There is "Screw fastening technology" as one of representative assembly element technology, along with the "Swaging technology". Fundamental technologies required for automating screw fastening process are explained below.

(1) Configuration of screw fastening automation

In order to automate screw fastening, system configurations including the processes before and after the screw fastening process will need to be clarified. The automation configurations of screw fastening processes can be classified as follows.

(2) Troubles related to screw fastening automation

Major problems regarding screw fastening automation are organized into above three functions as below. Therefore, the measures below are needed to be incorporated in the automating process.

1) Troubles related to screw parts feeding

	(1)	Jamming of automated screw parts feeder
	(2)	Screw parts chucking errors (miss-chucking, dropping)
	(3)	Defective screw parts (Accuracy defects, burrs, type mixture, magnetization)

2)Troubles related to automated screw fastening

	(1)	Abnormal fastening force (Insufficient or excessive fastening force)
	(2)	Abnormal stoppage due to defective parts feeding
	(3)	Malfunction of positioning unit

3)Troubles related to screw fastening quality inspection

	(1)	Loosening
	(2)	Over-tightening
	(3)	Appearance defects (Scratches, bending, tilting, etc.)

60% of the troubles are caused by screw parts feeding errors and automated fastening process errors.