Turbulent flow assembly for forming laminar flow air field in printing cabin, control method and additive manufacturing equipment

Abstract

The invention provides a turbulent flow assembly (12) for forming a laminar flow air field in a printing cabin (10), a control method and additive manufacturing equipment, and the turbulent flow assembly (12) comprises one or more interference parts (121) which are arranged between an inlet (100) of the printing cabin (10) and a forming platform (11) at a preset angle and a preset size, and the outlet (101) is used for converting the turbulent flow introduced from the inlet (100) above the forming platform (11) into a laminar flow field with a specific size and flow velocity and controlling the laminar flow field to flow to the printing cabin (10) along a preset height above the forming platform (11). According to the turbulent flow assembly (12), high-speed turbulent flow guided in by the printing cabin (10) can be converted into low-speed laminar flow, so that the influence of the high-speed turbulent flow on the forming quality of a three-dimensional object is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of additive manufacturing equipment, and more specifically to a spoiler component and a control method and an additive manufacturing equipment for forming a laminar wind field in a printing cabin. Background Art

[0002] In additive manufacturing processes (such as metal powder bed fusion or directed energy deposition), in order to maintain the temperature uniformity of the printing chamber to avoid local overheating, reduce residual stress and thermal deformation, additive manufacturing equipment is often equipped with an airflow control system, such as air compressor airflow introduction. At present, most of the existing airflow control systems use forced airflow to introduce airflow from the inlet of the printing chamber at high speed and quickly flow along the direction of the printing chamber to the outlet. Although this design can quickly control the heat and smoke in the processing area, it is easy to form lateral high-speed turbulence inside the printing chamber. Turbulence is a complex nonlinear phenomenon in fluid motion, with randomness, high energy dissipation and multi-scale characteristics.

[0003] At present, although high-speed turbulence helps to enhance gas exchange and improve heat dispersion efficiency, the strong airflow disturbance caused by high-speed turbulence may lift the laid powder layer, resulting in uneven or missing powder distribution or impurities on the surface of the three-dimensional object, which not only affects the uniformity of each layer during the printing process, but also leads to a decrease in the geometric accuracy of the parts and even the formation of local defects; and, under the action of the turbulent velocity gradient, the powder material may agglomerate or over-diffusion. The agglomerated powder material will affect the density and mechanical properties of the powder material, while excessive diffusion may lead to waste of powder material or reduced deposition efficiency. Summary of the invention

[0004] The present application provides a spoiler component and control method and additive manufacturing equipment for forming a laminar wind field in a printing chamber, which can transform the high-speed turbulence introduced into the printing chamber into a low-speed laminar flow, so as to reduce the influence of the high-speed turbulence on the forming quality of three-dimensional objects.

[0005] In a first aspect, the present application provides a spoiler assembly for forming a laminar wind field in a printing chamber, one or more interference parts, which are arranged between the inlet of the printing chamber and the forming platform at a preset angle and preset size, and are used to transform the turbulent flow introduced into the inlet above the forming platform into a laminar flow field of specific size and flow rate and control the laminar flow field to flow along a preset height above the forming platform to the outlet of the printing chamber.

[0006] In an optional solution of the first aspect, the one or more interference parts are installed between the inlet and the forming platform in a preset structure.

[0007] In an optional solution of the first aspect, the one or more interference parts are installed between the inlet and the forming platform in a V-shaped structure.

[0008] In an optional solution of the first aspect, a cross section of one or more interference portions of the V-shaped structure is at a preset angle.

[0009] In an optional solution of the first aspect, the one or more interference parts are partially or completely arc-shaped surface structures installed between the inlet and the forming platform.

[0010] In an optional solution of the first aspect, the one or more interference parts are installed between the inlet and the forming platform in a W-shaped structure.

[0011] In an optional solution of the first aspect, the open space of the one or more interference parts is close to the inlet, and the closed space of the one or more interference parts is close to the forming platform.

[0012] In an optional solution of the first aspect, the one or more interference parts are installed at a preset height between the inlet and the forming platform.

[0013] In an optional solution of the first aspect, it further includes: an angle adjustment component, which is connected to the one or more interference parts and is used to adjust the one or more interference parts to a preset angle.

[0014] In an optional scheme of the first aspect, the angle adjustment assembly is installed between the inlet and the forming platform and adjusts the one or more interference parts to a preset angle to form a preset structure, and the open space of the preset structure is close to the inlet, and the closed space of the preset structure is close to the forming platform.

[0015] In an optional scheme of the first aspect, it also includes: one or more protrusions, which are arranged at a preset angle in the open space of the one or more interference parts, and the one or more protrusions are used to reduce the Reynolds coefficient of turbulence and improve the efficiency of turbulence transformation to form a laminar flow field.

[0016] In an optional solution of the first aspect, a plurality of protrusions are arranged in an array along a preset direction of the open space of the one or more interfering parts and are combined to form a rough layer that improves friction resistance.

[0017] In a second aspect, the present application provides a turbulence control method for forming a laminar wind field in a printing chamber, the method comprising: transforming the turbulent flow introduced into the inlet of the printing chamber into a laminar flow field of specific size and flow rate above a forming platform; controlling the laminar flow field to flow along a preset height above the forming platform to the outlet of the printing chamber.

