Intelligent control system and method for laser cutting machine for machining aluminum castingsTechnical Field
The invention relates to the technical field of electronics and laser, in particular to an intelligent control system and method for a laser cutting machine for machining aluminum castings.
Background
One of the advantages of the laser cutting process is the complexity of design and the large material loss, which makes it different from other processes. The laser cutting system can easily process various difficult-to-cut materials such as brass, diamond, aluminum and various composite materials. The laser cutting machine focuses the laser emitted from the laser device into a laser beam with high power density through the optical path system, the laser beam irradiates the surface of the workpiece to enable the workpiece to reach a melting point or a boiling point, meanwhile, the molten or gasified metal is blown away by high-pressure gas coaxial with the laser beam, and the material finally forms a cutting seam along with the movement of the relative position of the laser beam and the workpiece, so that the purpose of cutting is achieved.
But some aluminium juice can fall on laser cutting machine's support flat board, for safe and clear away solidification aluminium fast, consequently this paper research and development avoid cutting precision inaccurate, conveniently get the long-range intelligent control system of laser cutting machine based on thing networking laser microjet of material, can conveniently control and reach higher precision. And a water jet guided laser ablation is adopted, which has advantages of no focus adaptive narrow parallel cutting wall, minimized heat affected zone by water cooling, and avoiding burr generation due to constant water flow.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses an intelligent control system and method for a laser cutting machine for processing aluminum castings, which are used for solving the problems.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides an intelligent control method for a laser cutting machine for machining an aluminum casting, which comprises the following steps:
the method comprises the following steps that S1, a system is electrified to work, instruction parameters are set through Internet of things communication, and an aluminum casting enters a laser cutting field;
s2, calibrating parameters of the center position of the laser cutting machine to obtain a CCD image, and obtaining the position parameters of the aluminum casting after image processing;
s3, carrying out space coordinate transformation on the position parameters of the aluminum casting by using space analytic geometry to obtain a cutting line equation expressed by a parameter equation, and further establishing a mathematical model;
s4, inputting the parameter geometric information of the aluminum casting, and obtaining discrete data by using a computer to obtain the running track of the aluminum casting;
s5, feeding back the detection information of the detection sensor and the running track in S4 to the control system, and starting the cutting system to work;
and S6, after cutting, closing the cutting system, transmitting the data to the remote control terminal through the Internet of things communication network, and controlling the clearing system to finish clearing finally.
Furthermore, in the method, when the round pipe and the square pipe are offset and obliquely crossed, the radius of the round pipe is R, the side length of the square pipe is a, the intersection angle of the two pipes is alpha, the offset distance is e, and OO' is a common perpendicular line of the axes of the round pipe and the square pipe; respectively establishing a circular tube coordinate system O-XYZ and a square tube coordinate system O ' -X ' Y ' Z ' by taking the straight line where the axis of the circular tube is positioned as an X axis and the straight line where the axis of the square tube is positioned as an X ' axis;
performing coordinate system transformation, and rotating the circular tube coordinate system around Y axis clockwise by alpha to obtain O1 -X1 Y1 Z1 Coordinate system, homogeneous coordinate transformation matrix is A1 ;
Mixing O with1 -X1 Y1 Z1 Translating the coordinate system in the positive Y1 direction to obtain O2 -X2 Y2 Z2 Coordinate system, corresponding transformation matrix being A2 ;
Mixing O with2 ,X2 Y2 Z2 Coordinate system around X2 The axis rotates clockwise by 45 degrees to obtain an O '-X' Y 'Z' coordinate system, and the corresponding transformation matrix is A3 ;
If the homogeneous coordinate transformation matrix is A when the circular tube coordinate system is transformed into the square tube coordinate system, the homogeneous coordinate transformation matrix is
(x' y' z' 1)=(x y z 1)A
Obtaining a transformation matrix A 'converted from a square tube coordinate system to a circular tube coordinate system'
(x y z 1)=(x' y' z' 1)A'
Furthermore, in the method, when the intersecting line equation is solved, the master rectangular coordinate equation is as follows:
y2 +z2 =R2
the rectangular coordinate equation of the branch pipe is as follows:
projecting the main pipe with the radius R in the YOZ plane to obtain a main pipe parameter equation as follows:
wherein theta is an included angle from the positive semi-axis of the Y axis to the projection point in the anticlockwise rotation mode.
