Patent ID: 9333563
Filing Date: 2016-05-10
CPC Classification: B23B,B23Q,G05B,Y10T

Claim Text:
1. A drilling work control method by a drilling work device including a control system controlling drive systems that make a workpiece and a tool that forms a hole in the workpiece execute relative rotating motion and relative feeding motion therebetween, the workpiece includes forming areas of a predetermined number that is a plurality divided by being formed of materials of different qualities, the tool forms the hole over two or more working object layers, the drilling work control method comprising: detecting a load torque applied to the tool; determining a working start of drilling work for the workpiece; determining two or more forming areas respectively in order of drilling work as two or more working object layers arrayed in a feeding direction that is a direction of the feeding motion based on a times of occurrence of variation of the load torque by a predetermined variation coefficient or more after the working start and a layout of the working object layers of the workpiece preset in the control system; deciding a spindle speed of a rotating motion and feeding speed of the feeding motion corresponding to materials forming the working object layers that are determined; determining that a working object layer of the working object layers is a working finishing layer, determining that the load torque has reduced by a predetermined reduction rate or more, and determining that the tool is at an immediately before penetration position that is immediately before penetrating the workpiece in the working finishing layer by sensing that a load torque reduction is the predetermined reduction rate or more in the working finishing layer, controlling the drive systems so that the tool moves forward at a slower speed from the immediately before penetration position to a working finishing position; and detecting the working finishing position where the tool penetrates the workpiece and finishes drilling work, and making the feeding speed a slow feeding speed that is slower than a working feeding speed in the working finishing layer.