WO2021056693A1

WO2021056693A1 - Continuous and cyclic powder spreading structure and additive manufacturing forming apparatus

Info

Publication number: WO2021056693A1
Application number: PCT/CN2019/115794
Authority: WO
Inventors: 卢秉恒; 陈祯; 邹亚桐; 张树哲; 赵纪元; 韦继翀; 刘亮; 魏培
Original assignee: 西安增材制造国家研究院有限公司
Priority date: 2019-09-29
Filing date: 2019-11-05
Publication date: 2021-04-01
Also published as: CN110560689A; CN110560689B

Abstract

Disclosed are a continuous and cyclic powder spreading structure and an additive manufacturing forming apparatus. Side plates (25) and a top plate (26) are arranged on a platen (24), a printing forming cavity is formed by the platen (24) and a cylinder body (30) arranged at the lower end thereof, and the continuous and cyclic powder spreading structure is arranged in the printing forming cavity in order to realize continuous powder spreading during the printing forming process. A printing substrate (31) moves up and down in the cylinder body (30) by means of a driving device, and a printing face on the printing substrate (31) is then printed and formed by means of a light path scanning structure configured at the upper end in the printing forming cavity. Through holes are formed in the middle of a gear bearing and the middle of the platen (24), such that the light path scanning structure conveniently forms, by means of a laser, the printing face on the printing substrate (31) at the lower end of the platen (24). The light path scanning structure is located at the upper end of the continuous and cyclic powder spreading structure and can work together with a powder spreading scraper (16) to conduct powder spreading and scanning forming, such that the high-efficiency printing process of simultaneous powder spreading and scanning can be achieved, thereby improving the efficiency of forming parts. At the same time, the printing substrate (31) moves up and down in the cylinder body (30), thereby limiting a forming area and increasing the powder utilization rate.

Description

Continuous circulating powder spreading structure and additive manufacturing forming equipment

Technical field

The invention belongs to the field of additive manufacturing equipment, and in particular relates to a continuous circulating powder spreading structure and additive manufacturing forming equipment.

Background technique

Additive manufacturing technology integrates multidisciplinary technologies such as new materials, information and manufacturing, and is known as a representative technology that is expected to produce the "third industrial revolution", and is the leading technology for the development of mass manufacturing models to personalized manufacturing models. As the most cutting-edge and most potential technology in the entire additive manufacturing system, metal additive manufacturing technology is an important development direction of advanced manufacturing technology. It is suitable for near-net forming of complex components. The formed parts manufactured by additive manufacturing technology have excellent mechanical properties, are suitable for rapid forming of various materials, and have high material utilization.

Selective Laser Melting (SLM) technology is a typical example of additive manufacturing. It transforms the traditional three-dimensional manufacturing process into a planar manufacturing-cumulative stacking process, and realizes the integration of three-dimensional complex precision parts through powder layer-by-layer melting. Manufacturing, suitable for the manufacture of almost any complex shape metal parts. At the same time, the spot diameter used in SLM forming is small and the forming accuracy is high. It can directly form complex thin-walled components with heterogeneous runners. The minimum wall thickness can reach 100μm. The performance of the formed parts can reach the level of forgings with the same composition, and the accuracy is much higher than that of precision casting. Craft. Therefore, the technology has been widely used in aerospace, medical, mold, automotive and other fields, and is considered to be one of the fastest growing and most promising metal additive manufacturing technologies in recent years. At present, the additive manufacturing equipment adopts the method of intermittent powder spreading and forming on the whole width. Due to the interference caused by the simultaneous spreading and scanning, the powder spreading process and the scanning and printing process cannot be carried out at the same time, and the powder spreading coverage is much larger than the forming area. , The powder spreading time is long and the material utilization rate is low, which seriously affects the forming efficiency of the parts.

Summary of the invention

The purpose of the present invention is to provide a continuous circulating powder spreading structure and additive manufacturing forming equipment to overcome the defects that the existing equipment can not perform powder spreading and scanning, and realize the simultaneous powder spreading and scanning in the SLM forming process, that is, simultaneous powder spreading. High-efficiency printing process of edge scanning.

