EP0030933A1 - Procédé de production de pièces en fonte trempée et leur utilisation pour dents ou/et godets de dragues à godets - Google Patents

Procédé de production de pièces en fonte trempée et leur utilisation pour dents ou/et godets de dragues à godets Download PDF

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Publication number
EP0030933A1
EP0030933A1 EP80890143A EP80890143A EP0030933A1 EP 0030933 A1 EP0030933 A1 EP 0030933A1 EP 80890143 A EP80890143 A EP 80890143A EP 80890143 A EP80890143 A EP 80890143A EP 0030933 A1 EP0030933 A1 EP 0030933A1
Authority
EP
European Patent Office
Prior art keywords
castings
ferroboron
lips
teeth
areas
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.)
Granted
Application number
EP80890143A
Other languages
German (de)
English (en)
Other versions
EP0030933B1 (fr
Inventor
Ekkehart Dr. Krainer
Bernd Dipl.-Ing. Kos
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.)
Vereinigte Edelstahlwerke AG
Original Assignee
Vereinigte Edelstahlwerke AG
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 Vereinigte Edelstahlwerke AG filed Critical Vereinigte Edelstahlwerke AG
Publication of EP0030933A1 publication Critical patent/EP0030933A1/fr
Application granted granted Critical
Publication of EP0030933B1 publication Critical patent/EP0030933B1/fr
Expired legal-status Critical Current

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Classifications

    • 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 invention relates to a process for the production of metallic chilled castings with areas of increased wear resistance, which are created in the casting mold by introducing molded bodies that provide a local alloying effect with the melt material.
  • Another measure with the same objective is to embed hard material parts in the hollow volume of the casting mold, which are encased in the molded part by the matrix of the casting material and bring about a corresponding reduction in wear.
  • this solution cannot be considered completely satisfactory either, because additional precautions have to be taken, e.g. by using wire mesh or by another suggestion of suction pressure, in order to separate the individual hard material grains or to fix pieces in the hollow volume of the casting mold in such a way that the intended uniform distribution in the casting is generally ensured.
  • the object of the invention is therefore to avoid these disadvantages and to provide a method with which it is possible to produce wear-resistant castings with a combination of hardness and toughness which can be easily adapted to the respective requirements, and thus in the best possible way cost-effectively.
  • the method according to the invention is characterized in that a base metal melt made of high manganese steel and Porous moldings are used, which have been formed by foaming finely divided ferroboron, preferably in core boxes, mixed with an aqueous alkali silicate solution and optionally additional hard materials.
  • Fine-grain ferroboron (grain size 0.02 - 0.075 mm) was mixed with 30% sodium water glass and a very tough paste was formed. This porridge was then called Filling used about half of the hollow volume of core boxes, which were modeled on the tooth shape of excavator teeth.
  • the core boxes were then heated to-120 ° C. for 2 hours, during which time porous shaped bodies were formed whose pore size was 0.7 mm on average and whose pore volume was approximately 50%.
  • These moldings were inserted into a so-called "green" casting mold made of quartz sand for producing the excavator teeth and fastened there with shaped nails in such a way that - based on the surface of the tooth flank - about 50% of the tooth flank was laid out.
  • the casting was carried out with a melt of high manganese steel at a casting temperature of 1530 ° C.
  • the excavator teeth produced in this way showed excellent stability in practical use.
  • Example 2 Were blocked with 3% sodium sodium silicate 0 similarly as in a core box - from a slurry-like mixture of an intimate batch of 80 wt .-% of the ferroboron and described in Example 1 20 wt .-% aluminum oxide (0.1 mm grain size 0.05) in Example 1, moldings with a pore volume of about 50% in the dimension 100 x 100 x 15 mm. These shaped bodies were placed in the edge area of the lip of excavator buckets at a uniform distance of about 20 mm. In the mold and fastened there with shaped nails. The casting was carried out with a melt of high manganese steel heated to 1540 ° C.
  • Fig. 1 shows such a structure with the boride eutectic, using ferrobor molded articles with a pore volume of 20%, 90% of the ground surface having a hardness of 820-860 HV.
  • the pore volume of the shaped bodies was 40%; the area share with 800 - 860 HV is reduced to about 50%, while the basic mass (boron-containing Mn austenite) is 300 HV.
  • Fig. 3 shows a structure, the pore volume was 60%; the area share with 800 - 860 HV is 30%, the hardness of the base material is also 300 HV.
  • Fig. 4 shows the structure of the base metal matrix, that is, of manganese high-carbon steel at the same magnification ratio; its hardness is 240 HB.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP19800890143 1979-12-13 1980-12-03 Procédé de production de pièces en fonte trempée et leur utilisation pour dents ou/et godets de dragues à godets Expired EP0030933B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT7858/79 1979-12-13
AT785879A AT375035B (de) 1979-12-13 1979-12-13 Verfahren zur herstellung von metallischen hartguss-formteilen

