AU710348B2 - Grinding roll and method for operation and repair thereof - Google Patents

Grinding roll and method for operation and repair thereof Download PDF

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Publication number
AU710348B2
AU710348B2 AU17849/97A AU1784997A AU710348B2 AU 710348 B2 AU710348 B2 AU 710348B2 AU 17849/97 A AU17849/97 A AU 17849/97A AU 1784997 A AU1784997 A AU 1784997A AU 710348 B2 AU710348 B2 AU 710348B2
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AU
Australia
Prior art keywords
roll
profiled bodies
grinding
roll surface
wear
Prior art date
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Ceased
Application number
AU17849/97A
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AU1784997A (en
Inventor
Johann Dipl.-Ing. Knecht
Norbert Dipl.-Ing. Patzelt
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of AU1784997A publication Critical patent/AU1784997A/en
Application granted granted Critical
Publication of AU710348B2 publication Critical patent/AU710348B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00Crushing or disintegrating by roller mills
    • B02C4/28Details
    • B02C4/30Shape or construction of rollers
    • B02C4/305Wear resistant rollers

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Description

2 Grinding roll and method for operation and repair thereof The invention relates to a grinding roll according to the preamble to Claim 1, and also to a method for operation and repair thereof according to the preamble to Claim 8.
Grinding rolls of the type referred to, in the preamble to Claim 1 are known for example from EU-BI 0 516 952. In the operation of such grinding rolls the spaces between the pinshaped profiled bodies projecting with a part of their length over the roll surface are filled with material for comminution which is fed into the material bed roll mill, and thus this constitutes a certain autogenic protection against wear for the surface of the roll. However, in the course of the operating time the pin-shaped profiled body are worn increasingly and as a consequence of this the material of the roll body, i.e. the base material, which forms the surface of the roll is then subjected to unavoidable wear which is generally greater than the already considerable wear on the profiled bodies. The material hitherto used for the surface of the rol 1 body has a hardness of 40 to 45 HRc (Rockwell I hardness).
If the wear on the pin-shaped profiled bodies and the roll surface has reached a certain amount, then a repair of the wear usually takes place in such a way that first of all the profiled bodies are removed, which in the case of fixing by glueing generally involves burning off of the entire surface.
Then the roll surface is provided with a thick, often multilayer build-up welding which must then, however, be face turned in order to produce the required cylindrical roll surface. Finally, in a last operation new pin-shaped profiled bodies must be inserted into the roll surface. Such repair of wear is extraordinarily costly.
The object of the invention, therefore, is to develop a 3 grinding roll and method for operation and repair thereof which permit a substantially more economical repair of wear.
This object is achieved according to the invention by the characterising features of Claims I and 8. Advantageous embodiments of the invention are the subject matter of the subordinate claims.
According to the invention a material with a substantially greater hardness than those which were usual hitherto is used as the material of the roll body forming the roll surface, i.e. as the base material of the grinding roll. According to the invention this hardness is greater than 56 HRc (Rockwell hardness); it is preferably between 60 and 68 HRc, particularly between 62 and 64 HRc.
In this case the grinding roll is kept in comminuting operation until a substantial proportion of all profiled bodies, preferably at least 80%, is completely worn and/or has fallen out of the roll body. For repair of the wear the roll surface is then brought back to a cylindrical shape by partial removal of material, and new recesses are produced in the roll surface and new profiled bodies are inserted into these recesses.
