Printing cabin and additive manufacturing apparatus

Abstract

The utility model provides a printing cabin (10) and additive manufacturing equipment. The printing cabin (10) comprises an inlet (100); an outlet (101); a forming platform (11) mounted between the inlet (100) and the outlet (101); one or more interference parts (121) arranged at a preset angle and a preset size between the inlet (100) of the printing cabin (10) and the forming platform (11), 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). The printing cabin (10) can convert guided-in high-speed turbulent flow 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 particularly to a printing cabin forming a laminar flow field and an additive manufacturing equipment. BACKGROUND

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

[0003] At present, although the high-speed turbulent flow helps to enhance gas exchange and improve heat dispersion efficiency, the strong air flow disturbance generated by the high-speed turbulent flow may lift the laid powder layer, resulting in uneven distribution or absence of the powder or causing impurities on the surface of the three-dimensional object, which not only affects the uniformity of each layer in the printing process, but also causes the decline of the geometric precision of the part, and even forms local defects. Moreover, under the action of the turbulent velocity gradient, the powder material may agglomerate or excessively diffuse. The agglomerated powder material will affect the compactness and mechanical properties of the powder material, and the excessive diffusion may cause waste of the powder material or reduce the deposition efficiency. CONTENT OF THE UTILITY MODEL

[0004] The present application provides a printing cabin forming a laminar flow field and an additive manufacturing equipment, which can convert the introduced high-speed turbulent flow into low-speed laminar flow to reduce the influence of high-speed turbulent flow on the forming quality of the three-dimensional object.

[0005] In a first aspect, the present application provides a printing cabin forming a laminar flow field, comprising: an inlet; an outlet; a forming platform installed between the inlet and the outlet; one or more interference parts arranged in a preset structure between the inlet and the forming platform, used for reversing the turbulent flow introduced by the inlet to form a laminar flow field of a specific size and flow rate above the forming platform and guiding the laminar flow field to flow to the outlet along a preset height above the forming platform.

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

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

[0008] In an alternative of the first aspect, the one or more interference portions are arranged at a preset angle.

[0009] In an alternative of the first aspect, the one or more interference portions are arranged in a partial or full arc surface structure between the inlet and the forming platform.

[0010] In an alternative of the first aspect, the one or more interference portions are arranged in a W-shaped structure between the inlet and the forming platform.

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

[0012] In an alternative of the first aspect, the one or more interference portions are arranged at a preset height between the inlet and the forming platform.

[0013] In an alternative of the first aspect, further comprising: an angle adjusting assembly connected to the one or more interference portions, the angle adjusting assembly being used to adjust the one or more interference portions to a preset angle.

[0014] In an alternative of the first aspect, the angle adjusting assembly is arranged between the inlet and the forming platform and adjusts the one or more interference portions 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 alternative of the first aspect, further comprising: one or more protrusions arranged in the open space of the one or more interference portions at a preset angle, used to reduce the Reynolds coefficient of the turbulent flow and improve the efficiency of the turbulent reverse transition to form a laminar flow field.

[0016] In an alternative of the first aspect, a plurality of protrusions are arranged in an array in a preset direction of the open space of the one or more interference portions and combined to form a rough layer that improves the frictional resistance.

[0017] In a second aspect, the present application provides an additive manufacturing device with the printing cabin.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above utility model content and the following description can be better understood in combination with the accompanying drawings, in which:

[0020] Figure 1An exemplary schematic diagram showing the effect of different air flows on a three-dimensional object according to some embodiments of the application.

[0021] Figure 2 An exemplary schematic diagram of a print chamber according to some embodiments of the application.

[0022] Figure 3 An exemplary first simulation of a fluid according to some embodiments of the application.

[0023] Figure 4 An exemplary second simulation of a fluid according to some embodiments of the application.

[0024] Figure 5 An exemplary third simulation of a fluid according to some embodiments of the application.

[0025] Figure 6 An exemplary schematic diagram of an interference part arrangement according to some embodiments of the application.

[0026] Figure 7 An exemplary schematic diagram of an interference part array according to some embodiments of the application.

