A circuit board with an attached edge and its milling processing method

Abstract

The present invention relates to a circuit board with an attached edge and a milling processing method therefor. Among them, a circuit board with an attached edge includes: at least one unit board, the top corners of the unit board are rounded, and at least one groove is provided on the side of the unit board; at least one attached edge is provided on one side of the at least one unit board; the attached edge is fixedly connected to the at least one unit board, and milling advance and retreat allowance parts are provided at positions corresponding to the rounded corners and the grooves. By designing an allowance part on the process attached edge, the present invention can achieve complete milling processing of the junction position between the unit board and the attached edge when milling the junction of the unit board and the attached edge, solves the problem of small sharp corners or burrs, and at the same time, during the milling process, the allowance part provides a working allowance for the milling cutter, not only realizes the milling processing of the junction, but also avoids the milling cutter from contacting the unit board, ensuring the integrity of the unit board.

Description

Technical Field

[0001] The present invention relates to the field of circuit board manufacturing, and in particular to a circuit board with an attached edge and a milling processing method therefor. Background Art

[0002] In the manufacturing process of PCB circuit boards, in most cases, the shape of the unit board is non-square, but the connection between the unit board and the process attached edge is a rounded edge or a concave design. If milling processing is carried out according to the original design, when the boards are separated for use, there will be problems such as incomplete shape or small sharp corners or burrs at the joint of the attached edge. At present, in order to prevent mistakes in the case of incomplete or small sharp corners or burrs after board separation, a design method of milling into the attached edge is adopted. However, in the current technical solutions, at the position where the unit board intersects with the attached edge, when milling the junction of the unit board and the attached edge, due to the certain size of the milling cutter, it is impossible to perform complete milling processing on the junction, and there will be residues after the attached edge is separated from the unit board, resulting in an uneven shape. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this reason, the purpose of the embodiments of the present invention is to provide a circuit board with an attached edge and a milling processing method therefor, which can ensure the integrity of the shape of the unit board, there will be no residues after board separation, no additional quality risks will be added, and no additional costs are required.

[0004] The technical solution adopted by the embodiments of the present invention is as follows:

[0005] In a first aspect, the embodiments of the present invention provide a circuit board with an attached edge, including:

[0006] At least one unit board, the top corners of the unit board are rounded, and grooves are provided on the sides of the unit board;

[0007] The side is also connected with an attached edge;

[0008] The attached edge is detachably connected to the side, and milling advance and retreat allowance parts are provided at positions corresponding to the rounded corners and the grooves. The milling advance and retreat allowance parts provide a working space for the milling cutter. A rounded corner milling advance and retreat allowance part is correspondingly provided at the rounded corner, and a groove milling advance and retreat allowance part is correspondingly provided at the groove.

[0009] Further, a combined milling advance and retreat allowance part is provided at the rounded corner joint between at least one of the unit boards.

[0010] Further, the combined milling advance and retreat allowance part is a semi-closed mechanism. The combined milling advance and retreat allowance part and the two rounded corners of the rounded corner joint together form a closed mechanism. The distance between the two ends of the open side of the closed mechanism is greater than the distance between the tangent points of the rounded corner and the attached edge.

[0011] Furthermore, the retraction depth of the groove milling retraction part is 0.3 mm - 1.2 mm.

[0012] Furthermore, the depth of the groove is 0.3 mm - 1.2 mm.

[0013] In a second aspect, an embodiment of the present invention provides a milling processing method for a circuit board, which is applied to the circuit board with an attached edge described above. The method includes: milling processing of the fillet, the groove and the fillet joint.

[0014] Furthermore, the milling processing of the fillet, the groove and the fillet joint is as follows: the milling cutter is respectively inserted into the fillet milling retraction part, the groove milling retraction part and the joint milling retraction part to realize the milling processing of the fillet, the groove and the fillet joint.

[0015] Furthermore, it includes: the diameter of the milling cutter is 0.6 mm - 2.4 mm.

[0016] Furthermore, the retraction depth of the groove milling retraction part is 0.3 mm - 1.2 mm.

[0017] Furthermore, the depth of the groove is 0.3 mm - 1.2 mm.

