Piezoelectric Injector for Direct Fuel Injection

Patent metadata

Field	Value
Publication number	US-2016311043-A1
Application number	US-201415101973-A
Country	US
Kind code	A1
Filing date	Dec 3, 2014
Priority date	Dec 5, 2013
Publication date	Oct 27, 2016
Grant date	—

Abstract

The invention relates to a method and to a device for producing a nozzle body, in which a nozzle-body blank is processed by means of an electro-chemical processing procedure. A method for producing a nozzle body, may include: preparing a nozzle-body blank which has a central axis and a first and a second axial end; proceeding from the first axial end, incorporating a blank cavity into the nozzle-body blank, producing a blank wall between the blank cavity and an external region of the nozzle-body blank; adapting, by means of an electro-chemical processing procedure which comprises electro-chemical subtraction, at least part of a contour of the blank wall, thereby producing a wall of a cavity of the nozzle body.

First claim

What is claimed is:

1 . A method for producing a nozzle body, the method comprising:
preparing a nozzle-body blank which has a central axis and in a first and a second axial end; proceeding from the first axial end, incorporating a blank cavity into the nozzle-body blank, producing a blank wall between the blank cavity and an external region of the nozzle-body blank; adapting, by means of an electro-chemical processing procedure which comprises electro-chemical subtraction, at least part of a contour of the blank wall, thereby producing a wall of a cavity of the nozzle body.

2 . The method as claimed in claim 1 , wherein the electro-chemical processing procedure comprises:
providing an electrolyte and a cathode; inserting the cathode into the blank cavity; placing the electrolyte into at least one part-region of the remaining vacant volume of the blank cavity; and applying a predefined voltage profile between the cathode and the nozzle-body blank.

3 . The method as claimed in claim 2 , wherein the predefined voltage profile comprises a pulsed voltage profile.

4 . The method as claimed in claim 1 , wherein during the electro-chemical processing procedure part of the contour of the blank wall is adapted to produce a blind hole.

5 . The method as claimed in claim 1 , wherein during the electro-chemical processing procedure part of the contour of the blank wall is adapted to produce a seat region for a nozzle needle.

6 . The method as claimed in claim 1 , wherein during the electro-chemical processing procedure part of the contour of the blank wall is adapted to produce a guide region for guiding a nozzle needle.

7 . The method as claimed in claim 2 , wherein the cathode includes a non-conducting component supporting the cathode on the nozzle-body blank during the electro-chemical processing procedure.

8 . The method as claimed in claim 7 , wherein the cathode has a cathode cavity extending along the central axis; and
during the electro-chemical processing procedure the electrolyte is placed through the cathode cavity into at least a part-region of the remaining vacant volume of the blank cavity.

9 . The method as claimed in claim 2 , further comprising rotating or oscillating the cathode during the electro-chemical processing procedure.

10 . The method as claimed claim 1 , wherein prior to the electro-chemical processing procedure:
preparing a nozzle-body blank includes tempering the blank, and at least part of the contour of the blank wall is abraded by means of an abrasive process within the blank cavity.

11 . The method as claimed in claim 10 , wherein:
the cathode includes a non-conducting component supporting the cathode on the nozzle-body blank during the electro-chemical processing procedure; the cathode is disposed in an axially extending component cavity of the non-conducting component so as to be axially movable in relation to the central axis; and the non-conducting component has a seat; during an abrasive process part of the contour of the blank wall is adapted to form a seat region for a nozzle needle is configured; and during the electro-chemical processing procedure the seat of the non-conducting component is brought to bear on the seat region, and the cathode is guided within the component cavity of the non-conducting component such that part of the contour of the blank wall is adapted to form a blind hole.

11 . The method as claimed in claim 4 , further comprising forming at least one injection bore which penetrates the blank wall of the nozzle-body blank from the blank cavity into the external region of the nozzle-body blank in the region of the blind hole and/or of the seat region prior to the electro-chemical processing procedure.

12 . A device for processing a workpiece, the device comprising:
an electrode with a central axis; and a non-conducting component with an axially extending component cavity; wherein the electrode is disposed at least partially within the component cavity and axially movable therein; and the electrode is guided within the component cavity during a processing procedure.

13 . The device as claimed in claim 12 , wherein the non-conducting component includes a seat; and
the workpiece to be processed rests on the seat during processing procedure.

15 . The device as claimed in claim 12 , wherein the non-conducting component includes a stop for the electrode.

Assignees

• Continental Automotive Gmbh

Inventors

• Garn Rüdiger
• Hofmann Thomas
• Simmet Martin
• Austel Thomas

Classifications

• F02M2200/80

  Fuel injection apparatus manufacture, repair or assembly · CPC title

• C25F3/14

  locally · CPC title

• B23H9/14 Primary

  Making holes · CPC title

• B23H2300/10

  Pulsed electrochemical machining · CPC title

• B23H3/04

  Electrodes specially adapted therefor or their manufacture (B23H9/00 takes precedence) · CPC title