Talk:Core plug

From Wikipedia, the free encyclopedia
Jump to: navigation, search
WikiProject Metalworking (Rated Start-class, Low-importance)
WikiProject icon This article is within the scope of WikiProject Metalworking, a collaborative effort to improve the coverage of Metalworking on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
Start-Class article Start  This article has been rated as Start-Class on the project's quality scale.
 Low  This article has been rated as Low-importance on the project's importance scale.
WikiProject Automobiles (Rated Stub-class)
WikiProject icon This article is within the scope of WikiProject Automobiles, a collaborative effort to improve the coverage of automobiles on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
Stub-Class article Stub  This article has been rated as Stub-Class on the project's quality scale.
 ???  This article has not yet received a rating on the project's importance scale.

Proposed merge from Freeze plug[edit]

The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section. A summary of the conclusions reached follows.
The result was merge. Wizard191 (talk) 16:04, 5 August 2009 (UTC)

Almost all of the content at freeze plug is the same as the content here, at core plug. Seeing how they are discussing the same topic they should be merged. Wizard191 (talk) 17:12, 18 January 2009 (UTC)

They're two different things, one of which one is often mistaken for the other, and I dispute the claim "almost all the content" is the same. There's some small overlap in the Freeze Plug article that could easily be trimmed down and the Core Plug article better highlighted with use of the {See} template. No merge needed IMO - just a clean-up of both articles. Oosh (talk) 04:44, 19 January 2009 (UTC)
I agree with the merge, one article that discusses the two purposes of similar devices would be better than the current split. Midlandstoday (talk) 14:12, 5 August 2009 (UTC)

The above discussion is closed. Please do not modify it. Subsequent comments should be made in a new section.

Page needs work[edit]

The page needs a bit of work, as a core plug can be several things, such as the earth removed from a lawn when a lawn aerator is used, or a deep hole drilling sample taken when a hollow bit is used to drill into the earth, and other items. Technically the editor who created this article did not use an incorrect name, as what he is trying to describe is a combination of the process of making a core to support the water jacket of the internal combustion engine, how and why the hole is formed in the casting, and how and why the cored hole thus formed is closed over to maintain water-tightness in the engine block. The sketch below somewhat explains the steps by showing what would happen without the use of the cored hole in the casting process and the resultant hole produced by the core. In order to form the internal water jacket of the engine a core is used. The core is placed in the mold and the forces acting upon it are gravity and the bouyancy of the core itself. Gravity can be understood, although a countermeasure to this would be to use chaplets. Chaplets are often not permitted as a watertight connection cannot be maintained for various reasons. Therefore the cored hold first acts as a way to support the core in the proper position. When the molten metal fills the mold cavity the property of bouyancy must be considered according to Archimedes principle. Sand has a density of approximately 100 pounds per cubic foot, about 0.06 pounds per cubic inch. Iron has a density of about 0.25 pounds per cubic inch. Therefore when casting iron with sand, the sand core will be bouyant in the iron and will float. When the metal freezes the core could rise in the mold cavity and contact the upper surface. Sometimes in light metal the differential is not so great and the core will sink in the molten metal. This is especially true if the core is made hollow. In any case there can be holes formed in the sidewall, either by the use of small pin cores or a change in the shape of the core to add core prints. This supports the core into the proper position preventing gravity from lowering the core or bouyancy in the molten metal from 'floating' the core. After the metal freezes the casting is left with the cored holes. These holes are often machined to a precise diameter and then a thin sheet metal insert can be installed to maintain the water tightness.

In order to put a positive spin on this process using the required opening (the cored hole), the engine manufacturers called the sheet metal insert a freeze out plug to indicate there was a definite purpose for the hole in application as opposed to the use of the hole in the casting process. Often these sheet metal inserts will corrode preferentially to the block and leak.

Sorry about the sketch it is not too good for an article but here for example.

The list of core processes in the lower section of the article are probably not needed except as 'see also' should core articles be written. Mfields1 (talk) 23:56, 21 June 2009 (UTC)

Sketch of core support.jpg

The page is a mix up of vaguely related processes and terms. The core plugs and welch plugs need to be split off into their own desperate pages. The previous editor is correct about the term " core plug" being a generic description of many different types of processes. It includes drilling cores (in ice, earth, etc) , casting cores (when casting various molten metal alloys).
Welch plugs are not a sub section of core plugs in any way.. Welch plugs are used to block off openings made by [core plugs] or openings drilled or machined into cast or manufactured components.

Convex out[edit]

The correct orientation of a Welch plug is with the convex dome facing outwards, as is shown in the photo. In the correct orientation, a hammer blow will expand the plug so that it locks firmly in place and seals the hole. Installed backwards, the plug will not seat properly, and must rely solely on glue/sealant to hold it tenuously in place against internal pressure. Some mechanics may have been taught the wrong way based on received authority, and have never thought carefully about the physics of metal deformation involved in seating the plug securely. I have added a reference to the company that originally developed the Welch plug. The reference also shows a "cupped plug" design, which has a different design and is installed differently from a Welch plug. Reify-tech (talk) 05:19, 11 March 2015 (UTC)

External links modified[edit]

Hello fellow Wikipedians,

I have just modified one external link on Core plug. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

You may set the |checked=, on this template, to true or failed to let other editors know you reviewed the change. If you find any errors, please use the tools below to fix them or call an editor by setting |needhelp= to your help request.

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

If you are unable to use these tools, you may set |needhelp=<your help request> on this template to request help from an experienced user. Please include details about your problem, to help other editors.

Cheers.—InternetArchiveBot (Report bug) 03:22, 13 August 2017 (UTC)