JPH0549395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a laser processing device that performs processing such as cutting and welding of metals and nonmetals using a laser.

Conventional technology Conventionally, a single block stop command or program was issued from a numerical control device during laser processing control, while spraying auxiliary gas to the workpiece, or while spraying the workpiece with auxiliary gas and irradiating laser light. When a stop command, an optional stop command, or a temporary stop command (feed hold) from a machining operator is issued and the numerical control device is temporarily stopped, the auxiliary gas remains in the spraying state. Or, the auxiliary gas was still being blown and the laser beam was still being irradiated.

Problems to be Solved by the Invention As described in the section of the prior art, when a temporary stop is commanded in a state where auxiliary gas is being blown, or auxiliary gas is being blown and laser light is irradiated, the auxiliary gas is being blown or The state of auxiliary gas spraying and laser light irradiation is uneconomical as the auxiliary gas is continuously sprayed unnecessarily, and the laser light irradiation state depends on the relative pause command between the laser light and the workpiece. When stopped, it was difficult to visually identify the vehicle, which posed a safety problem. Furthermore, when returning from a paused state and restarting laser processing, the state before the pause command is auxiliary gas spraying and laser light irradiation, and a relative movement command is issued between the laser light and the workpiece. In this case, if the return order is, for example, the movement command is returned, then the laser beam is irradiated, and then the auxiliary gas is sprayed, there will be parts of the workpiece that are not machined. Alternatively, the laser beam condensing section may be contaminated by evaporated debris from the workpiece because the auxiliary gas is not blown. The present invention attempts to solve this problem.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides the following: when a temporary stop command is issued during spraying of an auxiliary gas onto a workpiece, or during spraying of an auxiliary gas and laser beam irradiation.
It has an auxiliary gas stop and laser beam irradiation stop mechanism, and when a restart command is issued, if the state before the pause command is only the auxiliary gas spraying state, the auxiliary gas spraying is restarted, and then the operation of the numerical control device is restarted. If the state before the pause command was auxiliary gas spraying and laser beam irradiation, the restart command first restarts auxiliary gas spraying, then resumes laser beam irradiation, and then restarts the numerical value. It has a mechanism to return to the state before the temporary stop by restarting the control device.

Function The present invention provides that when a temporary stop command is issued while the auxiliary gas is being sprayed or the auxiliary gas is being sprayed and the laser beam is being irradiated, the auxiliary gas spraying is stopped, the laser beam irradiation is stopped, and the numerical value is By also stopping the control device, unnecessary auxiliary gas spraying is prevented, and it is safe because the laser light is not irradiated during a temporary stop, and when restarting, auxiliary gas spraying, laser light irradiation, and numerical control Since the operation returns in the order of operation, condensation of the condensing optical components is prevented, and processing can be continued seamlessly from the state before the pause.

Embodiment An embodiment of the present invention will be explained using a relay sequence circuit. In the figure, 1 is the first memory holding circuit that stores and holds the commands from the numerical control device for spraying and stopping the auxiliary gas.The auxiliary gas spraying command contact AGON (normally open contact) and the spraying stop command contact from the numerical control device Consists of AGOFF (normally closed contact), relay AGS, and relay contact AGS (a1) (normally open contact).
Auxiliary gas spray command contact AGON from the numerical control device
When is closed, relay AGS operates until spray stop command contact AGOFF opens. 2 is a first output relay circuit for spraying and stopping the auxiliary gas. 3 is a second memory holding circuit that stores and holds commands from the numerical control device for laser beam irradiation and irradiation stop; the laser beam irradiation command contact from the numerical control device;
LAO (normally open contact) and laser beam irradiation stop command contact
Consisting of LAS (normally closed contact), relay LOS, and normally open contact LOS (a1) of relay LOS, when the laser beam irradiation command contact LAO is closed from the numerical control device,
Laser beam irradiation stop command contact from numerical control device
Relay LOS operates until LAS opens. 4 is a second output relay circuit that performs laser beam irradiation and irradiation stop. 5 is a temporary stop command contact such as a single block stop command normally open contact SBK, an optional stop command normally open contact OPS, a program stop command normally open contact PS, etc. from the numerical control device,
The normally open contacts FS for the temporary stop command by the machining operator are connected in parallel, and when any one of the contacts SBK, OPS, PS, and FS closes, the normally closed contact CSS of the restart command relay CSS ( Relay MS contacts MS (a1) of relay MS until b1) opens.
This is a circuit configured to hold the signal. 6
7 is a circuit consisting of a normally open contact CS and a relay CSS that operates when the contact CS opens when restarting after a pause command is released, and 7 is a third circuit for restarting with a numerical controller after a pause. This is an output relay circuit. Next, the operation of the relay sequence circuit shown in the figure will be explained.

First of all, when neither the auxiliary gas nor the laser beam irradiation is commanded, that is, the relay AGS in the first memory holding circuit 1 is also activated in the second memory holding circuit 3.
If none of the relays LOS in the circuit 5 are operating, the temporary stop command contacts SBK, OPS,
When either PS or FS is closed, relay MS in circuit 5 operates and the state changes to MS(a
1), it is held in a paused state. To restart from this state, when the contact CS in circuit 6 is changed from open to closed, the relay CSS operates, and the relay contact CSS (b1) of the relay CSS in circuit 5 is changed from closed to open, so that the MS At the same time that the operation stops and the temporary stop state is released, the relay contact CSS (a1) of the relay CSS closes and the normally closed relay contact AGS (b) of the relay AGS closes in the third output relay circuit 7.
1) Relay CSR operates through this relay
The numerical control device resumes operation by operating the CSR.

