CN108859107B - Powder filtering type laser in-situ forming device - Google Patents
Powder filtering type laser in-situ forming device Download PDFInfo
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- CN108859107B CN108859107B CN201810625716.9A CN201810625716A CN108859107B CN 108859107 B CN108859107 B CN 108859107B CN 201810625716 A CN201810625716 A CN 201810625716A CN 108859107 B CN108859107 B CN 108859107B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/10—Processes of additive manufacturing
- B29C64/141—Processes of additive manufacturing using only solid materials
- B29C64/153—Processes of additive manufacturing using only solid materials using layers of powder being selectively joined, e.g. by selective laser sintering or melting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/307—Handling of material to be used in additive manufacturing
- B29C64/314—Preparation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C64/00—Additive manufacturing, i.e. manufacturing of three-dimensional [3D] objects by additive deposition, additive agglomeration or additive layering, e.g. by 3D printing, stereolithography or selective laser sintering
- B29C64/30—Auxiliary operations or equipment
- B29C64/357—Recycling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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Abstract
The invention discloses a powder filtering type laser in-situ forming device, which comprises a frame, a spreading device for spreading metal powder, a laser system for selectively melting the metal powder and a driving mechanism for controlling the spreading device, wherein the spreading device is used for selectively melting the metal powder; the powder filtering type laser in-situ forming device has the advantages that the processing quality is guaranteed, processing failure caused by mixing of magazines is avoided, and particularly when excess materials are recycled.
Description
Technical Field
The invention relates to the field of laser printing, in particular to a powder filtering type laser in-situ forming device.
Background
The rapid prototyping technology is a novel manufacturing technology developed in the 80 s of the 20 th century, and the technology is a process of slicing a three-dimensional model of a part, stacking the three-dimensional model layer by layer and finally superposing the three-dimensional model into a three-dimensional solid part. The rapid prototyping technology breaks through the conventional idea of deformation prototyping and removal prototyping, and realizes the idea of 'net prototyping'. Rapid prototyping is mainly of 3 types: selective laser sintering technique SLS), laser cladding manufacturing technique (LENS), selective laser melting technique (SLM). The parts prepared by the selective laser melting technology have the advantages of high density, high precision, good performance and good stability in the processing process, and are concerned at home and abroad. Currently, SLM technology research is mainly focused on europe, such as germany, belgium, uk, etc. These countries have entered the commercialization phase in SLM device research. Asia is mainly focused in singapore, japan, etc.; in the prior art, generally, the lifting of a control platform is used for realizing the layered sequential descending of a powder layer, and the topmost layer is used as the next processing layer; the area of the platform is certain, the area corresponds to the bottom area of the processing area, and for the processed workpieces of different sizes, the volume of the processing area is unchanged, when small-size workpieces are processed, the space of the processing area still needs to be filled with powder, the processed raw materials are wasted in pollution, the raw materials are complicated in recovery and treatment, meanwhile, when large-size workpieces are processed, in-situ processing cannot be achieved through the technology, the processed workpieces need to be transported to a use place, the processing efficiency is low, the limitation is large, and the application range is limited.
Therefore, in order to solve the above problems, a selective laser melting system is needed, which can realize in-situ processing and manufacturing, effectively filter powder impurities, ensure powder paving quality and achieve good filtering effect.
Disclosure of Invention
In view of this, the present invention aims to overcome the defects in the prior art, and provides a powder filtering type laser in-situ forming device, which can effectively filter powder impurities, ensure powder paving quality, and has a good filtering effect.
