Method for powder pressing at least two press parts and powder pressing device

Abstract

The invention relates to a method for powder pressing at least two pressed parts, in particular ceramic powder pressed parts and/or metal powder pressed parts, wherein a first powder (17) for pressing a first pressed part is filled into a first cavity (13) of a die (12) with a first filling level and a second powder (18) for pressing a second pressed part is filled into a second cavity (14) of the die (12) with a second filling level, wherein the first and second filling levels are individually adjusted. Preferably, the first powder is filled via a first filling shoe and the second powder is filled via a second filling shoe, wherein the two filling shoes, at least temporarily, are not moved simultaneously. A powder pressing device is also claimed which is suitable for implementing the aforementioned method.

Claims

1. A method for powder pressing at least two pressed parts, wherein the pressed parts are ceramic powder pressed parts and/or metal powder pressed parts, the method comprising: filling a first powder for pressing a first pressed part into a first cavity of a die with a first filling level, and filling a second powder for pressing a second pressed part into a second cavity of the die with a second filling level, wherein the first and second filling levels are individually adjusted, wherein the first powder is filled via a first filling shoe, and the second powder is filled via a second filling shoe, and wherein the first and second filling shoe are configured to move temporarily non-simultaneously such that the first filling shoe is already removed from the first cavity while the second filling shoe still remains above the second cavity.

2. The method according to claim 1, wherein: during filling into at least one cavity, at least two filling operations are carried out, wherein a first filling operation for filling the second powder into the second cavity takes place before and/or during a filling operation for filling the first powder into the first cavity and a second filling operation for filling the second powder into the second cavity takes place, while no filling operation for filling the first powder into the first cavity takes place after the first filling shoe has already been moved away from the first cavity.

3. The method according to claim 1, wherein a complete filling of the first cavity is completed before a complete filling of the second cavity is completed.

4. The method according to claim 1, wherein at least one first lower punch associated with the first cavity and/or at least one second lower punch associated with the second cavity are supported in a non-floating manner.

5. The method according to claim 1, wherein a measurement of the first and second pressed parts is obtained individually, after pressing, wherein on the basis of the measurement, a new first and/or second filling level is calculated, and subsequently a complete filling of that cavity to which a lower filling level has been assigned takes place before the other cavity is completely filled.

6. The method according to claim 1, wherein the first and/or second cavity after the respective filling and/or immediately before an interruption of the respective filling and/or immediately before a pressing operation is/are filled to its/their respective upper edge or is/are not filled to its/their respective upper edge, such that the second cavity is filled to its upper edge after the filling and the first cavity is not, and/or after the respective filling of the first and second cavities and/or immediately before a pressing operation, an upper end of a first filling in the first cavity and an upper end of a second filling in the second cavity are at the same height or at different heights and/or a lower end of the first filling in the first cavity and a lower end of the second filling in the second cavity are at the same height or at different heights.

7. The method according to claim 1, wherein at least one first lower punch associated with the first cavity and at least one second lower punch associated with the second cavity are moved before and/or during the filling of the corresponding cavity independently of each other and/or are coupled to different plates.

8. The method according to claim 1, wherein at least one first lower punch associated with the first cavity and at least one second lower punch associated with the second cavity before and/or during the filling of the corresponding cavity are moved or movable only together and/or are coupled to the same plate.

9. The method according to claim 2, wherein the at least two filling operations are carried out during filling into the second cavity.

10. The method according to claim 5, wherein the measurement is a weight.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following, the invention is described by means of exemplary embodiments which are explained in more detail with reference to the figures. Hereby show:

(2) FIG. 1 a first embodiment of a pressing device in a schematic view from above;

(3) FIG. 2 the embodiment according to FIG. 1 in a schematic sectional view;

(4) FIG. 3 the embodiment according to FIG. 1 in a different state;

(5) FIG. 4 a schematic sectional view of the state according to FIG. 3;

(6) FIG. 5 a schematic representation of the embodiment according to FIG. 1 in a view from above in a further state;

(7) FIG. 6 a schematic sectional view of the state according to FIG. 5;

(8) FIG. 7 a schematic view of the embodiment according to FIG. 1 from above in a further state;

(9) FIG. 8 the state according to FIG. 7 in a schematic sectional view;

(10) FIG. 9 a further embodiment of the pressing device in a schematic view from above;

(11) FIG. 10 a schematic sectional view of the embodiment according to FIG. 9;

(12) FIG. 11 a top view of the embodiment according to FIG. 9 in a further state;

(13) FIG. 12 a schematic sectional view of the state according to FIG. 11;

(14) FIG. 13 the embodiment according to FIG. 9 in a schematic view from above in a further state;

(15) FIG. 14 a schematic sectional view of the state according to FIG. 13.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(16) In the following description, the same reference numbers are used for identical and equally acting parts.

