A method for forming a circuit board

Abstract

The application discloses a circuit board forming milling method, which comprises the following steps: milling inner grooves: when the inner grooves are square groove holes or ring groove holes, and when the groove width is less than or equal to 2.0 mm, a drill needle with a width of 0.2 mm less than the groove width is selected to drill a lower knife position guide hole, and the lower knife position guide hole is arranged at the center of the two top ends of the groove; when the groove width is greater than 2.0 mm, a 1.8 mm drill needle is selected to drill a lower knife position guide hole, and the lower knife position guide hole is arranged at the groove end and close to one side edge, and the distance between the lower knife position guide hole and the forming line is 0.2 mm; the lower knife and the knife receiving point of the inner groove are arranged at the guide hole; milling outer frames: when a right angle is milled, the lower knife point is extended outward by 1.0 mm, and the receiving point is extended outward by 1.0 mm; when an oblique angle is milled, the lower knife point is extended outward by 1.0 mm, and the knife receiving point is extended outward by 0.5 mm; when an R angle is milled, the lower knife point is extended outward by 1.0 mm, and the knife receiving point is overlapped with the inner straight line part of the board by 1.0 mm after the arc. The circuit board forming milling method provided by the application can improve the size precision of the forming milling, prolong the milling distance of the milling cutter and save the milling cutter cost.

Description

Technical Field

[0001] This invention relates to the field of circuit board manufacturing technology, and specifically to a method for forming circuit board roll plates. Background Technology

[0002] With the development of electronic technology products, the demand for printed circuit boards has been increasing, which has led to the rapid development of printed circuit board companies and increasingly higher requirements for the manufacturing precision of circuit boards.

[0003] Routing is a crucial step in PCB manufacturing and a common forming method in modern PCB production. However, in traditional PCB routing processes, improper cutting techniques such as the initial cut, the final cut, and the design of the pilot holes can easily lead to dimensional deviations and bumps in the formed PCB, affecting the lifespan of the routing cutter and increasing costs.

[0004] Therefore, it is necessary to provide a new method for forming sprues to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for forming a circuit board router plate, which can improve the dimensional accuracy of the formed router plate, increase the router stroke, and save the cost of the router.

[0006] The technical solution of the present invention is as follows:

[0007] A method for forming a circuit board router includes:

[0008] Router inner groove: When the inner groove is a square or annular groove, and the groove width is ≤2.0mm, select a drill bit 0.2mm smaller than the groove width and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is placed at the center of the two top ends of the groove. When the groove width is >2.0mm, select a drill bit 1.8mm and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is located at the end of the groove, close to one side, and 0.2mm away from the forming line. When the inner groove is a circular hole with a diameter >6.0mm, select a drill bit 1.8mm and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is 0.2mm away from the forming line. The starting and ending points of the cutting tool in the inner groove are both at the guide hole.

[0009] For the outer frame of the router: When routering a right angle, extend the starting point outward by 1.0mm and the ending point outward by 1.0mm; when routering an angled corner, extend the starting point outward by 1.0mm and the ending point outward by 0.5mm; when routering a radius corner, extend the starting point outward by 1.0mm and the ending point is located at the point where the straight part of the arc overlaps with the inner part of the board by 1.0mm.

[0010] If the inner groove length is greater than 30mm, and the ratio of the width from the groove edge to the outer edge to the plate thickness is less than 2, then the outer frame should be machined first, followed by the inner groove; otherwise, the inner groove should be machined first, followed by the outer frame.

[0011] Furthermore, a reverse gong is used for the outer frame of the gong, while a forward gong is used for the inner groove of the gong.

[0012] Furthermore, the outer frame and inner groove of the gong are made by separate cutting, and the gong cutters are selected in the order of 1.8mm, 1.6mm, 1.5mm and 1.3mm according to the spacing between the panels, and the spacing between the panels is greater than the selected cutter diameter by more than 0.1mm.

[0013] Furthermore, the inner radius is created by drilling a pilot hole with an added radius, and the diameter of the drill bit is twice that of the inner radius. That is, the diameter of the pilot hole with the radius is twice that of the inner radius. For example, if the radius is required to be 0.3mm, the size of the pilot hole is set to 0.6mm.