The powder filtering type laser in-situ forming device comprises a frame, a spreading device for spreading metal powder, a laser system for selectively melting the metal powder, and a driving mechanism for controlling the spreading device to move up and down and move horizontally; the powder spreading device comprises a material spreading box, wherein a strip-shaped blanking port is arranged at the bottom of the material spreading box, an intermediate filter screen plate used for separating the inner cavity of the material spreading box into an upper cavity and a lower cavity is arranged in the material spreading box, a stirring mechanism is arranged in the upper cavity and comprises a powder driving rod, spiral blades are arranged on an excircle of the powder spreading box in the length direction, the powder driving rod comprises a left powder driving rod and a right powder driving rod which are arranged in parallel along the width direction of the material spreading box, the spiral direction of the spiral blade on the left powder driving rod is opposite to that of the spiral blade on the right powder driving rod, the powder spreading device further comprises a servo motor used for driving the left powder driving rod and the right powder driving rod, and an output shaft of the servo motor is in transmission fit with; the powder in the upper cavity is filtered by the middle filter screen plate after being stirred and then enters the lower cavity and further falls to the strip-shaped blanking port.
Furthermore, the number of the middle filter screen plates is two, and the two filter screen plates are arranged in parallel along the vertical direction and are detachably arranged.
Furthermore, a horizontal slot for detachably mounting the intermediate filter screen plate is arranged in the material spreading box, and the intermediate filter screen plate is inserted and mounted in the material spreading box through the horizontal slot.
Further, still including being used for retrieving the clout that the stone device spills to the clout recovery unit in the stone device.
Further, the excess material recovery device comprises an annular suction pipe and a suction pump, wherein the annular suction pipe is fixedly sleeved at the bottom of the processed workpiece, a suction port of the suction pump is communicated with the inner cavity of the annular suction pipe, and an outlet of the suction pump is matched with a common pipeline and the paving device and is used for conveying the excess material to the paving device for reuse.
Further, the side wall of the annular suction pipe is provided with a suction hole.
The invention has the beneficial effects that: according to the powder filtering type laser in-situ forming device disclosed by the invention, the middle filter screen plate for separating the inner cavity of the spreading box into the upper cavity and the lower cavity is arranged in the spreading box, the stirring mechanism is arranged in the upper cavity, and in the process of recovering excess materials, the cleanliness of powder is greatly improved, and the high processing quality is ensured.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic view of a driving structure of the powder laying box of the present invention;
FIG. 2 is a top view of the drive mechanism of the powder spreading box of the present invention;
FIG. 3 is a side view of the wedge of the present invention;
FIG. 4 is a schematic view of a connection structure of the powder laying box and a horizontal guide rail in the invention;
FIG. 5 is a schematic view of a driving structure of the powder laying box with electromagnetic positioning according to the present invention;
FIG. 6 is a schematic diagram of the driving structure of the electromagnetic driving block according to the present invention;
FIG. 7 is a schematic view of a driving structure of the powder laying box with hydraulic positioning according to the present invention;
FIG. 8 is a schematic structural view of the powder laying box of the present invention;
FIG. 9 is a schematic structural view of a stirring mechanism according to the present invention;
FIG. 10 is a side view of the recovery device of the present invention;
FIG. 11 is a top view of the recycling apparatus of the present invention;
FIG. 12 is a schematic view of the processing of a workpiece according to the present invention.
Detailed Description
As shown in the figure, the powder filtering type laser in-situ forming device in this embodiment includes a rack (not shown), a powder spreading device 1 for spreading metal powder, a laser system for selectively melting metal powder, and a driving mechanism for controlling the material spreading device to move up and down and horizontally, the driving mechanism includes a horizontal guide rail for supporting the powder spreading device 1 and a vertical driving mechanism for driving the horizontal guide rail to move vertically, a horizontal driving mechanism which is matched with the horizontal guide rail to drive the powder spreading device 1 to move horizontally and reciprocally is arranged on the powder spreading device 1, the laser system and the horizontal guide rail are relatively fixed, the laser is in the prior art, and details are not repeated herein; the horizontal guide rails are long and arranged transversely in the length direction, and the two horizontal guide rails (including a rear horizontal guide rail 2a and a front horizontal guide rail 2) are respectively positioned at two longitudinal sides of the powder paving device 1; the powder paving device 1 slides along the left and right direction (namely transverse direction) to realize powder paving under the drive of the horizontal driving motor, and the upper surface and the lower surface of the horizontal guide rail are provided with strip-shaped teeth, so that the stability of horizontal sliding is improved; the transverse direction represents the sliding direction of the powder laying device 1, and the longitudinal direction represents the length direction of the powder laying device 1, namely the direction perpendicular to the transverse direction in the horizontal plane; the horizontal guide rail, the powder spreading device and the laser system are arranged to be movable up and down, so that in-situ printing of products is realized when the products are prepared, for example, when large-scale products are prepared, the products can be prepared and used on site, the products are prevented from being carried, and particularly when the products are used indoors, the situation that the products cannot be carried in due to too small doorways is avoided.