[0018] In an optional scheme of the second aspect, when forming a laminar flow field of a specific size and flow rate, the method further includes: controlling the laminar flow field to flow to an outlet of the printing chamber along a preset angle and a preset height above the forming platform.

[0019] In a second aspect, the present application provides an additive manufacturing device having the above-mentioned spoiler component, and also includes: a printing chamber, which is provided with an inlet and an outlet, the inlet being set to a preset style for introducing high-speed turbulent flow into the printing chamber; the outlet is used to export the disturbed low-speed laminar flow out of the printing chamber.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above summary of the invention and the following description may be better understood in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A schematic diagram showing an exemplary effect of different airflows on a three-dimensional object according to some embodiments of the present application.

[0023] Figure 2 is a schematic structural diagram of an exemplary printing chamber according to some embodiments of the present application.

[0024] Figure 3 is a first simulation schematic diagram of an exemplary fluid according to some embodiments of the present application.

[0025] Figure 4 is a second simulation schematic diagram of an exemplary fluid according to some embodiments of the present application.

[0026] Figure 5 is a third simulation schematic diagram of an exemplary fluid according to some embodiments of the present application.

[0027] Figure 6 It is a schematic diagram of an exemplary arrangement structure of an interference part according to some embodiments of the present application.

[0028] Figure 7 It is a schematic diagram of the structure of an exemplary interference unit array according to some embodiments of the present application.

[0029] Figure 8 is a schematic structural diagram of an exemplary V-shaped structure interference portion according to some embodiments of the present application; wherein, Figure 8 a is a schematic diagram of the structure of a single V-shaped interference part. Figure 8 b(1) is a schematic diagram of a first connection structure of multiple single-layer V-shaped structure interference parts, Figure 8 b(2) is a schematic diagram of a second connection structure of multiple single-layer V-shaped structure interference parts, Figure 8 c is a schematic diagram of the structure of multiple multi-layer V-shaped structure interference parts.

[0030] Fig. 9 is a schematic structural diagram of an exemplary W-shaped structure interference portion according to some embodiments of the present application; wherein, Fig. 9 a is a schematic diagram of the structure of a single W-shaped interference unit. Fig. 9 b is a schematic diagram of the connection structure of multiple single-layer W-shaped structure interference parts, Fig. 9 c is a schematic diagram of the structure of multiple multi-layer W-shaped structure interference parts.

[0031] Fig.10 is a schematic structural diagram of an exemplary arc-shaped structure interference portion according to some embodiments of the present application; wherein, Fig.10 a(1) is a schematic diagram of the structure of a single all-arc structure interference part. Fig.10 a(2) is a schematic diagram of the structure of a single partial arc-shaped structure interference part. Fig.10 b is a schematic diagram of the connection structure of multiple single-layer arc-shaped structure interference parts, Fig.10 c is a schematic diagram of the structure of multiple multi-layer arc-shaped structure interference parts.

[0032] Fig.11 It is a schematic diagram of the structure of an exemplary array of multiple interference parts of different heights according to some embodiments of the present application.

[0033] Fig.12 It is a schematic diagram of the connection structure between an exemplary angle adjustment component and an interference part according to some embodiments of the present application.

[0034] Fig.13 It is a schematic structural diagram of an exemplary interference portion provided with a protruding portion according to some embodiments of the present application.

[0035] Fig.14 It is a schematic structural diagram of an exemplary interference portion provided with a raised layer according to some embodiments of the present application. DETAILED DESCRIPTION

[0036] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "located on" another component, it can be directly located on the other component or there may be a centered component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0037] First, a brief introduction to the airflow control system of additive manufacturing equipment is given.

[0038] The airflow control system of additive manufacturing equipment is one of the core components to ensure the smooth progress of the printing process. In the 3D printing process, especially in metal additive manufacturing technology (such as laser selective melting), the metal powder material melts rapidly under the action of laser energy to form a molten pool. Due to local heating by the laser, the molten pool temperature usually exceeds the boiling temperature of the powder material, resulting in strong convection and steam recoil on the surface of the molten pool. The vaporized metal and entrained powder will be ejected from the molten pool and the surrounding powder, and the metal vapor will gradually condense into black smoke. The entrained powder will partially gather on the surface of the powder bed after ejection, affecting the appearance quality and performance of the parts.

[0039] Therefore, the airflow control system of the additive manufacturing device usually uses an airflow generating device such as an air compressor to quickly introduce airflow from the inlet 100 of the printing chamber 10, and maintain the environmental stability of the printing chamber 10 through the flow of airflow, thereby optimizing the printing quality and improving the performance of the three-dimensional object. Figure 1 As shown, Figure 1 A schematic diagram showing the effects of different airflows on three-dimensional objects in some embodiments of the present application is shown. Since the existing airflow generating device will form high-speed turbulence when introducing airflow through the inlet 100 of the printing chamber 10, although it can enhance gas exchange, improve heat dispersion efficiency and quickly take away impurities generated during processing and manufacturing, the strong airflow disturbance generated by the turbulence may lift up the laid powder layer, resulting in uneven or missing powder distribution, which not only affects the uniformity of each layer during the printing process, but may also cause a decrease in the geometric accuracy of the parts, and even form local defects; and high-speed turbulence may also destroy the thermal field stability in the printing chamber 10, resulting in uneven temperature field distribution, local overheating or insufficient cooling will cause changes in the shape of the molten pool or abnormal grain structure, thereby affecting the microstructure and mechanical properties of the powder material.