In order to achieve the above objective, the present invention adopts the following technical solutions:

A continuous circulating powder spreading structure, which includes a powder spreading blade, a gear bearing and a platen. Both the gear bearing and the platen are provided with a formed through hole. The gear bearing includes an outer ring and an outer ring nested in the outer ring and capable of rotating relative to the outer ring. The inner ring and the inner ring are fixed on the upper end of the platen, the powder spreading blade is fixed on the upper end of the outer ring, the outer ring is provided with transmission teeth in the circumferential direction, the lower end of the plate forming through hole is provided with a printing substrate for forming parts, and the powder spreading blade is provided with a buffer at the upper end The powder silo, the buffer powder silo is equipped with a deflector arranged obliquely along the length of the powder spreading scraper. There are a plurality of deflecting holes on the deflector, the lower end of the deflector is provided with a deflector, and the upper end of the deflector is The inclined surface is arranged along the width direction of the powder spreading scraper, and the lower end of the powder spreading scraper is provided with a powder spreading groove at the lower end of the inclined surface of the guide block, and the powder spreading groove is arranged along the length direction of the powder spreading scraper.

Further, the powder spreading scraper is arranged along the diameter of the outer ring, and the center point of the powder spreading scraper coincides with the center of the outer ring. Two symmetrically arranged two deflectors are provided in the buffer powder bin at the upper end of the powder spreading scraper. The near end of the plate is lower than the other end of the two baffles.

Further, the powder spreading scraper is fixed on the outer ring through a scraper bracket, and the scraper support is provided with a connection through hole fixedly connected to the outer ring by countersunk bolts, and the scraper support and the powder spreading scraper are connected or welded by bolts.

Further, a scraper body is fixed at the lower end of the powder spreading scraper through a scraper clamping plate.

Further, it also includes a powder feeding device. The powder feeding device includes a powder bin and a powder feeding box body arranged at the lower end of the powder bin. The powder feeding box is provided with a powder feeding roller. The powder feeding roller is driven by the powder feeding motor. The powder feeding box body is provided with a powder feeding trough, the lower end of the powder feeding box body is provided with a funnel for drainage, the funnel inlet is connected with the powder feeding box body outlet, and the funnel outlet is located at the upper end of the powder spreading scraper.

An additive manufacturing forming device based on a continuous circulating powder spreading structure, including a Z-axis transmission assembly, a gas circulating dust removal structure and an optical path scanning structure,

The Z-axis transmission assembly includes a cylinder body and a driving device for driving the printing substrate to move up and down in the cylinder body. The platen is fixed on the upper end of the cylinder body. The formed through hole of the platen is arranged coaxially with the cylinder body. The upper end of the platen is provided with a side The plate and the top plate, the platen, the side plate, the top plate and the cylinder block form the printing forming cavity. The platen is fixed with a powder spreading driving motor for driving the rotation of the outer ring; the gas circulation dust removal structure is used to replace the gas in the printing forming cavity and remove dust ; The optical path scanning structure is arranged in the printing forming cavity for printing and forming the printing surface on the printing substrate.

Further, the table is provided with a gas inlet and a gas outlet; the gas circulating dust removal structure includes a separator, a dust filter element and a circulating fan. The gas inlet of the separator is connected to the gas outlet of the table, and the gas outlet of the separator is connected to the gas of the dust removal filter element. The inlet is connected, and the gas outlet of the circulating fan is connected to the gas inlet of the table.

Further, the optical path scanning structure is arranged on the top plate, and the optical path scanning structure includes a laser, a galvanometer, a dynamic focus mirror, and a collimating beam expander. After the laser beam is emitted from the laser, it passes through the optical fiber and sequentially passes through the collimating beam expander, Dynamic focusing mirror and galvanometer, the galvanometer will shoot the final shaped laser beam to the printing surface.

Further, the driving device of the Z-axis transmission assembly includes a piston assembly arranged in the cylinder. The piston assembly includes a heating plate, a heat insulation plate, a sealing plate, a water-cooling plate and a lead screw arranged in order from top to bottom, and the printing substrate is arranged on The top of the heating plate.