[0018] The beneficial effects of the present invention are as follows:

[0019] By designing a retraction part on the process attached edge, the present invention can completely mill the junction position when milling the junction of the unit board and the attached edge, solve the problem of small sharp corners or burrs. At the same time, during the milling process, the retraction part provides a working allowance for the milling cutter, not only realizing the milling of the junction of the unit board and the attached edge, but also preventing the milling cutter from contacting the unit board and ensuring the integrity of the unit board. Description of the Drawings

[0020] Figure 1 is a schematic structural diagram of a circuit board with an attached edge in the prior art;

[0021] Figure 2 is a schematic structural diagram of a circuit board with an attached edge in Embodiment 1 of the present invention;

[0022] Figure 3 is a schematic structural diagram of a fillet milling retraction part in Embodiment 1 of the present invention (enlarged view at A);

[0023] Figure 4 is a schematic structural diagram of a groove milling retraction part in Embodiment 1 of the present invention (enlarged view at B);

[0024] Figure 5It is a schematic structural diagram (magnified view at C) of the milling feed and retreat part in the embodiment of the present invention;

[0025] Figure 6 It is a schematic structural diagram of a circuit board with an attached edge in the second embodiment of the present invention;

[0026] Figure 7 It is a schematic structural diagram (magnified view at D) of a rounded corner milling feed and retreat part in the second embodiment of the present invention;

[0027] Figure 8 It is a schematic structural diagram of a circuit board with an attached edge in the third embodiment of the present invention;

[0028] Figure 9 It is a schematic structural diagram of a circuit board with an attached edge in the third embodiment of the present invention.

[0029] Reference numerals

[0030] 1. Unit board; 2. Attached edge; 3. Rounded corner; 31. Rounded corner joint; 4. Groove; 5. Retreat depth; 21. Rounded corner milling feed and retreat part; 22. Groove milling feed and retreat part; 23. Joint milling feed and retreat part. Detailed implementation manners

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0032] To better understand the technical solutions of the embodiments of the present invention, the key terms involved in the embodiments are first explained:

[0033] Attached edge: That is, the part additionally provided on the side edge of the unit circuit board, which is convenient for users to play roles such as positioning and connection during use, and users will remove the attached edge when finally using the circuit board.

[0034] Embodiment 1

[0035] See Figures 2 - 5 , Embodiment 1 provides a circuit board with an attached edge 2, and the circuit board with an attached edge 2 includes:

[0036] Two unit boards 1, the top corners of the unit board 1 are rounded corners 3, and at least one groove 4 is provided on the side edge of the unit board 1; The attached edge is detachably connected to both sides of the two unit boards 1, and an attached edge 2 is detachably provided on one side of the unit board group after combination.

[0037] A milling advance and retreat allowance portion is provided at the corresponding positions of the rounded corner 3, the groove 4, and the joint of the two unit plates 1. In this embodiment, the milling advance and retreat allowance portion includes a rounded corner milling advance and retreat allowance portion 21, a groove milling advance and retreat allowance portion 22, and a joint milling advance and retreat allowance portion 23. The purpose of the milling advance and retreat allowance portion is to provide a working space for the milling cutter. Among them, a rounded corner milling advance and retreat allowance portion 21 is correspondingly provided at the rounded corner, a groove milling advance and retreat allowance portion 22 is correspondingly provided at the groove, and a joint milling advance and retreat allowance portion 23 is provided at the rounded corner joint.

[0038] In this embodiment, the end of the rounded corner milling advance and retreat allowance portion 21 is semi-circular. The rounded corner milling advance and retreat allowance portion 21 is arranged on the attached edge 2 and is respectively located at the four top corners of the combined unit plate. When using a milling cutter to mill the joint between the attached edge 2 and the rounded corner 3 (at this time, the rounded corner 3 is the four top corners of the combined unit plate 1), the semi-circular milling advance and retreat allowance portion provides a larger working space on the basis of the original working space for the milling cutter. In this way, not only can the small sharp corners or burrs at the joint position of the attached edge 2 and the rounded corner 3 be processed cleanly, but the rounded corner milling advance and retreat allowance portion 21 provides a working allowance for the milling cutter, avoiding the milling cutter contacting the unit plate 1 during the milling process and causing damage to the unit plate 1.

