A device for measuring the elongation of a blade of a blisk

Abstract

The utility model discloses a whole blade disc blade elongation measuring device, including the bottom plate, the top portion of bottom plate is installed rotary platform and mounting bracket gradually from left to right, the mounting bracket is equipped with the sliding mechanism on the sliding, the one side of sliding mechanism is installed drive mechanism through, the telescopic end of drive mechanism installs U -shaped frame. The utility model discloses a non -contact optical measuring structure, realize blade elongation high -precision detection, and optical sensor and blade surface have no physical contact, can avoid the workpiece surface scratch, the probe wear and tear and the deformation error of contact pressure caused by contact type measurement, eliminate the secondary influence to workpiece, adapt to the high -value whole blade disc of surface with special coating, material precision or structure fragile, guarantee workpiece surface integrity and initial geometric accuracy, avoid the potential interference of measurement to the subsequent use performance of blade disc, provide safe and reliable technical scheme for high -value precision component quality detection.

Description

Technical Field

[0001] This utility model mainly relates to the field of integral bladed disk blade detection technology, specifically an integral bladed disk blade elongation measuring device. Background Technology

[0002] As a core component of high-end equipment such as aero-engines, gas turbines, and small turbochargers, integral bladed disks integrate the traditionally separate disk and blades into a single unit, offering significant advantages such as reduced structural weight, improved aerodynamic efficiency, and enhanced structural reliability. However, this integrated structure also means that the manufacturing precision, geometry, and post-service condition changes of individual blades directly affect the performance and lifespan of the entire bladed disk and even the entire power system. Among these parameters, blade elongation is a key parameter for measuring blade machining precision and assessing its thermal deformation and creep elongation under high-temperature and high-speed conditions. It is crucial for ensuring assembly quality, controlling vibration characteristics, and predicting fatigue life.

[0003] Currently, the industry still largely relies on contact measurement methods for inspecting the dimensions of blades in overall bladed disks, especially for measuring the elongation at the blade tips. This involves using probes from coordinate measuring machines (CMMs) or specialized dial indicators and lever gauges in cleanrooms. While these methods are widely used, the measuring probes or heads need to be in direct contact with the blade surface and apply a certain amount of force. For blades with special coatings for oxidation and corrosion resistance, the contact pressure can easily scratch or even peel off the coating, compromising its surface integrity. Furthermore, for high-value precision bladed disks made of softer materials or with thinner structures, the contact pressure may cause minute elastic deformation of the blades themselves, introducing additional measurement errors and failing to accurately reflect the actual geometric state of the blades. Summary of the Invention

[0004] This utility model addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. It primarily offers a device for measuring the elongation of integral bladed disks (IBDs). This addresses the issue raised in the background section where the measurement of IBD blade elongation primarily employs contact methods, such as coordinate measuring machines (CMMs) or mechanical measuring tools. These methods, requiring the probe to directly contact the blade and apply force, are prone to scratching special coating surfaces and may introduce measurement errors due to minute blade deformation caused by contact pressure. Consequently, they fail to meet the testing requirements of high-value, precision IBDs.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A device for measuring the elongation of an integral bladed disk includes a base plate. A rotating platform and a mounting frame are installed sequentially from left to right on the top of the base plate. A sliding mechanism is slidably mounted on the mounting frame. A drive mechanism is installed through one side of the sliding mechanism. A U-shaped frame is installed at the telescopic end of the drive mechanism. A light source assembly and a camera assembly are respectively mounted at the front and rear ends of the U-shaped frame.

[0006] More preferably, the sliding mechanism includes a mounting plate and a sliding plate. The sliding plate is fixed to the bottom of the mounting plate. The top of the mounting frame has a groove adapted to the sliding plate. The sliding plate is slidably assembled in the groove. The sliding plate has a plurality of evenly distributed first holes horizontally near the bottom. The upper part of the mounting frame has a plurality of rows of second holes adapted to the first holes vertically corresponding to the groove. The sliding plate and the mounting frame are detachably fixed by fasteners passing through the first holes and second holes. The first holes and second holes are threaded holes, and the fasteners are bolts adapted to the threaded holes.

[0007] More preferably, the driving mechanism is a cylinder, an electric push rod, or a hydraulic push rod, with the fixed end of the driving mechanism being fixedly connected to the mounting plate through it, and the telescopic end extending horizontally and connected to the center position of the U-shaped frame.

