Integral impeller casting process of narrow-sprue centrifugal pump and impeller mould case
A casting process and integral casting technology, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of low strength of the impeller flow channel formwork, unsatisfactory economic benefits, narrow impeller outlet, etc., achieving significant technological progress, Effect of reducing deformation and damage and improving impeller yield
Active Publication Date: 2014-07-02
ZHEJIANG KEER PUMP
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Problems solved by technology
However, the impeller outlet of small-flow high-lift centrifugal pump is relatively narrow. During its investment casting, the strength of the impeller flow channel mold shell is low, easy to deform, difficult to cast, high scrap rate, and unsatisfactory economic benefits.
Method used
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[0010] refer to figure 1 , figure 2 It can be seen that the integral casting process of the impeller of the narrow channel centrifugal pump applied to the small flow high lift centrifugal pump of the present invention is (by the pouring cap opening 1 of the impeller formwork and the inner pouring channel 2 and exhaust channel 3 with the impeller mold 4 Form an integral process flow step): first, each runner on the front cover plate 41 of the impeller mold 4 (wax mold) is provided with a casting process hole 42 (generally two), and in the initial (several times) During the coating process, the formwork connecting stiffeners are gradually formed; then, pouring molten steel first passes through the pouring channel 2 through the pouring cap opening 1 of the impeller formwork, and then passes through the back cover plate 43 of the impeller mold 4, the blades 44 of the impeller mold 4, Around to the front cover plate 41 (and the surface of the inner mold shell of the impeller mold...
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The invention relates to an integral impeller casting process of a narrow-sprue centrifugal pump. The integral impeller casting process comprises the following steps that casting process holes are formed in each sprue on a front cover plate of an impeller mould; a mould case connected reinforcing rib is gradually formed in the coating process; casting steel passes through a casting passage by a casting opening of the impeller mould case, then successively passes through a rear cover plate, a blade and a front cover plate of the impeller mould and is communicated with atmosphere through an exhaust passage; the mould case connected reinforcing rib formed by the casting process holes enables an outer mould case of the impeller mould case, the front cover plate of the impeller mould and an inner mould case in the sprue to be connected integrally; after casting and cooling, the outer mould case and the inner mould case are knocked off to finally prepare the finished impeller product. The impeller mould case comprises the outer mould case, the inner mould case and the impeller mould, and casting process holes are formed in the front cover plate of the impeller mould. By the integral impeller casting process, the integral strength of the impeller mould case is enhanced, deformation and damage to the impeller mould case by high-temperature steel during casting are reduced, the yield of the impellers is improved, and the production cost is lowered.
Description
technical field [0001] The invention relates to the manufacture of a centrifugal pump, in particular to an impeller casting process of the centrifugal pump and an impeller mold shell adopted therefor. Background technique [0002] At present, the impeller casting of domestic centrifugal pumps adopts sand mold or investment casting method: sand mold casting is generally applied to impellers with relatively large outlets and low surface requirements; investment casting (that is, wax mold casting) is more common Casting method of impeller. However, the impeller outlet of the small-flow high-lift centrifugal pump is relatively narrow. During its investment casting, the strength of the impeller runner mold shell is low, easy to deform, difficult to cast, high scrap rate, and unsatisfactory economic benefits. Contents of the invention [0003] The object of the present invention is to overcome the above disadvantages, and provide an impeller integral casting process and impelle...
Claims
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Login to View More IPC IPC(8): B22C9/28B22C9/08B22C9/04
Inventor 颜金娒夏益洪陈杰李良特倪秀栋
Owner ZHEJIANG KEER PUMP