[0039] In this embodiment, the retreat depth 5 of the groove milling advance and retreat allowance portion 22 is 0.3 mm. When the groove shape is rectangular, the depth of the groove 4 is 3 mm at this time. Similarly, the groove milling advance and retreat allowance portion 22 provides a working allowance for the milling cutter, facilitating the removal of small sharp corners and burrs at the joint of the attached edge 2 and the side of the unit plate 1. At the same time, the milling cutter has sufficient working space during the milling process, avoiding damage to the side of the unit plate 1.

[0040] In some embodiments, when the groove shape is not rectangular, according to the shape and size of the groove, the width of the groove milling advance and retreat allowance portion can be greater than, equal to, or less than the width of the groove.

[0041] In this embodiment, the joint milling advance and retreat allowance portion 23 is a semi-closed mechanism. The joint milling advance and retreat allowance portion 23 and the two rounded corners of the rounded corner joint portion 31 of the two unit plates 1 together form a closed mechanism. The distance between the two ends of the open side of the semi-closed mechanism is greater than the distance between the tangent points of the rounded corner 3 and the attached edge 2. Since the top corner of a single unit plate 1 is a rounded corner 3, a triangular area is formed between the joint of the two unit plates 1 and the attached edge 2. And in this triangular area, a narrow dead corner is formed at the tangent position of the unit plate 1 and the attached edge 2, which is not convenient for milling. The joint milling advance and retreat allowance portion 23 opens a notch on the attached edge 2 to include this dead corner within the notch. The purpose is to expose this dead corner within the joint milling advance and retreat allowance portion 23 so that the milling cutter can mill off the sharp corners and burrs at this dead corner. Similarly, this joint milling advance and retreat allowance portion 23 provides a working allowance for the milling cutter, and the milling cutter will not contact the unit plate 1 during the milling process, avoiding damage to the unit plate 1.

[0042] Both ends of the semi - enclosed mechanism can be arc - shaped, forming a semi - enclosed structure. The distance between the two ends of the open side of the semi - enclosed mechanism is greater than the distance between the tangent points of the two rounded corners 3 and the attached edge 2. The purpose is to completely include the dead corners within the combined milling advance - retreat allowance part 23, facilitating the milling process of the small sharp corners and burrs at the joint by the milling cutter.

[0043] Embodiment 2

[0044] Please refer to Figure 3 、 Figure 4 and Figure 6 simultaneously. Embodiment 2 provides a circuit board with an attached edge. The circuit board with the attached edge 2 includes:

[0045] A single - piece unit board 1, the top corners of the unit board 1 are rounded corners 3, and grooves 4 are provided on the side edges of the unit board 1; attached edges 2 are provided on both sides of the unit board 1, and the attached edges 2 are detachably connected to the two side edges of the unit board. Milling advance - retreat allowance parts are provided at the corresponding positions of the rounded corners 3 and the grooves 4. In the embodiment, the milling advance - retreat allowance parts are respectively the rounded - corner milling advance - retreat allowance part 21 and the groove milling advance - retreat allowance part 22. Among them, the rounded - corner milling advance - retreat allowance part 21 is provided at the corresponding position of the rounded corner, and the groove milling advance - retreat allowance part 22 is provided at the corresponding position of the groove. A combined milling advance - retreat allowance part 23 is provided at the rounded - corner joint.

[0046] In this embodiment, the end of the rounded - corner milling advance - retreat allowance part 21 is trapezoidal. The rounded - corner milling advance - retreat allowance part 21 is provided on the attached edge 2 and is located at the four top corners of the unit board 1 respectively. When using a milling cutter to mill the joint between the attached edge 2 and the rounded corner 3 (at this time, the rounded corner 3 combines the four top corners of the unit board 1), the trapezoidal milling advance - retreat allowance part provides a larger working space for the milling cutter on the basis of the original working space. It can not only clean the small sharp corners or burrs at the joint position of the attached edge 2 and the rounded corner 3, but also the rounded - corner milling advance - retreat allowance part 21 provides a working allowance for the milling cutter, avoiding the milling cutter contacting the unit board 1 during the milling process and causing damage to the unit board 1.

