Self-centering rapid inspection tool for key features of cast parts based on circular datum

Abstract

This utility model relates to a self-centering rapid inspection tool for key features of cast parts based on a circular datum, and pertains to the field of cast parts inspection. The technical solution includes a self-centering assembly for restricting the X, Y, and Z degrees of freedom of the cast part; a rotational positioning assembly for restricting the rotational degree of freedom of the cast part; a mistake-proofing assembly, distributed according to the shape of the cast part, for constraining the clamping posture and direction of the cast part; and an inspection assembly for determining whether the position of the key features of the cast part conforms to the drawing requirements. In this case, positioning the center datum of the cast part using the self-centering assembly achieves a positioning accuracy far superior to that of ordinary cylindrical pins. Simultaneously, it can fix the cast part, avoiding deformation caused by other clamping methods that affect inspection accuracy, making it suitable for large-scale rapid inspection.

Description

Technical Field

[0001] This utility model relates to the field of casting parts inspection technology, and in particular to a self-centering rapid inspection tool for key features of casting parts based on a circular reference. Background Technology

[0002] For the key features of complex cast parts with circular reference datum, existing inspection methods mainly rely on scanning inspection and coordinate measuring machine (CMM). However, these methods have significant drawbacks. A single inspection requires multiple cumbersome processes, such as equipment debugging, part clamping, and data acquisition, which are time-consuming and difficult to adapt to the rapid quality inspection needs of batch parts. In addition, the inspection process requires high professional skills from operators, which not only increases the cost of human resources training but also easily introduces additional errors due to differences in operation. Furthermore, the equipment has high occupancy rate, high energy consumption, and low resource utilization. More importantly, the parts need to be fixed at a specific station during inspection. If dimensional deviations are found, the process of adjusting the position of the parts or reclamping them is complicated and cannot achieve efficient correction.

[0003] In terms of fixture design, existing solutions also have shortcomings. Due to the characteristics of the casting process, complex cast parts are prone to problems such as slight deformation, dimensional fluctuations, or uneven casting allowances on their surfaces. Conventional fixtures generally use cylindrical pins for positioning, but the fit between the positioning surface and the part's datum surface is poor, which cannot adapt to the casting errors of the parts and makes it difficult to form a stable positioning datum, resulting in a significant decrease in positioning accuracy. This positioning deviation will be directly transmitted to subsequent inspection stages, causing the inspection data of key features of the parts to deviate from the actual dimensions, ultimately resulting in a large inspection error. Summary of the Invention

[0004] The purpose of this invention is to provide a self-centering rapid inspection tool for key features of cast parts based on a circular reference, in order to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A self-centering rapid inspection tool for key features of cast parts based on a circular datum, comprising: The base plate has a support part at its bottom for supporting the inspection tool; A self-centering assembly is disposed on the base plate and located in the middle of the base plate, and is used to restrict the X, Y and Z degrees of freedom of the cast parts; A rotational positioning component is disposed on the base plate and located on one side of the self-centering component, which is used to restrict the rotational degree of freedom of the cast parts; A foolproof component, disposed on the base plate and distributed around the outer periphery of the self-centering component, is arranged according to the shape of the cast part and is used to constrain the clamping posture and clamping direction of the cast part; and The detection component is disposed on the base plate and located on one side of the self-centering component, and is used to determine whether the position of the key features of the cast parts conforms to the drawing requirements. When the cast parts are under inspection, it is necessary to ensure that the self-centering component, the rotation positioning component, and the foolproof component have all completed the restriction of their degrees of freedom, as well as the constraint of their clamping posture and clamping direction.

