EP3448594A1

EP3448594A1 - Transfer press having a c-shaped ram

Info

Publication number: EP3448594A1
Application number: EP17725155.0A
Authority: EP
Inventors: Andreas Steiner
Original assignee: Fritz Werner Industrie-Ausruestungen GmbH
Current assignee: Fritz Werner Industrie-Ausruestungen GmbH
Priority date: 2016-04-28
Filing date: 2017-04-28
Publication date: 2019-03-06
Anticipated expiration: 2037-04-28
Also published as: US11712734B2; JP2019518605A; PL3448594T3; US20190118242A1; WO2017186234A1; KR102372407B1; HUE052462T2; ES2832474T3; ZA201806395B; KR20190002524A; EP3448594B1

Abstract

The invention relates to a transfer press for successively forming and demolding workpieces using upper and lower tools (1, 3) in dies (31), wherein the upper tools (1) are fastened to a ram head (5) whereas the lower tools (3) are mounted on a ram base (7). The ram head (5) and the ram base (7) are rigidly connected to each other and form a ram.

Description

TRANSFER PRESS WITH A C BUMPER

DESCRIPTION

The invention preferably relates to a transfer press for the successive reshaping and removal of workpieces by means of upper and lower tools in dies, wherein the upper tools are attached to a ram main, while the

Sub-tools installed on a ram foot installed. The plunger head and the plunger foot are rigidly connected together and form a plunger. Background and state of the art

The invention relates to the field of transfer presses for forming workpieces, in particular metal sheets. Forming belongs to the main group of manufacturing processes according to DIN 8580 and describes the controlled plastic deformation of a solid. Mass and substance cohesion are preserved. The mechanical processing machines for effecting the forming operation are generally referred to as pressing. Depending on the degree of deformation, which quantitatively describes the change in shape, the forming process may need to be carried out in several stages in order to realize the production of a workpiece. In this case, transfer presses are used whose special feature is to automatically transport the workpiece through the individual forming stages using a transfer system.

As part of the sheet metal processing thermoforming methods are applied, which include a sub-grouping of the aforementioned forming. In principle, the ronden- or cup-shaped workpiece is threaded by the so-called drawing punch and pulled through a die. This results in a change in the parameters diameter, wall thickness and height depending on the selected tool geometry.

In the case of transfer presses, the drawing dies are usually fastened to an upper ram, the so-called press ram, for forming. This is stored within the press frame and has, for example, a mechanical or hydraulic drive to provide the force required for forming during the required travel. The die is located in the tool block on the press table, to which the press ram performs an oscillating relative movement. In order to ensure that the workpiece returns to the transfer system after the forming process and does not get stuck in the die, mechanical support by demoulding tools is often required. For this purpose, the transfer press comprises lower tools or lower punches, which are driven by a lower ram and push the workpiece out of the die.

The prior art discloses a number of such transfer presses.

For example, US 4166372 A and US 4655071 A describe transfer presses for processing cup-shaped metal workpieces, wherein a plurality of upper punches are installed on a ram main, while the lower tools are driven individually via a camshaft. In US 4562719 A, a transfer press has upper tools with different diameters along their height

Incorporation of steps into the metallic workpiece. The upper tools are driven together by a plunger main, while the lower tools can be lifted individually or together. Notwithstanding this, US Pat. No. 2,539,807 A proposes a transfer press in which the upper tools are held together by a transfer press

Plunger main, while the lower tools are controlled together by a plunger foot. To be able to set different drawing speeds, however, DE 2743642 A1 proposes a transfer press in which both the punches as upper tools and the lower tools as ejectors are each driven separately. The disadvantage, however, is the expensive

Drive control.

In the known state of the art, therefore, the successive working steps of reshaping and demoulding are realized by separate mechanical assemblies.

Typically, the transfer presses include a press ram for receiving the draw punches as an assembly. Independently of this, a lower plunger or a plurality of individually controllable lower plungers with corresponding punches are provided for removal from the mold.