[0047] In this embodiment, the retreat depth 5 of the groove milling advance - retreat allowance part 22 is 0.6 mm. When the groove shape is rectangular, the depth of the groove 4 is 6 mm at this time. Similarly, the groove milling advance - retreat allowance part 22 provides a working allowance for the milling cutter, facilitating the removal of the small sharp corners and burrs at the joint between the attached edge 2 and the side edge of the unit board 1. At the same time, the milling cutter has sufficient working space during the milling process, avoiding damage to the side edge of the unit board 1.

[0048] Embodiment 3

[0049] Please refer to Figure 4 、 Figure 5 and Figure 8 simultaneously. Embodiment 3 provides a circuit board with an attached edge. The circuit board with the attached edge 2 includes:

[0050] There are two unit plates 1. The top corners of the unit plate 1 are rounded corners 3, and at least one groove 4 is provided on the side of the unit plate 1; the two unit plates 1 are fixedly connected, and an attached edge 2 is provided on one side of the unit plate group after combination, and the attached edge 2 is also fixedly connected to the side of the unit plate group.

[0051] Milling advance and retreat allowance parts are provided at the corresponding positions of the rounded corner 3, the groove 4 and the joint of the two unit plates 1.

[0052] In this embodiment, the milling advance and retreat allowance parts include a rounded corner milling advance and retreat allowance part 21, a groove milling advance and retreat allowance part 22 and a joint milling advance and retreat allowance part 23.

[0053] The rounded corner milling advance and retreat allowance part 21 is trapezoidal. The rounded corner milling advance and retreat allowance part 21 is arranged on the attached edge 2 and is located at the four top corners of the combined unit plate 1 respectively. When using a milling cutter to mill the joint of the attached edge 2 and the rounded corner 3 (at this time, the rounded corner 3 is the four top corners of the combined unit plate 1), the semi-circular milling advance and retreat allowance part provides a larger working space for the milling cutter on the basis of the original working space. It can not only clean up the small sharp corners or burrs at the joint of the attached edge 2 and the rounded corner 3, but also the rounded corner milling advance and retreat allowance part 21 provides a working allowance for the milling cutter, avoiding the milling cutter contacting the unit plate 1 during the milling process and causing the unit plate 1 to be incomplete.

[0054] In this embodiment, the retreat depth 5 of the groove milling advance and retreat allowance part 22 is 1.2 mm. When the groove shape is rectangular, the depth of the groove 4 at this time is 12 mm. Similarly, the groove milling advance and retreat allowance part 22 provides a working allowance for the milling cutter, facilitating the removal of small sharp corners and burrs at the joint of the attached edge 2 and the side of the unit plate 1. At the same time, the milling cutter has enough working space during the milling process, avoiding the defect of the side of the unit plate 1.

[0055] In this embodiment, the joint milling advance and retreat allowance part 23 is a semi-closed mechanism. The joint milling advance and retreat allowance part 23 and the two rounded corners of the rounded corner joint part 31 of the two unit plates 1 together form a closed mechanism. The distance between the two ends of the open side of the semi-closed mechanism is greater than the distance between the tangent points of the rounded corner 3 and the attached edge 2. Since the top corners of a single unit plate 1 are rounded corners 3, a triangular area is formed between the joint of the two unit plates 1 and the attached edge 2. And in this triangular area, a narrow dead corner is formed at the tangent of the unit plate 1 and the attached edge 2, which is not convenient for milling. The joint milling advance and retreat allowance part 23 opens a notch on the attached edge 2 to include this dead corner in the notch, aiming to expose this dead corner in the joint milling advance and retreat allowance part 23 so that the milling cutter can mill the sharp corners and burrs at this dead corner. Similarly, this joint milling advance and retreat allowance part 23 provides a working allowance for the milling cutter, and the milling cutter will not contact the unit plate 1 during the milling process, avoiding the defect of the unit plate 1.

[0056] Both ends of the semi-closed mechanism can be arc-shaped, forming a semi-closed structure. The distance between the two ends of the open side of the semi-closed mechanism is greater than the distance between the tangent points of the two rounded corners 3 and the attached edge 2. The purpose is to completely include the dead angle within the combined milling advance and retreat allowance part 23, facilitating the milling process of the small sharp corners and burrs at this joint by the milling cutter.