In this embodiment, the horizontal driving mechanism includes a horizontal driving motor, a horizontal driving gear, and bar teeth disposed on the surface of the horizontal guide rail and engaged with the horizontal driving gear; the horizontal driving gear comprises an upper driving horizontal driving gear which is positioned on the upper side of the horizontal guide rail and is in meshing transmission with the horizontal guide rail and a lower driven horizontal driving gear which is positioned on the lower side of the horizontal guide rail and is in meshing transmission with the horizontal guide rail; an output shaft of the horizontal driving motor is in transmission fit with the upper driving horizontal driving gear, and the lower driven horizontal driving gear is rotatably arranged on the powder spreading device 1; mounting plates 19 are fixedly arranged at the longitudinal two end parts (and the two end parts in the front-back direction) of the powder spreading device 1, the mounting plates are horizontally arranged, the longitudinal outer end faces are recessed to form the horizontal guide grooves 3, horizontal driving wheel through holes are formed in the positions, close to the outer ends, of the mounting plates, the lower ends of the upper driving horizontal driving gears penetrate through the horizontal driving wheel through holes from top to be meshed with the strip-shaped teeth on the upper surface of the horizontal guide rail, and the upper ends of the lower driven horizontal driving gears penetrate through the horizontal driving wheel through holes from bottom to be meshed with the strip-shaped teeth on; the transmission stability of the whole horizontal transmission mechanism is greatly improved, and the high precision of the preparation process is ensured.
In the embodiment, the cross section of the horizontal guide rail is in a shape of a transverse convex with the top pointing to the inner side along the longitudinal direction, the upper surface and the lower surface of the inner side of the horizontal guide rail are respectively provided with a strip-shaped tooth, the upper surface and the lower surface of the outer side of the horizontal guide rail form a sliding limiting surface for horizontal movement, and the end part of the powder laying device 1 forms two inner side walls to form a horizontal guide groove 3 which is externally sleeved on the two sliding limiting surfaces 4; mounting plates are fixedly arranged at the longitudinal two end parts (namely the two end parts in the front-back direction) of the powder spreading device 1, the mounting plates are horizontally arranged, the longitudinal outer end faces are sunken to form horizontal guide grooves 3, horizontal driving wheel through holes are formed in the positions, close to the outer ends, of the mounting plates, the lower end of an upper driving horizontal driving gear 5 penetrates through the horizontal driving wheel through holes from top to be meshed with strip-shaped teeth on the upper surface of a horizontal guide rail, and the upper end of a lower driven horizontal driving gear 6 penetrates through the horizontal driving wheel through holes from bottom to be meshed with the strip-shaped teeth on the lower; the longitudinal outer end of the mounting plate is the end which is close to the horizontal guide rail along the longitudinal direction, otherwise, the longitudinal outer end is the inner end, the stability of the movement process of the powder laying device is guaranteed, and the mounting plate can be made of wear-resistant materials.
In this embodiment, the vertical driving mechanism includes a left wedge-shaped seat and a right wedge-shaped seat (including a left wedge-shaped seat 7 and a right wedge-shaped seat 8) which are located at two ends of the horizontal guide rail and have right-angled triangle longitudinal sections, and a wedge-shaped seat driving assembly for driving the left wedge-shaped seat and the right wedge-shaped seat to slide along a transverse single degree of freedom; the two ends of the horizontal guide rail are respectively provided with a left roller 9a and a right roller 9, the left roller is pressed against the driving inclined surface of the left wedge-shaped seat, the right roller is pressed against the driving inclined surface of the right wedge-shaped seat, and the wedge-shaped seat driving assembly is used for driving the left wedge-shaped seat and the right wedge-shaped seat to mutually approach or keep away from each other so as to realize the ascending or descending of the horizontal guide rail; the vertex angle of the left wedge-shaped seat and the right wedge-shaped seat is 3-8 degrees; the optimal selection is 5 degrees, so that the lifting speed and the lifting precision are balanced; through controlling the distance between the left and right wedge-shaped seats, and then through the extrusion on left and right wedge-shaped seat inclined planes, the vertical driving of horizontal guide rail is formed, and the control precision and the stability of the vertical motion of the powder paving device 1 are improved.
