SE467563B - PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT - Google Patents

PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT

Info

Publication number
SE467563B
SE467563B SE9100042A SE9100042A SE467563B SE 467563 B SE467563 B SE 467563B SE 9100042 A SE9100042 A SE 9100042A SE 9100042 A SE9100042 A SE 9100042A SE 467563 B SE467563 B SE 467563B
Authority
SE
Sweden
Prior art keywords
grinding
grinding element
painting
layer
grains
Prior art date
Application number
SE9100042A
Other languages
Swedish (sv)
Other versions
SE9100042L (en
SE9100042D0 (en
Inventor
G Ranhagen
Original Assignee
Sunds Defibrator Ind Ab
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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Priority to SE9100042A priority Critical patent/SE467563B/en
Publication of SE9100042D0 publication Critical patent/SE9100042D0/en
Priority to PCT/SE1991/000840 priority patent/WO1992011941A1/en
Publication of SE9100042L publication Critical patent/SE9100042L/en
Publication of SE467563B publication Critical patent/SE467563B/en

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • 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
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
    • B22F1/12—Metallic powder containing non-metallic particles
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0026—Matrix based on Ni, Co, Cr or alloys thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/306—Discs

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Powder Metallurgy (AREA)

Description

467 563 extrem hårdhet inneslutna i en matris av mjukare material. 467 563 extreme hardness enclosed in a matrix of softer material.

Uppfinningens närmare kännetecken framgår av patentkraven.The more detailed features of the invention appear from the claims.

Uppfinningen innebär att malelementet eller åtmin- stone ett skikt på dess framsida framställs genom kall- isostatisk pressning av en mekanisk blandning av korn av en hård fas och ett pulver av en mjukare stållegering.The invention means that the grinding element or at least stone a layer on its front is made by cold isostatic pressing of a mechanical mixture of grains of a hard phase and a powder of a softer steel alloy.

Därigenom erhålles en struktur som inte kan uppnås på annat sätt. Kornen bibehåller sin plats i strukturen vid framställningen. Fördelningen av kornen i elementet kan således bestämmas och kontrolleras. Detta innebär vidare att den önskade ytstrukturen kan bibehållas trots det slitage som ofrànkomligen äger rum. Skiktet på malele- mentets framsida skall således ha en tjocklek som minst motsvarar det slitage av malelementets mönster som är acceptabelt med hänsyn till kvaliteten på det malda materialet. Exempel på korn av hård fas är karbider och nitrider av krom, vanadin, molybden, wolfram och titan samt aluminiumoxid. Även diamant är användbart men troligtvis alltför dyrbart i denna applikation.This results in a structure that cannot be achieved another way. The grains retain their place in the structure at the petition. The distribution of the grains in the element can thus determined and controlled. This means further that the desired surface structure can be maintained nonetheless wear and tear that inevitably takes place. The layer of paint the front of the item shall thus have a thickness of at least corresponds to the wear of the pattern of the grinding element which is acceptable with regard to the quality of the ground the material. Examples of hard phase grains are carbides and nitrides of chromium, vanadium, molybdenum, tungsten and titanium and alumina. Diamond is also useful though probably too expensive in this application.

Hårdheten på kornen skall överstiga 1000 HV (Vickers) och kornstorleken är lämpligen 0,05-0,8 mm.The hardness of the grains must exceed 1000 HV (Vickers) and the grain size is suitably 0.05-0.8 mm.

Kornens hårdhet skall således överstiga hárdheten på de föroreningar, exvis sand, som kan medfölja det material som skall malas. Kornstorleken måste dock avpassas till geometrin hos det aktuella malelementet. Kornen bör ha en rundad, företrädesvis sfärisk form. Andra former kan dock inte uteslutas. , Stållegeringen som utgör den matris i vilken kornen är inneslutna skall ha en lägre hårdhet än kornen. Hård- heten bör vara 250-800 HV, dvs stål som konventionellt används för tillverkning av malelement. Sådant stål- material kan exempelvis utgöras av en legering innehål- lande 0,05-l,7% C, 16-19% Cr, 0-l,0% Mo och 0-2,0% Ni. De hårdare kornen bör därvid utgöra 10-50 vikts-%.The hardness of the grains must thus exceed the hardness of the contaminants, such as sand, that may accompany the material to be ground. However, the grain size must be adapted to the geometry of the paint element in question. The grains should have one rounded, preferably spherical shape. Other forms can, however not excluded. , The steel alloy that forms the matrix in which the grains are enclosed shall have a lower hardness than the grains. Hard- should be 250-800 HV, ie steel as conventional used for the manufacture of grinding elements. Such steel material may, for example, consist of an alloy containing 0.05-1.7% C, 16-19% Cr, 0-1.0% Mo and 0-2.0% Ni. The the harder grains should then be 10-50% by weight.

