Laser collimator for additive manufacturing

Abstract

The utility model relates to the field of laser collimators, in particular to a laser collimator for additive manufacturing. The technical problems that in the using process of a laser collimator, due to the fact that the thermal stress of a printed part is increased, more splashing can be generated, a key hole is formed, bubbles can be generated in a molten pool through the key hole, air hole defects are formed, and the quality of the printed part is reduced are solved. According to the technical scheme, the laser collimator for additive manufacturing comprises a collimator body and further comprises a QBH interface, a divergence angle fine adjustment module, a connecting sleeve, a water-cooled mirror cavity, a laser collimating mirror assembly and an output threaded interface. According to the utility model, the divergence angle fine tuning module is used for fine tuning the distance between the laser optical fiber plug and the laser collimating mirror assembly, the water-cooled mirror cavity can ensure the coaxiality and thermal stability of the whole optical path, and then the space ring can effectively reduce the direct contact and friction between the lenses, thereby reducing the potential damage and wear.

Description

Technical Field

[0001] The utility model relates to the field of laser collimators, in particular to a laser collimator for additive manufacturing. Background Art

[0002] Laser additive manufacturing technology has become the most important hot forming technology in the high-tech process industry in the 21st century. It can perform high-efficiency and low-consumption metallurgical forming on mechanical components with complex configurations. Laser, as an energy source in the additive manufacturing process, is the key to activating and heating materials. The development of laser technology has an important impact on the accuracy, speed and material adaptability of additive manufacturing. The collimator, as an important component in the laser processing system, directly affects the shape, stability and focusing performance of the laser beam. The design of the collimator needs to consider the requirements of optical principles and optical systems. Optical design involves the selection and arrangement of elements such as lenses, reflectors, and optical sheets to ensure precise collimation and focusing of the laser beam. Currently, laser 3D printing (SLM) basically uses single-mode fiber lasers of 300-1000W, and the output beam is a typical Gaussian beam. When the Gaussian beam interacts with metal powder, it will produce a very large temperature gradient due to the high central power density, thereby increasing the thermal stress of the printed parts. This Gaussian beam will not only produce more spatter when interacting with the metal, but also form keyholes. The keyholes will produce bubbles in the molten pool, forming pore defects, resulting in a decrease in the quality of the printed parts, which can easily affect the ease of use of the entire laser collimator. Utility Model Content

[0003] In order to overcome the problem that during the use of the laser collimator, the thermal stress of the printed parts will be increased, which will not only produce more spatters, but also form keyholes. The keyholes will produce bubbles in the molten pool, forming pore defects, resulting in a decrease in the quality of the printed parts.

[0004] The technical solution of the utility model is: a laser collimator for additive manufacturing, including a collimator body, a QBH interface, a divergence angle fine-tuning module, a connecting sleeve, a water-cooled mirror cavity, a laser collimator lens assembly and an output threaded interface, the inner left end of the collimator body is threadedly connected with the QBH interface, the outer side wall right end of the collimator body is threadedly connected with the connecting sleeve, and the laser collimator lens assembly is arranged inside the water-cooled mirror cavity.

[0005] Preferably, by setting a divergence angle fine-tuning module, a rotatable adjustment structure is used to fine-tune the distance between the laser fiber plug and the laser collimator assembly. The water-cooled mirror cavity can ensure the coaxiality and thermal stability of the entire optical path. Then, through the laser collimator assembly, the first conical lens and the second conical lens adopt the same design parameters and are installed relatively in plane. After the conical lens group beam is shaped, the output is a circular spot with a diameter of 19mm and a thickness of 5mm. The spacer can effectively reduce the direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage. The output threaded interface is convenient for subsequent application connection, which can greatly improve the ease of use of the entire laser collimator.

[0006] Preferably, the entire collimator body is made of metal alloy, which provides good heat resistance and corrosion resistance and can withstand high-power laser collimators.

[0007] Preferably, a divergence angle fine-tuning module is provided between the collimator body and the QBH interface, and the rotatable adjustment structure is used to fine-tune the distance between the laser fiber plug and the laser collimator lens assembly.

[0008] Preferably, a water-cooled mirror cavity is provided inside the connecting sleeve to ensure the coaxiality and thermal stability of the entire optical path.

