Method for monitoring hole roundness error in deep hole drilling in real time

Abstract

The invention discloses a method for monitoring a hole roundness error in deep hole drilling in real time. The method comprises the following steps: 1) acquiring a cutter bar vibration signal in deephole drilling in real time; 2) constructing an improved empirical wavelet threshold noise reduction method to be applied to cutter bar vibration signal processing, and realizing extraction and noise reduction of frequency multiplication signals of 8-frequency multiplication or above of the main shaft rotation frequency in the cutter bar vibration signals; 3) calculating the energy sum of the extracted frequency multiplication signals of 8-frequency multiplication or above of the main shaft rotation frequency after noise reduction as a detection index; and 4) monitoring the hole roundness erroraccording to the size of a detection index value. According to the invention,the method has the advantages of being simple, reliable, easy to implement, low in cost, high in real-time performance andthe like, is suitable for monitoring the deep hole roundness error in real time in engineering practice, achieves real-time, online and nondestructive detection of the hole roundness error in deep hole drilling, and has important engineering practical value.

Description

technical field [0001] The invention belongs to the technical field of real-time monitoring of deep hole processing, and relates to a method for real-time monitoring of hole roundness errors in deep hole drilling. Background technique [0002] In machining, a deep hole is generally defined as a hole with an aspect ratio greater than 5. Deep hole drilling is to install the special cutting tool on the hollow long drill rod, and the workpiece is installed on the worktable, so that the tool performs high-speed rotating motion relative to the workpiece to achieve cutting. Deep-hole parts have been widely used in high-tech fields such as aerospace and new energy equipment, and play an important role, such as hollow spindles and complex shell parts of aero-engines, tube sheets of steam generators in nuclear power plants, super (super) Critical steam turbine bolt holes and valve stem sleeves are the core components necessary for energy transmission and power conversion in mechanica...

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Problems solved by technology

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the object of the present invention is to provide a method for real-time monitoring of roundness errors in deep hole drilling, which solves the problems of low efficiency, easy to cause secondary damage and inability to detect globally in existing detection methods. The problem; the method is simple and reliable, low cost, high precision, real-time online monitoring can be realized, and it is easy to apply in engineering practice

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