Method for removing support of laser additive manufacturing topological optimization support part, application of method and support removing auxiliary device

Abstract

The invention relates to the field of additive manufacturing, in particular to a method for removing a support of a laser additive manufacturing topological optimization support part, application of the method and an auxiliary device for removing the support. According to the removing method provided by the invention, the shape follow-up ceramic fixing structure is manufactured, and the high hardness and stability of the ceramic material are utilized, so that stable support is provided for the part, and the part is effectively prevented from deforming when the support is removed. And meanwhile, a conformal copper alloy cooling flow channel is manufactured, heat generated in the mechanical action can be taken away in time, the support is effectively cooled, and therefore the situation that the part generates thermal stress due to temperature rising is avoided, and deformation of the part is further prevented. According to the innovative support removing method, the supporting effect of the ceramic and the cooling function of the copper alloy cooling flow channel are combined, protection on the part in the support removing process is achieved, the size precision and quality stability of the part are improved, the production cost is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of additive manufacturing, in particular to a support removal method for laser additive manufacturing of a topologically optimized support part and application and support removal auxiliary device thereof. BACKGROUND

[0002] In the modern engineering field, the performance and lightweight design of structural parts are crucial. After topological optimization, the support can achieve the predetermined load-bearing and functional requirements with minimal material usage. The structure is highly complex and delicate, and the material distribution is accurately laid out according to the stress condition. Not only does it significantly reduce its own weight, but it also greatly improves the structural strength and stiffness, and has a broad application prospect in the field of aerospace.

[0003] Traditional manufacturing processes such as cutting and casting are often limited when faced with the complex and variable internal structure of topologically optimized supports due to high processing difficulty, high mold cost or inability to implement. Laser additive manufacturing technology can build complex-shaped supports according to digital models without the need for molds, and can accurately construct topologically optimized designs, making it very suitable for manufacturing topologically optimized supports.

[0004] However, in the process of laser additive manufacturing, support structures are usually added to prevent deformation, collapse and auxiliary material accumulation during the manufacturing process. These support structures must be removed after manufacturing, but the complex internal structure and irregular shape of the topologically optimized support can cause local temperature rise and thermal stress in the part during support removal. Therefore, topologically optimized supports are prone to deformation during support removal, which seriously affects the production efficiency and yield of laser additive manufacturing of topologically optimized supports, and becomes a key bottleneck problem restricting the development of this field. Therefore, it is urgent to invent a laser additive manufacturing and support removal method for topologically optimized supports to fully utilize the advantages of laser additive manufacturing of topologically optimized supports and promote the high-quality development of related industries. SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a support removal method for laser additive manufacturing of a topologically optimized support part and application and support removal auxiliary device thereof. The removal method provided by the present application can inhibit or avoid the problem of easy deformation and cracking of the part caused by the laser additive manufacturing support of the thin-walled ring-shaped part during the removal process, and the size precision of the part after removing the support is high.

[0006] The present application provides a support removal method for laser additive manufacturing of a topologically optimized support part, comprising the following steps:

[0007] S1) providing a support removal auxiliary device, which comprises a fixing device body (4) and a water cooling device body (2); the fixing device body (4) comprises opposite first and second surfaces; the water cooling device body (2) comprises opposite third and fourth surfaces;

[0008] The first surface of the fixing device body (4) is provided with a groove (401) and a support limiting groove (402); the water cooling device body (2) is placed in the fixing device body (4) through the groove (401), so that the third surface of the water cooling device body (2) is flush with the first surface of the fixing device body (4); the support limiting groove (402) can constrain the support to be removed of the laser additive manufacturing topologically optimized support part;

[0009] The third surface of the water cooling device body (2) is provided with a support body groove (201) matched with the support body of the laser additive manufacturing topologically optimized support part, so that the groove wall of the support body groove can be in contact with the support body; the inside of the water cooling device body (2) is provided with a cooling liquid channel (202);

[0010] S2) constraining the support to be removed of the laser additive manufacturing topologically optimized support part in the support limiting groove (402) of the support removal auxiliary device, so that the support body of the laser additive manufacturing topologically optimized support part is in contact with the groove wall of the support body groove (201) at the same time, and the support to be removed is mechanically removed while the cooling liquid is fed into the cooling liquid channel (202) of the support removal auxiliary device.

