WO1996006231A1 - Method for making a working edge of a working plate and a corresponding working edge of a working plate - Google Patents

Method for making a working edge of a working plate and a corresponding working edge of a working plate Download PDF

Info

Publication number
WO1996006231A1
WO1996006231A1 PCT/FI1995/000440 FI9500440W WO9606231A1 WO 1996006231 A1 WO1996006231 A1 WO 1996006231A1 FI 9500440 W FI9500440 W FI 9500440W WO 9606231 A1 WO9606231 A1 WO 9606231A1
Authority
WO
WIPO (PCT)
Prior art keywords
working
fixing grooves
edge
border
working plate
Prior art date
Application number
PCT/FI1995/000440
Other languages
French (fr)
Inventor
Veli-Pekka Mamia
Original Assignee
Mamia Veli Pekka
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 Mamia Veli Pekka filed Critical Mamia Veli Pekka
Priority to AU32253/95A priority Critical patent/AU3225395A/en
Publication of WO1996006231A1 publication Critical patent/WO1996006231A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/815—Blades; Levelling or scarifying tools
    • E02F3/8152—Attachments therefor, e.g. wear resisting parts, cutting edges

Definitions

  • the present invention relates to a method for fabricating the working edge of a working plate and to a working edge of a working plate.
  • ploughing equipment In earthwork such as road construction and maintenance, snowploughing and similar applications, many types of ploughing equipment are used, which have in common a substantially straight and even-edged wor ⁇ king plate that is drawn or pushed along a working fa ⁇ ce.
  • the working plate usually consists of a steel pla ⁇ te, which in many applications is detachably mounted on the earth board of a plough because the working plate must be so mounted that it can be relatively ea ⁇ sily replaced as it is subject to rapid wear.
  • the working plate In normal working conditions, the working plate is worn down in a few weeks or months to a state that necessitates replacement of the plate, and in ve- ry abrasive conditions, e.g. when ploughing away the slush gathered on asphalt in spring time, the working plate may wear down so fast that it has to be replaced after a single work day.
  • the object of the invention is to eliminate the drawbacks referred to.
  • a special object of the in ⁇ vention is to produce a new type of a method and a working edge of a working plate that allow a maximum service life of the working plate to be achieved.
  • the invention is not based on a separate hard metal piece or separa- te hard metal pieces attached to the working edge of the working plate but instead it is based on forming a wear-resisting part of a suitable metal on the working edge of the working plate, said part being thus made an essential and fixed part of the working plate wit- hout separate fixtures.
  • one or more fixing grooves are machined in the working plate near the working edge to a depth preferably cor ⁇ responding to at least half the thickness of the wor- king plate.
  • the fixing grooves are then filled with chromium carbide steel by welding, whereupon a border or ridge of high-alloy steel more elastic than chro ⁇ mium carbide steel is formed by welding on the surface of the working plate around the filled grooves, star- ting from the verge of the working edge and extending across the whole width of the working plate, running along the working edge and upwards along the end faces of the working plate and conjoining on the other side of the filled fixing grooves to form a continuous bor- der of e.g. rectangular shape.
  • the area enclosed by the border is sub ⁇ stantially filled with chromium carbide steel by wel ⁇ ding up to a thickness determined by the height of the border, thus forming on the working edge of the wor- king plate a hard and wear-resisting metal layer that is an essential and fixed part of the original working plate. Therefore, the gradual wear of this hard metal layer during use of the working plate will not weaken its attachment to the plate, but the hard metal layer will sit securely in place to the last bit of the ed ⁇ ge.
  • the working edge of a working plate according to the invention comprises fixing grooves on the sur ⁇ face of the working plate, anchorages of chromium car ⁇ bide steel welded in the fixing grooves, a border of preferably rectangular shape formed by welding on the surface of the working plate, surrounding the fixing grooves, and a weld of chromium carbide steel filling the area enclosed by the border.
  • the fixing grooves are preferably laid in a direction parallel to the working edge and at a dis ⁇ tance from it and from each other.
  • the working plate has two parallel fixing grooves.
  • the invention is preferably implemented using chromium carbide steel containing about 5 % carbon, about 3 % manganese, about 2 % silicon and about 27 % chromium, the rest consisting of iron.
