JP2816245B2 - Groove cutting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a groove cutting device mounted on a numerically controlled cutting machine for performing a groove cutting of a preset shape on a workpiece. Things.

<Conventional technology> A metal plate such as a steel plate or a stainless steel plate, or a synthetic resin plate,
2. Description of the Related Art A workpiece such as a non-metallic plate such as a plywood is cut by using a cutting torch such as a gas cutting torch, a plasma cutting torch, or a laser cutting torch. In particular, when the cutting torch is mounted on a numerically controlled cutting machine (NC cutting machine), the workpiece can be cut into a desired shape.

The cutting member cut from the metal plate may be welded to another member. In this case, so-called bevel cutting is performed in which the end surface of the cutting member is inclined and cut in accordance with the thickness of the metal plate, the joining portion, and the like.

When performing a bevel cutting on a cutting member, it is necessary to always incline the cutting torch in a normal direction with respect to a cutting portion of the cutting member and move the torch in a tangential direction.

For this purpose, a groove cutting device for performing groove cutting is equipped with a cutting torch on a carriage configured to be movable in two orthogonal directions, and the cutting torch is turned around the axis of the device by a turning device. The cutting torch is configured to be tiltable with respect to the pivot axis by an angle setting device, and the cutting torch is configured to be separated from the center of rotation to a predetermined position by a shift device.

The angle setting device and the shift device set the inclination angle of the cutting torch and set the outer shape of the cutting shape. For this reason, once the angle and position of the cutting torch are set at the start of the groove cutting, it is rare to drive the above-mentioned devices thereafter.

Each of the angle setting device and the shift device is provided with a drive motor including a pulse motor. The drive motor of the swing device is controlled by a numerical control device (NC device)
The cutting torch is turned so that the inclination direction of the cutting torch always becomes the normal direction with respect to the moving direction of the cutting torch. The drive motors of the angle setting device and the shift device are controlled by the auxiliary function device of the NC device, and set the cutting torch at a predetermined angle and position at the start of the groove cutting.

In the groove cutting device configured as described above, the angle setting motor and the shift motor are each disposed near the cutting torch, and are configured to be able to turn together with the cutting torch with the operation of the turning device. ing. The turning device is configured to be able to rotate in the same direction without any limitation. For this reason, the drive signals for the angle setting motor and the shift motor are configured to be transmitted from the auxiliary function device via a slip ring provided in the turning device.

<Problems to be Solved by the Invention> Recently, when cutting one shape, it is required to perform groove cutting having different angles in the shape. When performing such groove cutting, it is necessary to change the angle of the cutting torch and the separation position within a predetermined section along the cutting shape.

In the above-mentioned prior art, since the angle setting motor and the shift motor are arranged near the cutting torch, it is essential to transmit a drive signal for these motors via a slip ring.

However, it is difficult to transmit a weak current through the slip ring, and a servomotor that detects the amount of rotation of the motor with a resolver or a rotary encoder cannot be used as the angle setting motor and the shift motor. Therefore, it is impossible to change the angle of the cutting torch and shift the cutting torch while cutting the workpiece. Therefore, in order to meet the above demand, the angle and shift of the cutting torch are performed in a manner that does not control the position of the cutting torch, so that the cut surface is damaged, the groove shape is changed, or the cutting is performed. There is a problem that a dimensional error may occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide a groove cutting device capable of setting and shifting the angle of a cutting torch according to a preset groove shape while performing a cutting operation on a workpiece.

<Means for Solving the Problems> In order to solve the above-mentioned problems, a groove cutting device according to the present invention uses a shift motor to separate a cutting torch from a center of rotation by a shift motor and an angle setting motor. In a groove cutting device configured to be inclined and configured to transmit drive signals for the shift motor and the angle setting motor via slip rings, respectively, a position of the cutting torch with respect to a workpiece and a cutting torch. Control means for controlling the separation position of the cutting torch with respect to the turning axis and the tilt angle of the cutting torch with respect to the turning axis, a servomotor that rotates in response to a shift command of the cutting torch transmitted from the control means, and A pulse oscillator for generating a pulse according to rotation, and a pulse generated by the pulse oscillator A slip ring that transmits a signal to a shift motor, a servomotor that rotates in response to a tilt command of a cutting torch transmitted from the control unit, a pulse oscillator that generates a pulse according to the rotation of the servomotor, and the pulse And a slip ring for transmitting a pulse signal generated by the oscillator to the angle setting motor.

