EP0639747A1 - Procédé et dispositif de séchage d'une pièce de fabrication ayant subi un traitement de nettoyage pour un fluide de nettoyage - Google Patents

Procédé et dispositif de séchage d'une pièce de fabrication ayant subi un traitement de nettoyage pour un fluide de nettoyage Download PDF

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Publication number
EP0639747A1
EP0639747A1 EP93116589A EP93116589A EP0639747A1 EP 0639747 A1 EP0639747 A1 EP 0639747A1 EP 93116589 A EP93116589 A EP 93116589A EP 93116589 A EP93116589 A EP 93116589A EP 0639747 A1 EP0639747 A1 EP 0639747A1
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EP
European Patent Office
Prior art keywords
chamber
air
workpiece
drying
during
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
Application number
EP93116589A
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German (de)
English (en)
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EP0639747B1 (fr
Inventor
Karl-Heinz Wüller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duerr GmbH
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Duerr GmbH
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Publication of EP0639747B1 publication Critical patent/EP0639747B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/08—Humidity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum

Definitions

  • Machining workpieces in particular require cleaning after machining in order to remove chips, but also components of coolants and cutting fluids adhering to the workpieces.
  • the workpieces are sprayed with a cleaning liquid in a cleaning chamber and / or washed by immersing them in the cleaning liquid and moving the workpieces, whereupon they are dried in the cleaning chamber or a drying chamber arranged after it.
  • a cleaned and to-be-dried workpiece is currently being placed in a chamber or another suitable station (where it is e.g. a special drying chamber, but can also be a cleaning chamber), which is equipped with compressed air-fed blowing nozzles, each of which is directed towards such a surface area with a contour that retains the cleaning fluid (which of course means precise positioning of the workpiece in of the chamber and therefore requires considerable design effort).
  • a chamber or another suitable station where it is e.g. a special drying chamber, but can also be a cleaning chamber
  • compressed air-fed blowing nozzles each of which is directed towards such a surface area with a contour that retains the cleaning fluid (which of course means precise positioning of the workpiece in of the chamber and therefore requires considerable design effort).
  • Practice has shown, however, that even well-aligned blow nozzles and high compressed air pressure are often not sufficient to completely dry out holes and the like; this is e.g. B.
  • the compressed air retained in a blind hole remaining cleaning fluid can not completely drive out of the one-sided closed hole, especially if it is a threaded hole in which the compressed air pushes the remaining cleaning fluid together in the threads, but prevent this that the remaining cleaning liquid can be driven out of the bore by the compressed air.
  • the remaining cleaning liquid then runs, especially in vertically oriented bores, together in the lower boring area, so that even an inherent heat of the workpiece originating from the previously performed cleaning process can no longer cause complete evaporation of the remaining cleaning liquid.
  • a workpiece is to be dried by a "vacuum shock" by suddenly and completely opening a connecting line between a vacuum container serving as a vacuum store and the drying chamber; but if z. B. has accumulated cleaning liquid on the bottom of a vertically oriented blind hole, this is not completely expelled even by such a "vacuum shock" because the open surface which allows steam to escape is too small in relation to the liquid volume, and the same applies to troughs, especially if if the inherent heat of the workpiece to be dried is not high enough.
  • the cleaned workpiece is placed in a drying chamber which can be closed in a pressure-tight manner and held there in such a way that nozzles provided in the chamber are directed towards the workpiece surface areas with contours retaining cleaning liquid.
  • the chamber is then closed in a pressure-tight manner and evacuated to evaporate cleaning liquid, whereupon a valve which connects the nozzles to the atmosphere surrounding the chamber is opened;
