Auxiliary tooling for frame coordinate measuring machine

Abstract

This utility model discloses an auxiliary fixture for coordinate measuring machine (CMM) measurement of a motorcycle frame, relating to the field of motorcycle frame inspection technology. It solves the problems of cumbersome operation, low efficiency, large errors, and inconsistent benchmarks in existing measurement methods. The fixture includes a front support mechanism, a rear support mechanism, and a mandrel. The front support mechanism includes a height-adjustable support platform, with height adjustment achieved via a lead screw, guide rail, and rotating handle. The rear support mechanism includes symmetrical left and right support seats connected by a connecting rod. The support seats have V-grooves and are fixed to the measurement platform by adjustable strong magnets. The mandrel passes through a hole at the rear of the frame and is placed in the V-groove. This fixture can accurately position the frame, adapt to the height requirements of different frame types, ensure stable rear positioning, unify the design, manufacturing, and inspection benchmarks, and improve measurement efficiency and accuracy. It is suitable for the inspection of four-wheeled and two-wheeled motorcycle frames.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle frame testing technology, and in particular to a motorcycle frame measurement auxiliary device, specifically an auxiliary tooling for frame coordinate measuring. Background Technology

[0002] Currently, there are many problems in the three-coordinate measurement process of motorcycle frames, including:

[0003] 1. Existing testing methods lack a dedicated benchmark positioning device, resulting in inconsistent product benchmark heights. This necessitates manual marking by testing personnel to confirm the benchmark for various types of frames, making the operation extremely cumbersome.

[0004] 2. This method not only makes the clamping, measurement and conversion time of the detection process too long and the work efficiency extremely low, but also easily causes large detection errors due to the lack of a stable reference and the influence of factors such as the roughness of the parts.

[0005] 3. Existing methods cannot achieve the unification of design datum, manufacturing datum and inspection datum, making it difficult to guarantee the accuracy and reliability of measurement results, and failing to meet the needs of high-precision manufacturing and testing of motorcycle frames. Utility Model Content

[0006] This invention aims to solve the problems existing in the prior art by providing an auxiliary tooling for frame coordinate measuring, which solves the problems of cumbersome operation, low work efficiency, large detection error and inconsistent benchmarks in the current frame coordinate measuring, and meets the needs of high-precision detection of motorcycle frames.

[0007] The technical solution adopted by this utility model to solve its technical problem is as follows: This auxiliary tooling for three-coordinate measurement of a vehicle frame includes a front support mechanism, a rear support mechanism, and a mandrel. The front support mechanism includes a liftable support platform, and the rear support mechanism includes symmetrically placed support seats. The support seats are fixed on the three-coordinate measurement platform. The front support platform is used to support the front of the vehicle frame, while the rear mandrel passes through the original pivot hole at the rear of the vehicle frame and is positioned on the support seats with its left and right ends respectively, forming an auxiliary tooling for adjusting the height of the front end and positioning the rear end of the vehicle frame. With this configuration, the auxiliary tooling can flexibly adapt to the front end height of different vehicle frames through the liftable support platform of the front support mechanism, ensuring that the front end is stably supported and improving the adaptability of the tooling to various vehicle frames. The symmetrical support seats of the rear support mechanism, together with the mandrel passing through the original pivot hole at the rear of the vehicle frame, can accurately limit the rear end of the vehicle frame, ensuring stable and symmetrical positioning of the rear end. The combination of adjustable front height and rear positioning ensures stable overall positioning of the frame during measurement, preventing wobbling and maintaining a consistent measurement benchmark. Simultaneously, it reduces the need for temporary frame adjustments, making clamping more convenient and thus improving the efficiency and stability of coordinate measuring machines (CMMs) and guaranteeing the reliability of the measurement process.

[0008] As a further improvement of this utility model, the front support mechanism of the frame includes a fixed seat with guide rails arranged vertically on the left and right sides. A support platform is slidably connected to the guide rails. A lead screw, which is driven by the support platform, is vertically arranged on the fixed seat, and a rotating handle is fixed at the top of the lead screw. In this improved structure of the front support mechanism of the frame, the fixed seat provides a stable installation base for the whole, the left and right vertical guide rails provide precise guidance for the support platform, limit the offset of the support platform during lifting and lowering, ensure its stable sliding in the vertical direction, and improve the stability of the support platform position. The drive connection between the lead screw and the support platform, combined with the rotating handle, drives the support platform to lift and lower by rotating the handle, realizing fine adjustment of the height. The operation is convenient and the adjustment accuracy is higher, which can accurately adapt to the specific requirements of different frames for the front support height. The overall structure makes the height adjustment of the support platform both stable and accurate, avoiding shaking or offset during the adjustment process, further ensuring the reliability of the front positioning of the frame, and enhancing the adaptability of the tooling to different frames.

