US1704874A - Adjustable die - Google Patents

Description

March 12, 1929. I N. TROYER ADJUSTABLE DIE Filed Dec. 1924 J M m7 M \wm wWw/W U L Q wk M .BY W I Q ATTORNEY ill) Patented Mar. 12, 1929.

UNITED STATES.

PATENT -OFFICE.

NELSON TROYER, OF SEATTLE, WASHINGTON, ASSIGNOR TO SEATTLE ASTORIA IRON WORKS, OF SEATTLE,

WASHINGTON, A CORPORATION OF WASHINGTON.

ADJUSTABLE DIE.

Application filed December This invention relates to die holders and dies: more part icularly it relates to holders tor dies used in connection with reciprocally moving punches t'or notching the edges of metal plates, or for doing similar work; it being the principal object of the invention to improve upon the dies and die holding means of that. general type used in can body forming machines: the dies are mounted at such an anglewithrespectto the linesotniovement ot the punches that. after being shortened incident to sharpening. their cutting edges may be brought bacl; into proper relation to those of the punches by advancing the dies longitudinally in their holders and without changing the angles o'lf clearance between the clearance surfaces of the punches and dies.

To better explain the invention. it will be stated here, that in the machines of the charactcr wherein the present. device is to be used, frequent sharpening of the dies is required. This, then necessitates a readjustment of the dies, after each sharpening operation within their holders. Furthermore the dies are formed with cutting edges extending at an angle with respect. to each other and the punches have corresp'onding edges for moving in shearing relation to thedie edges. In view of these circumstaiures, the gist of the invention, resides in the construction of the dies and in the means for holding them in an angular relation to the line of movement of the punch whereby proper clearance for the shearing action is al the punch surfaces and the two cutting edges of the dies and which provides that the dies, after being sharpened. may be adjusted again to proper relation with the shearing surfaces of the punches by longitudinal advancement in the holders without etlecting any change in the angle of clearance.

Other objects of the invention reside in the details of construction of the holder, the dies. and means whereby the dies may be clamped and held at di-ll erent positions of adjustment.

In accomplishing these and other objects of the invention, I have provided the improved details of construction, thepreferred forms of which are illustrated in the accompanying drawings wherein Figure 1 is a sectional view of a part of a machine wherein a die holder and dies, constructed and assembled according to the present invention, are used.

'ays maintained between 8, 1924. Serial No. 754,649.

Figure 2 is a face view of the holder and dies, also showing in dotted lines, the punches and their holder.

Figure 3 is a vertical section through the die holder, taken on the line 33 in Figure illustrating the angular disposition of the dies.

Figure 4 is a horizontal section, taken on the. line 4lat in Figure :2, showing the cross sectional shape of the dies.

Figure 5 is a perspective view of the die holder; part of the clamping plate being broken away for better illustration.

1*i gurc h is an enlarged cross sectional view of a die and punch.

Referring more in detail to the several views of the drawin 1 designates a vertically 1110Vt1l)l8 punch slide. adapted to be reciprocated vertically by means of a connecting rod 2 that is fixed pivotally, at its upper end, to a laterally extending portion 3 on the back of the slide, and is mounted, at its lower end, on the eccentric journal. of a driving shaft 4. Supported for vertical adjustment on the slide 1 are punches 5. These are held properly in position by clamping plates 6 that overlie them and which in turn are secured by bolts 7 to the slide. The present form of punches have the same cross sectional surface throughout their length and this provides that when sharpened and adjusted downwardly, the relation of their shearing surfaces to those of the dies, presently described, will not be altered.

The punches 5 have shearing surfaces 8 and 9 located at an angular relation to each other, and these, by reciprocal movement of the slide, are brought into cutting relation with the shearing edges of the dies to effect the notches of the edges of sheet metal blanks, one of which is indicated at 10 in Figure 1, that are advanced by means of mechanism, not herein disclosed, into proper position for this operation.

The feature of this invention resides in the construction of the dies and die holder. The holder is designated at 11 and consists of a metal block that may be secured to a supporting member in the machine wherein the parts are used by means of bolts 12 through its ends. It is equipped with two die holding slots '13 wherein dies 14 are slidingly contained and which are adapted to be clamped and held at diiterent positions of adjustment by means of a plate 15. This is secured to the plate 11 by bolts 16 extended therethrough with its opposite ends overlying the dies, as shown in Fig ures 2 and 4. The parts are so arranged and constructed that by tightening the bolts 16, the ends of the plate will be tightly clamped against the dies and they will-be held securely thereby during use.

The die pieces 14 are each provided with two shearing edges 20 and 21 that are formed at an angle with respect to each other. The dies have the same cross sectional area and shape throughout their length and may be ground off or sharpened, and then adjusted upwardly and their shearing edges Will always maintain the same relation to the punches regardless of the adjustment.

To prov1de the necessary clearance between the shearn'n surfaces of the (lies and the b punches, the grooves wherein the dies are held are formed at an angle with respect to the line of movementof the )unches' that is, the

grooves converge toward their lower ends, as

is shown in Figure 2. and also are inclined toward the back of the block wherein they are mounted, as shown in Figure 3. This angle provides that the plane of the clearance surface 21 of the die lies at an angle with respect to the plane of the shearing surface 8 ot the punch and likewise, the plane of the clearance surface 20 of the die is at an angle with respect to the plane of the punch surface 9. Thissame angular relation of the die and punch surfaces is always maintained regardless of any adjustmentot the dies and it makes possible a'longer use of the dies than is ordinarily possible since it is only necessary,

after sharpening off the ends of the die, to

edges formed at an angle with respect to each other, a die having corresponding edges and a die holder wherein the die may be longitudinally advanced and wherein it is held at such an angle with respect to the line of travel of the punch to maintain the same angles of clearance between its clearance surfaces and those of the punch for all positions of adjustment.

2. In combination with a reciprocally moving punch having shearing cutting edges formed at an angle with respect to each other, a the hea ing corresponding edges, a die holding block having a slot formed therein at an angle with respect to the line of movement of the punch wherein said the 1s fitted for longitudinal adjustment and is retained in position to provide the same angle of clearance between its clearance surfaces and those of the die at all positions of adjustment and a clamping plate fixed to the holding block and bearing against the die to retain it functionally at any set position.

Signed at Seattle, King County, Washington, this 2nd day of November, 1928.

NELSON TROYER.

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