Framställningen av malelementet sker genom att de hårda kornen-mekaniskt blandas med stållegeringen i pulverform och placeras i en form med ett utseende som motsvarar malelementets mönster. Därefter utsätts denna 5)» '- 467 563 blandning för kallisostatisk pressning med ett presstryck på 2500-7000 bar, lämpligen 4000-7000 bar, så att korn och pulver sammanfogas till ett enhetligt skikt. Kallisosta- tisk pressning som är känd i och för sig innebär att pressning sker utan uppvärmning och att presstrycket fördelas jämnt över föremålets alla ytor. Detta kan exvis göras genom att trycket förmedlas av en vätska som omger formen som är utformad av eftergivande material. Lämpligen kan flera formar pressas samtidigt. Efter pressningen sker sintring och eventuell värmebehandling av materialet.The grinding element is produced by the hard grains-mechanically mixed with the steel alloy in powder form and placed in a mold with an appearance that corresponds to the pattern of the grinding element. Then this is exposed 5) » '- 467 563 mixture for cold isostatic pressing with a press pressure at 2500-7000 bar, preferably 4000-7000 bar, so that barley and powder is joined to form a uniform layer. Kallisosta- pressure which is known per se means that pressing takes place without heating and that the pressing pressure distributed evenly over all surfaces of the object. This can, for example is done by the pressure being transmitted by a surrounding liquid the shape formed of resilient material. Conveniently several molds can be pressed simultaneously. After the pressing takes place sintering and possible heat treatment of the material.

Det på detta sätt framställda skiktet kan utgöra hela malelementet eller en del av detta. Eftersom malele- mentets framsida är den del som utsätts för slitaget kan det vara lämpligt att kombinera det pressade skiktet med en baksida som gjutits på konventionellt sätt till ett komplett malelement. Framsidan får då den för malningen eftersträvade strukturen medan baksidan kan bearbetas pà vanligt sätt och förses med fästanordningar för fastsätt- ning i malapparaten.The layer produced in this way can constitute all or part of the grinding element. Since malele- the front of the item is the part that is exposed to wear can it may be appropriate to combine the pressed layer with a backing molded in a conventional manner to a complete paint element. The front then gets it for grinding sought after structure while the back can be machined on in the usual way and be fitted with fastening devices for ning in the malapparaten.

Sammanfogningen av fram- och baksida utföres lämpligen på så sätt att den gjutna baksidan placeras i formen tillsammans med den pulver/korn-blandning som skall utgöra malelementets framsida varvid sammanfogningen sker samtidigt med pulverpressningen.The joining of the front and back is performed preferably in such a way that the cast backing is placed in the mold together with the powder / grain mixture to be constitute the front of the grinding element, whereby the joining takes place at the same time as the powder pressing.

För att jämföra nötningsmotstándet hos ett element enligt uppfinningen och ett konventionellt element har försök gjorts enligt följande.To compare the abrasion resistance of an element according to the invention and a conventional element has attempts have been made as follows.

Ett provstycke framställt enligt uppfinningen, varvid korn av aluminiumoxid användes, jämfördes med ett provstycke i form av en gjuten konventionell stållegering.A specimen prepared according to the invention, using alumina grains, was compared to a test piece in the form of a cast conventional steel alloy.

Vid användning av en standardiserad nötningsprovmetod, där viktsförlusten hos provstycket utgör mått på nötningen, uppmättes en viktsförlust på i medeltal 320 mg för det konventionella provstycket och 170 mg för provstycket enligt uppfinningen.When using a standardized abrasion test method, where the weight loss of the test piece is a measure of the wear, a weight loss of on average 320 mg was measured for it conventional test piece and 170 mg for the test piece according to the invention.

Uppfinningen är givetvis inte begränsad till de ovan beskrivna utföringsformerna utan kan varieras inom ramen för uppfinningstanken.The invention is of course not limited to those above described embodiments but can be varied within the scope for the inventive idea.

Claims (5)

