Aircraft assembly tool measurement field thermal expansion coefficient calibration device and method thereof

Abstract

The application belongs to the technical field of aircraft assembly tooling measurement field calibration, and particularly relates to a kind of aircraft assembly tooling measurement field thermal expansion coefficient calibration device and method thereof, a calibration method of tooling measurement field temperature compensation nonlinear thermal expansion coefficient with feasibility, universality and integrity is given, which can be well applied to the determination of thermal expansion coefficient of large-size tooling measurement field, accurate temperature compensation is carried out, and it has important guiding significance and universal applicability for high-precision tooling measurement field planning and design of large-size aircraft assembly.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of calibrating the measuring field of an aircraft assembly tooling, and particularly relates to a device and method for calibrating the thermal expansion coefficient of the measuring field of an aircraft assembly tooling. BACKGROUND

[0002] The measuring field of tooling is the reference for measuring the assembly of an aircraft. Based on the existing measuring equipment, the temperature of the whole field is represented by a single point temperature sensor. For large-size aircraft tooling measuring fields, especially those exceeding 30m, the plane temperature difference of a conventional assembly plant with temperature control is 0.1℃ / 10m, and the layer temperature difference is 0.33℃ / m. The measurement accuracy of structures with thermal expansion coefficients will be greatly affected. This kind of influence has a great relationship with the environment of the assembly plant. The temperature change inside the tooling measuring field is difficult to form a relatively fixed trend rule, which is unacceptable in large-size measurement. Inaccurate compensation will cause a large deviation in the actual value of the final measurement.

[0003] Currently, the thermal expansion coefficient of the measuring field of an aircraft assembly tooling is determined by methods such as multi-position scale data difference, single-point temperature representation, and laser interferometer calibration to compensate for the temperature of the tooling measuring field. For multi-point nonlinear temperature changes, a lot of related tests have been conducted, and a large amount of temperature change data of the tooling measuring field has been accumulated. However, due to the independence and systematicness of the measuring equipment software, it is difficult to form a fixed algorithm for short-term compensation of large-scale nonlinear temperature changes and incorporate it into the measuring equipment software. The measurement data of the scale are greatly affected by the measurement distance and the engineering accuracy of the measuring equipment. The single-point temperature representation is affected by factors such as the environmental position of the tooling measuring field, the temperature compensation position, and the temperature change interval. The laser interferometer calibration is limited to fixed guide rails and laboratory conditions, and the engineering nature of on-site measurement and calibration is poor, making it difficult to well adapt to the measuring field of an aircraft assembly tooling.

[0004] The present application is proposed in view of the above technical defects. SUMMARY

[0005] The purpose of the present application is to provide a device and method for calibrating the thermal expansion coefficient of the measuring field of an aircraft assembly tooling, so as to conveniently, conveniently and accurately calibrate the thermal expansion coefficient of the measuring field of an aircraft assembly tooling, determine the compensation coefficient of the nonlinear temperature change of a large-size tooling measuring field, and ensure the assembly measurement of an aircraft.

[0006] The technical solution of the present application is:

[0007] A device for calibrating the thermal expansion coefficient of the measuring field of an aircraft assembly tooling, comprising a standard fixed section, a reflection seat, a sliding positioning assembly, and a sliding measuring assembly.

[0008] The standard fixing section has multiple, spliced into a combined fixing section, arranged on the foundation; the standard fixing section includes a reference plate and a guide rail; the reference plate has multiple standard positioning holes distributed equidistantly along the axial direction; the guide rail is connected to the reference plate;

[0009] The reflecting seats are connected to the foundation and distributed equidistantly along the guide rail, and have semicircular magnetic ball sockets for placing the target reflecting balls for optical reflection of the laser tracker; the centers of the target reflecting balls placed in the magnetic ball sockets of the reflecting seats can form an optical axis parallel to the guide rail;

[0010] The sliding positioning assembly includes a guide rail pair and a positioning plate; the guide rail pair is connected to the guide rail; the positioning plate is connected to the guide rail pair and has positioning alignment holes that can align with the standard positioning holes and be connected by standard positioning pins;

[0011] The sliding measurement assembly includes a vertical sleeve, horizontal sliding rods, a horizontal limiting measurement plate, horizontal springs, a first angle bracket, a horizontal measurement micrometer, a vertical sliding rod, a vertical limiting ring, vertical springs, a vertical measurement plate, a second angle bracket, and a vertical measurement micrometer;

[0012] The vertical sleeve is vertically arranged above the foundation;

[0013] The horizontal sliding rods are horizontally connected to the vertical sleeve and arranged through the guide holes of the sliding positioning assembly;

[0014] The horizontal limiting measurement plate is sleeved to the ends of the horizontal sliding rods away from the vertical sleeve;

[0015] The horizontal springs are sleeved to the ends of the horizontal sliding rods away from the vertical sleeve and abut between the sliding positioning assembly and the horizontal limiting measurement plate;

[0016] The first angle bracket is connected to the sliding positioning assembly and has a first mounting hole;

[0017] The measurement rod of the horizontal measurement micrometer is arranged through the first mounting hole, and the measuring head abuts against the horizontal limiting measurement plate;

[0018] The vertical sliding rod is arranged through the vertical sleeve;

[0019] The vertical limiting ring is sleeved to the upper end of the vertical sliding rod;

[0020] The vertical spring is sleeved to the upper end of the vertical sliding rod and abuts between the upper end of the vertical sliding rod and the vertical limiting ring;

[0021] The vertical measurement plate is sleeved to the lower end of the vertical sliding rod;

[0022] The second angle bracket is connected to the sliding positioning assembly and has a second mounting hole;

[0023] The measuring rod of the vertical measuring micrometer is arranged through the second mounting hole, and the measuring head is abutted against the vertical measuring plate;

[0024] The lower end of the vertical sliding rod is formed with a target hemisphere capable of being aligned and pressed into the magnetic suction ball socket.

