A detection device for accurately positioning and detecting skeleton parts

Abstract

The present invention relates to a detection device for accurately positioning and detecting skeleton parts, which belongs to the field of aerospace navigation applications; it comprises a part detection support column, a positioning and locking support column, a locking block, a support pin, a locking nut, a three-jaw chuck, a three-jaw positioning bolt, and a three-coordinate measuring machine plate. The center position of the upper surface of the part detection support column is set to a small step concave hole consistent with the outer diameter of the measured part according to the part positioning requirements, and is in close contact with the measured part. The outer thread of the positioning and locking support column is threadedly connected with the part detection support column, and the through holes at both ends of the locking block pass through the outer thread of the positioning and locking support column. The support pin and the locking nut are threadedly connected at the center position of the locking block; a torque wrench is used to rotate the locking nuts at the left and right ends so that the support pin gives a certain clamping force to the skeleton part to clamp the part; each time the detection device replaces the measured part, the locking nuts at the left and right ends can be loosened to replace the measured skeleton part, and the effect of quickly replacing the measured part can be achieved.

Description

Technical Field

[0001] The invention belongs to the field of aerospace navigation applications and relates to a detection device for accurately positioning and detecting skeleton parts. Background Art

[0002] The skeleton parts are the core and key parts of the quartz flexure accelerometer. The skeleton parts are mainly used as the support base of the torque coil of the quartz accelerometer, and are bonded to both sides of the quartz film-coated pendulum to form the sensitive mass of the quartz accelerometer - the pendulum assembly. At the same time, under the drive of the servo circuit, the pendulum assembly relies on electromagnetic force to make the pendulum assembly sensitive to the input acceleration and reciprocate. The skeleton parts have the characteristics of thin wall and high precision.

[0003] In terms of the skeleton part structure, the bottom thickness is 0.3mm, the winding ring groove wall thickness is only 0.1mm, and the error requirement is ±0.01mm. It is a typical thin-walled precision part with poor strength and rigidity, complex and irregular geometry, and easy deformation and damage.

[0004] The inner and outer circles and axial end faces of the skeleton parts need to be finely processed to ensure the size and shape accuracy. Therefore, the process arrangement needs to be divided into rough processing, semi-finishing, finishing, stabilization treatment, etc. to ensure the elimination of processing stress. Design a special low-stress clamping and positioning device to ensure that the stress deformation during processing, clamping and testing is reduced, thereby affecting the accuracy of the sensitive accelerometer of the quartz accelerometer pendulum assembly.

[0005] The clamping method during the inspection of skeleton parts uses the outer bottom surface of the part as the clamping surface and the inner bottom surface of the part as the clamping force surface. The direction and magnitude of the clamping force should be carefully selected and controlled. The clamping and positioning of the parts should be stable and reliable to reduce the possibility of clamping deformation. The magnitude of the clamping force should be based on the measurement force that can withstand the probe pick-up point of the three-dimensional measuring machine. Considering that the measurement force of the probe pick-up point is very small, a torque wrench is used to clamp the skeleton parts, and the clamping force is set to 1N for clamping.

[0006] The traditional inspection method for skeleton parts is that because the parts are thin-walled parts and the parts themselves have a small structure, in order to prevent the parts from being deformed by force, the parts cannot be clamped by metal axial clamping. A washer is used to place the parts on the washer and fix them with glue. If the glue is not firm, the parts will move slightly during the measurement, which will cause deviations in the measurement results. After the measurement is completed, the glue layer needs to be cleaned. The parts and the washer should be soaked in special chemicals, and the glue layer on the surface should be scraped clean with wood chips. This process takes a certain amount of time to clean up. The chemicals also have a certain harmful and pungent smell, so it is not suitable for long-term cleaning. The gluing and cleaning process affects the inspection efficiency of such parts.

[0007] On the other hand, each skeleton part needs to be manually glued, clamped, cleaned and positioned in the coordinate system. The three-dimensional coordinate measuring machine picks up the measuring elements and establishes the measurement program. The measuring machine probe detects according to the measurement program. The gluing and cleaning of the parts takes a long time, which limits the inspection efficiency of the parts. It is not suitable for mass production inspection of components and there is a big gap with modern production inspection. Summary of the invention

[0008] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and to propose a detection device for accurately positioning and detecting skeleton parts. Each time the detected part is replaced by the detection device of the present invention, the locked nuts at the left and right ends can be loosened to replace the detected skeleton part, thereby achieving the effect of quickly replacing the detected part.