[0027] Figure 8 An exemplary schematic diagram of a V-shaped interference part according to some embodiments of the application; wherein, Figure 8 a is a schematic diagram of a single V-shaped interference part, Figure 8 b(1) is a first connection schematic diagram of a plurality of single-layer V-shaped interference parts, Figure 8 b(2) is a second connection schematic diagram of a plurality of single-layer V-shaped interference parts, Figure 8 c is a schematic diagram of a plurality of multi-layer V-shaped interference parts.

[0028] Figure 9 An exemplary schematic diagram of a W-shaped interference part according to some embodiments of the application; wherein, Figure 9 a is a schematic diagram of a single W-shaped interference part, Figure 9 b is a connection schematic diagram of a plurality of single-layer W-shaped interference parts, Figure 9 c is a schematic diagram of a plurality of multi-layer W-shaped interference parts.

[0029] Figure 10 An exemplary schematic diagram of an arc-shaped interference part according to some embodiments of the application; wherein, Figure 10 a(1) is a schematic diagram of a single full-arc-shaped interference part, Figure 10 a(2) is a schematic diagram of a single partial-arc-shaped interference part, Figure 10b is a schematic diagram of a connecting structure of a plurality of single-layer arc-shaped interference parts, Figure 10 c is a schematic diagram of a structure of a plurality of multi-layer arc-shaped interference parts.

[0030] Figure 11 is a schematic diagram of an exemplary array of a plurality of interference parts of different heights according to some embodiments of the present application.

[0031] Figure 12 is a schematic diagram of a connecting structure of an angle adjustment assembly and an interference part according to some embodiments of the present application.

[0032] Figure 13 is a schematic diagram of a structure of a protrusion part for interference part according to some embodiments of the present application.

[0033] Figure 14 is a schematic diagram of a structure of a protrusion layer for interference part according to some embodiments of the present application. DETAILED DESCRIPTION

[0034] The embodiments of the present application will be described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments of the present application. 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 can be a middle component. When a component is considered to be "provided on" another component, it can be directly provided on the other component or there can be a middle component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0035] First, the gas flow control system of the additive manufacturing equipment is briefly introduced.

[0036] The gas flow control system of the 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 the metal additive manufacturing technology (such as laser selective melting), the metal powder material is rapidly melted and forms a molten pool under the action of laser energy. Due to local heating by laser, the temperature of the molten pool will usually exceed the boiling temperature of the powder material, resulting in the formation of strong convection and vapor back pressure on the surface of the molten pool. The vaporized metal and the entrained powder will be ejected from the molten pool and the surrounding powder. The metal vapor will gradually condense into black smoke, and the entrained powder will partially accumulate on the surface of the powder bed after being ejected, affecting the appearance quality and performance of the part.

[0037] Therefore, the airflow control system of the additive manufacturing equipment usually adopts an airflow generating device such as an air compressor to quickly introduce the airflow from the inlet 100 of the printing cabin 10, maintain the environmental stability of the printing cabin 10 through the airflow flow, and thus optimize the printing quality and improve the performance of the three-dimensional object. However, referring to Figure 1 Figure 1 An exemplary schematic diagram showing the influence of different airflows on a three-dimensional object according to some embodiments of the present application is shown. Since the existing airflow generating device forms a high-speed turbulent flow when introducing the airflow through the inlet 100 of the printing cabin 10, although it can enhance gas exchange, improve heat dispersion efficiency, and quickly remove impurities generated during processing and manufacturing, the strong airflow disturbance caused by the turbulent flow may lift 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 also may cause the decline of the geometric precision of the part, and even form local defects; and the high-speed turbulent flow may also destroy the thermal field stability in the printing cabin 10, resulting in uneven temperature field distribution, and local overheating or insufficient cooling may cause the change of the molten pool shape or abnormal grain structure, and thus affect the microstructure and mechanical properties of the powder material.

[0038] Therefore, in actual implementation, it is necessary to convert the turbulent flow introduced by the airflow generating device into a laminar flow field, which helps to stabilize the airflow environment in the printing cabin 10, optimizes the thermal field distribution, and reduces the influence of smoke and entrained powder on the printing quality.