[0025] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the standard fixed section further comprises a base plate, an adjustable support, a support framework, and a connecting end plate.

[0026] The base plate is a rectangular plate.

[0027] The adjustable support is connected to the base plate to support the base plate on the foundation and can adjust the horizontal height of the base plate relative to the foundation.

[0028] The support framework is a rectangular framework connected above the base plate.

[0029] The reference plate is a rectangular plate connected above the support framework, with one side edge protruding from the support framework and having a plurality of standard positioning holes distributed equidistantly along the axial direction.

[0030] The connecting end plate has two, connected to the base plate and the support framework at both ends, connected below the reference plate, flush with both ends of the reference plate, and protruding from the support framework on both sides, and adjacent standard fixed sections are connected by the connecting end plate through bolts.

[0031] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the adjustable support of the standard fixed section comprises two groups of height adjustment bolts threadedly connected to the two side edges of the base plate.

[0032] The width of the base plate is greater than the width of the support framework by 50 mm.

[0033] The distance between the standard positioning holes is less than 1 / 10 of the thickness of the foundation.

[0034] The base plate, the support framework, the reference plate, the guide rail, and the connecting end plate are welded as a whole.

[0035] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the distance between each reflection seat is an integer multiple of the distance between the standard positioning holes.

[0036] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the sliding positioning assembly further comprises a lower adapter plate, an upper adapter plate, a long rib plate, an end plate, a short rib plate, and a transverse rib plate.

[0037] The lower adapter plate is a rectangular plate horizontally connected to the guide rail pair.

[0038] The upper adapter plate is a rectangular plate connected to the lower adapter plate.

[0039] The two long rib plates are oppositely arranged and transversely connected to the upper adapter plate, and are bent downward at the end towards the reflecting seat and then outward;

[0040] The end plate is a rectangular plate and is connected to the end of the two long rib plates away from the reflecting seat;

[0041] The two short rib plates are rectangular plates and oppositely arranged and connected between the outwardly bent parts of the two long rib plates;

[0042] The horizontal rib plate is a rectangular plate and is connected between the two short rib plates;

[0043] The positioning plate is triangular and has a bottom connected to the end plate and a tip bent downward and inward, and the inwardly bent part is above the reference plate and has a positioning alignment hole thereon.

[0044] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the vertical sleeve is outside the short rib plate and has an annular boss at the upper end;

[0045] The horizontal slide bar has a rectangular cross section and passes through the guide holes formed in the two short rib plates;

[0046] The horizontal limiting measurement plate is triangular and is arranged between the outwardly bent parts of the two long rib plates, has a bottom connected to the end of the two horizontal slide bars away from the vertical sleeve, and has a tip upward;

[0047] The two horizontal springs are arranged between the short rib plate and the horizontal limiting measurement plate;

[0048] The first angle frame is connected to the horizontal rib plate;

[0049] The horizontal measurement micrometer probe is abutted against the tip of the horizontal limiting measurement plate;

[0050] The vertical spring is arranged between the annular boss and the vertical limiting ring;

[0051] The vertical measurement plate is runway-shaped and has one end connected to the lower end of the vertical slide bar;

[0052] The second angle frame is connected to the outside of the short rib plate;

[0053] The vertical measurement micrometer probe is abutted against the end of the vertical measurement plate away from the vertical slide bar.

[0054] Optionally, in the aircraft assembly tool measurement field thermal expansion coefficient calibration device, the ball profile of the target hemisphere is perpendicular to the guide rail and has crosshairs thereon, and the bottom has a small ball arc protrusion, which is divided into two symmetrical halves by the crosshairs;

[0055] The axis of the vertical slide bar passes through the center of the target hemisphere, and the center of the crosshair is at the center of the target hemisphere, the line width of the crosshair is 5 microns, the line depth is 20 microns, and the crosshair groove is painted red.

[0056] The application discloses a method for calibrating a thermal expansion coefficient of an aircraft assembly tool measurement field.

[0057] Step one, arranging the reflection seats on the foundation of the tool measurement field, and adjusting the ball centers of the target reflection balls placed in the magnetic suction ball pockets of the reflection seats to form an optical axis;

[0058] Step two, preparing standard fixed sections, and splicing the standard fixed sections into a combined fixed section;

[0059] Step three, calibrating the distances between the first standard positioning hole and the subsequent standard positioning holes on the combined fixed section at different temperatures to form a theoretical distance data table;

[0060] Step four, installing the combined fixed section on the foundation of the tool measurement field, and installing the sliding positioning assembly and the sliding measurement assembly on the combined fixed section, and adjusting the guide rails on the combined fixed section to be parallel to the optical axis;

[0061] Step five, pushing the sliding positioning assembly, adjusting the target hemisphere above each reflection seat in turn, and pressing into the magnetic suction ball pocket, and measuring the distance changes of the ball centers of the magnetic suction ball pockets of the reflection seats in the horizontal and vertical directions by using the horizontal and vertical measuring micrometers, and obtaining the axial distance changes of the ball centers of the magnetic suction ball pockets of the reflection seats by using the theoretical distance data table;

[0062] Step six, repeating steps four and five at different temperatures;

[0063] Step seven, comprehensively analyzing the thermal expansion coefficient of the tool measurement field based on the distance changes of the ball centers of the magnetic suction ball pockets of the reflection seats in the horizontal and vertical directions, the axial distance changes of the ball centers of the magnetic suction ball pockets of the reflection seats, and the thermal expansion coefficient of the reference plate material.

