Tool and method for measuring chord width of boss of low-pressure rotor blade with convex shoulder

Abstract

The invention relates to the field of aero-engine blade measurement, in particular to a low-pressure rotor blade boss chord width measuring tool with a convex shoulder and a measuring method, the measuring tool can quickly position a blade, and blade angle conversion is achieved by matching tenon positioning with a measuring platform base plate according to boss chord width definition in a blade drawing. The distance relation between virtual points in the space is converted into the distance between measuring faces, numerical comparison is carried out in cooperation with a standard part to measure the difference value, the actual chord width value of the boss is calculated through an online measuring platform, whether the measured data meet the technological requirement or not is judged, the matching relation between the bosses after blade assembling is completed is guaranteed, and the blade assembling precision is improved. And engine vibration is effectively reduced. According to the measuring tool and the measuring method, an efficient, high-precision and traceable chord width measuring means for the low-pressure rotor blade with the boss is provided, the numerical error is smaller than or equal to 0.01 mm through comparison with a three-coordinate measuring numerical value, and the measuring efficiency is improved by 96%.

Description

Technical Field

[0001] The invention relates to the field of aero-engine blade measurement, and in particular to a low-pressure rotor blade boss chord width measuring tool with a boss and a measuring method. Background Art

[0002] Low-pressure rotor blades with bosses are widely used in the field of aviation engines. During the operation of the engine, the blades are affected by complex alternating loads from the outside world. The blade vibration-damping bosses are connected into a ring shape, restricting each other and increasing each other's rigidity. When the blades vibrate, the boss joint surfaces rub against each other, which plays a damping and vibration-reducing role to a certain extent.

[0003] This type of blade with boss has experienced boss misalignment failures many times during flight use. In order to effectively ensure the matching relationship of the low-pressure rotor blades, the chord width of the boss blade needs to be restored by "welding + machining" within a single life cycle. After restoration, it must meet the requirements of the blade manufacturing drawings. Therefore, this dimension needs to be effectively measured after machining. However, this dimension is the spatial dimension between two virtual points in the blade, which cannot be measured directly and can only be obtained in the form of three-coordinate programming. The three-coordinate measurement process of a single blade takes 30 minutes per piece, which cannot meet the production cycle requirements. Summary of the invention

[0004] In view of the above problems, the present invention provides a measuring tool and a measuring method for the chord width of a boss of a low-pressure rotor blade with a boss.

[0005] The adopted technical solution is a low-pressure rotor blade boss chord width measuring tool with a boss, comprising a measuring tool body, wherein the measuring tool body comprises a bottom plate, a height adjustment mechanism, a tenon locking mechanism, a positioning mechanism and a pad; The height adjustment mechanism, positioning mechanism and pad are all arranged on the front side of the base plate, and the height adjustment mechanism is arranged on one side of the base plate; The tenon locking mechanism is arranged on the height adjustment mechanism, and the tenon locking mechanism can clamp the standard part; The positioning mechanism and the backing plate are arranged on the other side of the bottom plate, and the positioning mechanism can be connected with the standard part; The top of the pad is an inclined surface.

[0006] Optionally, the height adjustment mechanism includes a handle, an eccentric wheel and a fixing seat, and one end of the handle is arranged on the side of the bottom plate, and the other end of the handle is inserted into the bottom plate and connected to the eccentric wheel; The eccentric wheel is arranged below the fixing seat and located inside the bottom plate, and the eccentric wheel can adjust the height of the fixing seat; The fixing seat is used for fixing the tenon locking mechanism and is located on the bottom plate.

[0007] Optionally, guide members are provided on both sides of the fixing seat.

[0008] Optionally, the guide member is "L" shaped.

[0009] Optionally, the guide member is detachably connected to the base plate via screws and cylindrical pins.

[0010] Optionally, the tenon locking mechanism includes a nut, a screw, a limit pin and a pressure plate; The screw is inserted into the top of the fixing seat, the screw can push the pressing plate, and one end of the screw is connected to the nut; The pressing plate can clamp the standard part with the fixing seat; The nut is arranged outside the fixing seat; The limit pin is arranged on the fixing seat and faces the positioning mechanism, and the limit pin can clamp the standard part from the side.

[0011] Optionally, the positioning mechanism includes a positioning member and a positioning pin, the positioning member is fixed to the base plate by the positioning pin, and the height of the positioning member is lower than the height of the fixing seat.