In this embodiment, the vertical driving mechanism further includes a vertical guide post 10 fixed to the frame, the vertical guide post is horizontally located in the middle of the horizontal guide rail, the vertical guide post is vertically provided with a vertical guide groove 11, and a vertical guide block 12 which is fittingly embedded into the vertical guide groove is formed by protruding the longitudinal outer side of the horizontal guide rail; through the setting of vertical guide way, very big improvement the accuracy nature and the stability of horizontal guide rail vertical motion, improve the control accuracy of shop's powder device 1 greatly, guarantee that the machining precision is high.
In this embodiment, the horizontal guide rail includes a front horizontal guide rail 2 and a rear horizontal guide rail 2a which are longitudinally distributed in a front-back direction, the front horizontal guide rail 2 and the rear horizontal guide rail 2a are both located between the left and right wedge-shaped seats, the inclined surfaces of the left and right wedge-shaped seats are provided with four sliding guide grooves 13 which are respectively corresponding to two ends of the front horizontal guide rail 2 and two ends of the rear horizontal guide rail 2a, and the sliding guide grooves are arranged along the direction of the inclined edge of the longitudinal section corresponding to the left and right wedge-shaped seats; further improve the motion stability of horizontal guide rail, avoid unnecessary moment to produce.
In this embodiment, the wedge seat driving assembly includes a wedge seat driving motor 14 and a driving screw in transmission fit with an output shaft of the wedge seat driving motor, the bottoms of the left and right wedge seats are respectively provided with a left driving screw hole and a right driving screw hole in a direction opposite to the rotation direction of the left driving screw hole, an outer circle of the driving screw is sequentially provided with a first outer thread section in threaded fit with the left driving screw hole and a second outer thread section in threaded fit with the right driving screw hole along the axial direction, and the wedge seat driving motor realizes mutual approaching or distancing between the left and right wedge seats by driving the driving screw to rotate forward or backward; through setting up left side drive screw and right drive screw to same pitch and pitch value less, do benefit to and improve the drive accuracy, the drive is smooth and easy, and structural stability is good.
In this embodiment, the driving screw includes a front driving screw 15 and a rear driving screw 16 which are longitudinally arranged in front and rear, an output shaft of the wedge seat driving motor is located between ends of the front driving screw and the rear driving screw at the same side, the bottom of the wedge seat is longitudinally and correspondingly provided with a front driving screw hole and a rear driving screw hole (for example, the bottom of the left wedge seat is provided with a front driving screw hole 20 and a rear driving screw hole 21), an output shaft fixing sleeve of the wedge seat driving motor is provided with a power output gear 17, ends of the front driving screw and the rear driving screw are respectively fixedly sleeved with power input gears, and the power output gear is engaged with the two power input gears 18 and transmits power in a speed reduction manner; the diameter of the power output gear is larger than the radius of the power input and output gear, the structure is simple and compact, power is transmitted through speed reduction, torque is improved, driving is guaranteed, and meanwhile high sliding precision of the left wedge-shaped seat and the right wedge-shaped seat is guaranteed.
In this embodiment, the bottom of the rack is provided with a transverse guide groove for guiding the left and right wedge-shaped seats in the transverse direction, the bottoms of the left and right wedge-shaped seats are provided with transverse guide blocks which are embedded into the transverse guide groove in a form-fitting manner, and the transverse guide groove and the vertical guide groove are dovetail grooves; smooth sliding and stable structure.