  • the nozzles When the pressure is equalized, the nozzles generate air jets which are directed at contours that hold back cleaning liquid on the workpiece surface areas and are intended to remove and distribute cleaning liquid retained by the workpiece.
  • the chamber is then evacuated again to evaporate the remaining cleaning liquid.
  • the invention was based on the object of providing a drying method with which workpieces to be dried individually can be dried satisfactorily even after cleaning with an aqueous cleaning liquid within a shorter time than is possible with the drying methods described above.
  • this object can be achieved according to the invention in that the workpiece is subjected to the drying process with an initial temperature of at least about 45 ° C, rotated during the blowing with air jets and in the chamber during an evaporation period of at least 8 seconds and at most 30 seconds is exposed to a vacuum and that the air pressure in the chamber - based on atmospheric pressure - during the entire evaporation period at least essentially is continuously reduced to a minimum value of approximately 4 mbar to approximately 0.5 mbar.
  • the workpieces are cleaned with heated cleaning fluid, e.g. B. with heated to 70 ° C or 80 ° C cleaning liquid, which leads to the fact that the workpieces still have a significant inherent heat during the drying process following the cleaning; But even if the cleaning liquid is not heated separately, the workpieces have a temperature of at least approx. 45 ° C at the end of the cleaning process, because during the cleaning process the cleaning liquid pumped around by pumps is brought to temperatures due to the waste heat from these pumps lead to a final temperature of the cleaned workpieces of at least approx. 45 ° C. However, it is obvious that the cleaned workpieces can be dried more quickly and completely, the higher their temperature at the beginning of the drying process.
  • heated cleaning fluid e.g. B. with heated to 70 ° C or 80 ° C cleaning liquid
  • the method according to the invention is further based on the finding that it is completely sufficient for evaporation of cleaning liquid remaining on the workpiece after the workpiece has been blown off, during the evaporation period the pressure in the chamber receiving the workpiece - starting from approximately atmospheric pressure - at least in the significantly lower continuously, d. H. that it is not necessary to evacuate the chamber largely abruptly, which means that the outlay on equipment can be drastically reduced, since it is sufficient to connect a simple vacuum pump to the chamber and gradually evacuate it and the pressure in the chamber to a value to reduce, which is not greater than about 4 mbar, but in no case has to be less than about 0.5 mbar in order to get by with an evaporation period of at most about 30 seconds. It has been shown that if these values are adhered to, a longer dwelling of the workpiece in the evacuated chamber is unnecessary and cannot further improve the drying result.
  • the drying method according to the invention also eliminates the disadvantage of known drying methods in which the workpiece is blown off with compressed air jets, namely that Swaths of nebulized cleaning liquid emerge into the hall surrounding the drying station and into these cleaning-effective components of the cleaning liquid, but also dirt components and components of cooling and cutting fluids used in the machining of workpieces.
  • the pressure in the chamber in which the remaining cleaning liquid is evaporated is reduced only to a value of approximately 2 mbar or approximately 3 mbar, since if the other values listed above have been observed, it has been shown that after reaching a pressure of 2 mbar, no residual cleaning liquid remained on the workpiece to be dried.
  • a workpiece to be dried can be blown off in one and the same chamber and exposed to a vacuum in order to evaporate the cleaning liquid that has not been removed by the blowing off.
  • this is only recommended if the total time available for blowing off and evaporation (namely the cycle time minus non-productive times) is sufficiently long, taking into account the workpiece structure, the inherent heat of the cleaned workpiece at the start of the drying process and other parameters relevant to the drying process to achieve a satisfactory drying result.
