A method of controlling the cutting of a section steel

Abstract

This invention provides a method for controlling the cutting of structural steel. Based on the cross-sectional characteristics of the steel section to be cut, the method identifies the cutting condition, determines the corresponding sub-cutting process in the process library, and controls the cutting mechanism to execute the cutting operation according to the selected sub-cutting process. If it is determined that the process library does not store a sub-cutting process corresponding to the condition, the method controls the cutting mechanism to execute the cutting operation according to real-time adjusted process parameters. The process parameters corresponding to the sub-cutting process of the condition are recorded and saved, and the process library is updated. This invention achieves real-time communication with the power supply and height adjustment device, enabling precise online real-time process control during the cutting process. Targeted cutting processes are used on different surfaces and positions of the structural steel to improve the cutting effect. Simultaneously, it can achieve integrated cutting and marking, essentially replacing the work of riveters.

Description

Technical Field

[0001] This invention relates to the field of steel profile cutting, and more particularly to a method for controlling steel profile cutting. Background Technology

[0002] Currently, during the steel section cutting process, workers usually need to manually adjust the cutting parameters depending on the type of steel being cut. This results in a significant impact from human factors, leading to variations in the kerf width and kerf formation effect each time, making it impossible to precisely control the cutting dimensions and resulting in unstable cutting results. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a steel profile cutting control method that enables precise online real-time process control during cutting, solving the technical problem of unstable cutting results and inability to accurately control cutting size and effect due to manual adjustment.

[0004] A method for controlling the cutting of structural steel involves identifying the cross-sectional characteristics of the structural steel to be cut, determining the cutting process corresponding to the structural steel in the process library, controlling the cutting mechanism to perform the cutting operation according to the selected cutting process, and if it is determined that the cutting process corresponding to the structural steel to be cut is not stored in the process library, controlling the cutting mechanism to perform the cutting according to the sub-cutting process selected in real time, recording and saving the process parameters corresponding to the cutting process of the structural steel to be cut, and updating the process library.

[0005] Furthermore, the cutting mechanism is controlled to perform cutting according to the sub-cutting process selected in real time. This includes identifying the working condition to be cut based on the cross-sectional characteristics of the steel to be cut, determining the sub-cutting process corresponding to the working condition in the process library, controlling the cutting mechanism to perform the cutting operation according to the selected sub-cutting process, and if it is determined that the sub-cutting process corresponding to the working condition is not stored in the process library, the cutting mechanism is controlled to perform the cutting operation according to the process parameters adjusted in real time, the process parameters corresponding to the sub-cutting process of the working condition are recorded and saved, and the process library is updated.

[0006] Furthermore, the process involves determining the sub-cutting process in the process library that corresponds to the stated working condition, and controlling the cutting mechanism to perform a cutting operation according to the selected sub-cutting process, including at least one of the following execution methods:

[0007] The cutting condition to be performed is a simple planar cutting, and the cutting mechanism is controlled to perform the cutting operation according to the conventional cutting process;

[0008] The cutting condition to be performed is the cutting of a surface with a thinning thickness. The cutting mechanism is controlled to perform the cutting operation according to the thin surface transition process.

[0009] The cutting conditions to be performed are rounded corner surfaces, corner surfaces, and flat surfaces with varying thicknesses. The cutting mechanism is controlled to perform the cutting operation according to the corner transition process.

[0010] The cutting condition to be performed is the cutting of the surface that needs to be beveled. The cutting mechanism is controlled to perform the cutting operation according to the bevel cutting process.

[0011] The cutting conditions to be performed are the cutting of rounded corners, corners, and planes with varying thicknesses in the bevel of the steel profile. The cutting mechanism is controlled to perform the cutting operation according to the bevel corner process.

[0012] The cutting condition to be performed is the cutting of holes on various surfaces of the steel profile. The cutting mechanism is controlled to perform the cutting operation according to the hole cutting process.

[0013] The cutting condition to be performed is marking, and the cutting mechanism is controlled to perform the cutting operation according to the marking process.

[0014] Preferably, the cutting mechanism is a plasma cutting mechanism or a laser cutting mechanism.

[0015] Preferably, the cross-sectional characteristics of the steel to be cut are obtained through manual input or online recognition.