[0040] Therefore, in the actual implementation process, it is necessary to transform the turbulent flow introduced by the airflow generating device into a laminar flow field. The laminar flow field helps to stabilize the airflow environment in the printing chamber 10, optimize the thermal field distribution, and reduce the impact of smoke and entrained powder on printing quality.

[0041] Therefore, reference Figure 2-Figure 6 As shown, Figure 2 A schematic diagram showing the structure of an exemplary printing chamber 10 according to some embodiments of the present application is shown. Figure 3 is a first simulation schematic diagram of an exemplary fluid according to some embodiments of the present application, Figure 4 is a second simulation schematic diagram of an exemplary fluid according to some embodiments of the present application, Figure 5is a third simulation schematic diagram of an exemplary fluid according to some embodiments of the present application, Figure 6 1 is a schematic diagram of an exemplary arrangement structure of an interference part according to some embodiments of the present application. In some embodiments of the present application, the present application proposes a spoiler assembly 12 for forming a laminar wind field in a printing chamber 10, comprising one or more interference parts 121, which are arranged between the inlet 100 of the printing chamber 10 and the forming platform 11 at a preset angle and preset size, and are used to transform the turbulent flow introduced by the inlet 100 above the forming platform 11 into a laminar flow field of a specific size and flow rate and control the laminar flow field to flow along a preset height above the forming platform 11 to the outlet 101 of the printing chamber 10.

[0042] Specifically, the number of interference parts 121 is set by the operating personnel according to actual needs. It can be either an integral molding or a plurality of spliced ​​components. Specifically, one end of the interference part 121 is an open space 122, and the other end of the interference part 121 is a closed space 123; specifically, during installation, the interference part 121 is arranged between the inlet 100 of the printing chamber 10 and the forming platform 11 and the arrangement direction of the interference part 121 is consistent with the flow field above the forming platform 11, the open space 122 at one end of the interference part 121 faces the inlet 100 of the printing chamber 10, and the closed space 123 at the other end of the interference part 121 faces the forming platform 11; illustratively, the interference part 121 can be made of high-strength metal or high-temperature resistant polymer material.

[0043] In the actual implementation process, the specific preset angle is optimized by the operator by simulation of the inclination angle of the interference part 121 with the help of computational fluid dynamics (CFD) software to ensure that the turbulent flow is transformed into a smooth laminar flow after passing through the interference part 121, while maintaining a low pressure drop. The specific preset angle is set by the operator according to actual needs. For example, the preset angle is set between 10° and 60° relative to the airflow direction, preferably 45°, for flow guidance and rectification. The specific preset size is adjusted by the operator according to the specific size of the printing chamber 10 and the airflow parameters of the inlet 100, so that it covers the entire airflow cross section to prevent airflow deviation. Specifically, the specific size and flow rate are set by the operator after adjusting the angle and size of the interference part 121, that is, the operator selects a suitable angle of the interference part 121 according to the printing materials, process requirements and wind field parameters, and adjusts the length or width of the interference part 121 according to the required airflow velocity and target wind field size (if the laminar area width or height needs to be increased, the size of the interference part 121 is extended; if the airflow channel resistance needs to be reduced, the size of the interference part 121 is shortened to reduce the airflow distribution density). Specifically, the preset height is set by the operator by adjusting the ventilation gap position of a single interference part 121 or adjusting the ventilation gap position when multiple interference parts 121 are arranged vertically, to ensure that the laminar flow field flows along the set height above the forming platform 11 to avoid affecting powder deposition or laser melting. For example, the preset height can be set to a height area range of 5 to 20 mm above the forming platform 11, for example

[0044] Any range between 5mm and 20mm, such as 5mm~10mm, 5mm~15mm, etc.

[0045] For example, in some examples of the present application, a single interference portion 121 is provided. The single interference portion 121 is formed by integrating multiple components and a ventilation gap is provided at a preset height to facilitate adjustment of the flow height of the laminar flow field.

[0046] Exemplarily, in some examples of the present application, a plurality of interference parts are provided, and the plurality of interference parts are arranged in an array along the vertical direction of the printing chamber 10, and a preset height interval is set between the plurality of interference parts to form a ventilation gap, so as to adjust the flow height of the laminar flow field.

[0047] Exemplarily, in some examples of the present application, a plurality of interference parts are provided, a portion of the interference parts are arranged in an array along the vertical direction of the printing chamber 10, and another portion of the interference parts are arranged in an array along the length direction of the printing chamber 10, and ventilation gaps of the same or different heights are provided between the plurality of interference parts, which can not only facilitate the adjustment of the flow height of the laminar flow field, but also further improve the interference effect on the turbulence, thereby improving the efficiency of the transformation of turbulence into laminar flow.

