US1901584A - Means for making core laminae - Google Patents

Description

March 14, 1933. C VDALEY 1,901,584

IEANS FOR MAKING CORE WIN}! Filed June 16, 1930 2 Sheets-Sheet 1 lam 464W, tam/1%,

March 14, 1933. J. c. DALEY MEANS FOR MAKING CORE LAMINZE 2 Sheets-Sheet 2 Filed June 16, 1930 10222161 lflliwl Patented Mar. 14, 1933 UNITED STATES PATENT OFFICE JAMES C. DALEY, OF CHICAGO, ILLINOIS, ASSIGNOR TO JEFFERSON ELECTRIC COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS MEANS FOR MAKING CORE LAIMIINE Application filed June 16, 1930. Serial No. 461,434.

This invention relates to the manufacture of laminated transformer cores and the like, and its object is to provide an improved means for blanking or punching out the laminae at an increased rate and with a minimum of waste. i i

The invention provides improved die means for punching or blanking the laminae and improved means for aligning the strip of material and holding it aligned as the laminze are punched or blanked therefrom.

The laminae may be made of sheet iron or any other suitable or preferred material, and the means which I provide enables producing same in large quantities expeditiously, quickly and economically and, as already pointed out, with little waste.

The present invention is an improvement, generally, over the means and method disclosed in my prior patent No. 1,653,152 issued December 20, 1927.

One preferred embodiment of the present invention is illustrated in the accompanying drawings, in which:

Figure 1 is a bottom view of the upper punch and punch holder;

Figure 2 is a top plan view of the lower die and die block;

Figure 3 is a plan view of the end of the strip of material after the first laminae punching step has been performed as the strip is initially fed between the die and punch means of the press, the shaded portions indicating the material punched from the strip;

Figure 4 is a similar view showing the positionvof the punch and die elements in dotted lines and the manner of punching the laminae from the material by the next and succeeding punching and blanking steps;

Figure 5 is a cross sectional view taken on a vertical transverse plane through the upper and lower punch and die means, corresponding to the line 5-5 of Figure 2; and

Figure 6 is a perspective view of one of the laminae formed by the means of the present invention.

Referring to the drawings, each of the core pieces or laminae 5 (Fig. 6) is of general E formation, having a base 6 and three parallel legs 7, 8 and 9 extending parallel with each other and at substantially right angles tothe base 6. The laminae or pieces 5 are'identical and match each other in contour and dimensions. The intermediate legs 8 are disposed centrally between the legs 7 and 9 and are preferably wider than the end legs or tongues 7 and 9, and the bases 6 may be wider than the legs 7 and 9 and slightly narrower than the legs 8, although this may of course vary.

In making up a transformer, for example, the core pieces or laminae are laid up or stacked upon each other with the legs 7 8 and 9 upon each other and the bases 6 alternately at opposite ends. The coil is wound around the intermediate legs 3 and through the spaces between them and the outer legs 7 and 9, the central or intermediate legs 8 forming the core proper for carrying the flux through the coil while the outer legs 7 and 9 and bases 6 form the yoke about the coil. The free ends of the intermediate legs 8 are notched at 10 and the free edges of the bases 6 are similarly notched at 12 for purposes of assembly, the notches 12 being disposed centrally of the bases 6 and in longitudinal alignment with the notches 10.

In producing or making the core pieces or laminae 5 I employ strips 15 of suitable material. Where the laminae are to be used for making transformer cores, or the like, as herein disclosed, they are preferably formed from strips of suitable sheet iron, although of course any other suitableor preferred material may be employed. The strips 15 of material are preferably substantially flat and may, of course, be of any suitable or preferred gauge or thickness. They may in practice be punched cold.

For the purpose of punching or stamping the laminae, the strip 15 is fed by suitable means designated diagrammatically at 16 in Fig. 2 between the upper and lower dies 18 and 20 of a suitable press, the strip 15 being suitably guided and fed over the lower die 20.

The lower die 20 comprises a die block or plate 25 which may be suitably fastened down upon the bed of the press or other support. Suitably secured as by a pressed fit or otherwise in the opening 27 in the die block 25, is

and extend transversely across the the lower die proper 26. One means for guiding the strip 15 may comprlseshoulders or flanges 21 formed on either side of the die 26.

The die 26 is provided with two substantially square die openings 28 and 29, an E- shaped die opening 30 and two elongated rectangular openin 32 and 34 all preferably bounded by re atively sharp cutting or shearing edges, as well understood in the art. The die 26 is, for the purpose of clarity shown as made up in one or an integra piece, but it may of course, in practi e, be made up of a plurality of strips and locks assembled and suitably interlocked in block 25 to form the openings 28 29, 30, 32 and 34. In practice it is usually desirable to avoid an ular pieces in making up the die proper and to make the die up at least as completely as possible of oblong pieces, so that angular cutting edges and corners are avoided.

