EP1207011A2 - Abrasive chips for surface treatments in rotary and vibratory apparatus - Google Patents
Abrasive chips for surface treatments in rotary and vibratory apparatus Download PDFInfo
- Publication number
- EP1207011A2 EP1207011A2 EP01126093A EP01126093A EP1207011A2 EP 1207011 A2 EP1207011 A2 EP 1207011A2 EP 01126093 A EP01126093 A EP 01126093A EP 01126093 A EP01126093 A EP 01126093A EP 1207011 A2 EP1207011 A2 EP 1207011A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- abrasive
- grains
- chip according
- chips
- thermoplastic resin
- 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
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
- B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
- B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls
Definitions
- the present invention relates to abrasive chips for surface treatments in rotary and vibratory apparatus.
- the invention concerns abrasive particles or chips used in vibratory finishing apparatus or in rotary tumbling barrels for deburring, burnishing, edge chamfering and smoothing parts or pieces being worked.
- the abrasives used at present for surface finishing in rotary barrels and in vibratory apparatus are chips, of different shapes and sizes, comprising a binder and abrasive material.
- thermosetting resin poly(ethylene and urea-formaldehyde resins). Ceramic binder chips are used for deburring and for treating hard materials; thermosetting resin chips are used on softer materials and for finishing.
- a further object of the invention is to allow using regenerated plastic materials and abrasive products for producing the abrasive chips.
- the abrasive chips made in accordance with the invention may be employed in the vibratory apparatus and the rotary barrels conventionally used for such kind of working.
- An abrasive chip made in accordance with the present invention comprises a binder made of a high-resistance thermoplastic polymer, belonging to the category of the "building materials” or “technopolymers” (e. g. highly crystalline PET), and high-performance abrasive grains or particles (e. g. corundum and silicon carbide).
- a binder made of a high-resistance thermoplastic polymer belonging to the category of the "building materials” or “technopolymers” (e. g. highly crystalline PET), and high-performance abrasive grains or particles (e. g. corundum and silicon carbide).
- a typical formulation is a mixture containing 25% PET and 75% corundum.
- a composition with lower abrasive percentages e.g. down to 20% and sometimes even less
- less aggressive abrasive grains e.g. quartz, alumina, zircon, etc.
- the main feature of an abrasive chip made in accordance with the present invention is the binder plasticity, which is maintained even with high percentages of abrasive load, together with the very high abrasion resistance and the tenacity of the technopolymer.
- thermoplastic resin or technopolymer
- PET polyethylene terephtalate
- PBT polybutylene terephtalate
- carbonate possibly modified with elastomers
- the shapes and sizes of the abrasive chips may be very different, and they correspond to the shapes and sizes of the conventional abrasive chips.
- the chips may be of spherical, cylindrical or parallelepiped shape, or of any other shape that better suits to the pieces to be worked.
- the abrasive chips made in accordance with the present invention are obtained by screw extrusion, directly into the desired shape, or by pelletisation and subsequent new extrusion or injection moulding.
- the percentage of the abrasive particles in the binding material is very high (indeed, it can be up to 75 - 80%), use of a double-screw extruder is advisable for extrusion.
- the physical and mechanical properties of the abrasive chips made in accordance with the present invention provide essential improvements in the technology of use of the abrasives, more particularly:
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
Description
- The present invention relates to abrasive chips for surface treatments in rotary and vibratory apparatus.
- More particularly, the invention concerns abrasive particles or chips used in vibratory finishing apparatus or in rotary tumbling barrels for deburring, burnishing, edge chamfering and smoothing parts or pieces being worked.
- The abrasives used at present for surface finishing in rotary barrels and in vibratory apparatus are chips, of different shapes and sizes, comprising a binder and abrasive material.
- Two different kinds of such chips are at present manufactured: with a ceramic binder or with a thermosetting resin (polyester and urea-formaldehyde resins). Ceramic binder chips are used for deburring and for treating hard materials; thermosetting resin chips are used on softer materials and for finishing.
- With both kinds of chips, working times are very long and a same abrasive cannot be used for both rough machining and finishing. Moreover, due to their stiffness, such chips do not allow using high intensity vibrations and working great amounts of material relative to the amount of the abrasive load included.
- It is an object of the invention to provide abrasive chips for use in vibratory apparatus and in rotary barrels for surface finishing, with improved efficiency and shorter working cycles than possible at present.
- A further object of the invention is to allow using regenerated plastic materials and abrasive products for producing the abrasive chips.
- The above and other objects are achieved by means of an abrasive chip made in accordance with the present invention, as claimed in the appended claims.
- The abrasive chips made in accordance with the invention may be employed in the vibratory apparatus and the rotary barrels conventionally used for such kind of working.
- The above and other objects of the invention will become more apparent from the following description of a preferred embodiment.
- An abrasive chip made in accordance with the present invention comprises a binder made of a high-resistance thermoplastic polymer, belonging to the category of the "building materials" or "technopolymers" (e. g. highly crystalline PET), and high-performance abrasive grains or particles (e. g. corundum and silicon carbide).
- A typical formulation is a mixture containing 25% PET and 75% corundum.
