A cutting method with intermittent points during cutting

Abstract

The present invention provides a cutting method for intermittently leaving points during flame cutting, which is applied to the cutting process of a CNC straight-strip flame cutting machine, and is characterized in that the method comprises: placing one end of the blocking device next to the cutting flame for preheating before cutting by the CNC straight-strip flame cutting machine; placing the blocking device under the cutting nozzle for blocking cutting during the cutting process of the CNC straight-strip flame cutting machine, and after a good distance is reserved, placing one end of the blocking device in red against the plate, quickly moving it to the bottom of the cutting nozzle, and immediately retracting it; allowing the heated blocking device to touch the impact of fast oxygen and quickly penetrate the plate. This allows the machine tool to intermittently leave points on the plate without stopping, without having to stop the machine tool for preheating, thereby increasing the cutting speed of the plate and improving the production efficiency in the later stage.

Description

Technical Field

[0001] The invention relates to the technical field of steel material processing operations, in particular to a method for discontinuously leaving points during a flame cutting process. Background Art

[0002] CNC multi-head straight strip flame cutting machine is a highly efficient gas flame cutting equipment that uses oxygen and acetylene as cutting fuel. The flame cutting torch can cut steel plates into strips according to cutting requirements. It can also cut special workpieces or irregular picture parts according to needs. At the same time, multiple flame cutting guns can be installed to meet multiple straight strip cutting needs. It is mainly used in steel market blanking, shipyards, wind farms, steel structure factories, etc.

[0003] At present, in the prior art, when using a CNC multi-head straight strip flame cutting machine to cut strips, when encountering a reserved breakpoint, all the fast oxygens need to be turned off and the CNC cutting machine tool needs to be stopped. Then, the plate is preheated again at the next cutting point, and after the preheating is completed, the fast oxygen is turned on to break through the plate, and the CNC multi-head straight strip flame cutting machine tool is started to move forward, so as to cut until the next reserved point, and then the machine tool is stopped and the fast oxygen is turned off, and then the next starting point is preheated and cut again.

[0004] During the whole process of cutting plates with CNC multi-head straight flame cutting machines, the machine tool is always stopped when a point is left, resulting in too many preheating points, which directly affects the processing cycle, and the preheating point perforation position is poorly formed. When multiple cutting nozzles perforate in the same straight line at the same time, the fast oxygen flow will also affect the adjacent cutting nozzles, resulting in some cutting nozzles not being able to be fully perforated or tempering. In view of this, it is urgently necessary to invent a cutting method with intermittent point leaving during the cutting process to increase the cutting speed and shorten the processing cycle. Summary of the invention

[0005] The technical problem to be solved by the present invention is: in the prior art, when a break needs to be reserved during strip cutting of a plate, the machine tool is always stopped when a break point is encountered, resulting in too many break points, which directly affects the processing cycle, and the punching position of the break point is poorly formed. When multiple cutting nozzles are punching in the same straight line at the same time, the fast oxygen flow will also affect the adjacent cutting nozzles, resulting in some cutting nozzles being unable to completely punch or having tempering problems.

[0006] In order to solve the above technical problems, the present invention provides a cutting method with intermittent points in a flame cutting process, comprising:

[0007] Step S1, according to the thickness of the plate, select the cutting nozzle model, cutting speed, oxygen and propane pressure, and determine the interval distance to be reserved;

[0008] Step S2, before cutting the plate, one end of the blocking device is placed next to the cutting flame for preheating;

[0009] Step S3, when the plate reaches the interruption reserved point during the cutting process, the preheating end of the blocking device is placed under the cutting nozzle to block the cutting of the plate by the cutting nozzle;

[0010] Step S4, after the required discontinuity distance is reserved, the preheating end of the blocking device is closely attached to the cutting point of the plate, locally heats the cutting point, and moves to below the cutting nozzle;

[0011] Step S5, when the preheating end of the blocking device is impacted by fast oxygen, the blocking device is retracted, and the plate below is pierced within several seconds to form a perforation, and the plate continues to be cut.

[0012] Preferably, the blocking device is in the shape of a long strip.

[0013] Preferably, the blocking device is made of a metal material with a high melting point and free of impurities.

[0014] The preheating temperature of the blocking device is obtained by subtracting the external temperature from the melting point of the blocking device and dividing it by two.

