EP0776701A1 - Schutzplatte, insbesondere für eine Förderschneckenwendel und Verfahren zu derenHerstellung - Google Patents
Schutzplatte, insbesondere für eine Förderschneckenwendel und Verfahren zu derenHerstellung Download PDFInfo
- Publication number
- EP0776701A1 EP0776701A1 EP96402288A EP96402288A EP0776701A1 EP 0776701 A1 EP0776701 A1 EP 0776701A1 EP 96402288 A EP96402288 A EP 96402288A EP 96402288 A EP96402288 A EP 96402288A EP 0776701 A1 EP0776701 A1 EP 0776701A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tile
- binder
- wear
- sheet
- groove
- 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- Withdrawn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
- 230000001681 protective effect Effects 0.000 title claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000463 material Substances 0.000 claims abstract description 24
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 8
- 239000010935 stainless steel Substances 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 238000000151 deposition Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920000297 Rayon Polymers 0.000 description 2
- 238000005219 brazing Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000002964 rayon Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B1/2008—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with an abrasion-resistant conveyor or drum
Definitions
- the present invention relates to protective tiles, in particular for protecting the thread of a conveyor screw from wear.
- the invention also relates to methods of making such tiles.
- These tiles consist of a body and a wear-resistant part (wear part) arranged along only one of the edges of the body.
- These tiles are generally fixed to the edge of the thread of a conveyor screw, for example of a bowl decanter and screw of the same axis, and come flush with the surface of the interior wall of the bowl.
- the wearing part which, being on the edge of the body of the tile, constitutes the part coming flush with the wall of the bowl, has an external profile as precise and at a sharp angle as possible.
- the body of the tile is generally made of a material identical to that of the screw thread or of a material sufficiently compatible with it so that a mutual weld can be produced which offers sufficient protection from the point of view of corrosion. , for example stainless steel. This material can be machined easily, in particular with conventional machining inserts.
- the wear part is made of a material which is much better resistant to wear, of greater hardness than that of the tile body, for example of tungsten carbide.
- Sintered tungsten carbide is very hard, but also very fragile and the solidity of the wearing part is limited by that of the solder which connects it to the body of the tile. For these reasons a wear part can break in operation and in turn cause chain reaction deterioration of the other wear parts - the carbide pieces being wedged between the screw and the bowl.
- a tile of this kind comprising: a wearing part made of sintered hard material, a weldable support obtained by machining, molding or stamping, a connection of the two components by brazing under an atmosphere and controlled temperature, leads to a high cost price - the assembly of this tile on the thread of the conveyor screw by continuous ground grinding also contributing to increase the total cost.
- a method of manufacturing a tile which consists in depositing and welding a hard part to a ring and in cutting the ring.
- the hard part is not well held by the ring and can come off.
- U.S. 4,003,115 it is not intended to form a groove in a one-piece body, or to remove a portion of the sheet during the manufacture of the tile. It describes a coating on a screw thread of helical shape. The latter cannot be machined like a disc and to obtain a curved shape it is proposed to use side and front walls, in the form of sheet metal sectors which are certainly difficult to curve and to position. Furthermore, it is much more difficult to control the deposition on a spiral than on a disc for reasons of regularity and temperature maintenance.
- the invention overcomes these drawbacks by a method of manufacturing a tile, which is less expensive and simpler than the methods of the prior art and which makes it possible to manufacture tiles which are more resistant to shocks and stresses applied to them. and whose leading edge which comes flush with the wall of the bowl is very sharp and with an exact profile.
- the binder By providing a groove whose side wall immediately has the shape desired for the wear part and by filling it with a liquid whose surface, after cooling, becomes flat, it becomes possible to obtain the wear part final without having to machine hard material, but simply the softer body which surrounds it, the binder ensuring, moreover, a solid and uniform connection of the wearing part to the body, without carrying out operations per se even weakening welding or other.
- This improvement thus makes it possible to manufacture tiles in greater quantity at the same time and, from the same sheet, to manufacture tiles of different radius of curvature as and when rings are cut from the sheet.
- the invention also relates to a two-piece protective tile, consisting of a body and a wearing part made of a composition of a binder and a material of greater hardness than the material of the body and linked to the body, characterized in that the wearing part is in contact with the body by two adjacent connecting faces.
- the free face of the wearing part opposite one of the two adjacent faces, is aligned with a free face of the body.
- the tile preferably has the shape of a disk sector.
- the invention finally relates to a conveyor screw whose edge of the thread comprises a tile according to the invention.
- the material used for the body of the tile is usually stainless steel. It can also be non-stainless steel but weldable.
- the material used for the wear part is generally tungsten carbide. It can also be any other carbides. It can be in the form of particles of 0.1 to 1.6 mm approximately.
- the binder used for tungsten carbide is Ni.
- Other possible binders are based on chromium, silver, zinc, tin, copper etc.
- the binder represents from 20 to 40% of the weight of the composition.
- the temperature to which the mixture is brought must be included, in the case of stainless steel-Ni between 1000 and 1200 ° C.
- a substantially flat stainless steel sheet of circular shape is prepared.
- a circular groove 2 having a side wall 3 of larger diameter. This side wall 3 is flat. It cuts the upper surface of the sheet 1 into a sharp edge 4.
- the groove 2 is filled with a mixture which is carried by a torch C at a temperature between 1000 and 1200 ° C and which consists of tungsten carbide (70% by mass) and nickel (30% by mass), nickel serving as a binder.
- the mixture is made solid by lowering the temperature.
