Galvanometer calibration device

Abstract

The utility model belongs to the field of additive manufacturing relates to a galvanometer calibration device, including the galvanometer calibration board of synchronous movement with scraper frame on scraper frame. The utility model provides a galvanometer calibration device that can improve calibration accuracy and reduce standby time of equipment.

Description

Technical Field

[0001] This utility model belongs to the field of additive manufacturing and relates to a calibration device, particularly a galvanometer calibration device. Background Technology

[0002] Currently, the laser scanning system of PBF (Pulse Filter Fabric) equipment requires operators to periodically calibrate the galvanometer scanning accuracy due to factors such as vibration interference and operating temperature drift. Patent application CN117020401 A discloses a galvanometer calibration method and device, which includes adjusting the scanning system of the galvanometer to be calibrated so that the emitted light from the galvanometer is directed towards the calibration device; controlling the galvanometer to be calibrated so that the emitted light scans at equal intervals along the X and Y directions within the measurement aperture of the calibration device to acquire multiple scan lines; and calibrating the galvanometer to be calibrated sequentially based on the number of scan lines in the two directions and the response time of the scan lines. However, the calibration device disclosed in this patent is often quite large in size in order to cover the entire galvanometer scanning area. This increases the complexity of the calibration equipment, leading to higher processing costs and increased processing difficulty. Furthermore, the larger size results in a heavier calibration equipment, making it difficult for operators to level the focal plane of the galvanometer scan. The galvanometer calibration method disclosed in this patent conflicts with the printing of parts in terms of time and lacks the function of online monitoring and calibration of galvanometer accuracy errors during the printing process, thus increasing the equipment's standby time. Utility Model Content

[0003] In order to solve the above-mentioned technical problems in the background art, the present invention provides a galvanometer calibration device that can improve calibration accuracy and reduce equipment standby time.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A galvanometer calibration device, characterized in that: the galvanometer calibration device includes a galvanometer calibration plate placed on a scraper holder and moving synchronously with the scraper holder.

[0006] The projection of the trajectory of the aforementioned galvanometer calibration plate as it moves synchronously with the scraper frame covers the entire scanning area of ​​the galvanometer.

[0007] The aforementioned galvanometer calibration plate is fixedly mounted on the top of the scraper holder or on the side of the scraper holder.

[0008] When the galvanometer calibration plate is fixedly mounted on the top of the scraper holder, at least two positioning pins are provided on the top of the scraper holder; the galvanometer calibration plate is fixedly mounted on the top of the scraper holder by the positioning pins.

[0009] When the galvanometer calibration plate is fixed to the side of the scraper holder, at least two positioning pins are provided on the side of the scraper holder, and the galvanometer calibration plate is fixedly mounted on the side of the scraper holder by the positioning pins.

[0010] When the aforementioned galvanometer calibration plate is fixed to the side of the scraper holder, one or more reinforcing ribs are provided between the galvanometer calibration plate and the scraper holder; when there are multiple reinforcing ribs, the multiple reinforcing ribs are arranged in parallel.

[0011] The aforementioned galvanometer calibration plate is provided with one or more measurement holes, and when there are multiple measurement holes, the multiple measurement holes are distributed in a matrix.

[0012] A sensor is installed in the aforementioned measuring hole; the sensor is a photoelectric sensor.

[0013] The aforementioned galvanometer calibration device also includes a host computer connected to the sensor.

[0014] The aforementioned sensors are connected to the host computer via a wireless communication module.

[0015] The advantages of this utility model are:

[0016] This invention provides a galvanometer calibration device, including a galvanometer calibration plate placed on a scraper holder and moving synchronously with the scraper holder. This invention mounts the galvanometer calibration plate on the scraper holder, allowing the galvanometer calibration plate to move according to a preset logic, and combines the work of galvanometer accuracy monitoring and calibration with the scraper powder spreading operation, reducing equipment downtime. Simultaneously, since the scraper holder serves as the powder spreading reference for PBF equipment and the focal plane reference for galvanometer scanning, it has high accuracy; therefore, using the scraper holder as the installation reference for the galvanometer calibration device can improve the reliability of galvanometer calibration. Furthermore, this invention has a simpler structure and lower processing costs, achieving cost reduction and efficiency improvement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the working process of the galvanometer calibration device provided by this utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the galvanometer calibration device (top-connected type) provided by this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the galvanometer calibration device (side-connected type) provided by this utility model;

[0020] Figure 4 yes Figure 2 A top-view structural diagram;

[0021] Figure 5 yes Figure 3 A top-view structural diagram;

[0022] Figure 6 This is a schematic diagram showing the galvanometer calibration device provided by this utility model covering the entire scanning area of ​​the galvanometer during operation;

[0023] in:

