US2559207A - Extruding press - Google Patents

Description

A. F. WN UK EXTRUDING PRESS July 3, 1951 5 Sheets-Sheet 1 INVENTOR.

AnzlzanyFWm/' A TTORNEY Filed July 24, 1946 A. F. WNUK EXTRUDING PRESS July 3, 1951 3 Sheets-Sheet 2 Filed July 24, 1945 INVENTOR.

Anillo BY nyf' 'TTURNEY July 3, 1951 A. F. wNuK 2,559,207

' EXTRUDING PRESS Filed July 24, 1946 3 Sheets-Sheet 3 INVENTOR.

Anlcmf Wnuk BY v l I A TTORNE'Y Patented July 3, 1951 EXTRUDING PRESS Anthony F. Wnuk, Brooklyn, N. Y., assignor to Victor Metal Products Corporation, Brooklyn, N. Y., a corporation of New York Application July 24, 1946, Serial No. 686,015

4 Claims.

This invention relates to presses for extruding slugs into collapsible tubes by impact extrusion and particularly to the means for feeding the slugs successively into the die.

In that type of slug feeding mechanism wherein a slug-holding hopper is secured to and reciprocated with the crosshead of the press, the slugs are agitated sufficiently to enter a slug tube, from the bottom of which one slug at a time is removed and transferred to the fixed female die of the press. Owing to the necessity for removing the extruded tube from the male die or punch after the extruding operation and the need for suiiicient space in the machine for that purpose, the hopper and its delivery tube cannot be arranged closely enough to the dies to feed the slugs directly thereinto, and consequently the slug must be moved a substantial distance by separate mechanism into the die in timed relation to the reciprocation of the cooperating punch. Since the press operates at relatively high speed, correspondingly timed movement of the successive slugsy to the die has been accomplished by relatively fast moving reciprocating mechanism operated by connections to moving parts of the press.

Considerable difficulty has been experienced with such slug feeding mechanism by reason of the momentum attained thereby and imparted to the slug, frequently causing failure of the mechanism to deliver the slug accurately to its exact required position in the die by overrunning or underrunning the die. Such delivery failure results in the cutting of the slug in two by the reciprocating punch with consequent waste of time and material and danger of damage to the press parts and dies.

' I have found that by decreasing substantially the speed of transfer of the slugs and the length ojf the transfer, not only is dependable and acrection by a cam to move the slug just enough to clear the delivery tube of the slug hopper, whereby the speed of the slide may be maintained at a minimum and the slug may be advanced by succeeding slugs finally to drop accurately and dependably into its correct position in the die.

curate transfer obtained, but the transfer mech- The invention further contemplates the provision of a slug runway from the delivery tube to the die, the runway being adjustable to receive slugs differing in diameter, and of means cooperating with the runway for insuring the delivery of the slug in its correct position to the die.

The invention further contemplates the provision of an overflow cup on the delivery tube adapted to receive slugs mispositioned in and rolling out of the tube and likely to interfere with the proper operation of the mechanism.

The invention further contemplates the provision of slug feeding means readily interchangeable with similar means to adapt the press to make tubes of different sizes from slugs of correspondingly different sizes.

The various objects of the invention will be clear from the description which follows and from the drawings, in which Fig. l is a top plan View of the slug delivery and transfer mechanism showing in dash-dot lines the adjoining part of the press to which the mechanism is applied.

Fig. 2 is a Vertical sectional view of the mechanism taken on the line 2 2 of Fig. l showing in dash-dot lines the uppermost positions assumed by the adjoining parts of the press.

Fig. 3 is a similar fragmentary sectional View taken on the line 3-3 of Fig. l of the delivery end of the runway for the slugs.

Fig. 4 is a longitudinal vertical sectional View thereof.

Fig. 5 is a fragmentary top plan view of the removable and replaceable slug transfer slide.

Fig. 6 is a side elevational view and vertical cross sectional view combined of the support for the cam roller and the outer end portion of the transfer slide.

Fig. 7 is a vertical cross sectional View of the slug delivery pipe and of the overflow cup together with the support therefor.

In the embodiment of the invention shown by Way of example, the extruding press may be of any of the usual types having a reciprocating cross-head lll reciprocated by any suitable mechanism toward and from the relatively iixedvbut quickly removable and replaceable female die II which is provided with a suitable die cavity into which a disc-like slug I2 is delivered when the cross-head is at or near the top of the up stroke thereof shown in dash-dot lines in Fig. 2. The punch I3 carried by the cross-head for quick replacement and reciprocated therewith is of the usual type adapted to enter the die I I thereby to extrude the slug into a tube around the punch on the down stroke, and to carry the tube with it on the up stroke out of the die to ready the die for the reception of the next slug.

