Laser additive manufacturing device and production process thereof

Abstract

The invention discloses a laser additive manufacturing device which comprises a forming assembly, a laser and an arrangement assembly, the forming assembly comprises a material chamber, a lifting table is arranged in the material chamber, a base is arranged on the lifting table, a plurality of vibrating rods are arranged in the material chamber, and the vibrating rods are evenly distributed in the circumferential direction of the lifting table in an array mode. The vibration rod vibrates in a high-frequency vibration mode; the invention further discloses a production technology of the laser additive manufacturing device, the production technology comprises the steps that the lifting table is lifted to the highest height, material powder is added, the lifting table is descended, the powder covers the lifting table, the vibration rod is started, the arrangement roller removes the powder exceeding the lifting table, the laser is driven to sinter a specified structure on the base, and the steps are repeated. And sintering and molding the product. According to the laser additive manufacturing device and the production process thereof, material powder laying is more uniform, accuracy is higher during laser sintering, and stability and integrity of products are facilitated.

Description

Technical Field

[0001] The invention relates to the field of laser manufacturing machines, in particular to a laser additive manufacturing device and a production process thereof. Background Art

[0002] The laser additive manufacturing device is a manufacturing machine that uses laser additive manufacturing technology. Laser additive manufacturing technology uses the additive manufacturing principle of rapid prototyping "discrete-accumulation". The laser fused structure obtained on the surface or local area of ​​the part is superimposed layer by layer through the layer-by-layer laser cladding method until the entire three-dimensional solid part is manufactured. Compared with traditional subtractive manufacturing, the parts produced by laser additive manufacturing technology are not only dense and have superior performance, but also can achieve moldless manufacturing and rapid prototyping for large or complex parts. Therefore, laser additive manufacturing technology has received widespread attention in the fields of aviation, aerospace, shipbuilding, and medical care, especially in the field of corresponding mold parts, which have complex and diverse structures and are difficult to produce, so they are widely produced and applied in mold parts.

[0003] Laser material processing technology requires first creating a CAD model on a computer, then spreading a layer of ultrafine metal powder with a thickness of 20 to 100 μm on a powder bed, and then the laser selectively sintering the powder according to the plane contour of the model. After sintering, the workbench descends and new material powder is spread on the workbench, and the above steps are repeated until the final part is formed.

[0004] However, it is difficult to ensure the uniformity of powder laying during the powder spreading process, so that when the material powder is sintered, the thin powder area will cause secondary sintering of the already sintered material powder, destroying the sintered structure, while the thick powder area will result in incomplete sintering of the powder. Both situations are not conducive to the stability and integrity of the finished product structure. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a laser additive manufacturing device and a production process thereof that makes material powder laying more uniform, increases accuracy during laser sintering, and is beneficial to the stability and integrity of the product.

[0006] The technical solution adopted by the present invention to solve the above-mentioned problem is: a laser additive manufacturing device, including a molding component for placing manufacturing materials, a laser for sintering materials and a finishing component for evenly distributing powder materials in the molding component, the molding component includes a material chamber for accommodating materials, a lifting platform is provided in the material chamber, a base for placing products is provided on the lifting platform, the material height in the material chamber is not lower than the lowest height of the lifting platform, and the highest height of the lifting platform is equal to the laser sintering height, a vibrating rod is provided in the material chamber, a plurality of vibrating rods are provided, and the plurality of vibrating rods are evenly distributed in an array along the circumference of the lifting platform, and the vibrating rod vibrates in a high-frequency vibration manner.

[0007] Compared with the prior art, the advantages of the present invention are: manufacturing material powder is placed in the material chamber, and in each sintering process, the material powder is obtained from the material chamber by utilizing the height difference through the descending process of the lifting platform, and then the lifting platform is raised to a fixed height for sintering, and there is no need to adjust the sintering height of the laser. After the laser is adjusted to focus on the sintering thickness area, it only needs to move in the horizontal direction, thereby achieving sintering stability and accuracy. The material powder is ultrafine metal powder, and the vibration of the vibrating rod can make the material powder more compact, eliminate the gaps and bubbles between the material powders, and achieve uniform vibration balance. The vibration mode of the vibrating rod vibrates in the horizontal direction, and will not form upper and lower amplitudes, resulting in a tight lower and loose upper laying form, thereby ensuring the uniformity of material powder laying, especially the uniformity and density of the sintering surface, thereby ensuring the sintering quality of the product, and at the same time, it can also make the upper surface of the manufacturing material smoother, and when the components are processed, it is faster and more accurate.

