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Spring-pins are used for ejectors, lifters, and kickers. Spring and/or rod can be cut to length to suit your application. Each spring-pin consists of a hardened steel rod soldered to a compression spring. Looking for Metric sizes?
(See Examples Below) A spring-pin can eject a sheet-metal part after cut-off. This can prevent the sheet metal from being held against the stripper by stamping-fluid surface tension. Spring-pins can prevent slug pulling. This can prevent the slugs from being pulled upward out of the matrix when the die opens. The spring-pins eject the slugs by overcoming the stamping-fluid surface tension which can cause the slugs to adhere to the ends of the punches. A spring-pin can delay the actuation of an electrical switch. Set-screw included.
* All dimensions are in inches if not specified otherwise. Please contact us if you need help or a special size.
Applications
Example 1 : a cut-off die. After a sheet metal part has been cut-off a Nu-Tec spring pin can eject it. The spring on the right shows the sheet metal being pushed away from the stripper. This action can prevent stamping-fluid surface tension from negatively affecting the discarded sheet metal piece.
Example 2 : a notch punch. To prevent vertical movement of slugs out of a matrix after a die opens a Nu-Tec spring pin can push slugs away from the punch ends. Slugs can also adhere to punch ends due to stamping-fluid surface tension. The spring pin has enough force to eject the slugs and prevent this from occurring.
Example 3 : a switch delay. When a mold is partially or completely closed the rod from a Nu-Tec spring pin can apply pressure to a switch. This delays the electrical system from engaging. As shown below, once the mold is completely open the switch is released allowing full functionality. Also, using a spring pin in this manner can be part of an automated system.
