EP0788415A1 - Procede de fabrication d'un galet de broyage bimetallique - Google Patents
Procede de fabrication d'un galet de broyage bimetalliqueInfo
- Publication number
- EP0788415A1 EP0788415A1 EP95933415A EP95933415A EP0788415A1 EP 0788415 A1 EP0788415 A1 EP 0788415A1 EP 95933415 A EP95933415 A EP 95933415A EP 95933415 A EP95933415 A EP 95933415A EP 0788415 A1 EP0788415 A1 EP 0788415A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- inserts
- shell
- temperature
- wear
- iron
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/08—Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
- B02C15/004—Shape or construction of rollers or balls
- B02C15/005—Rollers or balls of composite construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D13/00—Centrifugal casting; Casting by using centrifugal force
- B22D13/04—Centrifugal casting; Casting by using centrifugal force of shallow solid or hollow bodies, e.g. wheels or rings, in moulds rotating around their axis of symmetry
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/06—Casting in, on, or around objects which form part of the product for manufacturing or repairing tools
Definitions
- the present invention relates to a process for manufacturing a bimetallic grinding roller of generally frustoconical or cylindrical shape, comprising a support cast in ductile cast iron machinable in the external surface of which are embedded, longitudinally, in the direction of the generator , wear inserts made of a material with high wear resistance, said inserts being retained in the support by a mechanical connection.
- the invention also relates to a grinding roller obtained by the implementation of this process. Grinding rollers are known which consist of an outer wear layer which is supported by a more ductile core. These rollers are produced by successive pouring of the wear layer and of the support core to form a metallurgical bond between the two materials.
- the document EP 0 476 496 A1 recommends the technique of inserts for the manufacture of grinding rollers by the implementation of a process as described in the preamble.
- the inserts are poured separately in first molds and then placed in a sand mold in which the support core is poured to form a mechanical connection between the two materials.
- the mechanical bond does not imply constraints from the point of view of the choice of materials, so that it is possible to choose harder alloys for the inserts, for example highly alloyed chrome cast iron or all other highly wear-resistant material and more suitable alloys for the core, such as spheroidal graphite cast iron.
- This technique also allows a doubling of the casting capacity, since the inserts are cast separately and can be stored for the second casting.
- the object of the present invention is to provide a new method for manufacturing bimetallic grinding rollers which makes it possible to eliminate or at least reduce the drawbacks associated with the known method, while safeguarding their advantages.
- the invention provides a process of the kind described in the preamble which is characterized in that a mold is used which consists of a transportable shell made of metal or any other material resistant to a temperature of at least minus 400 ° C, in that the inserts are erected on the periphery of the shell, in that the shell and the inserts are preheated in an oven, in that the shell is quickly unheated with the inserts to place it on a centrifugal casting machine which is rotated, in that the ductile iron is poured and in that it is removed from the mold after cooling.
- Ductile iron is preferably gray lamellar or nodular iron, while the inserts are preferably chrome iron or a material that is very resistant to wear.
- the inserts into the shell Before inserting the inserts into the shell, the latter is provided with a thin refractory coating.
- the oven can be preheated to a temperature of the order of 100 to 500 ⁇ C.
- the centrifugal casting machine is rotated at a speed of the order of 100 to 600 revolutions per minute.
- the release of the roller can be carried out when the temperature has dropped to a value of the order of 500 ⁇ C.
- centrifugal casting brings a natural complementarity effect which is beneficial to the technology of the inserts.
- the centrifugal force generated by the rotation of the shell ensures self-locking of the inserts against the wall of the shell and thus contributes to a better fixing of the inserts and to a reduction in the risks of displacement during casting.
- the cast iron completely fills the spaces between the inserts to ensure a perfect crimping thereof, without the risk of alveoli formation due to the solidification of the cast iron before filling. of all the interstices.
- the mold shown in the figure is in the form of a transportable shell 10 whose volume corresponds to a grinding roller, in this case a truncated cone of revolution.
- the shell 10 has a closure cover 12 with a central tap hole 14.
