FR2496512A1 - PRESSES, FOR EXAMPLE PRESSES FOR DRILLING OR DILATION, INTENDED TO ACT ON METAL BILLETS - Google Patents

Abstract

THE INVENTION RELATES TO A PRESS INTENDED TO ACT ON METAL BILLETS. THE PRESS INCLUDES MEANS INCLUDING A FIRST AND A SECOND METAL WORKING TOOL ARRANGED CONCENTRICALLY, CARRIED BY A DISCHARGE ROD 10 EQUIPPED WITH AN INTERNAL BORE 13 ARRANGED AXIALLY AND A CHUCK 12 THAT CAN MOVE IN THE BALLING OF THE ROD DISCHARGE, THE DISCHARGE ROD AND CHUCK BEING CONNECTED, WHEN THEY ARE IN THE ACTIVE POSITION IN THE PRESS, TO THE PRESS RESPECTIVE MOVABLE CROSSBARS. THE PRESS IS ALSO EQUIPPED WITH A TOOL HOLDER 11 INTENDED TO SUPPORT THE DISCHARGE ROD 10 IN THE ACTIVE POSITION COAXIAL TO THE AXIS, THE TOOL HOLDER BEING MOUNTED SO TO MOVE ON GUIDING MEANS ARRANGED CROSS-CUTLY TO THE AXIS SHAFT, SO AS TO SIMULTANEOUSLY MAKE A DISCHARGE ROD 10 AND A CHUCK 12, LOCATED IN IT, TO A POSITION REMOTE FROM THE AXIS WHEN THE DISCHARGE ROD AND THE CHUCK ARE DETACHED FROM THEIR RESPECTIVE CROSSBARS. APPLICATION TO DRILLING OR EXPANDING PRESSES.

Description

- 1 - Presses. for example, presses for drilling or expanding,

  intended to act on metal billets.

  The invention relates to presses such as drilling presses or expanding presses for acting on metal billets and comprising first and second concentrically arranged metal working tools carried by a discharge rod having an internal bore disposed therein.

  axially and a mandrel that can move within the

  the displacement rod and the mandrel can move, either together or separately, along a common axis (advantageously the geometric axis of the press) to act on a billet metal supported, during the operation of the press, in a receptacle I billet mounted in the press. In a press of the types envisaged, the delivery rod and the mandrel are respectively connected to movable sleepers of the press, the sleepers being guided (in a well-known manner) so as to move, either separately or together, to perform desired axial movements of the push rod and mandrel during various

  stages of a cycle of press

  the sleepers being provided by jacks

Hydraulic.

  In a punch press, the mandrel is of the drill bit type and during a cycle of press operations, the delivery rod and the drill mandrel first move together to apply pressure to one end of a massive metal billet. supported in the billet receptacle (the billet having, when placed therein, a slightly smaller diameter than that of the receptacle), so as to "push back" the billet and to cause it to expand to the full diameter of the receptacle. The piercing mandrel is then advanced relative to the delivery rod so that the mandrel pierces the billet. During the operation, the material of the billet, which is moved by the advancing mandrel,

  flows around the mandrels, which is

  put by a retraction of the push rod.

  In an expanding press, the discharge rod is provided with a detached nose (which is retained in the discharge rod in a well-known manner) and the mandrel is a mandrel said to expand, these tools being designed to cooperate during a cycle of operations of the press, so as to expand a billet (which was previously machined to form an axial perforation for receiving the mandrel) to prepare the subsequent work in a spinning press for the manufacture of tubes or hollow body. It is understood that the invention is applicable to presses of the type to be drilled or the type to be expanded, but for the sake of convenience, only a press of the type described herein will be described.

  type to be drilled which serves to illustrate the invention.

  In presses of the types considered, it is

  known to connect a mandrel to its cross by means of a.

  mandrel mount having a screw between the mandrel and the mount. With such an arrangement, to change the mandrels, it is necessary to detach the old mandrel from the frame and connect to it a new mandrel, geometric pressure of the press,

  which is frequently a difficult and time-consuming operation

  This is because of the weight of the mandrels and the possibility of screwing in or screwing the screw. In order to overcome these difficulties, it has been proposed to provide, in presses of this kind, supports for several mandrels and means for moving the supports relative to the axis of the press, so that can bring to the active position a selected mandrel and connect it to its mount in the press to use it while maintaining

  or replace one other mandrel.