[0012] The present application is also based on a low-pressure rotor blade boss chord width measuring tool with a boss, and provides a method for measuring the chord width of a low-pressure rotor blade boss with a boss, comprising the following steps: S1. Clamp the standard part onto a low-pressure rotor blade boss chord width measuring tool with a boss and align it to zero; S2. Clamp the blade to be tested onto a low-pressure rotor blade boss chord width measuring tool with a shoulder and measure it using a micrometer; S3. Preset the chord width data range in the online measurement platform, automatically calculate and judge whether it is qualified.

[0013] Optionally, in S1, the metrological data of the standard part is entered into the online measuring platform, and then the standard part is clamped by the tenon locking mechanism, and then the handle is turned to make the eccentric wheel descend the boss in a free state and place it in the basin-toward boss bottom surface positioning part position, and check whether there is a gap between the standard part and the positioning part. If there is no gap, manually drag the measured boss surface micrometer value in a cross shape until the jump is ≤0.010 mm, and return the digital micrometer to zero.

[0014] Optionally, in S2, the standard part is removed, and the blade to be measured is clamped and measured in the same way as the standard part. The digital dial gauge measures the difference between the actual value of the standard part and the actual value. Click OK, and the dial gauge value is transmitted to the online measurement platform through the data line. The platform calculates the chord width result according to the preset value. In S3, the qualified data range of the chord width is preset in the online measurement platform. If the chord width data meets the process qualification, the value is green and the product is a qualified part. At this time, loosen the nut and take out the measured blade. There is no need to re-align the standard part and continue to measure the next piece.

[0015] The beneficial effects of the present invention are: On the one hand, a low-pressure rotor blade boss chord width measuring tool with a shoulder is provided, which can quickly locate the blade. According to the boss chord width definition in the blade drawing, the blade angle conversion is realized by relying on the tenon positioning and the measuring platform pad. The distance relationship between virtual points in space is converted into the distance between measuring surfaces. The difference is measured by numerical comparison with standard parts, and the actual value of the boss chord width is calculated through an online measuring platform to determine whether the measured data meets the process requirements, so as to ensure the matching relationship between the bosses after the blade is assembled and effectively reduce engine vibration.

[0016] On the other hand, the matching measuring tool provides an adaptive measurement method with the characteristics of high efficiency, high precision and traceability. It adopts the chord width measurement method of low-pressure rotor blades with bosses. By comparing with the three-coordinate measurement value, the numerical error is ≤0.01 mm, and the measurement efficiency is improved by 96%. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of a low-pressure rotor blade with a boss; Figure 2 Define a schematic diagram for the chord width; Figure 3 It is a structural schematic diagram of a special measuring tool for the chord width of low-pressure rotor blades with a boss; Figure 4 A top view of a special measuring tool for the chord width of low-pressure rotor blades with a boss; Figure 5 It is a schematic diagram of a special measuring tool for the chord width of a low-pressure rotor blade with a boss in the AA direction; Figure 6 It is a left view of a special measuring tool for the chord width of low-pressure rotor blades with a boss; Figure 7 It is a schematic diagram of a BB direction of a special measuring tool for the chord width of a low-pressure rotor blade with a boss; Figure 8 This is a CC-direction schematic diagram of a special measuring tool for the chord width of a low-pressure rotor blade with a boss.

[0018] The accompanying drawings are marked as follows: 1 is a base plate, 2 is a pad, 3 is a handle, 4 is a nut, 5 is a fixed seat, 6 is a standard part, 7 is a support foot, 8 is a positioning part, 9 is a nut, 10 is a stop screw, 12 is a limit pin, 13 is an eccentric wheel, 14 is a cylindrical pin, 15 is a screw, 16 is a guide part, 17 is a screw, 18 is a spring, and 19 is a pressure plate. DETAILED DESCRIPTION

[0019] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0020] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0021] like Figures 3 to 8 As shown, a low-pressure rotor blade boss chord width measuring tool with a boss includes a measuring tool body, wherein the measuring tool body includes a base plate 1, a height adjustment mechanism, a tenon locking mechanism, a positioning mechanism and a pad 2; The height adjustment mechanism, positioning mechanism and pad 2 are all arranged on the front side of the base plate 1, and the height adjustment mechanism is arranged on one side of the base plate 1; The tenon locking mechanism is arranged on the height adjustment mechanism, and the tenon locking mechanism can clamp the standard part 6; The positioning mechanism and the backing plate 2 are arranged on the other side of the bottom plate 1, and the positioning mechanism can be connected with the standard part 6; The top of the pad 2 is an inclined surface.

