How to use dynamic torque sensor to realize the accurate control of tight force pre-tightening force

Torque force will cause the foundation bolt fracture, connection parts damage, deformation or fracture and other serious harm; Torque force deficiency can lead to joint displacement, tilt, loose nut, standard even rupture. Torque changes can make the stress change of parts of the mainland, damage to the external thread connection characteristics of vice, reduce the fatigue life of male vice. According to torque sensor manufacturers engineer statistics: 90% of male vice failure is caused by the original torque error. So we must strictly control the size of the torque and integrity. The key of the torque control measures including torque control method, method of torque Angle control, the yield limit control method, ultrasonic method, etc. / torque Angle control method for torque can be controlled within 15% deviation, reasonable deviation to minimize torque. But this kind of control method for complex structure, only within the scope of fittings in the plastic deformation can obtain good control precision. Yield limit control method of torque deviation is small, bolt can be screwed to the yield limit. However, automatic control system is complex, expensive, tighten the special tool to anchor the raw material, structure, and high tempering treatment regulations. Ultrasonic precision measurements can be successfully applied to several inches of anchor, but when the local anchor norms is lesser, due to the environmental harm operator errors will have even more than instruments of pixels in recent years, the shape memory alloy and electronics black spots interference measuring method were used to test torque force, this method USES the capacitive grating electron optical to accurately measure the bias force and resilience. However, due to the price and the limitation of the natural environment, they cannot be applied to the production stage. In high precision external thread parts automatic assembly system software, the provisions of the assembly line system software should be as simple as possible, visualization, high precision working on an assembly line should be in the most simple way. An improved torque control method is proposed: torque/time control. According to the torque in the system software and the time of the relationship between the slope and bending stiffness changes the relationship between the torque and torque are obtained. To different external thread deputy release different torque, to ensure the integrity of torque, keep a small, medium and small male deputy precision assembly line, according to the result of simulation and simulation, verify the feasibility of control measures are analyzed. Torque sensor factory engineer said, at last: because the butterfly spring have large bending rigidity, vibration reduction ability, the advantages of small deformation, large load, suitable for indoor radial space is little, so the high precision male butterfly spring is generally selected as the spring washer in the vice. Time torque control method for torque control can be adjustable in a range of small deviation, and according to the release of different torque to improve the integrity of the torque. Compared with the traditional torque control method, torque time control method can obtain better control effect.

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