Accuracy assurance in machining processes

machiningIn the process, there is precision guarantee, this precision guarantee, first of all, machining accuracy overview, machining accuracy refers to, in the machining process, after processing parts, its size, shape, and even the location of geometric parameters, and the degree of conformity with the design requirements, which it is to measure the quality of machining is one of the important indicators, and will be directly on the reliability of the product, the performance and the service life of the product. With the continuous development of modern industry, the requirements for machining accuracy has become higher and higher, so precision assurance has become one of the key technologies in the field of machining.1. Machining accuracy is very important to ensure the quality of the product is of great significance, but also to improve productivity, and reduce costs. High-precision machining can reduce the subsequent repair work to improve the material utilisation rate, while enhancing the competitiveness of the product market. In the field of aerospace, precision instruments, automotive manufacturing, high-precision machining is indispensable. Machining accuracy is affected by a variety of factors, the accuracy of the machine itself will affect it, tool wear will affect it, thermal deformation in the machining process will affect it, the nature of the workpiece material will affect it, cutting parameters will also affect it. These factors interact with each other, together with the machining process to determine the final presentation of the accuracy. Second, the control method of machining accuracy, in order to ensure the accuracy of the machining process, you need to go to a series of control methods, from the selection of machine tools, tool management, process optimisation and other aspects of comprehensive control. 2.1 machine tool accuracy assurance, machine tools are the basis of machining, its accuracy will directly affect the machining accuracy. Therefore, the selection of high-precision machine tools is the first step to ensure machining accuracy. At the same time, regular maintenance and calibration of machine tools is absolutely indispensable. This includes lubrication, cleaning, fastening and other aspects of machine maintenance to ensure the normal operation of the machine components. Calibration is the use of professional measuring tools, the geometric accuracy of the machine tool to be measured and adjusted to ensure that its accuracy meets the processing requirements. Tool is a direct contact with the workpiece in the machining process tools, tool wear and damage will have a direct impact on the machining accuracy. Therefore, tool management is an important part of ensuring machining accuracy. This covers the selection, use, maintenance and replacement of tools. Choosing the right tool with the right material and geometric parameters can improve cutting efficiency and reduce wear. During use, tools should be checked for wear and replaced immediately. In addition, pre-commissioning, pre-grinding and pre-mounting of tools is also an effective way to improve machining accuracy.2.3 Optimisation of process parameters, the selection of process parameters has a direct effect on machining accuracy. These parameters cover cutting speed, feed rate, depth of cut and so on. By optimising these parameters, it can improve the machining accuracy while ensuring the machining efficiency. For example, the appropriate cutting speed can reduce tool wear, improve surface quality; reasonable feed rate can reduce vibration in the machining process, improve dimensional stability. 2. Monitoring and feedback machining process, in the machining process, real-time monitoring of the processing-related status and to be adjusted by feedback to ensure that the machining accuracy of the effective way, which can be achieved by installing a number of sensors such as displacement sensors, force sensors and other sensors, which can real-time monitoring of the machining process and to be adjusted by feedback. This can be achieved by installing some sensors such as displacement sensors, force sensors and other sensors, these can real-time monitoring of tool position, cutting force and other parameters, with the help of these data, can be adjusted in a timely manner to ensure that the processing parameters to ensure the accuracy of the processing, accompanied by the development of science and technology, the use of some advanced technology can be used to significantly improve the accuracy of machining. 3. digital technology plays a role in the field of mechanical machining is more and more widely used to be able to rely on the precise numerical manipulation to Enhance the level of machining accuracy. CNC machine belongs to the typical use of digital technology examples, can be based on pre-programmed procedures to automatically reach the complex processing tasks, significantly improve the accuracy of processing and the degree of efficiency. Precision measurement technology is the key means to ensure machining accuracy. Modern precision measurement technology covers laser measurement, coordinate measurement, etc., they can give high-precision measurement results, which in turn provides the basis for the control of processing accuracy. These technologies can process the size, shape, position and other parameters to be measured accurately, can be found in a timely manner deviation and be corrected.3.3 Computer Aided Design and Manufacturing (CAD/CAM), CAD/CAM technology allows the integration of the design and manufacturing process, through computer-aided design software to carry out the product design, and then directly to the design data to the implementation of the processing of the numerical control machine, so as to reduce human error, improve machining accuracy. 3.4 machine vision technology, machine vision technology by virtue of image recognition and processing technology, can achieve the automatic monitoring of the processing process and quality control. It can identify the position of the workpiece, but also identify the size of the workpiece and other information, and then will feedback this information to the control system, and then realize the automatic adjustment and optimization of the machining process. 