JPH0436793B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a control means for a contact for tracing control in a laser processing device.

[Prior Art] FIG. 3 is a block diagram showing a conventional scanning control circuit, and FIG. 4 is a perspective view showing the state of drilling and cutting a hole in a workpiece 2. In the figure, 1 is a laser beam irradiated from a laser oscillator (not shown), 2 is a workpiece to be cut, 3 is a condenser lens for condensing the laser beam 1 onto the workpiece 2, and 4
5 is a contact that contacts the surface of the workpiece 2 in order to detect the distance between the workpiece 2 and the condensing lens 3 (hereinafter referred to as focal length), and 5 is a contact that converts the distance information detected by the contactor 4 into an electrical signal. 6 is a scanning control circuit that controls the focal length using an electric signal from the sensor 5; 7 is a scanning control circuit that controls the position of the condenser lens 3 perpendicular to the surface of the workpiece 2 using a signal from the scanning control circuit 6; A motor that can be changed in direction, 8 is a contact pulling mechanism, and this contact lifting mechanism 8 has an iron piece 9 fixed to the contact 4.
, an electromagnet 10 that pulls up the iron piece 9 when excited, a power source 11 for driving the electromagnet 10, and a driving contact 12. 13 is a normally open contact for pulling up the contact which is closed by an external signal when pulling up the contact 14; 14 is a relay that is energized when the normally open contact 13 for pulling up the contact is closed; 15 is a relay for the relay 14; A power source 16 is a normally closed contact connected to the copying control circuit 6, and is in an open state when the relay 14 is energized. Further, the driving contact 12 provided in the contactor lifting mechanism 8 is a normally open contact, and is in a closed state when the relay 14 is energized. 40 is a normally open contact 13 for pulling up the contact, a relay 14, and a power source 1.
5, and also has the function of stopping the operation of the copying control circuit 6 when the contactor lifting mechanism 8 is operated. Reference numeral 17 denotes a processing head to which a condensing lens 3 is attached, and a through hole through which the laser beam 1 passes is provided at the tip.

Next, the operation will be explained. The irregularities of the workpiece 2 are detected by the contact 4, and the distance (focal length) information resulting from this detection is converted into an electrical signal by the sensor 5, and the electrical signal is input to the scanning control circuit 6. The scanning control circuit 6 drives the motor 7 using a preset signal (focal position setting signal) and the electric signal from the sensor 5 so that the distance between the workpiece 2 and the condensing lens 3 is constant. Then, the position of the condenser lens 3 is moved in a direction perpendicular to the workpiece 2. Next, by condensing the laser beam 1 from a not-shown laser oscillator onto the workpiece 2 via the condensing lens 3,
As shown in FIG. 4, firstly, a through hole 2a is bored in the workpiece 2, and secondly, a through hole 2a is drilled in the workpiece 2, and secondly, a through hole 2a is drilled along a line 2b leading to an outline 2c to obtain a product 2d of the desired shape. Cutting is started, and thirdly, cutting is performed along the outline line 2c. A product 2d is obtained by such hole drilling and cutting operations. Next, product 2e (fourth
(see figure), the processing head 17 is moved from the place where the product 2d is taken out to the place where the product 2e is taken out.
must be moved relative to the horizontal direction of the workpiece 2. This movement is usually carried out at a rapid rate in order to shorten the working time.

During this rapid traverse movement, in order to prevent the workpiece 2 from being scratched or the tip of the contactor 4 to be worn out due to contact between the contactor 4 and the workpiece 2, the operator must perform tracing control. Input a command to pull up the contact 4, and perform fast forward movement while keeping the contact 4 pulled up.

That is, the normally open contact 13 for pulling up the contact is brought into a closed state by a signal from the outside. Then, the normally open contact 13 becomes closed and the relay 14
is excited. When the drive contact 12, which is a normally open contact, becomes closed due to the excitation of this relay 14,
When the drive power source 11 is turned on, the electromagnet 10 is exemplified and attracts the iron piece 9 upward. Therefore, the contact 4 to which the iron piece 9 is fixed is pulled upward away from the surface of the workpiece 2. Due to this movement of the contactor 4, a correction electric signal for correcting the focal length is outputted from the sensor 5 to the scanning control circuit 6. However, this copying control circuit 6
Since the normally closed contact 16 of the relay 14 is turned into an open state by the excitation of the relay 14, the scanning control function is stopped, so the motor 7 is driven by the corrected electric signal from the sensor 5. It never happens. Therefore, even if an external signal is input and the contact 4 is pulled up, the condenser lens 3 remains stationary at the position immediately before the external signal was input, and the position of the condenser lens 3 changes. I'll end up not doing it. In this way, the stop circuit 40 stops the operation of the copying control circuit 6 when the contactor lifting mechanism 8 operates.

