EP3532245A1 - Vorrichtung zum abrasiven fluidstrahlschneiden - Google Patents
Vorrichtung zum abrasiven fluidstrahlschneidenInfo
- Publication number
- EP3532245A1 EP3532245A1 EP17787120.9A EP17787120A EP3532245A1 EP 3532245 A1 EP3532245 A1 EP 3532245A1 EP 17787120 A EP17787120 A EP 17787120A EP 3532245 A1 EP3532245 A1 EP 3532245A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle
- control
- pressure fluid
- pressure
- fluid
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 106
- 239000002245 particle Substances 0.000 claims abstract description 30
- 238000007599 discharging Methods 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
- B24C1/045—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass for cutting
-
- 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
- B24C7/0007—Equipment for feeding abrasive material; Controlling the flowability, constitution, or other physical characteristics of abrasive blasts the abrasive material being fed in a liquid carrier
Definitions
- the invention relates to a device for abrasive fluid jet cutting as it is used, for example, to materials by means of a Hochdruckflu- idstrahls, the abrasive particles are mixed to cut or stratify.
- DE 10 2014 222 299 A1 discloses a device in which a fluid, preferably water, is compressed by means of a high-pressure pump and fed to a nozzle which can deliver a high-pressure fluid jet.
- the nozzle is designed so that it can interrupt the high-pressure fluid jet periodically, so that a pulsating high-pressure fluid jet is formed.
- the actual interruption of the high-pressure fluid jet takes place here by means of a movable control piston, which is operated servo-hydraulically, ie is controlled via an alternating pressure in a control chamber.
- the control piston has two end faces, wherein an end face defining the control space is formed larger than the opposite end face of the control piston. If the pressure in the control chamber, which is limited by the larger end face of the control piston, lowered, the control piston moves due to the hydraulic forces in the same, and so releases the connection between a compressor unit and the nozzle, so that a high pressure fluid jet the nozzle exits, with the workpiece can be cut or stripped. When the pressure in the control chamber is increased again, the control piston moves back into its closed position and interrupts the supply of compressed fluid to the nozzle, so also the high-pressure fluid jet is interrupted.
- the device according to the invention for abrasive fluid jet cutting has the advantage that the supply of the abrasive takes place with little effort, so that the abrasive supply can be integrated into the known apparatus without great technical effort.
- the device for abrasive fluid jet cutting has a compressor unit for compressing a fluid, which can be fed to a nozzle in the form of a high-pressure fluid flow, wherein the nozzle is designed to deliver a high-pressure fluid jet.
- an interrupter unit is provided, by means of which the flow of fluid to the nozzle can be interrupted or at least severely throttled, the interrupter unit comprising a control space which can be filled with high-pressure fluid and which can be connected to a drainage space via a control valve.
- the amount of control fluid discharged via the control valve flows via a supply line into a mixing chamber, wherein an abrasive particle leading abrasive channel opens into the supply line so that the quantity of control fluid enriched with abrasive particles mixes with the high-pressure fluid jet.
- the control of the interrupter unit by means of an alternating pressure in a control room makes it necessary that a part of the control room befindl chen high-pressure fluid is deactivated.
- This amount of fluid is used in the present inventive device to introduce the desired abrasive particles in the high-pressure fluid jet by this amount is mixed with the particles introduced into a mixing chamber.
- this makes it possible to make sensible use of the amount of control fluid so that a channel with which this control quantity is conveyed back into the tank can be dispensed with, and on the other hand, the abrasive particles can be metered well and added to the high-pressure fluid jet.
- the supply line is formed so that it opens eccentrically to the high-pressure fluid jet into the mixing chamber. This results in the mixing chamber, a swirl flow, which leads to a better mixing of the control fluid amount, which includes the abrasive particles, with the high-pressure fluid jet.
- the mixing chamber of the nozzle is preferably arranged downstream, so that the abrasive particles after the nozzle the
- High-pressure jet mixed and the abrasive particles does not lead to an excessive burden on the nozzle and thus to a shortened life of the nozzle.
