EP0220183A1 - Herstellungsverfahren für raffiniersegmente - Google Patents

Herstellungsverfahren für raffiniersegmente

Info

Publication number
EP0220183A1
EP0220183A1 EP19850903415 EP85903415A EP0220183A1 EP 0220183 A1 EP0220183 A1 EP 0220183A1 EP 19850903415 EP19850903415 EP 19850903415 EP 85903415 A EP85903415 A EP 85903415A EP 0220183 A1 EP0220183 A1 EP 0220183A1
Authority
EP
European Patent Office
Prior art keywords
refiner
segments
refiner segments
manufacture
processing
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Withdrawn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
EP19850903415
Other languages
English (en)
French (fr)
Inventor
Per Viking Peterson
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.)
SCA Development AB
Original Assignee
SCA Development 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 SCA Development AB filed Critical SCA Development AB
Publication of EP0220183A1 publication Critical patent/EP0220183A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • This invention relates to a method at the manufacture of refiner segments for the mechanical processing of cellulose-containing material.
  • the invention especially relates to a method of treating the active surfaces of refiner segments in order to provide them with a surface structure and hardness, which facilitate the processing of the cellulose material and provide it with the properties desired.
  • Processing of cellulose material can imply defibration of wood chips, beating of already partially defibrated chips or cellulose pulp.
  • Apparatuses for the mechanical processing of cellulose-containing material can be of different types, for example such with conically designed beating surfaces, so-called conic refiners, or also so-called disc refiners with beating members of disc configuration.
  • the members are provided with exchangeable wearing parts, so-called refiner segments, which are designed differently according to the type of work to which the cellulose material is to be subjected.
  • the surfaces of the refiner segments can be substantially plane or formed as a portion of a conic shell surface. They can, for example, be designed so as to have, counted in radial direction, differently arranged zones 2,3,4 according to Fig. 1, which have different functions in respect of processing and conveying the material. These zones can be provided with patterns of bars and intermediate grooves according to the Figure, but can also be entirely without pattern.
  • the present invention relates to the designing of the processing surfaces, because it was found that, irrespective of the geometric design of the refinerr segments, their surface structures and hardness are of essential importance for the quality of the resulting product and for the energy consumption at the refining/beating.
  • the processing surfaces of the segment are provided with an abrasive consisting of silicon, aluminium oxide, silicon carbide, zirconium oxide or tungsten carbide.
  • the material grains can have a size of between 140 micrometer and 0.25 cm.
  • the use of such material also had been proposed previously, for example in US-PS 3 482 791.
  • the pattern of the segment i.e. the dimensions of bars and grooves, and also the groove depth, is of decisive importance for the energy consumption.
  • a report thereon is included in our SE-PS 426 294. In order to achieve the accuracy required, we have proposed to produce the grooves by so-called spark machining.
  • a refiner segment is provided with a pattern, which in principle can be designed as shown in Figs. 1 and 2.
  • the segment 1 shown comprises three zones 2, 3 and 4, respectively, defined in radial direction, where the final processing of the cellulose material takes place in the outer zone 4.
  • the refiner segments are manufactured of a material, which is highly resistive to wear, corrosion and erosion.
  • a steel material can be mentioned which contains the alloying elements as follows:
  • the steel material can also contain a certain amount of titanium, preferably 1-5% by weight, in the form of very small titanium carbide grains.
  • the bars and grooves usually are formed in connection with the casting of the refiner segments.
  • the beating surface of the bars thereafter is produced conventionally by face grinding. It was found essential according to the invention, that especially the surface and edges of the bars are provided with a special structure and hardness. This is important for processing the cellulose material in the manner desired and to facilitate the transfer of energy to the material. In view of the great stresses, to which the refiner segments are subjected during the refining process, it is important that the surface structure suitable for the beating work has a sufficient hardness, and that this hardness extends sufficiently deep down into the material. By selecting a suitable material, refiner segments are obtained which are sufficiently resistant to wear, so that the original surface structure suitable for the beating work is maintained efficient during a sufficiently long operating time of the segments.
  • spark machining a structure is obtained, which in the direction of its depth can be divided into separate zones, viz. a melting zone, a hardened or re-hardened zone, and beneath it an annealed zone, which gradually transforms to the unaffected matrix in the material.
  • the parameter combination at the spark machining must be chosen in a special way.
  • the parameters in question are impulse time, interval time, period, open circuit voltage, working voltage and current intensity. Of these parameters the impulse time must be deemed the most important factor for determining the thickness of the different zones. The longer the burning time used, the greater is the depth obtained. This is illustrated by the values as follows:
  • R max designates the greatest depth
  • R a designates the arithmetic mean value.
  • the thickness of the molten zone substantially is independent of the material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Paper (AREA)
  • Crushing And Grinding (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19850903415 1984-07-04 1985-05-31 Herstellungsverfahren für raffiniersegmente Withdrawn EP0220183A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8403543 1984-07-04
SE8403543A SE8403543D0 (sv) 1984-07-04 1984-07-04 Sett vid framstellning av malsegment

Publications (1)

Publication Number Publication Date
EP0220183A1 true EP0220183A1 (de) 1987-05-06

Family

ID=20356440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850903415 Withdrawn EP0220183A1 (de) 1984-07-04 1985-05-31 Herstellungsverfahren für raffiniersegmente

Country Status (6)

Country Link
EP (1) EP0220183A1 (de)
JP (1) JPS61502043A (de)
AU (1) AU4548185A (de)
NO (1) NO860792L (de)
SE (1) SE8403543D0 (de)
WO (1) WO1986000546A1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4951888A (en) * 1989-08-24 1990-08-28 Sprout-Bauer, Inc. Refining element and method of manufacturing same
SE470089B (sv) * 1992-04-08 1993-11-08 Sunds Defibrator Ind Ab Malelement för en skivraffinör
AT15071U1 (de) * 2015-11-04 2016-12-15 Gebrüder Busatis Gesellschaft M B H Zerkleinerungszahnscheibe für einen Körnerprozessor
AT519308A1 (de) * 2016-10-28 2018-05-15 Gebrueder Busatis Ges M B H Förder- und Aufbereitungswalze für eine Erntemaschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2974215A (en) * 1959-05-01 1961-03-07 Inoue Kiyoshi Machining method and means
US3941970A (en) * 1974-05-13 1976-03-02 Precision Tool & Machine Co. Feed roll and method of imparting a rough texture to the surface thereof
GB1541058A (en) * 1975-04-09 1979-02-21 Uddeholms Ab Pulp refining apparatus
CH592477A5 (de) * 1975-06-11 1977-10-31 Escher Wyss Gmbh
SU860982A1 (ru) * 1978-01-05 1981-09-07 Куйбышевский институт инженеров железнодорожного транспорта Способ упрочнени поверхности чугунных деталей
US4233485A (en) * 1978-07-13 1980-11-11 Mitsubishi Denki Kabushiki Kaisha Process for electrical discharge machining of cylindrical work
SE426294B (sv) * 1982-02-03 1982-12-27 Sca Development Ab Malsegment
SE432535B (sv) * 1983-03-30 1984-04-09 Sca Development Ab Sett att framstella malsegment for defibrering resp malning av cellulosahaltigt material

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8600546A1 *

Also Published As

Publication number Publication date
AU4548185A (en) 1986-02-10
SE8403543L (de) 1986-01-05
JPS61502043A (ja) 1986-09-18
SE8403543D0 (sv) 1984-07-04
NO860792L (no) 1986-03-03
WO1986000546A1 (en) 1986-01-30

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Legal Events

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Effective date: 19870306

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Inventor name: PETERSON, PER, VIKING