Method for producing lamination stacks and application device for an adhesive for performing the method

A method for producing a lamination stack for rotors and/or stators of electric motors or generators, the method comprising:

• applying a light-activated adhesive, activatable by a light of a required wavelength, via a supply line of an application unit to at least one side of electrical steel;
• providing a radiation source with an exposure path having a length extending relative to a longitudinal direction of the supply line;
• providing the supply line, in a region facing the exposure path of the radiation source, with a radiation-permeable region that is permeable to a radiation emitted by the radiation source;
• providing an adjustable cover between the supply line and the radiation source, wherein the adjustable cover is impermeable to the radiation emitted by the radiation source;
• activating the adhesive immediately before the adhesive exits from the supply line of the application unit by irradiating the adhesive with the light of the required wavelength emitted by the radiation source along the exposure path;
• adjusting, as needed, the adjustable cover to shorten said length of the exposure path so that the light of the required wavelength emitted by the radiation source only falls on the adhesive in an area of the radiation-permeable region of the supply line not covered by the adjustable cover;
• subsequently punching laminations from the electrical steel by a punching tool;
• stacking the laminations to a lamination stack, wherein the laminations in the lamination stack are connected to each other by the adhesive.