Laser beam collaborative scanning system

Abstract

The present invention discloses a laser beam collaborative scanning system, in which at least two groups of laser scanning galvanometer systems are arranged above a forming chamber, and the forming area of ​​the forming chamber is divided into at least two independent scanning partitions. The laser beam emitted by each group of laser scanning galvanometer systems corresponds to a scanning partition, and each group of laser scanning galvanometer systems independently scans each scanning partition at the same time. The present invention abandons the traditional concept of improving laser forming efficiency, and divides the forming area of ​​the forming chamber into multiple independent scanning partitions. Multiple groups of laser scanning galvanometer systems simultaneously emit multiple groups of laser beams to synchronously scan each scanning partition respectively. The scanning speed is very fast, and efficient processing of the workpiece is realized. Moreover, the processing efficiency can be doubled without the use of a high-efficiency galvanometer system. The stacked and staggered installation of multiple groups of laser scanning galvanometer systems is realized above the forming chamber by longitudinal dislocation, and the increase in the forming chamber area can also be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D laser printing, and in particular to a laser beam collaborative scanning system. Background Art

[0002] Among various laser scanning technologies, SLM is currently the most widely used laser scanning technology. In the current SLM technology, a single galvanometer is used to scan and process the powder in the forming area. For large workpieces, its processing efficiency is low. Therefore, in order to improve processing efficiency, the current method is to use a high-efficiency galvanometer system to improve processing efficiency by improving laser scanning efficiency. However, this efficiency adjustment capability is limited, and the high-efficiency galvanometer system is expensive, making it difficult to widely use. Summary of the Invention

[0003] In order to make up for the above shortcomings, the present invention provides a laser beam collaborative scanning system, which divides the forming area of ​​the forming chamber into multiple scanning partitions, and uses multiple groups of laser scanning galvanometer systems to synchronously scan the multiple scanning partitions independently, thereby greatly improving the workpiece processing efficiency.

[0004] In order to solve its technical problems, the technical solution adopted by the present invention is: it includes a forming chamber, a laser scanning galvanometer system and a control system, at least two groups of laser scanning galvanometer systems are arranged above the forming chamber, and the forming area of ​​the forming chamber forms at least two independent scanning partitions. The laser beam emitted by each group of laser scanning galvanometer systems corresponds to a scanning partition, and the control system controls each group of laser scanning galvanometer systems to independently scan each scanning partition at the same time.

[0005] As a further improvement of the invention, the scanning range of the laser beam of the laser scanning galvanometer system is larger than the corresponding scanning partition range.

[0006] As a further improvement of the invention, the forming area of ​​the forming chamber is divided into 15 independent scanning partitions, and 15 groups of laser scanning galvanometer systems are arranged above the forming chamber.

[0007] As a further improvement of the invention, the top plate of the forming chamber is a step structure of different heights, and 15 groups of laser scanning galvanometer systems are distributed on different step structures. The laser scanning galvanometer systems on the step structures of different heights are arranged in a staggered state in the height direction and in an interlaced and stacked state in the horizontal direction. The focal lengths of the laser scanning galvanometer systems on different step structures are different, and the focus of each laser scanning galvanometer system is located on the same forming plane.

[0008] As a further improvement of the invention, the top plate of the forming chamber forms a "convex" shaped structure with a middle height higher than the heights on both sides, wherein 5 groups of laser scanning galvanometer systems are evenly distributed on the step structure with a high middle height, and 5 groups of laser scanning galvanometer systems are distributed on each of the step structures with low heights on both sides, and the laser scanning galvanometer systems on the steps with low heights on both sides are arranged symmetrically, and the 5 groups of laser scanning galvanometer systems on the step structure with a high middle height and the laser scanning galvanometer systems on the steps with low heights on either side are distributed in an overlapping and staggered state.

[0009] As a further improvement of the invention, the nominal scanning area of ​​each group of laser scanning galvanometer systems is 550×550mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems distributed on the low-height step structures on both sides is 300×200mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems distributed on the middle high step structure is 400×200mm 2 .

[0010] As a further improvement of the invention, each group of laser scanning galvanometer systems scans in the forming chamber along the wind speed direction of the adverse wind field.

[0011] As a further improvement of the invention, each group of laser scanning galvanometer systems adopts a two-dimensional digitally driven galvanometer.