The kinematics of the respective assemblies for forming as well as demoulding must be ensured by an associated drive. In the prior art, it is preferred that a central drive be distributed to both modules. However, the geometric distance between the press ram and the lower rams for demolding has a complex mechanical coupling result. For this purpose, transmissions, in particular gear pairs, Shafts, in particular cardan joints and shafts, chains, belts and couplings used.

Due to developments in drive technology, electronically synchronized individual drives for the respective assemblies are being used more and more often instead of exclusively mechanical couplings.

Both the drive by mechanical couplings and by separate electromechanical individual drives are characterized by a considerable effort.

Another disadvantage is the size of the plunger in the known transfer presses. In order to ensure a high guiding accuracy of the press ram as well as of the or the plunger for demolding, the respective plunger height should be close to the plunger width or even larger. In known transfer presses, the dimensioning of the press racks is correspondingly large.

OBJECT OF THE INVENTION An object of the invention was to provide a transfer press which overcomes the disadvantages of the prior art. In particular, it was an object of the invention to develop a transfer press, which is characterized by compact design, simplified drive and high manufacturing precision.

Summary of the Invention According to the invention, the object is solved by the independent claims. The dependent claims represent preferred embodiments of

transfer press according to the invention and their use.

In a preferred embodiment, the invention relates to a transfer press for carrying out at least two forming and demolding steps of a workpiece, comprising a press table with at least two matrices for receiving the workpiece, a transfer system for transfer of the workpiece between the matrices and at least two upper tools and at least two

Sub-tools, which can perform a relative movement to the press table, so that in a first forming step, the workpiece can be converted from a first upper tool in a first die, in a first

Entformschritt the workpiece can be removed from the mold by a first lower tool, in a transfer step, the workpiece by the transfer system of the first die can be conveyed to the second die, in a second forming step the workpiece can be reshaped by a second upper tool in a second die and in a second removal step the workpiece can be removed from the second die by a second lower tool, the upper tools installed on a ram main, the

Sub-tools are installed on a plunger foot and the plunger head and the plunger base are rigidly connected together and form a plunger.

For the purposes of the invention, a "workpiece" is understood to mean the component to be processed, which undergoes several forming processes in the transfer press. Preferred workpieces are metal sheets, in particular sheet metal cups, which are drawn successively.

The "top tools" are the tools of the transfer press, which are used to reshape the workpiece, which are preferably die punches, which, in conjunction with corresponding dies, allow the workpieces to be deep-drawn present formed by clearances forming tools as a counter-mold to the upper tools. For the preferred drawing of sheet metal cups, the matrices are, for example, circular, wherein the diameter of the matrices is greater by at least twice the plate thickness of the resulting drawing stages than the diameter of the upper tools or drawing dies.

The lower tools are especially adapted to the size of the dies and ensure that any workpieces that may be present in the dies are pushed out by inserting the lower tools.

It is preferred that in the transfer press according to the invention, the forming takes place by a relative movement of the upper tools from top to bottom. For the purposes of the invention, top and bottom are preferably defined according to gravity. After forming a retraction movement of the upper tools takes place from bottom to top, preferably at the same time demoulding the lower tools by an upward movement of the workpieces from the matrices. However, the person skilled in the art recognizes that a reverse construction of the transfer press is also suitable for implementing the teaching according to the invention, wherein the forming from bottom to top he follows. In that case, the directions of the upper and lower tools would be reversed for the description of the invention.

According to the invention, the workpiece experiences at least two forming and demolding processes when passing through the transfer press. For this purpose, the transfer press comprises a transfer system. With the aid of the transfer system, the workpiece is conveyed on after a first forming and removal step in a first die, so that a second forming step can take place in a second die. The person skilled in the art is familiar with suitable transfer systems.

