A functional gauge for inspecting the oil inlet hole of an aero-engine nozzle and its usage method

Abstract

A functional gauge for testing the oil inlet of an aero-engine nozzle and its usage method belong to the field of nozzle testing technology. The base is inserted into the nozzle under test, and the sidewall is connected to a support block. A measuring rod is located inside the support block, and the measuring rod is configured to mate with the oil inlet of the nozzle under test. The method is as follows: The nozzle under test is installed in the positioning bushing, ensuring that the lower surface of the nozzle is in contact with the upper surface of the base; after the measuring rod passes through the guide bushing, the probe is inserted into the oil inlet of the nozzle under test; the operation is stopped when the end face of the measuring end of the measuring rod is in contact with the starting surface of the oil inlet of the nozzle under test; if simultaneously the following conditions are met: the probe is fully inserted into the oil inlet of the nozzle under test without any jamming or blockage, and the rear end face of the guide bushing is located between the high and low platforms of the measuring rod, then the oil inlet of the nozzle under test is considered qualified; otherwise, it is unqualified. This invention saves production time, reduces the labor intensity of metrology personnel, saves production costs for mass production, brings more benefits to enterprises, and is easy to operate without requiring technical expertise.

Description

Technical Field

[0001] This invention relates to a functional gauge for inspecting the oil inlet hole of an aero-engine nozzle and its usage method, belonging to the field of nozzle inspection technology. Background Technology

[0002] Currently, coordinate measuring machines (CMMs) are used to inspect the oil inlet holes of aircraft engine nozzles. However, CMMs are time-consuming, inefficient, and require specialized technicians to operate, making them highly demanding to use. Summary of the Invention

[0003] To address the problems existing in the background art, the present invention provides a functional gauge for detecting the oil inlet hole of an aero-engine nozzle and its usage method.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a functional gauge for detecting the oil inlet of an aero-engine nozzle, comprising a base, a support block, a measuring rod, and a guide bushing; the base is inserted into the nozzle to be tested, the side wall of the base is connected to the lower end of the support block, the upper end of the support block is interference-fitted with the guide bushing, the measuring rod is inserted into the guide bushing, and the measuring rod is configured to cooperate with the oil inlet of the nozzle to be tested.

[0005] The present invention discloses a method for using a functional gauge for inspecting the oil inlet hole of an aero-engine nozzle, the method comprising the following steps:

[0006] S1: The nozzle to be tested is installed in the positioning bushing, and the lower surface of the nozzle to be tested is in contact with the upper surface of the base.

[0007] S2: After the probe passes through the guide bushing, insert the probe into the oil inlet of the nozzle being tested;

[0008] S3: Stop operation when the end face of the measuring end of the probe is in contact with the starting face of the oil inlet of the nozzle being measured;

[0009] S4: If both of the following conditions are met, the oil inlet of the nozzle being tested is considered qualified; otherwise, it is considered unqualified.

[0010] Condition 1: The probe of the probe rod is fully inserted into the oil inlet of the nozzle being tested, and there is no jamming or blockage during the process;

[0011] Condition 2: The rear end face of the guide bushing is located between the high and low platforms at the rear end of the measuring rod.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] This invention adopts the concept of tolerance zone conversion, providing a new design approach for subsequent designs with the same requirements; it changes the measurement of the oil inlet position dimension, which was originally measured by a three-coordinate measuring machine, to a functional gauge, which saves production time, reduces the labor intensity of metrology personnel, saves production costs for mass production, brings more benefits to enterprises, and is easy to operate without technical expertise requirements. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the measuring rod.

[0016] Figure 3 This is a schematic diagram of the structural position of the nozzle being tested;

[0017] Figure 4 This is a schematic diagram showing the conversion between the tolerance zone of a coordinate measuring machine and the tolerance zone of this invention. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] A functional gauge for inspecting the oil inlet of an aero-engine nozzle includes a base 1, a support block 3, a measuring rod 4, and a guide bushing 5. The base 1 is inserted into the nozzle to be tested. The side wall of the base 1 is connected to the lower end of the support block 3. The upper end of the support block 3 is provided with an insertion hole. The guide bushing 5 is interference-fitted into the insertion hole. The measuring rod 4 is inserted into the guide bushing 5. The guide bushing 5 is used to guide the measuring rod 4, thereby ensuring the position and size of the measuring rod 4. The measuring rod 4 is configured to cooperate with the oil inlet of the nozzle to be tested. The measuring rod 4 is used to measure the position and size of the oil inlet of the nozzle to be tested.

