US1986021A - Holder for wire drawing dies - Google Patents

Description

Jan. 1, 1935. o. SJOGREN HOLDER FOR WIRE DRAWING DIES Filed July 8, 1935 2 Sheets-Sheet l Patented Jan. 1, 1935 UNITED STATES PATENT. 4 OFFICE HOLDER FOR wmE DRAWING 'nms Oscar Sjogren, Auburn, Mass.

Application July 8, 1933, Serial No. 679,478

3 Claims. (01.205-25) This invention relates to dies for drawing wires of small diameter and particularly to holders for such wire drawing dies. Dies for this purpose were formerly made by mounting a diamond in a suitable die block and drilling a fine hole therethrough.

More recently, special steel alloys have been used in place of dies and have been found quite satisfactory as long as the temperature of the die is not unduly raised. If a steel die becomes highly heated, however, the life of the dieis greatly shortened and the quality of the wire is much impaired.

While the desirability of operating the steel dies at relatively low temperature has been recognized, much difliculty'ha been encountered in maintaining this operating condition, due to the necessarily 'heated state of the wire itself and also due to the heat generated by friction as the wire is drawn through the die. a

It is the general object of my invention to provide means for cooling the die andfor maintaining a uniform'and relatively low temperature of the die during wire drawing operation thereof.

More specifically, I provide for cooling the die by circulation of water through the die block holder. I also provide improved devices for securing the die block in the holder and for accomplishing easy and rapid removal and replace- 30 ment of the die block in the holder.

My invention further relates to-arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appended claims.

35 in the drawings, in which Fig. 1 is a plan .view of wire drawing mechanism embodying my invention; r

Fig. 2 is a plan view of my improved die block 10 holder;

Fig. 3 is a sectional plan view thereof; Fig. 4 is a plan view of the holder with the clamping means removed;

Fig. 5 is a side elevation of the holder; I I Fig. 6 is a transverse sectional view, taken along the lines 66 in Fig. 4;

Fig. '7 is an enlarged transverse sectional view of the die block, the holder and the clamping means; i1

Fig. 8 is an end view of theclampin'g means; Fig. 9 is a plan view of the die block and die;

Fig/l0 is a transverse sectional view, taken along the line 10-"10 in Fig. 9; 1

'Fig. .11 is a longitudinal sectional viewof the 55 clamping device;

. is drawn to reduce it to a desired size.

,A' preferred form of the invention is shown Fig. .12 is a detail view of an end portion of the clamping screw, partly in section, and

Fig. 13 is an enlarged view showing the manner of assembling certain of the parts .shown in Fig. 12. 5

Referring to Fig. 1, I have shown a wire W passing successively through wire drawing devices A and B and around intermediate guide pulleys 18. Each wire drawing device A'or B comprises a die 20 (Fig. 10) mounted in a recess in a die block 10 21. These dies 20 are commonly formed of a special steel alloy which is extremely hard and of great durability. The usual small opening 22 is formed in the die 20 through which the wire W 15 A holder 24 is provided for the, die block21. This holder is provided with a chamber 25 (Fig. 7) and also with aligned openings 26 and 27 and with a recess 28. The opening 27 is of greater diameter than the die block 21 and the die block 0 fits loosely in' the recess 28 and is centered thereby with the opening26. An inlet pipe30 and an outlet pipe 31 are connected to the chamber a 25 as shown in Fig. 3 and a partition 32 is provided between the inlet and the outlet. 25

This partition 32 has an outwardly curved surface 23 which deflects the water or other cooling liquid so as to give it a rotary motion, and which also reduces the flow opening around the end of the partition so as to increase'the speed of the 30 liquid as it engages thedie.

A special clamping device is provided for securing the die block 21 in operative position in the holder 24. For this purpose I provide a bushing 40 (Fig. 11) threaded to receive a clamping screw 41 and provided with outwardly projecting clamp-g ing flanges 42. These flanges have helical outer faces 43 (Fig; '7) which engage ears or projections 45 on the holder. These ears have helical inner faces 46 corresponding .tothe faces 43.