- the first step consists in coating the interior of the shell with a thin refractory layer to protect the shell and facilitate demolding.
- inserts 16, previously cast in another mold, not shown, are arranged in the shell.
- These inserts 16 can be made of any wear-resistant material (eg carbides, ceramics, etc.) or of cast iron chrome, of the kind described in document EP 0 476 496 in which case they can be wedged against each other and wedged by arching effect.
- the shell 10 with the inserts 16 is then placed in an oven preheated to a temperature of 100 to 500 ° C. depending on the nature of the materials used in order to heat the inserts to a temperature sufficient to avoid thermal shocks.
- the shell 10 When the inserts are at the desired temperature, the shell 10 is rapidly unloaded and placed on the rotary plate of a centrifugal casting machine known per se. This machine is driven at a speed which can vary between 100 and 600 revolutions per minute to rotate the shell with the inserts around its vertical axis (arrow A).
- the carrier material of the roller is poured through the tap hole 14, for example gray lamellar or nodular cast iron. Under the effect of centrifugal force, the cast iron spreads out in the form of a frustoconical sheet on the inserts 16 and fills all the interstices between them.
- the mold After this casting, it is allowed to cool and the mold is removed from the mold at a temperature of the order of 500 ⁇ C.
- the roller thus produced has an axial frustoconical bore allowing it to be fixed by shrinking onto a support hub after machining finishing.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Manufacturing & Machinery (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Crushing And Grinding (AREA)
- Earth Drilling (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Heat Treatment Of Articles (AREA)
- Forging (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU88549 | 1994-10-24 | ||
LU88549A LU88549A1 (fr) | 1994-10-24 | 1994-10-24 | Procédé de fabrication d'un galet de broyage bimétallique et galet de broyage obtenu par la mise en oeuvre de ce procédé |
PCT/EP1995/003744 WO1996012581A1 (fr) | 1994-10-24 | 1995-09-22 | Procede de fabrication d'un galet de broyage bimetallique et galet de broyage obtenu par la mise en oeuvre de ce procede |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0788415A1 true EP0788415A1 (fr) | 1997-08-13 |
EP0788415B1 EP0788415B1 (fr) | 1998-06-24 |
Family
ID=19731499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95933415A Expired - Lifetime EP0788415B1 (fr) | 1994-10-24 | 1995-09-22 | Procede de fabrication d'un galet de broyage bimetallique |
Country Status (10)
Country | Link |
---|---|
US (1) | US5819838A (fr) |
EP (1) | EP0788415B1 (fr) |
JP (1) | JP3398752B2 (fr) |
KR (1) | KR100388509B1 (fr) |
CN (1) | CN1068808C (fr) |
CA (1) | CA2201307A1 (fr) |
DE (1) | DE69503145T2 (fr) |
LU (1) | LU88549A1 (fr) |
WO (1) | WO1996012581A1 (fr) |
ZA (1) | ZA959005B (fr) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LU90006B1 (fr) * | 1997-01-15 | 1997-08-21 | Magotteaux Int | Insert pour pièces d'usure composites procédé de fabrication d'une pièce d'usure à l'aide de tels inserts et pièce d'usure ainsi réalisée |
GB2348838B (en) * | 1999-04-07 | 2002-09-11 | Sweetmore Engineering Holdings | Method of spin coating |
