A fixture for aero-engine blade forging profile detection

Abstract

A kind of fixture for aero-engine blade forging profile detection, including base, support and support block are arranged on the top surface of the base;V-shaped block is mounted on the vertical arm of support by floating structure, for supporting the upper journal of blade forging;The V-shaped block can form floating support structure along Y direction;P point positioning pin and ball head support rod are provided on the support block, the end of the P point positioning pin is used to abut on the end face of tenon of blade forging;The ball head of the ball head support rod is used to support the lower end face of tenon of blade forging;Multiple positioning templates are provided on the top surface of the base;Pressing hook is provided on the base;The pressing hook is used to press on the blade basin of blade forging, and push the blade back of blade forging to abut on the positioning template.By using the fixture, blade forging positioning and installation are simple and fast.

Description

Technical Field

[0001] This invention relates to the field of aero-engine blade inspection technology, and in particular to a fixture for inspecting the surface profile of aero-engine blade forgings. Background Technology

[0002] Blade measuring tools are commonly used to measure the surface dimensions of aero-engine blade forgings. However, traditional tools can only measure blades after edge trimming. Therefore, in traditional processes, die adjustment in the final forging stage is generally based on the measurement data of blades without burrs after calibration. This increases the number of coupled influencing factors in the die adjustment process, making it more difficult and reducing production efficiency and increasing production losses to some extent. On the other hand, to shorten the blade forging production cycle, laser trimming technology is being gradually promoted in the aero-engine blade forging process. When using laser trimming technology, the surface dimensions of the blade forging must meet the requirements, thus requiring measurement of the final forging surface dimensions. When inspecting the blade forging surface, fixtures are needed to clamp the blade forging.

[0003] like Figure 1 The diagram shows a schematic of the blade forging to be inspected. The forging comprises a blade body, a tenon, and upper and lower journals at both ends. A burr ring is also formed around the entire blade. In the prior art, patent application CN112179238A discloses a device and method for measuring the end face position of a rectifier blade. However, the provided measuring device cannot accurately measure the... Figure 1 The blade forging shown is clamped. A template is then used to... Figure 1 When inspecting the blade forging shown, how to clamp the blade forging is an urgent problem to be solved. Summary of the Invention

[0004] The main objective of this invention is to provide a fixture for inspecting the surface profile of aero-engine blade forgings, thereby addressing the aforementioned technical problems.

[0005] To achieve the above objectives, this invention proposes a fixture for inspecting the profile of aero-engine blade forgings, comprising a base, a support and a block on the top surface of the base; a V-block is mounted on the vertical arm of the support via a floating structure to support the upper journal of the blade forging; the V-block can form a floating support structure along the Y direction; a P-point locating pin and a ball-end support rod are provided on the block, the end of the P-point locating pin abutting against the end face of the tenon of the blade forging; the ball end of the ball-end support rod supports the lower end face of the tenon of the blade forging; multiple positioning templates are provided on the top surface of the base; a pressure hook is provided on the base; the pressure hook is used to press against the blade head of the blade forging and push the blade back of the blade forging against the positioning templates.

[0006] Preferably, the floating structure between the support and the V-block includes a bushing, a floating rod, and a first spring; the bushing is embedded in the vertical arm of the support; the floating rod includes an integrally formed smooth rod portion and a threaded rod portion; the end of the smooth rod portion is fixedly connected to the V-block; the smooth rod portion is slidably fitted with the inner hole of the bushing; the first spring is sleeved on the smooth rod portion of the floating rod, with one end abutting against the V-block and the other end abutting against the vertical arm of the support; the threaded rod portion of the floating rod extends out of the bushing and is provided with a nut.

[0007] Preferably, a slot is provided at the lower part of the V-block; an anti-rotation pin is provided on the vertical arm of the support; the anti-rotation pin is inserted into the slot, and the inner wall of the slot on the outer periphery of the anti-rotation pin is in sliding fit.

[0008] Preferably, the number of positioning templates is two, which are spaced apart along the Z direction; the positioning templates include a first positioning template and a second positioning template; a first arc-shaped contact surface is provided on the first positioning template; and a second arc-shaped contact surface and a third arc-shaped contact surface are provided on the second positioning template.