In this embodiment, a walking mechanism capable of being locked is arranged at the bottom of the rack; the running mechanism is a roller, the roller is provided with an existing locking mechanism, the rack is guaranteed to be easy to move, and the machine is suitable for in-situ processing.
Certainly, when the whole device is used, an outer cover is matched with the sealing cover which is arranged on the whole device and has a closed bottom opening and a closed bottom surface, and the sealing cover can be a transparent and telescopic cover body, so that the sealing cover is beneficial to vacuumizing and introducing inert gas for processing when in use.
In this embodiment, the horizontal guide rail is provided with an electromagnetic pressing force vertically downwards, and the electromagnetic pressing mechanism is used for providing the electromagnetic pressing force, the electromagnetic pressing mechanism comprises a pressing block 23 which is vertically arranged in a single-free sliding manner, and an electromagnetic driving block 22 which is positioned above the pressing block and is vertically arranged in a single-free sliding manner in a fixed and adjustable manner, the pressing block is a permanent magnet, an electromagnetic coil is arranged in the electromagnetic driving block, and the electromagnetic coil can generate an electromagnetic field which is used for driving the permanent magnet to move downwards to press the horizontal guide rail; certainly, the battery coil is connected with the electric control module through an external wire, the electric control module controls the current magnitude and direction of the electromagnetic coil, and further controls the pressing force of the pressing block, and the structure is simple and compact; the electric control module belongs to the prior art and is not described in detail herein.
In this embodiment, the electromagnetic pressing mechanism further includes a fixed chain for adjusting the height of the electromagnetic driving block, the fixed chain 26 is vertically movably disposed through the upper supporting gear 24 and the lower supporting gear 25, a locking mechanism is disposed on the fixed chain, and the electromagnetic driving block is fixed to the fixed chain and can vertically move in a manner of being locked with the fixed chain; do benefit to the vertical position of fixed chain control electromagnetic drive piece, guarantee that the vertical interval of electromagnetic drive piece and compact heap is suitable, when guaranteeing to compress tightly, electromagnetic hold-down mechanism's vertical height is lower.
In another embodiment, the hydraulic pressing device further comprises a hydraulic pressing component for applying downward hydraulic pressing force to the horizontal guide rail, the hydraulic pressing component comprises a hydraulic pump 27, a hydraulic cylinder, a return pipe 31 and an oil storage bin, an oil outlet of the hydraulic pump is communicated with a driving inner cavity of the hydraulic cylinder 29 through an oil pipe 28 and drives a hydraulic rod of the hydraulic cylinder to press the horizontal guide rail downward, an oil inlet of the hydraulic pump is communicated with the oil storage bin through a pipeline, the return pipe is provided with an electromagnetic valve 30 for controlling the on-off of the return pipe, one end of the return pipe is communicated with the driving inner cavity of the hydraulic cylinder, and the other end of; the hydraulic pump generates continuous and large pressing force to the hydraulic rod (the end part of the hydraulic rod is fixedly provided with the pressing block 30), when the horizontal guide rail needs to be lifted, the electromagnetic valve arranged on the return pipe can be controlled to be opened, the pressure relief of the driving inner cavity of the hydraulic cylinder is facilitated, the lifting of the hydraulic rod is facilitated, and after the lifting operation of the horizontal guide rail is completed, the electromagnetic valve is closed, so that the driving inner cavity of the hydraulic cylinder generates high pressure, and the vertical pressing of the hydraulic rod on the horizontal guide rail is ensured.
In the embodiment, the powder spreading device comprises a powder spreading box 31 with a powder falling port at the bottom and a powder scraping knife 32 arranged at the transverse middle position of the powder falling port, the powder scraping knife divides the powder falling port into a left powder falling port 34 and a right powder falling port 35, and a sealing device for selectively sealing the left powder falling port 34 or the right powder falling port 35 is arranged at the upper end of the powder falling port; the sealing device is controlled to be rotationally opened to form a left powder falling port or a right powder falling port, so that the powder spreading device can be used for realizing bidirectional powder spreading; the efficiency of shop's powder can be effectively improved, the powder fineness of shop is guaranteed, simple structure simultaneously, and the function is smooth and easy, and the fault rate is little.
