TECHNICAL FIELD
[0001] The present invention relates to an abrasive water jet cutting nozzle according to
the preamble of claim 1.
TECHNICAL BACKGROUND
[0002] A water jet cutting machine is an industrial tool capable of cutting a wide variety
of materials using a high-pressure jet of water, or a mixture of water and abrasive
material. Water jet cutting machines are often used during fabrication of machine
parts. Water jet cutting is a preferred method when the material being cut is sensitive
to high temperatures generated by other machining methods. It is used in various industries
including mining and aerospace for cutting, shaping, and reaming.
[0003] To enhance the cutting power of the water jet cutting machine, abrasive material
is added to the water jet. This technique is called abrasive water jet cutting and
enables cutting through dense materials such as metal or granite. An abrasive water
jet cutting machine comprises a water pump which increases the pressure of the water.
It also comprises an abrasive water jet cutting nozzle with a jewel element holder
comprising a jewel element having a small orifice. The water is forced through the
jewel element to generate a high-velocity water jet. The abrasive material is added
to the water downstream from the orifice of the jewel element into a mixing chamber,
wherein the abrasive material is mixed with the water jet. After passing through the
mixing chamber, the abrasive jet exits from the mixing chamber through an elongated
outlet nozzle called focusing tube, which accelerates the jet and directs the jet
toward the work piece being cut.
[0004] The mixing chamber can be a single component or it can be integrated in the focusing
tube. A focusing tube which does not comprise a mixing chamber, a mixing chamber which
is not integrated in a focusing tube, a focusing tube with integrated mixing chamber
and a jewel element holder are all removably insertable in the abrasive water jet
cutting nozzle. The focusing tube and the mixing chamber are the most wearable parts
in the water jet cutting machine due to the presence of abrasive material suspended
in the high-velocity water jet and therefore needs to be replaced periodically depending
on requested cutting quality requirements.
[0005] It is expensive and time consuming to replace the focusing tube and the mixing chamber.
To maximize the life of the focusing tube and the mixing chamber it is important that
the focusing tube, the mixing chamber and the jewel element are in axial alignment.
If the focusing tube, the mixing chamber and the jewel element are not concentrically
arranged, the water forced through the jewel element will be off centre with respect
to the mixing chamber and the jet exiting the mixing chamber will be off centre with
respect to the focusing tube. That will result in increased component wear due to
collisions between the jet and the inner sides of the mixing chamber and the focusing
tube. It may also result in degrading the jet stream itself to such an extent that
the cutting ability of the abrasive water jet cutting nozzle is reduced. That results
in that the cutting process is slowed and an excess of abrasive material is consumed
in performing the cutting operation.
[0006] A problem with abrasive water jet cutting nozzles on the market today is that it
is difficult and time consuming to concentrically arrange the jewel element, the mixing
chamber and the focusing tube in the abrasive water jet cutting nozzle. The fluid
path through the abrasive water jet cutting nozzle is several centimetres long and
therefore even small alignment errors are enough to cause increased wear. The persons
who replaces and aligns the jewel element, the mixing chamber and the focusing tube
in the abrasive water jet cutting nozzle must have a certain degree of skill to be
able to accomplish these tasks. Even if the persons have a certain degree of skill
the tasks involves the risk of human error in alignment.
[0007] Components with tight tolerances are used to ensure that the jewel element, the mixing
chamber and the focusing tube are in axial alignment. It is however expensive to manufacture
components with tight tolerances because machining and inspection of the components
are time consuming and the component rejection rate increases. Even if the components
have tight tolerances it is difficult to achieve a jewel element, a mixing chamber
and a focusing tube that are concentrically arranged because the several tolerances
need to cooperate with each other.
