WO1997014291A1

WO1997014291A1 - Wear resisting device

Info

Publication number: WO1997014291A1
Application number: PCT/AU1996/000648
Authority: WO
Inventors: Ronald George Yates
Original assignee: Nortech Corporation Pty. Ltd.
Priority date: 1995-10-16
Filing date: 1996-10-16
Publication date: 1997-04-24
Also published as: AUPN597995A0

Abstract

A wear resisting device (10) including: a core plate (12) having integral protrusions (14) on one side and corresponding indentations (16) on the other side, both sides of the core plate (12) being covered with an abrasion and/or impact resistant material (22) such as plastics or rubber. Holes (18) are formed through the protrusions and indentations. Holes (20) are also formed through other locations of core plate (12). The material (22) can cover either part or the total height of the protrusions. The material (22) flows through holes (18 and 20) and this 'keying' of the material (22) to the core plate (12) assists in preventing separation of material (22) from core plate (12). The wear resisting device (10) can be applied to mining and agricultural equipment especially to surfaces of relatively large curvature such as wear prone points and edges of shares, scarifiers, tillage points, combines and plough discs, and other devices having points, edges or other regions of sharp or relatively sharp curvature.

Description

WEARRESISTINGDEVICE

TECHNICAL FIELD

This invention relates to a improvements in wear resisting devices and improvements in the method of producing wear resisting devices.

This invention has particular but not exclusive application to mining and agricultural equipment which is subjected to high levels of abrasion and/or impact.

BACKGROUND ART

It is known to weld studs to a wearing surface to improve the wear characteristics of that surface and improve the effective life of the equipment. It is believed that soil fills the gaps between the studs and thereafter acts as a protective buffer for the wearing surface. It is also believed that the soil assists in supporting the studs against dislodgement.

An improvement is to at least partially cover the studs with a layer of abrasion and/or impact resistant material such as urethane. This improvement is the subject of the present applicant's Australian Patent 652484, the contents of which are hereby incorporated into the present specification by cross-reference.

The present invention is a further improvement over the above systems.

DISCLOSURE OF INVENTION

This invention in one aspect resides in a wear resisting device including:- a core plate having integral protrusions or indentations, the integral protrusions or indentations being at least partially covered by an abrasion and/or impact resistant material.

Preferably, the core plate has protrusions on one side and corresponding indentations on the other side, both sides of the core plate being at least partially covered with an abrasion and/or impact resistant material. Most preferably, the core plate is pressed to simultaneously form the protrusions and indentations although it may be formed by other means, eg. casting.

Preferably, the abrasion and/or impact resistant material extends through holes in the core plate. Most preferably, the holes extend through the protrusions or indentations.

In another aspect the invention resides in a method of manufacturing a wear resistant device, the method including:- integrally forming protrusions or indentations on a core plate, at least partially covering the protrusions or indentations with an abrasive and/or impact resistant material.

Preferably, the integral protrusions are formed on one side of the core plate and corresponding indentations are formed on the other side of the core plate and both sides of the core plate are at least partially covered with an abrasion and/or impact resistant material.

Preferably, the protrusions and indentations are simultaneously formed by pressing.

Preferably, the method further includes forming holes in the core plate such that the abrasion and/or impact resistant material fills the holes. Preferably, the holes are formed through the protrusions and indentations.

BRIEF DESCRIPTION OF DRAWINGS

In order that this invention may be more easily understood and put into practical effect, reference will now be made to the accompanying drawings which illustrate a preferred embodiment of the invention, wherein:-

FIG 1 is a plan view of an agricultural point according to the invention; and

FIG 2 is a sectioned view along line 2-2 of FIG 1.

BEST MODE

In the illustrated embodiment the device is an agricultural point. However, the device may be any device in which wear resistance is desirable, particularly in the areas of mining and agriculture. Point 10 includes core plate 12 which may be steel, eg. S1070 steel with 0.7% carbon, or nickel/chrome steels. The core plate may be of any suitable thickness, eg. 2mm to 40mm. In the illustrated embodiment, the core plate is 4mm thick and the protrusions are raised 2mm by pressing.

Protrusions 14 of any desired shape and in any desired pattern can be pressed, cast or forged in the core plate. This creates a corresponding array of indentations 16 in the other side of core plate 12. Holes 18 are formed through the protrusions and indentations. Holes 20 are also formed through other locations of core plate 12. In the illustrated embodiment the holes are 2mm in diameter.

An abrasion and/or impact resistant material 22 such as plastics (eg. urethane) or rubber is applied to core plate 12 after the core plate has been prepared with a bonding agent. The material 22 is preferably Urethane 90 or 93 DURO "Polyslip" impregnated with wear resistant "Teflon" or any other urethane manufactured with abrasion resistant additions.

The material 22 can cover either part or the total height of the protrusions. In the illustrated embodiment the material 22 covers the protrusions by l-2mm.

As will be apparent, material 22 flows through holes 18 and 20 and this "keying" of the material 22 to the core plate 12 assists in preventing seperation of material 22 from core plate 12.

The invention can be advantageously applied to surfaces of relatively large curvature such as wear prone points and edges of shares, scarifiers, tillage points, combines and plough discs, and other devices having points, edges or other regions of sharp or relatively sharp curvature.

It will of course be realised that whilst the above has been given by way of an illustrative example of this invention, all such and other modifications and variations hereto, as would be apparent to persons skilled in the art, are deemed to fall within the broad scope and ambit of this invention as is herein set forth.

Claims

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS:-

1. A wear resisting device including:- a core plate having integral protrusions or indentations, the integral protrusions or indentations being at least partially covered by an abrasion and/or impact resistant material.

2. A wear resisting device as claimed in claim 1, wherein the core plate has protrusions on one side and corresponding indentations on the other side, both sides of the core plate being at least partially covered with an abrasion and/or impact resistant material.

3. A device as claimed in claim 2, wherein the core plate is pressed to simultaneously form the protrusions and indentations.

4. A device as claimed in claim 1, wherein the abrasion and/or impact resistant material extends through holes in the core plate.

5. A device as claimed in claim 2, wherein the abrasion and/or impact resistant material extends through holes in the core plate.

6. A device as claimed in claim 5, wherein the holes extend through the protrusions or indentations.

7. A method of manufacturing a wear resistant device, the method including:- integrally forming protrusions or indentations on a core plate; at least partially covering the protrusions or indentations with an abrasive and/or impact resistant material.

8. A method as claimed in claim 7, wherein the integral protrusions are formed on one side of the core plate and corresponding indentations are formed on the other side of the core plate and both sides of the core plate are at least partially covered with an abrasion and/or impact resistant material.

9. A method as claimed in claim 8, wherein the method further includes forming holes in the core plate such that the abrasion and/or impact resistant material fills the holes.

10. A method as claimed in claim 9, wherein the holes are formed through the protrusions and indentations.