US846113A - Manufacture of single-spiral augers. - Google Patents

Description

No. 846,113. PATENTED MAR. 5, 1907,.

I A. KRIEGER.. MANUPAGTURE 0F SINGLE SPIRAL AUGERS.

APPLICATION FILED JAIL 29, 1906.

2 SHEETS-SHEET l ATTORNEYS No. 846,113 PATENTED MAR. 5, 1907.

' A. KRIEGER:

MANUFACTURE OF SINGLE SPIRAL AUGERS.

APPLICATION TILED JAN.29,1906.

2 SHBBTSSHEET 2.

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ANDREW KRIEGER, OF COLUMBUS, OHIO.

MANUFACTURE OF SINGLE-SPIRAL AUGERS.

Specification of Letters Patent.

Patented March 5,1907.

Application filed January 29,1906. Serial No. 298,405.

T 0 all whom it may concern:

Be it known that I, ANDREW KRIEGER, a citizen of the United States, residing at O0- lumbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in the Manufacture of Single-Spiral Angers, of which the following is a specification. 7

My invention relates to a new and useful method of manufacturing angers.

The object of the invention is to provide a method of manufacturing angers comprising a single-spiral body portion having a doublespiral cutting-head at a single operation.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawings, Figure 1 is a face view of one of the half-dies. Fig. 2 is a similar view of the other half-die. Fig. 3 is a rear end elevation of the half-dies in their Fig. 4 is a front elevation of the same. Fig. 5 is a plan view of an auger-blank. Fig. 6 is a plan view of the same after the single spiral has been formed. Fig. 7 is a plan view of the auger after the single and double spirals have been formed. Fig. 8 is a transverse vertical sectional view through the dies, showing in elevation the auger supported during the punching operation and the punch in engagement with the end of the same. Fig. 9 is a side elevation of the punch, the lower portion being shown in section to illustrate the point-receiving concavity; and Fig. 10 is an end view of the punch.

In the drawings the numerals 1 and 2 represent upper and lower halfdies, respectively.

Each of these dies are formed in their faces with semicylindrical grooves 3 and 4, two of such grooves being provided in each half-die and extending longitudinally thereof. These grooves are so disposed that when the faces of the dies are brought together the groove 4 of one die will register with the groove 4 of the other die and likewise the groove 3 will register with the other groove 3, thus providing two cylindrical passages or openings, as shown in Figs. 3 and 4.

The grooves 3 may-be properly designated as roughening-grooves and are only used under certain conditions when it is desirable. I have shown them more especially to illustrate the present method of forming singlespiral angers. Within these grooves the usual curved and rounded ribs or crimps 5 are provided and spaced in the usual manner, so that the grooves 3 provide the necessary spaces therebetween. However, in forming these ribs or crimps I position them so as to leave the forward portion 6 of each groove 3 unobstructed, thereby providing a cylindrical opening of such length as to receive the head or stop portion of the anger and also to provide a gage to guide the operator in forming the single spiral. This ga e is formed by the forward edges 7 of the half-dies and the grooves, and by bringing the extreme end of the tapered point 8 of the anger in line with the said edge 7 the operator will know that he has twisted the bit back through the dies to the right point. By this provision he is not compelled to rely on his judgment and is prevented from running the single spiral into the head portion 11.

