Abrasive waterjet machining process, media and apparatus for surfaces

Abstract

The application discloses a kind of suitable for surface abrasive water jet machining process method, medium and equipment, by identifying processing area and processing residual height, and according to the thin thickness of processing residual height determines cut characteristic, according to processing area selects iteration method or greedy method;Establish and use cutting process parameter model and nozzle pose parameter model, calculate to obtain cutting machining path curve function;By introducing iterative optimization method, to realize maximum material removal rate as target, but cut as condition, find the optimal cutting process parameter combination and nozzle pose parameter combination, finally complete processing.This method can effectively improve the efficiency and quality of abrasive water jet surface machining, through this method, complete machining path planning process can be obtained, including the setting of machining process parameters and nozzle pose parameters, path number, path curve function and the like, and the jet processing of complex surface has good guiding significance, and is suitable for jet processing of various materials and surface types.

Description

Technical Field

[0001] The invention relates to the technical field of water jet processing, and in particular to an abrasive water jet processing method, medium and equipment suitable for curved surfaces. Background Art

[0002] As a special processing technology, traditional abrasive water jet has been widely used in various fields due to its unique processing advantages. In actual processing, jet processing technology is often used for plate cutting and curved surface processing. Jet curved surface processing mainly uses the jet cutting effect to remove the material to be processed, so that the curved surface to be processed forms the target contour to achieve the processing purpose. However, the current jet curved surface processing technology is not mature, and generally uses straight line segments instead of jet cutting contours for processing path planning, which is quite different from the actual curved contour. Therefore, there are problems such as low processing accuracy, large residual, low efficiency and poor quality. In view of this, it is necessary to propose an abrasive water jet processing technology method suitable for curved surfaces with better accuracy, processing quality and processing efficiency. Summary of the Invention

[0003] The purpose of the present invention is to provide an abrasive water jet machining method, medium and equipment suitable for curved surfaces in response to the problems existing in the prior art.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] An abrasive water jet machining process for curved surfaces comprises the following steps:

[0006] Obtain the machining area and machining residual height of the surface to be machined;

[0007] Select the cutting type according to the machining residual height, and select the machining concept according to the machining residual height;

[0008] Randomly select parameter combinations and calculate the single cutting contour curve function and single cutting processing path curve function;

[0009] According to the single cutting contour curve function and the single cutting processing path curve function, determining whether the maximum material removal rate of the to-be-processed curved surface is the maximum value and whether there is overcutting; if the maximum material removal rate is the maximum value and there is no overcutting, water jet cutting processing is performed;

[0010] After completing a water jet cutting process, the current processing residual height is identified and compared with the standard value. If the current processing residual height is greater than the standard value, it means that the processing is not completed. The current cutting contour is retained and the current cutting contour is used as the actual contour of the surface to be processed. The process is returned and reprocessed. If the current processing residual height is greater than the standard value, the processing is completed.

[0011] The above-mentioned processing method is aimed at the current situation where the abrasive water jet surface processing method is immature and the processing effect is poor. It can effectively improve the efficiency and quality of abrasive water jet surface processing. Through this method, a complete processing path planning process can be obtained, including the setting of processing parameters and nozzle posture parameters, the number of paths, the path curve function, etc. It has a good guiding significance for the jet processing of complex surfaces and is suitable for jet processing of various materials and surface types.

[0012] Furthermore, the processing area and the processing residual height are determined as follows: identifying the actual contour curve of the surface to be processed, determining the target contour curve of the surface to be processed according to the processing requirements and processing purposes of the surface to be processed, the area between the actual contour curve and the target contour curve is recorded as the processing area, and the maximum distance between the actual contour curve and the target contour curve is recorded as the processing residual height.

[0013] Furthermore, the cutting type is selected by judging whether the machining residual height is greater than the diameter of the water jet beam, and if so, selecting the water jet thick cutting type; otherwise, selecting the water jet thin cutting type.

[0014] Furthermore, the method of selecting the processing idea is: judging the type of the processing area, if the processing area is small or uniform, selecting iterative processing, if the processing area is large or uneven, selecting greedy processing.