[0016] Preferably, the online identification unit includes a sensor and a signal identification unit. The sensor is mounted on the steel section to be cut and is transported along with the steel section on the guide rail. The signal identification unit is communicatively linked with the controller. The signal identification unit reads the signal from the sensor, obtains the cross-sectional characteristics of the steel section, and transmits the obtained cross-sectional characteristics to the controller.

[0017] Preferably, the online identification unit measures the dimensions of the profile after online monitoring to obtain the kerf size, and the PID algorithm is used to perform real-time dynamic compensation for the kerf size of the steel profile.

[0018] Preferably, the process parameters of the cutting process corresponding to the working condition are obtained, including system-recommended parameters or system-automatically given parameters.

[0019] Furthermore, the process parameters for the cutting process corresponding to the working condition are obtained, including selecting a suitable cutting gas and cutting pressure, and selecting a suitable protective gas and protective pressure; determining whether the positioning enable and arc ignition success are turned on; determining the positioning of the cutting torch and the arc ignition height according to the set status; and completing the piercing action after reaching the set piercing time; performing cutting using a preset cutting current after piercing; and turning the plasma arc voltage adjustment function on or off during the cutting process according to the definition of the height adjustment enable; turning off the arc after cutting and performing an upward movement according to the defined upward height to avoid collisions when the cutting torch moves.

[0020] Furthermore, when cutting through holes inside the material, the arc initiation success signal must be a complete arc initiation success. When cutting the material edge, as long as a small arc success is achieved, it can be considered an arc initiation success. At the same time, the edge part of the material being cut is completely shut down by the plasma arc voltage adjustment function and is not controlled by the adjustment enable.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention enables real-time communication with the power supply and height adjustment device, allowing for precise online control of the cutting process. Targeted processes are applied to different surfaces and locations of the steel profile to improve cutting quality. Simultaneously, cutting and scribing are completed in one step, essentially replacing the work of a riveter. Furthermore, by creating a process library, existing cutting files can be directly called when cutting steel profiles of the same specifications again, eliminating the need for repeated real-time parameter adjustments, thus improving cutting efficiency and ensuring consistent cutting results. Attached Figure Description

[0023] Figure 1 This is a flowchart of the steel section cutting control method of the present invention;

[0024] Figure 2 This is a schematic diagram of the sub-cutting process selection flow in the steel section cutting control method of the present invention;

[0025] Figure 3 This is a schematic diagram of the process for determining successful arc initiation in the steel cutting control method of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] A method for controlling the cutting of structural steel includes the following steps: identifying the cross-sectional characteristics of the structural steel to be cut, determining the cutting process corresponding to the structural steel in the process library, and controlling the cutting mechanism to execute cutting according to the selected cutting process. Further, if it is determined that no cutting process corresponding to the structural steel is stored in the process library, the cutting mechanism is controlled to execute cutting according to a sub-cutting process selected in real time.

[0030] Furthermore, for a specific type of steel profile, after one cut is completed, the controller can generate a cutting file based on the sub-cutting processes and cutting parameters executed during the cutting process, and store it in memory. When the controller determines that the specific type of steel profile has been cut before based on the cross-sectional characteristics of the steel to be cut, it can directly call the cutting file in memory without having to select the cutting process again.

[0031] Furthermore, the steel section cutting control method of this application also includes statistical analysis of the recorded processing information and displaying it according to a preset period. The preset period can be daily, weekly, or yearly. The display methods include, but are not limited to, charts, graphs, etc., and historical records for a specific day and time can be queried as needed. The statistical processing information includes, but is not limited to, actual cutting working time, gas consumption, electricity consumption, and number of parts cut.

[0032] Example 1

[0033] Figure 1 A flow chart of a steel section cutting control method is shown, including the following steps:

[0034] S100 identifies the cross-sectional characteristics of the steel section to be cut.

[0035] There are various types of commonly used steel profiles, such as H-beams, square tubes, round tubes, channel steel, and angle steel. The steel profile cross-sectional features of this invention are used to describe the cross-sectional shape of the steel profile, determine the steel profile type, and control the selection and determination of process parameters in the corresponding sub-cutting process. Cross-sectional features include, but are not limited to, steel profile model, type, different surface dimensions (diameter), transition corners, bevels, and steel profile thickness.