Secured to the cross-head I4 and reciprocating therewith is the removable and replaceable slug hopper I4 in which the slugs are agitated to some extent during such reciprocation. The upper end of the removable and replaceable delivery tube I5 is inserted into the hopper and is open to receive the slugs which normally accumulate in a horizontal position in the tube to form a stack as I6 (Fig. 2). Occasionally however, one of the slugs as Il instead of lying flat in the stack, may stand on edge, in which position it cannot be advanced by the transfer mechanism later to be described A slot as I8 is therefore made in the tube for access by the operator to the mispositioned slug, the operator manually turning the slug into its correct position in the stack. Should the mispositioned slug roll out of the upright slot I8, it might reach the press mechanism and interfere with the proper operation thereof. The overflow cup I9 is therefore provided to catch such rolling slugs. Said cup is mounted on the tube I5 below the slot I8 and is secured in place by the nut 20 screwed on a threaded portion of the tube and coacting with the sleeve 2| of the support 22 on which the cup rests to hold the cup and the tube in position. The base of the support 22 is suitably secured as by the bolts 23 to the ixedplate 24 which serves a guide for the transfer slide 25 andl which is adjustably supported by the brackets 26 and 21.

Adjustment of the plate 24 is sometimes required to insure the transfer of the slugs in precisely the proper direction from the bottom of the tube I5 to deposit the slug in the die. For this purpose, the bracket 2B is secured .to the frame 28 of the machine by bolts as 29 passing through oversized holes as 30 in the bracket 26 and thereby permitting limited but sufficient adjustment of the bracket in all directions in the plane of the face 3l of the bracket to accomplish the desired adjustment. Similarly, the bracket 21 is secured to the frame by the bolts 32 passing through slots or oversized holes 33 in the base thereof. Vertical adjustment of the plate 24 is obtained by inserting the pin projection 34 thereof loosely into the upright hole 35 of the bracket 2 and securing the pin in its adjusted position by the set screw 36. It will now be seen that the plate 24 may be pivotally adjusted about the pin 34 in a horizontal plane and also raised or lowered to permit removal of th bottom slug from the stack I6, and to permit the alignment of therunway of which the plate forms a part, with the tube I5 and the die II.

rIhe transfer slide 25 for removing theA slug from the stack and inserting the removd slug into the runway is made preferably in two parts. The inner part 33 is removably secured to the outer part 39 as by means of the screws 4D (Figs. l and 5) and terminates at its inner end in a serrated semi-circular` edge 4I of the same diameter as that of the slug which the slide part 38 is intended to advance. The serrated .edge

serves to breakL any oilV seal which may be formed.

Y .each complete reciprocationof the slide. When* between the edge and the slug, which seal might otherwise adhesively secure the slug to the slide and cause retraction of the slug on the return movement of the slide 25.

Obviously, by the use of slugs and dies of the proper sizes, the press may be adapted to make tubes of various sizes. The female die and punch being removable and quickly replaceable by another set thereof, toV change the press over to make tubes of another size, there remains only the need for the substitution of different slug feeding parts dimensioned to transfer slugs of the other size. Such parts include the slide part 38, the hopper I4 and the delivery tube I5, while the remaining parts of the transfer mechanism may remain in place except as will be explained hereinafter.

The outer slide part 39 is provided with dovetailed side edges 42 (Fig: 6) fitted into the dovetailed guide groove 43 of the plate 24 and slides in said groove a distance in each direction slightly greater than the outer diameter of the tube I5 or a distance approximately equal to said diameter to insure the proper engagement of the slide part 38 with the lowermost slug of the stack and also to insure the advance of said slug enough to completely clear the tube. The mechanism for reciprocating the slide to advance the slug will now be described.l

Secured to the slide part 39 as by the screws 44 passing through the base 46 thereof, is the roller bracket 4l carrying the cam roller 48. To the projecting arms 49 of the bracket are secured the left ends (as viewed in Fig. 1) of the springs 5U, the other ends of which are secured to fixed parts as 5I of the slug runway, whereby the-v roller 48 is pulled against the cam 52 in the mitted by the cam to do so. The cam 52 is secured replaceably to the bracket 53 which is in turn fixed to the cross-head I and recipro-l cates therewith. Consequently, in changing the machine over to operate on tubes of a different,

size, the cam 52 may if desired be replaced by another similar cam giving the required throwY to the slide and a corresponding slide part similar to the part 33 substituted. If desired, the cam 52 may have a throw equal to the maximum movement of the transfer slide in which case replacement of the cam may be avoided. The cam 52 is provided with an inclined Vedge .54 meeting the upright edge 55 of the cam and having a horizontal component equal at least to the desired throw. It will now be seen that downward movement of the cross-head I0 withdraws the bracket 47 and the slide 25 to ycarry the edge 4I of the replaceable slide part 39 to the left of the tube I5 and to a point adjacent said tube. This permits the stack I6 which normally rests on the slide to drop until the lowermost slug of the stack rests on the plate 24 preparatory to the advance of said lowermost slug. On .the upward movement of the cross-head, the springs 55 become effective to move the bracket 41 andv other side of the tube and adjacent to said tube,-

while lthe remainder of the stack rests on the slide. As this operation is repeated, a row of slugs accumulates in the runway, the entire row being advanced as a unit in therunway through a distance equal to the diameter of the slug on die, each reciprocation of the slide forwardsthe right hand end slug slowly into the die to deposit it-accurately thereinto ready for extrusion.

