Contour measurement device and method for curved parts

Abstract

This invention discloses a contour detection device and method for curved surface parts in the field of component inspection technology. The contour detection device for curved surface parts includes a worktable and measuring pins. Multiple holes are arranged in a matrix on the worktable for the measuring pins to pass through, and each measuring pin can move up and down within its corresponding hole. The lower end of each measuring pin is hemispherical. Inspection units are provided on the measuring pins. In use, the part to be inspected is located below the worktable, and the lower end of the measuring pin abuts against the part. The corresponding points on the part to be inspected can be detected based on the position of the inspection unit on the measuring pin relative to the worktable. By setting up a worktable and a matrix of measuring pins that can move up and down relative to the worktable, when the part to be inspected is placed below the worktable, the measuring pins abut against the part and move up and down, and the corresponding points on the part to be inspected can be detected based on the inspection units on the measuring pins. This method has the advantages of low cost, balancing detection accuracy and efficiency.

Description

Technical Field

[0001] This invention relates to the field of component inspection technology, specifically to a device and method for detecting the contour of curved surface components. Background Technology

[0002] Currently, the aviation manufacturing industry is developing rapidly, with a wide variety of aircraft products of various types. Many aircraft parts, such as panels, covers, and supports, often have complex shapes and numerous spatial dimensions (such as surface profile, flatness, tilt, coaxiality, etc.), among which surface profile is the most difficult to measure.

[0003] Modern aircraft extensively utilize hyperbolic surfaces (such as titanium alloy tail nozzles, skins, and airfoils), and the precision of the product's shape directly impacts flight performance. Traditional measurement methods, such as comparison with measurement templates and shape mold inspection, require using inspection fixtures to compare the fit with the part's shape, resulting in low inspection efficiency. Furthermore, different measuring fixtures are needed for each curvature change location. The next generation of methods for measuring the spatial dimensions of aircraft parts is digital measurement, such as laser trackers, coordinate measuring machines (CMMs), and robotic measuring arms. These devices all require probes to contact the surface of the aircraft part, with each data acquisition point taking approximately 30 minutes, and the average measurement of a single part taking 2-3 hours. Moreover, digital measurement equipment is relatively expensive, often costing hundreds of thousands to millions of yuan; many are imported, leading to considerable maintenance costs. Additionally, the equipment requires specialized personnel to develop systems and operate it, resulting in high labor costs.

[0004] In summary, the current measurement of the contour of aircraft curved parts faces three major problems: "limitations of complex parts, low measurement efficiency, and poor measurement economy." There is an urgent need to develop a measurement device that is adaptive to curvature, fast and efficient, and compatible with multiple scenarios, so as to meet the needs of rapid inspection of the contour of aircraft curved parts for both first-piece inspection (which requires numerical data) and batch inspection (which requires conformity data). Summary of the Invention

[0005] This invention provides a device for detecting the contour of curved parts, thereby reducing costs and improving measurement efficiency.

[0006] The technical solution adopted by this invention to solve its technical problem is: The contour inspection device for curved surface parts includes a worktable and measuring pins. The worktable has multiple holes arranged in a matrix for the measuring pins to pass through, and each measuring pin can move up and down within its corresponding hole. The lower end of the measuring pin is a hemisphere. The measuring pin is equipped with an inspection unit. In use, the part to be inspected is located below the worktable, and the lower end of the measuring pin abuts against the part to be inspected. The corresponding point of the part to be inspected can be inspected according to the position of the inspection unit on the measuring pin relative to the worktable.

[0007] In this application, by setting up a worktable and a matrix of measuring pins that can move up and down relative to the worktable, when the part to be inspected is placed under the worktable, the measuring pins abut against the part and move up and down. The corresponding points of the part to be inspected can be inspected according to the inspection units on the measuring pins. This has the advantages of low cost and a good balance between inspection accuracy and inspection efficiency.

[0008] In some embodiments, the inspection unit is a color mark set on the upper end of the measuring pin. When in use, the part to be inspected is located below the worktable, and the lower end of the measuring pin abuts against the part to be inspected. Inspection can be performed according to the position of the color mark on the upper end of the measuring pin relative to the worktable.

[0009] In some embodiments, the inspection unit is a size scale set on the upper end of the measuring pin. In use, the part to be inspected is located below the worktable, and the lower end of the measuring pin abuts against the part to be inspected. Inspection can be performed according to the position of the size scale on the upper end of the measuring pin relative to the worktable.

