US20020195223A1 - Metal casting molded body comprising a cast-in hard material body - Google Patents

Metal casting molded body comprising a cast-in hard material body Download PDF

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Publication number
US20020195223A1
US20020195223A1 US10/143,105 US14310502A US2002195223A1 US 20020195223 A1 US20020195223 A1 US 20020195223A1 US 14310502 A US14310502 A US 14310502A US 2002195223 A1 US2002195223 A1 US 2002195223A1
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US
United States
Prior art keywords
casting
hard material
molded body
set forth
metal casting
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.)
Abandoned
Application number
US10/143,105
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English (en)
Inventor
Horst Herbst
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.)
Schwaebische Huettenwerke Automotive GmbH
Original Assignee
Schwaebische Huettenwerke Automotive GmbH
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
Priority claimed from DE10122886A external-priority patent/DE10122886B4/de
Assigned to SCHWABISCHE HUTTENWERKE GMBH reassignment SCHWABISCHE HUTTENWERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HERBST, HORST
Application filed by Schwaebische Huettenwerke Automotive GmbH filed Critical Schwaebische Huettenwerke Automotive GmbH
Publication of US20020195223A1 publication Critical patent/US20020195223A1/en
Priority to US10/920,800 priority Critical patent/US7198209B2/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/003—Shape or construction of discs or rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C7/00—Crushing or disintegrating by disc mills
    • B02C7/11—Details
    • B02C7/12—Shape or construction of discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C2210/00—Codes relating to different types of disintegrating devices
    • B02C2210/02—Features for generally used wear parts on beaters, knives, rollers, anvils, linings and the like
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1005—Pretreatment of the non-metallic additives
    • C22C1/1015—Pretreatment of the non-metallic additives by preparing or treating a non-metallic additive preform
    • C22C1/1021—Pretreatment of the non-metallic additives by preparing or treating a non-metallic additive preform the preform being ceramic