In Fig. 5 Ihave shown the usual augerbla'nk, which comprises the enlarged cylindrical body portion 9, the shank 10, and the stock or head portion 11. In forming the auger this blank is headed and placed between the half-dies, which latter are suitably held in a trip-hammer, so as to be quickly separated and brought together in short light strokes. The blank is placed between the grooves 3 and the ribs 5, with its stock portion well forward, so that the first spirals are formed nearer the shank 10. The anger is twisted or turned so that it is run through the dies back and forth, the spiral thus being gradually and continuously formed. As before stated, the operator has heretofore been compelled to use his judgment and guess just how far to run the bit back without running the single spiral into the head 11 but by provision of the cylindrical portion 6 and the edges 7 he is enabled to gage just how far to run the auger back by bringing the tip end of the point 8 in line with the said edges. The auger thus treated is brought to the shape and form shown in Fig. 6, the cylindrical ortion 9 having been formed into the spira 12. It has been customary to reheat the auger and then place the stock portion 11 between dies arranged in a press, which when brought together compress and flatten out the stock. The anger is again heated and clamped between what is known as header-dies. A punch is then brought into engagement with ICC . ribs in the lower half-die 2 and one in the upthe flattened stock and the double or auxiliary spiral, together with the spur and lips formed by compression and upsetting of the stock. However, after going through these operations and being heated three times the auger is not finished, but must be milled, filed, polished, and straightened, and very often the augers .must be discarded on account of flaws and imperfections resulting from the stamping and. upsetting operation.

As I have before stated, the grooves 3 and the ribs 5 may be used, if desired, for heavy work or bringing the blank to the form shown in Fig. 6. However, I prefer to form both the single and double spirals at a single 0 eration and with one heating. In accompl ishing this I provide the grooves 4 with ribs 14, shaped and spaced exactly like the ribs 5, However, the said ribs 14 are positioned at different points along the grooves 4 from the points occupied by the ribs 5. This is done to permit the forward edges 7 of the die at the end of the grooves 4 to be used as a gage and also to allow room for the double-spiralforming ribs or crimps. These double-spiraly forming ribs are indicated by the numerals 15 and 16, there preferably being two of said per half-die 1. The two ribs 1.5 occupy with their inner space or curved recess 17 substantially the same space as one of the ribs 14 so that the single spirals formed by the ribs 14 will pass over the ribs 1.5, engaging the outermost faces or sides of the same. The rib 16 is also disposed so that exactly the same form of recess is formed between its side and the nearest rib 14 as between the said rib 14 and the other rib 14. It will thus be apparent that the single spirals formed by the ribs 14 may be readily run over the ribs 15 and 1.6 without being altered in shape. However, these ribs 15 and 16 are designed for the purpose of forming the auxiliary or double spiral at the head'of the auger and doing away with the usual stamping or pressing operation and the subsequent compressing and upsetting in header-dies.

Since the two double spirals at the head of the auger shown in Fig. 7 are formed in a space equal to that occupied by one of the single spirals, it follows that more stock must be provided at the head of the blank 9 to permit of these double spirals being formed, and it is for this purpose that the enlarged head 11 is provided.

It is to be understood that the blank shown in Fig. 5 is of smaller diameter than the openings or channels through the dies. This is necessary by virtue of the fact that some of the metal of said blank will be pressed out of the grooves and into the ribs 12. The same thing is true of the head 11, grooves being formed in said head to produce ribs between them, said ribs forming the double spirals.

In forming the double and single spirals simultaneously the blank shown in Fig. 6 is placed in the groove 4 of the lower die 2. (See Fig. 2.) The blank is so positioned that the top of its tapered point 8 lies in line with the front edge 7 of the die, while the stock 11 rests on. the ribs 15. It is to be noted that the ribs 15 are not so high as the ribs 14 and are tapered upwardly to a comparativel y sharp edge, which is given a slight twist to facilitate the production of the double spiral. These ribs are also cut on a diiferent radius from the ribs 14. The half-die 1 (shown in Fig. 1) is inverted and placed in the hammer or other machine so as to come down onto the auger and the lower half-die 2. This inverting of the upper half-die causes its ribs 14 to extend diagonally in the opposite direction from the lower ribs, thus providing the single spiral. The rib 16, which is of the same shape and disposition as the ribs 15, extends diagonally across the interspace 17 from the innermost rib and across the outermost rib, thus forming the double spiral. As before stated, the stock 11, resting on the ribs 15, will of course be impinged and impressed by the rib 16 when the upper die is brought down and the ribs 15 also impressed into the stock, the double or auxiliary spiral thus being started. The ribs 14 coact-ing will make the first impressions of the single spirals 12. The operator immediately begins to twist the auger and run the same back and forth, so as to cause the spirals to be formed smooth and continuous,.the dies of course being reciprocated in the usual manner during this twisting operation. By this operation the auger is brought to the form sh own in Fig. 7- and the spirals. both single and double, perfectly formed, so that milling to form the double spiral is obviated. In twisting the auger through the dies it is possible to carry the double spiral back some distance, so that the same may be given considerable length, if desired. This lengthening of the double spiral could be extended to a much greater degree by providing additional ribs 15 and 16, which of course can be done, if so desired.