[Problems to be Solved by the Invention] The conventional tracing control device for laser processing equipment is configured as described above, and the contact 4 is
In order to pull up the contact 4, it is necessary for the operator to input a lifting signal from the outside each time, which causes problems such as complicated operation and poor work efficiency. The workpiece 2 is not pulled up by the contact 4.
There were problems in that the contacts 4 were scratched and the contacts 4 were worn out.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laser processing apparatus scanning control device that can automatically pull up the contact 4 during rapid forward movement.

[Means for Solving the Problems] A tracing control device for a laser processing device according to the present invention includes an NC board that controls the relative position of a processing head having a laser beam condensing lens and a workpiece, and The distance between the workpiece and the condensing lens is controlled to be constant based on the output of a contact sensor that converts the distance information detected by the contactor that is in contact with the surface of the A tracing control circuit that stops the operation, a contact lifting mechanism that pulls up the tip of the contact from the workpiece when it receives a contact lifting signal, and a contact lifting mechanism that pulls up the tip of the contact from the workpiece when it receives a contact lifting signal, and a contact The device is equipped with a stop circuit that outputs a child lifting signal to operate the contact child lifting mechanism and also outputs an operation stop signal to stop the operation of the copying control circuit.

[Operation] In this invention, the fast forward movement command signal is
The relay was energized by the output signal from the NC board, and the contact of this relay was used as a normally open contact for pulling up the contact, so during rapid traverse movement,
The contact can be pulled up automatically.

Furthermore, in this invention, the contact and the workpiece are in contact with each other during the work of drilling a hole in the workpiece and during normal cutting work, but the contact and the workpiece are not in contact with each other during rapid traverse movement. Since there are no scratches on the workpiece, it is possible to prevent damage to the workpiece and reduce wear on the contactor.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2. Note that the same members as in FIGS. 3 and 4 are designated by the same reference numerals, and their explanations will be omitted. In the figure, 21 is a normally open contact that closes when a fast forward movement command signal is input from an NC board (not shown) to indicate the state of "fast forwarding", and 22 is a relay that is energized when the normally open contact 21 is closed. 23 is a normally open contact of the relay 22, which is closed when the relay 22 is energized.
14 is a relay similar to the conventional one, with normally open contact 2
3 is a relay that is energized when the circuit is closed. 4
0 is normally open contacts 21, 23, relays 22, 14,
This is a stop circuit composed of a power supply 15. A stop circuit 40 is operated by a fast-forward movement command signal outputted from the NC board, energizing the contact lifting mechanism 8, and stopping the operation of the copying control circuit 6.

In addition, in Fig. 1, each relay has #1,
In addition to the reference numeral #2, each contact that opens and closes depending on whether or not the relay is energized is indicated by the same reference numerals #1 and #2 corresponding to the respective relays.

Next, the operation will be explained. When cutting the workpiece 2 with the laser beam 1, the drilling operation of the hole 2a in the workpiece 2 is first performed. In other words, the relative positions of the laser beam 1 and the workpiece 2 are fixed, and the laser beam 1 is irradiated to a certain location for a certain period of time to form a hole 2a in the workpiece 2.
to be drilled. The pressure of the processing gas at that time is preferably lower than the pressure of the processing gas during general cutting. As shown in FIG. 4, when the hole 2a penetrating the workpiece 2 is drilled, the relative positions of the laser beam 1 and the workpiece 2 are moved, for example, along lines 2b and 2c, so that the workpiece 2 can be opened. can be cut freely to obtain product 2d. At this time, it is preferable that the pressure of the processing gas be higher than that at the time of drilling the hole 2a. It is also better to change the energy of the laser beam 1.

