Efficient trimming programming method for composite cutting disc

Abstract

The invention belongs to the technical field of composite material processing, and provides an efficient trimming programming method for a composite material cutting disc, which comprises the following steps: confirming and optimizing a product contour processing area; establishing a disc cutter model; generating a processing track according to the product contour processing area; machining parameters are set; performing post-processing on the tool path to generate a CNC program, and improving the program after simulation processing; and the program is delivered to the site for processing. The technical problems of contour edge layering, low machining efficiency and high cost in the edge cutting machining process are solved, and the machining efficiency and quality of products are improved while the requirement for the machining precision of the products is met.

Description

Technical Field

[0001] This invention belongs to the field of aerospace composite material parts processing technology, specifically relating to a CNC programming method for efficient edge cutting of composite material disc cutters. Background Technology

[0002] After composite material parts are molded, a large amount of residual material remains at the contour edges, requiring trimming to remove this excess. Trimming is generally performed using two methods: manual trimming with a disc cutter, or trimming using a CNC machine tool or robot with a milling cutter. Manual trimming has low precision and poor edge quality, but it allows for one-time toolpath removal of the contour. Machine tool or robot trimming offers high precision and excellent edge quality. However, due to the anisotropy of composite materials, the trimming process is prone to delamination or cracking, requiring continuous optimization and control of cutting parameters and paths. Multiple layer cuts using the same toolpath are generally necessary to achieve complete edge trimming. Furthermore, the reinforcing fibers in the composite material exacerbate tool wear, significantly increasing manufacturing costs.

[0003] Currently, composite material edge trimming technology based on CNC machine tools or robots dominates the market. The main process involves programming CNC or robot machining, verifying the program through simulation, and then trimming the product. In this process, the quality of the CNC program directly determines the quality and efficiency of the trimming. During the trimming process, quality defects are easily generated at the tool entry and exit points, with occasional damage to the contour edges, resulting in slight delamination, whitening, and other defects. To avoid the impact of the tool entry and exit processes on the trimming quality, extensive modifications to the toolpaths at these points are usually required. Besides the entry and exit points, toolpaths at corners and right angles also require significant manual modifications, consuming considerable manpower and time. Furthermore, these modified toolpaths typically reduce the product's processing efficiency.

[0004] In the current CNC programming process for edge trimming of composite material parts, to ensure product quality, it is usually necessary to repeatedly modify and improve the tool path, but it is still impossible to completely avoid the occurrence of delamination at the contour edge. When programming, the side cutting method of the end mill is generally used. The whole process is a full depth of cut. Due to the inherent properties of the material and quality requirements, a large depth of cut cannot be used, resulting in low machining efficiency of the programmed process.

[0005] The purpose of this invention is to provide a CNC programming method for efficient edge cutting of composite material parts using a disc cutter, solving the problems of long programming time and low program processing efficiency in existing processing technologies. Summary of the Invention

[0006] This invention addresses the problems of edge delamination, low processing efficiency, and high cost in existing edge trimming processes by providing a CNC programming method for efficient edge trimming of composite material parts using a disc cutter. This method improves processing efficiency and quality while ensuring product processing accuracy requirements and reducing the occurrence of delamination.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A high-efficiency edge-cutting programming method for composite material disc cutters includes the following steps: Product outline processing area confirmation and optimization; Create a model of the disc-shaped cutting tool; Generate a processing trajectory based on the processing area of ​​the product outline; Set processing parameters; Post-process the tool path to generate a CNC program, and improve the program after simulation machining; The program is delivered to the site for on-site processing.

[0008] As a further aspect of the present invention: the confirmation of the product contour processing area specifically includes: The processing area is determined based on the product's process requirements and actual processing capacity.

[0009] As a further aspect of the present invention: the optimization of the product contour processing area specifically involves: after the processing area is determined, the contour side is improved, the entire processing area is established as a single plane, and corresponding offset or extension processing is performed according to the processing requirements, wherein the processing requirements refer to processing with negative tolerance or processing with reserved contour allowance.