Further, the powder spreading driving motor meshes with the outer gear of the outer ring through the driving gear.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention is a continuous circulating powder spreading structure. Through the structural design of powder spreading blade, gear bearing and platen, a formed through hole is arranged between the gear bearing and the platen, and the outer ring and the nested inside the outer ring can be relatively outside. The gear bearing structure composed of the rotating inner ring fixes the inner ring to the upper end of the platen. The lower end of the platen forming through hole is provided with a printing substrate for forming parts to form a powder spreading channel, and then the powder spreading blade is fixed to the outer ring At the upper end, there are transmission teeth on the outer circumference of the outer ring. The outer ring is used to drive the powder spreader to rotate to form a rotating powder spreading structure. A buffer powder bin is provided at the upper end of the powder spreader. The deflector is provided with a plurality of deflector holes to guide the powder material to be evenly distributed on the deflector block inside the powder spreading scraper, and then the deflector block is introduced into the powder spreading tank for powder spreading, and then powder spreading The lower end of the squeegee is spreading and leveling, so as to realize continuous spreading of powder on the printing substrate and improve the spreading efficiency. The device has a simple structure and convenient operation.

Further, the powder spreading scraper is arranged along the diameter of the outer ring, and the center point of the powder spreading scraper coincides with the center of the outer ring. Two symmetrically arranged two deflectors are provided in the buffer powder bin at the upper end of the powder spreading scraper. The plate is close to one end and lower than the other end of the two baffles to improve the powder spreading efficiency.

Further, the powder spreading blade is fixed on the outer ring through a blade support, and the blade support is provided with a connection through hole fixedly connected to the outer ring by countersunk bolts, and the blade support and the powder spreading blade are connected or welded by bolts, which is convenient for the powder spreading blade. Repair and replacement.

The present invention is an additive manufacturing forming device based on a continuous circulating powder spreading structure. By arranging side plates and a top plate on a platen, the platen and a cylinder arranged at the lower end thereof form a printing forming cavity, and the continuous circulating powder spreading structure is arranged on In the printing forming cavity, the continuous powder spreading of the printing forming process is realized. The driving device is used to realize the up and down movement of the printing substrate in the cylinder, and then the light path scanning structure arranged in the upper end of the printing forming cavity is used to print and shape the printing surface on the printing substrate. , Through holes are formed between the gear bearing and the platen, which is convenient for the laser of the optical path scanning structure to form the printing surface on the printing substrate at the lower end of the platen. The optical path scanning structure is located at the upper end of the continuous circulating powder spreading structure, which can work simultaneously with the powder spreading squeegee. Powder and scanning forming can realize the high-efficiency printing process of powder spreading and scanning, which improves the forming efficiency of parts. At the same time, the printing substrate moves up and down in the cylinder, which limits the forming area and improves the powder utilization rate.

Further, the platen and the cylinder arranged at the lower end thereof form a printing forming cavity, and the platen is provided with a gas inlet and a gas outlet, and the gas circulation dust removal structure is used to perform inert gas replacement to ensure the printing effect.

Description of the drawings

Figure 1 is a schematic diagram of the structure of an additive manufacturing forming device.

Figure 2 is a schematic diagram of the powder spreading structure.

Figure 3 is a front view of the powder spreading forming structure.

Figure 4 is an enlarged schematic diagram of the powder spreading structure.

Figure 5 is a cross-sectional view of the powder spreading blade.

Figure 6 is a longitudinal cross-sectional view of the powder spreading blade.

