Numerical control flame cutting machine and double-plate asynchronous preheating and collaborative cutting method thereof

Abstract

The application discloses a double-plate asynchronous preheating and collaborative cutting method of a numerical control flame cutting machine, and comprises the following steps: calling a preset database to obtain preheating time and cutting speed corresponding to the thickness of two steel plates respectively; generating an initial cutting position in real time based on the cutting-in points of four cutting guns in the numerical control flame cutting machine and the inclination angle of the steel plates; adjusting the positions of the four cutting guns to the initial cutting position and starting the four cutting guns to perform asynchronous preheating and collaborative cutting; wherein, when each cutting gun reaches the corresponding cutting-in point to perform preheating, a previous gun is synchronously controlled to perform lateral avoidance, and the previous gun refers to all cutting guns that reach the corresponding cutting-in point earlier than the current cutting gun. Based on the method, the steel plate burning defects and the laying steel precision dependence problems caused by stopping cutting oxygen in the traditional cutting method are overcome.

Description

Technical Field

[0001] This invention relates to the field of metal sheet processing technology, specifically to a CNC flame cutting machine and its dual-plate asynchronous preheating and collaborative cutting method. Background Technology

[0002] Existing double-plate cutting technology has three major drawbacks:

[0003] 1. High dependence on end alignment: Traditional alignment cutting requires manual adjustment of the steel plate position to ensure end alignment, and then uniform cutting according to the speed of thick plates and the length of long plates. However, it is difficult to guarantee the alignment accuracy of steel laying on site. Stopping preheating during the cutting process will lead to cutting defects.

[0004] 2. Severe defects in misaligned cutting: When the cutting oxygen is turned off, the high-temperature flame (about 1100℃) continues to burn the steel plate, and after restarting, a molten pit with a diameter of 3-8mm is formed at the burning point; 3. Significant efficiency loss: The large number of manual intervention steps (such as oxygen shut-off and manual movement of the nozzle) increases the time required for a single cut by 35%. Summary of the Invention

[0005] To overcome the defects of steel plate scorching caused by the shutdown of cutting oxygen and the dependence on steel laying accuracy in traditional cutting methods, this invention provides a CNC flame cutting machine and its dual-plate asynchronous preheating and collaborative cutting method. During cutting, it adopts a split-gun preheating and low-speed transverse cutting technology to avoid the continuous scorching of the edge by the flame after the cutting oxygen is shut off, which would cause a molten pit.

[0006] According to one aspect of the present invention, a method for asynchronous preheating and collaborative cutting of two steel plates using a CNC flame cutting machine is provided, comprising: calling a preset database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates respectively; generating an initial cutting position in real time based on the entry points of the four cutting guns in the CNC flame cutting machine and the inclination angle of the steel plates; adjusting the positions of the four cutting guns to the initial cutting position and starting the four cutting guns to perform asynchronous preheating and collaborative cutting; wherein, when each cutting gun reaches the corresponding entry point for preheating, the preceding gun is synchronously controlled to perform lateral avoidance, wherein the preceding guns refer to all cutting guns that arrive at the corresponding entry point earlier than the current cutting gun.

[0007] Furthermore, a preset database is invoked to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates, including: invoking the thickness-speed table to obtain the first cutting speed and the second cutting speed corresponding to the first steel plate and the second steel plate, respectively; and invoking the thickness-preheating table to obtain the first preheating time and the second preheating time corresponding to the first steel plate and the second steel plate, respectively.

[0008] Furthermore, the CNC flame cutting machine includes a first cutting gun and a second cutting gun for cutting the first steel plate, and a third cutting gun and a fourth cutting gun for cutting the second steel plate. The entry points of the four cutting guns correspond to the first entry point, the second entry point, the third entry point, and the fourth entry point, respectively. The distance between the initial cutting position of the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun and the entry point increases sequentially, so that when the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun are started synchronously for asynchronous preheating and collaborative cutting of the two plates, the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun reach the corresponding entry point in sequence.

