CN213614137U - SLM equipment based on beat printer head scanning motion - Google Patents

Abstract

The utility model discloses a SLM equipment based on beat printer head scanning motion, including base and longmen module, be equipped with the first drive module who is used for driving longmen module linear motion on the base, longmen module includes first base, laser module and is used for driving laser module linear motion's second drive module, the laser module includes third base, laser head and is used for driving laser head linear motion's fourth drive module. The utility model discloses compact structure, the operation suitability of equipment is high, and prints size and scanning range and does not receive the restriction of laser head structure, reduces manufacturing cost.

Description

SLM equipment based on beat printer head scanning motion

Technical Field

The utility model relates to a vibration material disk field, concretely relates to SLM equipment based on beat printer head scanning motion.

Background

SLM (Selective laser melting) is a main technical approach in metal material additive manufacturing. The technology selects laser as an energy source, scans layer by layer on a metal powder bed layer according to a planned path in a three-dimensional CAD slicing model, achieves the effect of metallurgical bonding by melting and solidifying the scanned metal powder, and finally obtains the metal part designed by the model.

The SLM technique overcomes the difficulties associated with the conventional techniques for manufacturing metal parts having complex shapes. It can directly form metal parts with almost full compactness and good mechanical properties. Metal additive manufacturing techniques are simply divided into two broad categories according to different raw material supply modes: powder laying type additive manufacturing technology and powder feeding and wire feeding type additive manufacturing technology.

At present, a powder-laying type laser metal 3d printing device usually adopts a galvanometer scanning mode. However, the adopted scanning galvanometer structure is realized by driving the deflection angle of the reflecting mirror through a motor, and then the focusing effects at different positions are consistent through a field lens or dynamic focusing. When the deflection angle exceeds the design value, the focusing effect cannot be ensured to be consistent, and the printing size and the scanning range are limited. Meanwhile, the optical structure of the laser scanning galvanometer is complex and belongs to a special mechanism, so that the manufacturing cost is high, and the market popularization is not facilitated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an improve laser scanning scope and reduce manufacturing cost's SLM equipment based on beat printer head scanning motion.

The utility model provides a technical scheme that above-mentioned problem adopted is:

the utility model provides a SLM equipment based on beat printer head scanning motion, includes base and longmen module, be equipped with the first drive module that is used for driving longmen module linear motion on the base, longmen module includes first base, laser module and is used for driving laser module linear motion's second drive module, the laser module includes third base, laser head and is used for driving laser head linear motion's fourth drive module.

As a further improvement of the above technical scheme, the first driving module includes a first motor, a first threaded rod and two first sliding rods, the first motor is fixedly mounted on the base, an output shaft of the first motor is fixedly connected with one end of the first threaded rod, the other end of the first threaded rod is rotatably connected with the base, a threaded hole is formed in the first base, the first threaded rod is in threaded fit with the first base, the first sliding rods are respectively located on two sides of the first threaded rod, the first sliding rods are fixedly connected on the base, and the first base is slidably connected on the first sliding rods. The first motor drives the first threaded rod to rotate, so that the first base moves linearly on the first sliding rod, the gantry module is controlled to move linearly in the horizontal x-axis direction, and the aim of controlling the cutting head and the laser head to move linearly in the horizontal x-axis direction is fulfilled.

As a further improvement of the above technical solution, the second driving module includes a second motor, a first gear set, a second rotating shaft, a second grooved column and a second one-way bearing, the second motor is fixedly connected to the first base, the first gear set comprises a first gear and a third gear, the first gear is fixedly connected to an output shaft of the second motor, the third gear is fixedly connected with one end of the second rotating shaft, the third gear is meshed with the first gear, the other end of the second rotating shaft is rotatably connected with the first base, the second grooved column is rotatably connected to the second rotating shaft, an inner ring of the second one-way bearing is fixedly connected with the second rotating shaft, an outer ring of the second one-way bearing is fixedly connected with the right end of the second grooved column, the third base is integrally connected with a sliding pin, the second groove column is provided with a guide groove, and one end of the sliding pin is located in the guide groove of the second groove column so that the second groove column drives the third base to slide when the second groove column rotates. When the second motor rotates, the second groove column rotates and drives the third base to do linear reciprocating motion on the first base, so that the laser module is controlled to do linear movement in the horizontal y-axis direction, and the aim of controlling the laser head to do linear movement in the horizontal y-axis direction is fulfilled.

