Additive manufacturing blank of honeycomb component and additive manufacturing method

Abstract

The present invention discloses an additive manufacturing blank and an additive manufacturing method for a honeycomb component, which belongs to the field of additive manufacturing technology and is used to solve the problem in the prior art that the morphology of the internal structure of the honeycomb component formed by additive manufacturing is difficult to change again after forming, and the forming size is limited by equipment. The blank includes a blank body and a clamping part. The blank body is provided with a preset vacancy, and the shape of the preset vacancy is a hexagon. The shape of the hole on the honeycomb component is a regular hexagon; along the drawing direction, the width of the preset vacancy is smaller than the width of the hole on the honeycomb component; along the direction perpendicular to the drawing direction, the width of the preset vacancy is larger than the width of the hole on the honeycomb component. The method includes obtaining a blank by additive manufacturing; in two adjacent layers, the scanning strategy of the next layer is the same as the scanning strategy of the previous layer; and the blank is drawn and formed. The present invention can be used for additive manufacturing of honeycomb components.

Description

Technical Field

[0001] The present invention belongs to the technical field of additive manufacturing, and in particular relates to an additive manufacturing blank of a honeycomb component and an additive manufacturing method. Background Art

[0002] Additive manufacturing technology, also known as "3D printing technology", is a manufacturing technology that uses layer-by-layer stacking to achieve the forming of complex structures. This technology can achieve "net-near forming" of parts and can overcome the limitations of traditional processing methods on structural shapes.

[0003] When using existing additive manufacturing technology to form honeycomb components, structural design is usually carried out in the model design stage. After forming, the morphology of the internal structure is difficult to change again, and the size of the formed parts is limited by the size limit of the forming equipment. Parts that exceed the maximum forming size of the equipment cannot be formed. Larger parts can only be manufactured by equipment with larger forming sizes, which increases the equipment investment cost. Summary of the invention

[0004] In view of the above analysis, the present invention aims to provide an additive manufacturing blank and an additive manufacturing method for a honeycomb component, so as to solve the problem in the prior art that the morphology of the internal structure of the honeycomb component formed by additive manufacturing is difficult to change again after forming and the forming size is limited by the equipment.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] The present invention provides an additive manufacturing blank of a honeycomb component, comprising a blank body and clamping parts arranged at both ends of the blank body along a drawing direction, the blank body is provided with a preset vacancy, the preset vacancy is in a hexagonal shape, and the shape of the holes on the honeycomb component is a regular hexagon;

[0007] Along the drawing direction, the width of the preset vacancy is smaller than the width of the holes on the honeycomb structure;

[0008] In a direction perpendicular to the drawing direction, the width of the preset vacancy is greater than the width of the holes on the honeycomb structure.

[0009] Furthermore, a plurality of connection holes are provided on the clamping portion.

[0010] Furthermore, in a direction perpendicular to the drawing direction, two ends of the clamping portion protrude from the blank body to form a boss.

[0011] Furthermore, the strength of the clamping portion is greater than the strength of the blank body.

[0012] Furthermore, the material of the clamping part is titanium alloy or stainless steel, and the material of the blank body is aluminum alloy.

[0013] Furthermore, a reinforcement piece is provided on one side of the clamping portion facing the blank body, and the reinforcement piece is integrally formed with the clamping portion.

[0014] Furthermore, the reinforcement member includes a first reinforcement segment, a second reinforcement segment, a third reinforcement segment and a fourth reinforcement segment which are connected in sequence, and the first reinforcement segment is integrally formed with the clamping portion.

[0015] Further, the first reinforcement section and the third reinforcement section are both perpendicular to the clamping portion, and the length of the first reinforcement section is greater than the length of the third reinforcement section;

[0016] The second reinforcement section and the fourth reinforcement section are both parallel to the clamping portion, and the length of the second reinforcement section is greater than the length of the fourth reinforcement section;

[0017] The material of the blank body is filled between the first reinforcement segment, the second reinforcement segment, the third reinforcement segment and the fourth reinforcement segment.

[0018] Furthermore, the blank further comprises a deformation auxiliary rod, one end of which is fixedly connected to a boss formed by one of the clamping parts, and the other end of which is fixedly connected to a boss formed by another clamping part;

[0019] The diameter of the deformation auxiliary rod gradually increases in a direction gradually away from the transverse center line of the blank body.