[0064] Optionally, in the method, step one comprises:

[0065] S11, taking a longest straight line position on the foundation, arranging the reflection seats along the straight line position, and adjusting the ball centers of the magnetic suction ball pockets of the reflection seats into a straight line as an optical axis by using a laser tracker and target reflection balls;

[0066] S12, adjusting the positions of the reflection seats so that the distances between the reflection seats are integer multiples of the distances between the standard positioning holes;

[0067] S13, using a laser tracker and its target reflecting ball to calibrate the distance between each reflecting seat and the center of the magnetic ball socket;

[0068] S14, using a laser collimator and its optical reflecting target to calibrate the distance between each reflecting seat and the center of the magnetic ball socket, under the condition that the distance between each reflecting seat is an integer multiple of the distance between each standard positioning hole, the center of the magnetic ball socket of each reflecting seat is on the optical axis;

[0069] Step three includes:

[0070] S31, slidingly connecting the sliding positioning assembly to the combined fixed section, and arranging the optical reflecting target of the laser interferometer on the sliding positioning assembly;

[0071] S32, under the standard ambient engineering temperature of 20℃, aligning the positioning alignment hole on the sliding positioning assembly with the first standard positioning hole on the combined fixed section, connecting with the standard positioning pin, and setting the position of the optical reflecting target of the laser interferometer as the zero position of the measured length;

[0072] S33, pulling out the standard positioning pin, pushing the sliding positioning assembly, aligning the positioning alignment hole on the sliding positioning assembly with each subsequent standard positioning hole after the first standard positioning hole on the combined fixed section in turn, connecting with the standard positioning pin, and measuring the distance between the first standard positioning hole and each subsequent standard positioning hole on the combined fixed section using the laser interferometer;

[0073] S34, within the temperature range of 12℃ to 28℃, repeating S33 at a measurement interval of 1℃ or 2℃, and arranging the distance between the first standard positioning hole and each subsequent standard positioning hole on the combined fixed section at different temperatures to form a theoretical distance data table.

[0074] Optionally, in the above aircraft assembly tooling measurement field thermal expansion coefficient calibration method, in step two, the number of standard fixed sections to be prepared is determined by dividing the size greater than 1m of the optical axis by the length of the standard fixed section and rounding up;

[0075] The prepared standard fixed sections are numbered in order, the number of the standard fixed section is marked in red on the side of the support framework, and the standard positioning holes on each independent standard fixed section are numbered from front to back according to the number of the standard fixed section, and the number of the standard positioning hole is marked in red on the reference plate;

[0076] In a standard laboratory, the prepared standard fixed sections are spliced in order to form a combined fixed section, so that the guide pair can smoothly slide on the guide rails of each standard fixed section;

[0077] In step four, the combined fixed section is adjusted, the laser tracker is used for measurement, the height of each standard fixed section is adjusted by using the adjustable support, and the lateral position of each standard fixed section is adjusted by using the side top tool or the hand-held rubber hammer for slight knocking, so that the guide rail on the combined fixed section is parallel to the optical axis;

[0078] In step five, when the target hemisphere is pressed into the magnetic suction ball socket, if the positioning alignment hole is aligned with a standard positioning hole on the combined fixed section, the axial distance change of the ball center of the reflection seat magnetic suction ball socket is directly obtained from the theoretical distance data table; if the positioning alignment hole deviates from the standard positioning hole on the combined fixed section, standard positioning pins are arranged in the positioning alignment hole and the standard positioning hole closest to the positioning alignment hole, the outer edge distance of the two standard positioning pins is measured by using the high-precision micrometer, the sum of the radii of the two standard positioning pins is subtracted, and then the axial distance change of the ball center of the reflection seat magnetic suction ball socket is obtained and calculated by using the theoretical distance data table.

[0079] The present application has at least the following beneficial technical effects:

[0080] The present application provides an aircraft assembly tool measurement field thermal expansion coefficient calibration device and method, and gives a calibration method for the nonlinear thermal expansion coefficient of the tool measurement field temperature compensation, which has feasibility, universality and integrity, can be well applied to the determination of the thermal expansion coefficient of a large-size tool measurement field, accurately compensates the temperature, and has important guiding significance and universal applicability for the planning and design of a high-precision tool measurement field for large-size aircraft assembly. BRIEF DESCRIPTION OF DRAWINGS

[0081] Figure 1 is a structural schematic diagram of the aircraft assembly tool measurement field thermal expansion coefficient calibration device provided by the embodiment of the present application;

[0082] Figure 2 is a sectional view of the aircraft assembly tool measurement field thermal expansion coefficient calibration device provided by the embodiment of the present application;

[0083] Figure 3 is a top view schematic diagram of part of the structure of the aircraft assembly tool measurement field thermal expansion coefficient calibration device provided by the embodiment of the present application;

[0084] Figure 4 is a schematic diagram of part of the structure of the aircraft assembly tool measurement field thermal expansion coefficient calibration device provided by the embodiment of the present application at one angle;

[0085] Figure 5 is a schematic diagram of part of the structure of the aircraft assembly tool measurement field thermal expansion coefficient calibration device provided by the embodiment of the present application at another angle;

[0086] wherein:

[0087] 1-standard fixed segment; 2-reflector base; 3-sliding positioning assembly; 4-sliding measuring assembly; 5-foundation;

[0088] 11-bottom plate; 12-adjustable support; 13-support skeleton; 14-reference plate; 15-guide rail; 16-connection end plate; 17-standard positioning hole;

[0089] 21-optical axis;

[0090] 31-guide rail pair; 32-lower adapter plate; 33-upper adapter plate; 34-long rib plate; 35-end plate; 36-short rib plate; 37-cross rib plate; 38-positioning plate; 39-positioning alignment hole;

[0091] 41-vertical sleeve; 42-horizontal sliding rod; 43-horizontal limit measuring plate; 44-horizontal spring; 45-first angle bracket; 46-horizontal measuring micrometer; 47-vertical sliding rod; 48-vertical limit ring; 49-vertical spring; 410-vertical measuring plate; 411-second angle bracket; 412-vertical measuring micrometer; 413-target hemisphere.

