A method for controlling the flow channel size of closed impeller investment casting precision casting

A technology of investment precision casting and closed impeller, which is applied in the direction of casting molds, casting mold components, manufacturing tools, etc., can solve the problems of poor dimensional accuracy, and achieve the goal of ensuring the dimensional accuracy of the flow channel, saving the trial production cycle, and reducing manufacturing costs. Effect

Active Publication Date: 2021-03-05
XIAN SPACE ENGINE CO LTD
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a method for controlling the size of the flow channel of the closed impeller investment casting precision casting, which can effectively solve the poor precision of the flow channel size of the closed impeller investment casting precision casting by controlling the size of the casting flow channel problems, so as to ensure the hydraulic performance indicators of the impeller head, efficiency and other products

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  • A method for controlling the flow channel size of closed impeller investment casting precision casting

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Embodiment 1

[0033] (1) When designing the investment casting mold, set the process correction amount c on the inner wall of the pouring port of the impeller curved cover plate to compensate for the size deviation of the inlet diameter ΦF after pouring is Φ170mm, and the thickness value of the process correction amount c should be controlled In 0.5 ~ 1mm;

[0034] (2) When designing the investment casting mold, set the process correction amount b on the outer surface of the flat cover plate of the impeller near the sprue to compensate for the dimensional deviation of the wheel hub diameter ΦE after pouring is Φ83mm, and the thickness of the process correction amount b The value is calculated according to the formula ΦE×(0.04-δ) / 2, where δ=0.024, ΦE=Φ83, and the thickness value of process correction b=0.66mm;

[0035] (3) When designing the investment casting mold, set the process correction amount a on the flat cover plate 3 of the impeller near the impeller outlet in the circumferential d...

Embodiment 2

[0040] (1) When designing an investment precision casting mold, set the process correction amount c on the inner wall of the pouring port of the impeller curved cover plate to compensate for the size deviation of the inlet diameter ΦF of Φ150mm after pouring, and the thickness value of the process correction amount c should be controlled In 0.5 ~ 1mm;

[0041](2) When designing the investment casting mold, set the process correction amount b on the outer surface of the flat cover plate of the impeller near the sprue to compensate for the dimensional deviation of the hub diameter ΦE of Φ75mm after pouring, and the thickness of the process correction amount b The value is calculated according to the formula ΦE×(0.04-δ) / 2, where δ=0.024, ΦE=Φ75, and the thickness value of the process correction amount b=0.6mm;

[0042] (3) When designing the investment casting mold, the process correction amount a is set on the flat cover plate 3 of the impeller near the impeller outlet in the ci...

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Abstract

The invention relates to the technical field of investment precision casting, and discloses a method for controlling the size of the flow channel of a closed impeller investment precision casting, which includes the following steps: (1) when designing the investment precision casting mold, the curved cover plate of the impeller Set the process correction amount c on the inner wall of the sprue; (2) When designing the investment precision casting mold, set the process correction amount b on the outer surface of the flat cover plate of the impeller near the sprue; (3) Design the investment precision When casting the mold, set the process correction amount a on the flat cover plate of the impeller near the outlet of the impeller; (4) when designing the investment casting mold, pre-amplify the overall size of the impeller; (5) follow the steps (1) , (2), (3), (4) After correcting the size of the closed impeller, process the investment casting mold. The method of the invention effectively solves the problem of poor dimensional accuracy of the flow channel of the closed-type impeller investment precision casting, improves the hydraulic performance index of the product, saves the trial production period of the product, and reduces the manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of investment precision casting, in particular to a method for controlling the flow channel size of a closed impeller investment precision casting. Background technique [0002] The impeller is an important part of products such as water turbines, steam turbines, aero engines, rocket engines, expanders, pumps, fans, compressors, etc. Its function is to pressurize or convert the gas or liquid passing through it. The impeller is usually composed of discs, blades, connectors and other parts, and is divided into open, semi-closed and closed impellers according to their structure. [0003] In fluid machinery, the impeller has an extremely important impact on product performance. For example, the impeller is used in a steam turbine to convert the heat energy of steam into mechanical energy. The performance of the blade shape, strength, vibration, and thermal fatigue resistance determines the working efficiency and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/08B22C9/04B22C9/22
CPCB22C9/04B22C9/082B22C9/22
Inventor 杨欢庆王琳高怀胜纪艳卿吴晓明陈鹏荣
Owner XIAN SPACE ENGINE CO LTD
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