[0009] Preferably, a groove is provided at the front and rear edges of the top of the base, and a square column is provided in the groove; the top surface and outer surface of the square column are set as detection reference surfaces; the top surface of the square column is higher than the top surface of the base; the outer surface of the square column is higher than the front and back of the base; and an open slot is provided at the root of the groove of the base.

[0010] Preferably, the base is a hollow structure with an open lower end; a hinge seat is provided on the inner wall of the base cavity; a first oblong hole is provided on the top surface of the base, extending into the inner cavity of the base; the lower end of the pressure hook passes through the first oblong hole and is connected to the hinge seat by a pin; a set screw is screwed on the front wall of the base, the inner end of which extends into the first oblong hole and abuts against the pressure hook, for pushing the pressure hook to rotate around the pin and press the blade forging.

[0011] Preferably, an adjusting screw is screwed onto the front wall of the base, the adjusting screw being located below the set screw, and a second spring is provided between the adjusting screw and the pressure hook, the second spring being always in a stretched state.

[0012] Preferably, a slider is integrally formed on the bottom of the first positioning template and the second positioning template respectively; a first sliding groove and a second sliding groove are provided on the top surface of the base; the first sliding groove and the second sliding groove are both parallel to the Y direction; a second oblong hole is provided at the bottom of the first sliding groove; a third oblong hole is provided at the bottom of the second sliding groove; the first positioning template is installed in the first sliding groove by the slider at its bottom, and a screw is provided in the second oblong hole for locking the first positioning template; the second positioning template is installed in the second sliding groove by the slider at its bottom, and a screw is provided in the third oblong hole for locking the second positioning template.

[0013] Preferably, a clamping plate is provided on the top surface of the two square columns, a measuring pin is provided on the top surface of the base, and an opening is provided in the middle of the clamping plate, which engages with the measuring pin. The width of the opening is greater than the diameter of the measuring pin. A section pin is provided on the top surface of the base. The side of the clamping plate abuts against the plane of the support and the section pin.

[0014] Preferably, a first vent recess and a second vent recess are respectively provided on the first positioning template and the second positioning template, and the depth of the first vent recess and the second vent recess along the Y direction is greater than the thickness of the flash on the blade forging.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0016] (1) In this invention, the upper journal of the blade forging is supported by a V-block, the end of the positioning pin at point P is pressed against the end face of the tenon of the blade forging, the ball head of the ball head support rod is used to support the lower end face of the tenon of the blade forging, and is pressed against the blade basin of the blade forging by a pressure hook, and the blade back of the blade forging is pushed against the positioning template to complete the clamping and fixing of the blade forging. The positioning and installation of the blade forging is simple and quick.

[0017] (2) In this invention, two positioning templates are set at intervals along the Z direction, and a first arc-shaped contact surface is set on the first positioning template; a second arc-shaped contact surface and a third arc-shaped contact surface are set on the second positioning template. Together with the V-block, P-point positioning pin and ball head support rod, a five-point positioning method is formed for the blade forging. The detection coordinate system can be determined through the upper journal center of the blade, and the surface can be detected by the detection template.

[0018] (3) In this invention, since the V-block is mounted on the vertical arm of the support via a floating structure, it can form a floating support structure along the Y direction. When clamping the blade forging, under the clamping force of the pressure hook, the blade forging can slowly and gradually move towards the positioning template. Due to the floating support structure of the V-block, it is easy to observe the contact between the blade back of the blade forging and the positioning template during the clamping process. At the same time, the force of the formed floating support structure can act on the blade forging in the negative Y direction, combined with the force applied in the positive Y direction on the pressure hook, so that the blade forging is always supported on the V-block, preventing the blade forging from tilting. Attached Figure Description

[0019] 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.

[0020] Figure 1 A schematic diagram of the blade forging that needs to be inspected;

[0021] Figure 2 This is a schematic diagram of the fixture used for surface inspection of aero-engine blade forgings in this invention. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the fixture used for surface inspection of aero-engine blade forgings in this invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the fixture used for surface inspection of aero-engine blade forgings in this invention after the base has been removed.

[0024] Figure 5 This is a schematic diagram of the base in this invention;

[0025] Figure 6 This is a front view of the fixture used for inspecting the profile of aero-engine blade forgings in this invention;

[0026] Figure 7 This is a top view of the fixture used for inspecting the profile of aero-engine blade forgings in this invention;

[0027] Figure 8 for Figure 6 AA view;

[0028] Figure 9 for Figure 6 BB view;

[0029] Figure 10 for Figure 6 CC view;

[0030] Figure 11 for Figure 6 DD view;

[0031] Figure 12 This is a schematic diagram of the structure of the blade forging after clamping.

