Infrared light green light composite additive manufacturing equipment and printing method thereof

Abstract

The present invention discloses an infrared-green-light composite additive manufacturing equipment, comprising: a printing and forming platform; a galvanometer placement platform, which is arranged above the printing and forming platform and has a laser cavity therein, wherein the top surface of the galvanometer placement platform is provided with a first step surface and a second step surface; an infrared galvanometer, which is arranged on the first step surface and is used to emit an infrared laser into the laser cavity; a green galvanometer, which is arranged on the second step surface and is used to emit a green laser into the laser cavity; an infrared laser, which is connected to the infrared galvanometer, so that the infrared galvanometer emits an infrared laser; and a green laser, which is connected to the green galvanometer, so that the green galvanometer emits a green laser. The present invention also discloses a printing method for infrared-green-light composite additive manufacturing equipment. Through the above method, the present invention can emit infrared laser and green laser for 3D printing, and can realize the integrated printing of high-reflective materials and conventional materials.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printers, and in particular to infrared light and green light composite additive manufacturing equipment and a printing method thereof. Background Art

[0002] Metal additive manufacturing, as an emerging part preparation process, can achieve high-efficiency, high-precision, and complex metal part manufacturing. Usually, the energy source used in metal additive manufacturing is infrared laser, which has a relatively fixed wavelength. However, for some metal materials, such as copper and its alloys, the reflectivity of infrared laser is very high, and during the forming process, the laser is often reflected to damage optical components. Insufficient laser absorption rate will also lead to insufficient energy absorption by the material, resulting in poor part forming quality.

[0003] The existing light sources for additive manufacturing of high-reflective metal materials are mostly short-wavelength green light. Short-wavelength green light lasers can increase the absorption rate of lasers by high-reflective metal materials and meet the forming requirements of additive manufacturing of high-reflective material samples. However, the current green light additive manufacturing equipment for high-reflective materials is mainly used to form a single high-reflective material, and still has limitations when forming integrated multi-material parts of high-reflective materials and conventional materials. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the present invention provides an infrared light and green light composite additive manufacturing equipment and a printing method thereof to solve the above-mentioned technical problems.

[0006] (II) Technical solution

[0007] To solve the above technical problems, the present invention provides the following technical solution: an infrared light green light composite additive manufacturing equipment, characterized in that it includes: a printing and molding platform; a galvanometer placement platform, which is arranged above the printing and molding platform and has a laser cavity therein, wherein the top surface of the galvanometer placement platform is provided with a first step surface and a second step surface; an infrared galvanometer, which is arranged on the first step surface and is used to emit an infrared laser into the laser cavity; a green galvanometer, which is arranged on the second step surface and is used to emit a green laser into the laser cavity; an infrared laser, which is connected to the infrared galvanometer through a first optical fiber so that the infrared galvanometer emits an infrared laser; a green laser, which is connected to the green galvanometer through a second optical fiber so that the green galvanometer emits a green laser; wherein the horizontal planes where the first step surface and the second step surface are located are different, so that the infrared laser emitted by the infrared galvanometer and the green laser emitted by the green galvanometer reach a focus on the printing and molding platform.

[0008] Furthermore, it also includes: a first galvanometer adjustment seat, which is arranged on the first step surface, wherein the infrared light galvanometer is arranged on the first galvanometer adjustment seat, so that the horizontality of the infrared light galvanometer can be adjusted through the first galvanometer adjustment seat; a second galvanometer adjustment seat, which is arranged on the second step surface, wherein the green light galvanometer is arranged on the second galvanometer adjustment seat, so that the horizontality of the green light galvanometer can be adjusted through the second galvanometer adjustment seat.

[0009] Furthermore, the first optical fiber is connected to the infrared light galvanometer through a collimator, and the second optical fiber is connected to the green light galvanometer through a beam expander, wherein the first galvanometer adjustment seat is provided with a first height adjustment module for automatically adjusting the height of the infrared light galvanometer, and the second galvanometer adjustment seat is provided with a second height adjustment module for automatically adjusting the height of the green light galvanometer.

[0010] Furthermore, it also includes: a powder storage cylinder for outputting various types of powders, wherein the powder storage cylinder includes a first powder storage cylinder for outputting infrared laser printing powder and a second powder storage cylinder for outputting green laser printing powder; a molding cylinder, which is arranged in the printing molding platform; a lifting platform, which can be lifted and lowered in the molding cylinder; a powder dropping mechanism, which is arranged in the printing molding platform, wherein the powder dropping mechanism includes a receiving groove arranged in the printing molding platform and used to receive powder, and the molding cylinder is arranged at the center of the receiving groove; a powder screening mechanism, which is arranged below one end of the bottom of the receiving groove, for receiving the powder output from the powder dropping mechanism, wherein the powder screening mechanism is provided A powder screen for filtering the powder; a powder return mechanism, the bottom end of which is connected to the powder screening mechanism, for conveying the powder output from the powder screening mechanism; a powder transition cylinder, arranged above the printing forming platform, wherein the powder transition cylinder is connected to the powder return mechanism, so as to convey the powder output from the powder screening mechanism to the powder transition cylinder through the powder return mechanism; wherein the powder transition cylinder is connected to the first powder storage cylinder and the second powder storage cylinder through a control gate, and the horizontal plane where the powder transition cylinder is located is higher than the horizontal plane where the powder storage cylinder is located, so that the powder in the powder transition cylinder automatically flows back to the first powder storage cylinder or the second powder storage cylinder through the control gate.