[0036] Preferably, the present invention allows operators to manually input the cross-sectional features of the steel to be cut; or to import a workpiece model in a specified file format from a dedicated modeling system such as CAD / CAM to obtain the workpiece cross-sectional features.

[0037] Furthermore, the present invention can identify the cross-sectional characteristics of the steel to be cut online.

[0038] Specifically, the steel section cutting system of the present invention also includes an online identification unit for online identification of each type of steel section to be cut. For example, the online identification unit includes an industrial camera for acquiring the cross-sectional characteristics of the steel section. The industrial camera is disposed on the side of the guide rail used to transport the steel section. One or two industrial cameras may be provided.

[0039] Preferably, the online recognition unit of this application can also monitor the profile dimensions online through visual measurement and correct the profile dimensions, thereby correcting the deviation of the profile dimensions that are manually entered or imported from the CAD / CAM system, and achieving accurate cutting.

[0040] Furthermore, the online recognition unit of this application can also monitor the dimensions of the profile after cutting through visual measurement to obtain the kerf size, and perform real-time dynamic compensation for the kerf size of the steel profile cutting through a PID algorithm.

[0041] Optionally, the online identification unit includes a sensor and a signal identification unit. The sensor is mounted on the steel section to be cut and moves along with it on a linear guide rail. The signal identification unit is communicatively linked to the controller, reads the sensor signals, acquires the cross-sectional characteristics of the steel section, and transmits the acquired cross-sectional characteristics to the controller.

[0042] The sensor can be a laser sensor or a radio frequency identification (RFID) tag, and the corresponding signal identification unit can be a laser receiver or a radio frequency detection device.

[0043] S200: Determine the cutting process in the process library that corresponds to the steel section to be cut.

[0044] The steel section cutting control method of the present invention allows the controller to compare the acquired cross-sectional features with a pre-stored steel section model to determine the steel section specifications, and to search the process library for a corresponding cutting process for the steel section to be cut, and then execute the corresponding cutting process.

[0045] If no cutting process corresponding to the steel section to be cut is found in the process library, the control cutting mechanism executes the sub-cutting process for each working condition according to the cross-sectional characteristics, specifically as follows: Figure 2 As shown.

[0046] Furthermore, in the steel section cutting control method of the present invention, for steel sections for which no cutting process is found, after the user selects the corresponding sub-cutting process under the corresponding working condition according to the cross-sectional characteristics and completes the cutting, and is satisfied with the cutting effect, the cutting process corresponding to this cutting can be stored in the memory as a complete cutting file, and the process library can be updated so that the cutting process can be directly called when cutting steel sections of the same specification next time.

[0047] S300: Determine the sub-cutting process in the process library that corresponds to the feature of the section to be cut, and control the cutting mechanism to perform the cutting operation according to the selected sub-cutting process.

[0048] The steel section cutting control method of the present invention provides different sub-cutting processes corresponding to different working conditions, thereby enabling automatic selection of different sub-cutting processes for cutting based on different surfaces of the steel section. Specifically, when a working condition corresponding to the characteristics of the section to be cut is retrieved from the process library, the plasma cutting mechanism is controlled to execute the cutting according to the sub-cutting process corresponding to the selected working condition.

[0049] When controlling the cutting mechanism to execute sub-cutting processes for each working condition according to the cross-sectional features, the user can select the sub-cutting process corresponding to each working condition on the user interface. Alternatively, the controller can first identify the working condition corresponding to each cross-sectional feature based on the received cross-sectional features or nesting file, call the sub-cutting process corresponding to the working condition from the process library stored in the memory, and use it to control the cutting mechanism to perform the cutting operation.

[0050] The cutting mechanism of this application includes a height adjustment mechanism, a gas control device, and a cutting torch. The controller can adjust the cutting parameters of the cutting mechanism, such as cutting speed, positioning height, gas flow rate, and current, according to different sub-cutting process requirements. Optionally, the cutting mechanism of this application can be a plasma cutting mechanism or a laser cutting mechanism.

