JP2597382B2 - Device cutting control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cutting apparatus which uses a pressurized fluid jet such as an water jet or an abrasive jet and which is close to a member to be processed. The present invention relates to a cutting control device for a member provided with a processing head for performing a drilling or cutting operation in a set state.

[Related Art] For example, as a means for cutting a plate material such as an iron material, an apparatus using high-pressure fluid injection such as water is known. The pressurizing apparatus using the high-pressure fluid jet includes a processing head by a nose that jets water or an abrasive jet in which an abrasive is appropriately mixed with the water. Is set sufficiently close to a work such as an iron plate to be processed, and in this state, high-pressure fluid is sprayed onto the work surface.

In such a pressurizing device, it is required that the distance between the processing head and the work is always accurately measured so that the distance between the head and the work is accurately set. For this reason, a distance detecting sensor mechanism which is moved in the direction of the work integrally with the processing head so as to approach the processing head is provided. This sensor mechanism is attached and set at a position as close as possible to the processing head. However, it is impossible to measure the inter-work distance substantially at the same position as the processing position by the processing head. When the distance between the processing head and the sensor mechanism is L, the distance between the work and the sensor mechanism at a distance L from the processing position of the work surface by the processing head is measured.

The distance control of the processing head from the work using the sensor mechanism is effective only when it is guaranteed that the work always exists in the distance measurement direction of the sensor mechanism. If the workpiece does not exist in the distance measurement direction of the sensor mechanism and the workpiece exists in the processing head, the head is moved until the processing head collides with the workpiece.

In the case where a plurality of parts are actually cut efficiently from a single material and taken out, the remaining portion to be cut is gradually reduced, and it is often not guaranteed that a work exists in a portion corresponding to the sensor mechanism. .

For example, as shown in FIG. 4, in a state where an opening 12 obtained by cutting a first part is present in a work 11, an attempt is made to cut a third part from the work 11 according to a frame 13 as indicated by an arrow. In this case, the processing head 14 is first set to the point A. In this state, the sensor 15 that is set integrally with the head 14 is set on the work 11 that is deviated from the position of the opening 12, so that the sensor 15
The work of cutting the work 11 is progressed by the head 14 while observing the distance to the work 11. However, when the cutting operation proceeds and the processing head 14 reaches the point B, the sensor 15 is opened.
When the sensor 11 reaches the position 12 and the work 11 does not exist in the distance detection direction of the sensor 15, that is,
The distance is larger than the distance between the head and the head 14, and in an extreme case, the distance is infinite. For this reason, the processing head 14 is moved in the direction of the work 11 and collides with the work 11, making it impossible to continue the cutting operation thereafter.

Similarly, when the cutting direction is set in a direction intersecting the edge line of the workpiece 11 as shown in FIG. 5, a normal cutting operation proceeds from the point A, but reaches the point B and the sensor 15 When the projections protrude from the edge line of the work 11, the processing head 14 starts to descend. Further, as shown in FIG. 6, when cutting at a position close to the edge line of the workpiece 11 in parallel with the edge line, the distance between the processing head 14 and the workpiece 11 is measured by the sensor 15 from the beginning. Can not do it.

[Problems to be Solved by the Invention] The present invention has been made in view of the above-described points. For example, when a member is cut by a processing head such as a nozzle that performs processing by high-pressure fluid injection, this processing is performed. The distance between the processing head and the workpiece to be processed is accurately set so that the cutting process can proceed, and in particular, the state where the workpiece does not exist in a portion corresponding to the sensor mechanism for measuring the distance is provided. Even if there is, it is an object to provide a cutting control device for a member that allows a cutting operation to proceed smoothly.

[Means for Solving the Problems] In a member cutting control device according to the present invention, a sensor mechanism for measuring a distance to a workpiece is set on a side of a processing head such as a nozzle for performing high-pressure fluid injection. And a means for moving the head and the sensor mechanism integrally so as to approach in the direction of the work. Based on the drawing information corresponding to the work and the pressing position thereof, the distance of the sensor mechanism is determined. A state in which no workpiece exists in the measurement direction is determined, and in this state, a detection signal of a large distance from the sensor mechanism is invalidated.

[Operation] In the cutting control device configured as described above, for example, the state in which the work does not exist in the distance detection direction of the sensor mechanism based on the drawing processing position is reliably determined based on the drawing information, In this state, the detection signal from the sensor mechanism is invalidated. Therefore, even when the workpiece does not exist in the portion corresponding to the sensor mechanism and a substantially large distance is measured, this distance information is not transmitted to the moving mechanism of the processing head, and the processing head is Will be moved in the direction and will not collide. In this case, the detection signal in a state where the distance between the sensor mechanism and the work is small can be used as it is, and when an obstacle or the like is detected, or when the work is present again in a portion corresponding to the sensor mechanism, The distance between the processing head and the workpiece is set and controlled.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the basic configuration, and includes a sensor 21 for measuring the distance to a work and outputting the distance information. The detection signal from the sensor 21 is supplied to a comparator 23 after being appropriately amplified by an amplifier 22.

