US1512931A - Sheet-metal-bending die - Google Patents

Description

' J. HUBER SHEET METAL SENDING DIE Filed Sent. 26, 1922 2 Sheets-Sheet 2 FEE- 7 O 47 Patented Get. 28, 1%24.

JOHN HUBER, 0F 'BELLWo'on, PENNSYLVANIA.

sHEET-MrirAL-Biinnins DIE.

Application filed September 26, 1922. Serial No. 590,617.

To all whom 272, may concern:

Be it known that 1, JOHN HUBER, a citizen of the United States, residing at Bellwood, in the county of Blair and State of Pennsylvania, have invented certain new and useful Improvements in Sheet-Metal- Bending Dies, of whichthe following is a specification.

My invention relates to the art of bending sheet or plate metal between suitably formed dies, It has in view to utilize the main frame of a power actuated shear, punch, press or other similar machine, by providing suitable dies and supporting and adjusting mechanism, capable of attachment tosuch a machine, and adapted to operate in the manner hereinafter described.

The invention particularly refers to means for mounting and supporting the plate to be flanged, to an improved form of die mechanism, means for maintaining atemp orary holding pressure on the plateduring bending, and to various other features of the mechanism, as hereinafter more fully described. The present invention is a further development of that shown in my prior Letters Patent No. 1,482,927, dated February 5, 1924.

In the drawings:

Figure 1 is a partial View in side elevation of a standard punch, shear, or press, equipped with the necessary mechanism for flanging a circular boiler plate or head;

Fig. 2 is a cross sectional detail view on the line IIII- of Fig. 1;

Fig. 3 is a detached partial view similar to Fig. 1, showing the pressing die in raised position atthe commencement of the bending operation;

Fig. 4 is a diagrammatic detail View of the valve controlling mechanism for the fluid-actuated pressing cylinders;

Fig. 5 is a detail View showing one of the valve arms in its alternating position;

Fig. 6 is a detail plan view of the operative mechanism of Fig. 4;

Fig.7 is a sectional detail view, enlarged, of the pressing mechanism for holding the plate during the bending operation;

Fig. 8 is a sectional plan View thereof on the line VIIIVIII of Fig. 7; and

Fig. 9 is a transverse sectional view on the line IX -IX of Fig. 8. e

In the drawings,2 is the main frame or housing of a standard punch, shear, or press, having the usual anvil block or base 3 and head 4. the head 4is usually mounte-da cam or eccentric-actuated reciprocable head or base, to which is attached the punch or shear of common use. The actuating shaft 0 for such cantor eccentric is usually provided: with adriven gear 6 engaged by pinion cof power shaft (5, of well known construction, as in; Fig. 4.

The usual punch orshear, inthe present case, is replaced by, abloek 5, adaptedto be raised and. lowered by the actuating mechanism in connection with the customary clutch, forintermittent operation. Blockb is provided with a centrally arranged tem-,

per screw 6, which is connected by its swivel "FFICE.

head 7 and retaining plate 8, or in any other suitable manner,with the reciprocable die block 9. s V

The die block 9, in the present construction, is adapted for vertical movement and operation upon the practically horizontal blank, by vertical movement thereagainst. For such purpose, and to facilitate the easy bending and action of the die, its lower face 10 is slightly sloped backwardly from the front corner, and its front face 11is sloped I I slightly forwardly of its front general vertical direction, said faces being joined by a rounded knuckle or corner .12. p

The object of such formation is that the die block 9, in its downward movement against the projecting edge of. the plate 6,

as in Fig. 3, will engage the outer edge of the plate by its slightly sloping face 10, bending it downwardly over the right angle corner of the L-shaped anvil block 14, which 7 is mountedqupon the forwardly and upwardly extending bracket support 13 of the machine. This latter feature is generally similar to the bracket construction shown in my prior application above referred to, and is adapted to be fitted upon and screwed to the shouldered base 3 of-the machine, as will be readily understood.

In operation, the plate 6 having been located with its edge extending over anvil block 14 in range of the bending die, and with the clampingmec'hanism applied'thereto, as hereinafter described, downward movement of die 9 easily and gradually bends the projecting portion of the plate down around and upon anvil 14, and against theinner face thereof, as in Fig. 1,at right angles to its upper face, resulting in a right angle flange. Theoperation is easy, gradual, and co'mplete,'due tothe angular are rangement of the parts, and avoiding the necessity of subsequent or doubleflanging.

The circular plate e to be flanged is pivotally mounted at its center by a hole upon a centering pin or stud 17 extending up wardly from and supported by a block 18 which is slidably mounted upon a pair of supporting channel or other bars 19-19 incorporated with and extending outwardly from the base 13, and resting at their outer ends upon a foundation support 20, as in Fig. 1.