[0032] Reference numerals: 1. Base; 1a. First oblong hole; 1b. Second oblong hole; 1c. Third oblong hole; 1d. First slide groove; 1e. Second slide groove; 1f. Opening groove; 2. Blade forging; 2a. Blade body; 2b. Tenon; 2c. Upper journal; 2d. Lower journal; 3. Square column; 4. Clamping plate; 5. Measuring pin; 6. Support; 7. First positioning template; 7a. First arc-shaped contact surface; 7b. First opening recess; 8. Second positioning template; 8a. 8b. Second arc-shaped contact surface; 8c. Third arc-shaped contact surface; 9. Second circuit breaker recess; 10. Ball head support rod; 11. P-point positioning pin; 12. Support block; 13. Section pin; 14. Pressure hook; 15. Hinge seat; 16. Adjusting screw; 17. Bushing; 17a. V-block; 17a. Slot; 18. Screw; 19. Positioning pin; 20. Pin shaft; 21. Second spring; 22. Set screw; 23. Nut; 24. Anti-rotation pin; 25. First spring; 26. Floating rod. Detailed Implementation

[0033] 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0034] 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.

[0035] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0036] Combination Figure 1 The diagram shows a schematic of the blade forging 2 to be inspected. The forging comprises a blade body 2a, a tenon 2b, and upper and lower journals 2c and 2d at both ends. A burr ring is also formed around the entire blade. During profile inspection, the inspection coordinate system is typically determined by positioning points on the blade back, tenon 2b, and the cylindrical centerline e of the upper journal 2c. The profile is then inspected using a template.

[0037] Combination Figures 2 to 12 As shown, a fixture for inspecting the profile of an aero-engine blade forging includes a base 1, with a support 6 and a support block 11 disposed on the top surface of the base 1; a V-block 17 is mounted on the vertical arm of the support 6 via a floating structure to support the upper journal 2c of the blade forging 2; the V-block 17 can form a floating support structure along the Y direction; a P-point positioning pin 10 and a ball-head support rod 9 are disposed on the support block 11, the end of the P-point positioning pin 10 is used to abut against the end face of the tenon 2b of the blade forging 2; the ball head of the ball-head support rod 9 is used to support the lower end face of the tenon 2b of the blade forging 2; multiple positioning templates are disposed on the top surface of the base 1; a pressure hook 13 is disposed on the base 1; the pressure hook 13 is used to press against the blade head of the blade forging 2 and push the blade back of the blade forging 2 against the positioning templates.

[0038] With the above structure, the upper journal 2c of the blade forging is supported by the V-block 17, the end of the P-point positioning pin 10 abuts against the end face of the tenon 2b of the blade forging 2, the ball head of the ball head support rod 9 is used to support the lower end face of the tenon 2b of the blade forging 2, and is pressed against the blade basin of the blade forging 2 by the pressure hook 13, and the blade back of the blade forging 2 is pushed against the positioning template to complete the clamping and fixing of the blade forging. The positioning and installation of the blade forging is simple and quick.

[0039] Specifically, in combination Figure 1As shown, the blade forging 2 is positioned using five positioning points (a, b, c, d, p) and the cylindrical centerline e of the upper journal 2c to determine the detection coordinate system. Therefore, in this embodiment, the number of positioning templates is two, spaced apart along the Z direction; the positioning templates include a first positioning template 7 and a second positioning template 8; a first arc-shaped contact surface 7a is provided on the first positioning template 7; a second arc-shaped contact surface 8a and a third arc-shaped contact surface 8b are provided on the second positioning template 8. The arc surface coordinate data of each contact surface comes from the profile coordinate data of the corresponding positioning point during blade design.

[0040] Combination Figure 1 and Figure 12 As shown, during clamping, the ball head of the ball joint 9 is supported at point d, the end of the positioning pin 10 at point P abuts against point p, the first arc-shaped contact surface 7a of the first positioning template 7 is supported at point a, the second arc-shaped contact surface 8a and the third arc-shaped contact surface 8b of the second positioning template 8 are supported at points c and d respectively, and the V-block 17 is supported on the upper journal 2c (i.e., the cylinder centerline e). The entire fixture forms a five-point positioning method for the blade forging 2. The detection coordinate system can be determined through the center e of the upper journal 2c of the blade, and the profile can be detected by using the detection template.