[0009] The solution of the present invention is:

[0010] A detection device for accurately positioning and detecting skeleton parts, comprising a part detection support column, a positioning and locking support column, a locking block, a support nail, a locking nut, a three-jaw chuck, a three-jaw positioning bolt and a three-coordinate measuring machine plate;

[0011] The three-claw positioning bolt is threadedly connected and fixed with the fixed threaded hole on the coordinate measuring machine plate;

[0012] The part detection support column is the basis for the installation and positioning of the parts. The center position of the upper surface of the part detection support column is set to a small step concave hole consistent with the outer diameter of the tested part according to the part positioning requirements. A threaded inner hole is set at 3mm to the left and right of the concave hole, which is threadedly connected and fixed with the positioning locking support column;

[0013] The locking block and the positioning locking support column are clearance-matched;

[0014] The support pin is threadedly connected with the locking nut and is clamped and fixed at the center position of the locking block;

[0015] The locking nut is threadedly connected and fixed to the positioning locking support column;

[0016] The three-jaw chuck relies on its own three-jaw clamping part detection support column to remain fixed;

[0017] The three-jaw positioning bolt passes through the bottom hole of the three-jaw chuck and is threadedly connected and fixed to the CMM plate;

[0018] The CMM plate has multiple mounting holes. The three-jaw chuck is placed on the CMM plate. The external thread of the three-jaw positioning bolt is connected with the thread of the CMM plate to position the three-jaw chuck on the CMM plate.

[0019] Place the skeleton part in the concave hole on the part detection support column, the concave hole on the part detection support column contacts the outer diameter of the skeleton part, the positioning and locking support column and the locking block are matched with each other, the support pin and the locking nut are threadedly connected and fixed, the disc surface at the lower end of the support pin positions and clamps the skeleton part at the center of the cylindrical surface of the part detection support column, use a torque wrench to rotate the locking nuts at both ends so that the support pins give the skeleton part a clamping force, and the skeleton part is clamped and fixed;

[0020] The skeleton parts are inspected sequentially. When replacing parts, you only need to loosen or tighten the locking nuts on both ends to achieve the purpose of quick replacement of parts, quick and accurate positioning, and rapid measurement.

[0021] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the three-coordinate measuring machine plate has fixed threaded holes arranged in a matrix and at equal intervals, and the threaded holes are set to M8 internal threads. Any one of the threaded holes on the three-coordinate measuring machine plate is selected as a positioning hole and threadedly connected to the three-jaw positioning bolt to ensure the position of the three-jaw chuck on the three-coordinate measuring machine plate.

[0022] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the three-jaw positioning bolt is connected and fixed to the threaded hole of the three-coordinate measuring machine plate through the bottom thread; the three-jaw positioning bolt structure is a cylindrical bolt with an external thread at the bottom, and the number is preferably one, so as to realize the position positioning of the three-jaw chuck on the three-coordinate measuring machine plate.

[0023] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, three clamping jaws with equal spacing are arranged on the three-jaw chuck, and the centering accuracy requirement of the three clamping jaws is: the concentricity requirement is not greater than 0.05mm, and the verticality requirement of the clamping axis after the three clamping jaws are tightened is: not greater than 0.05mm.

[0024] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the number of the locking nuts is preferably greater than 3, of which 2 are threadedly connected and fixed to the positioning and locking support columns, and 1 is threadedly connected and fixed to the support pin; the locking nut is configured as a hexagonal nut, and the inner thread of the locking nut is configured to be consistent with the threads of the positioning and locking support column and the support pin.

[0025] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the support pin is threadedly connected to the locking nut at the center of the locking block, the number is preferably 1, and the support pin structure is arranged as an upper and lower structure, the upper end is axially provided with an M2.5 external thread, which is threadedly connected to the locking nut and fixed at the center of the locking block, and the lower layer is axially provided with a Φ9mm disk surface with a thickness of 1mm; the purpose is that the disk surface presses against the bottom surface of the skeleton part to clamp the part; after clamping, it is ensured that the end face of the part is connected to the locking block to position and lock the left and right end faces of the support column to ensure that the skeleton part is not subjected to clamping pressure and the part is not deformed.