[0009] As a further improvement of this utility model, the left and right support seats are connected by a horizontal connecting rod to form a symmetrical left-right structure. The connection of the left and right support seats into a single structure ensures a stable and symmetrical arrangement, preventing relative displacement of the support seats due to external forces during use and ensuring symmetry accuracy. The connecting rod enhances the overall rigidity of the support seats, reducing deformation of individual support seats under stress and making the mandrel placement more stable. This structure makes the installation and positioning of the support seats more convenient, eliminating the need for repeated calibration of the left and right positions, further improving the stability and operational efficiency of the tooling, and ensuring consistent tail-end positioning.

[0010] As a further improvement of this utility model, the support base is provided with multiple V-shaped grooves of different sizes arranged side-by-side in the front-rear direction for placing mandrels. The bottom surface of the support base and the walls of the V-shaped grooves are precision-machined to be within the detection error range of the coordinate measuring platform surface. The support base has multiple V-shaped grooves of different sizes arranged side-by-side in the front-rear direction, allowing for flexible selection of the appropriate groove to place the mandrel according to its size specifications and the position of the connection hole at the rear of the frame. Different sized V-shaped grooves can accurately match mandrels of different diameters, ensuring stable engagement of various mandrels. The side-by-side layout in the front-rear direction can adapt to different installation positions of the mandrel in the front-rear direction, further improving the adaptability of the tooling to the positioning of the rear of frames with different structures, making the mandrel positioning more accurate and stable, and enhancing the versatility and flexibility of the tooling. After precision machining, the bottom surface of the support base and the V-groove wall can fit tightly against the surface of the coordinate measuring platform, reducing positioning deviations caused by structural errors of the tooling itself and improving the stability of the connection between the support base and the platform. The precision-machined V-groove wall can ensure the consistency of mandrel placement, thereby enhancing the reliability of the rear positioning of the frame and providing a more accurate benchmark for coordinate measuring.

[0011] As a further improvement of this utility model, the support base is fixed to the coordinate measuring platform by an adjustable strong magnet. This method allows for quick installation and removal of the support base, making operation convenient and efficient, and reducing the time cost of tooling clamping. The adjustable feature allows for flexible adjustment of the support base's position, facilitating precise positioning according to the measurement requirements of different vehicle frames. The strong magnetic fixing method ensures a tight fit between the support base and the measuring platform, preventing displacement during measurement and ensuring the stability of the support base's positioning. This improves the overall positioning accuracy of the tooling and guarantees the reliable execution of the measurement work.

[0012] The beneficial effects of this utility model are as follows: Its structure is reasonable and compact. By setting up a front support mechanism, a rear support mechanism, and a mandrel, it achieves precise positioning of the frame. The adjustable support platform of the front support mechanism can adapt to the height requirements of different types of frames. The support seat of the rear support mechanism, combined with a V-groove and adjustable strong magnet fixation, ensures the accuracy and stability of the frame's rear positioning. Using this fixture for coordinate measuring machine (CMM) measurement is simple and practical, reducing clamping, measurement, and conversion time, avoiding the influence of part roughness on measurement results, and ensuring the overlap of design, manufacturing, and inspection datums. This improves measurement efficiency and the accuracy of measurement data, and can meet the testing needs of different types of motorcycle frames (such as four-wheeled and two-wheeled frames). Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the two-wheeled vehicle frame for testing according to this utility model;

[0014] Figure 2This is a schematic diagram of the structure of the four-wheeled vehicle frame of this utility model;

[0015] Figure 3 This is a right view of the two-wheeled vehicle frame tested according to this utility model;

[0016] Figure 4 This is a right view of the four-wheeled vehicle frame tested according to this utility model.

[0017] Explanation of reference numerals in the attached diagram: 1. Mandrel; 2. Support platform; 3. Support base; 4. Fixing base; 5. Guide rail; 6. Lead screw; 7. Rotary handle; 8. Connecting rod. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Referring to the attached drawings: The auxiliary tooling for the three-coordinate measurement of the vehicle frame in this embodiment includes a front support mechanism, a rear support mechanism, and a mandrel 1. The front support mechanism includes a liftable support platform 2, and the rear support mechanism includes left and right symmetrically placed support seats 3. The support seats 3 are fixed on the three-coordinate measurement platform. The front support platform 2 is used to support the front of the vehicle frame, while the rear mandrel passes through the original pivot hole at the rear of the vehicle frame and limits the left and right ends of the mandrel to be placed on the support seats 3 to form an auxiliary tooling for the detection of the vehicle frame with adjustable front height and rear end positioning.