3.5 Intelligent Manufacturing Technology, Intelligent Manufacturing Technology, with the help of integrated sensors, and the Internet of Things, big data analysis and other technologies, to achieve the intelligent monitoring of the machining process and management. It can collect all kinds of data in the machining process in real time, and through intelligent algorithms to be analysed and processed, so as to achieve the optimization and control of the machining process. Along with the above structure of the exposition shows that we can see, machining accuracy protection belongs to a systematic project, it is associated with machine tools, cutting tools, process parameters, monitoring feedback and many other aspects. Along with the continuous progress of technology, more and more advanced technology is used in the field of machining, thus creating the possibility of improving machining accuracy. In the future, with the further development of intelligent manufacturing and digital technology, the guarantee of machining accuracy will be more and more accurate and efficient. Fourth, the machining accuracy of quality management, quality management is to ensure the machining accuracy of the key links, which covers the entire process from the procurement of raw materials until the final product inspection.4. Raw material quality has a dominant role, and its quality will directly affect the accuracy of the processed parts, so the raw materials to impose strict quality control is a prerequisite to ensure the accuracy of machining, which covers the chemical composition of raw materials, This covers the chemical composition, physical properties, dimensional accuracy of raw materials to be tested to ensure that it meets the processing requirements, the main point is to implement quality control of key processes, the purpose is to ensure the stability of the processing process and the consistency of the processing results, which can be achieved through the setting of quality control points, the key dimensions and key features of the regular testing. If deviations are detected, immediate action should be taken to correct them.4.3 Process capability analysis is a statistical means of assessing the stability and competence of the machining process to ensure that the process is able to consistently produce products that meet the specification criteria. With the help of process capability analysis, the source of variation in the process can be identified and implemented to take measures to improve the perfect. 4.4 Final inspection and testing is to ensure that the product complies with the design requirements of the last line of defence barrier, which covers the product size, shape, location and other geometric parameters for inspection, as well as the performance of the product for testing and inspection. Considered qualified products, is only through the final inspection of the kind, five, machining accuracy process optimization, process optimization is an effective way to improve machining accuracy, which involves the continuous improvement and optimization of the machining process, 5.1 optimization of cutting parameters, cutting parameters have a direct impact on the machining accuracy, with the help of optimization of the cutting parameters, such as the cutting speed, feed rate, depth of cut, etc., can In the case of ensuring the machining efficiency, improve the machining accuracy, which must be based on the workpiece material, tool material and machine performance and other factors for comprehensive consideration.5. Tool path can be optimised, its optimisation can reduce the vibration and tool wear in the machining process, and thus improve the machining accuracy, which is achieved with the help of computer-aided process planning software, through the simulation of the tool path, to find the optimal machining program.5.3 Cooling and lubrication need to be optimised, cooling and lubrication is an important factor affecting machining accuracy, reasonable cooling and lubrication can reduce cutting heat, reduce tool wear, improve surface quality, which must be based on the machining material and cutting conditions to select the appropriate coolant and lubricant. 5.Optimise the process flow, the optimisation can cut down on non-productive time in the machining process, thus improving productivity. At the same time, it helps to improve machining accuracy. To achieve this purpose, the process flow should be analysed to find bottlenecks and non-value-added links, and then be improved; along with the continuous progress of science and technology, the guarantee technology of machining accuracy is also developing continuously; the development of intelligent manufacturing technology can give new solutions to the guarantee of machining accuracy. Through the integration of sensor technology, as well as Internet of Things technology, and big data analysis and other technologies, can reach the intelligent monitoring and management of the machining process, and thus improve the machining accuracy.6.2 The development of high-precision machine tools, the development of high-precision machine tools will give hardware support for the assurance of machining accuracy. Along with the progress of material science and precision manufacturing technology, the precision of machine tools will continue to improve, bringing the possibility of high-precision machining.6.3 Progress of precision measurement technology, the progress of precision measurement technology will provide more accurate data support for the assurance of machining accuracy. Followed by laser measurement, coordinate measurement and other technologies have developed, the measurement accuracy will continue to improve, to the control of machining accuracy to provide the basis for 6.4 process simulation technology, the use of process simulation technology will provide a virtual experimental platform to ensure the accuracy of machining. Through the simulation of the processing process, can be in the actual processing before the prediction of the processing results, to give guidance to the process optimisation. Conclusion: the guarantee of machining accuracy is a complicated process involving many factors, which not only requires high-precision machine tools and cutting tools, but also requires reasonable process parameters, strict quality control and advanced monitoring technology. The guarantee of machining accuracy will be due to the development of intelligent manufacturing, digital technology, precision measurement technology, and become more accurate and efficient, the future of machining relies more on intelligent, automated technology to achieve a higher level of precision assurance, while process optimisation, quality management, technological innovation in improving machining accuracy will also play an important role through continuous technological advances and technological improvements, machining Through continuous technological advances and process improvements, machining accuracy will continue to improve to meet the needs of modern industry for high-precision products.