<Operation> According to the above means, the angle setting and the shift setting of the cutting torch can be performed continuously while continuing the cutting work on the workpiece.

That is, the position of the cutting torch with respect to the workpiece is continuously controlled by control means for controlling the position of the cutting torch with respect to the workpiece, the position of the cutting torch away from the center of rotation, the inclination angle of the cutting torch with respect to the pivot axis, and the like. Thus, the cutting operation for the workpiece can be continuously performed.

Further, the servo motor is driven according to the shift command transmitted from the control means, a pulse is generated by a pulse oscillator according to the rotation of the servo motor, and the pulse is transmitted to the shift motor via a slip ring, A servo motor is driven in accordance with a tilt command transmitted from the control means, a pulse is generated by a pulse oscillator according to the rotation of the servo motor, and the pulse is transmitted to an angle setting motor via a slip ring. Therefore, when performing the setting of the shift of the cutting torch and the setting of the angle of the cutting torch with respect to the turning axis, the corresponding servo motors are driven in accordance with the shift command and the tilt command transmitted from the control means, respectively. Feedback control can be performed. Therefore, these servo systems can be handled as independent control axes in the control means, and thus can be easily used as NC control axes.

Therefore, by controlling the torch angle control and shift control and the control of the axes in the two orthogonal directions of the cutting torch as one control system, the shift setting of the cutting torch is synchronized with the movement of the cutting torch in the two orthogonal directions. And the angle can be set, whereby the shift and the angle change of the cutting torch can be continuously performed in synchronization with the cutting operation on the workpiece.

<Embodiment> An embodiment of a groove cutting apparatus to which the above means is applied will be described below with reference to the drawings.

Fig. 1 is a schematic front view of a groove cutting device, Fig. 2 is a schematic side view, Fig. 3 is a block diagram of a control system, and Fig. 4 is an NC equipped with a groove cutting device according to the present invention. FIGS. 5 (a) to 5 (c) are explanatory views of a groove shape, and FIGS. 6 (a) and 6 (b) are diagrams illustrating a work material and a cutting torch when performing groove cutting. FIG.

First, the configuration of an NC cutting machine that can suitably use the groove cutting device according to the present invention will be described with reference to FIG.

In the figure, rails 1 laid in parallel along the x direction
A carriage 2 having a cross garter 2a arranged in a direction (y direction) orthogonal to the rail 1 is placed on the rail. The cart 2 is an x motor 2b controlled by an NC device 21 described later.
, And can travel along the rail 1 in the x direction. A cross rail 2c is provided along a cross garter 2a of the carriage 2, and a carriage 3 is mounted on the rail 2c.

The carriage 3 is driven by a y motor 3a controlled by the NC device 21, and is configured to be able to traverse in the y direction along the cross rail 2c. A lifting device 4 is provided on the carriage 3, and a groove cutting device A having a cutting torch 5 such as a gas cutting torch, a plasma cutting torch, or a laser cutting torch is mounted on the lift device 4.

A control panel B which accommodates the NC device 21 at a predetermined position of the carriage 2
Is provided.

In the NC cutting machine configured as above,
When the data of the shape to be cut from the workpiece C and the cutting speed data for the workpiece C are input to 21 and the cutting operation is started, the NC device 21 sends the x motor 2b and the y motor 3a according to the cutting shape. The drive signal is transmitted, and the respective motors 2b and 3a rotate according to the respective drive signals, thereby moving the cutting torch 5 in the x and y directions, thereby cutting the workpiece C into a predetermined shape. It is possible to do.

Next, the positional relationship between the workpiece C and the cutting torch 5 when performing groove cutting will be described with reference to FIGS. 5 (a) to 5 (c) and FIG.

When performing groove cutting on the workpiece C, the cutting torch 5
Is specified by the coordinates of the route face R when forming the X groove shown in FIG. 5 (a) or when forming the Y groove shown in FIG. 5 (b),
When the V groove shown in FIG. 3C is formed, it is specified by the coordinates of the lower edge E of the cut surface.

As shown in FIG. 6 (a), the rotation center O when the cutting torch 5 is inclined is set at a position separated from the tip of the cutting torch 5 by a predetermined distance. When forming a groove in the workpiece C, the distance between the cutting torch 5 and the root face R or the distance from the lower edge E changes according to the thickness of the workpiece C.