Furthermore, in the method, the aluminum casting is placed on the feeding frame, the remote control terminal transmits the instruction parameters to the field control panel through the internet of things communication network, the field control panel enables the electric push rod to work accordingly, the aluminum casting is moved to the inner side of the cutting system, when the feeding frame moves leftwards and touches the positioning sensor, the positioning sensor transmits information back to the field control panel, the field control panel controls the electric push rod to reset and close accordingly, and at the moment, the aluminum casting is limited to move rightwards through the matching of the reset spring and the baffle.
Furthermore, in the method, the remote control terminal transmits the instruction parameters to the field control panel through the internet of things communication network, the field control panel transmits the instruction to the positive and negative module, the positive and negative module starts the outer rotor motor to work, and the outer rotor motor works to adjust the cutting system.
The method is further characterized in that after the aluminum casting is placed inside the cutting system, the remote control terminal transmits instruction parameters to the field control panel through the internet of things communication network, the field control panel then transmits instructions to the control module, the control module then enables the detection sensor to work according to the instructions, the detection sensor works to detect the aluminum casting on the cutting system, after the aluminum casting is detected, the detection sensor then feeds information back to the control module, the control module then starts the cutting system to work according to the fed information, and the cutting system works to cut the aluminum casting.
Furthermore, in the method, a water jet guided laser system is used for cutting, a water jet is moved to a reference position, a laser spot is detected on the surface of a nozzle, and then the laser spot is accurately aligned to the nozzle to perform accurate cutting operation; and after the aluminum castings are completely cut and processed, the on-site control panel closes the cutting system, and transmits the data to the remote control terminal through the Internet of things communication network.
Furthermore, in the method, after all the aluminum castings are cut and processed, command parameters are transmitted to a field control panel through an internet of things communication network through a remote control terminal, the field control panel enables a sundry removing system to work according to the transmitted commands, the sundry removing system works to remove solidified aluminum generated during cutting of the aluminum castings, meanwhile, the cut aluminum castings are moved to the sundry removing system, after the cleaning is completed, the field control panel enables the cutting system to reset and close, the field control panel enables a fan assembly to work according to the transmitted commands, the fan assembly extracts outside air accordingly and discharges the air leftwards through an air outlet pipe, and the cleaned sundries are blown and accumulated leftwards.
In a second aspect, the invention provides an intelligent control system for a laser cutting machine for processing aluminum castings, which is used for realizing the intelligent control method for the laser cutting machine for processing aluminum castings, and comprises the steps of
The motion control part is used for receiving a control instruction, controlling the workbench to return to zero, converting the motion of the machine tool under a coordinate system and the motion of the workpiece under the coordinate system, and acquiring the absolute coordinate and the relative coordinate of the workbench to move along a single-segment straight line and a single-segment circular arc track;
the sundries removing part is used for cleaning solidified aluminum generated during cutting of the aluminum casting, extracting external air along with the solidified aluminum through the fan assembly, and discharging the air leftwards through the air outlet pipe to blow and accumulate the removed sundries leftwards;
and the laser cutting part carries out image recognition on laser spots on the surface of the water spray nozzle through an integrated camera of an optical element in the optical lens so as to carry out accurate cutting operation.
Furthermore, the motion control part comprises a remote control terminal, an Internet of things communication network, a field control panel and a control module;
the sundries removing part comprises an electric push rod and a fan assembly;
the laser cutting part comprises a positive and negative module, a servo motor, a CCD camera, a detection sensor and a laser cutting machine.
The invention has the beneficial effects that:
according to the method, through mathematical modeling of the cutting track, the intersecting line geometric information can be conveniently utilized to obtain intersecting line groove data, so that the method is applied to laser cutting processing, and high real-time data processing, high motion control processing speed and strong expandability of the laser cutting of the profiled bars are realized.