[0010] In some embodiments, the inspection unit consists of an upper limit sensor and a lower limit sensor mounted on a measuring pin. In use, the part to be inspected is located below the worktable, and the lower end of the measuring pin abuts against the part to be inspected. Inspection can be performed based on whether the upper limit sensor and the lower limit sensor are blocked by the worktable.

[0011] In some embodiments, a limiting plate is also included. The worktable has a hollow structure, the limiting plate is located inside the worktable, and corresponding holes are provided for the measuring pin to pass through. The limiting plate can move horizontally relative to the worktable so that the limiting plate can abut against the measuring pin to restrict the up and down movement of the measuring pin.

[0012] In some embodiments, the limiting plate can move horizontally and linearly relative to the worktable. Grooves are provided on both sides of the middle section of the measuring pin to form two opposing planes. The two planes are perpendicular to the direction of linear movement of the limiting plate relative to the worktable.

[0013] In some embodiments, at least one component of the limiting plate or the worktable has a boss at the hole through which the measuring pin passes. The boss is adapted to the grooves opened on both sides of the middle section of the measuring pin to limit the vertical movement of the measuring pin relative to the worktable and to limit the rotation of the measuring pin relative to the worktable.

[0014] In some embodiments, along the horizontal linear motion direction of the limiting plate relative to the worktable, a through hole is provided on the worktable for the traction member to pass through. One end of the traction member located inside the worktable is connected to the limiting plate, so that the other end of the traction member located outside the worktable is subjected to force, which can drive the limiting plate to move horizontally relative to the worktable.

[0015] In some embodiments, the traction component is an adjusting bolt, which is threaded into a through hole on the worktable. A connector is fixedly installed on the limiting plate. The connector has a spherical inner cavity. One end of the adjusting bolt located inside the worktable is spherical and is adapted to the inner cavity of the connector, so that by rotating the adjusting bolt, the limiting plate can be driven to move horizontally and linearly relative to the worktable.

[0016] The present invention also provides a method for detecting the contour of curved surface parts, used in the aforementioned device for detecting the contour of curved surface parts, comprising the following steps: S1. Place the worktable above the part to be inspected, and use a measuring pin to press against the part to be inspected, so that the measuring pin moves upward relative to the worktable; S2. The corresponding points of the part to be inspected are inspected by measuring the position of the inspection unit on the pin relative to the worktable; If the testing device also includes a limit plate, the test results can still be viewed after the part to be tested is removed by moving the limit plate to abut against the measuring pin in S2. If the inspection unit consists of an upper limit sensor, a lower limit sensor, and a color-coded indicator, in S2, the corresponding point can be inspected to check whether it conforms to the size range by checking the position of the inspection unit relative to the worktable. If the inspection unit is a dimensional scale, the dimensional value of the corresponding point can be obtained in S2 by the position of the inspection unit relative to the worktable.

[0017] The beneficial effects of this invention are: By setting up a worktable and matrix-distributed measuring pins that can move up and down relative to the worktable, when the part to be inspected is placed under the worktable, the measuring pins abut against the part and move up and down. The corresponding points of the part to be inspected can be inspected according to the inspection units on the measuring pins. This method has the advantages of low cost, while taking into account both inspection accuracy and inspection efficiency. Attached Figure Description

[0018] Figure 1 A schematic diagram of the contour detection device for curved surface parts provided by the present invention; Figure 2 for Figure 1 Top view of a device for detecting the contour of curved surface parts; Figure 3 for Figure 1 Schematic diagram of the structure of the middle workbench; Figure 4 for Figure 3 Top view of the middle workbench; Figure 5 for Figure 4 A magnified view of a portion of the image; Figure 6 for Figure 1 Schematic diagram of the middle limit plate; Figure 7 for Figure 6 Top view of the middle limit plate; Figure 8 for Figure 7 A magnified view of a portion of the image; Figure 9 This is a schematic diagram of the measuring pin structure in this embodiment; Figure 10 This is a schematic diagram of the measuring pin in another embodiment; Figure 11 This is a schematic diagram of the structure of the part limiting pin in this embodiment; Figure 12 This is a schematic diagram of the connector structure in this embodiment.