[0022] The purpose of this design is to provide a low-pressure rotor blade boss chord width measuring tool with a shoulder, which can quickly locate the blade. According to the boss chord width definition in the blade drawing, the blade angle conversion is realized by relying on the tenon positioning and the measuring platform pad. The distance relationship between virtual points in space is converted into the distance between measuring surfaces. The difference is measured by numerical comparison with standard parts, and the actual value of the boss chord width is calculated through the online measurement platform to determine whether the measured data meets the process requirements, so as to ensure the matching relationship between the bosses after the blade is assembled and effectively reduce engine vibration.

[0023] In this embodiment, the height adjustment mechanism includes a handle 3, an eccentric wheel 13 and a fixing seat 5, and one end of the handle 3 is arranged on the side of the bottom plate 1, and the other end of the handle 3 is inserted into the bottom plate 1 and connected to the eccentric wheel 13; The eccentric wheel 13 is disposed below the fixing seat 5 and is located inside the bottom plate 1, and the eccentric wheel 13 can adjust the height of the fixing seat 5; The fixing seat 5 is used to fix the tenon locking mechanism and is located on the bottom plate 1 .

[0024] At the same time, guide members 16 are provided on both sides of the fixing seat 5; Furthermore, the guide member 16 is in an "L" shape; At the same time, the guide member 16 is detachably connected to the base plate 1 through the screw 15 and the cylindrical pin 14; Furthermore, the tenon locking mechanism includes a nut 4, a screw rod 17, a stop pin 12 and a pressure plate 19; The screw 17 is inserted into the top of the fixing seat 5, and the screw 17 can push the pressing plate 19, and one end of the screw 17 is connected to the nut 4; The pressing plate 19 can clamp the standard part 6 with the fixing seat 5; The nut 4 is arranged outside the fixing seat 5; The limit pin 12 is arranged on the fixing seat 5 and faces the positioning mechanism. The limit pin 12 can clamp the standard component 6 from the side.

[0025] Meanwhile, the positioning mechanism comprises a positioning member 8 and a positioning pin. The positioning member 8 is fixed on the bottom plate 1 through the positioning pin, and the height of the positioning member 8 is lower than the height of the fixing seat 5 .

[0026] It should be pointed out that, in order to ensure that the entire base plate can be placed stably, supporting feet 7 are provided below the base plate 1 .

[0027] like Figure 1 and Figure 2 As shown, it is a schematic diagram of the structure and chord width definition of a low-pressure rotor blade with a boss. Based on this and according to a chord width measuring tool for a low-pressure rotor blade boss with a shoulder, a method for measuring the chord width of a low-pressure rotor blade boss with a shoulder is provided, comprising the following steps: S1. Clamp the standard part onto a low-pressure rotor blade boss chord width measuring tool with a boss and align it to zero; S2. Clamp the blade to be tested onto a low-pressure rotor blade boss chord width measuring tool with a shoulder and measure it using a micrometer; S3. Preset the chord width data range in the online measurement platform, automatically calculate and judge whether it is qualified.

[0028] The purpose of this design is to provide an adaptive measurement method with the measuring tool, which is efficient, precise and traceable. The chord width of the low-pressure rotor blade with a boss is measured. By comparing with the three-coordinate measurement value, the numerical error is ≤0.01 mm, and the measurement efficiency is improved by 96%.

[0029] In the specific usage scenario, first enter the measurement value of the standard part (82.120 mm) into the online measurement platform, then place the standard part 6 in the tenon locking device, use the nut 4, pressure plate 9, and limit pin 12 to position and clamp the tenon of the standard part, turn the handle 3, so that the eccentric wheel 13 is placed in the free state of the lower boss and placed at the position of the positioning part 8 on the bottom surface of the basin boss, check whether there is a gap between the standard part 6 and the positioning part 8, if there is no gap, manually drag the measured boss surface micrometer value jump ≤0.010mm in a cross shape, and return the digital micrometer to zero. Then remove standard part 6, clamp and measure the blade to be measured in the same way as standard part 6. The difference between the actual value of the digital micrometer and the standard part is -0.020 mm. Click OK, and the micrometer value is transmitted to the online measurement platform through the data line. The platform calculates the chord width according to the preset result, which is 82.092 mm.

[0030] Finally, the qualified data range of chord width 82.070~82.120 mm is preset in the online measurement platform. 82.092 mm meets the qualified process chord width data, the value is green, and the product is a qualified part. At this time, loosen nut 4, take out the measured blade, and continue to measure the next blade without re-calibrating the standard part 6. Since the qualified tolerance range is small, in order to prevent the digital display micrometer from running and causing measurement errors, the standard part needs to be re-confirmed after measuring every 5 blades.

