Numerical control blanking machining method for special-shaped hole

Abstract

The invention provides a numerical control blanking machining method for a special-shaped hole, and belongs to the technical field of numerical control machining, in particular, the contour of the special-shaped hole comprises an arc-shaped section, the central angle of the arc-shaped section is larger than or equal to 270 degrees, at least one end of the arc-shaped section is connected with a linear section, and the connecting point of the end of the arc-shaped section and the linear section is a first intersection point; the numerical control blanking machining method comprises the following steps that machining of the special-shaped hole is divided into trepanning machining and milling machining; the circle center of the trepanning is the circle center of the arc-shaped section, and the diameter is the diameter of the arc-shaped section; the milling contour line comprises a linear section, the milling cutter enters the arc range of the arc section, and the first intersection point is within the milling range. By means of the processing scheme, the machining precision and efficiency of the special-shaped hole and the product quality are improved.

Description

Technical Field

[0001] This application relates to the field of CNC machining, and in particular to a CNC blanking method for irregular holes. Background Technology

[0002] Aircraft sheet metal parts are diverse and complex in structure, sharing common production characteristics while also possessing unique manufacturing features. Among them, irregularly shaped holes on parts, due to their special functions, exhibit complex geometric shapes with non-standard contours and multiple integrated features. Traditionally, when processing irregularly shaped holes, different dies are manufactured according to different hole shapes, and the holes are punched using a punch press to complete the processing, or the outer contour reference lines are drawn based on a template, and the holes are made manually using special tools.

[0003] With the promotion of digital technology, CNC technology has been widely used in sheet metal machine tools, and CNC blanking has become a typical processing method in the blanking process of aircraft sheet metal parts. However, when CNC blanking sheet metal parts with irregular holes, due to the special shape or size of some irregular holes, conventional CNC machining methods cannot mill out the complete or critical contours of the holes, requiring manual finishing with special tools. Therefore, the existing processing still suffers from problems such as unstable machining accuracy, low efficiency, and machining errors. Summary of the Invention

[0004] In view of this, this application provides a CNC blanking method for irregular holes, which solves the problems in the prior art and improves the processing accuracy, efficiency and product quality of irregular holes.

[0005] The CNC blanking method for irregularly shaped holes provided in this application adopts the following technical solution: A CNC blanking method for machining irregularly shaped holes, wherein the contour of the irregularly shaped hole includes an arc segment, the central angle of the arc segment being greater than or equal to 270°, and at least one end of the arc segment is connected to a straight segment, the connection point of the end of the arc segment and the straight segment being a first intersection point. The CNC blanking process includes the following steps: The machining of irregular holes is divided into hole drilling and milling. The center of the hole is the center of the arc segment, and the diameter is the diameter of the arc segment; The contour line of the milling process includes straight line segments, and the milling cutter enters the arc range of the arc segment, with the first intersection point within the milling process range.

[0006] Optionally, one end of the arc segment is connected to a straight line segment, and the other end of the arc segment is connected to a shaped line segment, the intersection of the shaped line and the arc segment being the second intersection point; The contour line of the milling process includes straight line segments and profile segments, and the milling cutter enters the arc range of the arc segment, with the first intersection point and the second intersection point within the milling process range.

[0007] Optionally, the irregularly shaped hole may be a closed hole or an open hole.

[0008] Optionally, the hole-making process is drilling, with the diameter of the drill bit being the same as the diameter of the arc segment.

[0009] Optionally, the distance L between the first and second intersection points, the radius r of the arc segment, and the maximum radius R of the milling cutter are... .

[0010] Optionally, the execution order of the hole-making and milling processes is as follows: complete all hole-making processes first, and then perform milling processes, and the machining accuracy of the hole-making processes meets the reference requirements of the milling processes.

[0011] In summary, this application includes the following beneficial technical effects: This application can reliably mill out the complete or critical contours of irregular holes, minimize manual labor, improve the machining accuracy and product quality of irregular holes, and adapt to the complex and ever-changing machining needs of aircraft sheet metal parts. It meets the requirements of multi-variety and small-batch manufacturing of aircraft sheet metal parts, saves the need for punching dies required by traditional machining methods, reduces manufacturing costs, and improves production efficiency.

[0012] Moreover, it does not require modification of existing CNC machining equipment, programming software, or new machining tools. It only requires grouping and processing of the two-dimensional graphics of CNC blanking. The specific operation is simple, convenient, and highly practical, and has good potential for widespread application. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 Schematic diagram of irregular hole structure on workpiece; Figure 2 This is a schematic diagram of the machining of irregular holes in Example 1; Figure 3 This is a processing diagram of the irregular hole in Example 2.

[0015] Explanation of reference numerals in the attached diagram: 1. Irregular hole; 2. Arc segment; 3. Straight segment; 4. Straight segment; 5. Profile segment; 6. Hole-making area; 7. Milling area. Detailed Implementation

[0016] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0017] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0019] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0021] This application provides a CNC blanking method for irregular hole machining.

[0022] like Figures 1 to 3 As shown, the outline of the irregular hole 1 includes an arc segment 2, the central angle of the arc segment 2 is greater than or equal to 270°, at least one end of the arc segment 2 is connected to a straight segment 4, and the connection point between the end of the arc segment 2 and the straight segment 4 is the first intersection point.