[0009] Furthermore, four cutting guns are activated for asynchronous preheating and coordinated cutting, including: In the first stage, the fourth cutting gun is controlled to reach the fourth entry point and begin preheating, and after a second preheating time, longitudinal cutting is performed; In the second stage, the third cutting gun is controlled to reach the third entry point and begin preheating, while the fourth cutting gun is controlled to move laterally, and after a second preheating time, the two guns perform longitudinal cutting simultaneously; In the third stage, the second cutting gun is controlled to reach the second entry point and begin preheating, while the third and fourth cutting guns are controlled to move laterally simultaneously, and after a first preheating time, the three guns perform longitudinal cutting simultaneously; In the fourth stage, the first cutting gun is controlled to reach the first entry point and begin preheating, while the second, third, and fourth cutting guns are controlled to move laterally simultaneously, and after a first preheating time, the four guns perform longitudinal cutting to the endpoint.

[0010] Furthermore, when each cutting torch reaches the corresponding entry point for preheating, the preceding torch is simultaneously controlled to move laterally to avoid it, including: in the first and second stages, the preceding torch is simultaneously controlled to move laterally to the outside of the steel plate for half of the second preheating time, and then to move laterally to the inside of the steel plate for half of the second preheating time; in the third and fourth stages, the preceding torch is simultaneously controlled to move laterally to the outside of the steel plate for half of the first preheating time, and then to move laterally to the inside of the steel plate for half of the first preheating time.

[0011] Furthermore, all four cutting guns perform longitudinal cutting at a smaller cutting speed than the first cutting speed and the second cutting speed.

[0012] Furthermore, the cutting method further includes: taking the initial cutting position corresponding to the fourth cutting gun as a reference, and calculating the coordinates of the initial cutting positions corresponding to the first cutting gun, the second cutting gun, and the third cutting gun according to the coordinates of the first cutting point, the second cutting point, and the third cutting point.

[0013] Furthermore, the cutting method also includes: the initial cutting position corresponding to the fourth cutting gun coincides with the fourth entry point.

[0014] Furthermore, when the steel plate thickness is less than or equal to 20 mm, it corresponds to the first level of preheating time and the first level of cutting speed; when the steel plate thickness is greater than 20 mm and less than or equal to 30 mm, it corresponds to the second level of preheating time and the second level of cutting speed; when the steel plate thickness is greater than 30 mm and less than or equal to 40 mm, it corresponds to the third level of preheating time and the third level of cutting speed; when the steel plate thickness is greater than 40 mm and less than or equal to 60 mm, it corresponds to the fourth level of preheating time and the fourth level of cutting speed; when the steel plate thickness is greater than 60 mm and less than or equal to 80 mm, it corresponds to the fifth level of preheating time and the fifth level of cutting speed; and when the steel plate thickness is greater than 80 mm, it corresponds to the sixth level of preheating time and the sixth level of cutting speed.

[0015] According to one aspect of the present invention, a CNC flame cutting machine is provided, comprising: four cutting torches for cutting two steel plates; a controller for calling a preset database to obtain preheating time and cutting speed corresponding to the thickness of the two steel plates respectively; generating an initial cutting position in real time based on the entry point of the four cutting torches and the inclination angle of the steel plates; automatically adjusting the positions of the four cutting torches to the initial cutting position and starting the four cutting torches for asynchronous preheating and coordinated cutting; wherein, when each cutting torch reaches the corresponding entry point for preheating, the preceding torch is synchronously controlled to laterally avoid it, wherein the preceding torches refer to all cutting torches that arrive at the corresponding entry point earlier than the current cutting torch.

[0016] The above technical solution utilizes a pre-set database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates, thereby adjusting the preheating time and cutting speed according to the steel plate thickness. Based on the entry points of the four cutting torches in the CNC flame cutting machine and the inclination angle of the steel plate, the initial cutting position is generated in real time, allowing the four cutting torches to cut along the corresponding initial cutting position and the line where the entry point is located. This achieves adaptive adjustment of the cutting direction of the cutting torches without moving the steel plate, enabling the cutting torches to accurately complete the cutting operation along the length of the steel plate. The positions of the four cutting torches are adjusted to the initial cutting positions, and the four cutting torches are started for asynchronous preheating and coordinated cutting. During cutting, there is no need to shut down the cutting oxygen; instead, a technique of separate torch preheating and low-speed lateral cutting is used. When each cutting torch reaches its corresponding entry point for preheating, the preceding torch is synchronously controlled to laterally avoid it, and cutting is synchronized only after preheating is complete.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) Eliminate the steel plate burning defect caused by the shutdown of cutting oxygen in traditional non-aligned cutting.

