Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
  • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
  • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
  • B02C13/14—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices
  • B02C13/18—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor
  • B02C13/1807—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate
  • B02C13/1835—Disintegrating by mills having rotary beater elements ; Hammer mills with vertical rotor shaft, e.g. combined with sifting devices with beaters rigidly connected to the rotor the material to be crushed being thrown against an anvil or impact plate by means of beater or impeller elements fixed in between an upper and lower rotor disc
• • 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
  • B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools

Definitions

• the present invention relates to composite moulding practices and to related methods and products including composite sacrificial components.
• composite products including a sacrificial carbide content (e.g.; wear tips in mineral breakers, blade edges for diggers and back hoes, etc.).
• a sacrificial carbide content e.g.; wear tips in mineral breakers, blade edges for diggers and back hoes, etc.
• Such composite products are fabricated.
• Such sacrificial components are to be incorporated in the machine so that erosion under the action of mineral pieces (e.g. rock) is minimised by the presence of a sacrificial tungsten carbide surface.
• Such components include wear tips (see US4662571 ) and backup tips (see US4586663). The nature of such components are described hereinafter by reference to appropriate drawings from the aforementioned patent specifications.
• the present invention recognises for one aspect of the invention the advantages to be derived for such sacrificial components were they to be formed directly into a final configuration as a composite component by a casting process where the carbide material is located in an appropriate mould.
• Composite moulding procedures have previously been disclosed in a number of US patents.
• US Patent 5328776 (Garber et al) discloses a composite casting providing a wear resistant surface by virtue wear resistant elements (e.g. of white iron) being arrayed to present in a carrying ductile matrix alternating surface areas of wear resistant material and the matrix material (e.g. cast steel).
• US Patent 5445916 (Revankar to Deere & Co) discloses a method for impregnating a metal product with a hard wear-resistant surface area (e.g. tungsten carbide, chromium carbide, and the like) on a cast matrix. Such a procedure involves first attaching the wear resistant layer (e.g. in the form of a sintered sheet) onto a mould surface and thereafter casting the matrix metal into the mould.
• US5443916 refers to the use of a carbide/binder/plasticiser mixture to form both a sheet and pins from powders of carbide material. The pins serve the function of better anchoring the patterned surface of carbide powder on the surface of the cooled cast metal matrix.
• a heating process to from 320°C to 340°C is disclosed to remove organic binder and plasticizer of the sheet prior to the casting.
• US Patent 41 19459 (Eckmer et al) refers to carbide particulate being placed in a mould and the mould is then filled with molten iron.
• the invention consists in a method of preparing a mountable sacrificial component, said method comprising the steps of
• said metal carbide mass or masses is or are elongate and are preferably located in the ferrous material so as to extend such that in use they will be presented laterally to the eroding material which is to sacrifice the component.
• said component is a sacrificial component of a mineral breaker.
• transition metal is tungsten or chromium (preferably tungsten).
• the invention consists in a method of preparing a mountable sacrificial component, said method comprising the steps of
• said metal carbide mass or masses is or are elongate and are preferably located in the ferrous material so as to extend such that in use they will be presented laterally to the eroding material which is to sacrifice the component.
• said component is a sacrificial component of a mineral breaker (preferably of a BARMACTM type).
• the bond is substantially fully encompassing of the tungsten carbide mass(es).
• said tungsten carbide mass(es) are elongate.
• said tungsten carbide masses are shaped forms and are not particles e.g., such as might formed by breaking, crushing or the like.
• said elongate mass(es) are cylindrical or rectanguloid in shape.
• two aligned elongate tungsten carbide masses are positioned to have a favoured sacrificial zone in use (after initial erosion of some encompassing iron containing material) which is initially away from the outer ends of the aligned masses, thereby to leave (in use) each such outer end at least to some extent encompassed by iron material even as (in use) the other end of each tungsten carbide mass is subject to erosion.
• said pretreatment is by heating to at least 150°C (preferably 150°C to 200°C).
• said tungsten carbide mass(es) is at less than 150°C at the time of the said filling of said mould e.g. preferably is at ambient temperature(s).
• said positioning is in a sand mould (preferably using the green sand mould procedure) (preferably including a binder of, e.g., clay and/or a resin) using wire chaplets or equipment (preferably wire chaplets (e.g. of the shape described hereafter) of a medium carbide carbon spring steel).
• a sand mould preferably using the green sand mould procedure
• wire chaplets or equipment preferably wire chaplets (e.g. of the shape described hereafter) of a medium carbide carbon spring steel.
• said chaplets are as hereinafter described with reference to the drawings.
• the positioning of the carbide mass or carbide masses within the mould is by use of a procedure whereby a locating print is provided in the drag mould which assists carbide location, part of such locating print providing a "window” to the carbide material in the finally moulded article away from a region requiring the bond between the ferrous material and the carbide material.