[0019] The markings in the diagram are as follows: 1-Workbench; 11-Through hole; 2-Measuring pin; 3-Limit plate; 4-Adjusting bolt; 5-Connector; 51-Inner cavity; 6-Boss; 7-Color mark; 8-Dimension scale; 9-Part limit pin. Detailed Implementation

[0020] The invention will be further described below with reference to the accompanying drawings.

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figures 1-11 As shown, the present invention provides a device and method for detecting the contour of curved parts.

[0023] Combination Figures 1-5 As shown, the contour detection device for curved surface parts includes a worktable 1 and measuring pins 2. The worktable 1 has multiple holes arranged in a matrix for the measuring pins 2 to pass through, and each measuring pin 2 can move up and down within the corresponding hole. The lower end of the measuring pin 2 is a hemisphere. The measuring pin 2 is equipped with an inspection unit. In use, the part to be inspected is located below the worktable 1, and the lower end of the measuring pin 2 abuts against the part to be inspected. The corresponding point of the part to be inspected can be detected according to the position of the inspection unit on the measuring pin 2 relative to the worktable 1.

[0024] In this application, by setting up a workbench 1 and a matrix of measuring pins 2 that can move up and down relative to the workbench 1, when the part to be inspected is placed under the workbench 1, the measuring pins 2 abut against the part and move up and down. The corresponding points of the part to be inspected can be inspected according to the inspection unit on the measuring pins 2. This has the advantages of low cost and a good balance between inspection accuracy and inspection efficiency.

[0025] By measuring the lower end of pin 2 as a hemisphere to improve measurement accuracy, and combining multi-point simultaneous detection, this device can detect different curved surface contours, which is economical and balances measurement accuracy and efficiency.

[0026] Combination Figures 6-8 As shown, in this embodiment, a limiting plate 3 is also included. The worktable 1 has a hollow structure. The limiting plate 3 is located inside the worktable 1 and has corresponding holes for the measuring pin 2 to pass through. The limiting plate 3 can move horizontally relative to the worktable 1 so that the limiting plate 3 can abut against the measuring pin 2 to restrict the up and down movement of the measuring pin 2.

[0027] In this embodiment, the limiting plate 3 can move horizontally and linearly relative to the worktable 1. The measuring pin 2 has grooves on both sides of the middle section to form two opposing planes. The two planes are perpendicular to the linear movement direction of the limiting plate 3 relative to the worktable 1.

[0028] As set up above, the slots on both sides facilitate the effective contact and limiting of the measuring pin 2 by the limiting plate 3.

[0029] Furthermore, at least one component of the limiting plate 3 or the worktable 1 is provided with a boss 6 at the hole through which the measuring pin 2 passes. The size of the boss 6 is adapted to the grooves opened on both sides of the middle section of the measuring pin 2 to limit the up and down movement of the measuring pin 2 relative to the worktable 1, and to limit the rotation of the measuring pin 2 relative to the worktable 1.

[0030] Referring to the illustration, in this embodiment, both the limiting plate 3 and the worktable 1 are provided with protrusions 6.

[0031] The boss 6 here cooperates with the slots on both sides of the measuring pin 2. Firstly, it restricts the up and down movement of the measuring pin 2 by stepping on the surface, and secondly, it restricts the rotation of the measuring pin 2 by abutting against the slot.

[0032] In this embodiment, along the horizontal linear motion direction of the limiting plate 3 relative to the worktable 1, a through hole 11 is provided on the worktable 1 for the traction member to pass through. One end of the traction member located inside the worktable 1 is connected to the limiting plate 3, so that the other end of the traction member located outside the worktable 1 is subjected to force, which can drive the limiting plate 3 to move horizontally relative to the worktable 1.

[0033] Furthermore, the traction component is an adjusting bolt 4, which is threaded into a through hole 11 on the worktable 1. A connector 5 is fixedly installed on the limiting plate 3. The connector 5 has a spherical inner cavity 51. One end of the adjusting bolt 4 located inside the worktable 1 is spherical and is adapted to the inner cavity 51 of the connector 5, so that by rotating the adjusting bolt 4, the limiting plate 3 can be driven to move horizontally and linearly relative to the worktable 1.

