Assembly Quality Detection Research Of Ball Screw In The Process Of Maintenance

CNC machine tools are the key to the basic manufacturing equipment, and ball screw is the key components of CNC machine tool. When the assemblage of the ball screw is error, it will seriously affect the service life and processing schedule. Thus it will also affect the processing performance, machining quality and production efficiency of the machine tool. So ensure the quality of ball screw assembly has important practical significance to improve the processing quality and production efficiency. Based on actual production demand, this paper puts forward a detection method of ball screw assembly quality based on current signal, vibration signal and machine tool the internal signal.This paper first summarizes the present research status at home and abroad and the existing problems from the area of screw characteristic analysis and feature extraction method. Then this paper analyzes the force of the ball screw and the assembly process and finds a few key factors affecting the quality of ball screw assembly, and then analyzes the influence mechanism of assembly quality, to determine the research method of ball screw assembly quality problem. Based on the influence mechanism of ball screw assembly quality and the actual situation of the industrial field, this paper established the detection methods based on the current signal, vibration signal and machine internal signal. Then I set up the ball screw assembly quality testing experiment platform according to the existing equipment.This paper analyzes the characteristic value changes caused by different assembly and the change trend of fourier spectrum, kurtosis and modal parameters based on the current signal, vibration signals and machine internal signal. Then this paper chooses characteristic values which is related to ball screw assembly quality problems to evaluate the ball screw assembly quality problems, and researches which kind of signal characteristic can reflect the assembly quality under a variety of assembly quality problems. At last, this paper chooses the characteristic value which is especially related to ball screw assembly problem to evaluate the ball screw assembly quality problems. At last, this paper verifies evaluation indexes of ball screw assembly quality and the verification results show that the characteristics of the selected parameters can be used to detect the ball screw assembly quality.