EP2361758A2 - Method for adjusting press parameters of a ceramic or metal powder press and ceramic or metal powder press for performing the method - Google Patents

Abstract

The method comprises pressing a pressing body to a predetermined pressing body dimension in an opening of a matrix (0) using stamps (7, 8, 17, 18) supported on stamp carriers (1, 2, 3, 4) and made of powder and/or granules, regulating an actuator (29) along a sequence of set-point values for pressing the pressing body during pressing within a pressing cycle, testing an observance of the sequence of the set-point values during the pressing, and performing a readjustment of the actuator during a deviation of the sequence of the set-point values larger than a tolerance value. The method comprises pressing a pressing body to a predetermined pressing body dimension in an opening of a matrix (0) using stamps (7, 8, 17, 18) supported on stamp carriers (1, 2, 3, 4) and made of powder and/or granules, regulating an actuator (29) along a sequence of set-point values for pressing the pressing body during pressing within a pressing cycle, testing an observance of the sequence of the set-point values during the pressing, performing a readjustment of the actuator during a deviation of the sequence of the set-point values larger than a tolerance value, and measuring an interval between a first measuring point on a first fixed stop (20, 21) that supports one of the stamp carriers onto a side of the matrix opening and a second measuring point on a second fixed stop that supports one of the stamp carriers onto an opposite side of the matrix opening for comparing the sequence of the set-point values. During pressing, 5% of the total pressing paths are determined at the last. A position of the front side edges of the first fixed stop turned towards the stamp carrier to be supported, a position of spaced markers on the fixed stops and/or a position of the measuring elements leading away from fixed stop are used as the measuring points. A position on a centrally placed first fixed stop is used as one of the measuring points, where the first fixed stop lies in a force line between the matrix opening and a force introduction area of a pressing drive. The pressing drive such as a main pressing cylinder is readjusted as the actuator. An independent claim is included for a ceramic- or metal powder press.

Description

The invention relates to a method for adjusting the press parameter of a ceramic or metal powder press with the above-mentioned features according to claim 1 or to a ceramic or metal powder press for carrying out the method with the above-mentioned features according to claim 6.

Ceramic or metal powder presses have a die in whose die opening a powder or granules is pressed into a compact by means of stamping. The punches are each seated on stamp carriers, which are adjustably arranged and controllable along a punch movement path as a function of adjustable pressing parameters. By means of a control device, a press drive is driven, which applies a main pressing force to press the compact by means of the punch. For pressing complex structured compacts, two or more punches are guided into the die opening of one or both sides. Each of the stamp sits on a separate stamp carrier. The punch carriers are adjustable relative to a base support or a base plate in order to be able to adjust the individual punches relative to one another in different positions.

In a final press position, in which a full pressing force acts on the punches and on the press body via the press drive, the individual punch carriers are supported by so-called fixed stops relative to the base carrier, so that in each case on one side of the Die opening considered the stamp relative to each other and occupy a defined pressing position relative to the stamp carriers and base members.

Also well known are so-called hydraulic presses in which the punch carrier with the punches are each supported directly via a piston / cylinder arrangement relative to the base support, so are not supported by fixed stops.

A problem in the operation of such presses is that when filling the powder or granules in the die opening fluctuations of the filled powder and powder composition occur, which in a conventional control on pressing forces or individual pressing positions of the individual dies by means of predetermined set values to errors part height of the pressed Lead the pressed body.

Until now, the focus has been on positioning individual axes as accurately as possible, in particular against fixed stops, in the final press position and then measuring the position of the upper piston or drawbar on the main press drive and making a control of it. In addition, an attempt is made to keep a powder flow control as optimal as possible. Under axes are understood in particular components lying on power flow lines between the press drive and the punches.

The object of the invention is to provide a method for adjusting the press parameter of a ceramic or metal powder press or a ceramic or metal powder press for carrying out such a method so as to compensate for changing ones Press conditions an improved and more accurate adjustment of press parameters is made possible.

This object is achieved by a method for press parameter adaptation of a ceramic or metal powder press with the features according to claim 1 or by a ceramic or metal powder press for performing such a method with the above-conceptual features according to claim 6. Advantageous embodiments are the subject of dependent claims.

