EP0011365A1 - Pflugstreichbleche und Verfahren zu deren Herstellung - Google Patents

Pflugstreichbleche und Verfahren zu deren Herstellung Download PDF

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Publication number
EP0011365A1
EP0011365A1 EP79302060A EP79302060A EP0011365A1 EP 0011365 A1 EP0011365 A1 EP 0011365A1 EP 79302060 A EP79302060 A EP 79302060A EP 79302060 A EP79302060 A EP 79302060A EP 0011365 A1 EP0011365 A1 EP 0011365A1
Authority
EP
European Patent Office
Prior art keywords
mouldboard
steel
blank
rare earth
sulphur
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP79302060A
Other languages
English (en)
French (fr)
Inventor
George William Miles
Barry James Cowan
Barry Harding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wa Tyzack & Co Ltd
Tyzack W A and Co Ltd
Original Assignee
Wa Tyzack & Co Ltd
Tyzack W A and Co Ltd
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 Wa Tyzack & Co Ltd, Tyzack W A and Co Ltd filed Critical Wa Tyzack & Co Ltd
Publication of EP0011365A1 publication Critical patent/EP0011365A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60

Definitions

  • This invention relates to mouldboards for tractor plough bodies.
  • mouldboards have been manufactured from three-ply iron and steel, i.e. two sheets of steel with an iron sheet sandwiched between.
  • the mouldboard is part of a plough body, and works by lifting the furrow slice, the mouldboard contour turning the slice sideways and laying it against a similarly turned slice of a previously made furrow.
  • the mouldboard has the abrasion of the soil against it, both back and front, although more so with the front. This action of the mouldboard passing through the soil causes it to wear. In addition to this it can encounter a variety of objects creating a danger of breakage or fracture.
  • mouldboards be made from a material that will resist wear and breakage.
  • the object of this invention is to provide an all- steel mouldboard which is not liable to such breakage as would render the mouldboard useless, and which has reasonable wear resistance, so that a set of assembled mouldboards on a plough will give a consistent performance and avoid the problem of replacing individual mouldboards whilst the plough is in operation.
  • a mouldboard is formed from a steel containing sulphur or sulphides into which there has been incorporated sufficient rare earth elements or other sulphide shape modifying elements to form sulphides of substantially globular form.
  • a method for the manufacture of a mouldboard comprises gradually and uniformly heating a blank of steel incorporating sulphide shape modifying elements in a furnace to a temperature whereat it can be formed, forming said blank into the desired shape, and quenching the formed article.
  • the directionality of any steel structure is primarily influenced by non-metallic inclusions such as sulphides and silicates. If the form of these can be controlled so that the formation of stringers can be prevented and instead the sulphur content presented in spheroidal or globular form, and randomly distributed, then the directionality of the steel will be minimised or even eliminated.
  • This desired standard is achieved in the steel used in the present invention by adding rare earth elements, such as cerium and lanthanum, or other sulphide shape modifying elements as calcium, titanium or zilconium in amounts appropriate to the sulphur content of the steel, and related to the rest of the steelmaking practice.
  • rare earths One convenient form of rare earths is the compound called Mischmetal, containing approximately 50% cerium, 25% lanthanum, the remainder being other rare earth elements.
  • Mischmetal containing approximately 50% cerium, 25% lanthanum, the remainder being other rare earth elements.
  • Another suitable way of introducing cerium into the steel composition is in the form of ferro-cerium.
  • rare earth additions should preferably be used on steel of very low sulphur content, less than 0.05%, suitably less than 0.02%. By using a double slag process to ensure both low sulphur content and clean steel, the rare earth additions are kept to low amounts yet still ensuring the complete modification of the form of the non-metallic inclusions.
  • the steel should be thoroughly deoxidised, using aluminium or other grain refining elements, in such amounts that complete grain refining is achieved.
  • This method of preventing marked directionality in the rolled strip, sheet or plate, by modifying the form of the sulphides, is quite distinct from the post-steelmaking procedures that are already utilised to try to obviate such directionality, namely the use of cross-rolling in varying degrees, whether from slab to form sheet or the transverse rolling of thick strip, or the use of the austempering process of heat treatment which is claimed to minimise or eliminate directionality.
  • the grade of slab When rolled to sheet, the grade of slab can be chosen so that apart from the desired absence of deleterious defects of any kind, including segregation and pipe, the surface finish is of a high standard that will allow further processing to yield mouldboards free from unacceptable flaws.
  • the surface of the strip is preferably free from unacceptable surface flaws.
  • the surface of the strip is preferably free from unacceptable surface flaws. To this end, it may sometimes be necessary to specify a pickled surface.
  • a high carbon steel composition for use according to the invention may contain, by weight, 0.6% to 1.2% carbon, up to 0.35% silicon, up to 0.02% sulphur, up to 0.05% phosphorus, 0.5 to 1.5% manganese, up to 1.0% chromium, and up to 0.10% rare earth metal, or equivalent amount of other sulphide shape control elements the remainder being predominantly jrnn and unavoidable residual elements, the sulphur being present in the form of sulphide of substantially globular form.
  • a p'articularly useful high carbon steel specification for makino aoricultural mouldboards in accordance with the invention is:-
  • strip sheet or plate is manufactured from a suitable steel as previously described and is cold blanked or pared to its flat shape, and any mounting holes are punched or drilled and reamed as necessary.
  • the blanks are then loaded into a furnace, for example the "walking beam” furnace shown schematically in Figures 1 and 2 of the accompanying drawings.
  • the furnace of Figures 1 and 2 is designed to accomplish uniform heating of the blanks and regulate a consistent delivery to the press form/quenching units.
  • the arrow indicates the progression of the blanks through the furnace which is commonly called a"walking beam" furnace.
  • a burner (a) e.g. a gas or oil burner, is mounted at the loading end, and is designed to produce the maximum temperature of the work at the discharge end (b).
  • the temperature of the blank at discharge is governed by:-
  • the slot (c) in the hearth ( Figure 2 - which is an end view of the furnace) allows through-heating of the blank, the result being a consistently heated blank at the discharge point (b) of the furnace.
  • Another advantage of the furnace is the saving in heat and time in bringing the furnace up to a working temperature.
  • the top of the furnace (d) is built on a modular construction and any worn or burnt out section can be quickly replaced.
  • a ceramic fibre lining for roof and walls is used to reduce heat losses.
  • the blanks are suitably picked up by vacuum pads and are deposited at the entry (e) to the furnace and thence on to the "walking beam" (f).
  • This loading device is interlocked with the furnace circuitry, and carefully timed to the furnace temperature and bending press operation or press-form quenching unit.
  • the beam (f) is actuated by an air cylinder, and the beam assembly (g) traverses along tracks mounted at the base of the furnace through rollers (h).
  • the heated mouldboard blanks are removed from the furnace exit (b) at an appropriate hardening temperature and fed into the press form/quench tools shown in side and plan view respectively in Figures 3 and 4 of the accompanying drawings.
  • These tools are designed to hot form the blanks into the required mouldboard shape and comprise a stationary tool (a) and a moving mating tool (b). Both are formed with a plurality of holes (c) through which quenching fluid may flow.
  • the flat mouldboard blank is set into the stationary tool (a) to a stop position, and the moving tool (b) is actuated downwardly, thus forming the ultimate shape of the mouldboard.
  • the timing of the quench is governed to harden the blank and the oil feed can be varied to either face for sudden or delayed quenching.
  • press form/quenching The purpose of this action of press form/quenching is to make the shape and hold to the required contour during the quenching process, avoiding the change of shape that otherwise prevails in free quenching.
  • the component When the required hardening has been achieved the component is then ready for tempering and final surface operations can be undertaken.
  • the formed mouldboard may be quenched to a hardness in excess of 810 Hv30, lightly tempering back to an acceptable working hardness, for example, 750-800 Hv30.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
EP79302060A 1978-10-02 1979-10-01 Pflugstreichbleche und Verfahren zu deren Herstellung Withdrawn EP0011365A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB7838955 1978-10-02
GB3895578 1978-10-02
GB7911745 1979-04-04
GB7911745 1979-04-04