[0048] Among them, the above-mentioned further improvement of the interference effect on turbulence means: setting a plurality of interference parts in an array arrangement along the length direction of the printing chamber 10, arranged in sequence from the inlet 100 to the forming platform 11, and forming a corresponding interference space between each interference part, and each interference part is provided with ventilation gaps of the same or different heights. When turbulence passes through multiple ventilation gaps, the interference effect can be improved.

[0049] refer to Figure 7 As shown, Figure 7 A schematic diagram of the structure of an exemplary interference part array of some embodiments of the present application is shown. Exemplarily, for example: 3 interference parts are arranged in an array along the length direction of the printing chamber 10, interference part I121a is set with a ventilation gap of a first height value, interference part II121b is set with a ventilation gap of a second height value, interference part III121c is set with a ventilation gap of a third height value, wherein the third height value matches the flow height of the laminar flow field, and the first height value, the second height value and the third height value can be the same or different; a first interference space 121e is formed between interference part I121a and interference part II121b, and a second interference space 121f is formed between interference part II121b and interference part III121c, thereby, turbulence from the ventilation of interference part I121a The gap enters the first interference space 121e, and the first interference space 121e interferes with the turbulence for the first time. At this time, the turbulence is disturbed, and the Reynolds number gradually decreases. The disturbed turbulence enters the second interference space 121f through the ventilation gap of the interference part II121b, and the second interference space 121f interferes with the disturbed turbulence for the second time. At this time, the turbulent flow after the second disturbance is gradually transformed into a low-speed laminar flow. The laminar flow flows along the forming platform 11 to the outlet 101 through the ventilation gap of the interference part III121c. At the same time, the ventilation gap of the interference part III121c adjusts the transformed laminar flow field to the required flow height, thereby improving the efficiency of turbulence transformation into laminar flow through multiple interferences.

[0050] Therefore, the working principle of the spoiler assembly 12 for forming a laminar wind field in the printing chamber 10 of the present application is:

[0051] The turbulent airflow entering from the inlet 100 of the printing chamber 10 is disturbed by the angle and size of one or more interference parts 121 when passing through one or more interference parts, and the flow direction and speed change, thereby preliminarily eliminating large-scale eddies; and then, when the airflow passes through one or more interference parts 121, its flow velocity gradient gradually tends to be uniform, so that the turbulence caused by the inertial effect is weakened, and a stable laminar flow field with a viscous effect is formed; and then, through the position of the vent opening opened by a single interference part, or the spacing when multiple interference parts are arrayed, the laminar flow field is made to flow at a preset height above the forming platform 11, so that the laminar flow field flows out through the outlet 101 of the printing chamber 10.

[0052] In some embodiments of the present application, the one or more interference parts 121 are installed in a preset structure between the inlet 100 and the forming platform 11, and the open space 122 at one end of the one or more interference parts 121 faces the inlet 100 of the printing chamber 10, and the closed space 123 at the other end of the one or more interference parts 121 faces the forming platform 11.

[0053] In the actual implementation process, if a single interference part is set, an integrally formed interference part is set, and the single interference part is a first interference end and a second interference end, and the first interference end and the second interference end are at a preset angle to form a preset structure. If multiple interference parts are set and a single-layer interference is formed, a separately connected interference part can be set, and the first interference part and the second interference part are connected at a preset angle to form a preset structure. If multiple interference parts are set and multi-layer interference is formed, a separately connected interference part can be set and the multiple separately connected interference parts can be arranged in an array along the length direction of the printing chamber 10, that is, arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are at a preset angle to form a preset structure.

[0054] refer to Figure 8 As shown, Figure 8 A schematic diagram of the structure of an exemplary V-shaped interference part of some embodiments of the present application is shown. In some examples of the present application, the one or more interference parts are installed in a V-shaped structure between the inlet 100 and the forming platform 11, and the open space 122 at one end of the V-shaped interference part 120-1 faces the inlet 100 of the printing chamber 10, and the closed space 123 at the other end of the V-shaped interference part 120-1 faces the forming platform 11.

[0055] In the actual implementation process, reference Figure 8 As shown in a, Figure 8 a shows a schematic diagram of the structure of an exemplary single V-shaped interference part 120-1 of the present application. If a single interference part is provided, an integrally formed V-shaped interference part 120-1 is provided. The V-shaped interference part 120-1 is divided into a first interference end 120-1a and a second interference end 120-1b. The first interference end 120-1a and the second interference end 120-1b are at a preset angle to form a V-shaped structure in which the open space 122 faces the inlet 100 and the closed space 123 faces the forming platform 11. Reference Figure 8 As shown in b, Figure 8 b shows a schematic diagram of the structure of multiple single-layer V-shaped interference parts 120-1 of the present application. If multiple interference parts are set to form a single-layer interference, it can be referred to Figure 8As shown in FIG. 1( b ), a split interference part is provided, and the first interference part 1201 and the second interference part 1202 are connected at a preset angle to form a V-shaped structure in which the open space 122 faces the inlet 100 and the closed space 123 faces the forming platform 11; Figure 8 As shown in b(2), vertically connected interference parts are provided, and the first interference part 1201 is connected to the second interference part 1202 to form a V-shaped structure in which the open space 122 faces the inlet 100 and the closed space 123 faces the forming platform 11. Figure 8 As shown in c, Figure 8 c shows a schematic structural diagram of an exemplary multiple multi-layer V-shaped structure interference part 1203 of the present application. If multiple interference parts are set up and multi-layer interference is formed, separately connected interference parts can be set up and the multiple separately connected interference parts can be arranged in an array along the length direction of the printing chamber 10, that is, they are arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are arranged at a preset angle to form a V-shaped structure in which the open space 122 faces the inlet 100 and the closed space 123 faces the forming platform 11.