  • Preferred embodiments of the drying method according to the invention are characterized in that the evaporation period is only about 15 seconds, and in such a case, taking into account the cycle times required today, a workpiece to be dried can be blown off in a single station and exposed to a vacuum to evaporate the remaining cleaning liquid . In other cases, in which the cycle time does not allow such a procedure, the workpiece to be dried is blown off in two successive stations or subjected to a vacuum.
  • the drying process according to the invention is designed so that the workpiece arranged in a chamber during blowing with air jets and the air for generating the air jets is at least partially guided in a circuit containing a blower and is at least partially dehumidified outside the chamber.
  • Part of the drying air can e.g. B. derived from the hall roof, but particularly preferred embodiments are in which the entire drying air circulates in a closed circuit.
  • this embodiment has the further advantages that an appreciable excess pressure in the chamber during the blowing off of the workpiece and thus steam escape from the chamber is avoided and splash water can be drained off in a controlled manner.
  • the at least partial dehumidification of the drying air behind the chamber can be accomplished by cooling and / or separating drops, for example by means of a baffle plate. If, as already mentioned, the workpiece is blown off in the chamber in which the remaining cleaning liquid is evaporated by evacuating the chamber, it is also recommended that the air used to blow off the workpiece be circulated through a bypass bridging the chamber during the evaporation period to guide and further dehumidify, so that for the process of dehumidifying the drying air there is also the period of time during which the remaining cleaning liquid is evaporated by evacuating the chamber.
  • the invention also relates to a device for carrying out the method according to the invention, which has a chamber for receiving the workpiece to be dried, in which blow nozzles for blowing off the workpiece are arranged, and according to the invention, such a device is characterized an air circuit containing the chamber, its nozzles, at least one blower and a dehumidifier, and a workpiece carrier rotatably mounted and rotatably drivable in the chamber.
  • Fig. 1 shows a drying chamber 10, which has a cross-sectionally angular or conical bottom 12 and a hood 14, with the help of which the drying chamber can be loaded and unloaded from above and sealed airtight.
  • a shaft 16 indicated by dash-dotted lines, is rotatably supported, the one shaft end being passed pressure-tight through the right side wall of the drying chamber in accordance with FIG.
  • the wave 16 is divided into two parts and holds a workpiece carrier 20 between its two parts, into which a cleaned and to be dried workpiece 22 can be inserted so that the shaft 16 together with workpiece carrier 20 and workpiece 22 can be rotated without the workpiece being displaced relative to the workpiece carrier becomes.
  • a nozzle plate 24 is fastened to the hood 14, which in turn carries a plurality of nozzles 26 which are directed towards a workpiece 22 held by the workpiece carrier 20 and communicate with an air chamber 28 which is formed by the actual hood 14 and the nozzle plate 24.
  • An air circuit formed by a ring pipe 30 and the drying chamber 10 contains, in succession, a first shut-off valve 32, a dehumidifier 34, a blower 36 and a second shut-off valve 38, the dehumidifier preferably being a cooler, but which also baffles for separating May contain moisture droplets.
  • a bypass pipe 40 arranged between the dehumidifier 34 and the blower 36 on the one hand and the two shut-off valves 32 and 38 on the other hand contains a third shut-off valve 42.
  • a drain line 44 branches off from the lower branch of the ring pipe 30 and is normally closed by a drain valve 46.
  • a vacuum pump 48 is provided, which is connected to the drying chamber 10 via an evacuation line 52 containing a shutoff valve 50.
  • a dirt trap 54 is arranged in the bottom 12 above the confluence of the ring pipe 30 in this bottom.
