JPH0596389A - Nozzle for laser beam machine - Google Patents

Abstract

PURPOSE:To reduce changing parts of a nozzle device and to simplify the operation by insulating a first electrode with an insulating resin coating material and arranging a connector easily executing wiring. CONSTITUTION:The first electrode 4b for detecting distance between the tip part of a nozzle and a work as static electric capacity is integrated with the first electrode base 4a by coating poly-imido resin to insulate the outer periphery and the upper surface thereof. A second electrode 2 at inside insulates the lower surface and the inside, and a male screw is formed on the outer peripheral. part. The connector 3 connects with the first electrode base 4a by an amplifier circuit and a coaxial cable. By this constitution, the operation for exchanging the first electrode base 4a together with the first electrode 4b part remarkably damaged is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing machine for processing a work by condensing laser light with a condenser lens and irradiating it from the nozzle tip, and detecting the distance between the nozzle tip and the work by electrostatic capacitance. The present invention relates to a nozzle device provided with an electrode for performing.

[0002]

2. Description of the Related Art A laser beam machine is required to keep a focus position of a work and a laser beam constant in order to maintain a machining accuracy. Therefore, conventionally, as a means for maintaining the distance between the nozzle and the work, there has been a method of detecting an electrostatic capacitance according to the distance by an electrode at the tip of the nozzle and driving the nozzle up and down based on the detected amount. .. This method is a very effective means for machining because it can detect the distance to the workpiece without contact.

[0003]

However, since the wiring from the amplifier circuit of the first electrode used in the nozzle device often uses a connector, it is necessary to reconnect the wiring between the connector and the electrode for each replacement. Therefore, it is necessary to judge whether or not to replace the insulating device each time the nozzle device is replaced.

The present invention has been made in view of these problems, and an object of the present invention is to provide a nozzle device in which the replacement parts of the nozzle device are reduced and the replacement work is simplified.

[0005]

In order to achieve the above object, the present inventor has made the connection from the amplifier circuit of the nozzle device a detachable connector so that soldering is unnecessary and the outer circumference of the first electrode is eliminated. We focused on a nozzle that eliminates the need to separately provide an insulating part by subjecting the surface to an insulating process made of polyimide resin.

That is, the gist of the present invention is "a first electrode for detecting the distance between the tip of the nozzle and the work as electrostatic capacity, and a second electrode for electromagnetic shielding provided on the outer peripheral portion of the first electrode. And an insulating portion provided between the first electrode and the second electrode,
In a nozzle of a laser processing machine consisting of a nozzle body and a connecting portion provided between the laser processing machine, the outer peripheral surface of the first electrode is insulation-processed to form the insulating portion. A nozzle for a laser beam machine, characterized in that the nozzle is provided with a connector for connecting the first electrode to a circuit, and the connecting portion is made of a member that is insulating and absorbs impact. "
Is.

The connector may be any connector that can be easily attached and detached, and need not be a specially designed connector.

The insulating portion is formed by insulating the outer peripheral surface of the first electrode with polyimide resin before assembling the nozzle device, and the assembly can be simplified by integrating the first electrode and the insulating portion. It should be noted that the polyimide resin does not have to be polyimide resin as long as it can be insulated from the first electrode.

The connecting portion serves to connect the nozzle body and the processing machine, and it is preferable that the connecting portion has a variable thickness and is capable of absorbing shock when the nozzle device collides with a work.

[0010]

EXAMPLE An example of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view of a nozzle device according to an embodiment of the present invention, in which a connecting portion 1 made of ceramics is a member for connecting a nozzle body and a laser processing machine (not shown) on an upper inner peripheral side surface. And an inner second electrode 2 for fixing the first electrode base 4a on the inner surface of the lower portion with the insulating portion 5 interposed.
And a connector 3 that enables connection from an amplifier circuit, and an outer peripheral surface is connected to an insulating first electrode base 4a, a first electrode 4b for detecting a distance to a work, and an inner second electrode 2. And an outer second electrode 6 connected to each other.

The connecting portion 1 connects the nozzle body and the laser processing machine. Since the members are made of machinable ceramics, the thickness can be easily adjusted, the nozzle device can be prevented from being damaged when the workpiece collides, and the laser processing machine body can be prevented from being damaged. It can be done, and the price can be kept low.

