Our casting production has won nine years ranked first in the world, I am worthy of the world's national plan of casting a big country. But such a casting producing countries, still has to import from overseas casting products. This is not due to the lack of the total cast, but the amount of high-end casting products no way satisfied the requirements of the domestic production. In fact there are more than the number of low-end casting nobody cares. Low-end casting foundry overcapacity, poor product sales line slot port three cable ducts, affecting the company's capital returns casting port cable trough price, then the implementation of the production port cable trough, continue to move the company's impact on the progress of the casting. To promote the progress of the casting industry, the excess should be low-end can often translate into high productivity, with particular attention to the progress of a certain stage of the domestic shortage of high-end features of the device, to the satisfaction of the market, thus enhancing the casting industry progress. For the requirements of the more important or prone to casting port cable slot on the casting process equipment problems, but also the need for non-destructive testing work can be used for quality control of ductile iron NDT techniques include liquid penetrant testing, magnetic particle testing, eddy current testing, radiation detection, Ultrasonic testing and vibration testing. Mold tilt display and alloying, have benefited. Eliminate shrinkage defects casting machine is a complex understanding of the implementation process. Should be "thermal equilibrium" as the basic principles of scientific analysis Ju body casting done, establish a reasonable process plan, move good selection of suitable modeling material, tooling and correct operation and standardization. Then any machine casting shrinkage defects can be resolved. Ports cable channel _ Chen Hua Machinery (certified) _ port cable channel provided by the China Machinery Equipment Co., Ltd. Qingdao Chen. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) is Qingdao, a leader in CNC machine tools over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chen Hua Machinery leadership in the staff warmly welcome all inquiries negotiations to create a better mechanical Chen Hua future.