A three-coordinate measuring tool and measuring method for thin-walled arched components

Abstract

The present invention discloses a three-coordinate measuring tool for a thin-walled arched element and a measuring method. The tool comprises a tool support, a preparation process support, an adjusting gasket, a calibration tool holder set and a measuring process support. The measuring method is mainly divided into a measurement preparation process, a calibration process and a measuring process. The tool uses the measuring tool support to ensure that the thin-walled arched element has constant-temperature ice that fits closely with its inner wall during the calibration process and the measuring process, thereby achieving the effect that the thin-walled arched element does not deform when under pressure during the measuring process, and further accurate data collection can be performed using a three-coordinate measuring instrument.

Description

Technical Field

[0001] The invention relates to the field of three-coordinate measurement of thin-walled arched components, and in particular to a three-coordinate measurement tool and a measurement method for thin-walled arched components. Background Art

[0002] In engineering applications, thin-walled arched components usually require the use of a three-coordinate measuring machine to measure geometric dimensions, shape errors, and surface contours during quality inspection and application. The outer curved surface of thin-walled arched components is very easy to deform under pressure, and the data collected directly through a three-coordinate measuring machine is less accurate. In order to accurately measure the data, it is necessary to select a support mechanism that can adapt to the curvature of the curved surface. Through the close cooperation between the support mechanism and the thin-walled arched component, the thin-walled component can be compressed without deformation, and then the data can be accurately collected through a three-coordinate measuring machine. Summary of the invention

[0003] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a three-coordinate measuring tool for thin-walled arched elements, which can achieve the effect of not deforming the thin-walled elements under pressure through the close cooperation between the supporting mechanism and the thin-walled arched elements, and thus can accurately collect data through a three-coordinate measuring instrument.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a three-coordinate measuring tool for thin-walled arched components, comprising a measuring tool support provided with a thermal grease cavity, wherein the lower end surface of the thermal grease cavity is provided with a grease injection hole and is covered with a cavity cover; the upper end surface of the thermal grease cavity is connected to a water injection cavity and is provided with a guide sleeve;

[0006] A heat-conducting pipe that can slide up and down is placed on the guide sleeve, and the heat-conducting pipe extends out of the water injection cavity; a symmetrically arranged heat-dissipating rib plate group is installed on the two side walls of the heat-conducting silicone grease cavity; a heat-dissipating fan row is installed on the heat-dissipating rib plate group, and the heat-dissipating fan row is used to accelerate air circulation at the rib position and accelerate heat dissipation;

[0007] The thermal grease cavity is provided with a water injection channel connected to the water injection cavity; a groove is formed on one of the side walls of the water injection cavity and a transparent glass sheet is installed thereon for observing the water level in the water injection cavity, and a water level marking line is engraved on the transparent glass sheet;

[0008] A semiconductor cooling sheet coated with thermal grease on both sides is also provided on the side wall of the heat-conducting silicone grease cavity for mounting the heat-dissipating rib plate group, wherein the cooling surface of the semiconductor cooling sheet faces the heat-conducting silicone grease cavity, and the heat-dissipating surface faces the heat-dissipating rib plate group;

[0009] A thin-walled arched element to be tested is placed at the upper end of the water injection cavity, and the arched portion of the thin-walled arched element to be tested can cover the heat conduction pipe; a calibration tool holder set adapted to the thin-walled arched element to be tested is also provided at the upper end of the water injection cavity;

[0010] During the preparation process, the measuring tool support and the preparation process support are fixedly connected by a spring lock and press the thin-walled arched element to be measured;

[0011] During the measurement process, the measuring tool bracket and the measuring process bracket are fixedly connected through a spring lock and press the thin-walled arched element to be measured, the adjustment gasket and the calibration tool holder set; a plurality of fixed brackets are welded on the bottom surface of the thermal grease cavity.

[0012] Preferably, the calibration tool holder set comprises an outer ring, the outer wall of the outer ring is provided with a fixed shaft, the inner wall of the outer ring is provided with an inner ring movable groove and a rotatable inner ring is embedded therein, the outer wall of the inner ring is provided with a movable shaft, the outer ring is provided with a movable shaft limiting groove adapted to the movable shaft, and the movable shaft cooperates with the movable shaft limiting groove to limit the rotational displacement of the inner ring in the inner ring movable groove;

[0013] A fixed spring is connected between the inner ring and the outer ring so that the movable shaft always tends to approach the fixed shaft; a swing rod is also movably connected to the outer ring, and a swing rod mounting hole of the swing rod is adapted to and slidably connected with the swing rod matching shaft of the outer ring;

[0014] The inner ring matching shaft of the swing rod is tangent to the matching side of the groove provided on the inner ring, and the inner ring matching shaft has radial movement relative to the inner ring; the knife edge matching shaft of the swing rod matches with the calibration knife edge mounting hole of the calibration knife edge, and during the matching process, the swing rod matching surface of the calibration knife edge fits with one side of the knife edge matching shaft provided on the swing rod;

[0015] The calibration tool holder set and the upper end of the water injection cavity are also provided with an adjustment gasket, and the thickness of the adjustment gasket is the sum of the thickness of the swing rod and the calibration knife edge.