As the further improvement of the technical scheme, the fourth driving module comprises a third motor, a second gear set and a second threaded rod, the third motor is fixedly connected to the third base, the second gear set comprises a fourth gear and a fifth gear, the fourth gear is fixedly connected to an output shaft of the third motor, the fifth gear is fixedly connected with one end of the second threaded rod, the fourth gear is meshed with the fifth gear, the other end of the second threaded rod is rotatably connected to the third base, a threaded hole is formed in the laser head, and the laser head is in threaded fit with the second threaded rod. The second gear set is driven to rotate through the rotation of the third motor, so that the second threaded rod rotates, the laser head moves linearly on the third base, and the purpose of controlling the linear movement of the laser head in the vertical z-axis direction is achieved.

As the further improvement of above-mentioned technical scheme, the laser head includes lens cone, collimating mirror, focusing mirror, protective glass and safety cover, and collimating mirror, focusing mirror and protective glass are in proper order from last down installation be fixed in the lens cone, through setting up the protective glass, avoid producing the slag and the metal of splash in the operation process to smoke and pollute the optical lens group, and then reduce the probability that the optical lens group is destroyed, reduce the cost of manufacture, and the bottom of lens cone is fixed in the safety cover installation, collimating mirror and focusing mirror are convex lens, first air inlet has been seted up to the bottom side of lens cone, and the inner space intercommunication of first air inlet and lens cone, seted up the second air inlet on the safety cover, the inner space intercommunication of second air inlet and safety cover, the bottom of safety cover is the ring structure, and a plurality of ventholes have been seted up to the bottom of safety. Because laser can produce a large amount of heats at the printing in-process, arouse the base easily and cause the heat altered shape, add inert gas in toward the lens cone through first air inlet and add inert gas in toward the safety cover through the second air inlet to form the inert gas guard circle in the atmosphere of shining of laser, be used for preventing oxidation and nitrogenize, avoid the part damage.

As a further improvement of the above technical scheme, the powder spreading device further comprises a powder spreading module, wherein the powder spreading module is located between the base and the gantry module, the powder spreading module comprises a fourth base, a forming module, a powder feeding module, a sliding strip provided with a scraper and a fifth driving module used for driving the sliding strip to move linearly, the forming module comprises a forming substrate and a sixth driving module used for driving the forming substrate to move linearly, and the powder feeding module comprises a powder feeding substrate and a seventh driving module used for driving the powder feeding substrate to move linearly.

As a further improvement of the above technical scheme, the fifth driving module includes a fourth motor, a bevel gear set, a third threaded rod and a second sliding rod, the fourth motor is fixedly connected to the fourth base, the bevel gear set includes a first bevel gear and a second bevel gear, the first bevel gear is fixedly connected to an output shaft of the fourth motor, the second bevel gear is fixedly connected to the third threaded rod, the first bevel gear is engaged with the second bevel gear, the third threaded rod is rotatably connected to the fourth base, a threaded hole is formed in one end of the sliding strip, one end of the sliding strip is in threaded fit with the third threaded rod, a through hole is formed in the other end of the sliding strip, the second sliding rod penetrates through the through hole so that the other end of the sliding strip is slidably connected to the second sliding rod, and the second sliding rod is fixedly connected to the fourth base. The bevel gear set is driven to rotate through the rotation of the fifth motor, the third threaded rod is driven to rotate, the slide bar moves linearly on the fourth base, the metal powder on the powder feeding base plate is pushed to the forming base plate by the scraper on the slide bar, and the purpose of automatically spreading the powder on the forming base plate is achieved.

