EP0171779B1 - Device for surface treatment of workpieces growing brittle at low temperatures - Google Patents
Device for surface treatment of workpieces growing brittle at low temperatures Download PDFInfo
- Publication number
- EP0171779B1 EP0171779B1 EP85110079A EP85110079A EP0171779B1 EP 0171779 B1 EP0171779 B1 EP 0171779B1 EP 85110079 A EP85110079 A EP 85110079A EP 85110079 A EP85110079 A EP 85110079A EP 0171779 B1 EP0171779 B1 EP 0171779B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- granules
- intake pipe
- workpieces
- liquefied gas
- trough
- 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
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- 238000004381 surface treatment Methods 0.000 title description 8
- 239000008187 granular material Substances 0.000 claims abstract description 42
- 239000007921 spray Substances 0.000 claims abstract description 9
- 238000009835 boiling Methods 0.000 claims abstract description 7
- 239000000428 dust Substances 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 8
- 238000005422 blasting Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 2
- 238000005204 segregation Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 210000004027 cell Anatomy 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 210000003168 insulating cell Anatomy 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C3/00—Abrasive blasting machines or devices; Plants
- B24C3/18—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions
- B24C3/26—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor
- B24C3/263—Abrasive blasting machines or devices; Plants essentially provided with means for moving workpieces into different working positions the work being supported by barrel cages, i.e. tumblers; Gimbal mountings therefor using refrigerating means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S241/00—Solid material comminution or disintegration
- Y10S241/37—Cryogenic cooling
Definitions
- the invention relates to a device for the surface treatment of workpieces that can be embrittled by cold, according to the preamble of claim 1.
- Surface treatment is to be understood here primarily as deburring, stripping, separation and peeling. Surface treatments such as hardening and polishing should also be included.
- a large number of devices are known for the surface treatment of workpieces which can be embrittled by cold.
- a conveying device with which the workpieces are conveyed and circulated, furthermore a spray device for a low-boiling liquefied gas, usually nitrogen, and at least one centrifugal wheel for an abrasive such as steel casting or plastic granulate.
- Rotating drums, drum-like belts or rotating plates are known as conveying means.
- a device for deburring workpieces is known from German Offenlegungsschrift 26 50 202, in which the workpieces are conveyed on an oscillating trough which is provided with sieves for separating granules, coarse breakage and dust.
- the device is equipped with at least one centrifugal wheel which emits granules in the horizontal direction.
- the centrifugal wheel is surrounded by a conical baffle collar ring with a cone angle of approximately 90 °.
- the horizontally emitted granulate is reflected downwards by this impact collar ring onto the processing surface of the vibrating trough.
- the nozzles for the low-boiling liquefied gas are arranged on the edge of the impact collar ring.
- the known device ensures that the kinetic energy of the granules hitting the work surface is the same everywhere, it cannot be avoided that the workpieces are irradiated for different lengths of time, depending on their position on the work surface. This is irrelevant in most of the work on surface treatment that occurs, as long as the desired effect, e.g. B. complete deburring is achieved.
- Delicate, filigree molded parts are sensitive to different irradiation times. It has also been found that in certain cases such molded parts can be damaged by another effect.
- the blasted granules are always circulated, which means that dust and coarse breakage have to be separated. This happens with seven. This does not, however, detect the break that has the size of the granules. This break is blasted along with the original granules and only gradually broken up after many passes. As a rule, this is completely irrelevant for surface processing. However, if this break is harder or has a greater density than the granulate, it can damage delicate filigree molded parts or molded parts with sensitive surfaces.
- the invention is therefore based on the object to provide a device for surface treatment of cold-brittle workpieces, which, starting from the known device, enables even sensitive and small filigree molded parts, possibly in small batches, to be processed quickly and gently.
- the device according to the invention is based on the one hand on the idea of making the machining surface identical in shape and size to the beam image. It is achieved in that the workpieces are not only irradiated by pellet particles with the same kinetic energy, but that the total number of incident pellets for each workpiece is almost the same as it passes through the vibrating trough.
- the measure according to the invention of arranging an additional spray nozzle for low-boiling liquefied gas in the inlet region of the intake pipe of the self-priming centrifugal wheel ensures that the granules which are captured by the centrifugal wheel are already deep-frozen.
