JPS5954487A - Working head for laser - Google Patents

Abstract

PURPOSE:To perform satisfactory working by providing a magnetic sensor or electrostatic capacity type sensor in the end part of a nozzle for blowing an assist gas, and measuring the distance between the working head and the work in the part where the assist gas is blown and the part where a laser is irradiated. CONSTITUTION:A titled head is constituted of a noncontact sensor 16, a nozzle 2 constituted of a water cooling part 17 for cooling the same, a working head 1 for holding the same, and a head driving part which moves upward or downward apart at a gap (g) therefrom. If the sensor 16 is a magnetic sensor, the change DELTAZ of the impedance Z in the sensor coil is DELTAZproportional g with g designated as a gap, and in the case of an electrostatic type sensor, the change DELTAC in the electrostatic capacity C is DELTACproportional 1/g. Therefore, the g can be calculated by detecting DELTAZ, DELTAC. Since the gap in the working position is measured in such a way, the accuracy is made several times higher than in the prior art.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser processing apparatus, and particularly to a processing head that can stably obtain a good force.

Example 1, Figure 3 shows a commonly used method for maintaining the gap g between the machining head and the workpiece and obtaining good force resistance using the V-za machining device P<. Shown below. This will be explained below with reference to FIGS. 1 to 3.

Conventionally, the condenser lens 9, the nozzle 2, and the assist gas 1
1, a processing head 1 consisting of a hole that sprays
It consisted of a head holder 3 for holding it, a head drive section 4 for driving these t up and down, a contact type gap detection sensor 5 for detecting the gap g, and its sensor blower 6. As shown in Figure 2, the gap.

g and the assist gas pressure p1 blown onto the workpiece 7
There is a relationship of Vupl gm- between them, and when g changes, l]1 changes greatly. Therefore, in the case of cutting, roughness of the cut surface 13, adhesion of dross 14, and FIG. This causes a change in the cutting width l], which significantly reduces workability.

Therefore, it is necessary to keep g constant, but since the 9F method is a contact type and Q is a contact type, and the machining part and gear lug 4 protrusion ↑ position are separated by a distance t, ■ machining. If there is a harmful substance 8 such as spatter in the direction, the sensor height - blow 6 may be affected by waves, an error may occur in the detection gap - d, or 6 may land on 8 and become inoperable. There is a risk of

■ Since the detection is performed from a distance of t, there is a risk of a difference in the gap with the machining part by 3%.

There is a way to solve this problem by installing a delay circuit and performing internal arithmetic processing, but this will cause problems with the back circuit of the flilJ control circuit.

There was a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a laser machining head drive unit that is compact and capable of efficiently detecting gaps between workpieces at the machining location and performing good machining.

In general, in addition to the above-mentioned contact gap sensor, a magnetic sensor length -1 static volume Iλ type sensor is often used as a non-contact gap sensor to automate the arc welding process.
However, due to the phenomenon of magnetic blowing on the arc, these sensors are installed far away from the processing area in Jin and Ichikawa.

On the other hand, unlike an arc, a laser uses light, so there is no phenomenon such as magnetic blowing. Therefore, a general non-contact seven point must be provided integrally at the tip of the processing nozzle.V'CJ:
Is there a gap between the workpieces at the machining area? A detectable machining head can be provided.

FIGS. 4 and 5 are diagrams of the present invention.

Non-contact sensor 16 and its cooling water rir t4
The nozzle 2 is made up of a nozzle 17, the processing head 1 is held, and the head drive unit 44 is made up of a head drive unit 44 that faces the upper and lower surfaces by the gap g.

16 (l, magnetic sensor or static '[capacitive type sensor, in the case of a magnetic sensor, 7/length - change in impedance Z1 in the coil ΔZ LrJ, g 'c, gap, ΔZvg 1!fl electric Valley 1. [Type sensor's] station, static 11. Valley C change ΔC is changed by ΔCw -, so these ΔZ or ΔC'): By detecting g can be easily reversed ↑f can do.

The temperature of the sensor 16 increases due to the radiant heat of the cooling water cooling section 17.
4. This is to prevent people from doing something like this.

In addition, it has a +R construction that can form 12 nozzle holes for blowing 11 16Q near assist gases.

In the figure, 7i'' is a processed workpiece, 101 is a laser beam, and 15rj is cut ii; Ir rlj te.

According to the present invention, 2'L allows the geyap detection section to be made compact from 17 to 115 or less compared to the previous model.
Even with a proboscis, gaps can be detected, and
Power 1" You can measure all the gears from Tamana I to tq, so the power I is several times more than the conventional one! Improvements can be made.

[Brief explanation of the drawing]

8′! Figure 1 T is a side view of the conventional 44 configuration, Figure 1412 is -
Cross-sectional view of L゛, 4' figure, cutting fi during machining + Ji,
Figures showing the situation of l'i''l'ia, jα4 Figure Q'', Figure 1iii on the side of the groove bottom by Mokuho Akira, Figure 5 has side view C.

Claims (1)

[Claims] 1. The entire distance between the processing head and the workpiece using a laser is detected, and a magnetic safety plate is installed at the end of the nozzle for blowing assist gas at 1. 9-1 Alternatively, a processing head for radar, characterized in that a capacitance type sensor is attached to measure the distance between the processing head and the workpiece at the assist gas blowing section and the laser irradiation section. 2. Claim 1 JA describes a sensor capable of forming a nozzle hole for blowing assist gas;
A laser processing machine comprising a water cooling section for preventing temperature rise due to radiant heat during processing, and means for producing a cooling sound effect by the assist gas.