Headstock external measurement structure and measurement method

Abstract

The invention relates to the field of passenger plane production equipment, in particular to a headstock external measurement structure and a headstock external measurement method, which can ensure the consistency of measurement data of the appearance and key coordination position of a large component and data required for involution of a lower level and improve the involution accuracy and the assembly efficiency of the large component of an airplane. Comprising a to-be-measured machine head and a measuring tool, the measuring tool comprises a supporting bracket, a limiting support is arranged on the supporting bracket, a supporting clamping plate is arranged on the limiting support, the shape of the supporting clamping plate is matched with the curved surface of the bottom of the machine head, and the machine head comprises at least one measuring connector and at least one limiting connector. The measuring tool comprises at least four connecting supports, the connecting supports are arranged at the bottom of the supporting bracket, each connecting support comprises a posture adjusting mechanism used for adjusting the length of the connecting support, and an ERS point is arranged below the machine head. The device is especially suitable for external measurement of the headstock.

Description

Technical Field

[0001] The invention relates to the field of passenger aircraft production equipment, and in particular to an external measurement structure of a nose frame and a measurement method. Background Art

[0002] The large nose component is also the process separation surface of large aircraft design. The large nose component is located at the front of the aircraft. The structure mainly includes the cockpit, front landing gear compartment, wall panel components, etc. Among them, the factory separation surfaces such as the end frame and the front landing gear compartment need to be coordinated with other structures or finished products. According to the main manufacturer-supplier division of labor model of aircraft manufacturing, after the assembly of large components such as the nose, middle fuselage, and rear fuselage, in order to ensure that the large nose components can be accurately and efficiently assembled in the lower-level matching stage, it is necessary to carry out the pre-matching status of large components such as the nose in advance through the off-frame attitude measurement tooling. In the existing scheme, the main support is the riveting bracket for the large nose components, which cannot simulate the posture of the lower-level assembly of large components such as the nose. The data results are fitted and analyzed by the digital measurement system, which cannot accurately reflect the actual status of the large components. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an external measurement structure and a measurement method for the nose frame, which can complete the posture adjustment and coordinate system establishment of large components such as the nose through an adjustable connecting support and an ERS point, ensure the consistency of the measurement data of the large component shape and key coordination positions with the data required for the lower-level matching, and improve the accuracy of the matching of large aircraft components and the assembly efficiency.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a measurement structure outside a machine head frame, including a machine head to be measured and a measuring tool, the measuring tool including a supporting bracket, a limit support is arranged on the supporting bracket, a supporting card is arranged on the limit support, the shape of the supporting card matches the curved surface of the bottom of the machine head, the machine head includes at least one measuring joint and at least one limit joint, the measuring tool includes at least four connecting supports, the connecting supports are arranged at the bottom of the supporting bracket, each connecting support includes a posture adjustment mechanism for adjusting the length of the connecting support, and an ERS point is arranged under the machine head.

[0005] Furthermore, the adjustment direction of the posture adjustment mechanism includes horizontal, longitudinal and vertical directions.

[0006] Furthermore, the posture adjustment mechanism includes at least three hydraulic rods, and the telescopic directions of the three hydraulic rods are horizontal, longitudinal and vertical respectively.

[0007] Furthermore, the connecting support is a ball head connecting support.

[0008] Furthermore, the number of ERS points is at least 14.

[0009] Furthermore, the head outside the frame measurement method includes the following steps: a. Install auxiliary process joints during the head assembly stage, the auxiliary process joints include at least one limit joint and at least one measuring joint; b. Fix the head: after the head assembly is completed, hoist the head onto the support bracket, and complete the fixed installation of the limit joint and the upper limit support on the support bracket; c. Prepare for posture adjustment before measurement: during the laser tracker measurement stage, adjust the horizontal, longitudinal and vertical positions of the 4 posture adjustment mechanisms through 14 ERS points and 4 measuring hole coordinate points of the measuring joints, and monitor the specific values ​​of the measuring joint coordinate points in real time until the coordinates of the measuring joint coordinate points meet the tolerance range, and the tolerance range is -0.3mm to +0.3mm; d. Carry out relevant measurements: complete the measurement of various relevant shapes and coordinated positions of the head, and complete the measurement data analysis report; e. Complete the measurement work: after the laser tracker measurement is completed, it will be hoisted to the next workstation to complete the measurement work of the outside frame measurement tooling.

