DE9317921U1 - Particle jet nozzle - Google Patents
Particle jet nozzleInfo
- Publication number
- DE9317921U1 DE9317921U1 DE9317921U DE9317921U DE9317921U1 DE 9317921 U1 DE9317921 U1 DE 9317921U1 DE 9317921 U DE9317921 U DE 9317921U DE 9317921 U DE9317921 U DE 9317921U DE 9317921 U1 DE9317921 U1 DE 9317921U1
- Authority
- DE
- Germany
- Prior art keywords
- particles
- jet nozzle
- discharging
- particle jet
- particle 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.)
- Expired - Lifetime
Links
- 239000002245 particle Substances 0.000 title claims description 18
- 238000007599 discharging Methods 0.000 claims description 5
- 239000002344 surface layer Substances 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/02—Carrying-off electrostatic charges by means of earthing connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/32—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks
- B24C3/322—Abrasive blasting machines or devices; Plants designed for abrasive blasting of particular work, e.g. the internal surfaces of cylinder blocks for electrical components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C5/00—Devices or accessories for generating abrasive blasts
- B24C5/02—Blast guns, e.g. for generating high velocity abrasive fluid jets for cutting materials
- B24C5/04—Nozzles therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C7/00—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
- H05K3/288—Removal of non-metallic coatings, e.g. for repairing
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/025—Abrading, e.g. grinding or sand blasting
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
- H05K2203/0756—Uses of liquids, e.g. rinsing, coating, dissolving
- H05K2203/0769—Dissolving insulating materials, e.g. coatings, not used for developing resist after exposure
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Glanulating (AREA)
- Disintegrating Or Milling (AREA)
Description
93&THgr; 3 6 3 4OE93Θ 3 6 3 4OE
Siemens AktiengesellschaftSiemens AG
Teilchenstrahldüse
5Particle beam nozzle
5
Die Erfindung bezieht sich auf eine Teilchenstrahldüse zur Entfernung von Oberflächenschichten von bestückten elektronischen Baugruppen.The invention relates to a particle beam nozzle for removing surface layers from assembled electronic assemblies.
Es ist beispielsweise bei Reparaturmaßnahmen notwendig, daß von elektronischen Flachbaugruppen (FBG), die Lackbeschichtung partiell entfernt wird. Dazu ist die Benutzung von Strahldüsen bereits bekannt. Nachteilig ist es dabei jedoch, daß die Teilchen im Zuführschlauch aufgeladen werden und elektrische Ladung auf die Flachbaugruppen übertragen. Das kann zu Spitzenspannungen von etwa 4 kV führen. Solche Spitzenspannungen können dann empfindliche elektronischen Bauelementen zerstören.For example, during repair work it is necessary to partially remove the paint coating from electronic printed circuit boards (PCBs). The use of jet nozzles is already known for this purpose. The disadvantage of this, however, is that the particles in the feed hose are charged and transfer electrical charge to the PCBs. This can lead to peak voltages of around 4 kV. Such peak voltages can then destroy sensitive electronic components.
Aufgabe der Erfindung ist es, ein Verfahren zum Entfernen von Oberflächenschichten zu entwickeln, das keine schädlichen Auflasdungen bewirkt.The object of the invention is to develop a method for removing surface layers that does not cause harmful charges.
Gemäß der Erfindung wird diese Aufgabe dadurch gelöst, daß am Düsenaustritt eine Vorrichtung zur elektrischen Entladung der Teilchen vorgesehen ist, so daß auf die Baugruppe eben keine unzulässigen Spitzenspannungen übertragen werden.According to the invention, this object is achieved in that a device for electrically discharging the particles is provided at the nozzle outlet, so that no inadmissible peak voltages are transmitted to the assembly.
