US2867823A - Heading machine having an additional punch stroke effective at the forward position of the header slide - Google Patents

Description

Jan. 13, 1959 c. LOUIS ETAL 2,867,323

READING MACHINE HAVING AN ADDITIONAL PUNCH STROKE EFFECTIVE AT THE FORWARD POSITION OF THE HEADER SLIDE 3 Sheets-Sheet 1' Filed Sept. 12, 1955 Fig. 1

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HEADING MACHINE HAVING AN ADDITIONAL PUNCH STROKE EFFECTIVE AT THE FORWARD POSITION OF THE HEADER SLIDE Filed Sept. 12, 1955 .3 Sheets+$heet 2 Jan. 13', 1959 v c, Lows r 2,867,823

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READING MACHINE HAVING AN ADDITIONAL PUNCH STROKE EFFECTIVE AT THE FORWARD POSITION OF THE HEADER SLIDE I Filed Sept. 12, 1955 5 Sheets-Sheet 5 (jun Kw! fit, M-Km/ K004 Uni tes Pate HEADING MACHINE HAVING AN ADDITIONAL PUNCH STROKE EFFECTIVE AT THE FORWARD POSITION OF THE HEADER SLIDE Claus Louis, Solingen, Karl Sieber, Hamburg, and Friedrich-Karl Koch, Krefeld, Germany Application September 12, 1955, Serial No. 533,594

Claims priority, application Germany September 13, 1954 4 Claims. (Cl. -12) This invention concerns an automatic multi-stage press for the manufacture of articles, such as threaded bolts or the like, from rod sections, said press having a plurality of dies and punches and also controlled ejectors.

Automatic presses of this kind usually include an automatic feed mechanism for the rod, from which during each working stroke a blank is cut off, and also an automatic cutting device serving this purpose. Furthermore, in such presses there is usually provided an automatic gripper device, which during each working stroke brings the cut-off blank up to the die of the first pressing stage, the pressed article ejected from this die to the die of the second stage, and if necessary, the pressed article ejected by the second die to the die of the third stage, and so forth. The number of dies and punches co-operating therewith and arranged on a reciprocating carriage is determined by the number of pressing stages required.

It is known in such presses to form the press frame as a closed casing, to accommodate the press drive therein and to arrange in front of anouter wall of the frame casing, a block rigidly connected to said wall, which block contains the dies and ejectors, and also the punch carriages. The afore-rnentioned auxiliary devices, namely the cutting and the gripper device must, of course, be disposedbetween the die block and thepunch carriage. In known presses, these auxiliary devices considerably hamper the accessibility and the possibility of observing the press tools, and every, time a press tool has to be changed, they have to be dismantled or swung out. Moreover, the rod fro-m which the press cuts off a blank during each working stroke, is advanced in the direction of movement of the punch carriage. The controlled cutting devicefor cutting oif the blank must consequently operate transversely to this direction of movement, whereby a considerably complicated power transmission from the press drive to the cuttingdevice results. The feed device of the rod, which must be secured either to the die block or to the stationary guide for the punch carriage, islocated externally of these parts and thus increases the overall length of the press.

It is an object of the invention so to arrange the afore- ICC of movement when the carriage advances, remains as slight as possible.

A still further object of the invention lies in adapting the press in such a manner that it is rendered possible to manufacture articles of extremely varied shape therewith, by 'a simple exchanging of the press tools. The afore-mentioned known presses are generally single purpose presses and only permit the manufacture of articles of a definite shape and dimensions, e. g. of threaded nuts and/or threaded bolts only.

Further objects and advantages of the invention, and the manner in which they are realised, will hereinafter be more fully described, by way of example with reference to the accompanying generally simplified drawings, which show one preferred embodiment of the invention, and in which: I

Fig. 1 is a side elevation of the press constructed in accordance with the invention,

Fig. 2 is a plan view thereof, partly in section,

Fig.- 3 is a vertical cross-section through the working parts of the press, taken on the line III-III of-Fig. 2,

Fig. 4 is a front perspective view of the press.

The frame, generally denoted 1, of a fully automatic multi-stage press for manufacturing shaped objects from rod sections, is constructed in the form of a closed casing, Rigidly fixed to the outside of the front wall 2 of .the framecasing 1, which encloses a hollow internal space 1a, there is a guide 4 and a block 5 which preferably form an integ'ralunit with the casing 1. Reciprocating in the guide 4 there is a punch carriage 6 which at the end facing the block carries several superposed punches 7. Mounted in the block 5 on the same levels as the associated punches 7 there are several fixed dies 8; The punches 7 and the dies 8 are interchangeably arranged on their holders in the usual manner.

The punch carriage 6 is supported on a lower fixed slide bearing 19, in the manner of a cross-head, by means of extensivefsupporting surfaces 9 projecting beyond the carriage body. The bearing 10 encloses aplurality of chambers 1611 through which flows a cooling liquid. As shown in Fig. 3, the bed 1% of the slide bearing 10 which is formed integrally with the frame 1, extends over mentioned auxiliary devices that the press tools remain ternally of the frame 1.

readily accessible and may be conveniently kept under observation and exchanged.