[0024] 1-Galvanometer scanning system; 2-Forming chamber cavity; 3-Galvanometer calibration plate; 31-Measuring hole; 32-Sensor; 33-Positioning pin; 34-Reinforcing rib; 4-Scraper holder; 5-Signal conversion and host computer communication module Detailed Implementation

[0025] This utility model provides a galvanometer calibration device, including a galvanometer calibration plate 3 placed on a scraper holder 4 and moving synchronously with the scraper holder 4. For example... Figure 1 As shown, when the scraper holder 4 reciprocates in a certain direction inside the forming chamber cavity 2, it will drive the galvanometer calibration plate 3 to move in the same direction. That is, the galvanometer calibration plate 3 moves according to the preset logic. The galvanometer calibration plate 3 can participate in the galvanometer scanning quality detection at regular intervals. Once the quality detection result is greater than the set threshold, it can be determined that the galvanometer has a precision error. The equipment starts to calibrate the galvanometer online without stopping the machine, which reduces the equipment's standby time. At the same time, since the scraper holder 4 serves as the powder spreading and galvanometer scanning focal plane reference of the PBF equipment, its precision is high. Using the scraper holder 4 as the installation reference of the galvanometer calibration plate 3 can improve the reliability of galvanometer calibration.

[0026] See Figure 1 This invention connects the galvanometer calibration plate 3 to the scraper holder 4, maintaining their synchronous movement. Simultaneously, the sensor inside the galvanometer calibration plate 3 is positioned on the focal plane of the galvanometer scan. It should be noted that the plane calibrated by the galvanometer calibration plate 3 coincides with the forming plane. At this time, the projection of the trajectory of the galvanometer calibration plate 3 as it moves synchronously with the scraper holder 4 covers the entire scanning area of ​​the galvanometer. See also... Figure 6 The shaded area represents the entire scanning area of ​​the galvanometer during the printing process (length × width = L × W). The scraper holder 4 drives the galvanometer calibration plate 3 to move from the starting position A, and each movement determines a distance δ until the entire scanning area of ​​the galvanometer is covered.

[0027] See Figure 2 as well as Figure 3 The galvanometer calibration plate 3 is fixedly installed on the top of the scraper holder 4 or fixedly installed on the side of the scraper holder 4.

[0028] For example, see Figure 2 as well as Figure 4When the galvanometer calibration plate 3 is fixedly mounted on top of the scraper holder 4, the scraper holder 4 and the galvanometer calibration plate 3 can be connected by screws, forming a top-connected structure. Simultaneously, at least two positioning pins 33 can be added according to the actual operating conditions and galvanometer calibration accuracy requirements to determine the positional relationship between the calibration device and the scraper holder. The mounting locations of the galvanometer calibration plate 3 and the scraper holder 4 must be free of metal powder contamination to prevent signal interference. For PBF equipment, the lower surface of the scraper is typically used as a reference for the focal plane. Therefore, considering the installation positional relationship between the galvanometer calibration plate 3 and the scraper holder 4 in this preferred embodiment, the collected data needs to be calculated onto the focal plane during galvanometer calibration.

[0029] See Figure 3 as well as Figure 5 When the galvanometer calibration plate 3 is fixed to the side of the scraper holder 4, the scraper holder 4 and the galvanometer calibration plate 3 can be connected by screws. To ensure the stability of the calibration device during scraper operation, one or more reinforcing ribs 34 can be added between the calibration device and the scraper holder. At least two positioning pins 33 can be added according to the actual operating conditions and galvanometer calibration accuracy requirements to determine the positional relationship between the calibration device and the scraper holder. For example, the reinforcing rib 34 can be strip-shaped, with both ends connected to the inclined galvanometer calibration plate 3 and the scraper holder 4 respectively; it can also be triangular, connecting both the galvanometer calibration plate 3 and the scraper holder 4. That is, the structure of the reinforcing rib 34 can adopt any of the existing technologies, which will not be elaborated here. Furthermore, since the galvanometer calibration plate 3 is installed on the side of the scraper holder 4, it does not affect the powder loading or spreading operation of the scraper holder 4, thereby enabling online monitoring of the galvanometer scanning quality and galvanometer accuracy calibration during the powder spreading printing process.

