WO2005039826A1 - Aubes de projection et roues de projection - Google Patents

Aubes de projection et roues de projection Download PDF

Info

Publication number
WO2005039826A1
WO2005039826A1 PCT/GB2004/004339 GB2004004339W WO2005039826A1 WO 2005039826 A1 WO2005039826 A1 WO 2005039826A1 GB 2004004339 W GB2004004339 W GB 2004004339W WO 2005039826 A1 WO2005039826 A1 WO 2005039826A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
throwing
ceramic
throwing wheel
blades
Prior art date
Application number
PCT/GB2004/004339
Other languages
English (en)
Inventor
Tony Philippson
Original Assignee
Surface Preparations Limited
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 Surface Preparations Limited filed Critical Surface Preparations Limited
Publication of WO2005039826A1 publication Critical patent/WO2005039826A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/02—Casting in, on, or around objects which form part of the product for making reinforced articles
    • 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
    • B24C5/062—Rotor blades or vanes; Locking means therefor
    • 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
    • B24C5/068—Transferring the abrasive particles from the feeding means onto the propeller blades, e.g. using central impellers
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C6/00—Coating by casting molten material on the substrate

Definitions

  • This invention relates to throwing blades for a throwing wheel, to a throwing wheel and to methods of manufacturing a throwing blade.
  • Throwing wheels are used in connection with abrasion machines to propel particulate abrasive material on to a surface or surfaces.
  • abrasive the abrasive material may in some instances, have an effect other than a primarily abrasive effect, for example, a cleaning effect.
  • Such machines may be static, in which case an article to be treated is placed in an enclosure into which material is propelled, or mobile, for example, as shown and described in GB-A-1575477, GB-A-1575478 and GB-A-1542495.
  • the throwing wheels to which the invention relates are mounted to a machine and are driven for rotation by a drive rotor of the machine.
  • the wheels have blades which act to propel the particulate abrasive material.
  • Known throwing wheels include wheels with parallel spaced front and back plates in between which individually demountable blades are secured with a demountable central impeller which directs the abrasive material onto the blades. Examples of this type of throwing wheel are shown in GB-A-1328417 and US-A-3785105.
  • One- piece cast wheels are also known with integral blades and an impeller such as that shown in GB-A-218179.
  • the blades and impellers of such throwing wheels are subject to wear in use. Accordingly, these components require periodic replacement and it is desirable therefore to minimise wear in order to extend the working life of the machine between periods of maintenance.
  • the blades and impellers are manufactured using a casting process using 25% chrome iron.
  • these components may also be manufactured using tungsten carbide.
  • this material is very brittle, having a low tensile strength, and at the same time is expensive.
  • machines using components made from this material have a limited and relatively narrow use since they may only be used in environments in which the blades are safe from impact from foreign materials which would cause the blade to shatter. Accordingly, there is a need for a hard, relatively cheap and relatively shatter-proof blade for throwing wheels.
  • a blade for a throwing wheel comprising an outer metallic frame and an inner ceramic strengthening member.
  • a method of manufacturing an improved blade for a throwing wheel comprising casting a metallic blade around a ceramic core.
  • a throwing wheel including a plurality of the blades of the first aspect radially mounted around a generally central hub.
  • an impeller for a throwing wheel including an enclosed core of ceramic material.
  • Figure 1 is an elevation of a throwing blade in accordance with the invention
  • Figure 2 is a section along line B-B of Figure 1 ;
  • Figure 3 is a section along line A-A of Figure 1 ;
  • Figure 4 is a section along line C-C of Figure 1 ;
  • Figure 5 is an elevation of an impeller for receiving the blade of Figure 1 ;
  • Figure 6 is a section along line A-A of Figure 5;
  • FIG 7 is a section along line C-C of Figure 6, and Figure 8 is a section along line B-B of Figure 7.
  • a blade has a face 2 upon which abrasive material impacts as the throwing wheel rotates. The blade acts to direct the abrasive material radially outwardly from the wheel.
  • the blade also has a foot 4 which is adapted to engage the hub or impeller as is known in the art.
  • the blade has a central ceramic core 6 which is harder than the material of an outer metallic frame 8 within which the core 6 is contained.
  • the frame 8 acts to strengthen the ceramic core 6 so that it does not shatter or fracture.
  • the ceramic core 6 is harder wearing than the material (for example chrome iron) used to manufacture the frame 8.
  • the face 2 is abraded by the abrasive material as is known in the art. This typically removes the thin layer of metallic material covering the ceramic core while still leaving structurally significant portions of the frame 8 intact. Abrasion of the ceramic core is much slower than the metallic frame and is therefore much slower than that of a conventional throwing blade.
  • Blades of this type may be used with the multi-part throwing wheel of our co-pending application published as GB-A-2372721.
  • the blade described above may be used with a more conventionally shaped impeller as shown in Figure 5.
  • the use of a ceramic core 10 helps prevent wear on the impeller.
  • Impellers typically have slots allowing the egress of abrasive material from a central feed at the point marked 12. The slots are aligned with the face 2 of the blades so that material is thrown out of the impeller and then directed by the blade in a generally radial direction.
  • the pillars which separate the slots (marked 14 on Figure 6) are themselves subject to wear and thus these may also be made more wear resistant by incorporating ceramic material within .
  • the ceramic material is preferably of a cellular or matrix form and is sufficiently heat resistant to maintain its shape at the casting temperatures of the metallic frame. This means that the impeller and/or blade may be made using casting techniques by inserting the ceramic material ready formed in shape, into the mould prior to casting.
  • An examples of a suitable ceramic is alumina (A1 2 O 3 ).
  • a blade and impeller may be manufactured which provides similar resistance to tungsten carbide but at reduced cost and increased resistance to shattering.
  • the ceramic material may be positioned in the mould such that even before use of the blade, the ceramic blade is present on the surface of the blade.
  • a similar approach may be taken with the impeller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Selon cette invention, le fait d'incorporer un noyau céramique (6), de préférence de nature cellulaire, dans une aube de projection et/ou une hélice de roue de projection confère à l'aube et/ou à l'hélice une plus grande résistance à l'abrasion et permet de réduire la tendance du matériau céramique à éclater. Cette invention permet ainsi d'obtenir une roue de projection présentant des performances semblables à celles de roues à base de carbure de tungstène ainsi qu'une plus grande résistance à l'éclatement avec un coût réduit.
PCT/GB2004/004339 2003-10-14 2004-10-13 Aubes de projection et roues de projection WO2005039826A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0324042.1 2003-10-14
GB0324042A GB2419556A (en) 2003-10-14 2003-10-14 A blade for a throwing wheel with an inner ceramic member