[0008] As an improvement of the present invention, a placement groove for placing the base is provided on the lifting platform, and the placement groove is composed of a moving seat and an inner wall of the lifting platform that are sealed and movably connected inside the lifting platform, and the base is arranged in the upper center area of ​​the moving seat, the depth of the placement groove is not less than the height of the base, and the placement groove is circular. Through the improvement, the lifting and lowering operation of the base is realized by lifting and lowering the placement groove, thereby realizing additive processing of the product. After each layer of sintering is completed, the moving seat is controlled to descend one layer of sintering thickness relative to the lifting platform, and then a new layer of sintering operation is performed, thereby realizing additive sintering of the product without changing the movement of the lifting platform; wherein the design that the depth of the placement groove is not less than or equal to the height of the base is to ensure that the base does not protrude from the lifting platform, thereby affecting the flatness of the upper end surface of the lifting platform and causing interference with the movement of the subsequent finishing roller; wherein the base is arranged in the upper center area of ​​the moving seat and the placement groove is circular, both of which are to ensure the uniformity of vibration transmission of the vibrating rod, thereby ensuring the uniformity of material powder laying, so as to ensure the sintering quality.

[0009] As an improvement of the present invention, a movable connecting ring is provided at the other end of the movable seat away from the base, and a movable seat engaging groove is provided in the lifting platform which is sealed and movably connected to the movable connecting ring. Through the improvement, the movement stability between the movable seat and the lifting platform is ensured, and deviation during the movement is avoided, thereby affecting the sintering accuracy of the product.

[0010] As an improvement of the present invention, the finishing assembly includes a transmission screw and a guide rod, a finishing roller is provided between the transmission screw and the guide rod, the finishing roller is against the top surface of the placement groove, and the length of the finishing roller is longer than the maximum diameter of the placement groove. Through the improvement, after the material powder is vibrated and laid, there will be excess material powder retained on the upper surface of the base. At this time, the finishing roller needs to move back and forth to remove the excess material powder to avoid affecting the laser sintering process; wherein the double connection of the transmission screw and the guide rod can ensure the stability of the finishing roller and the laying effect.

[0011] As an improvement of the present invention, a guide ring is provided on the side of the lifting platform away from the base, and a connecting outer wall movably connected to the guide ring is provided in the material chamber, and the connecting outer wall is arranged on the outer side of the guide ring. A connecting inner wall movably connected to the guide ring is also provided in the material chamber, and the connecting inner wall is arranged on the inner side of the guide ring. The guide ring is sealed and movably connected between the connecting outer wall and the connecting inner wall. Through the improvement, the radial movement of the lifting platform can be limited by the setting of the connecting outer wall, and the stability of the longitudinal movement of the lifting platform can be ensured. During the movement of the lifting platform, there will be a large amount of material powder at the connection between the lifting platform and the connecting outer wall. If the material powder enters the bottom of the lifting platform, it will affect the descent stability and descent accuracy of the lifting platform, which is not conducive to subsequent laser additive processing. The design of the guide ring sealing and movably connected between the connecting outer wall and the connecting inner wall, through the guide ring being clamped between the connecting outer wall and the connecting inner wall, it is not easy to form a gap between the guide ring and the connecting outer wall, so that the material powder can be arranged above the connecting outer wall and the side of the guide ring, and it is not easy to enter the bottom of the lifting platform, thereby not affecting the lifting function of the lifting platform.

[0012] As another improvement of the present invention, the guide ring is arranged at the outer edge of the lifting platform, and the inner side of the guide ring is provided with a lifting platform engaging groove which is engaged with the connecting inner wall. Through the improvement, through the design of the lifting platform engaging groove, the lifting platform can clamp and fix the connecting inner wall, that is, to avoid deformation of the connecting inner wall, which in turn affects the connection stability and sealing between the connecting outer wall and the lifting platform, and at the same time can also ensure the smoothness and accuracy of the movement of the lifting platform, so that a mutually restrained and mutually stable connection effect is formed among the lifting platform, the connecting inner wall and the connecting outer wall.