[0015] Furthermore, the iterative idea is to start cutting from one end of the surface to be processed, and the next cutting is planned based on the contour of the previous cutting. Each cutting is without overcutting, meets the standard value of the processing residual height and reaches the maximum material removal rate until the processing is completed; the greedy idea is to start cutting from a specific point of the surface to be processed, so that it can achieve the maximum material removal rate without overcutting. After the cutting is completed, it is determined whether to continue processing based on the processing residual height, until after a certain cutting, the processing residual height meets the standard value and the processing is completed.

[0016] Furthermore, randomly selecting a parameter combination includes randomly selecting a set of cutting process parameter combinations and randomly selecting a set of nozzle posture parameter combinations;

[0017] Inputting the selected cutting process parameter combination into the cutting process parameter model, and calculating a single cutting profile curve function corresponding to the current cutting process parameter combination;

[0018] The selected nozzle posture parameter combination is input into the nozzle posture parameter model, and the single cutting contour curve function is input into the nozzle posture parameter model to calculate the single cutting processing path curve function corresponding to the current nozzle posture parameter combination.

[0019] Furthermore, the cutting process parameter combination includes at least jet pressure, abrasive mass flow rate, traverse speed, deflection angle, abrasive diameter and type; the nozzle posture parameter combination includes at least nozzle processing incident point and nozzle processing incident angle.

[0020] Further, the maximum material removal rate of the surface to be machined is determined. If the material removal rate is not the maximum value, the process returns to the step of randomly selecting a parameter combination again. If it is the maximum value, the process proceeds to the next step.

[0021] Determine whether the surface to be processed is overcut. If so, return to the step of randomly selecting a parameter combination again. If not, proceed to the next step.

[0022] The present invention also provides a medium, which is a computer-readable storage medium. The computer-readable storage medium includes a stored program, and when the program is executed by a processor, the abrasive water jet machining process method suitable for curved surfaces as described above is implemented.

[0023] The present invention also provides a device, which is an electronic device, comprising at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the abrasive water jet machining process method suitable for curved surfaces as described above.

[0024] Compared with the prior art, the beneficial effects of the present invention are: 1. This processing technology can effectively improve the accuracy, processing efficiency and quality of abrasive water jet surface processing; 2. This processing method fully considers the characteristics of the processing area, determines the water jet cutting profile according to the processing type, process parameters and nozzle posture, adopts iterative or greedy thinking and introduces iterative optimization method for path planning, and can obtain a complete processing path planning process, including the setting of processing parameters and nozzle posture parameters, the number of paths, path curve functions, etc., which has a good guiding significance for water jet processing of complex surfaces and can achieve better practical application effects; 3. This processing method is suitable for water jet processing of a variety of materials and various complex surface types. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic flow chart of an abrasive water jet machining process for curved surfaces according to the present invention;

[0026] Figure 2 Schematic diagram of water jet thick cutting type in an embodiment of the present invention;

[0027] Figure 3 Schematic diagram of water jet thinning type in an embodiment of the present invention;

[0028] Figure 4The process diagram of the iterative concept in the embodiment of the present invention is as follows: Figure 1 ;

[0029] Figure 5 The process diagram of the iterative concept in the embodiment of the present invention is as follows: Figure 2 ;

[0030] Figure 6 This is a schematic diagram of the greedy thinking process in the embodiment of the present invention. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the greedy thinking process in the embodiment of the present invention. Figure 2 ;

[0032] In the figure: 1. Workpiece to be processed; 2. Nozzle; 3. Water jet beam; 4. Processing residual height; 5. Actual contour curve; 6. Target contour curve. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0035] Combine Figure 1 As shown, an abrasive water jet machining process suitable for curved surfaces includes the following steps:

[0036] Obtain the machining area and machining residual height of the surface to be machined, and the surface can be a complex surface;

[0037] Select the cutting type according to the machining residual height, and select the machining concept according to the machining residual height;

[0038] Randomly select parameter combinations and calculate the single cutting contour curve function and single cutting processing path curve function;

[0039] According to the single cutting contour curve function and the single cutting processing path curve function, determining whether the maximum material removal rate of the to-be-processed curved surface is the maximum value and whether there is overcutting; if the maximum material removal rate is the maximum value and there is no overcutting, water jet cutting processing is performed;

[0040] After completing a water jet cutting process, the current processing residual height is identified and compared with the standard value. If the current processing residual height is greater than the standard value, it means that the processing is not completed. The current cutting contour is retained and the current cutting contour is used as the actual contour of the surface to be processed. The process is returned and reprocessed. If the current processing residual height is greater than the standard value, the processing is completed.