The comparator 23 compares the upper limit information and the lower limit information from the upper and lower limit setting circuit 24 with each other, and determines that the detected distance information from the sensor 21 is larger than the upper limit, that is, that the position of the sensor 21 is sufficiently far from the workpiece. When this is done, a "far" signal is output. When the distance between the sensor 21 and the workpiece is smaller than the set lower limit,
A “near” signal is output from this comparator 23.

The “near” and “far” signals from the comparator 23 are supplied to an up / down command circuit 25 for the processing head. The command circuit 25 outputs an “up” command when a “near” signal is input, and a “down” command when a “far” signal is input. Are supplied to input 1 “IN1” and input 2 “IN2” of the controller 26, respectively. In this controller 26, corresponding to the above input 1 or 2,
Elevation control for driving the processing head in a direction to separate from the work, or descent control for bringing the processing head close to the work is executed.

The controller 26 further includes a drawing information setting circuit 27.
Is supplied with the drawing information. In the drawing information setting circuit 27, information such as a shape of a workpiece to be cut, a shape position of an already cut opening or the like, and a figure to be processed and cut from now on is set by an operator or the like as appropriate. I have.

In the controller 26, although not shown in detail in this figure, information on the cutting position corresponding to the shape of the work and the like is set corresponding to the actual work. And
In response to the cut graphic information, a command is also issued to move the processing head on a surface corresponding to the plane of the work and to move the processing head to the cutting position.

Therefore, the controller 26 determines whether or not a workpiece exists below the distance detection direction of the sensor 21 in accordance with the position of the processing head. Alternatively, it outputs an invalid determination signal. This determination signal is supplied to the ascending / machining command circuit 25, and when the invalidation determination signal is supplied, the "far" signal supplied from the comparator 23 is invalidated. In this case, the "near" signal is set to a valid state, and when the sensor 21 detects a state close to a workpiece or the like, the processing head is raised.

FIG. 2 shows a cutting apparatus in which a nozzle 30 for jetting an abrasive jet is used as a processing head. The cutting apparatus is located at a position close to the side of the nozzle 30, for example, a distance L away. The sensor 21 is set at the position.
The sensor 21 and the nozzle 30 are configured to be integrally moved in parallel with the surface of the work 11, and are basically integrally moved in a direction approaching the work 11 or in a direction away from the work 11. In the vertical direction. Here, the sensor 21 is moved upward separately from the nozzle 30 as necessary.
In a state where the processing is set to a position suitable for processing the 11, it is also possible to control such that only the sensor 21 is raised and set to the retracted position.

In a state where the detection surface of the sensor 21 and the tip of the nozzle 30 match as shown in this figure, the distance l between the sensor 21 and the surface of the workpiece 11 measured by the sensor 21 is
The nozzle 30 is set at a position suitable for cutting the work 11 by the injection of the abrasive jet based on the information of the measured distance l.

FIG. 3 shows a flow of control processing in the above-described cutting apparatus.
0 and the sensor 21 are set to move to a predetermined position on the surface of the work 11 to be cut.

When the nozzle 30 and the sensor 21 have been moved to the predetermined positions in this way, the nozzle 30 and the sensor 21 are integrally lowered in step 101 so as to approach the work 11. This lowering operation is performed by the sensor 21
The distance between the nozzle 30 and the work 11 is set to a predetermined value or less when the distance between the nozzle 30 and the work 11 is set at a high speed when the distance between the nozzle 30 and the work 11 is large. , The descending speed is switched to a low speed.

This lowering operation is performed by a distance (for example, 2 m) that is suitable for the nozzle 30 to process the workpiece 11 by jetting the abrasive jet.
m), and is stopped in a state where a suitable interval for processing in step 103 is set. Then, in step 104, only the sensor 21 is raised.

When cutting the work 11, the nozzle 30 must first be
At the same time, the nozzle 30 is set to a processing start position on the workpiece 11 and the nozzle 30 is lowered to a position close to the surface of the workpiece 11 at this position. In this state, since there is no cut portion in the work 11 yet, first, a through hole is formed in the work 11 by abrasive jet injection from the nozzle 30. When such a through hole is formed, the abrasive jet ejected from the nozzle 30 is reflected on the surface of the workpiece 11 and
The abrasive or the like mixed in the water collides with the detection surface of. Therefore, in a state where the sensor 21 is close to the work 11 together with the nozzle 30, the detection surface of the sensor 21 is damaged. Therefore, only the sensor 21 is raised as in step 104.

