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CN-121977917-A - Heavy-calipers iron shoe hardness measurement clamp, system and positioning method for hardness measurement

CN121977917ACN 121977917 ACN121977917 ACN 121977917ACN-121977917-A

Abstract

The invention relates to the technical field of mechanical workpiece hardness measurement, and provides a heavy-duty clamp iron shoe hardness measurement clamp which comprises a base platform for providing a mounting reference, a positioning module, a core frame, a fastening system and a guide assembly, wherein the positioning module is fixed on the base platform to realize positioning of a measured piece, the core frame is mounted on the base platform, the fastening system is used for fixing the positioning module by using a quantization torque and locking the core frame to form a rigid vibration-resistant structure, and the guide assembly is integrated on the core frame to provide a measurement reference for a hardness tester pressure head, and the reference center of the guide assembly is in spatial linkage with the constraint position of the positioning module to maintain exposure of a measured point of the measured piece. Furthermore, the accuracy and reliability of the test result are ensured through the cooperative work of the precision components.

Inventors

  • ZHANG MINGKAI
  • LI ZINUO

Assignees

  • 蓓尔敏工业科技(莱州市)有限公司

Dates

Publication Date
20260505
Application Date
20251102

Claims (12)

  1. 1. A heavy truck shoe hardness measurement jig, comprising: A base platform providing an installation reference; The positioning module is fixed on the basic platform to position the tested piece; the core frame is arranged on the basic platform; a fastening system for securing the positioning module and locking the core frame to form a rigid anti-vibration structure using a quantified torque; a guide assembly integrated with the core frame to provide a measurement datum for the durometer indenter, The reference center of the guide assembly is in spatial linkage with the constraint position of the positioning module so as to maintain exposure of the measuring point of the measured piece.
  2. 2. The heavy truck shoe hardness measurement jig of claim 1 wherein said guide assembly has a tee set of holes for adjusting the center position of said durometer ram.
  3. 3. The heavy truck shoe hardness measurement jig of claim 2 wherein, The hardness of the positioning module is HRC28-32 after quenching and tempering; the core frame comprises a connecting seat, wherein the connecting seat is subjected to quenching treatment, and the hardness is HRC50-55.
  4. 4. The heavy truck shoe hardness measurement jig of claim 2 or 3 wherein, The T-shaped hole group comprises a transverse groove and a longitudinal groove, and the intersection point of the transverse groove and the longitudinal groove defines a pressure head center reference; the quenching hardness HRC50-55 of the connecting seat is matched with the thickness of the oxidized blackening layer of the locking nut of the fastening system, and elastic pre-deformation is generated when a quantized torque is applied to compensate the assembly gap of the core frame; The extending direction of the longitudinal groove coincides with the force transmission axis of the connecting seat, so that a vibration conduction attenuation channel is formed.
  5. 5. The heavy truck shoe hardness measurement jig of claim 4 further comprising: the displacement sensing unit is integrated in the guide assembly and dynamically compensates the deviation of the measuring point caused by the deformation or positioning abrasion of the workpiece through the T-shaped hole group; the pre-tightening force of the lock nut is monitored in real time by the pressure sensing unit, and the clamping force is automatically adjusted based on a quantized torque protocol, so that the fluctuation of the tightening force is smaller than a preset threshold value.
  6. 6. A heavy truck shoe hardness measurement system comprising: the heavy truck shoe hardness measurement jig of any one of claims 1-5; A durometer, further comprising: a durometer test stand; A processor operable to perform the steps of: s1) establishing a three-dimensional measurement space model of the sclerometer test board; s2) constructing a three-dimensional clamp model of the heavy-duty clamp special for the iron shoe; S3) determining a preset positioning position of the three-dimensional clamp model in the three-dimensional measurement space model; s4) collecting the space position data of the heavy-duty iron shoe special fixture actually placed on the test bench; S5) calculating a position deviation between the spatial position data and the preset positioning position; s6) fixing the heavy-duty clamp special for the iron shoe when the position deviation meets the preset tolerance requirement.
  7. 7. The heavy truck shoe hardness measurement system of claim 6 wherein step S1 comprises: s11, acquiring three-dimensional point cloud data of the surface of the sclerometer test board by adopting three-dimensional scanning equipment; S12, processing the three-dimensional point cloud data to generate an initial surface model of the test bench; S13, defining a reference coordinate system of the positioning surface of the test table in the initial surface model.
  8. 8. The heavy truck shoe hardness measurement system of claim 6 wherein step S2 comprises: S21, acquiring a point cloud frame sequence and synchronous inertial measurement unit data of the clamp through a scanning device; s22, fusing the point cloud frame sequence and the inertia measurement unit data by adopting a tightly coupled SLAM algorithm, and generating and optimizing a global consistent point cloud model of the clamp in real time; s23, performing surface fitting and smoothing on the global consistent point cloud model to generate a smooth B-Rep surface model; S24, carrying out constraint optimization on key features and theoretical design dimensions of the B-Rep curved surface model, and completing construction of the three-dimensional clamp model.
  9. 9. A method of positioning hardness measurements specific to the heavy truck shoe hardness measurement jig of any one of claims 1-5, comprising: s1) establishing a three-dimensional measurement space model of a sclerometer test board; s2) constructing a three-dimensional clamp model of the heavy-duty clamp special for the iron shoe; S3) determining a preset positioning position of the three-dimensional clamp model in the three-dimensional measurement space model; s4) collecting the space position data of the heavy-duty iron shoe special fixture actually placed on the test bench; S5) calculating a position deviation between the spatial position data and the preset positioning position; s6) fixing the heavy-duty clamp special for the iron shoe when the position deviation meets the preset tolerance requirement.
  10. 10. The method for positioning hardness measurement of a heavy truck shoe hardness measurement jig of claim 9, wherein step S1 comprises: s11, acquiring three-dimensional point cloud data of the surface of the sclerometer test board by adopting three-dimensional scanning equipment; S12, processing the three-dimensional point cloud data to generate an initial surface model of the test bench; S13, defining a reference coordinate system of the positioning surface of the test table in the initial surface model.
  11. 11. The method for positioning hardness measurement of a heavy truck shoe hardness measurement jig of claim 9, wherein step S2 comprises: S21, acquiring a point cloud frame sequence and synchronous inertial measurement unit data of the clamp through a scanning device; s22, fusing the point cloud frame sequence and the inertia measurement unit data by adopting a tightly coupled SLAM algorithm, and generating and optimizing a global consistent point cloud model of the clamp in real time; s23, performing surface fitting and smoothing on the global consistent point cloud model to generate a smooth B-Rep surface model; S24, carrying out constraint optimization on key features and theoretical design dimensions of the B-Rep curved surface model, and completing construction of the three-dimensional clamp model.
  12. 12. The positioning method of hardness measurement of a heavy truck shoe hardness measurement jig according to claim 11, wherein step S22 includes: s221, performing motion distortion correction on the point cloud frame sequence based on the inertial measurement unit data to generate a preliminary correction point cloud; S222, predicting the pose of the current frame by using the data of the inertial measurement unit by taking the optimized pose at the previous moment as an initial value; s223, performing point cloud matching according to the predicted pose, and simultaneously optimizing the pose and map points through the map optimization rear end to generate an optimized global point cloud map; S224, correcting the accumulated error by using loop detection, and outputting a globally consistent accurate point cloud model.