[0019] (2) Reduce the dependence of double plate cutting on steel laying accuracy and improve the process error tolerance.

[0020] (3) Achieve full-process automated control and reduce manual intervention. Attached Figure Description

[0021] Figure 1 A flowchart illustrating the workflow of a dual-plate cutting system provided in an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the steel plate cutting point positioning provided in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the four-gun cutting sequence and avoidance action provided in an embodiment of the present invention.

[0024] Figure 4 This is a cross-section of the melting pit in a traditional oxygen-free process.

[0025] Figure 5 This is a cross-sectional view provided for an embodiment of the present invention. Detailed Implementation

[0026] The technical solutions of various 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 understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Please refer to the appendix. Figure 1 This embodiment provides a dual-plate asynchronous preheating and collaborative cutting method for CNC flame cutting machines, including the following steps:

[0031] Step S1: Call the preset database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates respectively.

[0032] In step S1, two steel plates to be cut (i.e., plate 1 and plate 2) are first laid in the cutting area, and the thickness (δ1, δ2), width (W1, W2), and length (L1, L2) of plate 1 / plate 2 are input into the CNC flame cutting machine. The CNC flame cutting machine uses a dual-database driver to achieve parameter self-adaptation. Specifically, the thickness-speed table is called to obtain the first and second cutting speeds corresponding to the first and second steel plates, respectively; the thickness-preheating table is called to obtain the first and second preheating times corresponding to the first and second steel plates, respectively. Specifically, when the steel plate thickness is less than or equal to 20 mm, the first preheating time and first cutting speed apply; when the steel plate thickness is greater than 20 mm but less than or equal to 30 mm, the second preheating time and second cutting speed apply; when the steel plate thickness is greater than 30 mm but less than or equal to 40 mm, the third preheating time and third cutting speed apply; when the steel plate thickness is greater than 40 mm but less than or equal to 60 mm, the fourth preheating time and fourth cutting speed apply; when the steel plate thickness is greater than 60 mm but less than or equal to 80 mm, the fifth preheating time and fifth cutting speed apply; and when the steel plate thickness is greater than 80 mm, the sixth preheating time and sixth cutting speed apply. It is understood that the steel plate thickness, width, length, preheating time, and cutting speed can all be set according to actual needs and are not limited here.

[0033] In this embodiment, please refer to Table 1 for the preset database.

[0034] Table 1 Correspondence between Steel Plate Thickness, Cutting Speed, and Preheating Time

[0035] δ≤20 0.52 10 20<δ≤30 0.48 15 30<δ≤40 0.42 15 40<δ≤60 0.3 20 60<δ≤80 0.24 30 80≤δ 0.2 50

[0036] In this embodiment, the data of the steel plates to be cut is input. Taking Q355B steel plate as an example, plate 1: δ1=30mm, L1=12000mm, W1=2400mm. Plate 2: δ2=35mm, W2=2500mm, L2=10000mm. Database is accessed: δ1=30mm → V1=0.48m / min, t1=15s. δ2=35mm → V2=0.42m / min, t2=15s.

[0037] Step S2: Based on the entry points of the four cutting guns in the CNC flame cutting machine and the tilt angle of the steel plate, the initial cutting position is generated in real time.

[0038] In step S2, the cutting torch is used to cut the steel plate. The entry point is located at the edge of the steel plate. The entry point refers to the actual starting point of the cutting torch entering the steel plate, while the initial cutting position refers to the theoretical starting point of the cutting torch entering the steel plate. The steel plate tilt angle refers to the angle between the length direction of the steel plate and the length direction of the CNC flame cutting machine. It should be noted that the cutting direction of the CNC flame cutting machine must be perpendicular to the cutting surface; otherwise, it will result in a skewed cut and slag accumulation. Existing CNC flame cutting machines cut along the length direction of the CNC flame cutting machine. This requires ensuring that the length direction of the steel plate is consistent with the length direction of the CNC flame cutting machine. However, the placement of the steel plate may be off. To solve this directional coordination problem, traditional cutting methods do not change the cutting direction of the CNC flame cutting machine but instead use manual adjustment of the steel plate position. By manually moving and calibrating, the length direction of the steel plate is made consistent with the length direction of the CNC flame cutting machine, thus meeting the matching of the cutting direction and the steel plate processing requirements. However, manual adjustment relies on the operator's experience, and the accuracy is difficult to guarantee. This invention overcomes the limitations of traditional manual adjustments. Its technical solution involves first accurately acquiring the steel plate's tilt angle data through appropriate detection methods, and then using this tilt angle as the core basis to adaptively adjust the cutting direction of the cutting gun. Ultimately, this allows the cutting gun to precisely complete the cutting operation along the length of the steel plate without moving the plate, effectively improving cutting efficiency and ease of operation.

