Full-automatic measuring device for additive parts and use method of full-automatic measuring device

Abstract

The invention relates to an additive part full-automatic measuring device and a using method thereof, and belongs to the field of non-contact measurement. According to the system, discrete layout is innovatively adopted on a rack; a workpiece posture transformation unit consisting of a turntable and a rotating mechanism is arranged on one side; a binocular camera is fixed on the other side; and a lifting scanning unit with a line laser contourgraph is arranged between the two. During measurement, the control system drives the rotary table to rotate in an indexing mode, visual photographing and laser vertical scanning are synchronously triggered at each station, and multi-view-angle images and contour point clouds are automatically obtained. And during data processing, high-precision feature coordinates calculated by a visual image are used as a global reference, the multi-angle laser point cloud is guided to perform accurate and automatic splicing, and finally, a complete three-dimensional model and a key feature size report of the part are synchronously generated. According to the invention, the integration of efficient and full-automatic overall shape scanning and local feature accurate measurement of the additive part is realized, and the problems of low efficiency, complicated operation and insufficient data splicing precision in the prior art are solved.

Description

Technical Field

[0001] This invention belongs to the field of non-contact measurement, and in particular relates to a fully automatic measurement device for additive parts and its usage method. Background Technology

[0002] Additive manufacturing technology constructs parts by layering materials, offering great design freedom and enabling the creation of complex structures that are difficult or even impossible to achieve with traditional subtractive manufacturing processes. However, the inherent thermal stress, material shrinkage, and interlayer bonding characteristics of this process inevitably introduce dimensional deviations, shape distortions, and surface defects. Therefore, rigorous geometric accuracy inspection of the formed parts is a crucial step in ensuring their functionality and assembly reliability, and a prerequisite for closed-loop control and optimization of the printing process.

[0003] Currently, the industry primarily relies on two technological approaches for inspection, each with its significant limitations. The first approach uses a coordinate measuring machine (CMM). This equipment uses a precision probe to sample a single point on the part's surface, offering extremely high measurement accuracy and repeatability, making it the authoritative tool for dimensional measurement. However, its contact-based measurement principle poses risks when dealing with additive parts containing residual powder, soft textures, or those with fine, deep, and narrow internal cavities. These risks include surface scratches, probe failure to reach certain areas, or distorted data. More significantly, its point-by-point sampling mode results in extremely low measurement efficiency. For situations requiring the collection of massive amounts of data to describe complex surfaces, the time consumption is unacceptable, severely restricting production cycle time.

[0004] The second approach involves non-contact optical scanning technologies, such as laser scanners or structured light scanners. These technologies can quickly acquire dense point cloud data of a part's surface, far exceeding the efficiency of contact measurements. However, in practical applications, to obtain complete 3D data of a single part, its surface must be scanned from multiple angles. Existing solutions either require operators to manually flip and move the part, heavily relying on human experience and introducing inconsistencies, or require placing the part on a multi-degree-of-freedom turntable and using complex multi-axis linkages to avoid scanning blind spots. While the latter approach achieves a degree of automation, its motion control is complex, its scanning path planning requirements are high, and the stitching accuracy of point cloud data from different perspectives heavily depends on the turntable's calibration accuracy and repeatability, posing challenges to the overall system's stability and reliability.

[0005] More importantly, many additive manufacturing parts require more than just an external shell; the tolerances for critical dimensions such as precision-machined holes, assembly locating surfaces, and shaft mating features are even more stringent. Existing scanning technologies often fail to meet engineering requirements for accurately determining the precise coordinates of these local features in the overall point cloud model. In other words, the market lacks an automated solution that seamlessly integrates "high-efficiency overall topography scanning" with "high-precision local feature measurement." Existing profile part measurement methods either sacrifice efficiency for accuracy or vice versa; this dilemma is precisely the technological barrier that this invention aims to overcome. Summary of the Invention

