Intelligent development direction of automotive checking fixtures
checking fixtures as in the production manufacturing industry to measure and monitor various dimensions of raw products, position degrees, contour degrees, gaps and surface differences, with easy operation, stable and durable, data intuitive characteristics, widely used in the automotive manufacturing industry. The application of modern checking fixtures in China’s automotive manufacturing industry has been gradually promoted along with the development of joint ventures, and a complete industry chain of automotive checking fixtures has been formed. In the 21st century of rapid development of science and technology, many automotive checking fixture enterprises no longer use the traditional checking fixture production method, have adopted the intelligent checking fixture production method. So what are the advantages of intelligent inspection? Let’s talk about the following.
Body size accuracy control is a key technology for automotive OEMs, whether it is “2mm engineering” or “6sigma management”, the essence of which is inseparable from the data-based inspection monitoring system, through the analysis of the manufacturing process inspection data modeling Control the body and parts manufacturing dimensional deviation source, to ensure the stability of manufacturing, and ultimately improve the assembly accuracy of the whole vehicle. However, the current general use of manual gage inspection, measurement efficiency is low, manual measurement error is large, and the use of “through stop gauge” measurement leads to the inability to obtain specific values in the measurement efficiency and manual testing errors lead to difficulties in the statistical analysis of the system data, affecting the quality of the vehicle.
The contradiction between the generally low manufacturing accuracy of the checking fixture and the continuous improvement of the vehicle’s accuracy is becoming more and more prominent, and the current manufacturing accuracy of the checking fixture is still stuck in the manufacturing accuracy of the positioning hole of -0.1~+0.05mm, the manufacturing accuracy of the inspection module ±0.1mm, and the manufacturing accuracy of the inspection module size ±0.15mm dimensional accuracy level. Corresponding to this, the quality accuracy requirements of the whole vehicle is getting higher and higher, the accuracy of large interior parts assembly requirements ≤ 1mm, structural injection parts size accuracy requirements have reached 0.5mm, key matching requirements can reach 0.3mm, the current China’s traditional checking fixture if a significant increase in manufacturing accuracy, in the current level of manufacturing process will bring higher processing difficulties, processing costs are also large.
On the basis of the traditional checking fixture, the intelligent checking fixture adds automatic measurement mechanism, combined with the information processing system to automatically generate the parts inspection report and data analysis report, which improves the measurement efficiency, reduces the manual measurement error, avoids the error of data processing and analysis, and improves the accuracy of the inspection report and measurement efficiency. Automatic statistical analysis and comparison of online processing product inspection data can identify consistency, stability and coherence of measurement data dimensions. The alarm rules for abnormal dimensional fluctuations and abnormal change trends are designed in the program to achieve preventive alarms for the production line, avoiding unqualified products, batch manufacturing and continuous deterioration of the production line, and minimizing the quality loss of checking fixtures.
The function of intelligent checking fixtures need to effectively determine the quality status and trend of the parts, making full use of industry photoelectric technology and machining technology, so that automotive inspection has a higher level of flexibility and intelligence to improve the technical and cost competitiveness of the inspection enterprise. At present, laser measurement technology is also an important part of the development of automotive inspection technology is gradually applied.
The application of laser measurement technology in automotive manufacturing is of great significance to improve the quality of automobiles. Laser scanning measuring instrument combined with data processing, 3D reconstruction and digital model comparison, data scanning and acquisition of ATIA/UG 3D digital model of the part under test and C. The compliance and discrepancy points of the part size and digital model are derived, and the final inspection report is output.
Traditional automotive parts checking fixtures are usually tested, analyzed and processed through sampling data to determine compliance. However, as the level of automotive manufacturing continues to improve, the functional requirements of automotive manufacturers for parts checking fixtures have shifted from determining conformance to in-line, fully digital measurement of dimensions, with data statistics and analysis to determine whether the monitoring manufacturing system is stable. Currently, the rhythm of automotive production lines and parts lines is typically tens of seconds, and manual operation is not possible, so checking fixtures need to move in the direction of intelligence and automation.