[0011] The support removal method of the laser additive manufacturing topologically optimized support part provided by the application firstly provides a support removal auxiliary device. The support removal auxiliary device comprises a fixing device body (4) and a water cooling device body (2); the fixing device body (4) comprises opposite first and second surfaces; the water cooling device body (2) comprises opposite third and fourth surfaces.

[0012] The fixing device body (4) provided by the application can support the support body of the laser additive manufacturing topologically optimized support part. During the support removal process, an external force needs to be applied to the support body, and the fixing device body (4) can prevent the support body from deforming when the support is removed. The material of the fixing device body (4) is ceramic. Ceramic has excellent strength, hardness and wear resistance, and is low in price. Not only can it meet the use requirements, but also the cost is low, which is conducive to the wide application of the application.

[0013] The wall thickness of the fixing device body (4) is 10-30 mm; when the wall thickness is less than 10 mm, the wall thickness is too thin to cause insufficient strength of the fixing device, and damage may occur under external force when the support is removed; when the wall thickness is greater than 30 mm, more materials are used, but the effect of resisting external force is not obviously contributed. Considering the above factors, the size and weight are reduced as much as possible under the premise of ensuring that the fixing effect can be fully played, the processing materials and time are saved, and the manufacturing cost of the device is reduced.

[0014] The first surface of the fixing device body (4) has a groove (401) and a support limiting groove (402); specifically, the first surface of the fixing device body (4) has a groove (401), and the area of the first surface outside the groove (401) has a support limiting groove (402); more specifically, the first surface of the fixing device body (4) has a groove (401), and the non-groove area of the first surface naturally forms a reverse boss, and the top surface of the reverse boss has a support limiting groove (402).

[0015] The groove (401) can accommodate the water cooling device body (2). Specifically, the water cooling device body (2) is placed in the fixing device body (4) through the groove (401), so that the third surface of the water cooling device body (2) is flush with the first surface of the fixing device body (4). More specifically, the water cooling device body (2) is clearance fit in the fixing device body (4) through the groove (401). More specifically, the contact surface of the water cooling device body (2) and the groove (401) of the fixing device body (4) is designed as a whole, so that the water cooling device body (2) can be clearance fit in the fixing device body (4) through the groove (401). More specifically, the water cooling device body (2) is placed in the groove (401) of the fixing device body (4), and the fourth surface of the water cooling device body (2) is fixed on the groove surface of the groove (401) of the fixing device body (4) by bonding, so that the water cooling device body (2) and the fixing device body (4) form a combination. The bonding operation is simple and the bonding strength can meet the use requirement, and the two will not fall off and separate during the support removal process.

[0016] Preferably, the size of the groove (401) of the fixing device body (4) is 1-2 mm larger than the size of the water cooling device body (2), specifically, after the water cooling device body (2) is placed in the groove (401) of the fixing device body (4), the edge of the water cooling device body (2) has a gap of 1-2 mm with the groove wall of the groove (401), so as to ensure that the water cooling device body (2) can be smoothly placed in the groove (401) and has a certain activity space, if the size difference is less than 1 mm, when the water cooling device body (2) is placed on the groove (401), due to the narrow space, it is difficult to further bond the water cooling device body (2) and the fixing device body (4) into a combination; if the size difference is greater than 2 mm, the activity range of the water cooling device body (2) in the groove (401) is too large, which leads to greater difficulty in positioning the water cooling device body (2) and the fixing device body (4) when they are further bonded into a combination, and it is difficult to ensure the position accuracy of the two.

[0017] The support limiting groove (402) can constrain the support to be removed of the laser additive manufacturing topology optimized support part. Specifically, the profile of the support limiting groove (402) is the same as the outer shape of the support to be removed, so that the support to be removed can cooperate with the support limiting groove (402), and the support to be removed is limited by the support limiting groove (402), preventing the part from shaking during support removal, thereby reducing the difficulty of support removal. Preferably, the size of the support limiting groove (402) is 1-2 mm larger than the size of the support to be removed, specifically, the width of the support limiting groove (402) is 1-2 mm larger than the outer diameter of the widest part of the support to be removed, so that after the support to be removed cooperates with the support limiting groove (402), the support to be removed has a one-sided activity gap of 0.5-1 mm. If the size difference is less than 1 mm, when the support to be removed is installed on the support limiting groove (402), due to the narrow space, it is difficult to position and operate; if the size difference is greater than 2 mm, the activity range of the support to be removed on the support limiting groove (402) is too large, and the limiting effect of the support limiting groove (402) is difficult to fully play. Preferably, the depth of the support limiting groove (402) is 1 / 2-2 / 3 of the support to be removed. If the depth is less than 1 / 2, the support to be removed cannot obtain sufficient support force, and the limiting effect of the support limiting groove (402) is not fully played; if the depth is greater than 2 / 3, the embedding depth of the support to be removed is too large, which leads to great difficulty in installation and removal.

