Method of making a current breaker
A current breaker for automotive safety systems has a separating punch and a conductor formed with at least one localized decrease in thickness constituting a weakened separating point severable by the separating punch. This current breaker is made by overmolding the conductor in a plastic-injection mold with an encapsulation by a method having a first step of forming the separating point of the conductor in the plastic-injection mold before or during overmolding and a second step of forming with the mold above and below the conductor in the encapsulation a passage fully exposing the separating point and dimensioned to hold the separating punch.
1. A method of making a current breaker for automotive safety systems having a separating punch, the method comprising the steps of:
positioning a conductor and two cores in a mold,
overmolding the conductor and the cores in the mold with an encapsulation while forming with the cores passages extending oppositely away from a central part of the conductor in the encapsulation,
with the cores in the passages, forming the overmolded conductor in the mold with a localized decrease in thickness constituting a weakened separating point during the overmolding, and
removing the cores from the passages and then providing in one of the passages a separating punch for severing the conductor at the separating point.
2. The method according to claim 1 , wherein the separating point is made by closing the plastic-injection mold with the cores.
3. The method according to claim 2 , wherein the separating point is made by displacing a center part of the conductor relative to flanking side parts thereof with the cores.
4. The method according to claim 3 , wherein after the overmolding a remaining residual wall thickness between the side parts of the conductor and the offset center part is at most 1 mm.
5. The method according to claim 2 , wherein the cores form respective spaces flanking the conductor in the encapsulation and form the passages.
6. The method according to claim 1 , wherein the conductor is made of copper, a copper alloy, aluminum or an aluminum alloy.
7. The method according to claim 1 , further comprising the step of:
before the encapsulation, forming bores in the conductor.
8. The method according to claim 7 , wherein the bores extend through the conductor.