[0012] The beneficial technical effect of the present invention is: the present invention abandons the traditional concept of improving laser forming efficiency, divides the forming area of ​​the forming chamber into multiple independent scanning partitions, and simultaneously emits multiple groups of laser beams through multiple groups of laser scanning galvanometer systems to synchronously scan each scanning partition. Since the scanning area corresponding to each pair of laser scanning galvanometer systems is very small, the scanning speed is very fast, thereby realizing efficient processing of the workpiece, and the processing efficiency can be doubled without the use of a high-efficiency galvanometer system. By longitudinally dislocating the multiple groups of laser scanning galvanometer systems above the forming chamber, the stacked and staggered installation of multiple groups of laser scanning galvanometer systems can be realized, and the increase in the forming chamber area can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A three-dimensional diagram of the installation structure of the laser scanning galvanometer system of the present invention;

[0014] Figure 2 This is a front view of the installation structure of the laser scanning galvanometer system of the present invention;

[0015] Figure 3 A top view of the installation structure of the laser scanning galvanometer system of the present invention;

[0016] Figure 4 A scanning state diagram according to scanning partitions of the present invention;

[0017] Figure 5 This is a laser scanning accuracy analysis diagram of the present invention. DETAILED DESCRIPTION

[0018] Embodiment: A laser beam collaborative scanning system includes a forming chamber 1, a laser scanning galvanometer system 2 and a control system. At least two groups of laser scanning galvanometer systems 2 are arranged above the forming chamber 1. The forming area of ​​the forming chamber 1 forms at least two independent scanning partitions 3. The laser beam 4 emitted by each group of laser scanning galvanometer systems corresponds to a scanning partition 3. The control system controls each group of laser scanning galvanometer systems 2 to independently scan each scanning partition 3 at the same time.

[0019] During laser cladding forming processing, each group of laser scanning galvanometer systems 2 scans and processes the corresponding scanning partition 3 according to the design requirements. Since the scanning area responsible for each group of laser scanning galvanometer systems 2 is small, it can achieve high-speed processing and greatly improve the processing efficiency. In addition, the area corresponding to the laser beam 4 of each group of laser scanning galvanometer systems 2 is small, which ensures that the laser scanning spot is always the optimal spot and the product scanning accuracy is high.

[0020] The scanning range of the laser beam 4 of the laser scanning galvanometer system 2 is larger than the range of the corresponding scanning partition 3. This ensures that every point in the partition can be scanned to avoid blind spots.

[0021] The forming area of ​​the forming chamber 1 is divided into 15 independent scanning zones 3, and 15 groups of laser scanning galvanometer systems 2 are disposed above the forming chamber 1. The 15 groups of laser scanning galvanometer systems 2 simultaneously scan the 15 scanning zones 3, resulting in high scanning efficiency. Of course, other numbers of laser scanning galvanometer systems 2, such as 10 or 20 groups, may also be used. This is a choice freely made by those skilled in the art based on this patent and actual circumstances, and all such choices fall within the scope of protection of this application.

[0022] The top plate of the forming chamber 1 is a step structure 5 of different heights, and 15 groups of laser scanning galvanometer systems 2 are distributed on different step structures 5. The laser scanning galvanometer systems on the step structures 5 of different heights are arranged in a staggered state in the height direction and arranged in a staggered and stacked state in the horizontal direction. The focal lengths of the laser scanning galvanometer systems on the different step structures 5 are different, and the focus of each laser scanning galvanometer system is located on the same forming plane. When the 15 groups of laser scanning galvanometer systems 2 are arranged above the forming chamber 1, they are arranged in a layered and staggered manner, and the staggering is achieved through the longitudinal height difference, which effectively reduces the area occupied by the laser scanning galvanometer system 2 in the horizontal direction, and realizes the effective arrangement of the 15 groups of laser scanning galvanometer systems 2 within a limited area, so that the laser beams 4 of the 15 groups of laser scanning galvanometer systems 2 are evenly and effectively projected onto each scanning partition 3 for laser scanning processing, avoiding increasing the area of ​​the forming chamber 1.