[0018] The groove surface of the support limiting groove (402) is further provided with a rubber gasket (9); preferably, the rubber gasket (9) is fixed on the groove surface of the support limiting groove (402) by adhesion. The rubber gasket (9) can reduce hard contact, provide cushioning effect, prevent damage to the support body when the support is removed, and enhance the stability of the fixing device body (4). The shape of the rubber gasket (9) is the same as the contour of the support limiting groove (402); the size of the rubber gasket (9) is 1mm-2mm smaller than the size of the support limiting groove (402), so as to ensure that the rubber gasket (9) can be smoothly put in and have a certain activity space. If the size difference is less than 1mm, the rubber gasket (9) will be difficult to install on the support limiting groove (402) due to the small space; if the size difference is greater than 2mm, the activity range of the rubber gasket (9) on the support limiting groove (402) is too large, which makes the positioning of the two difficult during adhesion, and it is difficult to ensure the position accuracy of the two.

[0019] The fixing device body (4) is further provided with a plurality of semi-closed structure cavities (7) which are open at one end and closed at the other end. Preferably, the shape of the semi-closed structure cavity (7) is a regular hexagon, and a plurality of semi-closed structure cavities (7) jointly form a honeycomb structure inside the fixing device body (4). The honeycomb structure is designed because the compression resistance effect of this structure is better, thereby enhancing the impact resistance and bending strength of the fixing device body (4).

[0020] More preferably, the semi-closed structure cavity (7) is further filled with cured resin. The cured resin of the application is preferably selected from liquid epoxy resin; the liquid epoxy resin can be poured into the semi-closed structure cavity (7), and the flowability of the liquid epoxy resin can fully fill the semi-closed structure cavity (7), and after curing, the semi-closed structure cavity (7) is filled with cured resin; and the epoxy resin is cheap and easy to purchase, which is conducive to the wide application of the application; the semi-closed structure of the semi-closed structure cavity (7) ensures that the cured resin poured in will not spill out. The semi-closed structure cavity (7) filled with cured resin forms a heterogeneous structure in the fixing device body (4), which can further improve the overall strength and stability of the fixing device body (4), and play a better fixing role when the support is removed.

[0021] The fixing device body (4) is further provided with a bolt hole (8); specifically, the fixing device body (4) is further provided with four bolt holes (8). The bolt hole (8) is used to fix the fixing device body (4) to the surface of the workbench (11) by bolts (10), so as to prevent displacement during support removal and reduce operation difficulty.

[0022] The water cooling device body (2) of the application is used for cooling the support body of the part during support removal, and has the same shape as the support body of the laser additive manufacturing topological optimization support part. Specifically, during support removal, the interaction between the removal tool and the support of the part can cause the local temperature of the support body of the part to rise, heat stress is formed inside the support body of the part, and the support body of the part is deformed. By arranging the water cooling device body (2), the cooling water can fully flow through the surface of the support body of the part, the temperature of the support body of the part during support removal can be reduced, the heat stress can be reduced, and the deformation of the support body of the part can be avoided.

[0023] The material of the water cooling device body (2) is copper, which has the characteristics of fast heat conduction of copper alloy, and can achieve the best cooling effect. The water cooling device body (2) is internally provided with a cooling liquid channel (202). Specifically, the wall thickness of the water cooling device body (2) is 5 mm to 10 mm. When the wall thickness is less than 5 mm, the processing difficulty is relatively large, and too thin wall thickness can cause insufficient overall strength of the water cooling device, which can be damaged under external force during support removal. When the wall thickness is greater than 10 mm, more materials are used, but there is no obvious contribution to the function effect. Under the premise of ensuring that the cooling effect can fully play, the size and weight of the device are reduced as much as possible, and the processing materials and time are saved.

