Three-dimensional measuring device for surface roughness of aero-engine blade

Abstract

The utility model provides an aero-engine blade surface roughness three-dimensional measuring device. The aero-engine blade surface roughness three-dimensional measuring device comprises a base; the bracket is connected to the upper end part of the base; the rotary clamping assembly is installed on the base, located below the support and used for clamping a blade to be tested. The measuring assembly is installed on the support and extends downwards to the position over the rotary clamping assembly along the support. The rotating clamping assembly drives the blade to rotate, and the measuring assembly scans and collects the blade to obtain data of the surface appearance of the blade. The surface of the blade can be prevented from being scratched, and nondestructive measurement is achieved; the three-dimensional profile of the blade surface in the scanning range can be obtained, the measurement error caused by incorrect scanning direction is avoided, and the measurement precision is improved; accurate positioning of the specified position of the surface of the blade can be achieved, errors caused by incorrect measurement positions are avoided, and measurement repeatability, reproducibility and consistency are improved.

Description

Technical Field

[0001] The utility model relates to the field of three-dimensional shape measurement of the surface of an aero-engine blade, in particular to a three-dimensional measurement device for the surface roughness of an aero-engine blade. Background Art

[0002] In the field of three-dimensional topography measurement of aircraft engine blade surfaces, aircraft engine blades are the most important core components of the engine, with complex shapes, large bending and twisting, and complex processing technology. The surface processing quality of aircraft engine blades directly affects the working safety and efficiency of the engine, and to a large extent determines the performance of the engine.

[0003] The surface quality of a blade depends on its surface morphology, and roughness is an important indicator parameter of surface morphology, which is used to characterize the microscopic geometric error of the surface. Good blade surface roughness can make the stress distribution on the blade surface more uniform, reduce stress concentration and the appearance of microcracks, thereby effectively improving the fatigue life of the blade, and can also make the blade surface smoother, which is conducive to reducing the wind resistance on the blade surface, and is of great benefit to improving the aerodynamic performance and work efficiency of the blade.

[0004] Therefore, it is necessary to detect and control the surface roughness of aircraft engine blades. However, the requirements for blade surface processing quality are very high. For example, the Ra value of the surface of a typical compressor blade is required to be no higher than 0.4μm, so the requirements for measurement methods and measurement means are very high.

[0005] At present, the commonly used surface roughness measurement method is mainly two-dimensional contact measurement. Generally, a stylus-type profile measuring instrument is used. This method is easily limited by the arc radius of the stylus, and it is difficult to measure the actual valley bottom of the measured profile, which affects the measurement accuracy. This method can only perform line measurement in a certain direction, and it is difficult to obtain comprehensive information on the surface morphology. The measurement and evaluation have limitations. In addition, due to the influence of the contact measurement force, the stylus is easy to scratch the measured surface.

[0006] With the continuous improvement of the requirements for roughness measurement, some advanced measurement technologies are gradually applied to the field of surface roughness measurement. White light interferometry is an ultra-high precision microscopic measurement technology that acquires surface information by collecting interference fringe images formed by the reflected light of the measured surface. It has a high tolerance for the reflectivity of the measured surface, a vertical resolution of up to 0.1nm, simple calculation, and is characterized by non-destructive measurement, high precision, and high efficiency.

[0007] The surface roughness of blades needs to be measured before they are put into use. Currently, two-dimensional contact measurement is used. In addition to the disadvantages of the above-mentioned measurement method, this measurement method has the following shortcomings for irregular free-form surface parts such as blades:

[0008] 1. It is difficult to confirm the surface texture of the blade, and it is easy to have scanning direction deviation, resulting in measurement errors.

[0009] Second, it is impossible to accurately position the device, which may easily lead to measurement errors due to deviations in the measurement position and poor reproducibility.

[0010] In view of this, the inventor of the present application has designed a three-dimensional measurement device for the surface roughness of aircraft engine blades in order to overcome the above-mentioned technical problems. Utility Model Content

[0011] The technical problem to be solved by the utility model is to overcome the defects of the two-dimensional contact measurement method in the prior art that the scanning direction deviation is easy to occur, resulting in measurement errors and poor reproducibility, and to provide a three-dimensional measurement device for the surface roughness of aircraft engine blades.