[0051] Optionally, the present invention provides a conventional cutting process for application to the cutting of simple planes in structural steel;

[0052] Optionally, the present invention provides a thin-surface transition process for use in cutting surfaces where the thickness of the steel profile decreases;

[0053] Optionally, the present invention provides a corner transition process for use in the cutting of rounded corners, corners, and planes with varying thicknesses in steel profiles.

[0054] Optionally, the present invention provides a bevel cutting process for use in cutting surfaces that require bevel cutting;

[0055] Optionally, the present invention provides a beveling corner process for cutting rounded corners, corners, and planes with varying thicknesses in steel profile beveling.

[0056] Optionally, the present invention provides a hole-cutting process for use in cutting small holes on ordinary surfaces of structural steel.

[0057] Optionally, the present invention provides a thin-surface hole-cutting process for use in cutting small holes on thin surfaces of structural steel, such as the web surface of H-beams.

[0058] Alternatively, the present invention also provides a marking process for scribing on the surface of steel profiles.

[0059] This invention enables real-time communication with the power supply and height adjustment device, allowing for precise online control of the cutting process. Targeted processes are applied to different surfaces and locations of the steel profile to improve cutting quality. Simultaneously, cutting and scribing are completed in one step, essentially replacing the work of a riveter. Furthermore, by creating a process library, existing cutting files can be directly called when cutting steel profiles of the same specifications again, eliminating the need for repeated real-time parameter adjustments, thus improving cutting efficiency and ensuring consistent cutting results.

[0060] Taking a plasma cutting mechanism as an example, the specific process parameters of each sub-cutting process stored in the memory include, but are not limited to, cutting gas, shielding gas, cutting gas pressure, shielding gas pressure, arc ignition height, dynamic piercing, piercing time, lifting height, positioning enable, successful arc ignition, cutting current, height adjustment enable, and cutting arc pressure height. These process parameters can be automatically switched according to the selected cutting process during the cutting process, thereby avoiding the inefficiency of manual parameter adjustment and the potential for inconsistent cutting results.

[0061] Furthermore, the process parameter values ​​corresponding to each sub-cutting process can be obtained through any of the following methods.

[0062] Optionally, the process parameters for each sub-cutting process can be set by the user and saved to the corresponding cutting process in the process library. When the same sub-cutting process is used again, it can be directly called. For example, it can be stored in the memory in the form of a parameter table, which can be directly called by the corresponding sub-cutting process through a table lookup. Alternatively, the user can set the parameters through the user interface each time a new sub-cutting process is executed and store them in the memory for repeated use.

[0063] Optionally, the system can recommend process parameter values ​​through the system recommendation function. After user confirmation, the sub-cutting process can be executed. These process parameter values ​​can be saved to the corresponding sub-cutting process in the process library and can be directly called when the same sub-cutting process is used again.

[0064] Furthermore, when the system automatically assigns parameters, the user can define the standard adjustment range of the process parameter values ​​and the relationship between process parameters under different working conditions. After this function is enabled, the system will automatically assign parameters within the range set by the user to meet the cutting needs of different working conditions without user intervention, thus achieving automatic cutting.

[0065] Specifically, the system recommends parameters and automatically assigns parameters in the following ways: In the initial stage, the system pre-sets a set of process algorithms based on experience values ​​to determine process parameter values ​​according to the workpiece shape and size obtained from the CAD / CAM system; After long-term use, the system compares the user-defined process parameter values ​​with the system's built-in process algorithm based on collected records, learns the user's parameter usage habits, and after obtaining a certain sample size, corrects the recommended values ​​of the system's built-in process algorithm to make them closer to the parameters set by the user.

[0066] S400: If it is determined that the process library does not store the working condition corresponding to the cross-sectional features to be cut, the plasma cutting mechanism is controlled to perform cutting according to the real-time adjusted process parameters, the process parameters corresponding to the working condition are recorded and saved, and the process library is updated.

[0067] Specifically, when the plasma cutting mechanism is controlled to perform cutting according to the real-time adjusted process parameters, the execution process is as follows:

[0068] S410: Select the appropriate cutting gas and cutting pressure, and select the appropriate protective gas and protective pressure.

