Method for preventing bolt tightening from being missed
A technology of bolts and corners, applied in the direction of program control in sequence/logic controllers, motor tools, manufacturing tools, etc., can solve problems such as counting errors
Active Publication Date: 2015-11-11
CHINA FIRST AUTOMOBILE
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for preventing bolts from being tightened incorrectly by simultaneously monitoring the torque and rotation angle to prevent bolts from being tightened incorrectly and solving the problem of counting errors caused by repeated tightening of the same bolt
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Embodiment 1
[0020] There are 12 exhaust manifold bolts in total, and the bolt tightening torque is 60±5N·m, and they are tightened with electric tools at the same station. Set the initial torque value of the angle of rotation to 50N m, collect the value of the angle of rotation of the bolt when the bolt torque is qualified, analyze the obtained data, and obtain the distance between the initial torque value of the angle of rotation (50N m) and the final torque (60N m) of the bolt. The reasonable rotation angle between them is 8-35°. When the tightened bolts are repeatedly tightened, the tightening torque of the electric tool can reach 60±5N·m, but the rotation angle value is lower than 8°, the program will judge that the bolts are tightened unqualified, and will not count, so as to prevent the bolts from being tightened.
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The invention relates to a method for preventing bolt tightening from being missed. The method is characterized by including the steps that step1, the initial angle torque value of a bolt is set for an electric tool, the turn angle distribution of the bolt from the initial angle torque value to a final torque value is monitored, a confidence interval is set, and the turn angle range of the bolt of which torque is qualified is set on the electric tool; step2, in the process of tightening the bolt, the final torque and turn angle of the bolt are monitored at the same time; after the bolt is tightened, whether the final torque of the bolt is within the set range or not is judged, if not, it is judged that tightening is not qualified, and if yes, whether the turn angle of the bolt is within the set turn angle range is judged; if the turn angle of the bolt is within the set turn angle range, the turn angle is effective data, the number of tightening the bolt is increased by one, and otherwise, in the process of repeatedly tightening the same bolt, the number of tightening the bolt is not adopted. When the number of tightening the bolt meets the calculation requirement, it is judged that assembling is qualified, and otherwise it is judged that assembling is not qualified. The torque and turn angle of the bolt are monitored at the same time, in this way, bolt tightening is prevented from being missed, and the problem that counting errors occur in the process of repeatedly tightening the same bolt is solved.
Description
technical field [0001] The invention relates to a method for controlling the tightening quality of bolts by an electric tool, in particular to a method for preventing missing tightening of bolts, and belongs to the technical field of assembly technology in the automobile industry. Background technique [0002] In the automotive industry, bolted connections are the primary connection method for part-to-part assembly. In order to prevent bolts from being tightened, electric tools (with the function of communicating with PLC) are usually used in the industry to tighten bolts, and the qualified torque counting function is set in the PLC control program to record the number of bolts with qualified torque. When the qualified torque reaches the number set in the program When the specified count value is reached, the program judges that the assembly is qualified, otherwise it judges that it is unqualified. [0003] The existing technology has the following disadvantages: in a stati...
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IPC IPC(8): B25B21/00G05B19/04
CPCB25B21/00G05B19/04
Inventor张俊雄史胜祥平志谦孙吉利陈磊
OwnerCHINA FIRST AUTOMOBILE