The centering block 18 is slidably and ad justably mounted on channel members 19 and fixedly secured in its desired position when adjusted by set screws 21. Centering pin 17 is a portion of a larger stem or bolt '22 in threaded engagement with the hub or hearing 18, through which it'extends, and is provided with the terminal nut 23 for adjustment therein. It extends upwardly through such bearing and is provided with an adjusting nut '25, whereby to fixedly lo- 'cate and hold the stem 22 exactly at the right height for pivotal mounting of plate 6 on shouldered stud 17. A terminal nut 26 is used, if desired, to retain the plate loosely in rotative position.

For the purpose of preliminarily clamping the plate downwardly upon anvil 14, I use a series of pressing shoes 27 27 and .28. These are mounted by guiding studs 29 in the lower portion 30 of a downwardly ex- .tending adjustable frame 31, as clearly shown in Figs. 7 and 9. The shoes are of sufficient width to engage an ample area of the plate to hold it firmly, and the shoes themselves are pressed downwardly by a plurality of wedges 32. Wedges 32 are formed as portions of reciprocable bars 33, a pair of such bars being preferably utilized, each havinga piston stem 34 connected with a plunger 35 of a fluid-actuated cylinder 36. Said cylinders are mounted at opposite ends upon the projecting portions 30 of the bottom plate 30, and bars 33 are mounted for longitudinal movement across and underneath an upper plate 37 of frame 31. By such construction, the simultaneous actuation of bars 33 move the several wedges 32, depressing the several studs 29, and pressing all of the shoes 27, 27, 28 downwardly upon the portion of plate 6 which extends over the anvil block 14, and holding it firmly thereupon.

For the purpose of guiding shoes 2728 and maintaining them in operative position at all times, each shoe is provided with upwardly extending guiding'pins 38 project ing through suitable bearings inplate' 30, having terminal washers 31 and nuts. A spiral spring 33 normally presses upwardly against the washer 31 to retract the pressing shoe, which spring is preferably surrounded with a protecting shell 34, provid ing for ample range of movement. Its upper edge limits undue downward movement of the pin 38 and shoe by abutting engagement of washer 31 Such construction being provided at each side of wedge-actuated studs 29 ensures equalization of the pressure and prompt retraction of the several shoes when the wedges are withdrawn.

F or the purpose of automatically operating the pressing mechanism, I provide a controlling valve 24 to control pressure to one end of each of cylinders 36, simultaneously, by means of a fluid pressure supply pipe 40, having branches 4141 connected with each cylinder, as shown. Valve 24 is provided with a normal pressure supply line 42 and a suitable exhaust, so that, as the valve is direction it will open the exhaust passages to 7 permit return movement of the plungers 35 under action of a reverse pressure, with suitable exhaust of'the inert fluid.

In a similar manner, a controlling valve 24 controls pressure through supply pipe 40 and branch :pipes 41, to the'opposite ends of cylinders 36, to reverse the movement of plungers 35 to release the wedges 32, after each sectional bending of the flange.

For the purpose of thus actuating each valve 24 and 24*, their stems 43 are each provided with a double ended lever 44, extending at one side into the range of a pin or abutment 45, suitably located on gear I), as on one of the arms thereof, and extending at the other side in the rangeof a similar pin or abutment 46, also properly located and timed, as will be observed from Figs. 4 and 5.

In operation, pin 45, in the normal movement of the gear, will engage the outer arm of lever 44, wiping past it, and opening pressure to cylinders 36, and after such pressure has been exerted a suflicient length of time, as during the bending of the flange, abutment 46 will then come into contact with the opposite arm of the lever, depressing it and opening the valve to exhaust, permitting retraction of the wedges 32.

In the same manner, abutment 46 likewise operates the other arm 44 to actuate valve 24 to reverse plungers 35 to release wedges 32 at the end of the pressing period, it being understood that the location of the abutments 4546 on the gear 6, the positioning of the arms 44, and the timing of the-valves is properly proportioned to effect the movements as desired in proper-sequence, as will be readily understood.

In order to provide clearance for removal of the flanged plate, the pressure bracket 31 is adjustably mounted on a suitable sup porting frame 47 secured to the front of head 4, as shown. Bracket 31 is pivoted by b'olts 4-8Zat'each side so as to swing upwardly and outwardly, with its" clamping mechanism, to allow of-removal' of the flanged raised position by engagement in either of the holes 50, as will b'e readily understood. The; terminalconnecti'ons 41 for the pressure pipes are made flexible, asby sections of rubhose, allowing for the necessary movement of the cylinders with thebracket.

arranged, the mechanism iscapablev Ofbonti-nuOusand semi-automatic operation', in so far as-the clamping and bending steps. are involved, itbeing only necessary to move the plate "eupon itspivotal mounting sufficiently farfor the-nextbending operation. lt-wi-ll be'un'clerstood that, in mechanism of this kind, there are preferablycarried out a plurality of complete annular manipulations and bending operations, so that variations in the desired circular contour of the flanged plate are compensated for and smoothed out by continuing the series of annularly progressive bending movements during two, three, or more complete annular series.