- the abrasive particles are already mixed in the region of the mouth of Abrasivkanals in the feed line with the Steuerfluidmenge, wherein in the feed line only a low pressure prevails, so that the abrasive particles hardly lead to a mechanical impairment of the feed line.
- the interrupter unit comprises a movable control piston which delimits the control space which can be filled with the high-pressure fluid, so that a closing force can be exerted on the control piston by the pressure in the control chamber.
- the movable control piston thus releases or interrupts the connection between the compressor unit and the nozzle, the piston operating according to the known servo-hydraulic principle, which ensures rapid switchability and high reliability.
- the interrupter unit comprises a nozzle needle, which cooperates with a nozzle seat for interrupting the high pressure fluid flow to the nozzle.
- the nozzle needle delimits the control chamber with its end face facing away from the nozzle seat, so that the nozzle nozzle del moved by the changing pressure in the control chamber in the longitudinal direction and thereby interrupts the high pressure fluid flow to the nozzle or releases.
- This hydraulic principle is very similar to that of the control piston and has proven itself for example in the control of the fuel injection in fuel injection valves.
- the control valve is preferably designed as a solenoid valve, which on the one hand ensures high reliability and fast switchability and on the other hand is relatively inexpensive to produce. But it is also possible to provide a piezoelectric valve instead of the solenoid valve, wherein the closing element of the control valve is moved by a piezoelectric actuator.
- FIG. 1 shows a first device according to the invention in a schematic representation
- Figure 2 shows a second embodiment of a device according to the invention
- FIG. 3 shows a detailed view of the mixing chamber in which the abrasive particles are admixed with the high-pressure fluid jet.
- FIG. 1 schematically shows a device according to the invention for abrasive fluid jet cutting.
- the device comprises a compressor unit 1, which comprises a fluid tank 2 and a high-pressure pump 3.
- the high-pressure pump 3 By the high-pressure pump 3, the fluid to be used for fluid jet cutting, compressed and fed via a high-pressure line 4 to an interrupter unit 6.
- the interrupter unit 6 comprises a housing 8 formed in a cavity 8, which is formed as a stepped bore and in des- sen side wall, an annular space 11 is formed. From the annular space 11, a high pressure passage 12 leads to a nozzle 25, through which the compressed fluid is expelled and passes into a mixing chamber 27, which is formed in a collimator 31. Finally, the high-pressure fluid jet 33 exits the collimator 31 and strikes a workpiece 35 which is cut or stripped by the high-pressure fluid jet 33.
- a longitudinally movable control piston 7 is arranged, which is stepped, so that its two end faces have a different diameter and, accordingly, a different area.
- the control piston 7 On the left in Figure 1 front side of the control piston 7, which has a smaller area than the opposite end face, the control piston 7 cooperates with a sealing seat 9, so that when the control piston 7 at the sealing seat 9 a connection of the high-pressure line 4 to the annulus 11 is interrupted.
- With its right in the drawing end face of the control piston 7 limits the control chamber 108, which forms part of the cavity 8.
- the control chamber 108 is hydraulically connected to the high pressure line 4 via a longitudinal bore 10 formed in the control piston 7, so that the control chamber 108 has a connection to the high pressure passage 4.
- a discharge throttle 21 is provided, which connects the control chamber 108 with the discharge space 19, wherein the discharge throttle 21 can be closed or opened by means of a control valve 14.
- the control valve 14 is designed as a solenoid valve and comprises a magnet armature 15 with a sealing ball 17, which closes the outlet throttle 21 when it rests on a sealing seat.
- the armature 15 can be moved by an electromagnet 16 in the longitudinal direction away from the outlet throttle 21, wherein this movement is against the force of an armature spring 18, which is arranged under pressure bias in the drain chamber 19 and the armature 15 and thus the sealing ball 17 in the direction of Outflow throttle 21 applied with a force.
- a supply line 20 leads to the mixing chamber 27, so that fluid diverted from the control space 108 into the discharge chamber 19 is introduced into the mixing chamber. chamber 27 drains off.