[0039] Therefore, referring to Figures 2-6 Figure 2 An exemplary structural schematic diagram of a printing cabin 10 according to some embodiments of the present application is shown, Figure 3 is an exemplary first simulation schematic diagram of a fluid according to some embodiments of the present application, Figure 4 is an exemplary second simulation schematic diagram of a fluid according to some embodiments of the present application, Figure 5 is an exemplary third simulation schematic diagram of a fluid according to some embodiments of the present application, Figure 6 is an exemplary arrangement structure schematic diagram of an interference part according to some embodiments of the present application. In some embodiments of the present application, a printing cabin 10 forming a laminar flow field is proposed, which includes one or more interference parts 121 arranged between the inlet 100 of the printing cabin 10 and the forming platform 11 at a preset angle and a preset size, for converting the turbulent flow introduced by the inlet 100 into a laminar flow field of a specific size and flow rate above the forming platform 11 and controlling the laminar flow field to flow to the outlet 101 of the printing cabin 10 along a preset height above the forming platform 11.

[0040] ​​Specifically, the number of interference parts 121 is set by the operating personnel according to actual needs. It can be either integrally formed or composed of several spliced ​​parts. 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.

[0041] In actual implementation, the specific preset angle is optimized by the operator using computational fluid dynamics (CFD) software to simulate the inclination of the interference portion 121, ensuring that turbulent flow is transformed into smooth laminar flow after passing through the interference portion 121, while maintaining a low pressure drop. The specific setting is determined by the operator based on 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 dimensions are adjusted by the operator based on the specific dimensions of the printing chamber 10 and the airflow parameters of the inlet 100, and the width and length of the interference portion 121 are adjusted to cover the entire airflow cross-section and 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 material, 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 height set 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

[0042] Any range between 5mm and 20mm, such as 5mm~10mm, 5mm~15mm, etc.

[0043] For example, in some examples of the present application, a single interference portion 121 is provided. The single interference portion 121 is formed by integrally molding multiple components and a ventilation gap is provided at a preset height to facilitate adjustment of the flow height of the laminar flow field.

[0044] Exemplarily, in some examples of the present application, a plurality of interference portions are arranged along the vertical direction of the printing cabin 10, and a preset height gap is arranged between the plurality of interference portions to form a ventilation gap, so as to adjust the flow height of the laminar flow field.

[0045] Exemplarily, in some examples of the present application, a plurality of interference portions are arranged, a part of the interference portions are arranged along the vertical direction of the printing cabin 10, and another part of the interference portions are arranged along the length direction of the printing cabin 10, and ventilation gaps of the same or different heights are arranged between the plurality of interference portions, 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 turbulent flow, thereby improving the efficiency of the turbulent flow into the laminar flow.

[0046] The above-mentioned further improvement of the interference effect on the turbulent flow refers to that the plurality of interference portions are arranged along the length direction of the printing cabin 10 and arranged in sequence from the inlet 100 to the forming platform 11, and a corresponding interference space is formed between each interference portion, and the ventilation gaps of the same or different heights are arranged in each interference portion, which can improve the interference effect when the turbulent flow passes through the plurality of ventilation gaps.

[0047] Reference Figure 7 As shown, Figure 7 An exemplary interference portion array structure schematic diagram of some embodiments of the present application is shown. Exemplarily, for example, three interference portions are arranged along the length direction of the printing cabin 10, the interference portion I 121a is arranged with a ventilation gap of a first height value, the interference portion II 121b is arranged with a ventilation gap of a second height value, and the interference portion III 121c is arranged 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; the first interference space 121e is formed between the interference portion I 121a and the interference portion II 121b, and the second interference space 121f is formed between the interference portion II 121b and the interference portion III 121c, thereby the turbulent flow enters the first interference space 121e from the ventilation gap of the interference portion I 121a, the first interference space 121e performs the first interference on the turbulent flow, at this time the turbulent flow is disturbed and the Reynolds number gradually decreases, the disturbed turbulent flow enters the second interference space 121f from the ventilation gap of the interference portion II 121b, the second interference space 121f performs the second interference on the disturbed turbulent flow, at this time the twice disturbed turbulent flow gradually changes into the low-speed laminar flow, the laminar flow flows along the forming platform 11 to the outlet 101 from the ventilation gap of the interference portion III 121c, and the ventilation gap of the interference portion III 121c adjusts the laminar flow field changed into the laminar flow to the required flow height, so as to improve the efficiency of the turbulent flow into the laminar flow through multiple interferences.

