Plc-Based Aerospace Thin-Wall Part Processing Fixture. Issue 2 (March 2020)

• Record Type: Journal Article
• Authors: Zhao, Haoyu; Tang, Bo; Li, Wenchao; Li, Haopu; Wang, Fubin; Sun, Guangyao; Xie, Chunyang; Xing, Xinyuan
• Is Part Of: IOP conference series. Volume 782:Issue 2(2020)
• Publication Date: 2020-03
• Subjects: Materials science -- Periodicals; 620.1105
• DOI: 10.1088/1757-899X/782/2/022055
• Languages: English
• ISSNs: 1757-8981

Abstract

Abstract: Incorrect clamping structure layout is easy to produce machining vibration, which leads to machining vibration and seriously affects the machining quality of workpiece surface, especially for thin-wall workpiece. In this paper, a structure which can adjust the clamping force at any time is designed to restrain the machining vibration of the workpiece, so as to improve the machining quality of the workpiece surface. The structure mainly solves the problem of adjusting the pressure plate by changing the force signal into micro displacement to automatically adapt to the pressure needed by the workpiece. Analyze the function of the structure, split into multiple modules, through the selection and design of these modules to meet the functional requirements, assemble each module to complete the structure design. The structure includes mechanical and control modules, and the push rod structure which can move up and down is used to adjust the pressure of the pressure plate. Because servo motor has feedback ability, servo motor control is selected and power is provided to push rod. In order to automatically adjust the pressure of the pressure plate, it is necessary to place a pressure sensor at the compression end of the pressure plate. The pressure sensor can feedback the pressure of the current workpiece in time, and then convert the electrical signal into a digital signal through the digital quantizer, so that the data can be processed. PLC processes the signal, and the function of PLC is as follows: it can set a value at will, can receive the digital signal of the pressure sensor and compare it with the set value, the difference is transmitted to the servo motor, and the servo motor selects forward or reverse to drive the push rod forward or backward, so as to realize the automatic adjustment of the pressure of the workpiece by the pressure plate. The correct assembly control class of these components needs the correct wiring mode, and the mechanical class needs to design the connection structure to ensure the connection between different components.