[0020] The upper surface of the base 1 has a placement hole in the middle, and a positioning bushing 2 is inserted into the placement hole with an interference fit. During assembly, the upper surface of the positioning bushing 2 must not be higher than the upper surface of the base 1. The positioning bushing 2 is inserted into the lower end of the nozzle to be tested, and the upper surface of the base 1 is in close contact with the lower surface of the nozzle to be tested. The center hole of the positioning bushing 2 and the upper surface of the base 1 are used to position the nozzle to be tested. The side wall of the base 1 is a wedge-shaped surface that slopes inward from top to bottom. The wedge-shaped surface is provided with two cylindrical pins 6. A support block 3 is fitted on the outer side of the cylindrical pins 6. The lower end of the support block 3 is in close contact with the wedge-shaped surface, and the support block 3 is fixedly connected to the base 1 by two cylindrical head screws 7.

[0021] The measuring rod 4 includes a measuring head 10, a measuring end platform 11, a rod body 12, and a height-lowering platform 13; the rod body 12 is inserted into the guide bushing 5, and the measuring end platform 11 is provided at the front end of the rod body 12. The measuring end platform 11 is provided at the front end of the measuring end platform 11. The measuring head 10 is configured to cooperate with the oil inlet of the nozzle being measured. The height-lowering platform 13 is provided at the rear end of the rod body 12.

[0022] The base 1 is provided with a handle 8 on its side wall for easy handling during use.

[0023] The measuring rod 4 has a handle 9 at its rear end, which makes it easy to pick up the measuring rod 4 when in use.

[0024] like Figure 3 As shown, the dimensions to be measured for the oil inlet of the nozzle are a±T1 / 2, b±T2 / 2, and angle α, where a is the abscissa of the measured hole position, b is the ordinate of the measured hole position, T1 is the ordinate tolerance, and T2 is the abscissa tolerance. a±T1 / 2 and b±T2 / 2 determine the machining position of the oil inlet, and angle α determines the axial direction of the oil inlet.

[0025] The gauge structure should be as follows: Positioned using datum plane A, datum axis B, and hole φd, with the measuring rod inserted into the oil inlet hole φd0. Since the theoretical position from coordinate measuring machine measurements cannot be directly used as the tolerance zone for designing functional gauges, we need to convert its tolerance zone according to Taylor's principle of gauge design to meet the requirements of functional gauge design.

[0026] like Figure 4 As shown, the original tolerance zone of the coordinate measuring machine is a rectangular tolerance zone of T1×T2. According to the figure, two lines L1 and L3 parallel to the center line of the part and two lines L2 and L4 perpendicular to the center line of the part are drawn through the four vertices of the rectangular tolerance zone. The rectangle λ×δ formed by L1, L3, L2 and L4 is the new tolerance zone. The new tolerance zone is characterized by being distributed along the radial and axial directions of the measured part, which facilitates the design of gauges and the evaluation of part standards.

[0027] The function of the probe 10 is to check whether the position of the oil inlet hole of the nozzle being tested is qualified; the formula for calculating the diameter of the probe 10 is as follows:

[0028] d c =d0 min -λ+T Z +s

[0029] in:

[0030] d c This indicates the diameter of probe 10;

[0031] d0 min Indicates the maximum material size of the oil inlet orifice of the nozzle being tested and the minimum size of the orifice being tested;

[0032] λ represents the measurement tolerance of the functional gauge;

[0033] T Z Indicates the manufacturing tolerances of the functional gauge;

[0034] s represents the maximum wear amount of the wear limit measurement section.

