JP5570781B2 - Tools for forming workpieces, especially for sheet metal forming, and ejector devices - Google Patents

Description

  The present invention relates to a tool for forming a workpiece, in particular for forming a metal sheet, and an ejector device for the aforementioned tool, in particular for use in metal forming technology.

  An ejector device for a tool used for forming a workpiece, in particular for forming a thin metal plate, is known from JP 08-257657. FIG. 8 of this publication shows a press mold ejector device equipped with a forming device having a forming element that has a work piece support surface and is to be formed, and in particular a bonding element with the bottom surface of a sheet metal plate. A conventional example is shown. On the opposite side of the sheet metal to be formed is provided a punch with a workpiece contact surface designed for forming purposes, in particular for creating rim holes. The punch houses first and second ejector units, each comprising a restoring device, in particular a helical spring realized in the form of a compression spring. This first ejector unit comprises a compression spring with a spring constant in the form of a pin with a long, cylindrical shaft and with a long spring range and a low elastic force. Adjacent to the first ejector unit is another ejector unit having a short, pin-shaped shaft. This ejector unit is actuated by a restoring device having a spring constant with a shorter length compared to the first restoring device and with a short range of movement of the spring and a high elastic force. The two ejector units are arranged off the center with respect to the movement axis of the punch. With these arrangements of the ejector units, this second ejector unit is generally designed so that the workpiece can be removed from the punch after the workpiece has been formed, in particular after the workpiece has been deformed. Immediately following the mold opening action of the molding device against the workpiece, it will act on the workpiece. At the end of the initial movement phase of the punch and / or molding device, this second ejector unit is arranged in the movement end position. During the second or further movement phase after the first movement phase, only the first ejector unit remains activated. This first ejector unit is designed to ensure that the molded workpiece will be completely pulled away from the punch.

  This conventional example of this mold ejector device requires increased installation space due to the separate arrangement of the first and second ejector units, so that these ejector devices and / or their It has the disadvantage that the flexibility with which a tool receiving such an ejector device can be used is reduced. In addition, this ejector device has two ejector devices so that the molded workpiece can be forced into the unloading process, which can make it more difficult to pull the workpiece away from the extraction punch. It has the disadvantage that the unit is arranged off-center with respect to the movement axis of the punch forming device.

  In order to avoid this drawback, JP 08-257657 A discloses that along the axis of movement in order to allow a force to be applied centrally during the removal and / or extraction stroke of the workpiece from the punch. It is proposed to provide a single central ejector unit to be deployed. In order to apply the high elastic force that needs to be applied immediately after the molding process so as to release the work piece from the punch and thus ensure complete removal of the work piece from the punch. One single helical compression spring has been proposed which means a combination of two restoring devices of the ejector device. This centrally located restoring device comprises a first spring part equipped with a small pitch of the coil so that a short spring range of movement and a spring constant creating a high elastic force is achieved. The second spring part is equipped with a coil with a large pitch so that a long spring range (range) and a spring constant that creates a low elastic force is achieved.

  This layout has the disadvantage that a lot of space is required in the length direction for the installation of the ejector device due to the first and second restoration devices being placed one behind the other. . Furthermore, this arrangement has the disadvantage that both restoring devices are energized during the molding of the workpiece and the load is split between both springs. In particular, a spring part having a low spring constant, i.e. a spring having a low spring force and a long range of movement of the spring, is free of gaps. This is disadvantageous for process reliability.

JP 08-257657

  Thus, tools for forming workpieces, in particular for sheet metal forming, and for such tools, so that process reliability and flexibility can be increased for various fields of application. It is an object of the present invention to provide an ejector device.