  To further facilitate the change of tools

249651,

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  metal working in a press of the types considered

  The invention provides a press for acting on metal billets by means comprising a first and a second metal working tool arranged concentrically with a rod of

  discharge with an axially arranged inner bore

  ment and a mandrel that can move in the bore of the delivery rod, the delivery rod and the mandrel being connected, when in position

  active in the press, to mobile sleepers respec-

  of the press, the sleepers being guided in a main frame of the press so as to move, separately or together, to effect the desired movements of the discharge rod and the mandrel along a common axis (for example geometric axis of the press) during various stages of a cycle of operations

  of the press on a billet supported in a reception

  billet tackle mounted in the press, the movements of the sleepers being provided by hydraulic cylinders, press characterized in that it is provided with a tool holder for supporting the discharge rod in active position coaxial with the axis , the tool holder being mounted so as to move on guide means arranged transversely to the axis, so as to simultaneously bring a discharge rod and a mandrel, housed therein, at a position remote from the axis when the discharge rod and mandrel

  are detached from their respective sleepers.

  According to one embodiment, the press defined below

  above is characterized in that the guide means comprise a pair of locking and guiding members which, when a tool holder is in the active position, are designed to lock the tool holder in this position, a rod of With the delivery being mounted on it and in the position of cooperation with its cross-member, the press also comprises means making it possible to move the blocking and guiding members in the desired direction in order to unlock the tool-holder and release it so that it can move, along the blocking and guiding members, towards its remote position. Advantageously, the press is provided with resilient means serving to urge the locking and guiding members towards the locking position and means actuated by fluid pressure serving to urge them against the action of the elastic means, in the desired direction for release the tool holder. In addition, according to a preferred embodiment, the press

  is characterized by the fact that the crossing on which

  the tool holder is blocked by the locking and guiding members is provided with a pressure ring intended to cooperate with a discharge rod supported by the tool holder, an opening of the ring being designed to receive a pin formed on the discharge rod for the establishment of the rod on the axis of the press, the structure and arrangement being such that when moving the locking and guiding members to release the tool holder in In view of the movement, the delivery rod thus lowers to remove the pin from the opening of the pressure ring. According to a preferred embodiment, the press described above is characterized in that the movable crosspiece, intended for the mandrel, is provided with a

  mandrel mount having a connecting member

  The mandrel portion of the mandrel is adapted to receive a portion of the mandrel, the structure and arrangement being such that when the tool holder moves toward its remote position, the head portion of the mandrel slides out of the split link member. In addition, the tool holder is

  equipped with means for supporting the mandrel

  of the discharge rod during the movement of the tool holder between the active and the remote position. Advantageously, the press is characterized

  in that the means supporting the mandrel

  take a latch that can move, under the action of elastic means, towards a position in which it engages below a collar of the mandrel

  and that means are provided to automatically remove

  the latch from its position of application to the mandrel, when the tool holder completes its movement to the active position and that the head portion of the mandrel cooperates with the connecting member

split of the mandrel mount.

  Preferably, the described press comprises supports carried by a main press house,

  transversely to the press, freed from

  movable and intended for your guides on which the tool holder can be moved away from the locking and support members when the tool holder moves to its remote position. Advantageously, the guides above are mounted on a transfer table that can move along the supports between a position where the guides are aligned on the locking and guiding members that support the tool holder when it is active position. in the press, and a distant position o a

  discharge rod and a mandrel carried by a holder

  tool supported by the guides, can be removed for maintenance and replacement. In addition, the table

  transfer system preferably includes guides

  to support a second holder

  tool provided with a discharge rod and a mandrel ready to be transferred to the active position in the press. With such an arrangement, it is possible to quickly replace one Tool Set with another, without having to stop the press for a considerable time. In addition, the use of quick release links between the tools and their respective sleepers further facilitates the operation of

  tool change without risk of damaging screw

  such as those used in certain provisions

  classic press releases. A press according to the invention

  -6_ tion may include two transfer tables and

  associated tool holders, arranged in front and on

  of the press. Or again, transfer tables can be dispensed with, but two tool holders can be mounted on appropriate guide means and movable transversely to the axis of the press to remote positions one at the rear of the machine. press and the other at the front of it. It will be understood that by using a press arrangement in which a tool holder for a discharge rod and a mandrel is brought to a remote position where the tool holder is then supported by a portion of the press frame. and not on a support projecting from a movable cross member, it is avoided to apply to this cross member unbalanced forces that would be generated if a toolholder and tools supported by it

  were mounted on such a support exceeding.