JP2009183877A (ja) * | 2008-02-06 | 2009-08-20 | Ube Techno Enji Kk | 竪型粉砕機の粉砕ローラ |
CN101941064A (zh) * | 2010-08-25 | 2011-01-12 | 刘明强 | 离心法制造金属基复合双金属制品的方法 |
US9192987B2 (en) * | 2013-04-05 | 2015-11-24 | Caterpillar Inc. | Method of casting |
CN103920864A (zh) * | 2014-04-25 | 2014-07-16 | 安岳县金龙机械制造有限公司 | 一种复合铸造磨辊加工装置及其加工工艺 |
CN104959564A (zh) * | 2014-11-28 | 2015-10-07 | 东莞市晋益电子科技有限公司 | 一种双金属无缝隙嵌铸工件的生产方法 |
IT201800003964A1 (it) * | 2018-03-26 | 2019-09-26 | Valme S R L Unico Socio | Elemento tubolare per il trasferimento di materiali abrasivi, in particolare calcestruzzo, e procedimento per realizzarlo |
IT201800004795A1 (it) | 2018-04-23 | 2019-10-23 | Elemento tubolare per il trasferimento di materiali abrasivi, in particolare calcestruzzo, e procedimento per realizzarlo | |
CN108356244B (zh) * | 2018-05-02 | 2019-12-27 | 湖南四昉新材料有限公司 | 一种双金属轧辊外套的浇铸装置 |
CN110479979A (zh) * | 2019-08-06 | 2019-11-22 | 山东天物成型科技有限公司 | 双金属复合滚刀刀圈的生产方法 |
CN110465638A (zh) * | 2019-08-06 | 2019-11-19 | 山东天物成型科技有限公司 | 双金属复合滚刀刀圈生产工艺及其生产用电渣离心装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2155215A (en) * | 1936-02-27 | 1939-04-18 | Beament Thomas Geoffrey | Method of producing composite wear-resisting bodies |
JPS59202153A (ja) * | 1983-05-02 | 1984-11-15 | Mitsubishi Heavy Ind Ltd | 鋳かけ肉盛りロ−ルの製造方法 |
JPS63143949A (ja) * | 1986-12-09 | 1988-06-16 | アイエヌジ商事株式会社 | 粉砕機に使用される破砕面部材 |
GB8809795D0 (en) * | 1988-04-26 | 1988-06-02 | Vickers Plc | Application of bearing alloys to bushes |
BE1004573A4 (fr) * | 1990-09-20 | 1992-12-15 | Magotteaux Int | Procede de fabrication d'une piece de fonderie bimetallique et piece d'usure realisee par ce procede. |
DE4112000A1 (de) * | 1991-03-23 | 1992-09-24 | Karl Lange | Verfahren zur herstellung von verschleissgeschuetzten gussstuecken |
-
1994
- 1994-10-24 LU LU88549A patent/LU88549A1/fr unknown
-
1995
- 1995-09-22 US US08/817,853 patent/US5819838A/en not_active Expired - Lifetime
- 1995-09-22 CA CA002201307A patent/CA2201307A1/fr not_active Abandoned
- 1995-09-22 JP JP51361096A patent/JP3398752B2/ja not_active Expired - Fee Related
- 1995-09-22 EP EP95933415A patent/EP0788415B1/fr not_active Expired - Lifetime
- 1995-09-22 KR KR1019970702625A patent/KR100388509B1/ko not_active IP Right Cessation
- 1995-09-22 CN CN95195825A patent/CN1068808C/zh not_active Expired - Lifetime
- 1995-09-22 WO PCT/EP1995/003744 patent/WO1996012581A1/fr not_active Application Discontinuation
- 1995-09-22 DE DE69503145T patent/DE69503145T2/de not_active Expired - Lifetime
- 1995-10-24 ZA ZA959005A patent/ZA959005B/xx unknown
Non-Patent Citations (1)
Title |
---|
See references of WO9612581A1 * |
Also Published As
Publication number | Publication date |
---|---|
JPH10507969A (ja) | 1998-08-04 |
LU88549A1 (fr) | 1995-02-01 |
US5819838A (en) | 1998-10-13 |
WO1996012581A1 (fr) | 1996-05-02 |
CA2201307A1 (fr) | 1996-05-02 |
KR100388509B1 (ko) | 2003-10-22 |
AU3609095A (en) | 1996-05-15 |
DE69503145T2 (de) | 1998-11-05 |
KR970706930A (ko) | 1997-12-01 |
AU691342B2 (en) | 1998-05-14 |
ZA959005B (en) | 1996-05-22 |
JP3398752B2 (ja) | 2003-04-21 |
CN1068808C (zh) | 2001-07-25 |
DE69503145D1 (de) | 1998-07-30 |
EP0788415B1 (fr) | 1998-06-24 |
CN1161663A (zh) | 1997-10-08 |
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