Integrated SLM equipment for additive manufacturing production

Abstract

The invention discloses integrated SLM equipment for additive manufacturing production, and belongs to the technical field of SLM equipment, the integrated SLM equipment comprises an equipment shell, a sealing door is slidably mounted on the equipment shell, a negative pressure controller is arranged on one side of the equipment shell, and a laser, a machining table and an electric lifting base plate are arranged in the equipment shell; a fixed rail is arranged on the inner wall of the equipment shell, a U-shaped connecting plate is arranged on the fixed rail in a sliding mode, and a preheating box is arranged on one side of the U-shaped connecting plate. Mounting frames are symmetrically arranged on the two sides of the preheating box, lifting scrapers are slidably connected between the mounting frames and the preheating box, micro vibration motors are mounted in the lifting scrapers, electric push rods are arranged on one sides of the mounting frames, and connecting plates are arranged at the output ends of the electric push rods and fixedly connected with the lifting scrapers. And negative pressure extraction devices are arranged on the sides, away from each other, of the two sets of lifting scrapers. According to the SLM equipment, powder laying is uniform, and the workpiece forming quality and the mechanical performance are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of SLM equipment, and in particular to an integrated SLM equipment for additive manufacturing production. Background Art

[0002] SLM, selective laser melting, is a major technical approach in additive manufacturing of metal materials. This technology uses laser as the energy source and scans the metal powder bed layer by layer according to the path planned in the 3D CAD slice model. The scanned metal powder is melted and solidified to achieve the effect of metallurgical bonding, and finally the metal parts designed by the model are obtained.

[0003] In the existing technology, some SLMs are limited by technology and processes during production and processing, and there are some problems that need to be solved urgently, which leads to poor workpiece molding quality and mechanical properties during production. For example, in the SLM powder laying process, the powder is unevenly laid and the thickness difference between layers is large, resulting in low interlayer connection strength and poor surface forming quality during the SLM printing process.

[0004] Therefore, an SLM device for additive manufacturing production is needed to meet people's needs. Summary of the invention

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present invention is to provide an SLM device that ensures uniform powder laying and improves the molding quality and mechanical properties of the workpiece.

[0006] To achieve this object, the present invention adopts the following technical solutions: The present invention provides an integrated SLM device for additive manufacturing production, comprising a device housing, a sealing door is slidably mounted on the device housing, a negative pressure controller is arranged on one side of the device housing, a laser, a processing table and an electric lifting base plate are arranged inside the device housing, and the device is characterized in that: a fixed track is arranged on the inner wall of the device housing, a U-shaped connecting plate is slidably arranged on the fixed track, and a preheating box is arranged on one side of the U-shaped connecting plate to achieve preheating of metal powder; Mounting frames are symmetrically arranged on both sides of the preheating box, a lifting scraper is slidably connected between the mounting frame and the preheating box, the bottom ends of the two groups of lifting scrapers are in contact, a micro vibration motor is installed inside the lifting scraper, an electric push rod is arranged on one side of the mounting frame, a connecting plate is arranged on the output end of the electric push rod, the connecting plate is fixedly connected to the lifting scraper, and a negative pressure extraction device is arranged on the side where the two groups of lifting scrapers are away from each other to realize the cleaning of metal powder.

[0007] The preferred technical solution of the present invention is that a limiting slide groove is provided on one side of the two groups of mounting frames close to each other, and limiting sliders are provided at both ends of the lifting scraper, and the limiting sliders are slidably connected to the limiting slide groove.

[0008] The preferred technical solution of the present invention is that a feed pipe is connected to the top of the preheating box, a plurality of groups of electric heating rods are installed inside the preheating box, the electric heating rods include heating wires and anti-oxidation jackets, the anti-oxidation jackets are fixedly sleeved on the outside of the anti-oxidation heating wires, and a paving mechanism is installed inside the preheating box.

[0009] The preferred technical solution of the present invention is that the bottom of the lifting scraper is in a right-angle trapezoidal shape and abuts against the slot at the bottom of the preheating box, and adjustment slots abutting against the lifting scraper are provided on both sides of the preheating box.

[0010] The preferred technical solution of the present invention is that the flattening mechanism includes a flattening motor arranged on the inner wall of the preheating box, the output end of the flattening motor is connected to a flattening screw, the flattening screw is rotatably connected to the preheating box at one end away from the flattening motor, a flattening slider slidably connected to the inner wall of the preheating box is threadedly sleeved on the flattening screw, and a plurality of groups of flattening shafts are arranged at the bottom of the flattening slider.