Definitions

  • the invention relates to a metal casting molded body comprising at least one cast-in hard material body, an application of said metal casting molded body and a method for its production.
  • Wear-resistant machining bodies are required for machining materials and work pieces.
  • machining bodies i.e. effecting bodies are required which are wear-resistant on at least their machining surface or multiple machining surfaces.
  • a metal casting molded body comprises at least one effective surface for machining or processing a material, said surface being formed from a compound material.
  • the compound material comprises at least one porous hard material body, into which the casting material is seeped in.
  • the at least one hard material body is, so to speak, impregnated with the casting material.
  • the hard material body exhibits a higher wear-resistance than the casting material, such that through the compound, an effective surface with an increased wear-resistance as compared to the pure casting material is obtained.
  • the compound material preferably possesses a closed, non-porous structure.
  • a wear-resistant iron base alloy forms the matrix.
  • GX 300 CrNiSi 952 and GX 300 CrMoNi may be cited as examples of such a material.
  • Another preferred matrix material is for example GX 300 NiMo3Mg or ADI (austempered ductile iron), whose structure essentially consists of bainite and/or accicular base matter. Structures with bainite and/or accicular base matter are examples of preferred structures.
  • the casting matrix is a bainite structure or a proportion of it has a bainite structure
  • lower bainite with a forming temperature from about 250° C. and up to about 350° C. is preferred—due to its higher viscosity—to an upper bainite, which however is not to be ruled out as a structure.
  • any casting material known from wear-resistant casting bodies for machining material can form the matrix material.
  • the casting material should, however, have a diamond pyramid hardness (Vickers) number of at least 400 HV.
  • the metal casting molded body is preferably used for milling materials and correspondingly forms a grinding body, crushing body or also a breaking body for milling granulate charging material or also larger charging materials.
  • Such wear-resistant casting bodies are preferably used in the food industry, the coating industry, the cement industry and the brickwork industry, just to name some examples.
  • metal casting molded bodies in accordance with the invention can be used as grinding bodies for coal and lime grinding, clinker grinding and for example the production of raw cement meal.
  • a metal casting molded body in accordance with the invention is particularly preferably a wear-resistant casting body for machining material, and here particularly preferably for milling material
  • the invention also relates in general to a hard material metal casting molded body, whose matrix is formed from an iron base alloy.
  • the matrix material is particularly preferably a casting iron material.
  • the compound material which consists only of the casting matrix and the imbedded hard material, or is at least essentially formed from these two materials can for example be advantageously used as a chafing body in brakes, for example in the brakes of wheeled vehicles.
  • the at least one hard material body is preferably a ceramic body consisting of a ceramic material from the group of carbides, oxides and nitrides or a combination of a number of these materials, or containing one of these materials or a combination of a number of these materials as a substantial component.
  • carbides are particularly preferred, wherein this can be one or more carbides of a carbide producer or also carbides of a number of carbide producers from the group consisting of silicon, chromium, tungsten, molybdenum, vanadium, niobium, titanium, zirconium, tantalum, and hafnium, and wherein the carbide content of the ceramic body is at least 20% by weight and at most 70% by weight.
  • the carbide content is at least 30% by weight and at most 60% by weight.
  • the carbide proportion is preferably formed by silicon carbide (SiC), on its own or also in combination with other carbides.
  • the hardness of the hard material body is preferably greater than that of the matrix material. While the diamond pyramid hardness (Vickers) number of the matrix material is not greater than about 800 HV, the hard material body possesses a diamond pyramid hardness (Vickers) number of at least 1000 HV and more preferably of at least 2000 HV. Furthermore, it also preferably possesses a greater resistance to compression than the matrix material. Ceramic hard material bodies of the type cited possess these properties and often exhibit a diamond pyramid hardness (Vickers) number of up to about 3000 HV.
  • the hard material body is open-pored, i.e. it exhibits an open porosity.
  • the pore density of the hard material body should be at least 5 ppi (pores per square inch), but at most 100 ppi.
  • the pore density is particularly preferably at least 10 ppi and at most 50 ppi.
  • the pores preferably exhibit a diameter of at least 20 ⁇ m and at most 1000 ⁇ m.
  • the diameter of the pores is particularly preferably at least 50 ⁇ m and at most 500 ⁇ m.
  • a ceramic hard material body preferably exhibits a foam structure.
  • a ceramic foam body can consist of a ceramic material and can exhibit a structure such as is known from casting filters for metal molten mass, in particular from casting filters for casting iron materials.
  • a casting filter in fact directly represents a particularly preferred hard material body.
  • the hard material body does not have to be especially produced first, but can advantageously be drawn, so to speak, from the rod.
  • a preferred structure a sponge-like.
  • the oxide proportion given in the above table is preferably composed of ceramic oxides and dioxides.
  • the oxide proportion is preferably between 10 and 40% by weight, particularly preferably between 10 and 30% by weight, and the dioxide proportion preferably constitutes 2 to 20% by weight.
  • the oxide proportion is given in the table as a sum of all the oxide proportions.
  • Aluminum oxide (Al 2 O 3 ) in particular is suitable as the oxide, and silicon dioxide (SiO 2 ) in particular as the dioxide.
  • the proportion of oxide is preferably between 10 and 40% by weight, and the proportion of dioxide is preferably between 2 and 20% by weight.
  • the at least one hard material body can be adapted in its shape to the effective surface of the metal casting molded body in accordance with the invention, to be so to speak tailor-made.
  • the compound material is formed with a plurality of hard material bodies which are arranged side-by-side, preferably as tightly as possible side-by-side, on the effective surface of the metal casting molded body, and imbedded in the casting matrix.
  • Each individual hard material body of the plurality of hard material bodies preferably exhibits the following dimensions: the largest length is at least 10 mm and at most 200 mm, the largest width is at least 10 mm and at most 100 mm, and the largest depth is at least 5 mm and at most 50 mm.
  • the hard material bodies can exhibit the shape of simple cuboids, prisms and/or cylindrical bodies.
  • a metal casting molded body in accordance with the invention can comprise one or more imbedded hard material bodies only locally, in particular in an area in which there is an increased danger of wear as compared to other areas.
  • the compound of the hard material body or bodies and the casting matrix can also particularly preferably improve the wear-resistance of the entire effective surface of the metal casting molded body.
  • a method in accordance with the invention for producing a metal casting molded body comprising at least one wear-resistant surface, comprises at least the two following steps: at least one porous hard material body is attached to a casting mould surface in a casting mould, for example by means of one or more mould nails.
