Selective laser melting forming equipment

Abstract

The invention relates to selective laser melting forming equipment, belongs to the technical field of additive manufacturing, and solves the problems that in the prior art, when a scraper device is replaced, the scraper device is independently adjusted to be parallel to a powder laying plane, and the leveling process consumes a long time. The powder spreading device comprises a printing cabin, a powder spreading guide rail, a powder spreading plane and a powder spreading device, the powder laying guide rails are arranged on the two side walls of the printing cabin. The powder laying plane is located on the lower end face of the printing cabin. The two ends of the powder laying device are movably arranged on the powder laying guide rails. Wherein the powder spreading device is provided with a scraper device, and the scraper device is parallel to the powder spreading plane. The scraper device is arranged on the powder laying device, the scraper device completes initial positioning on the basis of the powder laying device, then accurate positioning is completed through the leveling assembly, and in the using process, the scraper can be rapidly leveled, and time is saved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a laser selective melting forming device. Background Art

[0002] Laser selective melting forming technology selectively irradiates pre-spread metal powder by focusing a fine laser light source, and stacks it layer by layer into three-dimensional metal parts. Compared with traditional casting and forging technology, laser selective melting forming technology can obtain rapidly solidified non-equilibrium structure, small internal grains, excellent comprehensive mechanical properties, and can form parts with any complex structure. It provides new ideas for lightweight aircraft structure, topological optimization design and manufacturing, and has become an important development direction for advanced manufacturing in the aerospace field.

[0003] In the use of traditional laser selective melting forming equipment, the scraper needs to be replaced frequently before or during printing. After replacement, the scraper needs to be adjusted to be parallel to the printing surface. This process is time-consuming and affects work efficiency. Summary of the invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a laser selective melting forming device to solve the technical problem in the prior art that when replacing the scraper device, the scraper device must be independently adjusted to make it parallel to the powder spreading plane, and the leveling process takes a long time.

[0005] The present invention provides a laser selective melting forming device, comprising a printing chamber, a powder spreading guide rail, a powder spreading plane, and a powder spreading device; the powder spreading guide rail is arranged on two side walls of the printing chamber; the powder spreading plane is located at the lower end surface of the printing chamber; the two ends of the powder spreading device are movably arranged on the powder spreading guide rail;

[0006] Wherein, a scraper device is arranged on the powder spreading device, and the scraper device is arranged parallel to the powder spreading plane.

[0007] Furthermore, the powder spreading device includes a main body.

[0008] Furthermore, a powder receiving groove and a scraper mounting groove are provided on the main body.

[0009] Furthermore, the powder spreading device also includes powder spreading vehicle hanging ears arranged at both ends of the main body.

[0010] Furthermore, the scraper device is arranged in the scraper mounting groove.

[0011] Furthermore, the scraper device includes a trapezoidal scraper, a scraper frame, a scraper pressure plate, a scraper ear, a scraper frame support plate, a photoelectric sensor and a leveling assembly; the trapezoidal scraper is arranged on the lower end surface of the scraper frame; the scraper frame is arranged on the lower end surface of the scraper pressure plate; the scraper ear is arranged on the left and right ends of the scraper pressure plate; the scraper frame support plate is arranged on the upper end surface of the scraper ear.

[0012] Furthermore, the number of the leveling components is 2.

[0013] Furthermore, the leveling assembly includes a leveling screw and a compression spring.

[0014] Furthermore, a second accommodating groove is provided at a position of the scraper mounting groove corresponding to the leveling screw.

[0015] Furthermore, a first accommodating groove is provided at a position of the scraper mounting groove corresponding to the compression spring.

[0016] Furthermore, it also includes a transmission part and a scraper cleaning device.

