Research And Control On Automatic Tool Changing Device Of CNC Machine Tools

With the development of science and technology, industrial production mode isundergoing tremendous change. From manual mill of labor, gradually moving towardsintelligent, automated production mode. At present, in the course of processing machinery,most enterprises still adopt the traditional way of manual tool change, but the traditionalartificial change knife has the following weaknesses:Low efficiency, accuracy is not high.In order to meet the needs of a new round of manufacturing. In recent years, automatic toolchanging device in the processing and manufacturing in the role, becomes more and moreimportant. At present, because automatic tool changing device which directly purchasedfrom the market.The general structure is relatively large, the price is high and thepertinence is not strong.In the light of some small businesses generally adopt the lowefficiency of manual tool to change this situation,Taking XK7132NC milling machine ofour school as the object,study an automatic tool changing device based on parameters ofmachine tool itself. compared with manual tool change is more efficient, and has a strongpractical,automatic tool changing device has both simple and compact structure, lowcost.This paper lay the foundation for the automatic tool changing device with low cost.Firstly, Through investigation and collected literature, analyzed the present researchsituation of automatic tool changer of domestic CNC machine tool,Then analyzes thedefects of existing structure design of NC machine tools, Through the comparison ofvarious design schemes, thus the paper designed economical and practical research ideasand direction.Based on this, the paper designed and analysed the various components ofthe automatic tool change device,by making use of CAD/CAM technology,Thus prototypemodel of CNC machine tool automatic tool change device is finally established.Secondly, the design of CNC machine tool automatic tool change device isstudied.This paper discusses from the following four aspects:This paper introduces themain types of CNC machine tools, the features of the automatic tool changer common andscope of application;Function and composition of ATC; Compared to common all throughthe tool selection, automatic tool changing mode of tool change, the movement of themanipulator and so on, the paper determine the overall scheme of the design of automatictool changer economic type,Select the model by making PLC.Thirdly, this paper focuses on the research of the mechanical structure of automatictool changing device and auto-Control of CNC machine tools.By analysis and calculation,this paper uses linear movement to achieve the loading and unloading cutter movement,and the movement process is relatively simple, but also improve the efficiency of loadingand unloading knife.And also the paper determined the automatic control system andworking process of automatic tool changing device.According to the tool changingmanipulator work requirements, the paper designed the PLC control flow chart.Combinedwith mechanical hand grip the knife, tool changing action, using the selected PLCprogramming to realize the automatic control of the manipulator.