[0057] Embodiment 4

[0058] Please refer to Figure 3 、 Figure 4 and Figure 9 together. Embodiment 4 provides a circuit board with an attached edge 2, which includes:

[0059] A single unit board 1, the top corners of the unit board 1 are rounded corners 3, and at least one groove 4 is provided on the side of the unit board 1; attached edges 2 are provided on both sides of the unit board 1, and the attached edges 2 are fixedly connected to the side of the unit board group. Milling advance and retreat allowance parts are provided at the corresponding positions of the rounded corners 3 and the grooves 4, namely the rounded corner milling advance and retreat allowance part 21 and the groove milling advance and retreat allowance part 22.

[0060] In this embodiment, the end of the rounded corner milling advance and retreat allowance part 21 is trapezoidal. The rounded corner milling advance and retreat allowance part 21 is provided on the attached edge 2 and is located at the four top corners of the combined unit board 1 respectively. When using a milling cutter to mill the joint between the attached edge 2 and the rounded corner 3 (at this time, the rounded corner 3 is the four top corners of the combined unit board 1), the semi-circular milling advance and retreat allowance part provides a larger working space for the milling cutter on the basis of the original working space. It can not only clean the small sharp corners or burrs at the joint between the attached edge 2 and the rounded corner 3, but also the rounded corner milling advance and retreat allowance part 21 provides a working allowance for the milling cutter to avoid the milling cutter contacting the unit board 1 during the milling process and causing damage to the unit board 1.

[0061] In this embodiment, the width of the groove milling advance and retreat allowance part 22 is greater than or equal to the width of the groove 4, and the width is 0.9 mm. Similarly, the groove milling advance and retreat allowance part 22 provides a working allowance for the milling cutter, facilitating the removal of the small sharp corners and burrs at the joint between the attached edge 2 and the side of the unit board 1. At the same time, the milling cutter has sufficient working space during the milling process, avoiding the incompleteness of the side of the unit board 1.

[0062] Embodiment 5

[0063] Embodiment 5 provides a method for milling a circuit board with an attached edge 2, including: milling the rounded corners 3, the grooves 4, and the joint of the rounded corners 3.

[0064] In this embodiment, the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3 is as follows: The milling cutter is respectively inserted into the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3, so as to realize the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3. Through the working allowances provided by the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3 respectively, the milling process between the top rounded corner 3 and the attached edge 2, the groove 4 and the attached edge 2, and the joint of the rounded corner 3 and the attached edge 2 can be realized. Not only can the small sharp corners at these positions be removed completely, but also the integrity of the outer shape of the unit board 1 can be ensured.

[0065] Furthermore, the diameter of the milling cutter is 0.6 mm. At this time, the retracting depth 5 of the retracting and advancing part 22 for milling the groove is 0.3 mm, the width of the retracting and advancing part 22 for milling the groove is equal to the width of the groove 4, and the retracting and advancing part 21 for milling the rounded corner is semi-circular.

[0066] Embodiment 6

[0067] Embodiment 6 provides a method for milling a circuit board with an attached edge 2, including: the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3.

[0068] In this embodiment, the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3 is as follows: The milling cutter is respectively inserted into the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3, so as to realize the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3. Through the working allowances provided by the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3 respectively, the milling process between the top rounded corner 3 and the attached edge 2, the groove 4 and the attached edge 2, and the joint of the rounded corner 3 and the attached edge 2 can be realized. Not only can the small sharp corners at these positions be removed completely, but also the integrity of the outer shape of the unit board 1 can be ensured.

[0069] Furthermore, the diameter of the milling cutter is 1.2 mm. At this time, the retracting depth of the retracting and advancing part 22 for milling the groove is 0.6 mm, the width of the retracting and advancing part 22 for milling the groove is greater than the width of the groove 4, and the retracting and advancing part 21 for milling the rounded corner is trapezoidal.

[0070] Embodiment 7

[0071] Embodiment 7 provides a method for milling a circuit board with an attached edge 2, including: the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3.

