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Publication numberUS840426 A
Publication typeGrant
Publication dateJan 1, 1907
Filing dateOct 3, 1904
Priority dateOct 3, 1904
Publication numberUS 840426 A, US 840426A, US-A-840426, US840426 A, US840426A
InventorsOtto Briede
Original AssigneeOtto Briede
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Metal-swaging apparatus.
US 840426 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

PATENTB D JAN. 1, 1907.


APPL IOATIONI' ILED 0013.3, 1904.


I w/i/im u,



Specification of Letters Patent.

Patented Jan. 1, 1907.

Application filed October 3, 1904. Serial No. 227.073.

' by means of oscillatory swaging-dies, which progressively act on the hollow billet from one end to the other while seated on a mandrel and work it down to a tube. In swaging-mills intended for such work it has been found that the swaging-dies, with the mandrel, mandrel-stem, &c., together with the billet, must move at high speeds and with quick reversal in opposite directions, and being necessarily somewhat heavy in construction they acquire in each movement a considerable momentum, the effects of which it is important to guard against. Ithas also beenfound that if the cushioning-springs heretofore ordinarily employed are adjusted as respects their tension so as pro erly or in the best manner to do their wor of cushioning and feeding it is difficult-to so proportion or adjust them that they shall also act with sufficient efliciency and at just the right time so as satisfactorily to check the momentum of the heavily-constructed swaging-dies which are employed in the work. Hence in the present invention, in addition to the usual cushioning-springs, (also employed for feeding,) I add to each of the swaging-dies a suitable mechanism, preferably of the dash-pot order, in such manner that it will furnish the proper resistance to momentum as each die comes to the-end of its stroke in either direction and at the same time furnish little or at least a minimum resistance to the movement of the dies, while performing their intermediate swaging function. To this end the present invention consists in the features of construction and combination hereinafter set forth and claimed.

In the accompanying drawings, in two sheets, Figure 1, Sheet 1, represents, partly in side elevation and partly in section, the principal operative mechanisms involved herein with the swaging-dies at or-near the end of their forward stroke. Fig. 2 is a like view illustrative of the position of thedethe middle each way.

vices at the middle of the stroke. Fig. 3, Sheet 2, by a like view, illustrates the condition of things at or near the end of the back stroke. Fig. 4. is an end view, partly in section, of the machine; and Fig. 5 is a detached top view of the dash-pot and a part of the housing attachment.

In a suitable housing or frame 50 and by meansof shafts and bearings of the ordinary or any desired construction are mounted a pair of swaging-dies 1, each having a grooved face 2, which may taper in one direction, as in Patent No. 741,301 granted to me, or, as illustrated in the drawings, may taper from The hole formed by the grooves 2 at the delivery end should be of the exterior diameter of the tube to be made, and the hole at the other end is of preferably somewhat greater diameter. The middle portion of the grooves should give an opening somewhat greater yet, but preferably less than that of the unreduced part of the billet 3; otherwise the grooves should be made and proportioned with reference to the work to be donethat is, to the reducing of the hollow billet 3 to a tube by the progressive or step-by-step action of the dies thereon as the billet is fed forward at the end of each stroke, andfor this purpose of feed suitable provision should be made, as by slightly enlarging or rounding off the corners of the grooves at their extreme ends, just enough temporarily or for an instant to relieve the bite, as set forth in other pending applications.

Each billet 3 being properly heated is slipped onto a mandrel 20, and the latter is coupled to 'a mandrel-stem 21, which latter plays back and forth through suitable guides or bearings 22 and carries cushioning-springs 23 24, one on each side of afixed collar 25, these springs abutting against the guides 22. The rear spring 24 should also have the capacity of effecting the forward feed of the billet at the ends of the die-strokes. Mechanisms for advancing and intermittently rotating the mandrel-stem are to be employed, as set forth in other pending applications, but are not illustrated here, as they form no part of the present invention. The back-andforth movement of the billet, mandrel, and mandrel-stem is effected by the dies, which normally have and retain a bite on the billet except at the very brief moments of feed.

The dies 1 are heavy and normally moving at high speed acquire in each stroke a considerable momentum. Necessarily the springs in any suitable way, as

23 24 check a portion of this momentum; but it has been found in practice that instead of relying solely on these springs for such work it is better to provide the dies by direct connection with a momentum-checking mechanism which in doing this work shall be auxiliary to the cushioning-springs. To this end Ihave provided each of the dies with a dash-potl of which is coupled by a stem 11,to an arm 4:, connected to or made integral with the die and projecting in such direction from the die-shaft 5 as under dash-pot action will give the desired check on the momentum of the dies at or toward the ends of their strokes, along with a materially lessening or disappearing eflect at the middle.

As the construction of suitable dash-pots and the roper materials to be used therein are well own in the mechanical arts, I do not need to describe them in detail. Any one suitable for the purpose may be employed, and I include herein its known mechanical equivalents.

I claim herein as my invention- 10, the moving member I 1. In a machine for swaging metal tubes from hollow billets, the combination of r grooved oscillatory swaging-diesa mandrel reciprocated in both directions by the dies,

and dash-pots coupled to the dies at points movable to and fro past a plane passing 1 through the centers of oscillation of the dies, substantially as and for the purposes set forth.

2. In a machine for s'waging metal tubes, the combination of oscillatory swaging-dies, a mandrel movable back and forth in both directions synchronously with the dies, and momentum-checking mechanism connected directly to the dies at points movable to and fro past a plane passing through the centers of the oscillation of the dies, substantially as described.

In testimony whereof I have hereunto set my hand.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2654277 *Feb 26, 1949Oct 6, 1953Eaton Mfg CoMachine for making and forming turbine blades
US2766645 *Aug 20, 1952Oct 16, 1956Gen Motors CorpGap rolling method
US3874214 *Apr 16, 1973Apr 1, 1975Racicot AndreMachine for corrugating a trough-shaped metal strip
US4538440 *Jul 24, 1984Sep 3, 1985Acco Babcock Inc.Roll swage device
DE1207772B *Apr 6, 1961Dec 23, 1965Sundwiger Messingwerk Vorm GebVerfahren und Vorrichtung zum Warmverdichten von Baendern aus Metallpulver
Cooperative ClassificationB21B1/42