- the high-pressure fluid jet 33 mixes with the amount of control fluid so that the fluid jet 33 ultimately emerging from the device contains highly compressed fluid together with abrasive particles.
- This high-pressure fluid jet 33 impinges on a workpiece 35, the angle of impact and pressure depending on whether the high-pressure fluid jet 33 breaks up the workpiece 35 or if the high-pressure fluid jet 33 is capable of stripping the workpiece, for example a paint layer or other coating from the workpiece to remove.
- the compressor unit 1 By the compressor unit 1 is in the high pressure passage 4 high pressure fluid under high pressure.
- the high-pressure fluid is preferably purified water. If the control piston 7 in its closed position in contact with the sealing seat 9, it closes the high-pressure passage 4 with respect to the annular space 11, so that no high-pressure fluid jet 33 emerges from the nozzle 25. About the longitudinal bore 10 also prevails in the control chamber 108, the same high pressure as in the high pressure passage 4, so that the control piston 7 is held in its contact with the sealing seat 9.
- the intermediate space which is formed by the stepped control piston 7, connected via a discharge channel 13 to the drain chamber 19, so that always a significant excess of force by the pressure in the control chamber 108 remains on the control piston 7.
- the control fluid mixed with the particles, so that the mixture of control fluid and abrasive particles enters the mixing chamber 27.
- the fluid mixes with the abrasive particles and the high-pressure fluid jet 33, so that the high-pressure fluid jet 33 ultimately emerging from the device is mixed with abrasive particles, which significantly increases the cutting action on the workpiece 35.
- This makes it possible to cut the workpiece even with a relatively low pressure of, for example, 2000 bar (200 MPa), which is generally required by the pulsating high pressure fluid jet cutting already less high pressure fluid than in continuous water jet cutting.
- Control valve 14 is controlled, can be used by the device described above to introduce the abrasive particles easily and accurately metered into the high-pressure fluid jet. This eliminates the need to promote the repelled fluid amount, for example via another line back into the tank.
- the interrupter unit 6 is realized here in the form of a nozzle 25 with a nozzle needle 28 embedded therein.
- the nozzle needle 28 is arranged longitudinally displaceable in a pressure chamber 26 within the nozzle 25 and takes over the function of the interrupter unit 6, so the function of the control piston 7 in the embodiment of Figure 1.
- the nozzle needle 28 cooperates with a nozzle seat 29, so that when plant on Nozzle seat 29, the connection of the pressure chamber 26 is interrupted to the nozzle opening 30.
- the pressure chamber 26 is thereby through the compressor unit 1 with the high pressure fluid filled via a high-pressure line 4.
- a control chamber 108 is also used here, via which an alternating fluid pressure in the control chamber 108 can be adjusted.
- the control chamber 108 is filled here via a branch of the high-pressure line 4 with fluid and can be relieved of pressure via the outlet throttle 21, also controlled by a control valve 14 shown only schematically.
- this diverted fluid amount is fed via a supply line 20 into a mixing chamber 27, wherein it is previously mixed with the abrasive particles via an abrasive line 22 opening into the feed line 20, as in the embodiment of FIG. 1.
- the mixing chamber 27 is formed in a collimator 31 which receives part of the nozzle 25.
- the amount of control fluid that passes into the mixing chamber 27 via the feed channel 20 mixes with the high-pressure fluid jet 33 in the mixing chamber 27, so that ultimately a high-pressure fluid jet 33 mixed with abrasive particles also emerges here.
- FIG. 3 shows a section through an exemplary embodiment of the mixing chamber 27, which may be provided both in the first and in the second exemplary embodiment.
- the mixing chamber 27 is designed so that the high-pressure fluid jet 33 is perpendicular to the plane of the drawing.
- the feed channel 20 opens into the mixing chamber 27 eccentrically to the high-pressure fluid jet 33, so that a slight swirl flow within the mixing chamber 27 is generated.