[0006] To address the gaps and deficiencies in the existing technologies, the primary objective of this invention is to provide an innovative fully automated 3D measurement system for additive manufacturing parts. This system is not a simple aggregation of existing components, but rather an automated workstation specifically designed for additive manufacturing part measurement, constructed through a novel, modular, and specialized hardware architecture and integrated collaborative control logic. Its core design philosophy is "simplification and divide-and-conquer": the complex "multi-axis linkage scanning" is decomposed into a simple combination of "single-axis rotation (workpiece) plus single-axis translation (scanning head)," and a fixed vision module provides a global spatial reference and feature coordinate anchor points for the entire measurement process. This ensures extremely high measurement accuracy while achieving extreme simplification of the operation process and a significant improvement in efficiency.

[0007] Another objective of this invention is to provide a measurement method for use with this system. This method defines a clear, stable, and repeatable set of procedural steps. From workpiece clamping and data acquisition to preliminary processing, the entire process requires no manual intervention and can output a complete three-dimensional digital model of the part and a report on key dimensions, truly achieving "one-click measurement".

[0008] To achieve the above-mentioned objectives, the specific technical solution adopted by the present invention is as follows: On the one hand, an automated measuring device for additive manufacturing parts, the device comprising: Rack platform; The workpiece posture transformation unit is installed on the frame platform and is used to carry and drive the workpiece to be tested to perform indexing rotational motion. The three-dimensional contour scanning unit includes an automatic lifting mechanism that performs linear motion and a line laser contour scanner mounted thereon. The automatic lifting mechanism is fixedly mounted on the first side of the frame platform. The visual feature extraction unit includes a binocular camera, which is fixedly installed on the second side of the frame platform opposite to the first side, and its field of view covers the workpiece on the workpiece posture transformation unit. The collaborative control system, electrically connected to the workpiece posture transformation unit, the three-dimensional contour scanning unit, and the visual feature extraction unit, is configured to: control the workpiece posture transformation unit to rotate the workpiece to a preset division angle and stabilize it, and then synchronously or sequentially trigger the three-dimensional contour scanning unit to perform scanning and the visual feature extraction unit to acquire images.

[0009] Furthermore, the frame platform includes a chassis and a column-type frame; the chassis has a square structure; the column-type frame is a gantry structure built of profiles, straddling the chassis.

[0010] Furthermore, the workpiece posture transformation unit includes a rotating mechanism and a turntable mounted thereon.

[0011] Furthermore, the turntable is equipped with a quickly replaceable magnetic clamp.

[0012] Furthermore, the magnetic clamp is a detachable structure, and its configuration includes "Z" type and "L" type, which are used to fix additive parts under test with different structures.

[0013] Furthermore, the surface of the turntable is a matte surface to reduce laser reflection.

[0014] Furthermore, the automatic lifting mechanism is a precision ball screw linear module, and the laser line length of the line laser profilometer is greater than half the maximum width of the part to be measured.

[0015] Furthermore, the binocular camera is fixedly mounted on the crossbeam of the frame platform, with its lens optical axis horizontally aligned with the rotation center of the workpiece posture transformation unit.

[0016] On the other hand, a method of using the fully automated measuring device for additive parts includes the following steps: S1: Fix the workpiece to be tested onto the workpiece posture transformation unit; S2: The collaborative control system executes an automated measurement cycle: the workpiece posture transformation unit is controlled to rotate the workpiece by one division angle and stabilize it, and then the three-dimensional contour scanning unit is triggered to perform a scan on the workpiece, while the visual feature extraction unit is triggered to acquire a stereo image from that perspective; S3: Repeat step S2 until the workpiece rotates to the preset total angle; S4: Process all stereo images acquired by the visual feature extraction unit to obtain the three-dimensional coordinates of preset key feature points on the workpiece; based on the coordinates of the key feature points, register and fuse the point cloud data acquired by the three-dimensional contour scanning unit at all angles to generate a complete three-dimensional point cloud model of the workpiece.