The inner second electrode 2 is coated with a polyimide resin on the lower surface and the inner side to enhance the insulating property, and the outer peripheral portion is subjected to male screw processing and screwed with the female screw of the outer second electrode 6. The first electrode base 4a is pressed and fixed at a predetermined position, and at the same time, the line of electric force of the first electrode 4b is prevented from going upward to enhance the directivity, and the stable operation of detecting the distance between the tip of the nozzle device and the work is performed. It serves to assist.

The connector 3 is a connector for connecting a coaxial cable, which is connected from an amplifier circuit (not shown), to the first electrode base 4a through a subminiature connector without soldering or the like. The side of the first electrode base 4a is provided with a hole into which the connector can be fitted, the side of the hole is insulated, only the bottom is in the same state so as to make contact with the first electrode, and the second electrode is a screw. It is fixed by a stopper. Therefore, it can be created by a simple process. By providing this connector, it is not necessary to perform soldering work or the like by connecting each time the nozzle device is replaced, and other parts are also unnecessary. Therefore, time and cost can be reduced.

The first electrode base 4a fixes the first electrode 4b for detecting the distance of the work, is provided with the sub-miniature connector 3 for connecting with the amplifier circuit on the outer peripheral side surface, and the outer peripheral surface is insulated. Has been done. Since this insulation processing uses a polyimide resin, the insulation processing can be facilitated regardless of the size and shape.

The first electrode 4b is for detecting the distance between the work and the tip of the nozzle, and is the most worn and damaged in terms of the degree of wear of the nozzle device. The first electrode 4b is
By exchanging screws with the first electrode base 4a, the exchangeability thereof is facilitated.

The insulator 5 is for insulating the first electrode base 4a from the second electrodes 2 and 6. This insulator 5
Is obtained by insulating the outer peripheral surface of the first electrode base 4a with a polyimide resin, and can be insulated without separately providing an insulator.

The outer second electrode 6 is provided with a female screw inside from the upper part to the middle, and the first electrode base 4a to which the first electrode 4b is attached can be accommodated and fixed by the inner second electrode 2 from the upper part. The connecting part 1 made of ceramics can be screwed and fixed to the upper part thereof.

The connecting portion 1 is a ceramic having an insulating property and a thickness that can be adjusted. When the nozzle device collides with the work, the connecting portion 1 can absorb the impact and prevent the main body of the processing machine from being damaged. Productivity in shape and quantity makes it possible to keep prices low.

[0019]

Since the present invention has the above-mentioned structure, it has the following effects. (1) By performing insulation processing on the outer peripheral surface of the first electrode using a polyimide resin for the insulating portion between the first electrode and the second electrode, it is possible to perform insulation regardless of size, processing, shape, etc.
Moreover, it is possible to insulate without impairing the conventional insulating property, and the insulating process is inexpensive, and it is excellent in heat resistance, wear resistance and impact resistance. (2) Further, by providing the connector, it is possible to connect to the amplifier circuit without soldering etc. when replacing the nozzle device. (3) By using a shock absorbing material for the connecting portion of the nozzle device, damage to the processing machine body can be prevented. Therefore, the practical value of the present invention is great.

[Brief description of drawings]

FIG. 1 is a sectional view of a nozzle device.

[Explanation of symbols]

 1 Connection Part 2 Inner Second Electrode 2a Insulating Part (Polyimide Resin) 3 Connector 4a First Electrode Base 4b First Electrode 5 Insulating Part (Polyimide Resin) 6 Outer Second Electrode

Claims (3)

[Claims] 1. A first electrode for detecting a distance between a nozzle tip and a work as a capacitance, a second electrode for electromagnetic shielding provided on an outer peripheral portion of the first electrode, and the first electrode. In a nozzle of a laser processing machine comprising an insulating part provided between a second electrode and a connecting part provided between a nozzle body and a laser processing machine, the outer peripheral surface of the first electrode is subjected to an insulating process for insulation. A nozzle for a laser processing machine, which is characterized in that a portion is formed. 2. The nozzle of a laser beam machine according to claim 1, wherein the first electrode is provided with a connector for connecting to a circuit. 3. The nozzle of a laser beam machine according to claim 1, wherein the connecting portion is made of an insulating material and a shock absorbing material.