Among them, 1, main frame, 2, forming cavity components, 3, Z-axis transmission components, 4, separator, 5, dust filter element, 6, circulating fan, 7, electrical cabinet, 8, laser, 9, industrial computer, 11 , Gear bearing, 12, outer ring, 13, inner ring, 14, drive gear, 15, spread powder drive motor, 16, spread powder scraper, 17, scraper bracket, 18, funnel, 19, deflector, 20, send Powder roller, 21, powder feeding box body, 22, powder feeding motor, 23, powder bin, 24, platen, 25, side plate, 26, top plate, 27, galvanometer, 28, dynamic focus lens, 29, collimation Beam expander, 30, cylinder, 31, printing substrate, 32, heating plate, 33, heat insulation plate, 34, sealing plate, 35, water cooling plate, 36, screw, 37, gas inlet, 38, gas outlet, 39. Diversion block, 40, scraper splint, 41, powder spreading tank, 42, diversion hole.

detailed description

The present invention will be further described in detail below in conjunction with the accompanying drawings:

As shown in Figures 2 to 6, a continuous circulating powder spreading structure includes a powder spreading scraper 16, a gear bearing 11, and a platen 24. Both the gear bearing 11 and the platen 24 are provided with a shaped through hole. The gear bearing 11 includes The outer ring 12 and the inner ring 13 nested in the outer ring 12 and capable of rotating relative to the outer ring, the inner ring 13 is fixed to the upper end of the table 24, the powder spreader 16 is fixed to the upper end of the outer ring 12, and the outer ring 12 is provided with transmission teeth in the circumferential direction , The platen 24 is provided with a printing substrate 31 for forming parts; the upper end of the powder spreading scraper 16 is provided with a buffer powder bin, and the buffer powder bin is provided with a deflector 19, which is arranged obliquely along the length direction of the powder spreader 16 In the buffer powder silo, the deflector 19 is provided with a plurality of deflector holes 42, the lower end of the deflector 19 is provided with a deflector 39, the upper end of the deflector 39 is an inclined surface, and the lower end of the powder spreading scraper 16 is located on the deflector. 39 is provided with a powder spreading groove 41 at the lower end of the inclined surface.

The powder spreading scraper 16 is fixed to the outer ring 12 by a scraper bracket 17, which is provided with a connection through hole, and is fixedly connected to the outer ring 12 by countersunk bolts. The scraper support 17 and the powder spreading scraper 16 are connected or welded by bolts. A scraper body 43 is fixed at the lower end of the powder spreading blade 16 through a scraper clamp 40, which facilitates the replacement of the scraper body and ensures the smoothness of the powder spreading surface; balls are arranged between the outer ring 12 and the inner ring 13 to reduce the difference between the outer ring 12 and the inner ring 13 Rotational friction between. The scraper clamping plate 40 includes a left clamping plate and a right clamping plate for clamping the scraper body 43. The powder spreading scraper 16 is provided with a mounting groove at the lower end, and the clamping ends of the left and right clamping plates are provided with a scraper body mounting groove. The scraper body passes through the left and right clamping plates. The clamping plate is clamped and installed in the installation groove of the squeegee body, the left clamping plate and the right clamping plate are fixed in the installation groove of the lower end of the powder spreading scraper 16, and the left and right clamping plates are interference fit with the installation groove of the lower end of the powder spreading scraper 16.

The powder spreading blade 16 is set along the diameter of the outer ring 12, and the center point of the powder spreading blade 16 coincides with the center of the outer ring 12 to ensure even powder spreading during the powder spreading process; there are two symmetrical settings in the buffer powder bin at the upper end of the powder spreading blade 16 The two baffles 19 of the two baffles 19 are close to one end lower than the other end of the two baffles 19, and the printing material in the powder spreading scraper 16 can be guided to the powder spreading tank 41 through the baffle 37 to flow out , And with the rotation of the powder spreading blade 16 evenly spread on the printing surface, the two symmetrically arranged baffles 19 can spread powder in two half areas at the same time, which improves the printing efficiency.

As shown in Figure 1, the additive manufacturing forming device based on the above-mentioned continuous circulating powder spreading structure includes a Z-axis transmission assembly 3, a gas circulating dust removal structure and an optical path scanning structure.