  Preferably, a mount for connecting a mandrel to its cross member includes means for adjusting the effective total length of the mandrel mount and thereby adjusting the axial position of the mandrel relative to the associated delivery rod. which facilitates the precise assembly of the press tools

for action on a billet.

  In order to maintain a precise control of the metal working tools in a billet drilling operation so as to ensure a satisfactory drilling,

  a set of tools, including a push rod

  The inner bore has an axially arranged inner bore

  and a mandrel placed in the bore of the discharge rod

  for use in a press as described above.

  above, preferably comprises guide means for maintaining the concentricity between the mandrel and the discharge rod during a billet piercing operation. An advantageous embodiment is characterized in that the diameter of the mandrel is a little smaller than that of the internal bore of the discharge rod and that the guide means comprise a collar disposed on the mandrel near the its head and having a diameter such that it engages slidably in the bore, and a guide sleeve provided near an end portion of the bore of the discharge rod to ensure the guiding of the mandrel at its exit from the bore in an operation

Billet piercing.

  According to an embodiment facilitating movement

  of a tool holder between an active position and a posi-

  distance without imposing any restrictions on the

  the presses in service, the press defined above, provided with the locking and guiding means defined above, and supports carried

  by the main group and intended for guides on

  which a tool carrier can be moved, preferably comprises means actuated by a driving force,

  mounted on the supports and for removing a holder

  tool of the active position along the guides, the

  means actuated by a driving force being automatically

  connected to the tool holder when the crosspiece supporting the tool holder is moved to a position where the locking and guiding members are aligned with the

  guides, while said means are separated from the holder

  tool when the crosshead moves in a cycle

of press operations.

  We will now give, with reference to the attached drawings,

  a more detailed description of a press planned by

  the invention and illustrating it and which is a punch press of the species mentioned above. However, it is understood that this press is chosen only

as a non-limiting example.

  In the accompanying drawings, FIG. 1 shows the general arrangement of a first form of the punch press taken as examples in vertical section passing through the axis of the press. FIG. 2 is a section taken in the same plane. - that Figure 1, but on a larger scale, showing a drill chuck, a discharge rod and associated parts, and means comprising a tool holder and for passing the mandrel and the discharge rod of the active position on

  the axis of the press to a distant position for the

  FIG. 3 is a diagrammatic representation, in section in the plane along the line AA of FIG. 2, showing positions taken by the tool holder during the removal and the change of a mandrel and a rod. refoulement; Figure 4 is mainly a section along the plane BB indicated in Figure 2, showing a mandrel and a discharge rod on their associated support, removed from the axis of the presset a second toolholder with mandrel and associated discharge rod in a remote position, took to being brought to the active position; Figure 5 is a view mainly in section in the C-C plane shown in Figure 2, showing means for supporting and locking a tool holder in the active position in the press; FIG. 6 is a plan view (partially a section) of a tool holder and associated parts serving

  to support a mandrel and a push rod

  the movement between the active position and the posi-

  remote location; Fig. 7 is a vertical section in the plane FE of Fig. 6, showing the tool holder and associated parts; Fig. 8 is a section of the tool holder and associated parts in the plane FF shown in Fig. 7, and Figures 9, 10 and 11 are schematic representations, generally similar to Figure 3, -9. but showing positions that can be occupied by tool holders in variants of the press

serving as an example.

  With reference to FIG. 1, the press taken as an example, in the first embodiment of the invention,

  to write, includes a main frame comprising two

  1 (of which only one is shown in Figure 1), interconnected in a well known manner by sleepers

  fixed upper and lower 2. At the building are associated

  in order to slide (well

  known), two movable crosspieces 4, 5, the superstructure

  upper support 4 (as described below) a drill chuck 12 (see Figure 2) and the lower cross support (also as described below) a discharge rod 10. As shown in Figure 2, the push rod 10 has an axially disposed inner bore 13 in which the mandrel 12 can move as described hereinafter # the discharge rod and the mandrel having a first and a second metal working tool which during a cycle of operations of the press, can move, either together or separately, along a common axis located on the geometric axis XX of the press (Figure 1), so as to act on a supported metal billet,

  during the operation of the presses in a receiver

  Billet tackle 7 mounted in the press in a well known manner.