A further object of the" invention consists in adapting and arranging the feed mechanism of the rod from which the blanks are cut off, in such a manner that any in- .crease of the given overall length of the press is unnecessary. By the given overall length there is to be understood the length resulting from the dimensions of the die block and the. punch carriage, together with the carriage drive and the size of the working space of the the internal space to of the frame 1 end runs in a bearing 16 formed in the rear wall 3 of the the whole length of the press, and underneath and beyond the die block 5. t

The punch carriage 6 is externally covered by an end plate 12 rigidly arranged on the frame 1 and containing a bearing 13 for the end of the shaft 14 of a crank drive 15 by whichsaid carriage is displaced. The drive shaft 14 of this crank drive, which is also enclosed relative to the outside by the end plate 12, passes through and at its other framev On the shaft 14 is mounted a gear wheel 17, which may be rotated by the main drive of the press. For the sake of clarity the main drive has been omitted from the drawing and may be arranged inside or ex- In the interior space 10 of'the box frame 1 there is also provided a mechanism 18 comprising a pair of driven serves to cut a blank 19a off-the rod 19 at each workingstroke of the carriage 6. Each blank 19a cut off fromthe rod 19, the length of which depends upon the adjustable feeding speed of this rod, may be swung by meansv of a gripper device 22 (Fig. 2) through an angle of so that its longitudinal axis becomes aligned in the di', rection of movement of the punch carriage 6. .The blank 19a when in this position, is seized by'a second gripper A cutter device 21 of l ployed.

exterior cap 46 (Fig. 4) which is 3 device b, which for reasons Fig. 4.

While the uppermost tongs or the like of the gripper device b grip the blank 19a, tongs located below simultaneously seize thepresSed articlee'jected from the uppermost die 8. Further tongs at the same time seize the other pressed articles ejected from the other dies in the direction of the punch carriage. All the tongs then move downwards through a distance of one die, so that all pressed articles in the gripper device b come to rest in front of the next lower, and the blank 19a in front of the of clarity is shown only in uppermost, die 8. The gripper device [2 thus operates in 1 the perpendicular direction during the stationary of the press tools 7 and 8 which are oppositely disposed in pairs,

1 so that during each working stroke of the punch carriage 6, apressed articleis located in each die 8.'

-Ejectors, and grippers of known construction are em- The main drive of the press acts directly on the punch carriage 6 by way of the gearwheel 17, the shaft 14 and the crank drive, and also acts by way of the same gearwheel 17 and the cam drive 17a, 32 directly on the control slide 31. The drive to the remaining mechanisms of r the multistage press, namely the feed device 18, the gripper device 22, the further gripper device I) and the ram 28 may, in the usual way, be taken off from the main drive in such a manner that said mechanisms are given a movement corresponding to the operational cycle of the i press.

It may possibly be desired, depending upon the nature lof the individual operations, to impart an additional stroke to a punch different from the punch 7a, when the punch carriage 6 is in its forward dead centre position.

For this purpose it is clearly possible to use an arrangement similar to the members 27 to 29 as for the punch 7a.

An alternativemethod of construction of such an arrangement is shown in Figs. 1 and 2. A lever 40 acting on a punch'7 and a thrust member 41 positively engaging the free end of this lever are pivotally mounted on the punch carriage. One arm 41a of the thrust member 41 ;reciproc ating with the carriage 6 rests on a cam disc 42, whose shaft 43 is driven by the shaft 14 by way of a reduction gearing 44. The drive 43, 44 is covered by an detachably mounted on the cheek l2.

When the cam disc 42, whose shaft 43 is mounted in :the check 12 of the U-shaped guide 4, lifts the arm 41a the lever 40 is slid to the left by the thrust member 41.

This lever thus urges the associated punch 7 also to the left, in the direction towards the associated die 8, so that the punch in question executes an additional stroke relative to the carriage 6. Depending upon the arrangement and construction of the cam disc 42 it is possible for the additional stroke to beimparted to the associated punch shortly before, during or shortly after the ending of a working stroke of the punch carriage 6. l It is also possible by means of this arrangement to con trol an ejector arranged co-axially relative to a hollow punch on the carriage 6. The drive for this ejector or a punch which has to execute an additional stroke, may also be transmitted directly from the connecting rod of the carriage 6. In this case, the connecting rod and the connecting pin are rigidly connected with one another, thus imparting a reversible rotary movement to the connecting pin by the connecting rod.

A toothed segment mounted on the connecting pin engages in a second toothed segment arranged on a shaft parallel to the connecting pin. By this means, an arm mounted on a shaft, which is connected with the ejector or the punch in question, is caused to execute a reciprocating swinging movement. This swinging movement of the dri n a m i a m te am -e c o o the P n as a reciprocating linear movement in the direction of awman r ar i e 6- i Al h drivin mechani ms assoanns atss in the f me 1 are separated from the operational parts of the press by the wall "2. It is therefore possible to provide a separate independent lubricating or cooling agent supply respectively for the driving mechanism on the one hand and for the operational parts of the press on the other hand. It is further readily possible, if required, to change the driving mechanisrn and the operational parts for others independently of one another. is possible to convert the press for the purpose of carrying out different pressing operations in short time and with the least possible effort.