Publications (1)

Publication Number Publication Date
WO2005039826A1 true WO2005039826A1 (fr) 2005-05-06

Family

ID=29559259

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2004/004339 WO2005039826A1 (fr) 2003-10-14 2004-10-13 Aubes de projection et roues de projection

Country Status (2)

Country Link
GB (1) GB2419556A (fr)
WO (1) WO2005039826A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH349186A (de) * 1957-03-05 1960-09-30 Fischer Ag Georg Wurfschaufel an Schleuderstrahlmaschine
GB892772A (en) * 1958-08-06 1962-03-28 Pangborn Corp Particle throwing apparatus
DE9105266U1 (de) * 1991-04-29 1991-06-27 Rothe, Rolf, 6143 Lorsch Schleuderrad - Schaufel

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3600677A1 (de) * 1986-01-13 1987-07-16 Rheinhuette Vorm Ludwig Beck G Schichtkoerper, insbesondere aus siliziumcarbid und nickel
US4849266A (en) * 1987-11-03 1989-07-18 Lanxide Technology Company, Lp Compliant layer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH349186A (de) * 1957-03-05 1960-09-30 Fischer Ag Georg Wurfschaufel an Schleuderstrahlmaschine
GB892772A (en) * 1958-08-06 1962-03-28 Pangborn Corp Particle throwing apparatus
DE9105266U1 (de) * 1991-04-29 1991-06-27 Rothe, Rolf, 6143 Lorsch Schleuderrad - Schaufel

Also Published As

Publication number Publication date
GB2419556A (en) 2006-05-03
GB0324042D0 (en) 2003-11-19

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