[0011] Furthermore, one end of the bottom of the receiving groove is provided with a powder dropping outlet, and the powder dropping mechanism also includes a powder conveying channel connected to the powder dropping outlet and a powder dropping shaft rotatably arranged in the powder conveying channel, wherein the top of the powder screening mechanism is connected to the bottom end of the powder conveying channel; the horizontal width of the inner hole of the powder conveying channel is equal to the horizontal width of the powder dropping shaft, and the outer wall of the powder dropping shaft is spaced apart with a plurality of powder collecting grooves, and the bottom of the receiving groove is arranged in an inclined surface, and the horizontal plane where one end of the bottom of the receiving groove is located is lower than the horizontal plane where the other end of the bottom of the receiving groove is located, wherein the powder dropping mechanism also includes a triangular-shaped powder dropping auxiliary block, and the powder dropping auxiliary block is arranged at the receiving groove. between the side wall of the other end of the containing groove and the forming cylinder; the powder screening mechanism includes a powder screening bin and a vibrator, the top of the powder screening bin is connected to the bottom end of the powder conveying channel, and the bottom end of the powder screening bin is connected to the bottom end of the powder return mechanism, wherein the powder screen is arranged in the middle of the powder screening bin, and the vibrator is arranged on the powder screen to drive the powder screen to vibrate; the bottom surface of the inner cavity of the powder screening bin is arranged in an inclined shape, and the horizontal plane where one end of the bottom surface of the inner cavity of the powder screening bin is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder screening bin is located, wherein one end of the bottom surface of the inner cavity of the powder screening bin is provided with a powder outlet of the powder screening bin connected to the bottom end of the powder return mechanism.

[0012] In order to solve the above technical problems, the present invention provides another technical solution as follows: a printing method for infrared light and green light composite additive manufacturing equipment, characterized in that the infrared light and green light composite additive manufacturing equipment described in any one of the above items is used for work, and the printing method includes: obtaining a three-dimensional model of the product to be printed through modeling software, and dividing the material model; before printing starts, checking whether the product to be printed contains multiple materials; if it is determined that the product to be printed contains multiple materials, setting the supply sequence of the multiple materials and setting the follow-up forming mode of the product to be printed; after printing starts, for the single layer of powder in the forming cylinder, controlling the infrared light laser and / or green light laser to scan according to the follow-up forming mode of the product; after the product is printed, controlling the lifting platform to rise, clearing the excess powder in the forming cylinder to drop it into the receiving groove, and taking out the product for wire cutting; performing grinding, sandblasting and polishing post-processing processes to obtain the final infrared green light composite formed metal product.

[0013] Furthermore, the follow-up forming mode includes: using green light laser as product forming scanning laser and using infrared light laser as auxiliary processing laser.

[0014] Furthermore, the follow-up forming mode includes: controlling the infrared laser to preheat the powder before the green laser scans, and controlling the infrared laser to remelt the product after the green laser scans.

[0015] Furthermore, the printing method also includes: when excess powder in the forming cylinder falls into the receiving groove, controlling the powder dropping shaft to rotate, wherein the more powder falls into the receiving groove, the faster the rotation speed of the powder dropping shaft is controlled.

[0016] Furthermore, the forming cylinder includes an infrared light area, a green light area and a red-green light composite area. The printing method of the infrared-green light composite additive manufacturing equipment also includes: when the powder in the powder feeding channel falls into the powder screening bin, controlling the vibrator to work to drive the powder screen to vibrate.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an infrared-green-light composite additive manufacturing equipment and a printing method thereof, which have the following beneficial effects: the infrared-green-light composite additive manufacturing equipment disclosed in the present invention includes: a printing and forming platform; a galvanometer placement platform, which is arranged above the printing and forming platform and has a laser cavity therein, wherein the top surface of the galvanometer placement platform is provided with a first step surface and a second step surface; an infrared galvanometer, which is arranged on the first step surface and is used to emit an infrared laser into the laser cavity; a green galvanometer, which is arranged on the second step surface and is used to emit a green laser into the laser cavity; an infrared laser, which is connected to the infrared galvanometer, so that the infrared galvanometer emits an infrared laser; a green laser, which is connected to the green galvanometer, so that the green galvanometer emits a green laser. In the above manner, the present invention can emit infrared laser and green laser for 3D printing by arranging the infrared laser and the green laser in the same manufacturing equipment, and can realize the integrated printing of high-reflective materials and conventional materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the infrared light and green light composite additive manufacturing equipment of the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of the first partial structure of the mid-infrared green light composite additive manufacturing equipment

[0021] Figure 3 for Figure 1 Schematic diagram of the cross-section structure of the mid-infrared and green light composite additive manufacturing equipment;

[0022] Figure 4 It is a structural schematic diagram of another embodiment of the infrared light and green light composite additive manufacturing equipment of the present invention;

[0023] Figure 5 for Figure 4 A schematic diagram of a first partial structure of another embodiment of a mid-infrared light and green light composite additive manufacturing equipment;

[0024] Figure 6 for Figure 4 A schematic diagram of a partial cross-section structure of another embodiment of a mid-infrared light and green light composite additive manufacturing equipment;

[0025] Figure 7 for Figure 4 A second partial structural schematic diagram of another embodiment of a mid-infrared light and green light composite additive manufacturing equipment;

[0026] Figure 8 for Figure 4 A schematic diagram of the structure of the powder dropping shaft of the middle powder dropping mechanism;

[0027] Fig. 9 for Figure 4 Schematic diagram of the structure of the middle powder transition cylinder;

[0028] Fig.10 for Figure 4 A schematic diagram of the first partial cross-section structure of the powder return mechanism;

[0029] Fig.11 for Figure 4 A second partial cross-sectional structural schematic diagram of the middle powder return mechanism;

[0030] Fig.12 It is a schematic flow chart of the printing method of the infrared light and green light composite additive manufacturing equipment of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] like Figure 1-3 As shown, the present invention discloses an infrared light and green light composite additive manufacturing equipment, including a printing and molding platform 11, a galvanometer placement table 21, an infrared light galvanometer 22, a green light galvanometer 23, an infrared light laser 24 and a green light laser 25.