[0017] Furthermore, in step S4, the three-dimensional coordinates of the key feature points are used as initial transformation parameters to guide the global registration of multi-view point cloud data.

[0018] The benefits of this invention are multi-layered and significant. First, it achieves a high degree of automation and standardization in the inspection process, freeing technicians from tedious repetitive operations and significantly improving inspection efficiency. It is particularly suitable for online or offline full inspection of batch parts, greatly reducing labor costs. Second, it creatively combines a global visual coordinate reference with local laser scanning, laying a high-precision foundation in its hardware architecture. The stable feature points provided by the fixed vision system fundamentally solve the problem of cumulative errors in data stitching during multi-view scanning, achieving a synergistic measurement effect of "1+1>2," that is, simultaneously obtaining the high density of laser scanning and the high precision of visual measurement. Furthermore, the mechanical motion of the entire system is simplified into two independent single-axis movements, with simple and reliable control logic. The equipment manufacturing cost and maintenance complexity are far lower than those of robotic scanning systems that require multi-axis linkage. In addition, the anti-reflective bearing plate and flexible quick-release fixture designed for additive parts demonstrate profound technological expertise, directly addressing industry pain points and greatly enhancing the system's practicality and ease of use. In summary, this invention provides a dedicated measurement solution that achieves an excellent balance between accuracy, efficiency, reliability, and cost, effectively filling a key gap in the existing additive manufacturing quality inspection technology chain. Attached Figure Description

[0019] Figure 1 Isometric drawing for a fully automated measuring device for additive manufacturing parts; Figure 2 Left view of the fully automated measuring device for additive manufacturing parts; Figure 3 A schematic diagram of a "Z"-shaped magnetic clamp; Figure 4 A schematic diagram of an "L"-shaped magnetic clamp; Explanation of reference numerals in the attached figures: 1. Chassis; 2. Column frame; 3. Rotating mechanism; 4. Turntable; 5. Magnetic clamp; 6. Automatic lifting mechanism; 7. Line laser profilometer; 8. Binocular camera; 9. Clamp body; 10. Pressure device; 11. Magnet. Detailed Implementation

[0020] These embodiments are provided to make the invention thorough and complete, and to fully express the scope of the invention to those skilled in the art. It should be noted that, unless otherwise specifically stated, the relative arrangement of components and steps, material composition, numerical expressions, and values ​​set forth in these embodiments should be interpreted as merely exemplary and not as limiting.

[0021] This invention provides a fully automated measurement device for additive manufacturing parts and its method of use. Specifically, the fully automated measurement system for additive manufacturing parts has a frame structure with high rigidity and stability as its physical carrier. This frame structure is typically a gantry-style column frame 2 constructed from a heavy-duty aluminum alloy chassis 1 and robust aluminum profiles. This design effectively isolates external vibration interference, providing a stable mechanical foundation for precision measurement.

[0022] At the center of the frame structure is the workpiece posture transformation unit of this system. Its core is a high-precision rotating mechanism 3, precisely driven by a servo motor, which is rigidly mounted on the center of the base plate via a flange. Above the rotating mechanism 3 is a specially surface-treated circular support plate (i.e., turntable 4). This turntable 4 is made of stainless steel, and its surface is not a bright mirror finish, but rather treated with sandblasting or precision wire drawing to form a uniform diffuse reflective surface. This design detail aims to minimize specular reflection interference that may occur during laser scanning, ensuring the quality of point cloud data. The support plate is designed with modular quick-clamping areas, such as evenly distributed grid-like threaded holes or strong magnetic adsorption areas, for mounting various interchangeable magnetic clamps 5.

[0023] On one of the columns of the column-type frame 2, the three-dimensional contour scanning unit of this system is installed perpendicularly to the ground. The main body of this unit is a precision automatic lifting mechanism 6 driven by another servo motor, preferably using a high-precision ball screw transmission to ensure smooth movement and positioning accuracy. On the moving slide of this automatic lifting mechanism 6, a line laser profilometer 7 is firmly installed. The optical lens axis of this profilometer is precisely adjusted to be parallel to the radial direction of the turntable 4. The fan-shaped laser surface generated by its laser line generator unfolds in a direction perpendicular to the ground, and its length is calculated to ensure that it can cover the maximum possible size of the part under test in the scanning direction.

