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我所使用的WI-100型液压式万能材料试验机,系上海试验机厂1973年制造。实践证明,该机弯曲试验支座存在着以下缺陷:(1) 对材料作180°弯曲不能一次自动成型。(2)两弯曲支座跨距固定螺栓强度低。(3)支座跨距调节系手动,费时费力。为提高该机使用性能,我们对它的弯曲支座作了以下改进。一 180°弯曲一次自动成型装置设计由于WI-100型液压试验机不具备180°弯曲一次自动成型装置,所以,无论是钢板还是型材,作180°弯曲试验时都必须分三次进行。首先将试样弯曲到120°左右,然后停机取下试样再两次变形压至180°(见图1)。不难看出,三次成型,不但费时费工、成形不准(不可能准确地弯至180°即标准“U”形),而且还因第二、三次变形时弯心及试样无法固定(一般用手托持)可突然高速飞出击伤试验人员。为克服上述缺陷,力学室刘从楷同志于1980年在原支座上增加一偏转
WI-100 hydraulic universal testing machine I used was made by Shanghai Testing Machine Factory in 1973. Practice has proved that the machine bending test bearing the following shortcomings: (1) 180 ° bending of the material can not be an automatic molding. (2) two curved support spanning low strength bolts. (3) Support span adjustment manual, time-consuming and laborious. To improve the aircraft performance, we made the following improvements to its bending support. A 180 ° bending automatic molding device design Because the WI-100 hydraulic testing machine does not have a 180 ° bending automatic molding device, so whether the steel or the profile, for 180 ° bending test must be divided into three times. First, the sample is bent to about 120 °, then stop the sample and then deform twice to 180 ° (see Figure 1). It is not difficult to see that the three forming process not only takes time and labor, but also does not allow for forming (it is impossible to accurately bend to 180 ° or “U” shape), but also because of the second and third deformations, the bending and the specimen can not be fixed (Usually hand care) can suddenly fly out of the wounded test personnel. In order to overcome the above defects, Comrade Liu Congkai of Mechanics Department added a deflection on the original bearing in 1980