The construction and operation of the invention will be readily understood and appreciated from the foregoing description. The several parts are comparatively few and simple, of cheap construction, and may, of course, be made of the proper size, degree of angle, or otherwise modified by the skilled mechanic, to adapt the machine to the work in view. All such changes are to be understood as within the scope of the following claims.

What I claim is:

1. In combination with a supporting base and a reciprocable power driven head, a bracket mounted on the base provided with an L-shaped anvil block having an inwardly and downwardly sloping rear face and a forwardly extending supporting face, and a co-acting pressing die secured to the reciprocable head and provided with a correspondingly inclined face adapted to bend a flange against the rear face of the anvil block.

2. In combination with a supporting base and a .reciprocable power driven head, a bracket mounted on the base provided with an L-shaped anvil block having an inwardly and downwardly sloping face, a co-acting pressing die secured to the reciprocable head and provided with a correspondingly inclined face, and a lower inclined face merging thereinto by a rounded corner and at an obtuse angle to the first named face, and adapted to make first bending contact against the edge portion of a blank laid across the L-shaped block.

3. The combination with a supporting base and reciprocable power driven head; a bracket m'ountedon the base provided: with'u an L-shaped anvil block having a down. wardly and". inwardly sloping rear anvil".

face, an upper outwardly and downwardly sloping supporting face at right angles thereto, and a co-acting pressing die having; a b'endin-g'face inclined 1n parallelism with.

the rear face of said anvilb'lock, adapted to bend a sheet'or plate metal blank flatwise over the corner of the lr-shaped anvil block and against its rear face.

4. In a machine of the kind"disclosed, a lower bracket'provid'ed with an anvil block:

vided with an-adjustable threaded bracket,

a-th'readed stud-extending therethrough providedwith tightening devices, and a terminal reduced extension thereof providing a pivotal bearing for a blank.

5. In a machine of the kind disclosed,'a lower bracket provided with an anvil block having a downwardly and outwardly sloping upper face, a downwardly and inwardly sloping rear face at right angles thereto, a co -acting pressing die and means for actuating it, a forwardly extending frame provided with an adjustable threaded bracket, a threaded stud extending therethrough provided with a tightening device, and a terminal reduced extension thereof providing a pivotal bearing for a blank, said bearing and its parts being adjustable toward and from the anvil member on a plane parallel with its upper face.

6. In combination with a pressing machine of the kind disclosed provided with an anvil member, clamping mechanism comprising a plurality of wedge actuated shoes, a supporting frame therefor, co-acting wedges, fluid actuated mechanism therefor, and means for controlling said mechanism in conformity with the operation of the machine.

7. Clamping mechanism for a blank in a pressing machine of the kind disclosed comprising a supporting frame, a plurality of pressing shoes having actuating stems, wedges therefor provided with reciprocable bars, fluid actuated plungers connected therewith, cylinders therefor, controlling valves for said cylinders, and means actuated by a portion of the pressing machine for actuating said valves to apply or release pressure.

8. Pressing mechanism for a blank in a machine of the kind disclosed comprising a supporting frame, a plurality of pressing shoes each provided with a pressure stem and spring-controlled retracting stems,

wedge mechanism for the pressing stems, I

fluid-pressure mechanism for actuating said Wedges, and means dependent on the operation of the machine for controlling the fluid pressure supply of said mechanism.

9;Pressing mechanismfor a blank in a machine of the kind disclosed comprising a supporting frame, a plurality of pressing shoes each provided with a pressure stem and springcontrolled retracting stems, Wedge mechanism for the pressing stems, fluid pressure mechanism for actuating said Wedges, controlling valves and pressure applying connections between the valves and said mechanism, abutments located on a moving part of the machine, and actuating means for the valves arranged in thepath of said abutments.

10. In combination With the gearing of a pressing machine having a reciprocable head, pressure actuating mechanism provided With operating cylinders, pressure controlling valves therefor having tilting arms,

and a plurality of abutments on the gearing adapted to engage said arms, said parts being mounted on and carried by: the

reciprocable head. i

11. In a pressing machine havinga reciprocable head, a bracket pivoted on the head provided With pressure applying mechanism adapted to act on a'blank, and means for locating the bracket in lowered operative po- 7 sition or raised inoperative positiom 12. In a pressing machine having are-1 ciprocable head, a bracket pivoted on the head provided With pressure applying mechanism adapted to act on a blank, and remov able'locking devices for holding the bracket on the reciprocable head in a lowered .opert ative position'and in a raised inoperative 7 JOHN HUBE f

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