JP2000225528A - High pressure water jetting device - Google Patents

Abstract

(57) [Problem] To continuously and uniformly separate the surface layer of an object even when the distance between the nozzle and the object is changed due to distortion or the like of the separation surface of the object. A high-pressure water jetting device is provided. A high-pressure water jetting device for jetting high-pressure water from a nozzle (22) relatively moving with respect to an object (F) to continuously separate the surface layer of the object (F), comprising: Detection mechanism 23 for detecting the distance from the object to the object F
And control means 3 for setting the use condition of the nozzle 22 based on the detection result of the detection mechanism 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure water jetting device for jetting high-pressure water from a nozzle which moves relatively to an object to separate the surface layer.

[0002]

2. Description of the Related Art A technique using a high-pressure water jetting device has been proposed for peeling various coating layers formed on a metal surface or the like. For example, a fan case of an aircraft engine has a cylindrical shape, and a ceramic coating layer for heat resistance, abrasion resistance and the like is formed on an inner surface thereof. When the fan case is maintained, the coating layer may be peeled off by a high-pressure water jetting device. This high-pressure water jetting device generally includes, for example, a rotatable table on which an object to be peeled such as a fan case is mounted, a nozzle arranged at a predetermined distance from the peeling surface of the object to be peeled, and And an articulated arm for disposing. In the conventional high-pressure water jetting device, the object to be separated mounted on the table is rotated, and high-pressure water is jetted from the nozzle to the object to be separated.
The coating layer (surface layer) formed on the separation target is separated.

[0003]

However, in the conventional high-pressure water jetting device, when the high-pressure water is jetted from the nozzle, the nozzle remains stopped at a predetermined position with respect to the rotating peeling target. Therefore, when the cross-sectional shape of the object to be peeled is distorted like an ellipse that is not a perfect circle, the distance between the nozzle and the object changes, and high-pressure water does not act properly on the surface to be peeled. In some cases, the surface layer is not uniformly separated, and some surface layers may remain without being separated. In particular, the fan case is unlikely to be removed as a perfect circle due to plastic deformation due to heat or misalignment in mounting accuracy, and is often elliptical.

[0004] The present invention has been made in view of such a problem, and even if the distance between the nozzle and the object changes due to distortion of the peeled surface of the object or the like, the object can be removed. It is an object of the present invention to provide a high-pressure water jetting device for continuously and uniformly separating a surface layer.

[0005]

According to a first aspect of the present invention, a high-pressure water is jetted from a nozzle which moves relative to an object to spray the high-pressure water onto the object. Is a high-pressure water jetting device that continuously separates nozzles, and employs a technology that includes a detection mechanism that detects a distance from a nozzle to the object, and control means that sets use conditions of the nozzle based on a detection result of the detection mechanism. Is done. In this high-pressure water jet device, even if the distance between the nozzle and the object changes, the control means sets the use conditions of the nozzle suitable for peeling the surface layer from the result of detecting the distance by the detection mechanism. Then, the surface layer is peeled off under the conditions of use.

According to a second aspect of the present invention, in the high-pressure water jetting device of the first aspect, the control means moves at least one of the nozzle and the object so that the nozzle and the object are maintained at a substantially constant distance. The technology to be used is adopted. In this high-pressure water ejection device, even if the distance between the nozzle and the object changes, the control means moves one of the nozzle and the object based on the detection result of the distance, and Is maintained at a substantially constant distance suitable for peeling the surface layer.

[0007] The invention according to claim 3 is the invention according to claim 1 or 2.
In the high-pressure water jetting device described above, a technology is employed in which the detection mechanism detects the distance between the nozzle and the high-pressure water in advance at the point where the high-pressure water hits the nozzle. This high-pressure water jetting device detects the distance between the nozzle and the high-pressure water in advance at the point where the high-pressure water hits the nozzle in advance, and when the high-pressure water is jetted to that point, the nozzle operating conditions suitable for peeling off that point Is set by the control means, and the surface layer is peeled off under the use conditions.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an overall side view of the high-pressure water jetting device, and FIG. 2 is a sectional view taken along line AA of FIG. Reference numeral 1 denotes a table on which the object F is mounted, reference numeral 2 denotes an arm, and reference numeral 3 denotes a control unit.

The object F to be treated in this embodiment has a substantially cylindrical shape, such as a fan cover of an aircraft engine. The fan cover has an outer shape of, for example, 1 to 2 m, and has a surface layer (coating layer) for abrasion resistance or the like formed on the inner surface Fa. This coating layer is formed, for example, by spraying a ceramic material on the inner surface Fa. Further, although the fan cover has a substantially cylindrical shape, its cross-sectional shape is not a perfect circle but is often in a distorted state such as an ellipse.