[0008] An example of a known cutting head for a water jet cutting machine is shown in document
US-5018670-A. The cutting head disclosed in document
US-5018670-A has a generally upright body having a water inlet chamber. The cutting head further
comprises a coupling having a passage open to the chamber to deliver ultra high pressure
water to the chamber. An internal threaded sleeve having threads at the upper end
of the body accommodates a male threaded end of the coupling. Because the body and
the coupling are threadedly connected to each other it is difficult to reach a perfect
alignment of the jewel element, the mixing chamber and the focusing tube.
[0009] All the above problems result in less efficient manufacturing processes and higher
manufacturing costs in industries using water jet cutting machines.
[0010] As a consequence, in light of the above drawbacks, there is a need of an improved
abrasive water jet cutting nozzle which allows the jewel element, the mixing chamber
and the focusing tube to be axial aligned so as to minimize wear due to misalignment
and thereby maximize the life of the focusing tube and the mixing chamber. There is
also a need of an improved abrasive water jet cutting nozzle which provides for easy
and quick replacement of wear parts and that is less time consuming and less expensive
to produce.
[0011] An improved abrasive water jet cutting nozzle will allow more efficient manufacturing
processes and lower manufacturing costs in industries using water jet cutting machines.
SUMMARY OF THE INVENTION
[0012] The subject of the present invention is to eliminate the drawbacks according to prior
art.
[0013] This subject has been by fulfilled with the abrasive water jet cutting nozzle according
to claim 1. The dependent claims refer to preferred embodiments of the invention.
[0014] More specifically the abrasive water jet cutting nozzle comprises a mixing chamber,
an abrasive material inlet in communication with the mixing chamber and a focusing
tube. The focusing tube comprises a first focusing tube portion, a second focusing
tube portion, an intermediate focusing tube portion and a conduit. The intermediate
focusing tube portion is arranged between the first focusing tube portion and the
second focusing tube portion. The abrasive water jet cutting nozzle further comprises
a collet arranged in circumferential abutment to the intermediate focusing tube portion.
The collet comprises a first collet portion and a second collet portion. The abrasive
water jet cutting nozzle further comprises a first body having an upper first body
portion, a lower first body portion and an intermediate first body portion. The intermediate
first body portion is arranged between the upper first body portion and the lower
first body portion. The first body is supporting a jewel element holder comprising
a jewel element with an orifice and is arranged in circumferential abutment to the
first collet portion, the first focusing tube portion and the mixing chamber. The
first body comprises a first downwardly diverging frusto conical shaped recess and
the collet comprises a first downwardly diverging frusto conical shaped surface adapted
to fit in the first downwardly diverging frusto conical shaped recess.
[0015] The abrasive water jet cutting nozzle further comprises a second body. The second
body comprises an upper second body portion, a lower second body portion and a water
inlet. The second body is arranged in circumferential abutment to the upper first
body portion and the jewel element holder. Further, the second body comprises a second
downwardly diverging frusto conical shaped recess. The first body comprises a second
downwardly diverging frusto conical shaped surface adapted to fit into the second
downwardly diverging frusto conical shaped recess.
[0016] This result in that the first body and the jewel element holder are self centred
when inserted into the second body and that the collet, and thereby also the focusing
tube and the mixing chamber, are self centred when inserted into the first body. Thereby
the conduit of the focusing tube, the mixing chamber and the orifice of the jewel
element are always in axial alignment when inserted in the water jet cutting nozzle.
Thus the focusing tube, the mixing chamber and the jewel element holder can be removed
and replaced with new parts without realigning and an accurate tool centre point,
i.e. a point lying on a centre line of the water jet cutting nozzle and at the downstream
end thereof, is always maintained. The wear due to misalignment is minimized and thereby
the life of the focusing tube and the mixing chamber is maximized. Also components
with less tight tolerances can be used, which results in an abrasive water jet cutting
nozzle that is less time consuming and less expensive to produce. This will in turn
allow more efficient manufacturing processes and lower manufacturing costs in industries
using water jet cutting machines.
[0017] In another aspect of the invention the jewel element holder is integrated in the
first body. This results in that the abrasive water jet cutting nozzle comprises fewer
components. Thereby fewer tolerances need to cooperate with each other and the assembling
of the abrasive water jet cutting nozzle's components is simplified.