[0010] As a further aspect of the present invention: the establishment of the disc tool model specifically involves: determining the disc tool material based on the characteristics of the composite material, determining the tool geometry parameters based on the actual product situation, selecting the disc tool specifications based on the disc tool material and geometry parameters, and establishing the disc tool model according to the actual tool model.

[0011] As a further aspect of the present invention: the step of generating a machining trajectory based on the product contour machining area specifically involves: using UG software, taking the side of the product as the side of the contour machining, and the bottom surface of the product contour as the auxiliary plane, to automatically generate a tool trajectory route.

[0012] As a further aspect of the present invention: after the path is generated, the transition areas of the arcs and the long straight lines are processed by using appropriate short pauses.

[0013] As a further aspect of the present invention: the setting of the processing parameters is specifically as follows: based on the results of the process test, the processing speed is designed to be 3000 rpm, the feed rate is 300 mm / min, and the depth of cut is full depth of cut.

[0014] As a further aspect of the present invention: the post-processing of the tool path to generate a CNC program, and the improvement of the program after simulation machining, specifically involves: post-processing the tool path to generate a CNC program, using machining simulation software to simulate the CNC machining program, and checking for collision interference and abnormal tool entry / exit issues.

[0015] As a further aspect of the present invention: post-processing refers to converting the tool path generated by UG software into a CNC program executable by a CNC machine tool using a post-processing program.

[0016] As a further aspect of the present invention: In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows: 1. This application incorporates the disc cutter used for manual edge trimming into a mechanized edge trimming process based on CNC machine tools. By programming a CNC machining trajectory suitable for disc cutter contour trimming, post-processing the machining trajectory to generate a CNC program and machining simulation, and then delivering the CNC program to the field, automatic edge trimming is achieved based on the CNC machine tool. This realizes the automatic edge trimming application of the disc cutter, improving production efficiency and reducing processing costs while ensuring machining quality.

[0017] 2. This application has been applied in the processing of multiple products. Processing efficiency has been improved by approximately 30%, processing accuracy is within ±0.15mm, and no delamination of composite materials has occurred, reducing processing costs by approximately 30%. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the efficient edge-cutting programming method for composite material disc cutters according to the present invention. Figure 2 This is a schematic diagram of the product structure and contour processing area of ​​the present invention; Figure 3 This is a schematic diagram of the disc cutter model of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be described in more detail below with reference to the accompanying drawings.

[0020] In the accompanying drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present invention.

[0021] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] The following is in conjunction with the appendix Figure 1-3 The embodiments of the present invention will be described in detail below.

[0023] Example 1 A composite material product (such as...) Figure 2 (As shown) CNC programming method: The CNC programming method is as follows: Step 1: Confirm and optimize the product outline processing area. Based on the product's process requirements and actual processing capabilities, determine the processing area (e.g., ...). Figure 2 (As shown). After the processing area is determined, the contour sides are refined, the entire processing area is established as a single plane, and corresponding offset or extension processing is performed according to processing requirements (such as processing with negative tolerance or processing with contour allowance). Step 2: Disc Tool Creation. Create a disc tool model based on the actual tool model. The result of the tool model creation is as follows: Figure 3 As shown; Step 3: Machining trajectory generation and optimization. Based on UG software, the bottom and side surfaces are used as the outer contour for machining the sides. The bottom surface of the contour is used as an auxiliary plane to automatically generate the tool path, and manual optimization is performed on the tool path at stress concentration points and tool entry / exit points. Step 4: Set the machining parameters. Based on manual experience and process test results, design the machining speed as 3000 rpm, the feed rate as 300 mm / min, and the depth of cut as full depth of cut. Step 5: Post-process the tool path to generate a CNC program (post-processing: convert the tool path generated by UG software into a CNC program that can be executed by the CNC machine tool using a post-processing program), and use machining simulation software to simulate the CNC machining program to check for collision interference and abnormal tool entry and exit issues; Step 6: The program is delivered to the site for on-site processing.

[0024] Example 2 To address the shortcomings of current CNC programming for trimming composite parts, a highly efficient trimming programming method for composite disc cutters is proposed. The method mainly consists of two aspects: machining process planning and CNC programming control.

