Adjusting method of pressing force for controlling interlayer burrs in laminated board drilling

Abstract

The invention proposes a pressing force adjustment method for controlling an inter-drill-layer burr of a laminated plate. The method comprises the steps of determining an undetermined coefficient in a drill force empirical formula through a mathematic statistics method by utilizing the drill force empirical formula and drill force test data; obtaining a credible drill force prediction value of a to-be-optimized working condition machining process; establishing a laminated plate deformation theory model according to an existing theory; determining an extrusion region range of laminated plate mutual extrusion of the laminated plate deformation theory model in a search and debug mode; obtaining a function relationship between a maximum value of an inter-layer gap and a value of pressing force; controlling a target threshold in combination with the given inter-layer gap; and performing parameter optimization on the value of the pressing force to obtain optimal pressing force. According to the method, the optimal pressing force can be obtained through adjustment and the inter-layer gap of the laminated plate is reduced to be in an ideal range, so that the height of the inter-layer burr can be effectively controlled and side effects caused by pressing are avoided as far as possible.

Description

technical field [0001] The invention relates to the drilling technology of a laminated board structure, in particular to a method for adjusting the pressing force for controlling the interlayer burr in the drilled hole of the laminated board. Background technique [0002] The aircraft production process mainly includes parts production and aircraft body assembly, in which the assembly quality directly affects the aircraft performance and safety performance. Airframe assembly consumes a lot of manpower and production costs. According to statistics, its workload can account for 40% to 50% of the overall workload of aircraft manufacturing. A large number of riveting is used in the positioning and connection between aircraft fuselage, wings and other components, and drilling as a pre-riveting process directly affects the quality of riveting. According to statistics, 70% of aircraft body fatigue failure accidents start at structural joints, and 80% of fatigue cracks occur at joi...

AI Technical Summary

Problems solved by technology

For example, in the invention application document with the publication number CN102303261A disclosed by the Chinese Patent Office, a compression structure is proposed, which can adapt to complex curved surfaces to be processed and apply a compression force; but how to obtain a suitable compression force, it does not Propose a mature and effective method

In addition, the current automatic hole-making equipment cannot automatically complete the selection of the pressing force for different materials and drilling parameters, but must rely on the experience of the assembly site for adjustment, or can only choose a fixed pressing force , the efficiency of controlling the compression force is unstable, and it is easy to cause problems such as over-compression or under-compaction

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