[0016] Preferably, a spring lock tail is installed on the side wall of the water injection cavity, and a spring lock head adapted to the spring lock tail is provided on the side walls of the measurement process bracket and the preparation process bracket.

[0017] Preferably, the guide sleeve plate is provided with a plurality of guide sleeves for placing heat conduction pipes.

[0018] Preferably, a body cooling plate placement cavity for placing a semiconductor cooling plate is opened on the side wall of the thermal grease cavity where the heat dissipation fan row is installed.

[0019] Preferably, a guide sleeve mounting hole for adapting and welding the guide sleeve is opened on the upper end surface of the thermal grease cavity.

[0020] The present invention also provides a measurement method of the above-mentioned three-coordinate measurement tooling for thin-walled arched components, which is specifically divided into three stages, namely, a measurement preparation process, a calibration process, and a measurement process;

[0021] The method of the measurement preparation process is:

[0022] S71, placing the measuring tool support and the thin-walled arched element to be measured upside down, installing the thin-walled arched element to be measured between the water injection cavity and the preparation process support, with the outer arch surface of the thin-walled arched element to be measured facing the preparation process support, placing a sealing rubber pad between the water injection cavity and the thin-walled arched element to be measured, and placing the same sealing rubber pad between the preparation process support and the thin-walled arched element to be measured;

[0023] S72, connecting the head of the spring lock buckle on the preparation process bracket with the tail of the spring lock buckle on the water injection cavity, and fastening the measuring tool bracket, the sealing rubber pad, the thin-walled arched element to be measured, and the preparation process bracket through the strong pressing action of the spring in the spring lock buckle;

[0024] S73, the heat conducting tube falls naturally under the action of gravity, the round end of the heat conducting tube fits with the inner concave surface of the thin-walled arched element to be measured, and thermal grease is injected into the thermal grease cavity of the measuring fixture bracket. After the thermal grease cavity is filled with thermal grease, the cavity cover is closed;

[0025] S74, injecting clean water into the water injection cavity through the water injection channel, the inner wall surface of the water injection cavity is relatively rough, and the volume of the clean water is determined to be approximately 80%-90% of the volume of the water injection cavity through the transparent glass sheet;

[0026] S75, turning on the power of the semiconductor refrigeration plate and the cooling fan row until the clean water in the water injection cavity is completely frozen, thus completing the preparatory work before the test;

[0027] The method of the calibration process is:

[0028] S76, remove the preparation process bracket, and place the frozen measuring tool bracket, sealing rubber pad, and thin-walled arched element to be measured in a forward direction, assemble the adjustment gasket, calibration tool holder set, and measuring process bracket from top to bottom to form the calibration process fixture, and connect the spring lock buckle head on the measuring process bracket and the spring lock buckle tail on the water injection cavity;

[0029] S77, placing the assembled structure on the work surface of the three-coordinate measuring machine, the fixed bracket of the measuring fixture bracket is fitted and fixed to the work surface of the three-coordinate measuring machine, the measuring fixture bracket is the measuring fixture bracket after the water injection cavity is frozen in the test preparation stage, under the action of the spring, the blade tip of the calibration knife edge is closely fitted with the outer arch surface of the thin-walled arched element to be measured, the opposite surface of the swing arm matching surface of the calibration knife edge is fitted with the outer plane of the thin-walled arched element to be measured, and the center of the outer arch surface on the plane where the outer plane is located is measured by the calibration knife edge;

[0030] S78. The probe of the three-dimensional coordinate measuring machine scans and measures the circular surface of the calibration hemispherical surface of the pendulum rod and records the data. The centers of the three calibration hemispherical surfaces are determined, which are recorded as (x1, y1), (x2, y2), and (x3, y3) respectively. The distance from the center of the calibration hemispherical surface to the outer plane of the thin-walled arched element to be measured is the height of the inner ring matching axis plus the thickness of the pendulum rod plus the thickness of the calibration blade, which is recorded as h. Assuming that the arch origin of the thin-walled arched element to be measured is (a, b), the center of the outer arch surface of the thin-walled arched element on the outer plane can be obtained according to the following formula:

