国外机械图纸(国外英文资料).doc

国外机械图纸(国外英文资料)Since the reform and opening to the outside world, many foreign equipment, drawings and other technical information have been imported in China. Many developed countries have different mechanical projection methods and different projection methods adopted in china. In order to better learn advanced technology in developed countries, it is necessary to quickly understand foreign mechanical drawings. 1 overview in todays world, ISO international standard stipulates that the first and third projection are equally valid. According to the national conditions are different, including Russia, Ukraine, Germany, Romania, Czech, Slovakia and Eastern Europe and other countries are mainly using the first angle projection, and the United States, Japan, France, Britain, Canada, Switzerland, Australia, Holland and Mexico and other countries are mainly used for projection. Before liberation, our country also adopted the third triangle projection. After the founding of new China, the first angle projection was used. The triangular projection is often encountered in imported mechanical drawings and scientific books and periodicals. The ISO international standard specifies the projection marks for the first and third angles (FIGS. 1 and 2). In the title column, there are markers, which can be used to identify drawings, but some drawings do not have a projection mark. Figure 1 the first angle projection notation in Figure 2 the third angle projection notation 2 projection space by plane is V, H, W level side plane divided into eight regions, respectively first, second, third, fourth, fifth, sixth, seventh, eighth angle, as shown in Figure 3 show. Figure 32.1 puts the object in the first angle, and the projection is called the first corner projection, also known as the E method - the European method. 2.2, the object in the third angle projection, known as the third triangle projection, also known as the A method - the United States approach. Our country uses the third tria