[0015] The preheating end of the blocking device is placed below the cutting nozzle to prevent the cutting nozzle from cutting the plate and to continuously heat the preheating end.

[0016] Wherein, the temperature of the preheating end of the blocking device after heating is lower than the melting point of the blocking device and higher than the surface temperature of the plate.

[0017] Among them, the preheating end of the blocking device is close to the cutting point of the plate. When the temperature of the preheating end of the blocking device is greater than the temperature of the plate, and the preheating end of the blocking device is close to the cutting point of the plate for heat conduction, the plate is locally heated.

[0018] The blocking device is installed on the CNC straight strip flame cutting machine tool through a connecting mechanical structure.

[0019] Wherein, the connection mechanical structure includes a fixed plate, a first limiting groove, a moving platform and a second limiting groove.

[0020] Preferably, the fixing plate is provided with a first limiting groove and a fixing plate screw hole. The first limiting groove has a mechanical spring installed in the groove.

[0021] Preferably, a second limiting groove is provided in the movable platform, and a mounting opening of the blocking device is provided in the groove; and a pull rod is provided at the mounting opening of the blocking device.

[0022] Wherein, by installing the blocking device in the blocking device installation hole in the moving platform and controlling the pull rod, the blocking device can slide up and down in the second limiting groove.

[0023] In the process of cutting the plate, the flame of the cutting nozzle may be extinguished due to overheating of the cutting nozzle or splashing of iron oxide slag. The cutting nozzle can be ignited through the preheating end of the blocking device to continue the cutting work.

[0024] If the CNC straight flame cutting machine cuts with multiple cutting nozzles at the same time, the preheating end of the blocking device is close to the plate, the cutting point of the plate is locally preheated, and the plate is moved under the multiple cutting nozzles to perform perforation cutting in sequence.

[0025] When the plate moves to the cutting point, the preheating end of the blocking device is subjected to the rapid oxygen shock and penetrates the cutting point of the plate within several seconds.

[0026] Compared with the prior art, the present invention has a clear idea and is easy to implement. By placing the preheating end of the blocking device close to the starting point of cutting, when the CNC machine tool moves to the starting point of cutting, the fast oxygen quickly penetrates one end of the blocking device and penetrates the bottom plate of the iron bar within 3-4 seconds, so that the machine tool can leave points on the plate intermittently without stopping the machine tool for preheating. The cutting speed of the plate is improved while the later production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 It is a flow chart of a cutting method for intermittently leaving points during flame cutting provided by an embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of a cutting process provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic top view of a cutting process provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a plate after cutting provided by an embodiment of the present invention;

[0032] Figure 5 It is a schematic diagram of the connection structure of the blocking device provided in an embodiment of the present invention.

[0033] In the figure: 1. CNC straight strip flame cutting machine, 2. blocking device, 3. plate, 4. starting point of cutting, 5. discontinuity distance, 6. discontinuity reserved point, 7. cutting seam, 8. connecting mechanical structure, 9. pull rod, 10. fixing plate screw installation port, 11. mechanical spring, 12. blocking device installation port, 13. moving platform, 14. fixing plate, 15. first limiting groove, 16. second limiting groove. DETAILED DESCRIPTION

[0034] The following specific examples are used to illustrate the technical solution of the present invention, but the protection scope of the present invention is not limited thereto:

[0035] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] like Figure 1-5 As shown, in an embodiment of the present application, a cutting method with intermittent points in a flame cutting process is provided, comprising:

[0039] Step S1, according to the thickness of the plate 3, select the cutting nozzle model, cutting speed, oxygen and propane pressure, and determine the intermittent distance 5 to be reserved.

[0040] Specifically, before the plate 3 is cut, a relatively suitable cutting nozzle model is selected according to the thickness of the plate 3, and the outlet pressure of oxygen and propane and the cutting speed are adjusted. A reserved discontinuity distance 5 is prepared according to the shape to be processed, and the discontinuity reserved point 6 and the starting point 4 are marked.

[0041] Preferably, the thickness of the plate 3 is in the range of 6 mm to 30 mm.

[0042] Step S2, before cutting the plate 3, one end of the blocking device 2 is placed next to the cutting flame for preheating.

