(19)
(11) EP 2 067 573 A1

(12) EUROPEAN PATENT APPLICATION

(43) Date of publication:
10.06.2009 Bulletin 2009/24

(21) Application number: 08380328.8

(22) Date of filing: 01.12.2008
(51) International Patent Classification (IPC): 
B24C 11/00(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR
Designated Extension States:
AL BA MK RS

(30) Priority: 04.12.2007 ES 200703227

(71) Applicant: Tico S.A.
28004 Madrid (ES)

(72) Inventor:
  • Miranda Rojas, Antonio
    28004 Madrid (ES)

(74) Representative: Díaz de Bustamante y Terminel, Isidro 
Arcade & Asociados C/ Isabel Colbrand, 6-5th floor
28050 Madrid
28050 Madrid (ES)

   


(54) Abrasive for cutting by water jet


(57) Especially devised for the cutting of pieces of great hardness, such as, for example, pieces of steel, aluminium and metals in general, plastics, glasses, rocks and other; it consists of a high-density glass, with a density equal to or greater than 3.5 T/m3 and a granulometry less than 55% of the interior diameter of the nozzle of the water jet. With this new abrasive, practical results are achieved which are very similar to those of the classic abrasive used in this field, ground granite, but at considerably lower costs.


Description

OBJECT OF THE INVENTION



[0001] The present invention relates to a new abrasive especially devised to be used as an additive in a water jet cutting machine.

[0002] The object of the invention is to achieve a product which, correctly complying with its function as said abrasive, determines a substantial lowering of costs with respect to the abrasives conventionally used.

[0003] The invention is situated thus in the field of abrasive products, and more specifically in the industrial area of the raw materials used in cutting machines of different types of material such as steels and others.

BACKGROUND OF THE INVENTION



[0004] As is known, the water jet cutting machines, which can use simply water when soft materials are cut, such as, for example, rubber seals or other, require an abrasive when hard pieces are cut, such as, for example, pieces of steel.

[0005] The abrasives are selected in accordance with their hardness, durability, resistance to impact, granulometric distribution and, of course, price.

[0006] At present, and for these applications, granite, which is a natural mineral which is conveniently treated to obtain a suitable granulometry in this use as abrasive, is used, in practically exclusive form.

[0007] This mineral satisfactorily complies with its function, but nevertheless, has as fundamental problem a very high cost, so that this abrasive constitutes the element of greatest cost in the cutting operation.

DESCRIPTION OF THE INVENTION



[0008] The abrasive for cutting by water jet that the invention proposes resolves the aforementioned problem in a fully satisfactorily manner, so that maintaining very similar functional features to those of granite, it entails a substantial lowering of costs, which means that said abrasive can reach the consumer at a price which is a great deal lower.

[0009] This lowering of costs is due to the fact that the abrasive that the invention proposes consists of a high-density glass.

[0010] More specifically, the following components participate in said high-density glass:
  • Silicon oxide (SiO2) ..... between 18 and 32%
  • Iron oxide (Fe2O3) ..... between 20 and 50%
  • Zinc oxide (ZnO) ..... between 1 and 15%
  • Aluminium oxide (Al2O3)... between 4 and 16%
  • Calcium oxide (CaO)......... between 1 and 6%
  • Chromium (Cr), Tin (Sn), Lead (PB), Copper (Cu), Vanadium (V) and Sodium (Na)..... between 1 and 11 %


[0011] This mixture of oxides, with a density equal to or greater than 3.5 tons/m3 and with a granulometry, in turn, less than 55% of the interior diameter of the nozzle of the water jet, permits cutting materials that are normally cut by granite with a water jet, at a more economic price.

EXAMPLE OF PRACTICAL EMBODIMENT OF THE INVENTION



[0012] Using an "Injersoll Rand@" water jet, a high-density glass with the following composition was used as coadjuvant abrasive with the water:
  • SiO2..... 30%
  • Fe2O3..... 45%
  • ZnO ..... 7%
  • Al2O3..... 10%
  • CaO ..... 3%
  • Mixture of equal parts of Cr, Sn, Pb, Cu, V and Na....... 5%


[0013] This mixture, with a density of 3.9 and with a granulometry, in this case, less than 600 microns, gave the following comparative results compared with the use of classic granite, with a pressure of 3,100 kg for the machine, with a width of 1.3 mm in the loading nozzle, with a distance of 1.5 mm between the nozzle and the stainless steel, type 316 L thickness 12 mm:
  • Penetration time 25.47/22.53 sec.; similar.
  • Slightly inferior cutting quality.
  • Cost of the abrasive in the order of 70%.


[0014] It is gathered from the results obtained that, except in those cases where an extraordinary cutting quality is required, in all others the new abrasive is much more interesting for the consumer than the conventional abrasive based on ground granite.


Claims

1. Abrasive for cutting by water jet, of the type used for the cutting of pieces of considerable hardness, such as, for example, steels, aluminium and metals in general, plastics, glasses, rocks and other; characterized in that it consists of a high-density glass, duly ground.
 
2. Abrasive for cutting by water jet, according to the preceding claims, characterized in that the high-density glass has the following components:

- Silicon oxide (SiO2)..... between 18 and 32%

- Iron oxide (Fe2O3) ........ between 20 and 50%

- Zinc oxide (ZnO) ........... between 1 and 15%

- Aluminium oxide (Al2O3) . between 4 and 16%

- Calcium oxide (CaO) ..... between 1 and 6%

- Chromium (Cr), Tin (Sn), Lead (PB), Copper (Cu), Vanadium (V) and Sodium (Na)..... between 1 and 11%


 
3. Abrasive for cutting by water jet, according to the preceding claims, characterized in that the high-density glass has a density equal to or greater than 3.5 T/m3.
 
4. Abrasive for cutting by water jet, according to the preceding claims, characterized in that the high-density glass has a granulometry less than 55% of the interior diameter of the nozzle of the water jet.
 





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