EP3808472A1 - Tool and press - Google Patents

Abstract

The invention relates to a tool (1) which comprises an upper tool (30) and a lower tool (60) and is designed as a multi-stage tool, the upper tool (30) comprising n dies (A, B) and the lower tool (60) Includes n dies (a, b). Here, the dies (A, B) and the dies (a, b) can be positioned relative to one another in the horizontal direction in at least n positions (I), the n dies (A, B) of the upper tool (30) and the n dies (a , b) of the lower tool (60) are movable relative to one another in the horizontal direction in such a way that in a first position (I) for forming a first pair of dies (Ab) the first die (A) of the upper tool (30) and the n-th Die (b) of the lower tool (60) stand on top of one another that in an n-th position to form an n-th die pair, the n-th die (B) of the upper tool (30) and the first die (a) of the lower tool (60 ) stand on top of each other. (Figure 1)

Description

The invention relates to a tool and a press according to the preamble of claims 1 and 5, respectively.

From the DE 10 2015 112 959 A1 a press is known which comprises a press unit, a press ram, a press table and a tool, wherein a press stroke can be executed with the press ram when the press is actuated, the tool comprising an upper tool and a lower tool, the upper tool being connected to the press ram , wherein the lower tool is connected to the press table, wherein the tool is designed as a multi-stage tool, wherein the upper tool comprises n stages and wherein the lower tool comprises n stages.

It is the object of the invention to propose a tool or a press by means of which the loads can be reduced and non-productive times can be reduced.

This object is achieved on the basis of the features of the preamble of claims 1 and 5 by the characterizing features of claims 1 and 5, respectively. Advantageous and expedient developments are specified in the respective subclaims.

The tool according to the invention comprises an upper tool and a lower tool, the tool being designed as a multi-stage tool, the upper tool comprising n dies, the lower tool comprising n dies, in this case the dies of the upper tool and the dies of the lower tool are at least horizontal to one another n positions can be positioned, here are the n dies of the upper tool and the n dies of the lower tool are movable relative to one another in the horizontal direction in such a way that in a first position to form a first pair of dies (Ab) the first die (A) of the upper tool and the n-th die (b) of the lower tool are one above the other and that in an n-th position to form an n-th die pair (Ba), the n-th die (B) of the upper tool and the first die (a) of the lower tool are one above the other. Due to the mobility of the dies of the upper tool and the mobility of the dies of the lower tool, a position remains unchanged at which the pair of dies executing a forming step is formed, so that when the tool is actuated, a press is always loaded in the same area and thus an eccentric, The load increasing wear, tilting, etc. can be avoided.

It can also be provided that the upper tool of the tool comprises an upper displacement unit, the upper displacement unit comprising an upper base for connection to a press ram of a press unit and an upper die support, the upper dies being arranged on the upper die support and the upper die support Die support is guided movably in the horizontal direction on the upper base and that the lower tool of the tool comprises a lower displacement unit, the lower displacement unit comprising a lower base for connection to a press table of the press unit and a lower die support, the lower dies on the lower die support are arranged and wherein the lower die support is guided on the base movable in the horizontal direction. Such a tool can be operated in a press unit without the latter having to be converted for this purpose.

Furthermore, it can be provided that the upper die support is guided on the upper base so that it can be linearly displaced in the horizontal direction and that the lower die support is guided on the lower base such that it can be linearly displaced in the horizontal direction. Such a mechanism can be implemented in a structurally simple and inexpensive manner.

It can also be provided that the upper displacement unit comprises an upper drive, wherein the upper die support is movable relative to the upper base by means of the upper drive and that the lower displacement unit comprises a lower drive, the lower die support relative to the lower drive the lower base is movable. This makes it easy to automate the operation of the tool.

The press according to the invention comprises a pressing device and a tool, the pressing device comprising a press frame, a press ram and a press table, wherein a press stroke can be executed with the press ram when the press unit is actuated, the tool comprising an upper tool and a lower tool, the upper tool with the press ram, the lower tool being connected to the press table, the tool being designed as a multi-stage tool, the upper tool comprising n dies, the lower tool comprising n dies, the upper tool of the tool comprising an upper displacement unit, the upper Sliding unit comprises an upper base for connection to the press ram of a press unit and an upper die support, the upper dies being arranged on the upper die support and the upper die support on the upper base in the horizontal direction is movably guided and wherein the lower tool of the tool comprises a lower displacement unit, wherein the lower displacement unit comprises a lower base for connection to the press table of the press unit and a lower die support, the lower dies are arranged on the lower die support and the lower die support on the base is guided movably in the horizontal direction. Due to the mobility of the dies of the upper tool and the mobility of the dies of the lower tool, a position remains unchanged at which the pair of dies executing a forming step is formed, so that when the tool is actuated, the press is always loaded in the same area and thus an eccentric, The load increasing wear, tilting, etc. can be avoided.