[0018] In a further aspect of the invention the mixing chamber is integrated in the focusing
tube. This results in that the mixing chamber and the focusing tube always are axially
aligned. Further, it results in that the abrasive water jet cutting nozzle comprises
fewer components. Thereby fewer tolerances need to cooperate with each other and the
assembling of the abrasive water jet cutting nozzle's components is simplified. This
also results in that air is prevented from leaking between the mixing chamber and
the focusing tube and thereby air is prevented from disturbing the water jet inside
the abrasive water jet cutting nozzle.
[0019] In yet another aspect of the invention the abrasive water jet cutting nozzle further
comprises a first locking means arranged in circumferential abutment to the second
collet portion and the lower first body portion. The first locking means provides
for easy and quick replacement of a worn mixing chamber and a worn focusing tube.
[0020] In another aspect of the invention the abrasive water jet cutting nozzle further
comprises a second locking means arranged in circumferential abutment to the intermediate
first body portion and the lower second body portion. The second locking means provides
for easy and quick replacement of a worn jewel element and a worn jewel element holder.
[0021] In a further aspect of the invention the second body further comprises a third downwardly
diverging frusto conical shaped recess. The third downwardly diverging frusto conical
shaped recess is adapted to fit onto the jewel element holder.
[0022] The abrasive water jet cutting nozzle will allow more efficient manufacturing processes
and thereby lower manufacturing costs in industries using water jet cutting machines.
[0023] Other objectives, embodiments and advantages of the present invention are described
in closer detail in the description and in the subsequent patent claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In the following prior art and the invention will be described with reference to
embodiments of prior art, embodiments of the present invention and the accompanying
drawings, in which:
- Fig. 1
- shows a schematic view of an abrasive water jet cutting system according to prior
art,
- Fig. 2
- shows a cross sectional view of an abrasive water jet cutting nozzle according to
prior art,
- Fig. 3a
- shows a cross sectional view of the abrasive water jet cutting nozzle in a first embodiment
according to the present invention, and
- Fig. 3b
- shows a cross sectional view of the abrasive water jet cutting nozzle in a second
embodiment according to the present invention.
DETAILED DESCRIPTION OF PRIOR ART AND THE INVENTION
[0025] In the following a number of embodiments of prior art and the invention are shown
and described. The same reference numbers have been used for the same or similar features
throughout the description in the embodiments disclosed below.
[0026] Fig. 1 shows a schematic view of an abrasive water jet cutting system 1 according
to prior art and fig. 2 shows a cross sectional view of an abrasive water jet cutting
nozzle 2 according to prior art. The abrasive water jet cutting system 1 will be described
with reference to both fig. 1 and fig. 2. The abrasive water jet cutting system 1
comprises a water pump 4. Water 6 is supplied to the water pump 4 from a source of
water 8 through a water conduit 10. The water pump 4 increases the pressure of the
water 6 to generate desired water pressure.
[0027] The abrasive water jet cutting nozzle 2 comprises an inlet body 12. The inlet body
12 comprises a water inlet 14 with a jewel element holder 16 comprising a jewel element
17 having a small diameter orifice 18, at an upstream end 20 of the inlet body 12.
The jewel element 17 can for example comprise sapphire, ruby or diamond or any other
erosion resistant material. Water 6 is supplied to the water inlet 14 of the abrasive
water jet cutting nozzle 2 from the water pump 4 through the water conduit 10. The
water 6 is forced through the jewel element 17 to generate a high-velocity water jet
which travels longitudinally towards a downstream end 22 of the jewel element holder
16.