[0092] In order to better illustrate the embodiments, some contents in the drawings can be omitted, enlarged or reduced, which are only used for exemplary illustration and cannot be understood as the limitation of the present application. DETAILED DESCRIPTION

[0093] In order to make the technical solutions of the present application and its advantages clearer, the technical solutions of the present application will be further clearly and completely described in combination with the drawings. It can be understood that the specific embodiments described herein are only part of the embodiments of the present application, which are only used to explain the present application, but not to limit the present application. It should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, and other related parts can be referred to the general design.

[0094] In addition, unless otherwise defined, the technical terms or scientific terms used in the present application description should be the general meanings understood by the general technical personnel in the field to which the present application belongs. The "includes" used in the present application description indicates that the concept appearing before the word covers the concept listed after the word and its equivalents, and does not exclude other related concepts.

[0095] In addition, the words used in the description of the application to indicate relative positional and directional relationships are used to indicate relative positions and directional relationships only, and when the absolute positions of the described objects are changed, the relative positional relationships thereof may also be changed accordingly. It should be noted that, unless otherwise clearly specified and limited, the "installation", "connection" and the like similar words used in the description of the application should be understood in a broad sense, for example, the connection can be fixed connection or detachable connection; can be mechanical connection or electrical connection; can be direct connection or indirect connection through intermediate medium, and the person skilled in the art can understand the specific meaning of the application according to the specific circumstances.

[0096] An aircraft assembly tool measurement field thermal expansion coefficient calibration device, as shown in Figures 1-5 It comprises a standard fixed segment 1, a reflection seat 2, a sliding positioning assembly 3 and a sliding measurement assembly 4.

[0097] The standard fixed segment 1 is composed of multiple standard fixed segments 1 which are spliced together and arranged on the ground base 5.

[0098] The standard fixed segment 1 comprises a bottom plate 11, an adjustable support 12, a support framework 13, a reference plate 14, a guide rail 15 and a connecting end plate 16.

[0099] The bottom plate 11 is a rectangular plate.

[0100] The adjustable support 12 is connected to the bottom plate 11 and supports the bottom plate 11 on the ground base 5, and can adjust the horizontal height of the bottom plate 11 relative to the ground base 5. The adjustable support 12 specifically comprises two groups of height adjustment bolts which are threadedly connected to the two side edges of the bottom plate 11.

[0101] The support framework 13 is a rectangular framework connected above the bottom plate 11. The width of the bottom plate 11 is greater than the width of the support framework 13 by 50mm.

[0102] The reference plate 14 is a rectangular plate connected above the support framework 13, with one side edge protruding from the support framework 13. The side edge has multiple standard positioning holes 17 distributed equidistantly along the axial direction, and the distance between the standard positioning holes 17 is less than 1 / 10 of the thickness of the ground base 5.

[0103] The guide rail 15 is connected to the reference plate 14. The upper surface of the reference plate 14 is provided with a plane reference and a lateral reference, and the lateral reference is located at 1 / 2 of the width of the guide rail 15 away from the direction of the standard positioning holes 17 at the vertical symmetry center line of the support framework 13.

[0104] The connecting end plates 16 are two, connected at the ends of the bottom plate 11 and the support framework 13, connected below the reference plate 14, flush with the ends of the reference plate 14, and protruding from the support framework 13 on both sides, connected between adjacent standard fixed sections 1 through the connecting end plates 16 by bolts, and the bolt holes of the connecting end plates 16 are precisely processed and repaired to ensure smooth transition of the guide rails 15 between the standard fixed sections 1.

[0105] The bottom plate 11, the support framework 13, the reference plate 14, the guide rails 15, and the connecting end plates 16 are welded as a whole and stress is eliminated through vibration and failure double methods.

[0106] The reflection seats 2 are multiple, connected on the foundation 5, on the side of the standard fixed sections 1 away from the standard positioning holes 17, and distributed equidistantly along the axis of the guide rails 15. The distance between each reflection seat 2 is an integer multiple of the distance between the standard positioning holes 17.

[0107] The reflection seats 2 have semicircular magnetic ball pockets for placing the target reflection balls for optical reflection of the laser tracker. The centers of the target reflection balls placed in the magnetic ball pockets of each reflection seat 2 can form an optical axis 21, which is parallel to the guide rails 15.

[0108] The sliding positioning assembly 3 is slidingly connected on the combined fixed section, including a guide rail pair 31, a lower adapter plate 32, an upper adapter plate 33, a long rib plate 34, an end plate 35, a short rib plate 36, a transverse rib plate 37, and a positioning plate 38.

[0109] The guide rail pair 31 is connected on the guide rails 15.

[0110] The lower adapter plate 32 is a rectangular plate, horizontally connected on the guide rail pair 31.

[0111] The upper adapter plate 33 is a rectangular plate, connected on the lower adapter plate 32, and specifically connected between the lower adapter plate 32 through bolts.

[0112] The long rib plate 34 is two, oppositely arranged, transversely connected on the upper adapter plate 33, and one end towards the reflection seat 2 is bent downward and then outward.

[0113] The end plate 35 is a rectangular plate, connected inside the two long rib plates 34 away from the reflection seat 2.

[0114] The short rib plate 36 is a rectangular plate, two oppositely arranged, connected between the outwardly bent parts of the two long rib plates 34.

[0115] The transverse rib plate 37 is a rectangular plate, connected between the two short rib plates 36.

[0116] The positioning plate 38 is triangular, the bottom is connected to the terminal plate 35, the tip is bent downward and inward, the inwardly bent part is above the reference plate 14, and the positioning alignment hole 39 is formed on the tip, which can be aligned with the standard positioning hole 17 and connected by a standard positioning pin.

[0117] The sliding measurement assembly 4 is connected to the sliding positioning assembly 3, which comprises a vertical sleeve 41, a horizontal sliding rod 42, a horizontal limiting measurement plate 43, a horizontal spring 44, a first angle bracket 45, a horizontal measurement dial gauge 46, a vertical sliding rod 47, a vertical limiting ring 48, a vertical spring 49, a vertical measurement plate 410, a second angle bracket 411, and a vertical measurement dial gauge 412.

