Measure apparatus of machining deformation and dynamic response for thin-wall part of aircraft

Abstract

A measure apparatus of machining deformation and dynamic response for thin-wall parts of aircraft comprises a pressure signal digital display meter, a power amplifier, a vibration exciter, a function generator, a charge amplifier, a signal collection card, a thin-wall part to be measured, a non-contact eddy current displacement sensor, a dial indicator, a dynamic piezoelectric force sensor, a static pressure sensor, a cross flat-nose pliers assembly, a data acquisition software, a computer system, a magnetic base and an experiment platform. In the measure apparatus, the cross flat-nose pliersand the vibration exciter generate static and dynamic load force; the dial indicator and the dynamic piezoelectric force sensor measure the deformation and dynamic response of the part; the exciting force with required frequency is obtained through the function generator and the power amplifier to simulate the cutting force. The measure apparatus provides a simulation environment and an experiment platform for the parameters selection and optimization during machining process of thin-wall parts. The invention has a good practical value and broad application prospects in fields of high precisemilling study and detection technology.

Description

(1) Technical field [0001] The invention relates to a measuring device for machining deformation and dynamic response of aviation thin-walled parts, which is used for measuring the deformation and dynamic response of thin-walled parts under different simulated cutting forces. The measuring device can be used to adjust the size and frequency of the excitation signal to simulate the real machining and cutting force, and the response and deformation of the thin wall can be obtained through the detection of the equipment. The invention belongs to the technical field of high-precision machining research and detection. (2) Background technology [0002] Aviation manufacturing industry, as an important branch of manufacturing industry, has developed rapidly in recent years. The performance requirements of modern aircraft are constantly improving, and the structural design of aircraft has undergone major changes. From the perspective of part structure, in order to reduce weight, i...

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Problems solved by technology

In the development and production process of a certain type of fighter in China, the overall frame, beams and joints mostly have different degrees of deformation after CNC machining and during the machining process, including bending, twisting, and combined bending and torsion deformation, making it difficult for parts to meet design requirements. It even becomes a waste product, which seriously affects the control of the production schedule and production cost of aerospace products, and aerospace structural parts are usually composed of thin-walled, web, corner and other difficult-to-machine structures and materials. Therefore, in the actual high-speed cutting process, will encounter many problems

[0003] Milling parameters are one of the important factors for the quality of the processed surface. If the selection is unreasonable, the cutting force will be too large, resulting in the deformation of the thin-walled part, resulting in the out-of-tolerance of the product, or the vibration of the thin-walled part. Vibration lines are formed on the surface, which not only seriously affects the processing quality of the surface, but also requires a second grinding, which greatly reduces the processing efficiency

For a long time, although people have accumulated relatively rich empirical data in the selection of cutting parameters for processing, many empirical parameters are no longer applicable due to changes in the combination conditions of machine tools-tools-workpieces, especially when domestic manufacturing companies have introduced a large number of advanced However, due to the lack of effective means and tools for selecting cutting parameters, we can only rely on the data provided by foreign machine tool and cutting tool manufacturers for reference, and cannot give full play to the performance of advanced equipment, which greatly restricts the development of the manufacturing industry.

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