[0014] Furthermore, the inner radius of the corner is 0.3mm, 0.4mm, 0.5mm or 0.6mm, and the corresponding drill bit diameter is 0.6mm, 0.8mm, 1.0mm or 1.2mm.

[0015] Furthermore, in the process of creating the outer frame, when there is a groove on the outer frame, it is created using a profile milling cutter, and the milling cutter is selected according to the radius (R) of the groove.

[0016] Furthermore, when the diameter of the external milling cutter is less than 1.5mm, the groove is milled first, and then the external shape is milled.

[0017] Furthermore, in the process of creating the outer frame of the gong, the outer arc, which is smaller than the diameter of the gong cutter, is directly gonged out, while the inner arc is drilled with corresponding pilot holes based on the radius (R) of the arc.

[0018] Compared with the prior art, the circuit board forming and routing method provided by the present invention has the following advantages:

[0019] The circuit board forming router method provided by this invention adds a pilot hole when routering the inner groove, and the router cutter enters from the pilot hole, which can reduce the problem of tool breakage and edge board damage caused by chip removal; the entry and exit points of the cutter when routering the outer frame are extended, which can improve the problem of dimensional deviation and protrusion caused by the force of the router cutter during the travel; and by optimizing the selection of the router cutter, the router board efficiency is improved and the router cutter stroke is increased, thereby saving the cost of the router cutter. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of one embodiment of the inner groove of the gong in this invention;

[0022] Figure 2This is a schematic diagram of another method of the inner groove of the gong in this invention;

[0023] Figure 3 This is a schematic diagram of the circular hole in the present invention. Detailed Implementation

[0024] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, and to make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be further described below.

[0025] It should be noted that the descriptions of these embodiments are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] A method for forming a circuit board router includes an inner router groove and an outer router frame. The specific method includes:

[0027] (1) Gong inner groove:

[0028] When the inner groove is a square or annular groove, and the groove width is ≤2.0mm, select a drill bit 0.2mm smaller than the groove width and drill a guide hole for the tool position. Place the guide hole at the center of both top ends of the groove. Figure 1 As shown;

[0029] When the groove width is greater than 2.0mm, use a 1.8mm drill bit to drill a guide hole for the cutting tool position. The guide hole should be placed at the end of the groove, close to one side, and 0.2mm away from the forming line. Figure 2 As shown;

[0030] When the inner groove is a circular hole with a diameter > 6.0 mm, use a 1.8 mm drill bit to drill a guide hole for the lower tool position, with the guide hole 0.2 mm away from the forming line; if Figure 3 As shown;

[0031] Furthermore, the starting and ending points of the cutter in the inner groove of the gong are both located at the pilot hole.

[0032] (2) Gong outer frame:

[0033] When routerging a right angle, extend the starting point outward by 1.0mm and the ending point outward by 1.0mm; when routerging a beveled angle, extend the starting point outward by 1.0mm and the ending point outward by 0.5mm; when routerging a radius angle, extend the starting point outward by 1.0mm and the ending point is located at the point where the straight section from the arc to the inside of the board overlaps by 1.0mm.

[0034] During the milling process, if the inner groove length is greater than 30mm and the ratio of the width from the groove edge to the outer edge to the plate thickness is less than 2, then the outer frame is milled first, followed by the inner groove; otherwise, the inner groove is milled first, followed by the outer frame. Preferably, reverse milling is used when milling the outer frame, and forward milling is used when milling the inner groove.

[0035] During the routing process, the outer frame and inner groove of the router are fabricated separately. Routers are selected based on the panel spacing, with diameters of 1.8mm, 1.6mm, 1.5mm, and 1.3mm in that order, ensuring the panel spacing is at least 0.1mm greater than the selected diameter. It should be noted that this method of selecting the router diameter applies to both the outer frame and the inner groove. Preferably, a diameter of 1.5mm or larger is used for both the outer frame and the inner groove to increase the number of boards stacked and save costs. For single-piece PCB shaping, a 1.8mm diameter router is preferred, followed by a 1.6mm diameter router.

[0036] The inner radius (R-angle) is created by drilling pilot holes during the milling process, instead of using a knife to trim the corners as in existing technology. This improves the efficiency of milling. The drill bit diameter is twice the inner radius, meaning the diameter of the pilot hole is twice the radius of the inner radius. For example, if the required radius is 0.3mm, the pilot hole size is set to 0.6mm. Specifically, the inner radius is 0.3mm, 0.4mm, 0.5mm, or 0.6mm, and correspondingly, the drill bit diameter is 0.6mm, 0.8mm, 1.0mm, or 1.2mm.