[0041] In this embodiment, the V-shaped opening angle of the V-block 17 is 120°, which ensures that the distance between the opening end face and the parting surface is greater than the thickness of the burr, thus ensuring that the two will not interfere with each other.

[0042] Combination Figure 2 , Figure 3 and Figure 11 As shown, the floating structure between the support 6 and the V-block 17 includes a bushing 16, a floating rod 26, and a first spring 25. The bushing 16 is embedded in the vertical arm of the support 6. The floating rod 26 includes an integrally formed smooth rod portion and a threaded rod portion. The end of the smooth rod portion is fixedly connected to the V-block 17. The smooth rod portion is slidably fitted with the inner hole of the bushing 16. The first spring 25 is sleeved on the smooth rod portion of the floating rod 26, with one end abutting against the V-block 17 and the other end abutting against the vertical arm of the support 6. The threaded rod portion of the floating rod 26 extends out of the bushing 16, and a nut 23 is provided on the threaded rod portion. Specifically, the smooth rod portion of the floating rod 26 and the inner hole of the bushing 16 are in clearance fit, with a single-sided clearance of 0.01 to 0.015 mm.

[0043] Combination Figure 12As shown, due to the use of a floating structure to install the V-block 17, when clamping the blade forging 2, the clamping force of the pressure hook 13 allows the blade forging 2 to slowly and gradually move towards the first positioning template 7 and the second positioning template 8. During the clamping process, it is easy to observe the contact between the blade back of the blade forging 2 and the positioning templates. At the same time, the force of the formed floating support structure can act on the blade forging 2 in the negative Y-axis direction. Combined with the force applied in the positive Y-axis direction on the pressure hook, the blade forging is always supported on the V-block, preventing the blade forging from tilting.

[0044] Combination Figure 2 , Figure 11 As shown, a slot 17a is provided at the lower part of the V-block 17; an anti-rotation pin 24 is provided on the vertical arm of the support 6; the anti-rotation pin 24 is inserted into the slot 17a, and the inner wall of the slot 17a on the outer circumference of the anti-rotation pin 24 is in sliding fit. By utilizing the structure of the slot 17a and the anti-rotation pin 24 in cooperation, the V-block 17 is prevented from flipping during its movement along the axis of the floating rod 26, and the V-shaped support surface of the V-block 17 is always supported on the upper journal 2c of the blade forging 2.

[0045] Combination Figure 2 , Figure 8 As shown, grooves are provided at the front and rear edges of the top surface of the base 1, and a square prism 3 is placed in the grooves. The top surface and outer surface of the square prism 3 are used as inspection reference surfaces. The top surface of the square prism 3 is higher than the top surface of the base 1. The outer surface of the square prism 3 is higher than the front and back surfaces of the base 1. An open slot 1f is provided at the root of the groove in the base 1. When inspecting the blade forging 2 with an inspection template, the inspection template is placed against the top surface and outer surface of the square prism 3 for inspection. The open slot 1f is provided to avoid interference between the square prism 3 and the root of the groove. Since the square prism 3 is easy to process and its reference surface is easy to grind, the base 1 and the square prism 3 are designed as separate structures to facilitate processing. In addition, when the square prism 3 is used for a long time, the reference surface is prone to wear, which can be resolved by replacing the square prism 3.

[0046] Combination Figure 8As shown, the base 1 is a hollow structure with an open lower end; a hinge seat 14 is mounted on the inner wall of the cavity of the base 1; a first oblong hole 1a is provided on the top surface of the base 1, extending into the inner cavity of the base 1; the lower end of the pressure hook 13 passes through the first oblong hole 1a and is connected to the hinge seat 14 via a pin 20; a set screw 22 is screwed onto the front wall of the base 1, the inner end of which extends into the first oblong hole 1a and abuts against the pressure hook 13, for pushing the pressure hook 13 to rotate around the pin 20 to press the blade forging 2. An adjusting screw 15 is screwed onto the front wall of the base 1, located below the set screw 22; a second spring 21 is provided between the adjusting screw 15 and the pressure hook 13, and the second spring 21 is always in a stretched state.

