| 摘要 |
PROBLEM TO BE SOLVED: To enhance the degree of a hole position in deep hole working to a desired precision in a short period of time.SOLUTION: During drilling using a gun drill, the quantity of displacement of a wall surface of a hole already formed in a workpiece caused by receiving a load placed on the wall surface from the gun drill is predicted. Then curvature correction measures for hole working based upon the predicted quantity of displacement of the wall surface of the hole are included in a product design stage (S10). The work for which the measures are taken is actually drilled using the gun drill (S40, ...) to secure the desired degree of the hole position without repeating trial working and equipment manufacturing/adjustment like a prior art. Consequently, man-hours for repetition of the trial working (S40) and equipment manufacturing/adjustment (S30) are unnecessary, and the degree of the hole position in the drilling can be enhanced to desired precision in a short period of time. |
