US2273175A - Forging machine - Google Patents

Description

FORGING MACHINE- Fil ed Dec. '20, 1940 4 Sheets-Sheet l INVENTOR Feb; 17, 1942 L, M, BROWN 2,273,175

FORGING MACHINE Filed Dec. 20, 1940 4 Sheets-Sheet 2 Feb. 17, 1942. L. M. BROWN FORGING MACHINE Filed Dec. 20, 1940 4 Sheets-Sheet I5 INVENTOR Feb. 17, 1942. L. M. BROWN FORGING MACHINE Filed Dec. 20, 1940 4 Sheets-Sheet 4 INVENTOR i 4 g 7%. fimm Patented Feb. 17, 1942 UNITED STATES FAT T OFFICE FonciNG MACHINE Linwood M. Brown, Pittsburgh, Pa., assigncr to L. M. Brown, Inc., a corporation of Delaware 6 Claims.

This invention relates to forging machinery,

and consists in means for transferring blanks one omy in operation. The invention has been developed in application to a machine for forging bits for coal-mining machines, and in such application it will here be shown and described.

In the accompanying drawings Fig. I is a view in which one of the dies of a forging machinethe anvil die-is fragmentarily shown in vertical section, and, associated with it, the blank-transferring and the blank-supporting means are shown in side elevation. In Fig, I the movable parts are shown in position for the initial receptioncf a blank to be forged. Figs. II and III are similar views of the same assembly, but showing the blank-transferring and blank-supporting means in successive positions in the course of operation. Fig. IV is a fragmentary view in vertical and longitudinal section of a portion of the blank-transferring means when in the position shown in Fig. I. In this figure the blank carrier is particularly shown. Fig. V is a view in vertical and transverse section, on the plane indicated by the arrows V-V, Fig. III. Fig. VI is a view in plan of the blank carrier that in Figs. IV and V is shown in section. Figs. VII and VIII are views of the carrier in end elevation and in vertical and transverse section, as indicated by the arrows VII-VII and VIII-VIII, Fig. VI, respectively. And in Figs. VII and VIII a blank support is diagrammaitcally indicated in successive positions of co-operation.

The Work-carrying and work-sustaining parts, in which invention is found, are parts of an organized machine that includes a chute I through which heated blanks are fed one by one-in this case by gravityand a die 2, upon the faces of which the blank is forged and its tip is brought to ultimate shape, completing the bit. In Fig, I a blank B is shown in dotted lines, in position in a carrier 3, and it will be understood that the blank, descending through chute I, has been re-- ceived by the underlying carrier 3 and arrested within the carrier, in the position shown. In Fig. III a finished bit C is shown, its forged tip resting upon the surfaces of the die 2.

The invention includes the carrier 3, which slides in horizontal course upon the face of a plate 4, and between guide rails 5 and 6. Upon the face of rail 5 is secured the overhanging plate 7. The carrier 3 moves in slideway so defined between two extreme positions: one, the blank-receiving position beneath chute I, shown in Fig. I; the other, the blank-delivering position beneath die 2, shown in Fig. III. At the blank-receiving end of its range (the right-hand end, Figs. I and IV) a stop-block 50, rigidly mounted upon plate l, arrests the carrier in its left-to-right traverse. A block of wood has been found suitably to afford a stop of the desired degree of elasticity.

