An integrated SLM apparatus for additive manufacturing production

Abstract

The application discloses an integrated SLM device for additive manufacturing production and belongs to the technical field of SLM devices, which comprises a device shell, a sealing door is slidably installed on the device shell, a negative pressure controller is arranged on one side of the device shell, a laser, a machining table and an electric lifting base plate are respectively arranged in the device shell, a fixed track is arranged on the inner wall of the device shell, 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; mounting racks are symmetrically arranged on the two sides of the preheating box, lifting scrapers are slidably connected between the mounting racks and the preheating box, a micro vibration motor is mounted in the lifting scraper, an electric push rod is arranged on one side of the mounting rack, a connecting plate is arranged at the output end of the electric push rod, the connecting plate is fixedly connected with the lifting scraper, and negative pressure extraction devices are arranged on the sides away from each other of the two groups of lifting scrapers, and the application discloses an SLM device capable of uniformly laying powder and improving the forming quality and mechanical properties of workpieces.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of SLM equipment, and particularly relates to an integrated SLM equipment for additive manufacturing production. BACKGROUND

[0002] SLM, selective laser melting, is a main technical approach in metal material additive manufacturing. The technology selects laser as an energy source, and performs layer-by-layer scanning on a metal powder bed layer according to a planned path in a three-dimensional CAD slice model, so that the scanned metal powder is melted and solidified to achieve a metallurgical bonding effect, and finally a metal part designed by the model is obtained.

[0003] In the prior art, some SLMs are limited by technology and process during production and processing, and some problems need to be solved, which leads to poor workpiece forming quality and mechanical properties during production, such as uneven powder laying and large layer thickness difference during SLM powder laying, which leads to low layer connection strength and poor surface forming quality during SLM printing.

[0004] Therefore, an SLM equipment for additive manufacturing production is needed to meet people's needs. SUMMARY

[0005] In order to overcome the defects of the prior art, the technical problem to be solved by the present application is to provide an SLM equipment which can ensure uniform powder laying and improve workpiece forming quality and mechanical properties.

[0006] To achieve this purpose, the technical scheme adopted by the present application is as follows:

[0007] The present application provides an integrated SLM equipment for additive manufacturing production, which comprises an equipment shell, a sealing door is slidably installed on the equipment shell, a negative pressure controller is arranged on one side of the equipment shell, a laser, a processing table and an electric lifting base plate are arranged in the equipment shell, characterized in that: a fixed track is arranged on the inner wall of the equipment shell, a U-shaped connecting plate is slidably arranged on the fixed track, a preheating box is arranged on one side of the U-shaped connecting plate, so as to realize preheating of the metal powder.

[0008] Two mounting racks are symmetrically arranged on both sides of the preheating box, lifting scrapers are slidably connected between the mounting racks and the preheating box, the bottom ends of the two groups of lifting scrapers are in contact, a micro vibration motor is installed in the lifting scraper, an electric push rod is arranged on one side of the mounting rack, a connecting plate is arranged at the output end of the electric push rod, the connecting plate is fixedly connected with the lifting scraper, and a negative pressure extraction device is arranged on the sides away from each other of the two groups of lifting scrapers, so as to realize cleaning of the metal powder.

[0009] The preferred technical scheme of the present application is that limit sliding grooves are arranged on one side of the two groups of mounting racks close to each other, limit sliding blocks are arranged at two ends of the lifting scraper, and the limit sliding blocks are in sliding connection with the limit sliding grooves.

[0010] The preferred technical scheme of the present application is that the preheating box is connected with a feeding pipe at the top, a plurality of electric heating rods are arranged in the preheating box, the electric heating rod comprises an electric heating wire and an anti-oxidation sheath, the anti-oxidation sheath is fixedly sleeved outside the anti-oxidation electric heating wire, and a flat laying mechanism is arranged in the preheating box.

[0011] The preferred technical scheme of the present application is that the bottom of the lifting scraper is in a right-angled trapezoidal shape and abuts against the slotted bottom of the preheating box, and adjusting grooves are arranged on both sides of the preheating box and abut against the lifting scraper.

