AU2011200813A1

AU2011200813A1 - Multi shaped wear resistant plate

Info

Publication number: AU2011200813A1
Application number: AU2011200813A
Authority: AU
Inventors: Stephen Kerr Davis; Joseph Ferencz; Jillian Gaye Werner
Original assignee: CQMS Pty Ltd
Current assignee: CQMS Pty Ltd
Priority date: 2004-05-28
Filing date: 2011-02-25
Publication date: 2011-03-17
Also published as: WO2005115662A1; AU2005247519B2; AU2005247519A1

Description

P/00/011 Regulation 3.2 AUSTRALIA Patents Act 1990 ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title: "MULTI SHAPED WEAR RESISTANT PLATE" The following statement is a full description of this invention, including the best method of performing it known to me/us: 1 TITLE MULTI SHAPED WEAR RESISTANT PLATE TECHNICAL FIELD This invention relates to a wear resistant plate, more particularly to a wear 5 resistant plate for use in the mining industry and the conveying, grading, screening of material and other high wear areas. BACKGROUND ART Conventional wear resistant plates used in the mining and construction Industries are made by hot rolling processes which limits the size of the plates to be used. 10 That is plates are produced and sold in standard sheet sizes and then further processed by the steel distributor or end user. These plates are referred to as the family of AR plates (Abrasion Resistant). This involves having to hold large stocks of various thicknesses, sizes etc, and then having staff, equipment to process the plates into suitable sizes for use as 15 liners or shaped wear plates for final use into chutes, bins, hoppers, and any machinery that requires wear plate protection. Metallurgy has advanced to the point where there are numerous high hardness, wear resistant plates on the market. The same applies if liners and shaped wear plates have to be fabricated into 20 welded shapes or where a process involves the deposition of hard faced layers, using an automated welding process to form a hard wear resistant layer. These plates are referred to as the family of Cr/C (chrome/carbide) weld overlay plates. Bi-metallic abrasion resistant wear plates are known which rely on the 25 combination of a cast, high alloy material which possesses the correct composition, a hardness value in excess of 700 Brinel and a micro-structure to 2 achieve an extremely high hardness wear plate which is then vacuum bonded to steel backing plate for use in mining/construction industry for wear protection. Thermal cutting of many of these high resistant wear plates on the market requires a great deal of care and handling. Some degree of pre/post heating, to 5 avoid cracking and ultimate premature failure of these liners cut from stock steel plates, is essential. These plates invariably require special cutting processes such as oxy acetylene, arc-air, plasma arc, high velocity abrasive water cutting, machining, slotting and saw cutting. All these processes require high equipment costs and 10 skilled labour. The casting process offers distinct advantages over the rolled processed plate and plates formed by automated weld overlay process. DISCLOSURE OF THE INVENTION It is an object of this invention to overcome one or more of the above problems 15 by a method and product to provide smaller abrasive resistant products from a larger abrasive resistant product. A further object of the invention is to provide an abrasive resistant product being a laminate of a steel plate supporting a cast abrasive resistant layer, whereby the abrasive resistant product can be broken into desired shapes. 20 A still further object of the invention is to provide a cast abrasive resistant plate which can be broken into smaller abrasive resistant plates. Thus there is provided according to the invention a method of providing abrasive resistant elements including the steps of producing an abrasive resistant plate, the plate having incorporated in the upper and lower surfaces 25 means whereby the plate can be divided into desired shapes for incorporation in areas where the shape is required to provide an abrasive resistant surface. Also there is provided a method of providing a repair to an area of a structure having an abrasive resistant material Including the steps of removing the area to be repaired, providing an abrasive resistant plate having a cast abrasive surface 3 bonded to a steel carrier plate, providing means to divide the plate into a shape required to repair the structure and attaching the shape to the structure. Also there is provided according to the Invention an abrasive resistant plate marked into selected shapes by grooves on the upper and lower surfaces 5 thereof whereby the plate can be divided into selected shapes by dividing the plate along selected grooves to produce the required shape of abrasive resistant material. Preferably the abrasive resistant plate comprises a steel backing plate to which is bonded a cast plate of abrasive resistant material. 10 Preferably the abrasive resistant plate Is provided with grooves on the cast plate opposite notches on the steel plate to facilitate separation into the predetermined shape. Preferably the steel plate has notches opposite the grooves on the cast plate. Preferably the steel plate has a profile slot cut Into the steel plate opposite to 15 the cast groove In the cast abrasive material along at least part of the length of the groove in the cast abrasive resistant cast plate. BRIEF DESCRIPTION OF THE INVENTION In order to more fully describe the invention, reference will now be made to the accompanying drawings In which: 20 Figure 1 is a plan and elevation view of one form of the Invention, Figure 2 is a plan, elevation and reverse elevation view of a further form of the Invention, Figure 3 shows a further form of the invention, Figure 4 is still a further form of the invention, and, 25 Figure 5 shows further alternate shapes which may be produced.

