Research On Key Technology Of Three Dimensional Multi-elements Measurement Of Parts And The Devdlopment Of Measure System

The development of manufacturing means a lot to the national economy. The currentstatus that the basis of manufacturing technology is instability, the innovation ability isweak and most of products are at low-level need to be changed urgently. The huge gapbetween the international and the domestic technology of online detection, especially thecomplete sets of high-accuracy equipments, has hindered the development of theenterprises and the whole industry. In this context, researches on on-line detectingequipments will be made in this paper, principle targets are complex parts with plentydetecting elements.There are two kinds of detection methods at present, the contact and un-contact,both can not meet the need of plenty-elements measurement. Because the contact methodrepresented by the CMM and the single-way displacement sensors have problems on theefficiency or multi-elements obtained, and the uncontact methods have problems onaccuracy and the measurement tempo.For complex multi-elements measurement, two directions have been sdudied:multi-sensors system and three-dimensional scanning system. The existing achievementsof the first direction are most based on CMM, and do nothing to the poor efficiency. Thelast direction need to solve the conflicts between huge data and the measurement tempo.Thus, these two directions would be the focused research in this paper.After analyses the characteristic of detection of complex parts and elements ofseveral typical parts, the paper proposed the rule of elements grouping and the designmethod of multi-elements measure system that include elements analyses, groupingelements, measurement system design for single group, measurement scheme for thewhole system, data fusion of the several elements, comprehensive error evaluation andSPC.The paper then make research on each parts of the design method. First of all,measurement method of each groupe including the internal hub group, the contour group,the cylinder and end face group and the holes group has been designed.Secondly, the paper proposes the optimizing index of the integrated system,completes the system design of splined hub, and finishes the prototype trial.Thirdly, the paper proposes a data fusion method named as mutative-scale data fusion based on the multi-sensors system. This method combines the theory of multiviewconnection and the multi-sensons detection. Different scales of data have been used todescribe the target and finally form the three-dimensional digital model.At last, the size, shape and position error evluations methods have been discussed in.The paper then makes the precision analyses of measurement system on differentelements. At last of this chapter, SPC system has been introduced as one of the key jobson future.