[0034] The adjusting bolt 4 is divided into three parts: the bolt head, the bolt thread, and the bolt tail. The bolt head is a protruding "I" shape for easy manual rotation; the middle of the bolt has an external thread, and the through hole 11 on the right side of the worktable 1 has a corresponding internal thread. The middle of the bolt engages with the through hole 11 on the right side of the worktable 1, and rotating it causes the adjusting bolt 4 to move left and right; the bolt tail is spherical and engages with the connector 5 on the limiting plate 3. It is enclosed by the spherical inner cavity 51 on the connector 5, so that rotating the adjusting bolt 4 can drive the limiting plate 3 to move left and right, thereby achieving the contact and release of the measuring pin 2.

[0035] Combination Figure 12 As shown, the left end of connector 5 is threaded and screws into the limiting plate 3, while the other end has a 3 / 4 hollow spherical cavity 51, which is used to fit the tail ball of the connecting adjusting bolt 4.

[0036] Referring to the diagram, the workbench 1 is a hollow cuboid structure. The vertical space of the hollow layer (the height is about 10cm) is just enough to accommodate the lower limit plate 3, so that the limit plate 3 cannot move up and down. The space in the left and right directions allows the limit plate 3 to move 1-2mm, which is used for measuring pin 2 to limit. The right side of the workbench 1 is provided with a threaded hole for installing the adjusting bolt 4.

[0037] The limiting plate 3 has a rectangular structure with a height of approximately 10cm. It is slightly shorter than the internal cavity of the worktable 1 in the left-right direction. Both the worktable 1 and the limiting plate 3 have holes arranged in a matrix for the measuring pin 2 to pass through. The holes on the limiting plate 3 and the worktable 1 are spaced at the same distance. The corresponding holes on the two components are coaxial, and the diameter of the holes and the size of the boss 6 on the limiting plate 3 are slightly larger than those on the worktable 1.

[0038] Reference Figure 9 As shown, the inspection unit is a color mark 7 set on the upper end of the measuring pin 2. When in use, the part to be inspected is located below the workbench 1, and the lower end of the measuring pin 2 abuts against the part to be inspected. The inspection can be carried out according to the position of the color mark 7 on the upper end of the measuring pin 2 relative to the workbench 1.

[0039] In this embodiment, the measuring pin 2 is cylindrical in shape and divided into three sections. The lower section is the part measurement contact end, with a hemispherical head. The middle section is the fixing and limiting end of the measuring pin 2, with a slot on each side in the axial direction, which cooperates with the worktable 1 to limit the maximum axial movement of the measuring pin 2. The upper section is the measurement result display end, which is divided into three sections: section A (under test), section B (indicating a qualified profile during testing), and section C (indicating an out-of-tolerance profile during measurement). The three sections of the display end can be distinguished by color, such as gray for section A, green for section B, and red for section C. The start and end positions and lengths of the three sections A, B, and C are determined by the surface profile of the part to be tested and the position of the measuring pin 2 on the worktable 1.

[0040] Reference Figure 10 As shown, in some embodiments, the inspection unit is a size scale 8 set on the upper end of the measuring pin 2. When in use, the part to be inspected is located below the worktable 1, and the lower end of the measuring pin 2 abuts against the part to be inspected. Inspection can be performed according to the position of the size scale 8 on the upper end of the measuring pin 2 relative to the worktable 1.

[0041] The measuring pin 2 is cylindrical in shape and divided into three sections. The lower section is the part measurement contact end; the middle section is the measuring pin 2 fixing and limiting end, with a slot on each side in the axial direction, which cooperates with the worktable 1 to limit the maximum axial movement of the measuring pin 2; the upper section is the measurement result display end, where the measurement result display end displays numerical labels. By statistically analyzing and calculating the measurement results of the position of the measuring pin 2 and the movement value of the measuring pin 2, the specific surface profile value of the aircraft curved surface part can be measured.

[0042] In some other embodiments, the inspection unit consists of an upper limit sensor and a lower limit sensor mounted on the measuring pin 2. When in use, the part to be inspected is located below the workbench 1, and the lower end of the measuring pin 2 abuts against the part to be inspected. Inspection can be performed based on whether the upper limit sensor and the lower limit sensor are blocked by the workbench 1.

[0043] Based on the position of the workbench 1 and the location of the part to be inspected, upper and lower limit sensors are installed on measuring pin 2 to correspond to the upper and lower limits of the dimensions. Whether the workbench 1 simultaneously blocks both sensors determines whether the dimensions conform to the specifications. A conforming dimension requires that exactly one of the two sensors be blocked. In practice, automated inspection can be achieved through electrical signal feedback between the upper and lower limit sensors, further improving inspection accuracy and efficiency.