The carrier 3 (of. Figs. I, I I-VIII) is of boxlike form, open above, and consists of two castings 8 and i) and two plates it and I l. The casting 8 forms the outer side wall of the carrier and also the end wall, at the end (Fig. I) remote from the die 2; the castings forms the inner side wall, and the two castings are bolted together. The face of casting 8 is stepped to be securely engaged by rail 5 with its overhanging plate 7 (cf. Fig. V), and casting .l is shaped to rest firmly upon rail 6 (as also seen in Fig. V). The casting 3 carries a stud l2, provided primarily for engagement by the carrier-shifting means, and upon this stud the two plates It and "H are strung (suitable holes being formed in the plates). Plate if! is bent and shaped, as best seen in Figs. VII and VIII, to lie flat against the outer face of casting 8, to underly and to form the floor of the carrier, and to extend in an obliquely directed end it, for purposes presently to be described. Plate H is bent and shaped, as best seen in Figs. VI and VIII, to lie fiat against the outer face of casting 8 (plate If), however, lying interposed between) and to form the end wall of the carrier, at the end (Fig. I) adjacent to die 2. The stud l2 carries a properly backed spring Hi. The spring bears compressively upon the outer face of plate H, and is effective normally to hold plates If) and I! snug upon the outer face of casting 3, and when the plates are so held, plate it! affords a closed bottom for carrier 3 and plate H a closed end wall. From such positions the plates may be shifted, against the tension of spring 14.

Within the carrier a block it is pivotally mounted. A stop it limits its turning in clockwise direction (Fig. IV) and a light spring I! tends to turn it in clockwise direction. This block is so shaped and arranged, and its driving spring is of such limited strength that when a blank B descending by gravity from chute l strikes the block the block yields slightly, in counter-clockwise turning, and at the same time guides the blank to secure position, resting upon the bottom wall it! and against the end Wall of the carrier, and in such position (the position indicated in Fig. IV) the blank is by the springbacked block secured.

A lever E8 of the third class, bifurcated at its outer end, is fulcrumed on a shaft I!) that is mounted in rigid bearings. This lever, by its bifurcated end, engages a roller 2!) idly mounted upon the stud l2, and by such engagement the lever in its swinging effects the shifting of the carrier 3 between its blank-receiving and blankdelivering positions. A shaft 22, mounted in rigid bearings, carries arms 2| and 23 and provides a manually operable lever of the first class. Its work arm 23 is equipped with a roller 24. The lever [18 carries integrally an arm 25 upon the face of which, as shown in Figs. I and II, the roller 24 makes engagement. As the lever 2|, 23 is swung clockwise, from the position shown in Fig. I to that shown in Fig. II, the lever i8 is driven, by the bearing of roller 24 upon the face of arm 25, in counter-clockwise turning, and the carrier 3 is shifted from the blank-receiving position (Fig. I) toward the blank-delivering position (Fig. III). The arm 25 is formed as a separate member, mounted on a pin I86 carried by lever i8, and a bolt-and-slot engagement 26 is provided, by which the arm when swung to proper angularity with relation to the lever It may be integrated with the lever, and by such means the range of the right-to-left traverse of the carrier 3 may be accurately adjusted.

The lever H2 is provided with an integral arm 21, and a tension spring 28, anchored to the arm 21, is at its opposite end anchored to the rollerequipped lever arm 23. The lever l8, in that it is provided with the arm 27, becomes, under the tension of spring 23, a lever of the first class. The tension of the spring 28 is effective to shift the carrier to abutment upon block E! and to blank-receiving position (Fig. I) when lever I8 is free to turn under that influence.

A work-support in the form of a lever 30 is fulcrumed in a block 3| that moves in a runway formed by and between two rigidly mounted bars 32 and 33. A spring-backed pivoted bar 34, en-

gaging the lever 33, tends always to cause the lever to turn counter-clockwise (Figs. IIII) on its fulcrum; and in the range of operation such turning is opposed, first by the bearing of the lower arm of the lever upon the face of a stationary guide-block 35, and afterward by the bearing of the upper arm of the lever upon the face of a guide-block 36 (cf. Figs. III and V). The lever 33 that forms the work-support, the bars 32 and 3t, and the guide- blocks 35 and 36 are so shaped and proportioned that, as the fulcrum block 3| is shifted upward from the position shown in Figs. I and II to that shown in Fig. III, the work-support rises from inactive to active position. In its rise the work-support 30 engages the obliquely disposed end |3 of plate It] (Fig. VII) and shifts plates Ill and H aside (against the tension of spring Hi). Continuing to rise, the work-support til engages the blank B within the carrier (Fig. VIII) and brings it to position adjacent the die 2 (Fig. III).