[0009] Preferably, the laser collimator assembly includes a single plano-convex lens, a No. 1 conical lens, a No. 2 conical lens, an output window mirror and a spacer ring. The right end of the single plano-convex lens is sequentially arranged as a No. 1 conical lens, a No. 2 conical lens and an output window mirror. The No. 1 conical lens and the No. 2 conical lens use the same design parameters and are installed relative to each other in a plane. After beam shaping by the conical lens group, the output is a circular spot with a diameter of 19 mm and a thickness of 5 mm.

[0010] Preferably, spacers are provided between the single-piece plano-convex lens, the first conical lens, the second conical lens and the output window mirror, which can effectively reduce direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage.

[0011] Preferably, the inner right end of the connecting sleeve is threadedly connected with an output threaded interface, and the thread is M42×0.75 to facilitate subsequent application connection.

[0012] Beneficial effects of the utility model:

[0013] 1. By setting up a composite structure of a divergence angle fine-tuning module, a water-cooled mirror cavity, a laser collimator assembly and an output threaded interface to replace the original single structure, the distance between the laser fiber plug and the laser collimator assembly can be fine-tuned, the coaxiality and thermal stability of the entire optical path can be ensured, and the direct contact and friction between the lenses can be effectively reduced, and subsequent application connections can be facilitated, thereby improving the convenience of the entire laser collimator to a certain extent;

[0014] 2. Through the divergence angle fine-tuning module, the structure can be rotated to fine-tune the distance between the laser fiber plug and the laser collimator assembly;

[0015] 3. Through the water-cooled mirror cavity, in order to ensure the coaxiality and thermal stability of the entire optical path;

[0016] 4. Through the laser collimator assembly, the first cone lens and the second cone lens adopt the same design parameters and are installed oppositely in plane. After the beam is shaped by the cone lens group, the output is a circular spot with a diameter of 19mm and a thickness of 5mm. The spacer can effectively reduce the direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage;

[0017] 5. Through the output thread interface, the thread is M42×0.75 to facilitate subsequent application connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 What is shown is a three-dimensional structural schematic diagram of the utility model;

[0019] Figure 2 What is shown is a schematic diagram of the internal cross-section three-dimensional structure of the utility model;

[0020] Figure 3 The figure shows a three-dimensional structure diagram of the connection sleeve installation of the utility model;

[0021] Figure 4 The figure shows a schematic diagram of the three-dimensional structure of the laser collimator assembly of the utility model;

[0022] Figure 5 What is shown is a schematic diagram of the disassembled three-dimensional structure of the laser collimator lens assembly of the utility model.

[0023] Explanation of the reference numerals: 1-collimator body, 2-QBH interface, 3-divergence angle fine-tuning module, 4-connecting sleeve, 5-water-cooled mirror cavity, 6-laser collimator lens assembly, 7-output threaded interface, 601-single-piece plano-convex lens, 602-conical lens No. 1, 603-conical lens No. 2, 604-output window mirror, 605-spacer. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-3 The utility model provides an embodiment: a laser collimator for additive manufacturing, including a collimator body 1, a QBH interface 2, a divergence angle fine-tuning module 3, a connecting sleeve 4, a water-cooled mirror cavity 5, a laser collimator lens assembly 6 and an output threaded interface 7. The collimator body 1 is made of a metal alloy as a whole, which provides good heat resistance and corrosion resistance and can withstand high-power laser collimators. The QBH interface 2 is threadedly connected to the left end of the interior of the collimator body 1. A divergence angle fine-tuning module 3 is arranged between the collimator body 1 and the QBH interface 2. The rotatable adjustment structure is used to fine-tune the distance between the laser fiber plug and the laser collimator lens assembly 6. The right end of the outer wall of the collimator body 1 is threadedly connected to the connecting sleeve 4. A water-cooled mirror cavity 5 is opened inside the connecting sleeve 4 to ensure the coaxiality and thermal stability of the entire optical path.

[0026] See also Figure 4-5 In this embodiment, the laser collimator lens assembly 6 is arranged inside the water-cooled mirror cavity 5. The laser collimator lens assembly 6 includes a single-piece plano-convex lens 601, a first conical lens 602, a second conical lens 603, an output window mirror 604 and a spacer 605. The right end of the single-piece plano-convex lens 601 is sequentially arranged with a first conical lens 602, a second conical lens 603 and an output window mirror 604. The first conical lens 602 and the second conical lens 603 use the same design parameters and are installed relative to each other in plane. After the group beam is shaped, the output is a circular spot with a diameter of 19mm and a thickness of 5mm. Spacers 605 are provided between the single-piece plano-convex lens 601, the first conical lens 602, the second conical lens 603 and the output window mirror 604, which can effectively reduce the direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage. The inner right end of the connecting sleeve 4 is threadedly connected to an output threaded interface 7, and the thread is M42×0.75 to facilitate subsequent application connections.