[0047] With the above structure, when it is necessary to tighten the blade forging 2, simply rotate the set screw 22 to push the pressure hook 13 to rotate around the pin 20 to tighten it. When it is necessary to loosen the blade forging 2, rotate the set screw 22 in the opposite direction. The pressure hook 13 rotates around the pin 20 under the action of the second spring 21, while the first spring 25 pushes the blade forging 2 away from the positioning template.

[0048] Combination Figure 4 , Figure 5 As shown, sliders are integrally formed on the bottom of the first positioning template 7 and the second positioning template 8 respectively; a first sliding groove 1d and a second sliding groove 1e are provided on the top surface of the base 1; both the first sliding groove 1d and the second sliding groove 1e are parallel to the Y direction; a second oblong hole 1b is provided at the bottom of the first sliding groove 1d; a third oblong hole 1c is provided at the bottom of the second sliding groove 1e; the first positioning template 7 is installed in the first sliding groove 1d by the slider at its bottom, and a screw is provided in the second oblong hole 1b for locking the first positioning template 7; the second positioning template 8 is installed in the second sliding groove 1e by the slider at its bottom, and a screw is provided in the third oblong hole 1c for locking the second positioning template 8.

[0049] Since the first positioning template 7 and the second positioning template 8 are installed in corresponding grooves via sliders at their bottoms, the sliders can slide within the grooves. During the assembly of the entire fixture, after adjusting the positions of the first positioning template 7 and the second positioning template 8 in the Y-axis direction, the installation of the first positioning template 7 and the second positioning template 8 can be completed by tightening them with the corresponding screws. Therefore, the purpose of setting up the structure where the slider and the groove cooperate is to facilitate the adjustment of the position of the positioning template in the Y-axis direction.

[0050] Combination Figure 3 , Figure 10As shown, a clamping plate 4 is mounted on the top surface of two square columns 3, and a measuring pin 5 is provided on the top surface of the base 1. An opening is provided in the middle of the clamping plate 4, which engages with the measuring pin 5. The width of the opening is greater than the diameter of the measuring pin 5. A section pin 12 is provided on the top surface of the base 1. The side of the clamping plate 4 abuts against the plane of the support 6 and the section pin 12. The structure of the clamping plate 4 and the square columns 3 facilitates the calibration of the dial indicator during testing.

[0051] Combination Figure 8 , Figure 9 As shown, a first vent recess 7b and a second vent recess 8c are respectively provided on the first positioning template 7 and the second positioning template 8, and the depth of the first vent recess 7b and the second vent recess 8c along the Y direction is greater than the thickness of the flash on the blade forging 2. The purpose of providing the vent recess is to avoid interference with the flash on the blade forging 2 and to ensure that the blade back of the blade forging 2 abuts against the arc-shaped contact surface of the first positioning template 7 and the second positioning template 8 when clamped.

[0052] In this embodiment, the length of the ball joint rod 9 and the P-point positioning pin 10 should be greater than the width of the burr on the blade forging to avoid interference with the burr. At the same time, the height of the vertical arm of the support block 11 and the support 6 should be greater than the height of the burr on the blade forging to avoid interference between the top surface of the base 1 and the burr.

[0053] In this embodiment, the bottom of the support block 11 and the support 6 are both provided with mounting bases, and are fixed to the top surface of the base 1 by using two screws 18 and two positioning pins 19 respectively.

