WO2003082503A2 - Procede et dispositif pour usiner une piece - Google Patents

Procede et dispositif pour usiner une piece Download PDF

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Publication number
WO2003082503A2
WO2003082503A2 PCT/DE2003/000978 DE0300978W WO03082503A2 WO 2003082503 A2 WO2003082503 A2 WO 2003082503A2 DE 0300978 W DE0300978 W DE 0300978W WO 03082503 A2 WO03082503 A2 WO 03082503A2
Authority
WO
WIPO (PCT)
Prior art keywords
flow channel
processing
workpiece
flow
mass flow
Prior art date
Application number
PCT/DE2003/000978
Other languages
German (de)
English (en)
Other versions
WO2003082503A3 (fr
Inventor
Gerhard Moeckl
Martin Etzel
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2003082503A2 publication Critical patent/WO2003082503A2/fr
Publication of WO2003082503A3 publication Critical patent/WO2003082503A3/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects
    • B23H9/14—Making holes
    • B23H9/16—Making holes using an electrolytic jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
    • B23H9/00—Machining specially adapted for treating particular metal objects or for obtaining special effects or results on metal objects

Definitions

  • the invention is based on a method and a device for producing a workpiece according to the preamble of the independent claims.
  • a method for machining a workpiece in which the workpiece has a first flow channel and a second flow channel, the second flow channel opening into the first flow channel.
  • a depression is worked in around the mouth of the second flow channel into the first flow channel by means of electroerosive machining. This lowering may be necessary so that the turns of a spring arranged in the first flow channel do not block the second flow channel.
  • the surface of the countersink is very rough due to the electrical discharge machining.
  • the edge that is formed by the depression and the second flow channel is very different from workpiece to workpiece.
  • the amount of a medium flowing through in later use can be quite different at a given pressure from workpiece to workpiece.
  • several methods and devices are known.
  • Dynamic measurement means that the flow resistance is measured during processing, for example when material is removed from the wall or the edge of the flow channel. The flow resistance is measured, for example, via the
  • Measurement of the displacement of a piston whose surface is known This allows the volume to be determined that flows through the flow channel. In other words, the volume flow is measured. Furthermore, the flow resistance can also be determined by measuring the speed of the electrolyte solution in the flow channel. As soon as a predetermined value of the volume flow or the speed of the electrolyte solution is reached, the processing is ended.
  • volume flow is also measured according to this document.
  • Temperature has a strong influence on the result. That a higher volume flow is measured at high temperatures than at lower temperatures.
  • the mass flow of the electrolyte solution flowing through the at least one flow channel is measured, and at the same time a reduction is incorporated and the processing is carried out until a predetermined mass flow is reached.
  • the measurement of the mass flow becomes more precise when it takes place during processing pauses, the measurement in the respective processing pause only beginning after the mass flow has settled down.
  • the device has a device for measuring the mass flow of the working fluid through the at least one flow channel.
  • the device is a mass flow meter that works according to the Coriolis principle.
  • the device has a simple structure when a piston diaphragm pump passes the working fluid through the pumps at least one flow channel. This reduces pressure fluctuations during the measurement.
  • pulsation dampers can be arranged to smooth out pressure fluctuations.
  • FIG. 1 shows a device for electrochemical processing
  • Figure 2 shows a spring holder in section before the electrochemical
  • FIG. 3 shows a spring holder in section after the electrochemical processing.
  • a device 10 for electrochemical machining of a workpiece 12 is shown schematically in FIG.
  • the principle of the electrochemical method is based on the fact that on two electrodes, which are in one
  • a DC voltage is applied.
  • the workpiece 12 to be treated is connected to the positive pole (anode) of the power source with the aid of a transmission element, while an electrode serving as a tool is connected to the negative pole (cathode) of the power source due to its electrically conductive properties.
  • the composition of the electrolyte solution depends on the material of the component to be machined. For metals such. B. a saline solution or a sodium nitrate solution is selected. The electrochemical process itself is known from physics and is therefore not explained in more detail here. In addition to the composition of the electrolyte solution, the method of operation also depends on the current intensity used, which in turn is to be matched to the material of the workpiece 12 to be machined.
  • the workpiece 12 is designed as a spring holder of an injection nozzle. This is a cylindrical part with a central blind bore 14 and an outlet bore 16 branching therefrom for excess fuel that is not injected into the combustion chamber of the internal combustion engine during the combustion process. Instead of one, there may also be more outlet bores.
  • a spring not shown, is supported.
  • a workpiece 12 designed as a spring holder it can also be a part of an injection nozzle other than the front part reaching into the combustion chamber.
  • a bore similar to the blind bore 14 from which usually several injection bores branch off similar to the drain bore 16.
  • the drain hole 16 or the injection holes are flow channels which can be processed electrochemically with the device 10.
  • the device 10 comprises a tank 18, a pump 20, pulsation damper 22, a pressure meter 24 Safety valve 26, a mass flow meter 28, an electrode 30 and a generator 32 for voltage and power supply.
  • the components mentioned are connected to a PLC (programmable logic controller, abbreviated to PLC), which is known and is known per se and with which the device 10 can be operated.
  • PLC programmable logic controller
  • the pump 20 pumps the electrolyte solution required for the electrochemical processing from the tank 18 via a line 34 into a line 36.
  • the line 36 leads to the workpiece 12.
  • the electrolyte solution is through the
  • the pump 20 is a single-stage or multi-stage piston diaphragm pump. Piston diaphragm pumps are characterized by particularly low pressure fluctuations.