The strip of material 15 is fed between the die members 18 and 20 in the direction indi-. cated by the arrow in Figure 2. The E- shaped die opening is identical with the E- shaped laminae which it is desired to punch, while the substantially square die openings 28 and 29 conform with the outer marginal contour of said laminae. The openings 28 and 29, it will be noted, each have pro ections 31 and 33, the former correspond ng with the notched opening 12 in each laminae while the latter corresponds to the lateral dimension of the space between the intermediate le 8 and the other le S 7 and 9. In other wor s, the legs of the ie opening 30 are disposed adjacent the legs of the openings 28 and 29, while the bases of the openings-28, 29 and 30 are on oppos1te sides relative to a transverse line drawn between the opening 30 and the openings 28 and 29.

The opening 30 is disposed centrally of the openings 28 and 29 on the side of the die over which the strip of material 15 travels first in its movement between the dies. The bases of the openings 28 and 29 are in alignment ath of travel of the strip 15. The s ace 36 tween the openin s 28 and 29 is o a width equal to the wi th of the middle legs 8 of the laminae 5 and the base of the opening 30 extends transversely across the path of travel of the stock 15 and parallel with the bases of the openings 28 and 29.

The middle leg of the die opening 30 is aligned with the strip of material 36 between the openings 28 and 29 and is of the same width as the strip of material 36, extending from the base of the opening 30 in the same direction as the direction of movement of the strip 15 between the dies. The projections 33 are aligned longitudinally with the legs of opening 30 and the openings 32 and 34, as best shown in Figure 2, the width of the latter openings being equal to the width be tween the intermediate legs 8 and the outer legs 7 and 9. In the embodiment shown the outer legs 7 and 9 of each laminae are of equal width, and the spaces between the central and outer legs are substantial] of the same width as these outer legs. T e bases of the openings 28, 29 and 30 have lips or tongues 53, and the outer end of the central leg of the opening 30 has a tongue 54 for forming thenotches 10 and 12 in the bases and outer ends of the central legs of the lammae 5 as already referred to.

The cooperating upiper punch means 18 is rec1 rocab-e u and own and into and out of t e lower ie openings 28, 29, 30, 32 and 34. It comprises a block 60 in which the upper ends of the upper punch member 62 are suitably secured at 63, and this block 60 is, in turn secured to a block or head member 65 which may be mounted in a suitable punch head or holder for vertical reciprocation. The punch 62 comprises the substantially square punch parts 67 and 68 and the E- shaped punch part 69 which fit in the die openings 28, 29 and'30 of the lower die for up and down movement into and out of said openings and the oblong punch parts 70 and 72 which fit in the lower die openings 32 and 34 for up and down movement into and out of the openings 32 and 34. The punch parts 67, 68 and 69 have notches 74 for cooperation with the tongues or lips 31, 53 and 54 at the openings 28, 29 and 30 of the lower For holding the strip aligned between the unch and die elements and punching alignmg holes in the strip as it is fed therebetween, the upper punch 18 has a pair of'punch pins or posts 76. These pins 76 are secured at their upper ends in the block 60 and the lower die 26 has registering holes 80 for receiving the punch pins 76 as the upper die is depressed into punching cooperation with the lower die. Between the up er punch parts 68 and 70 and rearwardly of the punch part 67 are two aligning and holding pins 82 in longitudinal alignment with each of the punch pins 76 as shown in Figure 1. The lower ends of the aligning and holding pins 82 are preferably tapered and these pins are mounted at their upper ends in the blocks 60 and 65 to yield vertically therein. These pins are more specifically shown and described in my prior patent identified above.

In punching the laminae the strip 15 is first fed in sufliciently to dispose its inner end between the punch part 69 and die opening 30 but preferably not to an extent to be caught by the pins 76 and 80. When the upper punch is depressed into cooperation with the lower die the punch parts 69, 7 0 and 72 and the pin 76 punch from the strip 15 the E-shaped opening 92, rectangular sideopenings 93 and 94, and the aligning opening 95, as best shown by the shaded portions in Figure 3. The material stamped from the opening 92 forms one of the E-shaped laminae.

The following separation of the punch member from the die member releases the strip and it is again fed forward a distance sufficient to bring the opening 95 in position to be engaged by the aligning pin 82, Figure 4 illustrating this position by showing the strip 15 in full lines and the die openings over which the strip is positioned in dotted lines. The material punched from the opening 92 during the initial step forming one of the E-shaped lamina) 5, and from Figure 4 it will be noted that the legs of the open ing 92 and the openings 93 and 94 are so positioned that when the punch is depressed the second time the substantially square punch elements 28 and 29 punch two E-shaped laminae from the portion of the strip around the openings 92, 93 and 94, the material between the intermediate and outer legs of the first E-shaped laminae punched forming the adjacent outer legs of the next two laminae punched and the material between the first laminae and the rectangular openings 93 and 94 forming the intermediate legs of the next two laminae, as will be understood from Figure 4.

Thus, as soon as the strip is completely between the punch and die elements, there are produced on each operation of the press three complete core laminae substantially identical in contour, not only with each other, but also with the core laminae produced on the succeeding operations of the machine. The inner legs of the two last punched laminae interlock transversely between the legs of the previously punched laminae from the opening 92, and the material 97' and 98 left between the legs of the opening 92 on the preceding punching forms the inner legs of the laminae formed on the succeeding punching, as stated above.

