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Auxiliary Forming Method Of Water Pump Castings
- Jun 21, 2017 -

With the continuous improvement of the quality of submersible pumps, the changing market, as well as customers on the use of new requirements of submersible pumps, the use of traditional technology production diving, Water Pump Castings more and more difficult to meet the requirements of the quality of the casting. Submersible Water Water Pump Castings are characterized as follows.

(1) Water Pump Castings wall thickness difference is large, such as impeller and guide shell, the thinnest at only 2 ~ 3mm, the most thicker at 25mm or more.

(2) hot section distribution more, so that the existence of the Water Pump Castings hardness deviation is too large, white mouth is large, poor processing and other shortcomings. As a result of poor casting performance, production is not easy to control, for which we through the test, proposed the use of high-silicon than the cast iron melting method instead of the original traditional process, after more furnace times to verify, fully meet the requirements.

With the development of science and technology and production, the Water Pump Castings molding technology put forward higher requirements, requiring to produce more accurate, better performance, lower cost of casting. In order to meet these requirements, the foundry has introduced a number of new casting forming methods that are significantly different from conventional sand casting in terms of mold material and molding methods, metal fill form and subsequent condensing conditions. These casting methods are significantly different. Known as special casting forming method. A variety of special casting forming method has its own characteristics.

Commonly used special casting forming methods are: investment casting, ceramic casting, gypsum casting, Lost Foam Casting, metal casting, graphite casting, electroslag casting, shell casting, (semi) continuous casting, pressure casting, Casting, differential casting, extrusion casting, centrifugal casting, vacuum casting and electromagnetic casting. This book describes the last seven kinds of special casting forming methods, their common feature is in addition to the role of gravity, the castings are in a certain external force to help the metal liquid filling, solidification forming, collectively referred to as casting external force assisted forming method The At present, the use of such cast forming technology is increasingly widespread, Water Pump Castings production is increasing. Because of its unique advantages, in the production play an increasingly important role.

Compared with the sand casting, special casting forming method has the following advantages.

① casting size is accurate, the surface roughness value is low, closer to the final size of parts, which is easy to achieve less cutting or no cutting.

② Casting internal quality is good, high mechanical properties, casting wall thickness can be thin.

③ reduce the metal consumption and casting scrap rate.

④ simplifies the casting production process (in addition to investment casting outside), easy to achieve the production process of mechanization and automation.

⑤ improve labor conditions, improve labor productivity.

Due to the above advantages, so that the special Water Pump Castings forming method has been increasingly widely used. Some of these methods belong to the advanced process of near net forming. However, each special casting forming method also has some shortcomings, its scope of application also has some limitations.