  • pulsation dampers 22 are provided on line 36 for smoothing pressure fluctuations. However, if the pressure fluctuations generated by the pump 20 are within permissible limits, the pulsation dampers 22 can also be omitted.
  • the pressure of the electrolyte solution is recorded and passed on to a controller (not shown) for evaluation.
  • the pressure can also be processed in a control system that regulates the pressure in the system based on process instructions.
  • the safety valve 26, which is also connected to the line 36, is required in the event that the pressure control fails and an overpressure arises in the system. In this case, the safety valve 26 opens automatically and allows the electrolyte solution, which is under high pressure, to flow away.
  • the mass flow meter 28 is based on the effect of the physical magnitude of the Coriolis force.
  • the Coriolis force is an apparent force that acts on moving masses in a rotating reference system.
  • the medium to be recorded is therefore directed into a pipeline that is set in vibration.
  • the Coriolis force that arises influences the deflection of the pipe. This deflection is detected by sensors. Phase shifts of the sensor signals represent a quantity proportional to the actual mass flow.
  • There are single and two-pipe systems as well as various geometrical shapes of the pipeline such as a straight pipe, a pipe in zigzag shape, in loops etc.
  • Conductivity is. It is even easy to determine the density and temperature of a mass. Furthermore, in the field of fuel injection technology, it is not the volume but the injected mass that is decisive for the chemical reactions during a combustion process. If you have information about the mass flow, the chemical reactions during the combustion process can be balanced much better and thus optimized.
  • the generator 32 which can be freely programmed via the PLC, not shown, is used for the voltage and power supply.
  • the electrode 30 and the workpiece 12 are connected to the generator 32. The current necessary for material removal flows through the electrode 30, the electrolyte solution and the workpiece 12.
  • the structure of the electrode 30 can be seen more clearly in the sectional illustration in FIG.
  • the electrode 30 comprises a copper tube 38 which is surrounded by an insulation 40.
  • the copper pipe 38 is exposed and has a passage 42 in the form of a bore.
  • the electrolyte solution can flow through the copper pipe 38, the passage 42 and through the outlet bore 16.
  • the point on the electrode at which the copper tube 38 is exposed is the effective electrode surface 44.
  • the effective electrode surface 44 is significantly involved in the size of the machining surface on the workpiece 12.
  • the region of the blind hole 14, which is located around the outlet bore 16, is removed. This produces a depression or a pocket 46.
  • the pocket 46 is necessary so that the spring, not shown, which is already mentioned and which is supported on the bottom of the blind hole 14, cannot block the outlet hole 16.
  • Outlet bore 16 is measured and the electrochemical processing is carried out until a predetermined mass flow is reached.
  • the mass flow of the electrolyte solution must only be converted via the density ratios with the required mass flow of a fuel. This ensures that the desired mass flow is always achieved through the outlet bore 16 at the end by machining at a predetermined pressure. What is important for the change in the mass flow is the change in the edge formed by the depression or the pocket 46 and the outlet bore 16. The longer the machining takes, the larger the radius and the larger the mass flow.
  • the change in mass flow over time was asymptotic overall and approached a value essentially determined by the narrowest point of the outlet bore 16. This value would remain essentially constant until the electrochemical processing has progressed to such an extent that the diameter of the outlet bore 16 increases again.
  • the process is such that the pump 20 is first switched on.
  • the electrolyte solution is pumped through lines 34, 36 to workpiece 12 and through bores 14, 16.
  • the electrode 30 and the workpiece 12 form a working gap through which the electrolyte solution is pumped.
  • the generator 32 is switched on. Material flows away at the edge of the outlet bore 16 due to the current flow and is flushed away by the electrolyte solution.
  • the pocket 46 is worked in around the edge of the outlet bore 16.
  • the pocket 46 is usually incorporated using the electroerosion method, which means that mass flow calibration is not possible. Machining using electroerosion is relatively imprecise. Due to the electrochemical material processing, the accuracy of the processing is now increased and two operations are combined into one operation. Material is simultaneously removed from the edge of the outlet bore 16 and the depression or pocket 46 until the predetermined mass flow of the electrolyte solution used for electrochemical material processing is reached through the outlet bore 16. It is important that the voltage of the generator 32 is set such that the pocket 46 is not too flat or too deep when the desired mass flow is reached.
  • the generator 32 is switched off after a first predetermined time. That is, in order to obtain more accurate results, a dynamic measurement that cannot be falsified by gas bubble formation is carried out, but a static measurement. Therefore, the
  • Measurement of the mass flow during processing breaks whereby the measurement in the respective processing break only begins after the mass flow has settled down.
  • This calming time ranges from a few tenths of a second to a few seconds. If the mass flow is reached at a predetermined pressure, the processing is ended. If the desired mass flow has not yet been reached, a further processing phase follows, after which there is also a processing pause with a calming phase and a measuring phase. The processes are repeated until the desired mass flow is achieved.
  • the electrolyte solution can be pumped at a lower pressure during the machining phases than during the
  • the pressure can be, for example, 10 bar and in the processing pauses or measuring phases, 80 bar.
  • the parts produced using this method can easily be recognized by the fact that the pocket 46 and the edge formed by the depression 46 and the second flow channel 16 have a very smooth surface. This surface is considerably smoother than a pocket 46 produced by means of electro-erosion.
  • the surface of the pocket is also generally smoother than the surface of the blind hole 14 produced by turning.