The flanges 42 and projections 45 are both segmental and constitute quick-acting means for securing the bushing 40 in the holder 24. This op-,

eration is readily accomplished by turning the flanges 43 to a transverse position and moving the 46 bushing axially inward until the under faces of the flanges 42 engage the outer surface of the I holder 24. If the bushing is then turned, the flanges 24 engage the projections and firmly seat and hold the bushing in position. The bush- 60 ing 40 is provided with a portion 48 towhich a wrench may be applied forfirmly seating the bushing and the clamping screw 41 is similarly provided with a portion 49 to receive a wrench.

'The clamping screw 41 is threaded into the end of the screw 41 is preferably provided with a wear plate (Fig. 12) which may be of a relatively soft metal and which directly engages the die block 21.

The screw 41 and wear plate 50 are provided with axial passages for the wire and a bushing 52 is preferably mounted in a recess 53 in the outer end of the clamping screw 41 so as to properly guide the wire at the outer end of the bushing. 7

In Figs. 12 and 13 I have shown a convenient manner of assembling the screw 41 and wear. plate 50. A recess (Fig. 13) is formed in the outer end of the screw 41 and is provided with an under out side wall. The wear plate 50 is preferably formed with a pronounced outward curve or dish and fits snugly within the outer edge portion of the wall of the recess 60.

The wear plate 50 is then flattened by a blow or pressure thereon and this flattening of the wear plate causes the edges of the plate to be forced outward into the undercut recess 60, thus securing the wear plate from displacement but permitting its removal when it becomes worn and a new wear plate is desired.

With the construction above described, a'die block 21 may be very-quickly and easily secured in position by inserting and seating the bushin 40, and then applying pressure through the clamping screw 41 to cause the wear plate 50 to firmly engage the die block 21 and to seat the same firmly in the recess 28.

When the parts are thus assembled, there is a free and continuous passage through the holder for the wire W, while at the same time the die and die block are water-cooled but without permitting any escape of water from the holder exofi valve 73. The pipes and 71 are also pro-V vided with shut-off valves 74 and '75.

Under normal operating conditions, the valves '73 in the supply pipe 72 will be closed and the valves '74 and 75 will be open so that the water will flow successively through each die block holder in series. If, however, it is desired to remove the die in a selected holder, that particular holder may be out out of the circuit by closing the valves '74 and '75 and opening the valve 73, after which the selected die holderis out of circuit while the remaining die holders of the series operate as usual and the water supply thereto is not interrupted.

While it is preferred to use water, it is to be understood that any other suitable cooling liquid may be used.

Having thus described my invention and the advantages thereof, I do not wish to be limited to the details herein disclosed, otherwise than as set forth in the claims, but what I claim is 1. Wire drawing means comprising a die block, a holder therefor, said holder having a cooling chamber, means to secure said block in said chamber, means to conduct a cooling liquid to and from saidchamber, and means in said chamber to separate the in-fiow and out-flow of liquid in said chamber, said means also reducing the cross section of the passage for liquid at one point thereof and correspondingly increasing the rat of liquid flow at said point.

2. Wire drawing means comprising a 'die block holder having a cooling chamber with an inlet 1 one of said openings, a bushing, quick-detachable means to secure said bushing in said second opening, and'a clamping member threaded in said bushing and engaging said die block.

3. Wire drawing means comprising a die block holder having a cooling chamber with an inlet and outlet for a cooling liquid and with aligned openings in two' walls thereof, a die block seated in said chamber and aligned with and covering one of said openings, a bushing, quick-detachable means to secure said bushing in said second opening, and a clamping member threaded in .said bushing and engaging said die block, said clamping member having an axial guiding opening for the wire.

OSCAR SJOGREN.

Images