- the fracture conveyed with the granules in the circuit is thereby embrittled and shattered when it hits the collar rings so that it can no longer damage the sensitive molded parts.
- the jet device consists of the self-priming centrifugal wheel 11, which is driven by the motor 10.
- the centrifugal wheel sucks the granules through the suction pipe 12 and radiates them onto the impact collar ring 9 in the horizontal direction.
- the impact collar ring 9 reflects the granules onto the processing trough 2.
- spray nozzles. 8 attached for spraying liquid nitrogen.
- the finished molded parts reach the outside through the outlet 15.
- the embodiment according to FIGS. 2 and 3 differs from that according to FIG. 1 essentially only by the smaller inside diameter of the oscillating trough. The same designations have therefore been used for the same parts, and the insulation cell 17 is also shown.
- a spray nozzle 14 for liquid nitrogen is arranged in the inlet area of the intake pipe 12.
- the sucked-in granulate is cooled down strongly by the liquid nitrogen.
- This cooling has the effect that material particles, such as burrs or coating residues, which are the same size as the granules and therefore cannot be separated from the stream of granules by sieving, become brittle and are broken up on impact with the impact collar ring 9. It can therefore no longer happen that, in the case of materials whose density is greater than that of the granules, the molded parts are damaged because of the higher kinetic energy of the material particles which have been cut off.
- the device makes it possible to screen out the material residues that have been smashed in this way, which increases the purity of the circulating granules.
- a particularly advantageous embodiment is obtained when the spray nozzle 14 is arranged below the inlet opening of the suction pipe in its axis in the direction of flow.
- This arrangement intensifies the flow of granules into the intake pipe 12, whereby the amount of granules in circulation is increased.
- a further increase in the flow of granules is effected by the inlet nozzle 18 arranged at the inlet end of the suction pipe 12. This has the shape of a funnel and surrounds the suction pipe 12 with the formation of an annular space.
- the inlet nozzle 18 detects a part of the granulate flowing back from the sieve trough 4 into the collecting container 13 and conveys it into the intake pipe 12.
- the surface processing can be individually adapted to the most varied of molded parts.
- the connections to the outside through the insulation cell 17 are reduced to a minimum, the insulation effect is therefore high and the coolant requirement is low.
- the centrifugal wheel speed and the type and size of granulate the most varied radiation energy densities can be achieved on the processing surface, so that a wide variety of materials, shapes and burr thicknesses can be taken into account.
- the processing time can also be largely varied.
- blasting media can neither be scattered, nor can dust and cold gas leave the system unintentionally, which increases operational readiness.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing Of Solid Wastes (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Turning (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Cleaning In General (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur Oberflächenbearbeitung von kälteversprödbaren Werkstücken, nach dem Oberbegriff des Anspruches 1. Unter Oberflächenbearbeitung sind hierbeivor allem Entgraten, Entlacken, Trennen und Schälen zu verstehen. Aber auch Oberflächenbehandlungen wie Härten und polieren sollen mitumfaßt werden.The invention relates to a device for the surface treatment of workpieces that can be embrittled by cold, according to the preamble of claim 1. Surface treatment is to be understood here primarily as deburring, stripping, separation and peeling. Surface treatments such as hardening and polishing should also be included.