[0048] Thus, the working principle of the print cabin 10 of the application for forming a laminar flow field is as follows:

[0049] The turbulent airflow entering the print cabin 10 from the inlet 100 is disturbed by the angle and size of the one or more interference portions 121 when passing through the one or more interference portions, and the flow direction and speed change, thereby preliminarily eliminating large-scale vortexes; then, when passing through the one or more interference portions 121, the airflow gradually tends to be uniform in flow rate gradient, so that the turbulent flow of inertial effect is weakened, and a stable viscous effect laminar flow field is formed; then, the position of the vent opening of the single interference portion or the spacing of the multiple interference portion array makes the laminar flow field flow at a predetermined height above the forming platform 11, so that the laminar flow field flows out of the print cabin 10 through the outlet 101.

[0050] In some embodiments of the application, the one or more interference portions 121 are installed in a predetermined structure between the inlet 100 and the forming platform 11, and the open space 122 at one end of the one or more interference portions 121 faces the inlet 100 of the print cabin 10, and the closed space 123 at the other end of the one or more interference portions 121 faces the forming platform 11.

[0051] In actual implementation, if a single interference portion is provided, an integrally formed interference portion is provided, and the single interference portion has a first interference end and a second interference end, and the first interference end and the second interference end are at a predetermined angle to form a predetermined structure. If multiple interference portions are provided and form a single layer of interference, a split-connection interference portion can be provided, and the first interference portion and the second interference portion are connected at a predetermined angle to form a predetermined structure. If multiple interference portions are provided and form multiple layers of interference, a split-connection interference portion can be provided and arranged in an array along the length direction of the print cabin 10, i.e., arranged in sequence from the inlet 100 to the forming platform 11, and the split-connection interference portion is at a predetermined angle to form a predetermined structure.

[0052] Reference Figure 8 is shown, Figure 8 A structural schematic diagram of an exemplary V-shaped structure interference portion of some embodiments of the application is shown. In some examples of the application, the one or more interference portions 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 structure interference portion 120-1 faces the inlet 100 of the print cabin 10, and the closed space 123 at the other end of the V-shaped structure interference portion 120-1 faces the forming platform 11.

[0053] In actual implementation, reference Figure 8 a is shown, Figure 8a shows a structural schematic diagram of an exemplary single V-shaped structure interference part 120-1 of the present application. If a single interference part is provided, an integrally formed V-shaped structure interference part 120-1 is provided, the V-shaped structure interference part 120-1 is divided into a first interference end 120-1a and a second interference end 120-1b, and a preset angle is formed between the first interference end 120-1a and the second interference end 120-1b to form a V-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11. For reference Figure 8 b shows that Figure 8 b shows a structural schematic diagram of an exemplary multiple single-layer V-shaped structure interference part 120-1 of the present application. If multiple interference parts are provided and form a single-layer interference, it can be referred to Figure 8 b(1) shows that a split connection interference part is provided, a preset angle is formed between the first interference part 1201 and the second interference part 1202 to form a V-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11; it can also be referred to Figure 8 b(2) shows that a vertical connection interference part is provided, the first interference part 1201 and the second interference part 1202 are connected to form a V-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11. For reference Figure 8 c shows that Figure 8 c shows a structural schematic diagram of an exemplary multiple multi-layer V-shaped structure interference part 1203 of the present application. If multiple interference parts are provided and form a multi-layer interference, a split connection interference part can be provided and the split connection multiple interference parts are arranged in an array along the length direction of the printing cabin 10, that is, arranged in sequence from the inlet 100 to the forming platform 11, and the split connection interference part is at a preset angle to form a V-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11.

[0054] For reference Figure 9 b shows that Figure 9 a structural schematic diagram of an exemplary W-shaped structure 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 structure interference part 120-2 faces the inlet 100 of the printing cabin 10, and the closed space 123 at the other end of the W-shaped structure interference part 120-2 faces the forming platform 11.

