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近年来,由於高强度鑄蚨的高速發展,在這個發展過程中產生了球墨鑄鈇。現在國內各廠都已在普遍地制造,而且獲得了很大的成績了;但是在它的生產過程中仍舊存着在缺點,就是質量尚不能穩定,具体表现在发品率高,以致成本无法降低。固然,進一步的控制球墨鑄铁的質量是必需的;然而當鑄铁的强度,如果採用了孕育鑄铁即能达到要求的話,那么还是以採用孕育鑄铁作為材料,比較相宜,因為孕育鑄
In recent years, due to the high-speed development of high-strength cast boring tools, a spheroidal cast burr has been produced in this development process. Now all factories in China have been manufacturing in general, and have achieved great results; but in its production process is still in shortcomings, that is, quality is not yet stable, the specific performance in the high yield, resulting in the cost can not be reduce. Of course, it is necessary to further control the quality of spheroidal graphite cast iron; however, when the strength of cast iron can meet the requirements if bred cast iron is used, the use of bred cast iron as the material is more appropriate because of the gestation