  As shown in Figure 1, the receptacle with

  7 is one of two receptacles 7, 8 housed in a billet receptacle mount assembly 6 which

  is mounted so as to turn around a vertical tree

  cal 106 standing on the lower fixed crossbar 3, so as to alternately bring the receptacles to

  billet 7, 8 to the active position, in a well known manner.

  However, the invention is not limited to presses having the particular arrangement of mount of

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  billet receptacle which is described. The billet receptacle 7 is adapted to support, in the active position, a billet of heated metal with a

  together called support, well known structure.

  The support assembly is indicated by the general reference 9 in FIG. 1 and will not be described in FIG.

detail here.

  The upper movable cross member 4 is connected to a piston 65 of a hydraulic jack 66 supported by the upper fixed cross member 2 and the mandrel 10 is worn.

  (during the operation of the press) by a

  mandrel 35 from the crossbar 4 downwards.

  Detachable links (not shown, but of known structure) are provided between the upper and lower movable links 4, 59 so that they can move together or separately, depending on the

  needs, during a cycle of press operations.

  The piston 65 may thus have the effect of moving together, downwards, the two crosspieces 4, 5 during a part of the cycle, after which the crossbar 4 can move downwards relative to the crosspiece 5 during a drilling operation. of billet. Other hydraulic cylinders (not shown) are provided to ensure the return movements of sleepers 4, 5

as required.

  In order to ensure satisfactory guidance of the mandrel 12 relative to the delivery rod 10 during a

  billet drilling operation, the mandrel (which pre-

  feels on most of its length, a diameter

  _30 a little smaller than the bore 13 of the rejection rod

  lement) is equipped with an upper neck 41 of the diameter

  wanted to adjust by being able to slide in the bore-

  13, while the lower end portion of the discharge rod 10 is provided with a bushing of

  guide 42 housed inside the bore 13, of

  to maintain exactly the drill core aligned concentrically with the bore 13 of the rod of

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  delivery 10 during the drilling operation.

  We will now describe how the stem of

  10 and the drilling mandrel 12 are sup-

  carried in the press to move between an active position and a remote position when

  wants to change the mandrel and the discharge rod.

  An upper part of the discharge rod is provided with a rim 110 (see FIGS. 2 and 5), by which it is supported on a shoulder 111

  provided in a tool holder 11 and surrounding an opening

  provided in the tool holder and through which

the rod 10 passes from top to bottom.

  The tool holder 11 is constructed in the manner shown

  presented in more detail in Figures 6, 7 and 8.

  shoulders 113 (Figure 8) extend along

  opposite side portions of the tool holder 11 and these sponges.

  The elements are slidably mounted in guides 115 (FIG. 5) of two guide members.

  and locking 117 formed on arms 27 which are

  pivotally on 28 supported shafts

  by the cross member 5 on either side of the tool holder 11.

  Inner end portions of the arms 27, forming

  the guiding and locking members 117 are engaged

  quoted upwards relative to the crossbar 5 by

  several tie rods 30 (FIG. 5) passing, in the direction

  height, through bore sizes

  exaggerated in cross-section 5, the final parts

  lower arms being articulated to the members 117 and the upper end portions being

  equipped with a head and supported by a series of

  Belleville spells 31. The springs solicit normal

  the guide members and upwardly blocking to block the tool holder 11, the flange 110 of the discharge rod 10 being blocked against a pressure ring 29 carried by the bottom of the crossbar 5, As

  as shown in Figures 5, 6 and 7, the push rod

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  10 is provided with a pin 34 projecting slightly, for the precise establishment of the -pump rod inside the pressure ring 29

  (coaxially to the geometric axis of the press).

  When it is desired to release the discharge rod and the tool holder 11, so that they leave the active position on the axis of the press, the guide and blocking members 117 are moved downward (by a slight pivoting movement of the arms 27 around their shafts 28) under the action of the hydraulic fluid applying to pistons 33 housed in cylinders 32 from the crossbar 5 downwards, the pistons 33 acting on the upper surface of the

  organs 117 against the action of Belleville springs 31.

  The movement of the arms 27 under the action of the pistons 33 is limited, by any appropriate means, to a size sufficient to unlock the rod 10 relative to

  the pressure ring 29, the rod 10 lowering suf-

  to allow the pin 34 to disengage from the ring 29. The tool holder can then be moved

  11 along the guides 115, as described below.

