Machining method for 5-12 oz thick copper power circuit board drilling

Abstract

The invention belongs to a machining method for 5-12 oz thick copper power circuit board drilling. The machining method is characterized by comprising the following steps that firstly, when the drilling diameter is larger than 2.0 mm , a drill bit 3 with the diameter phi of 1.55 mm is selected, and a first pre-drill hole 4 with the diameter phi 1of 1.55 is drilled; secondly, after the first pre-drill hole 4 with the diameter phi 1 of 1.55 is drilled and when the difference between the designed drilling diameter and the diameter of 1.55 mm of the first pre-drill hole is larger than 0.45-0.6 mm, a drill bit with the diameter phi 2 of 1.55 mm plus 0.45-0.6 mm is selected to drill a second pre-drill hole; thirdly, equally, when the difference between the diameter of the second pre-drill hole and the designed hole diameter is larger than 0.45-0.6 mm, a drill bit with the diameter phi3 to which phi 2 plus 0.45-0.6 mm equals is selected to drill a third pre-drill hole; fourthly, the rest can be done in the same manner till the difference between the pre-drill hole diameter and the designed hole diameter is smaller than or equal to 0.45-0.6 mm, and a drill bit with the diameter equal to the designed hole diameter is selected to finish the final sequential machining. Copper scraps do not block a vacuum pipe, the machining precision is high, and cost is saved.

Description

technical field [0001] The invention belongs to a processing method of a circuit board, in particular to a method for drilling a 5-12oz thick copper power supply circuit board. Background technique [0002] With the rapid development of the automobile industry all over the world, the demand for thick copper power supply boards for automobiles has shown rapid growth, which requires manufacturers capable of producing thick copper power supply boards to try their best to find the highest efficiency and best quality processing methods. Thick copper power supply Because the copper foil on the surface of the board is too thick, the ordinary drilling process can no longer meet the needs of quality and production efficiency. The specific performance is: in terms of quality, the problems of copper shavings blocking holes, swollen mouths, and burrs are quite serious; in terms of efficiency: a single Hitachi HITACHI CNC drilling machine (6 axes / set) can produce 5-12oz thick copper pow...

AI Technical Summary

Problems solved by technology

Although this method can also solve the problem of plugging holes and vacuum systems caused by too long copper shavings, it has the following defects: First, after pre-drilling two holes, when re-drilling the holes with a drill bit with a diameter of D, the two holes After the solid part in the middle is drilled through, a groove will be formed in one direction, and the drill bit will be subjected to a small radial force in the direction of the groove, but will be subjected to a large radial force in the vertical direction, and the drill will be subjected to a small radial force The direction of the deviation will eventually affect the hole shape and hole position

Second, whether it is to pre-drill 2 holes or 4 holes, it is a non-center pre-drilled hole, so that when the hole is re-drilled with a drill with a diameter of D, the cutting edge will be on the solid plate and the air (pre-drilled) The continuous alternate drilling in the hole) will inevitably cause the spindle and the tool to be subjected to alternating stress during the drilling process, which will affect the service life of the spindle, the machining accuracy of the product, and the quality of the hole. This effect increases with the diameter of the tool. big and big

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