A tool for fan rotor blade tip end face contouring

Abstract

A kind of measuring tool for fan rotor blade tip end face profile, including bottom plate, vertical support block is provided with in the top surface of bottom plate one end, the other end is provided with arc block;Vertical support block is provided with mounting bracket for clamping tenon of blade to be measured on it, after clamping, make the vertical state of corresponding engine axis of blade to be measured;The end face of arc block away from support block is set as arc surface;One end of arc block is provided with opposite table column, and one side of opposite table column is set as opposite table arc surface;The axis of arc surface, opposite table arc surface and the arc surface of the theoretical profile of blade tip of blade to be measured coincide with engine axis;Slidingly configured with slider on the arc surface of arc block, the top of slider is provided with table frame;Dial gauge is provided on the top of table frame, and the dial of dial gauge is towards the blade tip of blade to be measured.Slider slides on the arc surface of arc block, so by reading the indicated number of dial gauge, the processing size of blade tip full arc surface can be obtained.

Description

Technical Field

[0001] This invention relates to the field of aero-engine blade measuring devices, and more particularly to a measuring tool for the profile of the tip face of a fan rotor blade. Background Technology

[0002] The fan rotor blades are key components of the intake casing of an aero-turbofan engine. The blades have a large size and aspect ratio. Their main function is to compress the flowing air and improve intake efficiency, thereby increasing the core engine's operating efficiency and creating conditions for subsequent combustion gases to increase engine thrust.

[0003] The clearance between the fan rotor blades and the casing inner wall directly affects the engine's intake efficiency: a smaller clearance results in a higher compression ratio and higher efficiency; an excessively large clearance leads to air leakage, causing a significant decrease in the engine's intake efficiency and compression ratio, which in turn leads to a significant decrease in output thrust. Simultaneously, an excessively small clearance can cause frictional interference between the blade tips and the casing inner wall during high-speed engine rotation, potentially damaging the casing. Therefore, the radius of curvature of the fan rotor blade tips is crucial. Thus, it is necessary to inspect the radius of curvature of the blade tip surfaces.

[0004] like Figure 1 The diagram shows the existing testing method. A fixture 1 is fixedly installed on the platform of the external cylindrical grinding machine, and the blades 2 of the entire engine are clamped on the fixture 1. At the same time, a reference dial indicator block 3 is installed inside the machine tool. After the dial indicator needle 4 is aligned with the machine tool reference dial indicator block 3, the fixture 1 is rotated to drive the blades 2 to rotate, and the reading of the dial indicator 4 is read to obtain the dimensions of several points on the blade tip surface.

[0005] However, the above measurement method can only ensure that the dimensions of the measured points meet the design requirements. Other positions can only be guaranteed through processing methods. It is impossible to measure other positions, which may lead to the risk of dimensions not meeting the requirements. Summary of the Invention

[0006] The main objective of this invention is to provide a measuring tool for the profile of the tip surface of a fan rotor blade, thereby addressing the aforementioned technical problems.

[0007] To achieve the above objectives, this invention proposes a measuring tool for measuring the tip profile of a fan rotor blade, comprising a base plate, a vertical support block at one end of the top surface of the base plate, and an arc-shaped block at the other end; a mounting bracket is provided on the support block for clamping a tenon for the blade to be measured, so that the engine axis corresponding to the blade to be measured is perpendicular after clamping; the end face of the arc-shaped block away from the support block is configured as an arc surface; a dial indicator post is provided at one end of the arc block, and a dial indicator arc surface is provided on one side of the dial indicator post; the axes of the arc surface, the dial indicator arc surface, and the arc surface containing the theoretical tip profile of the blade to be measured all coincide with the engine axis; a slider is slidably disposed on the arc surface, and a dial indicator frame is provided on the top of the slider; a dial indicator is provided on the top of the dial indicator frame, with the dial indicator needle pointing towards the tip of the blade to be measured.

