US2880867A

US2880867A - Displaceable die holder for power press

Info

Publication number: US2880867A
Application number: US435548A
Authority: US
Inventors: Keck Karl
Original assignee: L Schuler GmbH
Current assignee: L Schuler GmbH
Priority date: 1953-06-16
Filing date: 1954-06-09
Publication date: 1959-04-07
Anticipated expiration: 1976-04-07

Description

April 7, 1959 c DISPLACEABLE DIE HOLDER FOR POWER PRESS Filed June 9, 1954 g Q S INVENTOP KA K544 2,880,867 DISPLACEABLE DIE HOLDER FOR POWER PRES Karl Keck, Goppingen, Germany, assignor to L. Schuler A.G., Goppingen, Wurttemberg, Germany Application June 9, 1954, Serial No. 435,548

' Claims priority, application Germany June 16, 1953 6 Claims. (Cl. 2071) This invention relates to power presses for the manufacture of tubular articles.

An object of the present invention is to provide means facilitating more economical and eflicient operation of a press and ready and rapid assembly thereof, said object being accomplished by a slidably disposed die or matrix holder which cooperates with levers and pusher elements that mechanically change dies when said holder occupies a prescribed position to one side of its normal operative position.

It is another object'of the invention to provide means rendering the possibility of easily and efiicaciously interchanging the die in an extrusion or like power press in particular after such die has been subjected to appreciable wear, or has become inoperative on account of crust deposits or deformations.

It is still a further object of the invention to provide means ensuring ready access to the die holder after the same has been slidably displaced for the purpose of adjusting the die, and of effectuating the die assembly to provide further means conducive to accurate automatic registry of the die in the die holder of the press.

Yet a further object of the invention resides in the provision of means affording positive feeding of the die to the die holder by hydraulic or pneumatic pressure means passing through die feeding means.

Still another object of the invention is to provide means enabling rapid and safe assembly of a die with a die holder during operation of the press, in which another die and die holder are in operative position.

These and other objects, features and advantages of the invention will become apparent from the ensuing description and drawing which is merely exemplary.

In the drawing:

Fig. 1 is a fragmentary, elevational view, partly in section, of a table of a tube extrusion press equipped with two slidably disposed die holders, one of which being shown inoperative position and the other of which in the process. of receiving a die;

Fig. 2 is a top plan view of Fig. 1, certain parts being shown in section and die feeding means being shown in two different positions.

Referring now to Fig. 1, there is shown a table 22 of a tube extrusion press having a plunger 21 with a mandrel portion 16 connected thereto. Table 22 is provided with a pressure plate 90 having a central bore 91 which communicates with a conical opening 92 provided in the body of the press 1. A slide 44 is movable in lateral guides 93 in table 22. Said slide 44 may be reciprocated by a pneumaticor hydraulic-actuated piston rod 94 which is connected to a piston (not shown) and movable in cylinder 59. Slide 44 is provided with two large openings or apertures 96 in each of which is firmly at fixed by means of a respective ring member 97 a die hold er 23. The extent of movement of slide 44 is defined or limited through suitable abutment pieces 45 and 46 suitably disposed in the path of movement of slide 44 as may be clearly seen from Fig. 2.

To this end, slide 44 is provided with opposite abutment pieces for cooperation with abutments 45 and 46 so that if one die holder is in its operative position below the plunger 21 the other die holder is in its in operative position for receiving a new die. The slidable die holder 23 is further provided with a central bore 98 which is somewhat larger than bore 91 of the pressure plate 90. Bore 98 is further constructed to fittingly receive the die or matrix 24.

In table 22 are provided passageways 99 which are disposed to coincide or to be in registry with a central bore 98 of a respective die holder after the same is moved together with the slide 44 beyond the plunger 21 into extreme positions, as it is quite apparent from Figs. 1 and 2.

At opposite ends of the table and in the table there are provided elongated cut-out openings 100 which are laterally accessible as may be visualized from Fig. 1. In each of these cut-out openings 100 there is pivotally swingable about a vertical stud or pin 104, a feed lever in the form of an angle

lever having arms

102 and 103. Lever arm 102 is cambered or bent at an angle and enlarged at an extremity 101. This extremity 101 projects in its outwardly swung position beyond the confines of the table 22 and possesses a recess for the reception of a press die 24. Recess 105 communicates with a central hole 106. When double-

arm lever

102, 103 is swung into the press, it will be observed that passageway 99 coincides or is in registry with recess 105 and hole 106. A'

vertically movable pin or pusher element 107 is disposed below passageway 99 and is displaceable relative to the latter by means of a fixedly arranged piston 108 cooperating with cylinder 109 to which the lower end of pusher element 107 is connected.

With cylinder 109 a conduit 110 is connected which in turn communicates with an air compressor reservoir or receptacle (not shown) containing liquid or fluid under pressure. The free end of pivoted lever arm 103 is operatively connected to a piston rod 111 which carries a piston 112 which is driven either pneumatically or hydraulically in a cylinder 114, the latter being pivotally disposed at 113 as it is more clearly apparent from Fig. 2.