For example, by demolding the workpiece can be transferred into a swinging body, which oscillates between two positions. After the first demoulding step from the first die, the workpiece is transferred to the swinging body, which aligns the workpiece with the second die by a pre-swing (transfer step). The alignment thus preferably means a positioning of the workpieces, for example, above the respective die, so that a forming can take place in the respective die.

For optimal utilization of the transfer press is known to be carried out preferably a continuous processing, wherein the workpieces pass through the transfer press continuously. While the second forming step of a first workpiece takes place in the second die, a second following workpiece is correspondingly formed in the first die.

During the preferred operation of the transfer press according to the invention, the forming steps take place simultaneously for several workpieces according to their positioning in the dies. The successive forming of a workpiece, which passes through the transfer press, is preferably achieved by a different dimensioning of the upper tools. For example, longer or shorter drawing punches can be used. During operation of the transfer press the various upper tools are always performed simultaneously in a relative movement to the press table. The same applies equally to the lower tools, which simultaneously push out or demould several workpieces from the respective dies.

For this purpose, the transfer press according to the invention comprises a plunger head, on which the upper tools are mounted, and a tappet foot for the lower tools. According to the invention, the plunger head and the plunger foot are rigidly connected to one another. This is in the transfer press according to the invention only a displaceable component for controlling the kinematics of the upper and lower tools. For the purposes of the invention, the rigid composite of plunger head and plunger base is also referred to as a plunger assembly or plunger.

This construction has a number of advantages over known solutions. In the prior art, the upper tools are usually operated by a main ram in the form of a monobloc. This must be designed for a high power transmission, since the required working capacity for forming amounts significantly larger than the demoulding work. In addition, the prior art transfer presses separately comprise one or more plungers for operating the demoulding tools. To drive the main ram and the or the ram for demolding is, as explained above, either a complex mechanical coupling of a central drive, or the use of multiple electronically synchronized individual drives necessary.

By using the plunger according to the invention advantageously only a simple drive is necessary. This controls both the lifting and lowering of Oberais also sub-tools. According to the invention, it has been recognized that the kinematics of the transfer press can be significantly simplified by a mechanical, rigid connection of a plunger head for the upper tools and a plunger foot for the lower tools. The invention thus allows a reduction of the effort and costs for the production, operation and maintenance of the transfer press.

In addition, the ram according to the invention allows a surprisingly compact construction of the transfer press. In order to ensure a secure guidance of the upper and lower tools, the plungers are preferably dimensioned in a guide ratio in the prior art, in which the plunger height is almost as large or larger than the plunger width. For the purposes of the invention, the term height or vertical extent, e.g. the plunger or the transfer press, preferably the dimension in which the upper and lower tools are moved up and down relative to the press table. The width or lateral extent, e.g. the ram or the transfer press, however, preferably indicates the direction along which the at least two upper or lower tools are lined up side by side and the workpieces successively through the intended forming steps in the transfer press.

For many applications, for example for drawing sheet metal cups for cartridge cases, it is preferred to successively more than two aligned upper and lower tools Use forming and demolding steps. As a result, a minimum width of the plunger for the upper and lower tools is set in the prior art. Each individual plunger in the prior art has at least one height which corresponds to this width. A transfer press of the prior art with such separate ram assemblies is therefore characterized by a large overall height.

In contrast, allows the rigid connection of the plunger head with the plunger foot a clearer compact design. The relevant ram height for a stable guidance in the case is equal to the total height of the ram main up to the ram foot. As a result, the plunger according to the invention, even with a dimensioning of the plunger according to the invention with a height which corresponds to the width, still ensures precise guidance of the upper and lower tools.

For the purposes of the invention, the rigid composite of the plunger head with the plunger base is preferably understood to mean any mechanical connection which does not allow any relative movement of the two components relative to one another. The plunger according to the invention may be a monoblock or be composed of several components for this purpose.