[0024] The third surface of the water cooling device body (2) is provided with a support body groove (201), which matches the support body of the laser additive manufacturing topologically optimized support part, so that the groove wall of the support body groove can be in contact with the support body. Specifically, the contact surface of the support body groove (201) and the support body of the laser additive manufacturing topologically optimized support part is integrally designed, so that the support body groove (201) matches the support body, and the groove wall of the support body groove can be in contact with the support body. Preferably, the size of the support body groove (201) of the water cooling device body (2) of the application is 1mm-2mm larger than the size of the support body, specifically the width of the support body groove (201) is 1mm-2mm larger than the outer diameter of the widest part of the support body, so that after the support body is matched with the support body groove (201), the support body has a single-sided active gap of 0.5mm-1mm. If the size difference is less than 1mm, the support body will be difficult to install when installed in the support body groove (201) due to the small space; if the size difference is greater than 2mm, the support body has too much space in the support body groove (201), and it is difficult to fix and limit the support body during subsequent support removal, increasing the operation difficulty.

[0025] The method for removing the support of the laser additive manufacturing topologically optimized support part provides a support removal auxiliary device, and the support to be removed of the laser additive manufacturing topologically optimized support part is constrained in the support limiting groove (402) of the support removal auxiliary device, so that the support body of the laser additive manufacturing topologically optimized support part is in contact with the groove wall of the support body groove (201) at the same time, and the cooling liquid is fed into the cooling liquid channel (202) of the support removal auxiliary device while the support to be removed is mechanically removed.

[0026] Specifically, the support removal auxiliary device is fixed on the surface of the workbench, the support to be removed of the laser additive manufacturing topologically optimized support part is constrained in the support limiting groove (402) of the support removal auxiliary device, the support body is in contact with the contoured groove wall surface of the support body groove (201), the cooling liquid is fed into the cooling liquid channel (202) of the support removal auxiliary device, and the support to be removed is mechanically removed using pliers, files and other tools. The laser additive manufacturing topologically optimized support part targeted by the removal method has the surface of the support to be removed flush with the surface of the support body, so that the constraint surface of the support to be removed and the support limiting groove (402) and the contact surface of the support body and the support body groove (201) are located in the same plane.

[0027] The removal method provided in the application is based on the provided support removal auxiliary device, that is, based on the combination of the water cooling device body (2) and the fixing device body (4), in the support removal process, the bracket body of the part is cooled by the water cooling device body (2), so as to reduce the thermal stress caused by the mechanical removal process. At the same time, the mechanical constraint action of the fixing device body (4) provides stable support for the part.

[0028] The application also provides a laser additive manufacturing method of a topologically optimized bracket part, comprising the following steps:

[0029] a) establishing a CAD digital model of a laser additive manufacturing topologically optimized bracket part;

[0030] b) according to the CAD digital model obtained in step a), using laser additive manufacturing to manufacture the part to obtain a laser additive manufacturing topologically optimized bracket part;

[0031] c) using any of the removal methods described above to remove the support of the laser additive manufacturing topologically optimized bracket part obtained in step b), to obtain a topologically optimized bracket.

[0032] Firstly, the application establishes a CAD digital model of a laser additive manufacturing topologically optimized bracket part. Specifically, the laser additive manufacturing topologically optimized bracket part comprises a support structure and a bracket body, and in this process, a suitable part placement angle is selected so that the support to be removed is flush with the surface of the bracket body. In the subsequent step, the bracket body is in contact with the contoured groove wall surface of the bracket body groove (201) of the water cooling device body (2), and if the support to be removed is not flush with the surface of the bracket body, when the support to be removed is constrained in the support limiting groove (402), it will hinder the full contact of the bracket body with the groove wall of the bracket body groove (201), and cannot achieve complete cooling effect.

[0033] After the application establishes a CAD digital model of a laser additive manufacturing topologically optimized bracket part, according to the CAD digital model obtained in step a), laser additive manufacturing is used to manufacture the part to obtain a laser additive manufacturing topologically optimized bracket part. In some embodiments of the application, GH4169 high-temperature alloy powder with a particle size of 15 μm~53 μm is placed in the powder bin of the laser additive manufacturing equipment, and according to the established CAD digital model, the part with support is manufactured by laser additive manufacturing technology to obtain a laser additive manufacturing topologically optimized bracket part.

[0034] After obtaining the topology-optimized support component from laser additive manufacturing, this invention uses any of the removal methods described above to remove the supports from the topology-optimized support component obtained in step b), thereby obtaining the topology-optimized support. After removing the supports from the topology-optimized support component obtained in step b), this invention further includes sandblasting the component after support removal to obtain the topology-optimized support component.