The Z-axis transmission assembly 3 includes a cylinder block 30 and a driving device for driving the printing substrate 31 to move up and down in the cylinder block 30. The platen 24 is fixed to the upper end of the cylinder block 30, and the formed through hole of the platen 24 is coaxial with the cylinder block 30. The upper end of the platen 24 is provided with a side plate 25 and a top plate 26. The platen 24, the side plate 25, the top plate 26 and the cylinder 30 form a printing forming cavity. The platen 24 is also fixed with a powder spreader for driving the outer ring 12 to rotate. Drive motor 15, powder spreading drive motor 15 meshes with the outer gear of outer ring 12 through drive gear 14, thereby driving outer ring 12 to rotate, thereby driving the powder spreading scraper to rotate; the table 24 is provided with a gas inlet 37 and a gas outlet 38 for use For replacing the gas in the printing forming cavity, the gas inlet and the gas outlet are respectively arranged on both sides of the platen 24 to ensure the gas replacement efficiency in the printing forming cavity.

The gas circulating dust removal structure includes a separator 4, a dust removal filter element 5, and a circulating fan 6. The gas inlet of the separator 4 is connected to the gas outlet of the table 24, and the gas outlet of the separator 4 is connected to the gas inlet of the dust removal filter element 5. The dust removal filter element The gas outlet of 5 discharges the filtered gas and recovers the inert gas displaced during the printing process. The gas outlet of the circulating fan 6 is connected to the gas inlet 37 of the platen 24;

The optical path scanning structure is arranged on the top plate 26, and the optical path scanning structure can be printed and formed on the printing substrate 31. The optical path scanning structure includes a laser 8, a galvanometer 27, a dynamic focus mirror 28, and a collimating beam expander 29. The laser beam is from the laser After 8 is emitted, it passes through the collimating beam expander 29, the dynamic focusing lens 28 and the galvanometer 27 in sequence after passing through the optical fiber. The galvanometer 27 shoots the final shaped laser beam to the printing surface. It also includes a laser 8 for providing a laser beam. The laser 8 is connected to an electrical cabinet 7 and an industrial computer 9 for providing a printing laser beam.

It also includes a main frame 1 for fixing the Z-axis transmission assembly 3, the gas circulation dust removal structure and the light path scanning structure.

The driving device of the Z-axis transmission assembly 3 includes a piston assembly arranged in the cylinder 30. The piston assembly includes a heating plate 32, a heat insulation plate 33, a sealing plate 34, a water-cooling plate 35 and a lead screw 36 arranged in order from top to bottom. The printing substrate 31 is arranged at the upper end of the heating plate 32, and the lead screw 36 is arranged under the water-cooling plate 35. The piston assembly moves up and down along the cylinder wall in the cylinder 30 under the driving action of the lead screw 36, thereby driving the printing substrate 31 on the cylinder 30. The inner moves up and down along the cylinder wall. The heating plate 32 is used for auxiliary heating of the printing substrate 31. The sealing plate 34 and the inner wall of the cylinder body 30 are sealed by a sealing gasket to prevent the molding powder from falling into the lead screw 36. Cooling water is provided in the water cooling plate 35 to prevent the lead screw 36 from overheating.

It also includes a powder feeding device. The powder feeding device includes a powder bin 23 and a powder feeding box body 21 arranged at the lower end of the powder bin 23. The powder feeding box body 21 is provided with a powder feeding roller 20, and the powder feeding roller 20 is driven by a powder feeding motor 22. , The powder feeding roller 20 is located in the powder feeding box body 21 and is provided with a powder feeding groove. The lower end of the powder feeding box body 21 is provided with a funnel 18 for drainage. The inlet of the funnel 18 is connected with the outlet of the powder feeding box body 21. 18 The discharge port is located at the upper end of the powder spreading scraper. The powder feeding device is fixed in the printing forming cavity, and the specific powder feeding device is fixed on the platen 24 or on the side plate through a bracket.