[0028] To enhance the cutting properties of the jet, abrasive material 24 is added to the
water jet. The abrasive material 24 can for example comprise garnet, silica or aluminium
oxide. The abrasive water jet cutting nozzle 2 comprises, downstream from the orifice
18 of the jewel element 17, an abrasive material inlet 26. The abrasive material 24
is transported from a source of abrasive 28 to the abrasive material inlet 26 through
an abrasive material conduit 30. The abrasive material inlet 26 is in direct communication
with a longitudinally extending mixing chamber 32, wherein the abrasive material 24
is received and mixed with the water 6.
[0029] After passing through the mixing chamber 32, the abrasive jet exits from the mixing
chamber 32 through an elongated outlet nozzle called focusing tube 34, which is inserted
in the abrasive water jet cutting nozzle 2 and which accelerates the jet and directs
the jet toward the work piece being cut 36. The water jet cutting focusing tube 34
comprises an outlet 38 at a downstream end 40 of the water jet cutting focusing tube
34. The jet 42 (comprising abrasive and water) exits from the water jet cutting focusing
tube 34 through the outlet 38. The mixing chamber 32 can be a single component or
it can be integrated in the water jet cutting focusing tube 34. All the above mentioned
parts in the abrasive water jet cutting nozzle 2, except for the jewel element 17
and the water jet cutting focusing tube 34, are usually comprising high tensile strength
steel so as to withstand hydrostatic pressures and related hydrodynamic shock loads
during operation of the abrasive water jet cutting nozzle 2. The water jet cutting
focusing tube 34 usually comprises tungsten carbide or ceramic material.
[0030] Fig. 3a shows a cross sectional view of the abrasive water jet cutting nozzle 44
in a first embodiment according to the present invention. The abrasive water jet cutting
nozzle 44 comprises a mixing chamber 46, an abrasive material inlet 48 in communication
with the mixing chamber 46 and a focusing tube 50 with a circular cross section. The
mixing chamber 46 can be a single component or it can be integrated in the focusing
tube 50. Preferably, the mixing chamber 46 is integrated in the focusing tube 50.The
focusing tube 50 comprises a first focusing tube portion 52, a second focusing tube
portion 54 and an intermediate focusing tube portion 56. The intermediate focusing
tube portion 56 is arranged between the first focusing tube portion 52 and the second
focusing tube portion 54. The focusing tube 50 further comprises a conduit 58 in the
centre of the focusing tube 50. The conduit 58 is in fluid communication with the
mixing chamber 46. The abrasive water jet cutting nozzle 44 further comprises a collet
60 arranged in circumferential abutment to the intermediate focusing tube portion
56. The collet 60 comprises a first collet portion 62 and a second collet portion
64.
[0031] The abrasive water jet cutting nozzle 44 further comprises a first body 66. The first
body 66 comprises an upper first body portion 68, a lower first body portion 70 and
an intermediate first body portion 72. The intermediate first body portion 72 is arranged
between the upper first body portion 68 and the lower first body portion 70. The first
body 66 supports a jewel element holder 74 and is arranged in circumferential abutment
to the first collet portion 62, the first focusing tube portion 52 and the mixing
chamber 46. The jewel element holder 74 comprises a jewel element 75. The jewel element
holder 74 and the jewel element 75 are coaxially arranged to each other. The jewel
element 75 is arranged in the portion of the jewel element holder 74 furthest away
from the first body 66. The jewel element 75 comprises, in the centre of the jewel
element 75, an orifice 76. The orifice 76 is in fluid communication with the mixing
chamber 46. The jewel element holder 74 can be a single component or it can be integrated
in the first body 66. Preferably, the jewel element holder 74 is integrated in the
first body 66. The first body 66 comprises a first downwardly diverging frusto conical
shaped recess 78 and the collet 60 comprises a first downwardly diverging frusto conical
shaped surface 80 adapted to fit in the first downwardly diverging frusto conical
shaped recess 78. The collet 60 has a cylindrical inner surface 81.
[0032] The abrasive water jet cutting nozzle 44 further comprises a second body 82. The
second body 82 comprises an upper second body portion 84, a lower second body portion
86 and a water inlet 88. The abrasive material inlet 48 extends generally radially,
at an angle α with respect to a longitudinal centre axis A of the abrasive water jet
cutting nozzle 44, from the exterior of the second body 82 to the mixing chamber 46.