[0031]

[0032] After the calibration process is completed, the measurement process is carried out, specifically:

[0033] S79, remove the calibration tool holder set in the calibration process assembly structure, connect the spring lock head and the spring lock tail on the measurement process bracket, tighten the remaining structures in sequence, fix the connected assembly on the worktable of the three-dimensional coordinate measuring machine, and scan and record the outer arch surface parameters of the thin-walled arched component to be measured;

[0034] S80, the scanning mode is circumferential scanning, the measuring probe performs circumferential measurement along the outer arch surface on the same horizontal plane, records data, changes the horizontal plane position, continues to perform circumferential measurement along the outer arch surface, and records data;

[0035] S81. Measure multiple times according to the above measurement method, import the recorded data into the data analysis software of the three-dimensional coordinate measuring machine, and combine the arch origin as (a, b) to obtain the three-dimensional shape contour of the outer arch surface of the thin-walled arched element to be measured. Finally, according to the thermal expansion coefficient of the material, the arch surface shape of the thin-walled arched element to be measured at 25°C is calculated;

[0036] S88. After the measurement is completed, reverse the power supply of the semiconductor refrigeration plate, measure whether the ice in the water-filled cavity of the fixture bracket is completely melted, disconnect the power supply of the cooling fan row and the semiconductor refrigeration plate, drain the water in the water-filled cavity, and remove the thin-walled arched element to be measured.

[0037] The beneficial effects of the present invention are:

[0038] (1) A closed cavity is formed by the measuring fixture bracket and the thin-walled arched component to be measured, and the fluidity of water is used to fill the internal space of the thin-walled arched component to be measured without dead angles. When the water freezes, it can provide good support for the thin-walled arched component to be measured. This solves the problem that the thin-walled arched components (such as positive arched rupture discs, reverse arched rupture discs, etc.) cannot be measured due to deformation under the pressure of the three-dimensional coordinate measuring machine probe during the three-dimensional coordinate measurement process.

[0039] (2) The present invention uses water as a filler, which has the advantages of being easily available, pollution-free, and easy to remove;

[0040] (3) The heat pipe used in the present invention has high heat transfer efficiency and can fit with the inner wall of the thin-walled arched element to be measured through its own weight, effectively solving the influence of volume expansion of water during freezing on the structural dimensions of the thin-walled arched element to be measured, and ensuring that the ice on the inner wall of the thin-walled arched element to be measured does not melt during the measurement process.

[0041] (4) The calibration blade set and calibration method designed in the present invention effectively solve the problem that it is difficult to determine the coordinate origin of thin-walled arched components. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic structural diagram (exploded diagram) of a three-coordinate measuring tool for thin-walled arched elements provided by an embodiment of the present invention during the measurement preparation process;

[0044] Figure 2 A schematic structural diagram (exploded diagram) of a three-coordinate measuring tool for thin-walled arched elements during a calibration process provided by an embodiment of the present invention;

[0045] Figure 3 A schematic diagram (exploded diagram) of the structure of the three-coordinate measuring tool for thin-walled arched elements provided by an embodiment of the present invention during the measurement process;

[0046] Figure 4 A cross-sectional view of a tooling bracket provided by an embodiment of the present invention in an inverted placement state;

[0047] Figure 5 An exploded structural view of a tooling bracket provided in an embodiment of the present invention;

[0048] Figure 6 A top view of a thermal grease cavity provided in an embodiment of the present invention;

[0049] Figure 7 A top view of a guide sleeve provided in an embodiment of the present invention;

[0050] Figure 8 A top view of a water injection cavity provided in an embodiment of the present invention;

[0051] Fig. 9 A structural diagram of the tooling during the measurement preparation process provided by an embodiment of the present invention;

[0052] Fig.10 A schematic diagram of the structure of a thin-walled arched element to be tested provided by an embodiment of the present invention;

[0053] Fig.11 A cross-sectional view of a preparation process support provided by an embodiment of the present invention;

[0054] Fig.12 A structural diagram of the tooling during the calibration process provided by an embodiment of the present invention;

[0055] Fig.13 The corresponding relationship between the position of the calibration blade and the thin-walled arched element to be measured in the calibration process provided by the embodiment of the present invention;

[0056] Fig.14 An axonometric view of a calibration tool holder set provided in an embodiment of the present invention;

[0057] Fig.15 A bottom view of a calibration tool holder set provided by an embodiment of the present invention;

[0058] Fig.16 A schematic diagram of the structure of a calibration knife edge provided by an embodiment of the present invention;

[0059] Fig.17 A schematic diagram of the structure of a swing rod provided by an embodiment of the present invention;

[0060] Fig.18 An axonometric view of an inner ring provided by an embodiment of the present invention;

[0061] Fig.19 An axonometric view of an outer ring provided in an embodiment of the present invention;

[0062] Fig. 20 A schematic diagram of the structure of a measurement process support provided by an embodiment of the present invention;

[0063] Fig.21 A structural diagram of the tool during the measurement process provided by an embodiment of the present invention.

