Abstract: In some remote sensing, such as meteorology and oceanography, wide swath scanning must
be used. Owing to the limitation of the detector size, especially in infrared spectrum, the
optical-mechanical scanning mode is necessary. Scanning efficiency is an important parameter of
those scanners. The high scanning efficiency is one of the goals followed after by the designer of
remote sensor. Two high efficient scanning systems are developed by authors. Those systems can
have some advantages, such as simple and reliable.
Abstract: According to revised Cailikefu’s rolling shear force formula, motion path equation of
spatial seven-bar path is built, and mechanical model, with such new structural features as asymmetric
and negative offset, is thus successfully established for 2800 mm heavy shear of some Iron&Steel
Company. Shear force and bar force of steel plate, before and after adoption of asymmetric and
negative offset structure, are analyzed, as well as horizontal force component of mechanism that
influences pure rolling shear and back-wall push force that keeps blade clearance. The discovery is
that back-wall push force could be kept large enough at rolling start-up (i.e. the time that the
maximum rolling shear produces), meanwhile, back-wall push force is the most approximate to side
forces with adoption of 60mm~100mm offset. Theoretical results and on-site shear quality both
indicate that new structural features such as asymmetric and negative offset plays an important role in
ensuring pure rolling shear and keeping blade clearance constant, which provide an effective means to
improve quality of steel plate.
Abstract: Currently, most of the diamond turning tools used for precision machining are still
manually manufactured, the profile accuracy of the diamond cutting edge depends on the operator’s
experience and skill, so that the process need to be automated. Therefore in this research, an
automated grinding system has been developed for the diamond turning tools, controlled by a vision
system. The profile of the diamond turning tools is captured in real time via CCD camera. The
deviation from an ideal circle is calculated and feedback to the controller, the grinding system then
removes cutting edge of turning tool selectively to achieve high quality and high productivity.
Abstract: Under optimization deposition parameters, such as the acetone concentration, reactive
pressure, the bias power, diamond films was deposited on cemented carbide tools with two-step
pretreatment method under different distances between the substrates and hot filaments, and the
study on the effect of the distance between the substrates and hot filaments on the crystallographic
orientation of diamond films and the characteristics of diamond coated tools were investigated in
bias-enhanced HFCVD system in this paper. The cutting performance of diamond coated tools was
verified by the experiments of cutting particles reinforced aluminum base composite material with
15 vol.% Si as compared with uncoated ones. The quality of diamond film was analyzed by means
of SEM, Raman spectrum, and X-ray diffraction. The optimization deposition processing was
obtained. The relative intensity ratio of (111) facet and (220) facet in the film tested by XRD was
one third. The cutting performance of diamond coated tool was improved significantly when
machining the Si particle reinforced aluminum-based metal matrix composite; its lifetime was as 30
times long as that of uncoated one. The work of this paper was of great practical significance to
accelerate the industrialization of diamond films coated WC–Co substrates.
Abstract: The performance and stability of output of electrical discharge machining (EDM) are
determined by the output of EDM pulse power supply. In order to resolve disadvantages of
conventional pulse power supply, such as undesirable efficiency and low power factor, the prototype
design of energy-saving EDM pulse power supply is developed. It is composed of such three stages as
a single-phase active power factor correction (PFC) pre-regulator, a full-bridge phase shift zero
voltage switching (FB-PS-ZVS) converter based on complex control paralleled of machining current
closed-loop and voltage closed-loop at period of spark gap insulation, and a pulse generator based on
machining sequence control. The PFC pre-regulator contributes to a great increase to about 0.95 in its
power factor. The efficiency of the new system is considerably increased to about 70% due to design
of ZVS. The pulse generator contributes to the pulse machining current without a tail. Experiment
results demonstrates that the prototype is capable of low electrode wear, high speed, stable machining.
Abstract: A new 5-degrees-of-freedom hybrid kinematic machine(HKM) consisting of a
4-degrees-of-freedom PTS-based parallel kinematics platform with center constraint branch and a
serial X axis is developed. The will-be-machined workpiece is mounted on the platform and the
spindle movement is driven by the X axis. This new HKM is very different from a conventional
serial-type machine. Therefore, a special algorithm that can transfer the cutter location data
(CL-data) into machine specific NC commands is essential for the applications of the PTS-X based
HKM in real machining of the workpiece with the complicated surface. The workpiece’s location
approach on the platform and the orientation transformation of the moving platform relative to the
machine coordination system are investigated.
Abstract: During weaving tufting carpet, the improper stop position of tufting machine will result
in stop mark, which influences the carpet quality. In this thesis, through theory analysis and
experiment research, the influence rule on the stop position of tufting machine to loop yarn tension
and to loop-height has been obtained, and a method of eliminating stop mark by stopping machine
in high has been put forward. The technology experiment has proved that when it overlaps partly
with high position signal, a fixed position of stopping tufting machine in high has been realized by
sending out stop instruction and stopping the tufting machine by a brake cylinder, and the best result
of eliminating stop mark has achieved.
Abstract: Because of the fierce competition among manufacturers and customers’ diverse needs, it
is essential for manufacturers to organize virtual organization to enhance their agilities to the market.
However, the job-shop scheduling becomes very complex and very difficult in a temporary virtual
organization. To achieve a harmonious collaborative engineering environment, a framework of
agent-based collaborative job-shop scheduling is proposed and resource conflicts are discussed, and
the theory of rough set and fuzzy appraise are applied to mediate these conflicts.