As a further improvement of the above technical solution, the sixth driving module and the seventh driving module have the same structure, and each of the sixth driving module and the seventh driving module includes a fifth motor, a fourth threaded rod, a first slider, a second slider, and a scissors mechanism, the fifth motor is fixedly connected to the fourth base, an output shaft of the fifth motor is fixedly connected to one end of the fourth threaded rod, the other end of the fourth threaded rod is rotatably connected to the fourth base, the first slider is slidably connected to the fourth base, the first slider is provided with a threaded hole, the first slider is in threaded fit with the fourth threaded rod, one end of the bottom end of the scissors mechanism is hinged to the first slider, the other end of the bottom end of the scissors mechanism is hinged to the fourth base, the second slider of the sixth driving module is slidably connected to the molding substrate, the second slider of the seventh driving module is slidably connected to the powder feeding substrate, and one end of the top end of the scissors mechanism is hinged to the second slider, the other end of the top end of the scissor mechanism of the sixth driving module is hinged with the forming substrate, and the other end of the top end of the scissor mechanism of the seventh driving module is hinged with the powder feeding substrate. The first sliding block slides through the rotation of the fifth motor, so that the shearing fork mechanism deforms, the height of the shearing fork mechanism is controlled, and the purposes of lifting the formed substrate and feeding the powder substrate are achieved.

As a further improvement of the above technical scheme, the fifth driving module includes a sixth motor, a synchronous pulley set, a fifth threaded rod and a third sliding rod, the sixth motor is fixedly connected to the fourth base, the synchronous pulley set includes a first synchronous pulley and a second synchronous pulley, the first synchronous pulley is fixedly connected to an output shaft of the sixth motor, the second synchronous pulley is fixedly connected to the fifth threaded rod, the first synchronous pulley and the second synchronous pulley are connected through synchronous belt transmission, the fifth threaded rod is rotatably connected to the fourth base, a threaded hole is formed in one end of the sliding strip, one end of the sliding strip is in threaded fit with the fifth threaded rod, a through hole is formed in the other end of the sliding strip, the third sliding rod penetrates through the through hole so that the other end of the sliding strip is slidably connected to the third sliding rod, and the third sliding rod is fixedly connected to the fourth base. Rotate through the sixth motor and drive first synchronous pulley and rotate, make second synchronous pulley rotate and drive the fifth threaded rod and rotate through synchronous belt drive to make the draw runner linear motion on the fourth base, the scraper on the draw runner will send the metal powder on the powder base plate to push away the shaping base plate on, reach the automatic mesh of spreading the powder on the shaping base plate.

Compared with the prior art, the utility model, have following advantage and effect:

the utility model discloses a cooperation is used between first drive module, second drive module and the fourth drive module, has realized the purpose of triaxial coordinated control laser head operation, compact structure and improved the operation suitability of equipment. Meanwhile, the direct focusing laser head is matched, so that the printing size and the scanning range are not limited by the structure of the laser head, and the applicability is improved. Through cooperation use between fifth drive module, sixth drive module and the seventh drive module, realized the automatic function of spreading the powder of equipment, compact structure and spread powder thickness evenly, improve manufacturing quality, reduce manufacturing cost. Furthermore, a single laser head mode is used for replacing a vibrating lens structure and a coaxial atmosphere protection structure on the laser head, so that structures such as an atmosphere cabin, a purifying device and a vacuum device are reduced, the cost is reduced, the operation process is simplified, and the man-machine interaction and the working efficiency are improved.

Drawings

Fig. 1 is a schematic structural diagram of a front surface of a material-increasing and material-decreasing composite metal 3d printing device according to an embodiment.

Fig. 2 is a partial sectional view of the powder paving module shown in fig. 1.

Fig. 3 is a structural sectional view of the powder paving module shown in fig. 1.

Fig. 4 is a schematic structural diagram of a side surface of the material-increasing and material-decreasing composite metal 3d printing apparatus according to the embodiment.

Figure 5 is a structural cross-sectional view of the gantry module shown in figure 4.

Fig. 6 is a structural sectional view of the cutting module shown in fig. 4.

Fig. 7 is a structural sectional view of the laser module shown in fig. 4.

Fig. 8 is a structural sectional view of the laser head shown in fig. 7.

Fig. 9 is a schematic structural diagram of a fifth driving module in the second embodiment.