[0033] It should be understood that the product to be printed is printed on the printing platform 11 .

[0034] The galvanometer placement platform 21 is disposed above the printing and molding platform 11 , wherein a laser cavity 210 is disposed in the galvanometer placement platform 21 .

[0035] Preferably, the top surface of the galvanometer placement platform 21 is provided with a first step surface and a second step surface.

[0036] The infrared galvanometer 22 is disposed on the first step surface, and is used for emitting infrared laser light into the laser cavity 210 .

[0037] The green galvanometer 23 is disposed on the second step surface, and is used for emitting green laser light into the laser cavity 210 .

[0038] The infrared laser 24 is connected to the infrared galvanometer 22 via a first optical fiber to emit infrared laser light to the infrared galvanometer 22 .

[0039] The green laser 25 is connected to the green galvanometer 23 via a second optical fiber to emit green laser light for the green galvanometer 23 .

[0040] In this embodiment, the first step surface and the second step surface are located at different horizontal planes, so that the infrared laser light emitted by the infrared galvanometer 22 and the green laser light emitted by the green galvanometer 23 reach the focus on the printing platform 11. In other words, the infrared laser light emitted from the infrared galvanometer 22 reaches the focus required for printing on the printing platform 11, and the green laser light emitted from the green galvanometer 23 reaches the focus required for printing on the printing platform 11.

[0041] That is to say, the present invention adopts a stepped galvanometer to place the cavity, which can make infrared lasers and green lasers of different wavelengths reach focus in the same plane. At the same time, the placement spacing and projection format can meet the three-area division of a single infrared light area (only infrared laser scanning), a single green light area (only green laser scanning) and an infrared light and green light composite area (infrared light laser and green light laser composite scanning), thereby realizing three types of forming area divisions. It can realize single infrared light laser part forming, single green light laser part forming, infrared light and green light laser same-width composite part forming and infrared light and green light laser same-part multi-material integrated forming in one printing, and has a high forming degree of freedom.

[0042] Furthermore, the infrared light and green light composite additive manufacturing equipment also includes a first galvanometer adjustment seat 211 and a second galvanometer adjustment seat 212, wherein the first galvanometer adjustment seat 211 is arranged on the first step surface, and the infrared light galvanometer 22 is arranged on the first galvanometer adjustment seat 211, so that the horizontality of the infrared light galvanometer 22 can be adjusted through the first galvanometer adjustment seat 211.

[0043] The second galvanometer adjustment seat 212 is disposed on the second step surface, and the green light galvanometer 23 is disposed on the second galvanometer adjustment seat 212 , so that the horizontality of the green light galvanometer 23 can be adjusted through the second galvanometer adjustment seat 212 .

[0044] In this embodiment, the first optical fiber is connected to the infrared light galvanometer 22 through a collimator 221, and the second optical fiber is connected to the green light galvanometer 23 through a beam expander 231, wherein the first galvanometer adjustment seat 211 is provided with a first height adjustment module for automatically adjusting the height of the infrared light galvanometer 22, and the second galvanometer adjustment seat 212 is provided with a second height adjustment module for automatically adjusting the height of the green light galvanometer 23, and the heights adjusted by the first height adjustment module and the second height adjustment module are the same and synchronized.

[0045] It is worth noting that the first height adjustment module and the second height adjustment module of this embodiment are independently height-adjustable, and the infrared light galvanometer 22 is detachably arranged on the first galvanometer adjustment seat 211 and the green light galvanometer 23 is detachably arranged on the second galvanometer adjustment seat 212, so that different models of infrared light galvanometer 22 or green light galvanometer 23 can be replaced as needed. In addition, in some special embodiments, the first height adjustment module and the second height adjustment module are automatically height-adjustable, and the first galvanometer adjustment seat 211 is provided with a first identifier for identifying the model of the infrared light galvanometer 22, and the second galvanometer adjustment seat 212 is provided with a second identifier for identifying the model of the green light galvanometer 23. Furthermore, the first height adjustment module is also used to automatically adjust the height of the infrared light galvanometer 22 on the first step surface after the first identifier identifies the model of the infrared light galvanometer 22, so that the infrared light laser emitted by the infrared light galvanometer 22 reaches the focus on the printing and molding platform 11; and the second height adjustment module is also used to automatically adjust the height of the green light galvanometer 23 on the second step surface after the second identifier identifies the model of the green light galvanometer 23, so that the green light laser emitted by the green light galvanometer 23 reaches the focus on the printing and molding platform 11, so that after replacing different models of infrared light galvanometers 22 or green light galvanometers 23, the height of the infrared light galvanometer 22 or the green light galvanometer 23 is automatically adjusted to achieve the focus required for printing.

[0046] Further references Figure 4-11 The infrared light and green light composite additive manufacturing equipment also includes a powder storage cylinder 10, a forming cylinder 12, a lifting platform 13, a powder dropping mechanism 14, a powder screening mechanism 15, a powder returning mechanism 16 and a powder transition cylinder 17.

