Processing method of circuit board and circuit board with contour tolerance of +/-0.05mm

Abstract

The invention discloses a processing method of a circuit board and a circuit board with a contour tolerance of + / -0.05mm. The processing method comprises the following steps: 1) fixing a special carte on a milling machine table top; 2) aligning and overlaying an epoxy resin board and a cover board on the special carte; 3) drilling a special carte dowel hole on the special carte, an epoxy resin board dowel hole on the epoxy resin board and the first row of dowel hole of the cover board; 4) processing the circulation milling path of the cover board and the epoxy resin board, which corresponds to the circuit board; 5) drilling the second row of dowel hole of the cover board; 6) putting a circuit board dowel on the epoxy resin board dowel hole on the epoxy resin board; 7) processing a millingcutter according to the first circulation milling flute and the second circulation milling flute of the cover board; and 8) processing the other rows of the circuit board according to the technology of step 7 to form the circuit board with contour tolerance of + / -0.05mm. The method is characterized in that precision can not be affected by external factors, the circuit board can be reused, and thecontinuity and the consistency of contour dimensional accuracy can be guaranteed.

Description

technical field [0001] The invention relates to a processing method of a circuit board and a circuit board with an appearance tolerance of ±0.05mm. Background technique [0002] In a sense, the history of electronics in recent decades can be seen as a history of gradual miniaturization. The main driving force for the transition to miniaturization of electronic products is the miniaturization of components and integrated circuits, and for packaging carriers- The requirements for processing dimensional tolerances of printed circuit boards are also increasing day by day. For example, the mobile phone board order of Dachang Electronics Co., Ltd. in Japan, etc., the tolerance requirement of the outer dimension of the finished board has reached ±0.05mm, which is a severe challenge for the printed board manufacturer. The reasons are as follows: [0003] At present, the commonly used circuit board CNC milling machine processing mode is: bakelite board + paper backing board + circui...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the current popular milling method, in the process of processing circuit boards, due to the continuous movement of the milling cutter, the reverse action of the transverse shear force at the corner of the milling path and the reaction of the resistance of the paper backing plate and cover plate, the milling cutter Axial offset is very easy to occur, which directly affects the accuracy of the outer dimension of the circuit board

[0005] The problems existing in the use of conventional processing methods on CNC drilling machines have been unable to meet the tolerance of the processed circuit boards within ±0.05mm

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