Accordingly, a method for adjusting the press parameter of a ceramic or metal powder press is preferred in which in a die opening of a die by means of pistons carried on stamp carriers stamped powder and / or granules, a compact is pressed to a predetermined Presskörpermaß, wherein during pressing within a press cycle for pressing a At least one actuator is controlled along a succession of desired values of such a compact, while compliance with the sequence of desired values is checked during the pressing, and a readjustment of the at least one actuator is carried out in the event of a deviation from the sequence of desired values, in particular greater than a tolerance value. It is advantageous that, for comparison with the sequence of nominal values, a distance between a first measuring point on a fixed stop, which supports one of the punch carrier on one side of the die opening, and a second measuring point on a fixed stop, which one of the punch carrier on a side opposite thereto the die opening is supported, is measured. As pressing parameters, a control signal is thus regulated in particular, which serves to drive the actuator.

By measuring measuring points, that is to say predeterminable points on such fixed stops supporting the punch carriers, measuring points are determined which lie as close as possible to the punches which dive into the die opening during the pressing. As a result, an influence of compressions and thermal changes which can occur between different pressing cycles is best eliminated, so that the multiplicity of two or more of the measured distances and the setpoint values predetermined for them are not or only to a small extent influenced by such influences. As a result, deviations of the distance measured during a pressing cycle from the desired value advantageously correspond to a variation of the quantity of the powder and / or granulate to be pressed in the die opening. Accordingly, a deviation measured in this way can be used as a direct control variable in order to be able to correct the at least one actuator, in particular a control signal for the main press drive, during the same press cycle.

In particular, effects influencing the measurements, such as bending or compression of the height of an upper piston position measured to date for regulation, do not affect this distance measurement if the distance is determined as closely as possible to the resulting pressed part.

The tolerance value can be suitably determined depending on the accuracy of the pressed body dimension to be achieved. In extreme cases, an identity of the measured value and the setpoint or a tolerance value equal to zero may be required.

First investigations show that with a usual fluctuation of the material quantity of 1% a reduction of thereby caused compression deviations of the press components in the force path from eg 0.05 mm to 0.005 mm can be achieved. This is also the amount by which an improvement in the dimensional accuracy of the pressed compact can be achieved.

For pressing such compacts no solid, but powder, granules or a mixture of powder and granules is used in known manner as a compressible material. Usual components are metallic or ceramic materials.

It is preferred, when the distance is measured during pressing, in particular on the last 5% of the total pressing travel is measured. In particular, in the last press cycle phase before the final press position control of the forces acting on the pressed material forces can achieve an ideal Presskörpermaß. In the case of underpowder or excess quantities of powder, this leads to a deviation of the measured distances measured by the desired value, whereupon a readjustment is carried out, in particular by an increase of a main press cylinder pressing force.

In particular, a position of the end stops of the fixed stops facing the punch carrier to be supported, a position of markings spaced therefrom against the fixed stops and / or a position of measuring elements leading away from the fixed stop are used as the measuring points above or below the die. This makes it possible to measure at positions that give almost measured values, as if directly a stamp position would be measured, which is not possible because of the immersion of the stamp in the die opening. Also, compared to measurements on the stamp carriers influences of their deflection during pressing completely or at least almost completely excluded.

As the measuring points above or below the die, a position is advantageously used on at least one centrally located fixed stop, in particular a fixed stop which lies in line of force between the die opening of the die and a force introduction region of a / of the press drive.

In particular, a press drive, in particular a main press cylinder, is readjusted as the actuator. Under the press drive is the main press drive to understand, which applies the actual pressing force. Not or only partially auxiliary drives such as the actuators, which cause movement of the punch carrier relative to each other, since their influence on the one hand negligible relative to the press drive with regard to the high force differences and their effect in particular to the Pressendstellung out when applying the punch carrier to the fixed stops in Essentially neutralized. Such auxiliary drives, in particular auxiliary cylinders, serve e.g. for adjusting the individual punch carrier relative to each other. However, their adjustment usually does not cause any force acting on the powder pressing force, since they essentially serve to adjust the individual punch carrier when removing a pressed part. As the main press drive, in addition to a main press cylinder, other drive forms can also be used, such as e.g. mechanical drives, pneumatic drives or electric motor drives.