Preferably, the angle α can be about 60 degrees. An angle α of about 60 degrees permits
a smooth flow and efficient entrainment of the abrasive material in the water. However,
the present invention is not limited to an angle α of 60 degrees since any angle between
about 0 to about 90 degrees is possible. The second body 82 is arranged in circumferential
abutment to the upper first body portion 68 and the jewel element holder 74. The second
body 82 comprises a second downwardly diverging frusto conical shaped recess 90 and
a third downwardly diverging frusto conical shaped recess 92. The first body 66 comprises
a second downwardly diverging frusto conical shaped surface 94 adapted to fit into
the second downwardly diverging frusto conical shaped recess 90. The third downwardly
diverging frusto conical shaped recess 92 is adapted to fit onto the jewel element
holder 74. In the embodiment in fig. 3a a jewel element holder 74 with a conical outer
surface is shown. Preferably, the jewel element holder 74 comprises a conical outer
surface. However, it is possible for the jewel element holder 74 to not comprise a
conical outer surface. For example, the jewel element holder 74 can only comprise
a cylindrical outer surface.
[0033] The first downwardly diverging frusto conical shaped recess 78 and the first downwardly
diverging frusto conical shaped surface 80 extends at an angle β with respect to the
longitudinal centre axis A of the abrasive water jet cutting nozzle 44. The second
downwardly diverging frusto conical shaped recess 90 and the second downwardly diverging
frusto conical shaped surface 94 extends at an angle γ with respect to the longitudinal
centre axis A of the abrasive water jet cutting nozzle 44. The third downwardly diverging
frusto conical shaped recess 92 and the conical surface of the jewel element holder
74 extends at an angle δ with respect to the flat upper surface of the jewel element
75. The angle γ and γ can be in the range from about 0 degrees to about 45 degrees
and they do not have to be the same. For example angle β can be 6 degrees and the
angle γ can be 12 degrees. The angle δ can be in the range from about 0 degrees to
about 60 degrees.
[0034] The abrasive water jet cutting nozzle 44 further comprises a first locking means
96 arranged in circumferential abutment to the second collet portion 64 and the lower
first body portion 70. The first locking means 96 comprises an upstream inner wall
97. The upstream inner wall 97 and the lower first body portion 70 are threadedly
engaged (not shown). Further, the abrasive water jet cutting nozzle 44 comprises a
second locking means 98 arranged in circumferential abutment to the intermediate first
body portion 72 and the lower second body portion 86. The second locking means 98
is threadedly engaged (not shown) to the intermediate first body portion 72 and the
lower second body portion 86.
[0035] The focusing tube 50 and the mixing chamber 46 wear out quicker and thereby needs
to be replaced more often than the jewel element holder 74 and the jewel element 75.
It is therefore advantageous with an abrasive water jet cutting nozzle 44 comprising
two locking means 96, 98 instead of one locking means because thereby not all the
components of the abrasive water jet cutting nozzle 44 need to be reassembled when
the jewel element holder 74, the jewel element 75, the mixing chamber 46 or the focusing
tube 50 is replaced.
[0036] Fig. 3b shows a cross sectional view of the abrasive water jet cutting nozzle 44
in a second embodiment according to the present invention. The first and the second
embodiment is the same except from that the abrasive water jet cutting nozzle 44 in
the second embodiment comprises a water inlet body 99 and it is the water inlet body
99 that comprises the water inlet 88. The water inlet body 99 is removably insertable
in the second body 82. The water inlet body 99 and the second body 82 can be threadedly
(not shown) connected to each other. Thus, the second body 82 is in circumferential
abutment to the water inlet body 99. The water inlet body 99 comprises a fourth downwardly
diverging frusto conical shaped recess 92' adapted to fit onto'the jewel element holder
74. The fourth downwardly diverging frusto conical shaped recess 92' extends at an
angle δ with respect to the flat upper surface of the jewel element 75.The angle δ
can be in the range from about 0 degrees to 60.