According to the invention, this object is achieved by a tool according to the features of claim 1, i.e.
A tool for forming a workpiece, particularly a sheet metal forming tool, having a forming device and a punch, wherein the forming element is arranged on the forming device and equipped with a workpiece support, and the workpiece contact zone The molding element and the workpiece contact zone are arranged on the punch, respectively, associated with both surfaces of the workpiece to be molded, and the molding element and the punch of the molding device move relative to each other along a movement axis While the workpiece is possible, pressure is applied on the workpiece on the one hand by the workpiece support of the forming element and on the other hand by the workpiece contact zone of the punch. An ejector unit that is moldable in the course of its movement, wherein the tool is an ejector device and is at least one displaceably supported; and An ejector which is in contact with it and is equipped with at least one restoring device and which, following the shaping of the workpiece, applies a force to the ejector unit and lifts and lifts the workpiece against the punch・ In what has a device,
The first ejector unit and at least one other ejector unit are arranged such that the first ejector unit and the at least one other ejector unit are along the movement axis, one behind the other. Arranged in such a way that it can move in series and in which the first restoration device and at least one other restoration device are arranged coaxially with each other. A tool characterized by, accompanied by a restoration device
Also achieved by
Ejector device according to the features of claim 15, i.e.
15. Ejector device for a tool according to any one of the preceding claims for shaping a workpiece, particularly for fixing the ejector device on a punch of the tool. Tool, at least one first ejector unit, and at least one restoring device abutting against the first ejector unit, so that the first ejector unit is against the ejector seat of the punch In an ejector device that is slidably displaceable and lifts the workpiece away from the punch,
The first ejector unit and at least one other ejector unit are arranged so that the first ejector unit and the at least one other ejector unit are along the fastener, one behind the other. Arranged in series so as to be slidably displaceable and said first restoring device and at least one such that said first restoring device and said at least one other restoring device are arranged coaxially with each other An ejector device, characterized by one separate restoration device,
Achieved by:

  A tool according to the present invention equipped with an ejector device having at least one first and one other ejector unit, wherein each ejector unit comprises said first ejector unit and said at least one separate At least one restoring device with which the ejector units are arranged along the axis of movement, one behind the other, arranged to be movable in series and the restoring devices are arranged coaxially with each other The tool that has the advantage of providing a central arrangement of both ejector units in terms of the application of force, and at the same time a reduction in installation space is realized due to the coaxial arrangement of the restoring devices with respect to one another. It is possible to achieve higher process reliability due to the application of force in the center. By being able to reduce the building space, it is possible to achieve greater flexibility for various field applications. Moreover, this arrangement has the advantage that the first restoring device that abuts the first ejector unit and produces a long travel distance and low elastic force does not eliminate the gap when it is in the workpiece forming position. Have. Therefore, process reliability can be improved. In addition, this arrangement results from the arrangement of two separate restoring devices coaxially with each other, so that the respective spring constants and / or restoring forces of the restoring devices are adjusted individually and independently of each other according to a given application. Has the advantage that

  According to a preferred configuration of the invention, the first and at least one further restoring device are designed to be arranged coaxially along the movement axis of the punch. This makes it possible to use a first and another restoring device to achieve a central force applied to the ejector seat in the punch to remove the molded workpiece. This makes it possible to realize a particularly compact restoration device arrangement and punch configuration. Alternatively and additionally, additional restoring devices arranged coaxially with each other are provided outside the axis of movement and are preferably designed to be related to each other so that a uniform withdrawal is possible without tilting It is possible.

  According to another preferred configuration of the invention, the first restoring device is designed with a spring constant having a long spring range and a low elastic force, the at least one further restoring device being a spring. It is designed to have a spring constant having a short movable range and a high elastic force. Due to the separate configuration of this second or another restoring device, this restoring device can be realized with an increased outer circumference so that an increase in force can be achieved. This simplifies manufacturing. At the same time, this causes the two restoring devices to be nested within one another, with a portion of the spring of the first restoring device corresponding to a portion of the spring of the second or another restoring device. This allows for a compact arrangement, which may alternatively be advantageous for individual applications.

  According to another preferred configuration of the invention, on the one hand, the first restoring device and at least one other restoring device are designed to be supported by the ejector seat of the punch, on the other hand, at least one other restoring device. The device is designed to abut against the inner surface of at least one other ejector unit, the first restoring device extending through the at least one other ejector unit and abutting the first ejector unit Designed as such. This allows the first ejector unit to operate independently of this at least one other ejector unit after at least one other ejector unit has reached its end of movement position. At the same time, it is possible to achieve a reduction in building space by nesting the first ejector unit and at least one other ejector unit, as well as the first restoration device and at least one other restoration device. .

  In a preferred configuration of the first restoring device, the restoring device is designed to be formed by at least one coil spring. Such coil springs, or helical compression springs, can be manufactured at low cost and allow simple and individual adaptation of the spring constant and workpiece shape for any particular application. Alternatively, other types of spring members can be provided either individually or in combination.

  The at least one further restoring device is preferably realized in the form of a predetermined number of disk springs or Eladur spring members. When several disc springs are used, they are arranged and stacked partially in the opposite direction or in the same direction to provide the necessary elastic force for a given range of movement (range) of the spring be able to. As a further alternative, a helical compression spring or the like can be used.

  According to a preferred configuration of the invention, the first ejector unit and the at least one other ejector unit that are in contact with each other are arranged in a first stage during the first movement phase of the ejector device extending from the molding position to the intermediate ejector position. Designed to be transported together by one restoration device and at least one other restoration device. Thanks to the different spring constants of the restoring device, the operation of at least one other restoring device is dominant in this first movement phase, ensuring a quick release of the workpiece formed at the molding position in the punch. It is possible to

  According to another preferred configuration of the invention, the at least one further ejector unit is positioned in the stop position after the first movement stage of the ejector device extending from the molding position to the intermediate ejector position is completed. In the course of a further movement phase of the ejector device, the first ejector unit is transported to the original position by the first restoration device in a manner independent of at least one other restoration device. It is designed so that it can be returned. Therefore, complete removal of the molded workpiece from the punch can be ensured. Thanks to the independent operation of the first restoration device and the at least one other restoration device, different ejector stages can be easily adapted to the respective required forces while still maintaining a compact construction space.

  According to a preferred embodiment of the invention, when in the initial or starting position, the first ejector unit is arranged flush with the pressing surface on the punch or at least slightly raised relative to the pressing surface. Established. This allows complete removal of the molded workpiece and ensures that the subsequent transport of the workpiece in the plane of the workpiece holding device can be carried out smoothly without obstacles.

  According to a preferred configuration of the invention, the at least one further ejector unit is equipped with a central through-hole arranged in the movement axis and comprises an outer guiding part for at least one further restoring device. Designed. The at least one restoring device can thus be received in a position-fixed manner in the punch seat and the restoring force can be applied centrally on at least one other ejector unit.

  In another preferred configuration of the invention, the at least one further ejector unit is designed to be movable in the punch seat along the movement axis by means of at least one coaxially arranged guide member. As an example, the guide member can be provided in the form of a pin-shaped member disposed outside the moving shaft, which is movable along a hole formed in the punch housing. In particular, these guide members are provided on the one hand in the form of screws or pins so that the movement distance with respect to the ejector position can be adjusted and on the other hand at the same time to fulfill the guiding function.

  According to another preferred configuration of the invention, this first ejector unit is designed to be held in place by at least one fastener arranged on the movement axis. The fastener abuts the punch, along the axis of movement while the first ejector unit and the first restoring device are fixed relative to the punch and perform the first movement stage and at least one further movement stage. Allows to become movable. This allows the first ejector unit to be mounted on the punch in a manner unrelated to at least one other ejector unit.

  According to a preferred configuration of the invention, the first ejector unit and the at least one other ejector unit of the ejector device are each associated with each other and, for example, from the intermediate ejector position to the molding position and from the molding position to the middle. A centering portion is provided which serves to place the first ejector unit and at least one other ejector unit in a manner aligned with each other during the phase of movement of the ejector device to the ejector position. Thus, it can be ensured that no radial displacement movement between the two ejector units will occur after the first ejector unit contacts at least one other ejector unit. This makes it possible to control the axial movement of the movement and to apply a force in the middle on the workpiece to be molded.

  According to another preferred configuration of the invention, the first ejector unit is movably arranged in the pot-shaped punch seat and is designed to extend to the radial workpiece contact zone of the punch seat. . As a result, particularly when a cylindrical rim hole is formed in the metal thin plate part, it is possible to enable reliable removal.