[0012] The utility model solves the above technical problems through the following technical solutions:

[0013] A three-dimensional measuring device for the surface roughness of an aircraft engine blade, characterized in that the three-dimensional measuring device comprises:

[0014] Base;

[0015] A bracket connected to an upper end of the base;

[0016] A rotating clamping assembly, which is mounted on the base and located below the bracket and is used to clamp the blade to be tested;

[0017] A measuring assembly, the measuring assembly being mounted on the bracket and extending downward along the bracket to just above the rotating clamping assembly;

[0018] The rotating clamping assembly drives the blade to rotate, and the measuring assembly scans and collects data on the blade to obtain data on the surface morphology of the blade.

[0019] According to one embodiment of the utility model, the rotating clamping assembly includes a bidirectional slide and a dual-axis turntable. The bidirectional slide is installed on the base and slides along the left and right directions and the front and back directions of the base. The dual-axis turntable is installed on the bidirectional slide.

[0020] According to an embodiment of the present utility model, the rotating clamping assembly further includes a clamp, and the clamp is installed on the dual-axis turntable and is used to drive the clamp to rotate in two directions.

[0021] According to an embodiment of the utility model, the measuring assembly includes a measuring head, a telescopic arm and an interference objective lens, the measuring head is mounted on the bracket, the telescopic arm is connected to the bottom of the measuring head and can be telescoped in the up and down directions;

[0022] The interference objective lens is installed at the bottom of the telescopic arm and is used to drive the interference objective lens to move linearly.

[0023] According to an embodiment of the utility model, the dual-axis turntable has two rotation axes, the plane where the two rotation axes are located is the XOY plane, and the intersection of the two rotation axes is the coordinate origin.

[0024] According to an embodiment of the utility model, the light source axis of the interference objective lens is the Z axis, and the coordinate system of the three-dimensional measurement device is constructed.

[0025] According to an embodiment of the present invention, the bracket is a hollow frame structure, the bottom of the frame structure is connected to two sides of the base, and is erected above the base.

[0026] According to one embodiment of the utility model, the dual-axis turntable includes a turntable base and a mounting plate, the turntable base is installed on the bidirectional slide, the two ends of the mounting plate are respectively connected to the inner wall surfaces on both sides of the turntable base, connected inside the turntable base, and the clamp is installed on the mounting plate.

[0027] According to an embodiment of the present invention, the mounting plate is located in a horizontal position.

[0028] According to an embodiment of the present utility model, the clamp comprises two clamping parts, and the clamping parts clamp the blade to be measured from left and right sides.

[0029] The positive and progressive effects of the utility model are:

[0030] The three-dimensional measuring device for the surface roughness of aero-engine blades of the utility model has the following advantages:

[0031] 1. It can avoid scratches on the blade surface and achieve non-destructive measurement;

[0032] Second, the three-dimensional profile of the blade surface within the scanning range can be obtained, avoiding the measurement error caused by incorrect scanning direction and improving the measurement accuracy;

[0033] 3. It can realize accurate positioning of the specified position on the blade surface, avoid errors caused by incorrect measurement position, and improve measurement repeatability, reproducibility and consistency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0035] Figure 1It is a stereoscopic diagram of the three-dimensional measuring device for the surface roughness of an aero-engine blade according to the utility model.

[0036] Figure 2 The utility model is a schematic diagram of the measuring state of the three-dimensional measuring device for the surface roughness of an aero-engine blade.

[0037] [Reference Signs]

[0038] Base 10

[0039] Bracket 20

[0040] Blade 30

[0041] Double-way slide 40

[0042] Dual axis turntable 50

[0043] Fixture 60

[0044] Turntable base 51

[0045] Mounting plate 52

[0046] Measuring head 70

[0047] Telescopic arm 71

[0048] Interference objective 72 DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0050] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.Preferred embodiments of the present invention will now be described in detail, examples of which are shown in the accompanying drawings.Where possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0051] In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article.

