Selective laser melting 3D printing equipment and laser scanning device thereof

Abstract

The utility model relates to selective laser melting 3D printing equipment and a laser scanning device thereof. The laser scanning device comprises at least two groups of laser emitting units, the laser emitting unit comprises a laser emitting device and a reflecting mechanism, the reflecting mechanism reflects laser rays of the laser emitting device so that the laser can melt the metal powder laid on the workbench, and the reflecting mechanism is rotationally arranged and adjusts the direction of the reflected laser rays. The reflecting mechanism adjusts the direction of the reflected laser light, so that the laser is reflected to different areas to melt the metal powder, and therefore the incident angle of the laser to the workbench can be adjusted according to the surface shape of a product needing to be printed, the smoothness of the surface of the product can be improved, and the light intensity of all irradiation areas is consistent during inclined irradiation; and the two laser emitting units emit laser at the same time, the product is heated at multiple points, the heat balance degree of the product is improved, and the stress is more uniform.

Description

Technical Field

[0001] The utility model relates to the field of 3D printing, and more specifically, to a laser selective melting 3D printing device and a laser scanning device thereof. Background Art

[0002] Selective laser melting (SLM) is a method of metal additive manufacturing. During the processing, the laser emits a laser, which is processed by the optical system and then irradiated onto the processing plane. Under the control of the control system, the laser scans the powder bed of metal powder according to the contour curve calculated by the system's STL file. The above steps are repeated to complete the melting and forming of multiple slices.

[0003] Existing laser scanning devices use a displacement mechanism in conjunction with a direct laser emitting device to perform scanning and melting operations, but the scanning speed is slow and the movement efficiency of the planar moving mechanism is not high; the scanning speed can be accelerated when a reflection mechanism is used to change the scanning position, but when the reflection mechanism changes the irradiation position, an inclined light path will be formed, and the light energy density is inconsistent. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a laser selective melting 3D printing device and a laser scanning device thereof in view of the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the utility model to solve the technical problem is: constructing a laser scanning device of a laser selective melting 3D printing device, including at least two groups of laser emitting units;

[0006] The laser emitting unit includes a laser emitting device and a reflecting mechanism. The reflecting mechanism reflects the laser light of the laser emitting device so that the laser melts the metal powder laid on the workbench. The reflecting mechanism is rotatably arranged to adjust the direction of the reflected laser light.

[0007] In some embodiments, the laser scanning device includes two groups of laser emitting units symmetrically arranged relative to the workbench.

[0008] In some embodiments, the emission directions of the two symmetrically arranged groups of laser emission units are arranged opposite to each other.

[0009] In some embodiments, the reflecting mechanism comprises a rotatably arranged reflecting mirror.

[0010] In some embodiments, the reflection mechanism further includes a mounting seat for mounting the reflector to drive the reflector to rotate.

[0011] In some embodiments, the laser scanning device further includes an adjustment mechanism for adjusting the position of the laser emitting unit relative to the workbench.

[0012] In some embodiments, the adjustment mechanism includes a guide rod and a guide seat slidably mounted on the guide rod, and the laser emitting unit is mounted on the guide seat.

[0013] In some embodiments, the adjustment mechanism further includes a screw rod arranged parallel to the guide rod, and a motor driving the screw rod to rotate, and the guide seat cooperates with the screw rod so that the screw rod drives the guide seat to move along the guide rod.

[0014] In some embodiments, the reflection mechanism is connected to the guide base so as to move synchronously with the guide base.

[0015] A laser selective melting 3D printing device comprises the laser scanning device.

[0016] The implementation of the laser selective melting 3D printing equipment and its laser scanning device of the utility model has the following beneficial effects: the reflection mechanism of the laser scanning device adjusts the direction of the reflected laser light, so that the position of the laser emitting device does not need to be changed, and the laser can be reflected to different areas to melt the metal powder. At the same time, the position of the laser emitting device and the reflection direction of the reflection mechanism can be adjusted according to the position of the melting area to be melted, so that the incident angle of the laser to the workbench can be adjusted according to the surface shape of the product to be printed, which can improve the smoothness of the product surface, make the light intensity of each irradiation area consistent during oblique irradiation, adjust the melting effect, and improve the 3D printing manufacturing quality.

[0017] In addition, by allowing two groups of laser emitting units to emit lasers at the same time, multiple points on the product can be heated, improving the heat balance on the product and making the stress of the product more uniform. At the same time, the energy distribution in different areas can also be adjusted as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0019] Figure 1 It is a schematic diagram of the top view of the structure of the laser scanning device of the laser selective melting 3D printing device in the embodiment of the utility model;

[0020] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the laser scanning device. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0022] like Figure 1 ,2 As shown, a laser selective melting 3D printing device in a preferred embodiment of the utility model includes an operating table 1 and a laser scanning device 2. The operating table 1 is provided with an operating port 11, and a liftable workbench is provided in the operating port 11. After metal powder is laid on the workbench, the laser scanning device 2 can emit laser to the metal powder on the workbench to melt the metal powder into shape.

[0023] The laser scanning device 2 includes two groups of laser emitting units 21. Of course, it may also include more than two groups of laser emitting units 21 to simultaneously emit lasers to the metal powder on the workbench.

[0024] The laser emitting unit 21 includes a laser emitting device 211 and a reflecting mechanism 212. The laser light emitted by the laser emitting device 211 does not directly reach the workbench, but is emitted to the reflecting mechanism 212. The reflecting mechanism 212 reflects the laser light of the laser emitting device 211. The reflected laser reaches the powder laid on the workbench, so that the laser melts the laid metal powder.

