Cutting – By fluid blast and/or suction
Patent
1994-01-27
1995-11-28
Peterson, Kenneth E.
Cutting
By fluid blast and/or suction
8369951, 83701, B24C 504
Patent
active
054697689
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a machining head referred to as VHP (very high pressure, namely about 4000 bars) for a water jet cutting machine intended for high precision machining. More specifically, this invention concerns a machining head including regulating means permitting the adjustment in a systematic and repetitive fashion of the direction of the water jet within the interior of such head.
Additionally, the invention concerns an aiming device intended to equip a head including the above mentioned means.
Machining heads intended to equip water jet cutting machines typically include a casing or mounting which is intended to be fixedly mounted on an "XY" orientation table or on an articulated robot mounted on a carriage.
Within such head is housed in addition an acceleration nozzle which is fixed to the casing and which is connected by appropriate piping, to a feed source furnishing water possibly with additives, at very high pressures.
The acceleration nozzle has as function to bring the water which it receives from admission means to a very high velocity, in particular supersonic, in order to form a coherent water jet capable of perforating in a well-defined and precise fashion any material whatsoever in a part to be machined.
To this effect, the acceleration nozzle includes at its output a suitably perforated regulating tip formed of very hard material such as sapphire or corundum.
Furthermore, the machining head includes at its output a cutting pipe mounted in the head facing the acceleration nozzle, that is to say downstream from the regulating tip in the interior of a pipe carrier housed in the casing. Additionally, a supply tube for an abrasive is placed between the output of said nozzle and said pipe.
The pipe thus receives the water jet emitted by the acceleration nozzle as well as the abrasive agent which it must guide towards the part to be cut.
Consequently, the cutting pipe must be arranged in a manner perfectly coaxial relative to the water jet.
It is thus understood that any alignment defect between the water jet emitted by the nozzle and the pipe will bring about whistling and, if such defect is not corrected prior to the machining operation, premature wear of the pipe.
It is thus necessary to furnish regulating means capable of assuring the adjustment of such water jet, discharged in an "accelerated" fashion and under very high pressure relative to the pipe.
Thus, the present invention has as purpose to furnish a machining head including regulating means which are capable of assuring the perfect orientation of the water jet emitted by the acceleration nozzle relative to the cutting pipe and which is of a simple conception, sturdy, while being capable of assuring rapid, repetitive and reliable regulation of such orientation.
The present invention has also as purpose to furnish an aiming device capable of equipping such a head.
To this effect, the present invention has as object a machining head for a water jet cutting machine, comprising: pressure, means, such nozzle being intended to form a jet of water at high velocity, suitable to effect cutting of a material, acceleration nozzle, and casing, such head being characterized in that it includes regulating means which permit regulation of the position of the pipe carrier relative to the casing in order to adjust the orientation of the cutting pipe in a fashion coaxial to the jet emitted by the nozzle.
Thus, it will be understood that, thanks to this characteristic, the acceleration nozzle can be provided fixed relative to the casing which simplifies considerably the overall conception of the head according to the invention and assures its sturdiness. This characteristic also permits assuring, in a simple fashion, the centering of the regulating tip, in particular by the agency of a tube which forms part of such acceleration nozzle and which is fixedly mounted relative to the casing.
According to another characteristic of the invention, the regulating means comprise furthermore an aiming device including a target housed in a support ar
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