  • Another chro ⁇ mium carbide steel alloy applicable in the invention contains 4 % carbon, 2 % manganese and 25 % chromium, the rest consisting of iron.
  • These alloys are commer ⁇ cially available chromium carbide steel alloys, but other kinds of chromium carbide steel alloys may also be used in different embodiments of the invention.
  • the border fabricated on the working edge by welding is preferably made from a high-alloy steel mo ⁇ re elastic than chromium carbide steel to form a fle ⁇ xible and elastic framework that keeps the chromium carbide steel weld well together during fabrication.
  • high-alloy steels that can be used according to the invention for the welding of the border are e.g. alloys containing 0.08 % carbon, 20.5 % chromium, 9.5 % nickel, 4.5 % manganese, 0.8 % molybdenum, the rest consisting of iron, or 0.01 % carbon, 18 % chromium, 8.5 % nickel, 4.25 % molybdenum, the rest consisting of iron.
  • high-alloy steel having corresponding properties.
  • high-alloy steels which have a relatively low hardness after welding, e.g.
  • the border is relatively flexible and elastic during manufacture and only reaches its final hardness in the finished structure e.g. during use of the working plate.
  • the method and working edge of a working pla- te of the invention have significant advantages over previously known technology.
  • the working plate can be fabricated relatively quickly. Yet, according to tests performed at the Polytechnical Institute, it reaches a durability 15-20 times longer than that of a conven- tional non-reinforced working plate made of steel. Thus, considering the length of its service life, the working plate of the invention is clearly more advan ⁇ tageous than conventional working plates in respect of both investment and working costs.
  • the invention is described in detail by referring to the attached drawing, in which
  • Fig. 1 presents a sectional view and a lateral view of the first stage of the method of the invention
  • Fig. 2 presents a sectional view and a lateral view of the second stage of the method of the invention
  • Fig. 3 presents a sectional view and a lateral view of the third stage of the method of the invention
  • Fig. 4 presents a sectional view and a lateral view of a finished product fabricated by the method of the in ⁇ vention.
  • two fixing grooves 3 laid parallel to the working edge 2 at a distance from it and from each other are machined in the surfa- ce of the working plate in its lower part near the working edge 2, the depth of the grooves equalling at least half the thickness of the plate.
  • the grooves ex- tend across the whole width of the working plate, i.e. from one vertical edge to the other.
  • the grooves are filled with a suitable chromium carbide steel alloy 4 by welding, as illus- trated by Fig. 2.
  • a bor ⁇ der 5 is formed around the filled grooves 3 by wel ⁇ ding.
  • the border extends on the surface of the working plate along the two vertical edges of the working pla- te, along its working edge 2 and, parallel to the wor ⁇ king edge, on the other side of the filled grooves 3 so that the border surrounds the grooves filled with chromium carbide steel. In this way, a rectangular border is formed in the lower part of one of the wor- king plate surfaces.
  • the height of the border can be smoot ⁇ hed out and the border can be machined to a suitable height throughout its circumference.
  • the area 6 enclosed by the border 5 is then filled with chromium carbide steel 7 by welding to a level determined by the height of the border.
  • the lower part of one of the working plate surfaces is provided with a very hard and wear-resisting metal layer that forms an essentially fixed part of the wor- king plate and remains securely joined to it as tne edge part of the working plate and the hard metal part are worn at an equal rate determined by the hard metal part when the working plate is used.
  • the working plate is preferably implemented in a reversible form by making a reinforcement accor ⁇ ding to the invention on both working edges of the working plate, so that, after one of the edges has been worn out, the working plate can be reversed so that the worn-out edge is turned up and the new wor- king edge is turned down into the working position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention relates to a method for fabricating the working edge of a working plate and to a working edge of a working plate. The working edge comprises fixing grooves (3) in the surface of the working plate (1), chromium carbide steel anchorages (4) welded in the fixing grooves, a border (5) around the fixing grooves on the surface of the working plate and a chromium carbide weld (7) filling the area (6) enclosed by the border.