[0008] Preferably, a groove is provided on the arc-shaped surface, the direction of which is consistent with the tip direction of the blade to be tested; a pin is inserted into the slider and the pin is inserted into the groove, and the pin and the groove slide together.

[0009] Furthermore, the arc-shaped surface is coplanar with the arc surface containing the theoretical profile of the blade tip of the blade under test.

[0010] Optionally, the lower end face of the slider always abuts against the base plate and slides on the top surface of the base plate, and the frame is a telescopic sleeve structure.

[0011] Furthermore, the dial indicator frame includes an upper tube and a lower tube; the lower tube is a hollow structure, and the upper tube is slidably installed inside the lower tube; the dial indicator is installed on the top of the upper tube, the lower end of the lower tube is fixed to the top surface of the slider, and a spring is provided inside the lower tube; the spring is in a compressed state, with its upper end abutting against the lower end surface of the upper tube and its lower end abutting against the top surface of the slider.

[0012] Furthermore, the mounting bracket includes a support fixed to the support block, clamps disposed on both sides of the support, and a locking screw; a positioning pin is provided on the end face of the support for supporting the tenon end face of the blade to be tested; the locking screw is disposed through the clamps and the support.

[0013] Furthermore, a stepped surface is provided on the opposing surfaces of the two clamping plates, and the sidewall of the stepped surface forms a positioning surface.

[0014] Furthermore, an annular boss is integrally formed on the end face of the support near the support block, and the annular boss is connected to the support block by bolts.

[0015] Preferably, the surface of the counter-surface is located on the extension surface of the arc surface where the theoretical profile of the blade tip of the blade to be tested is located.

[0016] Preferably, the surface of the slider that contacts the arc-shaped surface is set as an arc surface, and the radius of the arc surface is the same as the radius of the arc-shaped surface.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0018] (1) In this invention, since the axes of the arc surface on the arc block, the dial gauge arc surface on the dial gauge post, and the arc surface where the theoretical profile of the blade tip of the blade to be tested is located all coincide with the engine axis, after the dial gauge is aligned using the dial gauge post, when the slider slides on the arc surface of the arc block, the axis formed by the path of the dial gauge movement also coincides with the engine axis. Therefore, by reading the dial gauge reading, the machining dimensions of the full arc surface of the blade tip can be obtained.

[0019] (2) In one embodiment of the present invention, a groove is provided on the arc surface, and the direction of the groove is consistent with the direction of the blade tip of the blade to be measured. By using a pin inserted on the slider to slide in cooperation with the groove, when the slider slides on the arc surface of the arc block, it also moves along the direction of the groove, so that the slider forms a compound motion. This allows the dial indicator needle to always be in contact with the blade tip surface of the blade to be measured, which is convenient for detecting the entire blade tip arc surface and realizing full coverage measurement of the blade tip surface profile.

[0020] (3) In another embodiment of the present invention, the lower end face of the slider always abuts against the base plate and slides on the top surface of the base plate. The dial indicator frame is a telescopic sleeve structure formed by the upper tube and the lower tube. When in use, the operator can push the slider along the arc surface of the arc block with one hand and press the upper tube with the other hand to adjust the height position of the dial indicator, so that the dial indicator needle is always in contact with the tip surface of the blade to be measured, so as to detect the entire tip arc surface and realize the full coverage measurement of the tip surface profile.

[0021] (4) In this invention, the sliding cooperation between the slider and the arc block is beneficial to reduce the size of the entire measuring tool and make it convenient to use.

[0022] (5) The measuring instrument provided by this invention overcomes the problem of existing measurement methods requiring in-machine shutdown and thus occupying equipment time. This measuring instrument performs external measurements, improving equipment utilization. Furthermore, using this measuring instrument allows for single-piece measurement, reducing measurement waiting time. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of existing detection methods;

[0025] Figure 2 This is the front view of the blade to be tested;

[0026] Figure 3 This is the right view of the blade to be tested;

[0027] Figure 4 This is a schematic diagram of the first embodiment of the measuring instrument provided by the present invention;

[0028] Figure 5 for Figure 4 Sectional view at point BB;

[0029] Figure 6 An enlarged view of the first embodiment of the measuring instrument provided by the present invention;

[0030] Figure 7 An enlarged view of the second embodiment of the measuring instrument provided by the present invention.