When drilling the hole 2a and cutting the hole 2a,
Since the fast-forward signal, which will be described later, is not output from the NC board, the normally open contact 21 is in an open state and the relay 22 is not excited (OFF state). Since relay 22 is not energized (OFF), normally open contact 2
3 becomes an open state, and the relay 14 becomes de-energized (OFF state). For this reason, the drive contact 12
is in an open state, the electromagnet 10 does not operate (OFF state), and the contact lifting mechanism 8 does not operate, so the contact 4 comes into contact with the workpiece 2,
The surface condition of the workpiece 2 is detected and the focal position is measured. In addition, since the relay 14 is de-energized, the normally closed contact 16 is in a closed state, and the copying control circuit 6 is activated (ON) to set the distance between the workpiece 2 and the condensing lens 3 to the set position. The motor 7 is driven to adjust the condenser lens 3 in a direction perpendicular to the workpiece 2. After completing the drilling work and cutting work for this hole 2a, the product 2d
get. Next, in order to obtain the product 2e (see Figure 4), it is necessary to rapidly move the processing head 17 relative to the horizontal direction of the workpiece 2 from the location where the product 2d is taken out to the location where the product 2e is taken out. be. During this fast-forward movement, a fast-forward movement command signal indicating "fast-forwarding" is output from an NC board (not shown), and this output signal is input to the normally open contact 21. Then, this normally open contact 21 becomes a closed circuit state,
The relay 22 is energized (ON), the normally open contact 23 is closed, and the relay 14 is thereby energized (ON state). Therefore, the normally open contact 12, which is a driving contact, becomes a closed circuit state. This normally open contact 12
A closed circuit means that the contact pull-up signal from the stop circuit 40 is input to the contact pull-up mechanism 8. Due to the input of this contact pull-up signal, the electromagnet 10 operates (ON state) and the contact The pulling mechanism 8 operates. This action causes the contact 4 to be pulled up, while the normally closed contact 16 becomes open. The opening of this normally closed contact 16 means that the operation stop signal from the stop circuit 40 has been input to the copying control circuit 6, and upon input of this operation stop signal, the copying control circuit 6 stops the copying control function. (OFF state). With the contactor 4 being pulled up, the relative positions of the laser beam 1 and the workpiece 2 are changed, and rapid forward movement is performed.

In order to change the relative position of the laser beam 1 and the workpiece 2 and perform fast forward movement, the laser beam 1
Or by moving the position of both or one of the workpieces 2.

Each of the above operations will be explained based on the sequence time chart shown in FIG. In the figure,
Assuming that time has elapsed from the left to the right, the normally open contact 21 is in a closed state before the start of hole drilling work A, since it is considered to be in a fast forward movement state. Since relay 22 is energized and normally open contact 23 is in a closed state, relay 1
4 is excited and becomes an ON state, the normally open contact 12 becomes a closed circuit state, the electromagnet 10 becomes an ON state, and the contactor 4 is pulled up. On the other hand, since the relay 14 is in the ON state, the normally closed contact 16 is in the open state, and the copying control circuit 16 is in the OFF state.

Next, the operations of each contact, each relay, etc. during hole drilling work and cutting work are shown as "hole drilling work A" and "cutting work A", respectively. When this "cutting operation A" is completed, the machining head 17 or the workpiece 2 is relatively moved to perform a fast forward movement A in order to process the next product 2e.
The operation of each contact and each relay at this time is as explained above. In this way, the hole drilling operation, the cutting operation, and the fast forwarding movement are repeatedly performed, and the product is manufactured and processed using the laser.

[Effects of the Invention] As described above, according to the present invention, it is possible to automatically pull up the contact 4 and stop the copying control circuit during fast forward movement, and the focal position can also be kept constant. Therefore, the operation of the scanning control device becomes easy, the workpiece is not damaged, and the life of the contactor is extended.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a profiling control device for a laser processing device according to an embodiment of the present invention, Fig. 2 is a time chart showing the sequence of an embodiment of the invention, and Fig. 3 is a block diagram of a profiling control device for a conventional laser processing device. FIG. 1 is a block diagram of the control device, and FIG. 4 is a perspective view showing the drilling and cutting state of the workpiece. In the figure, 2 is the workpiece, 3 is the condenser lens, and 4 is the workpiece.
5 is a contact, 5 is a contact type sensor, 6 is a copy control device, 8 is a contact lifting mechanism, and 40 is a stop circuit. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. An NC board that controls the relative position of a processing head having a laser beam condensing lens and a workpiece, and a contactor that contacts the surface of the workpiece that converts distance information detected by an electrical signal into an electrical signal. a tracing control circuit that controls the distance between the workpiece and the condensing lens to a constant value based on the output of the contact sensor that converts the output into a contact sensor, and that stops the operation when an operation stop signal is received; a contact pull-up mechanism that pulls up the tip of the contact from the workpiece when receiving a fast-forward movement command signal for the machining head from the NC board; A scanning control device for a laser processing apparatus, comprising a stop circuit that operates a sub-lifting mechanism and outputs the operation stop signal to stop the operation of the scanning control circuit.