PCB for improving copper sheet pulling of depth-controlled milling PTH hole

Abstract

The utility model relates to the technical field of PCBs (Printed Circuit Board), in particular to a PCB for improving pulling of a copper sheet of a depth-controlled milled PTH (Plated Through Hole), which comprises a board body, at least one surface of the board body is provided with a non-milling groove area and a depth-controlled milling groove area, the surface is also provided with a PTH positioned in the depth-controlled milling groove area, the depth-controlled milling groove area is also provided with a first milling area, and the first milling area is provided with a second milling area. The first milling area is a cylinder area rotationally milled when the milling cutter descends by a preset depth, the cross section of the cylinder area covers the cross section of the PTH hole, and the preset depth is the depth of the depth-controlled groove milling area. According to the utility model, the pre-milling area is arranged at the position of the PTH hole, so that the pre-milling area with the PTH hole can be milled firstly when the depth-controlled milling process is carried out, the copper sheet in the hole is prevented from being pulled by the edge when the milling cutter rotates, the phenomenon that the copper sheet is pulled by the edge of the PTH hole in the depth-controlled milling groove is avoided, and the production quality and the qualified rate of a PCB (Printed Circuit Board) are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of PCB, especially to a PCB for improving copper skin pulling of PTH hole of depth control milling. BACKGROUND

[0002] Due to the development of high integration and miniaturization of electronic products, the printed circuit board as the carrier of electronic products is more and more developed in the direction of thinness and high multilayer, which is applied to various fields and has various types and different design requirements. For example, the PCB used in the base station in outdoor environment has the characteristics of harsh environment, limited space, high requirements of shock resistance and corrosion resistance, and large temperature difference. When designing the PCB, the above factors should be considered, and the depth control milling PCB can effectively solve the above requirements.

[0003] In the actual production process of depth control milling, the copper skin of the edge of the PTH hole in the depth control milling groove is pulled, which is easy to cause burr and is time-consuming and laborious to repair, and the PCB is also easy to be scrapped. Based on this, the application provides a PCB for improving copper skin pulling of PTH hole of depth control milling. UTILITY MODEL CONTENT

[0004] In order to solve the above technical problems, the utility model provides a PCB for improving copper skin pulling of PTH hole of depth control milling, which is convenient for milling the first milling area with the PTH hole during the depth control milling process, avoiding the edge pulling of the copper skin in the hole when the milling cutter rotates, and eliminating the phenomenon of copper skin pulling of the edge of the PTH hole in the depth control milling groove.

[0005] The PCB for improving copper skin pulling of PTH hole of depth control milling in the scheme comprises a plate body, a non-milling groove area and a depth control milling groove area on at least one surface of the plate body, and a PTH hole located in the depth control milling groove area is also provided on the surface, wherein the depth control milling groove area is further provided with a first milling area, the first milling area is a cylindrical region rotated by the descent of the milling cutter by a preset depth, the cross section of the cylindrical region covers the cross section of the PTH hole, and the preset depth is the depth of the depth control milling groove area.

[0006] The utility model further limits the technical scheme:

[0007] Further, the cross section of the cylindrical region is concentrically arranged with the cross section of the PTH hole.

[0008] Further, the cross section diameter of the cylindrical region is greater than the cross section diameter of the PTH hole.

[0009] Further, the cross section diameter of the PTH hole is 1.4mm-1.9mm, and the cross section diameter of the cylindrical region is 2mm.

[0010] Further, the depth of the PTH hole is greater than the depth of the depth control milling groove area.

[0011] Further, the depth of the PTH hole is greater than the depth of the depth control milling groove area.