Zur Oberflächenbearbeitung von kälteversprödbaren Werkstücken ist eine Vielzahl von Vorrichtungen bekannt. Allen diesen Vorrichtungen gemeinsam ist eine Fördereinrichtung, mit der die Werkstücke gefördert und umgewälzt werden, ferner eine Sprühvorrichtung für ein tiefsiedendes verflüssigtes Gas, in der Regel Stickstoff und mindestens ein Schleuderrad für ein Strahlmittel wie beispielsweise Stahlgieß- oder Kunststoffgranulat. Als Fördermittel sind inbesondere rotierende Trommeln, trommelartig umlaufende Bänder oder rotierende Teller bekannt. Aus der Deutschen Offenlegungsschrift 26 50 202 ist eine Vorrichtung zum Entgraten von Werkstücken bekannt, bei der die Werkstücke auf einem Schwingtrog gefördert werden, welcher mit Sieben zum Abtrennen von Granulat, grobem Bruch und Staub versehen ist. Die Vorrichtung ist mit mindestens einem in horizontaler Richtung Granulat abstrahlenden Schleuderrad ausgestattet. Das Schleuderrad ist von einem kegelförmigen Prallkragenring mit einem Kegelwinkel von ungefähr 90° umgeben. Das horizontal abgestrahlte Granulat wird von diesem Prallkragenring nach unten auf die Bearbeitungsfläche des Schwingtroges reflektiert. Am Rande des Prallkragenringes sind die Düsen für das tiefsiedende verflüssigte Gas angeordnet. Mit dieser bekannten Vorrichtung lassen sich die normalerweise auszuführenden Oberflächenbearbeitungen von kälteversprödbaren Werkstücken zufriedenstellend durchführen. Eine Ausnahme machen lediglich kleine und filigrane Formteile, die schnell und schonend bearbeitet werden sollen und normalerweise nur in kleinen Chargen anfallen. Obwohl die bekannte Vorrichtung gewährleistet, daß die kinetische Energie des auf die Arbeitsfläche aufprallenden Granulats überall gleich ist, läßt es sich nicht vermeiden, daß die Werkstücke, je nach ihrer position auf der Bearbeitungsfläche, unterschiedlich lange bestrahlt werden. Dies ist bei den meisten vorkommenden Arbeiten zur Oberflächenbehandlung unerheblich, solange nur der angestrebte Effekt, z. B. vollständige Entgratung, erreicht wird. Zarte filigrane Formteile reagieren jedoch empfindlich, auf unterschiedliche Bestrahlungszeiten. Es hat sich ferner gezeigt, daß in bestimmten Fällen derartige Formteile durch einen weiteren Effekt beschädigt werden können.A large number of devices are known for the surface treatment of workpieces which can be embrittled by cold. Common to all of these devices is a conveying device with which the workpieces are conveyed and circulated, furthermore a spray device for a low-boiling liquefied gas, usually nitrogen, and at least one centrifugal wheel for an abrasive such as steel casting or plastic granulate. Rotating drums, drum-like belts or rotating plates are known as conveying means. A device for deburring workpieces is known from German Offenlegungsschrift 26 50 202, in which the workpieces are conveyed on an oscillating trough which is provided with sieves for separating granules, coarse breakage and dust. The device is equipped with at least one centrifugal wheel which emits granules in the horizontal direction. The centrifugal wheel is surrounded by a conical baffle collar ring with a cone angle of approximately 90 °. The horizontally emitted granulate is reflected downwards by this impact collar ring onto the processing surface of the vibrating trough. The nozzles for the low-boiling liquefied gas are arranged on the edge of the impact collar ring. With this known device, the surface machining of workpieces that can be embrittled by cold can normally be carried out satisfactorily. The only exception is small and filigree molded parts, which are to be processed quickly and gently and usually only occur in small batches. Although the known device ensures that the kinetic energy of the granules hitting the work surface is the same everywhere, it cannot be avoided that the workpieces are irradiated for different lengths of time, depending on their position on the work surface. This is irrelevant in most of the work on surface treatment that occurs, as long as the desired effect, e.g. B. complete deburring is achieved. Delicate, filigree molded parts are sensitive to different irradiation times. It has also been found that in certain cases such molded parts can be damaged by another effect.
Das abgestrahlte Granulat wird nämlich immer im Kreislauf geführt, wozu es erforderlich ist, Staub und groben Bruch abzutrennen. Dies geschieht mit Sieben. Hierdurch wird jedoch nicht der Bruch erfaßt, der die Größe der Granulatkörner besitzt. Dieser Bruch wird zusammen mit dem ursprünglichen Granulat abgestrahlt und erst nach vielen Durchläufen allmählich zertrümmert. In der Regel ist dies für die Oberflächenbearbeitung völlig unerheblich. Wenn dieser Bruch jedoch härter ist oder eine größere Dichte besitzt als das Granulat, kann er zarte filigrane Formteile oder Formteile mit empfindlichen Oberflächen beschädigen.The blasted granules are always circulated, which means that dust and coarse breakage have to be separated. This happens with seven. This does not, however, detect the break that has the size of the granules. This break is blasted along with the original granules and only gradually broken up after many passes. As a rule, this is completely irrelevant for surface processing. However, if this break is harder or has a greater density than the granulate, it can damage delicate filigree molded parts or molded parts with sensitive surfaces.