Wherein, 1-base, 11-first driving module, 111-first motor, 112-first threaded rod, 113-first sliding rod, 2-gantry module, 21-first base, 22-cutting module, 221-second base, 222-cutting head, 223-third driving module, 23-laser module, 231-third base, 232-laser head, 2321-lens cone, 23211-first air inlet, 2322-collimating mirror, 2323-focusing mirror, 2324-protecting mirror, 2325-protecting cover, 23251-second air inlet, 23252-air outlet hole, 233-fourth driving module, 24-second driving module, 241-second motor, 242242-first gear set, 2421-first gear, 2422-second gear, 2423-a third gear, 243-a first rotating shaft, 244-a first groove column, 245-a first one-way bearing, 246-a second rotating shaft, 247-a second groove column, 248-a second one-way bearing, 25-a third motor, 26-a second gear set, 261-a fourth gear, 262-a fifth gear, 27-a second threaded rod, 3-a powder spreading module, 31-a fourth base, 311-a collecting tank, 32-a forming module, 321-a forming substrate, 322-a sixth driving module, 33-a powder feeding module, 331-a powder feeding substrate, 332-a seventh driving module, 34-a sliding strip, 341-a scraper, 35-a fifth driving module, 351-a fourth motor, 352-a bevel gear set, 3521-a first bevel gear, 3522-a second bevel gear, 353-third threaded rod, 354-second sliding rod, 36-fifth motor, 37-fourth threaded rod, 38-first sliding block, 39-second sliding block, 40-scissor mechanism, 4-sliding pin, 5-guide groove, 6-controller, 71-sixth motor, 72-synchronous pulley set, 721-first synchronous pulley, 722-second synchronous pulley, 723-synchronous belt, 73-fifth threaded rod and 74-third sliding rod.

Detailed Description

The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.

The first embodiment.