[0047] The powder storage cylinder 10 is used to output various types of powders, wherein the powder storage cylinder 10 includes a first powder storage cylinder for outputting infrared laser printing powder and a second powder storage cylinder for outputting green laser printing powder. That is to say, the infrared laser output by the infrared galvanometer 22 is used to print the infrared laser printing powder output by the first powder storage cylinder, and the green laser output by the green galvanometer 23 is used to print the green laser printing powder output by the second powder storage cylinder. As for how the first powder storage cylinder conveys the infrared laser printing powder to the printing and forming platform 11 and how the second powder storage cylinder conveys the green laser printing powder to the printing and forming platform 11, it is not considered in this embodiment, and can be specifically implemented by using the powder spreading structure in the prior art, which will not be described in detail here.

[0048] The forming cylinder 12 is arranged in the printing and forming platform 11 .

[0049] The lifting platform 13 can be lifted and lowered in the forming cylinder 12. It should be understood that after the single-layer scanning is completed, the lifting platform 13 will be lowered, and after a new layer of powder is supplied, the next layer of parts scanning will be carried out.

[0050] The powder dropping mechanism 14 is disposed in the printing and molding platform 11 , wherein the powder dropping mechanism 14 includes a receiving groove 141 disposed in the printing and molding platform 11 and used for receiving powder, and the molding cylinder 12 is disposed at the center of the receiving groove 141 .

[0051] Preferably, the forming cylinder 12 is in a rectangular three-dimensional shape, and the receiving groove 141 is in a rectangular three-dimensional shape, wherein the length and width of the horizontal cross-section of the forming cylinder 12 are both smaller than the length and width of the horizontal cross-section of the receiving groove 141, or the length and width of the horizontal cross-section of the top end of the forming cylinder 12 are both smaller than the length and width of the horizontal cross-section of the top end of the receiving groove 141, so that the powder in the forming cylinder 12 (including infrared laser printing powder or green laser printing powder) will fall into the receiving groove 141.

[0052] It should be understood that when performing printing additive manufacturing, the first powder storage cylinder and the second powder storage cylinder are used to supply powder independently. For example, when the first powder storage cylinder spreads powder into the forming cylinder 12 for printing, after printing is completed, the excess powder will be swept into the receiving groove 141, and then the second powder storage cylinder will spread powder into the forming cylinder 12 for printing. After printing is completed, the excess powder will be swept into the receiving groove 141, and then the first powder storage cylinder will spread powder into the forming cylinder 12 for printing, and the operation is repeated in sequence.

[0053] In this embodiment, the bottom of the receiving groove 141 is arranged in an inclined surface, so the powder dropped into the receiving groove 141 will move in one direction. Specifically, the horizontal plane where one end of the bottom of the receiving groove 141 is located is lower than the horizontal plane where the other end of the bottom of the receiving groove 141 is located, so that the powder dropped into the receiving groove 141 will flow toward one end of the bottom of the receiving groove 141.

[0054] Furthermore, the powder dropping mechanism 14 further includes a powder dropping auxiliary block 140 in a triangular shape, wherein the powder dropping auxiliary block 140 is disposed between the side wall of the other end of the receiving groove 141 and the molding cylinder 12. It should be understood that since the powder dropping auxiliary block 140 is in a triangular shape, when the powder falls into the receiving groove 141, some of the powder passes through the powder dropping auxiliary block 140 and quickly falls into the other end of the receiving groove 141, and the powder at the other end of the receiving groove 141 also quickly flows to one end of the receiving groove 141.

[0055] The powder screening mechanism 15 is disposed below one end of the bottom of the receiving groove 141 for receiving the powder outputted from the powder dropping mechanism 14 , wherein a powder screen 151 for filtering the powder is disposed in the powder screening mechanism 15 .

[0056] The bottom end of the powder return mechanism 16 is connected to the powder screening mechanism 15 for conveying the powder output from the powder screening mechanism 15 .

[0057] The powder transition cylinder 17 is disposed above the printing and molding platform 11 , wherein the powder transition cylinder 17 is connected to the powder return mechanism 16 so as to transport the powder output from the powder screening mechanism 15 to the powder transition cylinder 17 through the powder return mechanism 16 .

[0058] In this embodiment, the powder transition cylinder 17 is connected to the first powder storage cylinder and the second powder storage cylinder through a control gate, wherein the horizontal plane where the powder transition cylinder 17 is located is higher than the horizontal plane where the powder storage cylinder 10 (i.e., the first powder storage cylinder and the second powder storage cylinder) is located, so that the powder in the powder transition cylinder 17 automatically flows back to the first powder storage cylinder or the second powder storage cylinder through the control gate. In other words, it is possible to select whether to connect the powder transition cylinder 17 to the first powder storage cylinder or to select whether to connect the powder transition cylinder 17 to the second powder storage cylinder through a control valve (such as automatic control). When the powder transition cylinder 17 is controlled to be connected to the first powder storage cylinder by the control valve, the powder in the powder transition cylinder 17 automatically flows back to the first powder storage cylinder, and when the powder transition cylinder 17 is controlled to be connected to the second powder storage cylinder by the control valve, the powder in the powder transition cylinder 17 automatically flows back to the second powder storage cylinder.

[0059] It should be understood that since the horizontal plane of the powder transition cylinder 17 is higher than the horizontal plane of the powder storage cylinder 10, the powder in the powder transition cylinder 17 will automatically flow back to the powder storage cylinder 10 due to gravity, without the need for additional power drive, thus saving costs.

[0060] In this embodiment, a powder outlet 1411 is provided at one end of the bottom of the receiving groove 141, wherein the powder dropping mechanism 14 also includes a powder delivery channel 142 connected to the powder delivery outlet 1411 and a powder dropping shaft 143 rotatably arranged in the powder delivery channel 142, and the top end of the powder screening mechanism 15 is connected to the bottom end of the powder delivery channel 142, so that the powder in the receiving groove 141 is input into the powder delivery channel 142 through the powder outlet 1411, and is input into the powder screening mechanism 15 through the powder delivery channel 142.