It can also be provided that the tool of the press is designed according to at least one of claims 1, 3 or 4. This results in the advantages mentioned for the respective claims.

Furthermore, it can be provided that the upper die support can be moved along an upper travel axis of the upper drive and the lower die support can be moved along a lower travel axis of the lower drive, that the travel axes run parallel and that these travel axes run at right angles to a vertical axis y on which the press ram moves during a press stroke. This enables a central loading of the press ram with each forming step.

It can also be provided that the press is designed as a screw press. This allows the individual die pairs with Forming forces individually adapted to the respective die pair can be used.

• dass in einer ersten Stellung des Werkzeugs das erste Gesenk (A) des Oberwerkzeugs und das letzte Gesenk (b) des Unterwerkzeugs ein erstes Gesenkpaar (Ab) bilden, dass in der ersten Stellung des Werkzeugs bei geschlossenem ersten Gesenkpaar (Ab) das zweite Gesenk (B) des Oberwerkzeugs für eine Gesenkschmierung von unten zugänglich ist und das erste Gesenk (a) des Unterwerkzeugs für eine Gesenkschmierung von oben zugänglich ist,
• dass in einer zweiten Stellung des Werkzeugs das zweite Gesenk (B) des Oberwerkzeugs und das erste Gesenk (a) des Unterwerkzeugs ein zweites Gesenkpaar (Ba) bilden, dass in der zweiten Stellung des Werkzeugs bei geschlossenem zweiten Gesenkpaar (Ba) das erste Gesenk (A) des Oberwerkzeugs für eine Gesenkschmierung von unten zugänglich ist und das zweite Gesenk (b) des Unterwerkzeugs für eine Gesenkschmierung von oben zugänglich ist.

Finally, it can be provided in the press that the upper tool comprises a first die (A) and a second die (B), that the lower tool comprises a first die (a) and a second die (b),

• that in a first position of the tool the first die (A) of the upper tool and the last die (b) of the lower tool form a first die pair (Ab), that in the first position of the tool with the first die pair (Ab) closed the second die ( B) the upper tool is accessible from below for die lubrication and the first die (a) of the lower tool is accessible from above for die lubrication,
• that in a second position of the tool the second die (B) of the upper tool and the first die (a) of the lower tool form a second die pair (Ba) that in the second position of the tool with the second die pair (Ba) closed the first die ( A) of the upper tool is accessible from below for die lubrication and the second die (b) of the lower tool is accessible from above for die lubrication.

In such a press, for example, for die lubrication, regardless of the position in which the tool is, there is always the option of accessing one of the upper tools and one of the lower tools, so that the press does not have to be stopped for this and such non-productive times are eliminated.

Further details of the invention are shown in the drawing on the basis of exemplary embodiments shown schematically described.

Figur 1:

eine schematische Ansicht einer erfindungsgemäßen Presse und eines erfindungsgemäßen Werkzeugs in einer ersten Stellung der Presse und des Werkzeugs;

Figur 2:

eine zweite schematische Ansicht der erfindungsgemäßen Presse und des erfindungsgemäßen Werkzeugs in einer zweiten Stellung der Presse und des Werkzeugs;

Figur 3:

eine dritte schematische Ansicht der erfindungsgemäßen Presse und des erfindungsgemäßen Werkzeugs in einer dritten Stellung der Presse und des Werkzeugs;

Figur 4:

eine vierte schematische Ansicht der erfindungsgemäßen Presse und des erfindungsgemäßen Werkzeugs in einer vierten Stellung der Presse und des Werkzeugs und

Figur 5:

eine fünfte schematische Ansicht der erfindungsgemäßen Presse und des erfindungsgemäßen Werkzeugs in einer fünften Stellung der Presse und des Werkzeugs.