[0043] Specifically, before cutting begins, a metal strip with a high melting point and no impurities corresponding to the thickness of the plate 3 and the size of the cutting nozzle is selected as the blocking device 2, and one section of it is placed next to the cutting flame for preheating, and the preheating process must not affect the cutting.

[0044] Preferably, the blocking device 2 is a metal iron bar with a length of 1.5 meters and a width of 8 mm.

[0045] Step S3, during the cutting process, the plate 3 moves to the interruption reserved point 6, and the preheating end of the blocking device 2 is placed under the cutting nozzle to perform blocking cutting.

[0046] Specifically, during the cutting process of the plate 3, the plate 3 moves to the marked intermittent reserved point 6 and is placed below the cutting nozzle through the preheating end of the blocking device 2 to block the cutting flame. The plate 3 below continues to move forward with the machine tool, and at the same time, the preheating section of the blocking device 2 is continuously heated.

[0047] Step S4, after the required discontinuity distance 5 is reserved, the preheating end of the blocking device 2 is closely attached to the cutting point 4 of the plate 3, locally heats the cutting point 4, and moves to below the cutting nozzle.

[0048] Specifically, after reserving the required discontinuity distance 5, the preheating end of the blocking device 2 is placed close to the marked cutting point 4 on the plate 3, and the cutting point 4 of the plate 3 below is locally preheated through heat conduction to facilitate subsequent perforation cutting.

[0049] Step S5, when the preheating end of the blocking device 2 is impacted by fast oxygen, the blocking device 2 is retracted, and the plate 3 below is pierced within several seconds to form a perforation, and the plate 3 continues to be cut.

[0050] During the cutting process of the CNC straight strip flame cutting machine 2, the blocking device 3 is placed under the cutting nozzle for blocking cutting. After a certain distance is reserved, the red-hot end of the blocking device 3 is placed close to the plate 4, quickly moved to the bottom of the cutting nozzle, and immediately retracted; the red-hot end of the blocking device 3 touches the impact of the fast oxygen and quickly penetrates the plate.

[0051] Specifically, the preheating end of the blocking device 2 receives the impact of the fast oxygen, and the blocking device 2 is retracted, so that the fast oxygen flame penetrates the starting point of the preheating plate 3 below, and continues cutting.

[0052] In the embodiment of the present application, the blocking device 2 preheats one end to a specific temperature: (T1-T2) / 2=T3;

[0053] Wherein: T1 is the melting point of the blocking device 2, T2 is the outside temperature, and T3 is the preheating temperature. The preheating temperature is obtained by subtracting the outside temperature from the melting point of the blocking device 2 and dividing it by two.

[0054] Preferably, according to the actual operating temperature, the preheating temperature shall not exceed half of the melting point value of the blocking device 2 to prevent the blocking device from being cut due to continuous excessive heating temperature during blocking cutting.

[0055] In an embodiment of the present application, a cutting method with intermittent points during flame cutting is provided.

[0056] The preheating end of the blocking device 2 is placed below the cutting nozzle to prevent the cutting nozzle from cutting the plate 3 and to continue heating the preheating end.

[0057] The temperature of the preheating end of the blocking device 2 after heating is lower than the melting point of the blocking device 2 and higher than the surface temperature of the plate 3: T1>T4>T5;

[0058] Wherein T1 is the melting point of the blocking device 2, T4 is the temperature of the blocking device 2 after heating, and T5 is the temperature of the plate 3.

[0059] Preferably, according to the influence of the working environment temperature, the temperature of the preheating end of the blocking device 2 after heating shall not exceed the melting point of the blocking device 2 to prevent the blocking device from melting, and at the same time be greater than the surface temperature of the plate 3 for better heat conduction.

[0060] Preferably, in a specific implementation, the blocking device 2 can be manually driven to move the blocking device 2 to perform a blocking and cutting operation.

[0061] Preferably, the blocking device 2 can also be driven by a mechanical structure to move the blocking device 2 to perform a blocking and cutting operation, thereby preventing personnel from directly contacting the blocking device 2 and improving safety.

[0062] Specifically, Figure 5 As shown, in the embodiment of the present application, a connecting mechanical structure 8 is installed on the CNC straight flame cutting machine 1, and the blocking device 2 is fixed on the connecting mechanical structure 8. The blocking device 2 is driven to move by the set connecting mechanical structure 8, thereby avoiding direct manual contact with the blocking device 2.