[0017] Further, the transmission part includes a first transmission member, a second rotating member and a first groove arranged on the inner wall of the printing chamber, the first groove is arranged between the first transmission member and the second transmission member; the first transmission member includes a first plate body arranged horizontally and a first rack arranged on the lower end surface of the first plate body, the second transmission member includes a second plate body arranged horizontally and a second rack arranged on the upper end surface of the second plate body, the first rack and the second rack are arranged opposite to each other;

[0018] The scraper cleaning device includes a first rod, a gear, a clockwork mechanism, a transmission mechanism, a sliding rod assembly, a slider and a wiping member; one end of the first rod is rotatably arranged in the first groove through a bearing, the other end of the first rod is arranged on one end face of the gear, and the clockwork mechanism is arranged on the other end face of the gear; the gear is arranged between the first rack and the second rack, and the gear is meshed with the first rack and the second rack.

[0019] The clockwork mechanism comprises a clockwork box, a clockwork belt and a clockwork shaft; the clockwork box has a storage space for accommodating the clockwork belt, the clockwork belt is arranged in the clockwork box, one end of the clockwork belt is fixed to the inner wall of the clockwork box, and the other end of the clockwork belt is arranged on the clockwork shaft; a through hole is opened on the clockwork box, the clockwork shaft passes through the through hole and is arranged on the gear, and the clockwork shaft rotates with the gear, thereby tightening the clockwork belt and storing energy;

[0020] The slide bar assembly is arranged at the output end of the first rotating shaft; the slide bar assembly includes a second rod and a sleeve, and the sleeve sleeve is arranged on the second rod; the second rod is parallel to the powder spreading device and is arranged opposite to the trapezoidal scraper; a second groove begins to be formed on the side wall surface of the second rod; the sliding block is arranged in the second groove, and the wiping member is arranged on the sliding block.

[0021] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0022] (1) The method described above is applied to laser selective melting forming equipment, and can realize rapid leveling of the scraper assembly through components such as compression springs, leveling screws and photoelectric sensors. The operation is simple and can improve the production efficiency of the laser selective melting forming equipment in continuous operation.

[0023] (2) When replacing the scraper of the present invention, there is no need to disassemble the entire device, design a leveling tool separately, or install a series of servo motors on the scraper device or various sensors in the printing chamber during the leveling process. Only the scraper assembly needs to be removed and replaced, which makes it more convenient to use and maintain, saving costs and greatly reducing the time for replacing the scraper.

[0024] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0026] Figure 1 It is a structural schematic diagram of the laser selective melting forming equipment described in Example 1;

[0027] Figure 2 It is a schematic structural diagram of a powder spreading device and a powder spreading vehicle hanging ear in the laser selective melting forming equipment described in Example 1;

[0028] Figure 3 It is a schematic structural diagram of a scraper device in the laser selective melting forming equipment described in Example 1;

[0029] Figure 4 This is a schematic structural diagram of the main body of the laser selective melting forming equipment described in Example 1;

[0030] Figure 5This is a schematic diagram of the assembly of the fastening screws in the laser selective melting forming equipment described in Example 1;

[0031] Figure 6 It is a structural schematic diagram of the laser selective melting forming equipment described in Example 2;

[0032] Figure 7 It is a structural schematic diagram of a scraper cleaning device in the laser selective melting forming equipment described in Example 2;

[0033] Figure 8 It is a schematic structural diagram of the clockwork mechanism and the rotating assembly in the laser selective melting forming equipment described in Example 2;

[0034] Fig. 9 It is a structural schematic diagram of the transmission mechanism in the laser selective melting forming equipment described in Example 2;

[0035] Fig.10 It is a schematic structural diagram of the second rod in the laser selective melting forming device described in Example 2;

[0036] Fig.11 It is a schematic structural diagram of a sleeve in the laser selective melting forming equipment described in Example 2;

[0037] Fig.12 It is a schematic structural diagram of a scraper cleaning device and a mixing assembly in the laser selective melting forming equipment described in Example 2;

[0038] Fig.13 This is a schematic diagram of the structure of a mixing component in the laser selective melting forming equipment described in Example 2;

[0039] Fig.14 This is a schematic diagram of the structure of the wiper in the laser selective melting forming equipment described in Example 2.