[0064] Reference numerals:

[0065] 1- measuring tool support; 110- cavity cover; 111- fixed support; 112- water injection channel; 113- cooling fan row; 114- water injection cavity; 115- heat pipe; 116- guide sleeve; 1161- guide sleeve; 117- spring lock tail; 118- semiconductor cooling plate; 119- cooling rib plate group; 120- thermal grease cavity; 121- transparent glass sheet; 122- silicone grease injection hole; 1201- water injection channel mounting hole; 1202- cooling plate placement cavity; 1203- cavity cover mounting thread; 1204- guide sleeve mounting hole; 41- spring lock head; 61-moving shaft; 62-fixed shaft; 63-outer ring; 631-inner ring movable groove; 632-rocker matching shaft; 633-moving shaft limiting groove; 64-inner ring; 65-calibration blade; 66-rocker; 67-spring; 651-calibration blade mounting hole; 652-rocker matching surface; 653-blade tip; 661-rocker mounting hole; 662-inner ring matching shaft; 663-calibration hemispherical surface; 664-blade matching shaft; 2-sealing rubber pad; 3-thin-walled arched element to be measured; 4-preparation process bracket; 5-adjusting gasket; 6-calibration tool holder set; 7-measurement process bracket. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] like Figures 1 to 21 As shown, a three-coordinate measuring tool for thin-walled arched components includes a measuring tool bracket 1 provided with a thermal grease cavity 120, wherein the lower end surface of the thermal grease cavity 120 is provided with a grease injection hole 122 and is covered with a cavity cover 110; the thermal grease cavity 120 is provided with a cavity cover mounting thread 1203 for mounting the cavity cover 110;

[0068] The upper end surface of the thermal grease cavity 120 is connected to the water injection cavity 114 and is provided with a guide sleeve 116;

[0069] A heat pipe 115 capable of sliding up and down is placed on the guide sleeve 116, and the heat pipe 115 extends out of the water injection cavity 114; symmetrically arranged heat dissipation rib groups 119 are installed on both side walls of the thermal grease cavity 120; a heat dissipation fan row 113 is installed on the heat dissipation rib group 119, and the heat dissipation fan row 113 is used to accelerate air circulation at the rib position to accelerate heat dissipation;

[0070] The thermal grease cavity 120 is provided with a water injection channel 112 connected to the water injection cavity 114; the water injection channel 112 is welded to the water injection channel mounting hole 1201 of the thermal grease cavity 120; a groove is formed on one of the side walls of the water injection cavity 114 and a transparent glass sheet 121 is installed thereon for observing the water level in the water injection cavity 114, and a water level marking line is engraved on the transparent glass sheet 121;

[0071] The side wall of the heat-conducting silicone grease cavity 120 on which the heat-dissipating rib group 119 is installed is also provided with a semiconductor cooling sheet 118 coated with heat-conducting silicone grease on both sides, and the side wall of the heat-conducting silicone grease cavity 120 is provided with a body cooling sheet placement cavity 1202 for placing the semiconductor cooling sheet 118, and the cooling surface of the semiconductor cooling sheet 118 faces the heat-conducting silicone grease cavity 120, and the heat-dissipating surface faces the heat-dissipating rib group 119;

[0072] The thin-walled arched element 3 to be tested is placed at the upper end of the water injection cavity 114, and the arched portion of the thin-walled arched element 3 to be tested can cover the heat pipe 115; the upper end of the water injection cavity 114 is also provided with a calibration tool holder set 6 adapted to the thin-walled arched element 3 to be tested;

[0073] During the preparation process, the measuring tool support 1 is fixedly connected with the preparation process support 4 through a spring lock and presses the thin-walled arched element 3 to be measured;

[0074] During the measurement process, the measuring tool bracket 1 is fixedly connected to the measuring process bracket 7 through a spring lock and presses the thin-walled arched element 3 to be measured, the adjustment gasket 5 and the calibration tool holder set 6; a plurality of fixed brackets 111 are welded on the bottom surface of the thermal grease cavity 120.