[0020] The present invention also provides a method for additive manufacturing of a honeycomb component, comprising the following steps:

[0021] Step 1: Design the blank model;

[0022] Step 2: using additive manufacturing to obtain a blank having the same shape and structure as the blank model, wherein the blank is an additive manufacturing blank of the honeycomb component;

[0023] In two adjacent layers, the scanning strategy of the next layer is the same as the scanning strategy of the previous layer;

[0024] Step 3: The blank is drawn into shape. During the drawing process, the width of the preset vacancies increases along the drawing direction, and the width of the preset vacancies decreases perpendicular to the drawing direction, so that the preset vacancies are deformed into holes of the honeycomb component, thereby completing the additive manufacturing of the honeycomb component.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0026] A) The additive manufacturing blank of the honeycomb component provided by the present invention can realize the forming of honeycomb components of various shapes, sizes, structures and spatial positions by printing preset vacancies, which can improve the utilization rate of materials and additive manufacturing equipment, realize green manufacturing, and meet the needs of lightweight complex structure forming. On the other hand, it can improve the design of the preset vacancies and realize the forming of components with more complex structures. On the other hand, since the honeycomb component can be formed by drawing before being formed, it can break away from the size limitation of the additive manufacturing equipment and realize the forming of components with larger sizes.

[0027] B) The additive manufacturing blank of the honeycomb component provided by the present invention can reduce the deformation of the clamping part during the drawing process by appropriately increasing the strength of the clamping part, so that the deformation is mainly concentrated on the blank body.

[0028] C) The additively manufactured blank of the honeycomb component provided by the present invention has a reinforcing member and a clamping portion that are integrally formed, and the two are made of the same material and have a strength higher than that of the blank body. By providing the reinforcing member, the strength of the connection interface between the clamping portion and the blank body can be effectively improved, and the separation of the clamping portion and the blank body during the stretching process can be basically avoided.

[0029] D) The additive manufacturing blank of the honeycomb component provided by the present invention, through the setting of the deformation auxiliary rod, is equivalent to reducing the cross-sectional size at the center position of the blank body and increasing the cross-sectional size at the two end positions of the blank body, which can be more conducive to the deformation of the center of the blank and further improve the deformation uniformity of the blank body.

[0030] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0032] Figure 1 A schematic structural diagram of an additively manufactured blank of a honeycomb component provided in Embodiment 1 of the present invention;

[0033] Figure 2 Another structural schematic diagram of an additively manufactured blank of a honeycomb component provided in the first embodiment of the present invention;

[0034] Figure 3A schematic structural diagram of a final energy component obtained by the additive manufacturing method of a honeycomb component provided in the second embodiment of the present invention.

[0035] Reference numerals:

[0036] 1-blank body; 2-clamping part; 3-connecting hole; 4-preset vacancy; 5-honeycomb component; 6-hole; 7-first reinforcement section; 8-second reinforcement section; 9-third reinforcement section; 10-fourth reinforcement section; 11-deformation auxiliary rod. DETAILED DESCRIPTION

[0037] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0038] In the existing additive manufacturing process, in order to reduce the anisotropy of components and ensure the uniformity of the overall performance of components, usually in the process of additive manufacturing of two adjacent layers, the laser angle deflection method is adopted between the laser scanning strategy of the lower layer and the laser scanning strategy of the upper layer to reduce the anisotropy.

[0039] Embodiment 1

[0040] This embodiment provides an additive manufacturing blank of a honeycomb component, see Figure 1 to Figure 2 , which comprises a blank body 1 and a clamping part 2 arranged at both ends of the blank body 1 along the drawing direction, and a preset vacancy 4 is arranged on the blank body 1. The preset vacancy 4 is in the shape of a hexagon, and the shape of the hole 6 on the honeycomb component 5 is a regular hexagon. Along the drawing direction, the width of the preset vacancy 4 is smaller than the width of the hole 6 on the honeycomb component 5; along the direction perpendicular to the drawing direction, the width of the preset vacancy 4 is larger than the width of the hole 6 on the honeycomb component 5.

[0041] Compared with the prior art, the additive manufacturing blank of the honeycomb component provided in this embodiment can realize the forming of honeycomb components of various shapes, sizes, structures and spatial positions by printing preset vacancies 4, which can improve the utilization rate of materials and additive manufacturing equipment, realize green manufacturing, and meet the needs of lightweight complex structure forming. On the other hand, it can improve the design of the preset vacancies 4 and realize the forming of components with more complex structures. On the other hand, since the honeycomb component 5 can be formed by drawing before being formed, it can break away from the size limitation of the additive manufacturing equipment and realize the forming of components of larger sizes.