[0037] During use of the abrasive water jet cutting nozzle 44, water is supplied to the
water inlet 88 of the second body 82 (according to fig. 3a) or of the water inlet
body 99 (according to fig. 3b). The water is forced through the jewel element 75 to
generate a high-velocity water jet which travels longitudinally towards a downstream
end 100 of the jewel element holder 74. The mixing chamber 46 receives abrasive material
from the abrasive material inlet 48 and the abrasive material is mixed with the water
jet in the mixing chamber 46. After passing through the mixing chamber 46, the abrasive
jet exits from the mixing chamber 46 through the focusing tube 50, which accelerates
the jet and directs the jet toward the work piece being cut. The focusing tube 50
comprises an outlet 102 at a downstream end 104 of the conduit 58. The jet (comprising
abrasive and water) exits from the focusing tube 50 through the outlet 102.
[0038] The present invention is of course not in any way restricted to the preferred embodiments
described above, but many possibilities to modifications, or combinations of the described
embodiments, thereof should be apparent to a person with ordinary skill in the art
without departing from the scope of the invention as defined in the appended claims.
[0039] The liquid most frequently used to form a jet is water, but numerous other liquids
can be used without departing from the scope of the invention, and the recitation
of the jet comprising water should not be interpreted as a limitation.
1. Abrasive water jet cutting nozzle (44) comprising a mixing chamber (46), an abrasive
material inlet (48) in communication with the mixing chamber (46), a focusing tube
(50), having a first focusing tube portion (52), a second focusing tube portion (54),
an intermediate focusing tube portion (56), arranged between the first focusing tube
portion (52) and the second focusing tube portion (54), and a conduit (58), further
comprising a collet (60) arranged in circumferential abutment to the intermediate
focusing tube portion (56) and having a first collet portion (62) and a second collet
portion (64), further comprising a first body (66) having an upper first body portion
(68), a lower first body portion (70) and an intermediate first body portion (72),
arranged between the upper first body portion (68) and the lower first body portion
(70), wherein the first body (66) is supporting a jewel element holder (74) comprising
a jewel element (75) with an orifice (76) and is arranged in circumferential abutment
to the first collet portion (62), the first focusing tube portion (52) and the mixing
chamber (46), wherein the first body (66) comprises a first downwardly diverging frusto
conical shaped recess (78) and the collet (60) comprises a first downwardly diverging
frusto conical shaped surface (80) adapted to fit in the first downwardly diverging
frusto conical shaped recess (78), characterized by
further comprising a second body (82), having an upper second body portion (84), a
lower second body portion (86) and a water inlet (88), arranged in circumferential
abutment to the upper first body portion (68) and the jewel element holder (74), wherein
the second body (82) comprises a second downwardly diverging frusto conical shaped
recess (90) and the first body (66) comprises a second downwardly diverging frusto
conical shaped surface (94) adapted to fit into the second downwardly diverging frusto
conical shaped recess (90), such that the focusing tube (50), the mixing chamber (46)
and the jewel element (75) are in axial alignment.
2. The abrasive water jet cutting nozzle according to claim 1, characterized in that the jewel element holder (74) is integrated in the first body (66).
3. The abrasive water jet cutting nozzle according to claim 1 or 2, characterized in that the mixing chamber (46) is integrated in the focusing tube (50).
4. The abrasive water jet cutting nozzle according to any one of the above claims, characterized in that the abrasive water jet cutting nozzle (44) further comprises a first locking means
(96) arranged in circumferential abutment to the second collet portion (64) and the
lower first body portion (70).
5. The abrasive water jet cutting nozzle according to any one of the above claims, characterized in that the abrasive water jet cutting nozzle (44) further comprises a second locking means
(98) arranged in circumferential abutment to the intermediate first body portion (72)
and the lower second body portion (86).