One principal feature of my invention is that the tongues 120 extend in a backward direction relative to the direction of advance of the strip 15. When arranged in this man ner any likelihood that these tongues will catch on any projection and be folded during further advance of the strip and eventually jam the machine is reduced.

The strips of material 15 employed are preferably of a width slightly greater than the transverse distance from the outer edge of the die opening 28 to the outer edge of the die opening 29 so that as the laminae are punched or stamped from the material narrow longitudinal retention margins, and transverse strips and the slightly enlarged square portions formed at the end of the central leg of the central opening 92 and at the ends of the central and outer legs of the last formed laminae, together with the strips from the openings 32 and 34 constituting the only waste material in the production of the laminae from the strip 15. The present invention lends itself to the production of the laminae in large quantities, expeditiously, quickly and economically and with little waste, and such little waste as there is retains the strip together after the first laminae have been stamped therefrom so that it may be fed from the machine and removed from between the dies by its feeding movement thcrebetween. Suitable means (not shown) may be provided for stripping the stock from the punch means of the press.

Having thus described one preferred em bodiment of my invention what I claim and desire to secure by Letters Patent is 1. In combination, a die having three die openings, one being E-shaped and two being substantially square, the latter having projections, the E-shaped die having the three leg portions extending towards the other two die openings and its base opposite said two openings, the intermediate leg of said E-shaped die having a width equal to the width of the space between the other two die openings and the outer legs of said E-shaped die opening being adjacent and directly opposite certain of said projections, and a cooperating punch having complementary punch portions movable into and out of the die openings of said die.

2. In combination, a die having three die openings, one being E-shaped and two being substantially square, the latter having projections, the E- haped die having the three leg portions extending towards the other two die openings, the outer legs of said E-shaped die opening being adjacent and directly opposite certain of said projections, two separate die openings on opposite sides of the E-shaped die and having ends lying adjacent and directly opposite other of said projections, and a cooperating punch having complementary punch portions movable into and out of the die openings of said die.

3. A machine for cutting core laminations from a strip of material comprising cooperating punch and die elements adapted for simultaneously punching three grouped E- shaped laminations, said punch and die elements being formed to punch the grouped E-shaped laminations from the material dissed between the outer base edges of two of said laminations at one side of the group and the outer base edge of the other lamination at the other side of the group so that the free ends of the legs of one of said laminations will be adjacent and opposed to the free ends of the legs of the other laminations.

4:. A machine for cutting core laminations from a strip of material, comprising cooperating punch and die elements adapted for simultaneously punching a group of more than two laminations each having a closed side and an open side, said punch and die ing cooperating punch and die elements adapted for simultaneously punching a group of more than two laminations each having a closed side and an open slde, said punch and die elements being arran ed to punch the grouped laminations from t e material disposed between the closed sides of the laminations with the open sides of said laminations adjacent and in o posed relation and with the closed sides 0 the laminations disposed across the path of movement of the strip.

6. A machine for cutting core laminations from a movable strip of material, comprising cooperating punch and die elements adapted for simultaneously punching a group of more than two laminations each having. a closed side and an open side, said punch and die elements being arranged to punch the grouped laminations from the material disposed between the closed sides of the laminations 'with the open sides of said laminations adjacent and in o posed relation and with the closed sides 0 the laminations disposed across the path of movement of the strip, said punch and die elements being also formed to leave narrow strips along opposite sides of the movable strip.

7. A machine for cutting core laminations from a movable strip of material, comprising cooperating punch and die elements adapted for simultaneously punching a group of more than two laminations each having a base side with leg portions projecting from said base sides and free at their outer ends, said punch and die elements being arranged to punch the grouped laminations from the material disposed between the base sides of the grouped laminations with the free ends of the le portions of said laminations adjacent an in opposed relation and with the base sides of said laminations disposed across the path of movement of the strip.

8. A machine of the character described, having means for cutting three E-shaped members from a movable strip, said means being arranged to out two of said members crosswise of the strip with the legs of the E-shaped members extending away from the direction of movement of the strip and the third E-shaped member with its legs interlacing with the legs of said first two E-shaped members.

9. In a machine of the character described, means for cutting laminations having projecting portions from a movable strip, and means for cutting from said strip laminations having a greater number of projecting portions than the laminations cut by said rst means, said last means being arran d to dispose the laminations cut thereby with their (greater number of projecting portions exten in away from the direction of movement of t e strip.

10. In a machine of the character described, means for cuttin laminations having projecting ortions rom a movable strip, and means or cutting from said strip laminations having a greater number of projectin portions than the laminations cut by sai first means, said last means being arranged to interlace the projecting portions of the laminations'cut by said first means with the projecting portions of the laminations cut by said last means.

11. In a machine of the character de-' scribed, means for cutting laminations having projecting portions from a movable strip, and means for cutting from said strip laminations having a greater number of projectin portions than the laminations cut by said rst means, said last means being arranged ahead of said first means in the direction of movement of the strip to dispose the laminations cut by said last means with their greater number of portions extending away from the direction of movement of the strip.

In witness whereof, I hereunto subscribe my name this 13th da of June, 1930.

J ES 0. DALEY.

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