[0024] On the column-type frame 2, on the opposite side (usually the other column or the middle crossbeam) opposite the aforementioned automatic lifting mechanism 6, the visual feature extraction unit of this system is fixedly installed. This unit is a pre-calibrated binocular stereo vision system containing two industrial-grade binocular cameras 8. Their mounting baselines are kept horizontal, and the intersection area of ​​the optical axes of the two cameras is precisely adjusted to align with the rotation center of the turntable 4 below. This vision system maintains an absolutely fixed spatial position throughout the measurement process.

[0025] All the aforementioned mechanical units—rotating mechanism 3, automatic lifting mechanism 6, line laser profilometer 7, and binocular camera 8—are connected to a unified, coordinated control system via electrical wiring. This system typically consists of an industrial computer, motion control card, data acquisition card, and corresponding control software. Its program logic does not simply involve sequentially activating each component; rather, it involves the components working collaboratively. The core loop of its control flow is as follows: First, the rotating mechanism 3 is commanded to rotate the part by a preset, fixed angle (e.g., 30 degrees) and precisely lock it, waiting for a brief period of mechanical vibration to subside. Then, within the same control cycle, two actions are triggered simultaneously—the linear module is commanded to move the line laser profilometer 7 along the column at a uniform speed from top to bottom to complete a vertical profile scan, while the binocular camera 8 captures a pair of high-definition stereo images while the part is stationary. This cycle of "rotation-stabilization-synchronous scanning and imaging" repeats automatically until the support plate, carrying the part, completes a full rotation and returns to its origin. At this point, the system automatically collected multi-line laser point cloud data covering the entire outer surface of the part in a circular distribution, as well as multiple sets of stereo image pairs taken from the corresponding perspectives, without human intervention.

[0026] Based on the above system, the measurement method of this invention naturally follows. After automatic data acquisition is completed, dedicated data processing software begins operation. It first processes all image pairs captured by the binocular camera 8, using the principle of stereo vision triangulation to accurately calculate the three-dimensional coordinates of various key features (such as the center of a circular hole, the corner points of a square groove, and the center of the top surface of a boss) pre-defined by the operator in the part's CAD model, within the current camera coordinate system. These high-precision feature point coordinates become crucial feature coordinates in subsequent point cloud data processing. Subsequently, the software imports the contour line point cloud, grouped by angle, acquired by the line laser profilometer 7. Using the stable and reliable feature point coordinates provided by binocular vision at different angles as a forced constraint and initial registration benchmark, the software can very accurately stitch and fuse the contour line point clouds from all angles into a complete, unified, and seamless three-dimensional point cloud digital model. This model not only fully expresses the shape of the part, but also ensures overall dimensional accuracy due to the constraint of high-precision visual coordinates during the stitching process. Ultimately, the system can output this 3D model along with an inspection report containing precise dimensions of key features. It can also compare the model with the original design CAD drawings to generate an intuitive color deviation cloud map.

[0027] Example 1: refer to Figure 1 and Figure 2The measurement system constructed in this invention is based on a rigid frame optimized through finite element analysis. The chassis 1 is a square, 500 mm long and wide, precision-machined from 6061-T6 aluminum alloy plate with a thickness exceeding 30 mm using a CNC milling machine. Damping and shock-absorbing feet can be installed on its bottom surface. Four 40 mm × 40 mm industrial-grade high-strength aluminum profiles serve as columns, rigidly connected to the four corners of the chassis plate using high-strength hexagonal bolts. The top is constructed using identical aluminum profiles and connectors to form a robust "gate"-shaped crossbeam, ultimately forming a gantry frame, i.e., the column-type frame 2. The entire frame requires stress release and leveling after assembly.