Referring to fig. 1 to 8, the composite metal 3d printing apparatus with material added and removed in the present embodiment includes a base 1, a gantry module 2 and a powder spreading module 3, wherein a first driving module 11 for driving the gantry module 2 to move linearly is disposed on the base 1, the gantry module 2 includes a first base 21, a cutting module 22, a laser module 23 and a second driving module 24 for driving the cutting module 22 and the laser module 23 to move linearly, the cutting module 22 includes a second base 221, a cutting head 222 and a third driving module 223 for driving the cutting head 222 to move linearly, the laser module 23 includes a third base 231, a laser head 232 and a fourth driving module 233 for driving the laser head 232 to move linearly, the powder spreading module 3 is disposed between the base 1 and the gantry module 2, a controller 6 is externally connected to the powder spreading module 3, and the powder spreading module 3 includes a fourth base 31, a second base 31, a third driving module 24, and a fourth driving module 233 for driving the, The powder feeding module 33 comprises a first motor 111, a first threaded rod 112 and two first sliding rods 113, the first motor 111 is fixedly arranged on the base 1, an output shaft of the first motor 111 is fixedly connected with one end of the first threaded rod 112, the other end of the first threaded rod 112 is rotatably connected with the base 1, the first base 21 is provided with a threaded hole, the first threaded rod 112 is in threaded fit with the first base 21, the first sliding rod 113 is respectively located at two sides of the first threaded rod 112, the first sliding rod 113 is fixedly connected to the base 1, the first base 21 is slidably connected to the first sliding rod 113, the second driving module 24 includes a second motor 241, a first gear set 242, a first rotating shaft 243, a first grooved column 244, a first one-way bearing 245, a second rotating shaft 246, a second grooved column 247, and a second one-way bearing 248, the second motor 241 is fixedly connected to the first base 21, the first gear set 242 includes a first gear 2421, a second gear 2422, and a third gear 2423, the first gear 2421 is fixedly connected to an output shaft of the second motor 241, the second gear 2422 is fixedly connected to one end of the first rotating shaft 243, the second gear 2422 is engaged with the first gear 2421, the other end of the first rotating shaft 243 is rotatably connected to the first base 21, the first grooved column 244 is rotatably connected to the first rotating shaft, an inner ring of the first one-way bearing 245 is fixedly connected with the first rotating shaft 243, an outer ring of the first one-way bearing 245 is fixedly connected with a left end of the first grooved column 244, a third gear 2423 is fixedly connected with one end of the second rotating shaft 246, the third gear 2423 is meshed with the first gear 2421, the other end of the second rotating shaft 246 is rotatably connected with the first base 21, the second grooved column 247 is rotatably connected with the second rotating shaft 246, an inner ring of the second one-way bearing 248 is fixedly connected with the second rotating shaft 246, an outer ring of the second one-way bearing 248 is fixedly connected with a right end of the second grooved column 247, the second base 221 and the third base 231 are integrally connected with a sliding pin 4, the first grooved column 244 and the second grooved column 247 are both provided with a guide groove 5, one end of the sliding pin 4 of the second base 221 is located in the guide groove 5 of the first grooved column 244 so that the first grooved column 244 drives the second base 221 to slide when the first grooved column 244 rotates, one end of the sliding pin 4 of the third base 231 is located in the guiding groove 5 of the second grooved column 247 so that the second grooved column 247 drives the third base 231 to slide when the second grooved column 247 rotates, the rotating directions of the first one-way bearing 245 and the second one-way bearing 248 are opposite, the third driving module 223 and the fourth driving module 233 have the same structure, the third driving module 223 and the fourth driving module 233 each include a third motor 25, a second gear set 26 and a second threaded rod 27, the third motor 25 of the third driving module 223 is fixedly connected to the second base 221, the third motor 25 of the fourth driving module 233 is fixedly connected to the third base 231, the second gear set 26 includes a fourth gear 261 and a fifth gear 262, the fourth gear 261 is fixedly connected to an output shaft of the third motor 25, the fifth gear 262 is fixedly connected to one end of the second threaded rod 27, and the fourth gear 261 is engaged with the fifth gear 262, the other end of the second threaded rod 27 of the third driving module 223 is rotatably connected to the second base 221, the other end of the second threaded rod 27 of the fourth driving module 233 is rotatably connected to the third base 231, both the cutting head 222 and the laser head 232 are provided with threaded holes, both the cutting head 222 and the laser head 232 are in threaded fit with the second threaded rod 27, the laser head 232 includes a lens barrel 2321, a collimating mirror 2322, a focusing mirror 2323, a protecting mirror 2324 and a protecting cover 2325, the collimating mirror 2322, the focusing mirror 2323 and the protecting mirror 2324 are sequentially mounted and fixed in the lens barrel 2321 from top to bottom, the protecting cover 2325 is mounted and fixed at the bottom end of the lens barrel 2321, both the collimating mirror 2322 and the focusing mirror 2323 are convex lenses, the bottom end side surface of the lens barrel 2321 is provided with a first air inlet 23211 communicated with the inner space of the lens barrel 2321, the protecting cover 2325 is provided with a second air inlet 23251, and the second air inlet 23251 is communicated with, the bottom end of the protection cover 2325 is of a circular ring structure, the bottom end of the protection cover 2325 is provided with a plurality of air outlet holes 23252, the powder paving module 3 is further included, the powder paving module 3 is located between the base 1 and the gantry module 2, the powder paving module 3 is externally connected with the controller 6, the powder paving module 3 comprises a fourth base 31, a forming module 32, a powder feeding module 33, a sliding strip 34 provided with a scraper 341 and a fifth driving module 35 used for driving the sliding strip 34 to move linearly, two collecting grooves 311 used for containing residual metal powder during powder paving are formed in the fourth base 31, the forming module 32 comprises a forming substrate 321 and a sixth driving module 322 used for driving the forming substrate 321 to move linearly, the powder feeding module 33 comprises a powder feeding substrate 331 and a seventh driving module 332 used for driving the powder feeding substrate 331 to move linearly, and the fifth driving module 35 comprises a fourth motor 351, a bevel gear set 352, A third threaded rod 353 and a second sliding rod 354, the fourth motor 351 is fixedly connected to the fourth base 31, the bevel gear set 352 includes a first bevel gear 3521 and a second bevel gear 3522, the first bevel gear 3521 is fixedly connected to an output shaft of the fourth motor 351, the second bevel gear 3522 is fixedly connected to the third threaded rod 353, the first bevel gear 3521 is engaged with the second bevel gear 3522, the third threaded rod 353 is rotatably connected to the fourth base 31, one end of the slider 34 is provided with a threaded hole, one end of the slider 34 is in threaded engagement with the third threaded rod 353, the other end of the slider 34 is provided with a through hole, the second sliding rod 354 penetrates through the through hole to enable the other end of the slider 34 to be slidably connected to the second sliding rod 354, the second sliding rod 354 is fixedly connected to the fourth base 31, the sixth driving module 322 is structurally identical to the seventh driving module 332, and the sixth driving module 322 and the seventh driving module 332 each include a fifth motor 36, a second bevel gear 3522, a, A fourth threaded rod 37, a first slider 38, a second slider 39 and a scissors mechanism 40, wherein the fifth motor 36 is fixedly connected to the fourth base 31, an output shaft of the fifth motor 36 is fixedly connected with one end of the fourth threaded rod 37, the other end of the fourth threaded rod 37 is rotatably connected with the fourth base 31, the first slider 38 is slidably connected with the fourth base 31, a threaded hole is formed in the first slider 38, the first slider 38 is in threaded fit with the fourth threaded rod 37, one end of the bottom end of the scissors mechanism 40 is hinged with the first slider 38, the other end of the bottom end of the scissors mechanism 40 is hinged with the fourth base 31, the second slider 39 of the sixth driving module 322 is slidably connected with the molding substrate 321, the second slider 39 of the seventh driving module 332 is slidably connected with the powder feeding substrate 331, one end of the top end of the scissors mechanism 40 is hinged with the second slider 39, the other end of the top end of the scissors mechanism 40 of the sixth driving module 322 is hinged with the molding substrate 321, the other end of the top end of the scissor mechanism 40 of the seventh driving module 332 is hinged to the powder feeding base plate 331.