[0052] Furthermore, it is required that the present invention be understood not only by the actual terms used but also by the meanings contained in each term.

[0053] like Figure 1 and Figure 2As shown, the utility model discloses a three-dimensional measuring device for the surface roughness of an aircraft engine blade, which comprises: a base 10, a bracket 20, a rotating clamping assembly and a measuring assembly. Among them, the bracket 20 is connected to the upper end of the base 10. The rotating clamping assembly is installed on the base 10, located below the bracket 20, and is used to clamp the blade 30 to be measured. The measuring assembly is installed on the bracket 20, and extends downward along the bracket 20 to just above the rotating clamping assembly. The rotating clamping assembly drives the blade 30 to rotate, and the measuring assembly scans and collects the blade 30 to obtain data on the surface morphology of the blade 30.

[0054] Preferably, the rotating clamping assembly includes a bidirectional slide 40 and a biaxial turntable 50 . The bidirectional slide 40 is installed on the base 10 and slides along the left-right direction and the front-back direction of the base 10 . The biaxial turntable 50 is installed on the bidirectional slide 40 .

[0055] Preferably, the rotating clamp assembly further comprises a clamp 60, which is mounted on the dual-axis turntable 50 to drive the clamp 60 to rotate in two directions. The clamp 60 can clamp the tenon portion of the blade 30 and drive the blade 30 to move together.

[0056] More preferably, the dual-axis turntable 50 includes a turntable base 51 and a mounting plate 52, the turntable base 51 is mounted on the bidirectional slide 40, the two ends of the mounting plate 52 are respectively connected to the inner wall surfaces on both sides of the turntable base 51, connected inside the turntable base 51, and the fixture 60 is mounted on the mounting plate 52. The mounting plate 52 here is preferably arranged to be located in a horizontal position.

[0057] The clamp 60 here includes two clamping parts, and the clamping parts clamp the blade 30 to be measured from the left and right sides.

[0058] Further preferably, the measuring assembly includes a measuring head 70, a telescopic arm 71 and an interference objective lens 72, the measuring head 70 is mounted on the bracket 20, the telescopic arm 71 is connected to the bottom of the measuring head 70, and can be extended and retracted in the up and down direction. The interference objective lens 72 is mounted at the bottom of the telescopic arm 71, and is used to drive the interference objective lens 72 to move linearly.

[0059] In particular, in this embodiment, the dual-axis turntable 50 has two rotation axes, the plane where the two rotation axes are located is the XOY plane, and the intersection of the two rotation axes is the coordinate origin. The light source axis of the interference objective 72 is the Z axis, and the coordinate system of the three-dimensional measurement device is constructed.

[0060] In addition, in this embodiment, the bracket 20 is a hollow frame structure, the bottom of which is connected to both sides of the base 10 and is erected above the base 10 .

[0061] According to the above structural description, the specific process of the three-dimensional measuring device for the surface roughness of the aero-engine blade of the utility model for detecting the surface roughness of the blade is as follows:

[0062] The plane where the axes of the two rotating axes of the dual-axis turntable 50 are located is the XOY plane, the intersection of the two rotating axes is the coordinate origin, and the light source axis of the interference objective lens 72 is the Z axis to construct the device coordinate system. The three-dimensional model of the blade 30 is imported into the device coordinate system, and the software establishes a mapping relationship between the coordinate system of the three-dimensional model of the blade 30 and the device coordinate system, calculates the five-axis offset motion parameters corresponding to the measured point P in the device coordinate system, and saves them under the measured point P.

[0063] Then, according to the calculated five-axis offset motion parameters, the dual-axis turntable 50 drives the fixture 60 to rotate and then drives the blade 30 to rotate, the bidirectional slide 40 moves linearly, and the telescopic arm 71 drives the interference objective lens 72 to move linearly, so that the point P to be measured on the three-dimensional model of the blade 30 is located at the specified position, and the normal vector is parallel to the Z axis.

[0064] By extending and retracting the telescopic arm 71 , the interference objective lens 72 is driven to scan and collect data, thereby acquiring the surface morphology of the point to be measured P and obtaining relevant data for surface roughness evaluation.