[0030] See Figure 4 as well as Figure 5 The galvanometer calibration plate 3 is provided with one or more measuring holes 31. When there are multiple measuring holes 31, they are arranged in a matrix. For example, an m-row × n-column matrix arrangement can be used, where m and n are both not less than 1. Preferably, the length of the galvanometer calibration plate 3, that is, the total length of the m rows of measuring holes 31, is not less than the width of the forming area. Figure 6 (The shaded area in the text). This application does not limit the specific structure of the calibration plate. For example, the galvanometer calibration plate 3 can be the measurement plate used in publication number CN 117020401 A. In another embodiment, the calibration plate can also be a calibration plate etched with a calibration pattern, and the sensor is disposed on the side of the calibration pattern. In yet another embodiment, the calibration plate can also be a conventional galvanometer calibration plate, and the calibration file is determined by acquiring the actual coordinates through scanning or a coaxial camera. It should be noted that, see... Figure 6The larger n is, the greater the processing cost and difficulty; however, the total number of moves of the calibration plate 3, N+2, will decrease, thereby reducing the galvanometer calibration time. A sensor 32 is provided in the measuring hole 31. The sensor 32 is used to transmit the photoelectric signal of the galvanometer scan to the inside of the measuring hole 31. For example, the sensor 32 can be a photoelectric sensor.

[0031] The galvanometer calibration device also includes a host computer connected to the sensor 32. The sensor 32 can be connected to the host computer via a wireless communication module. For example, the wireless communication module can be existing or conventional technologies such as Bluetooth or infrared. After receiving the photoelectric signal, the sensor inside the galvanometer calibration board 3 can communicate with the signal conversion and host computer communication module 5 using, but not limited to, a Bluetooth module, and convert the photoelectric signal into the aperture coordinates of the calibration device, thereby establishing the global coordinates of the galvanometer scanning area and completing the calibration of the galvanometer scanning system.

[0032] See Figure 6 In practical use, the galvanometer calibration device provided by this utility model operates as follows: By controlling the movement of the scraper holder 4, the galvanometer calibration plate 3 is moved to the starting position A, allowing the laser emitted by the galvanometer scanning system 1 to enter the measuring hole inside the galvanometer calibration plate 3. Subsequently, the galvanometer calibration plate 3 remains at the starting position A, detecting the photoelectric signal excited by the galvanometer scanning system 1 on the galvanometer calibration plate 3, and extracting the hole coordinate position of the first excited photoelectric signal as the reference point for the attitude calibration of the galvanometer scanning system. Finally, the galvanometer calibration plate 3 is controlled to move a certain distance δ each time until the moving area of ​​the galvanometer calibration plate 3 covers the entire galvanometer scanning area, thereby establishing the global coordinates of the galvanometer scanning area and completing the calibration work of the galvanometer scanning system. During the reciprocating powder spreading process of the scraper holder 4, the galvanometer calibration plate 3 participates in the galvanometer scanning quality detection at regular intervals. Once the quality detection result is greater than the threshold, it is determined that the galvanometer has an accuracy error, and the equipment begins online galvanometer calibration without stopping the machine.

Claims

1. A galvanometer calibration device, characterized in that: The galvanometer calibration device includes a galvanometer calibration plate (3) placed on the scraper holder (4) and moving synchronously with the scraper holder (4).

2. The galvanometer calibration device according to claim 1, characterized in that: The projection of the trajectory of the galvanometer calibration plate (3) as it moves synchronously with the scraper holder (4) covers the entire scanning area of ​​the galvanometer.

3. The galvanometer calibration device according to claim 2, characterized in that: The galvanometer calibration plate (3) is fixedly mounted on the top of the scraper holder (4) or on the side of the scraper holder (4).

4. The galvanometer calibration device according to claim 3, characterized in that: When the galvanometer calibration plate (3) is fixedly installed on the top of the scraper holder (4), at least two positioning pins (33) are provided on the top of the scraper holder (4); the galvanometer calibration plate (3) is fixedly installed on the top of the scraper holder (4) by the positioning pins (33).

5. The galvanometer calibration device according to claim 3, characterized in that: When the galvanometer calibration plate (3) is fixed on the side of the scraper holder (4), at least two positioning pins (33) are provided on the side of the scraper holder (4), and the galvanometer calibration plate (3) is fixed on the side of the scraper holder (4) by the positioning pins (33).

6. The galvanometer calibration device according to claim 5, characterized in that: When the galvanometer calibration plate (3) is fixed on the side of the scraper holder (4), one or more reinforcing ribs (34) are provided between the galvanometer calibration plate (3) and the scraper holder (4); when there are multiple reinforcing ribs (34), the multiple reinforcing ribs (34) are arranged in parallel.

7. The galvanometer calibration apparatus according to any one of claims 1-6, characterized in that: The galvanometer calibration plate (3) is provided with one or more measuring holes (31). When there are multiple measuring holes (31), the multiple measuring holes (31) are distributed in a matrix.

8. The galvanometer calibration device according to claim 7, characterized in that: A sensor (32) is provided in the measuring hole (31); the sensor (32) is a photoelectric sensor.

9. The galvanometer calibration device according to claim 8, characterized in that: The galvanometer calibration device also includes a host computer connected to the sensor (32).

10. The galvanometer calibration device according to claim 9, characterized in that: The sensor (32) is connected to the host computer via a wireless communication module.

Images