[0061] Preferably, the horizontal width of the inner hole of the powder delivery channel 142 is equal to the horizontal width of the powder dropping shaft 143, wherein the outer wall of the powder dropping shaft 143 is provided with a plurality of powder collecting grooves 1431 at intervals. It should be understood that the horizontal length of the inner hole of the powder delivery channel 142 is equal to the horizontal length of the powder dropping shaft 143, so when the powder dropping shaft 143 does not rotate, the powder dropping shaft 143 blocks the powder delivery channel 142, so that the powder in the powder delivery channel 142 cannot flow into the powder screening mechanism 15, and the plurality of powder collecting grooves 1431 are provided along the length direction of the powder dropping shaft 143, and the powder collecting grooves 1431 are used to collect powder, and when the powder dropping shaft 143 rotates, the powder collecting shaft 1431 of the powder dropping shaft 143 rotates with the powder, and finally the powder of the powder collecting shaft 1431 falls into the powder screening mechanism 15, so that the powder dropping amount can be controlled by controlling the rotation speed of the powder dropping shaft 143 as needed.

[0062] Furthermore, the infrared light and green light composite additive manufacturing equipment also includes a first driving motor connected to the powder dropping shaft 143, and the powder dropping shaft 143 can be driven to rotate by the first driving motor.

[0063] In this embodiment, the powder screening mechanism 15 includes a powder screening bin 150 and a vibrator, wherein the top of the powder screening bin 150 is connected to the bottom of the powder conveying channel 142, and the bottom of the powder screening bin 140 is connected to the bottom of the powder return mechanism 16, so that the powder input from the powder conveying channel 142 to the powder screening bin 150 is filtered by the powder screen 151 and then flows into the powder return mechanism 16.

[0064] Preferably, the powder screen 151 is disposed in the middle of the powder screening bin 150, and a vibrator is disposed on the powder screen 151 to drive the powder screen 151 to vibrate. It is worth noting that in some embodiments, the powder screening mechanism 15 may not include the powder screen 151 and the vibrator, so that the powder input from the powder feeding channel 142 directly enters the powder screening bin 150, and is transported from the powder screening bin 150 to the powder return mechanism 16.

[0065] Furthermore, the bottom surface of the inner cavity of the powder sieve bin 150 is arranged in an inclined shape, wherein the horizontal plane where one end of the bottom surface of the inner cavity of the powder sieve bin 150 is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder sieve bin 150 is located, so that the powder in the powder sieve bin 150 will flow from the other end of the bottom surface of the inner cavity of the powder sieve bin 150 to one end of the bottom surface of the inner cavity of the powder sieve bin 150.

[0066] Preferably, a powder outlet 1501 of the powder sieving bin connected to the bottom end of the powder returning mechanism 16 is provided at one end of the bottom surface of the inner cavity of the powder sieving bin 150 .

[0067] In this embodiment, the powder return mechanism 16 includes an inclined return mechanism shell 161 and a conveyor belt 162, wherein a receiving cavity 160 is provided in the return mechanism shell 161 along its length direction, a first synchronous shaft 1601 is rotatably provided at one end of the receiving cavity 160, and a second synchronous shaft 1602 is rotatably provided at the other end of the receiving cavity 160, and the conveyor belt 162 is arranged around the first synchronous shaft 1601 and the second synchronous shaft 1602, so that when the first synchronous shaft 1601 or the second synchronous shaft 1602 rotates, the conveyor belt 162 is driven to rotate.

[0068] It is worth noting that the infrared light green light composite additive manufacturing equipment also includes a second drive motor connected to the first synchronous shaft 1601 or the second synchronous shaft 1602, so that the second drive motor drives the first synchronous shaft 1601 or the second synchronous shaft 1602 to rotate, thereby driving the conveyor belt 162 to rotate (such as Figure 7 counterclockwise as shown in the figure).

[0069] Furthermore, the conveyor belt 162 is provided with a plurality of support plates 1621 at intervals along its length direction, wherein the support plates 1621 and the conveyor belt 162 form a clamping groove for accommodating powder, and a powder return inlet 1611 connected to the powder outlet 1501 of the powder screening bin is provided at the bottom end of one side of the return mechanism shell 161, and a powder return outlet 1612 connected to the powder transition cylinder 17 is provided at the top end of the other side of the return mechanism shell 161, so that the powder input from the powder outlet 1501 of the powder screening bin 150 enters the containing cavity 160 from the powder return inlet 1611 and falls into the clamping groove formed by the support plates 1621 and the conveyor belt 162. As the conveyor belt 162 moves, the powder carried by the clamping groove finally falls into the powder return outlet 1612 and is transported from the powder return outlet 1612 to the powder transition cylinder 17.

[0070] Preferably, the lengths of the plurality of support plates 1621 are the same, and the width of the support plates 1621 is the same as the width of the conveyor belt 162 .

[0071] In order to allow the powder to fall accurately into the groove formed by the support plate 1621 and the conveyor belt 162, in this embodiment, when the conveyor belt 162 carries the powder upward (i.e. rotates counterclockwise), the support plate 1621 at the bottom (i.e. Fig.10 The support plate 1621-1 in the middle, the support plate at the bottom on the same side as the powder sieving bin powder outlet 1501) forms a first angle a with the straight line D parallel to the conveyor belt 162 and the horizontal and vertical straight line C at the outermost end, and the end bottom plate position of the powder sieving bin powder outlet 1501 is within the first angle a. It should be understood that when the end bottom plate position of the powder sieving bin powder outlet 1501 is within the first angle a, the powder input from the powder sieving bin powder outlet 1501 can just fall into the groove formed by the support plate 1621 and the conveyor belt 162, and when the end bottom plate position of the powder sieving bin powder outlet 1501 is not within the first angle a, the powder input from the powder sieving bin powder outlet 1501 does not fall or very little falls into the groove formed by the support plate 1621 and the conveyor belt 162.