[0075] The calibration tool holder set 6 comprises an outer ring 63, the outer wall of the outer ring 63 is provided with a fixed shaft 62, the inner wall of the outer ring 63 is provided with an inner ring movable groove 631 and embedded with a rotatable inner ring 64, the outer wall of the inner ring 64 is provided with a movable shaft 61, the outer ring 63 is provided with a movable shaft limiting groove 633 adapted to the movable shaft 61, and the movable shaft 61 cooperates with the movable shaft limiting groove 633 to limit the rotational displacement of the inner ring 64 in the inner ring movable groove 631;

[0076] A fixing spring 67 is connected between the inner ring 64 and the outer ring 63 so that the movable shaft 61 always tends to approach the fixed shaft 62; a swing rod 66 is also movably connected to the outer ring 63, and a swing rod mounting hole 661 of the swing rod 66 is adapted to and slidably connected with the swing rod matching shaft 632 of the outer ring 63;

[0077] The inner ring matching shaft 662 of the swing rod 66 is tangent to the matching side of the groove provided on the inner ring 64, and the inner ring matching shaft 662 has radial movement relative to the inner ring 64; the knife edge matching shaft 664 of the swing rod 66 matches with the calibration knife edge mounting hole 651 of the calibration knife edge 65, and during the matching process, the swing rod matching surface 652 of the calibration knife edge 65 fits with one side of the knife edge matching shaft 664 provided on the swing rod 66;

[0078] The calibration tool holder set 6 and the upper end of the water injection cavity 114 are also provided with an adjustment gasket 5 , and the thickness of the adjustment gasket 5 is the sum of the thickness of the rocker rod 66 and the calibration blade 65 .

[0079] A spring lock tail 117 is installed on the side wall of the water injection cavity 114 , and a spring lock head 41 adapted to the spring lock tail 117 is provided on the side walls of the measurement process bracket 7 and the preparation process bracket 4 .

[0080] The side wall of the heat-conducting silicone grease cavity 120 where the heat dissipation fan row 113 is installed is provided with a body cooling plate placement cavity 1202 for placing the semiconductor cooling plate 118 .

[0081] The guide sleeve plate 116 is provided with a plurality of guide sleeves 1161 for placing the heat conducting pipes 115 .

[0082] The upper end surface of the thermal grease cavity 120 is provided with a guide sleeve mounting hole 1204 for fitting and welding the guide sleeve 116 .

[0083] The present invention also provides a method for using the above-mentioned three-coordinate measurement tooling for thin-walled arched components, which is specifically divided into three stages, namely, a measurement preparation process, a calibration process, and a measurement process;

[0084] The method of the measurement preparation process is:

[0085] S71, placing the measuring tool support 1 and the thin-walled arched element 3 to be measured upside down, installing the thin-walled arched element 3 to be measured between the water injection cavity 114 and the preparation process support 4, with the outer arch surface 31 of the thin-walled arched element 3 to be measured facing the preparation process support 4, placing a sealing rubber pad 2 between the water injection cavity 114 and the thin-walled arched element 3 to be measured, and placing the same sealing rubber pad 2 between the preparation process support 4 and the thin-walled arched element 3 to be measured;

[0086] S72, connecting the spring lock head 41 on the preparation process bracket 4 with the spring lock tail 117 on the water injection cavity 114, and the measuring tool bracket 1, the sealing pad 2, the thin-walled arched element to be measured 3, and the preparation process bracket 4 are fastened and connected by the strong pressing action of the spring in the spring lock;

[0087] S73, the heat conducting tube 115 falls naturally under the action of gravity, the round end of the heat conducting tube 115 fits with the inner concave surface of the thin-walled arched element 3 to be measured, and thermal grease is injected into the thermal grease cavity 120 of the measuring fixture bracket 1. After the thermal grease cavity 120 is filled with thermal grease, the cavity cover 110 is closed;

[0088] S74, inject clean water into the water injection cavity 114 through the water injection channel 112. The inner wall surface of the water injection cavity 114 has a high roughness. Through the transparent glass sheet 121, it is determined that the volume of the clean water is about 80%-90% of the volume of the water injection cavity 114.

