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Precise CRDM part casting forming method

A technology of precision casting and molding method, applied in casting molding equipment, molds, mold components, etc., can solve problems such as restricting the development of nuclear power industry, large consumption, threatening national defense security, etc., and achieve considerable economic and social benefits, parts The effect of high yield and meeting technical requirements

Active Publication Date: 2015-09-02
DONGFANG TURBINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of technology monopoly forces my country to import at a high price (the current price is about 20,000 yuan / set). The connecting rods and claws of the nuclear control rod drive mechanism are not only used in large quantities, but also need to be replaced regularly. This situation seriously restricts my country. The development of the nuclear power industry even threatens my country's national defense security

Method used

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  • Precise CRDM part casting forming method
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  • Precise CRDM part casting forming method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The present invention is the precision casting molding method of CRDM part-claw and connecting rod, and it comprises the following steps:

[0030] 1). According to the design shape of the CRDM hook and connecting rod, the matching ceramic mold shell is manufactured by investment molding.

[0031] Specifically, the ceramic formwork of the present invention is molded on a ceramic pouring system, which includes a sprue cup, a top runner, two straight runners (ie vertical runners) and a bottom runner , all runners are hollow structures.

[0032] Wherein, the sprue cup is formed on the top of the top runner, preferably in the center of the top surface of the top runner. The top runner is a hollow elongated structure, and its outline size should be able to cover the upper end faces of the two sprues without affecting the spatial arrangement of the two sprues.

[0033] Two sprues are arranged at both ends of the top runner, each sprue is a hollow structure, and the hollow of...

Embodiment 2

[0045] The present invention is the precision casting molding method of CRDM part-claw, and it comprises the following steps:

[0046] 1). According to the design shape of the CRDM hook, the matching ceramic mold shell is manufactured by investment molding.

[0047] Specifically, the ceramic formwork of the present invention is molded on a ceramic gating system, which includes a sprue cup, a top runner and two sprues, all of which are hollow.

[0048] Wherein, the sprue cup is formed on the top of the top runner, preferably in the center of the top surface of the top runner. The top runner is a hollow elongated structure, and its outline size should be able to cover the upper end faces of the two sprues without affecting the spatial arrangement of the two sprues.

[0049] Two sprues are arranged at both ends of the top runner, each sprue is a hollow structure, and the hollow of the sprue communicates with the hollow of the top runner. On each sprue, there are multiple claw f...

Embodiment 3

[0060] The present invention is the precision casting molding method of CRDM part-connecting rod, comprises the following steps:

[0061] 1). According to the design shape of the CRDM connecting rod, the matching ceramic mold shell is manufactured by investment molding.

[0062] Specifically, the ceramic formwork of the present invention is molded on a ceramic gating system, and the gating system includes a sprue cup and a sprue, and the sprue is a hollow structure.

[0063] Wherein, the sprue cup is formed on the top of the sprue, and the two are axially arranged and formed.

[0064] The hollow of the sprue communicates with the hollow of the sprue cup. A plurality of connecting rod formworks are arranged radially on the sprue, and these connecting rod formworks are preferably arranged in a grouped rectangular array, so that the formworks can be arranged neatly, efficiently and compactly, each of the aforementioned formworks It cannot be directly installed on the sprue, oth...

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Abstract

The invention discloses a precise CRDM part casting forming method. The precise CRDM part casting forming method comprises the steps that 1, a ceramic mold shell matched with design shape is manufactured in an investment mode according to the design shape of a CRDM claw and / or a connecting rod; 2, the ceramic mold shell is preheated under the condition of the temperature ranging from 850 DEG C to 1100 DEG C, the temperature is kept for 1-5 hours, and temperature uniformity of all positions of the ceramic mold shell is ensured; a stellite ingot is molten under the condition of the temperature ranging from 1400 DEG C to 1500 DEG C and is cast into the well-preheated ceramic mold shell, and a casting is formed after solidification; 3, mold shell is cleaned, and the casting is subjected to heat preservation under the condition of the temperature ranging from 850 DEG C to 950 DEG C and then is subjected to air cooling for 610 hours. The forming of the connecting rod and / or the claw part for a CRDM is reliably achieved by means of an investment casting technology, forming operation is easy, finished product rate is high, and a formed connecting rod and / or the claw part has even texture, is long-acting and abrasion-resistant, is reliable and stable in use and can effectively meet the technological requirements.

Description

Technical field [0001] The invention involves precision casting technology, which is specifically a method of precision casting of CRDM parts. Background technique [0002] CRDM is the abbreviation of the nuclear control rod driver. It is a servo institution of the nuclear power plant reactor control system and the security protection system. It has the effect of completing the reactor startup, regulating reactor power, stopping reactor and accidental stopping.Key equipment for the safe and reliable operation of nuclear reactors. [0003] For a long time, the molding technology of the nuclear control stick drive mechanism has been monopolized by the world's strong powers and strong enterprises, which includes the connecting rod and claw molding technology in the coil group of the nuclear control stick drive mechanism.This technical monopoly forces my country to import a high price (the current price is about 20,000 yuan / set) import. The connecting rods and claws of the nuclear co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/22B22C9/08
Inventor 刘艳领杨功显张建平李海松张琼元巩秀芳贺群功杨明赵代银
Owner DONGFANG TURBINE CO LTD
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