[0012] The preferred technical scheme of the present application is that the flat laying mechanism comprises a flat laying motor arranged on the inner wall of the preheating box, the output end of the flat laying motor is connected with a flat laying screw rod, the flat laying screw rod is rotationally connected with the preheating box at the end away from the flat laying motor, a flat laying sliding block in sliding connection with the inner wall of the preheating box is threadedly sleeved on the flat laying screw rod, and a plurality of flat laying shafts are arranged on the bottom of the flat laying sliding block.

[0013] The preferred technical scheme of the present application is that the negative pressure extraction device comprises a negative pressure extraction block arranged on the side of the lifting scraper away from the preheating box, a plurality of shunt pipes are connected with the top of the negative pressure extraction block, a total pipe is connected with the plurality of shunt pipes, an electric regulating valve is arranged at the end of the total pipe away from the shunt pipe, and the electric regulating valve is in electrical signal connection with a negative pressure controller.

[0014] The preferred technical scheme of the present application is that a sliding groove is arranged on one side of the fixed track, a sliding block is in sliding connection with the inside of the sliding groove, a driving screw rod is screwed in the inside of the sliding block, the driving screw rod is rotationally connected with the fixed track, a moving motor is connected with one end of the driving screw rod, and the sliding block is fixedly connected with the U-shaped connecting plate.

[0015] The preferred technical scheme of the present application is that heating strips are fixedly arranged in the processing table and the electric lifting base plate.

[0016] The present application has the following beneficial effects.

[0017] 1. The present application is in the preheating of metal powder, through the feeding pipe to the preheating box for preheating treatment, in the process of conveying under the action of paving motor, the paving screw rod drives the paving sliding block and the bottom of the paving shaft to move, so that the metal powder is evenly laid on the electric heating rod for heating, so as to ensure that the metal powder laid on the processing table and the electric lifting base plate has appropriate initial temperature, at the same time, the metal powder is heated by heating strip, so that the cooling rate of the workpiece can be effectively slowed down after laser forming, so as to reduce the warping deformation and spheroidization of the workpiece, and the purpose of improving the processing quality of the workpiece is realized;

[0018] 2. When laying, the electric push rod drives the lifting scraper on one side to move, and the micro vibration motor in the lifting scraper starts to move, so that the metal powder in the preheating box is overflowed downward from the staggered part at the bottom of the two groups of lifting scrapers through the slot to complete the rapid and uniform powder collecting, and the screw rod drives the preheating box to move through the sliding block under the action of the moving motor, so that the metal powder is evenly laid on the processing table and the electric lifting base plate, which improves the uniformity of metal powder laying, avoids uneven powder laying and large thickness difference between layers during powder laying, reduces the low interlayer connection strength and poor surface forming quality of SLM printing process, and improves the forming quality and mechanical properties of the workpiece;

[0019] 3. When laying, 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, so that the top layer of metal powder is extracted, and the extracted part of the metal powder is transported out through the shunt pipe and the main pipe, so that the powder with serious temperature loss on the top layer is extracted by negative pressure, so that the metal powder always maintains a high temperature, and the harm to human health caused by manual cleaning is reduced, and the flying powder is reduced. DETAILED DESCRIPTION

[0020] Figure 1 is the SLM equipment structure schematic diagram provided in the embodiment of the present application;

[0021] Figure 2 is the SLM equipment internal structure schematic diagram provided in the embodiment of the present application;

[0022] Figure 3 is the processing table structure schematic diagram provided in the embodiment of the present application;

[0023] Figure 4 is the lifting scraper operation structure schematic diagram provided in the embodiment of the present application;

[0024] Figure 5It is the preheating box structure provided in the embodiment of the application.

[0025] Figure 6 It is the negative pressure extraction block structure schematic diagram provided in the embodiment of the application.

[0026] Figure 7 It is the preheating device and paving mechanism structure schematic diagram provided in the embodiment of the application.

[0027] Figure 8 It is the heating strip installation position schematic diagram provided in the embodiment of the application.