Description

METHOD FOR MAKING A WORKING EDGE OF A WORKING PLATE AND A CORRESPONDING WORKING EDGE OF A WORKING PLATE
The present invention relates to a method for fabricating the working edge of a working plate and to a working edge of a working plate.
In earthwork such as road construction and maintenance, snowploughing and similar applications, many types of ploughing equipment are used, which have in common a substantially straight and even-edged wor¬ king plate that is drawn or pushed along a working fa¬ ce. The working plate usually consists of a steel pla¬ te, which in many applications is detachably mounted on the earth board of a plough because the working plate must be so mounted that it can be relatively ea¬ sily replaced as it is subject to rapid wear.
In normal working conditions, the working plate is worn down in a few weeks or months to a state that necessitates replacement of the plate, and in ve- ry abrasive conditions, e.g. when ploughing away the slush gathered on asphalt in spring time, the working plate may wear down so fast that it has to be replaced after a single work day.
The object of the invention is to eliminate the drawbacks referred to. A special object of the in¬ vention is to produce a new type of a method and a working edge of a working plate that allow a maximum service life of the working plate to be achieved.
As for the features characteristic of the in- vention, reference is made to the claims.
As the working plate is used in conditions involving intense wear and hard impacts and torsion, it is not possible to attach to its working edge a se¬ parate, more durable piece of hard metal because the welded or bolted joints would not withstand the stre¬ nuous working conditions and because these joints would wear down with the working edge and the hard me¬ tal piece would come off.
In view of these circumstances, the invention is not based on a separate hard metal piece or separa- te hard metal pieces attached to the working edge of the working plate but instead it is based on forming a wear-resisting part of a suitable metal on the working edge of the working plate, said part being thus made an essential and fixed part of the working plate wit- hout separate fixtures.
Consequently, in the method of the invention, one or more fixing grooves are machined in the working plate near the working edge to a depth preferably cor¬ responding to at least half the thickness of the wor- king plate. The fixing grooves are then filled with chromium carbide steel by welding, whereupon a border or ridge of high-alloy steel more elastic than chro¬ mium carbide steel is formed by welding on the surface of the working plate around the filled grooves, star- ting from the verge of the working edge and extending across the whole width of the working plate, running along the working edge and upwards along the end faces of the working plate and conjoining on the other side of the filled fixing grooves to form a continuous bor- der of e.g. rectangular shape.
Next, the area enclosed by the border is sub¬ stantially filled with chromium carbide steel by wel¬ ding up to a thickness determined by the height of the border, thus forming on the working edge of the wor- king plate a hard and wear-resisting metal layer that is an essential and fixed part of the original working plate. Therefore, the gradual wear of this hard metal layer during use of the working plate will not weaken its attachment to the plate, but the hard metal layer will sit securely in place to the last bit of the ed¬ ge. The working edge of a working plate according to the invention comprises fixing grooves on the sur¬ face of the working plate, anchorages of chromium car¬ bide steel welded in the fixing grooves, a border of preferably rectangular shape formed by welding on the surface of the working plate, surrounding the fixing grooves, and a weld of chromium carbide steel filling the area enclosed by the border.
The fixing grooves are preferably laid in a direction parallel to the working edge and at a dis¬ tance from it and from each other. In a preferred em¬ bodiment, the working plate has two parallel fixing grooves.
The invention is preferably implemented using chromium carbide steel containing about 5 % carbon, about 3 % manganese, about 2 % silicon and about 27 % chromium, the rest consisting of iron. Another chro¬ mium carbide steel alloy applicable in the invention contains 4 % carbon, 2 % manganese and 25 % chromium, the rest consisting of iron. These alloys are commer¬ cially available chromium carbide steel alloys, but other kinds of chromium carbide steel alloys may also be used in different embodiments of the invention.