The widely spaced sliding guides'lt) for the punch carriage 6 together with the afore-meutioned bearing play, ensure a highly accurate guiding of thecarriage. De pending upon the kind of pressing operations carried out, the material resistance to be overcome in a pair of tools located eccentrically relative to the horizontal centre plane of the carriage may be considerable. Also, correspondingly high tipping moments act on the slide. Owing to the high clearances of the sliding guides from the actual carriage itself, i. e. owing to the long lever arms, the additional bearing pressure caused by the tipping moments is kept comparatively low. 1 I

Due to the arrangement of the cutter 21 on the punch carriage 6, the bearing pressure of this carriage is, of course, increased somewhat when a blank 19a is cut off, Since the carriage 6 is supported in accordance with the invention, on the sliding bearing 10 in the manner of a cross-head, however, there results on the whole a considerably lowerv bearing pressure than in the known usual slide guides. ings of the shaft 14 in the rear wall 3 and the cheek 12 of the frame I prevent this shaft from developing a flutter. COnsequentIyQthe power" transmission from the shaft which executes an accurate linear movement, to the carriage 6 acts centrally, without the punches 7 deviating from their constructionally established lines of movement to one or the other side. i 1

The arrangement of'the cutting device 21 on the punch carriage 6 enables this device to be controlled by the carriage drive, and a separate drive for the cutting de@ vice is no longer necessary. This results in a particularly advantageous structural and operational simplification of the press constructed in accordance with the in.- vention, compared with the known presses.

The supplying of the rods 19 to the cutting device '21 through the hollow interior space 1a of the frame 1 at right angles to the direction of movement of the carriage 6, renders possible the disposal of the feeding device 18 within the existing overall length of the press. Furthermore, the whole feed mechanism lies outside the worklug space of the press and outside the punch and die sup.- ports. Therefore, this mechanism in no way hinders the construction of said pressparts in any way. The feedof the rods 19 effected at right angles to the direction of movement of the punch carriage 6 in the press constructed according to the invention, thus offers considerable ad vantages.

The gripper devices 22 and b acting as conveying'dev vices have adjustable or interchangeable tongs, in order to enable blanks or pressed articles of varying shapes and dimensions to be moved. Simply by changing the press tools and the tongs of the conveying devices, or correspondingly adjusting said tongs, it is possible in the press proposed by the invention, to change from one type of manufactured article to another without any other structural or operational alterations being required. Therefore, it is possible on this press to manufacture articles of extremely varied shapes and different dimensions, as long as the available driving power to the pre ss is sufiicient for the purpose. I

We claim: I l

1. In a forging machine forupsetting blanks, a frame and a die bloick fixedly mounted therein, are} ciprocatingcarriage having a punch mounted therein in alignment with the' dieblock, a slide bearing supporting By this means it The double, widely spaced mounthavi said carriage, a crank gear constituting the drive means for reciprocating the carriage, a shaft mounted in the frame for supporting said crank gear, said punch being longitudinally displaceable and adapted to execute an additional stroke, said punch comprising a lever pivotally mounted on the carriage, a-thrust member mounted on the carriage and having one arm engaging the other end of the lever, a cam disc rotatably driven by the drive means actuating said carriage, the other arm of said thrust member engaging the cam disc for imparting a reciprocating motion to the thrust member, the additional movement of said punch being derived from the cam disc at the forward position of the carriage.

2. A press as set forth in claim 1, and a fixed stand for said press, said stand presenting at the front working side thereof, a guide track extending over the whole length of said stand and adapted to receive the slide bearing of the punch carriage located on the same.

3. A forging machine as set forth in claim 1, and a connecting rod actuated by said carriage drive, a connecting pin rigidly connected with said connecting rod, a gear carried by said crank drive shaft, a second pin rigidly disposed parallel to said connecting pin, an arm rigidly arranged on said second pin, a second shaft, a

second gear mounted on said second shaft, said second gear meshing with said first gear, a rotary cam secured to said second shaft, said arm pivoted on said cam, said arm deriving from the rotary movement of the cam a swinging movement which it is adapted to transmit, in the form of a linear movement, to said longitudinally displaceable punch.

4. A forging machine as set forth in claim 1 and a closed box-line frame enclosing said slide bearing and carriage, said frame presenting a guide track adapted to receive said bearing and being formed below said guide track with a hollow space through which a cooling fluid is passed, the remainder of the box space being adapted to receive lubricating fluid for the elements of said press.

References Cited in the file of this patent UNITED STATES PATENTS 2,100,028 Frayer Nov. 23, 1937 2,106,275 Frayer Jan. 25, 1938 2,204,043 Maclagan June 11, 1940 2,205,585 Wilcox June 25, 1940 2,698,950 Van Haandel Jan. 11, 1955 2,721,343 Friedman Oct. 25, 1955

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