The powder bin 23 stores the powder material to be printed inside, and the powder feed roller 20 is driven by the powder feed motor 22 to rotate and drive the powder material to fall into the powder spreading blade (16) through the funnel 18, and the powder spreading blade 16 is provided with a flow guide. The plate 19 guides the powder material to be evenly distributed in the powder spreading scraper 16; the powder spreading scraper 16 is connected to the outer ring 12 through the scraper bracket 17, and the driving gear 14 drives the outer ring 12 to rotate under the action of the powder spreading drive motor 15, and then drives it The powder spreading blade 16 rotates and spreads the powder, and at the same time, the focused laser beam emitted from the galvanometer 27 irradiates the powdered surface for printing and forming, thereby realizing the cyclic continuous forming process of scanning and printing while spreading the powder.

Several grooves are evenly distributed on the surface of the powder feeding roller 20, and the powder can be accurately measured by controlling the rotation angle. The cylinder 30 is a circular cylinder with the same diameter as the inner diameter of the inner ring 13; the gear bearing 11 is coaxial with the cylinder 30; the powder spreading scraper 16 is installed above the outer ring 12 along the diameter direction of the cylinder 30, that is, spreading powder The center of the scraper passes through the axis of the cylinder 30; a sealing rubber is arranged between the outer ring 12 and the inner ring 13 of the gear bearing 11; the inner ring 13 is fixed above the platen 24, and the outer ring 12 and the powder spreader 16 are fixedly connected together ; The baffle 19 built in the powder spreading blade 16 can evenly distribute the printing material in the powder spreading blade 16; the powder spreading blade 16 is provided with a powder spreading groove, and the printing material in the powder spreading blade 16 can pass through this spreading powder The groove flows out and spreads evenly on the printing surface with the rotation of the powder spreading blade 16;

The printing area is a circular area, and the powder spreading blade 16 rotates around the axis of the outer gear bearing 11 in the circular area, so the printing material always stays in the circular area, and the powder material can be recycled.

In the printing process, the forming cavity needs to be filled with inert protective gas to protect the printed parts from oxidation and to take away the smoke and impurities generated by printing in time; the mixed gas containing smoke and impurities enters the separator 4 to achieve large particles of smoke and gas After the initial separation of the dust, the pure protective gas is further efficiently filtered by the dust removal filter element 5, and then the protective gas is driven by the circulating fan 6 to return to the forming cavity and continuously circulate. The present invention has a continuous circulating powder spreading structure and additive manufacturing forming equipment. The advantage is that the powder material does not overflow the printing area during powder spreading, and can realize the simultaneous spreading and scanning during the SLM forming process, that is, the powder spreading and scanning are performed while spreading powder. The high-efficiency printing process is very suitable for the printing and forming of round/ring parts.

Claims

A continuous circulating powder spreading structure, which is characterized in that it includes a powder spreading scraper (16), a gear bearing (11) and a platen (24). The gear bearing (11) and the platen (24) are both provided with a shaped through hole. , The gear bearing (11) includes an outer ring (12) and an inner ring (13) nested in the outer ring (12) that can rotate relative to the outer ring. The inner ring (13) is fixed on the upper end of the platen (24) and spreads powder. The scraper (16) is fixed on the upper end of the outer ring (12), the outer ring (12) is provided with transmission teeth in the circumferential direction, the lower end of the platen (24) is provided with a printing substrate (31) for part forming, and the powder spreader (16) ) The upper end is provided with a buffer powder bin. The buffer powder bin is provided with a baffle plate (19) arranged obliquely along the length of the powder spreading scraper (16), and a plurality of baffle holes (42) are provided on the baffle plate (19) , The lower end of the baffle (19) is provided with a baffle (39), the upper end of the baffle (39) is an inclined surface arranged along the width direction of the powder spreading blade (16), and the lower end of the powder spreading blade (16) is located at the baffle A powder spreading groove (41) is provided at the lower end of the inclined surface of the block (39), and the powder spreading groove (41) is arranged along the length direction of the powder spreading scraper (16).
The continuous circulating powder spreading structure according to claim 1, characterized in that the powder spreading scraper (16) is arranged along the diameter of the outer ring (12), and the center point of the powder spreading scraper (16) is connected to the center of the outer ring (12). Coinciding, there are two symmetrically arranged two deflectors (19) in the buffer powder bin at the upper end of the powder spreading scraper (16), the two deflectors (19) near one end are lower than the two deflectors (19) On the other end.
A continuous circulating powder spreading structure according to claim 1, characterized in that the powder spreading scraper (16) is fixed on the outer ring (12) by a scraper bracket (17), and the scraper bracket (17) is provided with a passing sinker. A connection through hole for a fixed connection between a head bolt and an outer ring (12), a scraper bracket (17) and a powder spreading scraper (16) are connected or welded by bolts.
The continuous circulating powder spreading structure according to any one of claims 1 to 3, characterized in that the lower end of the powder spreading scraper (16) is fixed with a scraper body (43) through a scraper clamp (40).
A continuous circulating powder spreading structure according to any one of claims 1-3, characterized in that it further comprises a powder feeding device, the powder feeding device comprising a powder bin (23) and a feeding device arranged at the lower end of the powder bin (23) The powder box body (21), the powder feeding box body (21) is provided with a powder feeding roller (20), the powder feeding roller (20) is driven by the powder feeding motor (22), and the powder feeding roller (20) is located in the powder feeding box body (21) The inner part is provided with a powder feeding trough. The lower end of the powder feeding box body (21) is provided with a funnel (18) for drainage. The inlet of the funnel (18) is connected with the outlet of the powder feeding box body (21). (18) The discharge port is located at the upper end of the powder spreading scraper.
An additive manufacturing forming device based on the continuous circulating powder spreading structure of claim 1, characterized in that it comprises a Z-axis transmission assembly (3), a gas circulating dust removal structure and an optical path scanning structure,