[0026] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the through holes at both ends of the locking block are matched with the clearance of the positioning locking support column, and the matching clearance is controlled to be no more than 0.1mm, and the number is preferably 1; the locking block structure is set as a long strip structure, the locking block width is 3.2mm, two Φ2.6mm through holes are set at both ends of the locking block, and a Φ2.6mm through hole is set in the middle position. The support nail passes through the through hole here and is threadedly connected and fixed with the locking nut; the through holes at both ends of the locking block pass through the external thread of the locking support column, and the supporting disc surface of the support nail in the middle position contacts with the bottom surface of the skeleton part, ensuring that the locking block can be smoothly compacted and the skeleton parts can be smoothly replaced.

[0027] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the positioning locking support column is threadedly connected and fixed to the part detection support column, the number is preferably 2, and the positioning locking support column structure is set to a three-part structure, the upper and lower parts are M2.5 long cylindrical external threads, and the middle is a Φ3.2mm cylindrical shaft. The locking support column relies on the upper end face of the Φ3.2mm cylindrical shaft to press against the lower end face of the locking block to ensure that there is a 0.05-0.1mm gap between the lower end face of the locking block and the end face of the skeleton part to be measured; rotate the locking nuts at the left and right ends so that the support nails give the skeleton parts a certain clamping force to clamp the skeleton parts.

[0028] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the raw material of the skeleton part to be detected is aluminum alloy material, and the external structure is a thin-walled part. The thickness of the inner and outer walls of the part is 0.1mm, and the cylindricity and coaxiality are 0.01mm. It is a small thin-walled part with poor structural strength and rigidity.

[0029] In the above-mentioned detection device for accurately positioning and detecting skeleton parts, the small recessed hole in the middle position of the part detection support column is placed in the skeleton part to be detected, and the positioning and locking support column and the locking block are gap-matched; the support pin is threadedly connected and fixed with the locking nut, and the disc surface at the lower end of the support pin positions and clamps the skeleton part at the center position of the cylindrical surface of the part detection support column. A torque wrench is used to rotate the locking nuts at the left and right ends so that the support pin applies clamping force to the skeleton part, and the skeleton part is clamped and fixed, thereby achieving the purpose of quick and accurate positioning, clamping, and rapid measurement in one time.

[0030] The beneficial effects of the present invention compared with the prior art are:

[0031] (1) The present invention improves the clamping method of parts, and improves the glue coating clamping to the detection device clamping;

[0032] (2) The present invention reduces the time for gluing and clamping parts, aligning and adjusting, and cleaning the glue layer of parts, and achieves accurate positioning and clamping of parts in one step;

[0033] (3) The present invention quantifies the clamping force applied to the skeleton parts by using a torque wrench;

[0034] (4) The present invention saves labor costs and can realize "one-click" detection of skeleton parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the detection device of the present invention;

[0036] Figure 2 It is a schematic diagram of a parts detection support column of the present invention;

[0037] Figure 3 It is a schematic diagram of a positioning and locking support column of the present invention;

[0038] Figure 4 It is a schematic diagram of the locking block of the present invention;

[0039] Figure 5 It is a schematic diagram of the support nail of the present invention;

[0040] Figure 6 It is a schematic diagram of the locking nut of the present invention;

[0041] Figure 7 It is a schematic diagram of a three-jaw chuck of the present invention;

[0042] Figure 8 It is a schematic diagram of a three-claw positioning bolt of the present invention;

[0043] Fig. 9 It is a schematic diagram of the three-coordinate measuring machine plate of the present invention. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the embodiments.

[0045] The present invention provides a detection device for accurately positioning and detecting skeleton parts. Each time the detection device replaces the detected part, the locking nuts at the left and right ends can be loosened to replace the detected skeleton part, which can achieve the effect of quickly replacing the detected part. The present invention can effectively reduce the time for part alignment, clamping and repeated execution of the coordinate system process. While clarifying the clamping method, it reduces the detection preparation and cleaning time of the skeleton parts, quantifies the clamping force of the parts, saves labor costs and improves the detection efficiency of the parts.