[0023] A CNC blanking method for irregularly shaped holes includes the following steps: The machining of irregular hole 1 is divided into hole drilling and milling. The center of the hole is the center of arc segment 2, and the diameter is the diameter of arc segment 2; The contour line of the milling process includes straight line segment 4, and the milling cutter enters the arc range of arc segment 2, with the first intersection point within the milling process range.

[0024] Example 1: like Figure 1 and Figure 2 As shown, the irregular hole 1 is a closed hole composed of an arc-shaped segment 2 and a straight segment 3. The end of the straight segment 3 furthest from the arc-shaped segment 2 has a rounded corner, and the two straight edges of the straight segment 3 are parallel to each other. The CNC blanking process is as follows: The machining of the irregular hole 1 is divided into hole-making and milling. The execution order of hole-making and milling is as follows: first, the machining of all hole-making areas 6 is completed, and then the milling of milling areas 7 is performed. The machining accuracy of hole-making meets the reference requirements of milling.

[0025] The center of the hole is the center of arc segment 2, and the diameter is the diameter of arc segment 2; The milling profile includes the profile of the straight segment 3, which includes the two straight segments 4 of the straight segment 3, the rounded corner area, and the first intersection point of the straight segment 3 and the curved segment 2. During milling, the milling profile extends along the two straight segments 4 of the straight segment 3 into the curved segment 2 to ensure that the milling area covers the intersection point of the straight segment 3 and the curved segment 2. The diameter of the milling cutter is smaller than the distance between the two straight segments 4 of the straight segment 3.

[0026] The hole-making process involves drilling, with the diameter of the drill bit matching the diameter of the arc segment 2.

[0027] Example 2: like Figure 1 and Figure 3 As shown, the irregular hole 1 is an open hole, including an open arc-shaped segment 2. One end of the arc-shaped segment 2 is connected to a straight segment 4, and the other end is connected to an arc-shaped profile. The CNC blanking process is as follows: The machining of the irregular hole 1 is divided into hole-making and milling. The execution order of hole-making and milling is as follows: first, the machining of all hole-making areas 6 is completed, and then the milling of milling areas 7 is performed. The machining accuracy of hole-making meets the reference requirements of milling.

[0028] The center of the hole is the center of arc segment 2, and the diameter is the diameter of arc segment 2; The contour line of the milling process includes a straight line segment 4 and a profile segment 5, and the milling cutter enters the arc range of the arc segment 2. The first intersection point and the second intersection point are within the range of the milling process.

[0029] The hole-making process involves drilling, with the diameter of the drill bit matching the diameter of the arc segment 2.

[0030] The distance L between the first and second intersection points, the radius r of the arc segment, and the maximum radius R of the milling cutter are given. .

[0031] This application presents a method for machining irregularly shaped holes on aircraft sheet metal parts. It enables CNC blanking of these holes, eliminating the need for dies required in traditional methods, reducing manufacturing costs, and improving production efficiency. The method can reliably mill the complete or critical contours of irregularly shaped holes, minimizing manual labor, improving machining accuracy and product quality, and adapting to the complex and varied machining needs of aircraft sheet metal parts, meeting the requirements of multi-variety, small-batch manufacturing. Furthermore, this method requires no modification to existing CNC machining equipment, programming software, or additional machining tools; it only requires grouping the two-dimensional CNC blanking graphics. The operation is simple, convenient, and highly practical, with good potential for widespread application.

[0032] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A CNC blanking method for irregularly shaped holes, characterized in that, The contour of the irregular hole includes an arc segment with a central angle greater than or equal to 270°. At least one end of the arc segment is connected to a straight segment, and the point where the end of the arc segment and the straight segment meet is the first intersection point. The CNC blanking process includes the following steps: The machining of irregular holes is divided into hole drilling and milling. The center of the hole is the center of the arc segment, and the diameter is the diameter of the arc segment; The contour line of the milling process includes straight line segments, and the milling cutter enters the arc range of the arc segment, with the first intersection point within the milling process range.

2. The CNC blanking method for irregularly shaped holes according to claim 1, characterized in that, One end of the arc segment is connected to a straight line segment, and the other end of the arc segment is connected to a shaped line segment. The intersection of the shaped line segment and the arc segment is the second intersection point. The contour line of the milling process includes straight line segments and profile segments, and the milling cutter enters the arc range of the arc segment, with the first intersection point and the second intersection point within the milling process range.

3. The CNC blanking method for irregularly shaped holes according to claim 1, characterized in that, The irregularly shaped hole may be a closed or open hole.

4. The CNC blanking method for irregularly shaped holes according to claim 1, characterized in that, The drilling process involves drilling, with the diameter of the drill bit matching the diameter of the arc segment.

5. The CNC blanking method for irregularly shaped holes according to claim 2, characterized in that, The distance L between the first and second intersection points, the radius r of the arc segment, and the maximum radius R of the milling cutter are given. .

6. The CNC blanking method for irregularly shaped holes according to claim 1, characterized in that, The execution order of the hole-making and milling processes is as follows: first complete all hole-making processes, then perform milling processes, and the machining accuracy of the hole-making processes meets the reference requirements of the milling processes.

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