In a preferred embodiment, the plunger head and the plunger base are rigidly connected to each other by means of two side parts. The side parts are preferably vertical connections between the plunger head and the plunger base, which are fixed to the respective outer, lateral ends of the plunger head and foot. By such a rigid connection can be with minimal

Cost of materials to construct a particularly stable inventive ram. The side parts can hereby be shaped differently and fastened at different positions of the plunger head and foot. For example, the plungers could be connected by two side parts in the form of tie rods, which extend on both sides through the press table. Such a rigid connection is characterized by a particularly favorable power transmission and mechanical coupling of the plunger head and foot.

On the other hand, openings in the press table are required in this embodiment, whereby its capacity to absorb the forces acting

is weakened. Especially with power-consuming forming presses, such as. in the case of deep drawing of sheet metal cups for cartridge cases, are homogeneous

Press tables for receiving the work done by the upper tools advantageous. In a preferred embodiment of the invention, the plunger head, the plunger base and the press table in a plane, wherein the side parts for rigid connection of the plunger head with the plunger base have a C-shape, so that the side parts from the plunger main to the plunger foot before or behind the press table passes become. For the purposes of the invention, the configuration of the side parts in a C-shape preferably means that they do not directly connect the plunger main and the plunger foot vertically, but in the side profile of the transfer press diffraction, ie a C-shape have. The indication of direction in front of and behind the press table refers to the depth of the transfer press, ie the extent which is orthogonal to the side and height. In this embodiment, an excellent mechanical power transmission can be implemented by the ram main to the ram without any breakthroughs in the press table would be necessary. Surprisingly, the embodiment is thus characterized with a low material cost and weight by a compact and particularly strong-stable construction of the plunger according to the invention.

In a preferred transfer press, the ratio of the width of the plunger to the height of the plunger 1 to at least 0.5, preferably 1 to at least 1. The height of the plunger is preferably from the upper end of the plunger head to the lower end of the plunger base, whereas the width corresponds to the distance between the outermost lateral end of the plunger. The preferred size ratios allow a particularly stable leadership. Accordingly, bearings for guiding the plunger can be installed laterally on the plunger main and foot, respectively, which have a distance of almost the width of the plunger, or even larger. The greater the vertical distance of the bearings from one another, the more effectively a tilting or the occurrence of transverse forces can be avoided. On the other hand, the ram height contributes significantly to the overall height of the transfer press. The aforementioned parameters represent optimized values with regard to a space-saving construction with high guiding stability.

In a preferred embodiment of the invention, the transfer press comprises a central drive motor as a starting point of a drive train, which controls the movement of the plunger via at least one connecting rod. Advantageously, the upper and lower tools of the transfer press can be replaced by a single

Move drive train. Preferably, the at least one connecting rod is used

Power transmission to the plunger at the upper end of the plunger head on. There to Forming a larger force is necessary than for demolding, this is

Positioning mechanically advantageous.

Particular preference is given to using at least two connecting rods, which are installed on both sides of the ram main at the centers of gravity. The two-point arrangement can be counteracted particularly effective tilting moments, which can occur during power transmission to the plunger.

The at least one connecting rod is preferably via a crankshaft through a

Powertrain offset in a vertical relative movement to the press table. As a drive for the crankshaft various engines of the prior art can be used, such as servomotors, asynchronous motors or torque motors.

In a preferred embodiment of the invention, the plunger head and the plunger base are guided in a frame of the transfer press by means of linear bearings. As a result, off-center loads on the plunger can be effectively absorbed. The frame of the transfer press (press frame) for this purpose, for example, have a rectangular frame, which ensures high stability.

In a preferred embodiment, the linear bearings

Profile rail guides, preferably roller circulation units, and / or hydrodynamic plain bearings.

Profile rail guides are well known in the art. At these bearings, rolling elements roll on a guide rail and within a carriage. Preferably, the guide rail is attached to the frame, while the guide carriage is fixed to the plunger. As rolling elements are at

Profile rail guides Balls (recirculating ball units) or rollers

(Roller circulation units) used. During the translational movement, the rolling elements are deflected in the carriage, so that one of the length of the

Profile rail corresponding linear movement (stroke) is possible. For the

Heat press circulating units are particularly suitable because they are characterized by a high load capacity and resilience. Since it is at the

Profile rail guides are standardized storage units, these can be easily and inexpensively replaced in case of wear.