- a wear part 5 is then formed in the groove 2.
- the part of the sheet 1 which is outside the groove 2 is removed by machining by plates (diamond disc) not shown until the wall 3 lateral larger diameter of the wearing part 5 constitutes the outermost part of the tile. It is easy according to this method to obtain that the outer edge of the assembly is perfectly smooth, without any discontinuity existing at the wear part - sheet interface at this outer edge.
- the sheet is cut along the circle 6 so as to obtain a ring which is here circular, but which could be of any other desired shape, this being defined by the shape of the outer lateral wall 3 of the groove and the shape of the cutting line 6.
- FIG. 8 represents a perspective view of a tile according to the invention.
- This tile consists of a body, made of stainless steel which is a material which is compatible or identical with the material of the thread of the conveyor screw, and of a wearing part which is made of a mixture of a material of great hardness. (tungsten carbide) and a binder (nickel) in the mass proportion of 30%.
- Nickel makes it possible to bind the body securely to the wearing part without requiring welding at the body - wearing part interface which would form a weak point of the tile, liable to break under too intense forces.
- the tile in FIG. 8 in the form of a disk sector consists of only two parts, namely the body 10 of the tile and the wear part 5.
- the body 10 has the shape of a step having a lower surface and two upper surfaces offset relative to each other in height and connected to each other by an intermediate vertical face.
- the wearing part 5 is in contact with the body 10 via the intermediate vertical face and the upper face of the lowest level body.
- the interface between the two parts 5 and 10 consists of two faces adjacent to each other, so that the wearing part 5 is supported against the body 10 in two directions of support.
- the outer edge 8 of the tile consisting of a free face of the wearing part 5, opposite one of the adjacent faces, and of the free face of the body 10 which is aligned with this free face, is perfectly smooth , in particular at the interface 7 of the wearing part 5 and of the body 10.
- the interface 14 on the upper face of the tile can also be discontinuous when filling the throat with the mixture to the brim during step 3 of the process. However, depending on the filling level, it is possible to obtain that the wear part protrudes slightly or, on the contrary, is set back relative to the upper surface of the tile.
- FIG. 9 shows a conveyor screw 11, the thread 12 of which is provided at its end edge facing the bowl 13 with protective tiles 15 produced according to the method of the invention. Thanks to this method according to the invention, the leading edge of the protective tiles 15 on the inner wall of the bowl 13 is perfectly sharp and of exact profile, which makes this conveyor screw 11 more reliable during its operation, the particles conveyed being less likely to be trapped between the tile 15 and the wall of the bowl 13.
Landscapes
- Press-Shaping Or Shaping Using Conveyers (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9514223 | 1995-12-01 | ||
| FR9514223A FR2741828B1 (fr) | 1995-12-01 | 1995-12-01 | Tuile de protection, notamment pour filet de vis convoyeuse, et procede de fabrication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0776701A1 true EP0776701A1 (de) | 1997-06-04 |
Family
ID=9485057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP96402288A Withdrawn EP0776701A1 (de) | 1995-12-01 | 1996-10-28 | Schutzplatte, insbesondere für eine Förderschneckenwendel und Verfahren zu derenHerstellung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0776701A1 (de) |
| FR (1) | FR2741828B1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007046193A1 (de) * | 2007-09-26 | 2009-04-02 | Schrage, Otto, Dipl.-Ing. | Platte als Panzerung für eine Schneckenwendel, Schnecke für Dekantierzentrifugen, Dekantierzentrifuge und Verfahren zur Herstellung der Platten |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3764062A (en) | 1972-02-28 | 1973-10-09 | Pennwalt Corp | Centrifuge apparatus |
| US4003115A (en) | 1975-09-25 | 1977-01-18 | Bird Machine Company, Inc. | Method of making centrifuge conveyor |
| GB2102704A (en) | 1981-07-31 | 1983-02-09 | Ingersoll Rand Co | Field replaceable screw conveyor inserts |
| DE4408717A1 (de) * | 1994-03-15 | 1995-09-21 | Metallgesellschaft Ag | Schichtverbundelemente für den Verschleißschutz |
-
1995
- 1995-12-01 FR FR9514223A patent/FR2741828B1/fr not_active Expired - Fee Related
-
1996
- 1996-10-28 EP EP96402288A patent/EP0776701A1/de not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3764062A (en) | 1972-02-28 | 1973-10-09 | Pennwalt Corp | Centrifuge apparatus |
| US4003115A (en) | 1975-09-25 | 1977-01-18 | Bird Machine Company, Inc. | Method of making centrifuge conveyor |
| GB2102704A (en) | 1981-07-31 | 1983-02-09 | Ingersoll Rand Co | Field replaceable screw conveyor inserts |
| DE4408717A1 (de) * | 1994-03-15 | 1995-09-21 | Metallgesellschaft Ag | Schichtverbundelemente für den Verschleißschutz |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007046193A1 (de) * | 2007-09-26 | 2009-04-02 | Schrage, Otto, Dipl.-Ing. | Platte als Panzerung für eine Schneckenwendel, Schnecke für Dekantierzentrifugen, Dekantierzentrifuge und Verfahren zur Herstellung der Platten |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2741828A1 (fr) | 1997-06-06 |
| FR2741828B1 (fr) | 1998-01-23 |
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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): DE ES FR GB |
|
| 17P | Request for examination filed |
Effective date: 19970925 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
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| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
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| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
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| 17Q | First examination report despatched |
Effective date: 19990824 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
| 18W | Application withdrawn |
Withdrawal date: 19991013 |