[0039] The CNC flame cutting machine includes a first and second cutting gun for cutting a first steel plate, and a third and fourth cutting gun for cutting a second steel plate. The entry points of the four cutting guns correspond to the first, second, third, and fourth entry points, respectively. The initial cutting positions of the fourth, third, second, and first cutting guns are progressively larger than their entry points, so that when the fourth, third, second, and first cutting guns are simultaneously activated for asynchronous preheating and collaborative cutting of two plates, the fourth, third, second, and first cutting guns sequentially reach their corresponding entry points. It should be noted that the distance between the initial cutting position and the entry point of each cutting gun in this application depends on the actual placement of the steel plates. The progressively increasing distance between the initial cutting position and the entry point of the fourth, third, second, and first cutting guns is merely an example. Furthermore, in some feasible embodiments, the number of cutting guns can be increased or decreased to achieve cutting of more or fewer steel plates. For example, six cutting guns can be used to achieve asynchronous preheating and collaborative cutting of three steel plates.

[0040] (1) Two cutting points are manually positioned on the edge of each steel plate according to the cutting width. The cutting width (e.g., 2400mm, not specified here) refers to the width of the portion to be removed from the entire steel plate during this cutting operation. Using the two edges of the steel plate as a reference, the distance corresponding to the "cutting width" is measured from the two edges towards the inside of the steel plate. Two points are marked on the edge of the steel plate at the endpoint of this distance. These two points are the starting positions (i.e., cutting points) where the cutting gun enters the steel plate. A total of four cutting points are positioned on the two steel plates (e.g., ...). Figure 2 As shown), the coordinates of the four gun entry points are:

[0041] Point A (first cutting gun, i.e. gun 1, left of plate 1): (Xa, Ya).

[0042] Point B (second cutting gun, i.e., gun 2, right of plate 1): (Xb, Yb).

[0043] Point C (third cutting gun, i.e., gun number 3, left of plate 2): (Xc, Yc).

[0044] Point D (fourth cutting gun, i.e., gun number 4, right of plate 2): (Xd, Yd).

[0045] (2) Measuring the tilt angle of the steel plate: Select any two points along the length of the steel plate, and the two points determine a straight line. The angle between this straight line and the length of the CNC flame cutting machine is the tilt angle of the steel plate. This application uses laser edge finding to determine the tilt angles α (plate 1) and β (plate 2).

[0046] (3) Coordinate dynamic calculation mechanism: Based on the four gun entry points (A, B, C, D) and the steel plate tilt angle, the initial cutting position (A1, B1, C1, D1) is automatically calculated with point D as the reference, ensuring the logical connection of the starting point of each gun.

[0047] A1 = [Xa+(Yd-Ya)tanα,Yd].

[0048] B1 = [Xb+(Yd-Yb)tanα,Yd].

[0049] C1 = [Xc+(Yd-Yc)tanβ,Yd].

[0050] Understandably, in an ideal situation (i.e., the ends of the steel plates are aligned, that is, the length direction of the steel plates is aligned with the length direction of the CNC flame cutting machine), the initial cutting position and the entry point coincide. However, due to the deviation in the placement of the steel plates, the initial cutting position and the entry point do not coincide. In this application, the initial cutting position corresponding to the fourth cutting gun is set to coincide with the fourth entry point. This allows the cutting gun to reach the cutting starting point more quickly, shortens the preparation time, and improves the cutting efficiency.