Such rise of the work-carrier 3i) is effected by an arm 3? extending from shaft 22 and engaging the fulcrum block 3| by its bifurcated end, as seen in Figs. II and III. There is splined connection between the shaft 22 and the hub 29 of the arm 31, but the spline-receiving recess in one of the members (conveniently in the hub, as the drawings indicate) affords free turning of the shaft within the hub through a limited range (approximately as here shown). The parts are so arranged that, in the swinging of lever 2 23 to effect transverse of the carrier 3 from blankreceiving position (Fig. I) toward blank-delivering position (Fig. II) the shaft turns freely within the hub 29 of the still unmoved arm 31. In this initial swing the lost motion is taken up; and as the carrier approaches the left-hand limit of its range the continuing shift of the lever causes arm 31 to swing. The lever 2|23 continues to swing, until it brings arm 31 to the position shown in Fig. III. In this swing of arm 31 the work-support 36 is raised from inactive to active position.

The parts are so proportioned that as lever 2| is swung the rising work-support engages the oblique end l3 of plate It before the roller 24 passes beyond the upper end of plate 25. The plate 25 is so adjusted with relation to lever l8 that, at that point in the operation, the carrier 3 has come precisely to work-delivering position. When in the continued swing of lever 2| roller 24 passes beyond the upper end of plate 25 the spring 28 is effective to swing lever |8 clockwise, and to bring carrier 3 again to its initial blankreceiving position (Fig. III). Such return of the carrier is unimpeded, because the end wall of the carrier, formed by the plane I, has been shifted, and the carrier is, at the time, open-ended. When, however, the carrier on its return movement is free of engagement with the work-support Bil, the spring I4 is effective to bring again to closing positions the bottom wall and the end wall of the carrier.

When the forging operation is completed, the lever is shifted again, counter-clockwise from the position shown in Fig. III to that shown in Fig.1, and the return movements of the operative parts are effected, in reverse order. As the work-support descends, the finished bit slips from its position upon die 2, and topples from the support to a receptacle provided to receive it.

Provision is made for allowing the roller 24, in the return movement of lever 2|, to pass to one side of plate 25. Such provision is found in a hinging of the arm 23 at an intermediate point in its extent, as indicated at 3B, and in forming upon plate 25 an extension 39 with a surface so disposed that the distal end of lever 23, abutting upon this surface is swung aside. When the arm 23 in its counter-clockwise swing has so passed the plate 25, the spring 28, because of its oblique position (cf. Fig. V) is effective to swing the distal end of the arm back again, with the roller 24 again opposed to the face of plate 25.

C'o-operating with the parts described, and particularly with the work-support 30, means are provided for sustaining the blank yieldingly in position, spaced slightly from the face of the anvil die 2, to meet the repetitive blows of the hammer die (not shown). These means are found in a lever with a resilient arm 40 that is swung against spring tension from the full-line to the dottedline position, Fig. V, by the downward shift of a wedge plate 4| upon which the lever at its lower end rests. The plate 4! is shifted in response to the turning of a shaft 42, and the shaft is turned in one direction by a treadle 43, and in opposite direction by a spring 44. The work-engaging position of lever 49 is nicely determined by means of the adjusting screw 45 through which the lever engages the wedge plate.

In operation, the attendant swings the lever 2| clockwise. Such clockwise swing of lever 2| first causes carrier 3 (which, as may be understood, contains a bit blank, as seen in Fig. I) to advance from right to left; then, as the carrier approaches the limit of its range of advance, the continued swinging of lever 2| causes work-support 30 to rise. As the carrier comes to the limit of its advance the rising work-support forces aside the bottom plate and the end wall of the carrier, and receives upon its properly shaped upper end the bit blank. When this has occurred the carrier returns under spring tension to its initial position. Meanwhile the work carrier continuing to rise brings the work to place adjacent the surface of die 2. The attendant at the same time presses treadle 43 and causes lever 40 to swing to engagement with the rising blank and yieldingly to sustain it accurately in place. Forging follows.