Due to the use of an extraordinarily hard base material the material of the roll body forming the roll surface is worn approximately only to the same extent as the pin-shaped profiled bodies. Thus even in the case of increasing wear of the profiled bodies not only is an autogenic protection against wear of the roll surface maintained (in which moreover material for grinding is deposited between the profiled bodies and thus protects the roll surface), but due to the reduced wear of the base material because of the greater hardness the pin-shaped profiled bodies embedded in the roll surface retain a sufficient anchorage during a substantially longer 4 operating time, so that they are a match for the radially and tangentially acting forces which occur during the grinding operation. Not until the pin-shaped profiled bodies and the roll surface are so far worn that only a small part of the length of the profiled bodies is anchored in the roll body do the profiled bodies finally break away.
Due to the use of a base material with great hardness and thus with relatively high resistance to wear there is still, after individual pin-shaped profiled bodies have fallen out, a sufficiently long operating time remaining in which a further large number of profiled bodies can also reach this critical amount of wear for breaking away, without the base material, i.e. the material of the roll body forming the roll surface, undergoing unacceptably severe wear beforehand. As tests have shown, with suitable dimensioning it is possible without further effort to ensure that a large proportion of the pinshaped profiled bodies break away from the roll surface approximately simultaneously. In this way the very costintensive removal of a large number of profiled bodies during the repair of wear is minimised.
The use of a particularly hard roll body material (in place of the segment material usually used) also provides the advantage of a higher compression strength, which makes the replacement of the pin-shaped profiled bodies easier. In fact, due to the increased compression strength both in the grinding operation and also during any removal of the remaining profiled bodies within the framework of the repair of wear the danger of plastic deformation of the base material in the base of the bore and thus in the supporting region of the profiled bodies is substantially reduced. An undeformed bore ensures a substantially better removal of the remaining profiled bodies- Also as a result considerable savings of costs can be achieved in the repair of wear of the grinding roll.
5 According to the invention the hardness of the pin-shaped profiled bodies is advantageously between 1000 and 1700 HV (Vickers hardness).
The material of the roll body forming the roll surface can advantageously consist of an alloy which is known under the trade name Nihard IV or the alloy designation G-X 300 CrNiSi 952. It contains 2.5 to 3.5% C, 1.5 to 2.2% Si, 0.3 to 0.7% Mn, 8 to 10% Cr, 4.5 to 6.5% Ni and up to 0.5% Mo. A further suitable material with great hardness for the material of the roll body forming the roll surface is chrome chill casting (alloy designations G-X 300 CrMo 153 or G-X 300 CrMoNi 1521) with 2.3 to 3.6% C, 0.2 to 0.8% Si, 0.5 to 1.0% Mn, 14 to 17% Cr, 0.8 to 1.2% Ni and 1.0 to 3.0% or, respectively, 1.8 to 2.2% Mo.
o In the initial state the pin-shaped profiled bodies advantageously have a length of 15 to 50 mm, preferably from to 25 mm, and they project with a length between 3 and mm, preferably between 4 and 8 mm, over the roll surface.
a The invention is illustrated schematically in the drawings, in which: a Figure 1 shows a partial section through a roll body with embedded pin-shaped profiled bodies, Figures 2 and 3 shows schematic representations of a new and a worn grinding roll, Figures 4 and 5 show schematic representations (corresponding to Figures 2 and 3) of a variant.
In the roll body I of the grinding roll of a material bed roll mill there are provided a plurality of recesses (in the form of blind bores) into which pin-shaped profiled bodies 2 are 6 embedded so that they only project with a part of their length over the roll surface. The profiled bodies can for example have a length of 20 to 25 mm and can project approximately mm over the roll surface 3.
In this case the pin-shaped profiled bodies 2 have a cylindrical main part 2a and ends 2b and 2c which are constructed approximately in the shape of truncated cones.
The end 2b can for example have a height of approximately 1 mm and the end 2c can have a height of approximately 2.5 mm.