Der Erfindung liegt daher die Aufgabe zugrunde, eine Vorrichtung zur Oberflächenbearbeitung von kälteversprödbaren Werkstücken zu schaffen, die es, ausgehend von der bekannten Vorrichtung, ermöglicht, auch empfindliche und kleine filigrane Formteile, gegebenenfalls in kleinen Chargen, schnell und schonend zu bearbeiten.The invention is therefore based on the object to provide a device for surface treatment of cold-brittle workpieces, which, starting from the known device, enables even sensitive and small filigree molded parts, possibly in small batches, to be processed quickly and gently.
Ausgehend von dem im Oberbegriff des Anspruches 1 berücksichtigten Stand der Technik ist diese Aufgabe erfindungsgemäß gelöst mit den im kennzeichnenden Teil des Anspruches 1 angegebenen Merkmalen. Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Starting from the prior art taken into account in the preamble of claim 1, this object is achieved according to the invention with the features specified in the characterizing part of claim 1. Advantageous developments of the invention are specified in the subclaims.
Die erfindungsgemäße Vorrichtung beruht also zum einen auf dem Gedanken, die Bearbeitungsfläche in Form und Größe mit dem Strahlbild identisch zu machen. Es wird dadurch erreicht, daß die Werkstücke nicht nur durch Granulattellchen mit gleicher kinetischer Energie bestrahlt werden, sondern daß die Gesamtzahl der auftreffenden Granulatkörner für jedes Werkstück beim Durchlaufen des Schwingtroges nahezu gleich ist.The device according to the invention is based on the one hand on the idea of making the machining surface identical in shape and size to the beam image. It is achieved in that the workpieces are not only irradiated by pellet particles with the same kinetic energy, but that the total number of incident pellets for each workpiece is almost the same as it passes through the vibrating trough.
Durch die erfindungsgemäße Maßnahme, eine zusätzliche Sprühdüse für tiefsiedendes verflüssigtes Gas im Eintrittsbereich des Ansaugrohres des selbstansaugenden Schleuderrades anzuordnen, wird erreicht, daß das Granulat, welches vom Schleuderrad erfaßt wird, bereits tiefgekühlt ist. Der mit dem Granulat im Kreislauf geförderte Bruch wird dadurch versprödet und beim Auftreffen auf die prallkragenringe zertrümmert, so daß er die empfindlichen Formteile nicht mehr beschädigen kann. Weitere Vorteile der Erfindung ergeben sich aus der nun folgenden Beschreibung eines Ausführungsbeispieles. Es handelt sich hierbei um eine Vorrichtung zur Oberflächenbearbeitung gemäß der Erfindung, die in verschiedener Größe hergestellt werden kann, mit Vorteil jedoch als Kleinanlage zur Bearbeitung kleiner Chargen. Die Vorrichtung soll anhand der beigefügten Zeichnungen erläutert werden.The measure according to the invention of arranging an additional spray nozzle for low-boiling liquefied gas in the inlet region of the intake pipe of the self-priming centrifugal wheel ensures that the granules which are captured by the centrifugal wheel are already deep-frozen. The fracture conveyed with the granules in the circuit is thereby embrittled and shattered when it hits the collar rings so that it can no longer damage the sensitive molded parts. Further advantages of the invention result from the following description of an embodiment. This is a surface processing device according to the invention, which can be manufactured in different sizes, but advantageously as a small system for processing small batches. The device will be explained with reference to the accompanying drawings.
Es zeigen :
- Fig. 1 eine teilweise geschnittene perspektivische Darstellung der Strahleinrichtung und des Schwingtroges einer erfindungsgemäßen Einrichtung,
- Fig. 2 eine gegenüber Fig. 1 etwas abgewandelte Vorrichtung im Längsschnitt,
- Fig. 3 einen Schnitt entlang der Linie A-B von Fig. 2.