  The piercing mandrel 10 is detachably retained in a split connecting member 36 screwed to a lower end portion of the mandrel mount 35. The member 36 is provided with a slot 137, extending from a side of the mandrel. member and adapted to receive a head 138 of a mandrel 12. Just below the slot 137 (Figure 2), the connecting member 36 has a portion 139 (C-shaped, seen from the lower end of the connecting member) which surrounds a neck of the mandrel, just below the head 138. The dimensions and arrangement of the cooperating parts of the mandrel and the connecting member are such as to ensure a reasonably tight and firm fit Parties

  while allowing the chuck to move laterally

  relative to the axis of the press to detach the mandrel from the mount when the tool holder 11 is

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  moves along the guides 115, so that the mandrel 12 and the rod 10 can be removed together from the active position, while the mandrel remains housed in

the bore 13 of the rod 10.

  In order to prevent the chuck 10 from falling through

  the bore 13 when detached from the connecting member

  its 36 as a result of a lateral movement of the tool holder 11, the latter is provided with a locking device

  mandrel shown in Figures 2, 6, 7 and 8.

  The locking device comprises a latch 37 which is guided to move toward and away from the mandrel 12 in a guide device 143 attached to an upper surface of the tool holder, so as to pass through an opening 145 traversing the same. here in

  the direction of the height (see Figures 7 and 8). Pen

  With the movement of the tool holder, the latch is intended to be applied to the mandrel 12 below a collar 141 (FIG. 6) thereof (the free end portion of the latch being curved properly so as to correspond to the circumferential surface of the part of the mandrel which is just below the collar 141) and therefore, to support the mandrel inside the

discharge rod 10.

  To move the latch to the position of

  the mandrel, a lever 38 is housed in the opening

  and has an upper terminal part stenga-

  inside a slot 146 (Figure 6) of the latch. The lever is fixed to a transverse shaft 147 (FIG. 8) housed inside the tool holder 11 by means of

  appropriate landing arrangements. To the parties

  In the opposite direction of the shaft 147 are two parallel arms 148 connected by connecting rods 150 to push rods 39 slidably mounted in appropriate bores of the tool holder 11, bores being located in the direction of movement. of the tool holder. Springs 152, placed around the rods

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  39 between the ledges 154 of the push rods

  and end caps 156 (FIG. 7) screwed into the bores urge the push rods to the right (relative to FIGS. 6 and 7) and thereby act (via the arms 148 of the transverse shaft 147 and lever 38) to bias latch 37 to the chuck support position. When the tool holder 11 is moved to the right of FIGS. 2, 6 and 7 to place a delivery rod 10 and a mandrel 12 in the active position in the press, the head 138 of the mandrel being placed in the connecting member 36, the end portions of the push rods 39 apply to fixed stops 40

  (mounted in a fixed manner on the crossbar 5 of any type

  appropriate) Just before the completion of this movement,

  of the tool holder, so that the final part of this movement has the effect of moving the push rods 39 to the left (relative to FIGS. 6 and 7) so as to withdraw the latch 37 from its position

chuck support 12.

  A frame assembly 20 is fixedly attached to the uprights 1 of the press frame (see FIGS. 1, 2 and 4) and placed transversely between the uprights 1 at the rear of the mobile crosspiece 5. The frame assembly 20 supports two guides 24, 25 (see Figure 2) on which is supported, so as to slide, a transfer table 22 which can move in the direction of the width of the press, in a plane

  extending between the amounts of the main frame

  cipal, these movements of the transfer table being provided by a hydraulic cylinder whose cylinder 125 is supported by the frame assembly 20 and whose

  piston 126 is connected to the transfer table (see Figure 4). On the transfer table are mounted two pairs of guides 21,

  21 and 211, 21 '. When the transfer table 22 occupies the position represented by the

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  4, the guides 21 are placed in such a way that they form, in fact, extensions of the guides

  guide and locking members 117 (Figure 5).

  It is understood that the frame assembly 20 is placed on the press frame in the desired height position relative to the cross member 5, when the latter is maintained at a certain height position (i.e. position in which she

  shown in Figure 1), the guiding

  and blocking 117 being in their unlocked position.

  That is, the tool holder 11 is released and can be moved, at the same time as the delivery rod 10 and the mandrel 12 which supports it, along the guides 115 to bring it on the guides. 21, 21 of the transfer table the table being provided with a recess in which is housed the rod 10 (see figures

2 and 4).