[0040] Reference numerals:

[0041] 1-printing cabin; 2-powder spreading guide rail; 3-powder spreading plane; 4-powder spreading device; 41-main body; 411-powder spreading accommodating groove; 412-scraper installation groove; 4121-first accommodating groove; 4122-second accommodating groove; 42-scraper device; 421-trapezoidal scraper; 422-scraper holder; 423-scraper pressure plate; 424-scraper hanging ear; 425-scraper holder support plate; 426-photoelectric sensor; 427-leveling assembly; 4271-leveling screw; 4272-compression spring; 5-powder spreading vehicle hanging ear; 6-fastening screw; 7-transmission part; 71-first transmission member; 711-first plate body; 712-first rack; 72-second rotating member; 721-second plate body; 722-second rack; 73-first groove; 8-scraper cleaning device; 81-gear; 82-clockwork mechanism; 821-clockwork box; 822-clockwork belt; 823-clockwork shaft; 83-transmission mechanism; 831-rotating assembly; 8311-first rotating disk; 8312-sliding groove; 8313-spring; 8314-wedge block; 8315-second rotating disk; 832-first rotating shaft; 833-transmission belt; 834-second rotating shaft; 84-sliding rod assembly; 841-second rod; 842-second groove; 843-sleeve; 844-through groove; 85-slider; 86-wiping piece; 861-first cleaning sub-component; 8611-wiping groove; 862-second cleaning sub-component; 87-first rod; 9-mixing assembly; 91-gantry; 92-mixing piece. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0043] Example 1

[0044] The present invention provides a laser selective melting forming device, such as Figure 1 As shown, the device comprises a printing chamber 1, a powder spreading guide rail 2, a powder spreading plane 3 and a powder spreading device 4. The powder spreading guide rail 2 is arranged on two side walls of the printing chamber 1; the powder spreading plane 3 is located at the lower end surface of the printing chamber 1; and both ends of the powder spreading device 4 are movably arranged on the powder spreading guide rail 2.

[0045] like Figure 2 As shown, the powder spreading device 4 includes a main body 41; the powder spreading vehicle hanging ears 5 are arranged at both ends of the main body 41, and the powder spreading vehicle hanging ears 5 can be movably arranged on the powder spreading guide rail 2; the main body 41 includes a powder spreading accommodating groove 411 and a scraper mounting groove 412.

[0046] The powder spreading device 4 also includes a scraper device 42 disposed in the scraper mounting groove 412. Figure 3 As shown, the scraper device 42 includes a trapezoidal scraper 421 , a scraper frame 422 , a scraper pressure plate 423 , a scraper hanging ear 424 , a scraper frame support plate 425 , a photoelectric sensor 426 and a leveling component 427 .

[0047] The trapezoidal scraper 421 is arranged on the lower end surface of the scraper frame 422; the scraper frame 422 is arranged on the lower end surface of the scraper pressing plate 423; the scraper hanging ears 424 are arranged on the left and right ends of the scraper pressing plate 423; the scraper frame support plate 425 is arranged on the upper end surface of the scraper hanging ears 424; the scraper hanging ears 424 are provided with a first through hole, and the scraper frame support plate 425 is provided with a second through hole at a position corresponding to the first through hole; Figure 4 As shown, a first accommodating groove 4121 and a second accommodating groove 4122 are provided at positions on the scraper mounting groove 412 corresponding to the first through hole, and the first accommodating groove 4121 and the second accommodating groove 4122 are connected; the compression spring 4272 is arranged in the first accommodating groove 4121 .