4 BEST MODE FOR CARRYING OUT THE INVEN TION Referring to Figure 1 the abrasive resistant member 1 is a laminate of abrasive resistant white iron 2 bonded to a mild steel plate 3. Grooves 4 are cast into the surface of the white Iron and notches 5 are formed in the lower surface of the 5 steel plate directly opposite the grooves 4. The plate can be used in its entirety, or the plate can be broken into various shapes. Thus the triangular corner pieces can be broken off leaving the smaller centre square to be used. Alternately the plate can be broken into eight triangular pieces, or again can be broken along a centre line to form two 10 rectangular pieces. The shape and layout of the cast grooves are critical in ensuring the plates will break and fracture cleanly. The cast grooves also have the correspondingly matched machined or slotted or flame cut notch In the steel backing plate to ensure the plates break cleanly. 15 The plates are preferably welded to the metal structure to be protected by stitch welding the steel backing plate to the metal structure. The stitch welding ensures that the steel backing plate does not become too hot which can be detrimental to the plate. Also the stitch weld should not touch the cast white iron. Additionally the plates can be attached by way of Arc Studs that are welded to 20 the backing plate. The cast-In groove size is determined by the plate size, plate thickness and the final shapes required. In Figure 2 the steel plate 3 is profile cut 6 opposite the grooves 4. The profile cut 6 extends through the thickness of the steel plate 3, and terminates 7 25 adjacent the sides of the steel plate. The cuts 6 which extend toward the centre of the plate also do not meet each other and terminate at 8. Thus when breaking or fracturing the plate the steel plate only has to be broken to the terminal portions 7 and 8. Figure 3 is a further alternative of the plate of Figure 2, with the addition of 30 pockets 9 positioned midway along the grooves 4 and the profile cuts 6 for additional weld to be added if desired.

5 In Figure 4 the grooves 10 are closely spaced and extend across the cast iron from one side to the other to intersect the grooves extending at right angles across the cast iron plate thus resulting in a plurality of square pieces when broken. However the profile cuts opposite the grooves do not in all instances 5 extend all the way across the steel plate. The profile cuts 11 extend from adjacent one edge of the plate to adjacent the opposite edge. However the profile cuts 12 at right angles to the profile cuts 11 extend from alternate profile cuts 11 and terminate adjacent the profile cuts 11. Thus in this way the plate can be broken Into a number of smaller square pieces, or can be broken into a row 10 of square abrasive members, or any desired arrangement of square abrasive members. Figure 5 shows a range of alternate shapes into which the plate can be broken by appropriate grooves in the cast Iron and corresponding notches or profile cuts in the steel plate. 15 In all instances while examples of the profile cuts have been described it is to be realised the profile cuts in some instances need not terminate adjacent the edges of the plate or at positions along the profile cut. For any given size of cast wear plate (up to half a meter square) any flat shaped liner, be it square, rectangular, triangular, circular, semi-circular, rounded, oblong 20 can be achieved using cast-in notches, to suit customer needs. The invention offers the client the opportunity to reduce inventory, equipment and labour required to process high abrasion resistant wear plates. As shown all the plates will have a cast bevel on their edges to prevent chipping/spalling. Thus the grooves in the cast plate are V shaped to produce a 25 bevel on the edges of the pieces when broken from the main plate. However the grooves do not extend through the thickness of the cast plate to ensure that the plate retains sufficient strength that it will not break with regular handling. Although various forms of the invention have been described in some detail, it is to be realised the invention is not to be limited thereto but can include variations 30 and modifications falling within the spirit and scope of the invention.