[0006] In some embodiments, the self-centering component includes: The main body is located in the middle of the base plate, and a cover plate is installed on it. There is a gap between the cover plate and the main body. The cover plate has a through central hole. The upper part of the main body has a guide hole that is coaxial with and communicates with the central hole of the cover plate. The lower part of the main body has a threaded hole that is coaxial with and communicates with the guide hole. A drive wedge is fitted onto a lever drive screw and can slide up and down along the guide hole. The top end of the lever drive screw is located above the cover plate, and the bottom end of the lever drive screw is threadedly connected to the threaded hole at the bottom of the main body. A first wedge-shaped positioning block, a second wedge-shaped positioning block, and a third wedge-shaped positioning block are slidably disposed in the gap between the cover plate and the main body. They are arranged radially along the main body and evenly spaced about the central axis of the main body. The outer side of one end of each wedge-shaped positioning block inside the main body is inclined and adapted to the inclined surface of the driving wedge. A second spring is disposed between the inner side of one end of each wedge-shaped positioning block inside the main body and the inner wall of the main body. The outer end of each wedge-shaped positioning block is used to restrict the X-axis and Y-axis degrees of freedom of the cast parts. At least three component support pins are provided on the outer periphery of the main body and are evenly spaced about the central axis of the main body to restrict the Z-direction degree of freedom of the cast component. When the lever drive screw is rotating, the drive wedge can drive the first wedge positioning block, the second wedge positioning block, and the third wedge positioning block to perform telescopic movements.

[0007] In some embodiments, the rotation positioning component includes: A positioning support plate, mounted on the base plate, having a through hole; and A side positioning sliding column is slidably connected to the through hole of the positioning support plate in the horizontal direction. A side positioning disk is installed at one end of the column near the self-centering component. The side positioning disk is used to restrict the rotational freedom of the cast parts.

[0008] In some embodiments, the foolproof component includes: The first anti-misalignment block, the second anti-misalignment block, the third anti-misalignment block, the fourth anti-misalignment block, and the anti-misalignment pin, which are circumferentially distributed on the outer periphery of the self-centering assembly, are used to constrain the clamping posture and clamping direction of the cast parts.

[0009] In some embodiments, the detection component includes: A detection support plate, which is mounted on the base plate, has a through hole; A detection slider, which is slidably connected to the through hole of the detection support plate in a horizontal direction, has a through hole at one end near the self-centering assembly; and The detection pin is slidably connected in the through hole of the detection slider in the vertical direction. A first spring is provided between the top end of the detection pin and the upper surface of the detection slider. The bottom end of the detection pin is used to determine whether the position of the key features of the cast parts meets the requirements of the drawing.

[0010] In some embodiments, the support includes a plurality of gauge support columns mounted on the bottom of the base plate.

[0011] In some embodiments, the four corners of the base plate are chamfered, and the sharp edges of all parts of the fixture are blunted.

[0012] The beneficial effects of the technical solution provided by this utility model include at least the following: This technical solution includes a self-centering assembly to restrict the X, Y, and Z degrees of freedom of the cast parts; a rotational positioning assembly to restrict the rotational degrees of freedom of the cast parts; a foolproof assembly, distributed according to the shape of the cast parts, to constrain the clamping posture and clamping direction of the cast parts; and a detection assembly to determine whether the position of the key features of the cast parts conforms to the drawing requirements. When the cast parts are in the detection state, it must be ensured that the self-centering assembly, rotational positioning assembly, and foolproof assembly have all completed the restriction of their degrees of freedom and the constraint of their clamping posture and clamping direction. In this case, the self-centering assembly positions the center reference of the cast parts with a positioning accuracy far exceeding that of ordinary cylindrical pins. It can also fix the cast parts, avoiding deformation of the cast parts caused by other clamping methods that would affect the detection accuracy, making it suitable for large-scale rapid detection. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] Figure 1 This diagram illustrates the structure of a self-centering rapid inspection fixture for key features of cast parts based on a circular reference, provided in an exemplary embodiment of the present invention.

[0015] Figure 2 A cross-sectional schematic diagram of a self-centering rapid inspection fixture for key features of a cast part based on a circular reference, provided in an exemplary embodiment of the present invention, is shown.

[0016] Figure 3 The diagram shows a bottom view of a cast component provided in an exemplary embodiment of the present invention.

[0017] Figure 4 The diagram shows a top view of a cast component provided in an exemplary embodiment of the present invention.

