Drilling method of a pcb board drilling machine

Abstract

The invention relates to a drilling processing method of a PCB (printed circuit board) board drilling machine, which comprises a downward stroke controlling a drill spindle of the drilling machine to rotate forwards, and an upward return stroke controlling the drill spindle of the drilling machine to rotate reversely, wherein the downward stroke comprises a downward noncutting stroke and a downward drilling stroke; the downward noncutting stroke comprises an acceleration section and a deceleration section, the deceleration section keeps until a touch pad rotation speed Vb is achieved when a drill cutter touches a protective layer; the downward drilling stroke comprises a constant speed section in which drilling is carried out at a constant rotary speed Vco, and a deceleration section for reducing the rotary speed after the drill cutter touches a base plate layer; and the upward return stroke starts when the base plate layer is drilled through, the constant rotary speed Vco starts whenthe drill cutter touches a circuit board layer and ends when the circuit board layer is drilled through by the drill cutter, the deceleration section is adjusted in the processing method to make the touch pad rotary speed Vb lower than the constant rotary speed Vco, and an acceleration section in which the rotary speed increases gradually also exists between the reduced touch pad rotary speed Vb and the constant rotary speed Vco. In the processing method provided by the invention, simple and effective steps can be adopted, and vibration noise of the drilling spindle and PCB front and back surface hole site deviation are further reduced through reducing drilling entering rotary speed.

Description

technical field [0001] The invention relates to a method for processing a printed (manufactured) circuit board (PCB), more specifically, the invention relates to a method for drilling holes on a printed circuit board (PCB). Background technique [0002] In actual production, the printed circuit board PCB board to be processed generally consists of four layers, the uppermost layer is an aluminum plate (to protect the PCB from the influence of the presser foot), the middle is a two-layer circuit board, and the bottom layer is a backing plate (to protect the drilling rig Platform panels are protected from knife scratches). [0003] The precision machining of printed circuit board (PCB) holes requires the drilling machine to have the characteristics of high speed, high precision and high stability. For this reason, the key process equipment for processing printed circuit boards is a multi-axis cascaded CNC drilling machine to ensure the normal operation of the mechanical equipm...

AI Technical Summary

Problems solved by technology

[0008] The inventor repeatedly analyzes figure 1 Later, I gradually realized that points Va and A are the speed mutation points when the Z-axis goes down, and Vb and B points are the speed mutation points during the Z-axis drilling stage; due to the existence of these two speed mutation points, and the A and B sections are tool The stroke section from empty drilling to contacting the PCB surface will result in too high speed and large tool bending when the tool touches the processing surface, which will inevitably cause too much vibration and noise on the Z axis during drilling, resulting in PCB positive and negative faces. Bit inconsistency, thus bringing instability to the Z-axis machining process

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