According to the invention, the cutting system is used for cutting and processing the cast aluminum parts, and the impurity removing system is used for removing the solidified aluminum generated after melting and solidifying during laser cutting, so that inaccuracy caused by subsequent cutting and processing precision is avoided; and the Internet of things is adopted for control, so that manual participation is reduced. And the cutting precision of the aluminum casting is improved by adopting a laser micro-jet method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the steps of an intelligent control method of a laser cutting machine for processing aluminum castings;
FIG. 2 is an offset skew drawing of a round tube-square tube according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of an intelligent control system of a laser cutting machine for processing aluminum castings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the embodiment provides an intelligent control method for a laser cutting machine for machining an aluminum casting, which includes the following steps:
the method comprises the following steps that S1, a system is electrified to work, instruction parameters are set through Internet of things communication, and an aluminum casting enters a laser cutting field;
s2, calibrating parameters of the center position of the laser cutting machine to obtain a CCD image, and obtaining the position parameters of the aluminum casting after image processing;
s3, carrying out space coordinate transformation on the position parameters of the aluminum casting by using space analytic geometry to obtain a cutting line equation expressed by a parameter equation, and further establishing a mathematical model;
s4, inputting the parameter geometric information of the aluminum casting, and obtaining discrete data by using a computer to obtain the running track of the aluminum casting;
s5, feeding back the detection information of the detection sensor and the running track in S4 to the control system, and starting the cutting system to work;
and S6, after cutting, closing the cutting system, transmitting the data to the remote control terminal through the Internet of things communication network, and controlling the clearing system to finish clearing finally.
The remote intelligent control system of the laser cutting machine based on the laser micro-jet of the internet of things, which avoids inaccurate cutting precision and convenient material taking, can be conveniently controlled and achieves higher precision. And a water jet guided laser ablation is adopted, which has advantages of no focal point adaptive narrow parallel cutting wall, minimized heat affected zone by water cooling, and avoiding burr generation due to constant water flow.
Example 2
On the basis of embodiment 1, the present embodiment provides a mathematical modeling method for a cutting trajectory, specifically, as shown in fig. 2, when a circular tube and a square tube are obliquely offset, a radius of the circular tube is set to be R, a side length of the square tube is set to be a, an intersection angle between the two tubes is set to be α, an offset distance is set to be e, and OO' is a common perpendicular line between axes of the circular tube and the square tube; respectively establishing a circular tube coordinate system O-XYZ and a square tube coordinate system O ' -X ' Y ' Z ' by taking the straight line where the axis of the circular tube is positioned as an X axis and the straight line where the axis of the square tube is positioned as an X ' axis;
performing coordinate system transformation, and rotating the circular tube coordinate system around Y axis clockwise by alpha to obtain O1 -X1 Y1 Z1 Coordinate system, homogeneous coordinate transformation matrix is A1 ;
Mixing O with1 -X1 Y1 Z1 Translating the coordinate system in the positive Y1 direction to obtain O2 -X2 Y2 Z2 Coordinate system, corresponding transformation matrix being A2 ;
Mixing O with2 ,X2 Y2 Z2 Coordinate system around X2 The shaft rotates clockwise by 45 degreesObtaining an O '-X' Y 'Z' coordinate system, and the corresponding transformation matrix is A3 ;
If the homogeneous coordinate transformation matrix is A when the circular tube coordinate system is transformed into the square tube coordinate system, the homogeneous coordinate transformation matrix is
(x′ y′ z′ 1)=(x y z 1)A
Obtaining a transformation matrix A 'converted from a square tube coordinate system to a circular tube coordinate system'
(x y z 1)=(x′ y′ z′ 1)A′
In this embodiment, when solving the intersecting line equation, the principal rectangular coordinate equation is:
y2 +z2 =R2
the rectangular coordinate equation of the branch pipe is as follows:
projecting the main pipe with the radius R in the YOZ plane to obtain a main pipe parameter equation as follows:
wherein theta is an included angle from the positive semi-axis of the Y axis to the projection point in the anticlockwise rotation mode.
According to the method, the intersecting line groove data can be obtained by conveniently utilizing the geometric information of the intersecting line through mathematical modeling of the cutting track, so that the method is applied to laser cutting processing, and high real-time data processing, high motion control processing speed and high expandability of the laser cutting of the profiled bars are realized.
Example 3
In a specific implementation level, the embodiment provides an intelligent control method of a laser cutting machine for processing an aluminum casting based on an internet of things laser micro-jet, and the method specifically includes the following steps:
1. firstly, an aluminum casting is placed on a feeding frame, instruction parameters are transmitted to a field control panel through an internet of things communication network through a remote control terminal, the field control panel enables an electric push rod to work accordingly, the aluminum casting is moved to the inner side of a cutting system, when the feeding frame moves leftwards and touches a positioning sensor, the positioning sensor transmits information back to the field control panel, the field control panel controls the electric push rod to reset and close accordingly, and at the moment, the aluminum casting is limited by the matching of a reset spring and a baffle plate when moving rightwards.
