DE3406526A1 - Sliding table with built-in blank-holder frame - Google Patents

Abstract

The invention relates to a single-acting press with a drawing cushion in the press table and with a sliding table. The object of the invention is to construct such a press in such a way that even conventional tools from a mechanical drawing press with a downward-acting ram and blank holder can be installed the other way round. The disadvantages which arise in connection with the known air bolts are furthermore to be avoided. This is achieved by the fact that a vertically guided blank-holder frame (2) is let into the sliding table 1, the said frame being supported from below on a plurality of, preferably four, pneumatically or hydraulically actuable pillars. <IMAGE>

Description

Single-acting press with a draw cushion in the press table

and a sliding table.

and a sliding table.

The invention relates to a single-acting press with a drawing cushion in the press table and a sliding table.

Single-acting body presses with sliding tables are often with draw cushions equipped in the press table. The drawing cushions act on a so-called floating plate in the sliding table. Above this floating plate there is a hole pattern over the entire surface arranged distributed. Bolts are inserted into this hole pattern as required act on the blank holder frame of the tool when sheet metal parts are on the machine should be drawn.

About the relatively large blank holder force with large tools To transfer with relatively thin bolts, many bolts are required. If the length of the bolts is not exactly matched, the result is uneven Beat the blank holder forces and the bolts that are a little too long or more stressed a.

That the bolts are also in the right holes and in the right one Number and arrangement to be plugged requires an exact one from the set-up and reliable work, otherwise there will be breakage. The tool design must also make sure that there is a surface at the respective bolt location. Tools, previously used in mechanical drawing presses with drawing rams and sheet metal holders cannot simply be installed the other way around.

The invention has set itself the task of a press of the to be designed in such a way that conventional tools can also be used from a mechanical drawing press with a ram working from top to bottom and Sheet metal holders can be installed the other way around. Furthermore, the well-known The disadvantages that occur with air bolts werelon avoided To this end it is proposed according to the invention that in the sliding table 1 a vertically guided Sheet metal holder frame 2 is embedded, which is down to several, preferably four pneumatically or hydraulically actuated columns 6 is supported. Farther it is advantageous that the pressure of each of the columns 6 can be adjusted separately.

This training makes it possible in many cases to work with one Draw cushions obtain drawing results that were previously only possible with a mechanical one Drawing press were possible. This is because the sheet metal bracket does not have pins on the tool, but via a blank holder frame, like a mechanical one Drawing press takes place. This is particularly useful when installing in a large part transfer press enormous benefits.

The invention is based on a drawing showing any exemplary embodiment illustrates, explained in more detail: FIG. 1 shows a plan view of the sliding table and FIG. 2 shows a section along the line A-B of FIG. 1.

For the sake of simplicity, only the stands are of the actual press 9 and the press table 8 indicated. The sliding table 1 can li on by means of wheels Running rails 10 moved out of the tool room of the press for changing tools will.

In the sliding table 1, a sheet metal holder frame 2 is embedded and guided. This sheet metal holder frame takes the sheet metal holder 3 of the tool and is with connected to this. A receptacle 4 is located inside the sheet metal holder frame for the drawing punch 5 with fastening devices, not shown, for the same. The blank holder frame 2 and the receptacle 4 for the drawing punch 5 correspond to FIG their clamping surfaces the surfaces of lechhaltcr and slide rams for mechanical drawing presses, only they are now arranged on the sliding table 1. the In the example, the sheet metal holder frame 2 is actuated via four columns 6.

Each of these columns 6 comes from a pressure cylinder 7, which is pneumatic or, in the case of larger versions, is operated hydraulically with a battery, with each of the Columns 6 can be set in the pressure for itself, as known per se, e.g. from P 32 42 705.0-14. As is known, the stroke of the pressure cylinders 7 can be set jointly and be limited. If necessary, the pressure cylinders can also be in the lower position be held and start up again in a controlled manner.

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Claims (2)

Claims 1. Single-acting press with a die cushion in the Press table and a sliding table that a vertically guided sheet metal holder frame (2) is embedded in the sliding table (1) is that down on several, preferably four pneumatically or hydraulically loadable columns (6) supported. 2. Press according to claim 1, d a d u r c h g e k e n n z e i c h n e t that each of the columns (6) can be adjusted separately in terms of pressure.