  • the casting mould surface to which the at least one hard material body is attached preferably exhibits the shape of the wear-resistant surface of the metal casting molded body. If the at least one hard material body only forms an area of this surface, but the surface in question is to be particularly wear-resistant over a larger area, a number of such hard material bodies are arranged on and attached to the casting mould surface tightly, side-by-side.
  • the casting mould is effused with a molten mass of an iron base material which is wear-resistant when solidified, such that the casting material imbeds the hard material body or bodies and seeps into the hard material body or bodies.
  • the iron base material is preferably a casting iron material of the type which has already been cited as preferred.
  • the at least one hard material body is a ceramic body made of a material known from casting filters for iron base alloys and comprising a structure known from these casting filters. It is preferably a ceramic foam body.
  • the hard material body retains its structure during the casting process, i.e. it is structurally stabile at the casting temperature.
  • the hard material body is structurally stabile up to at least 1400° C., preferably up to at least 1500° C.
  • Ceramic materials exhibit a good thermal fatigue resistance, which ensures good resistance against fragments breaking off during changes in temperature during the production process on the one hand, and on the other also good resistance against changing temperatures in the operational use of the metal casting molded body.
  • ceramic hard material bodies can easily be wetted with conventional casting materials, such that it is possible to produce metal casting molded bodies with the desired closed, non-porous structure of the compound material.
  • the effective or working surface of the grinding body is primarily strained by pressure and the resistance to compression of preferred hard material bodies is higher than that of the matrix material, the matrix material is protected against friction wear and other destruction by the hard material body or bodies, such that the resistance to compression of the grinding body or of a similarly strained metal casting molded body is significantly increased on the effective surface or more generally on the wear-resistant surface as a whole.
  • the compound formed in accordance with the invention comprises the advantage that the mechanical properties of the metal casting molded body are not disrupted by the usually pointed carbides, since due to the smooth-walled porous structure of the hard material body, no interior notch effect occurs in the solidified casting material, i.e. in the base structure of the material.
  • FIG. 1 a metal casting molded body comprising imbedded hard material bodies, in a cross-section
  • FIG. 2 a casting mould comprising hard material bodies laid out in it, for producing a metal casting test body
  • FIG. 3 the cast metal casting test body.
  • FIG. 1 shows a cross-section of a metal casting molded body 1 which in the example embodiment is a grinding plate segment for a grinding gear for grinding granulate materials, for example coal, lime, clinker or raw cement meal.
  • the metal casting molded body 1 can be formed as a cylinder ring segment, such as for example the metal casting test body shown in FIG. 3. Casting as a complete cylinder ring, or as any other grinding body shape, is also conceivable.
  • the casting is static gravity casting, in a casting mould using an overhead feeder 5 .
  • the metal casting molded body 1 comprises a compound material in a layer 3 with a layer thickness of about 20 mm and which is uniformly thick across the entire effective surface.
  • the compound material of this layer consists of a plurality of hard material bodies 7 (FIG. 2) arranged tightly side-by-side, which are permeated by the solidified casting material.
  • the casting material forms a casting matrix 4 in which the hard material bodies 7 are imbedded and form the effective surface 2 when bonded with the casting material.
  • the hard material bodies 7 exhibit an open porosity.
  • the hard material bodies 7 consist of a foam ceramic with high temperature stability which retains its open-pored structure during the casting process, i.e. at the casting temperature of the metal molten mass.
  • the hard material bodies 7 are formed by a foam ceramic, such as are known from casting filters for iron base alloys, preferably casting iron.
  • the pore density of the hard material bodies 7 measured in ppi (pores per square inch), is chosen according to the casting material.
  • a foam ceramic which can be used as a filter for the molten mass in question naturally already exhibits a porosity which is favorable for as complete a permeation as possible, such that adapting essentially poses no problems. Since greater demands are made on the casting filter with regard to through-flow and therefore permeability because of the greater danger of occlusion in filter applications, this demand for complete permeability is easily fulfilled when using casting filter materials.
  • the casting matrix 4 is formed for example from the material GX 300 CrNiSi 952.
  • This and other particularly preferred materials for the casting matrix 4 of the example embodiment, and any other metal casting molded body in accordance with the invention, are quoted in the following Table 2: TABLE 2 casting matrix materials
  • G-X 300 CrNiSi 9 5 2 0.9630 Ni-Hard 4 Predominantly chromium carbide in a martensite base matter, possibly with restaustenite.
  • G-S 300 CrMo 15 3 0.9635 Alloy 15-3 Predominantly chromium carbide in G-X 300 CrMoNi 15 2 1 0.9640 Alloy 15-2-1 a base matter which, according to G-X 260 CrMoNi 20 2 1 0.9645 Alloy 20-2-1 composition and heat treatment, G-X 260 Cr 27 0.9650 predominantly consists of perlite, G-X 300 CrMo 27 1 0.9655 martensite or austenite.
  • FIG. 2 shows a ring segment-shaped casting mould 6 from above, on whose base area hard material bodies 7 are laid tightly side-by-side.
  • the hard material bodies 7 are each formed by a cuboid with a length of 75 mm, a width of 50 mm and a depth of 20 mm.
  • the hard material bodies 7 are attached to the base area of the casting mould 6 in this arrangement using mould nails.
  • Exactly cuboid hard material bodies 7 were used for casting the test body, such as are directly obtainable as ceramic foam casting filter bodies.
  • hard material bodies 7 which are more exactly adjusted to the shape of the effecting surface 2 of the metal casting molded body 1 can of course also be used.
  • the compound material layer 3 can also be formed with a single, homogenous hard layer body.
  • FIG. 3 shows the cast test body after it has been removed from the casting mould 6 .
  • the test body has been ground in the area of a ring segment surface 8 .
  • the surface of the test body formed by the compound material is extremely difficult to grind.
  • the shavings lay mainly in the grinding wheel and not on the test casting body.
  • a significant increase in the wear-resistance of the casting surface could be observed, such as is advantageous for a metal casting molded body 1 for machining material.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Food Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Engineering (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
US10/143,105 2001-05-11 2002-05-10 Metal casting molded body comprising a cast-in hard material body Abandoned US20020195223A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US10/920,800 US7198209B2 (en) 2001-05-11 2004-08-18 Metal casting molded body comprising a cast-in hard material body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10122886A DE10122886B4 (de) 2001-05-11 2001-05-11 Bearbeitungskörper mit eingegossenem Hartstoffkörper zum Zerkleinern eines Aufgabeguts
DE10122886.4-24 2001-05-11