Accordingly, a ceramic or metal powder press with a die opening of a die and punches carried on stamp carriers, which are arranged and adjustable relative to one another, is preferred, so that from powder and / or granules a pressed body can be pressed to a predetermined pressed body dimension, and with a control device which is designed and / or accesses a program during the Pressing within a press cycle for pressing such a compact at least one actuator along a sequence of setpoints to control, for which during the pressing compliance with the sequence of setpoints can be tested and in a deviation from the sequence of setpoints - in particular greater tolerance value - a readjustment of at least one actuator is feasible. The press is advantageous by a position measuring device with which, for comparison with the sequence of nominal values, a distance between a first measuring point on a fixed stop, which supports one of the punch carrier on one side of the die opening, and a second measuring point on a fixed stop, which is one of the punch carrier is supported on an opposite side of the die opening, is measurable.

The position measuring device is preferably designed as a fixed stop distance measuring device and as such measures measuring points of a position of the punch carrier to be supported facing end side edges of the fixed stops, a position of spaced therefrom marks on the fixed stops and / or a position away from the fixed stop measuring elements.

The position-measuring device may advantageously be designed as a fixed-stop distance measuring device, wherein at least one of the measuring points is located at a centrally located fixed stop, in particular a fixed stop, which is arranged in line of force between the die opening of the die and a force introduction region of a press drive.

Particularly preferred is a position-measuring device, which has measuring elements, the one of the fixed stops or one of the base support away and to a Lead measuring device out. As a result, by means of predominantly simple mechanical elements, a direct distance measurement can be carried out without detouring over two position measured values and a calculated distance determination. These are, for example, rigid linkages which are easy to assemble and, as mechanical elements, are not rendered useless by the influence of dust or whirled-up powder residues.

At least one of the fixed stops and a base support supporting them at least in the final press position can be designed as at least two independent components, wherein the measuring point lies on the fixed stop itself. This solution is particularly preferred because the closer the measuring point is to the die opening, the more advantageous the effect of readjustment.

It can also be realized that at least one of the fixed stops has a base carrier or is rigidly connected at least in the final press position in the force flow line with the base carrier, wherein the measuring point is located on the base carrier. This solution is not quite so advantageous because the measuring point is clearly spaced from the die opening, but still offers an advantageous readjustment.

The control device of the press is in particular designed and / or accesses a program for carrying out such a preferred method.

Fig. 1

Komponenten einer Keramik- oder Metallpulverpresse in teilweise geschnittener Ansicht während eines Pressvorgangs sowie ein Ablaufdiagram eines bevorzugten Verfahrens zur Pressparameteranpassung und

Fig. 2

Komponenten einer demgegenüber modifizierten einer Keramik- oder Metallpulverpresse in einer Pressendstellung eines solchen Pressvorgangs.

An embodiment will be explained in more detail with reference to the drawing. Show it:

Fig. 1

Components of a ceramic or metal powder press in a partially sectioned view during a pressing operation and a flow chart of a preferred method for press parameter adjustment and

Fig. 2

Components of a modified ceramic or metal powder press in a Pressendstellung of such a pressing operation.

How out Fig. 1 and 2 can be seen centrally in an exemplary ceramic or metal powder press a die 0 is arranged in the die opening so-called powder P is compressible into a compact T. Under powder P is generally understood a powdered and / or granular material. Along a preferably vertically extending punch movement path, punches 7, 8, 17, 18 can be inserted into the die opening or relative to the die 0.

The punches 7, 8, 17, 18 are each supported by a punch carrier 3, 4, 1, 2 or are fastened to the stamp carriers 3, 4, 1, 2. An adjustment of the stamp 7, 8, 17, 18 is carried out accordingly by an adjustment of the punch carrier 3, 4, 1, 2 along the punch movement path. In the arrangement shown by way of example, two of the punches 7, 8 can be inserted from below or two punches 17, 18 from above into the die opening. However, more or less punch and corresponding punch carrier can be used in such a press arrangement.