The border fabricated on the working edge by welding is preferably made from a high-alloy steel mo¬ re elastic than chromium carbide steel to form a fle¬ xible and elastic framework that keeps the chromium carbide steel weld well together during fabrication.
Among the commercially available high-alloy steels that can be used according to the invention for the welding of the border are e.g. alloys containing 0.08 % carbon, 20.5 % chromium, 9.5 % nickel, 4.5 % manganese, 0.8 % molybdenum, the rest consisting of iron, or 0.01 % carbon, 18 % chromium, 8.5 % nickel, 4.25 % molybdenum, the rest consisting of iron. Of course, it is also possible to use other kinds of high-alloy steel having corresponding properties. Especially usable for the welding of the bor¬ der are high-alloy steels which have a relatively low hardness after welding, e.g. about 200 brinell, and which only reach their final degree of hardness, e.g. 400 - 450 brinell, after treatment. Thus, the border is relatively flexible and elastic during manufacture and only reaches its final hardness in the finished structure e.g. during use of the working plate.
The method and working edge of a working pla- te of the invention have significant advantages over previously known technology. The working plate can be fabricated relatively quickly. Yet, according to tests performed at the Polytechnical Institute, it reaches a durability 15-20 times longer than that of a conven- tional non-reinforced working plate made of steel. Thus, considering the length of its service life, the working plate of the invention is clearly more advan¬ tageous than conventional working plates in respect of both investment and working costs. In the following, the invention is described in detail by referring to the attached drawing, in which
Fig. 1 presents a sectional view and a lateral view of the first stage of the method of the invention, Fig. 2 presents a sectional view and a lateral view of the second stage of the method of the invention, Fig. 3 presents a sectional view and a lateral view of the third stage of the method of the invention, Fig. 4 presents a sectional view and a lateral view of a finished product fabricated by the method of the in¬ vention.
As illustrated by Fig. 1, two fixing grooves 3 laid parallel to the working edge 2 at a distance from it and from each other are machined in the surfa- ce of the working plate in its lower part near the working edge 2, the depth of the grooves equalling at least half the thickness of the plate. The grooves ex- tend across the whole width of the working plate, i.e. from one vertical edge to the other.
Next, the grooves are filled with a suitable chromium carbide steel alloy 4 by welding, as illus- trated by Fig. 2.
After this, as illustrated by Fig. 3, a bor¬ der 5 is formed around the filled grooves 3 by wel¬ ding. The border extends on the surface of the working plate along the two vertical edges of the working pla- te, along its working edge 2 and, parallel to the wor¬ king edge, on the other side of the filled grooves 3 so that the border surrounds the grooves filled with chromium carbide steel. In this way, a rectangular border is formed in the lower part of one of the wor- king plate surfaces.
Next, the height of the border can be smoot¬ hed out and the border can be machined to a suitable height throughout its circumference. As illustrated by Fig. 4, the area 6 enclosed by the border 5 is then filled with chromium carbide steel 7 by welding to a level determined by the height of the border. Thus, the lower part of one of the working plate surfaces is provided with a very hard and wear-resisting metal layer that forms an essentially fixed part of the wor- king plate and remains securely joined to it as tne edge part of the working plate and the hard metal part are worn at an equal rate determined by the hard metal part when the working plate is used.
The working plate is preferably implemented in a reversible form by making a reinforcement accor¬ ding to the invention on both working edges of the working plate, so that, after one of the edges has been worn out, the working plate can be reversed so that the worn-out edge is turned up and the new wor- king edge is turned down into the working position.
In the above, the invention is described by way of example by the aid of a drawing, but different embodiments of the invention are possible within the scope of the inventive idea defined by the claims.

