Thick plate segmented drilling method and drilling machine

Abstract

The invention belongs to the technical field of thick plate drilling, and discloses a thick plate segmented drilling method and a drilling machine. The thick plate segmented drilling method comprisesthe following steps of step 1, a cutter drills into a plate for a certain distance at a first rotating speed, and the position of the cutter is maintained for a period of time at the first rotating speed; 2, while the cutter drills into the plate, the drilling speed of the cutter is gradually increased till the set drilling speed is reached, the cutter continues to drill into the plate for a certain distance, and the position of the cutter is kept for a period of time at the first rotating speed; and the step 2 is repeated until the cutter drills down to the final depth. The smooth finish of ahole wall is ensured by not returning the cutter in each segmentation; and the drilling speed is gradually increased while the plate is drilled, the speed of accelerating the cutter to feed again inthe plate is small, the axial force impact borne by the cutter when the cutter cuts into the plate can be reduced, and cutter breaking is avoided. By means of the method, less segmented machining canbe achieved, cutter breaking is not likely to happen, and the effect of greatly improving the machining efficiency can be achieved.

Description

Technical field[0001]The invention relates to the technical field of thick plate drilling, in particular to a thick plate segmented drilling method and a drilling machine.Background technique[0002]In the PCB industry, communication boards, radar boards and special plates, such as military plates, have the characteristics of a large number of laminated layers, thick copper foil, high hardness of the plate substrate, and thicker total thickness of the finished plate. When the single-hole machining is usually not completed at one time, because the chip load is too large, the drilling stroke is too long, and it is easy to break the tool after drilling. It is necessary to drill in sections, which is called section drilling to prevent excessive load. It can cause problems such as broken tool, uneven hole wall, hot drill hair, poor chip removal, etc., to ensure processing quality and processing accuracy.[0003]The main difficulties encountered in the current processing of thick plate segmen...

AI Technical Summary

Problems solved by technology

If there are too few segments, such as three segments, although the processing efficiency is high, the tool breakage is serious and the scrap rate is high

If there are too many segments, although the tool breakage is significantly reduced, the efficiency is greatly reduced, and when the number of segments is large, the drilling stroke is short each time, the drilling times are large, and the motor reciprocates frequently, resulting in high heat generation of the motor and low processing efficiency. low

Therefore, the processing at this stage is usually based on the premise of continuous cutting, and under the condition of ensuring the yield rate, the number of subsections should be shortened as much as possible. However, the number of subsections is still relatively high, which affects the processing efficiency.

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