[0025] In terms of process planning, the main contents include the following: 1. Confirmation and optimization of the contour machining area: First, determine the machining contour line according to the product process requirements, and optimize the contour surface where the machining contour line is located so that the CAM software can generate an excellent cutting trajectory path; second, determine the starting point and ending point of the cutting edge, and segment the stress concentration areas such as corners and connections, and treat this part as a separate machining area; finally, mark and remove areas that cannot be machined due to tool interference and other factors, thereby determining the machining area; 2. Establish a disc tool model: Based on the properties of composite materials, confirm the material of the disc tool, and determine the tool geometry parameters according to the actual product conditions; 3. Set cutting parameters: Select appropriate spindle speed and feed rate based on material properties and manual cutting experience. In terms of depth of cut, the disc cutter adopts a one-time cutting method to achieve complete cutting of the contour.

[0026] In terms of CNC programming control, the main contents include the following: 1. Machining Path Generation and Optimization: During CNC programming, a contour machining method is adopted, using the side contact surface of the disc cutter as the side surface and the surface parallel to the bottom surface of the disc cutter as the bottom surface. UG software is used to automatically generate the cutting trajectory path. After the path is generated, appropriate short pauses are used for areas such as arc transitions and long straight lines to reduce the burden on the tool during machining and minimize stress concentration and delamination risks.

[0027] 2. Post-processing and verification of the program: The automatically generated toolpath is post-processed to generate a CNC program, which is then imported into the machining simulation software to simulate the entire machining process and check for collision risks and unreasonable tool advances and retreats.

[0028] Thus, the objective of this invention has been achieved.

[0029] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-efficiency edge-cutting programming method for composite material disc cutters, characterized in that, Includes the following steps: Product outline processing area confirmation and optimization; Create a model of the disc-shaped cutting tool; Generate a processing trajectory based on the processing area of ​​the product outline; Set processing parameters; Post-process the tool path to generate a CNC program, and improve the program after simulation machining; The program is delivered to the site for on-site processing.

2. The efficient edge-cutting programming method for composite material disc cutters according to claim 1, characterized in that, The confirmation of the product contour processing area specifically includes: The processing area is determined based on the product's process requirements and actual processing capacity.

3. The efficient edge-cutting programming method for composite material disc cutters according to claim 2, characterized in that, The optimization of the product contour processing area is as follows: after the processing area is determined, the contour side is improved, the entire processing area is established as a single plane, and corresponding offset or extension processing is carried out according to the processing requirements. The processing requirements refer to processing with negative difference or processing with contour reserved allowance.

4. The efficient edge-cutting programming method for composite material disc cutters according to claim 1, characterized in that, The establishment of the disc tool model specifically involves: determining the disc tool material based on the characteristics of the composite material, determining the tool geometry parameters based on the actual product situation, selecting the disc tool specifications based on the disc tool material and geometry parameters, and establishing the disc tool model according to the actual tool model.

5. The efficient edge-cutting programming method for composite material disc cutters according to claim 1, characterized in that, The process of generating a machining trajectory based on the product contour machining area is as follows: using UG software, the side of the product is used as the machining side of the contour; the bottom surface of the product contour is used as the auxiliary plane, and the tool trajectory route is automatically generated.

6. The efficient edge-cutting programming method for composite material disc cutters according to claim 5, characterized in that, After the path is generated, appropriate short pauses are used to process the transitions between arcs and long straight lines.

7. The efficient edge-cutting programming method for composite material disc cutters according to claim 1, characterized in that, The specific machining parameters are as follows: based on the process test results, the machining speed is designed to be 3000 rpm, the feed rate is 300 mm / min, and the depth of cut is full depth of cut.

8. The efficient edge-cutting programming method for composite material disc cutters according to claim 1, characterized in that, The process of post-processing the tool path to generate a CNC program and then simulating the machining process to improve the program involves: post-processing the tool path to generate a CNC program, using machining simulation software to simulate the CNC machining program, and checking for collision interference and abnormal tool entry / exit issues.

9. The efficient edge-cutting programming method for composite material disc cutters according to claim 8, characterized in that, Post-processing refers to converting the toolpath generated by UG software into a CNC program that can be executed by a CNC machine tool using a post-processing program.

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