[0048] like Figure 3 and Figure 4 As shown, the number of the leveling components 427 is two, and the two leveling components 427 are respectively located at the left and right ends of the scraper support plate 425; the leveling component 427 includes a leveling screw 4271 and a compression spring 4272; the upper end of the leveling screw 4271 is fixed to the scraper support plate 425, and the lower end of the leveling screw 4271 sequentially passes through the first through hole, the second through hole and the compression spring 4272 to extend into the second accommodating groove 4122, and the through hole By tightening the leveling screw 4271 downward, a downward force is applied to the scraper ear 424, the scraper pressure plate 423, the scraper frame 422 and the trapezoidal scraper 421 in turn, and the height of the end of the trapezoidal scraper 421 corresponding to the leveling screw 4271 is adjusted; the two leveling components 427 at the left and right ends of the scraper frame support plate 425 are adjusted to adjust the distance between the left and right ends of the trapezoidal scraper 421 and the powder spreading plane 3, so as to achieve the effect of making the plane where the active end of the trapezoidal scraper 421 is located parallel to the powder spreading plane 3.

[0049] There are two photoelectric sensors 426 , which are arranged on the side walls of the scraper frame 422 and at the left and right ends of the scraper frame 422 ; the photoelectric sensor 426 is used to detect the distance value between the position of the photoelectric sensor 426 and the powder laying plane 3 .

[0050] The scraper installation groove 412 is a structure with upper and lower openings.

[0051] like Figure 5As shown, in the embodiment, the scraper device 42 is clamped in the scraper mounting groove 412, and the scraper mounting groove 412 is provided with a fixing through hole. After the leveling assembly 427 and the photoelectric sensor 426 complete the horizontal adjustment of the trapezoidal scraper 421, the scraper device 42 is fixed to the fixing through hole by using the fastening screw 6.

[0052] When the working end of the trapezoidal scraper 421 is worn and the metal powder cannot be evenly spread on the powder spreading plane 3, the working performance of the trapezoidal scraper 421 decreases and the scraper needs to be replaced. In this embodiment, the fastening screw 6 can be loosened, the scraper device 42 can be taken out of the scraper mounting groove 412 as a whole, and the scraper device 42 can be replaced as a whole; or only the trapezoidal scraper 421 can be replaced. The operation steps of replacing the scraper are few, the time is short, and the normal operation of the laser selective melting forming equipment is not affected.

[0053] A through hole structure is formed at a position of the scraper installation groove 412 corresponding to the photoelectric sensor 426 .

[0054] The laser selective melting forming equipment described in this embodiment is in operation, and metal powder is placed in the powder-laying receiving groove 411; the trapezoidal scraper 421 is adjusted to be parallel to the powder-laying plane 3 using the photoelectric sensor 426 and the leveling assembly 427; the driving device drives the powder-laying device 4 to reciprocate on the powder-laying guide rail 2, and during the movement, the output end at the lower end of the powder-laying receiving groove 411 is opened, and the metal powder is discharged from the output end to the powder-laying plane 3, and the active end of the trapezoidal scraper 421 sweeps over the upper end surface of the metal powder laid on the powder-laying plane 3 to flatten the un-laid metal powder.

[0055] Example 2

[0056] The laser selective melting forming equipment described in this embodiment is as follows: Figure 6 As shown, based on the first embodiment, it further includes a transmission part 7 and a scraper cleaning device 8.

[0057] The transmission part 7 includes a first transmission member 71, a second rotating member 72 and a first groove 73 arranged on the inner wall of the printing chamber 1, and the first groove 73 is arranged between the first transmission member 71 and the second transmission member; the first transmission member 71 includes a horizontally arranged first plate body 711 and a first rack 712 arranged on the lower end surface of the first plate body 711, and a plurality of first racks 712 are linearly arranged on the first plate body 711; the second transmission member includes a horizontally arranged second plate body 721 and a second rack 722 arranged on the upper end surface of the second plate body 721, and a plurality of second racks 722 are linearly arranged on the second plate body 721, and the first rack 712 and the second rack 722 are relatively arranged.

[0058] like Figure 7 As shown, the scraper cleaning device 8 includes a first rod 87, a gear 81, a spring mechanism 82, a transmission mechanism 83, a slide rod assembly 84 and a slider 85; one end of the first rod 87 is rotatably arranged in the first groove 73 through a bearing, the other end of the first rod 87 is arranged on one end face of the gear 81, and the spring mechanism 82 is arranged on the other end face of the gear 81; the gear 81 is arranged between the first rack 712 and the second rack 722, and the gear 81 is meshed with the first rack 712 and the second rack 722.