[0023] The top plate of the forming chamber 1 forms a "convex"-shaped structure with a middle height higher than the heights on both sides. Five groups of laser scanning galvanometer mirror systems 2 are evenly spaced on the high-center step structure 5, and five groups of laser scanning galvanometer mirror systems 2 are each distributed on the low-level step structures 5 on both sides. The laser scanning galvanometer mirror systems 2 on the low-level steps on both sides are arranged symmetrically, and the five groups of laser scanning galvanometer mirror systems 2 on the high-center step structure 5 are stacked and staggered with the laser scanning galvanometer mirror systems 2 on either side of the low-level steps. The "convex"-shaped forming top surface design allows the 15 groups of laser scanning galvanometer mirror systems 2 to be evenly and symmetrically arranged above the forming chamber 1, enabling simultaneous and efficient processing of the 15 scanning zones 3.

[0024] The nominal scanning area of ​​each group of laser scanning galvanometer system 2 is 550×550mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems 2 distributed on the low-height step structures 5 on both sides is 300×200mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems 2 distributed on the middle high step structure 5 is 400×200mm 2 .

[0025] The nominal scanning area of ​​each group of laser scanning galvanometer system 2 is 550×550mm 2 , and the scanning area of ​​each galvanometer in the 10 groups of laser scanning galvanometer systems 2 on both sides is 300×200mm 2 The scanning area of ​​each galvanometer in the central 5 groups of laser scanning galvanometer system 2 is 400×200mm 2 Each group of laser scanning galvanometer systems 2 can scan within its corresponding scanning area 3. When a laser scanning galvanometer system 2 is damaged, the adjacent laser scanning galvanometer system 2 can replace it to perform cross-area scanning. That is, the maximum scanning area of ​​each group of laser scanning galvanometer systems 2 is 400×400mm 2 The diameter of the light spot changes by only 2μm during the scanning process, and the scanning accuracy is high.

[0026] Each group of laser scanning galvanometer systems 2 scans in the forming chamber 1 along the wind speed direction against the wind field, which can fully ensure the scanning accuracy.

[0027] Each group of laser scanning galvanometer systems 2 adopts a two-dimensional digitally driven galvanometer.

Claims

1. A laser beam cooperative scanning system, characterized in that: The invention comprises a forming chamber (1), a laser scanning galvanometer system (2) and a control system, wherein at least two groups of laser scanning galvanometer systems are arranged above the forming chamber, and the forming area of ​​the forming chamber forms at least two independent scanning partitions (3), and the laser beam (4) emitted by each group of laser scanning galvanometer systems corresponds to one scanning partition. The control system controls each group of laser scanning galvanometer systems to independently scan each scanning partition at the same time, and the forming area of ​​the forming chamber is divided into 15 independent scanning partitions. 15 groups of laser scanning galvanometer systems are arranged above the forming chamber, and the top plate of the forming chamber is a step structure (5) of different heights. The 15 groups of laser scanning galvanometer systems are respectively distributed on different step structures. The laser scanning galvanometer systems on the step structures of different heights are arranged in a staggered state in the height direction and arranged in a staggered and stacked state in the horizontal direction. The focal lengths of the laser scanning galvanometer systems on different step structures are different, and the focus of each laser scanning galvanometer system is located on the same forming plane. The scanning range of the laser beam of the laser scanning galvanometer system is greater than the range of its corresponding scanning partition, and each group of laser scanning galvanometer systems scans in the forming chamber along the wind speed direction of the headwind field.

2. The laser beam cooperative scanning system according to claim 1, wherein: The top plate of the forming chamber forms a "convex" shaped structure with a middle height higher than the heights on both sides, wherein five groups of laser scanning galvanometer systems are evenly distributed on the step structure with a high middle height, and five groups of laser scanning galvanometer systems are distributed on each of the step structures with low heights on both sides, and the laser scanning galvanometer systems on the steps with low heights on both sides are arranged symmetrically, and the five groups of laser scanning galvanometer systems on the step structure with a high middle height and the laser scanning galvanometer systems on the steps with low heights on either side are distributed in an overlapping and staggered state.

3. The laser beam cooperative scanning system according to claim 2, wherein: The nominal scanning area of ​​each set of laser scanning galvanometer systems is 550×550mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems distributed on the low-height step structures on both sides is 300×200mm 2 The actual scanning area of ​​each group of laser scanning galvanometer systems distributed on the middle high step structure is 400×200mm 2 .

4. The laser beam cooperative scanning system according to claim 1, wherein: Each group of laser scanning galvanometer systems uses a two-dimensional digitally driven galvanometer.

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