2. The remote control terminal transmits the instruction parameters to the field control panel through the Internet of things communication network, the field control panel transmits the instruction to the positive and negative modules, the positive and negative modules start the external rotor motor to work, and the external rotor motor works to adjust the cutting system, so that the aluminum castings with different sizes can be conveniently placed and subjected to subsequent cutting processing;
3. when the aluminum casting is placed inside the cutting system, the instruction parameters are transmitted to a field control panel through a remote control terminal through an internet of things communication network, the field control panel transmits the instruction to a control module, the control module enables a detection sensor to work according to the instruction, the detection sensor works to detect the aluminum casting on the cutting system, when the aluminum casting is detected, the detection sensor feeds information back to the control module, the control module starts the cutting system to work according to the fed information, the cutting system works to cut the aluminum casting, and the most advanced technology of the water jet guided laser system comprises the step of automatically aligning laser through a water jet nozzle. This is achieved by motorization of the optics in the optical lens, the auto-alignment system using an integrated camera for image recognition of the laser spot on the surface of the water jet nozzle, which images the nozzle with a resolution of 1 μm. The water jet is moved to a reference position, a laser spot is detected on the surface of the nozzle, and then the laser spot is precisely aligned with the nozzle to perform a precise cutting operation. After the aluminum castings are completely cut and processed, the on-site control panel closes the cutting system, and transmits data to the remote control terminal through the Internet of things communication network;
4. when all the aluminum castings are cut and processed, transmitting instruction parameters to a field control panel through an internet of things communication network through a remote control terminal, enabling a sundries removing system to work according to the transmitted instructions by the field control panel, enabling the sundries removing system to clean solidified aluminum generated during cutting of the aluminum castings, enabling the cut aluminum castings to move onto the sundries removing system, and enabling the cutting system to reset and close by the field control panel after cleaning is completed;
5. the remote control terminal transmits the instruction parameters to the field control panel through the Internet of things communication network, the field control panel enables the fan assembly to work according to the transmitted instruction, the fan assembly extracts outside air and discharges the air leftwards through the air outlet pipe, and the cleaned sundries are blown leftwards and stacked, so that subsequent treatment is facilitated.
In the embodiment, the cutting system is used for cutting and processing the cast aluminum parts, and the impurity removing system is used for removing the solidified aluminum generated after melting and solidifying in the laser cutting process, so that the inaccuracy caused by the subsequent cutting and processing precision is avoided; and the Internet of things is adopted for control, so that manual participation is reduced. The cutting precision of the aluminum casting is improved by adopting a laser micro-jet method.
Example 4
In another aspect, referring to fig. 3, the embodiment provides an intelligent control system for a laser cutting machine for processing aluminum castings, comprising
The motion control part is used for receiving a control instruction, controlling the workbench to return to zero, converting the motion of the machine tool under a coordinate system and the motion of the workpiece under the coordinate system, and acquiring the absolute coordinate and the relative coordinate of the workbench to move along a single-segment straight line and a single-segment circular arc track;
the sundries removing part is used for cleaning solidified aluminum generated during cutting of the aluminum casting, extracting external air along with the solidified aluminum through the fan assembly, and discharging the air leftwards through the air outlet pipe to blow and accumulate the removed sundries leftwards;
and the laser cutting part carries out image recognition on laser spots on the surface of the water spray nozzle through an integrated camera of an optical element in the optical lens so as to carry out accurate cutting operation.
The motion control part of the embodiment comprises a remote control terminal, an Internet of things communication network, a field control panel and a control module.
The sundries removing part comprises an electric push rod and a fan assembly.
The laser cutting part of the embodiment comprises a positive and negative module, a servo motor, a CCD camera, a detection sensor and a laser cutting machine.
In conclusion, the method can conveniently utilize the geometric information of the intersecting line to obtain the groove data of the intersecting line through mathematical modeling of the cutting track, so that the method is applied to laser cutting processing, and further realizes high real-time data processing, high motion control processing speed and strong expandability of the laser cutting of the profiled bars.
According to the invention, the cutting system is used for cutting and processing the cast aluminum parts, and the impurity removing system is used for removing the solidified aluminum generated after melting and solidifying during laser cutting, so that inaccuracy caused by subsequent cutting and processing precision is avoided; and the Internet of things is adopted for control, so that manual participation is reduced. And the cutting precision of the aluminum casting is improved by adopting a laser micro-jet method.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.