In the embodiment, the sealing device comprises a turning plate 33 hinged to the top end of the air scraping knife and a turning plate driving motor for driving the turning plate to rotate, and the turning plate driving motor is used for driving the turning plate to rotate forwards or reversely to seal the right powder falling port or the left powder falling port; the structure is simple and compact, and the realization is easy; the turnover plate is a long strip-shaped plate, certainly, a sealing strip can be arranged on the rotating outer side edge of the turnover plate, and the sealing strip and the inner side wall of the powder spreading box form sealing after the turnover plate rotates, so that the turnover plate is simple in structure and convenient to control.
In this embodiment, a discharging roller 36 is further arranged above the turning plate in a manner of rotating around the central axis of the turning plate, a left discharging gap and a right discharging gap are arranged between the outer circle of the discharging roller and two transverse inner side walls of the powder spreading box and respectively correspond to the left discharging port and the right discharging port, and the powder spreading device further comprises a discharging roller driving motor for driving and controlling the forward rotation speed or the reverse rotation speed of the discharging roller; the transverse section of the powder laying box comprises an upper rectangular section, a middle inverted trapezoidal section and a lower rectangular section from top to bottom, the width of the upper rectangular section is larger than that of the lower rectangular section, the middle inverted trapezoidal section is an isosceles trapezoid with an upper bottom larger than a lower bottom, the discharging roller 36 is arranged at the upper end of the lower rectangular section, the turning plate is arranged at the lower end of the lower rectangular section, and the bottom of the powder scraping knife 32 penetrates out of the lower rectangular section.
In the embodiment, the powder spreading box is internally provided with the stirring mechanism which is used for enabling the powder to form bidirectional circulating flow in the powder spreading box along the length direction of the powder spreading box, so that the powder in the powder spreading device can be uniformly stirred, the smooth powder spreading is ensured, and the quick and accurate powder spreading is facilitated; the structure is simple and compact, and the integral lifting is facilitated; the stirring mechanism is arranged in the rectangular section on the powder laying box;
the stirring mechanism comprises a powder driving rod, a servo motor and a stirring mechanism, wherein the powder driving rod is provided with a helical blade 39 along the excircle arranged in the length direction of the powder spreading box, the powder driving rod comprises a left powder driving rod 37 and a right powder driving rod 38 which are arranged in parallel along the width direction of the powder spreading box, the helical blade positioned on the left powder driving rod and the helical blade positioned on the right powder driving rod have opposite rotation directions, the servo motor is used for driving the left powder driving rod and the right powder driving rod, and the output shaft of the servo motor is in transmission fit with the left powder driving rod and the right powder driving rod through a transmission chain; is beneficial to forming effective flow in a small space and ensures uniform stirring.
In the embodiment, an intermediate filter screen plate for dividing an inner cavity of the spreading box into an upper cavity and a lower cavity is arranged in the spreading box, a stirring mechanism is arranged in the upper cavity, and powder in the upper cavity is stirred, filtered by the intermediate filter screen plate, enters the lower cavity and further falls to the strip-shaped blanking port; through be provided with in the stone box and be used for separating into the middle filter screen board of epicoele and lower chamber with the stone box inner chamber, be provided with rabbling mechanism in the epicoele, there is the process that the clout was retrieved, improves the cleanliness factor of powder greatly, guarantees that the processing quality is high.
In this embodiment, the number of the middle filter screen plates is two (including an upper middle filter screen plate 40 and a lower middle filter screen plate 41), and the two filter screen plates are vertically arranged in parallel in a detachable manner; the middle filter screen plate of the flanging is replaced on line, and only one middle filter screen plate is used during normal use.
In the embodiment, a horizontal slot for detachably mounting an intermediate filter screen plate is arranged in the material spreading box, and the intermediate filter screen plate is inserted and mounted in the material spreading box through the horizontal slot; the middle filter screen plate is convenient to assemble and disassemble, and the operation efficiency is improved.