  The frame assembly 20 supports a pair of rails 19, 19 spaced in the direction of the width of the pressure as seen in Figure 4, and along which can move a carriage 14 (see Figure 2) with wheels 18 rolling on the rails. The movement of the carriage 14, along the rails 19, is provided by a hydraulic cylinder whose cylinder 17 is supported by a frame element located between the rails 19 and whose

  the piston rod 127 is connected to a lower part

  1 of the carriage on which is formed a downwardly directed tongue which, when the piston rod 127 is in the extended position shown in FIG. 2, is adapted to penetrate into an upwardly directed groove 16 formed in the door 11, when the tool holder is in the active position and the crosspiece 5 is in its raised position as shown in FIG.

figure 2.

  The guides 21 ', 21' (FIG. 4) of the transfer table 22 are designed to support a second

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  tool holder 11 'carrying a delivery rod of

  replacement 10 and an associated mandrel 12 ', and the

  between the two sets of guides 21, 21 and 21 ', 21t

  is such that once a carrier has been removed

  11 of its active position shown by X in Figure 3, in its retracted position indicated by Y1 in Figures 3 and 4, and that the piston rod 126 has been deployed to move the transfer table 22

  along the guides 24, 25 until the holder

  11 and the rod and the mandrel it supports arrive at a displaced position indicated by Y2 in Figures 3 and 4, the tool holder 11 'with the replacement rod 10t and the mandrel 12tqu'it supports

  are transferred from position Y to y1 where the holder

  11 'tool is ready to be moved from the Y1 position to the active position on the X axis of the press (Figure 3) by the deployment of the piston 127 (Figure 2), up to a limit determined by the application of the tool holder to a stop 26 (Figure 2) supported by the crossbar 5, the pin 32; the pressure port is then located below the opening of the pressure ring

  29. It is understandable that the movement of the transport table

  as described above, has the effect of clearing the groove 16 of the tool holder 11 of the tongue 15 of the carriage 14, and thus to introduce the tongue in the corresponding groove 16 'of the tool holder 11t . Once the tool holder 1i 'has been brought to the active position, the mandrel 12' and the rod 10 'being located

  on the axis of the press, the hydraulic pressure is released.

  the cylinders 32 to allow the Belle-Belle springs to

  city 31 to act again on the tie rods 30, pivoting the arms 27 upwards, so that the

  guiding and locking members 117 block the holder

  11i tool and the rod 10 'in the active position on the tax press, the push rod being applied

  against the pressure ring 29. The passage of the holder

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  tool at the active position has the effect that the tite 138 'of the mandrel 12t enters the slot 137 of the connecting member 36, establishing the connection between the mandrel 12t and the mandrel mount 35, and therefore between the mandrel and the drilling beam 4.

  It is important to maintain the correct relationship

  height between the lower end portions of the mandrel 12 and the delivery rod 10, and for this purpose, the press as an example comprises means

  for adjusting the overall length of the mandrel 35.

  Although these adjustment means may be of any suitable form, it is advantageous for the mandrel mount 35 to be formed of two parts, an upper part 35a fixedly connected to the crossmember 4, and a lower part 35b, connected to the upper part. connecting member 36 which supports the mandrel. The two parts

  a and 35b of the mandrel mount are advantageously

  interconnected by a connecting member 161 which is screwed into the parts 35a and 35b by threads of opposite pitch, so that the rotation of

  the liaison agency shall adjust the time

  the totality of the mandrel mount. Preferably, the rotation of the connecting member 161 is provided by a motor drive housed inside a housing

  162 surrounding the mandrel mount 35.

  The machine taken as an example can be provided with provisions carrying mandrel and rod of

  repression of somewhat modified forms

  to what is described above, the modified forms

providing different combinations of tool holders and associated parts, designed so that the tool holders can be moved to bring chucks and delivery rods onto the axis of the press and out of this axis, following indicated routes

  generally in Figures 9, 10 and 11.

  The modified arrangement represented by Figure 9

24965 12

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  comprises two tool holders 11 and 11l, the tool holder 11 having been moved from a position where it sets up a mandrel and a discharge rod on the axis X of the press, at a displaced position W2. The second tool holder 11i, as shown, occupies a position W3 moved rearward where it is ready to be transferred to the active position for the establishment of another mandrel and another push rod in active position on the X axis. A press comprising the arrangement of FIG. 9, while generally similar in shape to that of FIGS. 1 to 8, is modified in that it does not require a transfer table. , such as table 22, nor the associated parts. It will be evident that the press will have a suitably modified guiding arrangement for tool holders 11 and 11 and duplicate cylinders (generally similar to that which includes cylinder 17 of FIGS. 1 and 2), one to one before and one at the back of the press. In addition, the mandrel mount 35 should have a modified split link member (see linker 36 described above) to allow the mandrels to move forward and backward relative to the axis of the press, and modified stops (see stop 26) should be provided to position

  activates one or other of the tool holders 11 and 11t.