6. The abrasive water jet cutting nozzle according to any one of the above claims, characterized in that the second body (82) comprises a third downwardly diverging frusto conical shaped
recess (92) adapted to fit onto the jewel element holder (74).
1. Abrasive Wasserstrahlschneiddüse (44) umfassend eine Mischkammer (46), einen mit der
Mischkammer (46) in Verbindung stehenden abrasiven Materialeinlauf (48), ein Fokussierrohr
(50), aufweisend einen ersten Fokussierrohrteil (52), einen zweiten Fokussierrohrteil
(54), einen zwischenliegenden zwischen dem ersten Fokussierrohrteil (52) und dem zweiten
Fokussierrohrteil (54) angeordneten Fokussierrohrteil (56) und eine Leitung (58),
zusätzlich umfassend ein Spannfutter (60), welches so angeordnet ist, dass es umfänglich
an dem zwischenliegenden Fokussierrohrteil (56) anliegt, und einen ersten Spannfutterteil
(62) und einen zweiten Spannfutterteil (64) aufweist, zusätzlich umfassend einen ersten
Körper (66), welcher einen oberen ersten Körperteil (68), einen unteren ersten Körperteil
(70) und einen zwischenliegenden ersten zwischen dem oberen ersten Körperteil (68)
und dem unteren ersten Körperteil (70) angeordneten Körperteil (72) aufweist, wobei
der erste Körper (66) einen Juwelen-Element-Halter (74) trägt, welches ein Juwelenelement
(75) mit einer Öffnung (76) umfasst und so angeordnet ist, dass es umfänglich an dem
ersten Spannfutterteil (62), dem ersten Fokussierrohrteil (52) und der Mischkammer
(46) anliegt, wobei der erste Körper (66) eine erste nach unten abzweigende kegelstumpfförmige
Ausnehmung (78) umfasst, und das Spannfutter (60) eine erste nach unten abzweigende
kegelstumpfförmige Oberfläche (80) umfasst, die zum Hineinpassen in die erste nach
unten abzweigende kegelstrumpfförmige Ausnehmung (78) ausgelegt ist, dadurch gekennzeichnet, dass
dass sie zusätzlich einen zweiten Körper (82) umfasst, welcher einen oberen zweiten
Körperteil (84), einen unteren zweiten Körperteil (86) und einen Wassereinlauf (88)
aufweist, umfänglich am oberen ersten Körperteil (68) und dem Juwelen-Element-Halter
(74) anliegend angeordnet, wobei der zweite Körper (82) eine zweite nach unten abzweigende
kegelstumpfförmige Ausnehmung (90) umfasst, und der erste Körper (66) eine zweite
nach unten abzweigende kegelstumpfförmige Oberfläche (94) umfasst, die zum Hineinpassen
in die zweite nach unten abzweigende kegelstumpfförmige Ausnehmung (90) ausgelegt
ist, so dass das Fokussierrohr (50), die Mischkammer (46) und das Juwelenelement (75)
axial ausgerichtet sind.
2. Abrasive Wasserstrahlschneiddüse nach Anspruch 1, dadurch gekennzeichnet, dass der Juwelen- Element-Halter (74) in den ersten Körper (66) eingebunden ist.
3. Abrasive Wasserstrahlschneiddüse nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Mischkammer (46) in das Fokussierrohr (50) eingebunden ist.
4. Abrasive Wasserstrahlschneiddüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die abrasive Wasserstrahlschneiddüse (44) ferner ein erstes Verriegelungsmittel (96)
umfasst, das so angeordnet ist, dass es umfänglich an dem zweiten Spannfutterteil
(64) und dem unteren ersten Körperteil (70) anliegt.
5. Abrasive Wasserstrahlschneiddüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die abrasive Wasserstrahlschneiddüse (44) ferner ein zweites Verriegelungsmittel
(98) umfasst, das so angeordnet ist, dass es umfänglich am zwischenliegenden ersten
Körperteil (72) und dem unteren zweiten Körperteil (86) anliegt.