[0031] Explanation of reference numerals: 1. Fixture; 2. Blade; 3. Alignment block; 4. Dial needle; 5. Base plate; 6. Support block; 7. Blade to be measured; 8. Arc block; 8a. Arc surface; 8b. Slide groove; 9. Slider; 9a. Pin; 10. Alignment post; 11. Dial indicator holder; 12. Dial indicator; 13. Support; 13a. Annular boss; 14. Clamping plate; 14a. Stepped surface; 15. Locating pin. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0034] Figure 1 The image shows the existing detection methods. Figure 2 , Figure 3This is a schematic diagram of the blade under test. One end of the blade is a tenon, and the other end is the blade tip. The blade tip profile is an arc formed by the intersection of a cylindrical surface with the engine axis A as the axis and the blade body. In the diagram, X, Y, and Z are the coordinate system used in blade modeling, and φXXX represents the diameter of the cylindrical surface containing the blade tip profile. Figure 3 As shown, when the engine axis A is in a vertical state, the blade tip surface is tilted in the view along the direction of the blade tip surface, and its direction is tilted from the upper left corner to the lower right corner.

[0035] Example 1:

[0036] Combination Figures 4 to 6 The diagram shows a first embodiment of a measuring tool for measuring the tip profile of a fan rotor blade provided by the present invention. The measuring tool includes a base plate 5, with a vertical support block 6 at one end of the top surface of the base plate 5 and an arc-shaped block 8 at the other end. A mounting bracket is provided on the support block 6 for clamping a tenon for the blade 7 to be measured, ensuring that the engine axis corresponding to the blade 7 is perpendicular after clamping. The end face of the arc-shaped block 8 away from the support block 6 is configured as an arc-shaped surface 8a. A dial indicator post 10 is provided at one end of the arc-shaped block 8, and a dial indicator arc surface 10a is provided on one side of the dial indicator post 10. The axes of the arc-shaped surface 8a, the dial indicator arc surface 10a, and the arc surface containing the theoretical tip profile of the blade 7 to be measured all coincide with the engine axis. A slider 9 is slidably disposed on the arc-shaped surface 8a, and a dial indicator frame 11 is provided on the top of the slider 9. A dial indicator 12 is provided on the top of the dial indicator frame 11, with the pointer of the dial indicator 12 pointing towards the tip of the blade 7 to be measured.

[0037] During the inspection, the blade 7 to be inspected is mounted on the mounting bracket of the support block 6, with the corresponding engine axis A in a vertical state. After the dial indicator 12 is aligned with the gauge post 10, the slider 9 slides on the arc surface 8a of the arc block 8, causing the dial indicator 12 at the top of the gauge holder 11 to move. The gauge post of the dial indicator 12 is used to inspect the tip arc surface of the blade 7 to be inspected.

[0038] Combination Figure 4 and Figure 6 As shown, in this embodiment, a groove 8b is provided on the arc-shaped surface 8a, and the direction of the groove 8b is consistent with the direction of the blade tip of the blade 7 to be tested; a pin 9a is inserted into the slider 9, and the pin 9a is inserted into the groove 8b, with the pin 9a slidingly engaging with the groove 8b. Figure 3As shown, the tip of the blade is inclined, with its direction sloping from the upper left to the lower right. To ensure that the pointer of the dial indicator 12 remains in contact with the tip of the blade during testing, a groove 8b with the direction of the blade tip is provided. When the slider 9 slides on the arc surface 8a of the arc block 8, it also moves along the direction of the groove 8b, resulting in a compound motion of the slider 9. This compound motion ensures that the pointer of the dial indicator 12 remains in contact with the tip of the blade 7, facilitating the testing of the entire blade tip arc surface and achieving full coverage measurement of the blade tip profile.