[0028] Exemplary, a precision-bored mounting hole is provided at the geometric center of chassis 1. A hollow-shaft integrated servo-electric rotary table, serving as the servo rotation mechanism 3, is mounted via a set of flanges and stop fittings. This rotary table has a rotational accuracy better than ±5 arcseconds and a repeatability better than ±2 arcseconds. A 400mm diameter circular load-bearing turntable 4 is concentrically mounted on the flange face of the turntable's output shaft via locating pins and bolts. This turntable 4 is made of 304 stainless steel, and its upper working surface is treated with professional sandblasting equipment to achieve a uniform matte finish (surface roughness Ra value approximately 1.6μm). The upper surface of turntable 4 is engraved with radial and concentric positioning reference lines centered on the rotation center, and is covered with M6 threaded holes and magnet insertion points arranged in a specific matrix, providing great flexibility for fixture installation.

[0029] As an example, clamping systems are crucial for connecting parts to equipment. For example... Figure 3 As shown, for irregularly shaped parts that require side clamping, we designed a "Z"-shaped magnetic clamp 5. The clamp body 9 is a steel component bent into a "Z" shape, with its lower part fixed to the turntable 4 by bolts or direct adsorption. A clamping device 10 with fine threads passes through a threaded hole at the top of the body, and its end is equipped with a replaceable nylon or copper contact. Controllable clamping force can be applied to the part by rotation. A powerful neodymium iron boron magnet 11 is embedded inside the clamp body 9, ensuring its firm adsorption on the steel turntable 4, achieving "instant replacement". Figure 4 The "L" shaped clamp shown is similar in principle but has a simpler structure. Its vertical side is used for positioning, and its horizontal side is fixed by magnet 11. It is suitable for flat parts.

[0030] Exemplary, on the right side of column frame 2 (with) Figure 1From a certain perspective, a precision ball screw linear module (i.e., automatic lifting mechanism 6) with a stroke of 300 mm is mounted on a machined aluminum strip as a transition support. The guide rail mounting surface of this module has been calibrated with a dial indicator during assembly to ensure that the perpendicularity error between its movement trajectory and the upper surface of the chassis 1 is less than 0.02 mm / 300 mm. On the moving slide of the module, a line laser profilometer 7 with a laser line length of 100 mm is fixed by a finely adjustable mounting seat. The adjusting set screw on the mounting seat is used to finely adjust the angle of the laser sector, ensuring that it always passes perpendicularly through the rotation center axis of the turntable 4 throughout the entire lifting stroke.

[0031] As an example, a set of binocular cameras 8 is mounted on another crossbeam of the column-type frame 2, opposite the automatic lifting mechanism 6. Two 5-megapixel global shutter CMOS sensor cameras are rigidly fixed to both ends of the crossbeam. The cameras are equipped with 12mm fixed-focus industrial lenses, with the aperture adjusted to the optimal depth of field. During the final calibration of the system, a high-precision 3D calibration board is used, and through complex algorithms, the internal parameters (focal length, distortion, etc.) and external relative positional relationships (rotation matrix and translation vector) of the two cameras are accurately solved, establishing a high-precision stereo vision measurement model. The support is adjusted so that the common field of view of the two cameras perfectly covers an area with a diameter of approximately 150mm in the center area of ​​the turntable 4.

[0032] As an example, all the aforementioned electrical components are connected to the control cabinet. The core of the collaborative control system is an industrial computer equipped with a multi-core processor, whose expansion slots hold a high-speed motion control card and a gigabit Ethernet image acquisition card. The motion control card controls the servo drives of the rotating mechanism 3 and the automatic lifting mechanism 6 via pulse sequences; the line laser profilometer 7 transmits high-speed point cloud data via an Ethernet interface; and the binocular camera 8 transmits images via the GigE Vision protocol. All hardware is scheduled by a set of independently developed measurement software.