• a locating print is provided in the drag mould which assists carbide location, part of such locating print providing a "window” to the carbide material in the finally moulded article away from a region requiring the bond between the ferrous material and the carbide material.
• said tungsten carbide mass(es) are embedded in a plate like form of the iron containing material but at a zone of increased thickness thereof.
• the sacrificial zone of the component has about 4mm or greater of iron containing material over the tungsten carbide mass(es).
• said plate like form included a moulded opening or moulded openings to allow bolt or the like attachment thereof into a mineral breaking machine (e.g. a BARMACTM machine of Svedala New Zealand Limited).
• said openings are in a zone not of increased thickness and said openings are aligned to receive bolts or the like normal to the longitudinal axes of said elongate tungsten carbide masses yet spaced therefrom and aligned in a line parallel to the alignment axis of longitudinal axes of said tungsten carbide masses.
• said component is a wear tip and said iron containing material is a nickel chromium alloy cast iron (e.g. Nihard).
• said component is a backup tip (see US Patent 4586663) as to the distinction between wear tips and backup tips) and the iron containing material is spheroidal graphite iron (i.e. "S.G. Iron”).
• the tungsten carbide mass or masses are those available packaged under the trademark SANDVIKTM.
• the iron containing material is more ductile than the tungsten carbide mass(Es) and less brittle (e.g. if S.G. Iron, can be stretched about 7%, and, if Nihard, can be stretched up to about 1%).
• the invention consists in a sacrificial component produced by a process of the present invention.
• the invention consists in a mineral breaker including a sacrificial component as aforesaid.
• the invention consists in a wear tip or back up tip for a mineral breaker having at least one hard transition metal carbide shaped body at least substantially fully embedded by casting a metal matrix (preferably S.G. Iron or Nihard or High Chromium Iron about the body or bodies) as a metal carrier for the carbide body or bodies and adapted, by virtue of its to be mounted position with respect to the loci of mineral piece movement to erode in part to reveal a sacrificial surface area of the carbide body or bodies to subsequently be eroded by mineral pieces in use.
• a metal matrix preferably S.G. Iron or Nihard or High Chromium Iron about the body or bodies
• Figure 1 is a front view of a wear tip or a back up tip for a BARMACTM type machine previously described, such a wear tip or back up tip being mountable using the openings shown through the ferrous body
• Figure 2 is the reverse view of the article of Figure 1 showing the "windows" which show the outer regions of the elongate carbide pieces.
• Figure 3 is an end view AA of the article of Figure 1 showing in broken outline the inner extent of the windows depicted in Figure 2,
• Figure 4 is a transparent view of the article of Figures 1 and 2 or a pattern useful for would preparation purposes showing how preferably two elongate carbide rods are positioned in the ferrous mass,
• Figure 5 is a view of the end BB in a similar manner to that of Figure 3,
• Figure 6 is a perspective view of the transparent article of Figure 4.
• Figure 7 shows a wire chaplet type arrangement that can be used to secure a rod, if the window location feature of the article depicted in the drawings or a pattern such as depicted in Figures 4, 5 and 6, is not used in a moulding process.
• an elongate rod 1 is used in an aligned pair in the article extending to a region 2 where they butt and which preferably will be the region of maximum erosion in use of a wear tip or back up tip of the type depicted.
• the ferrous mass region 3 includes fixing holes 4 and of course the strengthened region 5 in which the rods 1 are embedded.
• Windows 6 are provided such that when preparing the drag mould of a green sand mould upstands in the sand are printed onto which the aligned tungsten carbide rods can be positioned to span there between. When the mould is closed with the cope mould part, a mould cavity about the positioned rods will leave only a small exposure of the tungsten carbide material as shown in the transparency of Figure 6.
• Figure 7 shows a wire chaplet of a kind having loops curved in planes that are normal with respect to each other such that one loop, with its extended distal end, can be positioned on the sand surface of a drag mould to leave upstanding the other loop into which an end of a horizontal rod of tungsten can be inserted.
• any cross section for the tungsten carbide or other carbide pieces may be utilised although for ease of description reference throughout in respect of the drawings has been to an elongate rod like material.
• the techniques of the present invention can provide components for many uses, eg, back hoes, excavators, etc.

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• Engineering & Computer Science (AREA)
• Food Science & Technology (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Powder Metallurgy (AREA)
• Crushing And Grinding (AREA)
• Manufacture Of Alloys Or Alloy Compounds (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19927327

Family Applications (1)

Country Status (8)

Cited By (4)

Families Citing this family (1)

Citations (6)

• 1999
  • 1999-06-10 NZ NZ33621799A patent/NZ336217A/en unknown
• 2000
  • 2000-06-09 AU AU49602/00A patent/AU4960200A/en not_active Withdrawn
  • 2000-06-09 EP EP00931772A patent/EP1200192A1/en not_active Withdrawn
  • 2000-06-09 BR BR0011736-6A patent/BR0011736A/pt not_active Application Discontinuation
  • 2000-06-09 CA CA002374230A patent/CA2374230A1/en not_active Abandoned
  • 2000-06-09 JP JP2001502984A patent/JP2003501268A/ja active Pending
  • 2000-06-09 WO PCT/NZ2000/000094 patent/WO2000076666A1/en not_active Application Discontinuation
• 2002
  • 2002-01-09 ZA ZA200200191A patent/ZA200200191B/en unknown

Patent Citations (6)

Non-Patent Citations (1)

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