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1961年我们试制了直径为五米的抛物面反射体,反射面是冲孔的铝板。制造竣工时检验结果,与样板的误差最大为±1毫米。中心部分直径1.5米以内最大误差为±0.5毫米。抛物面骨架为辐射状,全部由铝合金型材铆接而成。为了便于运输,可分成七块。中心部分直径2.6米,外围六块呈扇形,与中心部分依靠定位销来对准,再定度误差不超过0.5毫米。设计时对全部结构作了初步的强度与刚度计算。计算结果表明,对于精度要求较高的抛物面,设计计算时主要是考虑刚度问题。抛物面的制造是在设备简陋的条件下进行的,主要关键是样板、角铝、反射面的制造与装配调整。对影响样板精度的各项因素作了分析,发现某些因素是无关紧要的。样板系用座标仪定点后画出曲线,点与点间隔为5毫米。座标点的计算采用差分法,快速而准确。角铝用伸缩模及压模来成型。反射面是在水泥模上用橡皮锤敲击成型。装配时专门制造了一个装配台,在装配过程中边检验边调修,从生产准备到制成为时约五个月。
In 1961 we made a parabolic reflector with a diameter of five meters, the reflective surface is punched aluminum. The test result at the time of manufacture is completed, with a maximum error of ± 1 mm from the sample. The maximum error within 1.5 meters of the center part is ± 0.5 mm. Parabolic skeleton for the radial, all from the riveted aluminum profiles. For ease of transport, can be divided into seven. The central part of the diameter of 2.6 meters, the outer six fan-shaped, with the central part by positioning pins to align, then the error is not more than 0.5 mm. The design of all structures made a preliminary calculation of strength and stiffness. The calculation results show that for the paraboloid with higher precision, the stiffness is mainly considered in the design calculation. Parabolic manufacturing is carried out under the conditions of crude equipment, the main key is the model, angle aluminum, reflector manufacturing and assembly adjustments. The factors that influence the accuracy of the model are analyzed and it is found that some factors are irrelevant. The model was plotted with a coordinate system and plotted with a point spacing of 5 mm. Coordinate calculation using the difference method, fast and accurate. Angle aluminum telescopic mold and die to form. The reflector is molded on a cement mold with a rubber hammer. Assembly of a specially fabricated assembly station, while the assembly side of the inspection side conditioning, from preparation to production time of about five months.