[0046] Detection device for accurate positioning and detection of skeleton parts, such as Figure 1 As shown, it specifically includes a part detection support column 1, a positioning and locking support column 2, a locking block 3, a support pin 4, a locking nut 5, a three-jaw chuck 6, a three-jaw positioning bolt 7 and a three-coordinate measuring machine plate 8.

[0047] The three-jaw positioning bolt 7 is threadedly connected and fixed with the fixed threaded hole on the three-dimensional coordinate measuring machine plate 8; the part detection support column 1 is the installation and positioning basis of the part. The center position of the upper surface of the part detection support column 1 is set to a small step concave hole consistent with the outer diameter of the measured part according to the part positioning requirements. A threaded inner hole is set at 3mm to the left and right of the concave hole, which is threadedly connected and fixed with the positioning locking support column 2; the locking block 3 is clearance-matched with the positioning locking support column 2; the support nail 4 is threadedly connected with the locking nut 5 and clamped and fixed at the center position of the locking block 3; the locking nut 5 is threadedly connected and fixed with the positioning locking support column 2; the three-jaw chuck 6 relies on its own three-jaw clamping of the part detection support column 1 to remain fixed; the three-jaw positioning bolt 7 passes through the bottom hole of the three-jaw chuck 6 and is threadedly connected and fixed with the three-coordinate measuring machine plate 8; the three-coordinate measuring machine plate 8 has a plurality of mounting holes, the three-jaw chuck 6 is placed on the three-coordinate measuring machine plate 8, and the external thread of the three-jaw positioning bolt 7 is threadedly connected with the three-coordinate measuring machine plate 8 to enable the three-jaw chuck 6 to be positioned on the three-coordinate measuring machine plate 8.

[0048] Place the skeleton part in the concave hole on the part detection support column 1, the concave hole on the part detection support column 1 contacts the outer diameter of the skeleton part, the positioning and locking support column 2 and the locking block 3 are clearance-matched, the support pin 4 and the locking nut 5 are threadedly connected and fixed, the disc surface at the lower end of the support pin 4 positions and clamps the skeleton part at the center of the cylindrical surface of the part detection support column 1, use a torque wrench to rotate the locking nuts 5 at both ends so that the support pin 4 gives clamping force to the skeleton part, and clamps and fixes the skeleton part; inspect the skeleton parts sequentially, and when replacing parts, you only need to loosen and tighten the locking nuts 5 at both ends to achieve the purpose of fast replacement of parts, quick and accurate positioning, and fast measurement.

[0049] On the one hand, the present invention improves the clamping method of the skeleton parts to achieve one-time precise positioning and clamping; on the other hand, the traditional detection method is improved by making the part locking support column and the locking block to match the clearance, and at the same time to match the locking nut thread, the support nail is threadedly connected and fixed with the locking nut, the support nail positions and clamps the skeleton parts at the center of the cylindrical surface of the part detection support column, and a torque wrench is used to give the locking nut a clamping force of 1N so that the skeleton parts are clamped. The part detection support column is grasped by the three clamping claws of the three-jaw chuck and the position is fixed. The positioning stud is threadedly connected to the three-coordinate measuring machine plate to determine the spatial position of the detection support column on the three-coordinate measuring machine plate. Each time the detection device replaces a part, the torque wrench is used to loosen the locking nuts on the left and right ends, the locking block is removed, and the skeleton part is taken out to achieve the effect of rapid part replacement and detection.

[0050] The coordinate measuring machine plate 8 has fixed threaded holes arranged in a matrix with equal spacing. The threaded holes are set as M8 internal threads. Any one of the threaded holes on the coordinate measuring machine plate 8 is selected as a positioning hole to be threadedly connected with the three-jaw positioning bolt 7 to ensure the position of the three-jaw chuck 6 on the coordinate measuring machine plate 8. The three-jaw positioning bolt 7 is connected and fixed to the threaded hole of the coordinate measuring machine plate 8 through the bottom thread; the three-jaw positioning bolt 7 is a cylindrical bolt with an external thread at the bottom, and the number is preferably 1, so as to realize the position positioning of the three-jaw chuck 6 on the coordinate measuring machine plate 8.