Therefore, when cutting the groove at an angle θ with reference to the lower edge E, the cutting torch 5 is inclined by θ degrees, and the torch 5 is shifted in the horizontal direction according to the angle θ and the thickness of the workpiece C. It is necessary. The shift amount s is a value uniquely determined when the angle θ is set because the thickness of the workpiece C is set in advance.

Next, the configuration of the groove cutting device A according to the present invention will be described with reference to FIGS.

In the figure, the lifting device 4 is controlled by an NC device 21. Before starting the cutting operation on the workpiece C and at the end of the cutting operation, the groove cutting device A is raised to a retracted state,
During the cutting operation, it is controlled by a signal from a height detection sensor (not shown) provided near the cutting torch 5,
The distance between the cutting torch 5 and the front of the workpiece C is maintained constant by raising and lowering the groove cutting device A in the directions of arrows a and b shown in FIG.

The elevating device 4 includes an elevating motor 4a fixed to the carriage 3, a guide member 4b provided vertically with respect to the carriage 3, and an elevating bracket capable of elevating along the guide member 4b.
4c, a driving member 4d that raises and lowers the lifting bracket 4c by rotation of the lifting motor 4a.

The lifting / lowering motor 4a is configured by a forward / reverse rotation motor, and is configured to transmit the rotation of the motor 4a to the lifting / lowering bracket 4c via the driving member 4d to raise and lower the cutting torch 5.

The groove cutting device A inclines the cutting torch 5 to a preset angle and shifts the torch 5 to a predetermined position prior to the start of the cutting operation on the workpiece C or as the cutting operation proceeds. Further, when the cutting shape for the workpiece C is an arc, the inclined cutting torch 5 is turned around the axis 6a of the turning device 6 in accordance with the curvature of the curve as the cutting operation progresses. It is.

The groove cutting device A includes a turning device 6 fixed to the lifting bracket 4c, a turning chamber 7 serving as a relay joint for gas fluid, cooling water, electric signals, etc. supplied to the torch 5 according to the structure of the cutting torch 5, cutting. It comprises a shift device 8 for shifting the torch 5 from the axis 6a of the turning device 6, and a tilting device 9 for tilting the cutting torch 5 at a predetermined angle.

The turning device 6 is fixed to a lifting bracket 4c via a frame 6b. Cover provided on top of frame 6b
A turning motor 6d is provided inside 6c, and the turning arm 6e is turned around the axis 6a by the rotation of the turning motor 6d.

Further, the frame 6b is formed in a hollow cylindrical shape, and hoses for supplying gas fluid, cooling water, etc. (not shown) therein,
It houses electric wires for transmitting pulse signals to the shift motor 8b and the angle setting motor 9c, a transmission mechanism for transmitting rotation of the turning motor 6d to the turning arm 6e, and the like.

The swirling chamber 7 is provided at a lower end of the frame 6b. The swirl chamber 7 is composed of a fixed member fixed to the frame 6b and a swivel member fixed to the swivel arm, and a joint portion such as a gas fluid or cooling water is formed at a contact portion of these members. At the same time, the contact 7
a and 7b are provided, and a slip ring 7c that contacts the contact 7a and a slip ring 7d that contacts the contact 7b
Is provided.

The contacts 7a, 7b and the slip rings 7c, 7d are for transmitting pulses generated in pulse oscillators 10b, 10d to be described later to the shift motor 8b and the angle setting motor 9c, respectively.

The shift device 8 is fixed to the turning arm 6e. The shift device 8 is configured such that the bracket 9a of the angle setting device 9 is
The shift is performed in the d direction. For this reason, the shift device 8 is arranged in the horizontal direction, the shift frame 8a fixed to the revolving arm 6e, the shift motor 8b fixed to the shift frame 8a, and the bracket 9a moved in the directions of arrows c and d by the rotation of the shift motor 8b. And a driving member 8c to be moved.

The shift motor 8b is configured by a pulse motor that can rotate in the forward and reverse directions, and the rotation direction and the amount of rotation are controlled by a pulse signal transmitted via the contact 7a and the slip ring 7c.