ch -4 C71 CI\ C N ”i Patentkravch -4 C71 CI \ C N ”in Patent Claim 1. Malelement för skivraffinörer för malning av fiber- material där malelementet på framsidan är utformat med ett mönster av malorgan i form av upphöjningar eller ojämn- heter, varvid åtminstone ett skikt på elementets framsida innefattar 10-50 vikts-% korn med en storlek av 0,05-0,8 mm och en hårdhet överstigande 1000 HV (Vickers), k ä n n e t e c k n a t a v att kornen i nämnda skikt genom kallisostatisk pressning och efterföljande sintring är inneslutna i en matris som utgöres av en stàllegering innehållande 0,05-1,7% C, 16-19% Cr, 0-1,0% Mo och 0-2,0% Ni och som har en hårdhet av 250-800 HV.Grinding elements for disc refiners for grinding fibrous material, the grinding element on the front being formed with a pattern of grinding means in the form of ridges or irregularities, wherein at least one layer on the front of the element comprises 10-50% by weight of grains with a size of 0.05-0.8 mm and a hardness exceeding 1000 HV (Vickers), characterized in that the grains in said layer are enclosed in a matrix consisting of a steel alloy containing 0.05-1.7 by callisostatic pressing and subsequent sintering. % C, 16-19% Cr, 0-1.0% Mo and 0-2.0% Ni and having a hardness of 250-800 HV. 2. Malelement enligt kravet 1, k ä n n e t e c k n a t a v att nämnda skikt utgör hela malelementet.Grinding element according to claim 1, characterized in that said layer constitutes the entire grinding element. 3. Malelement enligt kravet 1, k ä n n e t e c k n a t a v att nämnda skikt utgör malelementets framsida medan baksidan utgöres av en konventionellt gjuten stàllegering.Grinding element according to claim 1, characterized in that said layer constitutes the front side of the grinding element while the back side consists of a conventionally cast steel alloy. 4. Sätt för framställning av ett malelement som på framsidan är utformat med ett mönster av malorgan i form av upphöjningar eller ojämnheter, vilket malelement är avsett för skivraffinörer för malning av fibermaterial, k ä n n e t e c k n a t a v att korn med en storlek av 0,05-0,8 mm och en hårdhet överstigande 1000 HV (Vickers) samt pulver av en stàllegering innehållande 0,05-1,7% C, 16-19% Cr, 0-1,0% Mo och 0-2,0% Ni blandas och placeras i en form med ett utseende som motsvarar malelementets mönster, att denna blandning utsâttes för kallisostatisk pressning med ett presstryck på 2500-7000 bar så att korn och pulver sammanfogas till ett skikt varefter skiktet sintras, varvid skiktet utgör hela malelementet eller dess framsida som kombineras med en baksida till ett helt malelement.4. A method for producing a grinding element which is formed on the front with a pattern of grinding means in the form of ridges or irregularities, which grinding element is intended for disc refiners for grinding fibrous material, characterized in that grains with a size of 0.05-0 , 8 mm and a hardness exceeding 1000 HV (Vickers) and powder of a steel alloy containing 0.05-1.7% C, 16-19% Cr, 0-1.0% Mo and 0-2.0% Ni are mixed and placed in a mold with an appearance corresponding to the pattern of the grinding element, that this mixture is subjected to callisostatic pressing with a pressing pressure of 2500-7000 bar so that grains and powder are joined to a layer after which the layer is sintered, the layer constituting the whole grinding element or its front side combined with a backing to a whole grinding element. 5. Sätt enligt kravet 4, k ä n n e t e c k n a t a v att en konventionellt gjuten stàllegering avsedd att utgöra malelementets baksida placeras i formen tillsammans med pulver/korn-blandningen som är avsedd att utgöra malelementets framsida, varvid fram- och baksida samman- fogas genom pressningen.' (Jow5. A method according to claim 4, characterized in that a conventionally cast steel alloy intended to constitute the back of the grinding element is placed in the mold together with the powder / grain mixture intended to constitute the front of the grinding element, the front and back being joined by the pressing. ' (Jow
SE9100042A 1991-01-08 1991-01-08 PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT SE467563B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SE9100042A SE467563B (en) 1991-01-08 1991-01-08 PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT
PCT/SE1991/000840 WO1992011941A1 (en) 1991-01-08 1991-12-06 Refining element and method of manufacturing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9100042A SE467563B (en) 1991-01-08 1991-01-08 PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT

Publications (3)

Publication Number Publication Date
SE9100042D0 SE9100042D0 (en) 1991-01-08
SE9100042L SE9100042L (en) 1992-07-09
SE467563B true SE467563B (en) 1992-08-10

Family

ID=20381549

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9100042A SE467563B (en) 1991-01-08 1991-01-08 PAINTING ELEMENTS FOR DISC REFINERS FOR PAINTING FIBER MATERIALS AS WELL AS PREPARING A PREPARATION OF A PAINTING ELEMENT

Country Status (2)

Country Link
SE (1) SE467563B (en)
WO (1) WO1992011941A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707677B1 (en) * 1993-07-13 1995-08-25 Technogenia Plate for defibering or refining paper pulp, and process for its production.
JP3381487B2 (en) * 1995-11-06 2003-02-24 株式会社日立製作所 Roller for nuclear power plant control rod drive and control rod drive using the same
US6245289B1 (en) 1996-04-24 2001-06-12 J & L Fiber Services, Inc. Stainless steel alloy for pulp refiner plate
US5824265A (en) * 1996-04-24 1998-10-20 J & L Fiber Services, Inc. Stainless steel alloy for pulp refiner plate
MXNL05000017A (en) * 2005-02-22 2006-03-23 Julio Antonio Trevino Morales Refining segment and manufacturing process thereof.
CN105986500B (en) * 2015-02-06 2018-03-06 上海东冠纸业有限公司 A kind of household paper pulp processing method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE402019B (en) * 1975-04-09 1978-06-12 Uddeholms Ab GRINDING SHEET FOR DISC MILLS AND KIT FOR MAKING THE GRINDING SHEET
DK165775C (en) * 1985-07-18 1993-06-14 Teknologisk Inst PROCEDURE FOR MANUFACTURING A SLOT FOR A EQUIPMENT

Also Published As

Publication number Publication date
SE9100042L (en) 1992-07-09
WO1992011941A1 (en) 1992-07-23
SE9100042D0 (en) 1991-01-08

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