[0055] In actual implementation, it can be referred to Figure 9 a shows that Figure 9a shows a structural schematic diagram of an exemplary single W-shaped structure interference part 120-2 of the present application. If a single interference part is provided, an integrally formed W-shaped structure interference part 120-2 is provided, which is divided into a first interference end 120-2a, a second interference end 120-2b, and a third interference end 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 each at a preset angle to form a W-shaped structure with the first open space 1215 and the second open space 1216 facing the inlet 100, and the first closed space 1217 and the second closed space 1218 facing the forming platform 11.

[0056] 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 each at a preset angle to form a W-shaped structure with the first open space 1215 and the second open space 1216 facing the inlet 100, and the first closed space 1217 and the second closed space 1218 facing the forming platform 11. Figure 9 b shows, Figure 9 b shows a structural schematic diagram of an exemplary plurality of single-layer W-shaped structure interference parts 120-2 of the present application. If a plurality of interference parts are provided and form a single-layer interference, the interference parts can be provided separately and connected. The first interference part 1211 is connected at a preset angle to the second interference part 1212, the third interference part 1213, and the fourth interference part 1214, and connects the second interference part 1212 and the third interference part 1213 to form a W-shaped structure with the first open space 1215 and the second open space 1216 facing the inlet 100, and the first closed space 1217 and the second closed space 1218 facing the forming platform 11. Figure 9 c shows, Figure 9 c shows a structural schematic diagram of an exemplary plurality of multi-layer W-shaped structure interference parts 1219 of the present application. If a plurality of interference parts are provided and form a multi-layer interference, the interference parts can be provided separately and connected, and the plurality of interference parts are arranged in an array along the length direction of the printing cabin 10, i.e., arranged in order from the inlet 100 to the forming platform 11, and the interference parts are at a preset angle to form a W-shaped structure with the first open space 1215 and the second open space 1216 facing the inlet 100, and the first closed space 1217 and the second closed space 1218 facing the forming platform 11.

[0057] Reference Figure 10 is shown, Figure 10 shows a structural schematic diagram of an exemplary arc-shaped structure interference part of some embodiments of the present application. 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 structure interference part 120-3 faces the inlet 100 of the printing cabin 10, and the closed space 123 at the other end of the arc-shaped structure interference part 120-3 faces the forming platform 11.

[0058] In actual implementation, reference Figure 10 a shows, Figure 10a shows a structural schematic diagram of an exemplary single arc-shaped interference part 120-3 of the present application. If a single interference part is provided, an integrally formed arc-shaped interference part 120-3 is provided. The arc-shaped interference part 120-3 is divided into a first interference end 120-3a and a second interference end 120-3b. The first interference end 120-3a and the second interference end 120-3b form an arc with a predetermined radius therebetween to form an arc-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11. Reference is made to Figure 10 b shows, Figure 10 b shows a structural schematic diagram of an exemplary plurality of single-layer arc-shaped interference parts 120-3 of the present application. If a plurality of interference parts are provided and form a single-layer interference, the interference parts can be provided in a split connection. The first interference part 1231 and the second interference part 1232 are connected to form an arc with a predetermined radius therebetween to form an arc-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11. Reference is made to Figure 10 c shows, Figure 10 c shows a structural schematic diagram of an exemplary plurality of multi-layer arc-shaped interference parts 1233 of the present application. If a plurality of interference parts are provided and form a multi-layer interference, the interference parts can be provided in a split connection and arranged in an array along the length direction of the printing cabin 10, i.e., arranged in sequence from the inlet 100 to the forming platform 11. The interference parts are arranged to form an arc with a predetermined radius to form an arc-shaped structure with the open space 122 facing the inlet 100 and the closed space 123 facing the forming platform 11.

[0059] Thus, by analogy, one or more interference parts can also be provided in a wave-shaped structure, an irregular structure, etc. The specific structure is set by the operator according to actual needs and costs.

[0060] In some embodiments of the present application, the one or more interference parts 121 are installed between the inlet 100 and the forming platform 11 with a predetermined height.

[0061] Specifically, the height of the one or more interference parts 121 is set by the operator according to actual needs. The top end of the interference part 121 can be connected to the top end inside the printing cabin 10, the bottom end of the interference part 121 can be connected to the bottom end inside the printing cabin 10, or the interference part can be provided with a specific height.