  The modified arrangement represented by the figure comprises three tool carriers 11, 11i and 11 whose tool holders 11 and 11i are designed to be moved.

  between positions U1, U2 and U3 by a table of trans-

  and leave the position U1 and the active position on the X axis of the press as explained above with reference to Figures 1 to 8, while the tool holder 112 can be transferred directly between a position

  active on the X axis of the press and a displaced position

  V1, in a generally similar fashion

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  to the tool holder 11 of the arrangement of Figure 9.

  The modified arrangement of Figure 11 includes four tool holders 11, 11, 11 and 11 of which 11 and 11i

  can be supported by a first table of trans-

  tfrt, so as to move between positions S1 and S2 and between positions S3 and Sa the tool holder in position S1 can be brought to the active position on the axis X of the press, all as described above in the first form of the press example according to FIGS. 1 to 8. The tool holders il2 and 113 may similarly be supported by a second transfer table mounted so as to

  move across the front of the press

  between T1 and T3 and between

  T2 and T1 positions, the tool holder at position T can

  to be brought to the active position on the X axis of the press, provided that the two tool holders and 11i are in displaced positions at the rear of the press. All the arrangements shown in Figures 9, 10 and 11 are considered as returning

in the context of the invention.

  It will be understood that, to allow the transverse movement of a mandrel and a discharge rod on a tool holder, as described above, the pressure ring 29 (carried by the crosspiece 5) against which is blocked the part upper end of the discharge rod when in the active position, is provided with an interruption, through which also slides the latch 37 (see Figure 2) or, in the case of

  variants of Figures 9, 10 and 11, two interrup-

  diametrically opposed. The crosspiece 5 also has one or more recesses, as necessary

at the passage of the head of the mandrel.

  In each of the displaced positions, to which the various tools are designed to transfer the mandrels and the associated delivery rods for replacement or maintenance, a suitable lifting device (manually or powered) shall be provided for lifting the mandrel and the push rod relative to a tool holder, and also means for moving the push rods 39 of the tool holder against the action of the springs 152, so that the latch 37 is removed from its cooperation with the collar 141 of the mandrel, releasing the mandrel and the discharge rod so that they are removed from the tool holder by the lifting device. After the toolholder has been refilled with a mandrel and a discharge rod, the push rods 39 are released and spring loaded so that the latch 37 locks the mandrel and the delivery rod. in position on the tool holder o they are ready to be transferred back to the active position

in the press.

  Although he spoke in the description below,

  above a pair of guiding and locking organos 117, it is to be understood that a variant may be provided in which the locking members are separated from the

  guiding members and are operated independently.

- 21 -

Claims (16)