  • the workpiece carrier 20, as is known from such drying devices, is designed such that when the workpiece 22 is rotated, all areas of the workpiece surface to be blown off can be acted upon by the air jets generated by the nozzles 26.
  • the workpiece is first inserted into the workpiece carrier 20, whereupon the hood 14 is closed and the drying chamber 10 is thus made airtight. Then, with the valves 42, 46 and 50 closed and the motor 18 switched on, the rotating workpiece 22 is blown off from all sides with air jets generated by the nozzles 26, the drying air being circulated and at least partially dehumidified by the dehumidifier 34 becomes.
  • the valves 32 and 38 are closed, the valves 42 and 50 are opened and the vacuum pump 48 is switched on. Then, over a period of time, called the evaporation period, the air pressure in the drying chamber 10 is reduced more or less continuously and the cleaning liquid remaining on the workpiece 22 is thereby evaporated, while at the same time the previously used drying air continues to circulate via part of the ring pipe 30 and the bypass pipe 40 guided and dehumidified by the dehumidifier 34 as much as possible. At the same time, in order to save time, the workpiece carrier 20 is rotated into its loading and unloading position by means of the motor 18 and then stopped.
  • the vacuum pump is activated 48 switched off, the drying chamber 10 opened with the aid of the hood 14 and the dried workpiece 22 removed from the drying chamber 10. If necessary, the drying chamber 10 can be ventilated by a ventilation valve (not shown) before the hood 14 is swung open or raised, should ventilation of the previously evacuated drying chamber 10 not be possible via the evacuation line 52 and the switched off vacuum pump 48 when the valve 50 is open.
  • cleaning liquid collects in the lower branch of the ring pipe 30 during the blowing off of a workpiece, this cleaning liquid can be drained off via the drain valve 46 during loading and unloading of the drying chamber 10.
  • FIGS. 2A and 2B differs from that according to FIG. 1 only in that two chambers 10 'and 10''are provided, in the first of which, namely in chamber 10', a workpiece 22 'to be dried is blown off is, whereupon the workpiece is brought into the second chamber 10 ′′ and there exposed to a vacuum and completely dried.
  • Those parts of the device according to FIGS. 2A and 2B which correspond to parts of the device according to FIG. 1 have been provided with the same reference numerals as in FIG. 1, but with the addition of a dash or two dashes.
  • the chamber 10 '' is arranged behind the chamber 10 '.
  • a workpiece 22 ′ to be dried is thus rotated and blown off, whereupon it is brought into the chamber 10 ′′ of the device part shown in FIG. 2B. Since, in preferred embodiments of the drying method according to the invention, the workpiece 22 'is not rotated as long as it is exposed to a vacuum, the chamber 10' 'is provided with a stationary workpiece carrier 20' '. Any cleaning liquid that may collect on the bottom 12 ′′ of the chamber 10 ′′ can be drained off via a drain line 44 ′′ and a drain valve 46 ′′.
  • the procedure in the device shown in FIGS. 2A and 2B corresponds to the procedure in the device in FIG. 1, but with the difference that the drying air cannot be further dehumidified while the workpiece to be dried is exposed to a vacuum , since the next workpiece to be dried is already blown off in the chamber 10 '.
  • the rotation of the workpiece to be blown off, caused by the motor 18 or 18 ', can easily be controlled in such a way as is necessary for optimal emptying of all blind holes and other cavities in the workpiece.
  • a particular advantage of the device shown in FIG. 1 is the fact that the fan 36 does not have to be switched off and started up again.
  • the chamber 10 or 10 ′′ After the chamber 10 or 10 ′′ has been evacuated, it can also be vented via the valves 32 and 46 or the valve 46 ′′ before the hood 14 or 14 ′′ is opened.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Drying Of Solid Materials (AREA)
EP93116589A 1993-08-21 1993-10-14 Procédé et dispositif de séchage d'une pièce de fabrication ayant subi un traitement de nettoyage pour un fluide de nettoyage Expired - Lifetime EP0639747B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4328199A DE4328199C1 (de) 1993-08-21 1993-08-21 Verfahren und Einrichtung zum Trocknen eines nach einer Bearbeitung mit einer Reinigungsflüssigkeit gereinigten Werkstücks
DE4328199 1993-08-21

