SE432535B - Method of preparing a grinding segment for defibration or grinding of cellulose-containing material - Google Patents

Method of preparing a grinding segment for defibration or grinding of cellulose-containing material

Info

Publication number
SE432535B
SE432535B SE8301763A SE8301763A SE432535B SE 432535 B SE432535 B SE 432535B SE 8301763 A SE8301763 A SE 8301763A SE 8301763 A SE8301763 A SE 8301763A SE 432535 B SE432535 B SE 432535B
Authority
SE
Sweden
Prior art keywords
grinding
segment
defibration
grooves
cellulose
Prior art date
Application number
SE8301763A
Other languages
Swedish (sv)
Other versions
SE8301763L (en
SE8301763D0 (en
Inventor
P V Peterson
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
Priority to SE8301763A priority Critical patent/SE432535B/en
Publication of SE8301763D0 publication Critical patent/SE8301763D0/en
Publication of SE8301763L publication Critical patent/SE8301763L/en
Publication of SE432535B publication Critical patent/SE432535B/en

Links

Classifications

    • 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
    • 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

Abstract

Preparation of grinding segment having arms and grooves, for defibration or grinding of cellulose-containing material, is conventionally done by casting. It has been found that the resulting defibration or grinding effect and the energy consumption depend in part on the arms and grooves being configured in a special way and in part on the configuration having great precision. This is done according to the invention in that the grinding segment is prepared by a spark machining method. <IMAGE>

Description

15 20 25 30 35, 40 8301763-2 2 närmare av figur 2 där bommarnas bredd, spårens bredd respektive spårens djup betecknas med B, 5 respektive D. 15 20 25 30 35, 40 8301763-2 2 closer to Figure 2 where the width of the booms, the width of the grooves and the depth of the grooves are denoted by B, 5 and D, respectively.

Det är även väsentligt att malsegmenten är tillverkade av ett ma- terial som är mycket motståndskraftigt mot slitage, korrosion och errosion.It is also essential that the grinding segments are made of a material that is very resistant to wear, corrosion and erosion.

Som exempel på ett sådant material kan nämnas ett stålmaterial innehållande följande legeringsämnen.An example of such a material is a steel material containing the following alloying elements.

Legeringsämne Vikts-% C 0,5 - 1,7 Si 0,5 - 1,0 Mn 0,3 - 0,8 Cr 16 - 19 Ni 1,0 - 2,1 Mo 0,7 - 1,0 Dessutom kan stålmaterialet innehålla en viss mängd titan, lämpligen 1 - 5 vikts-%, i form av mycket små titankarbídkorn.Alloy substance Weight% C 0.5 - 1.7 Si 0.5 - 1.0 Mn 0.3 - 0.8 Cr 16 - 19 Ni 1.0 - 2.1 Mo 0.7 - 1.0 In addition, the steel material contain a certain amount of titanium, preferably 1 - 5% by weight, in the form of very small titanium carbide grains.

Vanligen formas bommarna och spåren i samband med gjutning av mal- segmenten. Bommarnas bearbetande yta åstadkommas därefter genom planslipníng.Usually the booms and grooves are formed in connection with casting of the grinding segments. The machining surface of the booms is then achieved by planar grinding.

Med ett sådant framställningsförfarande är det knappast möjligt att uppnå någon större noggrannhet på bommarnas och spårens dimensioner över malseg- mentet.With such a manufacturing process, it is hardly possible to achieve any greater accuracy in the dimensions of the booms and grooves over the grinding segment.

Vid förfarandet enligt uppfinningen tillverkades först genom gjut- *ning av lämplig legering ett ämne för malsegmentet som sedan planslipades.In the process according to the invention, a blank for the milling segment was first manufactured by casting a suitable alloy, which was then ground ground.