The table 1 is installed at the bottom in the working chamber 10 and is configured to be rotated about a rotation axis p by a driving means 11. Further, as shown in FIG. 2, in the table 1, the mounting portion 12 on which the separation target F is mounted has a substantially cross shape. The support 13 provided on the mounting portion 12 is for holding the peeling target F. When the peeling target F is mounted on the table 1, the support 13 is provided at a plurality of locations on the inner surface Fa of the peeling target F (see FIG. (Here, four locations) are pressed in the outer peripheral direction. Further, even when the outer diameter of each of the separation target objects F to be processed is different, the support 13 is arranged in the radial direction of the table 1 so as to hold the separation target object F arbitrarily within a predetermined range. It is movably supported. Further, the supporters 13 have a mechanism in which the supporters 13 are linked so that the distances from the rotation axis p to the pressing surface 13a are all equal. Accordingly, when the peeling object F is mounted on the table 1 and the inner surface Fa is pressed by the support 13, the center of the loaded peeling object F and the rotation axis p are substantially at the same position. I have. Further, the driving means 11 of the table 1 includes an encoder (not shown) for outputting a pulse of the rotation state of the table 1 to the control means 3.

The arm 2 is a multi-joint arm extending downward from above the working chamber 10 and having a plurality of degrees of freedom, and includes a driving means 20 for operating each joint 2a, and a high-pressure supply for supplying high-pressure water. The apparatus includes a water supply unit 21, a nozzle 22 connected to the tip of the arm 2, and a detection mechanism 23 provided near the tip of the arm 2 for distance detection.

The arm 2 is configured such that the nozzle 22 is arranged at an arbitrary position by operating each joint 2a. When performing the peeling process, the arm 2 moves the nozzle 22 in a horizontal direction such as the directions of arrows X1 and X2 in the drawing with the outlet of the nozzle 22 facing the inner side Fa of the peeling target F. Alternatively, it is possible to freely move the nozzle 22 in the vertical direction such as the directions of arrows Y1 and Y2 in the figure while keeping the distance d1 (ejection distance) between the nozzle 22 and the separation target F substantially constant. Has become. The drive means 20 of the arm 2 outputs the current position of the nozzle 22 to the control means 3.

The high-pressure water supply means 21 has a structure in which water is continuously supplied into the arm 2 and jetted from the nozzle 22 at the tip of the arm 2 at a pressure of, for example, 200 to 500 MPa. In the high-pressure water supply means 21, the ejection pressure can be arbitrarily set within a predetermined range, and each of the pipes and the pipe control devices of the high-pressure water supply means 21 has a structure capable of withstanding the set maximum pressure. . The high-pressure water supply means 21
Outputs the state of water supply such as the jet pressure to the control means 3.

The nozzle 22 has a structure for ejecting the water supplied by the high-pressure water supply means 21 at the above-described pressure, and has a blow-off port so that the ejected water efficiently separates the surface layer of the separation object F. Such shapes are designed. The ejection distance d1 from the nozzle 22 to the separation target F is a predetermined interval such as 15 mm, for example, which efficiently separates the surface layer of the separation target F. In the present embodiment, the surface layer separation processing is performed. In this case, the value is always substantially constant as described later.

The detection mechanism 23 is attached to the tip of the arm 2 so as to move with the nozzle 22, and is arranged at substantially the same height as the nozzle 22. Also, as shown in FIG.
The detection mechanism 23 is arranged to detect a point Fa1 shifted from the separation point 40 where the high-pressure water ejected from the nozzle 22 hits. This point Fa1 is located at a position where the object F to be peeled is rotated in the direction of arrow h in the figure to move to a peeling point 40 where high-pressure water from the nozzle 22 hits later.
Further, the position is such that water spouted and scattered from the nozzle 22 does not hinder detection. Further, the detection mechanism 23 outputs a detection result to the control means 3.
The control means 3 converts the distance (detection distance) d2 of the separation target object F detected by the detection mechanism 23 into the ejection distance d1 between the nozzle 22 and the separation target object F. That is, the detection mechanism 23
Is to detect in advance the distance between the location Fa1 and the nozzle 22 for the separation location 40 where the high-pressure water of the nozzle 22 will be hit later.

The detecting mechanism 23 detects a distance from the object F to be peeled, and is, for example, a laser detecting mechanism. Further, the detection mechanism 23 is a mechanism provided with a cover or the like so that the jetted and scattered water does not affect the detection. Further, the detection mechanism 23 is configured to calibrate the detection mechanism 23 at a reference position (not shown) provided inside the working chamber 10.