[0051] The three-jaw chuck 6 is provided with three clamping jaws with equal spacing. The centering accuracy requirement of the three clamping jaws is: the concentricity requirement is not greater than 0.05mm. After the three clamping jaws are tightened, the verticality requirement of the clamping axis is: not greater than 0.05mm.

[0052] The number of locking nuts 5 is preferably 3, two of which are threadedly connected and fixed to the positioning locking support column 2, and one is threadedly connected and fixed to the support nail 4; the outer shape of the locking nut 5 is set to be a hexagonal nut, and the internal thread of the locking nut 5 is set to be consistent with the thread of the positioning locking support column 2 and the support nail 4.

[0053] The support pin 4 is threadedly connected to the locking nut 5 at the center position of the locking block 3, and the number is preferably 1. The support pin 4 is arranged as an upper and lower structure. The upper end is provided with an M2.5 external thread along the axial direction, which is threadedly connected to the locking nut 5 and fixed at the center position of the locking block 3. The lower layer is provided with a Φ9mm disk surface along the axial direction with a thickness of 1mm; the purpose is that the disk surface presses against the bottom surface of the skeleton part to clamp the part; after clamping, it is ensured that the end face of the part is connected to the locking block 3 to position the locking support column 2, and there is a 0.05-0.1mm gap between the left and right end faces to ensure that the skeleton part is not subjected to clamping pressure during clamping and the part is not deformed.

[0054] The through holes at both ends of the locking block 3 are clearance-matched with the positioning locking support column 2, and the clearance is controlled to be no more than 0.1mm, and the number is preferably 1; the locking block 3 is structured as a long strip structure, the locking block 3 is 3.2mm wide, two Φ2.6mm through holes are set at both ends of the locking block 3, and a Φ2.6mm through hole is set in the middle position, and the support nail 4 passes through the through hole here and is threadedly connected and fixed with the locking nut 5; the through holes at both ends of the locking block 3 pass through the external thread of the locking support column, and the supporting disc surface of the support nail 4 in the middle position contacts with the bottom surface of the skeleton part, ensuring that the locking block 3 can be smoothly compacted and the skeleton parts can be smoothly replaced.

[0055] The positioning and locking support column 2 is threadedly connected and fixed to the part detection support column 1, and the number is preferably 2. The positioning and locking support column 2 structure is set as a three-part structure. The upper and lower parts are M2.5 long cylindrical external threads, and the middle is a Φ3.2mm cylindrical shaft. The locking support column relies on the upper end face of the Φ3.2mm cylindrical shaft to press against the lower end face of the locking block 3 to ensure that there is a 0.05-0.1mm gap between the lower end face of the locking block 3 and the end face of the skeleton part to be measured; rotate the locking nuts 5 at the left and right ends so that the support nails 4 give the skeleton parts a certain clamping force to clamp the skeleton parts.

[0056] The raw material of the skeleton part under test is aluminum alloy, and the external structure is a thin-walled part. The thickness of the inner and outer walls of the part is 0.1mm, and the cylindricity and coaxiality are 0.01mm. It is a small thin-walled part with poor structural strength and rigidity.

[0057] The skeleton part to be tested is placed in the small concave hole in the middle of the part detection support column 1, and the positioning and locking support column 2 is clearance-matched with the locking block 3; the support nail 4 is threadedly connected and fixed with the locking nut 5, and the disc surface at the lower end of the support nail 4 positions and clamps the skeleton part at the center of the cylindrical surface of the part detection support column 1. Use a torque wrench to rotate the locking nuts 5 at the left and right ends so that the support nail 4 gives clamping force to the skeleton part, and the skeleton part is clamped and fixed, so as to achieve the purpose of quick and accurate positioning and clamping and rapid measurement in one time.

[0058] like Figure 2 As shown, the part detection support column is the basis for the installation and positioning of the part. The center position of the upper surface of the part detection support column is set to a small step recessed hole consistent with the outer diameter of the measured part according to the part positioning requirements. The depth of the small step recessed hole is 0.3mm, and the flatness of the small step recessed hole is 0.003mm. M2.5 internal threads are set at 3mm to the left and right of the recessed hole, and the number is preferably more than 2 to achieve threaded connection and fixation with the positioning locking support column.