Here shows:

Figure 1:

a schematic view of a press according to the invention and a tool according to the invention in a first position of the press and the tool;

Figure 2:

a second schematic view of the press according to the invention and the tool according to the invention in a second position of the press and the tool;

Figure 3:

a third schematic view of the press according to the invention and the tool according to the invention in a third position of the press and the tool;

Figure 4:

a fourth schematic view of the press according to the invention and the tool according to the invention in a fourth position of the press and the tool and

Figure 5:

a fifth schematic view of the press according to the invention and the tool according to the invention in a fifth position of the press and the tool.

In the Figure 1 a tool 1 according to the invention is shown in a schematic side view. The tool 1 comprises an upper tool 30 and a lower tool 60. The tool 1 is designed as a multi-stage tool. The upper tool 30 comprises two dies A and b. The lower tool 60 comprises two dies a, b. The dies A, B of the upper tool 30 and the dies a, b of the lower tool 60 are in relation to one another can be positioned horizontally in at least two positions I and II. In the Figures 1 and 2 the upper tool 30 and the lower tool 60 or the tool 1 are shown in the first position I. In the first position I, the upper tool 30 is pushed to the right in the direction of arrow x and the lower tool 60 is pushed to the left in the direction of arrow x 'such that the first die A of the upper tool 30 and the last, second die b of the lower tool 60 together Form die pair Ab. A first forming process can be carried out on a workpiece W with the pair of dies Ab in the first position I of the tool 1.

• dass in der ersten Stellung I zur Bildung des ersten Gesenkpaars Ab das erste Gesenk A des Oberwerkzeugs 30 und das letzte bzw. zweite Gesenk b des Unterwerkzeugs 60 vertikal übereinander ausgerichtet sind und
• dass in der zweiten Stellung II zur Bildung des zweiten Gesenkpaars Ba das letzte bzw. zweite Gesenk B des Oberwerkzeugs 30 und das erste Gesenk a des Unterwerkzeugs 60 übereinander ausgerichtet sind.

In the Figure 1 the tool 1 or the pair of dies Ab is in an open position I-1 and in the Figure 2 the tool 1 or the pair of dies Ab is shown in a closed position I-2. In the Figures 3 to 5 the tool 1 or the upper tool 30 and the lower tool 60 are shown in the second position II. Here, the tool 1 is in the Figures 3 and 5 in an open position II-1 and in the Figure 4 shown in a closed position II-2. The two dies A, B of the upper tool 30 and the two dies a, b of the lower tool 60 can be moved relative to one another in the horizontal direction,

• that in the first position I for forming the first pair of dies Ab, the first die A of the upper tool 30 and the last or second die b of the lower tool 60 are aligned vertically one above the other and
• that in the second position II for forming the second pair of dies Ba the last or second die B of the upper tool 30 and the first die a of the lower tool 60 are aligned one above the other.

In the Figures 1 to 5 In addition to the tool 1, a respective pressing device 101 is shown in a schematic side view. The pressing device 101 comprises a press frame 102, a press ram 103 and a press table 104. Here, the tool 1 is arranged between the press ram 103 and the press table 104. The press ram 103 is arranged on the press frame 102 so that it can be moved vertically, optionally in the y-direction and y'-direction, so that a press stroke can be executed with the press ram 103 when the press device 101 is actuated.

A press P according to the invention is formed by the pressing device 101 and the tool 1 built into it. In the Figures 1 , 3 and 5 the press ram 103 is in a raised position P103-1 and in the Figures 2 and 4th shown in a depressed position P103-2. The tool 1 is built into the press unit 101, the upper tool 30 being connected to the press ram 103 and being able to move vertically in the y-direction or the y'-direction with the latter, and the lower tool 60 being connected to the press table 104.

In order to be able to change between the first position I and between the second position II, the upper tool 30 of the tool 1 comprises an upper displacement unit 31 and the lower tool 60 of the tool 1 includes a lower displacement unit 61. The upper displacement unit 31 includes an upper base 32 for Connection to the press ram 103 of a press unit 101 and an upper die support 33. The upper dies A, B are arranged on the upper die support 33 and the upper die support 33 is guided on the upper base 62 so as to be movable in the horizontal direction. The lower displacement unit 61 comprises a lower base 62 for connection to the press table 104 of the press unit 101 and a lower die support 63. The Lower dies a, b are arranged on the lower die support 63 and the lower die support 63 is guided on the base 62 so as to be movable in the horizontal direction. Both die carriers 33, 63 are each guided in a linearly displaceable manner on their base 32 and 62, respectively.

