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The Study on Tracking and Measuring Non-circular Gear of Polar Coordinates

Author: LiuHaiJun
Tutor: GuoJingBin
School: Tianjin University
Course: Measuring Technology and Instruments
Keywords: Non - circular gear Tracking and measuring DSP FPGA Zero tracking
CLC: TG86
Type: Master's thesis
Year: 2010
Downloads: 53
Quote: 1
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Abstract


Noncircular gear pitch curve is more than a function of the required transmission design, it combines the advantages of both cam and gear, but also to achieve accurate and efficient transmission gear both cam variable transmission. Therefore the the noncircular gear in the machine tool industry, light industry automatic mechanical the middle variable transmission than the equipment manufacturing industry occasions has a very extensive application. Their geometric precision, such as the shape of the error detection process error analysis, the domestic little research. The measurement method for non-circular gear commonly used single-sided of engagement and double-sided engagement law, which the single flank law needs standard high-precision cylindrical gear, high-precision cylindrical gear processing difficulties, in addition to its complex structure. Double Flank method can only measure the radial error, it is difficult to accurately reflect the entire gear error. In this paper, the polar coordinate measurement principle as the theoretical basis for using polar coordinates tracking and measuring technology, design a DSP (digital signal processor) and FPGA (field-programmable gate array devices)-based data acquisition and control system, can be non-circular gear tooth profile for continuous automatic tracking measurements, in order to achieve the measurement and assessment of the non-circular gear error. Of this study include: 1. Proposed the noncircular gear polar coordinate tracking measurement methods. Continuous rotary control gear, constantly scanning probe measured gear tooth profile deviation, pitch deviation, Cumulative Pitch deviation. A special case of the non-circular gear - the eccentric circle gear polar coordinate tracking measurement of deviation obtained to analyze the characteristics of the eccentric circle gear tooth profile. Proposed the idea of ??imaginary oval gear tooth, the theoretical imaginary toothed toothed tracking measurement. Calculated on the basis to solve the problem of interference of the probe with tooth profile to imaginary toothed sampling points of law to the error analysis of the the oval gear tooth variation. The proposed arc length ranging corner processing method, to calculate the non-circular gear tooth pitch deviation. 4. \5. Designed DSP and FPGA-based non-circular gear polar coordinate measurement and control systems, including servo motor control circuit, the the grating signal acquisition circuit, AD converter circuits, data communications and protection circuits. Time principle to complete the production of PCB board, circuit debugging hardware and software programming, using two-axis tracking measurement of non-circular gear.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Tolerance techniques to measure and mechanical measuring instruments > Gear measuring its meter
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