Casting process for producing hermetically sealed housings for hard disk drives
a technology of hard disk drives and casting processes, which is applied in the field of casting processes for producing hermetically sealed housings for hard disk drives, can solve the problems of limited reliability of these components produced in this manner, and limit their use in gas pressure tight applications, and achieve the effect of close dimensional tolerances
Inactive Publication Date: 2015-08-13
JORSTAD LLC
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Benefits of technology
This patent is about a method and device for making semi-solid castings, which are useful for making objects that need to be tightly sealed. These castings can be made without any tiny air bubbles, which can cause problems in some applications. The method requires a special type of aluminum powder that is very small and evenly distributed throughout the material. The process uses a special device that allows the aluminum to flow smoothly and evenly into the mold, resulting in very precise and thin objects. This method is better than traditional die casting and can be used to make many different types of castings.
Problems solved by technology
The reliability of these components produced in this manner can be limited.
The current processes when used to manufacture parts with relatively complex geometries generally yield components with shrink porosity and micro-porosity which limits their use in gas pressure tight applications.
Method used
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[0012]Referring to FIG. 2, an upper die or mold section 16 with ejector pins 21 is secured to the bottom of the adapter plate 17 which is attached to a vertical die casting hydraulic cylinder of a vertical die cast machine, as disclosed in U.S. Pat. No. 6,901,991 which issued to applicant, and the disclosure of which is herein incorporated by reference. A lower die or mold section 15 is attached to a gate plate 14 and is fixed to the lower platen of the vertical die cast machine. The gate plate 14 defines an offset funnel gate passage 19 that cooperates with the axially symmetric tapered nozzle opening 20 in the lower mold 15. The die cavity 18 defines the geometry of the cast housing 30 shown in FIG. 1. A shot sleeve 11 defines a cylindrical shot chamber which receives a corresponding shot piston 10. The shot piston 10 has a water cooled cavity 22 to control the shot piston temperature.
[0013]In operation of the vertical die cast machine according to the process disclosed in above m...
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Abstract
An aluminum alloy casting having a globular microstructure forms a housing for a hard disk drive by pouring a molten aluminum alloy with a fine grain and a non-dendritic structure into the shot chamber defined by a shot sleeve of a vertical die cast press. Heat is removed from the molten alloy to produce a semi-solid slurry which is forced upwardly into a die cavity through an offset elongated funnel gate opening positioned to received and merge hotter slurry within the center portion of the shot chamber with cooler slurry adjacent the shot sleeve. The solidified alloy forms a housing that has a gas leak rate that meets the requirements of being hermetically sealed.
Description
RELATED APPLICATION[0001]This application claims the benefit of Provisional Patent Application Ser. No. 61 / 838,512, filed Jun. 24, 2013.BACKGROUND OF THE INVENTION[0002]Aluminum alloy components such as the base housing of a hermetically sealed hard disk drive require gas pressure tightness. The aluminum alloy components are commonly cast using a conventional high pressure die casting process that results in porous castings. These castings then require a sealant impregnation process to seal them for gas pressure tightness. The reliability of these components produced in this manner can be limited. The current processes when used to manufacture parts with relatively complex geometries generally yield components with shrink porosity and micro-porosity which limits their use in gas pressure tight applications. Hermetically sealed Hard Disk Drives (HDD) charged with helium are required for the next generation of data recording technology. They are necessary for future increases in track...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B22D17/12B22D21/04B22D17/22C22C21/00B22D17/20
CPCB22D17/12C22C21/00B22D17/203B22D21/04B22D17/2038B22D17/22B22D17/2023B22D17/007
InventorKAMM, RICHARD J.THIEMAN, MICHAEL W.
OwnerJORSTAD LLC