EP1080249A1 - Verfahren zum einbringen mindestens einer nut in eine bohrung - Google Patents
Verfahren zum einbringen mindestens einer nut in eine bohrungInfo
- Publication number
- EP1080249A1 EP1080249A1 EP00916759A EP00916759A EP1080249A1 EP 1080249 A1 EP1080249 A1 EP 1080249A1 EP 00916759 A EP00916759 A EP 00916759A EP 00916759 A EP00916759 A EP 00916759A EP 1080249 A1 EP1080249 A1 EP 1080249A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bore
- exposure
- photosensitive layer
- light source
- light beam
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/02—Local etching
Definitions
- the invention relates to a method for making at least one groove in a bore.
- m cylinder bores of sliding valve control grooves are required that have only small tolerances.
- tolerances of only ⁇ 20 ⁇ m can be achieved, which is not sufficient for applications with fuel injectors.
- the object of the invention is therefore to provide a method by means of which grooves with substantially smaller tolerances m can be drilled.
- a photo-sensitive layer to the inner surface of the bore.
- the photo-sensitive layer can be applied by spraying, dipping or by mechanical application using brushes, brushes or sponges. Liquid photo-sensitive materials such as photoresist are particularly suitable for this. It should be noted that the photosensitive layer is insensitive to subsequent etching processes. If, for example, liquid photo lacquer is applied, a usable photo-sensitive layer is only available after a certain drying time.
- the photo-sensitive layer can then be exposed in accordance with the desired course of the grooves. A suitable exposure Exposed on the photosensitive layer in such a way that, after a development step, etching is possible at the points where the groove or grooves are later to come to rest.
- the exposure patterns are to be adapted to the given photosensitive layer in such a way that the exposed areas of a photo-positive layer and the unexposed areas of a photonegative layer are developed and the areas below are exposed.
- an etchant is introduced into the bore.
- the etchant is left in the borehole for a certain period of time and then removed from the borehole, for example by dumping or by suction.
- the depth of the groove depends on the strength of the etchant as well as the length of time it remains in the hole. Since the photosensitive layer is insensitive to the etchant, only the
- the inner surfaces of the bore are preferably surface-treated.
- the etched areas can be deepened by mechanical grinding or milling after etching. The latter can be done immediately after removing the etchant or after removing the remaining photosensitive layer.
- the exposure can either be by means of a light source generating a light beam in connection with at least one rotating mirror deflecting the light beam, displaceable in the bore, or by means of a light source which is accommodated in a transparent inner cylinder with shading elements producing exposure pattern, or by means of a rotatable and displaceable point light source which generates the light sound and is introduced into the bore.
- the optical waveguide in particular a tapering end can be provided at which the light beam is deflected laterally.
- the optical waveguide can also have an axial radiation characteristic and be kinked in the bore.
- the light source can be switched on or off depending on the position of the optical waveguide to generate an exposure pattern.
- FIG. 1 shows a general embodiment of a method according to the invention, including an exposure step
- FIG. 2 shows a first embodiment of the exposure step
- FIG. 3 shows a second embodiment of the exposure step
- FIG. 4 shows a third embodiment of the exposure step
- FIG. 5 shows a fourth embodiment of the exposure step
- FIG. 6 shows a fifth embodiment of the exposure step
- FIG. 7 shows a sixth embodiment of the exposure step
- FIG 8 shows a seventh embodiment of the exposure step.
- a bore 1 is made in a solid, for example a valve housing 2.
- the inner surface 3 of the bore 1 is, for example surface-treated by grinding, then polishing and finally anodizing. The result of this process step is shown in Figure la.
- a photosensitive layer 4 is applied to the surface-treated inside 3 of the bore 1. This is done, for example, by spraying liquid, photo-sensitive lacquer onto the inner wall 3 of the bore 1.
- the lacquer contains solvents which evaporate during the drying process. After drying, the lacquer forms a hardened, photosensitive layer that is resistant to acids, but can be removed by solvents. The result of this process step is shown in FIG. 1b.
- a light beam 6 generated by a light source 5 is directed by appropriate light guiding means 7 (for example a mirror etc.) to the desired location and thus an exposure pattern 8 consisting of exposed and unexposed locations on the photosensitive layer 4 is generated.
- appropriate light guiding means 7 for example a mirror etc.
- the next step is the development of the photosensitive layer 3 and the etching of the grooves.
- an inlet 9 is placed on one side of the bore 1 and an outlet 10 on the other side of the bore 1, each with the same cross section as the bore 1, is attached to the valve housing 2 using sealing rings 11.
- the hole 1 is determined with a developer liquid (eg strong lye) for a enough time to develop the photosensitive layer 3.
- the hole is flushed through in the same way with an etchant (strong acid) for a certain time. The length of time depends on how deep you want to etch.
- a solvent is spooled in to detach and remove the various layers of lacquer.
- the bore 1 is cleaned, for example, with a detergent.
- FIG. 1d shows the state before the solvent is introduced.
- the grooves 12 are deepened by grinding (or alternatively by milling) at a tolerance-safe distance from the etched groove edges - forming depressions 13.
- Figure le shows the state after deepening.
- the exposure takes place by means of a rod-shaped light source 14 which is introduced into the bore 1 and which is surrounded by a transparent cylinder 15.
- Shading 16 is applied to the outside of the transparent cylinder 15, which together with the unshaded areas of the transparent inner cylinder 15 result in an exposure pattern 8.
- a photo negative varnish is used as the photosensitive layer 4, so that the shadows 16 identify the places at which a groove is to be etched later. at Using a photo positive varnish, however, these areas were not shaded.