The hardness of the material of the roll body 1 forming the roll surface 3 is greater than 56 HRc; it preferably lies between 60 and 68 HRc, in particular between 62 and 64 HRc.
The pin-shaped profiled bodies consist of a material which is even harder than the material of the roll body 1 forming the roll surface. The hardness of the profiled bodies 2 is advantageously between 1000 and 1700 HV.
In the embodiment i l lustrated in Figures 2 and 3 the roll surface 3' is occupied approximately over its entire axial length L by pin-shaped profiled bodies 2 in uniform spacing.
After a certain operating time of this roll according to figure 2 the wear pattern according to Figure 3 is produced: Whilst in the two axial edge regions of the roll body there are still pin-shaped profiled bodies 2 present, the central main part of the roll surface is worn by an amount a (of for example 20 to 45 mm, depending upon the original height of the profiled bodies 2).
The repair of the wear takes place in such a way that first of all the pin-shaped profiled bodies remaining in the edge regions are removed. This advantageously takes place by mechanical pulling (after carbonisation of the glue used for fixing) or by burning out of the profiled bodies. A further possibility is to remove the remaining remnants of the profiled bodies by abrasion.
Then the base material, i.e. the material of the roll body forming the roll surface, is brought to a cylindrical shape by machining by turning and/or grinding. In so far as it is necessary, individual points on the roll surface can be further improved at a later stage by build-up welding.
However, in many cases this will not be necessary. Then the recesses to receive new profiled bodies are bored and new pinshaped profiled bodies are inserted and fixed by means of a glue.
In the variant illustrated schematically in Figures 4 and the roll surface 3" in the new state (Figure 4) is only occupied in the central main part Lm of its length by pinshaped profiled bodies 2, whilst the two axial edge regions of the roll surface have no such profiled bodies. The part Lm of the roll length which is occupied by profiled bodies 2 can preferably amount to 70 to 90% of the total length of the rol I.
As a result after a certain operating time the pattern of wear according to Figure 5 is produced: the roll has lost almost all profiled bodies. Consequently no or hardly any profiled bodies have to be removed here before the roll surface is brought back to the cylindrical shape by partial material removal.
8 THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: 1. Grinding roll for a material bed roll mill, with a plurality of pin-shaped profiled bodies which are embedded with a part of their length in recesses in the roll body and with the remaining part of their length project over the roll surface and which consist of a material which is harder than the material of the roll body forming the roll surface, characterised in that the hardness of the material of the roll body forming the roll surface is greater than 56 HRc (Rockwell hardness),preferably between 60 and 68 HRc, particularly between 62 and 64 HRc.
2. Grinding roll as claimed in Claim I, characterised in that the hardness of the pin-shaped profiled bodies is advantageously between 1000 and 1700 HV (Vickers hardness).
3. Grinding roll as claimed in Claim 1, characterised in that the material of the roll body forming the roll surface consists of an alloy which contains 2.5 to 3.5% C, 1.5 to 2.2% Si, 0.3 to 0.7% Mn, 8 to 10% Cr, 4.5 to 6.5% Ni and up to Mo.
2. Grinding roll as claimed in Claim 1, characterised in that the material of the roll body forming the roll surface consists of an alloy which contains 2.3 to 3.6% C, 0.2 to 0.8% Si, 0.5 to 1 Mn, 14 to 17% Cr, 0.8 to 1 Ni and 1.0 to or, respectively, 1.8 to 2.2% Mo.
Grinding roll as claimed in Claim 1, characterised in that the materinitial state the pin-shaped profiled bodies havesurface consists of an alloy which contains 2.5 to 3.5% C, 1.5 to 2.2% Si, 0.
3 to 0.7% Mn, 8 to 10% Cr, 4.5 to 6.5% Ni and up to Mo.
a length of 15 to 50 mm, preferably from 20 to 25 mm, and they project with a length between 3 and 10 mm, preferably between 4 and 8 mm, over the rol I surface.
6. Grinding roll as claimed in Claim 1, characterised in 6. Grinding roll1 as claimed in Claim 1, characterised in