[0031] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-pressure rotor blade boss chord width measuring tool with a boss, comprising a measuring tool body, characterized in that: The measuring tool body comprises a base plate (1), a height adjustment mechanism, a tenon locking mechanism, a positioning mechanism and a backing plate (2); The height adjustment mechanism, the positioning mechanism and the pad (2) are all arranged on the front side of the base plate (1), and the height adjustment mechanism is arranged on one side of the base plate (1); The tenon locking mechanism is arranged on the height adjustment mechanism, and the tenon locking mechanism can clamp the standard part (6); The positioning mechanism and the backing plate (2) are arranged on the other side of the bottom plate (1), and the positioning mechanism can be in contact with the standard part (6); The top of the pad (2) is an inclined surface.

2. A low-pressure rotor blade boss chord width measuring tool with a boss according to claim 1, characterized in that: The height adjustment mechanism comprises a handle (3), an eccentric wheel (13) and a fixing seat (5), wherein one end of the handle (3) is arranged on the side of the base plate (1), and the other end of the handle (3) is inserted into the base plate (1) and connected to the eccentric wheel (13); The eccentric wheel (13) is arranged below the fixing seat (5) and is located inside the bottom plate (1), and the eccentric wheel (13) can adjust the height of the fixing seat (5); The fixing seat (5) is used to fix the tenon locking mechanism and is located on the bottom plate (1).

3. A low-pressure rotor blade boss chord width measuring tool with a boss according to claim 2, characterized in that: Guide members (16) are provided on both sides of the fixing seat (5).

4. A low-pressure rotor blade boss chord width measuring tool with a boss according to claim 3, characterized in that: The guide member (16) is in an "L" shape.

5. A low-pressure rotor blade boss chord width measuring tool with a boss according to claim 4, characterized in that: The guide member (16) is detachably connected to the base plate (1) via a screw (15) and a cylindrical pin (14).

6. A chord width measuring tool for a low-pressure rotor blade boss with a boss according to any one of claims 2 to 5, characterized in that: The tenon locking mechanism comprises a nut (4), a screw rod (17), a limit pin (12) and a pressure plate (19); The screw rod (17) is inserted into the top of the fixing seat (5), the screw rod (17) can push the pressing plate (19), and one end of the screw rod (17) is connected to the nut (4); The pressing plate (19) can clamp the standard part (6) together with the fixing seat (5); The nut (4) is arranged outside the fixing seat (5); The limit pin (12) is arranged on the fixing seat (5) and faces the positioning mechanism. The limit pin (12) can clamp the standard part (6) from the side.

7. A low-pressure rotor blade boss chord width measuring tool with a boss according to claim 6, characterized in that: The positioning mechanism comprises a positioning member (8) and a positioning pin, the positioning member (8) being fixed to the base plate (1) via the positioning pin, and the height of the positioning member (8) being lower than the height of the fixing seat (5).

8. A method for measuring the chord width of a low-pressure rotor blade boss with a shoulder, based on the low-pressure rotor blade boss chord width measuring tool with a shoulder according to claim 7, characterized in that: The following steps are involved: S1. Clamp the standard part onto a low-pressure rotor blade boss chord width measuring tool with a boss and align it to zero; S2. Clamp the blade to be tested onto a low-pressure rotor blade boss chord width measuring tool with a shoulder and measure it using a micrometer; S3. Preset the chord width data range in the online measurement platform, automatically calculate and judge whether it is qualified.

9. A method for measuring the chord width of a low-pressure rotor blade boss with a boss according to claim 8, characterized in that: In S1, the measurement data of the standard part (6) is entered into the online measurement platform, and then the standard part (6) is clamped by the tenon locking mechanism. Then the handle (3) is turned so that the eccentric wheel (13) is lowered to the boss in a free state and placed in the position of the basin-shaped boss bottom surface positioning piece (8). Check whether there is a gap between the standard part (6) and the positioning piece (8). If there is no gap, manually drag the measured boss surface micrometer value jump in a cross shape ≤ 0.010 mm, and return the digital micrometer to zero.

10. A method for measuring the chord width of a low-pressure rotor blade boss with a boss according to claim 9, characterized in that: In S2, the standard part (6) is removed, and the blade to be measured is clamped and measured in the same manner as the standard part (6). The digital display micrometer measures the difference between the actual value of the standard part (6) and the actual value. Click to confirm, and the micrometer value is transmitted to the online measurement platform through the data line. The platform calculates the chord width result according to the preset value. In S3, the qualified data range of the chord width is preset in the online measurement platform. If the qualified chord width data is met, the value is green and the product is a qualified part. At this time, the nut (4) is loosened and the measured blade is taken out. There is no need to re-align the standard part (6) and continue to measure the next blade.

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