[0041] This abrasive water jet machining process method identifies the machining area and machining residual height, determines the thin and thick cutting characteristics based on the machining residual height, and selects an iterative method or a greedy method based on the machining area; establishes and uses a cutting process parameter model and a nozzle posture parameter model to calculate the cutting machining path curve function; introduces an iterative optimization method with the goal of achieving the maximum material removal rate and the condition of no overcutting, finds the optimal cutting process parameter combination and nozzle posture parameter combination, and finally completes the machining.

[0042] The technical solution of the present invention addresses the situation where the current abrasive water jet surface machining process is immature and the machining effect is poor, and can effectively improve the efficiency and quality of abrasive water jet surface machining. Through this method, a complete machining path planning process can be obtained, including the setting of machining process parameters and nozzle posture parameters, the number of paths, the path curve function, etc., which has a good guiding significance for the jet machining of complex surfaces and is suitable for jet machining of various materials and surface types.

[0043] Furthermore, the processing area and the processing residual height are determined as follows: identifying the actual contour curve of the surface to be processed, determining the target contour curve of the surface to be processed according to the processing requirements and processing purposes of the surface to be processed, the area between the actual contour curve and the target contour curve is recorded as the processing area, and the maximum distance between the actual contour curve and the target contour curve is recorded as the processing residual height.

[0044] The machining residual height can be used to judge the machining quality. If the current machining residual height is greater than the standard value, it is necessary to continue planning the machining path to further reduce the residual height.

[0045] Further, such as Figure 2 and Figure 3 As shown, the method of selecting the cutting type is: judging whether the machining residual height is greater than the diameter of the water jet beam, if so, selecting the water jet thick cutting type, otherwise selecting the water jet thin cutting type.

[0046] The water jet thin cutting type is a cutting type in which the thickness of the material cut during jet beam cutting is less than the diameter of the jet beam; the water jet thick cutting type is a cutting type in which the thickness of the material cut during jet beam cutting is greater than the diameter of the jet beam. Different cutting types result in different cutting profile characteristics.

[0047] Furthermore, the method of selecting the processing idea is: judging the type of the processing area, if the processing area is small or uniform, selecting iterative processing, if the processing area is large or uneven, selecting greedy processing.

[0048] Specifically, such as Figure 4 and Figure 5 As shown, 1 is a workpiece to be processed, and a nozzle 2 ejects a water jet beam 3 from one end thereof for radial cutting processing. The water jet beam 3 will form a cutting profile. In the figure, 6 is a target profile curve, and 5 is an actual profile curve, such as the original profile. A residual height 4 will appear in the processed area. The iterative idea is to start cutting from one end of the surface to be processed, and the next cutting is planned based on the previous cutting profile. Each cutting is without overcutting, meets the standard value of the residual height, and reaches the maximum material removal rate until the processing is completed. Figure 6 and Figure 7 As shown in the figure, the greedy idea is to start cutting from a specific point on the surface to be processed so that the maximum material removal rate can be achieved without overcutting. After the cutting is completed, it is determined whether to continue processing based on the processing residual height. After a certain cutting, the processing residual height meets the standard value and the processing is completed.

[0049] Furthermore, randomly selecting a parameter combination includes randomly selecting a set of cutting process parameter combinations and randomly selecting a set of nozzle posture parameter combinations;

[0050] Inputting the selected cutting process parameter combination into the cutting process parameter model, and calculating a single cutting profile curve function corresponding to the current cutting process parameter combination;

[0051] The selected nozzle posture parameter combination is input into the nozzle posture parameter model, and the single cutting contour curve function is input into the nozzle posture parameter model to calculate the single cutting processing path curve function corresponding to the current nozzle posture parameter combination.

[0052] Furthermore, the cutting process parameter combination includes at least jet pressure, abrasive mass flow rate, traverse speed, deflection angle, abrasive diameter and type; the nozzle posture parameter combination includes at least nozzle processing incident point and nozzle processing incident angle.