Publications (2)

Publication Number Publication Date
EP0639747A1 true EP0639747A1 (fr) 1995-02-22
EP0639747B1 EP0639747B1 (fr) 1997-02-12

Family

ID=6495739

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EP93116589A Expired - Lifetime EP0639747B1 (fr) 1993-08-21 1993-10-14 Procédé et dispositif de séchage d'une pièce de fabrication ayant subi un traitement de nettoyage pour un fluide de nettoyage

Country Status (3)

Country Link
EP (1) EP0639747B1 (fr)
DE (2) DE4328199C1 (fr)
ES (1) ES2097418T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8179045B2 (en) 2008-04-22 2012-05-15 Teledyne Wireless, Llc Slow wave structure having offset projections comprised of a metal-dielectric composite stack
US9202660B2 (en) 2013-03-13 2015-12-01 Teledyne Wireless, Llc Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes
CN108870877A (zh) * 2018-02-23 2018-11-23 连云港佑源医药设备制造有限公司 一种脉冲真空干燥柜及干燥方法

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH691927A5 (de) * 1996-08-16 2001-11-30 Galvatec Gmbh Vorrichtung zum gepulsten Ausgeben eines Mediums zur Behandlung von Oberflächen.
DE19714603C1 (de) * 1997-04-09 1998-10-29 Schwarz Ernst Mafac Gmbh Verfahren und Vorrichtung zur Reinigung von Werkstücken
DE19853304C2 (de) * 1998-01-09 2001-02-01 Cae Beyss Gmbh Verfahren zum Trocknen eines Werkstücks
FR2839145B1 (fr) * 2002-04-30 2004-07-02 Hivert Systemes Automatises Procede de sechage sous vide d'une piece usinee et installation
DE102010038799A1 (de) * 2010-08-02 2012-02-02 Dürr Ecoclean GmbH Vorrichtung zum Trocknen von Werkstücken nach einem Reinigungsvorgang
DE102014213172A1 (de) * 2014-07-07 2016-01-07 Dürr Ecoclean GmbH Anlage für das Trocknen von Werkstücken
DE102018124988A1 (de) * 2018-10-10 2020-04-16 Ecoclean Gmbh Vorrichtung und Verfahren zum Entfernen von Flüssigkeit von einem Werkstück
CN115090575A (zh) * 2022-07-11 2022-09-23 滨州中裕食品有限公司 一种食品加工用清洗装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218733A2 (fr) * 1985-09-13 1987-04-22 ART CERAMICHE S.r.l. Procédé et installation pour le séchage rapide des produits céramiques
DE3715168A1 (de) * 1987-05-07 1988-12-01 Hoeckh Metall Reinigungs Anlag Einrichtung zum trocknen von gegenstaenden in reinigungsanlagen
DE9013241U1 (fr) * 1990-09-19 1990-11-22 Hoeckh, Juergen, 7540 Neuenbuerg, De
EP0421902A1 (fr) * 1989-10-06 1991-04-10 Ultrasons Annemasse Procédé de séchage sous vide de pièces diverses et dispositif de mise en oeuvre du procédé
DE9212437U1 (fr) * 1992-09-11 1992-11-19 Hoffmann, Klaus, O-1550 Nauen, De
DE9216954U1 (fr) * 1992-12-12 1993-04-29 Schmider, Rolf, Dipl.-Ing. (Fh), 7024 Filderstadt, De

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218733A2 (fr) * 1985-09-13 1987-04-22 ART CERAMICHE S.r.l. Procédé et installation pour le séchage rapide des produits céramiques
DE3715168A1 (de) * 1987-05-07 1988-12-01 Hoeckh Metall Reinigungs Anlag Einrichtung zum trocknen von gegenstaenden in reinigungsanlagen
EP0421902A1 (fr) * 1989-10-06 1991-04-10 Ultrasons Annemasse Procédé de séchage sous vide de pièces diverses et dispositif de mise en oeuvre du procédé
DE9013241U1 (fr) * 1990-09-19 1990-11-22 Hoeckh, Juergen, 7540 Neuenbuerg, De
EP0476235A1 (fr) * 1990-09-19 1992-03-25 Jürgen Höckh Procédé pour le séchage de matériaux après lavage dans une installation de nettoyage, et dispositif pour la mise en oeuvre du procédé
DE9212437U1 (fr) * 1992-09-11 1992-11-19 Hoffmann, Klaus, O-1550 Nauen, De
DE9216954U1 (fr) * 1992-12-12 1993-04-29 Schmider, Rolf, Dipl.-Ing. (Fh), 7024 Filderstadt, De

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8179045B2 (en) 2008-04-22 2012-05-15 Teledyne Wireless, Llc Slow wave structure having offset projections comprised of a metal-dielectric composite stack
US9202660B2 (en) 2013-03-13 2015-12-01 Teledyne Wireless, Llc Asymmetrical slow wave structures to eliminate backward wave oscillations in wideband traveling wave tubes
CN108870877A (zh) * 2018-02-23 2018-11-23 连云港佑源医药设备制造有限公司 一种脉冲真空干燥柜及干燥方法

Also Published As

Publication number Publication date
DE4328199C1 (de) 1994-10-13
EP0639747B1 (fr) 1997-02-12
DE59305462D1 (de) 1997-03-27
ES2097418T3 (es) 1997-04-01

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