To sum up, the utility model discloses application method is as follows:

the method comprises the following steps: the first motor rotates, the first base slides, the position of the laser head in the horizontal x-axis direction is adjusted, the second motor rotates, the third base slides, the position of the laser head in the horizontal y-axis direction is adjusted, the third motor rotates, the laser head slides, the position of the laser head in the vertical z-axis is adjusted, the laser head operates and prints, and inert gas is input into the laser head;

step two: the fifth motor rotates, the forming substrate descends, the powder feeding substrate ascends, the fourth motor rotates, the sliding strip slides, the scraper pushes the metal powder on the powder feeding substrate to the forming substrate, and the redundant metal powder is pushed into the collecting tank;

step three: after printing is finished, the second motor rotates, the third base slides, and the laser head is adjusted to the position of the most side edge;

step four: the first motor rotates, the first base slides to adjust the position of the cutting head in the horizontal x-axis direction, the second motor rotates, the second base slides to adjust the position of the cutting head in the horizontal y-axis direction, the third motor rotates, the cutting head slides to adjust the position of the cutting head in the vertical z-axis direction, and the cutting head operates to perform finish machining.

Example two.

Referring to fig. 9, the other structure of the composite metal 3d printing apparatus of the present embodiment is substantially the same as that of the first embodiment, except that: the fifth driving module 35 includes a sixth motor 71, a synchronous pulley set 72, a fifth threaded rod 73 and a third sliding rod 74, the sixth motor 71 is fixedly connected to the fourth base 31, the synchronous pulley set 72 includes a first synchronous pulley 721 and a second synchronous pulley 722, the first synchronous pulley 721 is fixedly connected to the output shaft of the sixth motor 71, the second synchronous pulley 722 is fixedly connected to the fifth threaded rod 73, the first synchronous pulley 721 and the second synchronous pulley 722 are in transmission connection through a synchronous belt 723, the fifth threaded rod 73 is rotatably connected to the fourth base 31, one end of the slide bar 34 is provided with a threaded hole, one end of the slide bar 34 is in threaded fit with the fifth threaded rod 73, the other end of the slide bar 34 is provided with a through hole, the third slide bar 74 penetrates through the through hole so that the other end of the slide bar 34 is slidably connected to the third slide bar 74, and the third slide bar 74 is fixedly connected with the fourth base 31.

