US2492544A

US2492544A - Machine for cold-drawing bar stock

Info

Publication number: US2492544A
Application number: US557906A
Authority: US
Inventors: Phillip C Vetter
Original assignee: Great Lakes Steel Corp
Current assignee: Great Lakes Steel Corp
Priority date: 1944-10-09
Filing date: 1944-10-09
Publication date: 1949-12-27
Anticipated expiration: 1966-12-27

Description

Dec. 27,, 1949 P. c. VETTER 2,492,544

v CHINE FOR COLD DRAWING BAR STOCK Filed Oct. 9, 1944 4 She'ets-Sheet 1 Ill C INVENTOR.

PHILLIP C. VETTER WWHMM ATTORNEYS Dec. 27, 1949 'P. c. VETTER MACHINE FOR COLD DRAWING BAR STOCK 4 Sheets-Sheet 2 Filed Oct.' 9, 1944 INVENTOR.

PHILLIP C.VETTER ATTORNEYS FilecP-Oct. 9, 1944 4 Sheets-Sheet 3 Dec. 27,1949 c -r55 2,492,5' 1

MACHINE FOR GOLD DRAWING BAR STOCK .INVENTOR.

PHaLuP OVETTER ATTORNEYS P. c. VETTER momma FOR cow mmwme BAR STOCK 4 Sheets-Sheet 4 Filed Oct. 9, 1944 N 1! ll: I- h uunnunnun nunnl INVENTOR.

PH! LL! P C. VETTER www' ATTOR N EVE;

a m/2,544; MACHINE-FOR'OQIiD-DRAWINGBAR s'ro K Phil in. Qt" V ttcrh T on Mi h, assi nor. to

beams C; C".

Gr at Lakes. st eli n rationt c rse; i h, ornoration ofw Mi an Applicationoctober 9, 1944; Serial'Nol 557,906

z-z ms l..-

The invention relates to.- the cold-:drawing, of bar stock and hasaforitsprincihal-object:therebta-ining ofxa construction ,of machine capable of highproduction; o

More-'particularly; 1137 18 an; object; to; facilitate the exchan ing: of: dies; and; other, parts; by:- a changejnathe-worhitobe nerformedzandrto there;- blh minimize; the; timer. the machine; is, out: 01 aiQti ltle It: is: aa furthen obj eats to. obtain other advan tageous; features: and with: these objects in view the:v invention. consists ins. the, construction; as hereinafterzsetcfonthr In the drawings:

Fig; is; a; side; elevation: of my; improved machine;

cluding bed members A and B at opposite ends thereon ancl, laterally spaced longitudinally extending beams C, C supported upon and extend- 30 ing between, said-i bed members; Travelingly mounted on the frame ,is ,a, push carriage-Diand a draw carriage E. There is alsoadiemounting F fixedly secured to the frame intermediate the carriages: D'r-and E. The: carriage D is reciprocatedbyhydraulic piston motors G, G mounted ongthebed A on opposite sides; of 17118365171136! thereof.;, The piston rods G of theseihydraulic motors arv wdirectly connected to-bracltetsDfon opposite sides of the carriageDiwhichiatteris slidable in ,ways D mounted onjhe bedlA, The carriage E is supported on wheelsiEl' which travel alon guide rails H and H, mounted; on 'the The actuating mechanism for this carriage comprises a pair of revoluble screw threaded rods I, I engaging correspondingly threaded bearings I located in pockets on opposite sides of said carriage. The rods are journaled at their opposite ends in roller bearings I and are revolved by a drive mechanism later to be described.

The function of the carriage D is to first engage the work bar and to advance the same through and beyond the die a sufilcient distance for engagement with the carriage E. From that (Oh ZOE-24) z point: on-.the--bar is =drawn=by the carriage E: until itrpasses completelythrough theldie. Bothtcarariages D and Eare; therefore, provided=with work grippers and; to increase the. capacity Ofrthfi 5 machine,v each carriage has aplurality of such grippers arranged side by side for simultaneously advancing parallelly arranged-work bars-through a} corresponding number of? dies: Each: work gripper J comprises at; pairv of' jaws-aJ'" fashioned l0 initheir gripping faces to correspond to-the work barto beeng-aged: The outer faces J 'of these jaws: are oppositely inclined with. respectv to the longitudinal axis of"- the bar 1 and" each faceengagesa: series ofrollers J arrangedbetweenthe same-anda parallel race member J Springs-J bearing against" the large end of each Jaw urges it in a direction to effect a radia l 'inward move ment-against the bar. The jaws J 4 are flared-at their small ends to receive the end of a- Work mm which; when moved in;thisdirection will shift said I jaws longitudinally against the pres;- sure' of the springs J andwill radially expand themto'receivethe bar; As the; jaws[J"must 'flt*the; work bar which being fed; it is neces- 'sary to exchange said jawswhenever a, change is made in the size of'the work. This is acco nQ- plished by mounting, each gripper unit in a holder K which latter is remoyably mounted in the. carr ag Dio o hisendq a h arria e s rm \izi h. a s ri f. narallelly. arran ed pocke 'sclq, onenat their. upp r dsand a h-et i e o.receivetheholder K- Thesfront and. 1 rear. Wa ls of each no ket are apertured; in