[0027] When the laser collimator is working, firstly, the collimator body 1 is made of metal alloy as a whole, which provides good heat resistance and corrosion resistance, and can withstand high-power laser collimator. Then, a divergence angle fine-tuning module 3 is arranged between the collimator body 1 and the QBH interface 2, and the rotatable adjustment structure is used to fine-tune the distance between the laser fiber plug and the laser collimator lens assembly 6. The right end of the outer wall of the collimator body 1 is threadedly connected with a connecting sleeve 4, and a water-cooled mirror cavity 5 is opened inside the connecting sleeve 4 to ensure the coaxiality and thermal stability of the entire optical path;

[0028] Then, through the laser collimator assembly 6, the first conical lens 602 and the second conical lens 603 adopt the same design parameters and are installed in opposite planes. After the beam is shaped by the conical lens group, the output is a circular spot with a diameter of 19 mm and a thickness of 5 mm. Spacers 605 are provided between the single-piece plano-convex lens 601, the first conical lens 602, the second conical lens 603 and the output window mirror 604, which can effectively reduce direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage;

[0029] The right end of the inner part of the connecting sleeve 4 is threadedly connected with an output threaded interface 7, the thread of which is M42×0.75, to facilitate subsequent application connection.

[0030] Through the above steps, a divergence angle fine-tuning module 3 is set, and the rotatable adjustment structure is used to fine-tune the distance between the laser fiber plug and the laser collimator lens assembly 6. A water-cooled mirror cavity 5 is opened inside the connecting sleeve 4. In order to ensure the coaxiality and thermal stability of the entire optical path, the laser collimator lens assembly 6 is then used. The first conical lens 602 and the second conical lens 603 use the same design parameters and are installed relatively in a plane. After the conical lens group beam is shaped, the output is a circular spot with a diameter of 19mm and a thickness of 5mm. The spacer 605 can effectively reduce the direct contact and friction between the lenses, thereby reducing potential damage and wear, and helping to protect the lens surface from scratches or other damage. The internal right end of the connecting sleeve 4 is threadedly connected with an output threaded interface 7 to facilitate subsequent application connections, thereby greatly improving the ease of use of the entire laser collimator.

[0031] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the purpose of the present invention.

Claims

1. A laser collimator for additive manufacturing, comprising a collimator body (1); characterized in that: The invention also comprises a QBH interface (2), a divergence angle fine-tuning module (3), a connecting sleeve (4), a water-cooled mirror cavity (5), a laser collimator lens assembly (6) and an output threaded interface (7); the QBH interface (2) is threadedly connected to the left end of the interior of the collimator body (1); the connecting sleeve (4) is threadedly connected to the right end of the outer wall of the collimator body (1); and the laser collimator lens assembly (6) is arranged inside the water-cooled mirror cavity (5).

2. The laser collimator for additive manufacturing according to claim 1, characterized in that: The collimator body (1) is made entirely of metal alloy.

3. The laser collimator for additive manufacturing according to claim 1, characterized in that: A divergence angle fine-tuning module (3) is provided between the collimator body (1) and the QBH interface (2).

4. The laser collimator for additive manufacturing according to claim 1, characterized in that: A water-cooled mirror cavity (5) is provided inside the connecting sleeve (4).

5. The laser collimator for additive manufacturing according to claim 1, characterized in that: The laser collimator assembly (6) comprises a single plano-convex lens (601), a first conical lens (602), a second conical lens (603), an output window mirror (604) and a spacer (605). The right end of the single plano-convex lens (601) is sequentially provided with the first conical lens (602), the second conical lens (603) and the output window mirror (604). The first conical lens (602) and the second conical lens (603) adopt the same design parameters and are installed in a plane relative to each other.

6. The laser collimator for additive manufacturing according to claim 5, characterized in that: Spacers (605) are arranged between the single-piece plano-convex lens (601), the first conical lens (602), the second conical lens (603) and the output window mirror (604).

7. The laser collimator for additive manufacturing according to claim 1, characterized in that: The right end of the inner part of the connecting sleeve (4) is threadedly connected with an output thread interface (7), and the thread is M42×0.75.

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