[0065] The utility model discloses a three-dimensional measuring device for the surface roughness of an aero-engine blade. Aiming at the problems of incorrect scanning direction and incomplete information that are easy to occur in two-dimensional contact measurement, the utility model adopts the basic principle of white light interference and combines a precision scanning mechanism to perform non-contact scanning on the blade surface, obtain three-dimensional data of the blade surface, and improve measurement accuracy.

[0066] In order to solve the problem that two-dimensional contact measurement cannot accurately locate the object, the three-dimensional measuring device adopts a five-axis fully automatic positioning solution based on a blade fixture to automatically acquire and automatically displace the five-axis offset parameters, thereby accurately positioning the specified measurement position of the blade and improving the repeatability, reproducibility and consistency of the measurement results.

[0067] In summary, the three-dimensional measurement device for the surface roughness of aero-engine blades of the utility model has the following advantages:

[0068] 1. It can avoid scratches on the blade surface and achieve non-destructive measurement;

[0069] Second, the three-dimensional profile of the blade surface within the scanning range can be obtained, avoiding the measurement error caused by incorrect scanning direction and improving the measurement accuracy;

[0070] 3. It can realize accurate positioning of the specified position on the blade surface, avoid errors caused by incorrect measurement position, and improve measurement repeatability, reproducibility and consistency.

[0071] For those skilled in the art, the above invention disclosure is only used as an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary implementation of the present application.

[0072] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0073] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus facilitate the understanding of one or more embodiments of the invention, in the foregoing description of the embodiments of this application, multiple features are sometimes grouped into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the subject matter of this application requires more features than those mentioned in the claims. In fact, the features of an embodiment are less than all the features of a single embodiment disclosed above.

[0074] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. A three-dimensional measurement device for the surface roughness of an aircraft engine blade, characterized in that: The three-dimensional measuring device comprises: Base; A bracket connected to an upper end of the base; A rotating clamping assembly, which is mounted on the base and located below the bracket and is used to clamp the blade to be tested; A measuring assembly, the measuring assembly being mounted on the bracket and extending downward along the bracket to just above the rotating clamping assembly; The rotating clamping assembly drives the blade to rotate, and the measuring assembly scans and collects data on the blade to obtain data on the surface morphology of the blade.

2. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 1, characterized in that: The rotating clamping assembly includes a bidirectional slide and a biaxial turntable. The bidirectional slide is installed on the base and slides along the left-right direction and the front-back direction of the base. The biaxial turntable is installed on the bidirectional slide.

3. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 2, characterized in that: The rotating clamping assembly also includes a clamp, which is installed on the dual-axis turntable and is used to drive the clamp to rotate in two directions.

4. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 2, characterized in that: The measuring assembly comprises a measuring head, a telescopic arm and an interferometric objective lens, wherein the measuring head is mounted on the bracket, and the telescopic arm is connected to the bottom of the measuring head and can be telescoped in the up and down directions; The interference objective lens is installed at the bottom of the telescopic arm and is used to drive the interference objective lens to move linearly.

5. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 4, characterized in that: The dual-axis turntable has two rotation axes, the plane where the two rotation axes are located is the XOY plane, and the intersection of the two rotation axes is the coordinate origin.

6. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 5, characterized in that: The light source axis of the interference objective lens is the Z axis, which constructs the coordinate system of the three-dimensional measuring device.

7. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 1, characterized in that: The bracket is a hollow frame structure, the bottom of which is connected to both sides of the base and is erected above the base.

8. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 3, characterized in that: The dual-axis turntable includes a turntable base and a mounting plate. The turntable base is mounted on the bidirectional slide. The two ends of the mounting plate are respectively connected to the inner wall surfaces on both sides of the turntable base and connected inside the turntable base. The fixture is mounted on the mounting plate.

9. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 8, characterized in that: The mounting plate is located in a horizontal position.

10. The three-dimensional measurement device for the surface roughness of an aircraft engine blade according to claim 8, characterized in that: The clamp comprises two clamping parts, and the clamping parts clamp the blade to be tested from left and right sides.

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