- Fig. 1 zeigt das Innenteil einer erfindungsgemä- ßen Vorrichtung zur Oberflächenbearbeitung von kälteversprödbaren Werkstücken, bestehend aus der Strahleinrichtung und dem Schwingtrog. Dieser Innenteil befindet sich in einer nicht dargestellten Isolierzelle. Die zu bearbeitenden Formteile werden über eine Rutsche 1 in den
kreisringförmigen Bearbeitungstrog 2 gefüllt, der Teil des Schwingtroges ist. Derkreisringförmige Bearbeitungstrog 2 stellt die Bearbeitungsfläche dar, die vom abgestrahlten Granulat gleichförmig beaufschlagt wird. Grober Abfall, Granulat und Staub fallen durch Sieböffnungen imBearbeitungstrog 2 in den Siebtrog 3 für groben Abfall. Hier wird der grobe Abfall abgesiebt, der durch einenSchacht 21, denFaltenbalg 19 und die Staub- undAbfallschleuse 16 nach außen gefördert wird. Granulat und Staub gelangen in den Siebtrog 4 für Granulat, wo der Staub abgesiebt wird. Dieser fällt in denStaubtrog 5 und gelangt ebenfalls durch denSchacht 21, denFaltenbalg 19 und die Staub- undAbfallschleuse 16 nach außen. DerBearbeitungstrog 2, der Siebtrog 3 für groben Abfall, der Siebtrog 4 für Granulat und derStaubtrog 5 stellen zusammen den Schwingtrog dar. Dieser wird durch zweiUnwuchtmotoren 6 in Vibration gesetzt. Durch die Vibration werden sowohl die Formteile in Richtung der pfeile 22 gefördert und mittels derEinbauten 7 gewendet und umgewälzt, als auch das Granulat von Abfall und Staub getrennt. Das abgetrennte Granulat fällt vom Siebtrog 4 über eineRutsche 23 in denSammelbehälter 13 für Granulat. Bei der Ausführungsform nach Fig. 2 entfällt dieRutsche 23, da hier der Innendurchmesser des Schwingtroges so verkleinert ist, daß das Granulat unmittelbar in denSammelbehälter 13 fallen kann.
- 1 is a partially sectioned perspective view of the beam device and the vibrating trough of a device according to the invention,
- 2 is a somewhat modified device in longitudinal section compared to FIG. 1,
- 3 shows a section along the line AB of FIG. 2nd
- 1 shows the inner part of a f ß Device for surface treatment of workpieces that can become cold, consisting of the blasting device and the vibrating trough. This inner part is located in an insulating cell, not shown. The molded parts to be processed are filled via a slide 1 into the
annular processing trough 2, which is part of the vibrating trough. Thecircular processing trough 2 represents the processing surface which is uniformly acted upon by the blasted granulate. Coarse waste, granules and dust fall through sieve openings in processingtrough 2 intosieve trough 3 for coarse waste. Here the coarse waste is screened out, which is conveyed to the outside through ashaft 21, thebellows 19 and the dust andwaste lock 16. Granules and dust enter the sieve trough 4 for granules, where the dust is sieved off. This falls into thedust trough 5 and also reaches the outside through theshaft 21, thebellows 19 and the dust andwaste lock 16. Theprocessing trough 2, the sieve trough 3 for coarse waste, the sieve trough 4 for granulate and thedust trough 5 together represent the vibrating trough. This is set in vibration by twounbalance motors 6. Due to the vibration, the molded parts are conveyed in the direction of thearrows 22 and turned and circulated by means of theinternals 7, and the granules are separated from waste and dust. The separated granulate falls from the sieve trough 4 via achute 23 into thecollection container 13 for granulate. In the embodiment according to FIG. 2, thechute 23 is omitted, since here the inside diameter of the vibrating trough is reduced so that the granules can fall directly into the collectingcontainer 13.