Description

Heavy-calipers iron shoe hardness measurement clamp, system and positioning method for hardness measurement Technical Field The invention relates to the technical field of mechanical workpiece hardness measurement, and provides a heavy-duty clamp iron shoe hardness measurement clamp. Background In the field of heavy truck manufacturing, the hardness of an iron shoe component is a key indicator for measuring the durability and safety of the iron shoe component. Currently, the detection of this index relies mainly on the operator manually placing the clamp on the durometer test stand and roughly locating it by visual inspection. The traditional method is low in efficiency, and more serious, the manual positioning error can cause that the pressure head of the sclerometer cannot accurately act on a specific sampling point of the clamp, so that a measurement result has obvious deviation and poor repeatability, and the severe requirements on data accuracy and consistency in a high-quality manufacturing flow cannot be met. The existing measuring clamp has certain technical limitations. Most clamps, while providing the basic clamping function, lack a high precision positioning reference and an effective vibration resistant structure. When the durometer applies an impact load, the clamp is prone to small displacements or vibrations, which can be directly transferred to the measurement, introducing additional disturbance errors. In addition, the key parts of the clamp are easy to wear after long-term use, the positioning accuracy of the clamp is attenuated, and the traditional design lacks a compensation mechanism for the wear, so that the life cycle and the reliability of the clamp are different from the actual production requirements. With the development of intelligent manufacturing, although researches are attempted to introduce vision or laser scanning technology into a measuring and positioning link, the technical schemes are often mutually isolated from a clamp body, and an integrated system solution is not formed. How to realize the deep fusion between the rigidity stabilization of the fixture physical structure and the intelligent precision of the digital positioning algorithm, fundamentally solves the industrial problems of repeated accurate positioning and anti-interference measurement, and still is the technical problem to be solved at present. Disclosure of Invention The invention aims to solve the problems of insufficient positioning precision, poor measurement repeatability and weak anti-vibration interference capability of the clamp in the prior art, and realize rapid, accurate and stable automatic hardness measurement. In view of the above, in one embodiment of the present invention, there is provided a heavy-calipers shoe hardness measuring jig including: A base platform providing an installation reference; The positioning module is fixed on the basic platform to position the tested piece; the core frame is arranged on the basic platform; a fastening system for securing the positioning module and locking the core frame to form a rigid anti-vibration structure using a quantified torque; And the guide assembly is integrated in the core frame to provide a measurement reference for the hardness tester pressure head, wherein the reference center of the guide assembly is in spatial linkage with the constraint position of the positioning module so as to maintain the exposure of the measurement point of the measured piece. Optionally, in some embodiments, the guide assembly has a set of tee holes for adjusting the center position of the durometer ram. Optionally, in some embodiments, the positioning module is quenched and tempered to a hardness of HRC28-32; the core frame comprises a connecting seat, wherein the connecting seat is subjected to quenching treatment, and the hardness is HRC50-55. Optionally, in some embodiments, the set of tee holes includes a transverse slot and a longitudinal slot, an intersection of the transverse slot and the longitudinal slot defining a ram center datum; the quenching hardness HRC50-55 of the connecting seat is matched with the thickness of the oxidized blackening layer of the locking nut of the fastening system, and elastic pre-deformation is generated when a quantized torque is applied to compensate the assembly gap of the core frame; The extending direction of the longitudinal groove coincides with the force transmission axis of the connecting seat, so that a vibration conduction attenuation channel is formed. Optionally, in some embodiments, further comprising: the displacement sensing unit is integrated in the guide assembly and dynamically compensates the deviation of the measuring point caused by the deformation or positioning abrasion of the workpiece through the T-shaped hole group; the pre-tightening force of the lock nut is monitored in real time by the pressure sensing unit, and the clamping force is automatically adjusted based on a quantized torque protocol,