Continue to profile rail guides and in particular Roller circulation units by a high-precision and backlash-free execution of the storage.

A particularly advantageous storage is in a lateral arrangement of

Profile rail guides on the ram possible because they withstand maximum loads. Here, however, a high manufacturing accuracy in terms of

Spacing of ram and frame required. Alternatively, the profile rails can for example also be attached to the back of the press frame, whereby the high demands of a lateral fitting of the plunger in the frame of the frame accounts. As a further alternative and hydrodynamic bearings can be selected.

These generally have greater tolerances over the accuracy of fit of the plunger in the guide within the frame and are also characterized by high lifetimes. With regard to precision, zero backlash and load capacity, however, the profiled rail guides have surprisingly proven to be a particularly preferred embodiment.

In a preferred embodiment of the invention, the transfer press comprises four linear bearing points which each guide the plunger head and the plunger foot laterally in a frame of the transfer press. The guidance accuracy and load capacity of off-center loads is particularly high in this storage. In a preferred embodiment of the invention transfer press the plunger is adjustable without play in a frame of the transfer press by means of lateral wedge adjustments. The wedge adjustments are preferably a separate assembly which is installed between the press frame and one side of the tappet guide. Preferably, the transfer press has two wedge adjustments, i. one at the height of the plunger head and one at the level of the plunger foot. The wedge displacements comprise two wedges which can be displaced relative to one another, wherein a vertical displacement of the wedges relative to one another leads to an increase or reduction of the lateral extent of the wedge adjustment. Due to the wedge adjustments can be

predefined installation state can be implemented in a simple and precise manner. The embodiment thus allows an exact lateral fitting of the plunger in the frame to ensure freedom from play. Such

Stellkonstruktion for fitting the plunger is particularly advantageous in the

Use of lateral profiled rail guides, such as the roller circulating units. In a preferred embodiment of the invention, each side part of the plunger assembly on a key for moving the plunger head and / or the plunger base in depth and a pivot point for rotation of the plunger head and / or the plunger base about a horizontal axis. These preferred adjusting mechanisms allow the top and bottom tools to achieve perfect concentricity. Preferably, the feather keys, preferably in each case a feather key on each side of the plunger, cause a displacement of the plunger head to the front or to the rear relative to the plunger base. Furthermore, allows a pivot point, which can be implemented for example by a bolt, a rotation of the plunger base about a horizontal axis, so that the lower tools can be aligned with the correct angle to the upper tools. Likewise, it may also be preferable to use the feather keys in the tappet foot and to align the tappet head over a pivot point: The degrees of freedom of the preferred locking structures advantageously allow the tappet head to be aligned with the tappet foot so that the corresponding upper and lower tools are perfectly inserted into the dies of the press table can. It has been shown that the

Stellbau with minimal effort occurring manufacturing tolerances of the components within the plunger assembly can compensate particularly effective. After alignment, the parts are preferably pinned together so that they form a rigid arrangement.

In a preferred embodiment of the invention, the transfer system for the workpieces comprises a swing body. As explained above, the forming of the workpieces preferably takes place in matrices provided for this, which are located in a tool block on a press table. The press table is fixedly connected to the press frame, so that the pressing force can be absorbed by the frame during the forming of the workpiece in the matrices. After forming, the workpiece is removed from the dies by an upward movement of the plunger by means of the lower tools. In this case, it is preferable to puncture the workpieces in gripper jaws of the swinging body. With the aid of eccentrics, the oscillating body is oscillated during operation of the transfer press between two positions. After the demolding step and before the next forming step, the workpieces are present in the swinging body and are transported by a transfer step from the first to the second position

(Preshoot). After the forming step and before the next demolding step takes place a swinging back of the swing body without workpieces from the second to first position. The sequence of process steps is thus carried out so that there is always a transport of the workpieces in the transfer direction. This will go through

Workpiece successive forming and removal steps from the first to the respective next die or die station until it can be ejected from the transfer press. In a die station can contain a plurality of matrices, which are arranged one below the other for a forming step.

