在粉末冶金制品的实际生产中,有不少超出标准规定的超薄壁衬套。这种产品由于其壁很薄,在制造、运输、保管过程中容易变成椭圆形,但在装入衬套座后变形又得到纠正并能满足使用要求,从而证明它是尺寸合格的合格品。但是这种产品由于其椭圆度太大,按一般标准检验很难认为其尺寸合格。因此建议参照GB307.1-84《滚动轴承公差》、GB307.2-84《滚动轴承公差的测量方法》中对滚动 In the actual production of powder metallurgy products, there are many ultra-thin wall bushings that exceed the standard requirements. Because of its thin wall, this product easily becomes oval during manufacture, transportation and storage. However, the deformation after deformation into the liner seat has been corrected to meet the requirements of use, proving that it is a qualified product . However, due to its ovality of this product is too large, according to the general standard test hard to consider the size of qualified. Therefore, it is recommended to refer to GB307.1-84 “Rolling Bearing Tolerance”, GB307.2-84 “Rolling Bearing Tolerance Measurement Method”