[0028] In the drawings, the components represented by each reference numeral are listed as follows:

[0029] 100, device shell; 101, sealing door; 102, laser; 103, machining table; 104, electric lifting base plate; 105, negative pressure controller; 200, fixed rail; 201, U-shaped connecting plate; 202, sliding groove; 203, sliding block; 204, moving motor; 205, driving screw; 300, preheating box; 301, electric heating rod; 302, feeding pipeline; 303, electric heating wire; 304, anti-oxidation sleeve; 305, paving motor; 306, paving screw; 307, paving sliding block; 308, paving shaft; 309, slot; 400, mounting frame; 401, lifting scraper; 402, electric push rod; 403, limiting sliding groove; 404, limiting sliding block; 405, micro vibration motor; 500, negative pressure extraction block; 501, shunt pipe; 502, main pipe; 503, electric regulating valve; 600, heating strip. DETAILED DESCRIPTION

[0030] The technical solutions of the application will be further described below in combination with the drawings and through specific embodiments.

[0031] Referring to the drawings Figures 1-8 An integrated SLM device for additive manufacturing production, comprising a device shell 100, a sealing door 101 is slidably installed on the device shell 100, a negative pressure controller 105 is arranged on one side of the device shell 100, a laser 102, a machining table 103 and an electric lifting base plate 104 are respectively arranged in the device shell 100, characterized in that: a fixed rail 200 is arranged on the inner wall of the device shell 100, a U-shaped connecting plate 201 is slidably arranged on the fixed rail 200, and a preheating box 300 is arranged on one side of the U-shaped connecting plate 201 to realize preheating of metal powder.

[0032] The mounting frame 400 is symmetrically arranged on both sides of the preheating box 300, and the 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; the micro vibration motor 405 is arranged in the lifting scraper 401; the electric push rod 402 is arranged on one side of the mounting frame 400; the connecting plate is arranged at the output end of the electric push rod 402; the connecting plate is fixedly connected with the lifting scraper 401; the negative pressure extraction device is arranged on the sides away from each other of the two groups of lifting scrapers 401, so as to realize the cleaning of the metal powder.

[0033] 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; the adjusting grooves are arranged on both sides of the preheating box 300 and abut against the lifting scrapers 401; and the heating strips 600 are fixedly arranged in the processing table 103 and the electric lifting base plate 104.

[0034] The metal powder is preheated by the preheating box 300, so that the metal powder has a suitable initial temperature when being laid on the surfaces of the processing table 103 and the electric lifting base plate 104; the heating strips 600 are arranged in the processing table 103 and the electric lifting base plate 104, so that the metal powder is heated and kept warm by the heating strips 600, thereby effectively slowing down the cooling speed of the workpiece after laser forming, reducing the warping deformation and spheroidization of the workpiece, and achieving the purpose of improving the processing quality of the workpiece.

[0035] When the metal powder needs to be laid, the output connecting plate of one side of the electric push rod 402 is driven to move upwards, the connecting plate drives the lifting scraper 401 at the corresponding position to move upwards, and the other side of the electric push rod 402 is stationary, so that the lifting scraper 401 on one side moves upwards while the lifting scraper 401 on the other side remains in the original position, and the lifting scrapers 401 on the two sides move in a staggered manner during the movement of the lifting scraper 401 on one side, so that the metal powder overflows from the slot 309 at the bottom of the preheating box 300, thereby realizing the laying of the metal powder; meanwhile, the micro vibration motor 405 in the lifting scraper 401 is started, which further improves the uniformity of the laying of the metal powder, avoids uneven laying of the powder and large thickness difference between layers during the powder laying process, reduces the low interlayer connection strength and poor surface forming quality of SLM printing, and improves the forming quality and mechanical properties of the workpiece.

[0036] According to the size of the metal powder particles, the distance between the two lifting scrapers 401 is controlled to realize the selection of the size of the slot 309 according to the requirements of different metal powder particles, and the application range is wide; by arranging the negative pressure extraction device, the powder with serious temperature loss on the top layer can be extracted by negative pressure, so that the metal powder always maintains a high temperature, and the harm to human health caused by manual cleaning is reduced, and the flying of the powder is reduced.