[0020] The front support mechanism of the frame includes a fixed seat 4, with guide rails 5 vertically arranged on the left and right sides of the fixed seat 4. The support platform 2 is slidably connected to the guide rails 5. A lead screw 6 is vertically arranged on the fixed seat 4 and is connected to the support platform 2 for transmission. A rotating handle 7 is fixed at the top of the lead screw 6.

[0021] The left and right support seats 3 are connected by a horizontal connecting rod 8 to form a symmetrical left and right structure.

[0022] The support base 3 is provided with multiple V-shaped grooves of different sizes arranged side by side in the front and back direction to place mandrels. The bottom surface of the support base 3 and the walls of the V-shaped grooves are precision machined to be within the detection error range of the coordinate measuring platform surface.

[0023] Preferably, the support base 3 is fixed to the coordinate measuring platform by an adjustable strong magnet.

[0024] When using this fixture to measure the four-wheeled vehicle frame, first place the rear support mechanism of the frame on a coordinate measuring machine (CMM) platform. Use a probe to measure the X-axis dimension of the support seat 3 of the rear support mechanism, ensuring that the support seat 3 is parallel to the X-axis of the CMM. Then, place the alignment bar in the corresponding V-groove and use a probe to measure the center surface dimension of the alignment bar. Fine-tune the rear support mechanism of the frame until the center of the alignment bar is parallel to the Y-axis of the CMM. Finally, fix the rear support mechanism of the frame with an adjustable strong magnet. Next, calculate the dimensions of the center of the swingarm and the front of the vehicle based on the position of the four-wheeled frame in its working state. Combined with the V-groove height, calculate the height of the front support of the frame and adjust the support platform 2 to this height by rotating the handle 7. Afterward, insert the mandrel into the frame and place it in the corresponding V-groove. Place the front of the vehicle on the support platform 2 of the front support mechanism of the frame. Take measurements with the center of the swingarm as the origin and the center surface of the frame as the reference.

[0025] When using this fixture to measure a two-wheeled vehicle frame, first fix the rear support mechanism of the frame as described above. Then, ensure the center of the head tube is perpendicular to the horizontal plane, calculate the dimensions of the swingarm center and the lower end face of the head tube, and calculate the front support height of the frame based on the V-groove height. Adjust the support platform 2 to this height. Next, insert the mandrel into the frame and place it in the corresponding V-groove. Place the lower end face of the head tube on the support platform 2 of the front support mechanism of the frame, and measure with the center of the swingarm as the origin and the center plane of the frame as the reference.

[0026] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. An auxiliary tooling for three-coordinate measurement of a vehicle frame, characterized in that: The device includes a front support mechanism for the frame, a rear support mechanism for the frame, and a mandrel (1). The front support mechanism for the frame includes a liftable support platform (2), and the rear support mechanism for the frame includes symmetrically placed support seats (3). The support seats (3) are fixed on a coordinate measuring platform. The front support platform (2) is used to support the front of the frame, while the rear mandrel passes through the original pivot hole at the rear of the frame and limits the left and right ends of the mandrel to be placed on the support seats (3) to form a detection auxiliary tooling for the frame front end height adjustable and the rear end positioning.

2. The auxiliary tooling for three-coordinate measurement of the vehicle frame according to claim 1, characterized in that: The front support mechanism of the frame includes a fixed seat (4), and the fixed seat (4) has guide rails (5) vertically arranged on the left and right. The support platform (2) is slidably connected to the guide rails (5). The fixed seat (4) has a lead screw (6) vertically arranged and connected to the support platform (2). The top of the lead screw (6) is fixed with a rotating handle (7).

3. The auxiliary tooling for three-coordinate measurement of the vehicle frame according to claim 1, characterized in that: The left and right support bases (3) are connected by a horizontal connecting rod (8) to form a symmetrical left and right structure.

4. The auxiliary tooling for three-coordinate measurement of the vehicle frame according to claim 1, characterized in that: The support base (3) is provided with multiple V-shaped grooves of different sizes arranged side by side in the front and back direction for placing mandrels. The bottom surface of the support base (3) and the wall of the V-shaped groove are precision machined to be within the detection error range of the coordinate measuring platform surface.

5. The auxiliary tooling for three-coordinate measurement of the vehicle frame according to claim 1, characterized in that: The support base (3) is fixed to the coordinate measuring platform by an adjustable strong magnet.

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