Device and method for automatic hole making of stretched skin parts

Abstract

The invention relates to a skin stretch part automatic hole production device and method. According to the technical scheme, the upper end of a housing of the automatic hole production device and a profiling plate are fastened at two ends of a mould main body through articulation hole screws respectively; the automatic hole production device and a nut which is matched with a lead screw are fastened at the lower end of the housing; a lower end cover is fastened at the lower end of the housing; a motor is arranged in the housing; a reducer is fastened at the lower end of the housing of the motor; an output shaft of the motor is connected with an input shaft of the reducer; threads formed on an output shaft of the reducer are matched with the nut; a bearing I, a shaft sleeve, a bearing II and an upper end cover are pressed into a chuck casing in turn; an outer wedge block is pressed into a beating inner ring; the bearings are compressed through the end covers and the nut; an inner wedge block is matched with the outer wedge block; a drill bit is clamped by the inner wedge block through the vertical movement of an elastic bolt; the drill bit is connected with the motor; the chuck casing is in screw joint with the upper end of the motor and is limited through a set screw; the outer edge of the motor is matched with the inner wall of the housing. According to the skin stretch part automatic hole production device and method, the hole production accuracy is high, the explosion is not produced, and the damage is not easy to cause during lifting, carrying and storage.

Description

technical field [0001] The invention relates to a hole-making process for skin stretching sheet metal parts, in particular to a process and a device for directly and automatically making holes on a mold. Background technique [0002] Aircraft skin stretch forming means that the two ends of the sheet blank are clamped in the jaws of the stretching machine, relying on the worktable to lift the mold and contact the blank, resulting in uneven tensile strain; The wrapping motion conforms the blank to the mold surface, resulting in the final shape of the part. Stretch forming (referred to as stretch forming) is the main forming method of double curvature aircraft skin. The process flow of skin stretching parts manufacturing is inspection→cutting→wiping→marking→pre-drawing→back or quenching→final drawing→hole making→edge trimming / removal of margin. [0003] At present, the basic structure of Mengla mold is as follows: figure 1 shown. The following two methods are mainly used fo...

AI Technical Summary

Problems solved by technology

The above-mentioned method of manufacturing process holes mainly has the following disadvantages: ① Find the skin process hole by marking the method, and the error of the hole center is large

②Insufficient precision of manual hole making

After finding the center of the circle, it is difficult to control the drilling speed, feed rate, verticality and other process parameters by manual hole making, so the quality of hole making is unstable and poor

③ If it is necessary to make reference holes in the middle of the skin, such as girders and frame positioning holes, the above method is difficult to achieve

The above-mentioned method of making process holes mainly has the following deficiencies: ①The hole making precision is insufficient

It is difficult to control the process parameters such as drilling speed and feed rate in manual hole making, so the quality of hole making is unstable and poor

②If the skin needs to make reference holes in the middle of the skin, such as girders and frame positioning holes, the above method is difficult to achieve

③ It is necessary to install the drilling formwork assembly on the mold, which is easily damaged during hoisting, handling and storage

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