Screw fastening inspection method, apparatus, system, computer program product, and computer-readable recording medium

Abstract

The disclosed screw fastening inspection method, apparatus, system, computer program product, and computer-readable recording medium, the method being executed by a processor, includes: acquiring fastening curves of several torques relative to several angles measured during the fastening process; setting several inspection windows within several angular ranges based on the screw specifications, including hole finding, seat placement, and tightening inspection windows, each inspection window defining at least one parameter range, including a torque range; within the angular range of each inspection window, generating at least one comparison result between a local torque within the angular range of several torques based on the fastening curves and the at least one parameter range; and generating an inspection result based on the at least one comparison result of the local torque within the angular range of each inspection window. This effectively inspects the screw fastening quality.

Claims

1. A screw fastening inspection method, executed by a processor, the method comprising: Obtain a locking curve of several torques versus several angles measured during a screw fastening process; Based on the screw specifications, several check windows are set in several angle ranges, each of which defines at least one parameter range, including a torque range. Each of the check windows defines a torque upper limit, a torque lower limit, an angle upper limit, and an angle lower limit. The check windows are arranged in ascending angles and include a hole-finding check window, a mounting check window, and a tightening check window. The check windows are several window frames formed based on several representative torque inflection points in a reference tightening curve measured by the screw during a normal tightening process. A representative angle in the angle range where a first window frame is located in the ascending angle arrangement is a hole-finding angle associated with an over-limit downward displacement measured by the screw during the normal tightening process. Within the angular range of each of the check windows, at least one comparison result is generated between the local torque of the torques of the locking curve within the angular range and the at least one parameter range; and a check result is generated based on the at least one comparison result of the local torque of the locking curve within the angular range of each of the check windows.

2. The screw fastening inspection method as claimed in claim 1, wherein, within the angular range of each of the inspection windows, the local torque within the angular range of the torques of the fastening curve is compared with the at least one parameter range to generate the at least one comparison result, including: Within the angular range of each of the check windows, a torque comparison result is generated by comparing the local torque within the angular range of the torques of the locking curve with the torque range defined by the corresponding one of the check windows.

3. The screw fastening inspection method as claimed in claim 1, wherein, within the angular range of each of the inspection windows, the local torque within the angular range of the torques of the fastening curve is compared with the at least one parameter range to generate the at least one comparison result, including: Within the angular range of each of the check windows, a torque comparison result, a torque rate comparison result, and a torque change rate comparison result are generated by comparing the local torque within the angular range of the torques of the locking curve with the torque range, a torque rate, and a torque change rate defined by the corresponding one of the check windows.

4. The screw fastening inspection method as described in claim 1, wherein the inspection windows further include a pre-tightening inspection window, the pre-tightening inspection window being arranged angularly between the mounting inspection window and the tightening inspection window.

5. The screw fastening inspection method as claimed in claim 1, wherein the inspection result is generated based on at least one comparison result of the local torque within the angular range in which each of the inspection windows of the fastening curve falls, comprising: Based on the comparison result of the local torque within the angular range of each of the locking curves in the check windows, the result is determined to be either a normal check result or an abnormal check result among several abnormal check results.

6. A screw fastening inspection device, comprising a plurality of modules electrically connected to each other, the modules comprising: A first module is configured to acquire a locking curve of several torques relative to several angles measured during a screw fastening process; A second module is configured to set a plurality of check windows in a plurality of angle ranges based on the specifications of the screw, wherein each of the check windows defines at least one parameter range, the at least one parameter range including a torque range, and each of the check windows defines a torque upper limit, a torque lower limit, an angle upper limit and an angle lower limit. The check windows are arranged in ascending angles and include a hole finding check window, a mounting check window and a tightening check window. The check windows are a plurality of window frames formed at a plurality of representative torque inflection points in a reference tightening curve measured by the screw in a normal tightening process. A representative angle in the angle range where a first window frame is located in the ascending angles of the window frames is a hole finding angle associated with an over-limit downward displacement measured by the screw in the normal tightening process. A third module is configured to generate at least one comparison result based on the local torque of the torques of the locking curve within the angle range of each of the check windows and the at least one parameter range; and a fourth module is configured to generate a check result based on the at least one comparison result of the local torque of the locking curve within the angle range of each of the check windows.

7. A screw fastening inspection system, comprising: A central control unit, a controller, and a fastening motor are provided. The controller is electrically connected to the central control unit and the fastening motor. The central control unit includes a processor and a memory. The processor executes a program stored in the memory to configure the processor to: acquire a fastening curve of a screw measured in a fastening process relative to several angles. Based on the screw specifications, several check windows are set in several angle ranges, each of which defines at least one parameter range, including a torque range. Each of the check windows defines a torque upper limit, a torque lower limit, an angle upper limit, and an angle lower limit. The check windows are arranged in ascending angles and include a hole-finding check window, a mounting check window, and a tightening check window. The check windows are several window frames formed based on several representative torque inflection points in a reference tightening curve measured by the screw during a normal tightening process. A representative angle in the angle range where a first window frame is located in the ascending angle arrangement is a hole-finding angle associated with an over-limit downward displacement measured by the screw during the normal tightening process. Within the angular range of each of the check windows, at least one comparison result is generated between the local torque of the torques of the locking curve within the angular range and the at least one parameter range; and a check result is generated based on the at least one comparison result of the local torque of the locking curve within the angular range of each of the check windows.

8. The screw fastening inspection system of claim 7, wherein, within the angular range of each of the inspection windows, the local torque within the angular range of the torques of the fastening curve is compared with the at least one parameter range to produce the at least one comparison result, including: Within the angular range of each of the check windows, a torque comparison result is generated by comparing the local torque within the angular range of the torques of the locking curve with the torque range defined by the corresponding one of the check windows.

9. The screw fastening inspection system of claim 7, wherein, within the angular range of each of the inspection windows, the local torque within the angular range of the torques of the fastening curve is compared with the at least one parameter range to produce the at least one comparison result, including: Within the angular range of each of the check windows, a torque comparison result, a torque rate comparison result, and a torque change rate comparison result are generated by comparing the local torque within the angular range of the torques of the locking curve with the torque range, a torque rate, and a torque change rate defined by the corresponding one of the check windows.

10. The screw fastening inspection system as claimed in claim 7, wherein the inspection windows further include a pre-tightening inspection window arranged at an angle between the mounting inspection window and the tightening inspection window.

11. The screw fastening inspection system as claimed in claim 7, wherein the inspection result is generated based on at least one comparison result of the local torque within the angular range in which each of the inspection windows of the fastening curve falls, comprising: Based on the comparison result of the local torque within the angular range of each of the locking curves in the check windows, the result is determined to be either a normal check result or an abnormal check result among several abnormal check results.

12. The screw fastening inspection system as described in claim 7 further includes a human-machine interface electrically connected to the fastening motor.

13. The screw fastening inspection system as claimed in claim 7 further includes at least one sensor electrically connected to the fastening motor.

14. The screw fastening inspection system as claimed in claim 7, wherein the fastening motor is mounted on a gantry mechanism or a robotic arm.

15. A computer program product, which, when loaded and executed by a computer, enables the computer to perform the screw fastening inspection method as described in any one of claims 1 to 5.

16. A computer-readable recording medium that can read a program stored in the recording medium, which, when loaded and executed by the computer, enables the computer to perform a screw fastening inspection method as described in any one of claims 1 to 5.

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