[0013] As another improvement of the present invention, the lifting platform is provided with a plurality of positioning columns, the base is provided with a plurality of fixing pins that cooperate with the positioning columns and are used to fix the base on the lifting platform, the fixing pins are arranged on the sides of the base, and the positioning columns are provided with fixing holes that cooperate with the fixing pins. Through the improvement, the upper surface of the base can be free of mounting parts and is smoother, which is conducive to the laser sintering processing of the product.

[0014] As another improvement of the present invention, a positioning groove is provided on the base, and the depth of the positioning groove is the sintering thickness. Through the improvement, during the laser sintering process, the material of the base is a high-temperature resistant material and is not easily affected by stimulated sintering. Through the design of the positioning groove, material powder can be laid in the positioning groove, and then the material powder in the positioning groove is sintered and formed. The accuracy of the laser sintering alignment and the accuracy of the sintering thickness can be judged by observing the forming condition of the material powder in the positioning groove. If the sintering alignment is inaccurate, sintering marks will be formed around the positioning groove, and if the sintering thickness is inaccurate, the material powder in the positioning groove will not be formed well. At the same time, after the material powder in the positioning groove is sintered and formed, a sintering adhesion area can be formed for the sintering of the first layer of the product, that is, the first layer of the sintered structure of the product will adhere to the positioning groove during sintering. The shaped structure undergoes sintering and adhesion, thereby ensuring the stable forming of the product on the base, and the product will not shift due to the stability of the base. After completing the sintering of the material powder in the positioning groove, the sintered structure can be taken out for observation. If the upper surface is well sintered and the lower surface is not well sintered, the sintering height positioning of the laser is poor, or the sintering thickness of the laser is not up to standard; if the upper surface is not well sintered and the lower surface is well sintered, it also means that the sintering height positioning of the laser is poor, or the sintering thickness of the laser is not up to standard. If both the upper and lower surfaces are not well sintered, it means that the sintering thickness of the laser is not up to standard. If both the upper and lower surfaces are well sintered, the bottom of the positioning groove can be observed to see if there is a high-temperature color change reaction to determine the accuracy of the sintering lower end position, and then slowly reduce the sintering thickness until the critical sintering thickness is reached.

[0015] The technical solution adopted by the present invention to solve the above-mentioned problem is a production process of a laser additive manufacturing device, which is used for a production operation of a laser additive manufacturing device, and the steps are as follows:

[0016] S1: Raise the lifting platform to the highest height, and the upper end surface of the base and the upper end surface of the lifting platform form a distance of sintering thickness;

[0017] S2: Add the material powder to be laser sintered into the material chamber, and the powder height is the same as the upper plane of the lifting platform;

[0018] S3: The lifting platform descends so that the powder covers the lifting platform;

[0019] S4: Start the vibrating rod to compact the powder in the lifting platform and eliminate the gaps in the powder;

[0020] S5: The vibrating rod keeps vibrating, and the lifting platform rises to the highest height, at which time the lifting platform abuts against the lower end of the finishing drum;

[0021] S6: turn off the vibrator;

[0022] S7: The finishing roller reciprocates two to three times to remove the powder on the upper surface of the lifting table that exceeds the lifting table;

[0023] S8: driving the laser to sinter a specified structure on the base along a specified path;

[0024] S9: After the layer structure is sintered and cooled, the finishing roller moves back and forth two to three times to remove the powder adhering to the upper end surface of the sintered structure during the sintering process;

[0025] S10: The moving seat moves the base downward by one sintering thickness layer, and repeats the steps of S1-S9 until the product is sintered and formed.

[0026] Compared with the prior art, the advantages of the present invention are as follows: manufacturing material powder is placed in the material chamber, and in each sintering process, the material powder is obtained from the material chamber by utilizing the height difference through the descending process of the lifting platform, and then the lifting platform is raised to a fixed height for sintering, and there is no need to adjust the sintering height of the laser. After the laser is adjusted to focus on the sintering thickness area, it only needs to move in the horizontal direction, thereby achieving sintering stability and accuracy. The material powder is ultrafine metal powder, and the vibration of the vibrating rod can make the material powder more compact, eliminate the gaps and bubbles between the material powders, and uniformly The vibration balance of the cloth ensures the uniformity of the material powder laying, thereby ensuring the sintering quality of the product, and can also make the upper surface of the manufacturing material smoother, so that the processed components can be processed faster and more accurately; in step S9, because a high temperature environment is formed during the laser sintering process, thereby forming an airflow, part of the material powder will have dust, causing a very small amount of material powder in the non-sintering area to adhere to the sintering area, and the adhesion is not strong, but it is not conducive to the high density of subsequent operations, and bubbles are prone to exist. Therefore, after the sintering of this layer is completed, it is necessary to remove the material powder adhered by the dust phenomenon through finishing copper rolling.

