WO2002038339A1 - Procede de realisation d'un outil abrasif - Google Patents
Procede de realisation d'un outil abrasif Download PDFInfo
- Publication number
- WO2002038339A1 WO2002038339A1 PCT/BE2000/000137 BE0000137W WO0238339A1 WO 2002038339 A1 WO2002038339 A1 WO 2002038339A1 BE 0000137 W BE0000137 W BE 0000137W WO 0238339 A1 WO0238339 A1 WO 0238339A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- support
- cavity
- filling
- alloy
- granules
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
- B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
- B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
- B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
- B24D3/06—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements
- B24D3/08—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic metallic or mixture of metals with ceramic materials, e.g. hard metals, "cermets", cements for close-grained structure, e.g. using metal with low melting point
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
- B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
- B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
Definitions
- the present invention relates to a method of manufacturing a tool comprising at least one machining insert made of one or more materials, in particular based on diamond, and a support for the insert (s).
- One known technique consists in manufacturing abrasive segments or plates by sintering and brazing or welding them on a support, such as a disc to form a sawing disc. Brazing or soldering is time consuming.
- Another known technique consists in placing in a matrix a sheet, as a support, and volumes of powder suitable for forming platelets, in closing the matrix by a complementary matrix and in subjecting this assembly to sintering temperature and pressure to obtain a metallurgical junction between the different constituents, with diffusion between powder and sheet.
- the above sintering is a delicate operation because the diamond only supports at most about 900 ° C, a temperature insufficient for sintering the metals of the powder. This too low temperature must be compensated by a high pressure which is often difficult and costly to implement.
- the object of the present invention is to avoid the drawbacks mentioned above and to provide a process which makes it possible to manufacture the tools concerned, in a simple, rapid and economical manner, using at least partially said support as a mold for the shaping of the wafer (s) and eliminating the pressurization of the constituent elements of the latter, in order to avoid uncontrollable variations in their dimensions and in particular their thickness relative to that of the support.
- said method comprises, for the or each wafer, (a) shaping a cavity in the support, according to the shape desired for the wafer, (b) laying the support so as to that the cavity has an opening upwards, (c) filling the cavity with the constituent material or materials of said wafer, (d) adding a mass of a metallic alloy for bonding to the material or materials filling components, the alloy being chosen to have a melting temperature lower than that of the support and of the constituent material (s), (e) an increase in the temperature of the assembly thus formed by the support, said constituent materials and the aforementioned mass, until the fusion of the bonding alloy, so as to allow the alloy to melt and naturally infiltrate so that it fills all the gaps between the constituent material (s) and between that (s) - this and the walls of the cavity, and (f) cooling of the infiltrated assembly.
- Figure 1 shows in plan a disc in which are cut, on one half, distant cavities on the lateral side and, on the other half, cavities open towards this lateral side, and in which are formed plates.
- Figure 2 shows, in section and in elevation, the disc of Figure 1 placed on a tray (but shown at a distance for clarity of the drawing), the cavities filled before infiltration.
- Figure 3 shows an enlargement, with breakage, of part of Figure 2, a mass placed on the granules and grains arranged in the cavities.
- FIG. 4 shows the application of the invention when the support is a coring tube.
- Figures 5 and 6 respectively show embodiments, according to the method of the invention, of a notched disc (with partial representation) and a straight blade (with breakage).
- the method of the invention comprises (FIG. 1) for each wafer 1, shaping a cavity 2 in the support 3, according to the shape desired for the wafer 1.
- the support 3 is then placed (FIG. 2) so as to that the cavity 2 has an opening 4 upwards.
- the cavity 2 is filled with the constituent material (s) 6 of the wafer 1.
- a mass 7 (FIG. 3) of a metallic bonding alloy can be placed on the filling constituent material (s) 6 or even be at least partially mixed with that (these) with, if necessary, a surplus placed on or under them to compensate for a settlement of this mass 7 by fusion.