[0118] The vertical sleeve 41 is vertically arranged above the foundation 5 and outside the short rib plate 36, and the upper end has an annular boss.

[0119] The horizontal sliding rod 42 is rectangular in cross-section and has two parts, which are horizontally connected to the vertical sleeve 41 and arranged through the guide holes formed in the two short rib plates 36.

[0120] The horizontal limiting measurement plate 43 is triangular and arranged between the outwardly bent parts of the two long rib plates 34, the bottom is sleeved on the ends of the two horizontal sliding rods 42 away from the vertical sleeve 41, and the tip is upward. Specifically, the ends of the two horizontal sliding rods 42 away from the vertical sleeve 41 can have a stepped structure, the bottom of the horizontal limiting measurement plate 43 is sleeved on the stepped structure of the two horizontal sliding rods 42, and the horizontal limiting measurement plate 43 is pressed by bolts.

[0121] The horizontal spring 44 has two parts, which are sleeved on the ends of the two horizontal sliding rods 42 away from the vertical sleeve 41 and abut between the short rib plate 36 and the horizontal limiting measurement plate 43.

[0122] The first angle bracket 45 is connected to the cross rib plate 37, specifically connected to the cross rib plate 37 by bolts, and has a first mounting hole.

[0123] The measuring rod of the horizontal measurement dial gauge 46 is arranged through the first mounting hole and can be fastened by a pin, and the measuring head abuts against the tip of the horizontal limiting measurement plate 43.

[0124] The vertical sliding rod 47 is arranged through the vertical sleeve 41.

[0125] The vertical limiting ring 48 is sleeved on the upper end of the vertical sliding rod 47. Specifically, the upper end of the vertical sliding rod 47 can have a stepped structure, and the vertical limiting ring 48 is sleeved on the stepped structure of the vertical sliding rod 47 and pressed by bolts.

[0126] The vertical spring 49 is sleeved on the upper end of the vertical sliding rod 47 and abuts between the annular boss and the vertical limiting ring 48.

[0127] The vertical measuring plate 410 is in the shape of a runway, one end of which is sleeved on the lower end of the vertical slide rod 47 and can be fastened by a pin.

[0128] The second angle bracket 411 is connected to the outside of the short rib plate 36, specifically, it is connected to the outside of the short rib plate 36 by bolts, and has a second mounting hole thereon.

[0129] The measuring rod of the vertical measuring micrometer 412 is arranged through the second mounting hole and can be fastened by a pin, and the measuring head abuts against one end of the vertical measuring plate 410 which is away from the vertical slide rod 47.

[0130] The lower end of the vertical slide rod 47 is formed with a target hemisphere 413 which can be aligned and pressed into the magnetic suction ball socket to simulate the ball head of the reflecting ball and the reflecting seat 2. The cross line is provided on the ball section of the target hemisphere 413 which is perpendicular to the guide rail 15, and the bottom of the target hemisphere 413 is provided with a small ball arc protrusion which is divided into two symmetrical halves by the cross line, so that the target hemisphere 413 can be well fitted with the magnetic suction ball socket.

[0131] The axis of the vertical slide rod 47 passes through the ball center of the target hemisphere 413, and the center of the cross line is at the ball center of the target hemisphere 413. The cross line is engraved by laser line method, with a line width of 5 μm and a line depth of 20 μm, and the line groove is coated with red paint.

[0132] A method for calibrating the thermal expansion coefficient of a measuring field of an aircraft assembly tooling device is based on the above-mentioned device.

[0133] Step one, arrange the reflecting seats 2 on the foundation 5 of the tooling measuring field, and adjust the ball centers of the target reflecting balls placed in the magnetic suction ball sockets of the reflecting seats 2 to form an optical axis 21.

[0134] S11, take the longest straight line position on the foundation 5, arrange the reflecting seats 2 along the straight line position, and use the laser tracker and the target reflecting ball to adjust the ball centers of the magnetic suction ball sockets of the reflecting seats 2 to a straight line as the optical axis 21.

[0135] S12, adjust the positions of the reflecting seats 2 so that the distances between the reflecting seats 2 are integer multiples of the distances between the standard positioning holes 17.

[0136] S13, use the laser tracker and the target reflecting ball to perform a calibration to calibrate the distances between the reflecting seats 2 and the ball centers of the magnetic suction ball sockets.

[0137] S14, use the laser collimator and the optical reflecting target to perform a secondary calibration, under the condition that the distances between the reflecting seats 2 are integer multiples of the distances between the standard positioning holes 17, the ball centers of the magnetic suction ball sockets of the reflecting seats 2 are on the optical axis 21.

[0138] The coordinates of the magnetic ball socket centers of each reflection seat 2 are calibrated in the global coordinate system, and whether the coordinates of the magnetic ball socket centers of the reflection seat 2 are on the optical axis 21 or the deviation from the optical axis 21 is within the measurement accuracy of the laser tracker is analyzed through the measurement software or the modeling software.

[0139] Step two, the standard fixed section 1 is prepared, and each standard fixed section 1 is spliced into a combined fixed section.

[0140] The number of the prepared standard fixed sections 1 is determined according to the size greater than 1 m of the length of the optical axis 21, divided by the length of the standard fixed section 1, and rounded up.

[0141] The prepared standard fixed sections 1 are numbered in order, the number of the standard fixed section 1 is marked on the side of the support framework 13 with red, and the standard positioning holes 17 on each independent standard fixed section 1 are numbered in order from front to back according to the number of the standard fixed section 1, and the number of the standard positioning hole 17 is marked on the reference plate 14 with red.

[0142] In a standard environment laboratory, the prepared standard fixed sections 1 are spliced in order to form a combined fixed section, so that the guide pair 31 can smoothly slide on the guide rail 15 of each standard fixed section 1.