[0035] The present invention also provides a support removal auxiliary device for laser additive manufacturing topology optimization bracket parts, which is the same as the support removal auxiliary device described above, and will not be described again.

[0036] This invention provides a method for removing supports from topology-optimized support components manufactured using laser additive manufacturing, along with its application and an auxiliary device for support removal. During the support removal process of topology-optimized supports, the components are prone to deformation due to external forces, and the heat generated by mechanical grinding can cause the component temperature to rise, leading to increased thermal stress, exacerbating deformation, and severely affecting the dimensional accuracy and quality of the component. The removal method provided by this invention utilizes a conformal ceramic fixing structure, leveraging the high hardness and stability of the ceramic material to provide stable support for the component, effectively preventing deformation during support removal. Simultaneously, a conformal copper alloy cooling channel is manufactured and fixed to the surface of the ceramic fixing structure, allowing the copper alloy cooling channel to contact the support. Cooling water circulates within the channel, effectively removing heat generated during mechanical action and cooling the support, thus preventing thermal stress caused by temperature rise and further preventing component deformation. This innovative support removal method combines the supporting function of ceramic with the cooling function of the copper alloy cooling channel, achieving protection of the component during support removal, improving the dimensional accuracy and quality stability of the component, reducing production costs, and increasing production efficiency. Attached Figure Description

[0037] Figure 1 This is a front view of the support bracket in Embodiment 1 of the present invention;

[0038] Figure 2 This is a right view of the support bracket in Embodiment 1 of the present invention;

[0039] Figure 3 This is a top view of the support bracket in Embodiment 1 of the present invention;

[0040] Figure 4 This is a front view of the main body of the water-cooling device in Embodiment 1 of the present invention;

[0041] Figure 5 This is a right view of the main body of the water-cooling device in Embodiment 1 of the present invention;

[0042] Figure 6It is the top view of the water cooling device main body in the embodiment 1 of the application;

[0043] Figure 7 It is the front view of the fixing device main body in the embodiment 1 of the application;

[0044] Figure 8 It is the right view of the fixing device main body in the embodiment 1 of the application;

[0045] Figure 9 It is the top view of the fixing device main body in the embodiment 1 of the application;

[0046] Figure 10 It is the sectional view of A-A of Figure 7

[0047] Figure 11 It is the assembly relationship schematic view of each part in the embodiment 1 of the application;

[0048] Figure 12 It is the partial enlarged view of B in Figure 11

[0049] Wherein, 1 is a support main body, 2 is a water cooling device main body, 201 is a support main body groove, 202 is a cooling liquid channel, 4 is a fixing device main body, 401 is a groove, 402 is a support limiting groove, 5 is a support to be removed, 7 is a semi-closed structure cavity, 8 is a bolt hole, 9 is a rubber gasket, 10 is a bolt, and 11 is a workbench. DETAILED DESCRIPTION

[0050] The application discloses a support removal method for laser additive manufacturing of a topologically optimized support part and application and a support removal auxiliary device.Those skilled in the art can refer to the content herein and appropriately improve process parameters for implementation.It should be particularly pointed out that all similar replacements and changes are obvious to those skilled in the art and are regarded as being included in the application.The method and application of the application have been described through preferred embodiments, and relevant personnel can obviously make changes or appropriate changes and combinations to the method and application herein without departing from the content, spirit and scope of the application to realize and apply the technology of the application.

[0051] The application provides a laser additive manufacturing and support removal method for a GH4169 high-temperature alloy topologically optimized support, as shown in Figures 1-12 Figure 1 It is the front view of the support bracket with support in the embodiment 1 of the application; Figure 2 It is the right view of the support bracket with support in the embodiment 1 of the application; Figure 3 It is the top view of the support bracket with support in the embodiment 1 of the application; Figure 4 It is the front view of the water cooling device main body in the embodiment 1 of the application; Figure 5It is a right view of the water cooling device main body in the embodiment 1 of the present application; Figure 6 It is a top view of the water cooling device main body in the embodiment 1 of the present application; Figure 7 It is a front view of the fixing device main body in the embodiment 1 of the present application; Figure 8 It is a right view of the fixing device main body in the embodiment 1 of the present application; Figure 9 It is a top view of the fixing device main body in the embodiment 1 of the present application; Figure 10 It is Figure 7 The sectional view of A-A; Figure 11 It is an assembly relationship schematic view of each part in the embodiment 1 of the present application; Figure 12 It is Figure 11 The partial enlarged view of B.