Publications (2)

Publication Number Publication Date
EP0030933A1 true EP0030933A1 (fr) 1981-06-24
EP0030933B1 EP0030933B1 (fr) 1983-06-22

Family

ID=3600157

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800890143 Expired EP0030933B1 (fr) 1979-12-13 1980-12-03 Procédé de production de pièces en fonte trempée et leur utilisation pour dents ou/et godets de dragues à godets

Country Status (6)

Country Link
EP (1) EP0030933B1 (fr)
AT (1) AT375035B (fr)
CA (1) CA1159627A (fr)
DE (1) DE3063917D1 (fr)
GB (1) GB2065523B (fr)
WO (1) WO1981001673A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476496A1 (fr) * 1990-09-20 1992-03-25 Magotteaux International Procédé de fabrication d'une pièce de fonderie bimétallique et pièce d'usure réalisée par ce procédé
EP0759336A1 (fr) * 1994-05-13 1997-02-26 Komatsu Ltd. Procede de moulage de pieces resistant a l'usure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE719151C (de) * 1940-03-30 1942-03-30 Wilhelm Rominger Verfahren zur Herstellung hochbeanspruchter oder spezifisch leichter Gusskoerper
US3189958A (en) * 1961-05-12 1965-06-22 Trainer Associates Inc Method of bonding inserts into castings
DE1508887A1 (de) * 1966-08-27 1970-03-05 Kloth Senking Ag Mit stueckigen Einschlusskoerpern versehener Gussteil
DE2016312B2 (de) * 1970-04-06 1971-05-13 Verschleiß Technik Dr Ing Hans Wahl, 7304 Ruit Durchspuel verbundgiessverfahren
US4024902A (en) * 1975-05-16 1977-05-24 Baum Charles S Method of forming metal tungsten carbide composites
GB1478943A (en) * 1975-01-09 1977-07-06 Fiber Materials Metal/graphite fibre composite
DE2714906A1 (de) * 1977-04-02 1978-10-05 Wahl Verschleiss Tech Verklammerung fuer gusstuecke

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE719151C (de) * 1940-03-30 1942-03-30 Wilhelm Rominger Verfahren zur Herstellung hochbeanspruchter oder spezifisch leichter Gusskoerper
US3189958A (en) * 1961-05-12 1965-06-22 Trainer Associates Inc Method of bonding inserts into castings
DE1508887A1 (de) * 1966-08-27 1970-03-05 Kloth Senking Ag Mit stueckigen Einschlusskoerpern versehener Gussteil
DE2016312B2 (de) * 1970-04-06 1971-05-13 Verschleiß Technik Dr Ing Hans Wahl, 7304 Ruit Durchspuel verbundgiessverfahren
GB1478943A (en) * 1975-01-09 1977-07-06 Fiber Materials Metal/graphite fibre composite
US4024902A (en) * 1975-05-16 1977-05-24 Baum Charles S Method of forming metal tungsten carbide composites
DE2714906A1 (de) * 1977-04-02 1978-10-05 Wahl Verschleiss Tech Verklammerung fuer gusstuecke

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0476496A1 (fr) * 1990-09-20 1992-03-25 Magotteaux International Procédé de fabrication d'une pièce de fonderie bimétallique et pièce d'usure réalisée par ce procédé
BE1004573A4 (fr) * 1990-09-20 1992-12-15 Magotteaux Int Procede de fabrication d'une piece de fonderie bimetallique et piece d'usure realisee par ce procede.
EP0759336A1 (fr) * 1994-05-13 1997-02-26 Komatsu Ltd. Procede de moulage de pieces resistant a l'usure
EP0759336A4 (fr) * 1994-05-13 1997-03-12

Also Published As

Publication number Publication date
CA1159627A (fr) 1984-01-03
WO1981001673A1 (fr) 1981-06-25
GB2065523B (en) 1983-05-25
DE3063917D1 (en) 1983-07-28
ATA785879A (de) 1983-11-15
GB2065523A (en) 1981-07-01
EP0030933B1 (fr) 1983-06-22
AT375035B (de) 1984-06-25

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