JPH06335787A - Numerical controller for laser beam machine - Google Patents

Abstract

PURPOSE:To provide a numerical controller for a laser beam machine, having a function possible to estimate the kind of a work. CONSTITUTION:A lens 2 for converging a laser beam 3, a nozzle 1 with a sensor 6 receiving reflected light 5 from a work 4, a horizontal direction drive device 8 horizontally moving the nozzle 1 to the work 4, a focus adjusting device 7 adjusting a focus, and a material data storage part 12 storing a data for estimating the material of the work 4, are provided. And, a sensor data storage part 9 storing a data from the sensor 6, a horizontal direction coordinates storage part 10 storing the nozzle coordinates in the horizontal direction, and a data analysis part 11 estimating a material by analyzing the data of the sensor data storage part 9 and the data of the horizontal direction coordinates storage part 10, and comparing it with the data of the material data storage part 12, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control device for a laser processing machine.

[0002]

2. Description of the Related Art A numerical control device for a laser processing machine sets processing conditions such as laser output, gas pressure of assist gas, and cutting speed to values suitable for the work in order to process the work at high speed and with high accuracy. Must. Since the processing conditions differ depending on the material and plate thickness of the work, the laser output, the gas pressure of the assist gas, and the cutting speed must be changed whenever the material and plate thickness of the work change. In the market, there is a demand for a numerical control device for a laser processing machine that can automatically set the processing conditions for high-speed, high-precision processing with uniform quality without the need for processing knowledge or skill. There is.

A conventional numerical control device for a laser processing machine will be described below. FIG. 5 shows a block diagram of a processing condition determining unit of a conventional numerical control device for a laser processing machine. Reference numeral 13 is a plate thickness measuring device, 14 is a keyboard for inputting the material and plate thickness of the work, 15 is a processing condition control unit, and 16 is a processing condition table.

With respect to the processing condition determining section of the numerical control device for a laser beam machine, which comprises the above-described components, the relationship between these components and the operation thereof will be described below. First, processing conditions such as laser output, assist gas pressure, and cutting speed are stored in advance in the processing condition table 16 for each work material and plate thickness. The material and plate thickness of the workpiece are manually input from the keyboard 14, and the processing condition control unit reads the processing conditions in the processing condition table 16 corresponding to the input material and plate thickness values, laser output, assist gas pressure, and cutting speed. The speed was decided. For further automation, with respect to the plate thickness, the plate thickness measuring device 13 is connected to the outside and the output data thereof is input to the processing condition control unit to automatically input the plate thickness.

[0005]

However, in the above-mentioned conventional configuration, there is no device for recognizing the material of the work, so that the material of the work must be manually input from the keyboard 14. Was.

The present invention solves the above problems, and an object of the present invention is to provide a numerical control device for a laser processing machine capable of estimating the material of a work.

[0007]

In order to achieve the above object, a numerical controller for a laser beam machine according to the present invention has a lens for condensing a laser beam and a sensor for receiving a reflected light from a work. A nozzle, a horizontal drive device that moves the nozzle horizontally with respect to the work, a focus adjustment device that adjusts the focus of the lens, a material data storage unit that stores data for estimating the material of the work, and the sensor. From the sensor data storage unit, the horizontal coordinate storage unit that stores the horizontal nozzle coordinates, the sensor data storage unit data and the horizontal coordinate storage unit data are analyzed, and the material data storage unit It is equipped with a data analysis unit that estimates the material quality of the work by comparing it with the data of.

[0008]

With this configuration, first, the output of the laser light is
Even if the focus of the laser beam is on the work, set it to a value that does not affect the work such as melting. However, the value of the laser beam must be set to the same value every time. Next, the focus adjusting device moves the laser light to the coordinates where the focus is formed on the work. With the laser beam focused on the work,
The nozzle is moved a certain distance by the horizontal drive device, the coordinates at that time are stored in the horizontal coordinate storage unit, and the data from the sensor at that coordinate is stored in the sensor data storage unit.

In the data analysis unit, the data in the sensor data storage unit is read and the maximum value, the minimum value and the average value of the sensor data are obtained. Further, the change value of the output of the sensor data per unit distance is obtained from the movement distance data of the horizontal coordinate storage unit and the data of the sensor data storage unit. The material of the work is estimated by comparing the maximum value, the minimum value, the average value of the sensor data obtained by the data analysis unit, and the change value of the output of the sensor data per unit distance with the data in the material data storage unit. be able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a numerical controller for a laser processing machine according to an embodiment of the present invention.