[0143] Step three, the distance between the first standard positioning hole 17 and each subsequent standard positioning hole 17 on the combined fixed section is calibrated at different temperatures to form a theoretical distance data table.

[0144] S31, the sliding positioning assembly 3 is slidably connected to the combined fixed section, and the optical reflection target of the laser interferometer is arranged on the sliding positioning assembly 3.

[0145] S32, at a standard ambient temperature of 20℃, the positioning alignment hole 39 on the sliding positioning assembly 3 is aligned with the first standard positioning hole 17 on the combined fixed section, and the standard positioning pin is connected, and the position of the optical reflection target of the laser interferometer is set as the zero position of the measured length.

[0146] S33, the standard positioning pin is pulled out, and the sliding positioning assembly 3 is pushed so that the positioning alignment hole 39 on the sliding positioning assembly 3 is aligned with each subsequent standard positioning hole 17 after the first standard positioning hole 17 on the combined fixed section in order, and the standard positioning pin is connected, and the distance between the first standard positioning hole 17 and each subsequent standard positioning hole 17 on the combined fixed section is measured by the laser interferometer.

[0147] S34, within the temperature range of 12℃-28℃, with a measurement interval of 1℃ or 2℃, S33 is repeated to arrange the distance between the first standard positioning hole 17 and each subsequent standard positioning hole 17 on the combined fixed section at different temperatures to form a theoretical distance data table.

[0148] Step four, install the combined fixed section to the foundation 5 of the tooling measurement field, and install the sliding positioning assembly 3 and the sliding measurement assembly 4 to the combined fixed section, adjust the guide rail 15 on the combined fixed section to be parallel to the optical axis 21.

[0149] When adjusting the combined fixed section, take the two reflection seats 2 at the farthest position on the optical axis 21 as the initial reference, install the reference with the optical axis 21 as the parallel line, take the lower vertex of the target hemisphere 413 just skimming the upper surface of the reflection seat 2 when sliding as the position installation reference, take the positioning alignment hole 39 aligning with a standard positioning hole 17 on the combined fixed section as the starting reference, and the horizontal measurement micrometer 46 and the vertical measurement micrometer 412 at the theoretical position as the starting reference, and the sliding range of the target hemisphere 413 exceeding 0.3m above and below the optical axis 21 as the motion boundary to arrange the combined fixed section.

[0150] Adjust the combined fixed section, measure with the laser tracker, adjust the height of each standard fixed section 1 with the adjustable support 12, and adjust the lateral position of each standard fixed section 1 with the side top tool or the hand-held rubber hammer to make the guide rail 15 on the combined fixed section parallel to the optical axis 21.

[0151] Step five, push the sliding positioning assembly 3, adjust the target hemisphere 413 to each reflection seat 2 in turn, press down into the magnetic attraction ball socket, measure the distance change of the reflection seat 2 magnetic attraction ball socket center in the horizontal and vertical directions with the horizontal measurement micrometer 46 and the vertical measurement micrometer 412, and obtain the axial distance change of the reflection seat 2 magnetic attraction ball socket center with the theoretical distance data table.

[0152] When the target hemisphere 413 is pressed down into the magnetic attraction ball socket, if the positioning alignment hole 39 is aligned with a standard positioning hole 17 on the combined fixed section, the axial distance change of the reflection seat 2 magnetic attraction ball socket center can be directly obtained from the theoretical distance data table; if the positioning alignment hole 39 deviates from the standard positioning hole 17 on the combined fixed section, a standard positioning pin is arranged in the positioning alignment hole 39 and the standard positioning hole 17 closest to the positioning alignment hole 39, the diameter outer edge margin of the two standard positioning pins is measured with the high-precision micrometer, the sum of the radii of the two standard positioning pins is subtracted, and then the axial distance change of the reflection seat 2 magnetic attraction ball socket center is obtained by searching and calculating from the theoretical distance data table.

[0153] Step six, repeat steps four and five at different temperatures, specifically, repeat steps four and five at two to three larger temperatures.

[0154] Step seven, based on the distance change of the ball center of the magnetic attraction ball socket 2 in the horizontal and vertical directions at various temperatures, the axial distance change of the ball center of the magnetic attraction ball socket 2, and the thermal expansion coefficient of the reference plate 14 material, the thermal expansion coefficient of the tool measurement field is obtained by comprehensive analysis.

[0155] The aircraft assembly tool measurement field thermal expansion coefficient calibration device and method disclosed in the above embodiments can be well applied to the calibration of the temperature compensation of the large-size aircraft assembly tool measurement field.

[0156] The technical solution of the present application has been described in combination with the preferred embodiments shown in the drawings. It should be understood by those skilled in the art that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will fall within the protection scope of the present application.