Feed lever

102, 103 and pusher element 107 form means or a device for the insertion of a press die 24 to be received in die holder 23.

The press die 24 as seen in the center of Fig. 1, is in registry with mandrel 16 and in operative position with the latter. If a press die is to be removed or interchanged, the displaced right hand die holder 23 may be loaded or fitted with a press die (not shown). It will be readily realized that if the die holder 23 is in a displaced position and

feed lever

102, 103 is swung toward the press, the die 24 will first be removed by means of a hammer and chisel, so that the used die 24 falls through passageway 99 into recess 105 of lever arm 101.

r This feed lever is subsequently outwardly swung by means of the pneumatically or hydraulically operated piston 112 (as seen on the left-hand side of Fig. 2 partly in dicated in full lines) and the used-up or worn die will be discarded and a new press die is inserted into recess 105 whereupon the

feed lever

102, 103 is again swung into feed position (as seen on the right-hand side of Fig. 2 and indicated in dot and dash lines).

As soon as lever arm 101 is again positioned below passageway 99 and bore 98, pusher element 107 is moved upwardly under the pressure of compressed air or hydraulically, whereby said element 107 enters hole 106 of recess 105 and moves a new press die 24 (not shown) into bore 98, as will be readily understood. Pusher element 107 remains in its rest position but in such manner its end face comes to lie flush with the table until the press die is to be again exchanged or replaced.

Feed means 102, 103, 107 facilitate removal and in- 44. Such feed means for a new die are operable below the bore 98 of the respective die holder in its displaced position (as seen on the right hand side of Fig. 1).

Instead of theslide with two die holders adrum-shaped device with several die holders may be employed, for which feed means may be suitably disposed together with a device for ejecting or pushingout an old and used-up die.

The invention further contemplates means for automatically controlling the oscillatory movements of the feed levers and the rising or vertical movements of pusher 107 which is employed to facilitate insertion of a new die.

It is apparent that various changes may be made in the details ofconstruction and that various combinations of the features thereof can be used without departing from the spirit of the invention except as defined in the appended claims.

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

1. A power press of the character described comprising a plurality of die holder means arranged for slidable displacement from and to the mandrel of the press, each die holder means being provided with a central bore, a fixed support for said die holder means and provided with a central opening and further provided with elongated cut-out openings at either side of and spaced from said central opening of said support, passageways in said support and communicating with said cut-out openings, respectively, feed means in said cut-out openings and movable in registry with said passageways, respectively, and pusher means below said support and movable into said respective passageways and for registry with the central bore of one of said die holder means when the same is displaced for registry of its central bore with the corresponding passageway, whereby upon insertion of a die in said feed means and subsequent movement of the latter into registry with said corresponding passageway of said support said pusher means will press said die through said passageway into said central bore of said one die holder means.

2. A power press having a mandrel for cooperation with a die, comprising a plurality of die holder means arranged for slidable displacement from and to the mandrel of the press, each die holder means being provided with a central bore for receiving therein a die, a fixed support, for carrying said die holder means during displacement, said support being provided With lateral and elongated cut-out openings spaced from the center of said support, passageways in said support and communicating with said cut-out openings, respectively, power-actuated feed means'in said cut-out openings and movable in registry with said passageways respectively, and power-operated pusher means below said support and movable into respective passageways and for registry with the central bore of one of said die holder means when the same is displaced for registry of its central bore with the respective passageway of said support, whereby upon insertion ofa die in said feed'means' and subsequent movement of the latter into registry with the respective passageway said pusher means'win press said die through said passageway into said central bore of saidone die holder means.

3. A power press according to claim 2, said feed means including pivoted two-armed lever means, and means adapted to swing said lever means to and fro the respective passageway for receiving and discharging a die from said lever means;-respectively.

4. A power press according to claim 3, said lever means being provided with a recess corresponding to the size of said die, said recess being further provided with a hole through which said pusher means will be guided for moving said die from said lever means into said central bore of said one die holder means.

5. A power press-according to" claim 2, including power-actuated means, and means connecting said poweractuated means with said die holder means for moving the same froma central position on said support in which said bore of one of said die holder means is in registry with a central opening provided in the center of said support to a position remote from said central opening in which said bore of said one die holder means is in registrywith thecorresponding passageway for removing a used up die from said one die holder means into the corresponding passageway and for transfer to the corresponding lever means.

6. In a power press; die holder supporting means, a plurality of die holders arranged on said die holder supporting means and for removal therefrom, said die holder supporting means being movable from an operative position to an inoperative position, each die holder being provided with a bore, die member receiving means arranged for movement at right angles to the respective bore of one of said die holders when the latter is in said inoperative position, and operable means arranged for movement in the direction of the axis of said respective bore and in registry with said die member receivingmeans, so that a die member when placed in said die member receiving means may be moved by said operable means into the respective bore of one of said die holders for position therein, while another of said die members assumes an operative position and is carried by its die holder in the bore thereof for cooperation with a mandrel.

References Cited in the file of this patent UNITED STATES PATENTS Germany Jan. 19, 1932