The above description in this specification is merely illustrative of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims (9)

1. An SLM device based on print head scanning motion, characterized by: including base (1) and longmen module (2), be equipped with on base (1) and be used for driving longmen module (2) linear motion's first drive module (11), longmen module (2) include first base (21), laser module (23) and be used for driving laser module (23) linear motion's second drive module (24), laser module (23) include third base (231), laser head (232) and are used for driving laser head (232) linear motion's fourth drive module (233).

2. A printhead scanning motion based SLM device according to claim 1, characterised in that: first drive module (11) include first motor (111), first threaded rod (112) and two first slide bars (113), first motor (111) fixed mounting is on base (1), the output shaft of first motor (111) and the one end fixed connection of first threaded rod (112), the other end and base (1) of first threaded rod (112) rotate to be connected, threaded hole is seted up in first base (21), first threaded rod (112) and first base (21) screw-thread fit, first slide bar (113) are located the both sides of first threaded rod (112) respectively, first slide bar (113) fixed connection is on base (1), first base (21) sliding connection is on first slide bar (113).

3. A printhead scanning motion based SLM device according to claim 1, characterised in that: the second driving module (24) comprises a second motor (241), a first gear set (242), a second rotating shaft (246), a second grooved column (247) and a second one-way bearing (248), the second motor (241) is fixedly connected to the first base (21), the first gear set (242) comprises a first gear (2421) and a third gear (2423), the first gear (2421) is fixedly connected to an output shaft of the second motor (241), the third gear (2423) is fixedly connected with one end of the second rotating shaft (246), the third gear (2423) is meshed with the first gear (2421), the other end of the second rotating shaft (246) is rotatably connected with the first base (21), the second grooved column (246) is rotatably connected with the second rotating shaft (246), an inner ring of the second one-way bearing (248) is fixedly connected with the second rotating shaft (246), an outer ring of the second one-way bearing (248) is fixedly connected with a right end of the second grooved column (247), the third base (231) is integrally connected with a sliding pin (4), the second groove column (247) is provided with a guide groove (5), and one end of the sliding pin (4) is positioned in the guide groove (5) of the second groove column (247) so that the second groove column (247) drives the third base (231) to slide when the second groove column (247) rotates.

4. A printhead scanning motion based SLM device according to claim 1, characterised in that: fourth drive module (233) includes third motor (25), second gear set (26) and second threaded rod (27), third motor (25) fixed connection is on third base (231), second gear set (26) include fourth gear (261) and fifth gear (262), fourth gear (261) fixed connection is on the output shaft of third motor (25), the one end fixed connection of fifth gear (262) and second threaded rod (27), fourth gear (261) and fifth gear (262) meshing, the other end rotation of second threaded rod (27) is connected on third base (231), threaded hole has been seted up in laser head (232), laser head (232) and second threaded rod (27) screw-thread fit.

5. A printhead scanning motion based SLM device according to claim 1, characterised in that: laser head (232) include lens cone (2321), collimating mirror (2322), focusing mirror (2323), protective glass (2324) and safety cover (2325), and collimating mirror (2322), focusing mirror (2323) and protective glass (2324) are fixed in lens cone (2321) from last down installation in proper order, and the bottom in lens cone (2321) is fixed in safety cover (2325) installation, collimating mirror (2322) and focusing mirror (2323) are convex lens, first air inlet (23211) have been seted up to the bottom side of lens cone (2321), and first air inlet (23211) and the inner space intercommunication of lens cone (2321), seted up second air inlet (23251) on safety cover (2325), the inner space intercommunication of second air inlet (23251) and safety cover (2325), the bottom of safety cover (2325) is the ring structure, and a plurality of ventholes (23252) have been seted up to the bottom of safety cover (2325).