[0051] Step S3: Adjust the positions of the four cutting guns to the initial cutting positions and start the four cutting guns for asynchronous preheating and collaborative cutting; wherein, when each cutting gun reaches the corresponding entry point for preheating, the preceding gun is synchronously controlled to laterally avoid it. The preceding gun refers to all cutting guns that arrive at the corresponding entry point earlier than the current cutting gun.

[0052] In step S3, in the first stage, the fourth cutting gun is controlled to reach the fourth entry point and begin preheating. After a second preheating time, longitudinal cutting is performed. In the second stage, the third cutting gun is controlled to reach the third entry point and begin preheating. At the same time, the fourth cutting gun is controlled to move laterally. After a second preheating time, the two guns perform longitudinal cutting simultaneously. In the third stage, the second cutting gun is controlled to reach the second entry point and begin preheating. At the same time, the third and fourth cutting guns are controlled to move laterally. After a first preheating time, the three guns perform longitudinal cutting simultaneously. In the fourth stage, the first cutting gun is controlled to reach the first entry point and begin preheating. At the same time, the second, third, and fourth cutting guns are controlled to move laterally. After a first preheating time, the four guns perform longitudinal cutting to the endpoint.

[0053] Furthermore, as each cutting torch reaches its corresponding entry point for preheating, the preceding torch is simultaneously controlled to laterally avoid it. This includes: in the first and second stages, the preceding torch is simultaneously controlled to move laterally outward for half of the second preheating time, and then laterally inward for half of the second preheating time; in the third and fourth stages, the preceding torch is simultaneously controlled to move laterally outward for half of the first preheating time, and then laterally inward for half of the first preheating time. Understandably, the lateral cutting speed of the cutting torch is equal to the cutting width / (preset time / 2). Furthermore, all four cutting guns perform longitudinal cutting at a smaller cutting speed, v(max(δ1, δ2), between the first and second cutting speeds. Understandably, the longitudinal cutting speed is actually equal to the cutting speed corresponding to the thicker steel plate of the two plates; the greater the thickness of the steel plate, the smaller the corresponding cutting speed. In this embodiment, since δ1 = 30mm < δ2 = 35mm, v(max(δ1, δ2) = v(δ2) = V2 = 0.42 m / min.

[0054] In this embodiment, in the first stage (i.e. Figure 3 Phase I): Gun #4 starts from point D, calls the database at δ2=35mm → preheats for 15s → cuts at 0.42m / min (at δ2 speed); in the second phase (i.e. Figure 3 Phase II): When gun #3 reaches point C, gun #4 moves laterally outward from the steel plate at 0.1 m / min for 7.5 s, then moves laterally inward from the steel plate for 7.5 s → gun #3 completes preheating → both guns cut simultaneously; in the third phase (i.e. Figure 3 Phase III): When gun #2 reaches point B, guns #3 and #4 simultaneously move laterally for 15 seconds → gun #2 completes warm-up → all three guns move simultaneously; in Phase IV (i.e. Figure 3 Phase IV): When gun 1 reaches point A, guns 2, 3, and 4 simultaneously avoid each other for 15 seconds → gun 1 completes preheating → all four guns cut to the endpoint at 0.42 m / min (at a speed of δ2), completing the cutting procedure. Based on this, the following is achieved: 1. Zero burning defects: Lateral cutting out and cutting in causes the flame to leave the cutting path, avoiding the continuous burning of the edge by the oxygen flame after the cutting is stopped, thus preventing molten pits (please refer to [reference]). Figure 4 and Figure 5 ); ); 2. Improved fault tolerance: Reduces the dependence of double plate cutting on steel laying accuracy, eliminates the need for end alignment, improves process fault tolerance, and shortens steel laying time by 50%; 3. Fully automated: After edge finding and point positioning are completed, no manual intervention is required from the start of cutting to the completion of cutting, improving efficiency by 35%.

[0055] Based on the same technical concept as the aforementioned embodiments, the present invention also provides a CNC flame cutting machine, which includes four cutting guns and a controller: the four cutting guns are used to cut two steel plates; the controller is used to call a preset database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates respectively; based on the entry point of the four cutting guns and the tilt angle of the steel plates, the initial cutting position is generated in real time; the positions of the four cutting guns are automatically adjusted to the initial cutting position, and the four cutting guns are started to perform asynchronous preheating and collaborative cutting; wherein, when each cutting gun reaches the corresponding entry point for preheating, the preceding gun is synchronously controlled to perform lateral avoidance, and the preceding gun refers to all cutting guns that arrive at the corresponding entry point earlier than the current cutting gun.