Abstract

L'invention concerne un procédé et un dispositif pour usiner une pièce (12) pourvue d'un premier canal d'écoulement (14) et d'un deuxième canal d'écoulement (16), le deuxième canal d'écoulement (16) débouchant dans le premier (14). Autour de l'embouchure du deuxième canal d'écoulement (16) dans le premier (14) est façonnée une dépression (46) par l'application d'un procédé d'usinage électrochimique. Simultanément, de la matière est enlevée du bord formé par la dépression (46) et par le deuxième canal d'écoulement (16) jusqu'à l'obtention d'un flux massique prédéfini de la solution électrolytique traversant le deuxième canal d'écoulement (16) dans le cadre procédé d'usinage électrochimique.
PCT/DE2003/000978 2002-04-03 2003-03-25 Procede et dispositif pour usiner une piece WO2003082503A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10214617.9 2002-04-03
DE2002114617 DE10214617A1 (de) 2002-04-03 2002-04-03 Verfahren und Vorrichtung zur Bearbeitung eines Werkstücks

Publications (2)

Publication Number Publication Date
WO2003082503A2 true WO2003082503A2 (fr) 2003-10-09
WO2003082503A3 WO2003082503A3 (fr) 2003-12-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2003/000978 WO2003082503A2 (fr) 2002-04-03 2003-03-25 Procede et dispositif pour usiner une piece

Country Status (2)

Country Link
DE (1) DE10214617A1 (fr)
WO (1) WO2003082503A2 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865977A (en) * 1994-10-21 1999-02-02 Frembgen; Fritz-Herbert Process for the electrochemical treatment of flow channels in metal workpieces
EP1179379A1 (fr) * 2000-08-09 2002-02-13 Delphi Technologies, Inc. Méthode d'usinage électrochimique d'orifices

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5865977A (en) * 1994-10-21 1999-02-02 Frembgen; Fritz-Herbert Process for the electrochemical treatment of flow channels in metal workpieces
EP1179379A1 (fr) * 2000-08-09 2002-02-13 Delphi Technologies, Inc. Méthode d'usinage électrochimique d'orifices

Also Published As

Publication number Publication date
DE10214617A1 (de) 2003-10-16
WO2003082503A3 (fr) 2003-12-04

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