In a further embodiment of the invention, the heat press comprises at least two groups having at least two, preferably at least four,

Upper tools and aligned thereto at least two groups with at least two, preferably at least four, sub-tools, so that the transfer press can work in at least two tracks simultaneously workpieces. A track preferably designates an arrangement of the tools for successive forming in two or more steps from an incoming workpiece to

desired formed workpiece. By arranging at least two tracks in a transfer press, the productivity is exactly doubled with the same timing. By the ram according to the invention can also in this

Embodiment advantageously a compact design can be achieved. In known prior art transfer presses, widening the main or press ram to dispose multiple tracks would result in an equally large increase in both the height of the main tappet and the one or more lower tappets for demoulding. By the ram according to the invention, the dimensioning of the press can be kept significantly smaller without jeopardizing a healthy leadership ratio of the plunger. The advantages of the construction of the plunger according to the invention thus lead in particular as an application for high-performance transfer presses with multiple tracks to excellent

Results.

In a preferred embodiment of the invention, the transfer press is suitable for reshaping cup-shaped workpieces made of sheet metal, particularly preferably for producing cartridge casings. For this purpose, it is particularly preferred that the plunger has a width and a height between 500 mm and 1500 mm, more preferably between 800 mm and 1200 mm, most preferably between 950 mm and 1050 mm. It is particularly preferred to choose a guide ratio of the plunger width to height of 1 to at least 0.5, more preferably 1 to at least 1. By the mentioned

Sizing, the transfer press is particularly suitable for the high forces when forming cup-shaped workpieces of metal sheet, particularly preferably in the manufacture of cartridge cases to provide. In these cases, forming forces per drawing station of at least 30 kN, more preferably at least 40 kN, most preferably at least 50 kN, are preferably generated by the transfer press. Preferred drawing punches have diameters between 5 and 20 mm, more preferably between 8 and 12 mm.

The invention thus also relates in particular to the use of a

Heat press according to the invention or preferred embodiments for forming cup-shaped workpieces made of sheet metal, preferably for the production of cartridge cases.

It should be understood that various alternatives to the described embodiments of the invention may be utilized to practice the invention and to arrive at the inventive solution. The

The transfer press according to the invention is thus not restricted in its embodiments to the above preferred embodiments. Rather, a variety of design variants is conceivable, which may differ from the illustrated solution. The aim of the claims is to define the scope of the invention. The scope of the claims is directed to the inventive

Heat press, their use and equivalent embodiments of this cover.

Brief description of the drawings

Schematic 3D front view of a preferred embodiment of the transfer press for the representation of the plunger

Schematic sectional view of a preferred embodiment of the transfer press in the plane of forming the workpieces

Schematic sectional view of a preferred embodiment of the rolling circulating units and feather keys for mounting the

ram head

Schematic sectional views of a preferred embodiment of the transfer press to illustrate the alignment of the plunger head to the ram foot Fig. 5 Schematic representation of a preferred embodiment of

Transfer system of the transfer press

Detailed description of the pictures

Fig. 1 shows a schematic 3D front view of a preferred embodiment of the transfer press for the representation of the plunger. The preferred transfer press is used for forming cup-shaped workpieces made of sheet metal. For this purpose, the transfer press comprises upper tools 1 and lower tools 3. In the preferred embodiment shown, the transfer press has two tracks for processing the workpieces. The left and right lanes each comprise five upper tools or drawing punches 1 and aligned therewith five lower tools or

Demolding stamp 3. By a downward movement of the upper tools 1, the workpieces are formed or drawn in dies. An upward movement of the lower punch 3 ensures removal of the workpieces from the matrices. The matrices (not visible) are for the purpose of forming in a tool block 13 on the press table 11 before. The transport of the workpieces from one die to the next takes place by means of a transfer system 23.