The Z-axis transmission assembly (3) includes a cylinder block (30) and a driving device for driving the printing substrate (31) to move up and down in the cylinder block (30). The platen (24) of the continuous circulating powder spreading structure is fixed to the cylinder block (30) At the upper end, the formed through hole of the platen (24) is arranged coaxially with the cylinder body (30). The upper end of the platen (24) is provided with a side plate (25) and a top plate (26). The platen (24), side The plate (25), the top plate (26) and the cylinder body (30) form a printing forming cavity. The platen (24) is fixed with a powder spreading drive motor (15) for driving the outer ring (12) to rotate; it is used for the gas circulation dust removal structure To replace and remove dust from the gas in the printing forming cavity; the light path scanning structure is fixed on the upper end of the powder spreading blade (16) of the continuous circulating powder spreading structure, and the light path scanning structure is arranged in the printing forming cavity for printing on the printing substrate (31) The surface is printed and formed.
The additive manufacturing forming device according to claim 6, characterized in that the table (24) is provided with a gas inlet (37) and a gas outlet (38); the gas circulating dust removal structure includes a separator (4), a dust removal filter element (5) Connect with the circulating fan (6), the gas inlet of the separator (4) is connected with the gas outlet of the platen (24), the gas outlet of the separator (4) is connected with the gas inlet of the dust filter (5), the circulating fan ( The gas outlet of 6) is connected with the gas inlet (37) of the platen (24).
The additive manufacturing forming device according to claim 6, wherein the optical path scanning structure is arranged on the top plate (26), and the optical path scanning structure includes a laser (8), a galvanometer (27), and a dynamic focus mirror (28). ) And collimating beam expander (29). After the laser beam is emitted from the laser (8), it passes through the optical fiber and then passes through the collimating beam expander (29), dynamic focus lens (28) and galvanometer (27), galvanometer (27) The final forming laser beam is directed to the printing forming surface.
The additive manufacturing forming device according to claim 6, characterized in that the driving device of the Z-axis transmission assembly (3) includes a piston assembly arranged in the cylinder (30), and the piston assembly includes a piston assembly arranged in order from top to bottom. The heating plate (32), the heat insulation plate (33), the sealing plate (34), the water cooling plate (35) and the lead screw (36), and the printing substrate (31) is arranged on the upper end of the heating plate (32).
The additive manufacturing forming device according to claim 6, characterized in that the powder spreading drive motor (15) meshes with the outer gear of the outer ring (12) through a drive gear (14).