  According to the invention, the object is that the first ejector unit and the at least one other ejector unit are accompanied by at least a first restoration device and at least one other restoration device, the restoration device comprising: Their corresponding ejector units and at least one other ejector unit can be moved in series along the fasteners behind one another and the restoring devices are arranged coaxially with each other Further achieved by an ejector device associated with each ejector unit. This type of ejector device allows for easy mounting in the punch using fasteners that hold the ejector unit and the restoring device. In addition, flexible use with various punch seats and easy adaptation to the punch seats are possible. Thanks to the separate arrangement of the restoring devices on the one hand and their coaxial arrangement on the other hand, it is possible to determine and adjust the respective movement distances and the respective movement forces independently of one another. The ejector unit to be placed in the punch seat can be formed according to the workpiece to be manufactured.

  The invention, as well as other advantageous embodiments and their development, will be described and explained below with reference to the examples shown in the drawings. Features derived from this description and the drawings can be applied in accordance with the present invention either individually or by taking a plurality of features in any combination.

1 is a schematic cross-sectional view of a tool according to the present invention used for sheet metal forming. FIG. 2 is a schematic top view of the punch of the tool according to FIG. 1. FIG. 3 is a schematic cross-sectional view of the punch along line AA in FIG. 2. FIG. 2 is a schematic cross-sectional view of the workpiece of FIG. 1 in a molding position. FIG. 2 is a schematic cross-sectional view of the workpiece of FIG. 1 in a molding position. It is a schematic sectional drawing of the to-be-processed product of FIG. 1 in an intermediate ejector position. It is a schematic sectional drawing of the to-be-processed product of FIG. 1 in an intermediate ejector position.

  FIG. 1 shows a schematic cross-sectional view of a tool 11 for forming a workpiece 12, in particular a thin metal plate. This tool 11 comprises a forming device 14 as part of the lower tool and a punch 16 as part of the upper tool. This tool 11 is used in a molding machine for pressing and / or molding purposes. In such a molding machine, the workpiece 12 is preferably positioned and displaced with respect to the tool 11 in the plane of the workpiece using guides based on coordinates. The tool 11 is preferably used for metal sheet forming, for example, a tool called a mold.

  This molding device 14 is used when the molding process is carried out, for example when the rim 21 of the opening in the workpiece 12 is to be deformed by the punch 16 to create a rim hole. A molding element 18 having a workpiece support 19 that abuts the bottom surface is provided. This forming element 18 is surrounded by a disk 22 which is spring mounted. The disk 22 is fixed to the main body 23 by a spring mounting method, and is movable along the moving shaft 24. The molding device 14 is realized as a so-called active tool plate.

  The punch 16 is disposed to face the molding device 14. It comprises a punch body 28 on its top end provided with a ram 29 for positioning and fixing the punch 16 in the upper tool seat of the molding machine. The punch body 28 includes an ejector seat 31 realized in the form of a recess. On the outer periphery of the ejector seat 31, there is provided a pressing surface 32 that is in contact with the workpiece 12 to be molded during the molding process. Adjacent to the pressing surface 32, a workpiece contact surface 33 is provided in the form of a lateral surface of the pot-shaped ejector seat 31, for example to create a rim hole. This workpiece contact surface 33 can alternatively be provided with other geometric shapes to allow for proper adaptation to the molding requirements, in particular the required deformation.

  Located in the ejector seat 31 is an ejector device 34 comprising a first ejector unit 36 having an associated restoring device 37. This first ejector unit 36 and restoring device 37 are positioned relative to the ejector seat 31 by means of fasteners 38, in particular studs. This fastener 38 is engaged with a blind hole 39 formed in the ram 29. This first ejector unit 36 is, for example, in the form of a disk or a flat plate, and has a flat ejector surface 42 that extends to the circumferential workpiece contact zone 33. In the initial position 44 or starting position of the punch 16, the ejector surface 42 of the first ejector unit 36 is arranged to project flush with or slightly from the pressing surface 32. The ejector unit 36 has a through hole 46 extending along its central axis and in which a fastener 38 is disposed. This central axis simultaneously corresponds to the movement axis 24 of the punch 16. The through hole 46 is a guide portion 47 that abuts the shaft 48 of the fastener 38 for movably guiding the ejector unit 36 relative to the moving shaft 24 when the ejector unit is displaced along the shaft 48. Is provided. On the front end of the through-hole 46 is provided an abutment surface 49 that faces towards the ejector seat 31 and can abut a restoring device 37 that is preferably realized in the form of a helical compression spring. On the opposite side, another abutment surface 50 surrounding the blind hole 39 is provided. A first restoration device 37 is mounted between these surfaces.