Related Child Applications (1)

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US10/920,800 Continuation US7198209B2 (en) 2001-05-11 2004-08-18 Metal casting molded body comprising a cast-in hard material body

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US20020195223A1 true US20020195223A1 (en) 2002-12-26

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US (2) US20020195223A1 (de)
EP (1) EP1256403A3 (de)
JP (1) JP4275900B2 (de)
CA (1) CA2383171C (de)
DE (1) DE10164975B4 (de)
ZA (1) ZA200203733B (de)

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US10851020B2 (en) 2018-01-23 2020-12-01 Dsc Materials Llc Machinable metal matrix composite and method for making the same
US11001914B2 (en) 2018-01-23 2021-05-11 Dsc Materials Llc Machinable metal matrix composite and method for making the same

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CN111604122B (zh) * 2020-05-26 2021-07-23 佛山兴技源科技有限公司 磨机、辊压机中带有结构陶瓷瓦板的消耗部件及其制作方法
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US20110183759A1 (en) * 2010-01-27 2011-07-28 Chu-Keng Lin Joystick Controller
US10543985B2 (en) * 2015-01-19 2020-01-28 Flsmidth A/S Interlocking wear-resistant panel system
CN110997148A (zh) * 2017-07-27 2020-04-10 蒂森克虏伯工业解决方案股份公司 具有磨损元件的破碎机和用于制造破碎机磨损元件的方法
US10851020B2 (en) 2018-01-23 2020-12-01 Dsc Materials Llc Machinable metal matrix composite and method for making the same
US11001914B2 (en) 2018-01-23 2021-05-11 Dsc Materials Llc Machinable metal matrix composite and method for making the same

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JP4275900B2 (ja) 2009-06-10
JP2003048049A (ja) 2003-02-18
US20050016708A1 (en) 2005-01-27
CA2383171A1 (en) 2002-11-11
CA2383171C (en) 2007-06-26
US7198209B2 (en) 2007-04-03
DE10164975B4 (de) 2009-08-20

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