During operation of the transfer press clocked movement of the upper tools 1 down to forming and the lower tools 3 upwards for demolding takes place, between these steps, the transfer system 23 each oscillates between two positions to a further transport of the workpieces

sure.

The common vertical relative movement of the upper and lower tools 1 and 3 to the press table 1 1 is implemented by a plunger. The plunger comprises a plunger head 5 for attachment of the upper tools 1 and a tappet foot 7 for fixing the lower tools 3. The plunger main 5 and the tappet foot 7 are rigidly connected to each other by two side parts 9. The plunger head 5, the plunger foot 7 and the press table 1 1 are in one plane, whereas the side parts 9 are guided by the plunger head 5 to 7 Stößelfuß. In the side view of

Heat press therefore have the side parts 9 a corresponding C-shape. The drive of the molded plunger is accomplished via two connecting rods 21 by means of a crankshaft 25, wherein the connecting rods 21 preferably attack each track in the center of gravity to ensure a stable power transmission. The plunger is movably mounted in the press frame 15 by means of four lateral roller circulation units 19, in order to enable precise vertical guidance. Two sided Keilverstellungen 17 serve the lateral fitting of the plunger in the

Guide frame of the press frame 15.

Advantageously, the plunger can be driven via a single drive motor (not shown), which controls the movement on the crankshaft 25, for example via a belt transmission, a flywheel, a clutch brake combination and a

Planetary gear transmits. A separate control of the upper and lower tools 1, 3 is not necessary because the plunger head 5 is rigidly connected by means of the side parts 9 with the plunger foot 7.

Fig. 2 shows a schematic sectional view of a preferred embodiment of the transfer press in the plane of forming the workpieces. In the sectional view it can be seen that the ram main 5 is present on the left side via a wedge adjustments 17 on the frame 15. The same applies to the tappet foot 7. In this way, a particularly simple fitting can be implemented. The vertically guided

Movement of the plunger in the press frame 15 is performed by roller circulating units 19. Fig. 3 shows a detailed view of the roller circulating units 19 and the key 29. By means of the key 29, the plunger main 5 in the depth of the transfer press, i. forward and backward, relative to the ram foot 7 are moved.

The orientation of the main and tappet foot 5 and 7 is illustrated in Fig. 4a, b. Fig. 4a is a front sectional view, while Fig. 4b is a side view. By two left-side wedge adjustments 17, a lateral displacement of the plunger head 5 and the tappet foot 7 is possible. Here, by a vertical displacement of the wedges of the wedge adjustment 17 whose width is adjusted, so that the plunger is fitted without play in the lateral frame of the press frame 15. The key 29 allows adjustment of the plunger head 5 in depth relative to the plunger foot 7. In addition, the bolt 33 allows tilting of the plunger base 7 and thus the lower tools 3 about a horizontal axis. As illustrated in the side view 6b, the lower tools 3 can thereby to the matrices and

Top tools 1 concentrically aligned.

Fig. 5 shows a schematic representation of a preferred embodiment of the transfer system 23 of the transfer press. This comprises a swing body 35 with gripper jaws 41 for receiving the workpieces. After forming, a workpiece is removed from the dies by an upward movement of the plunger by means of the lower tools 3. In this case, it is preferable to puncture the workpieces in gripper jaws 41 of the swinging body 35. With the aid of Servomotors 37 and eccentrics 39, the rocker body 35 can be driven during operation of the transfer press between two positions oscillating. After the demolding step and before the next forming step, the workpieces are present in the swinging body and are transported by a transfer step from the first to the second position (pre-swinging). After the forming step and before the next demolding step, the swinging body swing back without workpieces from the second to the first position. The sequence of process steps is thus carried out so that there is always a transport of the workpieces in the transfer direction.

