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Every type of shot sleeve can be subject to refurbishing. Processing is always completed with thermal nitriding treatment. There are three possible overhaul modes:
  • internal diameter increase;
  • pouring area partial bush insertion;
  • complete bush insertion.

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Brondolin carries out overhauling of any type of gooseneck. The procedure comprises the following phases:
  • cleaning in an acid bath, to remove all zinc residues present after extraction from the furnace;
  • extraction of existing sleeve (the part of the gooseneck subject to wear and tear);
  • control and/or refurbishing of the nozzle cone housings;
  • control and cleaning of the feed channel;
  • grinding of the housing and insertion of the new sleeve.

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The refurbishing, which can be carried out on all types of gooseneck, involves the following operations:
  • cleaning in an acid bath to remove magne sium residues present after extraction from the furnace;
  • new diameter lapping for the plunger housing;
  • control and refurbishing of the nozzle cone housing;
  • control and cleaning of the feed channel;
  • final nitriding thermal treatment, on request.

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