In order to be able to carry out the linear displacements of the upper dies A, B automatically along an upper travel axis x34, the upper displacement unit 31 comprises an upper drive 34 by means of which the upper die carrier 33 is relative to the upper base 32 and thus also relative to the press ram 103 of the Position I can be moved into position II and vice versa. In order to be able to carry out the linear displacements of the lower dies a, b automatically along a lower travel axis x64, the lower displacement unit 61 comprises a lower drive 64 by means of which the lower die carrier 63 relative to the lower base 62 and thus also relative to the press table 104 of the Position I can be moved into position II and vice versa. The travel axes x34 and x64 run parallel to one another and are at right angles to a vertical axis H103, on which the press ram 103 moves during a press stroke. The press P is designed as a screw press SP.

In the Figure 2 it is shown that the dies B and a of the second pair of dies Ba are accessible for die lubrication from below and from above in the first position I of the tool 1 despite a closed first die pair Ab. Die lubrication is carried out by a first spray head 105, which sprays the upper die B of the second pair of dies Ba, and by a second spray head 106, which sprays the lower die a of the second pair of dies Ba.

In the Figure 4 it is shown that the dies A and b of the first pair of dies Ab are accessible for die lubrication from below and from above in the second position II of the tool 1 with the second die pair Ba closed. Die lubrication takes place through the first spray head 105, which sprays the upper die A of the first pair of dies Ab, and through the second spray head 106, which sprays the lower die b of the first die pair Ab. Of course, instead of the drop lubrication described or in addition to the drop lubrication described, further service work can be carried out without extending the non-productive times.

• Figur 1: Der obere Gesenkträger 33 ist nach rechts in Pfeilrichtung x gefahren und der untere Gesenkträger 63 ist nach links in Pfeilrichtung x' gefahren, so dass das Werkzeug 1 in der Stellung I steht. Somit bilden das auf dem oberen Gesenkträger 33 angeordnete Gesenk A und das auf dem untern Gesenkträger 63 angeordnete Gesenk b das Gesenkpaar Ab. Der Pressenstößel 103 steht in seiner hochgefahrenen Stellung P103-1 und das Werkstück W ist in Form eines Rohlings eingelegt.
  Ablauf zwischen der Figur 1 und der Figur 2: Der Pressenstößel 103 wird nach unten in Richtung y' gefahren, das Werkstück W wird hierbei umgeformt.
• Figur 2: Der erste Umformschritt ist ausgeführt und der Pressenstößel 103 steht in seiner niedergefahrenen Stellung P103-2. Die nicht am ersten Umformvorgang beteiligten Gesenke B, a stehen seitlich über das aktive Gesenk Ab über und werden von den Sprühköpfen 105, 106 eingesprüht.
  Ablauf zwischen der Figur 2 und der Figur 3: Der Pressenstößel 103 wird vertikal nach oben in Richtung y gefahren. Der obere Gesenkträger 33 wird nach links in Pfeilrichtung x' gefahren und der untere Gesenkträger 63 wird nach rechts in Pfeilrichtung x gefahren, so dass das Werkzeug 1 in der Stellung II steht.
• Figur 3: Das Werkzeug 1 steht in der Stellung II und es besteht Zugriff auf das einmal umgeformte Werkstück 1, so dass dieses für den zweiten Umformschritt von dem Gesenk b in das Gesenk a gelegt werden kann.
  Ablauf zwischen der Figur 3 und der Figur 4: Der Pressenstößel 103 wird vertikal nach unten in Richtung y' gefahren, das bereits einmal umgeformte Werkstück wird ein zweites Mal umgeformt.
• Figur 4: Der zweite Umformschritt ist ausgeführt und der Pressenstößel 103 steht in seiner niedergefahrenen Stellung P103-2. Die nicht am zweiten Umformvorgang beteiligten Gesenke A, b stehen über das aktive Gesenk Ba über und werden von den Sprühköpfen 105, 106 eingesprüht.
  Ablauf zwischen der Figur 4 und der Figur 5: Der Pressenstößel 103 wird vertikal nach oben in Richtung y gefahren.
• Figur 5: Das Werkzeug 1 steht weiterhin in der Stellung II und es besteht nun Zugriff auf das zweimal umgeformte und damit fertig geformte Werkstück W. Somit kann das Werkstück W dem Gesenk a entnommen werden. Weiterhin wird ein weiteres Werkstück W' in das Gesenk b, welches mit dem Gesenk A das Gesenkpaar Ab für den ersten Umformschritt bildet, eingelegt.