Second, when the laser beam is not irradiated in the auxiliary gas spraying state, that is, the first memory holding circuit 1
When the relay AGS in the relay AGS is in the operation holding state and therefore the relay contact AGS (a2) of the relay AGS of the first output relay circuit 2 is in the closed state, the relay AG operates and the auxiliary gas is sprayed. However, when the relay LOS in the second memory holding circuit 3 is not in the operating state, a temporary stop command is given, and the relay MS in the circuit 5 operates, the MS
held by relay contact MS (a1) of MS,
At the same time as the temporary stop state is reached, the normally closed contact MS (b1) of the relay MS of the first output relay circuit 2 changes from closed to open, so the relay AG stops operating and stops blowing the auxiliary gas, It becomes temporarily stopped. To restart from this state, when contact CS of circuit 6 is closed, relay CSS operates and circuit 5
Since the contact CSS (b1) of the relay CSS inside is opened, the operation of the relay MS is canceled. For this purpose, the contacts of the relay MS in the first output relay circuit 2
By closing MS (b1), relay AG operates and sprays the auxiliary gas. Also, the relay contact CSS (a) of the relay CSS in the third output relay circuit 7
1) is closed, but the relay in the first memory holding circuit 1
Since AGS is in operation, contact AGS (b) of relay AGS
1) is open, the relay AG in the first output relay circuit 2 operates, and the contact AG (a2) of the relay AG operates.
The relay contact of relay LOS is activated only after
Relay CSR operates through LOS (b1), and the numerical control device operates due to the operation of relay CSR, and restarts operation.

Thirdly, when the auxiliary gas is being blown and the laser beam is being irradiated, that is, the relay AGS in the first memory holding circuit 1 is in the operation holding state, and the relay AG in the first output relay circuit 2 is operating. When the auxiliary gas is being sprayed and the relay LOS of the second memory holding circuit 3 is in the operation holding state, the relay contact LOS of the relay LOS in the second output relay circuit 4 is
(a2) is closed, relay contact AG of relay AG
(a1) is closed and a temporary stop command is not issued, the relay contact of relay MS
When MS (b2) is in the closed state, relay LO is operating, and the laser beam is irradiated, one of the contacts of the temporary stop command of circuit 5 is closed, and the relay
When the MS operates and the temporary stop command is held, the relay contact of the relay MS of the first output relay circuit 2
When MS (b1) opens, the operation of relay AG stops, thereby stopping auxiliary gas blowing, and the relay contact MS (b2) of relay MS in circuit 4 opens. Then, relay LO stops operating, laser light irradiation is stopped, and the state is temporarily stopped. To resume from this state, circuit 6
When the restart command contact CS in the circuit 5 is closed, the relay CSS operates, and the operating state of the relay MS in the circuit 5 is released by opening the relay contact CSS (b1) of the relay CSS. Therefore, when the relay contact MS (b1) of the relay MS in the first output relay circuit 2 closes and the auxiliary gas blowing resumes by operating the relay AG, the second output relay circuit 4 After the relay contact MS (b2) of the relay MS closes, the relay AG operates, that is, the auxiliary gas blowing operates first, and then the relay contact MS (a
1) closes, relay LO operates,
Laser light irradiation resumes. In addition, in the third output relay circuit 7, the relay CSS operates, its relay contact CSS (a1) is closed, and the relay AG contact
Relay CSR is activated only when AG (a2) is closed and then relay contact LO (a1) of relay LO is closed.
works. The numerical control device operates by operating this relay CSR. Regarding the restart operation described above, if necessary, it is possible to set a time limit by configuring a timer between the auxiliary relay operation, the laser beam irradiation, and then the numerical control device operation.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to prevent unnecessary spraying of auxiliary gas at the time of a temporary stop command, improve economic efficiency, improve safety by stopping laser beam irradiation, and restart. This not only ensures continuity of laser processing over time, but also prevents condensation of the condensing optical system, improves the reliability of the condensing optical system, and extends its lifespan.

[Brief explanation of the drawing]

The figure shows a relay sequence circuit of a laser processing device showing an embodiment of the present invention. 1... First memory holding circuit, 2... First output relay circuit, 3... Second memory holding circuit, 4... Second output relay circuit, 5, 6... Circuit, 7... Third output relay circuit.

Claims (1)

[Claims] 1. A laser oscillator, a light guide path that guides the laser beam output from the laser oscillator to the surface of the workpiece, a condensing device that focuses the laser beam on the surface of the workpiece, and a condensed laser beam and the workpiece. A work station that relatively moves an object, a laser output command, a specified output stop command, a command to spray auxiliary gas onto the surface of the workpiece, a spray stop command to the laser oscillator, and a focused laser beam. In a laser processing device equipped with a numerical control device that gives a relative movement command between workpieces, a temporary stop command is issued when the workpiece is being sprayed with auxiliary gas or when the workpiece is being sprayed with auxiliary gas and irradiated with laser light. It has a mechanism that stops both auxiliary gas spraying and laser light irradiation when processing is given, and when machining is restarted, the auxiliary gas spraying, laser light irradiation, and numerical control operation are returned to the state before the pause command in that order. A laser processing device with a mechanism.