[0042] In practical applications, the size and shape of the holes 6 of the honeycomb structure 5 may be different, and accordingly, the size and shape of the preset spaces 4 may also be different.

[0043] Regarding the structure of the clamping portion 2, specifically, the following two methods can be used:

[0044] In one method, a plurality of connection holes 3 are provided on the clamping portion 2. Figure 2 , the connecting rod of the stretching machine is inserted into the connecting hole 3, thereby realizing the connection between the stretching machine and the clamping part 2.

[0045] In another way, the two ends of the clamping part 2 protrude from the blank body 1 perpendicular to the drawing direction to form a boss, see Figure 1 .

[0046] During the drawing process, since the clamping part 2 is directly connected to the stretching machine, it will be deformed first, and this partial deformation is not conducive to the deformation of the blank body 1. Therefore, the strength (tensile strength) of the clamping part 2 is greater than the strength of the blank body 1. In this way, by appropriately increasing the strength of the clamping part 2, the deformation of the clamping part 2 can be reduced during the drawing process, so that the deformation is mainly concentrated on the blank body 1.

[0047] Specifically, the difference in strength between the clamping part 2 and the blank body 1 can be achieved by selecting different materials. For example, the material of the clamping part is titanium alloy or stainless steel, and the material of the component body is aluminum alloy. Accordingly, for laser selective melting deposition, the powder laid by the clamping part is titanium alloy powder or stainless steel powder, and the powder laid by the blank body 1 is aluminum alloy powder.

[0048] It is worth noting that since different materials are selected to form the clamping portion 2 and the blank body 1, the strength of the connection interface between the clamping portion 2 and the blank body 1 will inevitably decrease. In order to prevent the clamping portion 2 from separating from the blank body 1 during the stretching process, a reinforcement piece is provided on the side of the clamping portion 2 facing the blank body 1, see Figure 1 , the reinforcement is integrally formed with the clamping portion 2. Specifically, the reinforcement includes a first reinforcement segment 7, a second reinforcement segment 8, a third reinforcement segment 9 and a fourth reinforcement segment 10 connected in sequence. The first reinforcement segment 7 is integrally formed with the clamping portion 2. The first reinforcement segment 7 and the third reinforcement segment 9 are both perpendicular to the clamping portion 2, and the length of the first reinforcement segment 7 is greater than the length of the third reinforcement segment 9. The second reinforcement segment 8 and the fourth reinforcement segment 10 are both parallel to the clamping portion 2, and the length of the second reinforcement segment 8 is greater than the length of the fourth reinforcement segment 10, so that a spiral reinforcement can be formed. The material of the blank body 1 is filled in the first reinforcement segment 7, the second reinforcement segment 8, the third reinforcement segment 9 and the fourth reinforcement segment 10. In this way, since the reinforcement is integrally formed with the clamping portion 2, the materials of the two are the same, and the strength is higher than the strength of the blank body 1. By setting the reinforcement, the strength of the connection interface between the clamping portion 2 and the blank body 1 can be effectively improved, and the separation of the clamping portion 2 and the blank body 1 during the stretching process can be basically avoided.

[0049] In order to further improve the deformation uniformity of the blank body 1, the blank further includes a deformation auxiliary rod 11, see Figure 1 One end of the deformation auxiliary rod 11 is fixedly connected to the boss formed by one of the clamping parts 2, and the other end of the deformation auxiliary rod 11 is fixedly connected to the boss formed by the other clamping part 2. The center line of the blank body 1 perpendicular to the drawing direction is defined as the transverse center line. Along the direction gradually away from the transverse center line of the blank body 1, the diameter of the deformation auxiliary rod 11 gradually increases. That is to say, the diameter of the deformation auxiliary rod 11 is smaller at the position close to the transverse center line of the blank body 1, and the diameter of the deformation auxiliary rod 11 is larger at the position away from the transverse center line of the blank body 1. Through the setting of the deformation auxiliary rod 11, it is equivalent to reducing the cross-sectional size of the center position of the blank body 1 and increasing the cross-sectional size at both ends of the blank body 1, which can be more conducive to the deformation of the center of the blank and further improve the deformation uniformity of the blank body 1.