In order to be able to adjust the individual punches 7, 8, 17, 18 and punch carriers 3, 4, 1, 2 and others for filling the die opening and for removing a compact T into relatively different positions, the individual die carriers 3, 4, 1 , 2 by means of actuators 9 - 12 relative to an associated upper base support. 5 or a lower base support 6 adjustably mounted. Preferably, the actuators 9 - 12 are formed by hydraulic adjusting drives. However, other drive systems can be used. In order to ensure a secure guide along the punch movement path, guide rods 13 are attached to the lower base support 13 parallel to the punch path, along which the individual punch carrier 1 - 4 and the upper base support 5 and the die 0 are mounted adjustable.

This arrangement can be fixed directly on a lower press frame 14 of the actual press by means of the lower base support 6, which is also referred to as a base plate. The exemplary press has from the lower press frame 14 upwardly leading side press frame 15, which on the upper side of the above-described arrangement in a transversely over the arrangement leading upper press frame 16 lead. On the upper press frame 16, an actual press drive is attached as an actuator 29, which applies a main pressing force. The press drive can be driven mechanically, electrically or hydraulically and brings about a pressing force on the upper base support 5 for pressing, so that the arrangement of the base supports 5, 6, the stamp carriers 1 - 4 arranged therebetween and the punches 7, 8, 17 fastened thereon , 18 is compressed along the stamp path.

Preference is given to an embodiment in which the base supports 5, 6 or the base plates are not firmly inserted into the press frame 14-16, but are releasably inserted again via adapter fastening elements 28. Instead of a fixed to a substrate attachment of the lower base support 6 to the lower press frame 14 can between the lower base support 6 and the lower press frame 14 optionally also an alternative or further press drive 29 * be arranged.

In order to be able to specify defined pressing positions for the punches 7, 8, 17, 18 in a final press position, fixed stops 19, 20 are respectively arranged between the upper base carrier 5 and the upper punch carriers 1, 2, which in the final press position constitute a rigid abutment of the punch carriers 1 , 2 effect on the upper base support 5. The fixed stop 19, which is designed as a fixed stop for the stamp carrier 2 furthest from the upper base support 5, protrudes there, just like a piston rod of the actuator 10 for this punch carrier 2, through a passage opening 21 which is formed in the stamp carrier 1 lying above it. therethrough. In a corresponding manner, the lower punch carrier 3, 4 are supported relative to the lower base support 6 via fixed stops 22, 23.

Under a fixed stop 19, 20, 22, 23 is thus understood in particular a stop, which is arranged as a support element for a punch carrier in the force path between the filled with powder P die opening and a press drive or a press base and on which is supported in a final press position of the punch carrier , By the fixed stop thus the possible movement distance of the adjacent stamp carrier and attached stamp is limited. Under the Pressendstellung is understood in particular that any further increasing pressing forces cause any changes in the position or the distance between the moving stamp carriers and the fixed stop more.

For controlling the various actuators 9 - 12 and the press drive as the actuator 29 is a control device C, which corresponding control signals s1, s2, s3, ..., s29 applies to this. Optionally, the control device C can apply further control signals, for example, to motor-adjustable fixed stops, which can be adapted as further pressing parameters for adapting the pressed-body dimension.

The control device C can access in a conventional manner an integrated or external memory device M in which control programs and, if appropriate, standard values for controlling or regulating the various pressing parameters for e.g. Actuators 9 - 12 and the press drive are stored as the actuator 29.

To carry out a preferred method for adjusting the press parameter in such a ceramic or metal powder press, the arrangement additionally has at least one position measuring device S which is used to determine a current position of at least part of the fixed stops 19, 20, 22, 23 and optionally a current position of the upper or Lower base support 5, 6 is arranged in the press. In particular, by means of the position measuring device S and, if necessary, the control device C is a distance or a distance d (t) of two measuring points or points on the fixed stops 19, 20, 22, 23, in particular a fixed stop 19 above or a fixed stop 23 below the die opening or die (0) at various times t1, t2, t3, ... of the advancing time t during pressing.

In order to determine the distance d (t) between two measuring points, the two measuring points on the fixed stops 19, 23 are preferably set as close as possible to the die opening, in particular with regard to a force flow in the final press position. This results in a distance d (t), which is more independent of a commonly measured Distance between the upper press frame 16 and the upper base support 5 results. This applies even with different powder fillings of the die opening between different pressing cycles.