Såsom elektrod användes grafit som genom fräsning formades till ett verktyg med ett mönster som var negativt i förhållande till det malskívemönster som skulle framställas. Det slipade, mönsterlösa malsegmentet, arbetsstycket, fixerades och positíonerades på gnístmaskinens arbetsbord och anslöts till positiv pol. Verktyget fixerades i sänkgnistmaskinens verktygschuck och an- slöts till maskinens negativa pol. De munstycken som användes för bortspol- ning avavverkatmaterial ställdes upp så att vätskestrålarna riktades längs med arbetsstyckets yta. Gnistmaskinens arbetstank fylldes sedan med dielek- trikum så att vätskeytan befann sig 5 cm ovanför arbetsstyckets övre yta.As the electrode, graphite was used which was formed by milling into a tool with a pattern which was negative in relation to the grinding wheel pattern to be produced. The ground, patternless grinding segment, the workpiece, was fixed and positioned on the work table of the grinding machine and connected to a positive pole. The tool was fixed in the tool chuck of the immersion spark machine and connected to the negative pole of the machine. The nozzles used for rinsing off felled material were set up so that the liquid jets were directed along the surface of the workpiece. The spark machine's working tank was then filled with dielectric so that the liquid surface was 5 cm above the upper surface of the workpiece.

Maskinens parameterkombinationer ställdes in enligt följande Tomgångsspänning Utom' = 100 V Arbetsspänning Varb_ = 50 V Impulstid 'ti = 150 us _,Pmßüd tp = 60us ' Gnistgapct bestäms av arbetsspänningen, vilken styr servoförstärkare som i sin tur styr servoventilerna. Medelst ventilerna och maskinens hydraul- system håller rätt avstånd mellan elektrod och verktyg under avverkningen.The machine parameter combinations were set according to the following Idle voltage Except '= 100 V Operating voltage Varb_ = 50 V Pulse time' ti = 150 us _, Pmßüd tp = 60us' Spark gap is determined by the operating voltage, which controls servo amplifiers which in turn control the servo valves. By means of the valves and the machine's hydraulic system, the correct distance is maintained between the electrode and the tool during felling.

Uppfinningen är inte begränsad till den visade utföringsformen utan kan varieras inom ramen för uppfinningstanken.The invention is not limited to the embodiment shown but can be varied within the scope of the inventive concept.

Claims (5)

10 15 20 3 8301765-2 Patentkrav10 15 20 3 8301765-2 Patent claims 1. Sätt att framställa malsegment för defibrering resp malning av cellulosahaltigt material, företrädesvis i form av flis, vilket segment uppvisar bommar ochapåranordnade i ett särskilt mönster för bearbetning av materialet, k ä n n e t e c k n a t därav, att man företrädesvis genom gjutning, framställer ett plant ämne för segmentet och att det önskade mönstret eller del därav åstadkommas genom att spåren i segmen- tet urtages genom en i och för sig förut känd gnistbearbetningsmetod.Method for producing grinding segments for defibration or grinding of cellulosic material, preferably in the form of chips, which segment has booms and grooves arranged in a special pattern for processing the material, characterized in that a flat blank is preferably produced by casting for the segment and that the desired pattern or part thereof is achieved by removing the grooves in the segment by a spark machining method known per se. 2. Sätt enligt kravet 1, k ä n n e t e c k n a t därav, att ämnet planslipas före gnístbearbetningen.2. A method according to claim 1, characterized in that the substance is ground ground before the spark machining. 3. Sätt enligt kravet 1, k ä n n e t e c k n a t därav, att gnistbearbetningen sker genom sänkgnistning.3. A method according to claim 1, characterized in that the spark processing takes place by countersinking. 4. Sätt enligt kraven 1 - 3, k ä n n e t e c k n a t därav att man som ämne använder ett stålmaterial innehållande Följande lege- ringsämnen C 0.5 ~ 1.7 Si 0.5 - 1.Û " Mn 0.3 - 0.8 " Cr 16 - 19 " Ni 1.0 - 2.1 " Mo 0.7 - 1.0 "4. A method according to claims 1 - 3, characterized in that a steel material containing the following alloying substances C 0.5 ~ 1.7 Si 0.5 - 1.Û "Mn 0.3 - 0.8" Cr 16 - 19 "Ni 1.0 - 2.1 is used as the substance. "Mo 0.7 - 1.0" 5. Sätt enligt kravet 4, stålmaterialet dessutom innehåller titan; företrädesvis i en mängd av viktprocent k ä n n e t e c k n a t därav, att 1 - 5 víktprocent, t ex i Form av små títankarbidkorn.A method according to claim 4, the steel material further contains titanium; preferably in an amount of weight percent, characterized in that 1 - 5 weight percent, for example in the form of small titanium carbide grains.
SE8301763A 1983-03-30 1983-03-30 Method of preparing a grinding segment for defibration or grinding of cellulose-containing material SE432535B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE8301763A SE432535B (en) 1983-03-30 1983-03-30 Method of preparing a grinding segment for defibration or grinding of cellulose-containing material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE8301763A SE432535B (en) 1983-03-30 1983-03-30 Method of preparing a grinding segment for defibration or grinding of cellulose-containing material

