This is also called ‘Volute spring’ or ‘Taper rolled flat spring’.When the applied area is narrow for the ordinary compression spring or requires more flexibility, this will be very useful.
The parts that connect pipes with joints so called locking springs have 2 ways of processing. The 2 parts on the right in the image have been processed in calking pins and the one on the left side has been processed with drawing. In the ways like these, we are capable to process the materials in the different ways by budget and purpose.
They are stainless steel parts for a medical appliance. Upon sequential pressing processes, when particular parts are processed continuously, they may cause burr. In order to prevent this kind of defect, we process ‘matching’ , which appears on the image as hollow part on the image on the left.