The sequence of a forging process can be based on the Figures 1 to 5 can be described as follows:

• Figure 1 : The upper die support 33 has moved to the right in the direction of the arrow x and the lower die support 63 has moved to the left in the direction of the arrow x ', so that the tool 1 is in position I. The die A arranged on the upper die carrier 33 and the die b arranged on the lower die carrier 63 thus form the pair of dies Ab. The press ram 103 is in its raised position P103-1 and the workpiece W is inserted in the form of a blank.
  Expiry between the Figure 1 and the Figure 2 : The press ram 103 is moved downwards in direction y ', the workpiece W is deformed in the process.
• Figure 2 : The first forming step has been carried out and the press ram 103 is in its lowered position P103-2. The dies B not involved in the first forming process, a protrude laterally over the active die Ab and are sprayed in by the spray heads 105, 106.
  Expiry between the Figure 2 and the Figure 3 : The press ram 103 is moved vertically upwards in direction y. The upper die support 33 is moved to the left in the direction of the arrow x 'and the lower die support 63 is moved to the right in the direction of the arrow x, so that the tool 1 is in position II.
• Figure 3 : The tool 1 is in position II and there is access to the workpiece 1, which has once been formed, so that it can be placed from the die b into the die a for the second forming step.
  Expiry between the Figure 3 and the Figure 4 : The press ram 103 is moved vertically downwards in direction y ', the workpiece that has already been formed once is formed a second time.
• Figure 4 : The second forming step has been carried out and the press ram 103 is in its lowered position P103-2. The dies A, b that are not involved in the second forming process protrude beyond the active die Ba and are sprayed in by the spray heads 105, 106.
  Expiry between the Figure 4 and the Figure 5 : The press ram 103 is moved vertically upwards in direction y.
• Figure 5 : The tool 1 is still in position II and there is now access to the workpiece W. which has been formed twice and thus completely formed. The workpiece W can thus be removed from the die a. Another workpiece is also used W 'is inserted into the die b which, together with the die A, forms the die pair Ab for the first forming step.

Expiration after Figure 5 : The upper die support 33 is moved to the right in the direction of the arrow x and the lower die support 63 is moved to the left in the direction of the arrow x ', so that the tool is again in the Figure 1 position I shown and the further workpiece W 'can be machined analogously to the first workpiece W by two forming steps.

List of reference symbols:

1

Tool

30th

Upper tool

31

upper sliding unit

32

upper base of 31

33

upper die beam from 31

34

upper drive from 31

60

Lower tool

61

lower sliding unit

62

lower base of 61

63

lower die beam from 61

64

lower drive from 61

101

Pressing device

102

Press frame

103

Press ram

104

Press table

105

first spray head

106

second spray head

A.

first die from 30

B.

second die of 30

a

first die of 60

b

second die of 60

From

first pair of dies

Ba

second pair of dies

H103

Vertical axis of 103

P103-1

raised position of 103

P103-2

down position of 103

P

Press

SP

Screw press

W.

workpiece

W '

another workpiece

x, x '

Direction (horizontal)

x34

Traversing axis from 34

x64

Traversing axis from 64

y, y '

Direction (vertical)

I.

first position of 1 or 30 and 60

II

second position of 1 or 30 and 60

I-1

open first position of 1 or 30 and 60

I-2

closed first position of 1 or 30 and 60

II-1

open second position of 1 or 30 and 60

II-2

open second position of 1 or 30 and 60

Claims (9)