Publications (3)

Publication Number Publication Date
SE8301763D0 SE8301763D0 (en) 1983-03-30
SE8301763L SE8301763L (en) 1983-08-04
SE432535B true SE432535B (en) 1984-04-09

Family

ID=20350603

Family Applications (1)

Application Number Title Priority Date Filing Date
SE8301763A SE432535B (en) 1983-03-30 1983-03-30 Method of preparing a grinding segment for defibration or grinding of cellulose-containing material

Country Status (1)

Country Link
SE (1) SE432535B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000546A1 (en) * 1984-07-04 1986-01-30 Sca Development Aktiebolag Method at the manufacture of refiner segments

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1986000546A1 (en) * 1984-07-04 1986-01-30 Sca Development Aktiebolag Method at the manufacture of refiner segments

Also Published As

Publication number Publication date
SE8301763L (en) 1983-08-04
SE8301763D0 (en) 1983-03-30

Similar Documents

Publication Publication Date Title
SE426294B (en) target segments
CN107931759A (en) A kind of internal combustion catholyte milling device
SE432535B (en) Method of preparing a grinding segment for defibration or grinding of cellulose-containing material
FI70529C (en) SAETT ATT FRAMSTAELLA MALSEGMENT
Malosse Conditions d'Usinage Par Electro-Erosion de Differentes Nuances de Carbure Metallique(Conditions for the Machining of Various Types of Metal Carbides by Electroerosion)
JPS569129A (en) Method and apparatus for wire cut electric discharge machining
CN110983326A (en) Turbine blade laser zoning alloying method based on scanning galvanometer
JPS5590229A (en) Electrochemical machining method for turbine blade wheel
JPS56119371A (en) Grinding method
MALOSSE Conditions for the machining of various types of metal carbides by electroerosion[Final Report]
JPS57149122A (en) Machining method of electrode for honeycomb seal machining electric discharge machine
SU1009620A1 (en) Method of monitoring tool cutting blade condition
SU1710317A2 (en) Method for truing abrasive wheel by diamond roller
RU1732561C (en) Method for strengthening with electric pulse discharges
SU1286362A1 (en) Method of combined working
JPS5695528A (en) Boring reamer having end mill edge
SU1668057A1 (en) Method for milling workpiece surfaces
SU1389994A1 (en) Method of grinding parts
SU860975A1 (en) Method of electric discharge working
SU1534074A1 (en) Method of reconditioning treatment of cutting tool
KUNIEDA et al. Simulation of machining accuracy in die-sinking EDM
JPS5621727A (en) Electric discharge machining method
Muller et al. Precision Milling of Grey Cast Iron Instead of Surface Grinding
Glukhikh et al. A Group Technology of Machining Disks of Working Wheels of Turbines
RU1798382C (en) Method of stainless and heat-resistant steels surface preparation for cutting working

Legal Events

Date Code Title Description
NUG Patent has lapsed

Ref document number: 8301763-2

Effective date: 19910117

Format of ref document f/p: F