[0025] Furthermore, the reflection mechanism 212 adjusts the direction of the reflected laser light so that the position of the laser emitting device 211 does not need to be changed, and the laser can be reflected to different areas to melt the metal powder. At the same time, the position of the laser emitting device 211 and the reflection direction of the reflection mechanism 212 can be adjusted according to the position of the melting area to be melted. Therefore, the incident angle of the laser to the workbench can be adjusted according to the surface shape of the product to be printed, which can improve the smoothness of the product surface, make the light intensity of each irradiation area consistent during oblique irradiation, adjust the melting effect, and improve the 3D printing manufacturing quality.

[0026] In addition, the two groups of laser emitting units 21 emit lasers at the same time, so that multiple points on the product are heated, the heat balance on the product is improved, and the stress of the product is more uniform. At the same time, the energy distribution in different areas can be adjusted as needed.

[0027] By setting up multiple groups of laser emitting units 21 to realize scanning and printing operations on a flat area, the product can be divided into multiple areas for printing. The reflection mechanism 212 of each laser emitting unit 21 only needs to scan within the divided area, which reduces the calculation amount of a single laser emitting unit 21 and improves the scanning and printing speed.

[0028] Preferably, the laser scanning device 2 includes two groups of laser emitting units 21 symmetrically arranged relative to the workbench. The symmetrically designed dual laser emitting units 21 enable different laser emitting units 21 to obliquely irradiate different irradiation areas with consistent light intensity, so that the surface effects printed in different areas also remain consistent.

[0029] In this embodiment, the emission directions of the two symmetrically arranged groups of laser emitting units 21 are arranged relative to each other, so as to facilitate the control of the printing area of ​​each laser emitting unit 21 and reduce mutual influence.

[0030] In some embodiments, the reflection mechanism 212 includes a rotatable reflector 2121 and a mounting base 2122 for mounting the reflector 2121 to drive the reflector 2121 to rotate. By driving the reflector 2121 to rotate, the laser emitted by the laser emitting unit 21 can be reflected to different areas.

[0031] Furthermore, the laser scanning device 2 also includes an adjustment mechanism 22 for adjusting the position of the laser emitting unit 21 relative to the operating table 1, so that the laser emitting unit 21 can be translated relative to the operating table 1, and cooperate with the reflection of the reflection mechanism 212 to allow the laser to reach a larger area and be more flexible, making it convenient to adjust the direction of the laser.

[0032] The adjustment mechanism 22 includes a guide rod 221, a guide seat 222 slidably mounted on the guide rod 221, a screw rod 223 arranged parallel to the guide rod 221, and a motor 224 driving the screw rod 223 to rotate. The laser emitting unit 21 is installed on the guide seat 222. Driven by the motor 224, the screw rod 223 rotates and drives the guide seat 222 to move along the guide rod 221. The position of the laser emitting unit 21 is adjusted, and the screw rod 223 drives the guide seat 222 to move along the guide rod 221.

[0033] In addition, the reflection mechanism 212 is connected to the guide seat 222, so that the reflection mechanism 212 moves synchronously with the guide seat 222. In other embodiments, the motor 224 can also drive the guide seat 222 to move along the guide rail, driving the laser emitting unit 21 to adjust its position.

[0034] Preferably, each laser emitting unit 21 is provided with a corresponding set of adjustment mechanisms 22, so that each laser emitting unit 21 can independently adjust its position relative to the workbench, so as to facilitate printing according to the appearance of the product.

[0035] It can be understood that the above-mentioned technical features can be used in any combination without limitation.

[0036] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A laser scanning device for laser selective melting 3D printing equipment, characterized in that: It comprises at least two groups of laser emitting units (21); The laser emitting unit (21) comprises a laser emitting device (211) and a reflection mechanism (212); the reflection mechanism (212) reflects the laser light of the laser emitting device (211) so that the laser melts the metal powder laid on the workbench; the reflection mechanism (212) is rotatably arranged to adjust the direction of the reflected laser light.

2. The laser scanning device according to claim 1, characterized in that: The laser scanning device (2) comprises two groups of laser emitting units (21) which are symmetrically arranged relative to the workbench.

3. The laser scanning device according to claim 2, characterized in that: The emission directions of the two groups of symmetrically arranged laser emission units (21) are arranged opposite to each other.

4. The laser scanning device according to claim 1, characterized in that: The reflection mechanism (212) comprises a rotatably arranged reflection mirror (2121).

5. The laser scanning device according to claim 4, characterized in that: The reflection mechanism (212) further comprises a mounting seat (2122) for mounting the reflection mirror (2121) to drive the reflection mirror (2121) to rotate.

6. The laser scanning device according to any one of claims 1 to 5, characterized in that: The laser scanning device (2) further comprises an adjustment mechanism (22) for adjusting the position of the laser emitting unit (21) relative to the workbench.

7. The laser scanning device according to claim 6, characterized in that: The adjustment mechanism (22) comprises a guide rod (221) and a guide seat (222) slidably mounted on the guide rod (221), and the laser emitting unit (21) is mounted on the guide seat (222).

8. The laser scanning device according to claim 7, characterized in that: The adjusting mechanism (22) further comprises a screw rod (223) arranged parallel to the guide rod (221), and a motor (224) driving the screw rod (223) to rotate; the guide seat (222) cooperates with the screw rod (223) so that the screw rod (223) drives the guide seat (222) to move along the guide rod (221).

9. The laser scanning device according to claim 7, characterized in that: The reflection mechanism (212) is connected to the guide seat (222) so as to move synchronously with the guide seat (222).

10. A laser selective melting 3D printing device, characterized in that: A laser scanning device comprising any one of claims 1 to 9.

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