Depth control milling structure for circuit board and depth control milling method

Abstract

The invention relates to a depth control milling structure for a circuit board and a corresponding depth control milling method. The depth control milling structure for the circuit board comprises a longitudinal depth control plane and a bottom plane, and the joint of the two planes is an inclined plane. The depth control milling method for the circuit board comprises the steps that firstly, a sharp-corner milling cutter with a proper angle is selected; secondly, the depth that a plate should be milled is calculated according to the thickness of the plate and a depth control milling residue thickness numerical value; thirdly, the height of the Z axis of a milling machine cabinet is set, and the depth of a gong plate is calculated; fourthly, the milling machine cabinet is controlled for cutting the depth control part of the needed inclined plane corresponding to the center point of the diameter of the sharp-corner milling cutter; and fifthly, a flattop milling cutter is used and moved so that the edge of the flattop milling cutter corresponds to a bottom corner of the inclined plane for cutting. Compared with the prior art, the two kinds of cutters are adopted, operation is conducted step by step, the depth control milling structure with the inclined plane is obtained, the stress between the depth control plane and the bottom plane can be greatly increased, and the problem that the circuit board is prone to being layered and cracked during use is solved.

Description

technical field [0001] The invention relates to the technical field of circuit board production. Background technique [0002] The PCB controlled depth milling process is often used in the design of single-sided plug boards and board edge slots, etc. Specifically, it refers to the control of the cutting depth of the CNC at the specified position when the PCB is made, and the L groove that meets the assembly requirements is milled out to make the PCB During the installation process, it can be fixed on the device through the plug-in card. Such as figure 1 As shown, in traditional PCB controlled depth milling, since the milling cutter face 3 of the milling cutter A is a plane, the depth-controlled face 1 and the bottom face 2 obtained after rotating on the circuit board B form a 90° right angle. It is inevitable that it will be affected by external force. If the external force reaches a certain strength, it will cause delamination between the depth control surface and the bot...

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in traditional PCB controlled depth milling, since the milling cutter face 3 of the milling cutter A is a plane, the depth-controlled face 1 and the bottom face 2 obtained after rotating on the circuit board B form a 90° right angle. It is inevitable that it will be affected by external force. If the external force reaches a certain strength, it will cause delamination between the depth control surface and the bottom surface, resulting in copper breakage in via holes, plug-in holes, etc., resulting in PCB open circuit

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