate is provided with a spray gun hole, and the cover plate is sleeved on the outer surface of the spray gun through the spray gun hole; when performing additive manufacturing operations, the spray gun and the spray substrate are arranged at corresponding intervals, and an opening is provided between the spray chamber body and the cover plate.

2. The device according to claim 1, characterized in that When performing additive manufacturing operations, the distance between the spray chamber and the opening of the cover plate is 1 to 20 mm.

3. The device according to claim 1, characterized in that The cover plate and the spray gun are connected and fixed by using a limiting sleeve or a clamp.

4. The device according to claim 1, characterized in that The spraying cabin body is an unsealed polyhedron.

5. The device according to claim 4, characterized in that The spray cabin body is an unsealed quadrangular prism, and the length of the quadrangular prism is 10 to 200 cm, the width is 10 to 200 cm, and the height is 10 to 80 cm.

6. The device according to claim 4, characterized in that The length of the cover plate is 30 to 300 cm, and the width is 30 to 300 cm.

7. The device according to claim 1, characterized in that The thickness of the spray chamber body is 0.1-5 mm, and the thickness of the cover plate is 0.1-5 mm.

8. The device according to claim 1, characterized in that The spray cabin and the cover plate are both made of metal; Preferably, the metal is stainless steel, and the stainless steel includes any one of 304, 304L, 316 and 316L.

9. The device according to claim 1, characterized in that The preparation process of the spray cabin body includes at least one of riveting, computer numerical control machine tool processing, sheet metal processing and welding.

10. Use of the device according to any one of claims 1 to 9 for preventing oxidation of products during additive manufacturing.

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