[0008] More preferably, symmetrically distributed guide rods are slidably mounted on the mounting plate at the same side as the drive mechanism, and one end of the guide rods is connected to the corresponding side wall of the U-shaped frame.

[0009] More preferably, the light source assembly is a telecentric parallel light source, and the light-emitting surface of the light source assembly is arranged parallel to the lens end face of the camera assembly, and the central axes of the two are collinear.

[0010] More preferably, the camera assembly is an industrial area array camera, the camera assembly includes a telecentric lens and a filter, the filter being detachably mounted on the light-incident end of the telecentric lens.

[0011] More preferably, the rotary platform is a positioning platform that can rotate around a vertical axis, and its top is provided with a positioning structure that is adapted to the tenon of the integral blade disk.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This integral bladed disk blade elongation measurement device achieves high-precision detection of blade elongation through a non-contact optical measurement structure. During the measurement process, the optical sensor has no physical contact with the blade surface, avoiding problems such as workpiece surface scratches and probe wear that are easily caused by contact measurements. It also avoids minor blade deformation errors caused by contact pressure, eliminating secondary impacts on the workpiece. It is particularly suitable for high-value integral bladed disks with special coatings, precision materials, or fragile structures, ensuring the surface integrity and initial geometric accuracy of the workpiece and preventing potential interference with the subsequent performance of the bladed disk during measurement. This provides a safe and reliable technical solution for the quality inspection of high-value precision components.

[0013] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view structural diagram of the present invention; Figure 3 This is a top view of the structure of this utility model.

[0015] Numbering on the map: 1. Base plate; 2. Rotary platform; 3. Mounting bracket; 4. Sliding mechanism; 5. Drive mechanism; 6. U-shaped frame; 7. Guide rod; 8. Light source assembly; 9. Camera assembly. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0017] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0018] Please refer to the appendix carefully. Figures 1-3A device for measuring the elongation of blades in an integral bladed disk includes a base plate 1 and a control and processing system. A rotating platform 2 and a mounting frame 3 are installed sequentially from left to right on the top of the base plate 1. A sliding mechanism 4 is slidably mounted on the mounting frame 3. A drive mechanism 5 is installed through one side of the sliding mechanism 4. A U-shaped frame 6 is installed at the telescopic end of the drive mechanism 5. A light source assembly 8 and a camera assembly 9 are respectively mounted at the front and rear ends of the U-shaped frame 6.

[0019] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the sliding mechanism 4 includes a mounting plate and a sliding plate. The sliding plate is fixed to the bottom of the mounting plate. The top of the mounting frame 3 is provided with a groove that matches the sliding plate. The sliding plate is slidably assembled in the groove. Near the bottom of the sliding plate, there are multiple evenly distributed first holes. The upper part of the mounting frame 3 is provided with multiple rows of second holes that match the first holes vertically corresponding to the position of the groove. The sliding plate and the mounting frame 3 are detachably fixed by fasteners passing through the first holes and second holes. Both the first holes and the second holes are threaded holes, and the fasteners are bolts that match the threaded holes.

[0020] By using the sliding plate and the sliding groove, the mounting plate, drive mechanism 5, U-shaped frame 6 and optical components can be smoothly and stably raised and lowered in the vertical direction, thereby adapting to and aligning with overall bladed disks of different specifications and sizes, and improving the versatility of the equipment.

[0021] The locking method, which combines multiple rows of spaced threaded holes with bolts, is simple and reliable in structure, with strong locking force. It can prevent the sliding mechanism 4 from sinking unexpectedly due to vibration or its own weight during the measurement process, ensuring the stability and repeatability of the measurement height and providing a solid mechanical foundation for high-precision measurement.

[0022] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the fixed end of the drive mechanism 5 is fixedly connected to the mounting plate, and the telescopic end extends horizontally and connects to the center of the U-shaped frame 6. The drive mechanism 5 is preferably a high-precision servo electric push rod, which integrates a grating encoder for real-time feedback of the displacement position of the U-shaped frame 6, with a positioning accuracy of ±0.01mm. The drive mechanism 5 is electrically connected to the control system to achieve closed-loop control, ensuring the precise positioning and locking of the light source assembly 8 and the camera assembly 9 in the horizontal direction.

[0023] Using cylinders, electric actuators, or hydraulic actuators as the drive source, it can provide stable and controllable linear thrust, enabling precise feeding and retraction of the optical system in the horizontal direction, and facilitating adjustment of the working distance.