Claims

1. Method for fabricating the working edge of a working plate, in which
- fixing grooves (3) are machined near the working ed- ge (2) , and
- the fixing grooves are substantially filled with chromium carbide steel (4) by welding, characterized in that
- a border (5) of a more elastic high-alloy steel is formed around the fixing grooves on the surface of the working plate by welding, and
- the area (6) enclosed by the border is filled with chromium carbide steel (7) by welding.
2. Method according to claim 1, characterized in that the fixing grooves (3) are so machined that they lie in a direction parallel to the working edge (2) and at a distance from it and from each other.
3. Working edge of a working plate, compri¬ sing - fixing grooves (3) in the surface of the working plate (1) , and
- chromium carbide steel anchorages (4) welded in the fixing grooves, characterized in that the working edge comprises - a border (5) on the surface of the working plate, surrounding the fixing grooves, and
- a chromium carbide weld (7) filling the area (6) en¬ closed by the border.
4. Working edge according to claim 4, charac- terized in that the fixing grooves (3) lie parallel to the working edge (2) and at a distance from it and from each other.
5. Working edge according to claim 3 or 4, characterized in that it comprises two fixing grooves (3).
6. Working edge according to any one of claims 3 - 5, characterized in that the chromium car- bide steel anchorages fill the fixing grooves (3) sub¬ stantially completely.
7. Working edge according to any one of claims 3 - 6, characterized in that the border (5) is welded from a high-alloy steel more elastic than chro¬ mium carbide steel.
8. Working edge according to any one of claims 3 - 7, characterized in that the lower edge of the border (5) lies flush with the lower edge, i.e. the working edge (2) of the working plate.
9. Working edge according to any one of claims 3 - 8, characterized in that the height of the border (5) determines the thickness of the working ed¬ ge.
PCT/FI1995/000440 1994-08-23 1995-08-21 Method for making a working edge of a working plate and a corresponding working edge of a working plate WO1996006231A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU32253/95A AU3225395A (en) 1994-08-23 1995-08-21 Method for making a working edge of a working plate and a corresponding working edge of a working plate

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI943878A FI95493C (en) 1994-08-23 1994-08-23 Process for producing a machining edge of a machining plate and the corresponding machining edge of a machining plate
FI943878 1994-08-23

Publications (1)

Publication Number Publication Date
WO1996006231A1 true WO1996006231A1 (en) 1996-02-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000440 WO1996006231A1 (en) 1994-08-23 1995-08-21 Method for making a working edge of a working plate and a corresponding working edge of a working plate

Country Status (3)

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AU (1) AU3225395A (en)
FI (1) FI95493C (en)
WO (1) WO1996006231A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2887797A (en) * 1957-01-22 1959-05-26 O'connor George Kevin Scraper blade for road graders
US4052802A (en) * 1976-02-23 1977-10-11 Caterpillar Tractor Co. Ground-engaging tool with wear-resistant insert
SE397645B (en) * 1974-11-07 1977-11-14 Bofors Ab WAY TO LIFE THE LIFE OF METALLIC WEAR DETAILS
DE4221085A1 (en) * 1992-06-26 1994-01-05 Lausitzer Braunkohle Ag Cutting component for loosening rock - is component of cutter of digger of extraction appts and involves wear protection units in recesses on basic body of cutting component.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2887797A (en) * 1957-01-22 1959-05-26 O'connor George Kevin Scraper blade for road graders
SE397645B (en) * 1974-11-07 1977-11-14 Bofors Ab WAY TO LIFE THE LIFE OF METALLIC WEAR DETAILS
US4052802A (en) * 1976-02-23 1977-10-11 Caterpillar Tractor Co. Ground-engaging tool with wear-resistant insert
DE4221085A1 (en) * 1992-06-26 1994-01-05 Lausitzer Braunkohle Ag Cutting component for loosening rock - is component of cutter of digger of extraction appts and involves wear protection units in recesses on basic body of cutting component.

Also Published As

Publication number Publication date
FI95493B (en) 1995-10-31
FI943878A0 (en) 1994-08-23
AU3225395A (en) 1996-03-14
FI95493C (en) 1996-02-12

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