[0035] The present invention discloses a method for using a functional gauge for inspecting the oil inlet hole of an aero-engine nozzle, the method comprising the following steps:

[0036] S1: The nozzle to be tested is installed in the positioning bushing 2, and the lower surface of the nozzle to be tested is in contact with the upper surface of the base 1.

[0037] S2: After the probe 4 passes through the guide bushing 5, the probe 10 is inserted into the oil inlet of the nozzle being tested;

[0038] S3: Stop operation when the end face of the measuring end plate 11 of the measuring rod 4 is in contact with the starting face of the oil inlet hole of the nozzle being measured;

[0039] S4: If both of the following conditions are met, the oil inlet of the nozzle being tested is considered qualified; otherwise, it is considered unqualified.

[0040] Condition 1: The probe 10 of the probe rod 4 is fully inserted into the oil inlet of the nozzle being tested, and there is no jamming or blockage during the process;

[0041] Condition 2: The rear end face of the guide bushing 5 is located between the high and low platforms 13 at the rear end of the measuring rod 4.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A functional gauge for inspecting the oil inlet hole of an aero-engine nozzle, characterized in that: The device includes a base (1), a support block (3), a measuring rod (4), and a guide bushing (5). The base (1) is inserted into the nozzle to be tested. The side wall of the base (1) is connected to the lower end of the support block (3). The side wall of the base (1) is provided with a handle (8). The upper end of the support block (3) is interference-fitted with a guide bushing (5). The measuring rod (4) is inserted into the guide bushing (5). The measuring rod (4) is matched with the oil inlet of the nozzle to be tested. The upper surface of the base (1) is provided with a placement hole in the middle. The placement hole is interference-fitted with a positioning bushing (2). The positioning bushing (2) is inserted into the lower end of the nozzle to be tested. The upper surface of the base (1) is in close contact with the lower surface of the nozzle to be tested. The side wall of the base (1) is a wedge-shaped surface that slopes inward from top to bottom. The wedge-shaped surface is provided with two cylindrical pins (6), and a support block (3) is fitted on the outer side of the cylindrical pins (6). The lower end of the support block (3) is in close contact with the wedge-shaped surface, and the support block (3) is fixedly connected to the base (1) by two cylindrical head screws (7). The measuring rod (4) includes a measuring head (10), a measuring end platform (11), a rod body (12), and a high and low platform (13). The rod body (12) is inserted into the guide bushing (5), and the measuring end platform (11) is provided at the front end of the rod body (12). The measuring end platform (11) is provided at the front end of the measuring end platform (11). The measuring head (10) is configured to cooperate with the oil inlet of the nozzle being measured. The high and low platform (13) is provided at the rear end of the rod body (12). The formula for calculating the diameter of the measuring head (10) is as follows: in: Indicates the diameter of the probe (10); This indicates the maximum material size of the oil inlet hole of the nozzle being tested; Indicates the measurement tolerance of the functional gauge; Indicates the manufacturing tolerances of the functional gauge; Indicates the wear limit.

2. The functional gauge for detecting the oil inlet hole of an aero-engine nozzle according to claim 1, characterized in that: The measuring rod (4) has a handle (9) at its rear end.

3. A method of using a functional gauge for detecting the oil inlet hole of an aero-engine nozzle according to claim 1 or 2, characterized in that: The method includes the following steps: S1: The nozzle to be tested is installed in the positioning bushing (2), and the lower surface of the nozzle to be tested is in contact with the upper surface of the base (1); S2: After the probe (4) passes through the guide bushing (5), the probe (10) is inserted into the oil inlet of the nozzle being tested; S3: Stop operation when the end face of the measuring end plate (11) of the measuring rod (4) is in contact with the starting face of the oil inlet hole of the nozzle being measured; S4: If both of the following conditions are met, the oil inlet of the nozzle being tested is considered qualified; otherwise, it is considered unqualified. Condition 1: The probe (10) of the probe (4) is fully inserted into the oil inlet of the nozzle being tested, and there is no jamming or blockage during the process; Condition 2: The rear end face of the guide bushing (5) is located between the high and low platforms (13) at the rear end of the measuring rod (4).

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