[0050] Embodiment 2

[0051] This embodiment provides an additive manufacturing method for a honeycomb component, comprising the following steps:

[0052] Step 1: Use 3D drawing software such as SolidWorks and UG to design the blank model;

[0053] Step 2: using additive manufacturing to obtain a blank having the same shape and structure as the blank model, wherein the blank is an additive manufacturing blank of the honeycomb component provided in Example 1;

[0054] During the additive manufacturing process, auxiliary support structures should be added to stress concentration areas and overhanging areas to ensure the forming accuracy of components;

[0055] In two adjacent layers, the scanning strategy of the next layer is the same as the scanning strategy of the previous layer. For example, laser selective melting is used to manufacture the blank. The scanning strategy mainly refers to the laser angle, forming power, scanning speed and layer thickness. In two adjacent layers, the laser angle of the next layer is the same as the laser angle of the previous layer, the forming power of the next layer is the same as the forming power of the previous layer, the scanning speed of the next layer is the same as the scanning speed of the previous layer, and the layer thickness of the next layer is the same as the layer thickness of the previous layer;

[0056] Step 3: Place the blank in a stretching machine or a hot forming device to draw the blank into shape. During the drawing process, the width of the preset vacancy 4 increases along the drawing direction, and the width of the preset vacancy 4 decreases perpendicular to the drawing direction, so that the preset vacancy 4 is deformed into a hole 6 of the honeycomb component 5, completing the additive manufacturing of the honeycomb component, see Figure 3 .

[0057] It should be noted that before the blank is formed, the size, shape and position of the pre-set vacancy 4 are designed according to the forming requirements of the honeycomb member 5; before additive manufacturing, reasonable process parameters are selected according to the drawing forming direction to make the forming material in this direction have a certain plasticity; before drawing forming, reasonable parameter designs such as temperature, time and tensile force are carried out according to the material characteristics, the size of the pre-set vacancy 4 and the structural form, etc. However, the parameters required for components with different structures are different and will not be elaborated one by one here.

[0058] Compared with the prior art, the additive manufacturing method of the honeycomb member provided in this embodiment has the characteristics of high automation, easy operation, simple operation steps, easy implementation, etc. Based on the technical principle of drawing forming based on the pre-set vacancy 4, an integrated printing of the pre-set vacancy 4 and the overall structure of the blank is formed by a layer-by-layer stacking method. Then, by utilizing the anisotropy of the material properties caused by the unique solidification characteristics of additive manufacturing and through a specific scanning strategy, this anisotropy is appropriately retained and enlarged, and the overall blank is drawn to form the honeycomb member 5. On the one hand, it can improve the utilization rate of materials and additive manufacturing equipment, realize green manufacturing, and meet the forming requirements of lightweight complex structures. On the other hand, it can improve the designability of the pre-set vacancy 4 and realize the forming of components with more complex structures. On the other hand, since it can be drawn before the honeycomb member 5 is formed, it can break away from the size limitation of the additive manufacturing equipment and can realize the forming of larger-sized components.

[0059] It should be noted that the material of the above-mentioned honeycomb member 5 can be aluminum alloy, titanium alloy, superalloy, etc.

[0060] During the drawing forming process, the drawing temperature needs to be considered according to the material and plasticity of the component and the drawing deformation rate. Exemplarily, when the drawing deformation rate is 10% or less, the blank does not need to be heated and can be directly drawn; when the drawing deformation rate exceeds 10%, the blank needs to be drawn in a high-temperature environment, and the temperature selection range is generally 0.4 - 0.95Tm (Tm, the melting point of the alloy material). The high-temperature drawing forming environment can be realized by heating with a thermal resistance wire, etc.

[0061] Among them, the drawing temperature of the aluminum alloy blank is above 200°C, for example, 200 - 350°C; the drawing temperature of the titanium alloy blank is above 600°C, for example, 600 - 900°C; the drawing temperature of the superalloy blank is above 600°C, for example, 600 - 900°C.

[0062] In order to facilitate the performance requirements in the subsequent drawing direction and ensure the density and anisotropy of the internal structure of the blank, for example, the forming power of the titanium alloy blank is 100-300W, the scanning speed is 300-1000mm / s, the layer thickness is 60-100μm, and the same laser scanning strategy is used between adjacent layers, thereby ensuring the continuous growth of columnar crystals and other structures in the drawing direction, so that the material in the subsequent drawing direction has better elongation.

