Solutions
Electrical & Electronic
![](../assets/img/img_mv-1_sm.png)
Precise screw tightening
Two robots work together to transfer the flexible workpiece (FPC: flexible printed circuit) and tighten the screws. Force sensors are used to detect position shifts and abnormalities to prevent damage.
Precise screw tightening example
![Start Button](../assets/img/play_mark.png)
![](../assets/img/mv_screw_normal.png)
Solutions to the Issues
![](../assets/img/ic_kadai.png)
Issues
More robots with greater flexibility are being utilized in screw tightening processes, which are often part of the manufacturing processes in the electrical/electronics industry. Consideration is also increasing for the automating complex operations using multiple robots.
![](../assets/img/ic_kaiketsu.png)
Solutions
- Two robots work together to transfer the FPC (flexible printed circuit).
- Robot takes out a screw from the screw supply machine.
- Vision sensor checks the workpiece position.
- Robot calculates the work position internally using vector calculation method and moves the screwdriver tip close to the compensated position.
- Force sensors detect positioning error and control the pressing force during screw tightening.
- Electric screwdriver mounted near tip/flange of the robot tightens the screw.
- Interference between multiple robots or with surrounding equipment is automatically avoided throughout the above process.
Points
- 【Co-rotation prevention】
- Screw tightening is performed while maintaining position of lightweight workpiece.
- 【Angular operation supported】
- Screw tightening from various angles is supported by freedom of the 6-axis robot.
- 【Synchronized motion with screw insertion】
- Force control is utilized to maintain constant pressing force even while tightening the screw.
- 【Flexible material transfer】
- Lightweight flexible workpieces (FPCs, etc.) are transferred and positioned by multiple robots.
- 【Interference avoidance】
- Programless interference avoidance is achieved through real-time monitoring.
- 【Precision product/screw hole protection】
- Force sensors detect abnormalities and stop motion to prevent product damage.
When an abnormality occurs due to positioning shift
![Start Button](../assets/img/play_mark.png)
![](../assets/img/mv_screw_abnormal.png)
Hole position shift caused by faulty workpiece.
Force sensors detect abnormality and prevent the screw from being tightened in the wrong position, protecting the product.