  The ejector device 34 comprises at least one further ejector unit 52 having at least one other restoring device 53 which is likewise movably arranged in the punch 16 along the movement axis 24. For this purpose, the second ejector unit 52, which is also preferably disc-shaped, is designed with a central passage 55 through which the fastener 38 and the first restoring device 36 extend. This second ejector unit 52 comprises a counter surface 56, preferably in the form of an annular disc, complementary to the abutment surface 57 of the first ejector unit 36. This abutment surface 57 of the first ejector unit 36 is arranged parallel to the ejector surface 42, so that the opposing surface 56 is preferably parallel to the abutment surface 57 as well. Opposing the opposing surface 56 of the second ejector unit 52 is provided a contact surface 59 against which at least one further restoring device 53 abuts.

  In addition, a pot-shaped part is disposed in the ejector seat 31, having a shoulder surface 61 that is positioned opposite the abutment surface 59 and serves to receive the second restoring device 53. This second restoring device 53 is realized, for example, in the form of a disc spring assembly. Alternatively, a helical compression spring or an Herradur spring member can be provided.

  This second restoration device 53 is arranged coaxially with respect to the first restoration device 37 which is made to pass through at least the second ejector unit 52. In particular, this passage 55 has a circumferential rim 63 which is designed so that its outer periphery serves as a guiding part for the second restoring device 53.

  FIG. 1 shows both the molding device 14 and the punch 16 in their original or starting positions 44, 64, respectively.

  FIG. 2 shows a top view of the punch 16 according to FIG. FIG. 3 shows a schematic cross-sectional view along the line AA of FIG. This sectional view is shown offset by 45 ° from the sectional view according to FIG. 1, with the top view of FIG. 2 serving as a reference.

  The cross-sectional view shown in FIG. 3 shows the fixation of the second ejector unit 52 in the starting position 44. The punch body 28 is equipped with a free fixing part of the guide member 66 which engages with the hole 67 of the second ejector unit 52, in particular a threaded part, for example provided with a guide member 66 realized in the form of a screw. . For example, by arranging two, three, or more guide members 66 that are evenly arranged around the circumference, the second ejector unit 52 is displaced centrally along the movement axis 24. Sometimes it is possible to reliably receive the second ejector unit 52 against the punch 16 so as to guide it movably. At the same time, the movement end position of the second ejector unit 52 can be adjusted.

  The first ejector unit 36 and the second ejector unit 52 are arranged in series, one behind the other, and the first restoring device 37 and the second restoring device 53 are coaxial with each other, in particular This arrangement of the ejector device 34 disposed along the movement axis 24 makes it possible to obtain a compact construction space and to ensure good process reliability. At the same time, such an ejector device 34 allows great flexibility in terms of its adaptation and configuration feasibility. The first restoring device 37 can be configured independently of the spring rate of the second restoring device 53 as far as its spring rate is concerned. At the same time, restoration devices 37 and 53 can differ from each other in their configuration. The first restoring device 37 is preferably realized in the form of a helical compression spring with a long spring range combined with a low elasticity. On the other hand, the second or at least one further restoring device 53 has a spring rate comprising a spring with a short range, but with a high elasticity.

  Alternatively, such as when a larger punch 16 is used, such an ejector device 34 is designed to be located exclusively off-center with respect to the movement axis 24 and evenly around a common circumference. Can be designed to be distributed. Alternatively, one ejector device can be designed to be centrally located, and another multiple ejector devices are evenly distributed around a common circumference can do.