[0059] like Figure 8 As shown, the clockwork mechanism 82 includes a clockwork box 821, a clockwork belt 822 and a clockwork shaft 823; the clockwork box 821 has a storage space for accommodating the clockwork belt 822, the clockwork belt 822 is arranged in the clockwork box 821, one end of the clockwork belt 822 is fixed to the inner wall of the clockwork box 821, and the other end of the clockwork belt 822 is arranged on the clockwork shaft 823; a through hole is opened on the clockwork box 821, and the clockwork shaft 823 passes through the through hole and is arranged on the gear 81, and the clockwork shaft 823 rotates with the gear 81, thereby tightening the clockwork belt 822 to store energy.

[0060] The transmission mechanism 83 is disposed at the output end of the spring shaft 823 .

[0061] like Fig. 9 As shown, the transmission mechanism 83 includes a rotating assembly 831 , a first rotating shaft 832 , a transmission belt 833 and a second rotating shaft 834 .

[0062] like Figure 8 As shown, the rotating assembly 831 includes a first rotating disk 8311, a sliding groove 8312, a spring 8313, a wedge block 8314 and a second rotating disk 8315; the first rotating disk 8311 is fixed on the clockwork shaft 823, the sliding groove 8312 is arranged on the end surface of the first rotating disk 8311 facing the second rotating disk 8315, the spring 8313 is arranged in the sliding groove, one end of the spring 8313 is fixed on the clockwork shaft 823, and the wedge block 8314 is fixed on the other end of the spring 8313; a wedge-shaped groove matching the wedge block 8314 is provided on the end surface of the second rotating disk 8315 facing the first rotating disk 8311, and the wedge block 8314 is clamped in the wedge-shaped groove.

[0063] When moving from one end of the first groove 73 to the other end of the first groove 73, the gear 81 drives the spring shaft 823 to rotate in the process of the first rack 712 and the second rack 722 meshing and moving forward, and the spring shaft 823 drives the spring belt 822 to tighten. In this process, energy is stored in the spring belt. Under the action of the elastic deformation of the spring 8313, the wedge block 8314 slides on the inner wall of the wedge groove, and the wedge block 8314 does not engage with the wedge groove. The wedge block 8314 cannot drive the second rotating disk 8315 to rotate, that is, the first rotating disk 8311 rotates, and the second rotating disk 8315 does not move. At this time, the transmission mechanism 83 does not work.

[0064] When the gear 81 moves to the other end of the first groove 73, the first rack 712 and the second rack 722 are not set at this position, and the gear 81 is free from the constraints of the first rack 712 and the second rack 722. There is no external force and constraint on the gear 81, and the gear 81 also loses the constraint on the spring mechanism 82. The energy stored in the spring belt 822 is released by driving the spring shaft 823 to rotate; one end of the spring shaft 823 drives the gear 81 to rotate, and the gear 81 drives the first rod 87 to rotate in the bearing, completing the energy release. The amount of release, the other end of the clockwork shaft 823 drives the first rotating disk 8311 to rotate, in this rotation direction, the wedge block 8314 is stuck in the wedge-shaped groove, the wedge block 8314 drives the second rotating disk to rotate through the wedge-shaped groove, the transmission mechanism 83 starts to work, the first rotating disk 8311 drives the second rotating disk to rotate, the second rotating disk drives the first rotating shaft 832 to rotate, the first rotating shaft 832 drives the second rotating shaft 834 to rotate through the transmission belt 833, and the force is transmitted to the second rotating shaft 834.