[0037] Refer to the drawings Figure 6 In 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 manner of the present scheme, preferably, a limiting sliding groove 403 is arranged on one side close to the other limiting sliding groove 403 of the two groups of mounting frames 400, and a limiting sliding block 404 is arranged at both ends of the lifting scraper 401, and the limiting sliding block 404 is in sliding connection with the limiting sliding groove 403, so that the lifting scraper 401 moves up and down along the limiting sliding groove 403 through the limiting sliding block 404 under the action of the electric push rod 402, thereby limiting the moving range of the lifting scraper 401, controlling the size of the groove 309 at the bottom of the preheating box 300, and adapting to the use of metal powder of different particle sizes.

[0038] Refer to the drawings Figure 7 In order to ensure that the metal powder can be fully preheated, as a possible implementation manner of the present scheme, preferably, the preheating box 300 is connected with a feeding pipe 302, a plurality of electric heating rods 301 are arranged in the preheating box 300, the electric heating rod 301 comprises an electric heating wire 303 and an anti-oxidation sleeve 304, the anti-oxidation sleeve 304 is fixedly sleeved outside the anti-oxidation electric heating wire 303, and a paving mechanism is arranged in the preheating box 300.

[0039] When the metal powder enters the preheating box 300 through the feeding pipe 302 and is heated, the electric heating wire 303 in the electric heating rod 301 generates heat, and the anti-oxidation sleeve 304 on the outside can avoid adhesion with the metal powder, so as to affect the moving position of the metal powder. Through cooperation of the electric heating rod 301 and the preheating box 300, the metal powder is preheated, so that the metal powder laid on the surface of the machining table 103 and the electric lifting base plate 104 has a suitable initial temperature, and the quality of subsequent workpiece machining is ensured.

[0040] Refer to the drawings Figure 7 In order to realize uniform heating of the metal powder and improve the efficiency of preheating, as a possible implementation manner of the present scheme, preferably, 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 with a paving lead screw 306, one end of the paving lead screw 306 away from the paving motor 305 is rotatably connected with the preheating box 300, a paving sliding block 307 in sliding connection with the inner wall of the preheating box 300 is threadedly sleeved on the paving lead screw 306, and a plurality of paving shafts 308 are arranged on the bottom of the paving sliding block 307.

[0041] The metal powder is transported to the inside of the preheating box 300 through the feeding channel 302, the paving motor 305 is started, the paving motor 305 drives the paving lead screw 306 to rotate, the paving lead screw 306 drives the paving sliding block 307 to move back and forth along the inner wall of the preheating box, the movable paving sliding block 307 drives the paving week 308 to uniformly lay the metal powder on the electric heating rod 301, so that the metal powder is uniformly heated, the purpose of preheating the metal powder is achieved, and the metal powder laid on the machining table 103 and the electric lifting base plate 104 has a suitable initial temperature.

[0042] Referring to the drawings Figures 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 manner of the present scheme, preferably, the negative pressure extraction device comprises a negative pressure extraction block 500 arranged on the side of the lifting scraper 401 away from the preheating box 300, a plurality of groups of branch pipes 501 are connected to the top of the negative pressure extraction block 500, a total pipe 502 is connected to the plurality of groups of branch pipes 501, an electric regulating valve 503 is installed at the end of the total pipe 502 away from the branch pipe 501, and the electric regulating valve 503 is electrically connected to the negative pressure controller 105.

[0043] When the lifting scraper 401 moves under the action of the electric push rod 402, the negative pressure extraction block 500 is driven to move, the electric regulating valve 503 is controlled by the negative pressure controller 105, different situations are adapted, the top layer of metal powder is extracted by the negative pressure mode, a part of the extracted metal powder is transported out through the branch pipe 501 and the total pipe 502, the negative pressure extraction block 500 sucks the remaining metal powder on the electric lifting base plate 104 after each layer of printing is completed, and the metal powder is stored through the branch pipe 501 and the total pipe 502, so that manual cleaning is avoided to avoid harm to human health and powder flying.

