DE10243660B4 - Use of an injection pump - Google Patents

Abstract

use a commercial injection pump (5, 12) for building up a fluid pressure in front of a nozzle (2) a device for cutting workpieces (1).

Description

The The invention relates to the use of a commercially available injection pump.

An injection pump is for example from the EP 0 925 443 B1 known. It is a piston pump, in particular a radial piston pump of roller tappet type for high-pressure fuel supply in fuel injection systems of internal combustion engines.

Furthermore, for example, from the DE 200 14 024 U1 known to cut workpieces by means of a liquid jet, in particular by means of water. For this purpose, the liquid is brought to a high pressure, the pressure today is about 3000 bar. This liquid is forced out by the pressure from a nozzle with a very small diameter of, for example, about 0.15 mm. The exit velocity of such a liquid jet is about 700 m / s. When hitting the workpiece after a relatively short distance, the liquid penetrates into a hard material, such as steel, stone or the like, due to the kinetic energy present in it, so that the resulting workpiece is cut.

Especially expensive in such waterjet cutting systems is the high pressure pump, by means of which the liquid to the desired high pressure of 3000 bar and above is brought. Many workpieces exist However, from a material that also with a much lower Pressure can be cut. For example. is enough for cutting leather or Plastic a pressure of 1400 to 1700 bar. In these cases are oversized the known high-pressure pumps.

Of the The present invention is based on the object for an injection pump the o.g. To provide a new use.

solution

to solution performs this task, that the injection pump to build up a fluid pressure in front of a Nozzle one Device for cutting workpieces is used.

Prefers this is a commercially available injection pump, such as she finds use in motor vehicles. Usually it acts These are radial piston pumps and piston pumps, both Species can also be used in the present case. Becomes used a radial piston pump, so this can be connected directly to the nozzle as they themselves are at the liquid can build up a relatively high pressure of about 1400 bar.

Become on the other hand used piston pumps, so it is necessary that between Nozzle and Piston pump an accumulator is interposed. The piston pump builds up the necessary pressure in the accumulator.

Promote this known injection pumps only water as liquid to the nozzle, so there the big danger that the injection pumps seize up. Therefore it has been found advisable to add a lubricant to the fluid to be added, wherein the lubricant is preferably a polymer or a Combination of different polymers can be. With this addition a seizure of the pump is avoided.

Of the By the way, lubricant is increasing at the high exit velocity of the liquid jet from the nozzle, but he has a higher one Dense on, as the liquid. This means that it, split into small particles or droplets, is much more abrasive than the liquid itself the cutting process is accelerated. As a lubricant is preferred a polymer or a combination of different polymers used.

One a particularly great advantage of the use according to the invention is in it see that no control is necessary. All it takes is one and off switch. Both by means of the radial piston pump, as well as by means the piston pump and the downstream pressure accumulator can continuous operation of the device without further Parameters for a control is necessary.

figure description

Further Advantages, features and details of the invention will become apparent the following description of preferred embodiments, and by reference the drawing; this shows in

1 a schematically illustrated side view of parts of an inventive device for cutting materials;

2 a schematically illustrated side view of another embodiment of a device accordingly 1 ,

According to 1 should a workpiece 1 cut by means of a liquid jet or from this workpiece 1 Part will be cut out by means of the liquid jet. The liquid is from a nozzle 2 applied in a fine jet under high pressure.

The nozzle 2 is over a line 3 with an aggregate 4 connected, in which there are elements to build up the required high pressure for the liquid. At the aggregate 4.1 to 1 are injection pumps 5.1 provided, which are designed as piston pumps. This piston pumps 5.1 of which in 1 three are shown is a pressure accumulator 6 assigned, in which a pressure can be built. The accumulator 6 stands with the line 3 in connection.

Every piston pump 5.1 has a connection 7 to a distributor 8th that with a supply line 9 for the fluid communicates.

The operation of the present invention is as follows:
To the workpiece 1 To cut, this is on outriggers 10 on a work table 11 hung up. This work table 11 and together with him also the workpiece 1 is movable in a horizontal plane in the X and Y directions. The control is carried out via a corresponding program, as desired, as the workpiece 1 should be cut.

The cutting process itself is carried out by a liquid, preferably by water, via the supply line 9 and the connections 7 the piston pumps 5.1 is supplied.

Through the activity of the piston pumps 5.1 is in the pressure accumulator 6 a corresponding pressure built up, whereby the piston pumps can build up a pressure of up to 1700 bar.

From the accumulator 6 now passes continuously with high pressure fluid through the line 3 to the nozzle 2 and from the nozzle 2 in a fine beam on the workpiece 1 , whereby this is cut.

The embodiment according to 2 differs from the one after 1 by providing a radial piston pump 12 which also normally serves to inject fuel into the cylinder of a corresponding engine. Because this radial piston pump 12 the liquid continuously under high pressure, for example. With 1400 to 1700 bar, promotes, it needs no downstream pressure accumulator, but can directly with the line 3 to the nozzle 2 be connected. Furthermore, it is directly connected to a port 7 connected to the liquid.

Position Number List

Claims (3)

Use of a commercially available injection pump ( 5 . 12 ) for establishing a fluid pressure in front of a nozzle ( 2 ) a device for cutting workpieces ( 1 ). Use according to claim 1, wherein the liquid is mixed with a lubricant. Use according to claim 2, characterized that the lubricant of a polymer or a combination of different Consists of polymers.