[0072] In order to allow the powder in the clamping groove of the conveyor belt 162 to fall accurately into the powder return outlet 1612, in this embodiment, when the conveyor belt 162 is unloading powder downward (i.e., rotating counterclockwise), the support plate 1621 (i.e., the highest point) is Fig.11 The support plate 1621-2 in the middle is the support plate at the highest point on the same side as the powder return outlet 1612, and the support plate above the support plate 1621-2 is not yet completely on the same side as the powder return outlet 1612) and the outermost end of the straight line B parallel to the conveyor belt 162 and the horizontal and vertical straight line A form a second angle b, and the inner end bottom plate of the powder return outlet 1612 is within the second angle b. It should be understood that the inner end bottom plate of the powder return outlet 1612 is within the second angle b, and the powder dropped from the clip groove in the conveyor belt 162 can just fall into the powder return outlet 1612. The inner end bottom plate of the powder return outlet 1612 is not within the second angle b, and very little or no powder dropped from the clip groove in the conveyor belt 162 falls into the powder return outlet 1612, and most of it will fall into the receiving cavity 160.

[0073] Furthermore, the infrared light green light composite additive manufacturing equipment also includes a dust residual material cylinder 18, wherein the dust residual material cylinder 18 is connected to the bottom end of the return mechanism housing 161, and is used to recover the powder in the receiving cavity 160. It should be understood that the horizontal plane where the connection port of the dust residual material cylinder 18 and the return mechanism housing 161 is located is lower than the powder return entrance 1611, and there will be some dust in the transportation process of the powder in the receiving cavity 160, and the dust will enter the dust residual material cylinder 18 from the bottom end of the return mechanism housing 161 after settling.

[0074] In this embodiment, a receiving cavity is provided in the powder transition cylinder 17, and a powder delivery port which is connected to the receiving cavity and to the powder return outlet 1612 is provided at the top of the powder transition cylinder 17, wherein a partition block 173 which is triangular and divides the receiving cavity into a first receiving cavity 171 and a second receiving cavity 172 which are symmetrically arranged is provided in the receiving cavity, and a first inclined channel 174 which is connected to the first receiving cavity 171 and a second inclined channel 175 which is connected to the second receiving cavity 172 is extended from the bottom of the powder transition cylinder 17, and the first inclined channel 174 and the first powder storage cylinder The second inclined channel 175 is connected to the second powder storage cylinder, so that the powder (i.e., infrared laser printing powder) input from the powder return outlet 1612 enters the first receiving cavity 171 through the powder feeding port, and finally the powder naturally flows into the first powder storage cylinder through the first inclined channel 174 according to gravity, so that the powder (i.e., green laser printing powder) input from the powder return outlet 1612 enters the second receiving cavity 172 through the powder feeding port, and finally the powder naturally flows into the second powder storage cylinder through the second inclined channel 175 according to gravity, thereby achieving the effect of powder recovery and reuse.

[0075] Furthermore, the control valve is arranged in the powder delivery port of the powder transition cylinder 17, that is, the powder return outlet 1612 and the first receiving cavity 171 can be connected and disconnected by the control valve, and the powder return outlet 1612 and the second receiving cavity 172 can be connected and disconnected by the control valve.

[0076] Preferably, the first receiving cavity 171 and the second receiving cavity 172 are symmetrically arranged, and the first inclined channel 174 and the second inclined channel 175 are both inclinedly arranged, so that the powder can flow back into the first powder storage cylinder and the second powder storage cylinder better, thus preventing the existence of blind spots for storing powder.

[0077] It is worth noting that the recovery of the infrared laser printing powder and the green laser printing powder in this embodiment is completed independently, that is, the infrared laser printing powder is recovered into the first powder storage cylinder, and the green laser printing powder is recovered into the second powder storage cylinder, and the two do not interfere with each other, that is, after the infrared laser printing powder is spread and printed, the infrared laser printing powder will be recycled, and after the infrared laser printing powder is recovered into the first powder storage cylinder, the green laser printing powder will be controlled to spread and print, and after the green laser printing powder is recycled and the green laser printing powder is recovered into the second powder storage cylinder, the infrared laser printing powder will continue to be controlled to spread and print. Of course, during the printing process, for the same layer of powder, if the same layer of powder contains infrared laser printing powder and green laser printing powder, the green laser printing powder can be spread first, and then the green laser can be controlled to scan and print the green laser printing powder of this layer. After the scanning and printing is completed, the excess green laser printing powder is cleaned (such as by blowing or scraping) into the receiving groove 141. At this time, the powder dropping shaft 143 and the vibrator are controlled to work so that the excess powder falls into the powder return mechanism 16, and the conveyor belt 162 of the powder return mechanism 16 is controlled to rotate to transport the powder to the second receiving cavity 11 of the powder transition cylinder 17. 72, to flow back into the second powder storage cylinder; then spread the infrared laser printing powder on the same layer, and then control the infrared laser to scan and print the infrared laser printing powder of this layer, and after the scanning and printing is completed, the excess infrared laser printing powder is cleaned (such as by blowing or scraping) into the receiving groove 141, and at this time, the powder dropping shaft 143 and the vibrator are controlled to work, so that the excess powder falls into the powder return mechanism 16, and the conveyor belt 162 of the powder return mechanism 16 is controlled to rotate to transport the powder to the first receiving cavity 171 of the powder transition cylinder 17, so as to flow back into the first powder storage cylinder, and then another layer of powder is spread. The time for each powder recovery is controlled to be executed in a relatively short time. Of course, another powder can also be spread after all the powder in the receiving groove 141 falls into the powder screening bin 150.

[0078] That is to say, the present invention can automatically and separately recycle powder (i.e., infrared laser printing powder or green laser printing powder) and re-convey it to the powder storage cylinder without the need for printing operation processing. It can effectively improve the efficiency of additive work and reduce the harm caused by manual contact with powder for a long time. It also effectively solves the problems of cumbersome powder extraction, screening, and powder application, large time consumption, low production efficiency, and high labor costs in powder additive, and also improves the degree of automation of the equipment so as to enable high-efficiency and low-cost production.

[0079] Further, such as Fig.12 As shown, the present invention discloses a printing method of infrared light green light composite additive manufacturing equipment, which adopts the above-mentioned infrared light green light composite additive manufacturing equipment to work. Specifically, the printing method of the infrared light green light composite additive manufacturing equipment includes the following steps:

[0080] Step S101: Obtain a three-dimensional model of a product to be printed through modeling software, and divide the material model.

[0081] It should be understood that in step S101, the three-dimensional model is sliced ​​with a fixed layer thickness through slicing software such as Magic, and imported into the forming and printing equipment. The regional position is placed according to the forming requirements of the product parts (that is, single infrared laser forming, single green laser forming, or infrared and green laser composite forming), and the process parameters of the infrared laser and green laser at different parts are set respectively.

[0082] Step S102: Before printing begins, check whether the product to be printed contains multiple materials. It should be understood that the detection of whether the product to be printed contains multiple materials can be directly known through the parameters of the product, that is, manually input, and the printing device can directly identify and obtain it.

[0083] Step S103: If it is determined that the product to be printed contains multiple materials, the supply sequence of the multiple materials is set and the follow-up forming mode of the product to be printed is set.

[0084] Step S104: After printing starts, the infrared laser and / or green laser is controlled to scan the single layer of powder in the forming cylinder according to the follow-up forming mode of the product.

[0085] In this embodiment, the follow-up forming mode includes: using green laser as the product forming scanning laser and using infrared laser as the auxiliary processing laser.

[0086] Furthermore, in other embodiments, the follow-up forming mode includes: controlling the infrared laser to preheat the powder before the green laser scans, and controlling the infrared laser to remelt the product after the green laser scans.

[0087] That is to say, the present invention adopts an infrared laser and green laser composite forming mode, with the green laser as the forming laser and the infrared laser as the pre-processing (preheating) or post-processing (remelting) laser. Infrared and green laser composite forming printing can be achieved in the overlapping area. At the same time, in the overlapping area, different materials can be formed in the same layer using different powders according to the different areas of the parts, thereby realizing the integrated multi-material part forming of high-reflective materials and conventional materials.

[0088] Step S105: After the product is printed, the lifting platform is controlled to rise, excess powder in the molding cylinder is cleared to fall into the receiving groove, and the product is taken out for wire cutting.

[0089] Step S106: performing post-processing processes of grinding, sandblasting and polishing to obtain the final infrared green light composite formed metal product.

[0090] Furthermore, the printing method of the infrared-green-light composite additive manufacturing equipment further includes: when the excess powder (i.e., infrared laser printing powder or green laser printing powder) in the forming cylinder 12 falls into the receiving groove 141, the powder dropping shaft 143 is controlled to rotate. In other words, as long as powder falls into the receiving groove 141, the powder dropping shaft 143 will rotate, so that no powder remains in the receiving groove 141.

[0091] Preferably, the more powder falls into the receiving groove 141 , the faster the rotation speed of the powder dropping shaft 143 is controlled.

[0092] In this embodiment, the forming cylinder 12 includes an infrared light area, a green light area and a red-green light composite area. It should be understood that the infrared laser scans alone in the infrared light area, the green laser scans alone in the green light area, and the infrared laser and the green laser can scan in the red-green light composite area.

[0093] Furthermore, the printing method of the infrared light green light composite additive manufacturing equipment further includes: when the powder in the powder feeding channel 142 falls into the powder screening bin 150, controlling the vibrator to work to drive the powder screen 151 to vibrate. In other words, as long as powder falls into the powder screening bin 150, the vibrator will be started.