[0018] In the diagram: 1. Base plate; 2. First anti-mistake block; 3. Second anti-mistake block; 4. Third anti-mistake block; 5. Fourth anti-mistake block; 6. Detection pin; 7. Detection slider; 8. Detection support plate; 9. Positioning support plate; 10. Side positioning plate; 11. Side positioning sliding column; 12. Part support pin; 13. Main body; 131. Guide hole; 14. First wedge positioning block; 15. Lever drive screw; 16. Drive wedge block; 17. Anti-mistake pin; 18. First spring; 19. Inspection fixture support column; 20. Cover plate; 21. Second wedge positioning block; 22. Third wedge positioning block; 23. Second spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1This diagram illustrates the structure of a self-centering rapid inspection fixture for key features of cast parts based on a circular datum, provided in an exemplary embodiment of the present invention. Figure 2 This illustration shows a cross-sectional schematic diagram of a self-centering rapid inspection fixture for key features of cast parts based on a circular reference, provided in an exemplary embodiment of the present invention. The self-centering rapid inspection fixture for key features of cast parts based on a circular reference includes: a base plate 1, the bottom of which is provided with a support portion for supporting the fixture; a self-centering assembly, disposed on the base plate 1 and located in the middle of the base plate 1, which is used to restrict the X, Y, and Z degrees of freedom of the cast parts; and a rotation positioning assembly, disposed on the base plate 1 and located on one side of the self-centering assembly, which is used to restrict the rotation of the cast parts. The system includes: a degree of freedom; a foolproof component, which is set on the base plate 1 and distributed around the outer periphery of the self-centering component, and is distributed according to the shape of the cast part, used to constrain the clamping posture and clamping direction of the cast part; and a detection component, which is set on the base plate 1 and located on one side of the self-centering component, used to determine whether the position of the key features of the cast part meets the drawing requirements; wherein, when the cast part is in the detection state, it must be ensured that the self-centering component, the rotation positioning component, and the foolproof component have all completed the restriction of its degree of freedom and the constraint of its clamping posture and clamping direction.

[0023] In this embodiment, the self-centering component is located in the middle of the base plate 1, which can accurately align with the circular reference center of the component. By restricting the X-axis, Y-axis translation, and Z-axis displacement degrees of freedom, it establishes a positioning reference for detection. The central layout allows the limiting force to be applied evenly to the reference surface, reducing the influence of local deformation. The rotation positioning component is located on one side of the self-centering component, which can supplement the restriction of the component's rotational degree of freedom. Together with the self-centering component, it forms a full degree of freedom constraint, eliminating the circumferential movement that is prone to occur with the circular reference. The error-proof component is distributed along the outer periphery of the self-centering component according to the shape of the component. It uses physical blocking to constrain the clamping posture and direction, avoiding errors such as angle deviation and reversal during manual clamping, thus lowering the operation threshold. The detection component is located on one side of the self-centering component, which can align with the key features of the component and efficiently determine whether its position meets the drawing requirements.

[0024] For details, please refer to Figure 1 and Figure 2The self-centering assembly includes: a main body 13, which is disposed in the middle of the base plate 1, and a cover plate 20 is mounted on it. There is a gap between the cover plate 20 and the main body 13. The cover plate 20 has a through central hole. The upper part of the main body 13 has a guide hole 131 that is coaxial with and communicates with the central hole of the cover plate 20. The lower part of the main body 13 has a threaded hole that is coaxial with and communicates with the guide hole 131. A driving wedge 16 is sleeved on a lever driving screw 15 and can slide up and down along the guide hole 131. The top end of the lever driving screw 15 is located above the cover plate 20, and the bottom end of the lever driving screw 15 is threadedly connected to the threaded hole at the bottom of the main body 13. A first wedge positioning block 14, a second wedge positioning block 21, and a third wedge positioning block 22 are slidably disposed in the gap between the cover plate 20 and the main body 13. The three components are radially arranged, evenly spaced about the central axis of the main body 13. The outer side of the three components located inside the main body 13 is inclined and adapted to the inclined surface of the drive wedge block 16. A second spring 23 is provided between the inner side of the three components located inside the main body 13 and the inner wall of the main body 13. The outer side of the three components located outside the main body 13 is used to restrict the X and Y directions of freedom of the cast parts. There are also part support pins 12, at least three of which are arranged on the outer periphery of the main body 13 and evenly spaced about the central axis of the main body 13 to restrict the Z direction of freedom of the cast parts. When the lever drive screw 15 is in a rotating state, the drive wedge block 16 can drive the first wedge positioning block 14, the second wedge positioning block 21, and the third wedge positioning block 22 to perform telescopic movements.