[0069] Preferably, the main cutting gas used for cutting is one of air, oxygen, carbon dioxide, nitrogen, argon, or a mixture thereof, with a cutting gas pressure range of approximately 0.2-1.0 MPa. The auxiliary gas used during the cutting process is also one of air, oxygen, carbon dioxide, nitrogen, argon, or a mixture thereof, with a protective gas pressure range of approximately 0.2-1.0 MPa.

[0070] S420: Determine whether positioning enable and arc initiation success are turned on. Based on the set status, determine the positioning of the cutting torch and the arc initiation height. After reaching the set piercing time, complete the piercing action.

[0071] Among them, "positioning enable" refers to whether height positioning is activated, and "successful arc ignition" means waiting for the welding machine to return a signal indicating successful arc ignition before cutting. The piercing time is the piercing waiting time after arc ignition; in this application, the piercing time is approximately 0.5-2 seconds.

[0072] The arc initiation height refers to the distance between the cutting torch and the workpiece before the arc is initiated, measured in distance or rise time. In this application, the arc initiation height is 3-8 mm, or the rise time is 0.3-1 s.

[0073] Specifically, if positioning enable and arc initiation are successfully turned on, the cutting torch descends and touches the material to be cut, then rises to the set arc initiation height to perform the arc initiation operation. After receiving the arc initiation success signal from the power supply, the cutting torch continues to rise to the dynamic piercing height, and then descends back to the arc initiation height. The timing starts from the successful arc initiation, and after the set piercing time is reached, the piercing action is completed.

[0074] If positioning enable is turned off and arc ignition success is turned on, arc ignition will start directly. After receiving the arc ignition success signal from the power supply, the cutting torch will continue to rise to the dynamic piercing height, and then descend back to the arc ignition height. Timing will start from the arc ignition success timer. After the set piercing time is reached, the piercing action will be completed.

[0075] If positioning is enabled and arc ignition is disabled, the cutting torch descends and contacts the material to be cut, then rises to the set arc ignition height to perform the arc ignition operation. The cutting torch continues to rise to the dynamic piercing height, then descends back to the arc ignition height. The piercing action is completed after the arc ignition timer reaches the set piercing time.

[0076] If positioning enable and arc initiation success are both turned off, arc initiation will start directly. The cutting torch will continue to rise to the dynamic piercing height, and then descend back to the arc initiation height. The timing will start from the arc initiation and the piercing action will be completed after the set piercing time is reached.

[0077] Dynamic perforation refers to the lifting protection distance after arc initiation, measured in distance or rise time. In this application, the dynamic perforation distance is 1-5mm, or the rise time is 0.2-0.8s.

[0078] S430: After perforation is completed, cutting is performed using a preset cutting current. Preferably, the plasma arc voltage increase function can be turned on or off during the cutting process, depending on the definition of the increase enable.

[0079] Here, cutting current refers to the plasma current used in the cutting process; height adjustment enable refers to whether a height adjuster is used during the cutting process. Generally, when cutting the internal structure of a material, the plasma arc voltage height adjustment function can be enabled or disabled, while it must be disabled when cutting the edge of the material.

[0080] Further preferred, in the case of material edge cutting, a differentiated signal indicating successful arc initiation is required, namely, successful small arc initiation. Specifically, this refers to the situation where the cutting torch emits an arc but does not achieve a stable cutting current with the material. For internal perforation cutting of materials, a complete successful arc initiation signal is required. For material edge cutting, as long as a small arc initiation is achieved, it is considered successful arc initiation. Figure 3 As shown. Meanwhile, the edge portion of the material being cut is completely off from the plasma arc voltage boosting function and is not controlled by the boosting enable.

[0081] S440: After cutting, turn off the arc and lift the torch according to the defined lifting height to avoid collisions when moving the torch.

[0082] The lifting height refers to the distance the cutting torch lifts after the arc is broken, measured in distance or rising time. In this application, the lifting height is 5-20mm and the rising time is 0.5-2s.

[0083] Example 2

[0084] Taking the control of a plasma cutting mechanism to cut H-beams as an example:

[0085] When cutting the flange plates without beveling: use the conventional cutting process. Do not turn on the height adjustment when starting the arc. After cutting 5mm into the material, turn on the arc pressure height adjustment. When cutting to the middle of the flange plate where it connects with the web plate, switch to the corner transition process. After cutting past the connection between the flange plate and the web plate, switch back to the conventional cutting process. Finally, turn off the height adjustment 5mm before the cut is completed.

