Casting quality test results are usually divided into three categories: quality products, rework, scrap. Qualified product quality and the appearance of the intrinsic quality meets the standards or technical conditions of delivery and acceptance of casting; rework the appearance of quality and inherent quality does not fully comply with the standards and acceptance criteria, but allows repair after repair and castings up to standard delivery acceptance of technical conditions require casting; waste refers to the appearance of quality and inherent quality marina facilities are substandard, still can not reach the standards and technical conditions of delivery and acceptance of casting casting allowed to repair or rework later. Waste and scrap again divided into two kinds of foreign waste. Waste means within the factory or in the casting foundry castings found in waste; waste refers to the outer casting scrap discovered after delivery, they have caused economic losses than in the big waste. Casting is an ancient method of manufacturing a terminal equipment manufacturers in the country can be traced back to 6,000 years ago. With the development of industrial technology, quality casting large castings directly affects the quality of dock equipment products, therefore, plays an important role in casting machinery manufacturing industry. Casting technology development is also very quick bucket wheel guard dock equipment, especially the late 19th century and the first half of the 20th century, there have been many new casting methods, such as low-pressure casting, ceramic casting, continuous casting, etc., in the second half of the 20th century improved and practical. Shandong dock equipment, dock equipment, Chen Hua Chen machinery provided by the China Machinery Equipment Co., Ltd. Qingdao. Qingdao Hua Chen Machinery Co., Ltd. (www.qdchenhua.com) strong, credible, in Qingdao, Shandong CNC machine tool industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chen Hua machinery and you hand into the brilliant, for a better future!