[0011] The preferred technical solution of the present invention is that the negative pressure extraction device includes a negative pressure extraction block arranged on the side of the lifting scraper away from the preheating box, and multiple groups of shunt pipes are connected to the top of the negative pressure extraction block, and the multiple groups of shunt pipes are connected to the main pipe, and an electric regulating valve is installed at one end of the main pipe away from the shunt pipe, and the electric regulating valve is electrically connected to the negative pressure controller.

[0012] The preferred technical solution of the present invention is that a slide groove is opened on one side of the fixed track, a slider is slidably connected inside the slide groove, a driving screw is threaded inside the slider, the driving screw is rotatably connected to the fixed track, one end of the driving screw is connected to a moving motor, and the slider is fixedly connected to the U-shaped connecting plate.

[0013] A preferred technical solution of the present invention is that heating strips are fixedly installed in both the processing table and the electric lifting base plate.

[0014] The beneficial effects of the present invention are: 1. When preheating metal powder, the present invention conveys the metal powder to the preheating box through the feeding pipe for preheating treatment. During the conveying process, under the action of the paving motor, the paving screw drives the paving slider and the bottom paving shaft to move, so that the metal powder is evenly spread on the electric heating rod for heating, thereby ensuring that the metal powder laid on the processing table and the electric lifting base plate has a suitable initial temperature. At the same time, the metal powder is heated and kept warm by the heating strip, so that the metal powder can effectively slow down the cooling speed of the workpiece after laser forming, thereby reducing the warping deformation and spheroidization of the workpiece, and achieving the purpose of improving the processing quality of the workpiece; 2. During the laying process, the electric push rod drives the lifting scraper on one side to move, and at the same time, the micro-vibration motor in the lifting scraper is started. As the lifting scraper on one side moves, the lifting scraper on the other side remains stationary, so that the metal powder inside the preheating box overflows downward from the offset at the bottom of the two groups of lifting scrapers through the slots, so as to complete the rapid and uniform powder application. At the same time, under the action of the moving motor, the driving screw drives the preheating box to move through the slider, so that the metal powder is evenly laid on the processing table and the electric lifting base plate, thereby improving the uniformity of the metal powder laying, avoiding uneven powder laying and large thickness difference between layers during the powder laying process, resulting in low interlayer connection strength and poor surface forming quality during the SLM printing process, and improving the forming quality and mechanical properties of the workpiece; 3. When the present invention is paving, the lifting scraper moves under the action of the electric push rod, driving the negative pressure extraction block to move, and the electric regulating valve 503 is adjusted by the negative pressure controller to extract the metal powder on the top layer. A part of the extracted metal powder is transported out through the shunt pipe and the main pipe, and the powder with severe temperature loss on the top layer is extracted by negative pressure, so that the metal powder is always kept at a high temperature. At the same time, it can reduce the harm to human health due to manual cleaning and reduce powder flying. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the structure of an SLM device provided in a specific embodiment of the present invention; Figure 2 is a schematic diagram of the internal structure of an SLM device provided in a specific embodiment of the present invention; Figure 3 It is a schematic diagram of the structure of a processing table provided in a specific embodiment of the present invention; Figure 4 It is a schematic diagram of the operation structure of the lifting scraper provided in a specific embodiment of the present invention; Figure 5 is a cross-sectional view of the preheating box structure provided in a specific embodiment of the present invention; Figure 6 It is a schematic diagram of the structure of the negative pressure extraction block provided in a specific embodiment of the present invention; Figure 7 It is a schematic diagram of the structure of the preheating device and the flattening mechanism provided in a specific embodiment of the present invention; Figure 8 It is a schematic diagram of the installation position of the heating strip provided in a specific embodiment of the present invention.