The position measuring device S is attached to the side press frame 15, for example. However, the position measuring device S can also extend as an independent device starting from a substrate or the lower press frame 14 parallel to the pressing direction in a region laterally adjacent to the punch carrier 1 - 4 and optionally base support 5, so that compression or expansion influences on the press frame no Have influence on the position measurements.

As a further exemplary embodiment, the position measuring device S can also be attached to a component of the pressing tool, e.g. be attached to a punch carrier 1 - 4 or a base support 5, 6 and starting from this parallel to the pressing direction leader in a range laterally adjacent to the stamp carriers 3, 4, 1, 2 and optionally base supports 6, 5 extend relative to those of the distance d (t) is to be determined. Preferably, the position measuring device is attached to the fixed stops themselves.

For measuring the position of the individual positions to be measured, it is possible to use any measuring methods, in particular mechanical, but also electromechanical or optical measuring methods. For example, an image can optionally be taken by means of a camera in which the control device C and a suitable program are used to search for desired structures, for example a fixed stop edge or a mark on the fixed stop.

In a first method sequence, currently measured positions or distances d (t1), d (t2), d (t3) or corresponding measured values m2, m4 are measured at different times t1, t2, t3 and in particular after a pressing of such a compact T with the desired predetermined compact dimension as reference values, reference distance or nominal values d _soll (t) are stored in the memory device M and / or the processor C. However, such desired values d _soll (t) can also be determined in other ways, in particular on the basis of the powder quality and the predetermined compact dimension by calculation.

In a later method sequence, currently measured positions or distances d (t1), d (t2), d (t3) or corresponding measured values are respectively measured at these different times t1, t2, t3. These measured values or distances d (t) but then with the previously stored reference values _to d (t) is compared. In the case of a deviation, in particular in the case of a deviation greater than a tolerance value Δ, a suitable readjustment of the press drive is carried out. This avoids deviations of the compressed body T compressed in this cycle, in particular of a predetermined compacted body dimension, which would otherwise result in deviations of a powder quality or powder quantity.

In particular, the individual measured positions or distances d (t) are measured independently of fixed reference positions h0, eg a height of the lower press frame 14 or a height h0 ^{* of} the upper press frame 16.

As well as out Fig. 1 As can be seen, a preferred method for press parameter adjustment comprises a plurality of individual method steps S1-S5.

As a precondition, reference values or preferably setpoint values d (t) determined therefrom are stored in the memory device M.

Subsequently, a plurality of such compacts T is pressed in the regular press production operation by means of the respective process steps S1-S5.

In a first method step S1, it is checked whether the desired compact dimension dT _{end has been} reached. If so, the pressing process or at least the readjustment of the at least one actuator 29 is terminated. If not, in a second method step S2 a measurement of the instantaneous positions of the fixed stops 19, 23 is carried out and the resulting measured values m2, m4 or the distance d (t) between them are determined.

A subsequent third method step S3 relates to a check of the distance d (t) just measured in relation to the setpoint value d _soll (t) stored for the corresponding time t1, t2,....

If, in comparison, the distance d (t) just measured is equal to the corresponding desired value d _soll (t), in particular within a tolerance value Δ, then, as the subsequent method step S4, the method jumps to the first method step S1 while maintaining the control.

If, in comparison, the distance d (t) just measured deviates from the corresponding desired value d _soll (t), in particular by more than the tolerance value Δ, then in the following method step S5 the pressing means are changed by the control device C such that a readjustment of the at least an actuator 29 still in the same press cycle is made so that the compact to be pressed in this cycle T is pressed with the desired compact dimension. In particular, a pressing force or a pressing pressure p, which acts on the entire arrangement of the press components via the press drive 29, is readjusted. Thereafter, the first step S1 is jumped.

It has been described above to determine a distance d (t) of two measuring points m 2, m 4 at the two closest to the die 0 and thus particularly preferred fixed stops 19, 23, above or below the die opening or the die (0). In principle, however, such measurements can also be made on other fixed stops 19, 20, 22, 23 and in other combinations of fixed stops 19, 20, 22, 23. As an example, it is possible to determine an alternative or additional distance d * (t) between the other two of the illustrated fixed stops 20, 22.

