JPH0342147B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an automatic beveling method for a three-dimensional curved surface, and particularly for a plastically worked spherical head plate.
The present invention relates to an automatic groove processing method suitable for cutting a welding groove portion of a nozzle hole with uneven thickness where the plate thickness differs at each location.

[Prior art]

The end plate of a pressure vessel or the like has a three-dimensional curved surface, and since it is generally plastically worked, there are large errors in shape and plate thickness with respect to drawing dimensions, and it is difficult to obtain uniform processing accuracy. Therefore, it is very difficult to automate secondary processing after plastic working, such as cutting of a welding groove for a nozzle hole.

Conventionally, bevel cutting has generally been performed manually or by semi-automatic gas or plasma cutting, or by cutting with a machining allowance and then processing with a machine tool.

By the way, in order to automate the bevel cutting process of the unevenly thick nozzle hole (the nozzle hole where the thickness of the cut part is not uniform) of the end plate after plastic working as shown in Fig. 1,
As shown in FIG. 2, the tip of the cutting torch 13 is controlled at a predetermined angle θ (perpendicular to the vertical line) with respect to the workpiece 19, and maintained at a constant height a, and then at a point on the extended line. In order to keep P always at a constant height b,
It is necessary to obtain a predetermined groove shape by moving along a constant trajectory that follows the curved shape of the workpiece 19 while correcting the machining depth (plate thickness measurement values T ₁ , T ₂ −b).

In this case, it is possible to change the torch tip to a predetermined angle θ and control the moving trajectory to be constant, but the curved shape and plate thickness of the workpiece may vary individually or depending on the part. If it is uniform, the distance between the torch tip and the workpiece surface will fluctuate, making it impossible to obtain a predetermined groove shape.

Due to the above-mentioned problems, automatic processing equipment for cutting the bevel of a workpiece such as a head plate, which is a plastically processed product, has not been put into practical use.

[Purpose of the invention]

In order to solve the above-mentioned problems, the present invention always maintains the distance between the tip of a processing device such as a cutting torch and the surface to be processed and the thickness of the workpiece, even if the workpiece is not processed according to the specifications. The purpose is to hold a torch that can obtain a constant groove shape, and to automatically move the tip of the processing device along the end plate (three-dimensional curved shape) of the workpiece according to the dimensions. It is something.

[Summary of the invention]

The present invention sets an initial numerical value according to the drawing dimensions of the processed part of the end plate in a control device, and controls the position of the processed part of the end plate using the initial numerical value using a measuring device having position measurement and plate thickness measurement functions. The measured values are input into the control device and compared with the initial values to automatically correct the shape and thickness errors.The corrected values control the processing equipment. The tip automatically moves along the machined part of the head plate while maintaining a constant distance from the machined part of the head plate, and automatically adjusts the machining depth according to changes in plate thickness. It is characterized by being processed.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4. 1 is a column, 2 is a frame fixed to the column 1, and a head 3 is attached to the frame 2 so as to be slidable in the left-right direction (Y direction) by a head drive motor 4 attached to the frame 2. 5 is a hollow main shaft attached to the head 3 so as to be moved in the vertical direction (Z direction) by a main shaft drive motor 6; 7 is an arm provided at the bottom of the main shaft 5; The angle can be changed in the direction of the arrow α by the driving force transmitted through the shaft, and the angle can be changed in the direction of the arrow β by the drive motor 9. 10 is a torch arm drive motor 1 attached to the arm 7;
Reference numeral 1 indicates a torch arm that is slidable in the rotation radius direction (δ direction) of the arm 7; reference numerals 12 and 13 indicate a measuring terminal and a cutting torch, respectively, which are installed at the tip of the torch arm 10 for each operation; and reference numeral 14 indicates a rotary table drive. A rotary table that can be rotated to a predetermined angle by a motor 15, 16 a drive system control device using numerical control for controlling the head drive motor 4, main shaft drive motor 6, and drive motors 8, 9, and 11; 17 a drive system control device 16 is a control device that performs program control; 18 is an operation panel that inputs data to the control device 17 and controls the rotary table drive motor 15;
19 is a workpiece.