The pulse signal transmitted to the shift motor 8b is generated by mechanically connecting a pulse oscillator 10b such as a rotary encoder to a shaft of a servo motor 10a provided at a predetermined position of the cross garter 2a. The pulse signal is transmitted to the shift motor 8b via an electric wire, a contact 7a, and a slip ring 7c (not shown), whereby the shift motor 8b is rotated in accordance with the rotation direction and the rotation amount of the servo motor 10a.
It is possible to rotate b.

The angle setting device 9 sets the torch 5 at a predetermined angle by inclining the cutting torch 5 in the directions of arrows e and f.
The angle setting device 9 is provided at an end of a bracket 9a, and is connected to the shift device 8 via the bracket 9a. The angle setting device 9 includes a plurality of links 9b and links 9b.
Setting motor 9c for setting the angle of the cutting torch 5 by driving the torch, and a torch holder provided at the end of the link 9b
9d.

The angle setting motor 9c is constituted by a pulse motor that can rotate forward and reverse, and the rotation direction and the rotation amount are controlled by a pulse signal transmitted through the contact 7b and the slip ring 7d.

The pulse signal transmitted to the angle setting motor 9c is generated by mechanically connecting a pulse oscillator 10d such as a rotary encoder to a shaft of a servo motor 10c provided at a predetermined position of the cross garter 2a. Then, the pulse signal is supplied to an electric wire (not shown), a contact 7b, a slip ring 7d.
The angle setting motor 9c can be rotated in accordance with the rotation direction and the amount of rotation of the servo motor 10c by transmitting the rotation to the angle setting motor 9c via the.

Next, the control system of the groove cutting device A and the NC cutting machine configured as described above will be described with reference to FIG.

In the figure, reference numeral 21 denotes an NC device serving as control means of the groove cutting device A and the NC cutting machine, which calculates a shift amount in accordance with the thickness of the workpiece and the inclination angle of the cutting torch 5, or CPU for issuing a predetermined calculation and command execution command, plate thickness, cutting speed, cutting shape,
It is composed of a RAM for temporarily storing data such as a groove shape, data calculated by the CPU, and a ROM on which a predetermined program is written. 23 is an interface, 24 is a display for displaying information input by the keyboard 22 and the operating state of the NC cutting machine, 25 is a height sensor for detecting the interval between the cutting torch 5 and the workpiece C, and 26a to 26f are each Driver for driving motors 2b, 3a, 4a, 10a, 10c, 6d, 2
7a is an amplifier for amplifying a pulse generated from the pulse oscillator 10b into a current capable of driving the shift motor 8b, and 27b is an angle setting motor 9c for converting the pulse generated from the pulse oscillator 10d.
Is an amplifier that amplifies the current to drive the current.

In the groove cutting device A configured as described above, the shift motor 8b and the angle setting motor 9c are controlled by the rotation of the servo motors 10a and 10c, respectively. The servo motors 10a, 10c are each configured as an independent control axis in the NC device 21, and therefore, these motors 10a, 10c
The shift motor 8b and the angle setting motor 9c that rotate in the rotation direction and the rotation amount according to the rotation direction and rotation amount of 10c can be indirectly configured as control axes of the NC device 21.

For this reason, the NC device 21 uses the x motor 2b, y motor
By controlling 3a and performing the cutting operation on the workpiece C by the cutting torch 5, it is possible to execute the angle setting and shift of the cutting torch 5 in synchronization with the movement of the torch 5.

Next, an operation for performing the groove cutting shown in FIG. 6B will be described.

In the figure, a section F is a section for performing a so-called I-cut in which a cut surface is vertical, a section H is a groove-cut section having a predetermined angle, and a section G is shifted from the I-cut to a groove-cut. This is the transition section to be performed.

In the section F, the cutting torch 5 maintains a vertical state with respect to the workpiece C as shown in FIG.

When shifting from the section F to the section G, the shift command is transmitted from the NC device 21 to the servomotor 10a and the tilt command is transmitted to the servomotor 10c. The commands are generated in synchronization with the drive commands for the x motor 2b and the y motor 3a. Servo motors 10a, 10c rotate with a rotation direction and a rotation amount according to the command, and pulse oscillators 10b,
A pulse signal corresponding to the rotation of the servo motors 10a and 10c is generated from 10d. The pulse signals are amplified by the amplifiers 27a and 27b, respectively, and transmitted to the shift motor 8b and the angle setting motor 9c via the contacts 7a and 7b and the slip rings 7c and 7d, respectively.

