DE9311517U1 - Matrix withdrawal system - Google Patents

Description

Die removal system Description

The invention relates to an improvement in mechanical presses, preferably for the uniform compaction of powdered materials.

Mechanical presses of known design are characterized by the fact that the powder to be compacted is either compacted from above or from below in a suitable die, or the die is pulled off during the pressing process via the resulting wall friction between the upper punch and the die wall or by a curve and is thus compacted first from above and then from below. The press table is usually supported by a mechanical braking system or by hydraulics.

With the known systems it is difficult to control the pressing process in such a way that the neutral phase of the pressed part is obtained at the desired location, preferably in the middle of the pressed part.

The invention avoids these disadvantages by using a mechanical lever system to pull the die in a desired ratio to the upper punch movement. This is achieved by dividing the pull lever into equal lengths so that the die pushed down by the lever travels half the distance as the press punch coming from above.

Since the lower punch is firmly mounted on the press housing, there is a relative movement to the die and a pressed part that is compressed exactly the same on both sides. The start of the defined relative movement between the die, lower and upper punch is initiated by the height-adjustable pull-off cam. This system produces a pressed part in which the density distribution is guaranteed in an optimal manner.

Figure 1 to Figure 3 provide further details

1 Upper traverse with upper stamp, tension columns and lower traverse

Upper punch press chamber with powder to be compacted

4 die table with extraction columns, extraction traverse and table brake

5 lower stamps

6 Press body

7 Table brake

8 Main shaft with press eccentric

9 Trigger bar firmly connected to the die table

10 trigger cams

11 Trigger

13 Holding lever firmly connected to the press body

In Figure 1 it can be seen that point B of a lever with length L moves downwards by 0.5X for a distance X of point C if point A does not change its position. In practice, points B and C are of course on a circular path.

In Figure 2, this principle is applied to a mechanical powder press with a crankshaft drive, with the lever system mounted under the die table (4). The trigger rod (10) moves downwards at half the speed of the trigger cam (11), which engages the outer end of the trigger lever (12). The retaining bolt (13) is firmly connected to the press body (6).

To avoid jamming, two of these die removal systems must be arranged symmetrically under the die table (4).

The same principle is shown in Figure 3, with only one trigger lever (12) inside the press frame (6) pressing vertically on the lower table crossbeam. This principle has the advantage that it is easier to adjust and that the columns cannot become jammed.

Claims (1)

Protection claims Die removal system for defined lowering of the die table (4) in a desired ratio to the upper punch speed, preferably in a ratio of 1:2 Die removal system according to claim 1, characterized in that it is mounted below the die table (4). Die removal system according to claim 1, characterized in that it removes the die table (4) at a central location. Die extraction system according to claims 1 to 3, characterized in that the start of the compression on both sides can be set as required by adjustable extraction cams (11)