[0056] refer to Fig. 9 As shown, Fig. 9 A schematic diagram of the structure of an exemplary W-shaped interference part of some embodiments of the present application is shown. In some examples of the present application, the one or more interference parts are installed in a W-shaped structure between the inlet 100 and the forming platform 11, and the open space 122 at one end of the W-shaped interference part 120-2 faces the inlet 100 of the printing chamber 10, and the closed space 123 at the other end of the W-shaped interference part 120-2 faces the forming platform 11.

[0057] In the actual implementation process, reference Fig. 9 As shown in a, Fig. 9 a shows a schematic diagram of the structure of an exemplary single W-shaped structure interference part 120-2 of the present application. If a single interference part is set, an integrally formed W-shaped structure interference part 120-2 is set, and the W-shaped structure interference part 120-2 is divided into a first interference end 120-2a, a second interference end 120-2b and a third interference end

[0058] 120-2c, the first interference end 120-2a and the second interference end 120-2b, and the second interference end 120-2b and the third interference end 120-2c are at a preset angle to form a W-shaped structure in which the first open space 1215 and the second open space 1216 face the inlet 100, and the first closed space 1217 and the second closed space 1218 face the forming platform 11. Fig. 9 As shown in b, Fig. 9b shows a schematic diagram of the structure of multiple single-layer W-shaped interference parts 120-2 of the present application. If multiple interference parts are set to form a single-layer interference, separate interference parts can be set. The first interference part 1211 and the second interference part 1212, the third interference part 1213 and the fourth interference part 1214 are connected at a preset angle and the second interference part 1212 is connected to the third interference part 1213 to form a W-shaped structure in which the first open space 1215 and the second open space 1216 face the inlet 100, and the first closed space 1217 and the second closed space 1218 face the forming platform 11. Reference Fig. 9 As shown in c, Fig. 9 c shows a schematic structural diagram of an exemplary multiple multi-layer W-shaped structure interference part 1219 of the present application. If multiple interference parts are set up and multi-layer interference is formed, separately connected interference parts can be set up and the multiple separately connected interference parts can be arranged in an array along the length direction of the printing chamber 10, that is, they are arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are arranged at a preset angle to form a W-shaped structure in which the first open space 1215 and the second open space 1216 face the inlet 100, and the first closed space 1217 and the second closed space 1218 face the forming platform 11.

[0059] refer to Fig.10 As shown, Fig.10 A schematic diagram of the structure of an exemplary arc-shaped interference part of some embodiments of the present application is shown. In some examples of the present application, the one or more interference parts are installed in an arc-shaped structure between the inlet 100 and the forming platform 11, and the open space 122 at one end of the arc-shaped interference part 120-3 faces the inlet 100 of the printing chamber 10, and the closed space 123 at the other end of the arc-shaped interference part 120-3 faces the forming platform 11.

[0060] In the actual implementation process, reference Fig.10 As shown in a, Fig.10 a shows a schematic diagram of the structure of an exemplary single arc-shaped structure interference part 120-3 of the present application. If a single interference part is set, an integrally formed arc-shaped structure interference part 120-3 is set. The arc-shaped structure interference part 120-3 is divided into a first interference end 120-3a and a second interference end 120-3b. There is a preset arc between the first interference end 120-3a and the second interference end 120-3b to form an arc structure with an open space 122 facing the inlet 100 and a closed space 123 facing the forming platform 11. Reference Fig.10 As shown in b, Fig.10b shows a schematic diagram of the structure of multiple single-layer arc-shaped interference parts 120-3 of the present application. If multiple interference parts are set to form a single-layer interference, a separately connected interference part can be set. The first interference part 1231 and the second interference part 1232 are connected to form a preset arc to form an arc structure with a partially or fully arc-shaped open space 122 facing the inlet 100 and a closed space 123 facing the forming platform 11. Fig.10 As shown in c, Fig.10 c shows a schematic structural diagram of an exemplary multiple multi-layer arc-shaped structure interference part 1233 of the present application. If multiple interference parts are set and multi-layer interference is formed, a separately connected interference part can be set and the multiple separately connected interference parts can be arranged in an array along the length direction of the printing chamber 10, that is, arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are presented in a predetermined arc to form an arc structure with an open space 122 of a partial or full arc surface facing the inlet 100 and a closed space 123 facing the forming platform 11.

[0061] Therefore, by analogy, one or more interference parts can also be set to a wavy structure, an irregular structure, etc., which is specifically set by the operating personnel according to actual needs and costs.