[0059] like Figure 3As shown, the positioning locking support column is threadedly connected and fixed with the part detection support column, and the number is preferably 2. The positioning locking support column structure is set as a three-part structure, the upper and lower parts are M2.5 long cylindrical external threads, and the middle is a Φ3.2mm cylindrical shaft. The locking support column relies on the upper end face of the Φ3.2mm cylindrical shaft to press against the lower end face of the locking block to ensure that there is a 0.05-0.1mm gap between the lower end face of the locking block and the end face of the skeleton part to be tested. Turn the locking nuts at the left and right ends so that the support nails give the skeleton parts a certain clamping force to clamp the skeleton parts.

[0060] like Figure 4 As shown, the through holes at both ends of the locking block are matched with the positioning locking support column, and the matching clearance is controlled to be no more than 0.1mm, and the number is preferably 1. The locking block structure is set as a long strip structure, the locking block width is 3.2mm, two Φ2.6mm through holes are set at both ends of the locking block, and a Φ2.6mm through hole is set in the middle position. The support nail passes through the through hole here and is threadedly connected and fixed with the locking nut. The through holes at both ends of the locking block pass through the external threads of the locking support column. After the supporting cylindrical disk set by the support nail in the middle position contacts the bottom surface of the skeleton part, it ensures that the locking block is smoothly compacted and the skeleton parts are smoothly replaced.

[0061] like Figure 5 As shown, the support pin is threadedly connected to the locking nut at the center of the locking block, and the number is preferably 1. The support pin structure is set as an upper and lower structure. The upper end is provided with an M2.5 external thread along the axial direction, which is threadedly connected to the locking nut and fixed at the center of the locking block. The lower layer is provided with a Φ9mm disc surface along the axial direction, with a thickness of 1mm. Effect The disc surface supports the bottom surface of the skeleton part to clamp the part. After clamping, ensure that there is a 0.05-0.1mm gap between the end face of the part and the left and right end faces of the locking support column connected to the locking block, to ensure that the skeleton part is clamped without pressure and the part is not deformed.

[0062] like Figure 6 As shown, the locking nut is threadedly connected and fixed with the positioning locking support column, and the number is preferably 3. Two of them are threadedly connected and fixed with the positioning locking support column, and one is threadedly connected and fixed with the support nail. The locking nut is configured as a hexagonal nut, and the internal thread of the locking nut is configured as an M2.5 internal thread consistent with the external thread of the positioning locking support column and the support nail.

[0063] like Figure 7 As shown, the three-jaw chuck is provided with three clamping jaws with equal spacing and degrees, and the centering accuracy requirement of the three clamping jaws is: the concentricity requirement is not greater than 0.05mm, and the verticality requirement of the clamping axis after the three clamping jaws are tightened is: not greater than 0.05mm.

[0064] like Figure 8As shown, the three-jaw positioning bolt is a cylindrical bolt, and the three-jaw positioning bolt is arranged as an upper and lower structure, the upper end is arranged as an inner hexagonal nut structure, and the lower end is arranged as an M8 external thread, and the number is preferably 1. The three-jaw positioning bolt is connected and fixed to the threaded hole of the coordinate measuring machine plate through the thread arranged at the lower end, so as to realize the position positioning of the three-jaw chuck on the coordinate measuring machine plate.

[0065] like Fig. 9 As shown, the CMM plate has fixed threaded holes arranged in a matrix with equal spacing. The threaded holes are set to M8 internal threads. Any one of the threaded holes on the CMM plate is selected as a positioning hole to be threadedly connected to the three-jaw positioning bolt to ensure the position of the three-jaw chuck on the measuring machine plate.

[0066] During the inspection process, the skeleton parts are placed in the small concave hole in the middle of the parts inspection support column, the positioning and locking support column and the locking block are matched, and the torque wrench is used to rotate the locking nuts on both ends so that the support nails can give the skeleton parts a certain clamping force to clamp the parts. The purpose of fast and accurate positioning and clamping and fast measurement is achieved in one time. The detection device is accurate, and the positioning and clamping meet the design requirements.