[0052] The present application is further described below in combination with embodiments:

[0053] Embodiment 1

[0054] The embodiment gives a laser additive manufacturing and support removal method of a GH4169 high-temperature alloy topological optimization support, which comprises the following steps:

[0055] Step one: a CAD digital model of the GH4169 high-temperature alloy topological optimization support 1 is established.

[0056] Step two: taking the GH4169 high-temperature alloy powder with the particle size between 15 μm and 53 μm as the raw material, the support 1 with support is manufactured by the laser selective melting additive manufacturing technology according to the CAD digital model established in step one. The process parameters used are: laser power 280 W, laser scanning speed 990 mm / s, layer thickness 60 μm.

[0057] Step three: a copper alloy water cooling device main body 2 is made, the surface shape of which matches the support main body 1, and the inside is provided with a cooling liquid channel 202. The wall thickness of the water cooling device main body 2 is 5 mm, and the size of the support main body groove 201 is 1 mm larger than that of the support main body 1.

[0058] Step four: a ceramic fixing device main body 4 is made, which is provided with a groove 401 and a support limiting groove 402 on the surface, the surface shape of the groove 401 matches the water cooling device main body 2, the inside is provided with a semi-closed honeycomb-shaped cavity 7, and both ends are provided with four bolt holes 8. The wall thickness of the fixing device main body 4 is 10 mm, and the size of the groove 401 is 1 mm larger than that of the water cooling device 2. The surface shape of the support limiting groove 402 matches the support to be removed 5, the size of the support limiting groove 402 is 1 mm larger than that of the support to be removed 5, and the depth is 1 / 2 of the support to be removed 5.

[0059] Step five: liquid epoxy resin is poured into the cavity 7 of the fixing device main body 4;

[0060] Step six: Put the fixing device body 4 into the heating furnace for heating to make the epoxy resin solidify.

[0061] Step seven: Fix the rubber gasket 9 on the surface of the supporting limiting groove 402 by adhesion. The shape of the gasket 9 is the same as that of the supporting limiting groove 402, and the size is 1 mm smaller than that of the supporting limiting groove 402.

[0062] Step eight: Fix the water cooling device body 2 on the surface of the fixing device body 4 by adhesion to form a combination, which is the supporting removal auxiliary tool.

[0063] Step nine: Fix the combination of the water cooling device body 2 and the fixing device body 4 on the surface of the workbench 11 by the bolt 10.

[0064] Step ten: Place the support body 1 on the combination of the water cooling device body 2 and the fixing device body 4, so that the support body 1 and the support body groove 201 of the water cooling device body 2 are in contact with the surface.

[0065] Step eleven: Remove the support 5 by using pliers, files and other tools, and at the same time, pour cooling water into the cooling liquid channel 202 to cool the support body 1.

[0066] Step twelve: Perform sandblasting treatment on the support body 1 after the support is removed, and complete the manufacturing of the support body 1.

[0067] Example 2

[0068] The embodiment provides a laser additive manufacturing and support removal method of a TC4 titanium alloy topological optimization support, and the method comprises the following steps:

[0069] Step one: Establish a CAD digital model of the TC4 titanium alloy topological optimization support 1.

[0070] Step two: Take TC4 titanium alloy powder with a particle size of 15-53 μm as a raw material, and complete the manufacturing of the support 1 with support according to the CAD digital model established in step one by using a laser selective melting additive manufacturing technology. The process parameters used are as follows: laser power 280 W, laser scanning speed 1250 mm / s, and layer thickness 60 μm.

[0071] Step three: Make a copper alloy water cooling device body 2 with a surface shape matching the support body 1, and the water cooling device body 2 is internally provided with a cooling liquid channel 202. The wall thickness of the water cooling device body 2 is 10 mm, and the size of the support body groove 201 is 2 mm larger than that of the support body 1.

[0072] Step four: make a ceramic fixing device body 4, which is provided with a groove 401 and a support limiting groove 402 on the surface, the surface shape of the groove 401 matches the water cooling device body 2, and a semi-closed honeycomb cavity 7 is arranged inside, and four bolt holes 8 are arranged at both ends. The wall thickness of the fixing device body 4 is 30mm, and the size of the groove 401 is 2mm larger than that of the water cooling device body 2. The surface shape of the support limiting groove 402 matches the support to be removed 5, and the size of the support limiting groove 402 is 2mm larger than that of the support to be removed 5, and the depth is 2 / 3 of the support to be removed 5.

