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Issue 5 ， 1985
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The Research and Development of Aerodynamic Lubrication in Precision Instruments
Abstract：This paper Reviews the researoh and development of aerodynamic lubrication in precison instruments. The research and application of aerodynamic lubrication in precision instruments were.earest in the application on the region of gas lubrication. Aerodynamic lulication had been successfully used in Gyros and in the first satellite of U.S.A. There are many Successful examples of application in precision instruments recent years. For example in the magnetic drum or magnetic head of large type electronic computor and the laser printer. This paper had deen written in order to promote the application of these advanced teehniques in civil precision instruments of our country. It contains the charactrics of aerodynamic lulrication, the design of allodynamic bearings, the materials of aerodynamic bearings, the precision machining of aeradynamic bearings and the example of actual spiral grooves aerodynamic bearings.- 41
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Published：2020-08-12 -
A Brief of Computer Aided Mechanical Design
Abstract：This paper is the introduction to Computer Aided Mechanical Design which contains Computer Graphics, Plotters and Interactive Graphics System, Simulation of Dynamic System, Kinematic Analysis of Planar Linkages, Synthesis and Analysis of Linkages, and Optimization.The purpose of the paper is to describe, with examples, the background information on CAD.- 46
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Published：2020-08-12 -
Glass Formation and Properties of Glasses in the Systems X2O3 (X=B、Al、Ga)-K20(Zn0)-Nb205
Abstract：Glass forming tendencies and some properties of the systems(B. Al. Ga)2O3-K2O(ZnO)-Nb2O5 have been studied. On the basis of calculating structure parameter, bond parameter, relation between the electronegativity and the ratio of average ion radius, the coordination number of Nb was inferred to be 4 and 6 and Nb2O5 in the system Nb2O5-B2O3-K2O exists as a metaniobate state.- 63
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Published：2020-08-12 -
A Study of the Glass Composition of LaK 747/509
Abstract：In this work we chose B2O3-La2O3-Y2O3-ZrO2 system as the base glass composition. The glass composition of LaK 747/509 which we obtained at last is free of Thorium. Because this glass has a series of good properties such as narrow devitrification range. Slow devitrification speed and high viscosity etc, so it can be melted successfully in 12-30L platinum pot and glass blocks about φ200×25mm with good quality were obtained.- 32
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Published：2020-08-12 -
The Kinematics Mechanism of Continuous Floating Polish Method for Making High Precision Optical Flat
Abstract：In this paper, evolutional process from classical optical processing to continuous polishing method is discussed. We stress on analysing and discussing theory for continuous floating polish method from viewpoint of polishing kinematics and deduces relative formulas. This paper describes preliminarily the method of equal-stroke grinding method and carries out some analyses according to our experiences. In arder to get a precision polishing surbace, the question of getting an optimum polishing state is aiscussed.- 47
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Published：2020-08-12 -
Measurement and A Few Study on Dynamic Load Sharing Condition in A Planetary Gears
Abstract：It is the most desirable for the load sharing on each planet gear to be even and many kinds of considerations are used in a planetary gears. However, we have not suitable method to measure the load sharing condition. Then, it is noticed that the measurement can be accomplished by the method to measure and compare the values of the shearing strains on each shafts of planet gears and the method is cleared to be for practical use by some experiments with the planetary gears for actual use.- 54
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Published：2020-08-12 -
To Realize Complicated Predeterminate Curve of Points on Coupler with Cam Revisory
Abstract：This paper describes one kind of design method about how to realize complicated predeterminate curve of points on coupler with cam revisory, which may be used in synthesis of mechanisms in precision and light machinery.- 27
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Published：2020-08-12 -
Micro Absolute Matrix Encoder
Abstract：The absolute encoder has such advantages as fixed starting-point, reliable reading, and so on. But traditional absolute encoder is limited in use, because of its large number of rings and large size. So micro encoder is desired. This paper introduces design procedures about a micro absolute matrix encoder, including the design of absolute matrix code disk, working principle, procedure of matrix decode. The minimum radial size of traditional absolute encoder of 14 bits is φ130mm. While using matrix code disk, the radial size of same bit encoder can be reduced to φ65mm.- 46
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Published：2020-08-12 -
Temporal Modulation Transfer Function (TMTF) at Cathode-mesh Region of Streak Tube
Abstract：Suppose that Cathode-mesh region of streak tube possesses the even electric field. Time difference of electron transmission at this region can be derived from electron motion equation for single energy distribution of photoelectrons. Then analytical formulas of temporal spread function and TMTF are derived. The analytical formulas of TMTF are obtained one after another for electron energy Maxwell, Cosine and Beta distribution. Finally the formulas of limit temporal resolution Corresponding with depth of modulation of 5% and the curves of TMTF are given.- 46
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Published：2020-08-12
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