[0062] In actual implementation, if a single interference portion is provided, the single interference portion can be connected to the top and bottom of the interior of the printing chamber 10, or the single interference portion can be set to a specific height size. If multiple interference portions are provided and a single layer of interference is formed, the separately connected interference portions can be connected to the top and bottom of the interior of the printing chamber 10, or the separately connected interference portions can be set to a specific height size. If multiple interference portions are provided and multiple layers of interference are formed, all the separately connected interference portions can be connected to the top and bottom of the interior of the printing chamber 10, or a part of the separately connected interference portions can be connected to the top and bottom of the interior of the printing chamber 10, and another part of the separately connected interference portions can be set to a specific height size. Alternatively, all the separately connected interference portions can be set to a specific height size. For reference, Figure 11 As shown, Figure 11 A schematic structural diagram showing an exemplary array of multiple interference parts of different heights according to some embodiments of the present application.

[0063] refer to Figure 12 As shown, Figure 12 A schematic diagram illustrating the structure of an exemplary angle adjustment assembly and an interference portion in some embodiments of the present application is shown. In some embodiments of the present application, the printing chamber 10 of the present application further includes one or more angle adjustment assemblies 124, which are connected to one or more interference portions 121 and are used to adjust the one or more interference portions 121 to a preset angle.

[0064] 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 rotational 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 snap or a threaded interface). At the same time, 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. 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.

[0065] In actual implementation, if a single interference part is set, the interference part is integrally formed, the single interference part has a first interference end and a second interference end, the first interference end and the second interference end are integrally formed at a preset angle, the driving end of the angle adjusting assembly 124 is connected with the single interference part, the single interference part is driven to rotate to a preset angle position by the angle adjusting assembly 124, so as to form a preset structure. If multiple interference parts are set and a single layer of interference is formed, the interference parts can be separately connected, the first interference part is connected with the first angle adjusting assembly, the second interference part is connected with the second angle adjusting assembly, the first interference part is driven to move by the first angle adjusting assembly and the second interference part is driven to move by the second angle adjusting assembly, so as to adjust the first interference part and the second interference part to a preset angle, so as to form a preset structure. If multiple interference parts are set and multiple layers of interference are formed, the interference parts can be separately connected and arranged in an array along the length direction of the printing cabin 10, that is, arranged in sequence from the inlet 100 to the forming platform 11, and the separately connected interference parts are connected with the angle adjusting assembly 124 respectively, the angles of the interference parts are adjusted in sequence by the angle adjusting assembly 124, so as to adjust the separately connected interference parts to a preset angle, so as to form a preset structure.

[0066] Reference Figure 13 As shown, Figure 13 An exemplary structure diagram of a protrusion part of an interference part is shown to illustrate some embodiments of the present application. In some embodiments of the present application, the printing cabin 10 of the present application further comprises one or more protrusion parts 125 arranged at a preset angle in the open space 122 of the one or more interference parts 121, and the one or more protrusion parts 125 are used to reduce the Reynolds coefficient of turbulent flow and improve the efficiency of turbulent flow transition to form laminar flow field.

[0067] Specifically, the protrusion part 125 can be set as a hemisphere, a cone or a prism (regular shape) or a randomly distributed spike structure (irregular shape), etc., to reduce the local turbulent area generated by turbulent flow, and the protrusion part 125 can be surface roughened according to actual needs, for example, a material with high friction coefficient is selected; the size, style and material of the specific protrusion part 125 are set by the operator according to actual needs and the protrusion part 125 is arranged at a preset angle in the open space of the interference part to guide the direction of airflow and reduce turbulent flow, and the arrangement form includes linear arrangement, matrix arrangement or spiral arrangement. The specific working principle is as follows: when the turbulent flow passes through the protrusion part 125, the surface of the protrusion part 125 guides the turbulent flow to change direction, and after the turbulent flow passes through the protrusion part 125, a secondary airflow is generated, which can disperse the fluid energy in the turbulent area, further reduce the Reynolds coefficient of turbulent flow, make it transition to laminar flow faster, and then ensure that the flow lines of the laminar flow are more uniform and maintain a stable flow rate and direction through the preset angle of the protrusion part 125.