Claims

1. An aircraft assembly tool measurement field thermal expansion coefficient calibration apparatus, comprising: The utility model relates to a laser tracking instrument fixing device, including standard fixed section (1), reflection seat (2), sliding positioning assembly (3), sliding measurement assembly (4); Standard fixed section (1) has multiple, mutually spliced as combined fixed section, set up on foundation (5), standard fixed section (1) includes datum plate (14), guide rail (15), datum plate (14) has multiple standard positioning hole (17) of equidistance distribution along the axial direction on it, guide rail (15) is connected on datum plate (14); Reflection seat (2) has multiple, connects on foundation (5), along guide rail (15) equidistance distribution in the axial direction, reflection seat (2) has semicircular magnetic attraction ball nest on it, to place the target reflecting ball of optical reflection of laser tracking instrument, the ball center of target reflecting ball placed in each reflection seat (2) magnetic attraction ball nest, can constitute an optical axis (21), this optical axis (21) is parallel with guide rail (15); Sliding positioning assembly (3) includes guide rail pair (31), positioning plate (38), guide rail pair (31) is connected on guide rail (15), positioning plate (38) is connected on guide rail pair (31), has positioning alignment hole (39) on it, positioning alignment hole (39) can be aligned with standard positioning hole (17), and is connected with standard positioning pin; Sliding measurement assembly (4) includes vertical sleeve (41), horizontal slide bar (42), horizontal limit measuring plate (43), horizontal spring (44), first angle frame (45), horizontal measurement dial gauge (46), vertical slide bar (47), vertical limit ring (48), vertical spring (49), vertical measuring plate (410), second angle frame (411), vertical measurement dial gauge (412); Vertical sleeve (41) is vertically set above foundation (5); Horizontal slide bar (42) is horizontally connected on vertical sleeve (41), and is set through the guide hole of sliding positioning assembly (3) and is set up; Horizontal limit measuring plate (43) is sleeved on the end of two horizontal slide bars (42) away from vertical sleeve (41); Horizontal spring (44) has two, is sleeved on the end of two horizontal slide bars (42) away from vertical sleeve (41), and is in sliding positioning assembly (3), horizontal limit measuring plate (43) between; First angle frame (45) is connected on sliding positioning assembly (3), and has first mounting hole on it; The measuring rod of horizontal measurement dial gauge (46) is set through first mounting hole, and the measuring head is in abutment on horizontal limit measuring plate (43); Vertical slide bar (47) is set through vertical sleeve (41); Vertical limit ring (48) is sleeved on the upper end of vertical slide bar (47); Vertical spring (49) is sleeved on the upper end of vertical slide bar (47), and is in the upper end of vertical slide bar (47), vertical limit ring (48) between; Vertical measuring plate (410) is sleeved on the lower end of vertical slide bar (47); Second angle frame (411) is connected on sliding positioning assembly (3), and has second mounting hole on it; The measuring rod of vertical measurement dial gauge (412) is set through second mounting hole, and the measuring head is in abutment on vertical measuring plate (410); The lower end of the vertical slide rod (47) is formed with a target hemisphere (413) capable of being aligned and pressed into a magnetic ball socket.

2. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 1, wherein, The standard fixing section (1) further comprises a base plate (11), an adjustable support (12), a support framework (13), and a connecting end plate (16); The base plate (11) is a rectangular plate; The adjustable support (12) is connected to the base plate (11) to support the base plate (11) on the foundation (5) and can adjust the horizontal height of the base plate (11) relative to the foundation (5); The support framework (13) is a rectangular framework connected above the base plate (11); The reference plate (14) is a rectangular plate connected above the support framework (13) with one side edge protruding from the support framework (13) and having a plurality of standard positioning holes (17) distributed equidistantly along the axial direction on the side edge; The connecting end plate (16) is connected to the two ends of the base plate (11) and the support framework (13) and is connected below the reference plate (14) flush with the two ends of the reference plate (14) and protrudes from the support framework (13) on both sides, and the adjacent standard fixing sections (1) are connected by the connecting end plate (16) through bolting.

3. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 2, wherein, In the standard fixing section (1), the adjustable support (12) comprises two groups of height adjustment bolts threadedly connected to the two side edges of the base plate (11); The width of the base plate (11) is 50mm greater than the width of the support framework (13); The interval between the standard positioning holes (17) is less than 1 / 10 of the thickness of the foundation (5); The base plate (11), the support framework (13), the reference plate (14), the guide rail (15), and the connecting end plate (16) are welded as a whole.

4. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 3, wherein, The interval between the respective reflecting seats (2) is an integer multiple of the interval between the standard positioning holes (17).

5. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 4, wherein, The sliding positioning assembly (3) further comprises a lower adapter plate (32), an upper adapter plate (33), a long rib plate (34), an end plate (35), a short rib plate (36), and a transverse rib plate (37); The lower adapter plate (32) is a rectangular plate horizontally connected to the guide rail pair (31); The upper adapter plate (33) is a rectangular plate connected to the lower adapter plate (32); The long rib plate (34) has two opposite transversely connected upper adapter plates (33), one end of which faces the reflecting seat (2) and is bent downward and then outward; The end plate (35) is a rectangular plate connected to the inner end of the two long rib plates (34) away from the reflecting seat (2); The short rib plate (36) is a rectangular plate having two opposite plates connected between the outwardly bent parts of the two long rib plates (34); The transverse rib plate (37) is a rectangular plate connected between the two short rib plates (36); The positioning plate (38) is triangular with the bottom connected to the end plate (35) and the tip bent downward and inward, and the inwardly bent part is above the reference plate (14) and has a positioning alignment hole (39) thereon.

6. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 5, wherein, In the sliding measurement assembly (4), the vertical sleeve (41) is outside the short rib plate (36) and has an annular boss at the upper end; The horizontal slide rod (42) has a rectangular cross-section and passes through the guide holes formed in the two short rib plates (36); Horizontal limiting measurement plate (43) is triangular, arranged between the two long rib (34) bending outward parts, the bottom of the two horizontal slide bar (42) back to the end of the vertical sleeve (41) set, the tip is upward; Two horizontal springs (44) are between the short rib (36) and the horizontal limiting measurement plate (43); The first angle frame (45) is connected to the horizontal rib (37); The horizontal measuring dial gauge (46) is abutted against the tip of the horizontal limiting measurement plate (43); The vertical spring (49) is between the annular boss and the vertical limiting ring (48); The vertical measurement plate (410) is runway type, one end of which is set in the lower end of the vertical slide bar (47); The second angle frame (411) is connected to the outside of the short rib (36); The vertical measuring dial gauge (412) is abutted against one end of the vertical measurement plate (410) away from the vertical slide bar (47).

7. The aircraft assembly tool measurement coefficient of thermal expansion calibration apparatus of Claim 6, wherein, In the sliding measurement assembly (4), the ball section of the target hemisphere (413) is perpendicular to the guide rail (15), and has crosshairs on it, and the bottom has a small ball arc protrusion, which is divided into two symmetrical halves by the crosshairs; The axis of the vertical slide bar (47) passes through the ball center of the target hemisphere (413), and the center of the crosshairs is at the ball center of the target hemisphere (413), the line width of the crosshairs is 5μm, the line depth is 20μm, and the line groove is coated with red paint.