., alignment. withcorresponding aperturesin the holder. K ,andwith therax-is of the. grippersJ. K and.Kiarelexchan fiable guide bushings inserted in, these apertures a d: f: annt nal diameter corresponding, to, the external diameter;- o f, the

0 work. The; bushing; Ki extends: through; both the aperture in the Wal 5 of; the pocket,- and that injthe holder K and ,forms a. u kierhe holder in; its; po ket, Th u hina- Khhowevert ssonly nlthezh lderr a d does: not interier fwith the insertion of withdrawal of the latter from the pocket. Thus, whenever the gripper jaws are to be exchanged, this may be accomplished by first removing the bushing K and then lifting the holder K out of the pocket together with the gripper assembly arranged therein as a unit.

The gripper assembly including the jaws J',.

rollers J and race members J are retained in the holder K by plates J on opposite sides thereof. These plates are secured by screws J" and by detaching one of the plates, the jaws toggle lever M may be removed and replaced by other jaws of the proper size.

The die mounting F is formed by a pair of posts extending upward from the bed A on opposite sides thereof. The inner faces of these posts are grooved at F to receive tongues F on opposite sides of a removable die holder L. The latter is provided with a series of pockets L for receiving the dies L which will be respectively positioned in alignment with the grippers J in the carriages D and E. Preferably each die L is mounted in a semi-spherical member-L and the pocket L is of corresponding spherical shape to receive this member. This permits of accurately aligning each die by rotary adjustment of the member L in the pocket L' which is accomplished by set screws L These set screws threadedly engage a cover plate L detachably secured to the holder L and closing the pocket L. Thus, whenever dies are to be exchanged, the holder L may be lifted out of engagement with the grooves F in the posts F to remove the holder and die as a unit after which the plate L is detached, the die L removed and replaced by an exchange die. This is properly aligned by adjustment of the screws L after which the holder L is replaced.

' It has been stated that the carriage D is reciprocated by the hydraulic motors G and G. Also the construction of the gripper J is such that it :will seize the work during the forward advancement of the carriage and will release it during the return movement. However, it is necessary to hold the work from being frictionally moved rearward with the carriage and this is accomplished by a one-way clutch M mounted on the bed A. The clutch M includes a stationary jaw member M mounted in a frame M while a movable jaw member M is pivotally attached to a A spring M urges the tog lever in a direction counter to the advancement of the work and this movement of the toggle forces the jaw M towards the jaw M. Thus, while the stock bar is free to move through the clutch M in the direction of forward advancement of the carriage D, it will be held by said clutch from any movement in the reverse direction.

My improved machine has a number of auxiliary devices and specific elements other than those thus far described. However, as these form 7 no part of the instant invention, it is not necessary that they should be described in detail. In general, the screw-threaded rods I and I are rotated by a rotary hydraulic motor N through the medium of a gear transmission mechanism not shown. The hydraulic motor N and the motors G and G are controlled by suitable valves and a timing mechanism which causes the carriage D to reciprocate a predetermined number of times, while the motor N is stationary. The motors G, G then remain stationary while the 'motor N operates to rotate the screws I, I and advance the carriage E. During the operation of the reciprocatory carriage D, the stock bars are pushed forward step by step by the grippers J through the dies L and into a position for engagement with the grippers J of the carriage E. The latter carriage is then advanced until the bars are drawn completely through the dies.

In practical manufacture it is frequently necessary to adjust the machine for operation on different sizes of stock bars. It is, therefore, obvious that the output of the machine will be limited by the length of time required for making such exchanges. I have reduced this time to the minimum by a construction which permits of very quickly removing and replacing the holders for both the grippers and the dies; also, by the provision of spare holders so that while the machine is in operation with one set of grippers and dies, exchange grippers and dies may be engaged with a set of spare holders. Thus, when the holders of one set are removed from the machine, replacement by the substitute holders may be quickly effected.

What I claim as my invention is:

1. In a draw bench, a frame, a work advancing carriage mounted for travel on the frame,

, said carriage having a pocket open at its upper end and having an aperture opening into the pocket, a work gripper, a holder containing said work gripper, said holder being insertable into and removable from said pocket through the open upper end and said holder including an aperture aligned with the carriage aperture, and a work guide bushing removably mounted in the aligned apertures in said carriage and holder to lock the holder in the carriage pocket.

2. In a draw bench, a frame, a work advancing carriage mounted for travel on the frame, said carriage having a pocket open at its upper end and having an aperture opening into the pocket, a work gripper, a holder containing said work gripper, said holder being insertable into and removable from said pocket through the open upper end and said holder including an aperture aligned with the carriage aperture, a work guide bushing removably mounted in the aligned apertures in said carriage and holder to lock the holder in the carriage pocket, and a retainer for said bushing in its locking position.

PHILLIP C. VETTER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 295,898 Billings Apr. 1, 1884 335,496 York Feb. 2, 1886 535,534 Dollman Mar. 12, 1895 1,812,359 Moltrup June 30, 1931 1,816,484 Holmes July 28, 1931 2,228,746 Berkebil Jan. 14, 1941 2,404,234 Kerr July 16, 1946