[0086] When there is a bevel when cutting the two flange plates: use the bevel cutting process, and switch to the bevel corner process when cutting to the middle of the flange plate where it connects with the web plate.

[0087] When cutting the web: At web corners, use a corner transition technique and disable height adjustment. At web planar surfaces, use a thin-surface transition technique and enable height adjustment.

[0088] When cutting small holes in the flange: use the hole-cutting process and turn off the height adjustment.

[0089] When cutting small holes in the web: use the thin-surface cutting process and close the height adjustment.

[0090] When marking lines: use a marking process.

[0091] Example 3

[0092] Taking the control of a plasma cutting mechanism to cut square tubes as an example:

[0093] The four planes of the square tube are not beveled: conventional cutting process is used, and the height is adjusted.

[0094] The square tube has bevels on all four planes: a bevel cutting process is used, and the height is adjusted.

[0095] The four rounded corners of the square tube: use a corner transition process and adjust the height.

[0096] The four rounded corners of the square tube have bevels: a bevel corner process is used, and the height is adjusted.

[0097] When cutting small holes: Use the hole cutting process and turn off the height adjustment.

[0098] When marking lines: use a marking process.

[0099] Example 4

[0100] Taking the control of a plasma cutting mechanism to cut a round tube as an example:

[0101] The surface of the round tube is not beveled: conventional cutting process is used, and the height is adjusted.

[0102] The surface of the round tube has a dynamic bevel of 0-15 degrees: using a thin-surface cutting process, with height adjustment turned off.

[0103] The surface of the round tube has a dynamic bevel of 15-30 degrees: a corner transition process is used, and the height adjustment is closed.

[0104] The surface of the round tube has a dynamic bevel of 30-45 degrees: using beveling cutting technology, the height adjustment is turned off.

[0105] When cutting small holes: Use the hole cutting process and turn off the height adjustment.

[0106] When marking lines: use a marking process.

[0107] Example 5

[0108] Taking the control of a plasma cutting mechanism to cut channel steel as an example:

[0109] For channel steel without beveling: use conventional cutting process, turn off the height adjustment within the first 5mm of the cutting, turn it on after 5mm, and turn it off again within the last 5mm.

[0110] The channel steel has a bevel: a bevel cutting process is used, and the height is adjusted.

[0111] When cutting small holes in the flange: use the hole-cutting process and turn off the height adjustment.

[0112] When cutting small holes in the web: use the thin-surface cutting process and close the height adjustment.

[0113] When marking lines: use a marking process.

[0114] Example 6

[0115] Taking the control of a plasma cutting mechanism to cut angle steel as an example:

[0116] Angle steel without beveling: Use conventional cutting process, turn off the height adjustment within the first 5mm of the cutting, turn on the height adjustment after 5mm, and turn off the height adjustment within the last 5mm of the cutting.

[0117] The angle steel has a bevel: use bevel cutting technology, whether to enable height adjustment is set according to the preset cutting technology.

[0118] When cutting small holes: Use the hole cutting process and turn off the height adjustment.

[0119] When marking lines: use a marking process.

[0120] Implementation of 7

[0121] The difference between this embodiment and Embodiment 1 is that the cutting mechanism in this embodiment is a laser cutting mechanism. The content disclosed in Embodiment 1 is incorporated into this embodiment without contradiction. Those skilled in the art should understand that by adjusting the cutting parameters affecting the cutting performance of the laser cutting mechanism, this embodiment can also achieve the purpose of online cutting of steel profiles.

[0122] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by essentially the same means shall fall within the protection scope of the present invention.