[0089] S75, turning on the power of the semiconductor cooling sheet 118 and the cooling fan row 113 until the water in the water injection cavity 114 is completely frozen, thus completing the preparatory work before the test;

[0090] The method of the calibration process is:

[0091] S76, remove the preparation process bracket 4, and place the frozen measuring tool bracket 1, the sealing rubber pad 2, and the thin-walled arched element 3 to be measured in a positive direction, assemble the adjustment gasket 5, the calibration tool holder set 6, and the measuring process bracket 7 from top to bottom to form the calibration process fixture, and connect the spring lock head 41 on the measuring process bracket 7 and the spring lock tail 117 on the water injection cavity 114;

[0092] S77, placing the assembled structure on the work surface of the three-dimensional coordinate measuring machine, the fixed bracket 111 of the measuring fixture bracket 1 is fitted and fixed to the work surface of the three-dimensional coordinate measuring machine, the measuring fixture bracket 1 is the measuring fixture bracket 1 after the water injection cavity 114 is frozen in the test preparation stage, under the action of the spring 67, the blade tip 653 of the calibration blade 65 is tightly fitted with the outer arch surface 31 of the thin-walled arched element 3 to be measured, and the opposite surface of the swing arm matching surface 652 of the calibration blade 65 is fitted with the outer plane 32 of the thin-walled arched element 3 to be measured, and the center of the outer arch surface 31 on the plane where the outer plane 32 is located is measured by the calibration blade 65;

[0093] S78, the probe of the three-dimensional coordinate measuring machine scans and measures the circular surface of the calibration hemispherical surface 663 of the pendulum 66 and records the data, and determines the centers of the three calibration hemispherical surfaces 663, which are respectively recorded as (x1, y1), (x2, y2), and (x3, y3). The distance from the center of the calibration hemispherical surface 663 to the outer plane 32 of the thin-walled arched element 3 to be measured is the height of the inner ring matching shaft 662 plus the thickness of the pendulum 66 plus the thickness of the calibration blade 65, which is recorded as h. Assuming that the arch origin of the thin-walled arched element 3 to be measured is (a, b), the center of the outer arch surface 31 of the thin-walled arched element 3 on the outer plane 32 can be obtained according to the following formula:

[0094]

[0095] After the calibration process is completed, the measurement process is carried out, specifically:

[0096] S79, remove the calibration tool holder set 6 in the calibration process assembly structure, connect the spring lock head 41 and the spring lock tail 117 on the measurement process bracket 7, tighten the remaining structures in sequence, fix the connected assembly on the worktable of the three-dimensional coordinate measuring machine, and scan and record the parameters of the outer arch surface 31 of the thin-walled arched element 3 to be measured;

[0097] S80, the scanning mode is circumferential scanning, the measuring probe performs circumferential measurement along the outer arch surface 31 on the same horizontal plane, records data, changes the horizontal plane position, continues to perform circumferential measurement along the outer arch surface 31, and records data;

[0098] S81, measure multiple times according to the above measurement method, import the recorded data into the data analysis software of the three-dimensional coordinate measuring machine, combine the arch origin as (a, b), and obtain the three-dimensional shape contour of the outer arch surface 31 of the thin-walled arched element 3 to be measured, and finally calculate the arch surface shape of the thin-walled arched element 3 to be measured at 25°C according to the thermal expansion coefficient of the material;

[0099] S88. After the measurement is completed, reverse the power supply of the semiconductor cooling plate 118, measure whether the ice in the water-filled cavity 114 of the tooling bracket 1 is completely melted, disconnect the power supply of the cooling fan row 113 and the semiconductor cooling plate 118, drain the water in the water-filled cavity 114, and remove the thin-walled arched element 3 to be measured.

[0100] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A three-coordinate measuring tool for thin-walled arched components, characterized in that: It comprises a measuring tool support (1) provided with a thermal grease cavity (120); the lower end surface of the thermal grease cavity (120) is provided with a grease injection hole (122) and is covered with a cavity cover (110); the upper end surface of the thermal grease cavity (120) is connected to a water injection cavity (114) and is provided with a guide sleeve (116); A heat-conducting pipe (115) capable of sliding up and down is placed on the guide sleeve (116), and the heat-conducting pipe (115) extends out of the water injection cavity (114); symmetrically arranged heat-dissipating rib groups (119) are installed on both side walls of the heat-conducting silicone grease cavity (120); a heat-dissipating fan row (113) is installed on the heat-dissipating rib group (119), and the heat-dissipating fan row (113) is used to accelerate air circulation at the rib position and accelerate heat dissipation; The thermal grease cavity (120) is provided with a water injection channel (112) connected to the water injection cavity (114); a groove is formed on one of the side walls of the water injection cavity (114) and a transparent glass sheet (121) is installed thereon for observing the water level in the water injection cavity (114); a water level marking line is engraved on the transparent glass sheet (121); A semiconductor cooling sheet (118) coated with thermal grease on both sides is also provided on the side wall of the thermal grease cavity (120) on which the heat dissipation rib group (119) is installed, wherein the cooling surface of the semiconductor cooling sheet (118) faces the thermal grease cavity (120) and the heat dissipation surface faces the heat dissipation rib group (119); A thin-walled arched element (3) to be measured is placed at the upper end of the water injection cavity (114), and the arched portion of the thin-walled arched element (3) to be measured can cover the heat conduction pipe (115); a calibration tool holder set (6) adapted to the thin-walled arched element (3) to be measured is also provided at the upper end of the water injection cavity (114); During the preparation process, the measuring tool support (1) and the preparation process support (4) are fixedly connected by a spring lock and press the thin-walled arched element (3) to be measured; During the measurement process, the measuring tool support (1) and the measuring process support (7) are fixedly connected via a spring lock and press the thin-walled arched element (3) to be measured, the adjustment gasket (5) and the calibration tool holder set (6); a plurality of fixed supports (111) are welded on the bottom surface of the thermal grease cavity (120).