Next, the operation of the present apparatus will be explained by taking as an example the beveling of a nozzle hole in the workpiece 19.

(1) Display the drawing dimensions of the nozzle hole, which is the location to be machined, on the operation panel 18, and send it to the control device 17 via the operation panel 18.
Enter.

(2) The rotary table 14 is driven by the rotary table drive motor 15 based on the rotation command from the operation panel 18, and rotates the workpiece 19 placed at the reference position in advance according to the scale on the rotary table 14, and rotates the workpiece 19 placed at the reference position. The center of the hole is made to coincide with the center line of the main shaft 5 in the left-right direction.

(3) The head drive motor 4, main shaft drive motor 6, drive motors 8, 9, and 11 are driven in accordance with the output signal of the drive system control device 16 that is programmed via the control device 17, and the arm 7 is driven in accordance with the arrow shown in the figure. Up and down direction, left and right movement and angle,
The rotation is controlled, its center is set at the center position of the nozzle hole as programmed, the torch arm 10 is also set at a predetermined radius, and the arm 7 itself rotates.

(4) There is a measurement terminal 12 at the tip of the torch arm 10.
is installed, and the shape measurement and plate thickness measurement of the processed area are automatically performed under the control described in (3) above. Then, a signal is fed back from the measurement terminal 12 to the control device 17, and comparison and correction between the specified dimension and the measured value are automatically performed.

(5) The numerical values modified as described above are input into the program from the control device 17 to the drive system control device 16 as secondary commands. And drive system control device 1
In accordance with the output signal 6, the head drive motor 4, the main shaft drive motor 6, and the drive motors 9 and 11 are driven by numerical control. Therefore, measurement terminal 1
2 is replaced with the cutting torch 13, the tip of the cutting torch 13 maintains a constant distance from the workpiece 19, and the torch arm 10 changes in the direction of the rotation radius (γ direction), allowing the cutting torch 13 to cut the plate. The nozzle hole is beveled by automatically traveling along the surface to be processed while automatically changing the processing depth according to changes in thickness.

As described above, according to the above embodiment, this device can create a program for bevel processing by simply inputting the predetermined drawing dimensions, and can automatically perform measurement and processing. Accuracy is also improved, which has a ripple effect on subsequent processes.

〔Effect of the invention〕

According to the present invention, the tip of the processing device can be automatically moved along the end plate (three-dimensional curved shape) of the workpiece according to the dimensions, and the processing depth can be adjusted according to changes in the plate thickness. It has the advantage that it can be changed automatically and the desired groove shape can always be obtained.

[Brief explanation of drawings]

Fig. 1 is a front view of an example of a workpiece to be processed by the present invention, Fig. 2 is an explanatory diagram showing the relationship between the torch, the torch arm, and the workpiece surface, and Fig. 3 is an embodiment of the apparatus of the present invention. FIG. 4 is a flowchart of the present invention. 1...Column, 2...Frame, 3...Head, 4...Head drive motor, 5...Main shaft, 6...
... Main shaft drive motor, 7 ... Arm, 9 ... Drive motor, 8 ... Drive motor, 10 ... Torch arm, 11 ... Torch arm drive motor, 12 ...
...Measurement terminal, 13...Cutting torch, 14...Rotary table, 15...Rotary table drive motor, 1
6... Drive system control device, 17... Control device, 18
...Operation panel, 19...Workpiece.

Claims (1)

[Claims] 1. Set initial values according to the drawing dimensions of the processed portion of the head plate in the control device, and control a measuring device having position measurement and plate thickness measurement functions using the initial values,
The position and plate thickness of the machined part of the end plate are automatically measured, the measured values are input into the control device, and compared with the initial values, the shape and thickness errors are automatically corrected, and the processing equipment uses the corrected values. The tip of the processing device maintains a constant distance from the processing location on the end plate, and automatically moves along the processing location on the end plate while automatically adjusting the processing depth according to changes in plate thickness. An automatic beveling method for a head plate characterized by beveling a hole.