Claims (3)

  1. 7. Grinding roll as claimed in Claim 1, characterised in that the roll surface is occupied by pin-shaped profiled bodies in uniform spacing only in the central main part of its length which is exposed to high wear, whilst the two axial edge regions of the roll surface which are exposed to less wear have no pin-shaped profiled bodies. 0:.0 8. Method for operation during which wear is likely and for subsequent repair of wear of a grinding roll for a .9 material bed roll mill, with a plurality of pin-shaped profiled bodies which are embedded with a part of their length in recesses in the roll body and with the remaining part of their length project over the roll surface and which consist of a material which is harder than the material of the roll body forming the roll surface, wherein the hardness of the material of the roll body forming the roll surface is greater than 56 HRc (Rockwell hardness), preferably between 60 and 68 HRc, particularly between 62 and 64 HRc, characterised in that a) the grinding roll is kept in comminuting operation until a substantial proportion of all profiled bodies, preferably at least 80%, is completely worn and/or has fallen out of the roll body b) and that for repair of the wear the roll surface is then brought back to a cylindrical shape by partial removal of material, new recesses are produced in the roll surface and new profiled bodies are inserted into these recesses.
  2. 9. Method as claimed in Claim 8, characterised in that before the removal of material the remaining profiled bodies still present in the roll body are mechanically removed, preferably by pulling after carbonisation of a glue used for fixing the profiled bodies. Method as claimed in Claim 8, characterised in that the removal of material takes place by machining by turning and/or grinding and any subsequent build-up welding is undertaken only in order to improve individual points on the roll surface.
  3. 11. A grinding roll as herein described with reference to the accompanying drawings. DATED this 14th day of April 1997 KRUPP POLYSIUS AG By their Patent Attorneys CULLEN CO. 11- Abstract The invention relates to a grinding roll with pin-shaped profiled bodies embedded in the roll body, the roll body having a hardness of more than 56 HRc. This grinding roll is used in comminuting operation until a substantial proportion of all profiled bodies is completely worn and/or has fallen out of the roll body. For the repair of wear the roll surface is brought back to a cylindrical shape by partial removal of material, after which new recesses are produced and new profiled bodies are inserted. U. C C C
AU17849/97A 1996-05-06 1997-04-14 Grinding roll and method for operation and repair thereof Ceased AU710348B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19618143 1996-05-06
DE19618143A DE19618143A1 (en) 1996-05-06 1996-05-06 Roller mill grinding roller with projecting anchored pins for longer grinding time

Publications (2)

Publication Number Publication Date
AU1784997A AU1784997A (en) 1997-11-13
AU710348B2 true AU710348B2 (en) 1999-09-16

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AU17849/97A Ceased AU710348B2 (en) 1996-05-06 1997-04-14 Grinding roll and method for operation and repair thereof

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AU (1) AU710348B2 (en)
BR (1) BR9703075A (en)
CA (1) CA2202213A1 (en)
DE (1) DE19618143A1 (en)
ZA (1) ZA973379B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010121304A1 (en) * 2009-04-20 2010-10-28 Hofmann Engineering Pty Ltd Pressure roller
AU2007349090B2 (en) * 2007-03-13 2011-03-31 Flsmidth A/S Method for reconditioning a used grinding roller
AU2008238100B2 (en) * 2007-04-17 2011-10-27 Flsmidth A/S Grinding roller and method for the reconditioning thereof

Families Citing this family (23)