[0065] The slide bar assembly 84 is disposed at the output end of the second rotating shaft 834; the slide bar assembly 84 includes a second rod 841 and a sleeve 843. Fig.10 and Fig.11 As shown, the sleeve 843 is sleeved on the second rod 841; the second rod 841 is parallel to the powder spreading device 4 and is arranged opposite to the trapezoidal scraper 421; the length of the second rod 841 matches the powder spreading device 4; a second groove 842 begins to be provided on the side wall surface of the second rod 841, and the second groove 842 includes a first S-shaped sub-groove and a second S-shaped sub-groove, the first S-shaped sub-groove is distributed in an S shape from one end of the second rod 841 adjacent to the second rotating shaft 834 to the other end away from the second rotating shaft 834, the second S-shaped sub-groove starts from the other end of the first S-shaped sub-groove, and is distributed in an S shape from the other end of the second rod 841 to one end of the second rod 841, and the second groove 842 is a continuous S reciprocating groove from one end to the other end of the second rod 841;

[0066] The sleeve 843 is sleeved on the second rod 841, and a through slot 844 is provided at a position of the sleeve 843 opposite to the trapezoidal scraper 421. The through slot 844 is provided along the axial direction of the sleeve 843, and the length of the through slot 844 matches the second groove 842. The slidable end of the slider passes through the through slot 844 and reciprocates on the second groove 842.

[0067] When the second rotating shaft 834 rotates, the second rod 841 is driven to rotate, and the slider 85 reciprocates on the second groove 842 and in the through groove 844 of the sleeve 843 .

[0068] In the embodiment, Fig.12 and Fig.14 As shown, the wiping member 86 includes a first cleaning sub-member 861, the first cleaning sub-member 861 has a wiping groove 8611, the wiping groove 8611 matches the trapezoidal scraper 421, the first cleaning sub-member 861 is arranged on the trapezoidal scraper 421, the side wall of the wiping groove 8611 is connected to the slider 85, and during the reciprocating motion of the slider 85 in the second groove 842, the first cleaning sub-member 861 moves on the scraper, wipes the scraper, and scrapes off excess metal powder on the scraper; wherein, the length of the second groove 842 satisfies the movement of the wiping member 86 from one end of the trapezoidal scraper 421 to the other end, and then moves from the other end of the trapezoidal scraper 421 to one end of the trapezoidal scraper 421, that is, the wiping groove 8611 reciprocates on the trapezoidal scraper 421.

[0069] The first cleaning sub-component 861 is made of elastic and wear-resistant material and can produce elastic deformation.

[0070] like Fig.14 As shown, the wiping member 86 also includes a second cleaning sub-member 862, and the second cleaning sub-member 862 is arranged on the outer wall of the first cleaning sub-member 861, and the second cleaning sub-member 862 is relatively arranged at the lower end of the powder holding groove 411, and the cleaning end of the second cleaning sub-member 862 can be a cleaning cloth, and a cleaning brush body can also be set; during the movement of the wiping member 86, the second cleaning sub-member 862 cleans the lower end surface of the powder holding groove 411, especially cleans the output port of the powder holding groove 411, so as to avoid excess metal powder remaining at the output port of the powder holding groove 411.

[0071] During the use of the equipment, especially when different metal powders are used for different laser melting, if different metal powders remain on the scraper, it is particularly easy for different metal powders to remain at the bottom of the powder holding tank 411 or at the output port of the powder holding tank 411. When the equipment works again, the residual metal powder will be mixed into the metal powder this time, which will affect the laser melting forming effect.

[0072] In this embodiment, after the clockwork mechanism 82 completes energy accumulation, in the process of releasing energy, the transmission mechanism 83 drives the slide bar assembly 84 to rotate, and the slider 85 slides in the groove of the second rod 841. The slider 85 reciprocates on the side wall of the scraper, driving the wiping member 86 to wipe the scraper. The first cleaning sub-component 861 scrapes off the metal powder remaining on the trapezoidal scraper, and the second cleaning sub-component 862 cleans the bottom of the powder holding groove 411 or the output port of the powder holding groove 411. During the use of the equipment, there is no need to replace the scraper, and laser melting products of different metal powders can be produced.