[0094] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0095] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An infrared light and green light composite additive manufacturing equipment, characterized in that: include: Printing platform; A galvanometer placement platform is arranged above the printing and forming platform, and a laser cavity is arranged inside the galvanometer placement platform, wherein a first step surface and a second step surface are arranged on the top surface of the galvanometer placement platform; An infrared galvanometer, disposed on the first step surface, and used for emitting infrared laser light into the laser cavity; A green light galvanometer, disposed on the second step surface, and used for emitting green laser light into the laser cavity; an infrared laser, connected to the infrared galvanometer via a first optical fiber, so as to emit infrared laser light to the infrared galvanometer; A green laser is connected to the green galvanometer through a second optical fiber to emit green laser light from the green galvanometer; The first step surface and the second step surface are located on different horizontal planes, so that the infrared laser light emitted by the infrared galvanometer and the green laser light emitted by the green galvanometer reach a focus on the printing platform; The infrared and green light composite additive manufacturing equipment also includes: A first galvanometer adjustment seat is arranged on the first step surface, wherein the infrared light galvanometer is arranged on the first galvanometer adjustment seat, so that the horizontality of the infrared light galvanometer can be adjusted through the first galvanometer adjustment seat; A second galvanometer adjustment seat is arranged on the second step surface, wherein the green light galvanometer is arranged on the second galvanometer adjustment seat, so that the horizontality of the green light galvanometer can be adjusted through the second galvanometer adjustment seat; The first optical fiber is connected to the infrared light galvanometer through a collimator, and the second optical fiber is connected to the green light galvanometer through a beam expander, wherein the first galvanometer adjustment seat is provided with a first height adjustment module for automatically adjusting the height of the infrared light galvanometer, and the second galvanometer adjustment seat is provided with a second height adjustment module for automatically adjusting the height of the green light galvanometer; The infrared and green light composite additive manufacturing equipment also includes: A powder storage cylinder for outputting various types of powders, wherein the powder storage cylinder comprises a first powder storage cylinder for outputting infrared laser printing powder and a second powder storage cylinder for outputting green laser printing powder; A forming cylinder, arranged in the printing and forming platform; A lifting platform, which can be lifted and lowered in the forming cylinder; A powder dropping mechanism is arranged in the printing and forming platform, wherein the powder dropping mechanism comprises a receiving groove arranged in the printing and forming platform and used to receive powder, and the forming cylinder is arranged at the center of the receiving groove; A powder screening mechanism is arranged below one end of the bottom of the receiving groove, and is used to receive the powder output from the powder dropping mechanism, wherein a powder screen is provided in the powder screening mechanism for filtering the powder; A powder return mechanism, the bottom end of which is connected to the powder screening mechanism, and is used to transport the powder output from the powder screening mechanism; A powder transition cylinder is arranged above the printing and forming platform, wherein the powder transition cylinder is connected to the powder return mechanism so as to transport the powder output from the powder screening mechanism to the powder transition cylinder through the powder return mechanism; Among them, the powder transition cylinder is connected to the first powder storage cylinder and the second powder storage cylinder through a control gate, and the horizontal plane where the powder transition cylinder is located is higher than the horizontal plane where the powder storage cylinder is located, so that the powder in the powder transition cylinder automatically flows back to the first powder storage cylinder or the second powder storage cylinder through the control gate.

2. The infrared light and green light composite additive manufacturing equipment according to claim 1, characterized in that: A powder outlet is provided at one end of the bottom of the receiving groove, and the powder dropping mechanism also includes a powder conveying channel connected to the powder outlet and a powder dropping shaft rotatably arranged in the powder conveying channel, wherein the top of the powder screening mechanism is connected to the bottom end of the powder conveying channel; the horizontal width of the inner hole of the powder conveying channel is equal to the horizontal width of the powder dropping shaft, and a plurality of powder collecting grooves are arranged at intervals on the outer wall of the powder dropping shaft, and the bottom of the receiving groove is arranged in an inclined surface, and the horizontal plane where one end of the bottom of the receiving groove is located is lower than the horizontal plane where the other end of the bottom of the receiving groove is located, wherein the powder dropping mechanism also includes a triangular powder dropping auxiliary block, and the powder dropping auxiliary block is arranged in the receiving groove. between the side wall of the other end of the groove and the forming cylinder; the powder screening mechanism includes a powder screening bin and a vibrator, the top of the powder screening bin is connected to the bottom end of the powder conveying channel, and the bottom end of the powder screening bin is connected to the bottom end of the powder return mechanism, wherein the powder screen is arranged in the middle of the powder screening bin, and the vibrator is arranged on the powder screen to drive the powder screen to vibrate; the bottom surface of the inner cavity of the powder screening bin is arranged in an inclined shape, and the horizontal plane where one end of the bottom surface of the inner cavity of the powder screening bin is located is lower than the horizontal plane where the other end of the bottom surface of the inner cavity of the powder screening bin is located, wherein one end of the bottom surface of the inner cavity of the powder screening bin is provided with a powder outlet of the powder screening bin connected to the bottom end of the powder return mechanism.

3. A printing method for infrared light and green light composite additive manufacturing equipment, characterized in that: The infrared light green light composite additive manufacturing equipment according to claim 2 is used for operation, and the printing method comprises: Obtain the 3D model of the product to be printed through modeling software and divide the material model; Before printing, check whether the product to be printed contains multiple materials; If it is determined that the product to be printed contains multiple materials, set the supply order of the multiple materials and set the follow-up forming mode of the product to be printed; After printing starts, the infrared laser and / or green laser is controlled to scan the single layer of powder in the forming cylinder according to the follow-up forming mode of the product; After the product is printed, the lifting platform is controlled to rise, excess powder in the molding cylinder is removed to drop into the receiving groove, and the product is taken out for wire cutting; Grinding, sandblasting and polishing are performed as post-processing processes to obtain the final infrared green light composite formed metal product.

4. The printing method of infrared light and green light composite additive manufacturing equipment according to claim 3, characterized in that: The follow-up forming mode includes: using green light laser as product forming scanning laser and using infrared light laser as auxiliary processing laser.

5. The printing method of infrared light and green light composite additive manufacturing equipment according to claim 3, characterized in that: The follow-up forming mode includes: controlling the infrared laser to preheat the powder before the green laser scans, and controlling the infrared laser to remelt the product after the green laser scans.

6. The printing method of infrared light and green light composite additive manufacturing equipment according to claim 3, characterized in that: The printing method further includes: when excess powder in the molding cylinder falls into the receiving groove, controlling the powder dropping shaft to rotate, wherein the more powder falls into the receiving groove, the faster the rotation speed of the powder dropping shaft is controlled.

7. The printing method of infrared light and green light composite additive manufacturing equipment according to claim 6, characterized in that: The forming cylinder includes an infrared light area, a green light area and a red-green light composite area. The printing method of the infrared-green light composite additive manufacturing equipment also includes: when the powder in the powder feeding channel falls into the powder screening bin, controlling the vibrator to work to drive the powder screen to vibrate.

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