8. A method for calibrating the coefficient of thermal expansion of an aircraft assembly tooling measurement field based on the apparatus for calibrating the coefficient of thermal expansion of an aircraft assembly tooling measurement field of claim 7, wherein, Comprising: Step one, arranging the reflection seat (2) on the foundation (5) of the tool measurement field, adjusting the ball center of the target reflection ball placed in each reflection seat (2) magnetic attraction ball socket to form an optical axis (21); Step two, preparing the standard fixed section (1), and splicing each standard fixed section (1) into a combined fixed section; Step three, at different temperatures, calibrating the distance between the first standard positioning hole (17) and each subsequent standard positioning hole (17) on the combined fixed section to form a theoretical distance data table; Step four, installing the combined fixed section on the foundation (5) of the tool measurement field, and installing the sliding positioning assembly (3) and the sliding measurement assembly (4) on the combined fixed section, adjusting the guide rail (15) on the combined fixed section to be parallel to the optical axis (21); Step five, pushing the sliding positioning assembly (3), adjusting the target hemisphere (413) to each reflection seat (2) above in turn, and pressing it into the magnetic attraction ball socket, measuring the distance change of the reflection seat (2) magnetic attraction ball socket center in the horizontal and vertical directions by the horizontal measuring dial gauge (46) and the vertical measuring dial gauge (412), and obtaining the axial distance change of the reflection seat (2) magnetic attraction ball socket center by using the theoretical distance data table; Step six, repeating steps four and five at different temperatures; Step seven, based on the distance change of the reflection seat (2) magnetic attraction ball socket center in the horizontal and vertical directions, the axial distance change of the reflection seat (2) magnetic attraction ball socket center, and the thermal expansion coefficient of the reference plate (14) material, comprehensive analysis is carried out to obtain the thermal expansion coefficient of the tool measurement field.

9. The aircraft assembly tool measurement coefficient of thermal expansion calibration method of claim 8, wherein, Step one comprises: S11, take a longest straight line position on the foundation (5), arrange the reflection seat (2) along the straight line position, adjust the ball center of the magnetic attraction ball socket of each reflection seat (2) to a straight line as the optical axis (21) by using the laser tracker and its target reflecting ball; S12, adjust the position of each reflection seat (2) to make the interval between each reflection seat (2) be an integer multiple of the interval between each standard positioning hole (17); S13, calibrate once by using the laser tracker and its target reflecting ball to calibrate the interval between each reflection seat (2) and the ball center of the magnetic attraction ball socket; S14, calibrate twice by using the laser collimator and its optical reflection target, under the condition of ensuring that the interval between each reflection seat (2) is an integer multiple of the interval between each standard positioning hole (17), make the ball center of the magnetic attraction ball socket of each reflection seat (2) be on the optical axis (21); Step three includes: S31, slide the sliding positioning assembly (3) to the combined fixed section, and arrange the optical reflection target of the laser interferometer on the sliding positioning assembly (3); S32, under the standard environmental engineering temperature 20℃, align the positioning alignment hole (39) on the sliding positioning assembly (3) with the first standard positioning hole (17) on the combined fixed section, connect with the standard positioning pin, set the position of the optical reflection target of the laser interferometer as the zero position of the measured length; S33, pull out the standard positioning pin, push the sliding positioning assembly (3), make the positioning alignment hole (39) on the sliding positioning assembly (3) align with each standard positioning hole (17) after the first standard positioning hole (17) on the combined fixed section in turn, connect with the standard positioning pin, measure the distance between the first standard positioning hole (17) and each standard positioning hole (17) after it on the combined fixed section by using the laser interferometer; S34, under the temperature range of 12℃-28℃, take 1℃ or 2℃ as the measurement interval, repeat S33, and arrange the distance between the first standard positioning hole (17) and each standard positioning hole (17) after it on the combined fixed section under different temperatures to form a theoretical distance data table.

10. The aircraft assembly tool measurement coefficient of thermal expansion calibration method of claim 9, wherein, In step two, according to the size greater than 1m of the optical axis (21), divide the length of the standard fixed section (1), and take the integer to determine the number of the prepared standard fixed sections (1); Number the prepared standard fixed sections (1) in order, mark the number of the standard fixed section (1) on the side of the support framework (13) with red, and number the standard positioning holes (17) on each independent standard fixed section (1) from front to back according to the number of the standard fixed section (1), and mark the number of the standard positioning hole (17) on the reference plate (14) with red; In the standard environmental laboratory, splice the prepared standard fixed sections (1) according to the number order to form the combined fixed section, so that the guide pair (31) can slide smoothly on the guide rail (15) of each standard fixed section (1); In step four, the combined fixed section is adjusted, the laser tracker is used for measurement, the adjustable support (12) is used for adjusting the height of each standard fixed section (1), and the lateral position of each standard fixed section (1) is adjusted by using a side top tool or a hand-held rubber hammer to slightly knock, so that the guide rail (15) on the combined fixed section is parallel to the optical axis (21); In step five, when the target hemisphere (413) is pressed into the magnetic ball socket, if the positioning alignment hole (39) is aligned with a standard positioning hole (17) on the combined fixed section, the axial distance change of the ball center of the magnetic ball socket of the reflection seat (2) is directly obtained by using the theoretical distance data table; if the positioning alignment hole (39) deviates from the standard positioning hole (17) on the combined fixed section, standard positioning pins are arranged in the positioning alignment hole (39) and the standard positioning hole (17) closest to the positioning alignment hole (39), the outer edge distance of the two standard positioning pins is measured by using a high-precision micrometer, the sum of the radii of the two standard positioning pins is subtracted, and then the axial distance change of the ball center of the magnetic ball socket of the reflection seat (2) is obtained by using the theoretical distance data table.

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