[0073] Step five: pour liquid epoxy resin into the cavity 7 of the fixing device body 4.

[0074] Step six: place the fixing device body 4 into a heating furnace for heating to solidify the epoxy resin.

[0075] Step seven: fix the rubber gasket 9 on the surface of the support limiting groove 402 by adhesion. The shape of the gasket 9 is the same as that of the support limiting groove 402, and the size is 2mm smaller than that of the support limiting groove 402.

[0076] Step eight: fix the water cooling device body 2 on the surface of the fixing device body 4 by adhesion, so that the two form a combination, which is the support removal auxiliary tool of the present application.

[0077] Step nine: fix the combination of the water cooling device body 2 and the fixing device body 4 on the surface of the workbench 11 by the bolt 10.

[0078] Step ten: place the bracket 1 on the combination of the water cooling device body 2 and the fixing device body 4, so that the bracket body 1 and the bracket body groove 201 of the water cooling device body 2 are in contact with the shaped surface.

[0079] Step eleven: use pliers, files and other tools to remove the support to be removed 5, and at the same time, cooling water is supplied into the cooling liquid channel 202 to cool the bracket body 1.

[0080] Step twelve: sandblast the bracket body 1 after the support is removed to complete the manufacture of the bracket body 1.

[0081] Example 3

[0082] The embodiment gives a laser additive manufacturing and support removal method of a GH5188 high-temperature alloy topologically optimized bracket, which comprises the following steps:

[0083] Step one: establish a CAD digital model of the GH5188 high-temperature alloy topologically optimized bracket 1.

[0084] Step two: using GH5188 superalloy powder with particle size between 15 μm and 53 μm as raw material, and according to the CAD digital model established in step one, a support 1 with support is manufactured by laser selective melting additive manufacturing technology. The process parameters used are: laser power 280 W, laser scanning speed 980 mm / s, layer thickness 60 μm.

[0085] Step three: a copper alloy water cooling device main body 2 is made, which has a surface shape matching the support main body 1 and is internally provided with a cooling liquid channel 202. The wall thickness of the water cooling device main body 2 is 8 mm, and the size of the support main body groove 201 is 1.5 mm larger than that of the support main body 1.

[0086] Step four: a ceramic fixing device main body 4 is made, which is provided with a groove 401 and a support limiting groove 402 on the surface, the groove 401 has a surface shape matching the water cooling device main body 2, is internally provided with a semi-closed honeycomb-shaped cavity 7, and is provided with four bolt holes 8 at both ends. The wall thickness of the fixing device main body 4 is 25 mm, and the size of the groove 401 is 1.5 mm larger than that of the water cooling device 2. The surface shape of the support limiting groove 402 matches the to-be-removed support 5, the size of the support limiting groove 402 is 1.5 mm larger than that of the to-be-removed support 5, and the depth is 1 / 2 of the to-be-removed support 5.

[0087] Step five: liquid epoxy resin is poured into the cavity 7 of the fixing device main body 4.

[0088] Step six: the fixing device main body 4 is placed in a heating furnace for heating to solidify the epoxy resin.

[0089] Step seven: the rubber gasket 9 is fixed on the surface of the support limiting groove 402 by adhesion. The shape of the gasket 9 is the same as that of the support limiting groove 402, and the size is 1.5 mm smaller than that of the support limiting groove 402.

[0090] Step eight: the water cooling device main body 2 is fixed on the surface of the fixing device main body 4 by adhesion, so that the two form a combination, which is the support-removing auxiliary tool of the application.

[0091] Step nine: the combination of the water cooling device main body 2 and the fixing device main body 4 is fixed on the surface of the workbench 11 by the bolt 10.

[0092] Step ten: the support main body 1 is placed on the combination of the water cooling device main body 2 and the fixing device main body 4, so that the support main body groove 201 of the support main body 1 is in contact with the shaped surface of the water cooling device main body 2.

[0093] Step eleven: using pliers, files and other tools to remove the to-be-removed support 5, and at the same time, cooling water is introduced into the cooling liquid channel 202 to cool the support main body 1.

[0094] Step twelve: sandblasting treatment is conducted on the stent body 1 after the support is removed, and the manufacturing of the stent body 1 is completed.