[0025] In this embodiment, the gap between the main body 13 and the cover plate 20 provides sliding space for the three wedge-shaped positioning blocks. The coaxial guide hole 131 and threaded hole ensure that the drive wedge 16 moves smoothly along the axis. The lever drive screw 15 and the drive wedge 16 form a power transmission structure. When the lever drive screw 15 rotates, it drives the drive wedge 16 to slide up and down. The inclined plane is used to push the three wedge-shaped positioning blocks to extend and retract. The three are evenly distributed along the central axis of the main body and can apply positioning force evenly from different directions to avoid positioning offset in the X and Y directions. The second spring 23 on the inner side can drive the three wedge-shaped positioning blocks to reset after detection. At least three evenly distributed part support pins 12 stably support the parts to limit the Z-direction degree of freedom and cooperate with the three wedge-shaped positioning blocks to achieve stable self-centering of the parts during the detection process.

[0026] For more details, please refer to Figure 1 and Figure 2 The rotation positioning assembly includes: a positioning support plate 9, which is mounted on the base plate 1 and has a through hole; and a side positioning sliding column 11, which is slidably connected in the through hole of the positioning support plate 9 in the horizontal direction, and a side positioning disk 10 is mounted on one end of the column near the self-centering assembly. The side positioning disk 10 is used to restrict the rotational freedom of the cast parts.

[0027] In this embodiment, the side positioning sliding column 11 can be flexibly adjusted to adjust the distance from the self-centering component, which facilitates the clamping and positioning of parts. The side positioning disk 10 can fit the rotation reference of the parts and restrict the rotation of the parts around the axis by physical locking, so as to ensure that the posture of the parts is fixed during inspection.

[0028] Specifically, please refer to Figure 1 and Figure 2 The anti-mistake component includes: a first anti-mistake block 2, a second anti-mistake block 3, a third anti-mistake block 4, a fourth anti-mistake block 5, and an anti-mistake pin 17, which are circumferentially distributed on the outer periphery of the self-centering component, for constraining the clamping posture and clamping direction of the cast parts.

[0029] In this embodiment, four anti-misalignment blocks can conform to the irregular shape of the parts and form physical barriers from different directions. If the clamping angle of the parts is skewed or reversed, the anti-misalignment blocks will directly prevent them from being placed in place, forcibly limiting the only correct posture. The anti-misalignment pin 17 can be adapted to the specific reference hole of the parts to further lock the clamping direction. It can quickly complete the correct clamping without relying on the operator's experience.

[0030] For more details, please refer to Figure 1 and Figure 2 The detection assembly includes: a detection support plate 8, which is mounted on a base plate 1 and has a through hole; a detection slider 7, which is slidably connected in the through hole of the detection support plate 8 in the horizontal direction and has a through hole at one end near the self-centering component; and a detection pin 6, which is slidably connected in the through hole of the detection slider 7 in the vertical direction. A first spring 18 is provided between the top end of the detection pin 6 and the upper surface of the detection slider 7, and the bottom end of the detection pin 6 is used to determine whether the position of the key features of the cast part meets the requirements of the drawing.

[0031] In this embodiment, the through hole of the detection support plate 8 provides a horizontal sliding guide for the detection slider 7, which can flexibly move closer to or away from the self-centering component, which is convenient for clamping parts and can also drive the detection pin 6 to approach the feature to be detected; while the through hole at the end of the detection slider 7 provides a vertical sliding channel for the detection pin 6, the bottom end of the detection pin 6 directly corresponds to the key feature of the part, and the first spring 18 can realize the automatic reset of the detection pin 6.