The control means 3 controls the rotation state of the table 1 sent from the drive means 11, the current position of the nozzle 22 sent from the drive means 20, and the result detected by the detection mechanism 23 from the high-pressure water supply means 21. And the driving means 11
, The driving means 20 and the high-pressure water supply means 21 are respectively controlled.

The control means 3 sets the use conditions of the nozzle 22 based on the detection result of the detection mechanism 23. Here, the control means 3 controls the driving means 20 to move the nozzle 22 so that the nozzle 22 and the object F to be separated keep a substantially constant distance. That is, the control means 3 calculates the rotation amount per pulse of the table 1, the ejection distance d1 as a reference, and the detection distance d2.
Is given in advance, and based on the rotation state of the table 1 and the detection result of the detection distance d2, the location Fa1 is
The setting is made to control the driving means 20 so as to keep the ejection distance d1 when moving to 0 substantially constant.

Next, the operation of the high-pressure water jetting device thus constructed will be described with reference to FIGS.
The main shape and dimensions such as the inner diameter of the separation target F to be processed here are input to the control means 3 in advance. Further, the separation target object F is mounted and held on the table 1 before the separation processing. It is assumed that the calibration of the distance detected by the detection mechanism 23, the calibration of the position of the arm 2, and the like have already been performed.

In FIG. 2, first, the arm 2 is driven to move the nozzle 22 to a position where the detection mechanism 23 can detect the object F to be peeled, for example, by a manual operation. When detecting the distance to the separation target F, the detection mechanism 23 outputs the detection result to the control unit 3.

Subsequently, the table 1 is moved in the direction of the arrow h in the figure.
For example, it is rotated at 5 rpm. At this time, the rotation state such as the rotation speed of the table 1 is output as a pulse from the encoder of the driving unit 11 to the control unit 3. When the table 1 starts rotating, the nozzle 22 moves to the inner surface Fa of the object F to be peeled.
And relative movement. Thereafter, the high-pressure water supply means 21 supplies water to the arm 2 to eject high-pressure water having a predetermined ejection pressure, for example, 200 to 500 MPa from the nozzle 22. The jetted high-pressure water hits the peeling point 40 on the inner surface Fa, and the coating layer at the peeling point 40 is continuously peeled off by the action of water pressure or the like.

At this time, the detecting mechanism 23 always detects the distance to the object F to be peeled, and the control means 3
The use condition of the nozzle 22 is set from the detection result of the above. Here, the detecting mechanism 23 detects the position F shifted from the peeling position 40.
a1 is detected. This location Fa1 is a location (separation location 40) where the high-pressure water of the nozzle 22 is later hit by the rotation of the table 1 in the direction of the arrow h in the figure.
Outputs the detected distance d2 to the control means 3. The control means 3 controls the arm 2 so that the ejection distance d1 when the location Fa1 moves to the separation location 40 is kept substantially constant from the rotation state of the table 1 and the detection distance d2 detected by the detection mechanism 23. Of the driving means 20 is controlled.

That is, when the detected distance d2 is larger than a predetermined value which is input in advance, the control means 3 determines that the ejection distance d1 between the nozzle 22 and the point Fa1 rotated to the separation point 40 becomes a predetermined value. Like arm 2
Is driven to move the nozzle 22 in the direction of the arrow X1 in the drawing to approach the separation target object F. Conversely, if the detection distance d2 at which the detection mechanism 23 has detected the point Fa1 is smaller than a predetermined value, the control means 3 drives the arm 2 to move the nozzle 22 in the direction of the arrow X2 in the figure. Object F to be peeled
Is continuously rotated, the control is continuously performed, and the ejection distance d1 is always kept substantially constant.

The control means 3 drives the arm 2 to gradually move the nozzle 22 in the vertical direction (the directions of arrows Y1 and Y2 in FIG. 1). For example, the nozzle 22 gradually moves upward (in the direction of the arrow Y1 in the figure) from the central portion to the upper end of the peeling target F, whereby the coating layer substantially in the upper half of the inner surface Fa is peeled off. Then, the coating layer is peeled over the entire inner surface Fa of the peeling target F by changing the mounting state of the peeling target F up and down and performing the same operation as described above.

As described above, the high-pressure water jetting apparatus according to the present embodiment can control the control means even when the distance between the nozzle 22 and the separation target F changes due to the distortion of the separation target F or the like. 3 moves the nozzle 22 so that the ejection distance d1 between the nozzle 22 and the separation target F is kept substantially constant, so that the coating layer can be uniformly separated at the separation portion 40. Further, since the distance is detected in advance by the detection mechanism 23 with respect to the exfoliated portion 40 which is hit with the high-pressure water, the jetted and scattered water hardly interferes with the detection, and the control means 3 determines that the jetted distance d1 is substantially constant. The nozzle 22 is made to continuously follow the rotation of the table 1 so as to maintain the distance, and the coating layer can be peeled off continuously and uniformly.