[0044] Referring to the drawings Figure 4 In order to realize the uniformity and thickness consistency of the metal powder laying, as a possible implementation manner of the present scheme, preferably, a sliding groove 202 is formed on one side of the fixed track 200, a sliding block 203 is slidably connected in the sliding groove 202, a driving lead screw 205 is screwed in the sliding block 203, the driving lead screw 205 is rotatably connected with the fixed track 200, a moving motor 204 is connected to one end of the driving lead screw 205, and the sliding block 203 is fixedly connected with the U-shaped connecting plate 201.

[0045] The moving motor 204 is started, the moving motor 204 drives the driving screw rod 205 to rotate, the rotating driving screw rod 205 drives the sliding block 203 to slide along the inner wall of the sliding groove 202, the sliding block 203 drives the fixed U-shaped connecting plate 201 to slide along the fixed track 200, thereby driving the preheating box 300 to move, cooperating 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, and the uniformity and thickness consistency of the laid metal powder are ensured.

[0046] The application is described by preferred embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to the features and embodiments without departing from the spirit and scope of the application. The application is not limited by the specific embodiments disclosed herein, and other embodiments falling within the claims of the application are within the protection scope of the application.

Claims

1. An integrated SLM device for additive manufacturing production, comprising a device housing (100), a sealing door (101) is slidingly installed 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 respectively arranged in the device housing (100), characterized in that: The equipment shell (100) is provided with a fixed track (200) on the inner wall, 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 realize preheating of metal powder. ​ The preheating box (300) is symmetrically provided with a mounting rack (400) on both sides, a lifting scraper (401) is slidably connected between the mounting rack (400) and the preheating box (300), the bottom ends of the two groups of lifting scrapers (401) are in contact, a micro vibration motor (405) is installed in the lifting scraper (401), an electric push rod (402) is arranged on one side of the mounting rack (400), a connecting plate is arranged on the output end of the electric push rod (402), the connecting plate is fixedly connected with the lifting scraper (401), and negative pressure extraction devices are arranged on the sides away from each other of the two groups of lifting scrapers (401) to realize cleaning of the metal powder.

2. The integrated SLM device for additive manufacturing production according to claim 1, characterized in that: The two groups of mounting racks (400) are provided with a limiting sliding groove (403) on the side close to each other, and the lifting scrapers (401) are provided with limiting sliding blocks (404) at both ends, and the limiting sliding blocks (404) are slidably connected with the limiting sliding groove (403).

3. The integrated SLM device for additive manufacturing production according to claim 1, characterized in that: The preheating box (300) is connected with a feeding pipe (302) at the top, a plurality of electric heating rods (301) are installed in the preheating box (300), the electric heating rod (301) comprises an electric heating wire (303) and an anti-oxidation sleeve (304), the anti-oxidation sleeve (304) is fixedly sleeved outside the anti-oxidation electric heating wire (303), and a flat laying mechanism is installed in the preheating box (300).

4. The integrated SLM device for additive manufacturing production according to claim 3, characterized in that: The bottom of the lifting scraper (401) is in a right trapezoidal shape and abuts against a slot (309) at the bottom of the preheating box (300), and adjusting grooves are formed in the two sides of the preheating box (300) and abut against the lifting scraper (401).

5. The integrated SLM device for additive manufacturing production according to claim 3, characterized in that: The flat laying mechanism comprises a flat laying motor (305) arranged on the inner wall of the preheating box (300), the output end of the flat laying motor (305) is connected with a flat laying screw rod (306), one end of the flat laying screw rod (306) away from the flat laying motor (305) is rotationally connected with the preheating box (300), a plurality of flat laying shafts (308) are arranged on the bottom of the flat laying sliding block (307) which is slidably connected with the inner wall of the preheating box (300).

6. The integrated SLM device for additive manufacturing production according to claim 1, characterized in that: 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), a plurality of groups of shunt pipes (501) are connected to the top of the negative pressure extraction block (500), a total pipe (502) is connected to the plurality of groups of shunt pipes (501), an electric regulating valve (503) is installed at the end of the total pipe (502) away from the shunt pipe (501), and the electric regulating valve (503) is electrically connected with the negative pressure controller (105).

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

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

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