- the alloy is chosen to have a melting temperature lower than that of the support 3 and of the constituent material (s) 6. It is, for example, a known brazing alloy, such as copper and silver. Said mass 7 may consist of wires, blocks, powder, etc. On the left side of FIG. 2, the cavity 2 has a bottom.
- the temperature of the assembly thus formed is increased until the fusion of the bonding alloy 7 is obtained, so as to allow it to melt and to infiltrate naturally so that it fills all the interstices between the constituent material (s) 6 and between that (s) -ci and the wall of the cavity 2. Finally, this infiltrated assembly is cooled.
- the constituent material (s) 6 which may be in the form of granules, preferably substantially spherical, can be shaped beforehand, directly in the support 3, so that, for example, the thickness of the resulting wafer 1 is at least flush with the thickness of the support 3, or overflows with a chosen value.
- the aforementioned granules may consist, for at least one part, of coated diamond grains and, for the remaining part, of filling granules such as, for example, granules of cast iron intended for shot blasting, coarse carbide, grains of quartz or alumina, etc.
- filling granules such as, for example, granules of cast iron intended for shot blasting, coarse carbide, grains of quartz or alumina, etc.
- Several fine grains of diamond can be coated to form a diamond grain each time; a diamond grain may contain only a large grain of coated diamond.
- a choice of a specific weight of the same order of magnitude for the coated diamond grains, by choosing for this purpose the material of the coating, and for the filling granules, by choosing their material, will easily ensure a good distribution of the among the others.
- Said coating is formed for example from metallic powders and organized to give a solid and easy to handle grain. It may be advantageous if the coated diamond grains and / or the filling granules have pores capable of being filled with metal alloy 7 at the same time as the aforementioned interstices: this can significantly increase the cohesion of the assembly produced.
- the granules like possibly the diamond grains, preferably have a substantially equal dimension, between 300 and 2000 micrometers, or even between 500 and 1500 micrometers. These dimensions are clearly greater than those of the powders usually used in the art.
- the shaping of the cavity 2 may include a digging right through the thickness of the support 3 as shown on the right side of Figure 2. The support 3 is then placed ( Figure 2 or 3) on a plate 9, in particular in graphite or ceramic, arranged to close the opening 11, facing downwards, of the cavity 2.
- the shaping of the cavity 2 may include a hollowing of the latter so that it leads to a side 12 oriented laterally of the support 3 when the latter is placed so as to present the filling opening 4 upwards. In this case, this lateral side 12 is closed at the point where the cavity 2 opens into it, in particular using a graphite or ceramic element.
- the shaping of the cavity 2 is carried out so that a wall 13 (FIGS. 1 and 3) thereof extends along the side 12 oriented laterally of the support 3, when the latter is placed in order to present the filling opening upwards 4. Then, after the above-mentioned cooling step, it is possible to provide machining of said side 12 so as to remove the material from the support 3 there until reduce the thickness so that it is between 0.1 and 3 millimeters or expose it on this lateral side 12 the material of the wafer 1 in order to make it active on this side.
- the technique of the invention is of course also applicable (FIG. 6) to straight blades 20 for reciprocating sawing. comes, the segments 1 manufactured according to the invention can be aligned flush with the lateral side 12 of sawing. Holes 21 are used for fixing the blade 20 in a frame known per se.
- FIG. 5 shows a disc on which the segments 1 are arranged at a distance from the lateral side 12 and can extend through the thickness of the support 3 to be active on the two faces of the latter.
- a segment 1 out of two could be active on one side and each second segment 1 active on the other side.
- the disc shown comprises a kind of known notches 23, arranged between each segment 1. Other kinds or arrangements of notches 23, even in other places of the disc, are applicable.