[0016] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 100, equipment housing; 101, sealing door; 102, laser; 103, processing table; 104, electric lifting base plate; 105, negative pressure controller; 200, fixed track; 201, U-shaped connecting plate; 202, slide; 203, slider; 204, mobile motor; 205, driving screw; 300, preheating box; 301, electric heating rod; 302, feeding pipe; 303, electric heating wire; 304, anti- Oxidation jacket; 305, paving motor; 306, paving screw rod; 307, paving slider; 308, paving shaft; 309, slotting; 400, mounting frame; 401, lifting scraper; 402, electric push rod; 403, limit slide; 404, limit slider; 405, micro vibration motor; 500, negative pressure extraction block; 501, shunt pipe; 502, main pipe; 503, electric regulating valve; 600, heating strip. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0018] See attached Figure 1-8 , an integrated SLM device for additive manufacturing production, comprising a device housing 100, a sealing door 101 is slidably mounted on the device housing 100, a negative pressure controller 105 is arranged on one side of the device housing 100, a laser 102, a processing table 103 and an electric lifting base plate 104 are arranged inside the device housing 100, characterized in that: a fixed track 200 is arranged on the inner wall of the device housing 100, a U-shaped connecting plate 201 is slidably arranged on the fixed track 200, and a preheating box 300 is arranged on one side of the U-shaped connecting plate 201 to achieve preheating of metal powder; The mounting frames 400 are symmetrically arranged on both sides of the preheating box 300, and a lifting scraper 401 is slidably connected between the mounting frames 400 and the preheating box 300, and the bottom ends of the two groups of lifting scrapers 401 are in contact with each other, and a micro vibration motor 405 is installed inside the lifting scraper 401. An electric push rod 402 is arranged on one side of the mounting frame 400, and a connecting plate is arranged on the output end of the electric push rod 402, and the connecting plate is fixedly connected to the lifting scraper 401. A negative pressure extraction device is arranged on the side where the two groups of lifting scrapers 401 are away from each other to realize the cleaning of metal powder; The bottom of the lifting scraper 401 is in a right-angled trapezoidal shape and abuts against the slot 309 at the bottom of the preheating box 300. Adjustment slots abutting against the lifting scraper 401 are provided on both sides of the preheating box 300. Heating strips 600 are fixedly installed in the processing table 103 and the electric lifting base plate 104.

[0019] The metal powder is preheated by the preheating box 300 to ensure that the metal powder has a suitable initial temperature when laid on the surface of the processing table 103 and the electric lifting base plate 104. At the same time, heating bars 600 are arranged in the processing table 103 and the electric lifting base plate 104. The metal powder is heated and kept warm by the heating bars 600, so that the metal powder can effectively slow down the cooling speed of the workpiece after laser forming, thereby reducing the warping deformation and spheroidization of the workpiece, and achieving the purpose of improving the processing quality of the workpiece; When it is necessary to lay metal powder, the output end of the electric push rod 402 on one side drives the connecting plate to move upward, and the connecting plate drives the lifting scraper 401 at the corresponding position to move upward, while the electric push rod 402 on the other side is stationary, so that the lifting scraper 401 on one side moves upward while the lifting scraper 401 on the other side remains in the original position. During the movement of the lifting scraper 401 on one side, the lifting scraper 401 on the other side moves displaced relative to each other, so that the metal powder overflows downward from the slot 309 at the bottom of the preheating box 300, thereby achieving the laying of the metal powder. At the same time, the micro vibration motor 405 inside the lifting scraper 401 is started, which further improves the uniformity of the metal powder laying, avoids uneven powder laying and large thickness difference between layers during the powder laying process, resulting in low interlayer connection strength and poor surface forming quality during the SLM printing process, and improves the forming quality and mechanical properties of the workpiece; According to the size of the metal powder particles, the spacing of the offset movement between the lifting scrapers 401 on both sides is controlled to achieve the selection of the size of the slot 309 discharge according to the requirements of different metal powder particles, and has a wide range of applications; by setting up a negative pressure extraction device, the powder with severe temperature loss on the top layer can be extracted by negative pressure, so that the metal powder can always maintain a high temperature, and at the same time, it can reduce the harm to human health due to manual cleaning and reduce powder flying.

[0020] See attached Figure 6In order to limit the moving range of the lifting scraper 401 and ensure the stability of the lifting process of the lifting scraper 401, as a possible implementation method of this scheme, preferably, the two groups of the mounting frames 400 are close to each other and a limiting slide groove 403 is opened on one side, and limiting sliders 404 are set at both ends of the lifting scraper 401. The limiting sliders 404 are slidably connected with the limiting slide groove 403, so that the lifting scraper 401 moves up and down along the limiting slide groove 403 through the limiting slider 404 under the action of the electric push rod 402, thereby limiting the moving range of the lifting scraper 401, so as to control the opening size of the slot 309 at the bottom of the preheating box 300 to adapt to the use of metal powders with different particle sizes.