[0032] Further, please refer to Figure 1 and Figure 2 The support includes several fixture support columns 19 installed at the bottom of the base plate 1 to prevent the base plate 1 from directly contacting the placement surface and causing wear. The four corners of the base plate 1 are chamfered, and the sharp edges of all parts of the fixture are rounded to prevent operators from being scratched when clamping parts.

[0033] Next, combined Figures 1 to 4The working principle of a self-centering rapid inspection tool for key features of cast parts based on a circular reference, as described in the embodiments of this utility model, is explained.

[0034] First, manually pull the detection slider 7 and the side positioning sliding column 11 to move them away from the self-centering component and back to the preset initial position; Subsequently, the rotating lever drives the screw 15, which in turn drives the first wedge positioning block 14, the second wedge positioning block 21, and the third wedge positioning block 22 to retract into the body 13 simultaneously through the drive wedge block 16, thus reserving space for clamping the cast parts. Next, the cast parts are placed close to the inside of the first anti-mistake block 2, the second anti-mistake block 3, the third anti-mistake block 4, and the fourth anti-mistake block 5. At the same time, the anti-mistake pin 17 is embedded in the center hole of the C surface of the parts to constrain the clamping posture and direction of the cast parts. At this time, the main body 13 passes through the A surface of the cast parts, and the B surface of the cast parts rests on the part support pin 12, thus completing the restriction of the Z-direction freedom of the cast parts. Next, the side positioning sliding column 11 is pushed closer to the self-centering assembly and reaches the preset end position, so that the side positioning disk 10 is embedded in the center hole of the D surface of the casting part to restrict the rotational freedom of the casting part. Then, the lever drive screw 15 is rotated, causing the drive wedge block 16 to drive the first wedge positioning block 14, the second wedge positioning block 21, and the third wedge positioning block 22 to extend out of the main body 13 and contact the A surface of the casting part, thereby restricting the X and Y degrees of freedom of the casting part. At this time, all features of the casting part are in a relatively fixed state. Finally, push the detection slider 7 to move towards the self-centering component and reach the preset endpoint position, and simultaneously press down the detection pin 6. If the sleeve at the bottom of the detection pin 6 can be successfully fitted onto the key feature E column of the casting part, then the key feature of the casting part meets the drawing requirements; otherwise, it does not meet the drawing requirements.

[0035] In summary, this technical solution includes a self-centering assembly to restrict the X, Y, and Z degrees of freedom of the cast parts; a rotational positioning assembly to restrict the rotational degrees of freedom of the cast parts; a foolproof assembly, distributed according to the shape of the cast parts, to constrain the clamping posture and clamping direction of the cast parts; and a detection assembly to determine whether the position of the key features of the cast parts conforms to the drawing requirements. When the cast parts are in the detection state, it must be ensured that the self-centering assembly, rotational positioning assembly, and foolproof assembly have all completed the restriction of their degrees of freedom and the constraint of their clamping posture and clamping direction. In this case, the positioning accuracy of the cast parts by using the self-centering assembly to locate the center reference is much higher than that of ordinary cylindrical pins. It can also fix the cast parts, avoiding deformation of the cast parts caused by other clamping methods that would affect the detection accuracy, making it suitable for large-scale rapid detection.

[0036] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0037] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A self-centering rapid inspection tool for key features of cast parts based on a circular datum, characterized in that, include: The base plate (1) has a support part at its bottom for supporting the inspection tool; The self-centering component is disposed on the base plate (1) and located in the middle of the base plate (1), and is used to restrict the X, Y and Z degrees of freedom of the cast parts; A rotation positioning component is disposed on the base plate (1) and located on one side of the self-centering component, which is used to restrict the rotational freedom of the cast parts; A foolproof component, disposed on the base plate (1) and distributed around the outer periphery of the self-centering component, is distributed according to the shape of the cast parts and is used to constrain the clamping posture and clamping direction of the cast parts; and The detection component is set on the base plate (1) and located on one side of the self-centering component. It is used to determine whether the position of the key features of the cast parts meets the requirements of the drawing. When the cast parts are under inspection, it is necessary to ensure that the self-centering component, the rotation positioning component, and the foolproof component have all completed the restriction of their degrees of freedom, as well as the constraint of their clamping posture and clamping direction.