[0039] In this embodiment, in order to make the groove 8b consistent with the tip of the blade 7 to be tested, the arc surface 8a and the arc surface where the theoretical profile of the tip of the blade 7 to be tested is located are set to be coplanar, that is, the diameter of the arc surface 8a is the same as the diameter of the arc surface where the theoretical profile of the tip of the blade 7 to be tested is located.

[0040] Combination Figure 4 As shown, in this embodiment, the mounting frame includes a support 13 fixed to the support block 6, clamping plates 14 disposed on both sides of the support 13, and a locking screw 16; a positioning pin 15 is provided on the end face of the support 13 to support the tenon end face of the blade 7 to be tested; the locking screw 16 is disposed through the clamping plate 14 and the support 13. When clamping the blade 7 to be tested, the tenon of the blade 7 to be tested is placed between the two clamping plates 14, and the lower end face of the tenon abuts against the positioning pin 15. The clamping plates 14 are closed and the blade 7 to be tested is pressed by the locking screw 16, thus completing the clamping of the blade 7 to be tested.

[0041] Furthermore, combined Figure 5 As shown, in this embodiment, a stepped surface 14a is provided on the opposing surfaces of the two clamping plates 14, and the sidewall of the stepped surface 14a forms a positioning surface 14b. During clamping, the tenon of the blade 7 to be tested is engaged on the stepped surface 14a, and the positioning surface 14b forms a radial positioning. With the cooperation of the positioning pin 15, the blade 7 to be tested can be positioned. This structure is simple to position and convenient to clamp.

[0042] Combination Figure 4 As shown, in order to facilitate the installation of the support 13, an annular boss 13a is integrally formed on the end face of the support 13 near the support block 6, and the annular boss 13a is connected to the support block 6 by bolts.

[0043] In this embodiment, to facilitate the machining of the surface arc surface 10a on the counterpost 10, the surface arc surface 10a is located on the extended surface of the arc surface containing the theoretical profile of the blade tip of the blade 7 to be tested. That is, the diameters of the arc surface 8a, the surface arc surface 10a, and the arc surface containing the theoretical profile of the blade tip of the blade 7 to be tested are all the same. When machining the surface arc surface 10a and the arc surface 8a, the arc block 8 and the counterpost 10 can be first mounted on the base plate, and the surface arc surface 10a and the arc surface 8a can be machined simultaneously by turning, and then polished.

[0044] In this embodiment, in order to ensure that the slider 9 slides smoothly on the arc surface 8a, the surface of the slider 9 that contacts the arc surface 8a is set as an arc surface, and the radius of the arc surface is the same as the radius of the arc surface 8a.

[0045] Example 2:

[0046] Combination Figure 7 As shown, based on Embodiment 1, the difference in Embodiment 2 is that the groove 8b on the arc-shaped surface 8a is removed, and the pin 9a inserted into the slider 9 is also removed. The lower end face of the slider 9 is always against the base plate 5 and slides on the top surface of the base plate 5, and the gauge holder 11 is configured as a telescopic sleeve structure. Specifically, the gauge holder 11 includes an upper tube 11a and a lower tube 11b; the lower tube 11b is a hollow structure, and the upper tube 11a is slidably installed inside the lower tube 11b; the dial indicator 12 is installed on the top of the upper tube 11a, the lower end of the lower tube 11b is fixed to the top surface of the slider 9, and a spring 11c is provided inside the lower tube 11b; the spring 11c is in a compressed state, with its upper end against the lower end face of the upper tube 11a and its lower end against the top surface of the slider 9.