[0063] Considering that the pre-set vacancy 4 needs to be drawn to obtain the holes 6 of the honeycomb structure 5, in order to prevent the pre-set vacancy 4 from cracking during the drawing process, a circular chamfer is set at the corner of the pre-set vacancy 4, and the radius of the circular chamfer is 0.1 to 20 mm. In this way, the stress concentration at the corner can be reduced by setting the circular chamfer, thereby preventing the occurrence of tip cracking.

[0064] Exemplarily, in the above step 2, the additive manufacturing method is one of laser selective melting deposition, electron beam selective melting, laser melting deposition, electron beam fuse deposition, arc fuse deposition, and laser fuse deposition.

[0065] Specifically, laser selective melting deposition includes the following steps in sequence: model preparation, powder raw material and substrate preparation, equipment preparation, printing, picking up, stress relief annealing, wire cutting, support removal and grinding and polishing.

[0066] The annealing temperature of stress relief annealing is 200-1100°C, the holding time is 0.5-20h, and the cooling method is furnace cooling or air cooling.

[0067] During the stress relief annealing process, the heating and cooling rates in the drawing direction are lower than those perpendicular to the drawing direction, and the difference in heating rate is 10-15°C / min. Similarly, the cooling rate in the drawing direction is lower than that perpendicular to the drawing direction, and the difference in cooling rate is 10-15°C / min. This is because differential heating and cooling can further expand the anisotropy of the blank, thereby promoting plastic deformation in the drawing direction.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. An additive manufacturing blank for a honeycomb component, It is characterized in that It comprises a blank body and clamping parts arranged at both ends of the blank body along the drawing direction, the blank body is provided with preset vacancies, the shape of the preset vacancies is hexagonal, and the shape of the holes on the honeycomb component is a regular hexagon; Along the drawing direction, the width of the preset vacancy is smaller than the width of the holes on the honeycomb structure; In a direction perpendicular to the drawing direction, the width of the preset vacancy is greater than the width of the holes on the honeycomb structure; In a direction perpendicular to the drawing direction, two ends of the clamping portion protrude from the blank body to form a boss; The strength of the clamping portion is greater than the strength of the blank body; The material of the clamping part is titanium alloy or stainless steel, and the material of the blank body is aluminum alloy; A reinforcing piece is provided on one side of the clamping portion facing the blank body, and the reinforcing piece is integrally formed with the clamping portion.

2. The additively manufactured blank of the honeycomb component according to claim 1, It is characterized in that A plurality of connection holes are provided on the clamping portion.

3. The additively manufactured blank of the honeycomb component according to claim 1, It is characterized in that The reinforcement member comprises a first reinforcement segment, a second reinforcement segment, a third reinforcement segment and a fourth reinforcement segment which are connected in sequence, and the first reinforcement segment is integrally formed with the clamping portion.

4. The additively manufactured blank of the honeycomb component according to claim 3, It is characterized in that The first reinforcement section and the third reinforcement section are both perpendicular to the clamping portion, and the length of the first reinforcement section is greater than the length of the third reinforcement section; The second reinforcement section and the fourth reinforcement section are both parallel to the clamping portion, and the length of the second reinforcement section is greater than the length of the fourth reinforcement section; The material of the blank body is filled between the first reinforcement segment, the second reinforcement segment, the third reinforcement segment and the fourth reinforcement segment.

5. The additively manufactured blank of the honeycomb component according to claim 1, It is characterized in that The blank further includes a deformation auxiliary rod, one end of which is fixedly connected to a boss formed by one of the clamping parts, and the other end of which is fixedly connected to a boss formed by the other clamping part; The diameter of the deformation auxiliary rod gradually increases along the direction gradually away from the transverse center line of the blank body.

6. A method for additive manufacturing of a honeycomb component, It is characterized in that The steps include: Step 1: Design the blank model; Step 2: using additive manufacturing to obtain a blank having the same shape and structure as the blank model, wherein the blank is an additively manufactured blank of the honeycomb component according to any one of claims 1 to 5; In two adjacent layers, the scanning strategy of the next layer is the same as the scanning strategy of the previous layer; Step 3: The blank is drawn into shape. During the drawing process, the width of the preset vacancies increases along the drawing direction, and the width of the preset vacancies decreases perpendicular to the drawing direction, so that the preset vacancies are deformed into holes of the honeycomb component, thereby completing the additive manufacturing of the honeycomb component.

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