[0095] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent replacements or changes to the technical solutions and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of support removal for laser additive manufacturing of a topologically optimized support part, characterized in that, Comprising the following steps: S1) providing a support removal auxiliary device, which comprises a fixing device body (4) and a water cooling device body (2); the fixing device body (4) comprises opposite first and second surfaces; the water cooling device body (2) comprises opposite third and fourth surfaces; The first surface of the fixing device body (4) has a groove (401) and a support limiting groove (402); the water cooling device body (2) is placed in the fixing device body (4) through the groove (401), so that the third surface of the water cooling device body (2) is flush with the first surface of the fixing device body (4); the support limiting groove (402) can constrain the to-be-removed support of the laser additive manufacturing topologically optimized support part; The third surface of the water cooling device body (2) is provided with a support body groove (201) matched with the support body of the laser additive manufacturing topologically optimized support part, so that the groove wall of the support body groove can be in contact with the support body; the inside of the water cooling device body (2) is provided with a cooling liquid channel (202); S2) constrain the to-be-removed support of the laser additive manufacturing topologically optimized support part in the support limiting groove (402) of the support removal auxiliary device, so that the support body of the laser additive manufacturing topologically optimized support part is in contact with the groove wall of the support body groove (201) at the same time, and the to-be-removed support is mechanically removed while the cooling liquid is fed into the cooling liquid channel (202) of the support removal auxiliary device.

2. The removal method according to claim 1, characterized by, In step S1), the wall thickness of the fixing device body (4) is 10 mm~30 mm; the size of the groove (401) is 1mm~2mm larger than the size of the water cooling device body (2); the size of the support limiting groove (402) is 1mm~2mm larger than the size of the to-be-removed support, and the depth is 1 / 2~2 / 3 of the to-be-removed support; The wall thickness of the water cooling device body (2) is 5 mm~10 mm; the size of the support body groove (201) is 1mm~2mm larger than the size of the support body.

3. The removal method according to claim 1, characterized by, In step S1), the fixing device body (4) is also provided with a plurality of semi-closed structure cavities (7) with one end open and the other end closed.

4. The removal method according to claim 3, characterized by, The semi-closed structure cavities (7) are also filled with solidified resin.

5. The removal method according to claim 1, characterized by, In the laser additive manufacturing topologically optimized support part, the to-be-removed support is flush with the surface of the support body, so that the constraint surface of the to-be-removed support and the contact surface of the support body and the support body groove (201) are located in the same plane.

6. A method of laser additive manufacturing of a topologically optimized stent part, characterized in that, Comprising the following steps: a) establishing a CAD digital model of a laser additive manufacturing topologically optimized support part; b) according to the CAD digital model obtained in step a), using laser additive manufacturing to manufacture the part to obtain a laser additive manufacturing topologically optimized support part; c) removing the support of the laser additive manufacturing topologically optimized support part obtained in step b) by using the removing method in any one of claims 1-5 to obtain a topologically optimized support.

7. A support removal assist device for laser additive manufacturing of a topologically optimized support part, characterized in that The fixing device body (4) includes opposite first and second surfaces, and the water cooling device body (2) includes opposite third and fourth surfaces. The first surface of the fixing device body (4) is provided with a recess (401) and a support limiting groove (402), the water cooling device body (2) is placed in the fixing device body (4) through the recess (401), so that the third surface of the water cooling device body (2) is flush with the first surface of the fixing device body (4), and the support limiting groove (402) can constrain the support to be removed of the laser additive manufacturing topologically optimized support part. The third surface of the water cooling device body (2) is provided with a support body groove (201) matched with the support body of the laser additive manufacturing topologically optimized support part, so that the groove wall of the support body groove can be in contact with the support body, and the inside of the water cooling device body (2) is provided with a cooling liquid channel (202).

8. The support removal aid of claim 7, wherein, The wall thickness of the fixing device body (4) is 10-30 mm, the size of the recess (401) is 1-2 mm larger than the size of the water cooling device body (2), and the size of the support limiting groove (402) is 1-2 mm larger than the size of the support to be removed, and the depth is 1 / 2-2 / 3 of the support to be removed. The wall thickness of the water cooling device body (2) is 5-10 mm, and the size of the support body groove (201) is 1-2 mm larger than the size of the support body.

9. The support removal aid of claim 7, wherein, The fixing device body (4) is also provided with a plurality of semi-closed structure cavities (7) with one end open and the other end closed.

10. The support removal aid of claim 9, wherein, The semi-closed structure cavities (7) are also filled with solidified resin.

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