JPS63207471A - Bevel cutting method - Google Patents

Abstract

PURPOSE:To easily and automatically cut a bevel by making the face to be cut movable in three dimensional direction and supporting pivotally a cutting torch rotatably on the vertical shaft movable in the vertical axial direction. CONSTITUTION:A torch 1 is inclined at a specific angle (inclination alpha) along the slope line direction of a cutting end face for a vertical shaft 2 with an axial fulcrum C as the center to set a bevel angle. The vertical shaft 2 is moved (movement amt. T) in the slope line of the cutting end face of the material to be worked by using X-Y coordinate system to set the beveling amt. and the vertical shaft 2 is lifted in a Z axial direction to set proper torch intervals as well. After completion of the arrangement or prior to the arrangement the moving line forming by offsetting by the moving amt. T in the slope line direction of the vertical shaft 2 for the cutting end face contour line of the material to be worked and the turning angle of the vertical shaft 2 for keeping the cutting torch 1 on the slope line are found by calculation expression. Finally the vertical shaft 2 is kept on the slope line by displacing at specific angle by adequately rotating it while moving based on the X, Y coordinate values composing the moving line to effect the bevel cutting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bevel cutting method for forming a predetermined bevel shape on the end face of a workpiece using a gas torch, plasma torch, or other cutting torch. .

``Prior art'' As a pretreatment for welding a cut member such as a steel plate, the end face of the workpiece is cut into a Y shape, a Y shape, an X shape, etc., and a predetermined groove shape is provided. For bevel cutting of seeds, an NO cutting machine is generally used, and the vertical axis of the cutting machine is moved along the end face contour of the workpiece to perform the bevel cutting. A bevel cutting mechanism as shown in is used.

To briefly explain the configuration of such a bevel cutting mechanism, the beveling cutting mechanism includes a vertical shaft 12 that moves along the contour line P° of the cut end surface 10a of the workpiece 10, and a vertical shaft 12 that is attached to the vertical shaft 12 and that is attached to the vertical shaft 12 to perform cutting. The torch block 11 controls the position of the cutting torch 1'.
an arcuate arm 13 that angularly displaces the arcuate arm 13 about the reference point of the cut end surface 10a;
and a slide plate 14 that is moved in the normal direction.

Further, the vertical axis 12 is adjusted in accordance with the wall thickness of the workpiece.
It is configured to be movable up and down in the axial direction and rotatable about the axis of the vertical shaft 12.

According to this cutting mechanism, after aligning the axis of the vertical shaft 12 with the vertical line of the cut end surface 10a of the workpiece 10, the cutting torch 1° is angularly displaced along the arcuate arm 13, and the cutting torch 1 ' is set, and then the arcuate arm 13 is moved along the slide plate 14 by an amount corresponding to the amount of light opening.

After setting the torch interval by raising and lowering the vertical shaft 12 as appropriate, the vertical shaft 12 is rotationally displaced so that the 1° bevel direction of the cutting torch is always located in the normal direction, and the NG sub-control is applied. By moving the vertical shaft 12 along the end surface contour line P' of the workpiece 10, it is possible to perform bevel cutting on the cut end surface 10a of a desired shape.

"Problems to be Solved by the Invention" As described above, in the method of performing bevel cutting while moving the vertical shaft 12 of the cutting machine along the end face contour line P° of the workpiece 1o, the cutting torch l° In order to set the bevel angle, it is essential to provide an arcuate arm 13 that angularly displaces the torch in the normal direction around the cutting end surface 10a. Not only does it lead to an increase in the cost and size of the entire device because it is complicated to manufacture, but it is also necessary to set the displacement angle while moving (sliding) the cutting torch 1° along the guide hole of the arm 13. There has been a problem in that it is difficult to set an accurate bevel angle due to the 1° backlash or rocking of the guide hole and the cutting torch.

For this reason, various cutting methods for bevel cutting without using the arcuate arm 13 have been studied, but when the arcuate arm 13 is not used, the vertical axis 12 of the cutting machine is It was necessary to remove the angle and move it, and this caused the problem that it became impossible to cut the bevel using an NC cutting machine or a robot, and both were far from being practical.

In view of the drawbacks of the prior art, the present invention provides an arcuate arm 1
It is an object of the present invention to provide a bevel cutting method that allows bevel cutting to be easily and automatically performed using an NC cutting machine, a robot, etc. without using a third machine.

``Means for Solving the Problems'' In order to achieve such technical problems, the present invention has the following features as shown in FIG. Vertical axis 2 movable in direction (x-y)
and a cutting torch 1 that is pivotally supported by the vertical shaft 2 and can be tilted at a predetermined angle with respect to the vertical shaft 2; The groove amount is set by moving (movement amount T) in the normal direction of the cut end surface lea.

(2) The cutting torch 1 is tilted at a predetermined angle along the normal direction about the pivot point C to set the groove angle α.

In this case, the above-mentioned (1) and (2) may be set before or after.

■Next, before or during bevel cutting, offset the contour line P' of the cut end surface 10a of the workpiece 10 by a distance corresponding to the amount of movement T in the normal direction of the vertical axis 2. Movement formed by! The amount of rotation angle θ of the vertical axis 2 to maintain the IP and the cutting torch 1 on the normal line is determined by a calculation formula or the like.

■Finally, the cutting torch 1 is maintained on the normal line by moving the vertical shaft 2 along the movement line P and at the same time rotating and displacing the vertical shaft 2 by a predetermined angle according to the rotation angle θ amount. Bevel cutting is performed while

We propose a groove cutting method that requires this as an essential component.