6. Abrasive Wasserstrahlschneiddüse nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zweite Körper (82) eine dritte nach unten abzweigende kegelstumpfförmige Ausnehmung
(92) umfasst, welche zum Aufsetzen auf das Juwelen-Element-Halter (74) ausgelegt ist.
1. Buse de coupe à jet d'eau abrasif (44) comprenant une chambre de mélange (46), une
entrée de matériau abrasif (48) en communication avec la chambre de mélange (46),
un tube de focalisation (50), possédant une première partie de tube de focalisation
(52), une deuxième partie de tube de focalisation (54), une partie intermédiaire de
tube de focalisation (56), disposée entre la première partie du tube de focalisation
(52) et la deuxième partie du tube de focalisation (54), et un conduit (58), comprenant
en outre une bague (60) disposée en butée circonférentielle sur la partie intermédiaire
du tube de focalisation (56) et possédant une première partie de bague (62) et une
seconde partie de bague (64), comprenant en outre un premier corps (66) possédant
une partie supérieure du premier corps (68), une partie inférieure du premier corps
(70) et une partie intermédiaire du premier corps (72), disposée entre la partie supérieure
du premier corps (68) et la partie inférieure du premier corps (70), dans laquelle
le premier corps (66) soutient un support d'élément de joyau (74) comprenant un élément
de joyau (75) avec un orifice (76) et est disposé en butée circonférentielle sur la
première partie de bague (62), la première partie du tube de focalisation (52) et
la chambre de mélange (46), dans laquelle le premier corps (66) comprend un premier
évidement de forme tronconique divergent vers le bas (78) et la bague (60) comprend
une première surface de forme tronconique divergente vers le bas (80) conçue pour
s'adapter dans le premier évidement de forme tronconique divergent vers le bas (78),
caractérisée en ce qu'elle comprend en outre un second corps (82), possédant une partie supérieure du second
corps (84), une partie inférieure du second corps (86) et une entrée d'eau (88), disposé
en butée circonférentielle sur la partie supérieure du premier corps (68) et le support
d'élément de joyau (74), dans laquelle le second corps (82) comprend un deuxième évidement
de forme tronconique divergent vers le bas (90) et le premier corps (66) comprend
une seconde surface de forme tronconique divergente vers le bas (94) conçue pour s'adapter
dans le deuxième évidement de forme tronconique divergent vers le bas (90), de telle
sorte que le tube de focalisation (50), la chambre de mélange (46) et l'élément de
joyau (75) sont en alignement axial.
2. Buse de coupe à jet d'eau abrasif selon la revendication 1, caractérisée en ce que le support d'élément de joyau (74) est intégré dans le premier corps (66).
3. Buse de coupe à jet d'eau abrasif selon la revendication 1 ou 2, caractérisée en ce que la chambre de mélange (46) est intégrée dans le tube de focalisation (50).
4. Buse de coupe à jet d'eau abrasif selon l'une quelconque des revendications précédentes,
caractérisée en ce que la buse de coupe à jet d'eau abrasif (44) comprend en outre un premier moyen de verrouillage
(96) disposé en butée circonférentielle sur la seconde partie de la bague (64) et
la partie inférieure du premier corps (70).
5. Buse de coupe à jet d'eau abrasif selon l'une quelconque des revendications précédentes,
caractérisée en ce que la buse de coupe à jet d'eau abrasif (44) comprend en outre un second moyen de verrouillage
(98) disposé en butée circonférentielle sur la partie intermédiaire du premier corps
(72) et la partie inférieure du second corps (86).
6. Buse de coupe à jet d'eau abrasif selon l'une quelconque des revendications précédentes,
caractérisée en ce que le second corps (82) comprend un troisième évidement de forme tronconique divergent
vers le bas (92) conçu pour s'adapter sur le support d'élément de rubis (74).