[0067] After completing the above steps, the part detection support column is used as the positioning reference, and the coordinate measuring machine probe picks up the measurement point and establishes the coordinate system. After the program is compiled, the skeleton parts installed on the part detection support column can be detected, and after the detection is completed, the skeleton parts can be directly replaced without re-establishing the coordinate system, which greatly shortens the detection time.

[0068] The specific detection methods are as follows:

[0069] 1. Use a three-coordinate measuring machine to locate the part detection support column, that is, use the outer diameter of the part detection support column and the top plane of the part detection support column as the reference to establish a coordinate system;

[0070] 2. Set the parameters of the testing device so that the skeleton parts to be tested move to the testing position at a fixed angle and moving speed;

[0071] 3. Write a test program to make the probe detect the size, shape accuracy, position accuracy and other parameters of the skeleton parts according to a fixed path (that is, execute the programming statements according to the written test program). When the skeleton parts are tested, the probe automatically leaves, achieving the purpose of fast and accurate positioning and fast measurement of the skeleton parts. "One-key measurement" detects in sequence until all parts are tested. "One-key measurement" is the command key (CTRL+F9) that comes with the three-dimensional coordinate measuring machine, and there is no need to execute the coordinate system process during the detection process.

[0072] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A detection device for accurately positioning and detecting skeleton parts, characterized in that: It comprises a parts detection support column (1), a positioning and locking support column (2), a locking block (3), a support pin (4), a locking nut (5), a three-jaw chuck (6), a three-jaw positioning bolt (7) and a coordinate measuring machine plate (8); The three-claw positioning bolt (7) is threadedly connected and fixed to the fixed threaded hole on the coordinate measuring machine plate (8); The part detection support column (1) is the installation and positioning basis of the part. The center position of the upper surface of the part detection support column (1) is set to a small step concave hole consistent with the outer diameter of the tested part according to the part positioning requirements. A threaded inner hole is set at 3mm to the left and right of the concave hole, which is threadedly connected and fixed with the positioning locking support column (2); The locking block (3) and the positioning locking support column (2) are clearance-matched; The support pin (4) is threadedly connected to the locking nut (5) and is clamped and fixed at the center position of the locking block (3); The locking nut (5) is threadedly connected and fixed to the positioning locking support column (2); The three-jaw chuck (6) relies on its own three-jaw clamping to keep the parts detection support column (1) fixed; The three-jaw positioning bolt (7) passes through the bottom hole of the three-jaw chuck (6) and is threadedly connected and fixed to the coordinate measuring machine plate (8); The three-coordinate measuring machine plate (8) has a plurality of mounting holes, the three-jaw chuck (6) is placed on the three-coordinate measuring machine plate (8), and the external thread of the three-jaw positioning bolt (7) is threadedly connected with the three-coordinate measuring machine plate (8) so that the three-jaw chuck (6) can be positioned on the three-coordinate measuring machine plate (8); The skeleton part is placed in the concave hole on the part detection support column (1), the concave hole on the part detection support column (1) contacts the outer diameter of the skeleton part, the positioning and locking support column (2) and the locking block (3) are clearance-matched, the support pin (4) and the locking nut (5) are threadedly connected and fixed, the disc surface at the lower end of the support pin (4) positions and clamps the skeleton part at the center position of the cylindrical surface of the part detection support column (1), and a torque wrench is used to rotate the locking nuts (5) at the left and right ends so that the support pin (4) gives the skeleton part a clamping force, thereby clamping and fixing the skeleton part; The skeleton parts are inspected sequentially, and when replacing parts, only the locking nuts (5) at the left and right ends need to be loosened or tightened to achieve the purpose of rapid replacement of parts, rapid and accurate positioning, and rapid measurement. The small concave hole in the middle of the part detection support column (1) is placed in the skeleton part to be tested, and the positioning and locking support column (2) and the locking block (3) are clearance-matched; the support pin (4) and the locking nut (5) are threadedly connected and fixed, and the disc surface at the lower end of the support pin (4) positions and clamps the skeleton part at the center position of the cylindrical surface of the part detection support column (1), and a torque wrench is used to rotate the locking nuts (5) at the left and right ends so that the support pin (4) applies clamping force to the skeleton part, and the skeleton part is clamped and fixed, thereby achieving the purpose of fast and accurate positioning and clamping and fast measurement in one time.

2. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The three-coordinate measuring machine plate (8) is provided with fixed threaded holes arranged in a matrix and at equal intervals, and the threaded holes are set as M8 internal threads. Any one of the threaded holes on the three-coordinate measuring machine plate (8) is selected as a positioning hole and threadedly connected to the three-jaw positioning bolt (7) to ensure the position of the three-jaw chuck (6) on the three-coordinate measuring machine plate (8).

3. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The three-jaw positioning bolt (7) is connected and fixed to the threaded hole of the three-coordinate measuring machine plate (8) through the bottom thread; the three-jaw positioning bolt (7) is a cylindrical bolt with an external thread on the bottom, and the number of the three-jaw positioning bolt (7) is one, so as to realize the position positioning of the three-jaw chuck (6) on the three-coordinate measuring machine plate (8).

4. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The three-jaw chuck (6) is provided with three clamping jaws with equal spacing. The centering accuracy requirement of the three clamping jaws is: the concentricity requirement is not greater than 0.05mm. The verticality requirement of the clamping axis after the three clamping jaws are tightened is: not greater than 0.05mm.

5. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The number of the locking nuts (5) is 3, of which 2 are threadedly connected and fixed to the positioning locking support column (2), and 1 is threadedly connected and fixed to the support pin (4); the locking nut (5) is configured as a hexagonal nut, and the internal thread of the locking nut (5) is configured to be consistent with the threads of the positioning locking support column (2) and the support pin (4).

6. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The support pin (4) is threadedly connected to the locking nut (5) at the center of the locking block (3), and the number of the support pins (4) is 1. The structure of the support pin (4) is set as an upper and lower structure. The upper end is provided with an M2.5 external thread along the axial direction, which is threadedly connected to the locking nut (5) and fixed at the center of the locking block (3). The lower layer is provided with a Φ9mm disc surface along the axial direction, and the thickness is 1mm; the disc surface is used to press against the bottom surface of the skeleton part to clamp the part; after clamping, it is ensured that the end face of the part is connected to the locking block (3) and there is a 0.05-0.1mm gap between the left and right end faces of the locking support column (2) to ensure that the skeleton part is not subjected to clamping pressure during clamping and the part is not deformed.

7. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The through holes at both ends of the locking block (3) are clearance-matched with the positioning locking support column (2), and the clearance is controlled to be no more than 0.1 mm, and the number is 1; the locking block (3) is structured as a long strip structure, the locking block (3) is 3.2 mm wide, two Φ2.6 mm through holes are set at both ends of the locking block (3), and a Φ2.6 mm through hole is set in the middle position, and the support nail (4) passes through the through hole and is threadedly connected and fixed with the locking nut (5); the through holes at both ends of the locking block (3) pass through the external thread of the locking support column, and after the support disc surface of the support nail (4) in the middle position contacts the bottom surface of the skeleton part, it is ensured that the locking block (3) can be smoothly compacted and the skeleton part can be smoothly replaced.

8. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The positioning locking support column (2) is threadedly connected and fixed to the part detection support column (1), and there are two of them. The positioning locking support column (2) is structured as a three-part structure, with the upper and lower parts being M2.5 long cylindrical external threads and the middle being a Φ3.2mm cylindrical shaft. The locking support column relies on the upper end face of the Φ3.2mm cylindrical shaft to press against the lower end face of the locking block (3), ensuring that there is a 0.05-0.1mm gap between the lower end face of the locking block (3) and the end face of the skeleton part to be tested; the locking nuts (5) at the left and right ends are rotated so that the support nails (4) give the skeleton parts a certain clamping force to clamp the skeleton parts.

9. The detection device for accurately positioning and detecting skeleton parts according to claim 1, characterized in that: The raw material of the skeleton part under test is aluminum alloy, and the external structure is a thin-walled part. The thickness of the inner and outer walls of the part is 0.1mm, and the cylindricity and coaxiality are 0.01mm. It is a small thin-walled part with poor structural strength and rigidity.

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