6. A printhead scanning motion based SLM device according to claim 1, characterised in that: still including spreading powder module (3), spread powder module (3) and be located between base (1) and gantry module (2), spread powder module (3) and include fourth base (31), shaping module (32), send powder module (33), install draw runner (34) of scraper (341) and be used for driving fifth drive module (35) of draw runner (34) linear motion, shaping module (32) are including shaping base plate (321) and be used for driving sixth drive module (322) of shaping base plate (321) linear motion, send powder module (33) including sending powder base plate (331) and being used for driving seventh drive module (332) that send powder base plate (331) linear motion.

7. A printhead scanning motion based SLM device according to claim 6, characterized in that: the fifth driving module (35) comprises a fourth motor (351), a bevel gear group (352), a third threaded rod (353) and a second sliding rod (354), the fourth motor (351) is fixedly connected to the fourth base (31), the bevel gear group (352) comprises a first bevel gear (3521) and a second bevel gear (3522), the first bevel gear (3521) is fixedly connected to an output shaft of the fourth motor (351), the second bevel gear (3522) is fixedly connected to the third threaded rod (353), the first bevel gear (3521) is meshed with the second bevel gear (3522), the third threaded rod (35353) is rotatably connected to the fourth base (31), one end of the sliding bar (34) is provided with a threaded hole, one end of the sliding bar (34) is in threaded fit with the third threaded rod (353), the other end of the sliding bar (34) is provided with a through hole, the second sliding rod (354) penetrates through the through hole to enable the other end of the sliding bar (34) to be slidably connected to the second sliding rod (354), the second sliding rod (354) is fixedly connected with the fourth base (31).

8. A printhead scanning motion based SLM device according to claim 6, characterized in that: the sixth driving module (322) and the seventh driving module (332) have the same structure, the sixth driving module (322) and the seventh driving module (332) both comprise a fifth motor (36), a fourth threaded rod (37), a first sliding block (38), a second sliding block (39) and a scissor mechanism (40), the fifth motor (36) is fixedly connected to a fourth base (31), an output shaft of the fifth motor (36) is fixedly connected with one end of the fourth threaded rod (37), the other end of the fourth threaded rod (37) is rotatably connected with the fourth base (31), the first sliding block (38) is slidably connected with the fourth base (31), a threaded hole is formed in the first sliding block (38), the first sliding block (38) is in threaded fit with the fourth threaded rod (37), one end of the bottom end of the scissor mechanism (40) is hinged to the first sliding block (38), and the other end of the bottom end of the scissor mechanism (40) is hinged to the fourth base (31), the second sliding block (39) of the sixth driving module (322) is in sliding connection with the forming substrate (321), the second sliding block (39) of the seventh driving module (332) is in sliding connection with the powder feeding substrate (331), one end of the top end of the scissors mechanism (40) is hinged to the second sliding block (39), the other end of the top end of the scissors mechanism (40) of the sixth driving module (322) is hinged to the forming substrate (321), and the other end of the top end of the scissors mechanism (40) of the seventh driving module (332) is hinged to the powder feeding substrate (331).

9. A printhead scanning motion based SLM device according to claim 6, characterized in that: the fifth driving module (35) comprises a sixth motor (71), a synchronous pulley group (72), a fifth threaded rod (73) and a third sliding rod (74), the sixth motor (71) is fixedly connected to the fourth base (31), the synchronous pulley group (72) comprises a first synchronous pulley (721) and a second synchronous pulley (722), the first synchronous pulley (721) is fixedly connected to an output shaft of the sixth motor (71), the second synchronous pulley (722) is fixedly connected to the fifth threaded rod (73), the first synchronous pulley (721) and the second synchronous pulley (722) are in transmission connection through a synchronous belt (723), the fifth threaded rod (73) is rotatably connected to the fourth base (31), a threaded hole is formed in one end of the sliding strip (34), one end of the sliding strip (34) is in threaded fit with the fifth threaded rod (73), and a through hole is formed in the other end of the sliding strip (34), the third sliding rod (74) penetrates through the through hole so that the other end of the sliding strip (34) is connected to the third sliding rod (74) in a sliding mode, and the third sliding rod (74) is fixedly connected with the fourth base (31).

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