[0021] See attached Figure 7 In order to ensure that the metal powder is fully preheated, as a possible implementation method of the present scheme, preferably, the top plate of the preheating box 300 is connected to a feed pipe 302, and a plurality of groups of electric heating rods 301 are installed inside the preheating box 300. The electric heating rods 301 include electric heating wires 303 and anti-oxidation jackets 304. The anti-oxidation jackets 304 are fixedly sleeved on the outside of the anti-oxidation electric heating wires 303, and a paving mechanism is installed inside the preheating box 300.

[0022] The metal powder enters the preheating box 300 through the feed pipe 302. When heated, the electric heating wire 303 inside the electric heating rod 301 generates heat, and the external anti-oxidation jacket 304 can avoid adhesion with the metal powder, thereby affecting the movement position of the metal powder. The electric heating rod 301 cooperates with the preheating box 300 to preheat the metal powder, ensuring that the metal powder laid on the surface of the processing table 103 and the electric lifting base plate 104 has a suitable initial temperature to ensure the quality of subsequent workpiece processing.

[0023] See attached Figure 7 In order to achieve uniform heating of metal powder and improve the efficiency of preheating, as a possible implementation method of the present scheme, preferably, the flattening mechanism includes a flattening motor 305 arranged on the inner wall of the preheating box 300, and the output end of the flattening motor 305 is connected to a flattening screw 306, and the flattening screw 306 is rotatably connected to the preheating box 300 at one end away from the flattening motor 305, and a flattening slider 307 slidably connected to the inner wall of the preheating box 300 is threadedly sleeved on the flattening screw 306, and a plurality of groups of flattening shafts 308 are arranged at the bottom of the flattening slider 307.

[0024] The metal powder is conveyed to the interior of the preheating box 300 through the feed channel 302, and the paving motor 305 is started. The paving motor 305 drives the paving screw 306 to rotate, and the paving screw 306 drives the paving slider 307 to move back and forth along the inner wall of the preheating box. The movable paving slider 307 drives the paving circle 308 to evenly spread the metal powder on the electric heating rod 301, so that the metal powder is evenly heated, achieving the purpose of preheating the metal powder, so that the metal powder laid on the processing table 103 and the electric lifting base plate 104 has a suitable initial temperature.

[0025] See attached Figure 3-4 In order to ensure that the temperature of the metal powder meets the workpiece operation requirements and the subsequent cleaning of the metal powder, as a possible implementation method of this scheme, preferably, the negative pressure extraction device includes a negative pressure extraction block 500 arranged on the side of the lifting scraper 401 away from the preheating box 300, and the top of the negative pressure extraction block 500 is connected to a plurality of groups of shunt pipes 501, and the plurality of groups of shunt pipes 501 are connected to a main pipe 502, and the main pipe 502 is installed with an electric regulating valve 503 at one end away from the shunt pipe 501, and the electric regulating valve 503 is electrically connected to the negative pressure controller 105.

[0026] When the lifting scraper 401 moves under the action of the electric push rod 402, it drives the negative pressure extraction block 500 to move, and controls the electric regulating valve 503 through the negative pressure controller 105 to adapt to the needs of different situations. The metal powder on the top layer is extracted by negative pressure, and a part of the extracted metal powder is transported out through the shunt pipe 501 and the main pipe 502. After each layer of printing is completed, the negative pressure extraction block 500 absorbs the remaining metal powder on the electric lifting substrate 104 and stores it through the shunt pipe 501 and the main pipe 502, avoiding the harm to human health and powder flying caused by manual cleaning.

[0027] See attached Figure 4 In order to achieve uniformity and thickness of metal powder laying, as a possible implementation method of the present scheme, preferably, a slide groove 202 is opened on one side of the fixed rail 200, and a slider 203 is slidably connected inside the slide groove 202. A driving screw rod 205 is screwed inside the slider 203, and the driving screw rod 205 is rotatably connected to the fixed rail 200. One end of the driving screw rod 205 is connected to a moving motor 204, and the slider 203 is fixedly connected to the U-shaped connecting plate 201.