[0063] Specifically, the installation position of the connecting mechanical structure 8 can be determined according to the actual construction situation, and it only needs to be able to drive the blocking device 2 to move and enable the blocking device 2 to be effectively moved to the designated position.

[0064] Preferably, the connecting mechanical structure 8 is composed of a fixing plate 14 , a first limiting groove 15 , a moving platform 13 , and a second limiting groove 16 .

[0065] Preferably, the fixed plate 14 is provided with a first limiting groove 15 and a fixing plate screw hole 10, and the connecting mechanical structure 8 is installed on the CNC straight flame cutting machine 1 by the fixing plate screw hole 10 on the fixing plate 14; the first limiting groove 15 has a mechanical spring 11 installed in the groove; the movable platform 13 is provided with a second limiting groove 16, and the blocking device installation hole 12 is provided in the groove; the blocking device installation hole 12 is provided with a pull rod 9.

[0066] In the embodiment of the present application, the pull rod 9 is moved to drive the blocking device 2 to move in the first limiting groove 15 and the second limiting groove 16.

[0067] Specifically, the blocking device 2 is installed in the blocking device installation port 12, and by pulling the pull rod downward or upward, the blocking device 2 slides up and down in the second limit groove 16 in the movable platform 13; by pulling the pull rod forward or backward, the blocking device 2 moves forward and backward in the first limit groove 15 in the fixed plate 14 through the movable platform 13.

[0068] like Figure 3 As shown, in an embodiment of the present application, if the CNC straight flame cutting machine 1 cuts simultaneously with multiple cutting nozzles, the preheating end of the blocking device 2 is close to the plate 3, and the cutting point 4 of the plate 3 is locally preheated, and then moved to the multiple cutting nozzles for perforation cutting in sequence.

[0069] Specifically, when the CNC straight strip cutting machine 1 cuts with multiple cutting nozzles at the same time, the preheating end of the blocking device 2 is close to the plate 3, and the cutting point 4 of the plate 3 is locally preheated, and then moved to the multiple cutting nozzles to perform perforation cutting in sequence.

[0070] In an embodiment of the present application, the multiple cutting nozzles cut simultaneously, and when the preheating end of the blocking device 2 is close to the cutting point 4 of the plate 3, when the plate 3 moves to the cutting point 4, the preheating end of the blocking device 2 is subjected to the fast oxygen shock and penetrates the cutting point 4 of the plate 3 within several seconds.

[0071] Specifically, the multiple cutting nozzles cut simultaneously, and when the plate 3 moves to the cutting starting point 4, the preheating end of the blocking device 2 is subjected to the fast oxygen shock, the blocking device 2 is retracted, and the cutting starting point 4 of the plate 3 is pierced within several seconds, causing a perforation, and the cutting continues.

[0072] In the embodiment of the present application, during the cutting process of the plate 3, if the flame of the cutting nozzle is extinguished due to overheating of the cutting nozzle or splashing of iron oxide slag, the cutting nozzle can be ignited through the preheating end of the blocking device 2 to continue the cutting work.

[0073] Specifically, the oxygen iron slag generated during the cutting process will splash into the cutting nozzle, or the cutting nozzle will melt due to long-term operation, causing the cutting nozzle to be temporarily blocked and the cutting nozzle flame to be extinguished. When the gas pressure is too high, the blockage will be cleared, and the preheating end of the blocking device 2 will be placed close to the cutting nozzle. The cutting nozzle will be ignited by relying on the high temperature of the preheating section to continue to complete the cutting work.

[0074] In summary, an embodiment of the present invention provides a cutting method for intermittently leaving points during the cutting process of a CNC straight flame cutting machine 1. After a blocking device 2 is set to block the fast oxygen from cutting a plate 3, the preheating end of the blocking device 2 is placed close to the starting point 5 of the plate 3. When the CNC machine tool moves to the starting point 5, the fast oxygen quickly penetrates the preheating end of the blocking device 2, and the blocking device 2 is retracted, so that the fast oxygen penetrates the bottom plate of the blocking device 2 within 3-4 seconds, so that the machine tool can intermittently leave points on the plate without stopping, and there is no need to stop the machine tool for preheating, thereby improving the cutting speed of the plate and improving the later production efficiency.