Die Strahleinrichtung besteht aus dem selbstansaugenden Schleuderrad 11, welches vom Motor 10 angetrieben wird. Durch das Ansaugrohr 12 saugt das Schleuderrad das Granulat an und strahlt es in horizontaler Richtung auf den Prallkragenring 9 ab. Der Prallkragenring 9 reflektiert das Granulat auf den Bearbeitungstrog 2. Am Rande des Prallkrägenringes 9 sind Sprühdüsen. 8 zum Versprühen von flüssigen Stickstoff angebracht. Die fertig bearbeiteten Formteile gelangen durch den Auslauf 15 nach außen. Die Ausführungsform gemäß Fig. 2 und 3 unterscheidet sich von der nach Fig. 1 im wesentlichen nur durch den kleineren Innendurchmesser des Schwingtroges. Für gleiche Teile wurden daher die gleichen Bezeichnungen verwendet, zusätzlich ist die lsolierzelle 17 dargestellt.The jet device consists of the self-priming
Erfindungsgemäß ist im Eintrittsbereich des Ansaugrohres 12 eine Sprühdüse 14 für flüssigen Stickstoff angeordnet. Das angesaugte Granulat wird durch den flüssigen Stickstoff stark abgekühlt. Diese Kühlung bewirkt, daß Materialteilchen, wie Grat oder Beschichtungsreste, die die gleiche Größe wie das Granulat haben und deshalb nicht durch Sieben aus dem Granulatstrom getrennt werden können, verspröden und beim Aufprall auf den prallkragenring 9 zerschlagen werden. Daher kann es nicht mehr passieren, daß bei Materialien, deren Dichte größer ist als die des Granulats, die Formteile wegen der höheren kinetischen Energie der abgeschlagenen Materialteilchen beschädigt werden. Außerdem ermöglicht es die Vorrichtung, die derartig zertrümmerten Materialreste auszusieben, wodurch die Reinheit des umlaufenden Granulats erhöht wird.According to the invention, a spray nozzle 14 for liquid nitrogen is arranged in the inlet area of the
Eine besonders vorteilhafte Ausführungsform ergibt sich, wenn die Sprühdüse 14 unterhalb der Eintrittsöffnung des Ansaugrohres in dessen Achse in Strömungsrichtung angeordnet ist. Diese Anordnung intensiviert den Granulatstrom in das Ansaugrohr 12, wodurch die im Kreislauf befindliche Granulatmenge erhöht wird. fine weitere Erhöhung des Granulatstromes bewirkt die am Eintrittsende des Ansaugrohres 12 angeordnete Einlaufdüse 18. Diese hat die Form eines Trichters und umgibt das Ansaugrohr 12 unter Ausbildung eines Ringraumes. Die Einlaufdüse 18 erfaßt einen Teil des vom Siebtrog 4 in den Sammelbehälter 13 zurückströmenden Granulats und befördert es in das Ansaugrohr 12. Neben der Erhöhung des Granulatstromes ergibt sich hierdurch eine besonders gute Kühlmittelausnutzung, da bevorzugt noch abgekühltes Granulat vom Siebtrog 4 erneut in das Ansaugrohr 12 gelangt und das wärmere Granulat aus dem Sammelbehälter 13 in verringertem Maße angesaugt wird. Der gesamte Schwingtrog steht auf Federelementen 20. An allen Übergängen von schwingenden zu ruhenden Elementen befinden sich Faltenbälge 19, so daß keine Klemmstellen entstehen können, in denen die Werkstücke beschädigt werden könnten.A particularly advantageous embodiment is obtained when the spray nozzle 14 is arranged below the inlet opening of the suction pipe in its axis in the direction of flow. This arrangement intensifies the flow of granules into the
Durch Verändern der Schwingungsamplitude und der Schwingungsfrequenz sowie durch die Form der Einbauten 7 als Kipp- oder Rollschnellen kann die Oberflächenbearbeitung den unterschiedlichsten Formteilen individuell angepaßt werden. Die Verbindungen nach außen durch die Isolierzelle 17 sind auf ein Mindestmaß verringert, die Isolationswirkung daher hoch und der Kühlmittelbedarf gering. Dies ermöglicht es, die erfindungsgemäße Vorrichtung auch als Kleinanlage für sehr kleine Formteilchargen auzuführen. Durch Veränderung der Schleuderraddrehzahl und der Granulatart und Granulatgröße können die verschiedensten Strahlenergiedichten auf der Bearbeitungsfläche erzielt werden, so daß unterschiedlichsten Materialien, Formen und Gratdicken Rechnung getragen werden kann. Auch die Bearbeitungszeit kann weitgehend variiert werden.By changing the vibration amplitude and the vibration frequency as well as by the shape of the
Da keine Relativbewegungen zwischen Bearbeitungsteil und Aussiebung stattfinden, kann weder Strahlmittel verstreut werden, noch können Staub und kaltes Gas die Anlage ungezielt verlassen, was die Betriebsbereitschaft erhöht.Since there are no relative movements between the machining part and screening, blasting media can neither be scattered, nor can dust and cold gas leave the system unintentionally, which increases operational readiness.