The control means 3 of the present embodiment sets the distance between the nozzle 22 and the peeling point 40 based on the distance from the point Fa1 detected by the detection mechanism 23.
Other usage conditions may be set. Other usage conditions of the nozzle 22 are factors that change the peeling state of the coating layer, and include, for example, the pressure and flow rate of high-pressure water jetting or the relative speed (table between the nozzle 22 and the peeling target F). 1 rotation speed). Further, the control means 3 of the present embodiment moves the nozzle 22 in order to keep the nozzle 22 and the object F to be peeled substantially constant, but moves the table 1 which is movable in the horizontal direction. You may.

Although the detecting mechanism 23 previously detects a portion Fa1 which is later deviated from the peeling portion 40 which is hit with high-pressure water, if the high-pressure water squirted and scattered does not affect the detection, Alternatively, a position near the peeling portion 40 may be detected. In this case, the control by the control unit 3 can be easily performed. Further, the detection mechanism 23 detects the position Fa shifted in the rotation direction from the peeling position 40, but includes the detection mechanism 23 that detects the position shifted in the vertical direction. May be configured so as to be easily adaptable.

Further, the detection mechanism 23 is not limited to a laser sensor, but may be any as long as it can relatively detect a change in distance, for example, a contact type distance sensor. Alternatively, the detection mechanism 23 may be a limited reflection type sensor that responds only to a predetermined distance. When using this limited reflection type sensor, a plurality of limited reflection type sensors having different reaction distances are arranged toward the peeling target F in accordance with the range of the desired ejection distance d1,
Within the range of the distance to which each sensor responds, the nozzle 22
Is controlled so as to be held.

Further, the detection mechanism 23 shown in this embodiment
The method of measuring the distance between the nozzle 22 and the target object over the entire inner surface Fa or over a predetermined region before the high-pressure water is jetted may be used. In other words, this method uses the detection mechanism 23 to detect the inner surface Fa
The control means 3 stores the measurement result as information, and sets the position of the nozzle 22 at the time of jetting the high-pressure water based on the stored information.
In this method, since the detection is performed when the high-pressure water is not jetted, there is almost no possibility that the jetted and scattered high-pressure water affects the detection.

The high-pressure water jetting device of the present invention is also applicable to a case where the object F to be peeled is not substantially cylindrical. In this case, the nozzle 22 is peeled without rotating the object F to be peeled. The object F is moved in the plane direction.

[0031]

As described above, in the high-pressure water jetting device according to the first aspect, even when the distance between the nozzle and the object changes, the use condition of the nozzle suitable for peeling the surface layer is controlled. Since the setting is made by the means, the surface layer of the object can be uniformly peeled.

In the high-pressure water jet device according to the second aspect, the control means moves one of the nozzle and the object based on the detection result of the distance between the nozzle and the object by the detection mechanism, and the nozzle and the object are moved. Since the distance from the object is maintained at a substantially constant distance suitable for peeling, a state suitable for peeling the surface layer is maintained, and uniform peeling of the surface layer can be easily performed.

In the high-pressure water jetting device according to the third aspect, the distance from the nozzle to the high-pressure water of the nozzle is detected in advance at a location where the high-pressure water hits the nozzle. The use condition of the nozzle can be set by the control means while reliably following the relative movement between the mechanism and the object.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a high-pressure water jetting device according to the present invention.

FIG. 2 is a sectional view taken along line AA in FIG.

[Explanation of symbols]

 F Object to be peeled (object) 1 Table 2 Arm 3 Control means 22 Nozzle 23 Detection mechanism

Claims (3)

[Claims] 1. A high pressure water is jetted from a nozzle (22) moving relatively to an object (F) to the object (F) to continuously peel off the surface layer of the object (F). A high-pressure water ejection device, comprising: a detection mechanism (23) for detecting a distance from the nozzle (22) to the object (F); and use of the nozzle (22) based on a detection result of the detection mechanism (23). And a control means (3) for setting conditions. 2. The control means (3) comprises:
2. The high pressure according to claim 1, wherein at least one of the nozzle (22) and the object (F) is moved so as to maintain a substantially constant distance between 2) and the object (F). 3. Water spouting device. 3. The nozzle according to claim 1, wherein said detecting mechanism detects in advance a distance between said nozzle and said nozzle at a position where said nozzle is exposed to high-pressure water. 2. The high-pressure water jet device according to 2.