[0062] In some embodiments of the present application, the one or more interference parts 121 are installed at a preset height between the inlet 100 and the forming platform 11 .

[0063] Specifically, the height of one or more interference parts 121 is set by the operator according to actual needs. The top of the interference part 121 can be connected to the top of the inside of the printing chamber 10, the bottom of the interference part 121 can be connected to the bottom of the inside of the printing chamber 10, or the interference part can be set to a specific height.

[0064] In the actual implementation process, if a single interference part is set, the single interference part can be connected to the top and bottom of the inside of the printing chamber 10 respectively, or the single interference part can be set to a specific height size. If multiple interference parts are set and a single layer of interference is formed, the separately connected interference parts can be connected to the top and bottom of the inside of the printing chamber 10 respectively, or the separately connected interference parts can be set to a specific height size. If multiple interference parts are set and multiple layers of interference are formed, all the separately connected interference parts can be connected to the top and bottom of the inside of the printing chamber 10 respectively, or a part of the separately connected interference parts can be connected to the top and bottom of the inside of the printing chamber 10 respectively, and another part of the separately connected interference parts can be set to a specific height size, or all the separately connected interference parts can be set to a specific height size, refer to Fig.11 As shown, Fig.11A schematic diagram showing the structure of an exemplary array of multiple interference parts of different heights according to some embodiments of the present application.

[0065] refer to Fig.12 As shown, Fig.12 A schematic diagram of the structure of an exemplary angle adjustment component and an interference part of some embodiments of the present application is shown. In some embodiments of the present application, the spoiler component 12 of the present application also includes one or more angle adjustment components 124, and the one or more angle adjustment components 124 are connected to the one or more interference parts 121, and are used to adjust the one or more interference parts 121 to a preset angle.

[0066] Specifically, the angle adjustment component 124 can be any form of driving structure as long as it can drive one or more interference parts 121 to move to a preset angle, including but not limited to a driving structure that provides reciprocating rotation power, such as a servo motor and a rotary cylinder. In this application, reference is made to the combination of a servo motor and a rotating shaft, wherein a high-precision servo motor is selected to ensure the accuracy of the angle adjustment, one end of the rotating shaft is connected to the output end of the servo motor through a coupling, and the other end passes through the connection point of the interference part and moves synchronously with the interference part 121 through a fixing device (such as a buckle or a threaded interface), and an angle sensor (such as an optical encoder) is installed at the end of the servo motor shaft to monitor the actual angle of the interference part 121 in real time; the specific working principle is: the servo motor drives the rotating shaft to rotate through the coupling, and the rotating shaft synchronously drives the interference part 121 to rotate to the target angle, and the angle sensor monitors the current angle of the interference part in real time and compares it with the target value. If there is a deviation, the servo motor is used for fine-tuning until the angle error is within the allowable range. After the target angle is reached, the servo motor enters a locked state to prevent the interference part from shaking due to the influence of airflow, thereby completing the angle adjustment of one or more interference parts 121.

[0067] In the actual implementation process, if a single interference part is provided, an integrally formed interference part is provided, and the single interference part is a first interference end and a second interference end, and the first interference end and the second interference end are integrally formed to form a preset angle, and the driving end of the angle adjustment component 124 is connected to the single interference part, and the single interference part is driven to rotate to a preset angle position by the angle adjustment component 124 to form a preset structure. If multiple interference parts are provided and a single-layer interference is formed, a separately connected interference part can be provided, and the first interference part is connected to the first angle adjustment component, and the second interference part is connected to the second angle adjustment component, and the first interference part is driven to move by the first angle adjustment component and the second interference part is driven to move by the second angle adjustment component, so as to adjust the first interference part to a preset angle with the second interference part, so as to form a preset structure. If multiple interference parts are set up and multi-layer interference is formed, separately connected interference parts can be set up and the multiple separately connected interference parts can be arranged in an array along the length direction of the printing chamber 10, that is, arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are respectively connected to the angle adjustment components 124, and the angle of each interference part is adjusted in sequence through the angle adjustment component 124 to adjust the separately connected interference parts to a preset angle to form a preset structure.

[0068] refer to Fig.13 As shown, Fig.13 A schematic diagram of a structure in which a protrusion is provided on an exemplary interference portion of some embodiments of the present application is shown. In some embodiments of the present application, the spoiler assembly 12 of the present application further includes one or more protrusions 125, which are arranged at a preset angle in the open space 122 of the one or more interference portions 121, and the one or more protrusions 125 are used to reduce the Reynolds coefficient of turbulence and improve the efficiency of turbulence transformation to form a laminar flow field.

[0069] Specifically, the protrusion 125 can be set to a hemispherical, conical or prism shape (regular shape) or a randomly distributed spur structure (irregular shape), etc., to reduce the local turbulent area caused by turbulence, and the surface of the protrusion 125 can be roughened according to actual needs, such as selecting a material with a high friction coefficient; the size, style and material of the specific protrusion 125 are set by the operator according to actual needs and the protrusion 125 is arranged at one end of the open space of the interference part according to the required setting angle to guide the direction of the airflow and reduce turbulence. The arrangement form includes linear arrangement, matrix arrangement or spiral arrangement. The specific working principle is: when the turbulent flow passes through the protrusion 125, the surface of the protrusion 125 guides the turbulent flow to change direction and after the turbulent flow passes through the protrusion 125, a secondary airflow will be generated. The secondary airflow generated can disperse the fluid energy in the turbulent area, further reduce the Reynolds coefficient of the turbulent flow, and make it transition to laminar flow faster, and then ensure that the streamlines of the laminar flow are more uniform and maintain a stable flow rate and direction through the setting angle of the protrusion 125.

