DE9007590U1 - Tool spring filled with nitrogen gas - Google Patents

Description

Wolfgang K a t &zgr; Niadereschacher Str.

7735 Dauchingen

Description for the "Tool spring filled with nitrogen gas"

Tool threads for non-cutting forming (drawing, bending, cutting) have long been used as spiral and disc springs or springs made of rubber and plastic. The springs are intended to generate counter-holding forces for the work process.

These aforementioned springs have been supplemented for some time by nitrogen spring elements. They basically consist of a steel cylinder in which a piston with a piston rod is guided, sealed to the outside (Figure I).

The cylinder is filled with nitrogen gas via a valve. The compressible gas produces significantly better spring properties or spring rates than spiral or disc springs at a relatively small pressure. During operation, the press ram pushes the piston rod and thus the piston downwards and compresses the gas to a certain higher pressure (Fig. II). When the press ram goes back up, the gas expands again to its original pressure.

The power of this current system is:

With large cylinder strokes and high ram speeds, friction and thus heating are high.

Due to the heating, the gas pressure increases and changes the working conditions extremely.

Due to heating and the increase in gas pressure, the sealing parts wear out relatively quickly and the tool quickly loses its function due to leakage.

VJoIfgang K a t &zgr; Niedereschacher Str. 42

7735 Dauchingen

The previous systems have too little filling space in their solid design (piston and piston rod volume are not part of the filling space). As a result, the compression at bottom dead center is too high, which in turn leads to heating and leaks (Figure II).

Furthermore, they are unfavorable for assembly and maintenance because they are closed from below (Figure II).

My new development eliminates the disadvantages mentioned:

The integrated lubrication chamber ensures that steel parts and seals are continuously lubricated, reducing friction and thus also the build-up of temperature and gas pressure (Figure III (I)).

By almost completely drilling out the plunger (Drawing III (2) ) and drilling out the screw cap (Drawing III (4) ), additional filling space is created inside the tool spring (Drawing III (3) ).

This additional filling space avoids high compression and temperature build-up.

The screw cap (Drawing III (4)) makes assembly and maintenance easier than with a cylinder closed at the bottom.

Production entails significant costs.

Claims (3)

1U7Gi fgang K a t &zgr; Niedereschacher Str. 7735 Dauc hangen —t j^rnspruch 1.) Tool spring filled with nitrogen gas , characterized in that a lubrication chamber is integrated. 2.) According to claim 1.), that the almost drilled plunger and the drilled screw cap provide additional gas filling space. 3.) According to claim 1.), that a screw cover for assembly and maintenance is attached. Dauchingen, 15.03.1990 signed: