EP0119399B1 - Schleuderrad zum Abstrahlen von Strahlmitteln auf zu bearbeitende Werkstücke - Google Patents

Schleuderrad zum Abstrahlen von Strahlmitteln auf zu bearbeitende Werkstücke Download PDF

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Publication number
EP0119399B1
EP0119399B1 EP84100600A EP84100600A EP0119399B1 EP 0119399 B1 EP0119399 B1 EP 0119399B1 EP 84100600 A EP84100600 A EP 84100600A EP 84100600 A EP84100600 A EP 84100600A EP 0119399 B1 EP0119399 B1 EP 0119399B1
Authority
EP
European Patent Office
Prior art keywords
blasting
centrifugal
rotation
plane
casting blades
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
EP84100600A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0119399A2 (de
EP0119399A3 (en
Inventor
Peter Grund
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 AT84100600T priority Critical patent/ATE37314T1/de
Publication of EP0119399A2 publication Critical patent/EP0119399A2/de
Publication of EP0119399A3 publication Critical patent/EP0119399A3/de
Application granted granted Critical
Publication of EP0119399B1 publication Critical patent/EP0119399B1/de
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
    • B24C5/00—Devices or accessories for generating abrasive blasts
    • B24C5/06—Impeller wheels; Rotor blades therefor

Definitions

  • the invention relates to a centrifugal wheel for blasting abrasives onto workpieces to be machined.
  • the blasting technique has been known for a long time. It is used for deburring molded parts, for roughening, compacting, rust removal, descaling, stripping and stripping surfaces, for separating different materials, peeling food and shredding. Some blasting treatments are only possible with additional heat or cold supply, e.g. B. flame blasting, cold deburring of elastomers, stripping paint hanger, transport transducers and gratings, cold crushing and cold peeling of food. A large beam area with the same kinetic beam energy and beam density is required for all applications.
  • centrifugal wheels have a relatively simple structure and in principle consist of two parallel disks, between which throwing blades are arranged.
  • the throwing blades are strips arranged in the radial direction, the centrifugal surface of which is flat or at most weakly profiled.
  • the inner surfaces of the two disks are shaped so that they form a V-shaped gap and thus increase their distance from one another outwards from the center. This determines an angle a between the disks.
  • the blasting agent is preferably blasted in the plane of rotation of the centrifugal wheel, while radiance and radiation energy decrease sharply to the left and right of the plane of rotation.
  • the blasting pattern of the entire surface exposed to the blasting agent is therefore very uneven. While a very intensive blasting effect and frequency of impact are achieved in the middle of the surface, they drop sharply towards the edges. This is very disadvantageous for the processing of sensitive workpieces and for the blasting of surfaces, because on the one hand there is a lot of scrap, i.e. Workpieces that have been irradiated too strongly or unevenly, on the other hand, many workpieces have to be reworked, which were namely only insufficiently exposed to the blasting effect. This is also disadvantageous in all blasting treatments which are carried out with the supply of heat or cold, because in this case the heat or cold is poorly used.
  • the workpieces have to be cooled much more, for example when the cold is supplied, than is necessary with a uniform blasting effect.
  • Devices are therefore used in which the irradiated workpieces are moved and circulated during the blasting.
  • Such devices are known, for example, from DE-C-2 516 721 and DE-A-2 650 202. These known devices ensure that the workpieces are circulated and their surfaces are thereby exposed to the blasting agent evenly.
  • it cannot be achieved that all workpieces are moved uniformly through zones of high radiation density and radiation energy and low radiation density and radiation energy. Apart from this, such work movement of the work pieces is not possible with many work pieces, especially with large areas.
  • DE-A-3 110 062 shows a centrifugal wheel in which the throwing blades are inclined in pairs against the plane of rotation.
  • the blasting medium is therefore blasted onto a wider area and the center of the irradiated area is no longer subjected to as much pressure.
  • the intensity of the incident beam particles is still different in the middle and in the edge zones of the irradiated area.
  • a wider jet pattern and a uniform intensity are to be achieved with the aid of a centrifugal wheel which has throwing blades with special control surfaces.
  • the throwing surfaces are graded by the control surfaces, which can lead to severe wear at the locations of the control surfaces which the blasting particles impinge on.
  • the invention is therefore based on the object of providing a centrifugal wheel for blasting abrasive material on workpieces to be machined, which makes it possible not only to broaden the blasting surface while maintaining the conventional, wear-resistant throwing blade type and the blasting density in the middle and in the peripheral areas of the blasting surface approach, but also to make the blasting intensity of the individual blasting material particles largely the same in all areas of the blasting surface.
  • a jet pattern is obtained with the centrifugal wheel according to the invention, which is, so to speak, equalized.
  • the centrifugal wheel according to the invention which is, so to speak, equalized.
  • the high concentration of the blasting medium in the center of the irradiated area as is known per se, is avoided by blasting a large part of the blasting medium to the sides of the irradiated area.
  • An additional advantage here is that the width of the irradiated surface is increased under otherwise identical conditions, since the ejection angle is increased as a result of the curved throwing blades.
  • the uniform blasting effect also results in more economical use of heat or cold carriers, provided that these are also introduced through the centrifugal wheel.
  • the concave design of the trailing edge according to the invention ensures that the speed component perpendicular to the irradiated surface is the same everywhere. This is particularly important when blasting large workpieces if their surface is to have the most uniform possible appearance.
  • the centrifugal wheel according to the invention has only the smallest possible number of throwing blades, namely six. Since the centrifugal wheels are often manufactured as welded constructions, this is the cheapest solution. However, it is completely sufficient for most applications. In special cases, however, centrifugal wheels with a larger number of throwing blades can also be used.
  • the centrifugal wheel shown in FIGS. 1-4 consists of the two disks 4 and 5, between which the throwing blades 1, 2, 3 are arranged, and the hub 6.
  • the direction of rotation of the centrifugal wheel is indicated by arrows 7.
  • the centrifugal wheel has three different types of throwing blades, which are referred to below for distinction as straight throwing blades 1, right throwing blades 2 and left throwing blades 3. As can be seen from FIG. 2, the throwing blades of one type are opposite each other. An irradiated surface 8 is additionally shown in FIG. 1.
  • the blasting agent passes through the opening opposite the hub 6 into the centrifugal wheel and is gripped by the centrifugal surfaces of the throwing blades.
  • the straight throwing blades 1 have the centrifugal surfaces 9
  • the right throwing blades 2 have the centrifugal surfaces 10
  • the left throwing blades 3 have the centrifugal surfaces 11.
  • the disks 4 and 5 form a V-shaped gap which widens from the inside to the outside.
  • the inner surfaces of the disks are thus at an angle a to each other.
  • the straight throwing blades 1 are designed in a known manner as straight strips. However, they can also be profiled differently, all known constructions are suitable for this.
  • the straight throwing blades 1 preferably hurl the blasting medium in the direction of the plane of rotation 12.
  • the irradiated surface 8 is therefore preferably hit in the middle, while its peripheral areas are only insufficiently loaded with blasting medium.
  • the centrifugal surfaces of the other throwing blades are concave.
  • the axes of curvature of the centrifugal surfaces are shown in the drawings by lines i2-a2 and i3-a3.
  • "i” stands for inside and "a” for outside, these are the points of intersection of the axes of curvature through the inner and outer cylindrical rotating surfaces of the centrifugal wheel.
  • the curvature axes i2-a2 and i3-a3 are shown in spatially correct arrangement in FIG. 3, they are folded into the sectional plane in FIG. 1.
  • the axes of curvature are inclined at an acute angle to the plane of rotation 12, but the acute angle is greater than half the angle a.
  • the course of the axes of curvature i2-a2 and i3-a3 is a mirror image.
  • the curvature of the centrifugal surfaces means that the throwing blades 2 preferably radiate the blasting medium onto the irradiated surface 8 at an acute angle to the plane of rotation 12.
  • the throwing blades 3 preferably radiate the blasting medium to the other side of the surface 8.
  • the ejection angle is greater than the angle a determined by the V-shaped gap between the disks 4 and 5, as in particular from Fig. 1 can be seen.
  • the arrows 13 represent the trajectory of the blasting agent on the surface 8.
  • the larger ejection angle corresponds approximately to the angle which the two axes of curvature i2-a2 and i3-a3 enclose.
  • the trailing edges 14, 15, 16 of the throwing blades 1, 2, 3 according to the invention have a concave shape directed towards the axis of rotation. This serves to balance the impact energy of the blasting medium. Effective for the blasting effect is above all the force component acting perpendicularly on the surface 8.Because of the larger diameter, a blasting agent particle thrown off the edge of the trailing edge 14 has a higher ejection speed than a particle thrown off the center of the trailing edge 14 because of the concave shape in the middle the discharge diameter is smaller.
  • the velocity and thus force components directed perpendicular to the surface 8 are, however, at least approximately the same in both cases.
  • the centrifugal wheel according to the invention can of course also be used in devices in which the blasting medium is deflected by reflectors, as shown, for example, by DE-A-2 650 202.
  • the conical reflector shown there can also be a convex or obtain concave curvature to optimize the abrasive density.
  • reflectors can also be arranged below the irradiated work surface, which hurl the blasting medium flying through the openings back onto the workpiece.
  • the throwing blades can be additionally armored by means of build-up welding.
  • the optimal course of the concave curvature of the centrifugal surfaces of the throwing blades according to the invention generally has to be determined empirically.
  • the main influencing factors here are, above all, the type of blasting agent used, e.g. B. steel or plastic particles and their outer shape, and the rotational speed of the centrifugal wheel.
  • the surfaces of curvature can also be slightly curved in themselves, so that the centrifugal surfaces are concavely curved in two planes.
  • the abrasive particles can additionally be accelerated or decelerated to influence the blasting effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Nozzles (AREA)
EP84100600A 1983-03-19 1984-01-20 Schleuderrad zum Abstrahlen von Strahlmitteln auf zu bearbeitende Werkstücke Expired EP0119399B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100600T ATE37314T1 (de) 1983-03-19 1984-01-20 Schleuderrad zum abstrahlen von strahlmitteln auf zu bearbeitende werkstuecke.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833309941 DE3309941A1 (de) 1983-03-19 1983-03-19 Schleuderrad zum abstrahlen von strahlmitteln auf zu bearbeitende werkstuecke
DE3309941 1983-03-19

Publications (3)

Publication Number Publication Date
EP0119399A2 EP0119399A2 (de) 1984-09-26
EP0119399A3 EP0119399A3 (en) 1986-06-04
EP0119399B1 true EP0119399B1 (de) 1988-09-21

Family

ID=6193991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100600A Expired EP0119399B1 (de) 1983-03-19 1984-01-20 Schleuderrad zum Abstrahlen von Strahlmitteln auf zu bearbeitende Werkstücke

Country Status (5)

Country Link
US (1) US4521996A (ja)
EP (1) EP0119399B1 (ja)
JP (1) JPS59187466A (ja)
AT (1) ATE37314T1 (ja)
DE (1) DE3309941A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0230219Y2 (ja) * 1985-08-10 1990-08-14
US4646483A (en) * 1985-10-07 1987-03-03 Pangborn Corporation Vanes for abrasive blasting wheels
US4651477A (en) * 1986-03-10 1987-03-24 Brucher Melvin J Wheel assembly for an abrasive blasting apparatus
DE3612586A1 (de) * 1986-04-15 1987-10-29 Messer Griesheim Gmbh Verfahren zum entfernen von auf der oberflaeche von werkstuecken haftenden materialresten
BE1002563A3 (fr) * 1988-10-19 1991-03-26 Rutten Leon Turbine de grenaillage.
US5239786A (en) * 1992-04-22 1993-08-31 Pangborn Corporation Inside pipe cleaner
US5392997A (en) * 1993-12-08 1995-02-28 Comensoli; Inaco Non-impact pulverizer and method of using
DE4421218B4 (de) * 1994-06-17 2004-11-25 Linde Ag Formteilentgratung mittels eines Schleuderrades
AU730325B2 (en) * 1996-09-25 2001-03-01 Powderject Vaccines, Inc. Gas-driven particle delivery device
US6764390B2 (en) 2001-11-28 2004-07-20 International Surface Preparation Group, Inc. Centrifugal throwing vane

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2217231A (en) * 1938-04-04 1940-10-08 Morse Bros Machinery Company Rubber impeller
US2314069A (en) * 1938-05-31 1943-03-16 Mills Alloys Inc Abrasive blast
US2493215A (en) * 1947-03-06 1950-01-03 American Wheelabrator & Equip Surface treating device
US3242615A (en) * 1963-08-05 1966-03-29 Pangborn Corp Apparatus for widening the abrasive blast stream of abrasive blasting wheels
DE1259221B (de) * 1964-09-19 1968-01-18 Helmut H Trampnau Wurfschaufel an einem Schleuderrad zum Putzen von Werkstuecken
US3348339A (en) * 1965-05-24 1967-10-24 Pangborn Corp Abrasive blasting wheels and vanes
US3694963A (en) * 1970-03-25 1972-10-03 Wheelabrator Frye Inc Centrifugal blasting wheel
CH551846A (de) * 1973-05-16 1974-07-31 Fischer Ag Georg Schleuderstrahlvorrichtung.
US3921337A (en) * 1974-05-17 1975-11-25 Riichi Maeda Centrifugal blasting apparatus
US3936979A (en) * 1974-10-10 1976-02-10 Benfur Engineering Company Particle-releasing mounting system for the blades of blasting machines
JPS5525555A (en) * 1978-08-12 1980-02-23 Hitachi Ltd Impeller
DE3110062A1 (de) * 1981-03-16 1982-09-30 Fa. Erwin Wacker, 5960 Olpe Ein schleuderrad aufweisende einrichtung zum beaufschlagen von werkstuecken mit einem strahlmittel

Also Published As

Publication number Publication date
DE3309941A1 (de) 1984-09-20
ATE37314T1 (de) 1988-10-15
EP0119399A2 (de) 1984-09-26
JPS59187466A (ja) 1984-10-24
US4521996A (en) 1985-06-11
EP0119399A3 (en) 1986-06-04

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