It will be apparent that the operator may at all times know the exact condition of his work by the gage provided by the edges 7 of the dies. Considerable care must be exercised in twisting or running the auger backward, so as not to bring the rear ends of the auxiliary spirals 18 into contact with the ribs 14, which would result in bending and mashing said spirals. However, when the edge 7 is used as a this cannot occur. While the rearward twist or run of the auger is limited, it may be run or twisted forward as far as desired, as the single spirals 12 will readily ride over the ribs 15 and against the forward side of the rib 16. From the foregoing it is obvious that the auger-blank is reduced or converted from its incomplete form shown IIS in Fig. 5 to the form shown in Fig. 7 by a single continuous operation and with one heatmg.

After the auger has been brought to the form shown in Fig. 7, the halt-dies 1 and 2 or duplicates of the same are placed in a head ing-press or other machine, which is arranged to suitably hold the diesand open and close the same to receive and hold the anger in position. In Fig. 8 the dies are shown in the position they occupy when closed in the heading-press. It will be noted that the auger, although placed in a vertical position as well as the dies, is securely supported at every point, each of the convolutions of the single spiral 12 resting against one of the ribs-14 and the double spirals resting against the ribs 15 and 16. The auger thus being securely held cannot be bent during the heading operation. In carrying out the heading operation or to form the spurs 19 and the lips 20, I provide a heading-punch 21, the latter having such shape and contour as to freely fit within-the cylindrical opening provided by the upper ends of the grooves 4. This punch on its lower end is provided with ratchet-like projections 22 and with a central upwardly-tapering recess 23. ()n diametrically opposite sides and central of the projections 22 spur-forming recesses 24 are provided. This punch is placed in the press and caused to descendon the upper end of the anger, the same of course having the form shown inFig. 7 and being engaged by the punch. As the punch descends the ta-- pered point 8 is received in the tapered recess 23, while the metal in the stock 11 is upset, compressed, and cut, so that the lips 20 are formed by the ratchet-like projections 22 and the spurs 19 by the recesses 24, into which the metal of the stock is crowded or upset during the punching operation.

It is to be observed that the double spiral 18 is securely supported by the ribs 15 and 16 and cannot bend or be forced out of shape during the punching operation. The punch is now withdrawn and the halfdies separated, so as to permit the. removal of the auger therefrom. Very little finishing is re quired, it being merely necessary to sharpen the spurs and lips slightly and carry out the usual polishing and truing operations.

I wish to make it clear that by my process and apparatus the augers are not dropforgedthat is, so far as the spirals are concernedand that the latter are formed by turning the auger back and forth between the halt-dies, which are separated and brought together by quick, short, light strokes, which has the effect of merely tapping the auger, so as to gradually form the spiral.

What I claim is The method of making angers, which consists in forming a blank having a substantially cylindrical body with an end portion of slightly greater diameter than that of the body, die-forging a single-spiral groove in the body, and double-spiral grooves in the enlarged end portion of less depth and width than the groove in the body, substantially as and for the purpose set forth.

In testimony whereof I afliX my signature in presence of two witnesses.

ANDREW KRIEGER.

Witnesses:

A. L. PHELPs, M. B. ScnLnY.

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