Publications (1)

Publication Number Publication Date
EP0011365A1 true EP0011365A1 (de) 1980-05-28

Family

ID=26269035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302060A Withdrawn EP0011365A1 (de) 1978-10-02 1979-10-01 Pflugstreichbleche und Verfahren zu deren Herstellung

Country Status (1)

Country Link
EP (1) EP0011365A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0838534A1 (de) * 1996-10-25 1998-04-29 Lucchini Centro Ricerche E Sviluppo S.r.l. Ausgeschwefelter Stahl mit feiner austenitischer Körnung und Verfahren zu seiner Herstellung
WO2009002409A1 (en) * 2007-06-22 2008-12-31 Caterpillar Inc. Multiple surface mouldboard fabricated from a one-piece blank for a bulldozer
CN113564470A (zh) * 2021-07-16 2021-10-29 鞍钢股份有限公司 1700MPa耐热农机用钢及其制造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2003306A1 (de) * 1969-01-25 1970-07-30 Aisin Seiki Verfahren und Einrichtung zum Pressen und Haerten eines Stahlteiles
US3806379A (en) * 1972-03-13 1974-04-23 Crucible Inc Method for heat treating coulter blades
DE2603618A1 (de) * 1975-06-05 1976-12-23 Kenebuc Galt Ltd Verfahren und vorrichtung zur waermebehandlung von stahl
DE2706597A1 (de) * 1976-02-17 1977-08-18 Honda Motor Co Ltd Bremsscheibe und herstellungsverfahren hierfuer
US4098622A (en) * 1976-05-14 1978-07-04 International Harvester Company Earth-working implement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2003306A1 (de) * 1969-01-25 1970-07-30 Aisin Seiki Verfahren und Einrichtung zum Pressen und Haerten eines Stahlteiles
US3806379A (en) * 1972-03-13 1974-04-23 Crucible Inc Method for heat treating coulter blades
DE2603618A1 (de) * 1975-06-05 1976-12-23 Kenebuc Galt Ltd Verfahren und vorrichtung zur waermebehandlung von stahl
DE2706597A1 (de) * 1976-02-17 1977-08-18 Honda Motor Co Ltd Bremsscheibe und herstellungsverfahren hierfuer
US4098622A (en) * 1976-05-14 1978-07-04 International Harvester Company Earth-working implement
US4098622B1 (en) * 1976-05-14 1995-11-28 Case Corp Earth- working implement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0838534A1 (de) * 1996-10-25 1998-04-29 Lucchini Centro Ricerche E Sviluppo S.r.l. Ausgeschwefelter Stahl mit feiner austenitischer Körnung und Verfahren zu seiner Herstellung
WO2009002409A1 (en) * 2007-06-22 2008-12-31 Caterpillar Inc. Multiple surface mouldboard fabricated from a one-piece blank for a bulldozer
CN113564470A (zh) * 2021-07-16 2021-10-29 鞍钢股份有限公司 1700MPa耐热农机用钢及其制造方法

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Designated state(s): BE DE FR IT LU NL

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Effective date: 19801031

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Effective date: 19820705

RIN1 Information on inventor provided before grant (corrected)

Inventor name: MILES, GEORGE WILLIAM

Inventor name: HARDING, BARRY

Inventor name: COWAN, BARRY JAMES