In the embodiment, the device also comprises a residual material recovery device which is used for recovering residual materials scattered by the spreading device into the spreading device; the metal powder excess material is effectively recycled, the material waste is avoided, the material reciprocating use is facilitated, the system volume is effectively reduced, the movement is convenient, and the manufacturing cost is saved.
In this embodiment, the excess material recycling device comprises an annular suction pipe 43 fixedly sleeved at the bottom of the processed workpiece 42 and a suction pump 44 with a suction port communicated with an inner cavity of the annular suction pipe, and an outlet of the suction pump 44 is matched with the spreading device through a pipeline and used for conveying excess material to the spreading device for reuse; the side wall of the annular suction pipe is provided with a suction hole; carry out abundant recovery to the clout, the annular suction tube does benefit to and sucks the powder that the work piece lateral wall dropped, realizes recycle, avoids the powder of retrieving to be polluted simultaneously.
In this embodiment, a suction tip tube 45 is communicated with the suction hole, and the suction tip tube is a flexible tube; the suction hole sets up for a plurality of and one-to-one with the suction front end pipe, and suction hole sets up along annular suction tube circumference with the suction front end pipe, sets up to pliability pipe through with the suction front end pipe, does benefit to the shape according to the work piece and conforms the suction mouth position of adjusting each suction front end pipe, guarantees that suction efficiency is high.
In this embodiment, the top cover of the powder spreading box is an inclined filter screen-shaped cover plate, and the filter screen-shaped cover plate is used for rough filtering of powder entering the powder spreading box; the export of suction pump 44 sprays the inclined plane that direction level set up and just to filter screen form apron, realizes quick filtration, and the jet force of suction pump export can avoid impurity to pile up on filter screen form apron and cause the shutoff simultaneously.
The embodiment also discloses a selective laser melting method, which comprises the following steps:
(1) spreading a layer of metal powder on the substrate by using a selective laser melting system;
(2) laser melting is carried out on the current-layer metal powder in the step (1) according to the size of a processed workpiece to form an outer ring layer b;
(3) laser melting is carried out in the outer ring layer in the step (2) to form a processed workpiece sheet layer a;
(4) and (3) paving a layer of metal powder on the outer ring layer and the processed workpiece layer by using a powder paving device, and circularly repeating the step (2) and the step (3) until the processed workpiece is integrally finished.
In the embodiment, in the step (2), the width of the loop line of the outer ring layer is 5-1.5 mm; preferably 1 mm.
In the embodiment, in the step (2), the minimum distance between the inner circle of the outer ring layer and the processed workpiece along the radial direction is 10-15 mm; preferably 12 mm.
In this embodiment, in steps (1) to (4), the processing apparatus and the workpiece are sealed by a cover, and an inert gas is introduced into the cover.
The selective laser melting system in the selective laser melting method is the selective laser melting system with the structure.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (5)
1. The utility model provides a powder filtration type laser normal position forming device which characterized in that: the device comprises a frame, a spreading device for spreading metal powder, a laser system for selectively melting the metal powder, and a driving mechanism for controlling the spreading device to move up and down and horizontally; the powder spreading device comprises a material spreading box, wherein a strip-shaped blanking port is arranged at the bottom of the material spreading box, an intermediate filter screen plate used for separating the inner cavity of the material spreading box into an upper cavity and a lower cavity is arranged in the material spreading box, a stirring mechanism is arranged in the upper cavity and comprises a powder driving rod, spiral blades are arranged on an excircle of the powder spreading box in the length direction, the powder driving rod comprises a left powder driving rod and a right powder driving rod which are arranged in parallel along the width direction of the material spreading box, the spiral direction of the spiral blade on the left powder driving rod is opposite to that of the spiral blade on the right powder driving rod, the powder spreading device further comprises a servo motor used for driving the left powder driving rod and the right powder driving rod, and an output shaft of the servo motor is in transmission