Claims

1. A method for controlling the cutting of structural steel, characterized in that, The system identifies the cross-sectional characteristics of the steel section to be cut, determines the corresponding cutting process in the process library, and controls the cutting mechanism to execute the cutting operation according to the selected cutting process. If it is determined that no corresponding cutting process is stored in the process library, the system controls the cutting mechanism to execute the cutting according to the sub-cutting process selected in real time. The system records and saves the process parameters corresponding to the cutting process of the steel section to be cut, and updates the process library. The controlled cutting mechanism performs cutting according to a real-time selected sub-cutting process, including: identifying the cutting condition based on the cross-sectional characteristics of the steel to be cut; determining the sub-cutting process corresponding to the condition in the process library; controlling the cutting mechanism to perform the cutting operation according to the selected sub-cutting process; if it is determined that no sub-cutting process corresponding to the condition is stored in the process library, the controlled cutting mechanism performs the cutting operation according to the real-time adjusted process parameters; recording and saving the process parameters corresponding to the sub-cutting process of the condition; and updating the process library. Section features of steel profiles are used to describe the cross-sectional shape of steel profiles, determine the type of steel profile, and control the selection and determination of process parameters in the corresponding sub-cutting processes. The cutting mechanism is a plasma cutting mechanism. When controlling the plasma cutting mechanism to perform cutting according to the process parameters adjusted in real time, it includes selecting a suitable cutting gas and cutting gas pressure, and selecting a suitable protective gas and protective gas pressure. Determine whether positioning enable and arc ignition success are turned on. Based on the set status, determine the positioning of the cutting torch and the arc ignition height. After reaching the set piercing time, complete the piercing action. After piercing, use the preset cutting current to perform cutting. According to the definition of height adjustment enable, turn the plasma arc voltage height adjustment function on or off during the cutting process. After cutting is completed, turn off the arc and lift the torch according to the defined lifting height to avoid collisions when moving the torch.

2. The steel section cutting control method according to claim 1, characterized in that, The determination of the sub-cutting process corresponding to the working condition in the process library, and the control of the cutting mechanism to perform the cutting operation according to the selected sub-cutting process, includes at least one of the following execution methods: The cutting condition to be performed is a simple planar cutting, and the cutting mechanism is controlled to perform the cutting operation according to the conventional cutting process; The cutting condition to be performed is the cutting of a surface with a thinning thickness. The cutting mechanism is controlled to perform the cutting operation according to the thin surface transition process. The cutting conditions to be performed are rounded corner surfaces, corner surfaces, and flat surfaces with varying thicknesses. The cutting mechanism is controlled to perform the cutting operation according to the corner transition process. The cutting condition to be performed is the cutting of the surface that needs to be beveled. The cutting mechanism is controlled to perform the cutting operation according to the bevel cutting process. The cutting conditions to be performed are the cutting of rounded corners, corners, and planes with varying thicknesses in the bevel of the steel profile. The cutting mechanism is controlled to perform the cutting operation according to the bevel corner process. The cutting condition to be performed is the cutting of holes on the conventional surface of the steel profile. The cutting mechanism is controlled to perform the cutting operation according to the hole cutting process. The cutting condition to be performed is the cutting of holes on the thin surface of the steel profile. The cutting mechanism is controlled to perform the cutting operation according to the thin surface hole cutting process. The cutting condition to be performed is marking, and the cutting mechanism is controlled to perform the cutting operation according to the marking process.

3. The steel section cutting control method according to claim 1, characterized in that, The identification of the cross-sectional features of the steel to be cut includes obtaining the cross-sectional features of the steel to be cut through manual input or online identification.

4. The steel section cutting control method according to claim 3, characterized in that, The online identification unit includes a sensor and a signal identification unit. The sensor is installed on the steel section to be cut and is transported along with the steel section on the guide rail. The signal identification unit is communicatively linked with the controller. The signal identification unit reads the signal from the sensor, obtains the cross-sectional characteristics of the steel section, and transmits the obtained cross-sectional characteristics to the controller.

5. The steel section cutting control method according to claim 3, characterized in that, The online identification unit measures the dimensions of the profile after online monitoring and measurement to obtain the kerf size. The PID algorithm is then used to perform real-time dynamic compensation for the kerf size of the steel profile.

6. The steel section cutting control method according to claim 1, characterized in that, Obtain the process parameters of the sub-cutting process corresponding to the working condition, including system-recommended parameters or system-automatically given parameters.

7. The steel section cutting control method according to claim 1, characterized in that, When cutting through holes inside a material, the arc initiation success signal must be a complete arc initiation success. When cutting the edge of a material, as long as a small arc success is achieved, it can be considered an arc initiation success. At the same time, the edge part of the material being cut is completely off from the plasma arc voltage adjustment function and is not controlled by the adjustment enable.

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