Tool (1) comprising an upper tool (30) and a lower tool (60), - The tool (1) being designed as a multi-stage tool, - wherein the upper tool (30) comprises n dies (A, B), - wherein the lower tool (60) comprises n dies (a, b), characterized in that - that the dies (A, B) of the upper tool (30) and the dies (a, b) of the lower tool (60) can be positioned relative to one another in the horizontal direction in at least n positions (I, II), - wherein the n dies (A, B) of the upper tool (30) and the n dies (a, b) of the lower tool (60) are movable relative to one another in the horizontal direction, - that in a first position (I) for the formation of a first pair of dies (Ab) the first die (A) of the upper tool (30) and the n-th die (b) of the lower tool (60) are one above the other, - That in an n-th position (II) to form an n-th die pair (Ba) the n-th die (B) of the upper tool (30) and the first die (a) of the lower tool (60) are one above the other. Tool according to claim 1, characterized in that - That the upper tool (30) of the tool (1) comprises an upper displacement unit (31), the upper displacement unit (31) having an upper base (32) for connection to a press ram (103) of a press unit (10) and an upper die carrier (33), wherein the upper dies (A, B) are arranged on the upper die support (33) are and wherein the upper die support (33) is guided on the upper base (32) movably in the horizontal direction and - That the lower tool (60) of the tool (1) comprises a lower displacement unit (61), wherein the lower displacement unit (61) has a lower base (62) for connection to a press table (104) of the press unit (101) and a lower die carrier (63), wherein the lower dies (a, b) are arranged on the lower die support (63) and wherein the lower die support (63) is guided movably in the horizontal direction on the base (62). Tool according to claim 1 and 2, characterized in that the upper die support (33) is guided linearly displaceable in the horizontal direction on the upper base (32) and that the lower die support (63) is guided linearly displaceably in the horizontal direction on the lower base (62) is. Tool according to claim 2 or 3, characterized in that - That the upper displacement unit (31) comprises an upper drive (34), the upper die support (33) being movable relative to the upper base (32) by means of the upper drive (34) and - That the lower displacement unit (619 comprises a lower drive (64), the lower die support (63) being movable relative to the lower base (62) by means of the lower drive (64). Press (P) comprising a pressing device and a tool, - wherein the pressing device (101) comprises a press frame (102), a press ram (103) and a press table (104), - wherein a press stroke can be executed with the press ram (103) when the press unit (101) is actuated, - wherein the tool (1) comprises an upper tool (30) and a lower tool (60), - wherein the upper tool (30) is connected to the press ram (103), - wherein the lower tool (60) is connected to the press table (104), - The tool (1) being designed as a multi-stage tool, - wherein the upper tool (30) comprises n dies (A, B), - wherein the lower tool (60) comprises n dies (a, b), characterized in that - That the upper tool (30) of the tool (1) comprises an upper displacement unit (31), the upper displacement unit (31) having an upper base (32) for connection to the press ram (103) of the press unit (101) and an upper die carrier (33), wherein the upper dies (A, B) are arranged on the upper die support (33) and wherein the upper die support (33) is guided movably in the horizontal direction on the upper base (32) and - That the lower tool (60) of the tool (1) comprises a lower displacement unit (61), wherein the lower displacement unit (61) has a lower base (62) for connection to the press table (103) of the press unit (101) and a lower die carrier (63), wherein the lower dies (a, b) are arranged on the lower die support (63) and wherein the lower die support (63) is guided movably in the horizontal direction on the base (62). Press (P) according to claim 5, characterized in that the tool (1) of the press (P) is designed according to at least one of claims 1, 3 or 4. Press (P) according to claim 6, characterized in that - that the upper die carrier (33) can be moved along an upper travel axis (x34) of an upper drive 34 and the lower die carrier (63) can be moved along a lower travel axis (x64) of a lower drive (64), - that the traversing axes (x34, x64) run parallel and - That these travel axes (x34, x64) run at right angles to a vertical axis (H103) on which the press ram (103) moves during a press stroke. Press (P) according to at least one of the preceding claims 5 to 7, characterized in that the press (P) is designed as a screw press (SP). Press (P) according to at least one of the preceding claims 5 to 8, characterized in that - That the upper tool (30) comprises a first die (A) and a second die (B), - That the lower tool (60) comprises a first die (a) and a second die (b), - that in a first position (I) of the tool (1) the first die (A) of the upper tool (30) and the last die (b) of the lower tool (60) form a first pair of dies (Ab), - That in the first position (I) of the tool (1) with the first pair of dies (Ab) closed, the second die (B) of the upper tool (30) is accessible for die lubrication from below and the first die (a) of the lower tool (60 ) is accessible from above for die lubrication, - that in a second position (II) of the tool (1) the second die (B) of the upper tool (30) and the first die (a) of the lower tool (60) form a second pair of dies (Ba), - That in the second position (II) of the tool (1) with the second pair of dies (Ba) closed, the first die (A) of the upper tool (30) is accessible for die lubrication from below and the second die (b) of the lower tool (60 ) is accessible from above for die lubrication.

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