EP0220183A1 - Procede de fabrication de segments de raffineur conique - Google Patents
Procede de fabrication de segments de raffineur coniqueInfo
- 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- Withdrawn
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.
Abstract
L'invention concerne un procédé de fabrication de segments de raffineurs coniques; on donne aux barres des segments une surface rugueuse et dure par électroérosion.
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 (fr) | 1987-05-06 |
Family
ID=20356440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19850903415 Withdrawn EP0220183A1 (fr) | 1984-07-04 | 1985-05-31 | Procede de fabrication de segments de raffineur conique |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0220183A1 (fr) |
JP (1) | JPS61502043A (fr) |
AU (1) | AU4548185A (fr) |
NO (1) | NO860792L (fr) |
SE (1) | SE8403543D0 (fr) |
WO (1) | WO1986000546A1 (fr) |
Families Citing this family (4)
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)
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 (fr) * | 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 |
-
1984
- 1984-07-04 SE SE8403543A patent/SE8403543D0/xx not_active Application Discontinuation
-
1985
- 1985-05-31 EP EP19850903415 patent/EP0220183A1/fr not_active Withdrawn
- 1985-05-31 JP JP50297485A patent/JPS61502043A/ja active Pending
- 1985-05-31 WO PCT/SE1985/000228 patent/WO1986000546A1/fr unknown
- 1985-05-31 AU AU45481/85A patent/AU4548185A/en not_active Abandoned
-
1986
- 1986-03-03 NO NO860792A patent/NO860792L/no unknown
Non-Patent Citations (1)
Title |
---|
See references of WO8600546A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPS61502043A (ja) | 1986-09-18 |
SE8403543D0 (sv) | 1984-07-04 |
AU4548185A (en) | 1986-02-10 |
NO860792L (no) | 1986-03-03 |
WO1986000546A1 (fr) | 1986-01-30 |
SE8403543L (fr) | 1986-01-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT DE FR GB SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19870306 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PETERSON, PER, VIKING |