[0028] The moving motor 204 is started, and the moving motor 204 drives the driving screw 205 to rotate. The rotating driving screw 205 drives the slider 203 to slide along the inner wall of the slide groove 202. The slider 203 drives the U-shaped connecting plate 201 fixed thereto to slide along the fixed track 200, thereby driving the preheating box 300 to move. With the action of the lifting scraper 401, the metal powder is evenly laid on the processing table 103 and the electric lifting base plate 104, ensuring the uniformity of the metal powder laying and the consistency of thickness.

[0029] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. An integrated SLM device for additive manufacturing production, comprising a device housing (100), a sealing door (101) being slidably mounted on the device housing (100), a negative pressure controller (105) being arranged on one side of the device housing (100), a laser (102), a processing table (103) and an electric lifting base plate (104) being arranged inside the device housing (100), characterized in that: A fixed track (200) is arranged on the inner wall of the device housing (100), a U-shaped connecting plate (201) is slidably arranged on the fixed track (200), and a preheating box (300) is arranged on one side of the U-shaped connecting plate (201) to achieve preheating of metal powder; Mounting frames (400) are symmetrically arranged on both sides of the preheating box (300), and a lifting scraper (401) is slidably connected between the mounting frame (400) and the preheating box (300), the bottom ends of the two groups of lifting scrapers (401) are in contact with each other, and a micro vibration motor (405) is installed inside the lifting scraper (401), and an electric push rod (402) is arranged on one side of the mounting frame (400), and a connecting plate is arranged at the output end of the electric push rod (402), and the connecting plate is fixedly connected to the lifting scraper (401), and a negative pressure extraction device is arranged on the side of the two groups of lifting scrapers (401) away from each other to achieve the cleaning of metal powder.

2. The integrated SLM device for additive manufacturing according to claim 1, characterized in that: A limiting slide groove (403) is provided on one side of the two groups of mounting frames (400) close to each other, and limiting sliders (404) are provided at both ends of the lifting scraper (401), and the limiting sliders (404) are slidably connected to the limiting slide groove (403).

3. The integrated SLM device for additive manufacturing according to claim 1, characterized in that: The top of the preheating box (300) is connected to a feed pipe (302), and a plurality of groups of electric heating rods (301) are installed inside the preheating box (300). The electric heating rods (301) include electric heating wires (303) and anti-oxidation jackets (304), and the anti-oxidation jackets (304) are fixedly sleeved on the outside of the anti-oxidation electric heating wires (303). A paving mechanism is installed inside the preheating box (300).

4. The integrated SLM device for additive manufacturing according to claim 3, characterized in that: The bottom of the lifting scraper (401) is in the shape of a right-angled trapezoid and abuts against the slot (309) at the bottom of the preheating box (300). Adjustment slots abutting against the lifting scraper (401) are provided on both sides of the preheating box (300).

5. The integrated SLM device for additive manufacturing according to claim 3, characterized in that: The paving mechanism comprises a paving motor (305) arranged on the inner wall of the preheating box (300); the output end of the paving motor (305) is connected to a paving screw rod (306); one end of the paving screw rod (306) away from the paving motor (305) is rotatably connected to the preheating box (300); a paving slider (307) slidably connected to the inner wall of the preheating box (300) is threadedly sleeved on the paving screw rod (306); and a plurality of groups of paving shafts (308) are arranged at the bottom of the paving slider (307).

6. The integrated SLM device for additive manufacturing according to claim 1, characterized in that: The negative pressure extraction device comprises a negative pressure extraction block (500) arranged on a side of the lifting scraper (401) away from the preheating box (300), the top of the negative pressure extraction block (500) is connected to a plurality of groups of shunt pipes (501), the plurality of groups of shunt pipes (501) are connected to a main pipe (502), an electric regulating valve (503) is installed at one end of the main pipe (502) away from the shunt pipes (501), and the electric regulating valve (503) is electrically connected to the negative pressure controller (105).

7. The integrated SLM device for additive manufacturing according to claim 1, characterized in that: A slide groove (202) is provided on one side of the fixed track (200), a slider (203) is slidably connected inside the slide groove (202), a driving screw rod (205) is screwed inside the slider (203), the driving screw rod (205) is rotatably connected to the fixed track (200), one end of the driving screw rod (205) is connected to a moving motor (204), and the slider (203) is fixedly connected to the U-shaped connecting plate (201).

8. The integrated SLM device for additive manufacturing according to claim 1, characterized in that: A heating strip (600) is fixedly installed in both the processing table (103) and the electric lifting base plate (104).

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