[0027] As another improvement of the present invention, the step of:

[0028] S0.1: The moving seat drives the base to move so that the upper plane of the base is flush with the upper plane of the lifting platform;

[0029] S0.2: Take an appropriate amount of material powder and sprinkle it on the base to fill the positioning groove;

[0030] S0.3: The finishing roller moves back and forth two or three times to remove the powder overflowing from the positioning groove on the base;

[0031] S0.4: sintering the powder in the positioning groove;

[0032] S0.5: According to the sintering state of the powder in the positioning groove, the accuracy of the sintering alignment of the laser and the accuracy of the sintering thickness are judged. Through the improvement, during the laser sintering process, the material of the base is a high-temperature resistant material, which is not easily affected by stimulated sintering. Through the design of the positioning groove, the material powder can be laid in the positioning groove, and then the material powder in the positioning groove is sintered and formed. The accuracy of the sintering alignment of the laser and the accuracy of the sintering thickness are judged by observing the forming condition of the material powder in the positioning groove. If the sintering alignment is inaccurate, sintering marks will be formed around the positioning groove. If the sintering thickness is inaccurate, the material powder in the positioning groove will not be well formed. At the same time, after the material powder in the positioning groove is sintered and formed, a sintering adhesion area can be formed for the sintering of the first layer of the product. That is, the first layer sintering structure of the product will be sintered and adhered to the formed structure in the positioning groove during sintering, thereby ensuring the stable forming of the product on the base and preventing the product from shifting due to the stability of the base. Therefore, through the design of steps S0.1-S0.5, the sintering operation of the laser is pre-sintered to judge the operating quality of the laser to ensure high-quality forming during subsequent sintering. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0034] Figure 2 It is a schematic diagram of the cross-sectional structure of the material chamber of the present invention.

[0035] Figure 3 It is a schematic diagram of the base installation structure of the present invention.

[0036] As shown in the figure: 1. Laser, 2. Sorting component, 2.1. Transmission screw, 2.2. Guide rod, 2.3. Sorting roller, 2.4. Connecting rod, 3. Material chamber, 4. Lifting platform, 4.1. Placement groove, 4.2. Guide ring, 4.2.1. Lifting platform fitting groove, 4.3. Positioning column, 4.4. Fixing pin, 4.5. Fixing hole, 4.6. Moving seat fitting groove, 5. Base, 5.1. Positioning groove, 6. Vibrating rod, 7. Connecting outer wall, 8. Connecting inner wall, 9. Moving seat, 9.1. Moving connecting ring. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0038] like Figure 1-2As shown, a laser additive manufacturing device includes a molding component for placing manufacturing materials, a laser 1 for sintering materials and a finishing component 2 for evenly distributing powder materials in the molding component, the molding component includes a material chamber 3 for accommodating materials, a lifting platform 4 is provided in the material chamber 3, a base 5 for placing products is provided on the lifting platform 4, the material height in the material chamber 3 is not lower than the lowest height of the lifting platform 4, and the highest height of the lifting platform 4 is equal to the laser sintering height, a vibrating rod 6 is provided in the material chamber 3, four vibrating rods 6 are provided, and the four vibrating rods 6 are evenly distributed in an array along the circumference of the lifting platform 4, the vibrating rod 6 is horizontally vibrated in a high-frequency vibration mode, and the height of the vibrating rod 6 is lower than the height of the material powder, and the vibration frequency is 300-1000HZ, which can make the manufacturing material more compact, and the product structure is more stable during laser sintering, and at the same time, the manufacturing material can be laid more smoothly, which is beneficial to product sintering.

[0039] The lifting platform 4 is provided with a placement groove 4.1 for placing the base 5. The placement groove 4.1 is composed of a moving seat 9 sealed and movably connected inside the lifting platform 4 and the inner wall of the lifting platform 4. The base 5 is arranged in the upper center area of ​​the moving seat 9. The depth of the placement groove 4.1 is not less than the height of the base 5, and the placement groove 4.1 is circular. The other end of the moving seat 9 away from the base 5 is provided with a moving connection ring 9.1. The lifting platform 4 is provided with a moving seat interlocking groove 4.6 which is sealed and movably connected to the moving connection ring 9.1.