When the forging operation is completed the attendant, having released the treadle, and so allowed spring 44 to shift the wedge block 4| upward and the spring-backed lever 40 to resume inactive position, swings the lever 2| again in reverse course to initial position. In this return swing the lost motion between hub 24 and shaft 22 is first taken up, and then the work support 30 is returned to initial position, and the arm 23, by virtue of the ability of its hinged distal end to be swung aside against spring tension returned to its initial position with the roller 24 in proper position for engagement with plate 25, on renewal of operation.

I claim as my invention:

1. In a forging machine the combination with a die, of a guideway, a blank-carrier reciprocable along said guideway between receiving and delivering positions, means for positively driving said carrier along said guideway through a predetermined course, a spring tending to shift the so driven carrier in reverse direction, means for releasing the carrier from said positive driving means at the end of such course to the action of said spring, and a movable work support adapted to engage a blank within the carrier when the carrier in response to said positive driving means has come to the end of its course, and to bring the blank to position with relation to the die.

2. The structure of claim in which said positive driving means include two relatively movable members, said spring being connected between said members, whereby the positive driving means in their carrier-driving operation augment the tension of the said spring.

3. In a forging machine the combination with a die, of a guideway, a blank-carrier reciprocable along saidguideway, and means for reciprocating said carrier along said guideway from a remote position to an advanced position beneath said die, the carrier being provided with a bottom wall movable from blank-retaining position to blank-releasing position, a work-support reciprocable vertically beneath said die and in its rise having a portion adapted to engage and move the bottom wall of the said carrier to blankreleasing position when the carrier is in its advanced position, to receive a blank within the carrier, and to bring the blank to forging position with relation to the die.

4. In a forging machine the combination with a die, of a guide-way, a blank-carrier reciprocable along said guideway, and means for reciprocating said carrier along said guideway from remote position to an advanced position beneath said die, the carrier being provided with a bottom wall and an end wall both movable from blank-retaining positions to blank-releasing positions, a work-support reciprocable vertically beneath said die and having a portion adapted,

when the carrier is in its advanced position and the work-support rises, to engage and shift to blank-releasing positions both the bottom wall and the movable end wall of the carrier and to raise a blank from within the carrier to forging position with relation to the die.

5. In a forging machine the combination with a die of a guideway, a blank-carrier reciprocable along said guideway between receiving and delivering positions, said carrier being provided with a bottom wall and an end wall both movable from blank-retaining positions to blankreleasing positions, means for positively driving said carrier along the guideway from a remote position to an advanced position beneath said die, a spring tending to shift the so driven carrier in reverse direction, means for releasing said carrier from said positive driving means when the carrier has come to advanced position, and a work-support reciprocable vertically beneath said die and having a portion adapted, when the carrier is in its advanced position and the worksupport rises, to engage and shift to blank-releasing positions both the bottom wall and the movable end wall of the carrier, and to raise a, blank from within the carrier to forging position with relation to the die.

6. A forging machine including a forging die, a carrier movable from blank-receiving position to blank-delivering position, said carrier including a blank-supporting portion yieldingly secured to the carrier body, said portion being movable from blank-supporting position to blank-releasing position, means for shifting said carrier from blank-releasing position to blank-delivering position, a member movable relatively to said carrier in blank-delivering position, said member including a portion that in its movement engages the blank-supporting portion of said carrier, to shift it from blank-supporting position to blank-releasing position, said member being adapted to shift the released blank from the carrier to forging position on said die.

LINWOOD M. BROWN.

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