Switching method ofpress pin switching device of printed circuit board (PCB) boring machine

Abstract

The invention discloses a press pin switching device of a printed circuit board (PCB) boring machine and a switching method thereof. The press pin switching device comprises a spindle unit, a scrap absorption cover unit and a worktable unit. One end of the scrap absorption cover unit is connected with the spindle unit, and the worktable unit is arranged below the scrap absorption cover unit. The scrap absorption cover unit comprises a rectilinear motion device, a sliding device and a scrap absorption cover main body. The rectilinear motion device and the sliding device are arranged on the scrap absorption cover main body. The sliding device comprises a sliding base and a sliding plate arranged on the sliding base, and one end of the sliding plate is connected with the rectilinear motion device. A tool changing position used for meeting the tool changing requirement and a press pin position used for press pins in different sizes to be placed at are arranged on the sliding plate.

Description

technical field [0001] The invention relates to a PCB drilling machine, in particular to a presser foot switching device of the PCB drilling machine and a switching method thereof. Background technique [0002] With the increasing development of the electronics industry, PCB drilling is developing towards high-density, tiny holes, and multi-layer boards, which puts forward higher requirements for aperture and processing accuracy. Therefore, higher requirements are put forward for the PCB drilling machine. For PCB drilling machines, the drilling accuracy largely depends on the Z-axis components, and the presser foot switching component closely related to drilling has a very important impact on the drilling accuracy, especially when drilling micro-holes. The size of the presser foot and the dust collection situation have a great influence on the machining accuracy. The chip suction cover unit mainly completes two functions during the drilling process: during the drilling pro...

AI Technical Summary

Problems solved by technology

In order to allow the collar of the drill to smoothly extend out of the presser foot during tool change, the diameter of the large hole 22 needs to be large enough, resulting in a large size of the entire presser foot

Since the large and small holes are on the same presser foot, the switching of the presser foot in this way actually refers to the switching of the large and small holes, not the real switching of the presser foot. The biggest disadvantage of this presser foot switching The reason is: no matter when drilling a large hole or a small hole, the entire presser foot is in contact with the plate surface, especially when drilling a small hole, because the large hole 22 and the small hole 21 are connected, resulting in a small hole when drilling. The compression state of the plate surface around the hole is not ideal; because the negative pressure of vacuuming cannot reach the ideal state, it may cause the peripheral aluminum plate drilled through the large hole 22 and the small hole 21 to be sucked up and not flattened. Under the circumstances, it is easy to increase the deviation of the drilling hole, which will greatly affect the processing quality of the micro hole; at the same time, the large hole is large and the small hole is small, so that the tool with the middle diameter is not suitable for drilling with large or small holes. too suitable

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