The paper proposes a method to measure vibration amplitude of ultrasonic horn which is a very important component in the spindle for micro-electrical-chemical discharging machining. The method of image measuring amplitude on high frequency vibration is introduced. Non-contact measurement system based on vision technology is constructed. High precision location algorithm on image centroid, quadratic location algorithm, is presented to find the center of little light spot. Measurement experiments have been done to show the effect of image measurement technique on vibration amplitude of ultrasonic horn. In the experiments, precise calibration of the vision system is implemented using a normal graticule to obtain the scale factor between image pixel and real distance. The vibration amplitude of ultrasonic horn is changed by modifying the voltage amplitude of pulse power supply. The image of feature on ultrasonic horn is captured and image processing is carried out. The vibration amplitudes are got at different voltages.
There is micro discharging gap to be measured between negative electrode and positive electrode in precise micro
electrical discharging machining. The state of the discharging gap is complex and variable. There are many factors which
have effects on the state. Furthermore, practical application wants rapid measurement to meet the satisfaction of pulse
response. Normal measurement method is not suitable to obtain the information of the micro gap. The paper introduces
an important relationship between the voltage of discharging pulse and the size of discharging gap. Then, several typical
measurement methods and their interrelated basic circuits are presented, such as gap average voltage measurement
method, gap peak voltage measurement method and electrical discharging sensing method, etc. The measurement
circuits are designed correspondingly. Pulse response test under different conditions are carried out. Results show that
the measurement circuits can detect the variance of gap size respectively and rapidly. The measurement methods are
effective.
The paper introduces the basic principle of a kind of constant voltage power supply. A output circuit and a sampling
feedback circuit are included in the power supply. There is a big problem between the two circuits, which is obvious
nonlinearity error. Some simulation test is done in order to reduce the nonlinearity error. Two methods are presented
according to the simulation result. One method is to add a self-adjusting circuit in the sampling feedback circuit, which
can reduce the nonlinearity error through hardware. The other method is to add a special program in the soft so that the
control signal is adjusted to be nonlinear according to the feedback signal, which can reduce the nonlinearity error
through soft. The adjusting process is done repeatedly. The experiments show that the output of the constant voltage
power supply ranges from 25 volts to 150 volts. Its error is reduced from original 43 volts to 0.6 volt and its hysteresis is
improved greatly.
Two integrating sphere system using the substitution method have been built to measure the reflectivity of 30CrMnSiA
irradiated by Nd:YAG continuous wave laser with a wavelength of 1064nm.It can prevent the fluctuation of laser output
energy. The back surface temperature was recorded using NiCr-NiAl thermocouples. Surface oxide film composition and
thickness were studied by XPS and XRD. A one-dimensional heat conduction model implementing a parabolic oxide
growth law was developed to obtain the temperature-dependent reflectivity. The computational and experimental results
are well accordant with each other.
More and more precise parts are being required in modern domains of scientific research and manufacturing industry, which urges the corresponding measuring technologies to ameliorate and innovate, especially in micro-nanometer scale. The paper gives a detailed introduction about the optics interferometry and digital image processing technology respectively. Then, a 3D reconstruction method based on interferometry and image processing is described in the paper to solve surface measuring problem of a kind of planar part. The method can show the microcosmic surface of the part distinctly. At the same time, some parameters of the part can be calculated to reflect the manufacturing quality. According to these parameters, the conclusion on whether the part is qualified or not can be made, some another conclusion on how to modify the part for better result can also be determined. At last, some experiments have been done to verify the effect of the method. The method is simple, convenient and practical. Its measurement capability is between atomic force microscope and coordinate measurement machine.
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