2. A three-coordinate measuring tool for thin-walled arched components as claimed in claim 1, characterized in that: The calibration tool holder set (6) comprises an outer ring (63), the outer wall of the outer ring (63) is provided with a fixed shaft (62), the inner wall of the outer ring (63) is provided with an inner ring movable groove (631) and a rotatable inner ring (64) is embedded therein, the outer wall of the inner ring (64) is provided with a movable shaft (61), the outer ring (63) is provided with a movable shaft limiting groove (633) adapted to the movable shaft (61), and the movable shaft (61) cooperates with the movable shaft limiting groove (633) to limit the rotational displacement of the inner ring (64) in the inner ring movable groove (631); A fixed spring (67) is connected between the inner ring (64) and the outer ring (63) so that the movable shaft (61) always tends to approach the fixed shaft (62); a swing rod (66) is also movably connected to the outer ring (63); a swing rod mounting hole (661) of the swing rod (66) is adapted to and slidably connected to the swing rod matching shaft (632) of the outer ring (63); The inner ring matching shaft (662) of the swing rod (66) is tangent to the matching side surface of the groove provided on the inner ring (64), and the inner ring matching shaft (662) moves radially relative to the inner ring (64); the blade matching shaft (664) of the swing rod (66) matches with the calibration blade installation hole (651) of the calibration blade (65), and during the matching process, the swing rod matching surface (652) of the calibration blade (65) fits with one side of the blade matching shaft (664) provided on the swing rod (66); The calibration knife holder set (6) and the upper end of the water injection cavity (114) are also provided with an adjustment gasket (5), and the thickness of the adjustment gasket (5) is the sum of the thickness of the swing rod (66) and the calibration knife edge (65).

3. A three-coordinate measuring tool for thin-walled arched components as claimed in claim 2, characterized in that: A spring lock tail (117) is installed on the side wall of the water injection cavity (114), and a spring lock head (41) adapted to the spring lock tail (117) is provided on the side walls of the measurement process bracket (7) and the preparation process bracket (4).

4. A three-coordinate measuring tool for thin-walled arched components as claimed in claim 1, characterized in that: The guide sleeve plate (116) is provided with a plurality of guide sleeves (1161) for placing the heat conducting pipes (115).

5. The three-coordinate measuring tool for thin-walled arched components according to claim 1, characterized in that: A body cooling plate placement cavity (1202) for placing a semiconductor cooling plate (118) is provided on the side wall of the heat-conducting silicone grease cavity (120) for installing the cooling fan row (113).

6. The three-coordinate measuring tool for thin-walled arched components according to claim 1, characterized in that: The upper end surface of the thermal grease cavity (120) is provided with a guide sleeve mounting hole (1204) for fitting and welding the guide sleeve (116).