  1.- Press for acting on metal billets by means comprising a first and   a second metal working tool arranged   centrically carried by a discharge rod provided with an axially disposed inner bore and a mandrel movable in the bore of the discharge rod, the discharge rod and the mandrel being connected, when in position   active in the press, to mobile sleepers respec-   of the press, the sleepers being guided in a main frame of the press so as to move, separately or together, to effect the desired movements of the discharge rod and the mandrel along a common axis (for example geometric axis of   the press) during various stages of an operational cycle.   press on a billet supported in a   billet receptacle mounted in the press, the movements   the sleepers being provided by hydraulic cylinders   characterized in that it is provided with a tool holder (11) for supporting the discharge rod (10) in the active position coaxial with the tax, the tool holder being mounted so as to move on means guideways arranged transversely to the axis,   in order to simultaneously bring a rod of   ment (10) and a mandrel (12) housed therein,   a position away from the axis when the   roll and chuck are detached from their sleepers respective (4, 5).   2. Press according to claim 1, characterized in that the guide means comprise a pair of locking and guiding members which, when a tool holder is in the active position, are designed to lock the tool holder in this position, a discharge rod (10) being mounted on it and in a position of cooperation with its crossbar, the press also comprising _ 22 _   means for moving the locking and guiding members in the desired direction to release the tool holder and release it so that it can move along the locking and guiding members to its remote position. 3. Press according to claim 29 characterized in that it is provided with elastic means   used to solicit the locking and guiding   to the blocking position and means actuated by fluid pressure to urge them against the action of the elastic means, in the desired direction for release the tool holder.   4. Press according to claim 3 characterized   in that the cross-member (5) on which the holder   tool (11) is locked by the locking and guiding members is provided with a pressure ring (29) for cooperating with a discharge rod (10) supported by the tool holder (11), an opening of the 'ring   being adapted to receive an erect spindle (34)   on the pressure rod for the positioning of the rod on the axis of the press, the structure and the disposition being such that when moving the   locking and guiding members for releasing the holder   tool for movement, the push rod   thereby lowering to remove the pin from the opening pressure ring.   5. Press according to one of claims 2 to 4,   characterized in that the movable crosspiece (5) for the mandrel (12) is provided with a mandrel mount having a split link (36) for receiving a head portion of the mandrel (138), the structure and arrangement being such that when the tool holder moves towards its remote position, the head portion of the mandrel slides out of the split connecting member.   6. Press according to claim 5, characterized 24965t - 23 -   in that the tool holder (11) is provided with means for supporting the mandrel (12) within the delivery rod (10) during movement of the tool holder between the active and the remote position . 7. Press according to claim 6, characterized   in that the means supporting the mandrel   take a latch (37) that can move, under ltac-   elastic means, towards a position in which it engages below a collar (141) of the mandrel (12) and that means are provided for automatically removing the latch from its position of application to the mandrel when the toolholder completes its movement to the active position and that the chuck head portion cooperates with the body   split link (36) of the mandrel mount.   8. Press according to one of claims 2 to 79   characterized in that it comprises supports carried by a main frame (20) of the press, directed transversely to the press, cleared sleepers   mobiles and intended for guides on which the carrier   tool can be moved away from the locking and   support when the tool holder moves to its   nied. 9. Press according to claim 8, characterized in that the above guides are mounted on a transfer table (22) able to move along the supports between a position where the guides are aligned with the locking members and for supporting the tool holder when in the active position in the press, and a remote position where a delivery rod (10) and a mandrel (12) carried by a tool holder supported by the guides can be   removed for maintenance and replacement.   10. Press according to claim 9, characterized in that the transfer table (22) comprises 2496e 2 - 24 -   additional guides for supporting a second tool holder (11i) provided with a delivery rod and a mandrel ready to be transferred to the position active in the press.   11. Press according to one of claims 8 to 109   characterized by the fact that it is provided with several tool holders and that all necessary transfer means have the structure and the disposition required to ensure the movements of the tool-losses between the active and the remote positions, in any of the ways   represented by fiburs 3, 9, 10 and 11.   12. Press according to 1% one of claims 1 to 11,   characterized in that a mount (162) for connecting a mandrel to its cross member includes means for adjusting the overall effective length of the mandrel mount and thereby adjusting the axial position of the mandrel relative to the mandrel rod. associated repression. 13.- Set of tools comprising a rod of   flow together with an axially arranged inner bore   and a mandrel povarnt move in the bore of the discharge rod, can be used in a press   according to one of claims 1 to 12 and characterized   Pure guiding means are provided to maintain the concentricity between the mandrel and the discharge rod during a billet piercing operation. 14. Tool set according to claim 13, characterized in that the diameter of the mandrel (12) is a little smaller than that of the internal bore (13) of the discharge rod (10) and that the means of   guideways comprise a collar (141) disposed on the   a guide sleeve provided at an end portion of the bore of the discharge rod to provide - 25 -   guiding the mandrel as it exits the bore in a Billet piercing operation.   15. Press according to one of claims 8 to 11,   characterized in that on the supports are mounted means actuated by a driving force and for removing a tool holder from the active position along the guides, the means actuated by a driving force being automatically connected to the tool holder when the crosspiece supporting the tool holder passes to a position where the locking and guiding members are aligned with the guides, while said means are separated from the tool holder when the crossbar is   moves in a cycle of press operations.   16. Press according to claim 1, characterized in that it is provided with guide members and   at least one locking member which, when a holder   tool is in the active position, are designed to lock the tool holder in such a position, a rod of   repression being mounted on it in a cooperative position   With its crossmember, means are provided to move the locking member in the desired direction to unlock the tool holder and 1. release so that it moves along the guide members to its remote position.