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46 results about "Statistical quality" patented technology

Statistical quality control is the observation of variables of a manufacturing process over time and the application of statistical analysis of those variables to define operating windows that yield lower defect products. This method is used primarily for manufacturing lines rather than chemical processing...

On-line monitoring method for cutter abrasion damage based on main shaft driving current and working step.

The invention discloses an on-line monitoring method for cutter abrasion damage based on main shaft driving current and working step. The method is made by the following steps that realizing communication with a numerical control system to obtain machining working step information, meanwhile, the driving current and the load of the main shaft are monitored, and on the basis of a normal cutter andabrasion damage cutter cutting torque difference analysis and statistical quality control principle. Control graph for drawing average current / load required by each working step processing, a control graph control line is reasonably formulated, the abrasion state of each working step is judged, and a tool changing or cutter edge grinding rule is formulated. According to the variation of instantaneous main shaft current or instantaneous load with the deviation from the instantaneous current / load in normal machining in each working step of machining, the cutter breakage is determined, the alarm signal is sent to inform the numerical control system to emergency shutdown so as to avoid the serious consequences of damaging the workpiece and the machine tool. According to the method, on onehand, the part rejection rate and the machine tool fault rate can be reduced, on the other hand, the service life of the cutter can be prolonged to the maximum extent, and the use cost of a plant cutter is reduced.
Owner:BEIJING UNIV OF TECH +1

Oceanographic engineering quality control information system

The invention relates to the field of offshore oil engineering and provides an oceanographic engineering quality control information system. The oceanographic engineering quality control information system comprises a management setting module, a construction quality managing module, a debugging quality managing module, a file managing module and a statistical analyzing module, wherein the management setting module is used for setting a user login password and authorities of a user, setting essential data and preserving welder qualifications; the construction quality managing module is used for determining construction quality acceptance when monitors that information input by a general contractor is examined and approved by an owner party and a third party; the debugging quality managing module is used for acquiring the information input by the general contractor and recording left problems for subsequent elimination; the file managing module is used for uploading, checking and downloading item information; and the statistical analyzing module is used for extracting various data input in the earlier stages according to a user command and giving an analysis result. The oceanographic engineering quality control information system is capable of finishing daily quality inspection work, performing real-time quality information statistics, collecting the statistical information and generating weekly reports and monthly reports needed in working automatically, and the aid of the oceanographic engineering quality control information system, traditional paper file transmission can be replaced to achieve automatic real-time data statistics, so that efficiency in quality management is improved greatly.
Owner:CHINA NAT OFFSHORE OIL CORP +1

A blast furnace molten iron quality monitoring method based on KPLS robustness reconstruction error

ActiveCN107463093ASolve the problem of fault identification in quality monitoringSolve the problem of fault identificationAdaptive controlHigh dimensionalData Matrix
The invention provides a blast furnace molten iron quality monitoring method based on KPLS robustness reconstruction error. The method comprises the steps of collecting blast furnace operating parameters and molten iron quality variables at the same moment; selecting a training set and standardizing the same; mapping input data in the training set into a high-dimensional feature space to obtain a Gram matrix K and performing centralization processing; acquiring new blast furnace operating parameter and molten iron quality variable samples including abnormal working conditions as a testing set and performing standardization processing; mapping an input data matrix in the testing set in to the high-dimensional feature space to obtain a Gram matrix and performing centralization processing; building a partial least square model to describe the high-dimensional feature space and an output data matrix; checking whether a blast furnace iron making process is abnormal by using a T2 statistical quality and a Q statistical quality; calculating a reconstruction value of original process variable data and identifying process variables causing abnormal working conditions of the blast furnace. The method can accurately identify faults in blast furnace molten iron quality monitoring and improve molten iron quality monitoring performance, thus guaranteeing blast furnace molten iron quality.
Owner:NORTHEASTERN UNIV
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