[0010] The beneficial effects of the present invention are as follows: in actual use, the posture adjustment mechanism and the ERS coordinate point first complete the posture adjustment of the machine head and the establishment of the coordinate system, ensuring the consistency of the measurement data of the machine head shape and key coordination positions with the data required for the lower-level alignment. At the same time, the posture adjustment mechanism meets the adjustment dimensions in three directions, the minimum adjustment scale can reach 0.5mm, and the adjustment accuracy can reach within -0.3mm to +0.3mm, so that the lower-level pre-alignment state of large components such as the machine head can be simulated, and the accuracy and assembly efficiency of the machine head alignment can be improved. At the same time, the posture adjustment mechanism can adopt a conventional hydraulic drive structure, without the need to adopt digital intelligent equipment, which can greatly reduce the tooling cost. The present invention is particularly suitable for external measurement of the machine head frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the off-frame measurement tooling of the present invention.

[0012] Figure 2 It is a structural schematic diagram of a handpiece of the present invention.

[0013] Figure 3 yes Figure 2 A-axis enlarged view.

[0014] Figure 4 It is a schematic diagram showing that the machine head of the present invention is installed on the off-frame measuring tooling.

[0015] Figure 5 yes Figure 4 B-direction enlarged view.

[0016] Marked in the figure are: support bracket 1, support card plate 2, limit support 3, ball head connecting support 4, posture adjustment mechanism 5, ERS point 6, measuring joint 7, fixed head 71, limit joint 8, limit joint connecting structure 9. DETAILED DESCRIPTION

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] like Figure 1 , Figure 2 , Figure 3 The head frame external measurement structure shown includes a head 71 to be measured and a measuring tool, the measuring tool includes a support bracket 1, a limit support 3 is provided on the support bracket 1, a support card 2 is provided on the limit support 3, the shape of the support card 2 matches the bottom curved surface of the head 71, the head 71 includes at least one measuring joint 7 and at least one limit joint 8, the measuring tool includes at least four connecting supports, the connecting supports are provided at the bottom of the support bracket 1, each connecting support includes a posture adjustment mechanism 5 for adjusting the length of the connecting support, and an ERS point 6 is provided below the head 71. Preferably, the connecting support is a ball head connecting support 4. In actual arrangement, the number of ERS points can be selected to be at least 14.

[0019] In actual testing, the ERS point detection method is used. ERS, the full name of which is Enhanced Reference System, is translated into Enhanced Coordinate System in Chinese. During the jig assembly process, the laser tracker cannot complete the test of all OTP points at a certain station due to the obstruction of the laser beam by the jig. Therefore, it is necessary to adjust its position and continue to assemble the jig. ERS is a conventional test point of the enhanced tooling coordinate system.

[0020] The specific detection method is as follows: a. Install auxiliary process joints during the assembly of the machine head 71, and the auxiliary process joints include at least one limit joint 8 and at least one measuring joint 7; b. Fix the machine head 71: After the assembly of the machine head 71 is completed, the machine head 71 is hoisted to the support bracket 1, and the limit joint 8 and the upper limit support 3 of the support bracket 1 are fixed and installed; c. Preparation for posture adjustment before measurement: During the laser tracker measurement stage, the horizontal, longitudinal and vertical positions of the four posture adjustment mechanisms 5 are adjusted through the 14 ERS points 6 and the measuring hole coordinate points of the four measuring joints 7, and the specific values ​​of the coordinate points of the measuring joints 7 are monitored in real time until the coordinates of the coordinate points of the measuring joints 7 meet the tolerance range, and the tolerance range is -0.3mm to +0.3mm. d. Carry out relevant measurements: Complete the measurement of various related shapes and coordinated positions of the machine head 71, and complete the measurement data analysis report; e. Complete the measurement work: After the laser tracker measurement is completed, 71 is hoisted to the next station to complete the measurement work of the off-frame measurement tooling.