[0024] Connecting the telescopic end of the drive mechanism 5 to the center of the U-shaped frame 6 helps to ensure the balance of forces on the U-shaped frame 6 and the optical components on both sides during the pushing and pulling process, avoids the generation of deflection torque, and thus ensures that the light source and the camera always remain coaxial and aligned, thereby improving motion stability and measurement accuracy.

[0025] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, symmetrically distributed circular holes are provided on the mounting plate on the same side as the drive mechanism 5, and guide rods 7 are assembled in the circular holes through linear bearings. One end of the guide rods 7 is connected to the corresponding side wall of the U-shaped frame 6.

[0026] With the above structure, the symmetrically distributed guide rods 7 are arranged in parallel with the drive mechanism 5, which can resist the radial sway or torsional deformation that may occur during the extension and retraction of the drive mechanism 5. This can enhance the straightness, stability and anti-interference ability of the horizontal movement of the U-shaped frame 6, thereby ensuring the absolute stability of the relative position of the light source assembly 8 and the camera assembly 9, and providing a guarantee for obtaining clear and stable images and achieving repeatable measurements.

[0027] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the light source assembly 8 is a telecentric parallel light source. The light-emitting surface of the light source assembly 8 is set parallel to the lens end face of the camera assembly 9, and the central axes of the two are collinear.

[0028] Using a telecentric parallel light source, it can emit near-ideal high-quality parallel light, which can greatly eliminate light diffraction and make the edge of the measured blade disk have extremely high contour contrast and sharpness when imaged in the camera, laying a solid foundation for subsequent image processing algorithms to perform sub-pixel level edge localization.

[0029] Strict requirements ensure that the light-emitting surface of the light source is parallel to the end face of the camera lens and that the central axis is collinear. This ensures the symmetry and consistency of the optical path throughout the measurement area, avoids imaging distortion caused by non-orthogonal optical paths, guarantees the uniformity of the measurement benchmark, and thus eliminates systematic errors.

[0030] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, camera assembly 9 is an industrial area scan camera with a resolution of 5 megapixels or higher, and its telecentric lens has a magnification of 0.5X and a depth of field of not less than 5mm. The filter is a narrow bandpass filter with a center wavelength consistent with the emission wavelength of the light source assembly 8, for example, a filter with a center wavelength of 625nm±5nm is used to match the red LED parallel light source.

[0031] The industrial area array camera, combined with a telecentric lens configuration, can eliminate perspective errors caused by the different depths of field between the blade tip and the disk body of the measured object, ensuring a constant imaging magnification. This allows the measured pixel distance to truly reflect the actual physical size, achieving accurate measurement of absolute dimensions.

[0032] Adding a detachable filter, such as a narrow-bandpass filter, to the light-inlet end of a telecentric lens can selectively filter out ambient stray light, allowing only light of a specific wavelength from the light source to pass through. This improves the signal-to-noise ratio of the image, makes the edge features of the target more prominent, and enhances the stability of the measurement and its adaptability to complex workshop environments.

[0033] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the rotary platform 2 is a positioning platform that can rotate around a vertical axis, and its top is provided with a positioning structure that is compatible with the tenon of the overall blade disk.

[0034] Through the above structure, the high-precision rotary platform 2 can achieve precise indexing rotation of the entire bladed disk, so that each blade can be sent to the measurement station sequentially and automatically.

[0035] By setting up a dedicated positioning structure that matches the tenon of the overall blade disk, the blade disk can be precisely positioned and clamped, ensuring the uniformity of the measurement reference for the clamped blades.

[0036] The specific operating procedure of this utility model is as follows: During initial installation or periodic maintenance, camera calibration must be performed using standard gauge blocks or high-precision standard parts. Specifically: place the standard parts on the rotary platform 2, adjust the camera assembly 9 to the optimal working distance via the drive mechanism 5, and the camera assembly 9 acquires standard-scale images. Using image processing software based on OpenCV or Halcon, calculate the actual physical size corresponding to each pixel, i.e., the pixel equivalent, in mm / pixel, and preset this parameter in the measurement system.

[0037] During measurement preparation and system initialization, the operator aligns the entire impeller with the dedicated positioning structure on top of the rotary platform 2 via the tenon at its bottom, completing the impeller clamping and ensuring that the rotation axis of the impeller coincides with the axis of the rotary platform 2. Subsequently, the height of the sliding mechanism 4 is manually adjusted according to the impeller specifications, aligning the light paths of the light source assembly 8 and camera assembly 9 with the center of the impeller height. After starting the system, the drive mechanism 5 pushes the U-shaped frame 6 horizontally, adjusting it to the optimal working distance of the impeller.

