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Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting

A technology for fastening parts and insulators, applied in insulators, electrical components, suspension/strain insulators, etc., to solve problems such as poor tensile strength and mechanical properties

Inactive Publication Date: 2013-05-08
SEDIVER SOC EURO DISOLATEURS & VERRE & COMPOSITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are ductile cast irons with good impact strength values ​​at -40°C, it is generally found that the mechanical properties of these grades in terms of tensile strength are inferior to those of conventional cast irons

Method used

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  • Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting
  • Process for manufacturing a casting made of ductile cast iron for a high-voltage insulator fitting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] exist figure 1 Among them, the capped pin-shaped high-voltage insulator comprises an insulating part 1 made of glass, on which a cap 2 cast in cast iron is fastened on the upper part and a needle 3 is fastened on the lower part.

[0018] The cap 2 is obtained by casting ductile cast iron with a controlled chemical composition.

[0019] The chemical elements normally present in ductile cast iron affect its tensile strength properties and its low temperature impact strength properties according to their proportions in the composition. Silicon is an element that is most important both for the tensile strength and the transition temperature from the ductile state to the brittle state. Manganese and phosphorus affect cold toughness (ténacité).

[0020] According to the invention, the ductile cast iron used for the manufacture of the insulator cap is a cast iron whose composition is such that the cast contains the following chemical composition in the proportions: 3.2%-3.7%...

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PUM

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Abstract

The process for manufacturing a casting for a high-voltage insulator fitting, by casting a ductile cast iron that contains proportionally between 3.2% and 3.7% carbon, between 1.9% and 2.5% silicon, between 0.1% and 0.5% manganese and between 0.04% and 0.08% phosphorus, comprises the following steps: the casting is cast with a greater than 85% degree of nodularization in a mould; and, after removal from the mould, the casting undergoes a two-step ferritization heat treatment whereby the casting is heated at a temperature of between 850 DEG C and 990 DEG C for a time of between 1 and 5 hours and then cooled to a temperature of between 700 DEG C and 800 DEG C for a time of between 2 and 6 hours.

Description

technical field [0001] The invention relates to the field of high voltage electrical insulators intended for fastening, holding or supporting bare or insulated electrical conductors. Background technique [0002] Such electrical insulators can be made of glass, ceramic or composite composite materials based on silicone, EPDM or any other insulating material such as resin (epoxy, etc.) or epoxy-concrete mixtures. [0003] For example, a capped pin insulator comprises two fastening components, more particularly a cap and a pin respectively secured to two opposing faces of an electrically insulating glass. This coupelle is shaped with fins that extend the creepage distance, ie the distance between the two poles of the glass insulator. The caps of this type of insulator are usually obtained by casting of ductile cast iron. The needle of this insulator is used to hook in the cap of another insulator to obtain a chain of insulators. [0004] Ceramic insulators are usually in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B17/00C21D5/00C22C37/04C22C37/10C04B35/573
CPCC21D5/00H01B17/08C22C37/04C22C37/10C21D2211/005C22C33/08
Inventor F·多万
Owner SEDIVER SOC EURO DISOLATEURS & VERRE & COMPOSITE
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