Method for accurate numerically-controlled drilling on large-curvature arc surface

Abstract

The invention relates to a method for accurate numerically-controlled drilling on a large-curvature arc surface, and belongs to the technical field of numerically-controlled machining. The method comprises the following steps: selecting a numerically-controlled machine tool meeting machining requirements; clamping; installing a centre drill; running a numerical control program; manually controlling a feed depth h and a feed speed f, and drilling into a part with a depth of 2-3mm away from a contact point of the curved surface at a constant speed; reinstalling a drill bit for machining a primary hole according to a diameter ratio of 80% and the final dimensions of a hole diameter; setting a fixed feed step length L, and setting a circulating lifting height H and a lifting surface; running the numerical control program, and manually controlling the feed speed f to ensure that the hole positions of a setting point of the drill bit and a contact point of the centre drill are the same; drilling the primary hole; reinstalling a drill bit for makeup machining; running the numerical control program, and drilling a final hole in a makeup manner. With the adoption of the method disclosed by the invention, the conditions of drill bit setting point play, part scratches, drill bit in-hole breakage, drilling direction deflection and the like occurring in the drilling process can be effectively avoided, the machining efficiency is high, and the accuracy meets standard requirements.

Description

Technical field [0001] The invention relates to a method for precise numerical control drilling on a large curvature arc surface. The process is realized by a numerical control machine tool and belongs to the technical field of numerical control processing. Background technique [0002] In recent years, with the continuous progress of titanium alloy material properties and processing technology, a large number of aerospace parts have adopted titanium alloy materials. Due to the high strength and rigidity of titanium alloy materials, it is often used in some connecting parts and load-bearing parts. During the processing, there are more requirements for drilling small and medium diameter (8-12mm) through holes on large curvature surfaces. However, due to the high strength of titanium alloy and the poor rigidity of small-diameter drill bits, when drilling on curved surfaces, the direction of force on the drill bit diverges to the surroundings, and the axis of the drill bit does not ...

AI Technical Summary

Problems solved by technology

However, due to the high strength of titanium alloy and the poor rigidity of small-diameter drills, when drilling on curved surfaces, the direction of force on the drill diverges to the surroundings, and the axis of the drill does not coincide with the direction of feed. In the case of breakage in the hole, deviation of the drilling direction, etc., in addition to slow feed and low processing efficiency, it is easy to cause damage to the parts out of tolerance, which seriously affects the production and delivery of the product

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