[0021] Generally, in order to realize that the posture adjustment mechanism 5 can accurately adjust the angle of the machine head 71, the following scheme can be selected: the adjustment direction of the posture adjustment mechanism 5 includes horizontal, longitudinal and vertical directions. In actual design, in order to reduce the corresponding manufacturing cost, it is preferred that the posture adjustment mechanism 5 includes at least three hydraulic rods, and the telescopic directions of the three hydraulic rods are horizontal, longitudinal and vertical respectively.

[0022] The limit joint 8 and the measuring joint 7 can be made of 45# steel and some standard parts. The limit joint 8 is used for limiting the position of the large parts such as the machine head 71 after they are supported, to ensure that the large parts avoid displacement during the posture adjustment process. The measuring joint 7 is used for auxiliary measurement during the assembly process of the large parts such as the machine head 71, and can effectively transmit digital quantities and positioning references.

[0023] The support bracket 1 and support clamp 2 of the head frame external measurement structure support the head 71, and the limit joint 8 installed on the head 71 is fixedly limited by the 4 limit supports 3 to avoid movement, ensuring the support state of the head 71 when it is closest to the lower pre-alignment. The support bracket 1 is connected to the 4 posture adjustment mechanisms 5 through a ball head to ensure that the overall bracket can move flexibly and coordinately during posture adjustment. The 4 posture adjustment mechanisms 5 and 14 ERS points 6 of the head frame external measurement structure complete the posture adjustment of the head 71 and the establishment of the coordinate system, ensuring the consistency of the measurement data of the shape and key coordination positions of the head 71 with the data required for the lower alignment.

Claims

1. A head frame external measurement structure, comprising a head (71) to be measured and a measuring tool, the measuring tool comprising a support bracket (1), a limit support (3) being arranged on the support bracket (1), a support card (2) being arranged on the limit support (3), the shape of the support card (2) matching the bottom curved surface of the head (71), the head (71) comprising at least one measuring joint (7) and at least one limit joint (8), characterized in that: The measuring tool comprises at least four connecting supports, which are arranged at the bottom of a supporting bracket (1), each connecting support comprises a posture adjustment mechanism (5) for adjusting the length of the connecting support, and an ERS point (6) is arranged below the machine head (71).

2. The headstock external measurement structure according to claim 1, characterized in that: The adjustment directions of the posture adjustment mechanism (5) include horizontal, longitudinal and vertical directions.

3. The headstock external measurement structure according to claim 2, characterized in that: The posture adjustment mechanism (5) comprises at least three hydraulic rods, and the telescopic directions of the three hydraulic rods are horizontal, longitudinal and vertical respectively.

4. The headstock external measurement structure according to claim 1, characterized in that: The connecting support is a ball head connecting support (4).

5. The headstock external measurement structure according to any one of claims 1 to 4, characterized in that: The number of ERS points must be at least 14.

6. A measuring method using the headstock external measuring structure according to any one of claims 1 to 5, characterized in that: The steps include: a. installing auxiliary process joints during assembly of the machine head (71), wherein the auxiliary process joints include at least one limit joint (8) and at least one measuring joint (7); b. Fixing the machine head (71): After the machine head (71) is assembled, the machine head (71) is hoisted onto the support bracket (1), and the limit joint (8) and the upper limit support (3) of the support bracket (1) are fixedly installed; c. Preparation for posture adjustment before measurement: During the laser tracker measurement phase, the horizontal, longitudinal and vertical positions of the four posture adjustment mechanisms (5) are adjusted through the 14 ERS points (6) and the measuring hole coordinate points of the four measuring joints (7), and the specific values ​​of the coordinate points of the measuring joints (7) are monitored in real time until the coordinates of the coordinate points of the measuring joints (7) meet the tolerance range, which is -0.3 mm to +0.3 mm; d. Carry out relevant measurements: complete the measurement of various relevant shapes and coordinated positions of the nose (71), and complete the measurement data analysis report; e. Completion of measurement work: After the laser tracker measurement is completed, (71) is hoisted to the next workstation to complete the measurement work of the external measurement tooling.

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