- the high-pressure fluid jet 33 effectively mixes with the abrasive particles. These are scavenged out of the device along with the high pressure fluid jet 33.
- the high-pressure fluid is preferably water, but there are also other liquids that can be correspondingly highly compressed, in principle suitable.
- the admixed abrasive particles may be, for example, silicon carbide or silicon oxide, over the number and grain size of the effect can be adjusted.
- the pressures at which the high pressure fluid jet 33 leaves the device are typically 1500 to 2000 bar (150 to 200 MPa), but may be lower, depending on the application. Basically, for a stripping of a workpiece, a lower pressure is sufficient than for a cutting of a workpiece.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Nozzles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016220926.4A DE102016220926A1 (de) | 2016-10-25 | 2016-10-25 | Vorrichtung zum abrasiven Fluidstrahlschneiden |
PCT/EP2017/075117 WO2018077576A1 (de) | 2016-10-25 | 2017-10-04 | Vorrichtung zum abrasiven fluidstrahlschneiden |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3532245A1 true EP3532245A1 (de) | 2019-09-04 |
EP3532245B1 EP3532245B1 (de) | 2020-08-12 |
Family
ID=60143676
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17787120.9A Active EP3532245B1 (de) | 2016-10-25 | 2017-10-04 | Vorrichtung zum abrasiven fluidstrahlschneiden |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3532245B1 (de) |
DE (1) | DE102016220926A1 (de) |
WO (1) | WO2018077576A1 (de) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017205682A1 (de) | 2017-04-04 | 2018-10-04 | Robert Bosch Gmbh | Vorrichtung und Verfahren zum Hochdruck-Fluidstrahlschneiden |
DE102019004685A1 (de) * | 2019-06-28 | 2020-12-31 | Technische Universität Chemnitz | Verfahren zum Materialabtrag an einer Halbzeugoberfläche |
DE102019004686A1 (de) * | 2019-06-28 | 2020-12-31 | Technische Universität Chemnitz | Verfahren zur Bearbeitung einer Schneidkante eines Zerspanungs- oder Schneidwerkzeuges und Vorichtung zur Durchführung des Verfahrens |
CN110948396B (zh) * | 2019-12-06 | 2020-12-22 | 扬州瑞顺投资咨询有限公司 | 一种大学实验室高效率等距离微粒切割装置 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0445104A3 (en) * | 1990-02-27 | 1992-08-05 | Boehler Gesellschaft M.B.H. | Method and device for entraining solid particles in a fluidic cutting stream |
GB9719550D0 (en) * | 1997-09-16 | 1997-11-19 | Miller Donald S | Fluid abrasive jets for machining |
DE102008008701A1 (de) * | 2008-02-11 | 2009-09-10 | Hammelmann Maschinenfabrik Gmbh | Verfahren und Vorrichtung zur Erzeugung eines Wasser-Abrasivstrahls |
DE102014100839B4 (de) * | 2014-01-24 | 2015-10-15 | Gottfried Wilhelm Leibniz Universität Hannover | Wasserabrasiv-Suspensionsschneideeinrichtung, Verfahren zu dessen Steuerung und Computerprogramm |
DE102014222299A1 (de) | 2014-10-31 | 2016-05-04 | Robert Bosch Gmbh | Vorrichtung zur erosiven Bearbeitung und/oder zur Reinigung eines Werkstoffs oder einer Werkstückoberfläche mittels mindestens eines Hochdruck-Fluidstrahls sowie Verfahren zum Betreiben einer solchen Vorrichtung |
-
2016
- 2016-10-25 DE DE102016220926.4A patent/DE102016220926A1/de not_active Withdrawn
-
2017
- 2017-10-04 WO PCT/EP2017/075117 patent/WO2018077576A1/de unknown
- 2017-10-04 EP EP17787120.9A patent/EP3532245B1/de active Active
Also Published As
Publication number | Publication date |
---|---|
WO2018077576A1 (de) | 2018-05-03 |
EP3532245B1 (de) | 2020-08-12 |
DE102016220926A1 (de) | 2018-04-26 |
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