- For particular aims (e.g. lapping of soft metals) use of a composition with lower abrasive percentages (e. g. down to 20% and sometimes even less) and less aggressive abrasive grains (e.g. quartz, alumina, zircon, etc.) is convenient.
- The main feature of an abrasive chip made in accordance with the present invention is the binder plasticity, which is maintained even with high percentages of abrasive load, together with the very high abrasion resistance and the tenacity of the technopolymer.
- The thermoplastic resin, or technopolymer, can be for instance polyethylene terephtalate (PET), or polybutylene terephtalate (PBT) or polycarbonate, possibly modified with elastomers.
- The shapes and sizes of the abrasive chips may be very different, and they correspond to the shapes and sizes of the conventional abrasive chips. For instance, the chips may be of spherical, cylindrical or parallelepiped shape, or of any other shape that better suits to the pieces to be worked.
- The abrasive chips made in accordance with the present invention are obtained by screw extrusion, directly into the desired shape, or by pelletisation and subsequent new extrusion or injection moulding.
- If the percentage of the abrasive particles in the binding material is very high (indeed, it can be up to 75 - 80%), use of a double-screw extruder is advisable for extrusion.
- The physical and mechanical properties of the abrasive chips made in accordance with the present invention provide essential improvements in the technology of use of the abrasives, more particularly:
- possibility of using vibration intensities significantly higher than with conventional abrasive chips, so that a great reduction in the working cycle duration is attained. Actually, the abrasive chips including thermoplastic resins do not cause dents on the workpieces, even with high vibration intensities, and they strongly attenuate the effects of shocks between the workpieces; consequently, the ratio "workpiece weight - to - abrasive chip weight" can be increased, with a consequent increase in efficiency;
- extremely reduced water amount needed during wet cycles in the removal phase (less than 1/1000 the abrasive chip weight per minute);
- very low abrasive consumption, even for strong removals;
- possibility of using peculiar and very advantageous technologies,
such as:
- a) feeding, during working, small amounts of abrasive powder. This causes a great increase in the removal capacity even with very low feed of abrasive powder (typically, 1/1000 the abrasive chip weight per hour). Hence, working times correspondingly decrease;
- b) high water feed (typically, 30% the abrasive chip weight per hour). This causes passing from a strong abrasive action to a buffing action, with quick attainment of lapped surfaces. During such step, abrasive removal and consumption are substantially zero, so that water can be directly recycled;
- c) very interesting is the possibility of automatically passing from a phase of strong removal to a polishing and finishing phase, by simply stopping abrasive powder feed and increasing water feed, without any change in the working parameters. At the end of the polishing cycle, after loading new workpieces, restoring the starting conditions is sufficient to go back to a strong removal;
- no introduction of substances requiring chemical purification into waste water, minimum foam production and possibility of total water recycling through a simple decantation or filtering; total absence of any toxic or dangerous product in the mud generated by the abrasive;
- possibility of producing the abrasive chips by using recycled materials only (typical formulation: PET obtained by grinding used plastic bottles and abrasive obtained from ground and sieved scrap of exhausted grinding wheels). This allows considerable savings in production costs and enables an economically advantageous recovery of largely diffused wastes, such as used PET bottles and exhausted abrasive grinding wheels.
- Lastly, the particular working technology enabled by such abrasive chips allows a wide tolerance in abrasive load granulometry.
Claims (14)
- Abrasive chip suitable for use as abrasive medium in a vibratory or rotary apparatus for finishing parts or pieces being worked, the chip comprising abrasive grains dispersed in a binding material and being characterised in that said binding material is a thermoplastic resin.
- Abrasive chip according to claim 1, wherein said thermoplastic resin is a thermoplastic polymer.
- Abrasive chip according to claim 2, wherein said thermoplastic polymer is polyethylene terephtalate.
- Abrasive chip according to claim 2, wherein said thermoplastic polymer is polybutylene terephtalate.
- Abrasive chip according to claim 2, wherein said thermoplastic polymer is polycarbonate.
- Abrasive chip according to any preceding claim, wherein said abrasive grains are corundum grains.
- Abrasive chip according to any of claims 1 to 5, wherein said abrasive grains are silicon carbide grains.
- Abrasive chip according to any of claims 1 to 5, wherein said abrasive grains are zircon grains.
- Abrasive chip according to any of claims 1 to 5, wherein said abrasive grains are quartz grains.
- Abrasive chap according to any of claims 1 to 5, wherein said abrasive grains are alumina grains.
- Abrasive chip according to any of claims 1 to 5, wherein said abrasive grains comprise a mixture of two or more materials chosen out of corundum, silicon carbide, zircon, quartz and alumina.
- Abrasive chip according to any of claims 1 to 5, wherein said thermoplastic resin is obtained through a regeneration process of recycled plastic materials.
- Abrasive chip according to any of claims 6 to 11, wherein said abrasive grains are obtained through a grinding process of recycled abrasive materials.
