Microstructure is not as a basis for acceptance, but the
cnc machine casting production enterprises, must be controlled as the most important item. Casting Machine because of the strength and the ability to maintain dimensional accuracy, rigidity, wear resistance and cutting performance has high demands, and the gray iron there must be a good performance of these organizations to ensure that the microstructure, and good microstructure, Through strict control to ensure that the process, such as strict management of the charge, a reasonable charge ratio, the best melting control, a serious inoculation and appropriate pouring temperature, one can not do. Microstructure out of control, show that the majority of China's machine tool enterprises in the casting process control is not strict, and it is very arbitrary. We visited some of the main
cnc machine casting enterprises, most enterprises have metallographic inspection means, but it was not serious analysis of the examination results And analysis of the results reflected in the process control system. Some plants after a brief inspection in a written record of the conclusions, some in the form filled out a conclusion to the quality inspection departments, as the bureaucratic muddle through. We have to a plant, see a recent quality inspection report, simply write a "form of graphite type A" and out of the sample under a microscope to observe that the sample of A-type graphite only 43 per cent, while test Said: "As long as one of type A, we write A-type." This inspection is more terrible than useless, is actually self-comfort, self-deception. Some plants are simply cancel the microstructure of the test. Only serious test of individual plants microstructure, and maintain high-quality products. Not a corporate control of the elastic modulus of cast iron gray iron modulus of elasticity is the impact of cast iron rigidity and dimensional stability of the important performance indicators, speaking on cnc machine casting is particularly important. Impact of gray iron modulus of elasticity is the main factor in the form of graphite, and its length in iron levels in the percentage of the volume. Therefore, the strengthening of inoculation, control of the microstructure is to improve the elastic modulus of the key. Production abroad
cnc machine castings, will be elastic modulus as a major-controlled items, because of its strict control of the process, better quality metallurgical, gray iron Modulus of the indicators is quite high.