[0054] 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 fixture for inspecting the surface profile of aero-engine blade forgings, characterized in that: Includes a base (1), and a support (6) and a support block (11) are provided on the top surface of the base (1). A V-block (17) is installed on the vertical arm of the support (6) via a floating structure to support the upper journal (2c) of the blade forging (2); the V-block (17) can form a floating support structure along the Y direction; A P-point positioning pin (10) and a ball-head support rod (9) are provided on the support block (11). The end of the P-point positioning pin (10) is used to abut against the end face of the tenon (2b) of the blade forging (2). The ball head of the ball-head support rod (9) is used to support the lower end face of the tenon (2b) of the blade forging (2). Multiple positioning templates are provided on the top surface of the base (1); A pressure hook (13) is provided on the base (1); the pressure hook (13) is used to press against the blade head of the blade forging (2) and push the blade back of the blade forging (2) against the positioning template. The floating structure between the support (6) and the V-block (17) includes a bushing (16), a floating rod (26), and a first spring (25). The bushing (16) is fitted into the vertical arm of the support (6); The floating rod (26) includes an integrally formed smooth rod part and a screw part; the end of the smooth rod part is fixedly connected to the V-block (17); the smooth rod part is slidably fitted with the inner hole of the bushing (16); The first spring (25) is sleeved on the smooth part of the floating rod (26), with one end abutting against the V-block (17) and the other end abutting against the vertical arm of the support (6); The threaded portion of the floating rod (26) extends outside the bushing (16), and a nut (23) is provided on the threaded portion. The number of positioning templates is two, which are spaced apart along the Z direction; the positioning templates include a first positioning template (7) and a second positioning template (8); a first arc-shaped contact surface (7a) is provided on the first positioning template (7); a second arc-shaped contact surface (8a) and a third arc-shaped contact surface (8b) are provided on the second positioning template (8); A slider is integrally formed on the bottom of the first positioning template (7) and the second positioning template (8); a first slide groove (1d) and a second slide groove (1e) are provided on the top surface of the base (1). The first slide (1d) and the second slide (1e) are both parallel to the Y direction; a second oblong hole (1b) is provided at the bottom of the first slide (1d); a third oblong hole (1c) is provided at the bottom of the second slide (1e). The first positioning template (7) is installed in the first slide groove (1d) by the slider at its bottom, and a screw is provided in the second waist-shaped hole (1b) for locking the first positioning template (7). The second positioning template (8) is installed in the second slide groove (1e) by a slider at its bottom, and a screw is provided in the third waist-shaped hole (1c) for locking the second positioning template (8).

2. The fixture for inspecting the surface profile of aero-engine blade forgings as described in claim 1, characterized in that: A slot (17a) is provided at the lower part of the V-shaped block (17); An anti-rotation pin (24) is provided on the vertical arm of the support (6); The anti-rotation pin (24) is inserted into the slot (17a), and the outer peripheral surface of the anti-rotation pin (24) slides against the inner wall of the slot (17a).

3. The fixture for inspecting the surface profile of aero-engine blade forgings as described in claim 1, characterized in that: A groove is provided at the front and rear edges of the top of the base (1), and a square column (3) is provided in the groove; the top surface and outer surface of the square column (3) are set as the detection reference surface; the top surface of the square column (3) is higher than the top surface of the base (1); the outer surface of the square column (3) is higher than the front and back of the base (1); an open slot (1f) is provided at the root of the groove of the base (1).

4. The fixture for inspecting the surface profile of aero-engine blade forgings as described in claim 1, characterized in that: The base (1) is a hollow structure with an open lower end; a hinge seat (14) is provided on the inner wall of the cavity of the base (1); a first waist-shaped hole (1a) is provided on the top surface of the base (1) and extends into the inner cavity of the base (1); the lower end of the pressure hook (13) passes through the first waist-shaped hole (1a) and is connected to the hinge seat (14) through the pin (20); a set screw (22) is screwed on the front wall of the base (1), the inner end of the set screw (22) extends into the first waist-shaped hole (1a) and abuts against the pressure hook (13), which is used to push the pressure hook (13) to rotate around the pin (20) to press the blade forging (2).

5. A fixture for inspecting the profile of aero-engine blade forgings as described in claim 4, characterized in that: An adjusting screw (15) is screwed onto the front wall of the base (1). The adjusting screw (15) is located below the set screw (22). A second spring (21) is provided between the adjusting screw (15) and the pressure hook (13). The second spring (21) is always in a stretched state.

6. A fixture for inspecting the surface profile of aero-engine blade forgings as described in claim 3, characterized in that: A card plate (4) is placed on the top surface of two square columns (3), a measuring pin (5) is provided on the top surface of the base (1), and an opening is provided in the middle of the card plate (4), which engages with the measuring pin (5). The width of the opening is greater than the diameter of the measuring pin (5). A section pin (12) is provided on the top surface of the base (1); the side of the card plate (4) abuts against the plane of the support (6) and the section pin (12).

7. A fixture for inspecting the profile of aero-engine blade forgings as described in claim 1, characterized in that: A first vent recess (7b) and a second vent recess (8c) are respectively provided on the first positioning template (7) and the second positioning template (8), and the depth of the first vent recess (7b) and the second vent recess (8c) along the Y direction is greater than the thickness of the flash on the blade forging (2).

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