[0070] In actual implementation, if a single protrusion 125 is provided, then Fig.13 As shown, a protrusion layer is coated or attached to one end of the open space of the interference part, and the protrusion layer is provided with a plurality of regular or irregular protrusions for increasing the friction resistance; if multiple protrusions 125 are provided, then refer to Fig.14 As shown, Fig.14 It is a schematic structural diagram of an exemplary interference portion provided with a raised layer according to some embodiments of the present application; a plurality of raised portions 125 are arranged in an array along a preset direction at one end of the open space of the interference portion and combined to form a rough layer for increasing the friction resistance, thereby forming a multi-point resistance network through the rough layer; the preset direction can be set in the direction of turbulent airflow to form a continuous resistance to turbulence.

[0071] Therefore, in some embodiments of the present application, the present application also relates to a turbulence control method for forming a laminar wind field in a printing chamber 10, the method comprising:

[0072] A high-speed airflow is introduced from the inlet 100 of the printing chamber 10 by an airflow generating device, and the high-speed airflow forms a turbulent flow through the inlet 100 of the printing chamber 10;

[0073] The turbulent flow introduced by the inlet 100 is dispersed under the action of one or more interference parts, gradually reducing the Reynolds coefficient of the turbulent flow and guiding the turbulent flow with gradually reduced Reynolds coefficient to flow toward the forming platform 11 along a set direction;

[0074] After the Reynolds coefficient of the turbulent flow gradually decreases to the lower critical Reynolds coefficient, the turbulent flow reverses above the forming platform 11 and gradually transforms into a stable laminar flow, thereby forming a laminar flow field with a specific size and flow velocity;

[0075] The laminar flow field is guided by the ventilation gaps of one or more interference parts and flows along a preset height above the forming platform 11 to the outlet 101 of the printing chamber 10 .

[0076] Among them, the position and shape of the outlet 101 of the printing chamber 10 can also be set to ensure that the laminar flow maintains a stable flow state at the outlet 101, and a flow regulating valve or a guide net is set at the outlet 101 to avoid turbulent backflow of the laminar flow at the outlet 101; further, a filter and dust removal equipment can also be set at the outlet 101 to remove particles carried by the recycled airflow.

[0077] In some embodiments of the present application, when forming a laminar flow field of a specific size and flow rate, the method further includes:

[0078] One or more interference parts are arranged at a preset angle under the adjustment of the angle adjustment component 124;

[0079] The turbulent flow is dispersed under the action of the interference part arranged at a preset angle, gradually reducing the Reynolds coefficient of the turbulent flow and guiding the turbulent flow with gradually reduced Reynolds coefficient to flow toward the forming platform 11 along a set direction;

[0080] After the Reynolds coefficient of the turbulent flow gradually decreases to the lower critical Reynolds coefficient, the turbulent flow reverses above the forming platform 11 and gradually transforms into a stable laminar flow, thereby forming a laminar flow field with a specific size, flow velocity and angle;

[0081] The laminar flow field is guided by the ventilation gaps of one or more interference parts and flows along a preset height above the forming platform 11 to the outlet 101 of the printing chamber 10 .

[0082] Furthermore, a real-time sensor (such as a flow rate sensor) is arranged in the printing chamber 10 to monitor the directional change of the laminar flow field. If the laminar flow field deviates from the preset angle, the real-time sensor detects the deviation and sends a signal to the control system of the additive device. The control system controls the angle adjustment component 124 to dynamically adjust the angle of one or more interference parts so that the laminar flow field maintains flowing along a specific size, flow rate and angle.

[0083] Therefore, reference Figure 2 In some embodiments of the present application, the present application also relates to an additive manufacturing device having the spoiler component 12, further comprising:

[0084] The printing chamber 10 is provided with an inlet 100 , an outlet 101 and a forming platform 11 . The inlet 100 is set in a preset pattern for introducing turbulent flow into the printing chamber 10 ; the outlet 101 is used for exporting the disturbed laminar flow field out of the printing chamber 10 .

[0085] Among them, the inlet 100 of the printing chamber 10 can be set to a regular or irregular shape such as a slit type, a honeycomb type, a round type, a square type, etc., to initially reduce the initial intensity of the turbulence and achieve preliminary uniform adjustment. The shape of the outlet 101 of the printing chamber 10 can be set to a regular or irregular shape such as a slit type, a diffusion type, a round type, a square type, etc., to slow down the air flow speed and prevent laminar turbulence, thereby controlling the uniform discharge of the laminar flow field. Furthermore, a filter and a dust removal device can also be set at the outlet 101 to remove particles carried by the recycled airflow.