In order to determine the measured values m2, m3, it is particularly preferable to measure the respective instantaneous position of the front side edges of the fixed stops 19, 22 facing the punch carrier 2, 3 to be supported, and then determine their spacing therefrom. However, markings x which are spaced therefrom may also be formed on the fixed stops 20, 23, which are detected for distance measurement, so that any occlusions of the end faces in the case of easily deflecting punch carriers do not falsify the measurement result.

Fig. 1 shows the components of the ceramic or metal powder press during a pressing operation before reaching the final press position for example, a third time t3 in the distance-time diagram, which exemplifies a curve from setpoint values d _soll (t) and a curve at the momentary pressing process measured distances d (t) shows. It can be seen that the punches 7, 8, 17, 18 already compress the powder P present in the die opening. However, the stamp carriers 1 - 4 are not yet on their fixed stops 20, 19, 22 and 23 respectively. Nevertheless, powder fluctuations already have an influence on this pressing stage, which is why the checking of the distance d (t) and, if necessary, the readjustment of the control value 29 is already carried out. It is particularly advantageous to start measuring and comparing the distances shortly before reaching the final press position.

Fig. 2 In contrast, shows the Pressendstellung in which the powder was pressed in the die opening to the compact T. In this phase, the punch carrier 1 - 4 firmly supported on the fixed stops 20, 19, 22 and 23 respectively.

Also shows Fig. 2 a preferred embodiment of a position measuring device S *. This position measuring device S ^* or parts thereof are arranged directly on components of the pressing tool, for example on one of the fixed stops 23 or one of the base supports 5, 6. The position measuring device S ^* extends starting parallel to the pressing direction leading laterally next to the stamp carriers 3, 4, 1 , 2 and optionally base supports 6, 5.

In the illustrated embodiment, a measuring element S ° laterally leads away from one of the lower fixed stops 23, wherein the measuring element S ° moves in the case of movement of the fixed stop 23 along the adjustment direction of the punch uniformly together with the movement of the fixed stop 23. Another such measuring element S ° leads laterally away from the upper base body 5. The further measuring element S ° moves longitudinally in the case of a movement of the base body 5 The adjusting direction of the punches is uniform along with the movement of the base body 5. Laterally of the entire arrangement, elements, in particular rod-shaped elements of the two measuring elements S ° project substantially into one another in a measuring device. The measuring device can thus determine a relative adjustment of the two measuring elements S ° and thus directly a change in the distance d (t).

Insofar as the further measuring element S ° leads away from the base body 5, this does not contradict the determination of the distance d (t) of two fixed stops 23, 20, since, depending on the embodiment, the base body itself can be a direct component of a fixed stop or usually at least one connection via a rigid stop Components to the fixed stops 19, 20, 22, 23 has.

The use of height-adjustable fixed stops is also possible as these, if at all, are only adjusted between press cycles and act as rigid components during a press cycle.

Described above is to determine the set values and the distances during a pressing operation at predetermined times during the pressing. However, this does not rule out using a different reference as a criterion for the measurements, for example taking the distance measurements when certain pressing forces or pressures are reached.

LIST OF REFERENCE NUMBERS

0

die

1

stamp carrier

2

stamp carrier

3

stamp carrier

4

stamp carrier

5

base support

6

base support

7

stamp

8th

stamp

9

actuator

10

actuator

11

actuator

12

actuator

13

guide rods

14

press frame

15

press frame

16

press frame

17

stamp

18

stamp

19

fixed stop

20

fixed stop

21

Through opening

22

fixed stop

23

fixed stop

28

Adapter fastener

29, 29 *

Actuator, in particular main press drive

C

Controller / processor

d (t)

Distance between two measuring points above or below the die opening

d * (t)

Distance between two other measuring points above or below the die opening

dT _End

given compact size

d _should (t)

Sequence of setpoints or reference distances

h0

Height of the lower press frame

h0 ^*

Height of the upper press frame

m1 - m5

readings

M

memory device

P

print

P

powder

S, S *

Position measuring device

S °

measuring element

s1, s2, s3, s29

control signals

S1 - S5

steps

t

Time

t1, t2, t3, ...