(17) FIG. 1 shows a (highly) schematic view of a pressing device according to the invention from above. The pressing device comprises a first filling shoe 10, a second filling shoe 11, a die 12 as well as a first cavity 13 and a second cavity 14. In the first cavity 13, a first pressed part (not shown) can be pressed; in the second cavity 14, a second pressed part (also not shown) can be pressed. In the state of the pressing device according to FIG. 1, the filling shoes 10, 11 are not arranged above the cavities 13, 14. In this state, no starting material (powder) is filled into the cavities 13, 14.

(18) According to FIG. 2, the cavities 13, 14 are delimited by a first lower punch 15 and a second lower punch 16. It is also possible to provide several, for example two, lower punches per cavity.

(19) The filling shoes 10, 11 are arranged next to each other or on the same level and are driven by two independent filling axes according to the embodiment.

(20) In FIG. 3, the filling shoes 10, 11 according to FIG. 1 are now arranged above the cavities 13, 14. Thus a first powder 17 (see FIG. 4) and a second powder 18 can be filled into the cavities 13, 14. In FIG. 4 the cavities (in their extension according to FIG. 4) are filled up to an upper edge of the same with the respective powder 17, 18. An upper end of the respective filling in the first cavity 13 is thus at the level of an upper end of the filling of the second cavity 14. Here, in the same way, a lower end of the filling in the first cavity 13 is (which is not obligatory) at the level of a lower end of the filling in the first cavity 14.

(21) In FIG. 4 thus a first filling position (of the lower punches 15, 16, which are preferably movable together here) is shown. This first filling position preferably depends on the cavity with the lower (required or necessary) filling level. According to the embodiment, both filling shoes can be moved synchronously over the cavities 13, 14.

(22) The first filling shoe 10 carries out a filling process and then moves back to its starting position (see FIG. 5). The second filling shoe 11 remains stationary above the associated cavity 14 (after it has also carried out a filling process).

(23) At a time when the first filling shoe 10 is no longer above the associated cavity 13, the die 12 and/or at least one plate (not shown) associated with the lower punches 15, 16 is moved, thus resulting in a relative movement between die and punches 15, 16 (see FIG. 8). This allows further material of the second powder 18 to be filled into the second cavity 14. Overall, the filling level in the second cavity 14 is thus greater than in the first cavity 13.

(24) After the second filling shoe 11 has completed the (complete) filling, a pressing cycle is performed in a known manner.

(25) After pressing, the pressed parts coming from the two cavities are weighed (individually). Based on the respective part weight, new filling levels are calculated and, if necessary, a filling level adjustment is carried out (automatically).

(26) At first, then the cavity with the compared lower (required or necessary) filling level is filled.

(27) FIGS. 9-14 show an alternative embodiment. Here the first lower punch 15 and the second lower punch 16 are movable via a first lower punch plate 20 and a second lower punch plate 21, respectively. In the initial position according to FIGS. 9 and 10, the filling shoes 10, 11 are not above the associated cavities 13, 14 and upper ends 22, 23 of the lower punches 15, 16 are on the same level. In this state the cavities 13, 14 are of the same height.

(28) Now, according to FIGS. 11, 12, the second lower punch plate 21 is moved downwards, the first lower punch plate 20 remaining in the same place in this case (although it can also be moved if necessary). The filling shoes 10, 11 (see FIG. 11) are still in their initial position (but may also already be at least partially displaced).

(29) Now the filling shoes 10, 11 (see FIG. 13) are placed above the cavities 13, 14 (in a joint or individual movement). After the cavity 14 has been enlarged according to FIG. 12, the filling level of the second powder material 18 correspondingly shown in FIG. 14 is now also enlarged. In this embodiment, the filling and pressing position of several, possibly all, punches can be adjusted individually. A corresponding programming may be provided for the individual filling level adjustment.

(30) At this point, it should be noted that all of the parts described above, taken individually and in any combination, in particular the details shown in the drawings, are claimed to be essential to the invention. Modifications hereof are familiar to the person skilled in the art.

REFERENCE SIGNS

(31) 10 First filling shoe 11 Second filling shoe 12 Die 13 First cavity 14 Second cavity 15 First lower punch 16 Second lower punch 17 First powder 18 Second powder 20 First lower punch plate 21 Second lower punch plate 22 Upper end of first lower punch 15 23 Upper end of second lower punch 16