2. The self-centering rapid inspection fixture for key features of cast parts based on a circular datum according to claim 1, characterized in that, The self-centering component includes: The main body (13) is located in the middle of the base plate (1) and a cover plate (20) is installed on it. There is a gap between the cover plate (20) and the main body (13). The cover plate (20) has a through central hole. The upper part of the main body (13) has a guide hole (131) that is coaxial with and communicates with the central hole of the cover plate (20). The lower part of the main body (13) has a threaded hole that is coaxial with and communicates with the guide hole (131). A drive wedge (16) is sleeved on a lever drive screw (15) and can slide up and down along the guide hole (131). The top end of the lever drive screw (15) is located above the cover plate (20), and the bottom end of the lever drive screw (15) is threadedly connected to the threaded hole at the bottom of the main body (13). The first wedge-shaped positioning block (14), the second wedge-shaped positioning block (21), and the third wedge-shaped positioning block (22) are slidably disposed in the gap between the cover plate (20) and the main body (13). They are arranged radially along the main body (13) and evenly spaced about the central axis of the main body (13). The outer side of one end of each block inside the main body (13) is inclined and adapted to the inclined surface of the driving wedge block (16). A second spring (23) is provided between the inner side of one end of each block inside the main body (13) and the inner wall of the main body (13). The outer end of each block outside the main body (13) is used to restrict the X-axis and Y-axis degrees of freedom of the cast parts. At least three component support pins (12) are provided on the outer periphery of the body (13) and are evenly spaced about the central axis of the body (13) to restrict the Z-direction freedom of the cast component. When the lever drive screw (15) is in a rotating state, the drive wedge (16) can drive the first wedge positioning block (14), the second wedge positioning block (21), and the third wedge positioning block (22) to perform telescopic movements.

3. The self-centering rapid inspection fixture for key features of cast parts based on a circular datum according to claim 1, characterized in that, The rotation positioning component includes: A positioning support plate (9), which is mounted on the base plate (1), has a through hole; and A side positioning sliding column (11) is slidably connected in the through hole of the positioning support plate (9) in the horizontal direction. A side positioning disk (10) is installed at one end of the column near the self-centering component. The side positioning disk (10) is used to restrict the rotational freedom of the cast parts.

4. The self-centering rapid inspection tool for key features of cast parts based on a circular datum according to claim 1, characterized in that, The error-proof component includes: The first anti-misalignment block (2), the second anti-misalignment block (3), the third anti-misalignment block (4), the fourth anti-misalignment block (5), and the anti-misalignment pin (17) are circumferentially distributed on the outer periphery of the self-centering assembly to constrain the clamping posture and clamping direction of the cast parts.

5. The self-centering rapid inspection tool for key features of cast parts based on a circular datum according to claim 1, characterized in that, The detection component includes: A detection support plate (8) is mounted on the base plate (1) and has a through hole; A detection slider (7) is slidably connected in the horizontal direction within the through hole of the detection support plate (8), and has a through hole at one end near the self-centering assembly; and The detection pin (6) is slidably connected in the through hole of the detection slider (7) in the vertical direction. A first spring (18) is provided between the top end of the detection pin (6) and the upper surface of the detection slider (7). The bottom end of the detection pin (6) is used to determine whether the position of the key features of the cast parts meets the requirements of the drawing.

6. The self-centering rapid inspection fixture for key features of cast parts based on a circular datum according to claim 1, characterized in that, The support includes a plurality of gauge support columns (19) installed at the bottom of the base plate (1).

7. The self-centering rapid inspection tool for key features of cast parts based on a circular datum according to claim 1, characterized in that, The four corners of the base plate (1) are chamfered, and the sharp edges of all parts of the inspection fixture are blunted.

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