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巨厂生产的１８型凿岩机，冲击能低，达不到质 量分等标准规定的一等品水平。为了提高产品质量，增强市场竞争能力，欲通过正交试验寻求产品某些零件结构尺寸的较优值，以提高产品性能。 １ 试验目的及考查指标 （１）试验目的 在保证产品零部件能互换的前提下，通过试验，寻求
Ju-18 production of rock drill, impact energy is low, failing to meet the quality standards of the first grade level. In order to improve product quality and enhance market competitiveness, we are trying to find the optimal value of the structural dimensions of some parts of the product through orthogonal test, so as to improve the product performance. A test purpose and test indicators (1) the purpose of the test to ensure that the product components under the premise of interchangeable, through testing, seeking