Claims

1. An abrasive resistant main plate having an abrasive resistant member and an opposite backing member, a plurality of fracturing means on said abrasive resistant member, and corresponding fracturing means on said 5 backing member opposite said fracturing means on said upper abrasive resistant member to provide smaller portions of abrasive resistant plates whereby the said abrasive resistant main plate may be fractured along one or more of the said fracturing means to provide one or more smaller abrasive resistant plates. 10

2. An abrasive resistant main plate as defined in claim 1 characterised in that the abrasive resistant member Is a cast white iron plate and the backing member is a steel plate metallurgically bonded to the cast white iron plate.

3. An abrasive resistant main plate as defined in claim 2 characterised in that the fracturing means in the cast white iron plate is a groove or notch in the 15 surface of the cast white iron plate.

4. An abrasive resistant main plate as defined In claim 2 characterised In that the fracturing means in the metal plate is a notch extending into the surface of the metal plate.

5. An abrasive resistant main plate as defined in claim 2 characterised in 20 that the fracturing means in the metal plate is a cut extending into metal plate.

6. An abrasive resistant main plate as defined in claim 2 characterised In that the fracturing means in the metal plate are cuts extending through the thickness of the metal plate.

7. An abrasive resistant main plate as defined in claim 3 characterised in 25 that the grooves or notches in the cast white iron plate extend right across the surface of the cast white iron plate.

8. An abrasive resistant main plate as defined in claim 7 characterised in that the grooves or notches in the white cast iron plate have bevelled edges. 7

9. An abrasive resistant main plate as defined In claim 6 characterised in that the cuts terminate adjacent the edges of the main plate.

10. An abrasive resistant main plate as defined in claim 6 characterised in that where the cuts intersect, the cuts terminate adjacent the intersection. 5

11. An abrasive resistant main plate comprising a plate of cast white iron metallurgically bonded to a mild steel carrier plate, the white cast iron plate having a plurality of bevel edged grooves across the surface of the white cast iron plate to divide the surface into individual plates sections, the mild steel carrier plate having corresponding cuts or notches opposite the grooves on the cast 10 white iron plate whereby the abrasive resistant main plate may be fractured along one or more of the grooves and cuts or notches to produce smaller individual abrasive resistant plates.

12. An abrasive resistant main plate as defined in claim 11 wherein the cuts in the mild steel carrier plate extend through the thickness of the mild steel 15 carrier plate and terminate adjacent the edges of the abrasive resistant main plate and also terminate adjacent the intersection of further cuts in the mild steel carrier plate.

13. A method of providing abrasive resistant plates of a shape for repair of an apparatus requiring repair of an abrasive resistant surface including the 20 steps of providing a main abrasive resistant plate of a cast white iron plate metallurgically bonded to mild steel plate, the cast white iron plate having a plurality of bevelled grooves extending across its surface, the mild steel plate having a corresponding plurality of notches underlying the bevelled grooves, the method including the step of fracturing the main abrasive resistant plate into 25 the desired shape abrasive resistant plate portion to repair the apparatus and then affixing the shaped abrasive resistant plate portion to the apparatus by welding or studs welded to the portion of the mild steel plate.