[0012] The PCB provided by the utility model improves the copper skin pulling of the PTH hole in the depth control milling, avoids the edge of the PTH hole in the depth control milling groove from being pulled by the copper skin when the milling cutter rotates, and prevents the phenomenon of copper skin pulling from occurring, which is beneficial to improving the production quality and the pass rate of the PCB. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a plan view of the PCB in the specific embodiment of the utility model;

[0014] Figure 2 It is a sectional view of the PCB in the specific embodiment of the utility model;

[0015] Figure 3 It is the utility model Figure 2 A part enlarged view in the specific embodiment of the utility model;

[0016] Figure 4 It is a schematic view of the PCB in the depth control milling in the specific embodiment of the utility model;

[0017] Wherein: 10, plate body; 11, non-milling groove area; 12, depth control milling groove area; 13, PTH hole; 14, first milling area. DETAILED DESCRIPTION

[0018] As Figure 1 shown, the PCB provided by the utility model for improving the copper skin pulling of the PTH hole in the depth control milling, comprising a plate body 10, the upper surface of the plate body 10 has a non-milling groove area 11 and a depth control milling groove area 12 of cuboid structure, and the surface is also provided with a PTH hole 13 in the depth control milling groove area 12, the depth of the PTH hole 13 is greater than the depth of the depth control milling groove area 12, wherein the depth control milling groove area 12 is also provided with a first milling area 14, the first milling area 14 is the cylindrical region rotated by the preset depth of the milling cutter descending, the cross section of the cylindrical region covers the cross section of the PTH hole 13, and the preset depth is the depth of the depth control milling groove area 12.

[0019] In the embodiment, the cross section of the cylindrical region is concentrically arranged with the cross section of the PTH hole 13, and the cross section diameter of the cylindrical region is greater than the cross section diameter of the PTH hole 13, more specifically, the cross section diameter of the PTH hole 13 is generally 1.4mm-1.9mm, at this time, the cross section diameter of the cylindrical region is 2mm, but in order to facilitate the display of the first milling area 14 in each figure of the application, the diameter of the cylindrical region is appropriately enlarged to 3mm.

[0020] As shown in Figure 2 and Figure 3 , the depth control milling groove area 12 described in the application is specifically a clamping groove for positioning components and devices by depth control milling, the PTH hole 13 is specifically a hole with a metalized hole wall, the copper skin pulling phenomenon of depth control milling PTH hole is specifically that when the depth control milling groove area 12 is milled in the area with the PTH hole 13, if the milling cutter is lowered after the position, the top surface of the first milling area 14 does not completely cover the top surface of the PTH hole 13, and the edge of the milling cutter may pull out the copper skin of the PTH hole 13 when it rotates, resulting in burr phenomenon at the edge of the PTH hole 13, therefore, the application predefines the first milling area 14 around the PTH hole 13, mills the first milling area 14 (i.e. cuts down at the center above the PTH hole 13) to the required depth, and then performs tool walking in the direction shown in Figure 4 , and mills the depth control milling groove area 12 outside the first milling area 14, which can eliminate the copper skin pulling burr phenomenon.

[0021] In addition to the above embodiments, the utility model can also have other implementation manners; any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the utility model.

Claims

1. A PCB board for improving copper foil pull-out during controlled-depth milling of PTH holes, comprising a board body (10), characterized in that, The plate (10) has a non-milled groove area (11) and a controlled depth milled groove area (12) on at least one surface, and a PTH hole (13) located in the controlled depth milled groove area (12) is also provided on the surface. The controlled depth milled groove area (12) is also provided with a pre-milled area (14). The pre-milled area (14) is a cylindrical area milled by the milling cutter descending to a preset depth. The cross section of the cylindrical area covers the cross section of the PTH hole (13). The preset depth is the depth of the controlled depth milled groove area (12).

2. The PCB board according to claim 1, characterized in that, The cross-section of the cylindrical region is concentric with the cross-section of the PTH hole (13).

3. The PCB board according to claim 2, characterized in that, The cross-sectional diameter of the cylindrical region is greater than the cross-sectional diameter of the PTH hole (13).

4. The PCB board according to claim 3, characterized in that, The cross-sectional diameter of the PTH hole (13) is 1.4 mm to 1.9 mm, and the cross-sectional diameter of the cylindrical region is 2 mm.

5. The PCB board according to claim 1, characterized in that, The depth of the PTH hole (13) is greater than the depth of the controlled depth milling groove area (12).

6. The PCB board according to claim 1, characterized in that, The controlled depth milling groove area (12) has a cuboid structure.

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