[0040] The finishing assembly 2 includes a transmission screw 2.1 and a guide rod 2.2, a finishing roller 2.3 is provided between the transmission screw 2.1 and the guide rod 2.2, the finishing roller 2.3 is against the top surface of the placement groove 4.1, the length of the finishing roller 2.3 is longer than the maximum diameter of the placement groove 4.1, and the two ends of the finishing roller 2.3 are movably connected to the transmission screw 2.1 and the guide rod 2.2 through a connecting rod 2.4, wherein the connecting rod 2.4 connected to the transmission screw 2.1 is connected to the transmission screw 2.1 through a screw transmission, and when the transmission screw 2.1 rotates, the connecting rod 2.4 can be driven to move along the axial direction of the transmission screw 2.1, thereby realizing the movement of the finishing roller 2.3, so that the manufacturing material powder is laid more evenly, and the guide rod 2.2 can make the movement of the finishing roller 2.3 more stable, and a motor for driving the transmission screw 2.1 to rotate is provided at one end of the transmission screw 2.1, and the motor and the transmission screw 2.1 are connected through a gear transmission.

[0041] A guide ring 4.2 is provided on the side of the lifting platform 4 away from the base 5, and a connecting outer wall 7 movably connected to the guide ring 4.2 is provided in the material chamber 3, and the connecting outer wall 7 is provided on the outer side of the guide ring 4.2. A connecting inner wall 8 movably connected to the guide ring 4.2 is also provided in the material chamber 3, and the connecting inner wall 8 is provided on the inner side of the guide ring 4.2. The guide ring 4.2 is sealingly and movably connected between the connecting outer wall 7 and the connecting inner wall 8. The guide ring 4.2 is provided at the outer edge of the lifting platform 4, and a lifting platform fitting groove 4.2.1 is provided on the inner side of the guide ring 4.2 and is fitted with the connecting inner wall 8.

[0042] like Figure 3 As shown, the lifting platform 4 is provided with a plurality of positioning columns 4.3, the base 5 is provided with a plurality of fixing pins 4.4 that cooperate with the positioning columns 4.3 and are used to fix the base 5 on the lifting platform 4, the fixing pins 4.4 are arranged on the side of the base 5, and the positioning columns 4.3 are provided with fixing holes 4.5 that cooperate with the fixing pins 4.4.

[0043] The base 5 is provided with a positioning groove 5.1, the depth of which is the sintering thickness. The positioning groove 5.1 can be designed differently according to the product to be manufactured, such as Figure 2 As shown, the positioning groove 5.1 is a spherical bottom, which can be used for sintering of spherical structures, positioning the sintered products, making it difficult for the products to shift during the movement of the lifting platform 4, ensuring the sintering quality of the products during the sintering process and improving the product quality. More applications are that the positioning groove 5.1 is ring-shaped to ensure the intersection and adhesion of diversified products.

[0044] The laser additive manufacturing device also includes an additive device for adding manufacturing materials into the material chamber 3. The additive device uses a porous powder outlet method to add materials, which can also make the distribution of manufacturing materials more uniform. The additive device has been widely used in laser additive equipment and belongs to conventional technology. The inventor has not improved the additive device and has not marked it in the accompanying drawings of the embodiment.

[0045] The laser 1 includes a laser emitting head, which is fixedly connected to a moving base. The moving base can move horizontally and vertically on the same plane through a moving guide rail, thereby ensuring the distance between the laser emitting head and the manufacturing material, ensuring the sintering efficiency of the laser emitting head, and achieving the sintering effect on the entire plane. The moving base realizes the purpose of horizontal and vertical movement on the moving guide rail through two motors.

[0046] like Figure 2As shown, a lifting shaft is provided at the bottom of the lifting platform 4, and the lifting shaft is fixedly connected to the lifting platform 4. The lifting shaft is connected to a motor through gear transmission. The lifting shaft is driven by the motor to realize the up and down movement of the lifting shaft, and then the up and down movement of the lifting platform 4 is realized. The motor drives the lifting shaft to move up and down, which belongs to conventional technology. Similarly, a motor is provided inside the lifting platform 4 to drive the moving seat 9 to move up and down.

