一、精密加工与超精密加工精密加工和超精密加工已成为在国际竞争中取得成功的关键技术,它是现代制造技术的前沿,也是明天技术的基础。现代机械工业之所以要致力于提高加工精度,其主要原因在于提高产品的性能和质量,提高其质量稳定性与性能可靠性,促进产品的小型化, First, precision machining and ultra-precision machining Precision machining and ultra-precision machining has become the key to success in international competition, it is the forefront of modern manufacturing technology, but also the basis for tomorrow’s technology. The reason why the modern machinery industry is committed to improving the processing accuracy, the main reason is to improve product performance and quality, improve its quality and reliability, promote product miniaturization,