Da die Wälzung durch Vibration und Kippen bzw. Abrollen an fest eingebauten Teilen erzeugt wird, können die Teile nicht eingeklemmt werden, wie es bei Muldenbändern und Trommeln geschehen kann, wo besonders kleine und filigrane Teile zwischen bewegten und ruhenden Elementen zerquetscht werden können.As the rolling is generated by vibration and tilting or rolling on permanently installed parts, the parts cannot be pinched, as can happen with trough belts and drums, where particularly small and delicate parts can be crushed between moving and stationary elements.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT85110079T ATE43085T1 (en) | 1984-08-18 | 1985-08-10 | DEVICE FOR SURFACE TREATMENT OF COLD-PROTECTIVE WORKPIECES. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3430529 | 1984-08-18 | ||
DE19843430529 DE3430529A1 (en) | 1984-08-18 | 1984-08-18 | DEVICE FOR SURFACE PROCESSING OF REFRIGERABLE WORKPIECES |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0171779A2 EP0171779A2 (en) | 1986-02-19 |
EP0171779A3 EP0171779A3 (en) | 1987-05-13 |
EP0171779B1 true EP0171779B1 (en) | 1989-05-17 |
Family
ID=6243431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85110079A Expired EP0171779B1 (en) | 1984-08-18 | 1985-08-10 | Device for surface treatment of workpieces growing brittle at low temperatures |
Country Status (5)
Country | Link |
---|---|
US (1) | US4637174A (en) |
EP (1) | EP0171779B1 (en) |
JP (1) | JPS6161766A (en) |
AT (1) | ATE43085T1 (en) |
DE (1) | DE3430529A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3810463A1 (en) * | 1988-03-26 | 1989-10-12 | Messer Griesheim Gmbh | METHOD FOR DEBURRING REFRIGERABLE MOLDED PARTS |
TW277020B (en) * | 1994-04-22 | 1996-06-01 | Richihil Kk | Separating device of blasting particle |
CN114274053B (en) * | 2021-12-31 | 2022-11-01 | 重庆芯洁科技有限公司 | Sand blasting machine suitable for special-shaped parts |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE685138C (en) * | 1936-09-09 | 1939-12-13 | Alfred Gutmann Akt Ges Fuer Ma | Cleaning of workpieces using centrifugal material |
US2131772A (en) * | 1938-04-01 | 1938-10-04 | American Foundry Equip Co | Method and apparatus for treating metal articles |
US3008274A (en) * | 1959-03-18 | 1961-11-14 | Bell Intercontinental Corp | Blasting machine |
DE2159838C2 (en) * | 1971-12-02 | 1973-10-31 | Messer Griesheim Gmbh, 6000 Frankfurt | Device for deburring workpieces |
DE7307364U (en) * | 1972-02-29 | 1973-06-07 | L Air Liquide Sa | |
DE2233111C3 (en) * | 1972-07-06 | 1974-11-28 | Hermann 2105 Seevetal Jacob | Method and device for the regeneration of synthetic resin-bonded foundry sand |
GB1486084A (en) * | 1975-04-16 | 1977-09-14 | Messer Griesheim Gmbh | Apparatus for deburring workpieces |
DE2650202A1 (en) * | 1976-11-02 | 1978-05-11 | Messer Griesheim Gmbh | DEVICE FOR DEBURRING WORKPIECES |
US4519812A (en) * | 1983-10-28 | 1985-05-28 | Aga Ab | Cryogen shot blast deflashing system with jointed supply conduit |
-
1984
- 1984-08-18 DE DE19843430529 patent/DE3430529A1/en not_active Withdrawn
-
1985
- 1985-08-10 AT AT85110079T patent/ATE43085T1/en active
- 1985-08-10 EP EP85110079A patent/EP0171779B1/en not_active Expired
- 1985-08-12 US US06/764,863 patent/US4637174A/en not_active Expired - Fee Related
- 1985-08-19 JP JP60180622A patent/JPS6161766A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0171779A3 (en) | 1987-05-13 |
US4637174A (en) | 1987-01-20 |
DE3430529A1 (en) | 1986-02-27 |
JPS6161766A (en) | 1986-03-29 |
EP0171779A2 (en) | 1986-02-19 |
ATE43085T1 (en) | 1989-06-15 |
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