- the transparent cylinder 15 contains formations 17 which serve as a stop when imported into the bore 1. This enables the exact position of the exposure pattern to be set reproducibly.
- the light source 14 is switched on for a certain period of time which is sufficient for the exposure of the photosensitive layer 4. After switching off the light source 14, the light source 14 and the transparent cylinder 15 are pulled out of the bore 1 again.
- a light beam 19 is generated, for example, by a laser unit 18 and the bore 1 is guided parallel to the longitudinal axis of the bore 1 m.
- a shaft 20 is inserted, at the end of the bore 1 in which a mirror 21 is arranged at 45 ° to the longitudinal axis of the bore 1.
- the shaft 20 is rotatable so that an illuminated ring enclosing the inner surface of the bore 1 is produced when the shaft 20 rotates.
- an angle of 45 ° other angles can also be used, but an angle of 45 ° results in a more homogeneous illumination than other angles.
- the shaft 20 can be provided with means not shown in the drawing for remote adjustment of the position.
- the embodiment of Figure 4 has been modified so that three individual mirrors 22 are provided instead of a single mirror.
- the three mirrors 22 are cast in a crystal-clear, zylmderforangen synthetic resin body (cylinder 23) each offset at an angle of 45 ° to the longitudinal axis and in the axial and radial directions.
- the cylinder 23 is inserted from one side m of the bore 1, while from the other side a light beam 19 of the width of the bore 1 is directed at the bore 1.
- the cylinder 23 does not have to be axially displaced in the bore 1 like the shaft 20 from FIG. 3 in order to carry out exposures for several grooves at different locations with high accuracy.
- the embodiment from FIG. 5 has been modified from the embodiment according to FIG. 3 in such a way that a shaft 24 at its end located in the bore 1 has a truncated cone 25 with mirrored lateral surfaces instead of a plane mirror 21 as in FIG.
- the jacket surfaces have an angle of 45 ° to the longitudinal axis of the bore 1.
- a light beam 19 generated by the light source 18 is deflected on the lateral surfaces of the truncated cone 25 by 90 ° m in the direction of the inner surface of the bore 1 and generates the exposure pattern 8 there.
- a point light source 26 m is introduced into the bore 1.
- the point light source 26 can be provided, for example, by a miniature incandescent lamp or an emitting diode and can have diaphragms 27 and 28 for sharply delimiting the exposure field.
- the diaphragms 27 and 28 are perpendicular to the inner surface of the bore 1 and perpendicular to the longitudinal axis of the bore 1.
- the point light source 26 is connected to a power supply 31 via a feed line 29 and a switch 30.
- the point light source is consequently introduced into the bore 1, brought into the appropriate position and made to light up by means of the switch 30.
- Various apparatuses can be used to position the point light source 26, which are rigidly connected, for example, to the point light source 26 and which, for example, enclose the feed line 29.
- the light from a light source 32 is directed onto the sections of the inner wall of the inner surface of the inner surface of the inner surface by means of a light guide 33 which is bent at right angles to the bore 1 Drilled hole 1.
- a light guide 33 which is bent at right angles to the bore 1 Drilled hole 1.
- a radially circumferential exposure pattern can be achieved in the bore, while by moving the light guide 33 an axial pattern can be generated in the longitudinal direction.
- an optical waveguide is formed at its end located in the bore 1 such that the end has a truncated cone-shaped recess 37.
- the recess 37 has in its jacket surface adjacent to the light guide 33 an angle of 45 ° to the longitudinal axis of the bore 1.
- the light generated by a light source 34 is guided by means of the light guide 35 as a light beam 36 onto the recess 37 and from there projected onto the inner surface of the bore 1 at a right angle to the longitudinal axis.
- the outer surface of the recess 37 can be mirrored if necessary.
- Exposure patterns 8 are in turn generated on the photosensitive 4 layer of the bore 1 by the deflected light.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19907927 | 1999-02-24 | ||
DE19907927 | 1999-02-24 | ||
PCT/DE2000/000519 WO2000050665A1 (de) | 1999-02-24 | 2000-02-24 | Verfahren zum einbringen mindestens einer nut in eine bohrung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1080249A1 true EP1080249A1 (de) | 2001-03-07 |
EP1080249B1 EP1080249B1 (de) | 2003-09-03 |
Family
ID=7898678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00916759A Expired - Lifetime EP1080249B1 (de) | 1999-02-24 | 2000-02-24 | Verfahren zum einbringen mindestens einer nut in eine bohrung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1080249B1 (de) |
DE (1) | DE50003510D1 (de) |
WO (1) | WO2000050665A1 (de) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3751313A (en) * | 1971-08-23 | 1973-08-07 | Us Army | Method of forming rifling in a gun barrel by chemical milling |
SU1082863A1 (ru) * | 1980-07-22 | 1984-03-30 | Витебский технологический институт легкой промышленности | Способ химического фрезеровани деталей |
EP0596110A1 (de) * | 1990-04-25 | 1994-05-11 | Kabushiki Kaisha Komatsu Seisakusho | Verfahren zur behandlung von kohren |
US5855802A (en) * | 1996-05-30 | 1999-01-05 | International Business Machines Corporation | Method and apparatus for forming a tubular article having a perforated annular wall |
-
2000
- 2000-02-24 WO PCT/DE2000/000519 patent/WO2000050665A1/de active IP Right Grant
- 2000-02-24 DE DE50003510T patent/DE50003510D1/de not_active Expired - Fee Related
- 2000-02-24 EP EP00916759A patent/EP1080249B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0050665A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50003510D1 (de) | 2003-10-09 |
EP1080249B1 (de) | 2003-09-03 |
WO2000050665A1 (de) | 2000-08-31 |
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