[0044] In combination with the above, the three types of measuring pins 2, color markings 7, and sensor setting schemes are used to obtain conforming data, while the size scale 8 setting scheme can obtain numerical data.

[0045] Reference Figure 11 As shown, this embodiment also includes a part limiting pin 9. The part limiting pin 9 is divided into three parts: the lower section is the part contact end, the middle section is the limiting pin fixing end, the middle section has the same thickness as the worktable 1, so that it cannot move after installation and fixing, and the upper section has no actual function. The part limiting pin 9 is cylindrical, and the lower end head is hemispherical. The function of the part limiting pin 9 is to limit the fit between the part to be tested and the worktable 1 during measurement, and to prevent the part from getting too close to the worktable 1, causing the measuring pin 2 to exceed the maximum movement value. In this embodiment, there are 3 part limiting pins 9, evenly distributed around the worktable 1. In practice, the setting position of the limiting pins can be adjusted according to the surface size of the part to be tested.

[0046] The present invention also provides a method for detecting the contour of curved surface parts, used in the aforementioned device for detecting the contour of curved surface parts, comprising the following steps: S1. Place the worktable 1 above the part to be inspected, and use the measuring pin 2 to abut against the part to be inspected, so that the measuring pin 2 moves upward relative to the worktable 1.

[0047] S2. The corresponding points of the part to be inspected are inspected by measuring the position of the inspection unit on pin 2 relative to the worktable 1.

[0048] In practice, the part to be tested is placed on a platform and fixed. Then, the worktable 1 is placed above the aircraft curved surface part to be measured. The part limiting pins 9 and measuring pins 2 on the integrated worktable 1 gradually come into contact with the curved surface area of ​​the aircraft curved surface part to be measured, causing the measuring pins 2 to move until the curved surface area of ​​the aircraft curved surface part to be measured is in complete contact with the three part limiting pins 9. At this time, the adjusting bolts 4 on the limiting plate 3 are manually tightened. After the bolts are turned, they drive the ball connector 5 of the measuring pin 2 limiting plate 3 and the measuring pin 2 limiting plate 3 to move, locking the measuring pin 2 in place and preventing it from moving. The measurement result is judged by observing the inspection unit on the measuring pin 2. In this embodiment, the color of the observation result display end is used. This method is suitable for batch inspection of the contour conformity of large batches of aircraft curved surface parts. It can significantly improve the measurement efficiency of the contour conformity of aircraft curved surface parts and reduce the measurement cost of the contour conformity of aircraft curved surface parts.

[0049] Depending on the inspection unit, if the inspection unit is an upper limit sensor, a lower limit sensor, and a color identifier 7, in step S2, the position of the inspection unit relative to the worktable 1 can be used to check whether the corresponding point conforms to the size range. If the inspection unit is a size scale 8, in step S2, the size value of the corresponding point can be obtained by the position of the inspection unit relative to the worktable 1. When the inspection unit is a size scale 8, the position of the measuring pin 2 relative to the worktable 1 is obtained through the size value. Combined with the curved surface point where the measuring pin 2 is located, the results are statistically analyzed and calculated to obtain the specific surface contour value of the aircraft curved surface part. This allows the rapid measurement fixture of the present invention to obtain numerical measurement results, thereby effectively improving the accuracy and range of measurement to meet the needs of different measurement purposes.

[0050] The distance between the worktable 1 and the part to be inspected is limited to the part limit pin 9, and the worktable 1 can be fixed on a certain platform.

[0051] In summary, the present invention utilizes multi-point measuring pins 2 integrated on the worktable 1 to detect the contour of aircraft curved parts. The contour of the curved surface is detected by observing the inspection unit on the measuring pins 2. It has the advantages of low cost and a good balance between detection accuracy and efficiency.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for detecting the contour of curved surfaces, characterized in that: It includes a worktable (1) and measuring pins (2). The worktable (1) has multiple holes distributed in a matrix for the measuring pins (2) to pass through, and each measuring pin (2) can move up and down in the corresponding hole. The lower end of the measuring pin (2) is a hemisphere. The measuring pin (2) is equipped with an inspection unit. When in use, the part to be inspected is located below the workbench (1), and the lower end of the measuring pin (2) abuts against the part to be inspected. The corresponding point of the part to be inspected can be inspected according to the position of the inspection unit on the measuring pin (2) relative to the workbench (1).

