Method of preparing transformer cores without waste
AssigneeTranceria Ligure S.R.L.
InventorAlessandro Merlano
Life of this patent
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Abstract
Fast and economic process to prepare, without waste, E-I or U-I shaped transformer cores consisting of laminations (1, 2-9,10) that are directly stacked during blanking and are permanently jointed by punched zones (5,5'). Each free end of the E (1) or U (9) shaped laminations has a profile, snap-joint matching the profile (4,4') of the lamination in front of it (2,2) so as to permit their rigid fixing. The laminations are obtained from a steel strip (11) using a discontinuous feed cutting machine from one processing station to the next.
Claims7
A method for the preparation of E-I transformer cores, with minimized waste, wherein the transformer cores comprise lamination stacks of blankings from a steel sheet, in the form of co-fitting E-I elements, with each of the E elements comprising two outer and one central co-extensive parallel horizontal legs interconnected with a vertical element, said method comprising the steps of:
- a) forming a blanking in the form of two E elements of substantially equal height, integrally connected to each other at the respective free ends of their three parallel legs, with the vertical elements of the two E elements being parallel and wherein the distance between the vertical elements is substantially equal to the height of the E elements;
- b) removing first and second I elements from the blanking from which the connected two E elements are formed, with a first I element being removed from and comprising the area of the blanking longitudinally defined by the parallel vertical elements of the two connected E elements and laterally defined by adjacent connected central and a first pair of outer legs, and with the second I element being removed from and comprising the area of the blanking longitudinally defined by the parallel vertical elements of the two connected E elements and laterally defined by adjacent central and the other of the connected outer legs;
- and
- c) separating the E elements to obtain two pairs of E-I elements;
- and
- d) forming the E-I transformer core from the pairs of E-I elements;
- wherein the improvement comprises providing each pair of E-I elements with interconnection means between the E and I element thereof, with said interconnection means comprising snap co-fitting protuberances and recesses at the free ends of one or more of the E element and in a cofitting side of the I element, wherein protuberances are formed in the E element legs by forming a co-fitting recess in the adjacent legs of the other E element, with the separation of the E elements;
- and wherein protuberances in the I elements are formed by forming a co-fitting recess in an E element leg during forming and removal of the I element from the blanking adjacent thereto, and wherein recesses are formed in an I element by removal of material therefrom.
A method for the preparation of U-I transformer cores, with minimized waste, wherein the transformer cores comprise lamination stacks of blankings from a steel sheet, in the form of co-fitting U-I elements, with each of the U elements comprising two co-extensive parallel horizontal legs interconnected with a vertical element, said method comprising the steps of:
- a) forming a blanking in the form of one or more sets of two U elements integrally serially connected to each other, with the respective free ends of the parallel legs of one U element being integrally connected with the vertical element of the other U element, whereby respective vertical elements of the U elements are parallel and wherein the distance between the vertical elements is substantially equal to the height of the U elements;
- b) removing I elements from the blanking from which the connected two U elements are formed, with each of the I elements being removed from and comprising the area of the blanking longitudinally defined by the parallel vertical elements of two connected U elements and laterally defined by the parallel legs of a U element;
- and
- c) separating the U elements to obtain pairs of U-I elements;
- and
- d) forming the U-I transformer core from the pairs of U-I elements;
- wherein the improvement comprises providing each pair of U-I elements with interconnection means between the U and I element thereof, with said interconnection means comprising snap cofitting protuberances and recesses at the free ends of the U element and in a cofitting side of the I element, wherein protuberances are formed in the U element legs by forming a co-fitting recess in the adjacent vertical element of the other U element, with the separation of the U elements;
- and wherein protuberance in the I elements are formed by forming a co-fitting recess in the leg of the U element during forming and removal of the I element from the blanking adjacent thereto and wherein recesses are formed in the I element by removal of material therefrom.
Dependencies are inferred from the claim text.