CN103894553A

CN103894553A - Integral impeller casting process of narrow-sprue centrifugal pump and impeller mould case

Info

Publication number: CN103894553A
Application number: CN201410071748.0A
Authority: CN
Inventors: 颜金娒; 夏益洪; 陈杰; 李良特; 倪秀栋
Original assignee: ZHEJIANG KE'ER PUMP SHARE CO Ltd
Current assignee: ZHEJIANG KE'ER PUMP SHARE CO Ltd
Priority date: 2014-02-28
Filing date: 2014-02-28
Publication date: 2014-07-02
Anticipated expiration: 2034-02-28
Also published as: CN103894553B

Abstract

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

The impeller integral casting process of narrow runner centrifugal pump and impeller formwork thereof

Technical field

The present invention relates to a kind of manufacture of centrifugal pump, specifically relate to a kind of impeller casting technique of centrifugal pump and the impeller formwork of employing thereof.

Background technology

At present, the casting of the impeller of Centrifugal Pumps in China adopts sand mo(u)ld or model casting mode: sand casting is to be generally applied to the impeller that outlet is larger, surface requirements is not high; Model casting (being lost wax casting) is to adopt commonplace impeller casting method.But the impeller outlet of low-flow high-lift centrifugal pump is narrow, in the time of its model casting, impeller channel form strength is lower, easily distortion, and casting difficulty is large, and percent defective is high, and economic benefit is undesirable.

Summary of the invention

The object of the invention is to overcome above-mentioned deficiency, can improve the intensity of impeller channel formwork and make it be difficult to impeller integral casting process and the impeller formwork thereof of the narrow runner centrifugal pump of distortion and provide a kind of.

Object of the present invention realizes by following technical solution: the impeller integral casting process of narrow runner centrifugal pump: first, each runner on the front shroud of impeller mold is provided with casting technique hole, in initial coating process, progressively forms formwork connection strengthening rib; Then, pour steel is first passed through cast passage by the cap pouring port of impeller formwork, again successively by the back shroud of impeller mold, by the blade of impeller mold, around to the front shroud of impeller mold, communicated with atmosphere by exhaust passage and form an overall technical process for casting step, the formwork connection strengthening rib being formed by the casting technique hole on this front shroud makes the interior formwork in front shroud and the runner thereof of outer formwork, impeller mold of impeller formwork be linked to be entirety; Wait cast cooling after, knock out outer formwork, interior formwork, finally make impeller finished product, now described formwork connection strengthening rib Lock-out, described casting technique hole are by electric welding repair welding.

The impeller formwork adopting according to the impeller integral casting process of described narrow runner centrifugal pump, comprise outer formwork, interior formwork, impeller mold, in this outer formwork, there is cap pouring port, cast passage and exhaust passage, on the front shroud of described impeller mold, there is casting technique hole.

Adopt after the present invention, because interior formwork, outer formwork inside and outside front shroud and the runner of impeller mold are linked to be entirety, increase the bulk strength of impeller formwork, reduce distortion and the damage of high-temperature molten steel to impeller formwork in casting process, improve impeller yield rate, reduced production cost, economic benefit is obvious, has significant technological progress.

Brief description of the drawings

Below in conjunction with accompanying drawing and embodiment, the present invention is described further.

Fig. 1 is the process schematic representation of impeller formwork of the present invention and lost wax casting impeller.

Fig. 2 is the top view of impeller mold in Fig. 1 (wax-pattern).

Detailed description of the invention

Known with reference to Fig. 1, Fig. 2, the present invention be applied to low-flow high-lift centrifugal pump narrow runner centrifugal pump impeller integral casting process for (by the cap pouring port 1 of impeller formwork with form an overall process flow steps in interior cast passage 2 and exhaust passage 3 with impeller mold 4): first, each runner on the front shroud 41 of impeller mold 4 (wax-pattern) is provided with casting technique hole 42 (being generally two), in the coating process of initial (several times), progressively forms formwork connection strengthening rib, then, pour steel is first passed through cast passage 2 by the cap pouring port 1 of impeller formwork, again successively by the back shroud 43 of impeller mold 4, by the blade 44 of impeller mold 4, around front shroud 41 (and the surface of interior formwork to impeller mold 4, as shown in the arrow in Fig. 1 flows to), communicated with atmosphere by exhaust passage 3 and form an overall technical process for casting step, the formwork connection strengthening rib being formed by the casting technique hole on this front shroud 41 makes the outer formwork 5 of impeller formwork, interior formwork 6 in front shroud 41 and the runner thereof of impeller mold is linked to be entirety (one), wait cast cooling after, knock out outer formwork, interior formwork, finally make impeller finished product, now described formwork connection strengthening rib Lock-out, described casting technique hole are by electric welding repair welding (becoming impeller part of the whole).

Wherein, the casting technique hole 42 of impeller mold is on the front shroud 41 between every two blades 44, it is conducive to form formwork connection strengthening rib in lost wax casting shell process processed, and this formwork connection strengthening rib is positioned on the front shroud of the impeller mold before exhaust passage 3 and outer formwork, the formwork of the company's of passing through impeller formwork.

Known with reference to Fig. 1, Fig. 2, the present invention is applied to the impeller formwork that the impeller integral casting process of the narrow runner centrifugal pump of low-flow high-lift centrifugal pump adopts, comprise outer formwork 5, interior formwork 6, impeller mold (wax-pattern) 4, in this outer formwork 5, there is cap pouring port 1 (on top), cast passage 2 (at middle part) and exhaust passage 3 (in bottom, communicate with the air outside outer formwork), on the front shroud 41 of described impeller mold 4, there is casting technique hole 42.

Wherein: described cap pouring port 1, cast passage 2 and exhaust passage 3 form impeller casting cap pouring port, and cast passage 2, exhaust passage 3 communicate with impeller mold 4; Described impeller mold 4 comprises front shroud 41, back shroud 43, blade 44.

Claims

1. the impeller integral casting process of narrow runner centrifugal pump, is characterized in that: first, the each runner on the front shroud of impeller mold is provided with casting technique hole, in initial coating process, progressively forms formwork connection strengthening rib; Then, pour steel is first passed through cast passage by the cap pouring port of impeller formwork, again successively by the back shroud of impeller mold, by the blade of impeller mold, around to the front shroud of impeller mold, communicated with atmosphere by exhaust passage and form an overall technical process for casting step, the formwork connection strengthening rib being formed by the casting technique hole on this front shroud makes the interior formwork in front shroud and the runner thereof of outer formwork, impeller mold of impeller formwork be linked to be entirety; Wait cast cooling after, knock out outer formwork, interior formwork, finally make impeller finished product, now described formwork connection strengthening rib Lock-out, described casting technique hole are by electric welding repair welding.

2. the impeller formwork that the impeller integral casting process of narrow runner centrifugal pump according to claim 1 adopts, comprise outer formwork (5), interior formwork (6), impeller mold (4), in this outer formwork (5), there is cap pouring port (1), cast passage (2) and exhaust passage (3), it is characterized in that: on the front shroud (41) of described impeller mold (4), there is casting technique hole (42).