2. The contour detection device for curved surface parts as described in claim 1, characterized in that: The inspection unit is a color mark (7) set on the upper end of the measuring pin (2). When in use, the part to be inspected is located below the workbench (1), and the lower end of the measuring pin (2) abuts against the part to be inspected. The inspection can be carried out according to the position of the color mark (7) on the upper end of the measuring pin (2) relative to the workbench (1).

3. The contour detection device for curved surface parts as described in claim 1, characterized in that: The inspection unit is a size scale (8) set on the upper end of the measuring pin (2). When in use, the part to be inspected is located below the worktable (1), and the lower end of the measuring pin (2) abuts against the part to be inspected. The inspection can be carried out according to the position of the size scale (8) on the upper end of the measuring pin (2) relative to the worktable (1).

4. The contour detection device for curved surface parts as described in claim 1, characterized in that: The inspection unit consists of an upper limit sensor and a lower limit sensor set on the measuring pin (2). When in use, the part to be inspected is located below the workbench (1), and the lower end of the measuring pin (2) abuts against the part to be inspected. The inspection can be carried out based on whether the upper limit sensor and the lower limit sensor are blocked by the workbench (1).

5. The contour detection device for curved surface parts as described in any one of claims 1-4, characterized in that: It also includes a limiting plate (3), the worktable (1) is a hollow structure, the limiting plate (3) is located inside the worktable (1), and corresponding holes are provided for the measuring pin (2) to pass through; The limiting plate (3) can move horizontally relative to the worktable (1), so that the limiting plate (3) can abut against the measuring pin (2) to restrict the up and down movement of the measuring pin (2).

6. The contour detection device for curved surface parts as described in claim 5, characterized in that: The limiting plate (3) can move horizontally and linearly relative to the worktable (1). The measuring pin (2) has grooves on both sides of the middle section to form two opposing planes. The two planes are perpendicular to the direction of linear movement of the limiting plate (3) relative to the worktable (1).

7. The contour detection device for curved surface parts as described in claim 6, characterized in that: At least one component of the limiting plate (3) or the worktable (1) is provided with a boss (6) at the hole through which the measuring pin (2) passes. The size of the boss (6) is adapted to the grooves opened on both sides of the middle section of the measuring pin (2) to limit the up and down movement of the measuring pin (2) relative to the worktable (1) and to limit the rotation of the measuring pin (2) relative to the worktable (1).

8. The contour detection device for curved surface parts as described in claim 6, characterized in that: Along the horizontal linear motion direction of the limiting plate (3) relative to the worktable (1), the worktable (1) has a through hole (11) for the traction component to pass through. One end of the traction component located inside the worktable (1) is connected to the limiting plate (3), so that the other end of the traction component located outside the worktable (1) is subjected to force, which can drive the limiting plate (3) to move horizontally relative to the worktable (1).

9. The contour detection device for curved surface parts as described in claim 8, characterized in that: traction... The component is an adjusting bolt (4), which is threaded into a through hole (11) on the worktable (1). A connector (5) is fixedly installed on the limiting plate (3). The connector (5) has a spherical inner cavity (51). One end of the adjusting bolt (4) located inside the worktable (1) is spherical and is adapted to the inner cavity (51) of the connector (5), so that by rotating the adjusting bolt (4), the limiting plate (3) can be driven to move horizontally and linearly relative to the worktable (1).

10. A method for detecting the contour of curved surface parts, characterized by: The device for detecting the contour of curved parts as described in claim 1 comprises the following steps: S1. Place the worktable (1) above the part to be inspected, and use the measuring pin (2) to abut against the part to be inspected, so that the measuring pin (2) moves upward relative to the worktable (1); S2. The corresponding point of the part to be inspected is inspected by measuring the position of the inspection unit on the pin (2) relative to the worktable (1); If the detection device also includes a limiting plate (3), the detection results can still be viewed after the part to be detected is removed by moving the limiting plate (3) to abut against the measuring pin (2) in S2; If the inspection unit is an upper limit sensor and a lower limit sensor, and a color mark (7), in S2, the corresponding point can be inspected to see if it conforms to the size range by checking the position of the inspection unit relative to the worktable (1); If the inspection unit is a size scale (8), the size value of the corresponding point can be obtained in S2 by the position of the inspection unit relative to the worktable (1).

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