EP0171779B1 - Dispositif pour le traitement de surface de pièces devenant cassantes à basses températures - Google Patents

Dispositif pour le traitement de surface de pièces devenant cassantes à basses températures Download PDF

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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
Application number
EP85110079A
Other languages
German (de)
English (en)
Other versions
EP0171779A2 (fr
EP0171779A3 (en
Inventor
Sabine Donath
Peter Holz
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.)
Messer Griesheim GmbH
Original Assignee
Messer Griesheim GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Messer Griesheim GmbH filed Critical Messer Griesheim GmbH
Priority to AT85110079T priority Critical patent/ATE43085T1/de
Publication of EP0171779A2 publication Critical patent/EP0171779A2/fr
Publication of EP0171779A3 publication Critical patent/EP0171779A3/de
Application granted granted Critical
Publication of EP0171779B1 publication Critical patent/EP0171779B1/fr
Expired legal-status Critical Current

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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.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Cleaning In General (AREA)
  • Turning (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Claims (3)

1. Dispositif de traitement de surface de pièces cassantes à basses températures, par projection à l'aide de granulés puisés dans un collecteur et circulant et par pulvérisation avec un gaz à très faible point d'ébullition, avec une roue de projection (11) distribuant de' manière rayonnante les granulés dans la direction horizontale, d'une collerette périphérique de rebondissement (9) entourant la roue de projection pour dévier les granulés sur la surface de traitement, des buses de pulvérisation (8) pour le gaz liquéfié, à très basse température d'ébullition et une surface de traitement qui fait partie d'un bol vibrant comportant des tamis pour séparer les granulés, les déchets grossiers et la poussière, dispositif caractérisé en ce que la surface de traitement correspond à l'image du jet quant à la forme et aux dimensions, la roue de projection est auto-aspirante et est reliée par un tube d'aspiration (12) au collecteur (13) de granulés et dans la zone d'entrée du tuyau d'aspiration, il est prévu une buse de projection (14) pour le gaz liquéfié, à très basse température d'ébullition.
2. Dispositif selon la revendication 1, caracté- . risé en ce que la buse de pulvérisation (14) est placée sous l'orifice d'entrée du tube d'aspiration, dans son axe et dans le sens de l'écoulement.
3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'entrée du tube d'aspiration est entourée par une buse d'entrée (18) en forme de trémie en formant un volume annulaire pour les granulés en circulation.
EP85110079A 1984-08-18 1985-08-10 Dispositif pour le traitement de surface de pièces devenant cassantes à basses températures Expired EP0171779B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85110079T ATE43085T1 (de) 1984-08-18 1985-08-10 Vorrichtung zur oberflaechenbearbeitung von kaelteversproedbaren werkstuecken.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843430529 DE3430529A1 (de) 1984-08-18 1984-08-18 Vorrichtung zur oberflaechenbearbeitung von kaelteversproedbaren werkstuecken
DE3430529 1984-08-18

Publications (3)

Publication Number Publication Date
EP0171779A2 EP0171779A2 (fr) 1986-02-19
EP0171779A3 EP0171779A3 (en) 1987-05-13
EP0171779B1 true EP0171779B1 (fr) 1989-05-17

Family

ID=6243431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110079A Expired EP0171779B1 (fr) 1984-08-18 1985-08-10 Dispositif pour le traitement de surface de pièces devenant cassantes à basses températures

Country Status (5)

Country Link
US (1) US4637174A (fr)
EP (1) EP0171779B1 (fr)
JP (1) JPS6161766A (fr)
AT (1) ATE43085T1 (fr)
DE (1) DE3430529A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810463A1 (de) * 1988-03-26 1989-10-12 Messer Griesheim Gmbh Verfahren zum entgraten kaelteversproedbarer formteile
TW277020B (en) * 1994-04-22 1996-06-01 Richihil Kk Separating device of blasting particle
CN114274053B (zh) * 2021-12-31 2022-11-01 重庆芯洁科技有限公司 一种适用于异形零部件的喷砂机

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE685138C (de) * 1936-09-09 1939-12-13 Alfred Gutmann Akt Ges Fuer Ma Putzen von Werkstuecken mittels Schleudergutes
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 (de) * 1971-12-02 1973-10-31 Messer Griesheim Gmbh, 6000 Frankfurt Vorrichtung zum Entgraten von Werkstücken
DE7307364U (fr) * 1972-02-29 1973-06-07 L Air Liquide Sa
DE2233111C3 (de) * 1972-07-06 1974-11-28 Hermann 2105 Seevetal Jacob Verfahren und Vorrichtung zum Regenerieren von kunstharzgebundenem Gießereialtsand
GB1486084A (en) * 1975-04-16 1977-09-14 Messer Griesheim Gmbh Apparatus for deburring workpieces
DE2650202A1 (de) * 1976-11-02 1978-05-11 Messer Griesheim Gmbh Vorrichtung zum entgraten von werkstuecken
US4519812A (en) * 1983-10-28 1985-05-28 Aga Ab Cryogen shot blast deflashing system with jointed supply conduit

Also Published As

Publication number Publication date
DE3430529A1 (de) 1986-02-27
ATE43085T1 (de) 1989-06-15
US4637174A (en) 1987-01-20
EP0171779A2 (fr) 1986-02-19
EP0171779A3 (en) 1987-05-13
JPS6161766A (ja) 1986-03-29

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