[0033] As an example, the operation and execution process of the software is as follows: After starting the system, the operator first selects a suitable magnetic clamp 5 to install the printed additive part, which is still attached to the metal substrate, onto the turntable 4 according to its shape, and manually (or with auxiliary tools) pushes the part to the center area of ​​the turntable 4, then tightens the clamp 10. Subsequently, the operator clicks "Start Measurement" on the software interface. The software first sends a command to the motion control card to drive the turntable 4 to rotate to the mechanical zero position (defined as "0"), and drives the automatic lifting mechanism 6 to raise the line laser profilometer 7 to the "upper limit" safety position at the top of its stroke, waiting 2 seconds for the mechanism to come to a complete stop.

[0034] As an example, the measurement cycle then begins. The software performs the following operations sequentially according to a preset graduation plan (e.g., 12 stations per 30 degrees): (1) Control the turntable to rotate 30 degrees and position it precisely; (2) Wait 2 seconds for a delay to eliminate residual vibration; (3) After this delay, the software sends two trigger signals almost simultaneously: the first signal starts the automatic lifting mechanism 6 to move downwards at a constant speed of 50 mm / s. When the line laser profiler 7 moves to the "lower limit" position (confirmed by the limit sensor), it immediately reverses and returns to the starting point at a constant speed. During this reciprocating process, the line laser profiler 7 continuously outputs the two-dimensional profile coordinate data formed by the laser line illuminating the surface of the part at a frequency of 10 kHz; the second signal triggers the binocular camera 8 to perform a one-time exposure and acquire a pair of high-resolution stereo images. One cycle ends. After the linear module returns to the origin and stops, the software immediately starts the next rotation and begins the measurement of the next indexing position. This process repeats until the turntable 4, carrying the part, rotates 360 degrees and returns to the initial "0" position, at which point the entire automatic acquisition process ends.

[0035] As an example, the next step is the software's post-processing stage. The processing thread first calls the stereo vision processing module to perform real-time analysis on the 12 pairs of acquired images. Using a feature matching algorithm, preset part features are identified in each pair of images (e.g., using edge detection to locate circular holes and then fitting the center using the least squares method). Then, using a pre-calibrated binocular vision model, the three-dimensional coordinates (Xc, Yc, Zc) of each feature point in the "binocular camera coordinate system" are precisely calculated. These coordinate data are saved as high-precision spatial reference points.

[0036] As an example, the point cloud processing thread then begins. It reads in 12 sets of contour line data collected by the line laser profilometer 7, each set essentially consisting of thousands of two-dimensional contour lines defined in the "line laser profilometer 7 coordinate system." The core of the processing is multi-view data stitching. Here, the feature point coordinates provided by binocular vision play a crucial role. The software first uses the precise angle information of the turntable to generate a rough initial rotation transformation matrix for each set of point clouds. Then, it iteratively compares and optimizes the coordinates of those feature points visible at that angle, measured by binocular vision, with the corresponding features extracted from the laser point cloud at that angle (such as the center of the same hole fitted from the point cloud). This process, called "feature-constraint-based registration," can significantly correct turntable indexing errors and calibration residual errors, ultimately solving for the optimal transformation matrix that transforms the point cloud at each angle to a globally unified coordinate system. After transforming all point clouds with the optimal matrix, a seamlessly stitched, complete 3D point cloud model is obtained. Finally, the software can generate STL format 3D model files, output a list of dimensions for key features, or perform a 3D comparison with the imported original CAD design model, generating a "chromatogram" report that visually displays dimensional deviations using color gradients, thus completing a full closed loop from physical parts to digital inspection reports.

[0037] The various embodiments of the present invention have now been described in detail. To avoid obscuring the concept of the invention, some details known in the art have not been described. Those skilled in the art can fully understand how to implement the technical solutions of this invention based on the above description.

[0038] It should be noted that, in the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] Furthermore, the terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. "Vertical" is not strictly vertical, but within the permissible range of error. "Parallel" is not strictly parallel, but within the permissible range of error. Terms such as "including" or "comprising" mean that the element preceding the word encompasses the element listed after the word, and do not exclude the possibility of encompassing other elements as well.