In step 105, an abrasive jet is jetted from the nozzle 30 to make a hole in the work 11, and the jet of the abrasive jet is checked in step 106 to determine whether or not the abrasive jet has penetrated the work 11. It is executed while monitoring. In this step 106, for example, a water surface or the like is set on the back side of the work 11, and the abrasive jet
This is performed by electrically detecting the turbulence of the water surface that occurs when the water passes through 11. Also, as a simple means, the time required for penetration that can be known empirically is set in a timer, and the elapsed time from the start of injection of the abrasive jet is measured by this timer to determine the penetration. Is also good.

If it is detected in step 106 that the sensor 21 has penetrated, the process proceeds to step 107, where the sensor 21
Is lowered to the position corresponding to the position of the nozzle 30, and the nozzle
The interval between 30 and the work 11 can be measured by the sensor 21.

In step 108, based on the drawing information and the position information of the sensor 21, it is determined whether or not the position corresponds to the edge portion of the workpiece 11 or the opened hole portion. And
If it is determined that it is an edge or an opening portion, the process proceeds to step 109, where the descending signal of the nozzle 30 is cut, that is, the "far" signal given from the comparator 23 to the ascending / descending command circuit 25 in FIG. To

That is, when it is determined in step 106 that a through-hole is formed, or when the sensor 21 is lowered in step 107, if the workpiece 11 does not exist below the sensor 21, the sensor 21 Signal cannot be measured. Therefore, the nozzle in such a state
The downward movement of the nozzle 30 is prohibited, and the collision of the nozzle 30 with the workpiece 11 is prevented.

In this way, the lowering of the nozzle 30 is prohibited, and the step
With the nozzle 30 set at the position determined in 103,
Proceed to step 110. The process proceeds to step 110 in the state where it is confirmed in step 108 that the work 11 exists below the sensor 21.

In step 110, the nozzle 30 is moved along the line to cut the work 11, and the work of cutting the work 11 is executed by abrasive jetting from the nozzle 30. In this case, in a state where the work 11 exists below the sensor 21, the height of the nozzle 30 is controlled based on a detection signal from the sensor 21, and when the work 11 does not exist below the sensor 21, The cutting process is continued at the height set in step 103 without moving the nozzle 30 in the vertical direction. When the sensor 21 detects that the nozzle 30 is too close to the workpiece 11, the “near” signal from the sensor 21 is not invalidated, so that the nozzle 30 is controlled to rise to an appropriate position.

In step 111, it is determined whether or not the cutting work of the workpiece 11 has been completed. If the cutting has not been completed, the descending signal of the nozzle 30 is returned in step 112, that is, the "far" Enable the signal and return to step 108.

If the completion of cutting is confirmed in step 111, the process proceeds to step 113, in which the nozzle 30 and the sensor 21 are raised. In step 113, the completion of machining is confirmed, and this processing ends.

[Effects of the Invention] As described above, according to the cutting control device of the present invention,
A sensor mechanism that measures the height from the work surface is provided integrally with a processing head such as a nozzle that performs high-pressure fluid injection,
When cutting is performed while measuring the distance between the processing head and the work surface using this sensor mechanism, the processing head remains in the state where no work exists in the portion corresponding to the detection surface of the sensor mechanism. Unnecessary lowering is performed, and the programmed cutting is performed safely and reliably.

[Brief description of the drawings]

FIG. 1 is a configuration diagram for explaining a member cutting control device according to the present invention, FIG. 2 is a diagram showing a cutting mechanism portion of the cutting device taken out, and FIG. 3 is control of a cutting operation of the cutting control device. 4 to 6 are flow charts for explaining the flow of FIG.
The figures are diagrams for explaining problems in this type of conventional cutting apparatus. 11 ... Work, 21 ... Sensor, 23 ... Comparator, 24
…… Upper and lower limit setting circuit, 25 …… Up / down command circuit, 26…
... Controller, 27 ... Drawing information setting circuit.

Claims (1)

(57) [Claims] 1. A cutting head for performing a cutting operation on a member to be cut in a state set close to a processing surface of a member to be cut, and a head for moving the cutting head close to or away from a processing surface of the member. Means for moving in the direction in which the object is moved, and the object is set so as to be close to the side of the processing head, and is set so as to move integrally with the head in a direction approaching or moving away from the object. A sensor mechanism for detecting a distance, means for determining a state in which no object exists in a distance detection direction of the sensor mechanism based on drawing information corresponding to a shape of the object and a processing position of the object; Means for invalidating distance information of a large distance detected by the sensor mechanism in a state where it is determined that no object exists in the distance detection direction, wherein the distance information is invalidated. In this state, the distance between the processing head and the object to be processed is appropriately set close to each other based on the distance information detected by the sensor mechanism, and the processing of the object is performed by the processing head. A member cutting control device characterized by the above-mentioned.