- Abrasive chip according to any preceding claim, containing, in weight, about 25% binding material and about 75% abrasive grains.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO001045 | 2000-11-07 | ||
IT2000TO001045A IT1320833B1 (en) | 2000-11-07 | 2000-11-07 | ABRASIVE ELEMENTS FOR SURFACE TREATMENTS IN EROTANT VIBRATING MACHINES. |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1207011A2 true EP1207011A2 (en) | 2002-05-22 |
EP1207011A3 EP1207011A3 (en) | 2002-09-04 |
EP1207011B1 EP1207011B1 (en) | 2005-01-19 |
Family
ID=11458193
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01126093A Expired - Lifetime EP1207011B1 (en) | 2000-11-07 | 2001-11-02 | Abrasive chips for surface treatments in rotary and vibratory apparatus |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1207011B1 (en) |
AT (1) | ATE287318T1 (en) |
DE (1) | DE60108464T2 (en) |
IT (1) | IT1320833B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2881069A1 (en) * | 2005-01-27 | 2006-07-28 | Pierre Laujon | Metallic instrument e.g. surgical instrument, cleaning machine for e.g. hospital, has moving belt supporting loads of sand-milling tools and burnishing tools such as balls, where sand-milling tools are presented as deformable blocks |
WO2007098856A1 (en) * | 2006-03-02 | 2007-09-07 | International Chips S.R.L. | Highly efficient abrasive preformed body for vibratory finishing of metallic and nonmetallic parts |
US8349041B2 (en) | 2006-07-14 | 2013-01-08 | Saint-Gobain Abrasives, Inc. | Backingless abrasive article |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3684466A (en) * | 1971-01-28 | 1972-08-15 | Joseph V Petrone | Organic polymer bonded tumbling chip |
EP0523624A2 (en) * | 1991-07-18 | 1993-01-20 | ROLLWASCH ITALIANA S.p.A. | Agglomerated abrasive device particularly for tumbling and the like, and manufacturing process |
US5514192A (en) * | 1993-02-09 | 1996-05-07 | Grigsby, Jr.; Jerry L. | Plastic stonewashing stone and method |
WO1999032261A1 (en) * | 1998-02-19 | 1999-07-01 | Lee, Taek-Soo | Abrasive medium with selected density |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05311155A (en) * | 1992-05-07 | 1993-11-22 | Kanebo Ltd | Abradant for material to be abraded for amusement machine and abrading method using the same |
-
2000
- 2000-11-07 IT IT2000TO001045A patent/IT1320833B1/en active
-
2001
- 2001-11-02 DE DE60108464T patent/DE60108464T2/en not_active Expired - Lifetime
- 2001-11-02 AT AT01126093T patent/ATE287318T1/en not_active IP Right Cessation
- 2001-11-02 EP EP01126093A patent/EP1207011B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3684466A (en) * | 1971-01-28 | 1972-08-15 | Joseph V Petrone | Organic polymer bonded tumbling chip |
EP0523624A2 (en) * | 1991-07-18 | 1993-01-20 | ROLLWASCH ITALIANA S.p.A. | Agglomerated abrasive device particularly for tumbling and the like, and manufacturing process |
US5514192A (en) * | 1993-02-09 | 1996-05-07 | Grigsby, Jr.; Jerry L. | Plastic stonewashing stone and method |
WO1999032261A1 (en) * | 1998-02-19 | 1999-07-01 | Lee, Taek-Soo | Abrasive medium with selected density |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 018, no. 128 (C-1174), 2 March 1994 (1994-03-02) & JP 05 311155 A (KANEBO LTD), 22 November 1993 (1993-11-22) -& DATABASE WPI Section Ch, Week 199401 Derwent Publications Ltd., London, GB; Class A18, AN 1994-002377 XP002203284 & JP 05 311155 A (KANEBO LTD), 22 November 1993 (1993-11-22) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2881069A1 (en) * | 2005-01-27 | 2006-07-28 | Pierre Laujon | Metallic instrument e.g. surgical instrument, cleaning machine for e.g. hospital, has moving belt supporting loads of sand-milling tools and burnishing tools such as balls, where sand-milling tools are presented as deformable blocks |
WO2006079729A1 (en) * | 2005-01-27 | 2006-08-03 | Laujon, Marie Rose | Cleaning machine |
US7958900B2 (en) | 2005-01-27 | 2011-06-14 | Marie Rose Laujon | Scrubbing machine for cleaning instruments |
WO2007098856A1 (en) * | 2006-03-02 | 2007-09-07 | International Chips S.R.L. | Highly efficient abrasive preformed body for vibratory finishing of metallic and nonmetallic parts |
US8349041B2 (en) | 2006-07-14 | 2013-01-08 | Saint-Gobain Abrasives, Inc. | Backingless abrasive article |
Also Published As
Publication number | Publication date |
---|---|
EP1207011B1 (en) | 2005-01-19 |
ITTO20001045A0 (en) | 2000-11-07 |
EP1207011A3 (en) | 2002-09-04 |
IT1320833B1 (en) | 2003-12-10 |
DE60108464D1 (en) | 2005-02-24 |
ITTO20001045A1 (en) | 2002-05-07 |
ATE287318T1 (en) | 2005-02-15 |
DE60108464T2 (en) | 2005-12-29 |
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