Time points of the measurements

T

compacts

t1, t2, t3

different times to each other

x

mark

Δ

tolerance

Claims (12)

Method for adjusting the press parameter of a ceramic or metal powder press, in which in a die opening of a die (0) by means of stamps (1, 2, 3, 4) carried punches (17, 18, 7, 8) of powder (P) and / or Granules a compact (T) to a predetermined compact size (dT _end ) is pressed, wherein during the pressing, within a pressing cycle for pressing such a compact, at least one actuator (29) _is controlled along a succession of desired values (d _soll (t)), - compliance with the sequence of target values (d _soll (t)) is checked during pressing, and in the case of a deviation from the sequence of desired values (d _soll (t)) -in particular greater than a tolerance value (Δ) -a readjustment of the at least one actuator (29) is carried out,
characterized in that for comparison with the sequence of nominal values (d _soll (t)), a distance (d (t); d * (t)) between a first measuring point (m1; m2) at a fixed stop (20; 21), which corresponds to one of A second measuring point (m3, m4) is measured on a fixed stop (22, 23), which supports one of the punch carriers (3, 4) on an opposite side of the die opening becomes. Method according to Claim 1, in which the distance (d; d *) is measured during the pressing, in particular over the last 5% of the total pressing travel. Method according to claim 1 or 2, in which the measuring points (m2, m3) are a position of the end side edges of the end face edges facing the punch carrier (2, 3) to be supported Fixed stops (19, 22), a position of which spaced marks (x) on the fixed stops (20, 23) and / or a position of away from the fixed stop measuring elements (S °) are used. Method according to one of the preceding claims, in which one position on at least one centrally located fixed stop (19, 22) is used as one of the measuring points (m2, m3), in particular a fixed stop (19, 22) which is in line of force between the die opening of the die (0) and a force application area of a / the press drive is located. Method according to one of the preceding claims, in which a press drive, in particular a main press cylinder, is readjusted as the actuator (29). Ceramic or metal powder press with - A die opening of a die (0) and on stamp carriers (1, 2, 3, 4) carried punches (17, 18, 7, 8), which are arranged and mutually adjustable that of powder (P) and / or granules Pressing body (T) to a predetermined Presskörpermaß (dT _end ) is pressed, and - a control device (C), which is designed and / or accesses a program, during pressing within a pressing cycle for pressing such a compact (T) at least one actuator (29) along a sequence of desired values (d _soll (t)) to regulate, for which during the pressing a compliance with the sequence of target values (d _soll (t)) can be tested and at a deviation from the sequence of target values (d _soll (t)) - in particular greater a tolerance value (Δ) - a readjustment of at least one actuator (29) is feasible,
marked by - A position measuring device (S), with the comparison with the sequence of desired values (d _soll (t)) a distance (d (t); d * (t)) between a first measuring point (m1; m2) at a fixed stop (20; 21), which one of the punch carrier (1 2) is supported on one side of the die opening, and a second measuring point (m3; m4) is measurable on a fixed stop (22; 23) which supports one of the die carriers (3; 4) on an opposite side of the die opening. Press according to Claim 6, in which the position-measuring device (S) is designed as a fixed-stop distance measuring device and as such measuring points (m2, m3) a position of the front side edges of the fixed stops (19, 22) facing the punch carrier (2, 3) to be supported from spaced apart markings (x) on the fixed stops (20, 23) and / or a position of measuring elements (S °) leading away from the fixed stop. Press according to Claim 6 or 7, in which the position-measuring device (S) is designed as a fixed-stop distance measuring device, one of the measuring points (m2, m3) lying on a fixed stop (19, 22) which is as central as possible, in particular a fixed stop (19, 22 ), which is arranged in line of force between the die opening of the die (0) and a force introduction region of a press drive. Press according to one of Claims 6 to 8, in which the position-measuring device (S *) has at least one measuring element (S °) which leads away from one of the fixed stops (23) or from one of the base carriers (5) and to a measuring device. Press according to one of claims 6 to 9, wherein at least one of the fixed stops (23) and a this at least in pressing end position supporting base support (6) are designed as at least two separate components and the measuring point on the fixed stop (23) itself is located. Press according to one of claims 6 to 10, wherein at least one of the fixed stops (20) has a base support (5) or rigidly connected at least in Pressendstellung in power flow line with the base support (5) and the measuring point on the base support (5). Press according to one of claims 6 to 11, wherein the control device is designed and / or accesses a program for carrying out the method according to one of claims 1 to 5.

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