[0047] The motor driving the lifting platform 4 to move up and down has a low precision requirement, so as to ensure that the powder is taken from the material chamber 3 by utilizing the height difference and the upper end surface of the lifting platform 4 is mainly connected with the finishing roller 2.3. The motor used to drive the moving seat 9 to move up and down needs to ensure the distance of the moving seat 9 to move up and down, and ensure the sintering efficiency of the laser 1 when the laser 1 sinters the material powder, so as to avoid the situation that when the moving seat 9 descends too far, the sintered part is offset from the original part, and when the moving seat 9 descends too short, the sintered part is destroyed when the material powder is sintered. The lifting shaft and the motor are connected through gear transmission, so that the reduction ratio between the lifting shaft and the motor can be controlled, and according to the sintering efficiency of the laser 1, the purpose of controlling the descent of the moving seat 9 by 20 to 100 μm can be achieved.

[0048] A production process of a laser additive manufacturing device is used for a production operation of a laser additive manufacturing device, and the steps are as follows:

[0049] S0.1: The moving seat 9 drives the base 5 to move so that the upper plane of the base 5 is flush with the upper plane of the lifting platform 4;

[0050] S0.2: Take an appropriate amount of material powder and sprinkle it on the base 5 to fill the positioning groove 5.1;

[0051] S0.3: The finishing roller 2.3 moves back and forth two or three times to remove the powder overflowing from the positioning groove 5.1 on the base 5;

[0052] S0.4: sintering the powder in the positioning groove 5.1;

[0053] S0.5: judging the sintering alignment accuracy of the laser 1 and the accuracy of the sintering thickness according to the sintering state of the powder in the positioning groove 5.1;

[0054] S1: Raise the lifting platform 4 to the highest height, so that the upper end surface of the base 5 and the upper end surface of the lifting platform 4 form a distance of a sintering thickness;

[0055] S2: Add material powder to be laser sintered into the material chamber 3, and the height of the powder is the same as the upper plane of the lifting platform 4;

[0056] S3: the lifting platform 4 is lowered so that the powder covers the lifting platform 4;

[0057] S4: Start the vibrating rod 6 to compact the powder in the lifting platform 4 and eliminate the gaps in the powder;

[0058] S5: The vibrating rod 6 keeps vibrating, and the lifting platform 4 rises to the highest height, at which time the lifting platform 4 abuts against the lower end of the finishing drum 2.3;

[0059] S6: turn off the vibrator 6;

[0060] S7: The finishing roller 2.3 moves back and forth two or three times to remove the powder on the upper surface of the lifting platform 4 that exceeds the lifting platform;

[0061] S8: driving the laser 1 along a specified path to sinter a specified structure on the base 5;

[0062] S9: After the layer structure is sintered and cooled, the finishing roller 2.3 moves back and forth two or three times to remove the powder adhering to the upper end surface of the sintered structure during the sintering process;

[0063] S10: The moving seat 9 moves the base 5 downward by one sintering thickness layer, and the steps S1-S9 are repeated until the product is sintered and formed.

[0064] After the product is completed, it is separated from the base and then finely processed.

[0065] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A laser additive manufacturing device, characterized in that: The invention comprises a forming component for placing manufacturing materials, a laser (1) for sintering the materials, and a finishing component (2) for evenly distributing the powder materials in the forming component. The forming component comprises a material chamber (3) for accommodating materials. A lifting platform (4) is provided in the material chamber (3). A base (5) for placing products is provided on the lifting platform (4). The height of the materials in the material chamber (3) is not lower than the lowest height of the lifting platform (4), and the highest height of the lifting platform (4) is equal to the laser sintering height. A vibrating rod (6) is provided in the material chamber (3). A plurality of vibrating rods (6) are provided. The plurality of vibrating rods (6) are evenly distributed in an array along the circumference of the lifting platform (4). The vibrating rod (6) vibrates in a high-frequency vibration manner.

2. A laser additive manufacturing device according to claim 1, characterized in that: The lifting platform (4) is provided with a placement groove (4.1) for placing the base (5); the placement groove (4.1) is composed of a moving seat (9) sealed and movably connected inside the lifting platform (4) and the inner wall of the lifting platform (4); the base (5) is arranged in the upper center area of ​​the moving seat (9); the depth of the placement groove (4.1) is not less than the height of the base (5), and the placement groove (4.1) is circular.