[0053] Specifically, the cutting process parameter model: the input is a selected combination of main cutting process parameters (such as jet pressure, abrasive mass flow rate, traverse speed, deflection angle, abrasive particle size and type, etc.), and the output is a single cutting profile curve function. The model establishment process is to design orthogonal experiments to obtain different cutting profiles produced by cutting with different parameters, establish a mathematical relationship model between parameters and profiles through regression analysis method, and use neural network tools to optimize to improve the accuracy of the model, and finally establish the cutting process parameter model.

[0054] The nozzle posture parameter model: the input is the nozzle posture parameter combination (nozzle processing incident point, nozzle processing incident angle) and the cutting contour curve function, and the output is a single cutting processing path curve function. The model establishment process is to use a geometric method to use the starting point of the cutting contour curve as the nozzle processing incident point. If the nozzle processing incident point is changed, the cutting contour curve is changed by a translation method. If the nozzle processing incident angle is changed, the cutting contour curve is changed by a rotation method. The changed curve is recorded as the processing path curve function.

[0055] Through multiple preliminary experiments, we explored the effects of different process parameters and nozzle postures on the characteristics of the cutting contour. We used machine learning and other methods to establish a prediction model, which allows us to input specific process parameters and nozzle postures and output the corresponding predicted cutting contour. We also continuously optimized the model through deep learning and other methods to make the results more reliable.

[0056] Further, the maximum material removal rate of the surface to be machined is determined. If the material removal rate is not the maximum value, the process returns to the step of randomly selecting a parameter combination again. If it is the maximum value, the process proceeds to the next step.

[0057] Determine whether the surface to be processed is overcut. If so, return to the step of randomly selecting a parameter combination again. If not, proceed to the next step. Example 2

[0058] The present invention also provides a medium, which is a computer-readable storage medium, and the computer-readable storage medium includes a stored program, and when the program is executed by a processor, the abrasive water jet machining process method suitable for curved surfaces as described in Example 1 is implemented.

[0059] The present invention also provides an electronic device, which includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the abrasive water jet machining method applicable to curved surfaces as described above. Figure 1 As shown, the steps are as follows:

[0060] S1: Identify the actual contour curve of the surface to be processed, determine the target contour curve of the surface to be processed according to the processing requirements and processing objectives, record the area between the actual contour curve and the target contour curve as the processing area, and record the maximum distance between the actual contour curve and the target contour curve as the processing residual height;

[0061] S2: Determine whether the machining residual height is greater than the diameter of the water jet beam. If so, select the water jet thick cutting type; otherwise, select the water jet thin cutting type;

[0062] S3: Determine the type of the processing area. If the processing area is small or uniform, select iterative processing. If the processing area is large or uneven, select greedy processing.

[0063] S4: Randomly select a set of cutting process parameter combinations and a set of nozzle posture parameter combinations;

[0064] S5: inputting the selected cutting process parameter combination into a cutting process parameter model, and calculating a single cutting profile curve function corresponding to the current cutting process parameter combination;

[0065] S6: inputting the selected nozzle posture parameter combination into the nozzle posture parameter model, and inputting the single cutting contour curve function obtained in S5 into the nozzle posture parameter model, and calculating the single cutting processing path curve function corresponding to the current nozzle posture parameter combination;

[0066] S7: Determine the maximum material removal rate of the surface to be machined. If the material removal rate is not the maximum value, return to step S4. If it is the maximum value, proceed to the next step (S8).

[0067] S8: Determine whether the surface to be processed is overcut, if so, return to step S4, if not, proceed to the next step (S9);

[0068] S9: After completing a water jet cutting process, identify the current processing residual height and compare it with the standard value. If the current processing residual height is greater than the standard value, it means that the processing is not completed, then retain the current cutting contour, and use the current cutting contour as the actual contour of the surface to be processed next time, return to S1 and start again. If the current processing residual height is greater than the standard value, the processing is completed.