- the support 3 has (FIG. 4) a tubular shape 14, like a tool for coring in concrete, and the cavities 2 are shaped so as to open at one end 16 of this tubular shape 14, this end 16 is turned upwards, it is surrounded by a mold 17 on its outer face and / or provided with a core 18 for its inner face, in order to delimit said cavity 2 to be filled.
- Graphite can be chosen as the material for the mold 17 and / or the core 18.
- the material for coating the diamond grains like that of the filling granules, that of the infiltration alloy 7 and that of the support 3 are advantageously chosen from materials which exhibit zero or insensible shrinkage during cooling.
- the method of the invention ensures dimensional stability during and after manufacture, it is possible to choose and obtain a projection dimension of the plate (s) 1 relative to the support 3 of the order of 50 to 2000 micrometers and preferably from 50 to 250 micrometers.
- the material of the support 3 will be chosen from those for which the degree of wear is substantially of the same order of magnitude as that of the insert (s) 1, since the support 3 can come into contact with the object to be machined. and must be eliminated at the same time as the pad (s) 1 wear out. Uncured steel can be used for this purpose for support 3.
- the invention therefore allows costly manufacture of the tools concerned since it simplifies and practically eliminates in many cases the manufacture and use of expensive molds and / or dies and / or tools for shaping and sintering under pressure.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BE2000/000137 WO2002038339A1 (fr) | 2000-11-10 | 2000-11-10 | Procede de realisation d'un outil abrasif |
AU2001212602A AU2001212602A1 (en) | 2000-11-10 | 2000-11-10 | Method for producing an abrasive tool |
EP00974195A EP1332021A1 (fr) | 2000-11-10 | 2000-11-10 | Procede de realisation d'un outil abrasif |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BE2000/000137 WO2002038339A1 (fr) | 2000-11-10 | 2000-11-10 | Procede de realisation d'un outil abrasif |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002038339A1 true WO2002038339A1 (fr) | 2002-05-16 |
Family
ID=3862556
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BE2000/000137 WO2002038339A1 (fr) | 2000-11-10 | 2000-11-10 | Procede de realisation d'un outil abrasif |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1332021A1 (fr) |
AU (1) | AU2001212602A1 (fr) |
WO (1) | WO2002038339A1 (fr) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3343308A (en) * | 1965-12-30 | 1967-09-26 | Fessel Paul | Cutting and grinding devices |
US4861350A (en) * | 1985-08-22 | 1989-08-29 | Cornelius Phaal | Tool component |
EP0365843A1 (fr) * | 1988-10-25 | 1990-05-02 | General Electric Company | Segment de lame de scie avec sable polycristallin de diamant |
US5030276A (en) * | 1986-10-20 | 1991-07-09 | Norton Company | Low pressure bonding of PCD bodies and method |
US6039641A (en) * | 1997-04-04 | 2000-03-21 | Sung; Chien-Min | Brazed diamond tools by infiltration |
-
2000
- 2000-11-10 WO PCT/BE2000/000137 patent/WO2002038339A1/fr not_active Application Discontinuation
- 2000-11-10 EP EP00974195A patent/EP1332021A1/fr not_active Withdrawn
- 2000-11-10 AU AU2001212602A patent/AU2001212602A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3343308A (en) * | 1965-12-30 | 1967-09-26 | Fessel Paul | Cutting and grinding devices |
US4861350A (en) * | 1985-08-22 | 1989-08-29 | Cornelius Phaal | Tool component |
US5030276A (en) * | 1986-10-20 | 1991-07-09 | Norton Company | Low pressure bonding of PCD bodies and method |
EP0365843A1 (fr) * | 1988-10-25 | 1990-05-02 | General Electric Company | Segment de lame de scie avec sable polycristallin de diamant |
US6039641A (en) * | 1997-04-04 | 2000-03-21 | Sung; Chien-Min | Brazed diamond tools by infiltration |
Also Published As
Publication number | Publication date |
---|---|
EP1332021A1 (fr) | 2003-08-06 |
AU2001212602A1 (en) | 2002-05-21 |
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