FIG. 4a shows a schematic cross-sectional view of the forming position 71 of the tool 11 similar to the cross-sectional view according to FIG. FIG. 4b shows a schematic cross-sectional view of the forming position 71, similar to the cross-sectional view according to FIG. In this molding position 71, the molding element 18 of the molding device 14 is fully engaged with the ejector seat 31 of the punch 16. After reaching this forming position 71, the forming process of the workpiece 12 has been accomplished. For example, a rim hole 73 is created. At the molding position 71, the second ejector unit 52 is transferred to a stop position where it comes into contact with the stop portion 74 in the ejector seat 31. If disc springs are used, in this position it is preferable to keep the restoring device 53 free from gaps so that the disc springs can be prevented from losing their spring force. The first ejector unit 36 is arranged such that the force generated by the shaping element 18 and acting on the first ejector unit 36 is immediately transmitted to the opposing surface 56 via the abutment surface 57. It is in direct contact with the ejector unit 52. In order to ensure a controlled movement of the movement of the first and second ejector units 36, 52 along the movement axis 24, in particular along the fastener 38, they are engaged and aligned with each other. in so that, centering table surface 76 consisting of a tapered surface adjacent the through hole 46 and the passage 55, it is provided on the first and second ejector units 36, 52 respectively.

  In this molding position 71, for example, the molding device 14 is positioned by the pressing surface 32 so that the disc 22 is moved completely towards the main body 23 so that they abut one another. Preferably, the fastener 38 can jump into the empty space 78 when the forming element 18 has an empty space 78 so that the forming position 71 is reached.

  After reaching the forming position 71, the movement of the forming device 14 and the punch 16 in the opposite direction is started so that they move away from each other. At the same time, the process of taking out the molded workpiece 12 starts. FIG. 5 a shows a schematic cross-sectional view similar to the cross-sectional view according to FIG. 1, shown at the first intermediate ejector position 81. FIG. 5b shows a first intermediate ejector position 81 that is similar to the cross-sectional view of FIG.

  The transfer from the molding position 71 to the intermediate ejector position 81 is achieved by the dominant and decisive restoring forces originating from the first and second restoring devices 37, 53, and the first and second restoring devices 37, 53. The transfer of the first and second ejector units 36, 52 to the ejector position 81 achieved by action is caused by the second restoring device 53. At the same time, the spring loaded disc 22 rises away from the main body 23 in the molding device 14. In addition, the first ejector unit 31 raises the periphery of the rim hole 73 from the pressing surface 32. At this intermediate ejector position 81, the movement phase of the second or another ejector unit 52 ends. The guide member 66 has reached the stop position, and the second ejector unit 52 takes its movement end position.

  The removal of the workpiece 12 is started at this time, and the first ejector unit 36 is operated exclusively by the first restoring device 37 to transfer the first restoring device to the initial position 44 as shown in FIG. Completed by starting another transfer phase in the process of being made.

11 Tool; 12 Workpiece; 14 Molding device; 16 Punch;
18 molding elements; 19 workpiece support; 21 rim; 22 disc;
23 Main body; 28 Punch body; 24 Movement axis; 31 Ejector seat;
32 pressure surface; 33 workpiece contact zone; 33 workpiece contact surface zone;
34 ejector devices; 36 ejector units;
37 Restoration device; 38 Fastener; 42 Ejector surface;
44 Initial position; 46 Through hole; 47 Guide portion; 48 Shaft;
52 another ejector unit; 53 another restoration device; 55 central passage;
56 facing surface; 57 abutting surface; 59 abutting surface; 63 circumferential rim;
64 starting position; 66 guide member; 71 molding position; 73 rim hole;
74 Stop; 76 Centering surface; 78 Empty space;
81 Intermediate ejector position.

Claims (14)