[0069] By executing the above steps, abrasive water jet processing can be performed on complex surfaces. It fully considers the characteristics of the workpiece area to be processed, determines the jet cutting contour according to the processing type, process parameters and nozzle posture, adopts iterative or greedy thinking and introduces iterative optimization methods for path planning, greatly improving the accuracy, processing quality and processing efficiency of jet surface processing, and is also highly applicable.

[0070] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired or wireless method. The computer-readable storage medium can be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrated. The available medium can be a magnetic medium, an optical medium, or a semiconductor medium, etc.

[0071] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for abrasive water jet machining of curved surfaces, characterized in that: The steps include: Obtain the machining area and machining residual height of the surface to be machined; Select the cutting type according to the machining residual height, and select the machining concept according to the machining residual height; Randomly select parameter combinations and calculate the single cutting contour curve function and single cutting processing path curve function; According to the single cutting contour curve function and the single cutting processing path curve function, determining whether the maximum material removal rate of the to-be-processed curved surface is the maximum value and whether there is overcutting; if the maximum material removal rate is the maximum value and there is no overcutting, water jet cutting processing is performed; After completing a water jet cutting process, the current machining residual height is identified and compared with the standard value. If the current machining residual height is greater than the standard value, it means that the machining is not completed. The current cutting contour is retained and the current cutting contour is used as the actual contour of the surface to be machined. The process is returned and re-processed. If the current machining residual height is greater than the standard value, the machining is completed. The machining area and the machining residual height are determined as follows: an actual contour curve of the surface to be machined is identified, and a target contour curve of the surface to be machined is determined according to the machining requirements and machining objectives of the surface to be machined; the area between the actual contour curve and the target contour curve is recorded as the machining area, and the maximum distance between the actual contour curve and the target contour curve is recorded as the machining residual height; The method of selecting the cutting type is as follows: judging whether the machining residual height is greater than the diameter of the water jet beam, if so, selecting the water jet thick cutting type, otherwise selecting the water jet thin cutting type; The method of selecting the processing idea is as follows: judging the type of the processing area, if the processing area is small or uniform, then selecting iterative processing; if the processing area is large or uneven, then selecting greedy processing; The iterative idea is to start cutting from one end of the surface to be processed, and the next cutting is planned based on the contour of the previous cutting. Each cutting is without overcutting, meets the standard value of the processing residual height and reaches the maximum material removal rate until the processing is completed; the greedy idea is to start cutting from a specific point of the surface to be processed, so that it can achieve the maximum material removal rate without overcutting. After the cutting is completed, it is determined whether to continue processing based on the processing residual height, until after a certain cutting, the processing residual height meets the standard value and the processing is completed.

2. The abrasive water jet machining process for curved surfaces according to claim 1, characterized in that: Randomly selecting parameter combinations includes randomly selecting a set of cutting process parameter combinations and randomly selecting a set of nozzle posture parameter combinations; Inputting the selected cutting process parameter combination into the cutting process parameter model, and calculating a single cutting profile curve function corresponding to the current cutting process parameter combination; The selected nozzle posture parameter combination is input into the nozzle posture parameter model, and the single cutting contour curve function is input into the nozzle posture parameter model to calculate the single cutting processing path curve function corresponding to the current nozzle posture parameter combination.

3. The abrasive water jet machining method for curved surfaces according to claim 2, characterized in that: The cutting process parameter combination includes at least jet pressure, abrasive mass flow rate, traverse speed, deflection angle, abrasive diameter and type; the nozzle posture parameter combination includes at least nozzle processing incident point and nozzle processing incident angle.

4. The abrasive water jet machining process for curved surfaces according to claim 1, characterized in that: Determine the maximum material removal rate of the surface to be machined. If the material removal rate is not the maximum, return to the step of randomly selecting a parameter combination again. If it is the maximum, proceed to the next step. Determine whether the surface to be processed is overcut. If so, return to the step of randomly selecting a parameter combination again. If not, proceed to the next step.

5. A medium, which is a computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, and when the program is executed by a processor, the abrasive water jet machining method for curved surfaces according to any one of claims 1 to 4 is implemented.

6. A device, which is an electronic device, characterized in that: The electronic device includes at least one processor and at least one memory connected to the processor; wherein the processor is used to call program instructions in the memory to execute the abrasive water jet machining method suitable for curved surfaces as described in any one of claims 1 to 4.

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