"Effect" According to this technical means, in order to set the bevel angle by tilting the cutting torch 1 at a predetermined angle around an arbitrary pivot point C on the torch, for example, the configuration of such a beveling cutting device is has a vertical shaft 2 that is movable on the surface to be cut in at least two-dimensional directions (x-y), preferably in three-dimensional directions (x-y-z), and rotatable in two vertical axis directions. It is sufficient to rotatably support the cutting torch 1, and as a result, the arcuate arm 13, which is an essential component in the prior art, is not required, and the configuration of the bevel mechanism is greatly simplified, and the entire device is This leads to cost reduction and downsizing.

Furthermore, the bevel cutting device can be easily manufactured by simply modifying a part of a normal planar coordinate system cutting device, and the cutting device can also be used as a planar cutting device by keeping the cutting torch l vertically. It can be used for both purposes, is versatile, and extremely advantageous in terms of work efficiency.

In addition, the setting of the bevel angle is performed by rotating the cutting torch 1 around the fulcrum C.
This can be done by simply rotating the groove by a predetermined angle, making it easy and accurate to set the groove angle.

Furthermore, the technical means further comprises a vertical axis 2 located on the fulcrum C.
In order to perform bevel cutting while maintaining the cutting torch l on the normal line by a wheel that rotates and displaces it by a predetermined angle around the axis,
The cutting torch 1 is moved along the vertical axis along a movement line P formed by offsetting the contour line P° of the cut end surface 10a of the workpiece 1o by a distance corresponding to the movement amount T in the normal direction of the vertical axis 2. 2, accurate bevel cutting can be easily performed along the cutting end surface 10a.

That is, the main movement line P is the end face contour line P of the workpiece 10.

Since it is always added or subtracted by the amount of movement T in the normal direction to °, it can be calculated using a simple formula using trigonometric functions, and the formula can be stored in the control circuit of the NC cutting machine, robot, etc. If this is done, the groove can be easily and automatically cut simply by inputting the contour line P° data to the circuit.

"Embodiments" Hereinafter, preferred embodiments of the present invention will be described in detail by way of example with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment are not intended to limit the scope of the invention, but are merely illustrative examples. It's nothing more than that.

FIG. 1 shows a bevel cutting mechanism schematically showing the configuration of a beveling cutting mechanism according to an embodiment of the present invention, and l is a pivot supported rotatably about a vertical shaft 2 about an arbitrary pivot point C on the torch shaft. The cutting torch 1 is configured to be able to tilt at a predetermined angle about the pivot point C along a vertical plane passing through the normal to the cut end surface 10a of the workpiece IO.

The vertical shaft 2 is configured to be movable on the surface to be cut in at least two-dimensional directions (X-Y), preferably in three-dimensional directions (X-Y-Z) using a two-dimensional coordinate system or the like. It is configured to be rotatable at any angle about the axis of the vertical shaft 2.

Next, a groove cutting method using such a groove cutting mechanism will be explained.

B. First, the cutting torch l is tilted at a predetermined angle (inclination angle α) with respect to the vertical axis 2 about the fulcrum C along the normal direction of the cut end surface 10a to set the beveling angle.

mouth, and then the vertical axis 2 using an X-Y coordinate system (not shown).
is moved (movement amount T) in the normal direction of the cut end surface 10a of the workpiece 10 to set the groove amount, and the vertical axis 2 is moved to Z.
Set an appropriate torch interval 2 by raising and lowering it in the axial direction.

In this case, the amount of movement T can be easily determined using the following formula.

T= (t-R+z) tan a t: Thickness of the workpiece 10 R: Thickness of the remaining groove of the workpiece 10 C, the cut end surface of the workpiece 10 after or before the setup 10a A movement line P formed by offsetting the contour line P' by the movement amount T in the normal direction of the vertical shaft 2 and a rotation angle θ of the vertical shaft 2 to maintain the cutting torch 1 on the normal line.
The amount is calculated using the formula below.

θ= jan' (y/x)+ (π/2)X=
x+T*sin θ Y = y + T @cos θ θ: Rotation angle θ amount of vertical axis 2 X, Y: X-Y coordinate values of movement line P Finally, while moving the vertical shaft 2 based on the X and Y coordinate values that constitute the movement line P, the cutting torch 1 is moved by appropriately rotating and displacing the vertical shaft 2 by a predetermined angle θ. Bevel cutting is performed while maintaining the bevel on the normal line.

In this case, if the contour line P' of the cut end surface 10a of the workpiece 10 has a steep displacement point as shown in FIG. It is also possible to set up a program such that the cutting torch 1 is once pulled out of the area to be cut along the line, and then circled in an arc, and then introduced along the tangential direction of the movement line P after the displacement point. Yes, in this way, the cut end surface 1 of the workpiece lO
Bevel cutting can be performed freely without being limited to the shape of the contour line P° of 0a.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a beveling mechanism according to an embodiment of the present invention,
FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a schematic configuration diagram of a beveling mechanism according to the prior art. Figure 3

Claims (1)

[Claims] 1) A cutting device that performs bevel cutting while moving a cutting torch tilted at a predetermined angle in a two-dimensional direction in correspondence with the cut end surface of a workpiece, which is rotatable about an axis and a cutting torch that is pivotally supported by the vertical axis and can be tilted at a predetermined angle with respect to the vertical axis; After setting the bevel angle and bevel amount by tilting the cutting torch at a predetermined angle along the normal direction,
While moving the vertical axis along a movement line formed by offsetting the cut end surface contour by a distance corresponding to the amount of movement in the normal direction of the vertical axis, the vertical axis is simultaneously rotated by a predetermined angle. A bevel cutting method characterized by performing bevel cutting while maintaining the cutting torch on the normal line by