A method for real-time monitoring of hole roundness error in deep hole drilling

Abstract

A method for real-time monitoring of hole roundness errors in deep hole drilling, 1) real-time collection of tool bar vibration signals in deep hole drilling; 2) constructing an improved empirical wavelet threshold noise reduction method, which is applied to tool bar vibration signal processing, Realize the extraction and noise reduction of the 8 times and above frequency multiplication signal of the spindle rotation frequency in the tool bar vibration signal; 3) Calculate the energy sum of the extracted noise-reduced 8 times and above frequency multiplication signal of the spindle rotation frequency, as Detection index; 4) According to the value of the detection index, monitor the roundness error of the deep hole. The method disclosed by the invention has the characteristics of simplicity, reliability, ease of operation, low cost, and strong real-time performance, and is suitable for real-time monitoring of deep hole roundness errors in engineering practice, and realizes real-time, online, and non-destructive drilling of deep hole roundness errors. Detection 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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