Abstract: Based on loads analysis and failure analysis for high speed face milling cutter with
indexable inserts, the failure criterion of cutter was propounded, and the finite element model of
cutter was established. By means of modal analysis and stress field analysis, the law of influence of
the structure and elements of cutter on the safety of cutter was acquired, high speed face milling
cutter for machining aluminum alloy was developed. According to ISO15641 international standard,
safety prediction of cutter and experiments were completed. The results indicate that rigidity failure
rotational speed is higher strength failure rotational speed of high speed face milling cutter,
connection strength between cutter body and screw bolt affects directly the safety rotational speed
of cutter. High speed face milling cutter for machining aluminum alloy possesses higher safety and
better dynamic milling performance as cutting speed is less than 2820m/min.
Abstract: A processing method based on wavelet transform for the monitoring signals of grinding
wheel dull is presented. The noise-falling method based on wavelet transform is used to process AE
signals, grinding force signals and the electric current signals of main axis motor produced in grinding
process, and the processing results can be used to identify grinding wheel state. Test result indicates
that the grinding wheel state can be identified exactly by these three kinds of signal characteristics,
and have higher identified precision.
Abstract: The principle of laser peen forming (LPF) is introduced, the loading model of laser shock
wave is established. This paper focuses on applying finite element analyses, instead of a
complicated experimental procedure, to predict the development, magnitude and distribution of
residual stresses induced by laser impacts on a metal plate, and dynamic process of laser continuous
peen forming is realized with the FEM code ABAQUS. Based on the numerical analysis, the laser
processing parameters can be optimized and the deformation contour of metal plate can be analyzed.
The results calculated by the finite element method are correlated well with the available
experimental results. The simulated results also reveal that adjusting the laser energy appropriately
can result in an anticipated shape of plate in LPF process.
Abstract: A novel quantitative shadow testing equipment is presented based on the digital imageprocessing
technique for characterizing local surface deformations on optical surface. Two
magnetic stepping motors control the positions of the knife-edge for cutting the wave-front reflected
back from the aspheric surface separately. At each position of the knife-edge blocking the image on
the focal plane, it is recorded and analyzed by an image-processing set-up behind the knife-edge
under computer control. Based on a group of images recorded, the analysis of local slopes is
performed by picking up characteristics of illumination levels. Further the relationship between the
changes of illumination level and deformations on surface is built on the principle of Fourier Optics.
The results of tests approve that the method is effective on determining the characteristics of two
parabolic surfaces using magnetorheological finishing.
Abstract: The balance precision of grinding wheel is a key technical parameter in ultra-high speed
grinding process. The actual standard for the balance precision of rigid rotor is not fit for the thin
ultra-high speed grinding system well. The unbalance factors affected on the ultra-high speed
grinding wheel and its system were analyzed, and its effects on the machining quality in the process
were also discussed. The theory and select principle of the balance precision for ultra-high speed
grinding wheel system were studied. The test of dynamic performance was performed for the thin
ultra-high speed CBN grinding wheel system whose structure was optimized. The groundwork to
establish the standard of balance precision for thin ultra-high speed grinding system was offered.
Abstract: Multiple clamps are frequently used to serve the purpose of workholding in a fixture. So
multiple clamping forces including their magnitudes, placements and application sequences, greatly
influence contact forces and workpiece machining accuracy. In this paper, the impact of multiple
clamping forces on workpiece location error is formulated analytically for a workpiece-fixture
system. The proposed model takes into account the varying contact forces and friction force during
entire clamping operation. It reveals that the historical accumulation of clamping steps influences
heavily the final distribution of contact forces in the workpiece-fixture system. In addition, based on
effect of contact forces from one step to another on workpiece location, a novel design model is
presented to optimize the multiple clamping forces in order to minimize the workpiece location
errors. Some numerical tests are finally demonstrated to validate the proposed model and approach.
Abstract: For detecting gradual tool wear state on line, the methods of Wavelet Fuzzy Neural
Network, Regression Neural Network and Sample Classification Fuzzy Neural Network by detecting
cutting force, motor power of machine tool and AE signal respectively are presented. Although these
methods are not difficult to come true and processed accurately and rapidly, it is difficult to obtain
comprehensive information of machining and exact value of tool wear when using single method of
intelligent modeling and single signal detecting. For this purpose, fuzzy inference technique is
adopted to fuse the recognized data. Emulation experiment is carried out by using Matlab software
platform and this method is verified to be feasible. Experimental result indicates that by applying
fuzzy data fusion, we can get an exact tool wear forecast rapidly.
Abstract: Static and dynamic characteristic of carbon nanotube is analyzed by molecular dynamic
simulation. Static analysis show that maximum deflection of carbon nanotube appears at 0.033nm
distance from free end of cantilever. When the value of driving voltage is less, the flexibility is
more important, then the stiffness increase with the voltage increasing, and the collapse structure or
hole appear on carbon nanobute. Under low pressure condition, deflection difference on
equi-increase of pressure between no damping and damping simulation is larger than that on high
pressure. The results of forced vibration indicate that system response consist of transient and
steady-state response. With steps of molecular dynamic simulation increasing, transient response
disappears gradually, so system response includes only steady-state response, which is simple
harmonic vibration with the same frequency as excitation force. These results are in accord with the
classical vibration theory. Moreover they will provide theoretic foundation for designing of
Abstract: In order to meet the requirements of high speed turning, modern power operated
jaw-chucks with centrifugal force compensation (CFC) were developed by some chuck producers.
Based on the force and deformation analysis of the clamping system, a new analytic computation
model of dynamic clamping force for modern chuck with CFC was developed, and verified by means
of experimental investigations. The clamping behaviours during high speed turning, such as the loss
of dynamic clamping force, centrifugal force compensation efficiency and clamping force hysteresis
are investigated. Some problems of design and application of modern chuck with CFC are discussed.
The study results provide reliable theoretic and technical supports to reasonably utilize the potential
of modern chucks at higher rotational speed and guarantee a safe high speed turning process.
Abstract: To assure reliable locking and normal deployment of large space-born appendages, a type
of lock-unlock mechanism driven by spring was proposed. The spiral spring was used as a
retraction device to draw the clamp-band back due to its characteristics of storing much more
energy in limited space. Centralized lock-unlock scheme was employed here to light down mass of
the whole mechanism. Reliable retraction of the clamp band and no collision on the surface of
satellite are inspection targets of retraction device. Effect on retraction track by varying the torque
and mass of clamp band was presented in this paper. To some spaceborne flexible arm, simulation
of retraction track was done under specified parameters. The result obtained from simulation reveals
that clamp band can accomplish safely and reliably, and will not produce any spatial waste.