Shaping device (14) and a punch (16), a tool for metallic sheet metal of the workpiece (12),
A molding element (18) is arranged on the molding device (14) and equipped with a workpiece support (19), a workpiece contact zone (33) is arranged on the punch (16) and the molding An element (18) and the workpiece contact zone (33) are associated with both surfaces of the workpiece (12) to be molded, respectively, and the molding element (18) and the punch (16) of the molding device (14). ) Are movable with respect to each other along a movement axis (24) and the workpiece (12) is subjected to pressure on the one hand by the workpiece support (19) of the forming element (18) and on the other hand While being applied on the work piece (12) by the work piece contact zone (33) of a punch (16), the tool can be formed during its movement, and the tool comprises an ejector device (34). Because At least one displaceably supported ejector unit (36) and abutting it, equipped with at least one restoring device (37) and following the shaping of the workpiece (12), Having an ejector device (34) for applying a force to an ejector unit (36) and lifting the workpiece (12) away from the punch (16);
The first ejector unit (36) and at least one other ejector unit (52) are moved while the first ejector unit (36) and the at least one other ejector unit (52) are moved. Axis (24) is arranged such that one is movable in series behind one another and said first restoration device (37) and at least one other restoration device (53) are mutually connected The first restoration device (37) and the at least one other restoration device (53) arranged coaxially, the first restoration device and the at least one other restoration device (37, 53). ) Is supported in the ejector seat (31) of the punch (16) and on the other hand the at least one further restoration A vice (53) abuts the contact surface (59) of the at least one other ejector unit (52), and the first restoring device (37) is the at least one other ejector unit (52). A tool extending through the abutment and abutting against the first ejector unit (36).   The first restoration device and the at least one other restoration device (37, 53) are arranged coaxially with each other along the movement axis (24) of the punch (16). Item 1. The tool according to item 1.   The first restoring device (37) is realized in the form of a spring member having a spring constant with a long movable range and low elastic force of the spring, and the at least one further restoring device (53) is a short movable of the spring. 3. Tool according to claim 1 or 2, characterized in that it comprises a spring member having a spring constant with a range and a high elastic force. It said first recovery device (37), characterized in that it is realized in the form of a screw-handed compression spring, tool according to claim 1. Wherein said at least one different restore device (53) is formed from a predetermined number of disk springs, or characterized in that it is realized in the form of Eraduru spring member, tool according to any one of claims 1-4 . The first ejector unit and the at least one other ejector unit that are in contact with each other in a first stage of movement of the ejector device (34) extending from a molding position (71) to an intermediate ejector position (81) 36, 52) is equal to or capable of being transported together by the first restoring device and the at least one further restoring device (37,53), the tool according to any one of claims 1-5. After the first movement stage of the ejector device (34) extending from the molding position (71) to the intermediate ejector position (81) is completed, the at least one other ejector unit (52) is finished moving In the course of a further movement phase of the ejector device (34), the first ejector unit (36) is positioned in position and is independent of the at least one other restoring device (53), 7. Tool according to claim 6 , characterized in that it can be transported back to its original position (44) by the first restoring device (37). When in the initial position (44), the first ejector unit (36) surrounds the ejector seat (31) of the punch (16) and faces the pressing surface (32) on the punch (16). 8. Tool according to claim 7 , characterized in that it is arranged in one or at least slightly elevated with respect to the pressing surface. The at least one further ejector unit (52) has a central passage (55) with a circumferential rim (63) for receiving the at least one further restoring device (53). A tool according to any one of claims 1 to 8 . The at least one further ejector unit (52) is movable along the movement axis (24) of the punch (16) by at least one coaxially arranged guide member (47). The tool according to any one of claims 1 to 9 . The first ejector unit (36) is maintained against the ejector seat (31) of the punch (16) by at least one centrally located fastener (38) and the fastener (38 ) characterized in that it is arranged so may be slidingly displaced with respect to the tool according to any one of claims 1-10. The first ejector unit and the at least one other ejector unit (36, 52) are each provided with a centering surface (76) comprising tapered surfaces that engage with each other. A tool according to any of claims 1 to 11 . A circumferential work piece contact zone (36) in which the first ejector unit (36) is disposed within the ejector seat (31) and disposed at least in the radial direction of the ejector seat (31). 33), characterized in that extending to the tool according to any one of claims 1 to 12. A ejector device for the workpiece (12) from said claims 1 for molding 13 according to any one tool (11) (34), the punch (16) of the tool (11) on At least one fastener (38) for securing the ejector device (34) to at least one first ejector unit (36), and at least abutting the first ejector unit (36) Having one restoring device (37) , the first ejector unit (36) being slidably displaceable with respect to the ejector seat (31) of the punch (16) and the punch (16) In an ejector device that lifts and releases the workpiece (12) relative to
The first ejector unit (36) and at least one other ejector unit (52) are connected to the first ejector unit (36) and the at least one other ejector unit (52). Arranged to be slidably displaceable along the tool (38), the first restoring device (37) and the at least one other restoring device (53) being coaxial with each other and the first Ejector device, characterized in that the restoration device (37) and at least one other restoration device (53) are both arranged in one ejector seat (31) .

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