Double-sided composite aluminum sheet

Abstract

The invention discloses a double-sided composite aluminum sheet which comprises an aluminum sheet body, an anti-burr resin coating and a precise alignment resin layer, wherein the anti-burr resin coating and the precise alignment resin layer are arranged on the two side surfaces of the aluminum sheet body respectively. The thickness of the anti-burr resin coating ranges from 10 micrometers to 60 micrometers, and the hardness of the anti-burr resin coating ranges from 4 H to 9 H. The coating thickness of the precise alignment resin layer is 40 micrometers to 140 micrometers, and the hardness is 2B to H. The circuit board is covered with the surface coated with the anti-burr resin coating, the precise alignment resin layer faces a drill point, the drill point makes contact with the precise alignment layer firstly during drilling, the precise alignment layer is made of epoxy resin materials, the hardness of the precise alignment layer is 2B to H, the precise alignment layer can stick and fix the position of a drill point head, the positioning effect is achieved when the drill point drills downwards, and therefore, the hole location positioning precision of the drilled hole of the processed circuit board is improved.

Description

technical field [0001] The invention relates to the technical field of circuit board processing, in particular to a double-sided composite aluminum sheet. Background technique [0002] Since most circuit boards have mounting holes for installation and through holes for conduction, the circuit board needs to be drilled. In order to improve the accuracy of drilling, a layer of aluminum sheet will be covered on the surface of the circuit board to facilitate the precise positioning of the drill pin. Although covering the surface of the circuit board with a layer can effectively improve the positioning of the drill, there will also be new problems. When the drill drills through the aluminum sheet, the holes drilled by the drill on the aluminum sheet are prone to edging. It is very easy to scratch the circuit board and affect the appearance of the circuit board; in severe cases, the front will scratch the green oil insulation layer on the surface of the circuit board and affect t...

AI Technical Summary

Problems solved by technology

Although covering the surface of the circuit board with a layer can effectively improve the positioning of the drill, there will also be new problems. When the drill drills through the aluminum sheet, the holes drilled by the drill on the aluminum sheet are prone to edging. It is very easy to scratch the circuit board and affect the appearance of the circuit board; in severe cases, the front will scratch the green oil insulation layer on the surface of the circuit board and affect the insulation performance of the circuit board

Moreover, there is a large gap between the hardness of the circuit board and the hardness of the aluminum sheet. After the drill needle drills through the aluminum sheet, the drill needle will directly drill holes on the circuit board layer. However, the direct impact of the drill needle on the hard circuit board will easily cause the edge of the hole to Gap and edge appear, seriously affecting the quality of the hole

Although the aluminum sheet can improve the drilling accuracy very well, but because the hole diameter drilled by the circuit board is extremely small, the diameter of the drill bit is also small, and the contact between the drill bit and the aluminum sheet is hard-to-hard contact, so the high-speed rotating drill bit The needle is prone to breakage when it touches the aluminum sheet. Once the needle breaks, you must stop the machine to replace the drill needle, which seriously affects the production efficiency.

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