Advanced Materials Research Vols. 314-316

Abstract: Aiming at the difficulty of measuring orientation degree of polymer material online, a soft-sensing approach based on ultrasonic velocity measurement is proposed．Firstly, the ultrasonic velocities of polymer samples are measured using a DSP-based ultrasonic velocity measurement circuit, with the ultrasonic sensor perpendicular to the extrusion direction of polymer material, the orientation degrees of samples are calibrated with infrared spectroscopy, the relationship between the ultrasonic velocities and the orientation degrees are then established based on SVM. With the measurement model and the ultrasonic velocity measured online, the orientation degree of polymer material can then be measured online. Test results in Lab shows that this approach can implement accurate measurement, and the relative error is about 5%.

Abstract: In this thesis, the digital figure of the defect of the casting elements is extracted by PCA. And a new method that simplifies the automatic quality detection is also brought forward. The author not only expounds the theory of PCA, the calculating method, the segmentation of digital figure and the feature extraction, but also analysis the real example to optimize the selecting of the preferences. This thesis is valuable in the real manufacture.

Abstract: Analysis for the process of piston’s production is very important for finding problems in the production chain. SPC is used to analyze the abnormity of the process according to four patterns. Due to doing with tremendous data, it’s necessary to develop a software system to help finishing analysis. The application of analysis system can reduce the probability of producing rejects.

Abstract: This paper presents an approach to diagnose and improve the quality management process based on workflow mining technology. In order to inspect each improvement stage in the PDCA lifecycle, an adaptive process mining method is proposed to reconstruct the workflow models from logs. In this method, a sliding window is defined on the process audit streams, and the sliding window size and process schedule method are continuously adjusted by the updating rules to adaptively find various stages of the process changes implied in the workflow log. Case study and comparisons are used to illustrate the accuracy and high performance of this algorithm in the end.

Abstract: Descaling nozzles, generator of high-speed waterjets, are key components in high-pressure waterjet descaling system. Jet performance of the nozzle has great effect on hot-rolling steel billet descaling. Most domestic manufactures provide nozzle structural data and impact force scale with rated pressure, such as orifice diameter, injecting angle and scattering angle. However, jet distribution shape and jet impact force distribution and strength, which are major parameters affecting steel billet descaling quality, are not available from manufactures. A jet performance test device for nozzles was developed in this paper. Two and three dimensional graphs of jet impact force distribution with different standoff distance were obtained. Shape of jet distribution area was indicated in two dimensional graphs while jet impact strength and distribution were given in three dimensional graphs, providing evidence for jet performance judgement. Injecting angle, scattering angle and flow volume coefficient could also be measured with the device. A fan-type nozzle used for scale removal was tested. Results obtained were presented and discussed.

Abstract: the paper analyzes reason for the higher uncertainty in the planeness measurement of wood-working machine tools by leveling ruler with adjustable gauge block; proposes a new design idea of new adjustable gauge block and its measuring performance and calibration requirements; and analyzes its uncertainty of measurement.

Abstract: Parameter testing is the most important process during ballast production, only the products whose parameters conformed to the standard could be passed to the next procedure. A quality information system was designed to replace the manual operation. Based on the computer controlled auto-test facilities, the information system recorded the performance parameters of the ballasts in real time, the statistics of product quality such as the fail ratio was performed periodically. When the fail ratio exceeds the set thresholds, an alarming e-mail will be sent automatically to the related managers and designers. The adoption of database makes history data searched and reviewed conveniently, and the statistics provide a powerful tool for analysis and decision-making. Application of the system have shortened the time for defects statistics and evaluation, and helped to improve the production efficiency and product quality.

Abstract: With the development of RFID technology, we can identify, locate, track and monitor items in supply chain, retail store, and asset management applications. RFID has become a key technology in the Internet of Things. But RFID data can’t be effectively managed by only using traditional data model because they have their own unique characteristics, such as aggregation, location, temporal and history-oriented, which have to be fully considered and integrated into the data model. Therefore, the architecture of RFID spatio-temporal data management is proposed in this paper. We provide a brief overview of RFID technology and highlight a few of the spatio-temporal data management challenges, such as RFID middleware, RFID event processing, In-memory cache.

Abstract: Effect of weld metal hardening property on the deformation behavior and crack driving force of strength mismatched welded joint with crack has been investigated using finite element method under plain strain condition. The results show that when the apply load is small, there is only small scale deformation around the crack tip, the whole structure is still in linear or small scale yielding condition therefore the weld metal hardening property has no significant effect on crack driving force. As the applied load increasing, the deformation region enlarges and at the same time the deformation level around the crack tip deepens, the increasing of weld metal hardening property decreases the local deformation level, consequently leading to the decreasing of the crack cracking force.

Abstract: By only applying a after the event exam in the quality control of the batch production is not enough to meet the needs of modern large-scale production. To a certain extent, modern quality control is a dynamic process of the steady-state judge and adjustment. A simple and reliable steady-state judge rule and method is the premise to guarantee the normal operation. This paper provides a quantitative method to evaluate production process steady-state by analyzing influence factors based on mathematical statistics. The method is both suitable for simple production process and complex production process with sub-processes.