RU2599920C2 - Control device for laser thermal strengthening process - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: invention relates to a control device foe laser thermal strengthening process. Control is provided with further parameters correction of a reinforced part layer in real time to increase processing quality. Device has a double-circuit control system: temperature stabilization circuit on processing object surface and a reinforced layer parameters correction circuit. Device comprises a controller for setting parameters of the reinforced layer, a controller for forming processing parameters, forming control signals for radiation source power control and controllers of the rate of drives of beam guide movable links movement, beam guide heats the treated surface by laser beam, a temperature sensor connected to the functional converter FC1 forming correcting signals at rate controllers. Intelligent reinforced layer parameters identifier forms correcting signals for reinforced layer parameters controller by means of functional converter FC3 based on data, obtained from the controller for forming processing parameters, from the temperature sensor through a function converter FC2 and from the heating model unit.

EFFECT: heating model is generated based on data received from the temperature sensor and controller for forming processing parameters.

1 cl, 1 dwg

Description

Technical field

The invention relates to the field of metal processing by a laser beam, in particular, to controlling a process of laser thermal hardening.

State of the art

A known device for controlling the process of laser hardening of a material, comprising a laser radiation source, an infrared radiation receiver with a light filter at the input and an electric signal amplifier at the output, connected to a microprocessor, an actuator controller, the first output of which is connected to a power supply unit connected to the laser radiation source, and input - to the first output of the microprocessor, and the operator control panel associated with the first two-way communication with the controller of the actuators, reception infrared radiation nickel made in the form of a multi-element linear photodetector for measuring the surface temperature distribution along the line of sight located on the surface of the material behind the point of influence of the laser beam in the direction of movement and perpendicular to the processing path, and mounted on an optical head optically coupled to the laser radiation source (RU 110669 U1 according to class B23K 26/02 from 07/29/2011).

The disadvantage of this device is that to control the parameters of the processed surface, instantaneous temperature values are determined in the cross section of the heating spot. At the same time, the process of laser thermal hardening of the surface occurs by heating and cooling the metal in the direction of movement of the light spot. Therefore, to improve the quality of laser thermal hardening, it is necessary to determine the depth and hardness of the hardened layer by analyzing the thermal cycle that occurs in the metal in real time.

Disclosure of invention

The objective of the invention is to increase the productivity and quality of the process of laser thermal hardening.

The problem is solved due to the fact that, in contrast to the known technological solution, the process control device for laser thermal hardening contains a correction circuit for the parameters of the hardened layer, which provides the required quality of the process flow based on the analysis of the temperature cycle of the effect of laser radiation on the material of the processed object in real time .

Description of drawings

The figure shows a structural diagram of a dual-circuit process control system for laser thermal hardening.

The implementation of the invention

The laser thermal hardening technological process control device comprises a controller for setting the parameters of the hardenable layer 1, a controller for the parameters of the hardenable layer 2, a controller for generating technological processing parameters 3, a power controller 4, a radiation source (laser) 5, speed controllers 6, moving link drives of the beam path 7, a beam path 8, processing object 9, temperature sensor 10, functional converter (FP1) 11, model of the heating process 12, functional converter (FP2) 13, intelligent the identifier of the parameters of the hardened layer 14, the functional Converter (FP3) 15.

The device operates as follows.

The controller for setting the parameters of the hardened layer 1 sets the initial data for the controller of the parameters of the hardened layer 2, from which the data are sent to the controller for the formation of technological processing parameters 3, where control signals are generated for the power controller 4 of the radiation source (laser) 5 and speed regulators 6 of the drives 7 for moving 7 drives links of the beam line 8.

During the process of laser exposure to the processing object 9, the temperature sensor 10 measures the heating parameters of the treated surface. The surface heating temperature in the treatment zone has a functional relationship with the processing speed. In the functional converter (FP1) 11, the surface heating temperature is converted to the processing speed; here, the initial speed specified in the controller for the formation of technological processing parameters 3 and the speed required depending on the readings of the temperature sensor 10 during the laser processing are subtracted. The error in speed obtained as a result of the transformations is fed to the speed controllers 6 for moving the movable links of the beam path.

At the same time, information from the temperature sensor 10 enters the heating process model block 12 to build a reference computer model of thermal transformations in the metal. Intelligent identifier 14, processing with the help of a functional converter (FP2) 13, data from a temperature sensor 10, models of the heating process 12, a given processing speed and radiation power, generates correction data that is processed in a functional converter (FP3) 15. Further, the information goes to the controller hardened layer 2 parameters for changing the technological task.

Claims (1)

A device for controlling the process of laser thermal hardening, comprising a controller for setting parameters of the hardened layer, a controller for generating technological processing parameters that generates control signals for the radiation source power controller and for speed controllers of the drives for moving the movable links of the laser beam path for heating the surface to be treated, a temperature sensor associated with functional converter FP1, forming corrective signals to the aforementioned speed regulators, characterized in that it contains an intelligent identifier of the parameters of the hardened layer, which generates correction signals supplied to the controller of the parameters of the hardened layer using the FP3 functional converter based on data received from the controller for generating technological processing parameters, the temperature sensor through the FP2 functional converter and the unit models of the heating process generated on the basis of data obtained from the temperature sensor and the formation controller technological parameters of processing.

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