[0056] In summary, this invention provides a CNC flame cutting method for simultaneous double-sided cutting of two steel plates in a non-precisely aligned state. It solves the problems of steel plate melting defects caused by oxygen shutdown and the dependence on steel laying accuracy in traditional double-plate cutting by using dynamic path planning and a collaborative motion strategy for the cutting torch. Specifically, a preset database is accessed to obtain the preheating time and cutting speed corresponding to the thickness of each of the two steel plates, thereby adjusting the preheating time and cutting speed according to the steel plate thickness. Based on the entry points of the four cutting torches in the CNC flame cutting machine and the inclination angle of the steel plate, initial cutting positions are generated in real time, allowing the four cutting torches to cut along the corresponding initial cutting positions and the lines containing the entry points. This enables adaptive adjustment of the cutting direction of the cutting torches without moving the steel plates, allowing the cutting torches to accurately complete the cutting operation along the length of the steel plate. Adjust the positions of the four cutting torches to the initial cutting positions and start the four cutting torches for asynchronous preheating and coordinated cutting. During cutting, there is no need to shut off the cutting oxygen. Instead, a technique of separate torch preheating and low-speed lateral cutting is adopted. When each cutting torch reaches the corresponding cutting point for preheating, the preceding torch is synchronously controlled to laterally avoid it. Cutting is then performed synchronously after preheating is completed. This avoids the problem of continuous burning of the edge by the flame after shutting off the cutting oxygen, which can cause a molten pit.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the technical solutions of the embodiments of the present invention.

Claims

1. A method for asynchronous preheating and coordinated cutting of two plates using a CNC flame cutting machine, characterized in that, include: Call the preset database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates respectively; The initial cutting position is generated in real time based on the entry points of the four cutting guns in the CNC flame cutting machine and the tilt angle of the steel plate; the CNC flame cutting machine includes a first cutting gun and a second cutting gun for cutting the first steel plate, and a third cutting gun and a fourth cutting gun for cutting the second steel plate. The entry points of the four cutting guns correspond to the first entry point, the second entry point, the third entry point, and the fourth entry point, respectively. The distance between the initial cutting position of the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun and the entry point increases sequentially, so that when the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun are started synchronously for asynchronous preheating and collaborative cutting of the dual plates, the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun arrive at the corresponding entry point in sequence. Adjust the positions of the four cutting guns to the initial cutting positions, and start the four cutting guns for asynchronous preheating and coordinated cutting, including: In the first stage, control the fourth cutting gun to reach the fourth entry point and start preheating, and perform longitudinal cutting after a second preheating time; In the second stage, control the third cutting gun to reach the third entry point and start preheating, while controlling the fourth cutting gun to move laterally, and perform longitudinal cutting synchronously after a second preheating time; In the third stage, control the second cutting gun to reach the second entry point and start preheating, while controlling the third and fourth cutting guns to move laterally synchronously, and perform longitudinal cutting synchronously after a first preheating time; In the fourth stage, control the first cutting gun to reach the first entry point and start preheating, while controlling the second, third, and fourth cutting guns to move laterally synchronously, and perform longitudinal cutting to the endpoint after a first preheating time. Specifically, when each cutting gun reaches its corresponding entry point for preheating, the preceding gun is simultaneously controlled to move laterally to avoid it. This includes: in the first and second stages, the preceding gun is simultaneously controlled to move laterally outward for half of the second preheating time, and then laterally inward for half of the second preheating time; in the third and fourth stages, the preceding gun is simultaneously controlled to move laterally outward for half of the first preheating time, and then laterally inward for half of the first preheating time; the preceding gun refers to all cutting guns that arrive at the corresponding entry point earlier than the current cutting gun.

2. The method for dual-plate asynchronous preheating and coordinated cutting of a CNC flame cutting machine according to claim 1, characterized in that, The system calls a preset database to retrieve the preheating time and cutting speed corresponding to the thicknesses of the two steel plates, including: Call the thickness-speed table to obtain the first cutting speed and the second cutting speed corresponding to the first steel plate and the second steel plate, respectively; Call the thickness-preheating time table to obtain the first preheating time and the second preheating time for the first steel plate and the second steel plate, respectively.