Diese Abladung des Teilchenstrahls erfolgt dabei zweckmäßigerweise durch die Beförderung dieses Strahls durch ein geerdetes Drahtgeflecht, Maschengewebe oder Gitter.This discharge of the particle beam is conveniently carried out by transporting this beam through a grounded wire mesh, mesh or grid.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher erläutert. 35An embodiment of the invention is shown in the drawing and is explained in more detail below. 35
Wenn von einer elektronischen Baugruppe 1 die Leiterplattenlackierung entfernt werden soll, beispielsweise dann, wennIf the circuit board coating is to be removed from an electronic assembly 1, for example if
93 G 36 3^OE93 G 36 3^OE
die elektronischen Bauelemente unter anderem das elektronische Bauelement 7 ersetzt werden soll, kann dies dadurch erfolgen, daß ein Teilchenstrahl 2 mit Druckluft oder einem anderen Fördermedium auf die lackierte Oberfläche gespritzt wird. Dazu werden die Teilchen durch einen Zuführschlauch 4 geführt, gelangen dann in eine Düse 3 und werden von dieser zerstäubt. Die Teilchen können sich während dieses Transportes jedoch ohne weitere Maßnahmen auf hohe elektrische Spannungen aufladen und können dann diese Spannungen so auf die Baugruppe 1 übertragen, daß dort empfindliche elektronische Bauelemente zerstört werden können. Daher wird gemäß der Erfindung für eine Ableitung von schädlichen Spannungen gesorgt, indem im Bereich des Teilchenstrahls ein geerdetes Drahtgefeicht 5 vorgesehen ist. Dieses Drahtgeflecht, das beispielsweise auch aus mehreren Bündeln bestehen kann, führt dann über Erdungsleitungen, von denen in der Darstellung nur die Erdungsleitung 6 bezeichnet ist, an Masse. Ferner ist es zweckmäßig, daß auch der Zuführschlauch 4 mit einem Drahtgeflecht 8 versehen ist, damit auch hier für eine Spannungs-0 ableitung gesorgt ist.If the electronic components, including the electronic component 7, are to be replaced, this can be done by spraying a particle beam 2 onto the painted surface using compressed air or another conveying medium. To do this, the particles are fed through a feed hose 4, then enter a nozzle 3 and are atomized by it. However, the particles can charge up to high electrical voltages during this transport without any further measures and can then transfer these voltages to the assembly 1 in such a way that sensitive electronic components can be destroyed there. Therefore, according to the invention, harmful voltages are dissipated by providing a grounded wire mesh 5 in the area of the particle beam. This wire mesh, which can also consist of several bundles, for example, is then connected to ground via grounding lines, of which only the grounding line 6 is shown in the illustration. Furthermore, it is practical that the supply hose 4 is also provided with a wire mesh 8 so that voltage-0 dissipation is also ensured here.
Anstatt des Drahtgeflechtes 5 wäre es jedoch auch möglich, Maschengewebe oder Gitter zu verwenden.Instead of the wire mesh 5, it would also be possible to use mesh fabric or grid.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9317921U DE9317921U1 (en) | 1993-11-23 | 1993-11-23 | Particle jet nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9317921U DE9317921U1 (en) | 1993-11-23 | 1993-11-23 | Particle jet nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE9317921U1 true DE9317921U1 (en) | 1994-01-20 |
Family
ID=6901050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE9317921U Expired - Lifetime DE9317921U1 (en) | 1993-11-23 | 1993-11-23 | Particle jet nozzle |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE9317921U1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3096591A1 (en) * | 2015-05-22 | 2016-11-23 | GP Anlagenbau GmbH | Method and device for reducing an electrostatic charge during the machining, joining or coating of areas using vacuum suction blasting |
-
1993
- 1993-11-23 DE DE9317921U patent/DE9317921U1/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3096591A1 (en) * | 2015-05-22 | 2016-11-23 | GP Anlagenbau GmbH | Method and device for reducing an electrostatic charge during the machining, joining or coating of areas using vacuum suction blasting |
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