A three-dimensional dynamic grinding force detection device and its decoupling algorithm

Abstract

The invention discloses a three-dimensional dynamic grinding force detection device and its decoupling algorithm, which mainly solves the problems of low natural frequency, narrow measurable dynamic force range and piezoelectric grinding force measurement of the existing resistance strain grinding force measuring instrument. The instrument is complicated to manufacture, expensive, unable to detect static force, the multiple linear regression decoupling algorithm is highly dependent on the linearity of the detection device, and the decoupling effect is unstable. The three-dimensional dynamic grinding force detection device is mainly composed of a base, a column, a support, an elastic thin plate group, an upper cover plate and a resistance strain gauge group. The workpiece to be processed is installed on the upper surface platform through threaded connection. During grinding, the grinding force acts on the workpiece and is transmitted to the column through the upper surface platform, causing the column to deform accordingly, and then transmitted to the three sets of elastics installed in parallel with it. Thin plates, three groups of elastic thin plates are installed in two pairs vertically, causing the three groups of resistance strain gauges pasted on the elastic thin plates to produce corresponding resistance value changes, and after signal conditioning and collection, they are transmitted to the PC, realizing Three-dimensional dynamic grinding force detection. The decoupling algorithm uses the BP neural network as the decoupling model, and optimizes its initial weight and threshold parameters through the genetic algorithm to obtain the optimal decoupling model and realize the high-precision decoupling of the three-dimensional grinding force signal. The invention has ingenious structural design, high natural frequency, wide range of measurable dynamic force, and can measure static force at the same time, with low inter-directional coupling and simple manufacture, which greatly reduces the manufacturing difficulty and production cost of the three-dimensional dynamic grinding force detection device, and at the same time The decoupling algorithm has fast convergence, high precision and high reliability, and has good practical and popularization value.

Description

technical field [0001] The invention belongs to the technical field of machining testing, and relates to a three-dimensional dynamic grinding force detection device and a decoupling algorithm in the grinding process of precision parts. Background technique [0002] Grinding is an indispensable processing method in the processing of precision parts, and its processing accuracy will directly affect the surface quality and performance of the workpiece. Grinding force is an important factor affecting the precision and efficiency of grinding. How to measure it accurately, and then realize the real-time control of online grinding force, has become an important guarantee for improving the precision and quality of grinding. At present, the following devices and methods are mainly used at home and abroad to detect and decouple the three-dimensional dynamic grinding force: [0003] 1. The resistance strain type grinding dynamometer adopts mechanical structures such as octagonal rings...

AI Technical Summary

Problems solved by technology

[0007] 1. The mechanical structures such as octagonal rings, thin-walled cylinders, and cross ribs are used as elastic elements. In order to ensure sufficient deformation under the action of grinding force, the rigidity cannot be improved. The overall natural frequency of the dynamometer is too low, often at several Ten Hz, the frequency range that can detect dynamic force is narrow, which cannot meet the detection requirements of high dynamic grinding force in the process of precision grinding of complex curved surfaces

[0008] 2. The manufacturing process of the piezoelectric grinding dynamometer requires precise cutting of the quartz crystal, and the assembly process of the crystal and the mechanical structure requires high technology. The price of the mature piezoelectric grinding dynamometer abroad is high, causing users In addition, the piezoelectric grinding dynamometer cannot detect static force and static moment

[0009] 3. The multiple linear regression decoupling algorithm uses linear fitting to process the calibration data of the dynamometer, but the calibration data of the actual dynamometer cannot be strictly linear, and the linearity of the dynamometer will seriously affect the fitting error , so the multiple linear regression decoupling algorithm is highly dependent on the linearity of the dynamometer, resulting in an extremely unstable decoupling effect

Images