[0075] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for cutting with intermittent points in a flame cutting process, which is applied to the cutting process of a CNC straight strip flame cutting machine, and is characterized in that: The method comprises: Step S1, according to the thickness of the plate, select the cutting nozzle model, cutting speed, oxygen pressure and propane pressure, and determine the discontinuity distance of the discontinuity point; Step S2, before cutting the plate, one end of the blocking device is placed next to the cutting flame for preheating; Step S3, when the plate reaches the interruption reserved point during the cutting process, the preheating end of the blocking device is placed under the cutting nozzle to block the cutting of the plate by the cutting nozzle; Step S4, after the required discontinuity distance is reserved, the preheating end of the blocking device is closely attached to the cutting point of the plate, locally heats the cutting point, and moves to below the cutting nozzle; Step S5, the preheating end of the blocking device is subjected to the quick oxygen shock, the blocking device is retracted, and the plate below is pierced within a few seconds to form a perforation, and the plate continues to be cut; The preheating end of the blocking device is placed below the cutting nozzle to prevent the cutting nozzle from cutting the plate and to continuously heat the preheating end; The temperature of the preheating end of the blocking device after heating is lower than the melting point of the blocking device and higher than the surface temperature of the plate: T1>T4>T5; Where T1 is the melting point of the blocking device, T4 is the temperature of the blocking device after heating, and T5 is the temperature of the sheet; During the cutting process of the CNC straight strip flame cutting machine, a blocking device is placed under the cutting nozzle for blocking cutting. After a certain distance is reserved, one end of the blocking device is burned red and pressed against the plate, and it is quickly moved under the cutting nozzle. The preheated end of the blocking device is immediately retracted after being impacted by fast oxygen, and the cutting flame penetrates the cutting point of the plate within several seconds.

2. The method for cutting with intermittent points during flame cutting according to claim 1, characterized in that: In step S2: The specific temperature of one end of the blocking device preheating is: (T1-T2) / 2=T3; Wherein: T1 is the melting point of the blocking device, T2 is the external temperature, and T3 is the preheating temperature, which is obtained by subtracting the external temperature from the melting point of the blocking device and dividing it by two.

3. The method for cutting with intermittent points in the flame cutting process according to claim 1, characterized in that: In step S4: The preheating end of the blocking device is close to the cutting point of the plate. When the temperature of the preheating end of the blocking device is greater than the temperature of the plate, and the preheating end of the blocking device is close to the cutting point of the plate for heat conduction, the plate is locally heated.

4. The method for cutting with intermittent points during flame cutting according to claim 1, characterized in that: The blocking device is installed on the CNC straight strip flame cutting machine tool through a connecting mechanical structure.

5. The method for cutting with intermittent points during flame cutting according to claim 4, characterized in that: The connecting mechanical structure includes a fixed plate, a first limiting groove, a movable platform and a second limiting groove. The fixed plate is provided with a first limiting groove and a fixing plate screw mounting port, and a mechanical spring is installed in the first limiting groove; the movable platform is provided with a second limiting groove, and the blocking device mounting port is provided in the groove; the blocking device mounting port is provided with a pull rod.

6. The method for cutting with intermittent points during flame cutting according to claim 5, characterized in that: The pull rod operates the blocking device: The pull rod is moved to drive the blocking device to move in the first limiting groove and the second limiting groove.

7. The method for cutting with intermittent points during flame cutting according to claim 1, characterized in that: In step S3: If the CNC straight flame cutting machine cuts with multiple cutting nozzles at the same time, the preheating end of the blocking device is close to the plate, the cutting point of the plate is locally heated, and the plate is moved under the multiple cutting nozzles to perform perforation cutting in sequence.

8. The method for cutting with intermittent points during flame cutting according to claim 7, characterized in that: The multiple cutting nozzles cut simultaneously, and when the preheating end of the blocking device is close to the cutting starting point of the plate, when the plate moves to the cutting starting point, the preheating end of the blocking device is retracted by the rapid oxygen shock and penetrates the cutting starting point of the plate within several seconds.

9. The method for cutting with intermittent points in the flame cutting process according to any one of claims 1 to 7, characterized in that: During the plate cutting process, the cutting nozzle is ignited through the preheating end of the blocking device to continue the cutting work.

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