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Case Studies > Screw Tightening Machine Case Study of Prevention of Screw Galling and Crushing of Screw Heads
Screw Tightening Machine Case Study of Prevention of Screw Galling and Crushing of Screw Heads
Issue: Prevention of Screw Galling
Self-Made screw tightener for in-house equipment. (Made own machine to tighten screws on a specially shaped load.)
Application: Screw tightening
Challenge:
- Too much torque from the motor causes part of the screw threads to break or bite the screw head
- It is necessary to manually check that the screws are tightened, which is inefficient
Solution: αSTEP AZ Series “Push-Motion Operation" Function Ensures Proper Torque Tightening
By using the αSTEP AR Series, it is possible to tighten the motor with adjustable torque to prevent galling. In addition, the status of the motor can be checked by importing the feedback of the travel amount to the upper PLC.
Specific Application Examples
"Push-Motion Operation" Function Limits the Tightening Torque
The torque to be tightened can be limited by setting the push current. During push-motion operation, tightening can be continued without triggering an overload alarm.
When the set torque is reached, the TLC output turns ON.
Do not use push-motion operation with the geared type. Doing so may cause gear damage.
Confirming the status of screw tightening via feedback of the travel amount and TLC output
The built-in rotor position detection sensor enables feedback of the travel amount to the host PLC. By capturing the travel amount and TLC output information, the status of tightening can be checked.
Unified Control of Screw Tightener and Linear Slide
By adopting the EZS Series equipped with the AR Series for the linear slide section, you can unify the control of the entire equipment. The same series of motors and drivers are used to ensure highly accurate and stable synchronous operation.
There are also advantages such as reduced design and start-up labor due to unified wiring, and reduced costs due to unified maintenance parts.
Engineering Notes
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