Re: [CR]Forget Sugino Mity - Melt Forged ??


Example: Component Manufacturers:Avocet

Date: Sat, 13 Sep 2003 07:05:33 -0400
From: Joe Bender-Zanoni <joebz@optonline.net>
Subject: Re: [CR]Forget Sugino Mity - Melt Forged ??
To: Bainbridge <gotfleas@earthlink.net>, Donald Gillies <gillies@cs.ubc.ca>, classicrendezvous@bikelist.org
References: <BB945722.2A97%gotfleas@earthlink.net>


Great answer Bryant. I would add that cold forging is superior because it eliminates voids and provides better grain structure. High quality aircraft castings are typically rated 1/3 lower in strength than comparable forgings for structural analysis.

Joe B-Z
GNNJ


----- Original Message -----
From: "Bainbridge"
To: "Donald Gillies" ;
Sent: Monday, September 22, 2003 10:37 AM
Subject: Re: [CR]Forget Sugino Mity - Melt Forged ??



> Donald Gillies wrote:
>
> What is melt-forging and is it still used?
>
>
> Don,
>
> The "Mighty" series of cranks were cold forged. "Melt Forging" is actually a
> marketing name for high pressure casting. The alloy is forced into the mold
> under high pressure (over 10,000 psi) and then cooled quickly with a water
> jacket around the mold. The Hierarchy for crank manufacturing is: Cold
> Forged, Hot Forged, Gravity Cast, Melt Forged.
>
> What separates all these process is the amount of money needed for tooling &
> the time needed to complete a part. Cold forging requires the highest number
> of dies, Hot forging uses fewer and Gravity casting & melt forging only one
> mold but melt forging is quicker.
>
> Hope that helps.
>
> Bryant Bainbridge
> Portland Oregon