3. The method for dual-plate asynchronous preheating and coordinated cutting of a CNC flame cutting machine according to claim 2, characterized in that, All four cutting guns perform longitudinal cutting at a smaller cutting speed than the first cutting speed and the second cutting speed.

4. The method for dual-plate asynchronous preheating and coordinated cutting of a CNC flame cutting machine according to claim 1, characterized in that, The cutting method further includes: taking the initial cutting position corresponding to the fourth cutting gun as a reference, and calculating the coordinates of the initial cutting positions corresponding to the first cutting gun, the second cutting gun, and the third cutting gun according to the coordinates of the first cutting point, the second cutting point, and the third cutting point.

5. The method for dual-plate asynchronous preheating and coordinated cutting of a CNC flame cutting machine according to claim 1, characterized in that, The cutting method further includes: the initial cutting position corresponding to the fourth cutting gun coincides with the fourth entry point.

6. The method for dual-plate asynchronous preheating and coordinated cutting of a CNC flame cutting machine according to claim 1, characterized in that, When the steel plate thickness is less than or equal to 20 mm, the corresponding preheating time and cutting speed are as follows: When the steel plate thickness is greater than 20 mm and less than or equal to 30 mm, the corresponding preheating time and cutting speed are set to the second level. When the steel plate thickness is greater than 30 mm and less than or equal to 40 mm, the corresponding preheating time and cutting speed are the third level. When the steel plate thickness is greater than 40 mm and less than or equal to 60 mm, the corresponding preheating time and cutting speed are set to the fourth level. When the steel plate thickness is greater than 60 mm and less than or equal to 80 mm, the corresponding preheating time and cutting speed are fifth level. When the steel plate thickness is greater than 80 mm, the corresponding preheating time and cutting speed are set to the sixth level.

7. A CNC flame cutting machine, characterized in that, include: Four cutting guns are used to cut two steel plates; The controller is used to call a preset database to obtain the preheating time and cutting speed corresponding to the thickness of the two steel plates respectively; The initial cutting position is generated in real time based on the entry points of the four cutting guns in the CNC flame cutting machine and the tilt angle of the steel plate; the CNC flame cutting machine includes a first cutting gun and a second cutting gun for cutting the first steel plate, and a third cutting gun and a fourth cutting gun for cutting the second steel plate. The entry points of the four cutting guns correspond to the first entry point, the second entry point, the third entry point, and the fourth entry point, respectively. The distance between the initial cutting position of the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun and the entry point increases sequentially, so that when the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun are started synchronously for asynchronous preheating and collaborative cutting of the dual plates, the fourth cutting gun, the third cutting gun, the second cutting gun, and the first cutting gun arrive at the corresponding entry point in sequence. The system automatically adjusts the positions of the four cutting guns to their initial cutting positions and initiates asynchronous preheating and coordinated cutting. This includes: In the first stage, the fourth cutting gun begins preheating after reaching the fourth entry point, and after a second preheating time, it performs longitudinal cutting; in the second stage, the third cutting gun begins preheating after reaching the third entry point, while the fourth cutting gun moves laterally to avoid it, and after a second preheating time, both guns perform longitudinal cutting synchronously; in the third stage, the second cutting gun begins preheating after reaching the second entry point, while the third and fourth cutting guns move laterally to avoid it synchronously, and after a first preheating time, all three guns perform longitudinal cutting synchronously; in the fourth stage, the first cutting gun begins preheating after reaching the first entry point. Preheating is performed while simultaneously controlling the second, third, and fourth cutting guns to move laterally to avoid each other. After a first preheating time, the four guns cut longitudinally to the endpoint. Specifically, when each cutting gun reaches its corresponding entry point for preheating, the preceding gun is simultaneously controlled to move laterally to avoid each other. This includes: in the first and second stages, the preceding gun is simultaneously controlled to move laterally outward for half of the second preheating time, and then laterally inward for half of the second preheating time; in the third and fourth stages, the preceding gun is simultaneously controlled to move laterally outward for half of the first preheating time, and then laterally inward for half of the first preheating time. The preceding guns refer to all cutting guns that arrive at their corresponding entry points earlier than the current cutting gun.

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