[0038] The rotary platform 2, which serves as a reference marker, drives the impeller to rotate in an indexing manner, sequentially positioning each blade to a preset measurement position. At room temperature, the camera assembly 9 first acquires a clear image of the tip of each blade. The system automatically identifies and accurately records the initial outline of each blade in its cold state and the pixel-level position of the highest point of the blade tip using image processing algorithms, storing this data as a "reference marker" for calculating thermal elongation.

[0039] The integrated or external thermal simulation unit, such as the infrared heater or hot air circulation system located within the rotating platform 2, is activated to controllably and uniformly heat the entire bladed disk. The heating temperature can be set according to the actual operating conditions of the engine and is monitored in real time by a temperature sensor. After the bladed disk is heated to the target temperature and stabilizes, the optical measurement system repeatedly acquires images of the same blade in the hot state based on previously stored "reference marks." The system uses the same sub-pixel edge localization algorithm to accurately extract the position of the highest point of the blade tip in the hot state.

[0040] The data analysis and report generation measurement system compares the tip position of each blade under hot conditions with the previously stored "reference mark" position, calculates the pixel coordinate difference between the two, and then directly calculates the actual elongation of each blade due to heat based on the calibrated pixel equivalent. The system simultaneously records the correspondence between temperature and deformation. After all measurements are completed, an inspection report is automatically generated, clearly listing the elongation of each blade under hot conditions, providing data support for analyzing the thermal deformation patterns and consistency of the blades.

[0041] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A device for measuring the elongation of blades in an integral bladed disk, comprising a base plate (1), characterized in that: A rotating platform (2) and a mounting frame (3) are installed sequentially from left to right on the top of the base plate (1). A sliding mechanism (4) is slidably mounted on the mounting frame (3). A drive mechanism (5) is installed through one side of the sliding mechanism (4). A U-shaped frame (6) is installed at the telescopic end of the drive mechanism (5). A light source assembly (8) and a camera assembly (9) are respectively mounted at the front and rear ends of the U-shaped frame (6).

2. The device for measuring the elongation of an integral bladed disk according to claim 1, characterized in that: The sliding mechanism (4) includes a mounting plate and a sliding plate. The sliding plate is fixed to the bottom of the mounting plate. The top of the mounting frame (3) is provided with a sliding groove that matches the sliding plate. The sliding plate is slidably assembled in the sliding groove. The sliding plate has multiple evenly distributed first holes horizontally near the bottom. The upper part of the mounting frame (3) has multiple rows of second holes that match the first holes vertically corresponding to the position of the sliding groove. The sliding plate and the mounting frame (3) are detachably fixed by fasteners that pass through the first holes and the second holes. The first holes and the second holes are both threaded holes. The fasteners are bolts that match the threaded holes.

3. The device for measuring the elongation of an integral bladed disk according to claim 1, characterized in that: The drive mechanism (5) is a cylinder, an electric push rod or a hydraulic push rod. The fixed end of the drive mechanism (5) is fixedly connected to the mounting plate, and the telescopic end extends horizontally and is connected to the center of the U-shaped frame (6).

4. The device for measuring the elongation of an integral bladed disk according to claim 2, characterized in that: On the mounting plate, at the same side as the drive mechanism (5), symmetrically distributed guide rods (7) are slidably mounted, and one end of the guide rods (7) is connected to the corresponding side wall of the U-shaped frame (6).

5. The device for measuring the elongation of an integral bladed disk according to claim 1, characterized in that: The light source assembly (8) is a telecentric parallel light source. The light-emitting surface of the light source assembly (8) is set parallel to the lens end face of the camera assembly (9), and their central axes are collinear.

6. The device for measuring the elongation of an integral bladed disk according to claim 1, characterized in that: The camera assembly (9) is an industrial area array camera. The camera assembly (9) includes a telecentric lens and a filter. The filter is detachably mounted on the light-incident end of the telecentric lens.

7. The device for measuring the elongation of an integral bladed disk according to claim 1, characterized in that: The rotary platform (2) is a positioning platform that can rotate around a vertical axis, and its top is provided with a positioning structure that is compatible with the tenon of the overall blade disk.

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