[0040] It should also be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device.

[0041] All terms used in this invention have the same meaning as understood by one of ordinary skill in the art to which this invention pertains, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and not as idealized or highly formalized, unless expressly defined herein.

[0042] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0043] While specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments or equivalent substitutions can be made to some technical features without departing from the scope and spirit of the invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any manner.

Claims

1. A fully automatic measuring device for additive manufacturing parts, characterized in that, The device includes: Rack platform; The workpiece posture transformation unit is installed on the frame platform and is used to carry and drive the workpiece to be tested to perform indexing rotational motion. The three-dimensional contour scanning unit includes an automatic lifting mechanism (6) that performs linear motion and a line laser contouring instrument (7) mounted thereon. The automatic lifting mechanism (6) is fixedly mounted on the first side of the frame platform. The visual feature extraction unit includes a binocular camera (8), which is fixedly installed on the second side of the frame platform opposite to the first side, and its field of view covers the workpiece on the workpiece posture transformation unit. The collaborative control system, electrically connected to the workpiece posture transformation unit, the three-dimensional contour scanning unit, and the visual feature extraction unit, is configured to: control the workpiece posture transformation unit to rotate the workpiece to a preset division angle and stabilize it, and then synchronously or sequentially trigger the three-dimensional contour scanning unit to perform scanning and the visual feature extraction unit to acquire images.

2. The fully automatic measuring device for additive manufacturing parts according to claim 1, characterized in that, The frame platform includes a chassis (1) and a column frame (2); the chassis (1) is a square structure; the column frame (2) is a gantry structure built of profiles, straddling the chassis (1).

3. The fully automatic measuring device for additive manufacturing parts according to claim 1, characterized in that, The workpiece posture transformation unit includes a rotating mechanism (3) and a turntable (4) mounted thereon.

4. The fully automatic measuring device for additive manufacturing parts according to claim 3, characterized in that, The turntable (4) is equipped with a detachable magnetic clamp (5).

5. The fully automatic measuring device for additive manufacturing parts according to claim 4, characterized in that, The magnetic clamp (5) is a detachable structure, and its configuration includes "Z" type and "L" type, which are used to fix additive parts under test with different structures.

6. The fully automatic measuring device for additive parts according to claim 4, characterized in that, The surface of the turntable (4) is matte.

7. The fully automatic measuring device for additive manufacturing parts according to claim 1, characterized in that, The automatic lifting mechanism (6) is a ball screw linear module, and the laser line length of the line laser profiler (7) is greater than half the width of the part to be measured.

8. The fully automatic measuring device for additive parts according to claim 2, characterized in that, The binocular camera (8) is fixedly installed on the top crossbeam of the column frame (2) of the frame platform, and its lens optical axis is horizontally aligned with the rotation center of the workpiece posture transformation unit.

9. A method of using the fully automated additive manufacturing part measuring device based on the system described in any one of claims 1-8, characterized in that, Includes the following steps: S1: Fix the workpiece to be tested onto the workpiece posture transformation unit; S2: The collaborative control system executes an automated measurement cycle: the workpiece posture transformation unit is controlled to rotate the workpiece by one division angle and stabilize it, and then the three-dimensional contour scanning unit is triggered to perform a scan on the workpiece, while the visual feature extraction unit is triggered to acquire a stereo image from that perspective; S3: Repeat step S2 until the workpiece rotates to the preset total angle; S4: Process all stereo images acquired by the visual feature extraction unit to obtain the three-dimensional coordinates of preset key feature points on the workpiece; based on the coordinates of the key feature points, register and fuse the point cloud data acquired by the three-dimensional contour scanning unit at all angles to generate a complete three-dimensional point cloud model of the workpiece.

10. The method of use according to claim 9, characterized in that, In step S4, the three-dimensional coordinates of the key feature points are used as initial transformation parameters to guide the global registration of multi-view point cloud data.

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