[0086] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

[0087] Description of reference numerals:

[0088] 10. Printing chamber, 11. Forming platform, 12. Spoiler assembly, 100. Inlet, 101. Outlet, 121. Interference part, 121a. Interference part I, 121b. Interference part II, 121c. Interference part III, 121d. Ventilation gap, 121e. First interference space, 121f. Second interference space, 122. Open space, 123. Closed space, 124. Angle adjustment assembly, 125. Raised part, 120-1. V-shaped structure interference part, 120-1a. First interference end, 120-1b. Second interference end, 1201. First interference part, 1202. Second interference part, 1203. Multi-layer V-shaped structure interference part, 120-2. W-shaped structure interference part, 120-2a. First interference end, 12 0-2b, the second interference end, 120-1c, the third interference end, 1211, the first interference part, 1212, the second interference part, 1213, the third interference part, 1214, the fourth interference part, 1215, the first open space, 1216, the second open space, 1217, the first closed space, 1218, the second closed space, 1219, the multi-layer W-type structure interference part, 120-3, the arc-shaped structure interference part, 120-3a, the first interference end, 120-3b, the second interference end, 1231, the first interference part, 1232, the second interference part, 1233, the multi-layer arc-shaped structure interference part, 1240, the first height interference part, 1241, the second height interference part, 1242, the third height interference part, 1251, the raised layer.

Claims

1. A spoiler assembly (12) for forming a laminar wind field in a printing chamber (10), characterized in that: include: One or more interference parts (121) are arranged between the inlet (100) of the printing chamber (10) and the forming platform (11) at a preset angle and preset size, and are used to transform the turbulent flow introduced by the inlet (100) above the forming platform (11) into a laminar flow field of specific size and flow rate and control the laminar flow field to flow along a preset height above the forming platform (11) to the outlet (101) of the printing chamber (10).

2. The spoiler assembly (12) according to claim 1, characterized in that: The one or more interference parts (121) are installed in a preset structure between the inlet (100) and the forming platform (11).

3. The spoiler assembly (12) according to claim 2, characterized in that: The one or more interference parts (121) are installed in a V-shaped structure between the inlet (100) and the forming platform (11).

4. The spoiler assembly (12) according to claim 3, characterized in that: The cross section of one or more interference parts (121) of the V-shaped structure is at a preset angle.

5. The spoiler assembly (12) according to claim 2, characterized in that: The one or more interference parts (121) are partially or completely arc-shaped structures and are installed between the inlet (100) and the forming platform (11).

6. The spoiler assembly (12) according to claim 2, characterized in that: The one or more interference parts (121) are installed in a W-shaped structure between the inlet (100) and the forming platform (11).

7. The spoiler assembly (12) according to any one of claims 1 to 6, characterized in that: The open space (122) of the one or more interference parts (121) is close to the inlet (100), and the closed space (123) of the one or more interference parts (121) is close to the forming platform (11).

8. The spoiler assembly (12) according to claim 1, characterized in that: The one or more interference parts (121) are installed at a preset height between the inlet (100) and the forming platform (11).

9. The spoiler assembly (12) according to any one of claims 1 to 6 or 8, characterized in that: Also includes: An angle adjustment component (124) is connected to the one or more interference parts (121) and is used to adjust the one or more interference parts (121) to a preset angle.

10. The spoiler assembly (12) according to claim 9, characterized in that: The angle adjustment component (124) is installed between the inlet (100) and the forming platform (11) and adjusts the one or more interference parts (121) to a preset angle to form a preset structure, and the open space (122) of the preset structure is close to the inlet (100), and the closed space (123) of the preset structure is close to the forming platform (11).

11. The spoiler assembly (12) according to any one of claims 1 to 6 or 8 or 10, characterized in that: Also includes: One or more protrusions (125) are arranged at a preset angle in the open space (122) of the one or more interference parts (121), and the one or more protrusions (125) are used to reduce the Reynolds coefficient of turbulence and improve the efficiency of turbulence transformation to form a laminar flow field.

12. The spoiler assembly (12) according to claim 11, characterized in that: A plurality of protrusions (125) are arranged in an array along a preset direction of the open space (122) of the one or more interfering parts (121) and are combined to form a rough layer that increases friction resistance.

13. A spoiler control method using the spoiler assembly (12) according to any one of claims 1 to 12, characterized in that: The method comprises: Transforming the turbulent flow introduced into the inlet (100) of the printing chamber (10) into a laminar flow field with a specific size and flow rate above the forming platform (11); The laminar flow field is controlled to flow along a preset height above the forming platform (11) to an outlet (101) of the printing chamber (10).

14. The method according to claim 13, characterized in that When forming a laminar flow field of a specific size and flow rate, the method further comprises: The laminar flow field is controlled to flow along a preset angle and a preset height above the forming platform (11) to an outlet (101) of the printing chamber (10).

15. An additive manufacturing device having a spoiler assembly (12) according to any one of claims 1 to 12, characterized in that: Also includes: A printing chamber (10) is provided with an inlet (100), an outlet (101) and a forming platform (11), wherein the inlet (100) is arranged in a preset pattern for introducing turbulent flow into the printing chamber (10); and the outlet (101) is used for exporting the disturbed laminar flow field out of the printing chamber (10).

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