LIST OF REFERENCES

1 upper tools

3 lower tools

5 pusher head

7 pestle foot

9 side panels

11 press table

13 tool block

15 press frame

17 wedge adjustments

19 roller circulating unit

21 connecting rods

23 transfer system

25 crankshaft

29 feather key

31 matrix

33 bolts

35 swinging body

37 servomotor

39 eccentric

41 gripper jaws

Claims

1. heat press for carrying out at least two forming and

Entformschritten steps of a workpiece comprising a tool block (13) on a press table (1 1) with at least two matrices (31) for receiving the workpiece, a transfer system (23) for transfer of the workpiece between the dies (31) and at least two upper tools (1 ) and at least two lower tools (3), which can perform relative to the press table (1 1), so that

in a first forming step, the workpiece from a first upper tool

(I) in a first die (31) can be converted,

in a first demolding step, the workpiece can be removed from the die (31) by a first lower tool (3),

in a transfer step, the workpiece can be aligned by the transfer system (23) to a second die (31),

in a second forming step, the workpiece from a second

Upper tool (1) in the second die (31) can be converted and in a second Entformschritt the workpiece by a second

Lower tool (3) from the second die (31) can be removed from the mold

characterized in that

the upper tools (1) are installed on a plunger head (5), the lower tools (3) are installed on a plunger foot (7) and the plunger head (5) and the plunger base (7) are rigidly connected to one another and form a plunger.

2. Heat press according to the previous claim

characterized in that

the plunger head (5) and the plunger base (7) by means of two side parts (9) are rigidly interconnected.

3. Heat press according to the previous claim

characterized in that

the plunger head (5), the plunger foot (7) and the press table (1 1) are present in one plane and the side parts (9) have a C-shape, so that the side parts (9) from the plunger head (5) to the plunger foot (7) in front of or behind the press table

(II).

4. Heat press according to one of the preceding claims

characterized in that

the ratio of the width to the height of the plunger 1 to at least 0.5, preferably 1 to at least 1.

5. Heat press according to one of the preceding claims

characterized in that

the transfer press has a central drive motor as a starting point of a drive train, which controls the movement of the plunger via at least one connecting rod (21).

6. Heat press according to the previous claim

characterized in that

two connecting rods (21) on the ram main (5) are installed and transmit the movement of the drive train on the plunger.

7. Heat press according to one of the preceding claims

characterized in that

the plunger head (5) and the plunger base (7) are guided in a press frame (15) by means of linear bearing points.

8. Heat press according to the previous claim

characterized in that

the linear bearings roller circulation units (19) and / or

hydrodynamic bearings are.

9. Heat press according to one of the preceding claims

characterized in that

the transfer press comprises four linear bearings, each of which guide the plunger head (5) and the plunger base (7) laterally in a press frame (15).

10. Heat press according to one of the preceding claims

characterized in that

the plunger in a press frame (15) by means of lateral

Wedge adjustments (17) is adjustable without clearance.

1 1. Transfer press according to one of the preceding claims 2-10

characterized in that

each side part (9) of the plunger a feather key (29) for displacement of the Plunger head (5) and / or the plunger base (7) in the depth and a pivot point (33) for rotating the plunger head (5) and / or the

Stößelfußes (7) has a horizontal axis.

12. Heat press according to one of the preceding claims

characterized in that

the transfer system (23) comprises a rocker body (35).

13. Heat press according to one of the preceding claims

characterized in that

the heat press at least two groups having at least two, preferably at least four, top tools (1) and at least two groups arranged therewith having at least two, preferably at least four,

Includes sub-tools (3), so that the transfer press can work simultaneously in at least two tracks.

14. Heat press according to one of the preceding claims

characterized in that

the transfer press for forming cup-shaped workpieces made of sheet metal, particularly preferably for the production of cartridge cases, is suitable.

15. Use of a heat press according to one of the preceding claims for forming cup-shaped workpieces made of sheet metal, preferably for the production of cartridge cases.