[0072] In this embodiment, the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3 is as follows: The milling cutter is respectively inserted into the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3, so as to realize the milling process for the rounded corner 3, the groove 4, and the joint of the rounded corner 3. By means of the working allowances provided by the retracting and advancing part 21 for milling the rounded corner, the retracting and advancing part 22 for milling the groove, and the retracting and advancing part 23 for milling the joint of the rounded corner 3 respectively, the milling process for the top rounded corner 3 and the attached edge 2, the groove 4 and the attached edge 2, and the joint of the rounded corner 3 and the attached edge 2 can be realized. Not only can the small sharp corners at these positions be removed completely, but also the integrity of the unit board 1 can be ensured.

[0073] Further, the diameter of the milling cutter is 2.4 mm. At this time, the retracting depth of the retracting and advancing part 22 for milling the groove is 1.2 mm. The width of the retracting and advancing part 22 for milling the groove is greater than the width of the groove 4, and the retracting and advancing part 21 for milling the rounded corner is semi-circular.

[0074] In the above embodiment, the diameter of the milling cutter can be selected according to the size of the groove, so as to be able to insert into the retracting and advancing part for milling.

[0075] It should be understood that in the foregoing embodiment, for the shape of the retracting and advancing part 21 for milling the rounded corner, it is not limited to the arc shape and trapezoidal shape listed in the foregoing embodiment. Any shape with an included angle greater than 180° at the entry angle can be used to form the retracting and advancing part 21 for milling the rounded corner.

[0076] By designing a retracting part on the process attached edge, when milling the junction of the unit board and the attached edge, the present invention can realize the complete milling process for this junction position, solve the problem of small sharp corners or burrs. At the same time, during the milling process, the retracting part provides a working allowance for the milling cutter, which not only realizes the milling process for the junction, but also avoids the milling cutter from contacting the unit board, ensuring the integrity of the unit board.

[0077] The above is a specific description of the preferred embodiment of the present invention. However, the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A circuit board with an attached edge, characterized in that, Comprising: At least one unit board, the top corners of the unit board are rounded, and grooves are provided on the side edges of the unit board; An attached edge is further connected to the side edge; The attached edge is detachably connected to the side edge, and milling advance and retreat allowance parts are provided at positions corresponding to the rounded corners and the grooves. The milling advance and retreat allowance parts provide a working space for the milling cutter. A rounded corner milling advance and retreat allowance part is correspondingly provided at the rounded corner, and a groove milling advance and retreat allowance part is correspondingly provided at the groove; There are two opposite side edges of the unit board where no grooves are provided, and no attached edge is connected to the side edges where no grooves are provided; A combined milling advance and retreat allowance part is provided at the rounded corner joint part between at least two of the unit boards; For two adjacent unit boards, the side of the unit board where no attached edge is connected is directly connected to the side of the other unit board where no attached edge is connected; The combined milling advance and retreat allowance part is a semi-closed mechanism. The combined milling advance and retreat allowance part and the two rounded corners of the rounded corner joint part together form a closed mechanism. The distance between the two ends of the open side of the semi-closed mechanism is greater than the distance between the tangent points of the rounded corner and the attached edge. The two ends of the semi-closed mechanism are arc-shaped.

2. The circuit board with an attached edge according to claim 1, characterized in that, The retreat depth of the groove milling advance and retreat allowance part is 0.3 mm - 1.2 mm.

3. The circuit board with an attached edge according to any one of claims 1 to 2, characterized in that The depth of the groove is 0.3 mm - 1.2 mm.

4. A milling process method for a circuit board, characterized in that, Applied to the circuit board with attached edges described in claims 1 to 3, the method includes: milling treatment of the rounded corners, the grooves and the rounded corner joint part; the milling treatment of the rounded corners, the grooves and the rounded corner joint part is: inserting the milling cutter into the rounded corner milling advance and retreat allowance part, the groove milling advance and retreat allowance part and the combined milling advance and retreat allowance part respectively to realize the milling treatment of the rounded corners, the grooves and the rounded corner joint part.

5. The milling process method of the circuit board according to claim 4, characterized in that, Comprising: The diameter of the milling cutter is 0.6 mm - 2.4 mm.

6. The milling processing method of the circuit board according to any one of claims 4 to 5, characterized in that The retreat depth of the groove milling advance and retreat allowance part is 0.3 mm - 1.2 mm.

7. The milling processing method of the circuit board according to any one of claims 4 to 5, characterized in that, The depth of the groove is 0.3 mm - 1.2 mm.

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