[0037] When making the chamfers and rounded corners of the gong's outer frame, in order to improve the phenomenon of the right angle of the board edge scratching the green paint surface, the rounded corners are made with 1.2mm for those with process edges and 0.5mm for those without process edges.

[0038] Preferably, in the process of milling the outer frame, when there is a groove on the outer frame, a profile milling cutter is used to mill it out, and the milling cutter is selected according to the radius of the groove. If the profile milling cutter is less than 1.5mm, the groove is milled separately first and then the profile is milled. When milling the plate, it is impossible to mill a small radius angle with a large milling cutter, so a hole of the same size is pre-drilled here. The outer arc with a diameter smaller than that of the profile milling cutter is directly milled out, and the inner arc is milled with corresponding pilot holes according to the radius of the arc.

[0039] The circuit board forming and routing method provided by this invention solves problems such as dimensional deviations and protrusions in the routing process by optimizing the cutting point and the cutting end point of the inner groove and outer frame of the router; and improves routing efficiency and increases the router's stroke by optimizing the selection of router cutters, thereby saving router cost.

[0040] The embodiments of the present invention have been described in detail above, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A method for forming a circuit board router, characterized in that, include: Router inner groove: When the inner groove is a square or annular groove, and the groove width is ≤2.0mm, select a drill bit 0.2mm smaller than the groove width and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is placed at the center of the two top ends of the groove. When the groove width is >2.0mm, select a 1.8mm drill bit and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is located at the end of the groove, close to one side, and 0.2mm away from the forming line. When the inner groove is a circular hole with a diameter >6.0mm, select a 1.8mm drill bit and drill a guide hole for the cutting tool position. The guide hole for the cutting tool position is 0.2mm away from the forming line. The starting and ending points of the cutting tool in the inner groove are both at the guide hole. For the outer frame of the router: When routering a right angle, extend the starting point outward by 1.0mm and the ending point outward by 1.0mm; when routering an angled corner, extend the starting point outward by 1.0mm and the ending point outward by 0.5mm; when routering a radius corner, extend the starting point outward by 1.0mm and the ending point is located at the point where the straight part of the arc overlaps with the inner part of the board by 1.0mm. If the inner groove length is greater than 30mm, and the ratio of the width from the groove edge to the outer edge to the plate thickness is less than 2, then the outer frame should be machined first, followed by the inner groove; otherwise, the inner groove should be machined first, followed by the outer frame.

2. The circuit board forming and routing method according to claim 1, characterized in that, When making the outer frame of the gong, a reverse gong is used; when making the inner groove of the gong, a forward gong is used.

3. The circuit board forming and routing method according to claim 1, characterized in that, The outer frame and inner groove of the gong are made by separate cutting. The gong cutters are selected according to the spacing between the panels, with cutter diameters of 1.8mm, 1.6mm, 1.5mm and 1.3mm in sequence, and the spacing between the panels must be greater than the selected cutter diameter by more than 0.1mm.

4. The circuit board forming and routing method according to claim 1, characterized in that, The inner radius is created by drilling a pilot hole with an additional radius, and the diameter of the drill bit is twice that of the inner radius.

5. The circuit board forming and routing method according to claim 4, characterized in that, The inner radius of the corner is 0.3mm, 0.4mm, 0.5mm or 0.6mm, and the corresponding drill bit diameter is 0.6mm, 0.8mm, 1.0mm or 1.2mm.

6. The circuit board forming and routing method according to claim 1, characterized in that, In the process of creating the outer frame, when there is a groove on the outer frame, a profile milling cutter is used to create it, and the milling cutter is selected according to the radius (R) of the groove.

7. The circuit board forming and routing method according to claim 6, characterized in that, When the diameter of the milling cutter is less than 1.5mm, mill the groove first and then the outer shape.

8. The method for forming a circuit board according to claim 6, characterized in that, In the process of creating the outer frame of the gong, the outer arc, which is smaller than the diameter of the gong cutter, is directly gonged out, while the inner arc is gonged out with corresponding pilot holes based on the radius (R) of the arc.

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