[0068] In actual implementation, if a single protrusion 125 is provided, then Figure 13 As shown, a convex layer is coated or attached to one end of the open space of the interference part, and the convex layer is provided with a plurality of regular or irregular convexities for increasing friction resistance; if multiple convex portions 125 are provided, then refer to Figure 14 As shown, Figure 14 This is a structural schematic 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 friction resistance, and then a multi-point resistance network is formed through the rough layer; the preset direction can be set in the direction of turbulent airflow to form a continuous resistance to turbulence.

[0069] Therefore, reference Figure 2 In some embodiments of the present application, the present application also relates to an additive manufacturing device having the printing chamber 10, further comprising:

[0070] 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 .

[0071] 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 circular 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 circular type, a square type, etc., to slow down the airflow speed and prevent laminar turbulence, thereby controlling the uniform discharge of the laminar flow field. The above is only an embodiment of the present application. It should be pointed out that for ordinary technicians in this field, improvements can be made without departing from the inventive concept of the present application, but these all fall within the scope of protection of the present application.

[0072] Reference numerals: 10, printing cabin, 11, forming platform, 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, protrusion, 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, 120-2b, second interference end, 120-1c, third interference end, 1211, first interference part, 1212, second interference part, 1213, third interference part, 1214, fourth interference part, 1215, first open space, 1216, second open space, 1217, first closed space, 1218, second closed space, 1219, multi-layer W-shaped structure interference part, 120-3, arc-shaped structure interference part, 120-3a, first interference end, 120-3b, second interference end, 1231, first interference part, 1232, second interference part, 1233, multi-layer arc-shaped structure interference part, 1240, first height interference part, 1241, second height interference part, 1242, third height interference part, 1251, protrusion layer.

Claims

1. A printing chamber (10) for forming a laminar wind field, characterized in that: The printing chamber (10) comprises: Import(100); Exit (101); a forming platform (11) installed between the inlet (100) and the outlet (101); One or more interference parts (120) are arranged in a preset structure between the inlet (100) and the forming platform (11), and are used to reverse the turbulent flow introduced by the inlet (100) above the forming platform (11) to form a laminar flow field of specific size and flow rate and guide the laminar flow field to flow along a preset height above the forming platform (11) to the outlet (101).

2. The printing chamber (10) according to claim 1, characterized in that The one or more interference parts (120) are installed in a preset structure between the inlet (100) and the forming platform (11).

3. The printing chamber (10) according to claim 2, characterized in that The one or more interference parts (120) are installed in a V-shaped structure between the inlet (100) and the forming platform (11).

4. The printing chamber (10) according to claim 3, characterized in that The cross section of one or more interference parts (120) of the V-shaped structure is at a preset angle.

5. The printing chamber (10) according to claim 2, characterized in that The one or more interference parts (120) are partially or completely arc-shaped structures and are installed between the inlet (100) and the forming platform (11).

6. The printing chamber (10) according to claim 2, characterized in that The one or more interference parts (120) are installed in a W-shaped structure between the inlet (100) and the forming platform (11).

7. The printing chamber (10) according to any one of claims 1 to 6, characterized in that: The open space (122) of the one or more interference parts (120) is close to the inlet (100), and the closed space (123) of the one or more interference parts (120) is close to the forming platform (11).

8. The printing chamber (10) according to claim 1, characterized in that The one or more interference parts (120) are installed between the inlet (100) and the forming platform (11) with a preset height dimension.

9. The printing chamber (10) 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 (120), and the angle adjustment component (124) is used to adjust the one or more interference parts (120) to a preset angle.

10. The printing chamber (10) according to claim 9, characterized in that The angle adjustment assembly (124) is installed between the inlet (100) and the forming platform (11) and adjusts the one or more interference parts (120) to a preset angle to form a preset structure, wherein 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 printing chamber (10) 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 (120), and are used to reduce the Reynolds coefficient of turbulence and improve the efficiency of turbulence reversal to form a laminar flow field.

12. The printing chamber (10) 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 (120) and are combined to form a rough layer that increases friction resistance.

13. An additive manufacturing device comprising a printing chamber (10) according to any one of claims 1 to 12.

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