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在进口钢材的法定检验工作中,我们遇到有些国外钢材标准中规定,试样在进行正向冷弯曲试验后还要进行反向冷弯曲试验。例如,英国和联邦德国对热轧钢筋都有这样的要求,国内有的用户在使用过程中因出现过这方面的事故,也曾进行过反向冷弯曲试验。我国现行生产的材料试验机的附件——冷弯装置,只能进行正向弯曲试验而不能进行反向弯曲试验,因此,有必要设计一种能进行反向弯曲试验的装置。
In the statutory inspection of imported steel, we have encountered some foreign steel standards, the sample after the test in the forward cold bending but also reverse cold bending test. For example, the United Kingdom and the Federal Republic of Germany have such requirements for hot rolled steel bars. Some domestic users have also conducted reverse cold bending tests in the course of their use in the event of such accidents. China’s current production of materials testing machine accessories - cold bending device, only the forward bending test can not be carried out reverse bending test, therefore, it is necessary to design a reverse bending test device.