In the mechanical assembly industry, especially in the automotive sector, the quality of threaded fastener assembly in final assembly plants will directly affect the assembly quality and driving reliability of the entire vehicle. The control of assembly torque for screws and error-proofing has become a crucial issue. More and more automotive manufacturers are choosing high-precision electric tools for assembly. Currently, there are various types of electric tightening tools on the market, each with different error-proofing functions. How to fully utilize the functions of electric tools and reflect their value is a very important issue. Today, let's take a look together.Intelligent Electric ScrewdriverCommon error-proofing methods.

1. Statistical error-proofing method

In manufacturing enterprises, it is common for operators to use single-axis electric tightening tools to tighten multiple fasteners or use multi-axis electric tightening tools to tighten multiple groups of fasteners. We can use the tightening quantity statistical method for error-proofing. When using this method, it is necessary to edit the control program (PLC program) of the production line before tightening the fasteners, allowing the electric tightening tool and the PLC program to communicate with each other, and setting the tightening quantity in the control program.

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2. Error-proofing method combining socket selector and tightening sequence

In practical use, we often encounter a situation where a workpiece has several different torque values during the tightening process. At this time, we need to use a task jump program, which tightens multiple fasteners in a certain order. This situation poses a risk of disordered tightening sequences, leading to quality accidents. In this case, we can restrict the usage order of the socket selector in the program. By combining the socket selector with the tightening sequence, we can effectively achieve error-proofing.

3. Angle limitation error-proofing method

Sometimes, even though we have used the quantity statistical error-proofing method, due to the excessive number of fasteners, operators may tighten one or more fasteners repeatedly during the operation, resulting in a sufficient number of qualified counts on the counter, but still some fasteners are not tightened. In this case, we can add angle monitoring to the quantity statistical error-proofing method for error-proofing.

As we all know, when a fastener is tightened, if the intelligent electric screwdriver applies external force to the fastener again, the fastener does not start to rotate at the moment the external force is applied, but needs to wait until the applied external force reaches a certain level before it starts to rotate again. At this time, we can set a very small tightening angle, and each tightening angle must be greater than the set small tightening angle to be counted as a correctly tightened fastener.