7. A method for measuring a thin-walled arched component three-coordinate measuring tool as claimed in claim 3, characterized in that: It is divided into three stages, namely, measurement preparation process, calibration process and measurement process; The method of the measurement preparation process is: S71, placing the measuring tool support (1) and the thin-walled arched element (3) to be measured upside down, installing the thin-walled arched element (3) to be measured between the water injection cavity (114) and the preparation process support (4), with the outer arch surface (31) of the thin-walled arched element (3) to be measured facing the preparation process support (4), placing a sealing rubber pad (2) between the water injection cavity (114) and the thin-walled arched element (3) to be measured, and placing the same sealing rubber pad (2) between the preparation process support (4) and the thin-walled arched element (3) to be measured; S72, connecting the spring lock head (41) on the preparation process bracket (4) with the spring lock tail (117) on the water injection cavity (114), and fastening the measuring tool bracket (1), the sealing gasket (2), the thin-walled arched element to be measured (3), and the preparation process bracket (4) through the strong pressing action of the spring in the spring lock; S73, the heat conducting tube (115) falls naturally under the action of gravity, the round end of the heat conducting tube (115) fits with the inner concave surface of the thin-walled arched element (3) to be measured, and thermal grease is injected into the thermal grease cavity (120) of the measuring fixture bracket (1). After the thermal grease cavity (120) is filled with thermal grease, the cavity cover (110) is closed; S74, injecting clean water into the water injection cavity (114) through the water injection channel (112), wherein the inner wall surface of the water injection cavity (114) has a high roughness, and through the transparent glass sheet (121), it is determined that the volume of the clean water is 80% to 90% of the volume of the water injection cavity (114); S75, turning on the power of the semiconductor cooling plate (118) and the cooling fan row (113) until the clean water in the water injection cavity (114) is completely frozen, thus completing the preparatory work before the test; The method of the calibration process is: S76, remove the preparation process bracket (4), and place the frozen measuring tool bracket (1), the sealing rubber pad (2), and the thin-walled arched element to be measured (3) in a forward direction, assemble the adjustment gasket (5), the calibration tool holder set (6), and the measuring process bracket (7) from top to bottom to form the calibration process fixture, and connect the spring lock head (41) on the measuring process bracket (7) and the spring lock tail (117) on the water injection cavity (114); S77, placing the assembled structure on the work surface of the three-dimensional coordinate measuring machine, the fixed bracket (111) of the measuring fixture bracket (1) is fitted and fixed to the work surface of the three-dimensional coordinate measuring machine, the measuring fixture bracket (1) is the measuring fixture bracket (1) after the water injection cavity (114) is frozen in the test preparation stage, under the action of the spring (67), the blade tip (653) of the calibration blade (65) is tightly fitted with the outer arch surface (31) of the thin-walled arched element (3) to be measured, and the opposite surface of the swing arm matching surface (652) of the calibration blade (65) is fitted with the outer plane (32) of the thin-walled arched element (3) to be measured, and the center of the outer arch surface (31) on the plane where the outer plane (32) is located is measured by the calibration blade (65); S78, the probe of the three-dimensional coordinate measuring machine scans and measures the circular surface of the calibration hemispherical surface (663) of the pendulum (66) and records the data, and determines the centers of the three calibration hemispherical surfaces (663), which are respectively recorded as (x1, y1), (x2, y2), and (x3, y3). The distance from the center of the calibration hemispherical surface (663) to the outer plane (32) of the thin-walled arched element (3) to be measured is the height of the inner ring matching shaft (662) plus the thickness of the pendulum (66) plus the thickness of the calibration blade (65), which is recorded as h. Assuming that the arch origin of the thin-walled arched element (3) to be measured is (a, b), the center of the outer arch surface (31) of the thin-walled arched element (3) to be measured on the outer plane (32) is obtained according to the following formula: After the calibration process is completed, the measurement process is carried out, which is as follows: S79, remove the calibration tool holder set (6) in the calibration process assembly structure, connect the spring lock head (41) and the spring lock tail (117) on the measurement process bracket (7), tighten the remaining structures in sequence, fix the connected assembly on the worktable of the three-dimensional coordinate measuring machine, and scan and record the parameters of the outer arch surface (31) of the thin-walled arched element (3) to be measured; S80, the scanning mode is circumferential scanning, the measuring probe performs circumferential measurement along the outer arch surface (31) on the same horizontal plane, records data, changes the horizontal plane position, continues to perform circumferential measurement along the outer arch surface (31), and records data; S81, measure multiple times according to the above measurement method, import the recorded data into the data analysis software of the three-dimensional coordinate measuring machine, combine the arch origin as (a, b), and obtain the three-dimensional shape contour of the outer arch surface (31) of the thin-walled arched element (3) to be measured, and finally calculate the arch surface shape of the thin-walled arched element (3) to be measured at 25°C according to the thermal expansion coefficient of the material; S88. After the measurement is completed, the power supply of the semiconductor cooling plate (118) is reversed, and the ice in the water-filled cavity (114) of the measuring tool support (1) is completely melted. The power supply of the cooling fan row (113) and the semiconductor cooling plate (118) is disconnected, the water in the water-filled cavity (114) is drained, and the thin-walled arched element (3) to be measured is removed.

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