The construction of the runway is such that it may readily be adjusted to guide slugs of clilTerent diameters and to control the movement of the row of slugs so that no overturning of the slugs or overshooting of the die can occur, it being understood that the slug cannot undershoot the die because of the positive movement imparted to the row of slugs by the addition of a slug to one end of the row, thereby causing the entire row to move exactly the diameter of the slug on each reciprocation of the slide and the punch. The plate 24 is preferably extended toward the right past the tube I5 (as viewed in Figs. 1 and 2) and up to or near the die Il to form the bottom of the runway, but as seen in Figs. 3 and 4, the dovetail groove 43 of the plate is omitted and the upper surface of the plate is fiat as shown at 56.

Separate transversely spaced plates as 51, 58 form the sides of the runway and are adjustably secured to the upper surface 56 as by the screws 59 passing through transversely extending slots 6D in said side plates. The distance between the inner edges of said plates is adjusted to the diameter of the slug to be transferred. To prevent the slugs from rising in the runway, a cover 6| is removably secured to one of the plates as 51 and is wide enough to cover the greater part of the row of slugs, but exposes enough of the slugs (see Fig. 1) to permit the operator to inspect them.

Means are provided to control and resist the movement of the end slugs of the row and to brake said movement to prevent overshooting of the die. As best shown in Figs. 3 and 4, said means comprises a sheet spring 62 having one free end portion B4 thereof in pressed contact with the upper faces of the slugs and the other end portion 63 thereof secured in a suitable groove in the under face of the cover, the groove extending the length of the spring to allow the spring to flex to a limited extent. The spring keeps the slugs from vibrating in the runway and while not retarding the movement of the slugs, acts as a brake against such free movement or momentum of the slugs as might cause them to overrun the die. Hence only movement of the row is imparted to the end slugs, which are maintained in their proper flat positions by the spring until the end slug drops into the die cavity.

It will be seen that I have provided a feed mechanism well designed for interchangeability of the parts thereof to accommodate slugs of different diameters particularly in a press wherein the die and punch are readily changeable, that the mechanism is simple in construction, having few parts moving through relatively short distances and at relatively slow speed thereby avoiding excessive wear thereon, and that the movement of the slug may be accurately controlled and the slug fed dependably into its correct position in the die.

While a certain specic embodiment of the invention has been shown and described herein, changes may obviouslyl be made therein without departing from the spirit of the invention dened in the appended claims:

I claim:

1. In an extruding press, a fixed upright slugdelivering pipe adapted to hold a stack of slugs, a horizontally reciprocating slide for advancing one slug at a time from the bottom of the stack to a predetermined point spaced from the stack a distance greater than the stroke of said slide, said stroke being slightly greater than the diameter of the pipe, a horizontal runway between the stack and said point, in which runway the slugs advanced by the slide accumulate in a row and slide as a unit on the addition of a slug to the beginning of the row by the slide, a pin depending from the runway and a bracket pivotally supporting the pin whereby the runway is adjustable about the pin in a horizontal plane, serrated means at the end of the slide for preventing oil-adhesion of the slug to the slide, and a spring brake inthe runway arranged to engage and to resist movement of a plurality of slugs nearest said point to prevent the last slug of the row from overrunning said point.

2. The extruding press of claim 1, the means for preventing oil-adhesion of the slug to the slide comprising a generally concave end on the slide, said end having a plurality of triangular notches therein each meeting the adjacent notches at said concave end to provide spaced apart parallel edges for engaging the slug.

3. The extruding press of claim 1, the spring brake comprising a cover for the major part of the runway extending from one side toward the other side and past the middle of the runway and a sheet spring having one end part secured to the under side of the cover and the other end part free and biased toward the bottom of the runway to engage the upper flat faces of the slugs at the end of the row and thereby pressing the slugs downwardly against the bottom of the runway.

4. The extruding press of claim 1, the pipe having a slot therethrough, and a circular cup concentrically surrounding and carried by the pipe below the slot and of sucient diameter to receive and retain slugs dropping out of the slot and thereby preventing damage to such slugs and preventing such slugs from interfering with the operation of the press, the cup having a central -aperture therein, and the pipe passing through the aperture and being externally threaded above and below the aperture, and clamping means on the pipe above and below the bottom of the cup and cooperating with the threaded part of the pipe to clamp the cup to the pipe.

ANTHONY F. WNUK.

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

UNITED STATES PATENTS Number Name Date 1,352,194 Hooker Sept. 7, 1920 1,652,032 Lynch Dec. 6, 1927 1,792,865 Prussing Feb. 17, 1931 1,981,490 Witte Nov. 20, 1934 2,096,245 Heinze et al Oct. 19, 1937 `2,166,209 Friden July 18, 1939

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