[0047] When in use, the operator can push the slider 9 on the top surface of the base 5 with one hand and move it along the arc surface 8a of the arc block 8 at the same time. With the other hand, the operator can press the upper tube 11a and adjust the height position of the dial indicator 12 so that the needle of the dial indicator 12 is always in contact with the tip surface of the blade 7 to be measured, so as to detect the entire tip arc surface and achieve full coverage measurement of the blade tip surface profile.

[0048] Except for the structure described above, the structure of this second embodiment is the same as that of the first embodiment, and will not be repeated here.

[0049] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A measuring tool for the profile of the tip face of a fan rotor blade, characterized in that, Includes a base plate (5), with a vertical support block (6) at one end of the top surface of the base plate (5) and an arc-shaped block (8) at the other end; A mounting bracket is provided on the support block (6) for clamping the tenon of the blade (7) to be tested. After clamping, the engine axis corresponding to the blade (7) to be tested is in a vertical state. The end face of the arc block (8) away from the support block (6) is set as an arc surface (8a); a watch post (10) is provided at one end of the arc block (8), and a watch arc surface (10a) is set on one side of the watch post (10). The axes of the arc surface (8a), the surface arc surface (10a), and the arc surface containing the theoretical profile of the blade tip of the blade to be tested (7) all coincide with the engine axis. A slider (9) is slidably disposed on the arc-shaped surface (8a), and a dial indicator (11) is provided on the top of the slider (9); a dial indicator (12) is provided on the top of the dial indicator (11), and the pointer of the dial indicator (12) is directed toward the tip of the blade (7) to be measured; A groove (8b) is provided on the arc-shaped surface (8a), and the direction of the groove (8b) is consistent with the direction of the blade tip of the blade (7) to be tested; A pin (9a) is inserted into the slider (9), and the pin (9a) is inserted into the slide groove (8b), and the pin (9a) and the slide groove (8b) are in sliding engagement; The arc-shaped surface (8a) is coplanar with the arc surface containing the theoretical profile of the blade tip of the blade to be tested (7); The lower end face of the slider (9) always abuts against the base plate (5) and slides on the top surface of the base plate (5). The table frame (11) is a telescopic sleeve structure. The frame (11) includes an upper tube (11a) and a lower tube (11b). The lower tube (11b) is a hollow structure, and the upper tube (11a) is slidably installed inside the lower tube (11b); the dial indicator (12) is installed on the top of the upper tube (11a), the lower end of the lower tube (11b) is fixed to the top surface of the slider (9), and a spring (11c) is provided inside the lower tube (11b). The spring (11c) is in a compressed state, with its upper end abutting against the lower end face of the upper tube (11a) and its lower end abutting against the top surface of the slider (9).

2. The measuring tool for the profile of the tip surface of a fan rotor blade as described in claim 1, characterized in that, The mounting bracket includes a support (13) fixed to the support block (6), a clamp (14) set on both sides of the support (13), and a locking screw (16); a positioning pin (15) is provided on the end face of the support (13) to support the tenon end face of the blade (7) to be tested; the locking screw (16) is provided through the clamp (14) and the support (13).

3. A measuring tool for the profile of the tip surface of a fan rotor blade as described in claim 2, characterized in that, A stepped surface (14a) is provided on the opposite surfaces of the two clamping plates (14), and the sidewall of the stepped surface (14a) forms a positioning surface (14b).

4. A measuring tool for the profile of the tip surface of a fan rotor blade as described in claim 2, characterized in that, The support (13) has an annular boss (13a) integrally formed on the end face near the support block (6), and the annular boss (13a) is connected to the support block (6) by bolts.

5. A measuring tool for the profile of the tip surface of a fan rotor blade as described in claim 1, characterized in that, The surface of the counter-arc (10a) is located on the extended surface of the arc surface on which the theoretical profile of the blade tip of the blade to be tested (7) is located.

6. A measuring tool for the profile of the tip surface of a fan rotor blade as described in claim 1, characterized in that, The surface of the slider (9) that contacts the arc surface (8a) is set as an arc surface, and the radius of the arc surface is the same as the radius of the arc surface (8a).

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