[0073] In the above embodiment, Fig.12 and Fig.13 As shown, it also includes a mixing component 9, which includes a gantry 91 and a mixing piece 92 on the gantry 91, one end of the gantry 91 is arranged on the slider 85, and the other end of the gantry 91 is arranged on the mixing piece 92; the mixing piece 92 is located in the powder-laying containing groove 411, and the mixing piece 92 is arranged near the bottom of the powder-laying containing groove 411. During the reciprocating motion of the slider 85 along the scraper, the gantry 91 drives the mixing piece 92 to reciprocate in the powder-laying containing groove 411, so as to flatten the metal powder in the powder-laying containing groove 411 and avoid the problem of inconsistent height of the metal powder in the powder-laying containing groove 411.

[0074] If the metal powder is unevenly distributed in the powder holding tank 411, with some high and some low, especially when the amount of metal powder in the powder holding tank 411 is small, when the metal powder is laid to the end, the metal powder output at the low place is small, and the metal powder output at the high place is large, the scraper will only scrape the metal with large output, and on the paving plane, the place with small output will form a depression or a slope, so that the final laying of the metal powder cannot form a flat plane, and the product processing cannot be completed during laser melting.

[0075] In this embodiment, the mixing element 92 ensures that the metal powder is evenly spread in the powder holding groove 411 during the reciprocating motion in the powder holding groove 411, thereby ensuring that the metal powder spread on the powder plane 3 is flat and has a consistent height, thereby ensuring the final laser processing effect.

[0076] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A laser selective melting forming device, characterized in that: The invention comprises a printing chamber (1), a powder spreading guide rail (2), a powder spreading plane (3) and a powder spreading device (4); the powder spreading guide rail (2) is arranged on two side walls of the printing chamber (1); the powder spreading plane (3) is located on the lower end surface of the printing chamber (1); and the two ends of the powder spreading device (4) are movably arranged on the powder spreading guide rail (2); The powder spreading device (4) is provided with a scraper device (42), and the scraper device (42) is arranged parallel to the powder spreading plane (3).

2. The laser selective melting forming equipment according to claim 1, characterized in that: The powder spreading device (4) comprises a main body (41).

3. The laser selective melting forming equipment according to claim 2, characterized in that: The main body (41) is provided with a powder receiving groove (411) and a scraper installation groove (412).

4. The laser selective melting forming equipment according to claim 2, characterized in that: The powder spreading device (4) further comprises powder spreading vehicle hanging ears (5) arranged at both ends of the main body (41).

5. The laser selective melting forming equipment according to claim 3, characterized in that: The scraper device (42) is arranged in the scraper installation groove (412).

6. The laser selective melting forming equipment according to claim 3, characterized in that: The scraper device (42) comprises a trapezoidal scraper (421), a scraper frame (422), a scraper pressure plate (423), a scraper hanging ear (424), a scraper frame support plate (425), a photoelectric sensor (426) and a leveling component (427); The trapezoidal scraper (421) is arranged on the lower end surface of the scraper holder (422); the scraper holder (422) is arranged on the lower end surface of the scraper pressing plate (423); the scraper hanging ears (424) are arranged on the left and right ends of the scraper pressing plate (423); and the scraper holder support plate (425) is arranged on the upper end surface of the scraper hanging ears (424).

7. The laser selective melting forming equipment according to claim 6, characterized in that: The number of the leveling components (427) is 2.

8. The laser selective melting forming equipment according to claim 6, characterized in that: The leveling assembly (427) includes a leveling screw (4271) and a compression spring (4272).

9. The laser selective melting forming equipment according to claim 8, characterized in that: A first accommodating groove (4121) is provided at a position of the scraper installation groove (412) corresponding to the compression spring (4272).

10. The selective laser melting forming equipment according to claim 9, characterized in that: A second receiving groove (4122) is provided at a position of the scraper installation groove (412) corresponding to the leveling screw (4271).

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