fit with; powder in the upper cavity is filtered by the middle filter screen plate after being stirred, enters the lower cavity and further falls to the strip-shaped blanking port; the two middle filter screen plates are arranged in parallel along the vertical direction and are detachably arranged; a horizontal slot for detachably mounting the intermediate filter screen plate is formed in the material spreading box, and the intermediate filter screen plate is inserted and mounted in the material spreading box through the horizontal slot; the spreading device is provided with a horizontal driving mechanism which is matched with the horizontal guide rail to drive the spreading device to horizontally reciprocate, and the horizontal driving mechanism comprises a horizontal driving motor, a horizontal driving gear and strip-shaped teeth which are arranged on the surface of the horizontal guide rail and are meshed with the horizontal driving gear; the horizontal driving gear comprises an upper driving horizontal driving gear which is positioned on the upper side of the horizontal guide rail and is in meshing transmission with the horizontal guide rail and a lower driven horizontal driving gear which is positioned on the lower side of the horizontal guide rail and is in meshing transmission with the horizontal guide rail; the lower driven horizontal driving gear is rotatably arranged on the powder spreading device; mounting plates are fixedly arranged at the two longitudinal end parts of the powder spreading device, the mounting plates are horizontally arranged, the outer end faces of the mounting plates in the longitudinal direction are recessed to form horizontal guide grooves, horizontal driving wheel through holes are formed in the positions, close to the outer ends, of the mounting plates, the lower ends of the upper driving horizontal driving gears penetrate into the horizontal driving wheel through holes from top to be meshed with strip-shaped teeth on the upper surface of the horizontal guide rail, and the upper ends of the lower driven horizontal driving gears penetrate into the horizontal driving wheel through holes from bottom to be meshed with the strip-shaped teeth on the; the upper surface and the lower surface of the horizontal guide rail are both provided with strip-shaped teeth, and the upper surface and the lower surface of the outer side of the horizontal guide rail form a sliding limiting surface for horizontal movement.
2. The powder filter type laser in-situ forming device according to claim 1, wherein: still including being used for retrieving the clout that the stone device is unrestrained to the stone device in clout recovery unit.
3. The powder filter type laser in-situ forming device according to claim 2, wherein: the excess material recovery device comprises an annular suction pipe and a suction pump, wherein the annular suction pipe is fixedly sleeved at the bottom of a processed workpiece, a suction port is communicated with the inner cavity of the annular suction pipe, and the outlet of the suction pump is matched with a common pipeline and a paving device and is used for conveying excess material to the paving device for reuse.
4. The powder filter type laser in-situ forming device according to claim 3, wherein: the side wall of the annular suction pipe is provided with a suction hole.
5. The powder filter type laser in-situ forming device according to claim 4, wherein: the suction hole is communicated with a suction front end pipe which is a flexible pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810625716.9A CN108859107B (en) | 2018-06-18 | 2018-06-18 | Powder filtering type laser in-situ forming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810625716.9A CN108859107B (en) | 2018-06-18 | 2018-06-18 | Powder filtering type laser in-situ forming device |
Publications (2)
| Publication Number | Publication Date |
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| CN108859107A CN108859107A (en) | 2018-11-23 |
| CN108859107B true CN108859107B (en) | 2020-12-04 |
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| CN201810625716.9A Active CN108859107B (en) | 2018-06-18 | 2018-06-18 | Powder filtering type laser in-situ forming device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204122757U (en) * | 2014-10-27 | 2015-01-28 | 湖北工业大学 | A kind of powder automatic circulating system of laser 3D printer |
| CN104625062B (en) * | 2015-03-03 | 2016-10-05 | 重庆大学 | Reciprocal power spreading device for selective laser melting |
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Effective date of registration: 20201119 Address after: 325000 room 104, No. 6, Lane 93, Lucheng Road, Shuixin street, Lucheng District, Wenzhou City, Zhejiang Province Applicant after: Zheng Duoduo Address before: 402247 No. 401 Fuyun Avenue, Shuang Fu Street, Jiangjin District, Chongqing, 3 No. 9-4 Applicant before: CHONGQING ENGUANG TECHNOLOGY Co.,Ltd. |
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