3. A laser additive manufacturing device according to claim 2, characterized in that: A movable connecting ring (9.1) is provided at the other end of the movable seat (9) away from the base (5), and a movable seat engaging groove (4.6) which is sealingly movable and connected to the movable connecting ring (9.1) is provided in the lifting platform (4).

4. A laser additive manufacturing device according to claim 3, characterized in that: The arranging assembly (2) comprises a transmission screw (2.1) and a guide rod (2.2); a arranging roller (2.3) is provided between the transmission screw (2.1) and the guide rod (2.2); the arranging roller (2.3) abuts against the top surface of the placement groove (4.1); and the length of the arranging roller (2.3) is longer than the maximum diameter of the placement groove (4.1).

5. The laser additive manufacturing device according to claim 2, characterized in that: A guide ring (4.2) is provided on the side of the lifting platform (4) away from the base (5); a connecting outer wall (7) movably connected to the guide ring (4.2) is provided in the material chamber (3); the connecting outer wall (7) is arranged on the outside of the guide ring (4.2); a connecting inner wall (8) movably connected to the guide ring (4.2) is also provided in the material chamber (3); the connecting inner wall (8) is arranged on the inside of the guide ring (4.2); the guide ring (4.2) is sealingly and movably connected between the connecting outer wall (7) and the connecting inner wall (8).

6. The laser additive manufacturing device according to claim 5, characterized in that: The guide ring (4.2) is arranged at the outer edge of the lifting platform (4), and the inner side of the guide ring (4.2) is provided with a lifting platform engaging groove (4.2.1) engaged with the connecting inner wall (8).

7. The laser additive manufacturing device according to claim 1, characterized in that: The lifting platform (4) is provided with a plurality of positioning columns (4.3), the base (5) is provided with a plurality of fixing pins (4.4) which cooperate with the positioning columns (4.3) and are used to fix the base (5) on the lifting platform (4), the fixing pins (4.4) are arranged on the side of the base (5), and the positioning columns (4.3) are provided with fixing holes (4.5) which cooperate with the fixing pins (4.4).

8. The laser additive manufacturing device according to claim 1, characterized in that: The base (5) is provided with a positioning groove (5.1), and the depth of the positioning groove (5.1) is equal to the sintering thickness.

9. A production process of a laser additive manufacturing device, characterized in that: The production operation of the laser additive manufacturing device according to any one of claims 1 to 8 comprises the following steps: S1: Raise the lifting platform (4) to the highest height, so that the upper end surface of the base (5) and the upper end surface of the lifting platform (4) form a distance of a sintering thickness; S2: Adding material powder to be laser sintered into the material chamber (3), with the height of the powder being the same as the upper plane of the lifting platform (4); S3: the lifting platform (4) descends so that the powder covers the lifting platform (4); S4: starting the vibrating rod (6) to compact the powder in the lifting platform (4) and eliminate the gaps in the powder; S5: the vibrating rod (6) keeps vibrating, and the lifting platform (4) rises to the highest height, at which time the lifting platform (4) abuts against the lower end of the finishing roller (2.3); S6: Turn off the vibrator (6); S7: The finishing roller (2.3) moves back and forth two or three times to remove the powder on the upper surface of the lifting platform (4) that exceeds the lifting platform; S8: driving the laser (1) to sinter a specified structure on the base (5) along a specified path; S9: After the layer structure is sintered and cooled, the finishing roller (2.3) moves back and forth two or three times to remove the powder adhering to the upper end surface of the sintered structure during the sintering process; S10: The moving seat (9) moves the base (5) downward by one sintering thickness layer, and repeats the steps S1-S9 until the product is sintered and formed.

10. The production process of a laser additive manufacturing device according to claim 9, characterized in that: Before step S1, the steps include: S0.1: The moving seat (9) drives the base (5) to move so that the upper plane of the base (5) is flush with the upper plane of the lifting platform (4); S0.2: Take an appropriate amount of material powder and sprinkle it on the base (5) to fill the positioning groove (5.1); S0.3: The finishing roller (2.3) moves back and forth two or three times to remove the powder overflowing from the positioning groove (5.1) on the base (5); S0.4: sintering the powder in the positioning groove (5.1); S0.5: According to the sintering state of the powder in the positioning groove (5.1), the sintering alignment accuracy of the laser (1) and the accuracy of the sintering thickness are determined.

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