The shift motor 8b rotates in the direction and amount of rotation corresponding to the transmitted pulse signal, thereby moving the bracket 9a of the angle setting device 9 in the direction of arrow c. The angle setting motor 9c rotates in the direction and amount of rotation corresponding to the transmitted pulse signal, thereby tilting the cutting torch 5 in the direction of arrow e.

Angle setting and shift of the cutting torch 5 and x,
The movement in the y direction is performed simultaneously, and the lower edge E of the cut surface is cut along the contour of the set cut shape as shown in FIG.

The angle setting and shift of the cutting torch 5 are completed during the section G, and in the section H, the groove cutting can be performed with a predetermined inclination angle.

<Effects of the Invention> As described in detail above, according to the groove cutting device according to the present invention, a drive signal for an angle setting motor for setting the angle of the cutting torch, and for setting a shift of the cutting torch. The drive signal for the shift motor is a pulse signal obtained by converting the rotation of the corresponding servo motor by a pulse oscillator, and the signal is transmitted to the shift motor and the angle setting motor via the slip ring. The control and the control for the angle setting motor can be configured as independent control axes in the control means. For this reason,
Even during the cutting operation on the workpiece, the torch can be tilted and shifted in synchronization with the movement of the cutting torch.

Therefore, when performing groove cutting with different angles in one shape, the angle setting and shifting of the cutting torch can be continuously performed while performing the cutting operation. For this reason, it has features that the efficiency of the cutting operation can be improved and a uniform cut surface can be obtained.

[Brief description of the drawings]

Fig. 1 is a schematic front view of a groove cutting device, Fig. 2 is a schematic side view, Fig. 3 is a block diagram of a control system, and Fig. 4 is an NC equipped with a groove cutting device according to the present invention. FIGS. 5 (a) to 5 (c) are explanatory views of a groove shape, and FIGS. 6 (a) and 6 (b) are diagrams illustrating a work material and a cutting torch when performing groove cutting. FIG. A is a groove cutting device, B is a control panel, C is a workpiece, 1 is a rail, 2 is a bogie, 2b is an x motor, 3 is a carriage, 3a
Is a y motor, 4 is a lifting device, 4a is a lifting motor, 5 is a cutting torch, 6 is a rotating device, 6d is a rotating motor, 6e is a rotating arm, 7 is a rotating chamber, 7a and 7b are contacts, 7c and 7d.
Is a slip ring, 8 is a shift device, 8b is a shift motor, 9 is an angle setting device, 9a is a bracket, 9c is an angle setting motor, 10a and 10c are servo motors, 10b and 10d are pulse oscillators, 21 is an NC device, 22 Is a keyboard, 23 is an interface, 24 is a display, 25 is a height sensor, 26a-2
6f is a driver, and 27a and 27b are amplifiers.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tokuharu Tanaka 3-35-16 Nishi Koiwa, Edogawa-ku, Tokyo Inside the Oxygen Industry Co., Ltd. (72) Inventor Susumu Ogura 3-35-16 Nishi Koiwa, Edogawa-ku, Tokyo Koike Oxygen Industry Co., Ltd. (72) Inventor Takashi Furukawa 3-35-16 Nishi Koiwa, Edogawa-ku, Tokyo Koike Oxygen Industry Co., Ltd. (56) References JP-A-50-61359 (JP, A) JP-A-63- 130267 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 7/00 507 B23K 7/00 505 B23K 31/00 B23K 7/10

Claims (1)

(57) [Claims] A cutting torch for cutting a workpiece is separated from a center of rotation by a shift motor and tilted by an angle setting motor, and drive signals for the shift motor and the angle setting motor are respectively supplied to a slip ring. In the groove cutting device configured to transmit the cutting torch, the position of the cutting torch with respect to the workpiece, the separation position from the turning center of the cutting torch, and the inclination angle of the cutting torch with respect to the turning axis are controlled. Control means, a servomotor that rotates in accordance with a shift command of the cutting torch transmitted from the control means, a pulse oscillator that generates a pulse corresponding to the rotation of the servomotor, and a pulse signal generated by the pulse oscillator. Slip ring for transmission to shift motor and transmission from the control means A servo motor that rotates in accordance with a tilt command of a cutting torch to be cut, a pulse oscillator that generates a pulse according to the rotation of the servo motor, and a slip ring that transmits a pulse signal generated by the pulse oscillator to an angle setting motor. A groove cutting device characterized by having and comprising.