* Cited by examiner, † Cited by third party
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DE19738228A1 (en) * 1997-09-02 1999-03-04 Kloeckner Humboldt Wedag Process for recycling grinding brittle material and grinding plant for this
EP1077087B1 (en) * 1999-08-14 2003-05-28 KHD Humboldt-Wedag AG Milling roller and method for its manufacturing
DE10137131A1 (en) * 2001-07-30 2003-02-13 Polysius Ag Roller for high pressure fluidized bed grinder has surface profiling with wear-resistant profiled bodies whose wear resistance matches stresses on rolling surface to achieve uniform wear over width of roller
DE102006003230A1 (en) * 2006-01-24 2007-07-26 Khd Humboldt Wedag Gmbh Pair of rollers e.g. for high pressure roller presses for milling granular goods under pressure, has two swiveling stored rotatable rollers which move in opposite directions
DE102006010042A1 (en) * 2006-03-04 2007-09-06 Khd Humboldt Wedag Gmbh Hard body for the autogenous wear protection of roll surfaces
DE102006028546A1 (en) * 2006-06-21 2007-12-27 Polysius Ag Process for reprocessing a used grinding roller
DE102008014809A1 (en) * 2008-03-18 2009-09-24 Khd Humboldt Wedag Gmbh Method for all-round renewal of a grinding roller
US8420201B2 (en) 2009-07-09 2013-04-16 Scoperta, Inc. Wear-resistant attachments for high-wear applications
DE102009039928B3 (en) * 2009-08-17 2011-03-03 Khd Humboldt Wedag Gmbh Roll press screen armoring with ring-shaped bolts and method for renewing the reinforcement of this grid armor
DE102010024221A1 (en) 2010-06-18 2011-12-22 Khd Humboldt Wedag Gmbh Profiled bandage for a roller press
JP2012091137A (en) * 2010-10-28 2012-05-17 Mitsubishi Materials Corp Apparatus for fracturing polycrystalline silicon and method for producing fractured fragment of polycrystalline silicon
JP5760384B2 (en) * 2010-10-28 2015-08-12 三菱マテリアル株式会社 Polycrystalline silicon crushing apparatus and method for producing polycrystalline silicon crushed material
DE102010060600B3 (en) * 2010-11-16 2012-03-01 Polysius Ag Method for treating used roll bodies of roller mill, involves introducing socket into extended turned cylindrical or conical bore by shrinking process and turning socket in order to centrally clamp roller body
CN104028945B (en) * 2014-06-19 2016-08-24 马钢(集团)控股有限公司 A kind of Roller of High post tooth broken teeth method for repairing and mending
CN104190497A (en) * 2014-09-17 2014-12-10 南京凯盛国际工程有限公司 Novel hexagonal armor roller surface for roller press
CN104526248B (en) * 2014-11-04 2017-01-25 马鞍山格林环保科技股份有限公司 Column nail roller surface repairing method of high-pressure roller mill
CN105256241B (en) * 2015-11-13 2017-07-11 北方工业大学 A kind of High strength bolt
CN107900606B (en) * 2017-11-08 2019-12-31 中建材(合肥)粉体科技装备有限公司 Wear homogenization method for stud roller surface
CN107866306B (en) * 2017-11-14 2019-06-18 成都利君实业股份有限公司 A kind of stud formula Roller of High and its production method
GB201720212D0 (en) * 2017-12-05 2018-01-17 Element Six Gmbh High pressure grinding roller stud
CN111299958B (en) * 2020-03-30 2024-07-09 安徽马钢设备检修有限公司 Stud embedding device on roller of mine high-pressure roller mill and welding repair process thereof
CN111760636A (en) * 2020-07-03 2020-10-13 浙江申轮水泥机械制造有限公司 Roll sleeve of roll squeezer and manufacturing process thereof
CN114377775B (en) * 2022-01-19 2024-02-09 郑州机械研究所有限公司 Extrusion roller sleeve with high rigidity and high crack resistance

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EP0578239A2 (en) * 1992-07-09 1994-01-12 Klöckner-Humboldt-Deutz Aktiengesellschaft Wear-resistant roller to be used in double roll crushers, in particular high-pressure roller crushers
US5601520A (en) * 1993-07-17 1997-02-11 Klockner-Humboldt-Deutz Ag Wear-resistant hard-surfacing for the rolls of high-pressure roll presses
US5704561A (en) * 1994-09-05 1998-01-06 Deutz Ag Wear-resistant hard-surfacing for the rolls of high-pressure roll presses for size reduction of granular material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0578239A2 (en) * 1992-07-09 1994-01-12 Klöckner-Humboldt-Deutz Aktiengesellschaft Wear-resistant roller to be used in double roll crushers, in particular high-pressure roller crushers
US5601520A (en) * 1993-07-17 1997-02-11 Klockner-Humboldt-Deutz Ag Wear-resistant hard-surfacing for the rolls of high-pressure roll presses
US5704561A (en) * 1994-09-05 1998-01-06 Deutz Ag Wear-resistant hard-surfacing for the rolls of high-pressure roll presses for size reduction of granular material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2007349090B2 (en) * 2007-03-13 2011-03-31 Flsmidth A/S Method for reconditioning a used grinding roller
AU2008238100B2 (en) * 2007-04-17 2011-10-27 Flsmidth A/S Grinding roller and method for the reconditioning thereof
WO2010121304A1 (en) * 2009-04-20 2010-10-28 Hofmann Engineering Pty Ltd Pressure roller

Also Published As

Publication number Publication date
ZA973379B (en) 1997-11-14
AU1784997A (en) 1997-11-13
CA2202213A1 (en) 1997-11-06
BR9703075A (en) 1998-11-10
DE19618143A1 (en) 1997-11-13

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MK14 Patent ceased section 143(a) (annual fees not paid) or expired