In FIG. 1, 1 is a nozzle for outputting a laser beam of a laser processing machine, 2 is a lens for converging the laser beam,
Reference numeral 3 is a laser beam output from a laser oscillator, 4 is a workpiece to be processed, 5 is a reflected light of the laser beam hitting the workpiece 4, 6 is a sensor for measuring the amount of the reflected light, and 7 is a focus for adjusting the focus. An adjusting device, 8 is a horizontal direction driving device that moves the nozzle 1 horizontally with respect to the work 4, 9 is a sensor data storage unit that stores the output from the sensor 6, and 10 is a horizontal direction that stores the coordinates of the horizontal direction driving device 8. A coordinate storage unit 11 is a data analysis unit 12 that analyzes the data of the sensor data storage unit 9 and the horizontal direction coordinate storage unit 10 to estimate the material of the work.
Is a material data storage unit that stores characteristics of each material.

The operation of the numerical control device for a laser beam machine having the above configuration will be described. First, the focus adjustment device 7 performs focus adjustment so that the laser light 3 is focused on the work 4. Next, the horizontal driving device 8 moves the nozzle 1 horizontally with respect to the work 4 by a predetermined distance. At this time, the horizontal coordinate storage unit 10 stores the horizontal coordinate, and the sensor data storage unit 9 stores the sensor data at that time. FIG. 2 shows the relationship between the data in the horizontal coordinate storage unit 10 and the data in the sensor data storage unit 9.

The work 4 has different reflectance and surface roughness depending on the material. Aluminum or the like has a high reflectance and a high surface roughness, so that the average value of the sensor data is high and the rate of change of the sensor data per moving distance is large. Stainless steel has a high reflectance, but the rate of change in sensor data per moving distance is small. Since iron or the like has a low reflectance and a low surface roughness, the average value of the sensor data is low, and the rate of change of the sensor data per moving distance is also low. FIG. 4 shows an example in which the reflectance is high and the surface roughness is large, and when the reflectance is low and the surface roughness is small.

As shown in FIG. 3, the above-mentioned characteristics are obtained in advance in such a manner that the maximum value allowable range, the minimum value allowable range, the average value allowable range, and the change rate of the sensor data per unit moving distance of the sensor data are preliminarily set for each material. Material data storage unit 1
2 is set, and the data analysis unit 11 obtains the maximum value, the minimum value, the average value of the sensor data, and the change rate per moving distance, and compares the material of the work 4 with the data of the material data storage unit 12. presume.

[0015]

As described above, according to the present invention, a sensor for receiving reflected light from a work, a sensor data storage unit, a horizontal coordinate storage unit, a data analysis unit, and a material data storage unit are provided. This makes it possible to estimate the material of the work.

Further, in the machining program in which the material of the workpiece to be machined is determined in advance, the material of the workpiece to be machined is judged by the apparatus of the present invention when the machining program is executed. It is possible to provide a numerical control device for a laser processing machine, which has a function of interrupting machining when it is determined to be different from that of FIG.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a numerical control device for a laser processing machine according to an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a relationship between data in a horizontal coordinate data storage unit and data in a sensor data storage unit in the embodiment.

FIG. 3 is a diagram showing an example of contents stored in a material data storage unit in the embodiment.

FIG. 4 is a graph showing an example of a relationship between horizontal coordinates and sensor data in the same embodiment.

FIG. 5 is a block diagram of a processing condition determination unit of a conventional numerical control device for a laser processing machine.

[Explanation of symbols]

1 Nozzle of laser processing machine 2 Lens for condensing laser 3 Laser 4 Work (workpiece) 5 Reflected light from work 6 Sensor for capturing reflected light 7 Focus adjustment device for adjusting focus 8 Nozzle horizontally Horizontal driving device for driving 9 Sensor data storage unit for storing sensor data 10 Horizontal coordinate storage unit for storing horizontal coordinate of nozzle 11 Analysis based on data of sensor data storage unit, horizontal storage unit Data analysis unit to perform 12 Material data storage unit that stores data for estimating the material of the work

Claims (1)

[Claims] 1. A nozzle having a lens for collecting laser light and a sensor for receiving reflected light from a work, a horizontal drive device for moving the nozzle horizontally with respect to the work, and a focus adjustment of the lens. A focus adjustment device for performing, a material data storage unit that stores data for estimating the material of the work, a sensor data storage unit that stores data from the sensor, and horizontal coordinates that store the coordinates of horizontal nozzles. A laser including a storage unit, and a data analysis unit that analyzes the data of the sensor data storage unit and the data of the horizontal direction coordinate storage unit and estimates the material of the work by comparing with the data of the material data storage unit. Numerical control device for processing machines.